| /* |
| * 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 <linux/bio.h> |
| #include <linux/sort.h> |
| #include <linux/btrfs.h> |
| #include "async-thread.h" |
| |
| extern struct mutex uuid_mutex; |
| |
| #define BTRFS_STRIPE_LEN SZ_64K |
| |
| struct buffer_head; |
| struct btrfs_pending_bios { |
| struct bio *head; |
| struct bio *tail; |
| }; |
| |
| /* |
| * Use sequence counter to get consistent device stat data on |
| * 32-bit processors. |
| */ |
| #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
| #include <linux/seqlock.h> |
| #define __BTRFS_NEED_DEVICE_DATA_ORDERED |
| #define btrfs_device_data_ordered_init(device) \ |
| seqcount_init(&device->data_seqcount) |
| #else |
| #define btrfs_device_data_ordered_init(device) do { } while (0) |
| #endif |
| |
| struct btrfs_device { |
| struct list_head dev_list; |
| struct list_head dev_alloc_list; |
| struct btrfs_fs_devices *fs_devices; |
| struct btrfs_fs_info *fs_info; |
| |
| struct rcu_string *name; |
| |
| u64 generation; |
| |
| spinlock_t io_lock ____cacheline_aligned; |
| int running_pending; |
| /* regular prio bios */ |
| struct btrfs_pending_bios pending_bios; |
| /* sync bios */ |
| struct btrfs_pending_bios pending_sync_bios; |
| |
| struct block_device *bdev; |
| |
| /* the mode sent to blkdev_get */ |
| fmode_t mode; |
| |
| int writeable; |
| int in_fs_metadata; |
| int missing; |
| int can_discard; |
| int is_tgtdev_for_dev_replace; |
| |
| #ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED |
| seqcount_t data_seqcount; |
| #endif |
| |
| /* the internal btrfs device id */ |
| u64 devid; |
| |
| /* size of the device in memory */ |
| u64 total_bytes; |
| |
| /* size of the device on 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; |
| /* type and info about this device */ |
| u64 type; |
| |
| /* minimal io size for this device */ |
| u32 sector_size; |
| |
| /* physical drive uuid (or lvm uuid) */ |
| u8 uuid[BTRFS_UUID_SIZE]; |
| |
| /* |
| * size of the device on the current transaction |
| * |
| * This variant is update when committing the transaction, |
| * and protected by device_list_mutex |
| */ |
| u64 commit_total_bytes; |
| |
| /* bytes used on the current transaction */ |
| u64 commit_bytes_used; |
| /* |
| * used to manage the device which is resized |
| * |
| * It is protected by chunk_lock. |
| */ |
| struct list_head resized_list; |
| |
| /* for sending down flush barriers */ |
| int nobarriers; |
| struct bio *flush_bio; |
| struct completion flush_wait; |
| |
| /* 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; |
| |
| /* disk I/O failure stats. For detailed description refer to |
| * enum btrfs_dev_stat_values in ioctl.h */ |
| int dev_stats_valid; |
| |
| /* Counter to record the change of device stats */ |
| atomic_t dev_stats_ccnt; |
| atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX]; |
| }; |
| |
| /* |
| * If we read those variants at the context of their own lock, we needn't |
| * use the following helpers, reading them directly is safe. |
| */ |
| #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
| #define BTRFS_DEVICE_GETSET_FUNCS(name) \ |
| static inline u64 \ |
| btrfs_device_get_##name(const struct btrfs_device *dev) \ |
| { \ |
| u64 size; \ |
| unsigned int seq; \ |
| \ |
| do { \ |
| seq = read_seqcount_begin(&dev->data_seqcount); \ |
| size = dev->name; \ |
| } while (read_seqcount_retry(&dev->data_seqcount, seq)); \ |
| return size; \ |
| } \ |
| \ |
| static inline void \ |
| btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \ |
| { \ |
| preempt_disable(); \ |
| write_seqcount_begin(&dev->data_seqcount); \ |
| dev->name = size; \ |
| write_seqcount_end(&dev->data_seqcount); \ |
| preempt_enable(); \ |
| } |
| #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
| #define BTRFS_DEVICE_GETSET_FUNCS(name) \ |
| static inline u64 \ |
| btrfs_device_get_##name(const struct btrfs_device *dev) \ |
| { \ |
| u64 size; \ |
| \ |
| preempt_disable(); \ |
| size = dev->name; \ |
| preempt_enable(); \ |
| return size; \ |
| } \ |
| \ |
| static inline void \ |
| btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \ |
| { \ |
| preempt_disable(); \ |
| dev->name = size; \ |
| preempt_enable(); \ |
| } |
| #else |
| #define BTRFS_DEVICE_GETSET_FUNCS(name) \ |
| static inline u64 \ |
| btrfs_device_get_##name(const struct btrfs_device *dev) \ |
| { \ |
| return dev->name; \ |
| } \ |
| \ |
| static inline void \ |
| btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \ |
| { \ |
| dev->name = size; \ |
| } |
| #endif |
| |
| BTRFS_DEVICE_GETSET_FUNCS(total_bytes); |
| BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes); |
| BTRFS_DEVICE_GETSET_FUNCS(bytes_used); |
| |
| struct btrfs_fs_devices { |
| u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ |
| |
| u64 num_devices; |
| u64 open_devices; |
| u64 rw_devices; |
| u64 missing_devices; |
| u64 total_rw_bytes; |
| 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. |
| * Scrubbing super can kick off supers writing by holding |
| * this mutex lock. |
| */ |
| struct mutex device_list_mutex; |
| struct list_head devices; |
| |
| struct list_head resized_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; |
| |
| struct btrfs_fs_info *fs_info; |
| /* sysfs kobjects */ |
| struct kobject fsid_kobj; |
| struct kobject *device_dir_kobj; |
| struct completion kobj_unregister; |
| }; |
| |
| #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 int mirror_num; |
| unsigned int stripe_index; |
| u64 logical; |
| 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 refs; |
| atomic_t stripes_pending; |
| struct btrfs_fs_info *fs_info; |
| u64 map_type; /* get from map_lookup->type */ |
| bio_end_io_t *end_io; |
| struct bio *orig_bio; |
| unsigned long flags; |
| void *private; |
| atomic_t error; |
| int max_errors; |
| int num_stripes; |
| int mirror_num; |
| int num_tgtdevs; |
| int *tgtdev_map; |
| /* |
| * logical block numbers for the start of each stripe |
| * The last one or two are p/q. These are sorted, |
| * so raid_map[0] is the start of our full stripe |
| */ |
| u64 *raid_map; |
| 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 tolerated_failures; /* max tolerated fail devs */ |
| int devs_increment; /* ndevs has to be a multiple of this */ |
| int ncopies; /* how many copies to data has */ |
| }; |
| |
| extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES]; |
| extern const int btrfs_raid_mindev_error[BTRFS_NR_RAID_TYPES]; |
| extern const u64 btrfs_raid_group[BTRFS_NR_RAID_TYPES]; |
| |
| struct map_lookup { |
| u64 type; |
| int io_align; |
| int io_width; |
| u64 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))) |
| |
| 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; |
| }; |
| |
| enum btrfs_map_op { |
| BTRFS_MAP_READ, |
| BTRFS_MAP_WRITE, |
| BTRFS_MAP_DISCARD, |
| BTRFS_MAP_GET_READ_MIRRORS, |
| }; |
| |
| static inline enum btrfs_map_op btrfs_op(struct bio *bio) |
| { |
| switch (bio_op(bio)) { |
| case REQ_OP_DISCARD: |
| return BTRFS_MAP_DISCARD; |
| case REQ_OP_WRITE: |
| return BTRFS_MAP_WRITE; |
| default: |
| WARN_ON_ONCE(1); |
| case REQ_OP_READ: |
| return BTRFS_MAP_READ; |
| } |
| } |
| |
| int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, |
| u64 end, u64 *length); |
| void btrfs_get_bbio(struct btrfs_bio *bbio); |
| void btrfs_put_bbio(struct btrfs_bio *bbio); |
| int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, |
| u64 logical, u64 *length, |
| struct btrfs_bio **bbio_ret, int mirror_num); |
| int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, |
| u64 logical, u64 *length, |
| struct btrfs_bio **bbio_ret, int mirror_num, |
| int need_raid_map); |
| int btrfs_rmap_block(struct btrfs_fs_info *fs_info, |
| u64 chunk_start, u64 physical, u64 devid, |
| u64 **logical, int *naddrs, int *stripe_len); |
| int btrfs_read_sys_array(struct btrfs_fs_info *fs_info); |
| int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info); |
| int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, |
| struct btrfs_fs_info *fs_info, 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_fs_info *fs_info, 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_devices *fs_devices, int step); |
| void btrfs_assign_next_active_device(struct btrfs_fs_info *fs_info, |
| struct btrfs_device *device, struct btrfs_device *this_dev); |
| int btrfs_find_device_missing_or_by_path(struct btrfs_fs_info *fs_info, |
| char *device_path, |
| struct btrfs_device **device); |
| int btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info, u64 devid, |
| char *devpath, |
| struct btrfs_device **device); |
| struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info, |
| const u64 *devid, |
| const u8 *uuid); |
| int btrfs_rm_device(struct btrfs_fs_info *fs_info, |
| char *device_path, u64 devid); |
| 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_fs_info *fs_info, char *path); |
| int btrfs_init_dev_replace_tgtdev(struct btrfs_fs_info *fs_info, |
| char *device_path, |
| struct btrfs_device *srcdev, |
| 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_fs_info *fs_info, u64 chunk_offset); |
| int find_free_dev_extent_start(struct btrfs_transaction *transaction, |
| struct btrfs_device *device, u64 num_bytes, |
| u64 search_start, u64 *start, u64 *max_avail); |
| 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_fs_info *fs_info, |
| 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_remove_srcdev(struct btrfs_fs_info *fs_info, |
| struct btrfs_device *srcdev); |
| void btrfs_rm_dev_replace_free_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); |
| void btrfs_scratch_superblocks(struct block_device *bdev, char *device_path); |
| 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_fs_info *fs_info, |
| struct btrfs_mapping_tree *map_tree, |
| u64 logical); |
| int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans, |
| struct btrfs_fs_info *fs_info, |
| u64 chunk_offset, u64 chunk_size); |
| int btrfs_remove_chunk(struct btrfs_trans_handle *trans, |
| struct btrfs_fs_info *fs_info, u64 chunk_offset); |
| |
| static inline int btrfs_dev_stats_dirty(struct btrfs_device *dev) |
| { |
| return atomic_read(&dev->dev_stats_ccnt); |
| } |
| |
| static inline void btrfs_dev_stat_inc(struct btrfs_device *dev, |
| int index) |
| { |
| atomic_inc(dev->dev_stat_values + index); |
| smp_mb__before_atomic(); |
| atomic_inc(&dev->dev_stats_ccnt); |
| } |
| |
| 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); |
| smp_mb__before_atomic(); |
| atomic_inc(&dev->dev_stats_ccnt); |
| 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); |
| smp_mb__before_atomic(); |
| atomic_inc(&dev->dev_stats_ccnt); |
| } |
| |
| static inline void btrfs_dev_stat_reset(struct btrfs_device *dev, |
| int index) |
| { |
| btrfs_dev_stat_set(dev, index, 0); |
| } |
| |
| void btrfs_update_commit_device_size(struct btrfs_fs_info *fs_info); |
| void btrfs_update_commit_device_bytes_used(struct btrfs_fs_info *fs_info, |
| struct btrfs_transaction *transaction); |
| |
| struct list_head *btrfs_get_fs_uuids(void); |
| void btrfs_set_fs_info_ptr(struct btrfs_fs_info *fs_info); |
| void btrfs_reset_fs_info_ptr(struct btrfs_fs_info *fs_info); |
| |
| #endif |