a1b547f0f2
-----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEE8rQSAMVO+zA4DBdWxWXV+ddtWDsFAmaVN3MACgkQxWXV+ddt WDtpIRAAl+1NjsEj8e5V/UYn8Jr06ujTOnrkR3PCTICxDHbUaMLkQEw21H0K/ogQ 3fOiEVpSlZOfKdYXtXaMQbC0jd/Af2eA10Uht96nAEjAtxu1uJ4cFZGu2meNdXZP xUioivJ/CElMPH2aluG6FaQvUTqmhrEr8tSoYbxzQmUd434q9kqqyjtw1tfzYDG1 VDn2f7ykhpB/8P0aoqgWSshWTmaCzG0GkuI28o1o0iZUIF/P9TKdzxlLRW6BVHE7 T2oGLEQjN1GQbCH75L4IeNJDkCBVfcDcbZkUDJ/ae4Pt/jJQTFY53YIP9wXFZQnd mdfHmK7Atpsk75ATftYSq+ENkbQ5fsuut5CD63u54gAqA4M1FncDXTAWS1Y30F76 P8juSCmsSy0o3gTflDIo/IMdntoh/JmncwwStF6oKzmyUZZzzarsqM8mc1P03ZNt 3ttlnbY7lC1TDAlD5J2wXE0INCT2pN+4C9IToWdRypeuLu6qrI7cQ0oylyp9OVQM t9umTXm0B6s1cyqEDjJf0xJZS/JTHYwu7S4EmAJwicgiLpOjABVTmO8021rVmDJy TAUu6yEhSsrTT6Dxm7/2Et1EEOKFF5hhsG1SiGD9oUIZK6B5+0waT+rbkEWl7osR 4/TAv2zX6tuCc7HIW0fQloM/6/Gyd5wcDVaQNDUzFA075uKstwY= =k5d3 -----END PGP SIGNATURE----- Merge tag 'for-6.11-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux Pull btrfs updates from David Sterba: "The highlights are new logic behind background block group reclaim, automatic removal of qgroup after removing a subvolume and new 'rescue=' mount options. The rest is optimizations, cleanups and refactoring. User visible features: - dynamic block group reclaim: - tunable framework to avoid situations where eager data allocations prevent creating new metadata chunks due to lack of unallocated space - reuse sysfs knob bg_reclaim_threshold (otherwise used only in zoned mode) for a fixed value threshold - new on/off sysfs knob "dynamic_reclaim" calculating the value based on heuristics, aiming to keep spare working space for relocating chunks but not to needlessly relocate partially utilized block groups or reclaim newly allocated ones - stats are exported in sysfs per block group type, files "reclaim_*" - this may increase IO load at unexpected times but the corner case of no allocatable block groups is known to be worse - automatically remove qgroup of deleted subvolumes: - adjust qgroup removal conditions, make sure all related subvolume data are already removed, or return EBUSY, also take into account setting of sysfs drop_subtree_threshold - also works in squota mode - mount option updates: new modes of 'rescue=' that allow to mount images (read-only) that could have been partially converted by user space tools - ignoremetacsums - invalid metadata checksums are ignored - ignoresuperflags - super block flags that track conversion in progress (like UUID or checksums) Core: - size of struct btrfs_inode is now below 1024 (on a release config), improved memory packing and other secondary effects - switch tracking of open inodes from rb-tree to xarray, minor performance improvement - reduce number of empty transaction commits when there are no dirty data/metadata - memory allocation optimizations (reduced numbers, reordering out of critical sections) - extent map structure optimizations and refactoring, more sanity checks - more subpage in zoned mode preparations or fixes - general snapshot code cleanups, improvements and documentation - tree-checker updates: more file extent ram_bytes fixes, continued - raid-stripe-tree update (not backward compatible): - remove extent encoding field from the structure, can be inferred from other information - requires btrfs-progs 6.9.1 or newer - cleanups and refactoring - error message updates - error handling improvements - return type and parameter cleanups and improvements" * tag 'for-6.11-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: (152 commits) btrfs: fix extent map use-after-free when adding pages to compressed bio btrfs: fix bitmap leak when loading free space cache on duplicate entry btrfs: remove the BUG_ON() inside extent_range_clear_dirty_for_io() btrfs: move extent_range_clear_dirty_for_io() into inode.c btrfs: enhance compression error messages btrfs: fix data race when accessing the last_trans field of a root btrfs: rename the extra_gfp parameter of btrfs_alloc_page_array() btrfs: remove the extra_gfp parameter from btrfs_alloc_folio_array() btrfs: introduce new "rescue=ignoresuperflags" mount option btrfs: introduce new "rescue=ignoremetacsums" mount option btrfs: output the unrecognized super block flags as hex btrfs: remove unused Opt enums btrfs: tree-checker: add extra ram_bytes and disk_num_bytes check btrfs: fix the ram_bytes assignment for truncated ordered extents btrfs: make validate_extent_map() catch ram_bytes mismatch btrfs: ignore incorrect btrfs_file_extent_item::ram_bytes btrfs: cleanup the bytenr usage inside btrfs_extent_item_to_extent_map() btrfs: fix typo in error message in btrfs_validate_super() btrfs: move the direct IO code into its own file btrfs: pass a btrfs_inode to btrfs_set_prop() ...
4952 lines
139 KiB
C
4952 lines
139 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*/
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#include <linux/fs.h>
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#include <linux/blkdev.h>
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#include <linux/radix-tree.h>
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#include <linux/writeback.h>
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#include <linux/workqueue.h>
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#include <linux/kthread.h>
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#include <linux/slab.h>
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#include <linux/migrate.h>
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#include <linux/ratelimit.h>
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#include <linux/uuid.h>
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#include <linux/semaphore.h>
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#include <linux/error-injection.h>
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#include <linux/crc32c.h>
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#include <linux/sched/mm.h>
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#include <asm/unaligned.h>
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#include <crypto/hash.h>
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#include "ctree.h"
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#include "disk-io.h"
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#include "transaction.h"
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#include "btrfs_inode.h"
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#include "bio.h"
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#include "print-tree.h"
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#include "locking.h"
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#include "tree-log.h"
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#include "free-space-cache.h"
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#include "free-space-tree.h"
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#include "dev-replace.h"
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#include "raid56.h"
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#include "sysfs.h"
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#include "qgroup.h"
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#include "compression.h"
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#include "tree-checker.h"
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#include "ref-verify.h"
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#include "block-group.h"
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#include "discard.h"
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#include "space-info.h"
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#include "zoned.h"
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#include "subpage.h"
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#include "fs.h"
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#include "accessors.h"
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#include "extent-tree.h"
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#include "root-tree.h"
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#include "defrag.h"
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#include "uuid-tree.h"
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#include "relocation.h"
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#include "scrub.h"
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#include "super.h"
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#define BTRFS_SUPER_FLAG_SUPP (BTRFS_HEADER_FLAG_WRITTEN |\
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BTRFS_HEADER_FLAG_RELOC |\
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BTRFS_SUPER_FLAG_ERROR |\
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BTRFS_SUPER_FLAG_SEEDING |\
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BTRFS_SUPER_FLAG_METADUMP |\
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BTRFS_SUPER_FLAG_METADUMP_V2)
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static int btrfs_cleanup_transaction(struct btrfs_fs_info *fs_info);
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static void btrfs_error_commit_super(struct btrfs_fs_info *fs_info);
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static void btrfs_free_csum_hash(struct btrfs_fs_info *fs_info)
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{
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if (fs_info->csum_shash)
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crypto_free_shash(fs_info->csum_shash);
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}
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/*
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* Compute the csum of a btree block and store the result to provided buffer.
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*/
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static void csum_tree_block(struct extent_buffer *buf, u8 *result)
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{
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struct btrfs_fs_info *fs_info = buf->fs_info;
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int num_pages;
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u32 first_page_part;
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SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
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char *kaddr;
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int i;
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shash->tfm = fs_info->csum_shash;
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crypto_shash_init(shash);
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if (buf->addr) {
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/* Pages are contiguous, handle them as a big one. */
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kaddr = buf->addr;
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first_page_part = fs_info->nodesize;
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num_pages = 1;
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} else {
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kaddr = folio_address(buf->folios[0]);
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first_page_part = min_t(u32, PAGE_SIZE, fs_info->nodesize);
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num_pages = num_extent_pages(buf);
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}
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crypto_shash_update(shash, kaddr + BTRFS_CSUM_SIZE,
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first_page_part - BTRFS_CSUM_SIZE);
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/*
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* Multiple single-page folios case would reach here.
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*
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* nodesize <= PAGE_SIZE and large folio all handled by above
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* crypto_shash_update() already.
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*/
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for (i = 1; i < num_pages && INLINE_EXTENT_BUFFER_PAGES > 1; i++) {
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kaddr = folio_address(buf->folios[i]);
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crypto_shash_update(shash, kaddr, PAGE_SIZE);
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}
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memset(result, 0, BTRFS_CSUM_SIZE);
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crypto_shash_final(shash, result);
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}
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/*
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* we can't consider a given block up to date unless the transid of the
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* block matches the transid in the parent node's pointer. This is how we
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* detect blocks that either didn't get written at all or got written
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* in the wrong place.
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*/
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int btrfs_buffer_uptodate(struct extent_buffer *eb, u64 parent_transid, int atomic)
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{
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if (!extent_buffer_uptodate(eb))
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return 0;
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if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
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return 1;
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if (atomic)
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return -EAGAIN;
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if (!extent_buffer_uptodate(eb) ||
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btrfs_header_generation(eb) != parent_transid) {
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btrfs_err_rl(eb->fs_info,
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"parent transid verify failed on logical %llu mirror %u wanted %llu found %llu",
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eb->start, eb->read_mirror,
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parent_transid, btrfs_header_generation(eb));
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clear_extent_buffer_uptodate(eb);
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return 0;
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}
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return 1;
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}
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static bool btrfs_supported_super_csum(u16 csum_type)
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{
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switch (csum_type) {
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case BTRFS_CSUM_TYPE_CRC32:
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case BTRFS_CSUM_TYPE_XXHASH:
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case BTRFS_CSUM_TYPE_SHA256:
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case BTRFS_CSUM_TYPE_BLAKE2:
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return true;
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default:
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return false;
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}
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}
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/*
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* Return 0 if the superblock checksum type matches the checksum value of that
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* algorithm. Pass the raw disk superblock data.
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*/
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int btrfs_check_super_csum(struct btrfs_fs_info *fs_info,
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const struct btrfs_super_block *disk_sb)
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{
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char result[BTRFS_CSUM_SIZE];
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SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
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shash->tfm = fs_info->csum_shash;
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/*
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* The super_block structure does not span the whole
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* BTRFS_SUPER_INFO_SIZE range, we expect that the unused space is
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* filled with zeros and is included in the checksum.
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*/
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crypto_shash_digest(shash, (const u8 *)disk_sb + BTRFS_CSUM_SIZE,
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BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE, result);
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if (memcmp(disk_sb->csum, result, fs_info->csum_size))
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return 1;
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return 0;
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}
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static int btrfs_repair_eb_io_failure(const struct extent_buffer *eb,
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int mirror_num)
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{
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struct btrfs_fs_info *fs_info = eb->fs_info;
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int num_folios = num_extent_folios(eb);
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int ret = 0;
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if (sb_rdonly(fs_info->sb))
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return -EROFS;
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for (int i = 0; i < num_folios; i++) {
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struct folio *folio = eb->folios[i];
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u64 start = max_t(u64, eb->start, folio_pos(folio));
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u64 end = min_t(u64, eb->start + eb->len,
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folio_pos(folio) + eb->folio_size);
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u32 len = end - start;
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ret = btrfs_repair_io_failure(fs_info, 0, start, len,
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start, folio, offset_in_folio(folio, start),
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mirror_num);
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if (ret)
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break;
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}
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return ret;
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}
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/*
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* helper to read a given tree block, doing retries as required when
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* the checksums don't match and we have alternate mirrors to try.
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*
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* @check: expected tree parentness check, see the comments of the
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* structure for details.
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*/
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int btrfs_read_extent_buffer(struct extent_buffer *eb,
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const struct btrfs_tree_parent_check *check)
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{
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struct btrfs_fs_info *fs_info = eb->fs_info;
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int failed = 0;
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int ret;
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int num_copies = 0;
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int mirror_num = 0;
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int failed_mirror = 0;
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ASSERT(check);
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while (1) {
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clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
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ret = read_extent_buffer_pages(eb, WAIT_COMPLETE, mirror_num, check);
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if (!ret)
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break;
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num_copies = btrfs_num_copies(fs_info,
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eb->start, eb->len);
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if (num_copies == 1)
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break;
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if (!failed_mirror) {
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failed = 1;
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failed_mirror = eb->read_mirror;
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}
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mirror_num++;
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if (mirror_num == failed_mirror)
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mirror_num++;
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if (mirror_num > num_copies)
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break;
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}
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if (failed && !ret && failed_mirror)
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btrfs_repair_eb_io_failure(eb, failed_mirror);
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return ret;
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}
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/*
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* Checksum a dirty tree block before IO.
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*/
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blk_status_t btree_csum_one_bio(struct btrfs_bio *bbio)
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{
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struct extent_buffer *eb = bbio->private;
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struct btrfs_fs_info *fs_info = eb->fs_info;
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u64 found_start = btrfs_header_bytenr(eb);
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u64 last_trans;
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u8 result[BTRFS_CSUM_SIZE];
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int ret;
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/* Btree blocks are always contiguous on disk. */
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if (WARN_ON_ONCE(bbio->file_offset != eb->start))
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return BLK_STS_IOERR;
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if (WARN_ON_ONCE(bbio->bio.bi_iter.bi_size != eb->len))
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return BLK_STS_IOERR;
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/*
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* If an extent_buffer is marked as EXTENT_BUFFER_ZONED_ZEROOUT, don't
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* checksum it but zero-out its content. This is done to preserve
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* ordering of I/O without unnecessarily writing out data.
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*/
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if (test_bit(EXTENT_BUFFER_ZONED_ZEROOUT, &eb->bflags)) {
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memzero_extent_buffer(eb, 0, eb->len);
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return BLK_STS_OK;
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}
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if (WARN_ON_ONCE(found_start != eb->start))
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return BLK_STS_IOERR;
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if (WARN_ON(!btrfs_folio_test_uptodate(fs_info, eb->folios[0],
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eb->start, eb->len)))
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return BLK_STS_IOERR;
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ASSERT(memcmp_extent_buffer(eb, fs_info->fs_devices->metadata_uuid,
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offsetof(struct btrfs_header, fsid),
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BTRFS_FSID_SIZE) == 0);
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csum_tree_block(eb, result);
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if (btrfs_header_level(eb))
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ret = btrfs_check_node(eb);
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else
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ret = btrfs_check_leaf(eb);
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if (ret < 0)
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goto error;
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/*
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* Also check the generation, the eb reached here must be newer than
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* last committed. Or something seriously wrong happened.
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*/
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last_trans = btrfs_get_last_trans_committed(fs_info);
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if (unlikely(btrfs_header_generation(eb) <= last_trans)) {
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ret = -EUCLEAN;
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btrfs_err(fs_info,
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"block=%llu bad generation, have %llu expect > %llu",
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eb->start, btrfs_header_generation(eb), last_trans);
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goto error;
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}
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write_extent_buffer(eb, result, 0, fs_info->csum_size);
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return BLK_STS_OK;
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error:
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btrfs_print_tree(eb, 0);
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btrfs_err(fs_info, "block=%llu write time tree block corruption detected",
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eb->start);
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/*
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* Be noisy if this is an extent buffer from a log tree. We don't abort
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* a transaction in case there's a bad log tree extent buffer, we just
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* fallback to a transaction commit. Still we want to know when there is
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* a bad log tree extent buffer, as that may signal a bug somewhere.
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*/
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WARN_ON(IS_ENABLED(CONFIG_BTRFS_DEBUG) ||
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btrfs_header_owner(eb) == BTRFS_TREE_LOG_OBJECTID);
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return errno_to_blk_status(ret);
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}
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static bool check_tree_block_fsid(struct extent_buffer *eb)
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{
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struct btrfs_fs_info *fs_info = eb->fs_info;
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struct btrfs_fs_devices *fs_devices = fs_info->fs_devices, *seed_devs;
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u8 fsid[BTRFS_FSID_SIZE];
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read_extent_buffer(eb, fsid, offsetof(struct btrfs_header, fsid),
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BTRFS_FSID_SIZE);
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/*
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* alloc_fsid_devices() copies the fsid into fs_devices::metadata_uuid.
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* This is then overwritten by metadata_uuid if it is present in the
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* device_list_add(). The same true for a seed device as well. So use of
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* fs_devices::metadata_uuid is appropriate here.
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*/
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if (memcmp(fsid, fs_info->fs_devices->metadata_uuid, BTRFS_FSID_SIZE) == 0)
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return false;
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list_for_each_entry(seed_devs, &fs_devices->seed_list, seed_list)
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if (!memcmp(fsid, seed_devs->fsid, BTRFS_FSID_SIZE))
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return false;
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return true;
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}
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/* Do basic extent buffer checks at read time */
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int btrfs_validate_extent_buffer(struct extent_buffer *eb,
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const struct btrfs_tree_parent_check *check)
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{
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struct btrfs_fs_info *fs_info = eb->fs_info;
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u64 found_start;
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const u32 csum_size = fs_info->csum_size;
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u8 found_level;
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u8 result[BTRFS_CSUM_SIZE];
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const u8 *header_csum;
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int ret = 0;
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const bool ignore_csum = btrfs_test_opt(fs_info, IGNOREMETACSUMS);
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ASSERT(check);
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found_start = btrfs_header_bytenr(eb);
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if (found_start != eb->start) {
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btrfs_err_rl(fs_info,
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"bad tree block start, mirror %u want %llu have %llu",
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eb->read_mirror, eb->start, found_start);
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ret = -EIO;
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goto out;
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}
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if (check_tree_block_fsid(eb)) {
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btrfs_err_rl(fs_info, "bad fsid on logical %llu mirror %u",
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eb->start, eb->read_mirror);
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ret = -EIO;
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goto out;
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}
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found_level = btrfs_header_level(eb);
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if (found_level >= BTRFS_MAX_LEVEL) {
|
|
btrfs_err(fs_info,
|
|
"bad tree block level, mirror %u level %d on logical %llu",
|
|
eb->read_mirror, btrfs_header_level(eb), eb->start);
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
csum_tree_block(eb, result);
|
|
header_csum = folio_address(eb->folios[0]) +
|
|
get_eb_offset_in_folio(eb, offsetof(struct btrfs_header, csum));
|
|
|
|
if (memcmp(result, header_csum, csum_size) != 0) {
|
|
btrfs_warn_rl(fs_info,
|
|
"checksum verify failed on logical %llu mirror %u wanted " CSUM_FMT " found " CSUM_FMT " level %d%s",
|
|
eb->start, eb->read_mirror,
|
|
CSUM_FMT_VALUE(csum_size, header_csum),
|
|
CSUM_FMT_VALUE(csum_size, result),
|
|
btrfs_header_level(eb),
|
|
ignore_csum ? ", ignored" : "");
|
|
if (!ignore_csum) {
|
|
ret = -EUCLEAN;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (found_level != check->level) {
|
|
btrfs_err(fs_info,
|
|
"level verify failed on logical %llu mirror %u wanted %u found %u",
|
|
eb->start, eb->read_mirror, check->level, found_level);
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
if (unlikely(check->transid &&
|
|
btrfs_header_generation(eb) != check->transid)) {
|
|
btrfs_err_rl(eb->fs_info,
|
|
"parent transid verify failed on logical %llu mirror %u wanted %llu found %llu",
|
|
eb->start, eb->read_mirror, check->transid,
|
|
btrfs_header_generation(eb));
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
if (check->has_first_key) {
|
|
const struct btrfs_key *expect_key = &check->first_key;
|
|
struct btrfs_key found_key;
|
|
|
|
if (found_level)
|
|
btrfs_node_key_to_cpu(eb, &found_key, 0);
|
|
else
|
|
btrfs_item_key_to_cpu(eb, &found_key, 0);
|
|
if (unlikely(btrfs_comp_cpu_keys(expect_key, &found_key))) {
|
|
btrfs_err(fs_info,
|
|
"tree first key mismatch detected, bytenr=%llu parent_transid=%llu key expected=(%llu,%u,%llu) has=(%llu,%u,%llu)",
|
|
eb->start, check->transid,
|
|
expect_key->objectid,
|
|
expect_key->type, expect_key->offset,
|
|
found_key.objectid, found_key.type,
|
|
found_key.offset);
|
|
ret = -EUCLEAN;
|
|
goto out;
|
|
}
|
|
}
|
|
if (check->owner_root) {
|
|
ret = btrfs_check_eb_owner(eb, check->owner_root);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* If this is a leaf block and it is corrupt, set the corrupt bit so
|
|
* that we don't try and read the other copies of this block, just
|
|
* return -EIO.
|
|
*/
|
|
if (found_level == 0 && btrfs_check_leaf(eb)) {
|
|
set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
|
|
ret = -EIO;
|
|
}
|
|
|
|
if (found_level > 0 && btrfs_check_node(eb))
|
|
ret = -EIO;
|
|
|
|
if (ret)
|
|
btrfs_err(fs_info,
|
|
"read time tree block corruption detected on logical %llu mirror %u",
|
|
eb->start, eb->read_mirror);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_MIGRATION
|
|
static int btree_migrate_folio(struct address_space *mapping,
|
|
struct folio *dst, struct folio *src, enum migrate_mode mode)
|
|
{
|
|
/*
|
|
* we can't safely write a btree page from here,
|
|
* we haven't done the locking hook
|
|
*/
|
|
if (folio_test_dirty(src))
|
|
return -EAGAIN;
|
|
/*
|
|
* Buffers may be managed in a filesystem specific way.
|
|
* We must have no buffers or drop them.
|
|
*/
|
|
if (folio_get_private(src) &&
|
|
!filemap_release_folio(src, GFP_KERNEL))
|
|
return -EAGAIN;
|
|
return migrate_folio(mapping, dst, src, mode);
|
|
}
|
|
#else
|
|
#define btree_migrate_folio NULL
|
|
#endif
|
|
|
|
static int btree_writepages(struct address_space *mapping,
|
|
struct writeback_control *wbc)
|
|
{
|
|
int ret;
|
|
|
|
if (wbc->sync_mode == WB_SYNC_NONE) {
|
|
struct btrfs_fs_info *fs_info;
|
|
|
|
if (wbc->for_kupdate)
|
|
return 0;
|
|
|
|
fs_info = inode_to_fs_info(mapping->host);
|
|
/* this is a bit racy, but that's ok */
|
|
ret = __percpu_counter_compare(&fs_info->dirty_metadata_bytes,
|
|
BTRFS_DIRTY_METADATA_THRESH,
|
|
fs_info->dirty_metadata_batch);
|
|
if (ret < 0)
|
|
return 0;
|
|
}
|
|
return btree_write_cache_pages(mapping, wbc);
|
|
}
|
|
|
|
static bool btree_release_folio(struct folio *folio, gfp_t gfp_flags)
|
|
{
|
|
if (folio_test_writeback(folio) || folio_test_dirty(folio))
|
|
return false;
|
|
|
|
return try_release_extent_buffer(&folio->page);
|
|
}
|
|
|
|
static void btree_invalidate_folio(struct folio *folio, size_t offset,
|
|
size_t length)
|
|
{
|
|
struct extent_io_tree *tree;
|
|
|
|
tree = &folio_to_inode(folio)->io_tree;
|
|
extent_invalidate_folio(tree, folio, offset);
|
|
btree_release_folio(folio, GFP_NOFS);
|
|
if (folio_get_private(folio)) {
|
|
btrfs_warn(folio_to_fs_info(folio),
|
|
"folio private not zero on folio %llu",
|
|
(unsigned long long)folio_pos(folio));
|
|
folio_detach_private(folio);
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
static bool btree_dirty_folio(struct address_space *mapping,
|
|
struct folio *folio)
|
|
{
|
|
struct btrfs_fs_info *fs_info = inode_to_fs_info(mapping->host);
|
|
struct btrfs_subpage_info *spi = fs_info->subpage_info;
|
|
struct btrfs_subpage *subpage;
|
|
struct extent_buffer *eb;
|
|
int cur_bit = 0;
|
|
u64 page_start = folio_pos(folio);
|
|
|
|
if (fs_info->sectorsize == PAGE_SIZE) {
|
|
eb = folio_get_private(folio);
|
|
BUG_ON(!eb);
|
|
BUG_ON(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
|
|
BUG_ON(!atomic_read(&eb->refs));
|
|
btrfs_assert_tree_write_locked(eb);
|
|
return filemap_dirty_folio(mapping, folio);
|
|
}
|
|
|
|
ASSERT(spi);
|
|
subpage = folio_get_private(folio);
|
|
|
|
for (cur_bit = spi->dirty_offset;
|
|
cur_bit < spi->dirty_offset + spi->bitmap_nr_bits;
|
|
cur_bit++) {
|
|
unsigned long flags;
|
|
u64 cur;
|
|
|
|
spin_lock_irqsave(&subpage->lock, flags);
|
|
if (!test_bit(cur_bit, subpage->bitmaps)) {
|
|
spin_unlock_irqrestore(&subpage->lock, flags);
|
|
continue;
|
|
}
|
|
spin_unlock_irqrestore(&subpage->lock, flags);
|
|
cur = page_start + cur_bit * fs_info->sectorsize;
|
|
|
|
eb = find_extent_buffer(fs_info, cur);
|
|
ASSERT(eb);
|
|
ASSERT(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
|
|
ASSERT(atomic_read(&eb->refs));
|
|
btrfs_assert_tree_write_locked(eb);
|
|
free_extent_buffer(eb);
|
|
|
|
cur_bit += (fs_info->nodesize >> fs_info->sectorsize_bits) - 1;
|
|
}
|
|
return filemap_dirty_folio(mapping, folio);
|
|
}
|
|
#else
|
|
#define btree_dirty_folio filemap_dirty_folio
|
|
#endif
|
|
|
|
static const struct address_space_operations btree_aops = {
|
|
.writepages = btree_writepages,
|
|
.release_folio = btree_release_folio,
|
|
.invalidate_folio = btree_invalidate_folio,
|
|
.migrate_folio = btree_migrate_folio,
|
|
.dirty_folio = btree_dirty_folio,
|
|
};
|
|
|
|
struct extent_buffer *btrfs_find_create_tree_block(
|
|
struct btrfs_fs_info *fs_info,
|
|
u64 bytenr, u64 owner_root,
|
|
int level)
|
|
{
|
|
if (btrfs_is_testing(fs_info))
|
|
return alloc_test_extent_buffer(fs_info, bytenr);
|
|
return alloc_extent_buffer(fs_info, bytenr, owner_root, level);
|
|
}
|
|
|
|
/*
|
|
* Read tree block at logical address @bytenr and do variant basic but critical
|
|
* verification.
|
|
*
|
|
* @check: expected tree parentness check, see comments of the
|
|
* structure for details.
|
|
*/
|
|
struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
|
|
struct btrfs_tree_parent_check *check)
|
|
{
|
|
struct extent_buffer *buf = NULL;
|
|
int ret;
|
|
|
|
ASSERT(check);
|
|
|
|
buf = btrfs_find_create_tree_block(fs_info, bytenr, check->owner_root,
|
|
check->level);
|
|
if (IS_ERR(buf))
|
|
return buf;
|
|
|
|
ret = btrfs_read_extent_buffer(buf, check);
|
|
if (ret) {
|
|
free_extent_buffer_stale(buf);
|
|
return ERR_PTR(ret);
|
|
}
|
|
return buf;
|
|
|
|
}
|
|
|
|
static void __setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
|
|
u64 objectid)
|
|
{
|
|
bool dummy = btrfs_is_testing(fs_info);
|
|
|
|
memset(&root->root_key, 0, sizeof(root->root_key));
|
|
memset(&root->root_item, 0, sizeof(root->root_item));
|
|
memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
|
|
root->fs_info = fs_info;
|
|
root->root_key.objectid = objectid;
|
|
root->node = NULL;
|
|
root->commit_root = NULL;
|
|
root->state = 0;
|
|
RB_CLEAR_NODE(&root->rb_node);
|
|
|
|
btrfs_set_root_last_trans(root, 0);
|
|
root->free_objectid = 0;
|
|
root->nr_delalloc_inodes = 0;
|
|
root->nr_ordered_extents = 0;
|
|
xa_init(&root->inodes);
|
|
xa_init(&root->delayed_nodes);
|
|
|
|
btrfs_init_root_block_rsv(root);
|
|
|
|
INIT_LIST_HEAD(&root->dirty_list);
|
|
INIT_LIST_HEAD(&root->root_list);
|
|
INIT_LIST_HEAD(&root->delalloc_inodes);
|
|
INIT_LIST_HEAD(&root->delalloc_root);
|
|
INIT_LIST_HEAD(&root->ordered_extents);
|
|
INIT_LIST_HEAD(&root->ordered_root);
|
|
INIT_LIST_HEAD(&root->reloc_dirty_list);
|
|
spin_lock_init(&root->delalloc_lock);
|
|
spin_lock_init(&root->ordered_extent_lock);
|
|
spin_lock_init(&root->accounting_lock);
|
|
spin_lock_init(&root->qgroup_meta_rsv_lock);
|
|
mutex_init(&root->objectid_mutex);
|
|
mutex_init(&root->log_mutex);
|
|
mutex_init(&root->ordered_extent_mutex);
|
|
mutex_init(&root->delalloc_mutex);
|
|
init_waitqueue_head(&root->qgroup_flush_wait);
|
|
init_waitqueue_head(&root->log_writer_wait);
|
|
init_waitqueue_head(&root->log_commit_wait[0]);
|
|
init_waitqueue_head(&root->log_commit_wait[1]);
|
|
INIT_LIST_HEAD(&root->log_ctxs[0]);
|
|
INIT_LIST_HEAD(&root->log_ctxs[1]);
|
|
atomic_set(&root->log_commit[0], 0);
|
|
atomic_set(&root->log_commit[1], 0);
|
|
atomic_set(&root->log_writers, 0);
|
|
atomic_set(&root->log_batch, 0);
|
|
refcount_set(&root->refs, 1);
|
|
atomic_set(&root->snapshot_force_cow, 0);
|
|
atomic_set(&root->nr_swapfiles, 0);
|
|
btrfs_set_root_log_transid(root, 0);
|
|
root->log_transid_committed = -1;
|
|
btrfs_set_root_last_log_commit(root, 0);
|
|
root->anon_dev = 0;
|
|
if (!dummy) {
|
|
extent_io_tree_init(fs_info, &root->dirty_log_pages,
|
|
IO_TREE_ROOT_DIRTY_LOG_PAGES);
|
|
extent_io_tree_init(fs_info, &root->log_csum_range,
|
|
IO_TREE_LOG_CSUM_RANGE);
|
|
}
|
|
|
|
spin_lock_init(&root->root_item_lock);
|
|
btrfs_qgroup_init_swapped_blocks(&root->swapped_blocks);
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
INIT_LIST_HEAD(&root->leak_list);
|
|
spin_lock(&fs_info->fs_roots_radix_lock);
|
|
list_add_tail(&root->leak_list, &fs_info->allocated_roots);
|
|
spin_unlock(&fs_info->fs_roots_radix_lock);
|
|
#endif
|
|
}
|
|
|
|
static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info,
|
|
u64 objectid, gfp_t flags)
|
|
{
|
|
struct btrfs_root *root = kzalloc(sizeof(*root), flags);
|
|
if (root)
|
|
__setup_root(root, fs_info, objectid);
|
|
return root;
|
|
}
|
|
|
|
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
|
|
/* Should only be used by the testing infrastructure */
|
|
struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *root;
|
|
|
|
if (!fs_info)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
root = btrfs_alloc_root(fs_info, BTRFS_ROOT_TREE_OBJECTID, GFP_KERNEL);
|
|
if (!root)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
/* We don't use the stripesize in selftest, set it as sectorsize */
|
|
root->alloc_bytenr = 0;
|
|
|
|
return root;
|
|
}
|
|
#endif
|
|
|
|
static int global_root_cmp(struct rb_node *a_node, const struct rb_node *b_node)
|
|
{
|
|
const struct btrfs_root *a = rb_entry(a_node, struct btrfs_root, rb_node);
|
|
const struct btrfs_root *b = rb_entry(b_node, struct btrfs_root, rb_node);
|
|
|
|
return btrfs_comp_cpu_keys(&a->root_key, &b->root_key);
|
|
}
|
|
|
|
static int global_root_key_cmp(const void *k, const struct rb_node *node)
|
|
{
|
|
const struct btrfs_key *key = k;
|
|
const struct btrfs_root *root = rb_entry(node, struct btrfs_root, rb_node);
|
|
|
|
return btrfs_comp_cpu_keys(key, &root->root_key);
|
|
}
|
|
|
|
int btrfs_global_root_insert(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct rb_node *tmp;
|
|
int ret = 0;
|
|
|
|
write_lock(&fs_info->global_root_lock);
|
|
tmp = rb_find_add(&root->rb_node, &fs_info->global_root_tree, global_root_cmp);
|
|
write_unlock(&fs_info->global_root_lock);
|
|
|
|
if (tmp) {
|
|
ret = -EEXIST;
|
|
btrfs_warn(fs_info, "global root %llu %llu already exists",
|
|
btrfs_root_id(root), root->root_key.offset);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
void btrfs_global_root_delete(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
|
|
write_lock(&fs_info->global_root_lock);
|
|
rb_erase(&root->rb_node, &fs_info->global_root_tree);
|
|
write_unlock(&fs_info->global_root_lock);
|
|
}
|
|
|
|
struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_key *key)
|
|
{
|
|
struct rb_node *node;
|
|
struct btrfs_root *root = NULL;
|
|
|
|
read_lock(&fs_info->global_root_lock);
|
|
node = rb_find(key, &fs_info->global_root_tree, global_root_key_cmp);
|
|
if (node)
|
|
root = container_of(node, struct btrfs_root, rb_node);
|
|
read_unlock(&fs_info->global_root_lock);
|
|
|
|
return root;
|
|
}
|
|
|
|
static u64 btrfs_global_root_id(struct btrfs_fs_info *fs_info, u64 bytenr)
|
|
{
|
|
struct btrfs_block_group *block_group;
|
|
u64 ret;
|
|
|
|
if (!btrfs_fs_incompat(fs_info, EXTENT_TREE_V2))
|
|
return 0;
|
|
|
|
if (bytenr)
|
|
block_group = btrfs_lookup_block_group(fs_info, bytenr);
|
|
else
|
|
block_group = btrfs_lookup_first_block_group(fs_info, bytenr);
|
|
ASSERT(block_group);
|
|
if (!block_group)
|
|
return 0;
|
|
ret = block_group->global_root_id;
|
|
btrfs_put_block_group(block_group);
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr)
|
|
{
|
|
struct btrfs_key key = {
|
|
.objectid = BTRFS_CSUM_TREE_OBJECTID,
|
|
.type = BTRFS_ROOT_ITEM_KEY,
|
|
.offset = btrfs_global_root_id(fs_info, bytenr),
|
|
};
|
|
|
|
return btrfs_global_root(fs_info, &key);
|
|
}
|
|
|
|
struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr)
|
|
{
|
|
struct btrfs_key key = {
|
|
.objectid = BTRFS_EXTENT_TREE_OBJECTID,
|
|
.type = BTRFS_ROOT_ITEM_KEY,
|
|
.offset = btrfs_global_root_id(fs_info, bytenr),
|
|
};
|
|
|
|
return btrfs_global_root(fs_info, &key);
|
|
}
|
|
|
|
struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
|
|
u64 objectid)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_root *tree_root = fs_info->tree_root;
|
|
struct btrfs_root *root;
|
|
struct btrfs_key key;
|
|
unsigned int nofs_flag;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* We're holding a transaction handle, so use a NOFS memory allocation
|
|
* context to avoid deadlock if reclaim happens.
|
|
*/
|
|
nofs_flag = memalloc_nofs_save();
|
|
root = btrfs_alloc_root(fs_info, objectid, GFP_KERNEL);
|
|
memalloc_nofs_restore(nofs_flag);
|
|
if (!root)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
root->root_key.objectid = objectid;
|
|
root->root_key.type = BTRFS_ROOT_ITEM_KEY;
|
|
root->root_key.offset = 0;
|
|
|
|
leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0,
|
|
0, BTRFS_NESTING_NORMAL);
|
|
if (IS_ERR(leaf)) {
|
|
ret = PTR_ERR(leaf);
|
|
leaf = NULL;
|
|
goto fail;
|
|
}
|
|
|
|
root->node = leaf;
|
|
btrfs_mark_buffer_dirty(trans, leaf);
|
|
|
|
root->commit_root = btrfs_root_node(root);
|
|
set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
|
|
|
|
btrfs_set_root_flags(&root->root_item, 0);
|
|
btrfs_set_root_limit(&root->root_item, 0);
|
|
btrfs_set_root_bytenr(&root->root_item, leaf->start);
|
|
btrfs_set_root_generation(&root->root_item, trans->transid);
|
|
btrfs_set_root_level(&root->root_item, 0);
|
|
btrfs_set_root_refs(&root->root_item, 1);
|
|
btrfs_set_root_used(&root->root_item, leaf->len);
|
|
btrfs_set_root_last_snapshot(&root->root_item, 0);
|
|
btrfs_set_root_dirid(&root->root_item, 0);
|
|
if (is_fstree(objectid))
|
|
generate_random_guid(root->root_item.uuid);
|
|
else
|
|
export_guid(root->root_item.uuid, &guid_null);
|
|
btrfs_set_root_drop_level(&root->root_item, 0);
|
|
|
|
btrfs_tree_unlock(leaf);
|
|
|
|
key.objectid = objectid;
|
|
key.type = BTRFS_ROOT_ITEM_KEY;
|
|
key.offset = 0;
|
|
ret = btrfs_insert_root(trans, tree_root, &key, &root->root_item);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
return root;
|
|
|
|
fail:
|
|
btrfs_put_root(root);
|
|
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *root;
|
|
|
|
root = btrfs_alloc_root(fs_info, BTRFS_TREE_LOG_OBJECTID, GFP_NOFS);
|
|
if (!root)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID;
|
|
root->root_key.type = BTRFS_ROOT_ITEM_KEY;
|
|
root->root_key.offset = BTRFS_TREE_LOG_OBJECTID;
|
|
|
|
return root;
|
|
}
|
|
|
|
int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root)
|
|
{
|
|
struct extent_buffer *leaf;
|
|
|
|
/*
|
|
* DON'T set SHAREABLE bit for log trees.
|
|
*
|
|
* Log trees are not exposed to user space thus can't be snapshotted,
|
|
* and they go away before a real commit is actually done.
|
|
*
|
|
* They do store pointers to file data extents, and those reference
|
|
* counts still get updated (along with back refs to the log tree).
|
|
*/
|
|
|
|
leaf = btrfs_alloc_tree_block(trans, root, 0, BTRFS_TREE_LOG_OBJECTID,
|
|
NULL, 0, 0, 0, 0, BTRFS_NESTING_NORMAL);
|
|
if (IS_ERR(leaf))
|
|
return PTR_ERR(leaf);
|
|
|
|
root->node = leaf;
|
|
|
|
btrfs_mark_buffer_dirty(trans, root->node);
|
|
btrfs_tree_unlock(root->node);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *log_root;
|
|
|
|
log_root = alloc_log_tree(trans, fs_info);
|
|
if (IS_ERR(log_root))
|
|
return PTR_ERR(log_root);
|
|
|
|
if (!btrfs_is_zoned(fs_info)) {
|
|
int ret = btrfs_alloc_log_tree_node(trans, log_root);
|
|
|
|
if (ret) {
|
|
btrfs_put_root(log_root);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
WARN_ON(fs_info->log_root_tree);
|
|
fs_info->log_root_tree = log_root;
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_root *log_root;
|
|
struct btrfs_inode_item *inode_item;
|
|
int ret;
|
|
|
|
log_root = alloc_log_tree(trans, fs_info);
|
|
if (IS_ERR(log_root))
|
|
return PTR_ERR(log_root);
|
|
|
|
ret = btrfs_alloc_log_tree_node(trans, log_root);
|
|
if (ret) {
|
|
btrfs_put_root(log_root);
|
|
return ret;
|
|
}
|
|
|
|
btrfs_set_root_last_trans(log_root, trans->transid);
|
|
log_root->root_key.offset = btrfs_root_id(root);
|
|
|
|
inode_item = &log_root->root_item.inode;
|
|
btrfs_set_stack_inode_generation(inode_item, 1);
|
|
btrfs_set_stack_inode_size(inode_item, 3);
|
|
btrfs_set_stack_inode_nlink(inode_item, 1);
|
|
btrfs_set_stack_inode_nbytes(inode_item,
|
|
fs_info->nodesize);
|
|
btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
|
|
|
|
btrfs_set_root_node(&log_root->root_item, log_root->node);
|
|
|
|
WARN_ON(root->log_root);
|
|
root->log_root = log_root;
|
|
btrfs_set_root_log_transid(root, 0);
|
|
root->log_transid_committed = -1;
|
|
btrfs_set_root_last_log_commit(root, 0);
|
|
return 0;
|
|
}
|
|
|
|
static struct btrfs_root *read_tree_root_path(struct btrfs_root *tree_root,
|
|
struct btrfs_path *path,
|
|
const struct btrfs_key *key)
|
|
{
|
|
struct btrfs_root *root;
|
|
struct btrfs_tree_parent_check check = { 0 };
|
|
struct btrfs_fs_info *fs_info = tree_root->fs_info;
|
|
u64 generation;
|
|
int ret;
|
|
int level;
|
|
|
|
root = btrfs_alloc_root(fs_info, key->objectid, GFP_NOFS);
|
|
if (!root)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ret = btrfs_find_root(tree_root, key, path,
|
|
&root->root_item, &root->root_key);
|
|
if (ret) {
|
|
if (ret > 0)
|
|
ret = -ENOENT;
|
|
goto fail;
|
|
}
|
|
|
|
generation = btrfs_root_generation(&root->root_item);
|
|
level = btrfs_root_level(&root->root_item);
|
|
check.level = level;
|
|
check.transid = generation;
|
|
check.owner_root = key->objectid;
|
|
root->node = read_tree_block(fs_info, btrfs_root_bytenr(&root->root_item),
|
|
&check);
|
|
if (IS_ERR(root->node)) {
|
|
ret = PTR_ERR(root->node);
|
|
root->node = NULL;
|
|
goto fail;
|
|
}
|
|
if (!btrfs_buffer_uptodate(root->node, generation, 0)) {
|
|
ret = -EIO;
|
|
goto fail;
|
|
}
|
|
|
|
/*
|
|
* For real fs, and not log/reloc trees, root owner must
|
|
* match its root node owner
|
|
*/
|
|
if (!btrfs_is_testing(fs_info) &&
|
|
btrfs_root_id(root) != BTRFS_TREE_LOG_OBJECTID &&
|
|
btrfs_root_id(root) != BTRFS_TREE_RELOC_OBJECTID &&
|
|
btrfs_root_id(root) != btrfs_header_owner(root->node)) {
|
|
btrfs_crit(fs_info,
|
|
"root=%llu block=%llu, tree root owner mismatch, have %llu expect %llu",
|
|
btrfs_root_id(root), root->node->start,
|
|
btrfs_header_owner(root->node),
|
|
btrfs_root_id(root));
|
|
ret = -EUCLEAN;
|
|
goto fail;
|
|
}
|
|
root->commit_root = btrfs_root_node(root);
|
|
return root;
|
|
fail:
|
|
btrfs_put_root(root);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
|
|
const struct btrfs_key *key)
|
|
{
|
|
struct btrfs_root *root;
|
|
struct btrfs_path *path;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return ERR_PTR(-ENOMEM);
|
|
root = read_tree_root_path(tree_root, path, key);
|
|
btrfs_free_path(path);
|
|
|
|
return root;
|
|
}
|
|
|
|
/*
|
|
* Initialize subvolume root in-memory structure
|
|
*
|
|
* @anon_dev: anonymous device to attach to the root, if zero, allocate new
|
|
*/
|
|
static int btrfs_init_fs_root(struct btrfs_root *root, dev_t anon_dev)
|
|
{
|
|
int ret;
|
|
|
|
btrfs_drew_lock_init(&root->snapshot_lock);
|
|
|
|
if (btrfs_root_id(root) != BTRFS_TREE_LOG_OBJECTID &&
|
|
!btrfs_is_data_reloc_root(root) &&
|
|
is_fstree(btrfs_root_id(root))) {
|
|
set_bit(BTRFS_ROOT_SHAREABLE, &root->state);
|
|
btrfs_check_and_init_root_item(&root->root_item);
|
|
}
|
|
|
|
/*
|
|
* Don't assign anonymous block device to roots that are not exposed to
|
|
* userspace, the id pool is limited to 1M
|
|
*/
|
|
if (is_fstree(btrfs_root_id(root)) &&
|
|
btrfs_root_refs(&root->root_item) > 0) {
|
|
if (!anon_dev) {
|
|
ret = get_anon_bdev(&root->anon_dev);
|
|
if (ret)
|
|
goto fail;
|
|
} else {
|
|
root->anon_dev = anon_dev;
|
|
}
|
|
}
|
|
|
|
mutex_lock(&root->objectid_mutex);
|
|
ret = btrfs_init_root_free_objectid(root);
|
|
if (ret) {
|
|
mutex_unlock(&root->objectid_mutex);
|
|
goto fail;
|
|
}
|
|
|
|
ASSERT(root->free_objectid <= BTRFS_LAST_FREE_OBJECTID);
|
|
|
|
mutex_unlock(&root->objectid_mutex);
|
|
|
|
return 0;
|
|
fail:
|
|
/* The caller is responsible to call btrfs_free_fs_root */
|
|
return ret;
|
|
}
|
|
|
|
static struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
|
|
u64 root_id)
|
|
{
|
|
struct btrfs_root *root;
|
|
|
|
spin_lock(&fs_info->fs_roots_radix_lock);
|
|
root = radix_tree_lookup(&fs_info->fs_roots_radix,
|
|
(unsigned long)root_id);
|
|
root = btrfs_grab_root(root);
|
|
spin_unlock(&fs_info->fs_roots_radix_lock);
|
|
return root;
|
|
}
|
|
|
|
static struct btrfs_root *btrfs_get_global_root(struct btrfs_fs_info *fs_info,
|
|
u64 objectid)
|
|
{
|
|
struct btrfs_key key = {
|
|
.objectid = objectid,
|
|
.type = BTRFS_ROOT_ITEM_KEY,
|
|
.offset = 0,
|
|
};
|
|
|
|
switch (objectid) {
|
|
case BTRFS_ROOT_TREE_OBJECTID:
|
|
return btrfs_grab_root(fs_info->tree_root);
|
|
case BTRFS_EXTENT_TREE_OBJECTID:
|
|
return btrfs_grab_root(btrfs_global_root(fs_info, &key));
|
|
case BTRFS_CHUNK_TREE_OBJECTID:
|
|
return btrfs_grab_root(fs_info->chunk_root);
|
|
case BTRFS_DEV_TREE_OBJECTID:
|
|
return btrfs_grab_root(fs_info->dev_root);
|
|
case BTRFS_CSUM_TREE_OBJECTID:
|
|
return btrfs_grab_root(btrfs_global_root(fs_info, &key));
|
|
case BTRFS_QUOTA_TREE_OBJECTID:
|
|
return btrfs_grab_root(fs_info->quota_root);
|
|
case BTRFS_UUID_TREE_OBJECTID:
|
|
return btrfs_grab_root(fs_info->uuid_root);
|
|
case BTRFS_BLOCK_GROUP_TREE_OBJECTID:
|
|
return btrfs_grab_root(fs_info->block_group_root);
|
|
case BTRFS_FREE_SPACE_TREE_OBJECTID:
|
|
return btrfs_grab_root(btrfs_global_root(fs_info, &key));
|
|
case BTRFS_RAID_STRIPE_TREE_OBJECTID:
|
|
return btrfs_grab_root(fs_info->stripe_root);
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_root *root)
|
|
{
|
|
int ret;
|
|
|
|
ret = radix_tree_preload(GFP_NOFS);
|
|
if (ret)
|
|
return ret;
|
|
|
|
spin_lock(&fs_info->fs_roots_radix_lock);
|
|
ret = radix_tree_insert(&fs_info->fs_roots_radix,
|
|
(unsigned long)btrfs_root_id(root),
|
|
root);
|
|
if (ret == 0) {
|
|
btrfs_grab_root(root);
|
|
set_bit(BTRFS_ROOT_IN_RADIX, &root->state);
|
|
}
|
|
spin_unlock(&fs_info->fs_roots_radix_lock);
|
|
radix_tree_preload_end();
|
|
|
|
return ret;
|
|
}
|
|
|
|
void btrfs_check_leaked_roots(const struct btrfs_fs_info *fs_info)
|
|
{
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
struct btrfs_root *root;
|
|
|
|
while (!list_empty(&fs_info->allocated_roots)) {
|
|
char buf[BTRFS_ROOT_NAME_BUF_LEN];
|
|
|
|
root = list_first_entry(&fs_info->allocated_roots,
|
|
struct btrfs_root, leak_list);
|
|
btrfs_err(fs_info, "leaked root %s refcount %d",
|
|
btrfs_root_name(&root->root_key, buf),
|
|
refcount_read(&root->refs));
|
|
WARN_ON_ONCE(1);
|
|
while (refcount_read(&root->refs) > 1)
|
|
btrfs_put_root(root);
|
|
btrfs_put_root(root);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void free_global_roots(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *root;
|
|
struct rb_node *node;
|
|
|
|
while ((node = rb_first_postorder(&fs_info->global_root_tree)) != NULL) {
|
|
root = rb_entry(node, struct btrfs_root, rb_node);
|
|
rb_erase(&root->rb_node, &fs_info->global_root_tree);
|
|
btrfs_put_root(root);
|
|
}
|
|
}
|
|
|
|
void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct percpu_counter *em_counter = &fs_info->evictable_extent_maps;
|
|
|
|
percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
|
|
percpu_counter_destroy(&fs_info->delalloc_bytes);
|
|
percpu_counter_destroy(&fs_info->ordered_bytes);
|
|
if (percpu_counter_initialized(em_counter))
|
|
ASSERT(percpu_counter_sum_positive(em_counter) == 0);
|
|
percpu_counter_destroy(em_counter);
|
|
percpu_counter_destroy(&fs_info->dev_replace.bio_counter);
|
|
btrfs_free_csum_hash(fs_info);
|
|
btrfs_free_stripe_hash_table(fs_info);
|
|
btrfs_free_ref_cache(fs_info);
|
|
kfree(fs_info->balance_ctl);
|
|
kfree(fs_info->delayed_root);
|
|
free_global_roots(fs_info);
|
|
btrfs_put_root(fs_info->tree_root);
|
|
btrfs_put_root(fs_info->chunk_root);
|
|
btrfs_put_root(fs_info->dev_root);
|
|
btrfs_put_root(fs_info->quota_root);
|
|
btrfs_put_root(fs_info->uuid_root);
|
|
btrfs_put_root(fs_info->fs_root);
|
|
btrfs_put_root(fs_info->data_reloc_root);
|
|
btrfs_put_root(fs_info->block_group_root);
|
|
btrfs_put_root(fs_info->stripe_root);
|
|
btrfs_check_leaked_roots(fs_info);
|
|
btrfs_extent_buffer_leak_debug_check(fs_info);
|
|
kfree(fs_info->super_copy);
|
|
kfree(fs_info->super_for_commit);
|
|
kfree(fs_info->subpage_info);
|
|
kvfree(fs_info);
|
|
}
|
|
|
|
|
|
/*
|
|
* Get an in-memory reference of a root structure.
|
|
*
|
|
* For essential trees like root/extent tree, we grab it from fs_info directly.
|
|
* For subvolume trees, we check the cached filesystem roots first. If not
|
|
* found, then read it from disk and add it to cached fs roots.
|
|
*
|
|
* Caller should release the root by calling btrfs_put_root() after the usage.
|
|
*
|
|
* NOTE: Reloc and log trees can't be read by this function as they share the
|
|
* same root objectid.
|
|
*
|
|
* @objectid: root id
|
|
* @anon_dev: preallocated anonymous block device number for new roots,
|
|
* pass NULL for a new allocation.
|
|
* @check_ref: whether to check root item references, If true, return -ENOENT
|
|
* for orphan roots
|
|
*/
|
|
static struct btrfs_root *btrfs_get_root_ref(struct btrfs_fs_info *fs_info,
|
|
u64 objectid, dev_t *anon_dev,
|
|
bool check_ref)
|
|
{
|
|
struct btrfs_root *root;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
int ret;
|
|
|
|
root = btrfs_get_global_root(fs_info, objectid);
|
|
if (root)
|
|
return root;
|
|
|
|
/*
|
|
* If we're called for non-subvolume trees, and above function didn't
|
|
* find one, do not try to read it from disk.
|
|
*
|
|
* This is namely for free-space-tree and quota tree, which can change
|
|
* at runtime and should only be grabbed from fs_info.
|
|
*/
|
|
if (!is_fstree(objectid) && objectid != BTRFS_DATA_RELOC_TREE_OBJECTID)
|
|
return ERR_PTR(-ENOENT);
|
|
again:
|
|
root = btrfs_lookup_fs_root(fs_info, objectid);
|
|
if (root) {
|
|
/*
|
|
* Some other caller may have read out the newly inserted
|
|
* subvolume already (for things like backref walk etc). Not
|
|
* that common but still possible. In that case, we just need
|
|
* to free the anon_dev.
|
|
*/
|
|
if (unlikely(anon_dev && *anon_dev)) {
|
|
free_anon_bdev(*anon_dev);
|
|
*anon_dev = 0;
|
|
}
|
|
|
|
if (check_ref && btrfs_root_refs(&root->root_item) == 0) {
|
|
btrfs_put_root(root);
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
return root;
|
|
}
|
|
|
|
key.objectid = objectid;
|
|
key.type = BTRFS_ROOT_ITEM_KEY;
|
|
key.offset = (u64)-1;
|
|
root = btrfs_read_tree_root(fs_info->tree_root, &key);
|
|
if (IS_ERR(root))
|
|
return root;
|
|
|
|
if (check_ref && btrfs_root_refs(&root->root_item) == 0) {
|
|
ret = -ENOENT;
|
|
goto fail;
|
|
}
|
|
|
|
ret = btrfs_init_fs_root(root, anon_dev ? *anon_dev : 0);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
key.objectid = BTRFS_ORPHAN_OBJECTID;
|
|
key.type = BTRFS_ORPHAN_ITEM_KEY;
|
|
key.offset = objectid;
|
|
|
|
ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
|
|
btrfs_free_path(path);
|
|
if (ret < 0)
|
|
goto fail;
|
|
if (ret == 0)
|
|
set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state);
|
|
|
|
ret = btrfs_insert_fs_root(fs_info, root);
|
|
if (ret) {
|
|
if (ret == -EEXIST) {
|
|
btrfs_put_root(root);
|
|
goto again;
|
|
}
|
|
goto fail;
|
|
}
|
|
return root;
|
|
fail:
|
|
/*
|
|
* If our caller provided us an anonymous device, then it's his
|
|
* responsibility to free it in case we fail. So we have to set our
|
|
* root's anon_dev to 0 to avoid a double free, once by btrfs_put_root()
|
|
* and once again by our caller.
|
|
*/
|
|
if (anon_dev && *anon_dev)
|
|
root->anon_dev = 0;
|
|
btrfs_put_root(root);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
/*
|
|
* Get in-memory reference of a root structure
|
|
*
|
|
* @objectid: tree objectid
|
|
* @check_ref: if set, verify that the tree exists and the item has at least
|
|
* one reference
|
|
*/
|
|
struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
|
|
u64 objectid, bool check_ref)
|
|
{
|
|
return btrfs_get_root_ref(fs_info, objectid, NULL, check_ref);
|
|
}
|
|
|
|
/*
|
|
* Get in-memory reference of a root structure, created as new, optionally pass
|
|
* the anonymous block device id
|
|
*
|
|
* @objectid: tree objectid
|
|
* @anon_dev: if NULL, allocate a new anonymous block device or use the
|
|
* parameter value if not NULL
|
|
*/
|
|
struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
|
|
u64 objectid, dev_t *anon_dev)
|
|
{
|
|
return btrfs_get_root_ref(fs_info, objectid, anon_dev, true);
|
|
}
|
|
|
|
/*
|
|
* Return a root for the given objectid.
|
|
*
|
|
* @fs_info: the fs_info
|
|
* @objectid: the objectid we need to lookup
|
|
*
|
|
* This is exclusively used for backref walking, and exists specifically because
|
|
* of how qgroups does lookups. Qgroups will do a backref lookup at delayed ref
|
|
* creation time, which means we may have to read the tree_root in order to look
|
|
* up a fs root that is not in memory. If the root is not in memory we will
|
|
* read the tree root commit root and look up the fs root from there. This is a
|
|
* temporary root, it will not be inserted into the radix tree as it doesn't
|
|
* have the most uptodate information, it'll simply be discarded once the
|
|
* backref code is finished using the root.
|
|
*/
|
|
struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_path *path,
|
|
u64 objectid)
|
|
{
|
|
struct btrfs_root *root;
|
|
struct btrfs_key key;
|
|
|
|
ASSERT(path->search_commit_root && path->skip_locking);
|
|
|
|
/*
|
|
* This can return -ENOENT if we ask for a root that doesn't exist, but
|
|
* since this is called via the backref walking code we won't be looking
|
|
* up a root that doesn't exist, unless there's corruption. So if root
|
|
* != NULL just return it.
|
|
*/
|
|
root = btrfs_get_global_root(fs_info, objectid);
|
|
if (root)
|
|
return root;
|
|
|
|
root = btrfs_lookup_fs_root(fs_info, objectid);
|
|
if (root)
|
|
return root;
|
|
|
|
key.objectid = objectid;
|
|
key.type = BTRFS_ROOT_ITEM_KEY;
|
|
key.offset = (u64)-1;
|
|
root = read_tree_root_path(fs_info->tree_root, path, &key);
|
|
btrfs_release_path(path);
|
|
|
|
return root;
|
|
}
|
|
|
|
static int cleaner_kthread(void *arg)
|
|
{
|
|
struct btrfs_fs_info *fs_info = arg;
|
|
int again;
|
|
|
|
while (1) {
|
|
again = 0;
|
|
|
|
set_bit(BTRFS_FS_CLEANER_RUNNING, &fs_info->flags);
|
|
|
|
/* Make the cleaner go to sleep early. */
|
|
if (btrfs_need_cleaner_sleep(fs_info))
|
|
goto sleep;
|
|
|
|
/*
|
|
* Do not do anything if we might cause open_ctree() to block
|
|
* before we have finished mounting the filesystem.
|
|
*/
|
|
if (!test_bit(BTRFS_FS_OPEN, &fs_info->flags))
|
|
goto sleep;
|
|
|
|
if (!mutex_trylock(&fs_info->cleaner_mutex))
|
|
goto sleep;
|
|
|
|
/*
|
|
* Avoid the problem that we change the status of the fs
|
|
* during the above check and trylock.
|
|
*/
|
|
if (btrfs_need_cleaner_sleep(fs_info)) {
|
|
mutex_unlock(&fs_info->cleaner_mutex);
|
|
goto sleep;
|
|
}
|
|
|
|
if (test_and_clear_bit(BTRFS_FS_FEATURE_CHANGED, &fs_info->flags))
|
|
btrfs_sysfs_feature_update(fs_info);
|
|
|
|
btrfs_run_delayed_iputs(fs_info);
|
|
|
|
again = btrfs_clean_one_deleted_snapshot(fs_info);
|
|
mutex_unlock(&fs_info->cleaner_mutex);
|
|
|
|
/*
|
|
* The defragger has dealt with the R/O remount and umount,
|
|
* needn't do anything special here.
|
|
*/
|
|
btrfs_run_defrag_inodes(fs_info);
|
|
|
|
/*
|
|
* Acquires fs_info->reclaim_bgs_lock to avoid racing
|
|
* with relocation (btrfs_relocate_chunk) and relocation
|
|
* acquires fs_info->cleaner_mutex (btrfs_relocate_block_group)
|
|
* after acquiring fs_info->reclaim_bgs_lock. So we
|
|
* can't hold, nor need to, fs_info->cleaner_mutex when deleting
|
|
* unused block groups.
|
|
*/
|
|
btrfs_delete_unused_bgs(fs_info);
|
|
|
|
/*
|
|
* Reclaim block groups in the reclaim_bgs list after we deleted
|
|
* all unused block_groups. This possibly gives us some more free
|
|
* space.
|
|
*/
|
|
btrfs_reclaim_bgs(fs_info);
|
|
sleep:
|
|
clear_and_wake_up_bit(BTRFS_FS_CLEANER_RUNNING, &fs_info->flags);
|
|
if (kthread_should_park())
|
|
kthread_parkme();
|
|
if (kthread_should_stop())
|
|
return 0;
|
|
if (!again) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
schedule();
|
|
__set_current_state(TASK_RUNNING);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int transaction_kthread(void *arg)
|
|
{
|
|
struct btrfs_root *root = arg;
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_transaction *cur;
|
|
u64 transid;
|
|
time64_t delta;
|
|
unsigned long delay;
|
|
bool cannot_commit;
|
|
|
|
do {
|
|
cannot_commit = false;
|
|
delay = msecs_to_jiffies(fs_info->commit_interval * 1000);
|
|
mutex_lock(&fs_info->transaction_kthread_mutex);
|
|
|
|
spin_lock(&fs_info->trans_lock);
|
|
cur = fs_info->running_transaction;
|
|
if (!cur) {
|
|
spin_unlock(&fs_info->trans_lock);
|
|
goto sleep;
|
|
}
|
|
|
|
delta = ktime_get_seconds() - cur->start_time;
|
|
if (!test_and_clear_bit(BTRFS_FS_COMMIT_TRANS, &fs_info->flags) &&
|
|
cur->state < TRANS_STATE_COMMIT_PREP &&
|
|
delta < fs_info->commit_interval) {
|
|
spin_unlock(&fs_info->trans_lock);
|
|
delay -= msecs_to_jiffies((delta - 1) * 1000);
|
|
delay = min(delay,
|
|
msecs_to_jiffies(fs_info->commit_interval * 1000));
|
|
goto sleep;
|
|
}
|
|
transid = cur->transid;
|
|
spin_unlock(&fs_info->trans_lock);
|
|
|
|
/* If the file system is aborted, this will always fail. */
|
|
trans = btrfs_attach_transaction(root);
|
|
if (IS_ERR(trans)) {
|
|
if (PTR_ERR(trans) != -ENOENT)
|
|
cannot_commit = true;
|
|
goto sleep;
|
|
}
|
|
if (transid == trans->transid) {
|
|
btrfs_commit_transaction(trans);
|
|
} else {
|
|
btrfs_end_transaction(trans);
|
|
}
|
|
sleep:
|
|
wake_up_process(fs_info->cleaner_kthread);
|
|
mutex_unlock(&fs_info->transaction_kthread_mutex);
|
|
|
|
if (BTRFS_FS_ERROR(fs_info))
|
|
btrfs_cleanup_transaction(fs_info);
|
|
if (!kthread_should_stop() &&
|
|
(!btrfs_transaction_blocked(fs_info) ||
|
|
cannot_commit))
|
|
schedule_timeout_interruptible(delay);
|
|
} while (!kthread_should_stop());
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This will find the highest generation in the array of root backups. The
|
|
* index of the highest array is returned, or -EINVAL if we can't find
|
|
* anything.
|
|
*
|
|
* We check to make sure the array is valid by comparing the
|
|
* generation of the latest root in the array with the generation
|
|
* in the super block. If they don't match we pitch it.
|
|
*/
|
|
static int find_newest_super_backup(struct btrfs_fs_info *info)
|
|
{
|
|
const u64 newest_gen = btrfs_super_generation(info->super_copy);
|
|
u64 cur;
|
|
struct btrfs_root_backup *root_backup;
|
|
int i;
|
|
|
|
for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
|
|
root_backup = info->super_copy->super_roots + i;
|
|
cur = btrfs_backup_tree_root_gen(root_backup);
|
|
if (cur == newest_gen)
|
|
return i;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* copy all the root pointers into the super backup array.
|
|
* this will bump the backup pointer by one when it is
|
|
* done
|
|
*/
|
|
static void backup_super_roots(struct btrfs_fs_info *info)
|
|
{
|
|
const int next_backup = info->backup_root_index;
|
|
struct btrfs_root_backup *root_backup;
|
|
|
|
root_backup = info->super_for_commit->super_roots + next_backup;
|
|
|
|
/*
|
|
* make sure all of our padding and empty slots get zero filled
|
|
* regardless of which ones we use today
|
|
*/
|
|
memset(root_backup, 0, sizeof(*root_backup));
|
|
|
|
info->backup_root_index = (next_backup + 1) % BTRFS_NUM_BACKUP_ROOTS;
|
|
|
|
btrfs_set_backup_tree_root(root_backup, info->tree_root->node->start);
|
|
btrfs_set_backup_tree_root_gen(root_backup,
|
|
btrfs_header_generation(info->tree_root->node));
|
|
|
|
btrfs_set_backup_tree_root_level(root_backup,
|
|
btrfs_header_level(info->tree_root->node));
|
|
|
|
btrfs_set_backup_chunk_root(root_backup, info->chunk_root->node->start);
|
|
btrfs_set_backup_chunk_root_gen(root_backup,
|
|
btrfs_header_generation(info->chunk_root->node));
|
|
btrfs_set_backup_chunk_root_level(root_backup,
|
|
btrfs_header_level(info->chunk_root->node));
|
|
|
|
if (!btrfs_fs_compat_ro(info, BLOCK_GROUP_TREE)) {
|
|
struct btrfs_root *extent_root = btrfs_extent_root(info, 0);
|
|
struct btrfs_root *csum_root = btrfs_csum_root(info, 0);
|
|
|
|
btrfs_set_backup_extent_root(root_backup,
|
|
extent_root->node->start);
|
|
btrfs_set_backup_extent_root_gen(root_backup,
|
|
btrfs_header_generation(extent_root->node));
|
|
btrfs_set_backup_extent_root_level(root_backup,
|
|
btrfs_header_level(extent_root->node));
|
|
|
|
btrfs_set_backup_csum_root(root_backup, csum_root->node->start);
|
|
btrfs_set_backup_csum_root_gen(root_backup,
|
|
btrfs_header_generation(csum_root->node));
|
|
btrfs_set_backup_csum_root_level(root_backup,
|
|
btrfs_header_level(csum_root->node));
|
|
}
|
|
|
|
/*
|
|
* we might commit during log recovery, which happens before we set
|
|
* the fs_root. Make sure it is valid before we fill it in.
|
|
*/
|
|
if (info->fs_root && info->fs_root->node) {
|
|
btrfs_set_backup_fs_root(root_backup,
|
|
info->fs_root->node->start);
|
|
btrfs_set_backup_fs_root_gen(root_backup,
|
|
btrfs_header_generation(info->fs_root->node));
|
|
btrfs_set_backup_fs_root_level(root_backup,
|
|
btrfs_header_level(info->fs_root->node));
|
|
}
|
|
|
|
btrfs_set_backup_dev_root(root_backup, info->dev_root->node->start);
|
|
btrfs_set_backup_dev_root_gen(root_backup,
|
|
btrfs_header_generation(info->dev_root->node));
|
|
btrfs_set_backup_dev_root_level(root_backup,
|
|
btrfs_header_level(info->dev_root->node));
|
|
|
|
btrfs_set_backup_total_bytes(root_backup,
|
|
btrfs_super_total_bytes(info->super_copy));
|
|
btrfs_set_backup_bytes_used(root_backup,
|
|
btrfs_super_bytes_used(info->super_copy));
|
|
btrfs_set_backup_num_devices(root_backup,
|
|
btrfs_super_num_devices(info->super_copy));
|
|
|
|
/*
|
|
* if we don't copy this out to the super_copy, it won't get remembered
|
|
* for the next commit
|
|
*/
|
|
memcpy(&info->super_copy->super_roots,
|
|
&info->super_for_commit->super_roots,
|
|
sizeof(*root_backup) * BTRFS_NUM_BACKUP_ROOTS);
|
|
}
|
|
|
|
/*
|
|
* Reads a backup root based on the passed priority. Prio 0 is the newest, prio
|
|
* 1/2/3 are 2nd newest/3rd newest/4th (oldest) backup roots
|
|
*
|
|
* @fs_info: filesystem whose backup roots need to be read
|
|
* @priority: priority of backup root required
|
|
*
|
|
* Returns backup root index on success and -EINVAL otherwise.
|
|
*/
|
|
static int read_backup_root(struct btrfs_fs_info *fs_info, u8 priority)
|
|
{
|
|
int backup_index = find_newest_super_backup(fs_info);
|
|
struct btrfs_super_block *super = fs_info->super_copy;
|
|
struct btrfs_root_backup *root_backup;
|
|
|
|
if (priority < BTRFS_NUM_BACKUP_ROOTS && backup_index >= 0) {
|
|
if (priority == 0)
|
|
return backup_index;
|
|
|
|
backup_index = backup_index + BTRFS_NUM_BACKUP_ROOTS - priority;
|
|
backup_index %= BTRFS_NUM_BACKUP_ROOTS;
|
|
} else {
|
|
return -EINVAL;
|
|
}
|
|
|
|
root_backup = super->super_roots + backup_index;
|
|
|
|
btrfs_set_super_generation(super,
|
|
btrfs_backup_tree_root_gen(root_backup));
|
|
btrfs_set_super_root(super, btrfs_backup_tree_root(root_backup));
|
|
btrfs_set_super_root_level(super,
|
|
btrfs_backup_tree_root_level(root_backup));
|
|
btrfs_set_super_bytes_used(super, btrfs_backup_bytes_used(root_backup));
|
|
|
|
/*
|
|
* Fixme: the total bytes and num_devices need to match or we should
|
|
* need a fsck
|
|
*/
|
|
btrfs_set_super_total_bytes(super, btrfs_backup_total_bytes(root_backup));
|
|
btrfs_set_super_num_devices(super, btrfs_backup_num_devices(root_backup));
|
|
|
|
return backup_index;
|
|
}
|
|
|
|
/* helper to cleanup workers */
|
|
static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info)
|
|
{
|
|
btrfs_destroy_workqueue(fs_info->fixup_workers);
|
|
btrfs_destroy_workqueue(fs_info->delalloc_workers);
|
|
btrfs_destroy_workqueue(fs_info->workers);
|
|
if (fs_info->endio_workers)
|
|
destroy_workqueue(fs_info->endio_workers);
|
|
if (fs_info->rmw_workers)
|
|
destroy_workqueue(fs_info->rmw_workers);
|
|
if (fs_info->compressed_write_workers)
|
|
destroy_workqueue(fs_info->compressed_write_workers);
|
|
btrfs_destroy_workqueue(fs_info->endio_write_workers);
|
|
btrfs_destroy_workqueue(fs_info->endio_freespace_worker);
|
|
btrfs_destroy_workqueue(fs_info->delayed_workers);
|
|
btrfs_destroy_workqueue(fs_info->caching_workers);
|
|
btrfs_destroy_workqueue(fs_info->flush_workers);
|
|
btrfs_destroy_workqueue(fs_info->qgroup_rescan_workers);
|
|
if (fs_info->discard_ctl.discard_workers)
|
|
destroy_workqueue(fs_info->discard_ctl.discard_workers);
|
|
/*
|
|
* Now that all other work queues are destroyed, we can safely destroy
|
|
* the queues used for metadata I/O, since tasks from those other work
|
|
* queues can do metadata I/O operations.
|
|
*/
|
|
if (fs_info->endio_meta_workers)
|
|
destroy_workqueue(fs_info->endio_meta_workers);
|
|
}
|
|
|
|
static void free_root_extent_buffers(struct btrfs_root *root)
|
|
{
|
|
if (root) {
|
|
free_extent_buffer(root->node);
|
|
free_extent_buffer(root->commit_root);
|
|
root->node = NULL;
|
|
root->commit_root = NULL;
|
|
}
|
|
}
|
|
|
|
static void free_global_root_pointers(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *root, *tmp;
|
|
|
|
rbtree_postorder_for_each_entry_safe(root, tmp,
|
|
&fs_info->global_root_tree,
|
|
rb_node)
|
|
free_root_extent_buffers(root);
|
|
}
|
|
|
|
/* helper to cleanup tree roots */
|
|
static void free_root_pointers(struct btrfs_fs_info *info, bool free_chunk_root)
|
|
{
|
|
free_root_extent_buffers(info->tree_root);
|
|
|
|
free_global_root_pointers(info);
|
|
free_root_extent_buffers(info->dev_root);
|
|
free_root_extent_buffers(info->quota_root);
|
|
free_root_extent_buffers(info->uuid_root);
|
|
free_root_extent_buffers(info->fs_root);
|
|
free_root_extent_buffers(info->data_reloc_root);
|
|
free_root_extent_buffers(info->block_group_root);
|
|
free_root_extent_buffers(info->stripe_root);
|
|
if (free_chunk_root)
|
|
free_root_extent_buffers(info->chunk_root);
|
|
}
|
|
|
|
void btrfs_put_root(struct btrfs_root *root)
|
|
{
|
|
if (!root)
|
|
return;
|
|
|
|
if (refcount_dec_and_test(&root->refs)) {
|
|
if (WARN_ON(!xa_empty(&root->inodes)))
|
|
xa_destroy(&root->inodes);
|
|
WARN_ON(test_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state));
|
|
if (root->anon_dev)
|
|
free_anon_bdev(root->anon_dev);
|
|
free_root_extent_buffers(root);
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
spin_lock(&root->fs_info->fs_roots_radix_lock);
|
|
list_del_init(&root->leak_list);
|
|
spin_unlock(&root->fs_info->fs_roots_radix_lock);
|
|
#endif
|
|
kfree(root);
|
|
}
|
|
}
|
|
|
|
void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info)
|
|
{
|
|
int ret;
|
|
struct btrfs_root *gang[8];
|
|
int i;
|
|
|
|
while (!list_empty(&fs_info->dead_roots)) {
|
|
gang[0] = list_entry(fs_info->dead_roots.next,
|
|
struct btrfs_root, root_list);
|
|
list_del(&gang[0]->root_list);
|
|
|
|
if (test_bit(BTRFS_ROOT_IN_RADIX, &gang[0]->state))
|
|
btrfs_drop_and_free_fs_root(fs_info, gang[0]);
|
|
btrfs_put_root(gang[0]);
|
|
}
|
|
|
|
while (1) {
|
|
ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
|
|
(void **)gang, 0,
|
|
ARRAY_SIZE(gang));
|
|
if (!ret)
|
|
break;
|
|
for (i = 0; i < ret; i++)
|
|
btrfs_drop_and_free_fs_root(fs_info, gang[i]);
|
|
}
|
|
}
|
|
|
|
static void btrfs_init_scrub(struct btrfs_fs_info *fs_info)
|
|
{
|
|
mutex_init(&fs_info->scrub_lock);
|
|
atomic_set(&fs_info->scrubs_running, 0);
|
|
atomic_set(&fs_info->scrub_pause_req, 0);
|
|
atomic_set(&fs_info->scrubs_paused, 0);
|
|
atomic_set(&fs_info->scrub_cancel_req, 0);
|
|
init_waitqueue_head(&fs_info->scrub_pause_wait);
|
|
refcount_set(&fs_info->scrub_workers_refcnt, 0);
|
|
}
|
|
|
|
static void btrfs_init_balance(struct btrfs_fs_info *fs_info)
|
|
{
|
|
spin_lock_init(&fs_info->balance_lock);
|
|
mutex_init(&fs_info->balance_mutex);
|
|
atomic_set(&fs_info->balance_pause_req, 0);
|
|
atomic_set(&fs_info->balance_cancel_req, 0);
|
|
fs_info->balance_ctl = NULL;
|
|
init_waitqueue_head(&fs_info->balance_wait_q);
|
|
atomic_set(&fs_info->reloc_cancel_req, 0);
|
|
}
|
|
|
|
static int btrfs_init_btree_inode(struct super_block *sb)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
|
|
unsigned long hash = btrfs_inode_hash(BTRFS_BTREE_INODE_OBJECTID,
|
|
fs_info->tree_root);
|
|
struct inode *inode;
|
|
|
|
inode = new_inode(sb);
|
|
if (!inode)
|
|
return -ENOMEM;
|
|
|
|
btrfs_set_inode_number(BTRFS_I(inode), BTRFS_BTREE_INODE_OBJECTID);
|
|
set_nlink(inode, 1);
|
|
/*
|
|
* we set the i_size on the btree inode to the max possible int.
|
|
* the real end of the address space is determined by all of
|
|
* the devices in the system
|
|
*/
|
|
inode->i_size = OFFSET_MAX;
|
|
inode->i_mapping->a_ops = &btree_aops;
|
|
mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
|
|
|
|
extent_io_tree_init(fs_info, &BTRFS_I(inode)->io_tree,
|
|
IO_TREE_BTREE_INODE_IO);
|
|
extent_map_tree_init(&BTRFS_I(inode)->extent_tree);
|
|
|
|
BTRFS_I(inode)->root = btrfs_grab_root(fs_info->tree_root);
|
|
set_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags);
|
|
__insert_inode_hash(inode, hash);
|
|
fs_info->btree_inode = inode;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void btrfs_init_dev_replace_locks(struct btrfs_fs_info *fs_info)
|
|
{
|
|
mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount);
|
|
init_rwsem(&fs_info->dev_replace.rwsem);
|
|
init_waitqueue_head(&fs_info->dev_replace.replace_wait);
|
|
}
|
|
|
|
static void btrfs_init_qgroup(struct btrfs_fs_info *fs_info)
|
|
{
|
|
spin_lock_init(&fs_info->qgroup_lock);
|
|
mutex_init(&fs_info->qgroup_ioctl_lock);
|
|
fs_info->qgroup_tree = RB_ROOT;
|
|
INIT_LIST_HEAD(&fs_info->dirty_qgroups);
|
|
fs_info->qgroup_seq = 1;
|
|
fs_info->qgroup_ulist = NULL;
|
|
fs_info->qgroup_rescan_running = false;
|
|
fs_info->qgroup_drop_subtree_thres = BTRFS_MAX_LEVEL;
|
|
mutex_init(&fs_info->qgroup_rescan_lock);
|
|
}
|
|
|
|
static int btrfs_init_workqueues(struct btrfs_fs_info *fs_info)
|
|
{
|
|
u32 max_active = fs_info->thread_pool_size;
|
|
unsigned int flags = WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_UNBOUND;
|
|
unsigned int ordered_flags = WQ_MEM_RECLAIM | WQ_FREEZABLE;
|
|
|
|
fs_info->workers =
|
|
btrfs_alloc_workqueue(fs_info, "worker", flags, max_active, 16);
|
|
|
|
fs_info->delalloc_workers =
|
|
btrfs_alloc_workqueue(fs_info, "delalloc",
|
|
flags, max_active, 2);
|
|
|
|
fs_info->flush_workers =
|
|
btrfs_alloc_workqueue(fs_info, "flush_delalloc",
|
|
flags, max_active, 0);
|
|
|
|
fs_info->caching_workers =
|
|
btrfs_alloc_workqueue(fs_info, "cache", flags, max_active, 0);
|
|
|
|
fs_info->fixup_workers =
|
|
btrfs_alloc_ordered_workqueue(fs_info, "fixup", ordered_flags);
|
|
|
|
fs_info->endio_workers =
|
|
alloc_workqueue("btrfs-endio", flags, max_active);
|
|
fs_info->endio_meta_workers =
|
|
alloc_workqueue("btrfs-endio-meta", flags, max_active);
|
|
fs_info->rmw_workers = alloc_workqueue("btrfs-rmw", flags, max_active);
|
|
fs_info->endio_write_workers =
|
|
btrfs_alloc_workqueue(fs_info, "endio-write", flags,
|
|
max_active, 2);
|
|
fs_info->compressed_write_workers =
|
|
alloc_workqueue("btrfs-compressed-write", flags, max_active);
|
|
fs_info->endio_freespace_worker =
|
|
btrfs_alloc_workqueue(fs_info, "freespace-write", flags,
|
|
max_active, 0);
|
|
fs_info->delayed_workers =
|
|
btrfs_alloc_workqueue(fs_info, "delayed-meta", flags,
|
|
max_active, 0);
|
|
fs_info->qgroup_rescan_workers =
|
|
btrfs_alloc_ordered_workqueue(fs_info, "qgroup-rescan",
|
|
ordered_flags);
|
|
fs_info->discard_ctl.discard_workers =
|
|
alloc_ordered_workqueue("btrfs_discard", WQ_FREEZABLE);
|
|
|
|
if (!(fs_info->workers &&
|
|
fs_info->delalloc_workers && fs_info->flush_workers &&
|
|
fs_info->endio_workers && fs_info->endio_meta_workers &&
|
|
fs_info->compressed_write_workers &&
|
|
fs_info->endio_write_workers &&
|
|
fs_info->endio_freespace_worker && fs_info->rmw_workers &&
|
|
fs_info->caching_workers && fs_info->fixup_workers &&
|
|
fs_info->delayed_workers && fs_info->qgroup_rescan_workers &&
|
|
fs_info->discard_ctl.discard_workers)) {
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int btrfs_init_csum_hash(struct btrfs_fs_info *fs_info, u16 csum_type)
|
|
{
|
|
struct crypto_shash *csum_shash;
|
|
const char *csum_driver = btrfs_super_csum_driver(csum_type);
|
|
|
|
csum_shash = crypto_alloc_shash(csum_driver, 0, 0);
|
|
|
|
if (IS_ERR(csum_shash)) {
|
|
btrfs_err(fs_info, "error allocating %s hash for checksum",
|
|
csum_driver);
|
|
return PTR_ERR(csum_shash);
|
|
}
|
|
|
|
fs_info->csum_shash = csum_shash;
|
|
|
|
/*
|
|
* Check if the checksum implementation is a fast accelerated one.
|
|
* As-is this is a bit of a hack and should be replaced once the csum
|
|
* implementations provide that information themselves.
|
|
*/
|
|
switch (csum_type) {
|
|
case BTRFS_CSUM_TYPE_CRC32:
|
|
if (!strstr(crypto_shash_driver_name(csum_shash), "generic"))
|
|
set_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags);
|
|
break;
|
|
case BTRFS_CSUM_TYPE_XXHASH:
|
|
set_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
btrfs_info(fs_info, "using %s (%s) checksum algorithm",
|
|
btrfs_super_csum_name(csum_type),
|
|
crypto_shash_driver_name(csum_shash));
|
|
return 0;
|
|
}
|
|
|
|
static int btrfs_replay_log(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_fs_devices *fs_devices)
|
|
{
|
|
int ret;
|
|
struct btrfs_tree_parent_check check = { 0 };
|
|
struct btrfs_root *log_tree_root;
|
|
struct btrfs_super_block *disk_super = fs_info->super_copy;
|
|
u64 bytenr = btrfs_super_log_root(disk_super);
|
|
int level = btrfs_super_log_root_level(disk_super);
|
|
|
|
if (fs_devices->rw_devices == 0) {
|
|
btrfs_warn(fs_info, "log replay required on RO media");
|
|
return -EIO;
|
|
}
|
|
|
|
log_tree_root = btrfs_alloc_root(fs_info, BTRFS_TREE_LOG_OBJECTID,
|
|
GFP_KERNEL);
|
|
if (!log_tree_root)
|
|
return -ENOMEM;
|
|
|
|
check.level = level;
|
|
check.transid = fs_info->generation + 1;
|
|
check.owner_root = BTRFS_TREE_LOG_OBJECTID;
|
|
log_tree_root->node = read_tree_block(fs_info, bytenr, &check);
|
|
if (IS_ERR(log_tree_root->node)) {
|
|
btrfs_warn(fs_info, "failed to read log tree");
|
|
ret = PTR_ERR(log_tree_root->node);
|
|
log_tree_root->node = NULL;
|
|
btrfs_put_root(log_tree_root);
|
|
return ret;
|
|
}
|
|
if (!extent_buffer_uptodate(log_tree_root->node)) {
|
|
btrfs_err(fs_info, "failed to read log tree");
|
|
btrfs_put_root(log_tree_root);
|
|
return -EIO;
|
|
}
|
|
|
|
/* returns with log_tree_root freed on success */
|
|
ret = btrfs_recover_log_trees(log_tree_root);
|
|
if (ret) {
|
|
btrfs_handle_fs_error(fs_info, ret,
|
|
"Failed to recover log tree");
|
|
btrfs_put_root(log_tree_root);
|
|
return ret;
|
|
}
|
|
|
|
if (sb_rdonly(fs_info->sb)) {
|
|
ret = btrfs_commit_super(fs_info);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int load_global_roots_objectid(struct btrfs_root *tree_root,
|
|
struct btrfs_path *path, u64 objectid,
|
|
const char *name)
|
|
{
|
|
struct btrfs_fs_info *fs_info = tree_root->fs_info;
|
|
struct btrfs_root *root;
|
|
u64 max_global_id = 0;
|
|
int ret;
|
|
struct btrfs_key key = {
|
|
.objectid = objectid,
|
|
.type = BTRFS_ROOT_ITEM_KEY,
|
|
.offset = 0,
|
|
};
|
|
bool found = false;
|
|
|
|
/* If we have IGNOREDATACSUMS skip loading these roots. */
|
|
if (objectid == BTRFS_CSUM_TREE_OBJECTID &&
|
|
btrfs_test_opt(fs_info, IGNOREDATACSUMS)) {
|
|
set_bit(BTRFS_FS_STATE_NO_DATA_CSUMS, &fs_info->fs_state);
|
|
return 0;
|
|
}
|
|
|
|
while (1) {
|
|
ret = btrfs_search_slot(NULL, tree_root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
break;
|
|
|
|
if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
|
|
ret = btrfs_next_leaf(tree_root, path);
|
|
if (ret) {
|
|
if (ret > 0)
|
|
ret = 0;
|
|
break;
|
|
}
|
|
}
|
|
ret = 0;
|
|
|
|
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
|
|
if (key.objectid != objectid)
|
|
break;
|
|
btrfs_release_path(path);
|
|
|
|
/*
|
|
* Just worry about this for extent tree, it'll be the same for
|
|
* everybody.
|
|
*/
|
|
if (objectid == BTRFS_EXTENT_TREE_OBJECTID)
|
|
max_global_id = max(max_global_id, key.offset);
|
|
|
|
found = true;
|
|
root = read_tree_root_path(tree_root, path, &key);
|
|
if (IS_ERR(root)) {
|
|
if (!btrfs_test_opt(fs_info, IGNOREBADROOTS))
|
|
ret = PTR_ERR(root);
|
|
break;
|
|
}
|
|
set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
|
|
ret = btrfs_global_root_insert(root);
|
|
if (ret) {
|
|
btrfs_put_root(root);
|
|
break;
|
|
}
|
|
key.offset++;
|
|
}
|
|
btrfs_release_path(path);
|
|
|
|
if (objectid == BTRFS_EXTENT_TREE_OBJECTID)
|
|
fs_info->nr_global_roots = max_global_id + 1;
|
|
|
|
if (!found || ret) {
|
|
if (objectid == BTRFS_CSUM_TREE_OBJECTID)
|
|
set_bit(BTRFS_FS_STATE_NO_DATA_CSUMS, &fs_info->fs_state);
|
|
|
|
if (!btrfs_test_opt(fs_info, IGNOREBADROOTS))
|
|
ret = ret ? ret : -ENOENT;
|
|
else
|
|
ret = 0;
|
|
btrfs_err(fs_info, "failed to load root %s", name);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int load_global_roots(struct btrfs_root *tree_root)
|
|
{
|
|
struct btrfs_path *path;
|
|
int ret = 0;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
ret = load_global_roots_objectid(tree_root, path,
|
|
BTRFS_EXTENT_TREE_OBJECTID, "extent");
|
|
if (ret)
|
|
goto out;
|
|
ret = load_global_roots_objectid(tree_root, path,
|
|
BTRFS_CSUM_TREE_OBJECTID, "csum");
|
|
if (ret)
|
|
goto out;
|
|
if (!btrfs_fs_compat_ro(tree_root->fs_info, FREE_SPACE_TREE))
|
|
goto out;
|
|
ret = load_global_roots_objectid(tree_root, path,
|
|
BTRFS_FREE_SPACE_TREE_OBJECTID,
|
|
"free space");
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_read_roots(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *tree_root = fs_info->tree_root;
|
|
struct btrfs_root *root;
|
|
struct btrfs_key location;
|
|
int ret;
|
|
|
|
ASSERT(fs_info->tree_root);
|
|
|
|
ret = load_global_roots(tree_root);
|
|
if (ret)
|
|
return ret;
|
|
|
|
location.type = BTRFS_ROOT_ITEM_KEY;
|
|
location.offset = 0;
|
|
|
|
if (btrfs_fs_compat_ro(fs_info, BLOCK_GROUP_TREE)) {
|
|
location.objectid = BTRFS_BLOCK_GROUP_TREE_OBJECTID;
|
|
root = btrfs_read_tree_root(tree_root, &location);
|
|
if (IS_ERR(root)) {
|
|
if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) {
|
|
ret = PTR_ERR(root);
|
|
goto out;
|
|
}
|
|
} else {
|
|
set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
|
|
fs_info->block_group_root = root;
|
|
}
|
|
}
|
|
|
|
location.objectid = BTRFS_DEV_TREE_OBJECTID;
|
|
root = btrfs_read_tree_root(tree_root, &location);
|
|
if (IS_ERR(root)) {
|
|
if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) {
|
|
ret = PTR_ERR(root);
|
|
goto out;
|
|
}
|
|
} else {
|
|
set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
|
|
fs_info->dev_root = root;
|
|
}
|
|
/* Initialize fs_info for all devices in any case */
|
|
ret = btrfs_init_devices_late(fs_info);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/*
|
|
* This tree can share blocks with some other fs tree during relocation
|
|
* and we need a proper setup by btrfs_get_fs_root
|
|
*/
|
|
root = btrfs_get_fs_root(tree_root->fs_info,
|
|
BTRFS_DATA_RELOC_TREE_OBJECTID, true);
|
|
if (IS_ERR(root)) {
|
|
if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) {
|
|
ret = PTR_ERR(root);
|
|
goto out;
|
|
}
|
|
} else {
|
|
set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
|
|
fs_info->data_reloc_root = root;
|
|
}
|
|
|
|
location.objectid = BTRFS_QUOTA_TREE_OBJECTID;
|
|
root = btrfs_read_tree_root(tree_root, &location);
|
|
if (!IS_ERR(root)) {
|
|
set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
|
|
fs_info->quota_root = root;
|
|
}
|
|
|
|
location.objectid = BTRFS_UUID_TREE_OBJECTID;
|
|
root = btrfs_read_tree_root(tree_root, &location);
|
|
if (IS_ERR(root)) {
|
|
if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) {
|
|
ret = PTR_ERR(root);
|
|
if (ret != -ENOENT)
|
|
goto out;
|
|
}
|
|
} else {
|
|
set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
|
|
fs_info->uuid_root = root;
|
|
}
|
|
|
|
if (btrfs_fs_incompat(fs_info, RAID_STRIPE_TREE)) {
|
|
location.objectid = BTRFS_RAID_STRIPE_TREE_OBJECTID;
|
|
root = btrfs_read_tree_root(tree_root, &location);
|
|
if (IS_ERR(root)) {
|
|
if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) {
|
|
ret = PTR_ERR(root);
|
|
goto out;
|
|
}
|
|
} else {
|
|
set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
|
|
fs_info->stripe_root = root;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
out:
|
|
btrfs_warn(fs_info, "failed to read root (objectid=%llu): %d",
|
|
location.objectid, ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Real super block validation
|
|
* NOTE: super csum type and incompat features will not be checked here.
|
|
*
|
|
* @sb: super block to check
|
|
* @mirror_num: the super block number to check its bytenr:
|
|
* 0 the primary (1st) sb
|
|
* 1, 2 2nd and 3rd backup copy
|
|
* -1 skip bytenr check
|
|
*/
|
|
int btrfs_validate_super(const struct btrfs_fs_info *fs_info,
|
|
const struct btrfs_super_block *sb, int mirror_num)
|
|
{
|
|
u64 nodesize = btrfs_super_nodesize(sb);
|
|
u64 sectorsize = btrfs_super_sectorsize(sb);
|
|
int ret = 0;
|
|
const bool ignore_flags = btrfs_test_opt(fs_info, IGNORESUPERFLAGS);
|
|
|
|
if (btrfs_super_magic(sb) != BTRFS_MAGIC) {
|
|
btrfs_err(fs_info, "no valid FS found");
|
|
ret = -EINVAL;
|
|
}
|
|
if ((btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP)) {
|
|
if (!ignore_flags) {
|
|
btrfs_err(fs_info,
|
|
"unrecognized or unsupported super flag 0x%llx",
|
|
btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP);
|
|
ret = -EINVAL;
|
|
} else {
|
|
btrfs_info(fs_info,
|
|
"unrecognized or unsupported super flags: 0x%llx, ignored",
|
|
btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP);
|
|
}
|
|
}
|
|
if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
|
|
btrfs_err(fs_info, "tree_root level too big: %d >= %d",
|
|
btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
|
|
ret = -EINVAL;
|
|
}
|
|
if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
|
|
btrfs_err(fs_info, "chunk_root level too big: %d >= %d",
|
|
btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
|
|
ret = -EINVAL;
|
|
}
|
|
if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
|
|
btrfs_err(fs_info, "log_root level too big: %d >= %d",
|
|
btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Check sectorsize and nodesize first, other check will need it.
|
|
* Check all possible sectorsize(4K, 8K, 16K, 32K, 64K) here.
|
|
*/
|
|
if (!is_power_of_2(sectorsize) || sectorsize < 4096 ||
|
|
sectorsize > BTRFS_MAX_METADATA_BLOCKSIZE) {
|
|
btrfs_err(fs_info, "invalid sectorsize %llu", sectorsize);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* We only support at most two sectorsizes: 4K and PAGE_SIZE.
|
|
*
|
|
* We can support 16K sectorsize with 64K page size without problem,
|
|
* but such sectorsize/pagesize combination doesn't make much sense.
|
|
* 4K will be our future standard, PAGE_SIZE is supported from the very
|
|
* beginning.
|
|
*/
|
|
if (sectorsize > PAGE_SIZE || (sectorsize != SZ_4K && sectorsize != PAGE_SIZE)) {
|
|
btrfs_err(fs_info,
|
|
"sectorsize %llu not yet supported for page size %lu",
|
|
sectorsize, PAGE_SIZE);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
if (!is_power_of_2(nodesize) || nodesize < sectorsize ||
|
|
nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
|
|
btrfs_err(fs_info, "invalid nodesize %llu", nodesize);
|
|
ret = -EINVAL;
|
|
}
|
|
if (nodesize != le32_to_cpu(sb->__unused_leafsize)) {
|
|
btrfs_err(fs_info, "invalid leafsize %u, should be %llu",
|
|
le32_to_cpu(sb->__unused_leafsize), nodesize);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
/* Root alignment check */
|
|
if (!IS_ALIGNED(btrfs_super_root(sb), sectorsize)) {
|
|
btrfs_warn(fs_info, "tree_root block unaligned: %llu",
|
|
btrfs_super_root(sb));
|
|
ret = -EINVAL;
|
|
}
|
|
if (!IS_ALIGNED(btrfs_super_chunk_root(sb), sectorsize)) {
|
|
btrfs_warn(fs_info, "chunk_root block unaligned: %llu",
|
|
btrfs_super_chunk_root(sb));
|
|
ret = -EINVAL;
|
|
}
|
|
if (!IS_ALIGNED(btrfs_super_log_root(sb), sectorsize)) {
|
|
btrfs_warn(fs_info, "log_root block unaligned: %llu",
|
|
btrfs_super_log_root(sb));
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
if (!fs_info->fs_devices->temp_fsid &&
|
|
memcmp(fs_info->fs_devices->fsid, sb->fsid, BTRFS_FSID_SIZE) != 0) {
|
|
btrfs_err(fs_info,
|
|
"superblock fsid doesn't match fsid of fs_devices: %pU != %pU",
|
|
sb->fsid, fs_info->fs_devices->fsid);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
if (memcmp(fs_info->fs_devices->metadata_uuid, btrfs_sb_fsid_ptr(sb),
|
|
BTRFS_FSID_SIZE) != 0) {
|
|
btrfs_err(fs_info,
|
|
"superblock metadata_uuid doesn't match metadata uuid of fs_devices: %pU != %pU",
|
|
btrfs_sb_fsid_ptr(sb), fs_info->fs_devices->metadata_uuid);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
if (memcmp(fs_info->fs_devices->metadata_uuid, sb->dev_item.fsid,
|
|
BTRFS_FSID_SIZE) != 0) {
|
|
btrfs_err(fs_info,
|
|
"dev_item UUID does not match metadata fsid: %pU != %pU",
|
|
fs_info->fs_devices->metadata_uuid, sb->dev_item.fsid);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Artificial requirement for block-group-tree to force newer features
|
|
* (free-space-tree, no-holes) so the test matrix is smaller.
|
|
*/
|
|
if (btrfs_fs_compat_ro(fs_info, BLOCK_GROUP_TREE) &&
|
|
(!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID) ||
|
|
!btrfs_fs_incompat(fs_info, NO_HOLES))) {
|
|
btrfs_err(fs_info,
|
|
"block-group-tree feature requires free-space-tree and no-holes");
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Hint to catch really bogus numbers, bitflips or so, more exact checks are
|
|
* done later
|
|
*/
|
|
if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) {
|
|
btrfs_err(fs_info, "bytes_used is too small %llu",
|
|
btrfs_super_bytes_used(sb));
|
|
ret = -EINVAL;
|
|
}
|
|
if (!is_power_of_2(btrfs_super_stripesize(sb))) {
|
|
btrfs_err(fs_info, "invalid stripesize %u",
|
|
btrfs_super_stripesize(sb));
|
|
ret = -EINVAL;
|
|
}
|
|
if (btrfs_super_num_devices(sb) > (1UL << 31))
|
|
btrfs_warn(fs_info, "suspicious number of devices: %llu",
|
|
btrfs_super_num_devices(sb));
|
|
if (btrfs_super_num_devices(sb) == 0) {
|
|
btrfs_err(fs_info, "number of devices is 0");
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
if (mirror_num >= 0 &&
|
|
btrfs_super_bytenr(sb) != btrfs_sb_offset(mirror_num)) {
|
|
btrfs_err(fs_info, "super offset mismatch %llu != %u",
|
|
btrfs_super_bytenr(sb), BTRFS_SUPER_INFO_OFFSET);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Obvious sys_chunk_array corruptions, it must hold at least one key
|
|
* and one chunk
|
|
*/
|
|
if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
|
|
btrfs_err(fs_info, "system chunk array too big %u > %u",
|
|
btrfs_super_sys_array_size(sb),
|
|
BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
|
|
ret = -EINVAL;
|
|
}
|
|
if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key)
|
|
+ sizeof(struct btrfs_chunk)) {
|
|
btrfs_err(fs_info, "system chunk array too small %u < %zu",
|
|
btrfs_super_sys_array_size(sb),
|
|
sizeof(struct btrfs_disk_key)
|
|
+ sizeof(struct btrfs_chunk));
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* The generation is a global counter, we'll trust it more than the others
|
|
* but it's still possible that it's the one that's wrong.
|
|
*/
|
|
if (btrfs_super_generation(sb) < btrfs_super_chunk_root_generation(sb))
|
|
btrfs_warn(fs_info,
|
|
"suspicious: generation < chunk_root_generation: %llu < %llu",
|
|
btrfs_super_generation(sb),
|
|
btrfs_super_chunk_root_generation(sb));
|
|
if (btrfs_super_generation(sb) < btrfs_super_cache_generation(sb)
|
|
&& btrfs_super_cache_generation(sb) != (u64)-1)
|
|
btrfs_warn(fs_info,
|
|
"suspicious: generation < cache_generation: %llu < %llu",
|
|
btrfs_super_generation(sb),
|
|
btrfs_super_cache_generation(sb));
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Validation of super block at mount time.
|
|
* Some checks already done early at mount time, like csum type and incompat
|
|
* flags will be skipped.
|
|
*/
|
|
static int btrfs_validate_mount_super(struct btrfs_fs_info *fs_info)
|
|
{
|
|
return btrfs_validate_super(fs_info, fs_info->super_copy, 0);
|
|
}
|
|
|
|
/*
|
|
* Validation of super block at write time.
|
|
* Some checks like bytenr check will be skipped as their values will be
|
|
* overwritten soon.
|
|
* Extra checks like csum type and incompat flags will be done here.
|
|
*/
|
|
static int btrfs_validate_write_super(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_super_block *sb)
|
|
{
|
|
int ret;
|
|
|
|
ret = btrfs_validate_super(fs_info, sb, -1);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (!btrfs_supported_super_csum(btrfs_super_csum_type(sb))) {
|
|
ret = -EUCLEAN;
|
|
btrfs_err(fs_info, "invalid csum type, has %u want %u",
|
|
btrfs_super_csum_type(sb), BTRFS_CSUM_TYPE_CRC32);
|
|
goto out;
|
|
}
|
|
if (btrfs_super_incompat_flags(sb) & ~BTRFS_FEATURE_INCOMPAT_SUPP) {
|
|
ret = -EUCLEAN;
|
|
btrfs_err(fs_info,
|
|
"invalid incompat flags, has 0x%llx valid mask 0x%llx",
|
|
btrfs_super_incompat_flags(sb),
|
|
(unsigned long long)BTRFS_FEATURE_INCOMPAT_SUPP);
|
|
goto out;
|
|
}
|
|
out:
|
|
if (ret < 0)
|
|
btrfs_err(fs_info,
|
|
"super block corruption detected before writing it to disk");
|
|
return ret;
|
|
}
|
|
|
|
static int load_super_root(struct btrfs_root *root, u64 bytenr, u64 gen, int level)
|
|
{
|
|
struct btrfs_tree_parent_check check = {
|
|
.level = level,
|
|
.transid = gen,
|
|
.owner_root = btrfs_root_id(root)
|
|
};
|
|
int ret = 0;
|
|
|
|
root->node = read_tree_block(root->fs_info, bytenr, &check);
|
|
if (IS_ERR(root->node)) {
|
|
ret = PTR_ERR(root->node);
|
|
root->node = NULL;
|
|
return ret;
|
|
}
|
|
if (!extent_buffer_uptodate(root->node)) {
|
|
free_extent_buffer(root->node);
|
|
root->node = NULL;
|
|
return -EIO;
|
|
}
|
|
|
|
btrfs_set_root_node(&root->root_item, root->node);
|
|
root->commit_root = btrfs_root_node(root);
|
|
btrfs_set_root_refs(&root->root_item, 1);
|
|
return ret;
|
|
}
|
|
|
|
static int load_important_roots(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_super_block *sb = fs_info->super_copy;
|
|
u64 gen, bytenr;
|
|
int level, ret;
|
|
|
|
bytenr = btrfs_super_root(sb);
|
|
gen = btrfs_super_generation(sb);
|
|
level = btrfs_super_root_level(sb);
|
|
ret = load_super_root(fs_info->tree_root, bytenr, gen, level);
|
|
if (ret) {
|
|
btrfs_warn(fs_info, "couldn't read tree root");
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int __cold init_tree_roots(struct btrfs_fs_info *fs_info)
|
|
{
|
|
int backup_index = find_newest_super_backup(fs_info);
|
|
struct btrfs_super_block *sb = fs_info->super_copy;
|
|
struct btrfs_root *tree_root = fs_info->tree_root;
|
|
bool handle_error = false;
|
|
int ret = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
|
|
if (handle_error) {
|
|
if (!IS_ERR(tree_root->node))
|
|
free_extent_buffer(tree_root->node);
|
|
tree_root->node = NULL;
|
|
|
|
if (!btrfs_test_opt(fs_info, USEBACKUPROOT))
|
|
break;
|
|
|
|
free_root_pointers(fs_info, 0);
|
|
|
|
/*
|
|
* Don't use the log in recovery mode, it won't be
|
|
* valid
|
|
*/
|
|
btrfs_set_super_log_root(sb, 0);
|
|
|
|
btrfs_warn(fs_info, "try to load backup roots slot %d", i);
|
|
ret = read_backup_root(fs_info, i);
|
|
backup_index = ret;
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
ret = load_important_roots(fs_info);
|
|
if (ret) {
|
|
handle_error = true;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* No need to hold btrfs_root::objectid_mutex since the fs
|
|
* hasn't been fully initialised and we are the only user
|
|
*/
|
|
ret = btrfs_init_root_free_objectid(tree_root);
|
|
if (ret < 0) {
|
|
handle_error = true;
|
|
continue;
|
|
}
|
|
|
|
ASSERT(tree_root->free_objectid <= BTRFS_LAST_FREE_OBJECTID);
|
|
|
|
ret = btrfs_read_roots(fs_info);
|
|
if (ret < 0) {
|
|
handle_error = true;
|
|
continue;
|
|
}
|
|
|
|
/* All successful */
|
|
fs_info->generation = btrfs_header_generation(tree_root->node);
|
|
btrfs_set_last_trans_committed(fs_info, fs_info->generation);
|
|
fs_info->last_reloc_trans = 0;
|
|
|
|
/* Always begin writing backup roots after the one being used */
|
|
if (backup_index < 0) {
|
|
fs_info->backup_root_index = 0;
|
|
} else {
|
|
fs_info->backup_root_index = backup_index + 1;
|
|
fs_info->backup_root_index %= BTRFS_NUM_BACKUP_ROOTS;
|
|
}
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void btrfs_init_fs_info(struct btrfs_fs_info *fs_info)
|
|
{
|
|
INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
|
|
INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC);
|
|
INIT_LIST_HEAD(&fs_info->trans_list);
|
|
INIT_LIST_HEAD(&fs_info->dead_roots);
|
|
INIT_LIST_HEAD(&fs_info->delayed_iputs);
|
|
INIT_LIST_HEAD(&fs_info->delalloc_roots);
|
|
INIT_LIST_HEAD(&fs_info->caching_block_groups);
|
|
spin_lock_init(&fs_info->delalloc_root_lock);
|
|
spin_lock_init(&fs_info->trans_lock);
|
|
spin_lock_init(&fs_info->fs_roots_radix_lock);
|
|
spin_lock_init(&fs_info->delayed_iput_lock);
|
|
spin_lock_init(&fs_info->defrag_inodes_lock);
|
|
spin_lock_init(&fs_info->super_lock);
|
|
spin_lock_init(&fs_info->buffer_lock);
|
|
spin_lock_init(&fs_info->unused_bgs_lock);
|
|
spin_lock_init(&fs_info->treelog_bg_lock);
|
|
spin_lock_init(&fs_info->zone_active_bgs_lock);
|
|
spin_lock_init(&fs_info->relocation_bg_lock);
|
|
rwlock_init(&fs_info->tree_mod_log_lock);
|
|
rwlock_init(&fs_info->global_root_lock);
|
|
mutex_init(&fs_info->unused_bg_unpin_mutex);
|
|
mutex_init(&fs_info->reclaim_bgs_lock);
|
|
mutex_init(&fs_info->reloc_mutex);
|
|
mutex_init(&fs_info->delalloc_root_mutex);
|
|
mutex_init(&fs_info->zoned_meta_io_lock);
|
|
mutex_init(&fs_info->zoned_data_reloc_io_lock);
|
|
seqlock_init(&fs_info->profiles_lock);
|
|
|
|
btrfs_lockdep_init_map(fs_info, btrfs_trans_num_writers);
|
|
btrfs_lockdep_init_map(fs_info, btrfs_trans_num_extwriters);
|
|
btrfs_lockdep_init_map(fs_info, btrfs_trans_pending_ordered);
|
|
btrfs_lockdep_init_map(fs_info, btrfs_ordered_extent);
|
|
btrfs_state_lockdep_init_map(fs_info, btrfs_trans_commit_prep,
|
|
BTRFS_LOCKDEP_TRANS_COMMIT_PREP);
|
|
btrfs_state_lockdep_init_map(fs_info, btrfs_trans_unblocked,
|
|
BTRFS_LOCKDEP_TRANS_UNBLOCKED);
|
|
btrfs_state_lockdep_init_map(fs_info, btrfs_trans_super_committed,
|
|
BTRFS_LOCKDEP_TRANS_SUPER_COMMITTED);
|
|
btrfs_state_lockdep_init_map(fs_info, btrfs_trans_completed,
|
|
BTRFS_LOCKDEP_TRANS_COMPLETED);
|
|
|
|
INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
|
|
INIT_LIST_HEAD(&fs_info->space_info);
|
|
INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);
|
|
INIT_LIST_HEAD(&fs_info->unused_bgs);
|
|
INIT_LIST_HEAD(&fs_info->reclaim_bgs);
|
|
INIT_LIST_HEAD(&fs_info->zone_active_bgs);
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
INIT_LIST_HEAD(&fs_info->allocated_roots);
|
|
INIT_LIST_HEAD(&fs_info->allocated_ebs);
|
|
spin_lock_init(&fs_info->eb_leak_lock);
|
|
#endif
|
|
fs_info->mapping_tree = RB_ROOT_CACHED;
|
|
rwlock_init(&fs_info->mapping_tree_lock);
|
|
btrfs_init_block_rsv(&fs_info->global_block_rsv,
|
|
BTRFS_BLOCK_RSV_GLOBAL);
|
|
btrfs_init_block_rsv(&fs_info->trans_block_rsv, BTRFS_BLOCK_RSV_TRANS);
|
|
btrfs_init_block_rsv(&fs_info->chunk_block_rsv, BTRFS_BLOCK_RSV_CHUNK);
|
|
btrfs_init_block_rsv(&fs_info->empty_block_rsv, BTRFS_BLOCK_RSV_EMPTY);
|
|
btrfs_init_block_rsv(&fs_info->delayed_block_rsv,
|
|
BTRFS_BLOCK_RSV_DELOPS);
|
|
btrfs_init_block_rsv(&fs_info->delayed_refs_rsv,
|
|
BTRFS_BLOCK_RSV_DELREFS);
|
|
|
|
atomic_set(&fs_info->async_delalloc_pages, 0);
|
|
atomic_set(&fs_info->defrag_running, 0);
|
|
atomic_set(&fs_info->nr_delayed_iputs, 0);
|
|
atomic64_set(&fs_info->tree_mod_seq, 0);
|
|
fs_info->global_root_tree = RB_ROOT;
|
|
fs_info->max_inline = BTRFS_DEFAULT_MAX_INLINE;
|
|
fs_info->metadata_ratio = 0;
|
|
fs_info->defrag_inodes = RB_ROOT;
|
|
atomic64_set(&fs_info->free_chunk_space, 0);
|
|
fs_info->tree_mod_log = RB_ROOT;
|
|
fs_info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
|
|
btrfs_init_ref_verify(fs_info);
|
|
|
|
fs_info->thread_pool_size = min_t(unsigned long,
|
|
num_online_cpus() + 2, 8);
|
|
|
|
INIT_LIST_HEAD(&fs_info->ordered_roots);
|
|
spin_lock_init(&fs_info->ordered_root_lock);
|
|
|
|
btrfs_init_scrub(fs_info);
|
|
btrfs_init_balance(fs_info);
|
|
btrfs_init_async_reclaim_work(fs_info);
|
|
|
|
rwlock_init(&fs_info->block_group_cache_lock);
|
|
fs_info->block_group_cache_tree = RB_ROOT_CACHED;
|
|
|
|
extent_io_tree_init(fs_info, &fs_info->excluded_extents,
|
|
IO_TREE_FS_EXCLUDED_EXTENTS);
|
|
|
|
mutex_init(&fs_info->ordered_operations_mutex);
|
|
mutex_init(&fs_info->tree_log_mutex);
|
|
mutex_init(&fs_info->chunk_mutex);
|
|
mutex_init(&fs_info->transaction_kthread_mutex);
|
|
mutex_init(&fs_info->cleaner_mutex);
|
|
mutex_init(&fs_info->ro_block_group_mutex);
|
|
init_rwsem(&fs_info->commit_root_sem);
|
|
init_rwsem(&fs_info->cleanup_work_sem);
|
|
init_rwsem(&fs_info->subvol_sem);
|
|
sema_init(&fs_info->uuid_tree_rescan_sem, 1);
|
|
|
|
btrfs_init_dev_replace_locks(fs_info);
|
|
btrfs_init_qgroup(fs_info);
|
|
btrfs_discard_init(fs_info);
|
|
|
|
btrfs_init_free_cluster(&fs_info->meta_alloc_cluster);
|
|
btrfs_init_free_cluster(&fs_info->data_alloc_cluster);
|
|
|
|
init_waitqueue_head(&fs_info->transaction_throttle);
|
|
init_waitqueue_head(&fs_info->transaction_wait);
|
|
init_waitqueue_head(&fs_info->transaction_blocked_wait);
|
|
init_waitqueue_head(&fs_info->async_submit_wait);
|
|
init_waitqueue_head(&fs_info->delayed_iputs_wait);
|
|
|
|
/* Usable values until the real ones are cached from the superblock */
|
|
fs_info->nodesize = 4096;
|
|
fs_info->sectorsize = 4096;
|
|
fs_info->sectorsize_bits = ilog2(4096);
|
|
fs_info->stripesize = 4096;
|
|
|
|
/* Default compress algorithm when user does -o compress */
|
|
fs_info->compress_type = BTRFS_COMPRESS_ZLIB;
|
|
|
|
fs_info->max_extent_size = BTRFS_MAX_EXTENT_SIZE;
|
|
|
|
spin_lock_init(&fs_info->swapfile_pins_lock);
|
|
fs_info->swapfile_pins = RB_ROOT;
|
|
|
|
fs_info->bg_reclaim_threshold = BTRFS_DEFAULT_RECLAIM_THRESH;
|
|
INIT_WORK(&fs_info->reclaim_bgs_work, btrfs_reclaim_bgs_work);
|
|
}
|
|
|
|
static int init_mount_fs_info(struct btrfs_fs_info *fs_info, struct super_block *sb)
|
|
{
|
|
int ret;
|
|
|
|
fs_info->sb = sb;
|
|
/* Temporary fixed values for block size until we read the superblock. */
|
|
sb->s_blocksize = BTRFS_BDEV_BLOCKSIZE;
|
|
sb->s_blocksize_bits = blksize_bits(BTRFS_BDEV_BLOCKSIZE);
|
|
|
|
ret = percpu_counter_init(&fs_info->ordered_bytes, 0, GFP_KERNEL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = percpu_counter_init(&fs_info->evictable_extent_maps, 0, GFP_KERNEL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
spin_lock_init(&fs_info->extent_map_shrinker_lock);
|
|
|
|
ret = percpu_counter_init(&fs_info->dirty_metadata_bytes, 0, GFP_KERNEL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
fs_info->dirty_metadata_batch = PAGE_SIZE *
|
|
(1 + ilog2(nr_cpu_ids));
|
|
|
|
ret = percpu_counter_init(&fs_info->delalloc_bytes, 0, GFP_KERNEL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = percpu_counter_init(&fs_info->dev_replace.bio_counter, 0,
|
|
GFP_KERNEL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root),
|
|
GFP_KERNEL);
|
|
if (!fs_info->delayed_root)
|
|
return -ENOMEM;
|
|
btrfs_init_delayed_root(fs_info->delayed_root);
|
|
|
|
if (sb_rdonly(sb))
|
|
set_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state);
|
|
if (btrfs_test_opt(fs_info, IGNOREMETACSUMS))
|
|
set_bit(BTRFS_FS_STATE_SKIP_META_CSUMS, &fs_info->fs_state);
|
|
|
|
return btrfs_alloc_stripe_hash_table(fs_info);
|
|
}
|
|
|
|
static int btrfs_uuid_rescan_kthread(void *data)
|
|
{
|
|
struct btrfs_fs_info *fs_info = data;
|
|
int ret;
|
|
|
|
/*
|
|
* 1st step is to iterate through the existing UUID tree and
|
|
* to delete all entries that contain outdated data.
|
|
* 2nd step is to add all missing entries to the UUID tree.
|
|
*/
|
|
ret = btrfs_uuid_tree_iterate(fs_info);
|
|
if (ret < 0) {
|
|
if (ret != -EINTR)
|
|
btrfs_warn(fs_info, "iterating uuid_tree failed %d",
|
|
ret);
|
|
up(&fs_info->uuid_tree_rescan_sem);
|
|
return ret;
|
|
}
|
|
return btrfs_uuid_scan_kthread(data);
|
|
}
|
|
|
|
static int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct task_struct *task;
|
|
|
|
down(&fs_info->uuid_tree_rescan_sem);
|
|
task = kthread_run(btrfs_uuid_rescan_kthread, fs_info, "btrfs-uuid");
|
|
if (IS_ERR(task)) {
|
|
/* fs_info->update_uuid_tree_gen remains 0 in all error case */
|
|
btrfs_warn(fs_info, "failed to start uuid_rescan task");
|
|
up(&fs_info->uuid_tree_rescan_sem);
|
|
return PTR_ERR(task);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
|
|
{
|
|
u64 root_objectid = 0;
|
|
struct btrfs_root *gang[8];
|
|
int ret = 0;
|
|
|
|
while (1) {
|
|
unsigned int found;
|
|
|
|
spin_lock(&fs_info->fs_roots_radix_lock);
|
|
found = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
|
|
(void **)gang, root_objectid,
|
|
ARRAY_SIZE(gang));
|
|
if (!found) {
|
|
spin_unlock(&fs_info->fs_roots_radix_lock);
|
|
break;
|
|
}
|
|
root_objectid = btrfs_root_id(gang[found - 1]) + 1;
|
|
|
|
for (int i = 0; i < found; i++) {
|
|
/* Avoid to grab roots in dead_roots. */
|
|
if (btrfs_root_refs(&gang[i]->root_item) == 0) {
|
|
gang[i] = NULL;
|
|
continue;
|
|
}
|
|
/* Grab all the search result for later use. */
|
|
gang[i] = btrfs_grab_root(gang[i]);
|
|
}
|
|
spin_unlock(&fs_info->fs_roots_radix_lock);
|
|
|
|
for (int i = 0; i < found; i++) {
|
|
if (!gang[i])
|
|
continue;
|
|
root_objectid = btrfs_root_id(gang[i]);
|
|
/*
|
|
* Continue to release the remaining roots after the first
|
|
* error without cleanup and preserve the first error
|
|
* for the return.
|
|
*/
|
|
if (!ret)
|
|
ret = btrfs_orphan_cleanup(gang[i]);
|
|
btrfs_put_root(gang[i]);
|
|
}
|
|
if (ret)
|
|
break;
|
|
|
|
root_objectid++;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Mounting logic specific to read-write file systems. Shared by open_ctree
|
|
* and btrfs_remount when remounting from read-only to read-write.
|
|
*/
|
|
int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info)
|
|
{
|
|
int ret;
|
|
const bool cache_opt = btrfs_test_opt(fs_info, SPACE_CACHE);
|
|
bool rebuild_free_space_tree = false;
|
|
|
|
if (btrfs_test_opt(fs_info, CLEAR_CACHE) &&
|
|
btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
|
|
if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2))
|
|
btrfs_warn(fs_info,
|
|
"'clear_cache' option is ignored with extent tree v2");
|
|
else
|
|
rebuild_free_space_tree = true;
|
|
} else if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE) &&
|
|
!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID)) {
|
|
btrfs_warn(fs_info, "free space tree is invalid");
|
|
rebuild_free_space_tree = true;
|
|
}
|
|
|
|
if (rebuild_free_space_tree) {
|
|
btrfs_info(fs_info, "rebuilding free space tree");
|
|
ret = btrfs_rebuild_free_space_tree(fs_info);
|
|
if (ret) {
|
|
btrfs_warn(fs_info,
|
|
"failed to rebuild free space tree: %d", ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE) &&
|
|
!btrfs_test_opt(fs_info, FREE_SPACE_TREE)) {
|
|
btrfs_info(fs_info, "disabling free space tree");
|
|
ret = btrfs_delete_free_space_tree(fs_info);
|
|
if (ret) {
|
|
btrfs_warn(fs_info,
|
|
"failed to disable free space tree: %d", ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* btrfs_find_orphan_roots() is responsible for finding all the dead
|
|
* roots (with 0 refs), flag them with BTRFS_ROOT_DEAD_TREE and load
|
|
* them into the fs_info->fs_roots_radix tree. This must be done before
|
|
* calling btrfs_orphan_cleanup() on the tree root. If we don't do it
|
|
* first, then btrfs_orphan_cleanup() will delete a dead root's orphan
|
|
* item before the root's tree is deleted - this means that if we unmount
|
|
* or crash before the deletion completes, on the next mount we will not
|
|
* delete what remains of the tree because the orphan item does not
|
|
* exists anymore, which is what tells us we have a pending deletion.
|
|
*/
|
|
ret = btrfs_find_orphan_roots(fs_info);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = btrfs_cleanup_fs_roots(fs_info);
|
|
if (ret)
|
|
goto out;
|
|
|
|
down_read(&fs_info->cleanup_work_sem);
|
|
if ((ret = btrfs_orphan_cleanup(fs_info->fs_root)) ||
|
|
(ret = btrfs_orphan_cleanup(fs_info->tree_root))) {
|
|
up_read(&fs_info->cleanup_work_sem);
|
|
goto out;
|
|
}
|
|
up_read(&fs_info->cleanup_work_sem);
|
|
|
|
mutex_lock(&fs_info->cleaner_mutex);
|
|
ret = btrfs_recover_relocation(fs_info);
|
|
mutex_unlock(&fs_info->cleaner_mutex);
|
|
if (ret < 0) {
|
|
btrfs_warn(fs_info, "failed to recover relocation: %d", ret);
|
|
goto out;
|
|
}
|
|
|
|
if (btrfs_test_opt(fs_info, FREE_SPACE_TREE) &&
|
|
!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
|
|
btrfs_info(fs_info, "creating free space tree");
|
|
ret = btrfs_create_free_space_tree(fs_info);
|
|
if (ret) {
|
|
btrfs_warn(fs_info,
|
|
"failed to create free space tree: %d", ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (cache_opt != btrfs_free_space_cache_v1_active(fs_info)) {
|
|
ret = btrfs_set_free_space_cache_v1_active(fs_info, cache_opt);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
ret = btrfs_resume_balance_async(fs_info);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = btrfs_resume_dev_replace_async(fs_info);
|
|
if (ret) {
|
|
btrfs_warn(fs_info, "failed to resume dev_replace");
|
|
goto out;
|
|
}
|
|
|
|
btrfs_qgroup_rescan_resume(fs_info);
|
|
|
|
if (!fs_info->uuid_root) {
|
|
btrfs_info(fs_info, "creating UUID tree");
|
|
ret = btrfs_create_uuid_tree(fs_info);
|
|
if (ret) {
|
|
btrfs_warn(fs_info,
|
|
"failed to create the UUID tree %d", ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Do various sanity and dependency checks of different features.
|
|
*
|
|
* @is_rw_mount: If the mount is read-write.
|
|
*
|
|
* This is the place for less strict checks (like for subpage or artificial
|
|
* feature dependencies).
|
|
*
|
|
* For strict checks or possible corruption detection, see
|
|
* btrfs_validate_super().
|
|
*
|
|
* This should be called after btrfs_parse_options(), as some mount options
|
|
* (space cache related) can modify on-disk format like free space tree and
|
|
* screw up certain feature dependencies.
|
|
*/
|
|
int btrfs_check_features(struct btrfs_fs_info *fs_info, bool is_rw_mount)
|
|
{
|
|
struct btrfs_super_block *disk_super = fs_info->super_copy;
|
|
u64 incompat = btrfs_super_incompat_flags(disk_super);
|
|
const u64 compat_ro = btrfs_super_compat_ro_flags(disk_super);
|
|
const u64 compat_ro_unsupp = (compat_ro & ~BTRFS_FEATURE_COMPAT_RO_SUPP);
|
|
|
|
if (incompat & ~BTRFS_FEATURE_INCOMPAT_SUPP) {
|
|
btrfs_err(fs_info,
|
|
"cannot mount because of unknown incompat features (0x%llx)",
|
|
incompat);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Runtime limitation for mixed block groups. */
|
|
if ((incompat & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) &&
|
|
(fs_info->sectorsize != fs_info->nodesize)) {
|
|
btrfs_err(fs_info,
|
|
"unequal nodesize/sectorsize (%u != %u) are not allowed for mixed block groups",
|
|
fs_info->nodesize, fs_info->sectorsize);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Mixed backref is an always-enabled feature. */
|
|
incompat |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
|
|
|
|
/* Set compression related flags just in case. */
|
|
if (fs_info->compress_type == BTRFS_COMPRESS_LZO)
|
|
incompat |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO;
|
|
else if (fs_info->compress_type == BTRFS_COMPRESS_ZSTD)
|
|
incompat |= BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD;
|
|
|
|
/*
|
|
* An ancient flag, which should really be marked deprecated.
|
|
* Such runtime limitation doesn't really need a incompat flag.
|
|
*/
|
|
if (btrfs_super_nodesize(disk_super) > PAGE_SIZE)
|
|
incompat |= BTRFS_FEATURE_INCOMPAT_BIG_METADATA;
|
|
|
|
if (compat_ro_unsupp && is_rw_mount) {
|
|
btrfs_err(fs_info,
|
|
"cannot mount read-write because of unknown compat_ro features (0x%llx)",
|
|
compat_ro);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* We have unsupported RO compat features, although RO mounted, we
|
|
* should not cause any metadata writes, including log replay.
|
|
* Or we could screw up whatever the new feature requires.
|
|
*/
|
|
if (compat_ro_unsupp && btrfs_super_log_root(disk_super) &&
|
|
!btrfs_test_opt(fs_info, NOLOGREPLAY)) {
|
|
btrfs_err(fs_info,
|
|
"cannot replay dirty log with unsupported compat_ro features (0x%llx), try rescue=nologreplay",
|
|
compat_ro);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Artificial limitations for block group tree, to force
|
|
* block-group-tree to rely on no-holes and free-space-tree.
|
|
*/
|
|
if (btrfs_fs_compat_ro(fs_info, BLOCK_GROUP_TREE) &&
|
|
(!btrfs_fs_incompat(fs_info, NO_HOLES) ||
|
|
!btrfs_test_opt(fs_info, FREE_SPACE_TREE))) {
|
|
btrfs_err(fs_info,
|
|
"block-group-tree feature requires no-holes and free-space-tree features");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Subpage runtime limitation on v1 cache.
|
|
*
|
|
* V1 space cache still has some hard codeed PAGE_SIZE usage, while
|
|
* we're already defaulting to v2 cache, no need to bother v1 as it's
|
|
* going to be deprecated anyway.
|
|
*/
|
|
if (fs_info->sectorsize < PAGE_SIZE && btrfs_test_opt(fs_info, SPACE_CACHE)) {
|
|
btrfs_warn(fs_info,
|
|
"v1 space cache is not supported for page size %lu with sectorsize %u",
|
|
PAGE_SIZE, fs_info->sectorsize);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* This can be called by remount, we need to protect the super block. */
|
|
spin_lock(&fs_info->super_lock);
|
|
btrfs_set_super_incompat_flags(disk_super, incompat);
|
|
spin_unlock(&fs_info->super_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_devices,
|
|
const char *options)
|
|
{
|
|
u32 sectorsize;
|
|
u32 nodesize;
|
|
u32 stripesize;
|
|
u64 generation;
|
|
u16 csum_type;
|
|
struct btrfs_super_block *disk_super;
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
|
|
struct btrfs_root *tree_root;
|
|
struct btrfs_root *chunk_root;
|
|
int ret;
|
|
int level;
|
|
|
|
ret = init_mount_fs_info(fs_info, sb);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
/* These need to be init'ed before we start creating inodes and such. */
|
|
tree_root = btrfs_alloc_root(fs_info, BTRFS_ROOT_TREE_OBJECTID,
|
|
GFP_KERNEL);
|
|
fs_info->tree_root = tree_root;
|
|
chunk_root = btrfs_alloc_root(fs_info, BTRFS_CHUNK_TREE_OBJECTID,
|
|
GFP_KERNEL);
|
|
fs_info->chunk_root = chunk_root;
|
|
if (!tree_root || !chunk_root) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
ret = btrfs_init_btree_inode(sb);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
invalidate_bdev(fs_devices->latest_dev->bdev);
|
|
|
|
/*
|
|
* Read super block and check the signature bytes only
|
|
*/
|
|
disk_super = btrfs_read_dev_super(fs_devices->latest_dev->bdev);
|
|
if (IS_ERR(disk_super)) {
|
|
ret = PTR_ERR(disk_super);
|
|
goto fail_alloc;
|
|
}
|
|
|
|
btrfs_info(fs_info, "first mount of filesystem %pU", disk_super->fsid);
|
|
/*
|
|
* Verify the type first, if that or the checksum value are
|
|
* corrupted, we'll find out
|
|
*/
|
|
csum_type = btrfs_super_csum_type(disk_super);
|
|
if (!btrfs_supported_super_csum(csum_type)) {
|
|
btrfs_err(fs_info, "unsupported checksum algorithm: %u",
|
|
csum_type);
|
|
ret = -EINVAL;
|
|
btrfs_release_disk_super(disk_super);
|
|
goto fail_alloc;
|
|
}
|
|
|
|
fs_info->csum_size = btrfs_super_csum_size(disk_super);
|
|
|
|
ret = btrfs_init_csum_hash(fs_info, csum_type);
|
|
if (ret) {
|
|
btrfs_release_disk_super(disk_super);
|
|
goto fail_alloc;
|
|
}
|
|
|
|
/*
|
|
* We want to check superblock checksum, the type is stored inside.
|
|
* Pass the whole disk block of size BTRFS_SUPER_INFO_SIZE (4k).
|
|
*/
|
|
if (btrfs_check_super_csum(fs_info, disk_super)) {
|
|
btrfs_err(fs_info, "superblock checksum mismatch");
|
|
ret = -EINVAL;
|
|
btrfs_release_disk_super(disk_super);
|
|
goto fail_alloc;
|
|
}
|
|
|
|
/*
|
|
* super_copy is zeroed at allocation time and we never touch the
|
|
* following bytes up to INFO_SIZE, the checksum is calculated from
|
|
* the whole block of INFO_SIZE
|
|
*/
|
|
memcpy(fs_info->super_copy, disk_super, sizeof(*fs_info->super_copy));
|
|
btrfs_release_disk_super(disk_super);
|
|
|
|
disk_super = fs_info->super_copy;
|
|
|
|
memcpy(fs_info->super_for_commit, fs_info->super_copy,
|
|
sizeof(*fs_info->super_for_commit));
|
|
|
|
ret = btrfs_validate_mount_super(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "superblock contains fatal errors");
|
|
ret = -EINVAL;
|
|
goto fail_alloc;
|
|
}
|
|
|
|
if (!btrfs_super_root(disk_super)) {
|
|
btrfs_err(fs_info, "invalid superblock tree root bytenr");
|
|
ret = -EINVAL;
|
|
goto fail_alloc;
|
|
}
|
|
|
|
/* check FS state, whether FS is broken. */
|
|
if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_ERROR)
|
|
WRITE_ONCE(fs_info->fs_error, -EUCLEAN);
|
|
|
|
/* Set up fs_info before parsing mount options */
|
|
nodesize = btrfs_super_nodesize(disk_super);
|
|
sectorsize = btrfs_super_sectorsize(disk_super);
|
|
stripesize = sectorsize;
|
|
fs_info->dirty_metadata_batch = nodesize * (1 + ilog2(nr_cpu_ids));
|
|
fs_info->delalloc_batch = sectorsize * 512 * (1 + ilog2(nr_cpu_ids));
|
|
|
|
fs_info->nodesize = nodesize;
|
|
fs_info->sectorsize = sectorsize;
|
|
fs_info->sectorsize_bits = ilog2(sectorsize);
|
|
fs_info->csums_per_leaf = BTRFS_MAX_ITEM_SIZE(fs_info) / fs_info->csum_size;
|
|
fs_info->stripesize = stripesize;
|
|
|
|
/*
|
|
* Handle the space caching options appropriately now that we have the
|
|
* super block loaded and validated.
|
|
*/
|
|
btrfs_set_free_space_cache_settings(fs_info);
|
|
|
|
if (!btrfs_check_options(fs_info, &fs_info->mount_opt, sb->s_flags)) {
|
|
ret = -EINVAL;
|
|
goto fail_alloc;
|
|
}
|
|
|
|
ret = btrfs_check_features(fs_info, !sb_rdonly(sb));
|
|
if (ret < 0)
|
|
goto fail_alloc;
|
|
|
|
/*
|
|
* At this point our mount options are validated, if we set ->max_inline
|
|
* to something non-standard make sure we truncate it to sectorsize.
|
|
*/
|
|
fs_info->max_inline = min_t(u64, fs_info->max_inline, fs_info->sectorsize);
|
|
|
|
if (sectorsize < PAGE_SIZE) {
|
|
struct btrfs_subpage_info *subpage_info;
|
|
|
|
btrfs_warn(fs_info,
|
|
"read-write for sector size %u with page size %lu is experimental",
|
|
sectorsize, PAGE_SIZE);
|
|
subpage_info = kzalloc(sizeof(*subpage_info), GFP_KERNEL);
|
|
if (!subpage_info) {
|
|
ret = -ENOMEM;
|
|
goto fail_alloc;
|
|
}
|
|
btrfs_init_subpage_info(subpage_info, sectorsize);
|
|
fs_info->subpage_info = subpage_info;
|
|
}
|
|
|
|
ret = btrfs_init_workqueues(fs_info);
|
|
if (ret)
|
|
goto fail_sb_buffer;
|
|
|
|
sb->s_bdi->ra_pages *= btrfs_super_num_devices(disk_super);
|
|
sb->s_bdi->ra_pages = max(sb->s_bdi->ra_pages, SZ_4M / PAGE_SIZE);
|
|
|
|
/* Update the values for the current filesystem. */
|
|
sb->s_blocksize = sectorsize;
|
|
sb->s_blocksize_bits = blksize_bits(sectorsize);
|
|
memcpy(&sb->s_uuid, fs_info->fs_devices->fsid, BTRFS_FSID_SIZE);
|
|
|
|
mutex_lock(&fs_info->chunk_mutex);
|
|
ret = btrfs_read_sys_array(fs_info);
|
|
mutex_unlock(&fs_info->chunk_mutex);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to read the system array: %d", ret);
|
|
goto fail_sb_buffer;
|
|
}
|
|
|
|
generation = btrfs_super_chunk_root_generation(disk_super);
|
|
level = btrfs_super_chunk_root_level(disk_super);
|
|
ret = load_super_root(chunk_root, btrfs_super_chunk_root(disk_super),
|
|
generation, level);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to read chunk root");
|
|
goto fail_tree_roots;
|
|
}
|
|
|
|
read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
|
|
offsetof(struct btrfs_header, chunk_tree_uuid),
|
|
BTRFS_UUID_SIZE);
|
|
|
|
ret = btrfs_read_chunk_tree(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to read chunk tree: %d", ret);
|
|
goto fail_tree_roots;
|
|
}
|
|
|
|
/*
|
|
* At this point we know all the devices that make this filesystem,
|
|
* including the seed devices but we don't know yet if the replace
|
|
* target is required. So free devices that are not part of this
|
|
* filesystem but skip the replace target device which is checked
|
|
* below in btrfs_init_dev_replace().
|
|
*/
|
|
btrfs_free_extra_devids(fs_devices);
|
|
if (!fs_devices->latest_dev->bdev) {
|
|
btrfs_err(fs_info, "failed to read devices");
|
|
ret = -EIO;
|
|
goto fail_tree_roots;
|
|
}
|
|
|
|
ret = init_tree_roots(fs_info);
|
|
if (ret)
|
|
goto fail_tree_roots;
|
|
|
|
/*
|
|
* Get zone type information of zoned block devices. This will also
|
|
* handle emulation of a zoned filesystem if a regular device has the
|
|
* zoned incompat feature flag set.
|
|
*/
|
|
ret = btrfs_get_dev_zone_info_all_devices(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info,
|
|
"zoned: failed to read device zone info: %d", ret);
|
|
goto fail_block_groups;
|
|
}
|
|
|
|
/*
|
|
* If we have a uuid root and we're not being told to rescan we need to
|
|
* check the generation here so we can set the
|
|
* BTRFS_FS_UPDATE_UUID_TREE_GEN bit. Otherwise we could commit the
|
|
* transaction during a balance or the log replay without updating the
|
|
* uuid generation, and then if we crash we would rescan the uuid tree,
|
|
* even though it was perfectly fine.
|
|
*/
|
|
if (fs_info->uuid_root && !btrfs_test_opt(fs_info, RESCAN_UUID_TREE) &&
|
|
fs_info->generation == btrfs_super_uuid_tree_generation(disk_super))
|
|
set_bit(BTRFS_FS_UPDATE_UUID_TREE_GEN, &fs_info->flags);
|
|
|
|
ret = btrfs_verify_dev_extents(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info,
|
|
"failed to verify dev extents against chunks: %d",
|
|
ret);
|
|
goto fail_block_groups;
|
|
}
|
|
ret = btrfs_recover_balance(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to recover balance: %d", ret);
|
|
goto fail_block_groups;
|
|
}
|
|
|
|
ret = btrfs_init_dev_stats(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to init dev_stats: %d", ret);
|
|
goto fail_block_groups;
|
|
}
|
|
|
|
ret = btrfs_init_dev_replace(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to init dev_replace: %d", ret);
|
|
goto fail_block_groups;
|
|
}
|
|
|
|
ret = btrfs_check_zoned_mode(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to initialize zoned mode: %d",
|
|
ret);
|
|
goto fail_block_groups;
|
|
}
|
|
|
|
ret = btrfs_sysfs_add_fsid(fs_devices);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to init sysfs fsid interface: %d",
|
|
ret);
|
|
goto fail_block_groups;
|
|
}
|
|
|
|
ret = btrfs_sysfs_add_mounted(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to init sysfs interface: %d", ret);
|
|
goto fail_fsdev_sysfs;
|
|
}
|
|
|
|
ret = btrfs_init_space_info(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to initialize space info: %d", ret);
|
|
goto fail_sysfs;
|
|
}
|
|
|
|
ret = btrfs_read_block_groups(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to read block groups: %d", ret);
|
|
goto fail_sysfs;
|
|
}
|
|
|
|
btrfs_free_zone_cache(fs_info);
|
|
|
|
btrfs_check_active_zone_reservation(fs_info);
|
|
|
|
if (!sb_rdonly(sb) && fs_info->fs_devices->missing_devices &&
|
|
!btrfs_check_rw_degradable(fs_info, NULL)) {
|
|
btrfs_warn(fs_info,
|
|
"writable mount is not allowed due to too many missing devices");
|
|
ret = -EINVAL;
|
|
goto fail_sysfs;
|
|
}
|
|
|
|
fs_info->cleaner_kthread = kthread_run(cleaner_kthread, fs_info,
|
|
"btrfs-cleaner");
|
|
if (IS_ERR(fs_info->cleaner_kthread)) {
|
|
ret = PTR_ERR(fs_info->cleaner_kthread);
|
|
goto fail_sysfs;
|
|
}
|
|
|
|
fs_info->transaction_kthread = kthread_run(transaction_kthread,
|
|
tree_root,
|
|
"btrfs-transaction");
|
|
if (IS_ERR(fs_info->transaction_kthread)) {
|
|
ret = PTR_ERR(fs_info->transaction_kthread);
|
|
goto fail_cleaner;
|
|
}
|
|
|
|
ret = btrfs_read_qgroup_config(fs_info);
|
|
if (ret)
|
|
goto fail_trans_kthread;
|
|
|
|
if (btrfs_build_ref_tree(fs_info))
|
|
btrfs_err(fs_info, "couldn't build ref tree");
|
|
|
|
/* do not make disk changes in broken FS or nologreplay is given */
|
|
if (btrfs_super_log_root(disk_super) != 0 &&
|
|
!btrfs_test_opt(fs_info, NOLOGREPLAY)) {
|
|
btrfs_info(fs_info, "start tree-log replay");
|
|
ret = btrfs_replay_log(fs_info, fs_devices);
|
|
if (ret)
|
|
goto fail_qgroup;
|
|
}
|
|
|
|
fs_info->fs_root = btrfs_get_fs_root(fs_info, BTRFS_FS_TREE_OBJECTID, true);
|
|
if (IS_ERR(fs_info->fs_root)) {
|
|
ret = PTR_ERR(fs_info->fs_root);
|
|
btrfs_warn(fs_info, "failed to read fs tree: %d", ret);
|
|
fs_info->fs_root = NULL;
|
|
goto fail_qgroup;
|
|
}
|
|
|
|
if (sb_rdonly(sb))
|
|
return 0;
|
|
|
|
ret = btrfs_start_pre_rw_mount(fs_info);
|
|
if (ret) {
|
|
close_ctree(fs_info);
|
|
return ret;
|
|
}
|
|
btrfs_discard_resume(fs_info);
|
|
|
|
if (fs_info->uuid_root &&
|
|
(btrfs_test_opt(fs_info, RESCAN_UUID_TREE) ||
|
|
fs_info->generation != btrfs_super_uuid_tree_generation(disk_super))) {
|
|
btrfs_info(fs_info, "checking UUID tree");
|
|
ret = btrfs_check_uuid_tree(fs_info);
|
|
if (ret) {
|
|
btrfs_warn(fs_info,
|
|
"failed to check the UUID tree: %d", ret);
|
|
close_ctree(fs_info);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
set_bit(BTRFS_FS_OPEN, &fs_info->flags);
|
|
|
|
/* Kick the cleaner thread so it'll start deleting snapshots. */
|
|
if (test_bit(BTRFS_FS_UNFINISHED_DROPS, &fs_info->flags))
|
|
wake_up_process(fs_info->cleaner_kthread);
|
|
|
|
return 0;
|
|
|
|
fail_qgroup:
|
|
btrfs_free_qgroup_config(fs_info);
|
|
fail_trans_kthread:
|
|
kthread_stop(fs_info->transaction_kthread);
|
|
btrfs_cleanup_transaction(fs_info);
|
|
btrfs_free_fs_roots(fs_info);
|
|
fail_cleaner:
|
|
kthread_stop(fs_info->cleaner_kthread);
|
|
|
|
/*
|
|
* make sure we're done with the btree inode before we stop our
|
|
* kthreads
|
|
*/
|
|
filemap_write_and_wait(fs_info->btree_inode->i_mapping);
|
|
|
|
fail_sysfs:
|
|
btrfs_sysfs_remove_mounted(fs_info);
|
|
|
|
fail_fsdev_sysfs:
|
|
btrfs_sysfs_remove_fsid(fs_info->fs_devices);
|
|
|
|
fail_block_groups:
|
|
btrfs_put_block_group_cache(fs_info);
|
|
|
|
fail_tree_roots:
|
|
if (fs_info->data_reloc_root)
|
|
btrfs_drop_and_free_fs_root(fs_info, fs_info->data_reloc_root);
|
|
free_root_pointers(fs_info, true);
|
|
invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
|
|
|
|
fail_sb_buffer:
|
|
btrfs_stop_all_workers(fs_info);
|
|
btrfs_free_block_groups(fs_info);
|
|
fail_alloc:
|
|
btrfs_mapping_tree_free(fs_info);
|
|
|
|
iput(fs_info->btree_inode);
|
|
fail:
|
|
btrfs_close_devices(fs_info->fs_devices);
|
|
ASSERT(ret < 0);
|
|
return ret;
|
|
}
|
|
ALLOW_ERROR_INJECTION(open_ctree, ERRNO);
|
|
|
|
static void btrfs_end_super_write(struct bio *bio)
|
|
{
|
|
struct btrfs_device *device = bio->bi_private;
|
|
struct folio_iter fi;
|
|
|
|
bio_for_each_folio_all(fi, bio) {
|
|
if (bio->bi_status) {
|
|
btrfs_warn_rl_in_rcu(device->fs_info,
|
|
"lost super block write due to IO error on %s (%d)",
|
|
btrfs_dev_name(device),
|
|
blk_status_to_errno(bio->bi_status));
|
|
btrfs_dev_stat_inc_and_print(device,
|
|
BTRFS_DEV_STAT_WRITE_ERRS);
|
|
/* Ensure failure if the primary sb fails. */
|
|
if (bio->bi_opf & REQ_FUA)
|
|
atomic_add(BTRFS_SUPER_PRIMARY_WRITE_ERROR,
|
|
&device->sb_write_errors);
|
|
else
|
|
atomic_inc(&device->sb_write_errors);
|
|
}
|
|
folio_unlock(fi.folio);
|
|
folio_put(fi.folio);
|
|
}
|
|
|
|
bio_put(bio);
|
|
}
|
|
|
|
struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
|
|
int copy_num, bool drop_cache)
|
|
{
|
|
struct btrfs_super_block *super;
|
|
struct page *page;
|
|
u64 bytenr, bytenr_orig;
|
|
struct address_space *mapping = bdev->bd_mapping;
|
|
int ret;
|
|
|
|
bytenr_orig = btrfs_sb_offset(copy_num);
|
|
ret = btrfs_sb_log_location_bdev(bdev, copy_num, READ, &bytenr);
|
|
if (ret == -ENOENT)
|
|
return ERR_PTR(-EINVAL);
|
|
else if (ret)
|
|
return ERR_PTR(ret);
|
|
|
|
if (bytenr + BTRFS_SUPER_INFO_SIZE >= bdev_nr_bytes(bdev))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (drop_cache) {
|
|
/* This should only be called with the primary sb. */
|
|
ASSERT(copy_num == 0);
|
|
|
|
/*
|
|
* Drop the page of the primary superblock, so later read will
|
|
* always read from the device.
|
|
*/
|
|
invalidate_inode_pages2_range(mapping,
|
|
bytenr >> PAGE_SHIFT,
|
|
(bytenr + BTRFS_SUPER_INFO_SIZE) >> PAGE_SHIFT);
|
|
}
|
|
|
|
page = read_cache_page_gfp(mapping, bytenr >> PAGE_SHIFT, GFP_NOFS);
|
|
if (IS_ERR(page))
|
|
return ERR_CAST(page);
|
|
|
|
super = page_address(page);
|
|
if (btrfs_super_magic(super) != BTRFS_MAGIC) {
|
|
btrfs_release_disk_super(super);
|
|
return ERR_PTR(-ENODATA);
|
|
}
|
|
|
|
if (btrfs_super_bytenr(super) != bytenr_orig) {
|
|
btrfs_release_disk_super(super);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
return super;
|
|
}
|
|
|
|
|
|
struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev)
|
|
{
|
|
struct btrfs_super_block *super, *latest = NULL;
|
|
int i;
|
|
u64 transid = 0;
|
|
|
|
/* we would like to check all the supers, but that would make
|
|
* a btrfs mount succeed after a mkfs from a different FS.
|
|
* So, we need to add a special mount option to scan for
|
|
* later supers, using BTRFS_SUPER_MIRROR_MAX instead
|
|
*/
|
|
for (i = 0; i < 1; i++) {
|
|
super = btrfs_read_dev_one_super(bdev, i, false);
|
|
if (IS_ERR(super))
|
|
continue;
|
|
|
|
if (!latest || btrfs_super_generation(super) > transid) {
|
|
if (latest)
|
|
btrfs_release_disk_super(super);
|
|
|
|
latest = super;
|
|
transid = btrfs_super_generation(super);
|
|
}
|
|
}
|
|
|
|
return super;
|
|
}
|
|
|
|
/*
|
|
* Write superblock @sb to the @device. Do not wait for completion, all the
|
|
* folios we use for writing are locked.
|
|
*
|
|
* Write @max_mirrors copies of the superblock, where 0 means default that fit
|
|
* the expected device size at commit time. Note that max_mirrors must be
|
|
* same for write and wait phases.
|
|
*
|
|
* Return number of errors when folio is not found or submission fails.
|
|
*/
|
|
static int write_dev_supers(struct btrfs_device *device,
|
|
struct btrfs_super_block *sb, int max_mirrors)
|
|
{
|
|
struct btrfs_fs_info *fs_info = device->fs_info;
|
|
struct address_space *mapping = device->bdev->bd_mapping;
|
|
SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
|
|
int i;
|
|
int ret;
|
|
u64 bytenr, bytenr_orig;
|
|
|
|
atomic_set(&device->sb_write_errors, 0);
|
|
|
|
if (max_mirrors == 0)
|
|
max_mirrors = BTRFS_SUPER_MIRROR_MAX;
|
|
|
|
shash->tfm = fs_info->csum_shash;
|
|
|
|
for (i = 0; i < max_mirrors; i++) {
|
|
struct folio *folio;
|
|
struct bio *bio;
|
|
struct btrfs_super_block *disk_super;
|
|
size_t offset;
|
|
|
|
bytenr_orig = btrfs_sb_offset(i);
|
|
ret = btrfs_sb_log_location(device, i, WRITE, &bytenr);
|
|
if (ret == -ENOENT) {
|
|
continue;
|
|
} else if (ret < 0) {
|
|
btrfs_err(device->fs_info,
|
|
"couldn't get super block location for mirror %d",
|
|
i);
|
|
atomic_inc(&device->sb_write_errors);
|
|
continue;
|
|
}
|
|
if (bytenr + BTRFS_SUPER_INFO_SIZE >=
|
|
device->commit_total_bytes)
|
|
break;
|
|
|
|
btrfs_set_super_bytenr(sb, bytenr_orig);
|
|
|
|
crypto_shash_digest(shash, (const char *)sb + BTRFS_CSUM_SIZE,
|
|
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE,
|
|
sb->csum);
|
|
|
|
folio = __filemap_get_folio(mapping, bytenr >> PAGE_SHIFT,
|
|
FGP_LOCK | FGP_ACCESSED | FGP_CREAT,
|
|
GFP_NOFS);
|
|
if (IS_ERR(folio)) {
|
|
btrfs_err(device->fs_info,
|
|
"couldn't get super block page for bytenr %llu",
|
|
bytenr);
|
|
atomic_inc(&device->sb_write_errors);
|
|
continue;
|
|
}
|
|
ASSERT(folio_order(folio) == 0);
|
|
|
|
offset = offset_in_folio(folio, bytenr);
|
|
disk_super = folio_address(folio) + offset;
|
|
memcpy(disk_super, sb, BTRFS_SUPER_INFO_SIZE);
|
|
|
|
/*
|
|
* Directly use bios here instead of relying on the page cache
|
|
* to do I/O, so we don't lose the ability to do integrity
|
|
* checking.
|
|
*/
|
|
bio = bio_alloc(device->bdev, 1,
|
|
REQ_OP_WRITE | REQ_SYNC | REQ_META | REQ_PRIO,
|
|
GFP_NOFS);
|
|
bio->bi_iter.bi_sector = bytenr >> SECTOR_SHIFT;
|
|
bio->bi_private = device;
|
|
bio->bi_end_io = btrfs_end_super_write;
|
|
bio_add_folio_nofail(bio, folio, BTRFS_SUPER_INFO_SIZE, offset);
|
|
|
|
/*
|
|
* We FUA only the first super block. The others we allow to
|
|
* go down lazy and there's a short window where the on-disk
|
|
* copies might still contain the older version.
|
|
*/
|
|
if (i == 0 && !btrfs_test_opt(device->fs_info, NOBARRIER))
|
|
bio->bi_opf |= REQ_FUA;
|
|
submit_bio(bio);
|
|
|
|
if (btrfs_advance_sb_log(device, i))
|
|
atomic_inc(&device->sb_write_errors);
|
|
}
|
|
return atomic_read(&device->sb_write_errors) < i ? 0 : -1;
|
|
}
|
|
|
|
/*
|
|
* Wait for write completion of superblocks done by write_dev_supers,
|
|
* @max_mirrors same for write and wait phases.
|
|
*
|
|
* Return -1 if primary super block write failed or when there were no super block
|
|
* copies written. Otherwise 0.
|
|
*/
|
|
static int wait_dev_supers(struct btrfs_device *device, int max_mirrors)
|
|
{
|
|
int i;
|
|
int errors = 0;
|
|
bool primary_failed = false;
|
|
int ret;
|
|
u64 bytenr;
|
|
|
|
if (max_mirrors == 0)
|
|
max_mirrors = BTRFS_SUPER_MIRROR_MAX;
|
|
|
|
for (i = 0; i < max_mirrors; i++) {
|
|
struct folio *folio;
|
|
|
|
ret = btrfs_sb_log_location(device, i, READ, &bytenr);
|
|
if (ret == -ENOENT) {
|
|
break;
|
|
} else if (ret < 0) {
|
|
errors++;
|
|
if (i == 0)
|
|
primary_failed = true;
|
|
continue;
|
|
}
|
|
if (bytenr + BTRFS_SUPER_INFO_SIZE >=
|
|
device->commit_total_bytes)
|
|
break;
|
|
|
|
folio = filemap_get_folio(device->bdev->bd_mapping,
|
|
bytenr >> PAGE_SHIFT);
|
|
/* If the folio has been removed, then we know it completed. */
|
|
if (IS_ERR(folio))
|
|
continue;
|
|
ASSERT(folio_order(folio) == 0);
|
|
|
|
/* Folio will be unlocked once the write completes. */
|
|
folio_wait_locked(folio);
|
|
folio_put(folio);
|
|
}
|
|
|
|
errors += atomic_read(&device->sb_write_errors);
|
|
if (errors >= BTRFS_SUPER_PRIMARY_WRITE_ERROR)
|
|
primary_failed = true;
|
|
if (primary_failed) {
|
|
btrfs_err(device->fs_info, "error writing primary super block to device %llu",
|
|
device->devid);
|
|
return -1;
|
|
}
|
|
|
|
return errors < i ? 0 : -1;
|
|
}
|
|
|
|
/*
|
|
* endio for the write_dev_flush, this will wake anyone waiting
|
|
* for the barrier when it is done
|
|
*/
|
|
static void btrfs_end_empty_barrier(struct bio *bio)
|
|
{
|
|
bio_uninit(bio);
|
|
complete(bio->bi_private);
|
|
}
|
|
|
|
/*
|
|
* Submit a flush request to the device if it supports it. Error handling is
|
|
* done in the waiting counterpart.
|
|
*/
|
|
static void write_dev_flush(struct btrfs_device *device)
|
|
{
|
|
struct bio *bio = &device->flush_bio;
|
|
|
|
device->last_flush_error = BLK_STS_OK;
|
|
|
|
bio_init(bio, device->bdev, NULL, 0,
|
|
REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH);
|
|
bio->bi_end_io = btrfs_end_empty_barrier;
|
|
init_completion(&device->flush_wait);
|
|
bio->bi_private = &device->flush_wait;
|
|
submit_bio(bio);
|
|
set_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state);
|
|
}
|
|
|
|
/*
|
|
* If the flush bio has been submitted by write_dev_flush, wait for it.
|
|
* Return true for any error, and false otherwise.
|
|
*/
|
|
static bool wait_dev_flush(struct btrfs_device *device)
|
|
{
|
|
struct bio *bio = &device->flush_bio;
|
|
|
|
if (!test_and_clear_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state))
|
|
return false;
|
|
|
|
wait_for_completion_io(&device->flush_wait);
|
|
|
|
if (bio->bi_status) {
|
|
device->last_flush_error = bio->bi_status;
|
|
btrfs_dev_stat_inc_and_print(device, BTRFS_DEV_STAT_FLUSH_ERRS);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* send an empty flush down to each device in parallel,
|
|
* then wait for them
|
|
*/
|
|
static int barrier_all_devices(struct btrfs_fs_info *info)
|
|
{
|
|
struct list_head *head;
|
|
struct btrfs_device *dev;
|
|
int errors_wait = 0;
|
|
|
|
lockdep_assert_held(&info->fs_devices->device_list_mutex);
|
|
/* send down all the barriers */
|
|
head = &info->fs_devices->devices;
|
|
list_for_each_entry(dev, head, dev_list) {
|
|
if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
|
|
continue;
|
|
if (!dev->bdev)
|
|
continue;
|
|
if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
|
|
!test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
|
|
continue;
|
|
|
|
write_dev_flush(dev);
|
|
}
|
|
|
|
/* wait for all the barriers */
|
|
list_for_each_entry(dev, head, dev_list) {
|
|
if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
|
|
continue;
|
|
if (!dev->bdev) {
|
|
errors_wait++;
|
|
continue;
|
|
}
|
|
if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
|
|
!test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
|
|
continue;
|
|
|
|
if (wait_dev_flush(dev))
|
|
errors_wait++;
|
|
}
|
|
|
|
/*
|
|
* Checks last_flush_error of disks in order to determine the device
|
|
* state.
|
|
*/
|
|
if (errors_wait && !btrfs_check_rw_degradable(info, NULL))
|
|
return -EIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags)
|
|
{
|
|
int raid_type;
|
|
int min_tolerated = INT_MAX;
|
|
|
|
if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0 ||
|
|
(flags & BTRFS_AVAIL_ALLOC_BIT_SINGLE))
|
|
min_tolerated = min_t(int, min_tolerated,
|
|
btrfs_raid_array[BTRFS_RAID_SINGLE].
|
|
tolerated_failures);
|
|
|
|
for (raid_type = 0; raid_type < BTRFS_NR_RAID_TYPES; raid_type++) {
|
|
if (raid_type == BTRFS_RAID_SINGLE)
|
|
continue;
|
|
if (!(flags & btrfs_raid_array[raid_type].bg_flag))
|
|
continue;
|
|
min_tolerated = min_t(int, min_tolerated,
|
|
btrfs_raid_array[raid_type].
|
|
tolerated_failures);
|
|
}
|
|
|
|
if (min_tolerated == INT_MAX) {
|
|
pr_warn("BTRFS: unknown raid flag: %llu", flags);
|
|
min_tolerated = 0;
|
|
}
|
|
|
|
return min_tolerated;
|
|
}
|
|
|
|
int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors)
|
|
{
|
|
struct list_head *head;
|
|
struct btrfs_device *dev;
|
|
struct btrfs_super_block *sb;
|
|
struct btrfs_dev_item *dev_item;
|
|
int ret;
|
|
int do_barriers;
|
|
int max_errors;
|
|
int total_errors = 0;
|
|
u64 flags;
|
|
|
|
do_barriers = !btrfs_test_opt(fs_info, NOBARRIER);
|
|
|
|
/*
|
|
* max_mirrors == 0 indicates we're from commit_transaction,
|
|
* not from fsync where the tree roots in fs_info have not
|
|
* been consistent on disk.
|
|
*/
|
|
if (max_mirrors == 0)
|
|
backup_super_roots(fs_info);
|
|
|
|
sb = fs_info->super_for_commit;
|
|
dev_item = &sb->dev_item;
|
|
|
|
mutex_lock(&fs_info->fs_devices->device_list_mutex);
|
|
head = &fs_info->fs_devices->devices;
|
|
max_errors = btrfs_super_num_devices(fs_info->super_copy) - 1;
|
|
|
|
if (do_barriers) {
|
|
ret = barrier_all_devices(fs_info);
|
|
if (ret) {
|
|
mutex_unlock(
|
|
&fs_info->fs_devices->device_list_mutex);
|
|
btrfs_handle_fs_error(fs_info, ret,
|
|
"errors while submitting device barriers.");
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
list_for_each_entry(dev, head, dev_list) {
|
|
if (!dev->bdev) {
|
|
total_errors++;
|
|
continue;
|
|
}
|
|
if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
|
|
!test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
|
|
continue;
|
|
|
|
btrfs_set_stack_device_generation(dev_item, 0);
|
|
btrfs_set_stack_device_type(dev_item, dev->type);
|
|
btrfs_set_stack_device_id(dev_item, dev->devid);
|
|
btrfs_set_stack_device_total_bytes(dev_item,
|
|
dev->commit_total_bytes);
|
|
btrfs_set_stack_device_bytes_used(dev_item,
|
|
dev->commit_bytes_used);
|
|
btrfs_set_stack_device_io_align(dev_item, dev->io_align);
|
|
btrfs_set_stack_device_io_width(dev_item, dev->io_width);
|
|
btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
|
|
memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
|
|
memcpy(dev_item->fsid, dev->fs_devices->metadata_uuid,
|
|
BTRFS_FSID_SIZE);
|
|
|
|
flags = btrfs_super_flags(sb);
|
|
btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
|
|
|
|
ret = btrfs_validate_write_super(fs_info, sb);
|
|
if (ret < 0) {
|
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
|
btrfs_handle_fs_error(fs_info, -EUCLEAN,
|
|
"unexpected superblock corruption detected");
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
ret = write_dev_supers(dev, sb, max_mirrors);
|
|
if (ret)
|
|
total_errors++;
|
|
}
|
|
if (total_errors > max_errors) {
|
|
btrfs_err(fs_info, "%d errors while writing supers",
|
|
total_errors);
|
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
|
|
|
/* FUA is masked off if unsupported and can't be the reason */
|
|
btrfs_handle_fs_error(fs_info, -EIO,
|
|
"%d errors while writing supers",
|
|
total_errors);
|
|
return -EIO;
|
|
}
|
|
|
|
total_errors = 0;
|
|
list_for_each_entry(dev, head, dev_list) {
|
|
if (!dev->bdev)
|
|
continue;
|
|
if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
|
|
!test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
|
|
continue;
|
|
|
|
ret = wait_dev_supers(dev, max_mirrors);
|
|
if (ret)
|
|
total_errors++;
|
|
}
|
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
|
if (total_errors > max_errors) {
|
|
btrfs_handle_fs_error(fs_info, -EIO,
|
|
"%d errors while writing supers",
|
|
total_errors);
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Drop a fs root from the radix tree and free it. */
|
|
void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_root *root)
|
|
{
|
|
bool drop_ref = false;
|
|
|
|
spin_lock(&fs_info->fs_roots_radix_lock);
|
|
radix_tree_delete(&fs_info->fs_roots_radix,
|
|
(unsigned long)btrfs_root_id(root));
|
|
if (test_and_clear_bit(BTRFS_ROOT_IN_RADIX, &root->state))
|
|
drop_ref = true;
|
|
spin_unlock(&fs_info->fs_roots_radix_lock);
|
|
|
|
if (BTRFS_FS_ERROR(fs_info)) {
|
|
ASSERT(root->log_root == NULL);
|
|
if (root->reloc_root) {
|
|
btrfs_put_root(root->reloc_root);
|
|
root->reloc_root = NULL;
|
|
}
|
|
}
|
|
|
|
if (drop_ref)
|
|
btrfs_put_root(root);
|
|
}
|
|
|
|
int btrfs_commit_super(struct btrfs_fs_info *fs_info)
|
|
{
|
|
mutex_lock(&fs_info->cleaner_mutex);
|
|
btrfs_run_delayed_iputs(fs_info);
|
|
mutex_unlock(&fs_info->cleaner_mutex);
|
|
wake_up_process(fs_info->cleaner_kthread);
|
|
|
|
/* wait until ongoing cleanup work done */
|
|
down_write(&fs_info->cleanup_work_sem);
|
|
up_write(&fs_info->cleanup_work_sem);
|
|
|
|
return btrfs_commit_current_transaction(fs_info->tree_root);
|
|
}
|
|
|
|
static void warn_about_uncommitted_trans(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_transaction *trans;
|
|
struct btrfs_transaction *tmp;
|
|
bool found = false;
|
|
|
|
/*
|
|
* This function is only called at the very end of close_ctree(),
|
|
* thus no other running transaction, no need to take trans_lock.
|
|
*/
|
|
ASSERT(test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags));
|
|
list_for_each_entry_safe(trans, tmp, &fs_info->trans_list, list) {
|
|
struct extent_state *cached = NULL;
|
|
u64 dirty_bytes = 0;
|
|
u64 cur = 0;
|
|
u64 found_start;
|
|
u64 found_end;
|
|
|
|
found = true;
|
|
while (find_first_extent_bit(&trans->dirty_pages, cur,
|
|
&found_start, &found_end, EXTENT_DIRTY, &cached)) {
|
|
dirty_bytes += found_end + 1 - found_start;
|
|
cur = found_end + 1;
|
|
}
|
|
btrfs_warn(fs_info,
|
|
"transaction %llu (with %llu dirty metadata bytes) is not committed",
|
|
trans->transid, dirty_bytes);
|
|
btrfs_cleanup_one_transaction(trans, fs_info);
|
|
|
|
if (trans == fs_info->running_transaction)
|
|
fs_info->running_transaction = NULL;
|
|
list_del_init(&trans->list);
|
|
|
|
btrfs_put_transaction(trans);
|
|
trace_btrfs_transaction_commit(fs_info);
|
|
}
|
|
ASSERT(!found);
|
|
}
|
|
|
|
void __cold close_ctree(struct btrfs_fs_info *fs_info)
|
|
{
|
|
int ret;
|
|
|
|
set_bit(BTRFS_FS_CLOSING_START, &fs_info->flags);
|
|
|
|
/*
|
|
* If we had UNFINISHED_DROPS we could still be processing them, so
|
|
* clear that bit and wake up relocation so it can stop.
|
|
* We must do this before stopping the block group reclaim task, because
|
|
* at btrfs_relocate_block_group() we wait for this bit, and after the
|
|
* wait we stop with -EINTR if btrfs_fs_closing() returns non-zero - we
|
|
* have just set BTRFS_FS_CLOSING_START, so btrfs_fs_closing() will
|
|
* return 1.
|
|
*/
|
|
btrfs_wake_unfinished_drop(fs_info);
|
|
|
|
/*
|
|
* We may have the reclaim task running and relocating a data block group,
|
|
* in which case it may create delayed iputs. So stop it before we park
|
|
* the cleaner kthread otherwise we can get new delayed iputs after
|
|
* parking the cleaner, and that can make the async reclaim task to hang
|
|
* if it's waiting for delayed iputs to complete, since the cleaner is
|
|
* parked and can not run delayed iputs - this will make us hang when
|
|
* trying to stop the async reclaim task.
|
|
*/
|
|
cancel_work_sync(&fs_info->reclaim_bgs_work);
|
|
/*
|
|
* We don't want the cleaner to start new transactions, add more delayed
|
|
* iputs, etc. while we're closing. We can't use kthread_stop() yet
|
|
* because that frees the task_struct, and the transaction kthread might
|
|
* still try to wake up the cleaner.
|
|
*/
|
|
kthread_park(fs_info->cleaner_kthread);
|
|
|
|
/* wait for the qgroup rescan worker to stop */
|
|
btrfs_qgroup_wait_for_completion(fs_info, false);
|
|
|
|
/* wait for the uuid_scan task to finish */
|
|
down(&fs_info->uuid_tree_rescan_sem);
|
|
/* avoid complains from lockdep et al., set sem back to initial state */
|
|
up(&fs_info->uuid_tree_rescan_sem);
|
|
|
|
/* pause restriper - we want to resume on mount */
|
|
btrfs_pause_balance(fs_info);
|
|
|
|
btrfs_dev_replace_suspend_for_unmount(fs_info);
|
|
|
|
btrfs_scrub_cancel(fs_info);
|
|
|
|
/* wait for any defraggers to finish */
|
|
wait_event(fs_info->transaction_wait,
|
|
(atomic_read(&fs_info->defrag_running) == 0));
|
|
|
|
/* clear out the rbtree of defraggable inodes */
|
|
btrfs_cleanup_defrag_inodes(fs_info);
|
|
|
|
/*
|
|
* After we parked the cleaner kthread, ordered extents may have
|
|
* completed and created new delayed iputs. If one of the async reclaim
|
|
* tasks is running and in the RUN_DELAYED_IPUTS flush state, then we
|
|
* can hang forever trying to stop it, because if a delayed iput is
|
|
* added after it ran btrfs_run_delayed_iputs() and before it called
|
|
* btrfs_wait_on_delayed_iputs(), it will hang forever since there is
|
|
* no one else to run iputs.
|
|
*
|
|
* So wait for all ongoing ordered extents to complete and then run
|
|
* delayed iputs. This works because once we reach this point no one
|
|
* can either create new ordered extents nor create delayed iputs
|
|
* through some other means.
|
|
*
|
|
* Also note that btrfs_wait_ordered_roots() is not safe here, because
|
|
* it waits for BTRFS_ORDERED_COMPLETE to be set on an ordered extent,
|
|
* but the delayed iput for the respective inode is made only when doing
|
|
* the final btrfs_put_ordered_extent() (which must happen at
|
|
* btrfs_finish_ordered_io() when we are unmounting).
|
|
*/
|
|
btrfs_flush_workqueue(fs_info->endio_write_workers);
|
|
/* Ordered extents for free space inodes. */
|
|
btrfs_flush_workqueue(fs_info->endio_freespace_worker);
|
|
btrfs_run_delayed_iputs(fs_info);
|
|
|
|
cancel_work_sync(&fs_info->async_reclaim_work);
|
|
cancel_work_sync(&fs_info->async_data_reclaim_work);
|
|
cancel_work_sync(&fs_info->preempt_reclaim_work);
|
|
|
|
/* Cancel or finish ongoing discard work */
|
|
btrfs_discard_cleanup(fs_info);
|
|
|
|
if (!sb_rdonly(fs_info->sb)) {
|
|
/*
|
|
* The cleaner kthread is stopped, so do one final pass over
|
|
* unused block groups.
|
|
*/
|
|
btrfs_delete_unused_bgs(fs_info);
|
|
|
|
/*
|
|
* There might be existing delayed inode workers still running
|
|
* and holding an empty delayed inode item. We must wait for
|
|
* them to complete first because they can create a transaction.
|
|
* This happens when someone calls btrfs_balance_delayed_items()
|
|
* and then a transaction commit runs the same delayed nodes
|
|
* before any delayed worker has done something with the nodes.
|
|
* We must wait for any worker here and not at transaction
|
|
* commit time since that could cause a deadlock.
|
|
* This is a very rare case.
|
|
*/
|
|
btrfs_flush_workqueue(fs_info->delayed_workers);
|
|
|
|
ret = btrfs_commit_super(fs_info);
|
|
if (ret)
|
|
btrfs_err(fs_info, "commit super ret %d", ret);
|
|
}
|
|
|
|
if (BTRFS_FS_ERROR(fs_info))
|
|
btrfs_error_commit_super(fs_info);
|
|
|
|
kthread_stop(fs_info->transaction_kthread);
|
|
kthread_stop(fs_info->cleaner_kthread);
|
|
|
|
ASSERT(list_empty(&fs_info->delayed_iputs));
|
|
set_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags);
|
|
|
|
if (btrfs_check_quota_leak(fs_info)) {
|
|
WARN_ON(IS_ENABLED(CONFIG_BTRFS_DEBUG));
|
|
btrfs_err(fs_info, "qgroup reserved space leaked");
|
|
}
|
|
|
|
btrfs_free_qgroup_config(fs_info);
|
|
ASSERT(list_empty(&fs_info->delalloc_roots));
|
|
|
|
if (percpu_counter_sum(&fs_info->delalloc_bytes)) {
|
|
btrfs_info(fs_info, "at unmount delalloc count %lld",
|
|
percpu_counter_sum(&fs_info->delalloc_bytes));
|
|
}
|
|
|
|
if (percpu_counter_sum(&fs_info->ordered_bytes))
|
|
btrfs_info(fs_info, "at unmount dio bytes count %lld",
|
|
percpu_counter_sum(&fs_info->ordered_bytes));
|
|
|
|
btrfs_sysfs_remove_mounted(fs_info);
|
|
btrfs_sysfs_remove_fsid(fs_info->fs_devices);
|
|
|
|
btrfs_put_block_group_cache(fs_info);
|
|
|
|
/*
|
|
* we must make sure there is not any read request to
|
|
* submit after we stopping all workers.
|
|
*/
|
|
invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
|
|
btrfs_stop_all_workers(fs_info);
|
|
|
|
/* We shouldn't have any transaction open at this point */
|
|
warn_about_uncommitted_trans(fs_info);
|
|
|
|
clear_bit(BTRFS_FS_OPEN, &fs_info->flags);
|
|
free_root_pointers(fs_info, true);
|
|
btrfs_free_fs_roots(fs_info);
|
|
|
|
/*
|
|
* We must free the block groups after dropping the fs_roots as we could
|
|
* have had an IO error and have left over tree log blocks that aren't
|
|
* cleaned up until the fs roots are freed. This makes the block group
|
|
* accounting appear to be wrong because there's pending reserved bytes,
|
|
* so make sure we do the block group cleanup afterwards.
|
|
*/
|
|
btrfs_free_block_groups(fs_info);
|
|
|
|
iput(fs_info->btree_inode);
|
|
|
|
btrfs_mapping_tree_free(fs_info);
|
|
btrfs_close_devices(fs_info->fs_devices);
|
|
}
|
|
|
|
void btrfs_mark_buffer_dirty(struct btrfs_trans_handle *trans,
|
|
struct extent_buffer *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = buf->fs_info;
|
|
u64 transid = btrfs_header_generation(buf);
|
|
|
|
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
|
|
/*
|
|
* This is a fast path so only do this check if we have sanity tests
|
|
* enabled. Normal people shouldn't be using unmapped buffers as dirty
|
|
* outside of the sanity tests.
|
|
*/
|
|
if (unlikely(test_bit(EXTENT_BUFFER_UNMAPPED, &buf->bflags)))
|
|
return;
|
|
#endif
|
|
/* This is an active transaction (its state < TRANS_STATE_UNBLOCKED). */
|
|
ASSERT(trans->transid == fs_info->generation);
|
|
btrfs_assert_tree_write_locked(buf);
|
|
if (unlikely(transid != fs_info->generation)) {
|
|
btrfs_abort_transaction(trans, -EUCLEAN);
|
|
btrfs_crit(fs_info,
|
|
"dirty buffer transid mismatch, logical %llu found transid %llu running transid %llu",
|
|
buf->start, transid, fs_info->generation);
|
|
}
|
|
set_extent_buffer_dirty(buf);
|
|
}
|
|
|
|
static void __btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info,
|
|
int flush_delayed)
|
|
{
|
|
/*
|
|
* looks as though older kernels can get into trouble with
|
|
* this code, they end up stuck in balance_dirty_pages forever
|
|
*/
|
|
int ret;
|
|
|
|
if (current->flags & PF_MEMALLOC)
|
|
return;
|
|
|
|
if (flush_delayed)
|
|
btrfs_balance_delayed_items(fs_info);
|
|
|
|
ret = __percpu_counter_compare(&fs_info->dirty_metadata_bytes,
|
|
BTRFS_DIRTY_METADATA_THRESH,
|
|
fs_info->dirty_metadata_batch);
|
|
if (ret > 0) {
|
|
balance_dirty_pages_ratelimited(fs_info->btree_inode->i_mapping);
|
|
}
|
|
}
|
|
|
|
void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info)
|
|
{
|
|
__btrfs_btree_balance_dirty(fs_info, 1);
|
|
}
|
|
|
|
void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info)
|
|
{
|
|
__btrfs_btree_balance_dirty(fs_info, 0);
|
|
}
|
|
|
|
static void btrfs_error_commit_super(struct btrfs_fs_info *fs_info)
|
|
{
|
|
/* cleanup FS via transaction */
|
|
btrfs_cleanup_transaction(fs_info);
|
|
|
|
mutex_lock(&fs_info->cleaner_mutex);
|
|
btrfs_run_delayed_iputs(fs_info);
|
|
mutex_unlock(&fs_info->cleaner_mutex);
|
|
|
|
down_write(&fs_info->cleanup_work_sem);
|
|
up_write(&fs_info->cleanup_work_sem);
|
|
}
|
|
|
|
static void btrfs_drop_all_logs(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *gang[8];
|
|
u64 root_objectid = 0;
|
|
int ret;
|
|
|
|
spin_lock(&fs_info->fs_roots_radix_lock);
|
|
while ((ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
|
|
(void **)gang, root_objectid,
|
|
ARRAY_SIZE(gang))) != 0) {
|
|
int i;
|
|
|
|
for (i = 0; i < ret; i++)
|
|
gang[i] = btrfs_grab_root(gang[i]);
|
|
spin_unlock(&fs_info->fs_roots_radix_lock);
|
|
|
|
for (i = 0; i < ret; i++) {
|
|
if (!gang[i])
|
|
continue;
|
|
root_objectid = btrfs_root_id(gang[i]);
|
|
btrfs_free_log(NULL, gang[i]);
|
|
btrfs_put_root(gang[i]);
|
|
}
|
|
root_objectid++;
|
|
spin_lock(&fs_info->fs_roots_radix_lock);
|
|
}
|
|
spin_unlock(&fs_info->fs_roots_radix_lock);
|
|
btrfs_free_log_root_tree(NULL, fs_info);
|
|
}
|
|
|
|
static void btrfs_destroy_ordered_extents(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_ordered_extent *ordered;
|
|
|
|
spin_lock(&root->ordered_extent_lock);
|
|
/*
|
|
* This will just short circuit the ordered completion stuff which will
|
|
* make sure the ordered extent gets properly cleaned up.
|
|
*/
|
|
list_for_each_entry(ordered, &root->ordered_extents,
|
|
root_extent_list)
|
|
set_bit(BTRFS_ORDERED_IOERR, &ordered->flags);
|
|
spin_unlock(&root->ordered_extent_lock);
|
|
}
|
|
|
|
static void btrfs_destroy_all_ordered_extents(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *root;
|
|
LIST_HEAD(splice);
|
|
|
|
spin_lock(&fs_info->ordered_root_lock);
|
|
list_splice_init(&fs_info->ordered_roots, &splice);
|
|
while (!list_empty(&splice)) {
|
|
root = list_first_entry(&splice, struct btrfs_root,
|
|
ordered_root);
|
|
list_move_tail(&root->ordered_root,
|
|
&fs_info->ordered_roots);
|
|
|
|
spin_unlock(&fs_info->ordered_root_lock);
|
|
btrfs_destroy_ordered_extents(root);
|
|
|
|
cond_resched();
|
|
spin_lock(&fs_info->ordered_root_lock);
|
|
}
|
|
spin_unlock(&fs_info->ordered_root_lock);
|
|
|
|
/*
|
|
* We need this here because if we've been flipped read-only we won't
|
|
* get sync() from the umount, so we need to make sure any ordered
|
|
* extents that haven't had their dirty pages IO start writeout yet
|
|
* actually get run and error out properly.
|
|
*/
|
|
btrfs_wait_ordered_roots(fs_info, U64_MAX, NULL);
|
|
}
|
|
|
|
static void btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct rb_node *node;
|
|
struct btrfs_delayed_ref_root *delayed_refs = &trans->delayed_refs;
|
|
struct btrfs_delayed_ref_node *ref;
|
|
|
|
spin_lock(&delayed_refs->lock);
|
|
while ((node = rb_first_cached(&delayed_refs->href_root)) != NULL) {
|
|
struct btrfs_delayed_ref_head *head;
|
|
struct rb_node *n;
|
|
bool pin_bytes = false;
|
|
|
|
head = rb_entry(node, struct btrfs_delayed_ref_head,
|
|
href_node);
|
|
if (btrfs_delayed_ref_lock(delayed_refs, head))
|
|
continue;
|
|
|
|
spin_lock(&head->lock);
|
|
while ((n = rb_first_cached(&head->ref_tree)) != NULL) {
|
|
ref = rb_entry(n, struct btrfs_delayed_ref_node,
|
|
ref_node);
|
|
rb_erase_cached(&ref->ref_node, &head->ref_tree);
|
|
RB_CLEAR_NODE(&ref->ref_node);
|
|
if (!list_empty(&ref->add_list))
|
|
list_del(&ref->add_list);
|
|
atomic_dec(&delayed_refs->num_entries);
|
|
btrfs_put_delayed_ref(ref);
|
|
btrfs_delayed_refs_rsv_release(fs_info, 1, 0);
|
|
}
|
|
if (head->must_insert_reserved)
|
|
pin_bytes = true;
|
|
btrfs_free_delayed_extent_op(head->extent_op);
|
|
btrfs_delete_ref_head(delayed_refs, head);
|
|
spin_unlock(&head->lock);
|
|
spin_unlock(&delayed_refs->lock);
|
|
mutex_unlock(&head->mutex);
|
|
|
|
if (pin_bytes) {
|
|
struct btrfs_block_group *cache;
|
|
|
|
cache = btrfs_lookup_block_group(fs_info, head->bytenr);
|
|
BUG_ON(!cache);
|
|
|
|
spin_lock(&cache->space_info->lock);
|
|
spin_lock(&cache->lock);
|
|
cache->pinned += head->num_bytes;
|
|
btrfs_space_info_update_bytes_pinned(fs_info,
|
|
cache->space_info, head->num_bytes);
|
|
cache->reserved -= head->num_bytes;
|
|
cache->space_info->bytes_reserved -= head->num_bytes;
|
|
spin_unlock(&cache->lock);
|
|
spin_unlock(&cache->space_info->lock);
|
|
|
|
btrfs_put_block_group(cache);
|
|
|
|
btrfs_error_unpin_extent_range(fs_info, head->bytenr,
|
|
head->bytenr + head->num_bytes - 1);
|
|
}
|
|
btrfs_cleanup_ref_head_accounting(fs_info, delayed_refs, head);
|
|
btrfs_put_delayed_ref_head(head);
|
|
cond_resched();
|
|
spin_lock(&delayed_refs->lock);
|
|
}
|
|
btrfs_qgroup_destroy_extent_records(trans);
|
|
|
|
spin_unlock(&delayed_refs->lock);
|
|
}
|
|
|
|
static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_inode *btrfs_inode;
|
|
LIST_HEAD(splice);
|
|
|
|
spin_lock(&root->delalloc_lock);
|
|
list_splice_init(&root->delalloc_inodes, &splice);
|
|
|
|
while (!list_empty(&splice)) {
|
|
struct inode *inode = NULL;
|
|
btrfs_inode = list_first_entry(&splice, struct btrfs_inode,
|
|
delalloc_inodes);
|
|
btrfs_del_delalloc_inode(btrfs_inode);
|
|
spin_unlock(&root->delalloc_lock);
|
|
|
|
/*
|
|
* Make sure we get a live inode and that it'll not disappear
|
|
* meanwhile.
|
|
*/
|
|
inode = igrab(&btrfs_inode->vfs_inode);
|
|
if (inode) {
|
|
unsigned int nofs_flag;
|
|
|
|
nofs_flag = memalloc_nofs_save();
|
|
invalidate_inode_pages2(inode->i_mapping);
|
|
memalloc_nofs_restore(nofs_flag);
|
|
iput(inode);
|
|
}
|
|
spin_lock(&root->delalloc_lock);
|
|
}
|
|
spin_unlock(&root->delalloc_lock);
|
|
}
|
|
|
|
static void btrfs_destroy_all_delalloc_inodes(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *root;
|
|
LIST_HEAD(splice);
|
|
|
|
spin_lock(&fs_info->delalloc_root_lock);
|
|
list_splice_init(&fs_info->delalloc_roots, &splice);
|
|
while (!list_empty(&splice)) {
|
|
root = list_first_entry(&splice, struct btrfs_root,
|
|
delalloc_root);
|
|
root = btrfs_grab_root(root);
|
|
BUG_ON(!root);
|
|
spin_unlock(&fs_info->delalloc_root_lock);
|
|
|
|
btrfs_destroy_delalloc_inodes(root);
|
|
btrfs_put_root(root);
|
|
|
|
spin_lock(&fs_info->delalloc_root_lock);
|
|
}
|
|
spin_unlock(&fs_info->delalloc_root_lock);
|
|
}
|
|
|
|
static void btrfs_destroy_marked_extents(struct btrfs_fs_info *fs_info,
|
|
struct extent_io_tree *dirty_pages,
|
|
int mark)
|
|
{
|
|
struct extent_buffer *eb;
|
|
u64 start = 0;
|
|
u64 end;
|
|
|
|
while (find_first_extent_bit(dirty_pages, start, &start, &end,
|
|
mark, NULL)) {
|
|
clear_extent_bits(dirty_pages, start, end, mark);
|
|
while (start <= end) {
|
|
eb = find_extent_buffer(fs_info, start);
|
|
start += fs_info->nodesize;
|
|
if (!eb)
|
|
continue;
|
|
|
|
btrfs_tree_lock(eb);
|
|
wait_on_extent_buffer_writeback(eb);
|
|
btrfs_clear_buffer_dirty(NULL, eb);
|
|
btrfs_tree_unlock(eb);
|
|
|
|
free_extent_buffer_stale(eb);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void btrfs_destroy_pinned_extent(struct btrfs_fs_info *fs_info,
|
|
struct extent_io_tree *unpin)
|
|
{
|
|
u64 start;
|
|
u64 end;
|
|
|
|
while (1) {
|
|
struct extent_state *cached_state = NULL;
|
|
|
|
/*
|
|
* The btrfs_finish_extent_commit() may get the same range as
|
|
* ours between find_first_extent_bit and clear_extent_dirty.
|
|
* Hence, hold the unused_bg_unpin_mutex to avoid double unpin
|
|
* the same extent range.
|
|
*/
|
|
mutex_lock(&fs_info->unused_bg_unpin_mutex);
|
|
if (!find_first_extent_bit(unpin, 0, &start, &end,
|
|
EXTENT_DIRTY, &cached_state)) {
|
|
mutex_unlock(&fs_info->unused_bg_unpin_mutex);
|
|
break;
|
|
}
|
|
|
|
clear_extent_dirty(unpin, start, end, &cached_state);
|
|
free_extent_state(cached_state);
|
|
btrfs_error_unpin_extent_range(fs_info, start, end);
|
|
mutex_unlock(&fs_info->unused_bg_unpin_mutex);
|
|
cond_resched();
|
|
}
|
|
}
|
|
|
|
static void btrfs_cleanup_bg_io(struct btrfs_block_group *cache)
|
|
{
|
|
struct inode *inode;
|
|
|
|
inode = cache->io_ctl.inode;
|
|
if (inode) {
|
|
unsigned int nofs_flag;
|
|
|
|
nofs_flag = memalloc_nofs_save();
|
|
invalidate_inode_pages2(inode->i_mapping);
|
|
memalloc_nofs_restore(nofs_flag);
|
|
|
|
BTRFS_I(inode)->generation = 0;
|
|
cache->io_ctl.inode = NULL;
|
|
iput(inode);
|
|
}
|
|
ASSERT(cache->io_ctl.pages == NULL);
|
|
btrfs_put_block_group(cache);
|
|
}
|
|
|
|
void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *cur_trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_block_group *cache;
|
|
|
|
spin_lock(&cur_trans->dirty_bgs_lock);
|
|
while (!list_empty(&cur_trans->dirty_bgs)) {
|
|
cache = list_first_entry(&cur_trans->dirty_bgs,
|
|
struct btrfs_block_group,
|
|
dirty_list);
|
|
|
|
if (!list_empty(&cache->io_list)) {
|
|
spin_unlock(&cur_trans->dirty_bgs_lock);
|
|
list_del_init(&cache->io_list);
|
|
btrfs_cleanup_bg_io(cache);
|
|
spin_lock(&cur_trans->dirty_bgs_lock);
|
|
}
|
|
|
|
list_del_init(&cache->dirty_list);
|
|
spin_lock(&cache->lock);
|
|
cache->disk_cache_state = BTRFS_DC_ERROR;
|
|
spin_unlock(&cache->lock);
|
|
|
|
spin_unlock(&cur_trans->dirty_bgs_lock);
|
|
btrfs_put_block_group(cache);
|
|
btrfs_dec_delayed_refs_rsv_bg_updates(fs_info);
|
|
spin_lock(&cur_trans->dirty_bgs_lock);
|
|
}
|
|
spin_unlock(&cur_trans->dirty_bgs_lock);
|
|
|
|
/*
|
|
* Refer to the definition of io_bgs member for details why it's safe
|
|
* to use it without any locking
|
|
*/
|
|
while (!list_empty(&cur_trans->io_bgs)) {
|
|
cache = list_first_entry(&cur_trans->io_bgs,
|
|
struct btrfs_block_group,
|
|
io_list);
|
|
|
|
list_del_init(&cache->io_list);
|
|
spin_lock(&cache->lock);
|
|
cache->disk_cache_state = BTRFS_DC_ERROR;
|
|
spin_unlock(&cache->lock);
|
|
btrfs_cleanup_bg_io(cache);
|
|
}
|
|
}
|
|
|
|
static void btrfs_free_all_qgroup_pertrans(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *gang[8];
|
|
int i;
|
|
int ret;
|
|
|
|
spin_lock(&fs_info->fs_roots_radix_lock);
|
|
while (1) {
|
|
ret = radix_tree_gang_lookup_tag(&fs_info->fs_roots_radix,
|
|
(void **)gang, 0,
|
|
ARRAY_SIZE(gang),
|
|
BTRFS_ROOT_TRANS_TAG);
|
|
if (ret == 0)
|
|
break;
|
|
for (i = 0; i < ret; i++) {
|
|
struct btrfs_root *root = gang[i];
|
|
|
|
btrfs_qgroup_free_meta_all_pertrans(root);
|
|
radix_tree_tag_clear(&fs_info->fs_roots_radix,
|
|
(unsigned long)btrfs_root_id(root),
|
|
BTRFS_ROOT_TRANS_TAG);
|
|
}
|
|
}
|
|
spin_unlock(&fs_info->fs_roots_radix_lock);
|
|
}
|
|
|
|
void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_device *dev, *tmp;
|
|
|
|
btrfs_cleanup_dirty_bgs(cur_trans, fs_info);
|
|
ASSERT(list_empty(&cur_trans->dirty_bgs));
|
|
ASSERT(list_empty(&cur_trans->io_bgs));
|
|
|
|
list_for_each_entry_safe(dev, tmp, &cur_trans->dev_update_list,
|
|
post_commit_list) {
|
|
list_del_init(&dev->post_commit_list);
|
|
}
|
|
|
|
btrfs_destroy_delayed_refs(cur_trans, fs_info);
|
|
|
|
cur_trans->state = TRANS_STATE_COMMIT_START;
|
|
wake_up(&fs_info->transaction_blocked_wait);
|
|
|
|
cur_trans->state = TRANS_STATE_UNBLOCKED;
|
|
wake_up(&fs_info->transaction_wait);
|
|
|
|
btrfs_destroy_marked_extents(fs_info, &cur_trans->dirty_pages,
|
|
EXTENT_DIRTY);
|
|
btrfs_destroy_pinned_extent(fs_info, &cur_trans->pinned_extents);
|
|
|
|
cur_trans->state =TRANS_STATE_COMPLETED;
|
|
wake_up(&cur_trans->commit_wait);
|
|
}
|
|
|
|
static int btrfs_cleanup_transaction(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_transaction *t;
|
|
|
|
mutex_lock(&fs_info->transaction_kthread_mutex);
|
|
|
|
spin_lock(&fs_info->trans_lock);
|
|
while (!list_empty(&fs_info->trans_list)) {
|
|
t = list_first_entry(&fs_info->trans_list,
|
|
struct btrfs_transaction, list);
|
|
if (t->state >= TRANS_STATE_COMMIT_PREP) {
|
|
refcount_inc(&t->use_count);
|
|
spin_unlock(&fs_info->trans_lock);
|
|
btrfs_wait_for_commit(fs_info, t->transid);
|
|
btrfs_put_transaction(t);
|
|
spin_lock(&fs_info->trans_lock);
|
|
continue;
|
|
}
|
|
if (t == fs_info->running_transaction) {
|
|
t->state = TRANS_STATE_COMMIT_DOING;
|
|
spin_unlock(&fs_info->trans_lock);
|
|
/*
|
|
* We wait for 0 num_writers since we don't hold a trans
|
|
* handle open currently for this transaction.
|
|
*/
|
|
wait_event(t->writer_wait,
|
|
atomic_read(&t->num_writers) == 0);
|
|
} else {
|
|
spin_unlock(&fs_info->trans_lock);
|
|
}
|
|
btrfs_cleanup_one_transaction(t, fs_info);
|
|
|
|
spin_lock(&fs_info->trans_lock);
|
|
if (t == fs_info->running_transaction)
|
|
fs_info->running_transaction = NULL;
|
|
list_del_init(&t->list);
|
|
spin_unlock(&fs_info->trans_lock);
|
|
|
|
btrfs_put_transaction(t);
|
|
trace_btrfs_transaction_commit(fs_info);
|
|
spin_lock(&fs_info->trans_lock);
|
|
}
|
|
spin_unlock(&fs_info->trans_lock);
|
|
btrfs_destroy_all_ordered_extents(fs_info);
|
|
btrfs_destroy_delayed_inodes(fs_info);
|
|
btrfs_assert_delayed_root_empty(fs_info);
|
|
btrfs_destroy_all_delalloc_inodes(fs_info);
|
|
btrfs_drop_all_logs(fs_info);
|
|
btrfs_free_all_qgroup_pertrans(fs_info);
|
|
mutex_unlock(&fs_info->transaction_kthread_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_init_root_free_objectid(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_path *path;
|
|
int ret;
|
|
struct extent_buffer *l;
|
|
struct btrfs_key search_key;
|
|
struct btrfs_key found_key;
|
|
int slot;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
search_key.objectid = BTRFS_LAST_FREE_OBJECTID;
|
|
search_key.type = -1;
|
|
search_key.offset = (u64)-1;
|
|
ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto error;
|
|
if (ret == 0) {
|
|
/*
|
|
* Key with offset -1 found, there would have to exist a root
|
|
* with such id, but this is out of valid range.
|
|
*/
|
|
ret = -EUCLEAN;
|
|
goto error;
|
|
}
|
|
if (path->slots[0] > 0) {
|
|
slot = path->slots[0] - 1;
|
|
l = path->nodes[0];
|
|
btrfs_item_key_to_cpu(l, &found_key, slot);
|
|
root->free_objectid = max_t(u64, found_key.objectid + 1,
|
|
BTRFS_FIRST_FREE_OBJECTID);
|
|
} else {
|
|
root->free_objectid = BTRFS_FIRST_FREE_OBJECTID;
|
|
}
|
|
ret = 0;
|
|
error:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid)
|
|
{
|
|
int ret;
|
|
mutex_lock(&root->objectid_mutex);
|
|
|
|
if (unlikely(root->free_objectid >= BTRFS_LAST_FREE_OBJECTID)) {
|
|
btrfs_warn(root->fs_info,
|
|
"the objectid of root %llu reaches its highest value",
|
|
btrfs_root_id(root));
|
|
ret = -ENOSPC;
|
|
goto out;
|
|
}
|
|
|
|
*objectid = root->free_objectid++;
|
|
ret = 0;
|
|
out:
|
|
mutex_unlock(&root->objectid_mutex);
|
|
return ret;
|
|
}
|