e5ac171992
There are no remaining callers of gfs2_jdata_writepage() other than vmscan, which is known to do more harm than good. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
741 lines
19 KiB
C
741 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
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*/
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/pagemap.h>
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#include <linux/pagevec.h>
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#include <linux/mpage.h>
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#include <linux/fs.h>
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#include <linux/writeback.h>
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#include <linux/swap.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/backing-dev.h>
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#include <linux/uio.h>
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#include <trace/events/writeback.h>
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#include <linux/sched/signal.h>
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#include "gfs2.h"
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#include "incore.h"
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#include "bmap.h"
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#include "glock.h"
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#include "inode.h"
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#include "log.h"
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#include "meta_io.h"
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#include "quota.h"
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#include "trans.h"
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#include "rgrp.h"
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#include "super.h"
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#include "util.h"
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#include "glops.h"
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#include "aops.h"
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void gfs2_trans_add_databufs(struct gfs2_inode *ip, struct folio *folio,
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size_t from, size_t len)
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{
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struct buffer_head *head = folio_buffers(folio);
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unsigned int bsize = head->b_size;
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struct buffer_head *bh;
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size_t to = from + len;
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size_t start, end;
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for (bh = head, start = 0; bh != head || !start;
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bh = bh->b_this_page, start = end) {
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end = start + bsize;
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if (end <= from)
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continue;
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if (start >= to)
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break;
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set_buffer_uptodate(bh);
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gfs2_trans_add_data(ip->i_gl, bh);
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}
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}
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/**
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* gfs2_get_block_noalloc - Fills in a buffer head with details about a block
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* @inode: The inode
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* @lblock: The block number to look up
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* @bh_result: The buffer head to return the result in
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* @create: Non-zero if we may add block to the file
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*
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* Returns: errno
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*/
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static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock,
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struct buffer_head *bh_result, int create)
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{
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int error;
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error = gfs2_block_map(inode, lblock, bh_result, 0);
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if (error)
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return error;
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if (!buffer_mapped(bh_result))
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return -ENODATA;
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return 0;
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}
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/**
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* gfs2_write_jdata_folio - gfs2 jdata-specific version of block_write_full_folio
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* @folio: The folio to write
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* @wbc: The writeback control
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*
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* This is the same as calling block_write_full_folio, but it also
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* writes pages outside of i_size
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*/
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static int gfs2_write_jdata_folio(struct folio *folio,
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struct writeback_control *wbc)
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{
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struct inode * const inode = folio->mapping->host;
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loff_t i_size = i_size_read(inode);
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/*
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* The folio straddles i_size. It must be zeroed out on each and every
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* writepage invocation because it may be mmapped. "A file is mapped
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* in multiples of the page size. For a file that is not a multiple of
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* the page size, the remaining memory is zeroed when mapped, and
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* writes to that region are not written out to the file."
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*/
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if (folio_pos(folio) < i_size &&
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i_size < folio_pos(folio) + folio_size(folio))
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folio_zero_segment(folio, offset_in_folio(folio, i_size),
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folio_size(folio));
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return __block_write_full_folio(inode, folio, gfs2_get_block_noalloc,
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wbc);
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}
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/**
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* __gfs2_jdata_write_folio - The core of jdata writepage
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* @folio: The folio to write
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* @wbc: The writeback control
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*
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* Implements the core of write back. If a transaction is required then
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* the checked flag will have been set and the transaction will have
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* already been started before this is called.
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*/
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static int __gfs2_jdata_write_folio(struct folio *folio,
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struct writeback_control *wbc)
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{
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struct inode *inode = folio->mapping->host;
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struct gfs2_inode *ip = GFS2_I(inode);
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if (folio_test_checked(folio)) {
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folio_clear_checked(folio);
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if (!folio_buffers(folio)) {
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create_empty_buffers(folio,
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inode->i_sb->s_blocksize,
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BIT(BH_Dirty)|BIT(BH_Uptodate));
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}
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gfs2_trans_add_databufs(ip, folio, 0, folio_size(folio));
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}
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return gfs2_write_jdata_folio(folio, wbc);
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}
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/**
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* gfs2_writepages - Write a bunch of dirty pages back to disk
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* @mapping: The mapping to write
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* @wbc: Write-back control
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*
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* Used for both ordered and writeback modes.
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*/
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static int gfs2_writepages(struct address_space *mapping,
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struct writeback_control *wbc)
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{
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struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
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struct iomap_writepage_ctx wpc = { };
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int ret;
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/*
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* Even if we didn't write enough pages here, we might still be holding
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* dirty pages in the ail. We forcibly flush the ail because we don't
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* want balance_dirty_pages() to loop indefinitely trying to write out
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* pages held in the ail that it can't find.
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*/
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ret = iomap_writepages(mapping, wbc, &wpc, &gfs2_writeback_ops);
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if (ret == 0 && wbc->nr_to_write > 0)
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set_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags);
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return ret;
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}
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/**
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* gfs2_write_jdata_batch - Write back a folio batch's worth of folios
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* @mapping: The mapping
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* @wbc: The writeback control
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* @fbatch: The batch of folios
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* @done_index: Page index
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*
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* Returns: non-zero if loop should terminate, zero otherwise
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*/
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static int gfs2_write_jdata_batch(struct address_space *mapping,
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struct writeback_control *wbc,
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struct folio_batch *fbatch,
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pgoff_t *done_index)
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{
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struct inode *inode = mapping->host;
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struct gfs2_sbd *sdp = GFS2_SB(inode);
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unsigned nrblocks;
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int i;
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int ret;
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size_t size = 0;
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int nr_folios = folio_batch_count(fbatch);
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for (i = 0; i < nr_folios; i++)
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size += folio_size(fbatch->folios[i]);
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nrblocks = size >> inode->i_blkbits;
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ret = gfs2_trans_begin(sdp, nrblocks, nrblocks);
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if (ret < 0)
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return ret;
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for (i = 0; i < nr_folios; i++) {
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struct folio *folio = fbatch->folios[i];
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*done_index = folio->index;
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folio_lock(folio);
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if (unlikely(folio->mapping != mapping)) {
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continue_unlock:
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folio_unlock(folio);
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continue;
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}
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if (!folio_test_dirty(folio)) {
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/* someone wrote it for us */
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goto continue_unlock;
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}
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if (folio_test_writeback(folio)) {
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if (wbc->sync_mode != WB_SYNC_NONE)
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folio_wait_writeback(folio);
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else
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goto continue_unlock;
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}
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BUG_ON(folio_test_writeback(folio));
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if (!folio_clear_dirty_for_io(folio))
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goto continue_unlock;
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trace_wbc_writepage(wbc, inode_to_bdi(inode));
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ret = __gfs2_jdata_write_folio(folio, wbc);
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if (unlikely(ret)) {
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if (ret == AOP_WRITEPAGE_ACTIVATE) {
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folio_unlock(folio);
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ret = 0;
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} else {
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/*
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* done_index is set past this page,
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* so media errors will not choke
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* background writeout for the entire
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* file. This has consequences for
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* range_cyclic semantics (ie. it may
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* not be suitable for data integrity
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* writeout).
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*/
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*done_index = folio_next_index(folio);
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ret = 1;
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break;
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}
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}
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/*
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* We stop writing back only if we are not doing
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* integrity sync. In case of integrity sync we have to
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* keep going until we have written all the pages
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* we tagged for writeback prior to entering this loop.
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*/
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if (--wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) {
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ret = 1;
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break;
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}
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}
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gfs2_trans_end(sdp);
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return ret;
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}
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/**
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* gfs2_write_cache_jdata - Like write_cache_pages but different
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* @mapping: The mapping to write
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* @wbc: The writeback control
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*
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* The reason that we use our own function here is that we need to
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* start transactions before we grab page locks. This allows us
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* to get the ordering right.
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*/
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static int gfs2_write_cache_jdata(struct address_space *mapping,
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struct writeback_control *wbc)
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{
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int ret = 0;
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int done = 0;
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struct folio_batch fbatch;
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int nr_folios;
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pgoff_t writeback_index;
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pgoff_t index;
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pgoff_t end;
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pgoff_t done_index;
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int cycled;
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int range_whole = 0;
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xa_mark_t tag;
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folio_batch_init(&fbatch);
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if (wbc->range_cyclic) {
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writeback_index = mapping->writeback_index; /* prev offset */
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index = writeback_index;
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if (index == 0)
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cycled = 1;
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else
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cycled = 0;
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end = -1;
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} else {
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index = wbc->range_start >> PAGE_SHIFT;
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end = wbc->range_end >> PAGE_SHIFT;
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if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
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range_whole = 1;
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cycled = 1; /* ignore range_cyclic tests */
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}
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if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
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tag = PAGECACHE_TAG_TOWRITE;
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else
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tag = PAGECACHE_TAG_DIRTY;
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retry:
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if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
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tag_pages_for_writeback(mapping, index, end);
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done_index = index;
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while (!done && (index <= end)) {
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nr_folios = filemap_get_folios_tag(mapping, &index, end,
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tag, &fbatch);
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if (nr_folios == 0)
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break;
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ret = gfs2_write_jdata_batch(mapping, wbc, &fbatch,
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&done_index);
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if (ret)
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done = 1;
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if (ret > 0)
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ret = 0;
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folio_batch_release(&fbatch);
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cond_resched();
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}
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if (!cycled && !done) {
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/*
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* range_cyclic:
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* We hit the last page and there is more work to be done: wrap
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* back to the start of the file
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*/
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cycled = 1;
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index = 0;
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end = writeback_index - 1;
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goto retry;
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}
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if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
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mapping->writeback_index = done_index;
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return ret;
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}
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/**
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* gfs2_jdata_writepages - Write a bunch of dirty pages back to disk
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* @mapping: The mapping to write
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* @wbc: The writeback control
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*
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*/
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static int gfs2_jdata_writepages(struct address_space *mapping,
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struct writeback_control *wbc)
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{
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struct gfs2_inode *ip = GFS2_I(mapping->host);
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struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
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int ret;
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ret = gfs2_write_cache_jdata(mapping, wbc);
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if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) {
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gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
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GFS2_LFC_JDATA_WPAGES);
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ret = gfs2_write_cache_jdata(mapping, wbc);
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}
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return ret;
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}
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/**
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* stuffed_read_folio - Fill in a Linux folio with stuffed file data
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* @ip: the inode
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* @folio: the folio
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*
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* Returns: errno
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*/
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static int stuffed_read_folio(struct gfs2_inode *ip, struct folio *folio)
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{
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struct buffer_head *dibh = NULL;
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size_t dsize = i_size_read(&ip->i_inode);
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void *from = NULL;
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int error = 0;
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/*
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* Due to the order of unstuffing files and ->fault(), we can be
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* asked for a zero folio in the case of a stuffed file being extended,
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* so we need to supply one here. It doesn't happen often.
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*/
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if (unlikely(folio->index)) {
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dsize = 0;
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} else {
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error = gfs2_meta_inode_buffer(ip, &dibh);
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if (error)
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goto out;
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from = dibh->b_data + sizeof(struct gfs2_dinode);
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}
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folio_fill_tail(folio, 0, from, dsize);
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brelse(dibh);
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out:
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folio_end_read(folio, error == 0);
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return error;
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}
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/**
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* gfs2_read_folio - read a folio from a file
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* @file: The file to read
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* @folio: The folio in the file
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*/
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static int gfs2_read_folio(struct file *file, struct folio *folio)
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{
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struct inode *inode = folio->mapping->host;
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_sbd *sdp = GFS2_SB(inode);
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int error;
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if (!gfs2_is_jdata(ip) ||
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(i_blocksize(inode) == PAGE_SIZE && !folio_buffers(folio))) {
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error = iomap_read_folio(folio, &gfs2_iomap_ops);
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} else if (gfs2_is_stuffed(ip)) {
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error = stuffed_read_folio(ip, folio);
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} else {
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error = mpage_read_folio(folio, gfs2_block_map);
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}
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if (gfs2_withdrawing_or_withdrawn(sdp))
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return -EIO;
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return error;
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}
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/**
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* gfs2_internal_read - read an internal file
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* @ip: The gfs2 inode
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* @buf: The buffer to fill
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* @pos: The file position
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* @size: The amount to read
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*
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*/
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ssize_t gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos,
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size_t size)
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{
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struct address_space *mapping = ip->i_inode.i_mapping;
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unsigned long index = *pos >> PAGE_SHIFT;
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size_t copied = 0;
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do {
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size_t offset, chunk;
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struct folio *folio;
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folio = read_cache_folio(mapping, index, gfs2_read_folio, NULL);
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if (IS_ERR(folio)) {
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if (PTR_ERR(folio) == -EINTR)
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continue;
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return PTR_ERR(folio);
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}
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offset = *pos + copied - folio_pos(folio);
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chunk = min(size - copied, folio_size(folio) - offset);
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memcpy_from_folio(buf + copied, folio, offset, chunk);
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index = folio_next_index(folio);
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folio_put(folio);
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copied += chunk;
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} while(copied < size);
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(*pos) += size;
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return size;
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}
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/**
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* gfs2_readahead - Read a bunch of pages at once
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* @rac: Read-ahead control structure
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*
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* Some notes:
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* 1. This is only for readahead, so we can simply ignore any things
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* which are slightly inconvenient (such as locking conflicts between
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* the page lock and the glock) and return having done no I/O. Its
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* obviously not something we'd want to do on too regular a basis.
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* Any I/O we ignore at this time will be done via readpage later.
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* 2. We don't handle stuffed files here we let readpage do the honours.
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* 3. mpage_readahead() does most of the heavy lifting in the common case.
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* 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places.
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*/
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static void gfs2_readahead(struct readahead_control *rac)
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{
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struct inode *inode = rac->mapping->host;
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struct gfs2_inode *ip = GFS2_I(inode);
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if (gfs2_is_stuffed(ip))
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;
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else if (gfs2_is_jdata(ip))
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mpage_readahead(rac, gfs2_block_map);
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else
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iomap_readahead(rac, &gfs2_iomap_ops);
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}
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|
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/**
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* adjust_fs_space - Adjusts the free space available due to gfs2_grow
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* @inode: the rindex inode
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|
*/
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void adjust_fs_space(struct inode *inode)
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{
|
|
struct gfs2_sbd *sdp = GFS2_SB(inode);
|
|
struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
|
|
struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
|
|
struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
|
|
struct buffer_head *m_bh;
|
|
u64 fs_total, new_free;
|
|
|
|
if (gfs2_trans_begin(sdp, 2 * RES_STATFS, 0) != 0)
|
|
return;
|
|
|
|
/* Total up the file system space, according to the latest rindex. */
|
|
fs_total = gfs2_ri_total(sdp);
|
|
if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0)
|
|
goto out;
|
|
|
|
spin_lock(&sdp->sd_statfs_spin);
|
|
gfs2_statfs_change_in(m_sc, m_bh->b_data +
|
|
sizeof(struct gfs2_dinode));
|
|
if (fs_total > (m_sc->sc_total + l_sc->sc_total))
|
|
new_free = fs_total - (m_sc->sc_total + l_sc->sc_total);
|
|
else
|
|
new_free = 0;
|
|
spin_unlock(&sdp->sd_statfs_spin);
|
|
fs_warn(sdp, "File system extended by %llu blocks.\n",
|
|
(unsigned long long)new_free);
|
|
gfs2_statfs_change(sdp, new_free, new_free, 0);
|
|
|
|
update_statfs(sdp, m_bh);
|
|
brelse(m_bh);
|
|
out:
|
|
sdp->sd_rindex_uptodate = 0;
|
|
gfs2_trans_end(sdp);
|
|
}
|
|
|
|
static bool jdata_dirty_folio(struct address_space *mapping,
|
|
struct folio *folio)
|
|
{
|
|
if (current->journal_info)
|
|
folio_set_checked(folio);
|
|
return block_dirty_folio(mapping, folio);
|
|
}
|
|
|
|
/**
|
|
* gfs2_bmap - Block map function
|
|
* @mapping: Address space info
|
|
* @lblock: The block to map
|
|
*
|
|
* Returns: The disk address for the block or 0 on hole or error
|
|
*/
|
|
|
|
static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(mapping->host);
|
|
struct gfs2_holder i_gh;
|
|
sector_t dblock = 0;
|
|
int error;
|
|
|
|
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
|
|
if (error)
|
|
return 0;
|
|
|
|
if (!gfs2_is_stuffed(ip))
|
|
dblock = iomap_bmap(mapping, lblock, &gfs2_iomap_ops);
|
|
|
|
gfs2_glock_dq_uninit(&i_gh);
|
|
|
|
return dblock;
|
|
}
|
|
|
|
static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh)
|
|
{
|
|
struct gfs2_bufdata *bd;
|
|
|
|
lock_buffer(bh);
|
|
gfs2_log_lock(sdp);
|
|
clear_buffer_dirty(bh);
|
|
bd = bh->b_private;
|
|
if (bd) {
|
|
if (!list_empty(&bd->bd_list) && !buffer_pinned(bh))
|
|
list_del_init(&bd->bd_list);
|
|
else {
|
|
spin_lock(&sdp->sd_ail_lock);
|
|
gfs2_remove_from_journal(bh, REMOVE_JDATA);
|
|
spin_unlock(&sdp->sd_ail_lock);
|
|
}
|
|
}
|
|
bh->b_bdev = NULL;
|
|
clear_buffer_mapped(bh);
|
|
clear_buffer_req(bh);
|
|
clear_buffer_new(bh);
|
|
gfs2_log_unlock(sdp);
|
|
unlock_buffer(bh);
|
|
}
|
|
|
|
static void gfs2_invalidate_folio(struct folio *folio, size_t offset,
|
|
size_t length)
|
|
{
|
|
struct gfs2_sbd *sdp = GFS2_SB(folio->mapping->host);
|
|
size_t stop = offset + length;
|
|
int partial_page = (offset || length < folio_size(folio));
|
|
struct buffer_head *bh, *head;
|
|
unsigned long pos = 0;
|
|
|
|
BUG_ON(!folio_test_locked(folio));
|
|
if (!partial_page)
|
|
folio_clear_checked(folio);
|
|
head = folio_buffers(folio);
|
|
if (!head)
|
|
goto out;
|
|
|
|
bh = head;
|
|
do {
|
|
if (pos + bh->b_size > stop)
|
|
return;
|
|
|
|
if (offset <= pos)
|
|
gfs2_discard(sdp, bh);
|
|
pos += bh->b_size;
|
|
bh = bh->b_this_page;
|
|
} while (bh != head);
|
|
out:
|
|
if (!partial_page)
|
|
filemap_release_folio(folio, 0);
|
|
}
|
|
|
|
/**
|
|
* gfs2_release_folio - free the metadata associated with a folio
|
|
* @folio: the folio that's being released
|
|
* @gfp_mask: passed from Linux VFS, ignored by us
|
|
*
|
|
* Calls try_to_free_buffers() to free the buffers and put the folio if the
|
|
* buffers can be released.
|
|
*
|
|
* Returns: true if the folio was put or else false
|
|
*/
|
|
|
|
bool gfs2_release_folio(struct folio *folio, gfp_t gfp_mask)
|
|
{
|
|
struct address_space *mapping = folio->mapping;
|
|
struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
|
|
struct buffer_head *bh, *head;
|
|
struct gfs2_bufdata *bd;
|
|
|
|
head = folio_buffers(folio);
|
|
if (!head)
|
|
return false;
|
|
|
|
/*
|
|
* mm accommodates an old ext3 case where clean folios might
|
|
* not have had the dirty bit cleared. Thus, it can send actual
|
|
* dirty folios to ->release_folio() via shrink_active_list().
|
|
*
|
|
* As a workaround, we skip folios that contain dirty buffers
|
|
* below. Once ->release_folio isn't called on dirty folios
|
|
* anymore, we can warn on dirty buffers like we used to here
|
|
* again.
|
|
*/
|
|
|
|
gfs2_log_lock(sdp);
|
|
bh = head;
|
|
do {
|
|
if (atomic_read(&bh->b_count))
|
|
goto cannot_release;
|
|
bd = bh->b_private;
|
|
if (bd && bd->bd_tr)
|
|
goto cannot_release;
|
|
if (buffer_dirty(bh) || WARN_ON(buffer_pinned(bh)))
|
|
goto cannot_release;
|
|
bh = bh->b_this_page;
|
|
} while (bh != head);
|
|
|
|
bh = head;
|
|
do {
|
|
bd = bh->b_private;
|
|
if (bd) {
|
|
gfs2_assert_warn(sdp, bd->bd_bh == bh);
|
|
bd->bd_bh = NULL;
|
|
bh->b_private = NULL;
|
|
/*
|
|
* The bd may still be queued as a revoke, in which
|
|
* case we must not dequeue nor free it.
|
|
*/
|
|
if (!bd->bd_blkno && !list_empty(&bd->bd_list))
|
|
list_del_init(&bd->bd_list);
|
|
if (list_empty(&bd->bd_list))
|
|
kmem_cache_free(gfs2_bufdata_cachep, bd);
|
|
}
|
|
|
|
bh = bh->b_this_page;
|
|
} while (bh != head);
|
|
gfs2_log_unlock(sdp);
|
|
|
|
return try_to_free_buffers(folio);
|
|
|
|
cannot_release:
|
|
gfs2_log_unlock(sdp);
|
|
return false;
|
|
}
|
|
|
|
static const struct address_space_operations gfs2_aops = {
|
|
.writepages = gfs2_writepages,
|
|
.read_folio = gfs2_read_folio,
|
|
.readahead = gfs2_readahead,
|
|
.dirty_folio = iomap_dirty_folio,
|
|
.release_folio = iomap_release_folio,
|
|
.invalidate_folio = iomap_invalidate_folio,
|
|
.bmap = gfs2_bmap,
|
|
.migrate_folio = filemap_migrate_folio,
|
|
.is_partially_uptodate = iomap_is_partially_uptodate,
|
|
.error_remove_folio = generic_error_remove_folio,
|
|
};
|
|
|
|
static const struct address_space_operations gfs2_jdata_aops = {
|
|
.writepages = gfs2_jdata_writepages,
|
|
.read_folio = gfs2_read_folio,
|
|
.readahead = gfs2_readahead,
|
|
.dirty_folio = jdata_dirty_folio,
|
|
.bmap = gfs2_bmap,
|
|
.migrate_folio = buffer_migrate_folio,
|
|
.invalidate_folio = gfs2_invalidate_folio,
|
|
.release_folio = gfs2_release_folio,
|
|
.is_partially_uptodate = block_is_partially_uptodate,
|
|
.error_remove_folio = generic_error_remove_folio,
|
|
};
|
|
|
|
void gfs2_set_aops(struct inode *inode)
|
|
{
|
|
if (gfs2_is_jdata(GFS2_I(inode)))
|
|
inode->i_mapping->a_ops = &gfs2_jdata_aops;
|
|
else
|
|
inode->i_mapping->a_ops = &gfs2_aops;
|
|
}
|