387125fc72
When btrfs is writing the super blocks, it send barrier flushes to make sure writeback caching drives get all the metadata on disk in the right order. But, we have two bugs in the way these are sent down. When doing full commits (not via the tree log), we are sending the barrier down before the last super when it should be going down before the first. In multi-device setups, we should be waiting for the barriers to complete on all devices before writing any of the supers. Both of these bugs can cause corruptions on power failures. We fix it with some new code to send down empty barriers to all devices before writing the first super. Alexandre Oliva found the multi-device bug. Arne Jansen did the async barrier loop. Signed-off-by: Chris Mason <chris.mason@oracle.com> Reported-by: Alexandre Oliva <oliva@lsd.ic.unicamp.br>
237 lines
6.3 KiB
C
237 lines
6.3 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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#include <linux/sort.h>
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#include "async-thread.h"
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#define BTRFS_STRIPE_LEN (64 * 1024)
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struct buffer_head;
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struct btrfs_pending_bios {
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struct bio *head;
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struct bio *tail;
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};
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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_fs_devices *fs_devices;
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struct btrfs_root *dev_root;
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/* regular prio bios */
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struct btrfs_pending_bios pending_bios;
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/* WRITE_SYNC bios */
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struct btrfs_pending_bios pending_sync_bios;
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int running_pending;
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u64 generation;
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int writeable;
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int in_fs_metadata;
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int missing;
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int can_discard;
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spinlock_t io_lock;
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struct block_device *bdev;
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/* the mode sent to blkdev_get */
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fmode_t mode;
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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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/* size of the disk */
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u64 disk_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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/* per-device scrub information */
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struct scrub_dev *scrub_device;
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struct btrfs_work work;
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struct rcu_head rcu;
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struct work_struct rcu_work;
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/* readahead state */
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spinlock_t reada_lock;
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atomic_t reada_in_flight;
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u64 reada_next;
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struct reada_zone *reada_curr_zone;
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struct radix_tree_root reada_zones;
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struct radix_tree_root reada_extents;
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/* for sending down flush barriers */
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struct bio *flush_bio;
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struct completion flush_wait;
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int nobarriers;
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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 copy of the super */
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u64 latest_devid;
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u64 latest_trans;
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u64 num_devices;
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u64 open_devices;
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u64 rw_devices;
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u64 missing_devices;
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u64 total_rw_bytes;
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u64 num_can_discard;
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struct block_device *latest_bdev;
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/* all of the devices in the FS, protected by a mutex
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* so we can safely walk it to write out the supers without
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* worrying about add/remove by the multi-device code
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*/
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struct mutex device_list_mutex;
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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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struct btrfs_fs_devices *seed;
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int seeding;
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int opened;
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/* set when we find or add a device that doesn't have the
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* nonrot flag set
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*/
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int rotating;
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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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u64 length; /* only used for discard mappings */
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};
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struct btrfs_bio;
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typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
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struct btrfs_bio {
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atomic_t stripes_pending;
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bio_end_io_t *end_io;
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struct bio *orig_bio;
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void *private;
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atomic_t error;
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int max_errors;
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int num_stripes;
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int mirror_num;
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struct btrfs_bio_stripe stripes[];
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};
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struct btrfs_device_info {
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struct btrfs_device *dev;
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u64 dev_offset;
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u64 max_avail;
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u64 total_avail;
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};
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struct map_lookup {
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u64 type;
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int io_align;
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int io_width;
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int stripe_len;
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int sector_size;
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int num_stripes;
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int sub_stripes;
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struct btrfs_bio_stripe stripes[];
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};
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#define map_lookup_size(n) (sizeof(struct map_lookup) + \
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(sizeof(struct btrfs_bio_stripe) * (n)))
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int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
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u64 end, u64 *length);
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#define btrfs_bio_size(n) (sizeof(struct btrfs_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, u64 start, u64 num_bytes);
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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_bio **bbio_ret, int mirror_num);
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int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
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u64 chunk_start, u64 physical, u64 devid,
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u64 **logical, int *naddrs, int *stripe_len);
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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 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, int async_submit);
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int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
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fmode_t flags, void *holder);
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int btrfs_scan_one_device(const char *path, fmode_t 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_close_extra_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_rm_device(struct btrfs_root *root, char *device_path);
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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_grow_device(struct btrfs_trans_handle *trans,
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struct btrfs_device *device, u64 new_size);
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struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
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u8 *uuid, u8 *fsid);
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int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
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int btrfs_init_new_device(struct btrfs_root *root, char *path);
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int btrfs_balance(struct btrfs_root *dev_root);
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int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
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int find_free_dev_extent(struct btrfs_trans_handle *trans,
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struct btrfs_device *device, u64 num_bytes,
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u64 *start, u64 *max_avail);
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#endif
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