/* * Copyright (C) 2007 Oracle. All rights reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License v2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public * License along with this program; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 021110-1307, USA. */ #ifndef __BTRFS_VOLUMES_ #define __BTRFS_VOLUMES_ #include #include #include #include "async-thread.h" #define BTRFS_STRIPE_LEN (64 * 1024) struct buffer_head; struct btrfs_pending_bios { struct bio *head; struct bio *tail; }; struct btrfs_device { struct list_head dev_list; struct list_head dev_alloc_list; struct btrfs_fs_devices *fs_devices; struct btrfs_root *dev_root; /* regular prio bios */ struct btrfs_pending_bios pending_bios; /* WRITE_SYNC bios */ struct btrfs_pending_bios pending_sync_bios; int running_pending; u64 generation; int writeable; int in_fs_metadata; int missing; int can_discard; int is_tgtdev_for_dev_replace; spinlock_t io_lock; struct block_device *bdev; /* the mode sent to blkdev_get */ fmode_t mode; struct rcu_string *name; /* the internal btrfs device id */ u64 devid; /* size of the device */ u64 total_bytes; /* size of the disk */ u64 disk_total_bytes; /* bytes used */ u64 bytes_used; /* optimal io alignment for this device */ u32 io_align; /* optimal io width for this device */ u32 io_width; /* minimal io size for this device */ u32 sector_size; /* type and info about this device */ u64 type; /* physical drive uuid (or lvm uuid) */ u8 uuid[BTRFS_UUID_SIZE]; /* per-device scrub information */ struct scrub_ctx *scrub_device; struct btrfs_work work; struct rcu_head rcu; struct work_struct rcu_work; /* readahead state */ spinlock_t reada_lock; atomic_t reada_in_flight; u64 reada_next; struct reada_zone *reada_curr_zone; struct radix_tree_root reada_zones; struct radix_tree_root reada_extents; /* for sending down flush barriers */ struct bio *flush_bio; struct completion flush_wait; int nobarriers; /* disk I/O failure stats. For detailed description refer to * enum btrfs_dev_stat_values in ioctl.h */ int dev_stats_valid; int dev_stats_dirty; /* counters need to be written to disk */ atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX]; }; struct btrfs_fs_devices { u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ /* the device with this id has the most recent copy of the super */ u64 latest_devid; u64 latest_trans; u64 num_devices; u64 open_devices; u64 rw_devices; u64 missing_devices; u64 total_rw_bytes; u64 num_can_discard; u64 total_devices; struct block_device *latest_bdev; /* all of the devices in the FS, protected by a mutex * so we can safely walk it to write out the supers without * worrying about add/remove by the multi-device code */ struct mutex device_list_mutex; struct list_head devices; /* devices not currently being allocated */ struct list_head alloc_list; struct list_head list; struct btrfs_fs_devices *seed; int seeding; int opened; /* set when we find or add a device that doesn't have the * nonrot flag set */ int rotating; }; #define BTRFS_BIO_INLINE_CSUM_SIZE 64 /* * we need the mirror number and stripe index to be passed around * the call chain while we are processing end_io (especially errors). * Really, what we need is a btrfs_bio structure that has this info * and is properly sized with its stripe array, but we're not there * quite yet. We have our own btrfs bioset, and all of the bios * we allocate are actually btrfs_io_bios. We'll cram as much of * struct btrfs_bio as we can into this over time. */ typedef void (btrfs_io_bio_end_io_t) (struct btrfs_io_bio *bio, int err); struct btrfs_io_bio { unsigned long mirror_num; unsigned long stripe_index; u8 *csum; u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE]; u8 *csum_allocated; btrfs_io_bio_end_io_t *end_io; struct bio bio; }; static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio) { return container_of(bio, struct btrfs_io_bio, bio); } struct btrfs_bio_stripe { struct btrfs_device *dev; u64 physical; u64 length; /* only used for discard mappings */ }; struct btrfs_bio; typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err); struct btrfs_bio { atomic_t stripes_pending; bio_end_io_t *end_io; struct bio *orig_bio; void *private; atomic_t error; int max_errors; int num_stripes; int mirror_num; struct btrfs_bio_stripe stripes[]; }; struct btrfs_device_info { struct btrfs_device *dev; u64 dev_offset; u64 max_avail; u64 total_avail; }; struct btrfs_raid_attr { int sub_stripes; /* sub_stripes info for map */ int dev_stripes; /* stripes per dev */ int devs_max; /* max devs to use */ int devs_min; /* min devs needed */ int devs_increment; /* ndevs has to be a multiple of this */ int ncopies; /* how many copies to data has */ }; struct map_lookup { u64 type; int io_align; int io_width; int stripe_len; int sector_size; int num_stripes; int sub_stripes; struct btrfs_bio_stripe stripes[]; }; #define map_lookup_size(n) (sizeof(struct map_lookup) + \ (sizeof(struct btrfs_bio_stripe) * (n))) /* * Restriper's general type filter */ #define BTRFS_BALANCE_DATA (1ULL << 0) #define BTRFS_BALANCE_SYSTEM (1ULL << 1) #define BTRFS_BALANCE_METADATA (1ULL << 2) #define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA | \ BTRFS_BALANCE_SYSTEM | \ BTRFS_BALANCE_METADATA) #define BTRFS_BALANCE_FORCE (1ULL << 3) #define BTRFS_BALANCE_RESUME (1ULL << 4) /* * Balance filters */ #define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0) #define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1) #define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2) #define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3) #define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4) /* * Profile changing flags. When SOFT is set we won't relocate chunk if * it already has the target profile (even though it may be * half-filled). */ #define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8) #define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9) struct btrfs_balance_args; struct btrfs_balance_progress; struct btrfs_balance_control { struct btrfs_fs_info *fs_info; struct btrfs_balance_args data; struct btrfs_balance_args meta; struct btrfs_balance_args sys; u64 flags; struct btrfs_balance_progress stat; }; int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, u64 end, u64 *length); #define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \ (sizeof(struct btrfs_bio_stripe) * (n))) int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw, u64 logical, u64 *length, struct btrfs_bio **bbio_ret, int mirror_num); int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, u64 chunk_start, u64 physical, u64 devid, u64 **logical, int *naddrs, int *stripe_len); int btrfs_read_sys_array(struct btrfs_root *root); int btrfs_read_chunk_tree(struct btrfs_root *root); int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, struct btrfs_root *extent_root, u64 type); void btrfs_mapping_init(struct btrfs_mapping_tree *tree); void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, int mirror_num, int async_submit); int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, fmode_t flags, void *holder); int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, struct btrfs_fs_devices **fs_devices_ret); int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info, struct btrfs_fs_devices *fs_devices, int step); int btrfs_find_device_missing_or_by_path(struct btrfs_root *root, char *device_path, struct btrfs_device **device); int btrfs_rm_device(struct btrfs_root *root, char *device_path); void btrfs_cleanup_fs_uuids(void); int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len); int btrfs_grow_device(struct btrfs_trans_handle *trans, struct btrfs_device *device, u64 new_size); struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid, u8 *uuid, u8 *fsid); int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); int btrfs_init_new_device(struct btrfs_root *root, char *path); int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path, struct btrfs_device **device_out); int btrfs_balance(struct btrfs_balance_control *bctl, struct btrfs_ioctl_balance_args *bargs); int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info); int btrfs_recover_balance(struct btrfs_fs_info *fs_info); int btrfs_pause_balance(struct btrfs_fs_info *fs_info); int btrfs_cancel_balance(struct btrfs_fs_info *fs_info); int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info); int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info); int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset); int find_free_dev_extent(struct btrfs_trans_handle *trans, struct btrfs_device *device, u64 num_bytes, u64 *start, u64 *max_avail); void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index); int btrfs_get_dev_stats(struct btrfs_root *root, struct btrfs_ioctl_get_dev_stats *stats); void btrfs_init_devices_late(struct btrfs_fs_info *fs_info); int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info); int btrfs_run_dev_stats(struct btrfs_trans_handle *trans, struct btrfs_fs_info *fs_info); void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info, struct btrfs_device *srcdev); void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info, struct btrfs_device *tgtdev); void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info, struct btrfs_device *tgtdev); int btrfs_scratch_superblock(struct btrfs_device *device); int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len, int mirror_num); unsigned long btrfs_full_stripe_len(struct btrfs_root *root, struct btrfs_mapping_tree *map_tree, u64 logical); int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans, struct btrfs_root *extent_root, u64 chunk_offset, u64 chunk_size); static inline void btrfs_dev_stat_inc(struct btrfs_device *dev, int index) { atomic_inc(dev->dev_stat_values + index); dev->dev_stats_dirty = 1; } static inline int btrfs_dev_stat_read(struct btrfs_device *dev, int index) { return atomic_read(dev->dev_stat_values + index); } static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev, int index) { int ret; ret = atomic_xchg(dev->dev_stat_values + index, 0); dev->dev_stats_dirty = 1; return ret; } static inline void btrfs_dev_stat_set(struct btrfs_device *dev, int index, unsigned long val) { atomic_set(dev->dev_stat_values + index, val); dev->dev_stats_dirty = 1; } static inline void btrfs_dev_stat_reset(struct btrfs_device *dev, int index) { btrfs_dev_stat_set(dev, index, 0); } #endif