b30757178d
This allows other code that needs to walk every device in the FS to do so without locking against allocations. Signed-off-by: Chris Mason <chris.mason@oracle.com>
132 lines
3.7 KiB
C
132 lines
3.7 KiB
C
/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef __BTRFS_VOLUMES_
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#define __BTRFS_VOLUMES_
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#include <linux/bio.h>
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struct buffer_head;
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struct btrfs_device {
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struct list_head dev_list;
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struct list_head dev_alloc_list;
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struct btrfs_root *dev_root;
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struct buffer_head *pending_io;
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int barriers;
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spinlock_t io_lock;
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struct block_device *bdev;
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u64 total_ios;
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char *name;
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/* the internal btrfs device id */
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u64 devid;
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/* size of the device */
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u64 total_bytes;
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/* bytes used */
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u64 bytes_used;
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/* optimal io alignment for this device */
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u32 io_align;
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/* optimal io width for this device */
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u32 io_width;
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/* minimal io size for this device */
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u32 sector_size;
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/* type and info about this device */
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u64 type;
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/* physical drive uuid (or lvm uuid) */
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u8 uuid[BTRFS_UUID_SIZE];
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};
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struct btrfs_fs_devices {
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u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
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/* the device with this id has the most recent coyp of the super */
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u64 latest_devid;
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u64 latest_trans;
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u64 lowest_devid;
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u64 num_devices;
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struct block_device *latest_bdev;
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struct block_device *lowest_bdev;
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/* all of the devices in the FS */
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struct list_head devices;
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/* devices not currently being allocated */
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struct list_head alloc_list;
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struct list_head list;
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};
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struct btrfs_bio_stripe {
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struct btrfs_device *dev;
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u64 physical;
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};
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struct btrfs_multi_bio {
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atomic_t stripes_pending;
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bio_end_io_t *end_io;
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void *private;
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int error;
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int num_stripes;
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struct btrfs_bio_stripe stripes[];
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};
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#define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
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(sizeof(struct btrfs_bio_stripe) * (n)))
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int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
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struct btrfs_device *device,
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u64 chunk_tree, u64 chunk_objectid,
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u64 chunk_offset,
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u64 num_bytes, u64 *start);
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int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
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u64 logical, u64 *length,
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struct btrfs_multi_bio **multi_ret, int mirror_num);
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int btrfs_read_sys_array(struct btrfs_root *root);
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int btrfs_read_chunk_tree(struct btrfs_root *root);
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int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
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struct btrfs_root *extent_root, u64 *start,
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u64 *num_bytes, u64 type);
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void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
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void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
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int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
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int mirror_num);
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int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
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int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
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int flags, void *holder);
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int btrfs_scan_one_device(const char *path, int flags, void *holder,
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struct btrfs_fs_devices **fs_devices_ret);
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int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
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int btrfs_add_device(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_device *device);
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int btrfs_cleanup_fs_uuids(void);
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int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
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int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
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u64 logical, struct page *page);
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#endif
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