diff options
Diffstat (limited to 'fs/btrfs/volumes.h')
| -rw-r--r-- | fs/btrfs/volumes.h | 109 |
1 files changed, 88 insertions, 21 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index 66e6fc481ecd..34b854c1a303 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -7,6 +7,7 @@ #define BTRFS_VOLUMES_H #include <linux/blk_types.h> +#include <linux/blkdev.h> #include <linux/sizes.h> #include <linux/atomic.h> #include <linux/sort.h> @@ -18,25 +19,33 @@ #include <linux/completion.h> #include <linux/rbtree.h> #include <uapi/linux/btrfs.h> +#include <uapi/linux/btrfs_tree.h> #include "messages.h" -#include "rcu-string.h" +#include "extent-io-tree.h" struct block_device; struct bdev_handle; struct btrfs_fs_info; struct btrfs_block_group; struct btrfs_trans_handle; +struct btrfs_transaction; struct btrfs_zoned_device_info; #define BTRFS_MAX_DATA_CHUNK_SIZE (10ULL * SZ_1G) +/* + * Arbitrary maximum size of one discard request to limit potentially long time + * spent in blkdev_issue_discard(). + */ +#define BTRFS_MAX_DISCARD_CHUNK_SIZE (SZ_1G) + extern struct mutex uuid_mutex; #define BTRFS_STRIPE_LEN SZ_64K #define BTRFS_STRIPE_LEN_SHIFT (16) #define BTRFS_STRIPE_LEN_MASK (BTRFS_STRIPE_LEN - 1) -static_assert(const_ilog2(BTRFS_STRIPE_LEN) == BTRFS_STRIPE_LEN_SHIFT); +static_assert(ilog2(BTRFS_STRIPE_LEN) == BTRFS_STRIPE_LEN_SHIFT); /* Used by sanity check for btrfs_raid_types. */ #define const_ffs(n) (__builtin_ctzll(n) + 1) @@ -49,8 +58,7 @@ static_assert(const_ilog2(BTRFS_STRIPE_LEN) == BTRFS_STRIPE_LEN_SHIFT); */ static_assert(const_ffs(BTRFS_BLOCK_GROUP_RAID0) < const_ffs(BTRFS_BLOCK_GROUP_PROFILE_MASK & ~BTRFS_BLOCK_GROUP_RAID0)); -static_assert(const_ilog2(BTRFS_BLOCK_GROUP_RAID0) > - ilog2(BTRFS_BLOCK_GROUP_TYPE_MASK)); +static_assert(ilog2(BTRFS_BLOCK_GROUP_RAID0) > ilog2(BTRFS_BLOCK_GROUP_TYPE_MASK)); /* ilog2() can handle both constants and variables */ #define BTRFS_BG_FLAG_TO_INDEX(profile) \ @@ -104,7 +112,8 @@ struct btrfs_device { struct btrfs_fs_devices *fs_devices; struct btrfs_fs_info *fs_info; - struct rcu_string __rcu *name; + /* Device path or NULL if missing. */ + const char __rcu *name; u64 generation; @@ -290,6 +299,9 @@ enum btrfs_chunk_allocation_policy { BTRFS_CHUNK_ALLOC_ZONED, }; +#define BTRFS_DEFAULT_RR_MIN_CONTIG_READ (SZ_256K) +/* Keep in sync with raid_attr table, current maximum is RAID1C4. */ +#define BTRFS_RAID1_MAX_MIRRORS (4) /* * Read policies for mirrored block group profiles, read picks the stripe based * on these policies. @@ -297,10 +309,16 @@ enum btrfs_chunk_allocation_policy { enum btrfs_read_policy { /* Use process PID to choose the stripe */ BTRFS_READ_POLICY_PID, +#ifdef CONFIG_BTRFS_EXPERIMENTAL + /* Balancing RAID1 reads across all striped devices (round-robin). */ + BTRFS_READ_POLICY_RR, + /* Read from a specific device. */ + BTRFS_READ_POLICY_DEVID, +#endif BTRFS_NR_READ_POLICY, }; -#ifdef CONFIG_BTRFS_DEBUG +#ifdef CONFIG_BTRFS_EXPERIMENTAL /* * Checksum mode - offload it to workqueues or do it synchronously in * btrfs_submit_chunk(). @@ -403,6 +421,16 @@ struct btrfs_fs_devices { /* Count fs-devices opened. */ int opened; + /* + * Counter of the processes that are holding this fs_devices but not + * yet opened. + * This is for mounting handling, as we can only open the fs_devices + * after a super block is created. But we cannot take uuid_mutex + * during sget_fc(), thus we have to hold the fs_devices (meaning it + * cannot be released) until a super block is returned. + */ + int holding; + /* Set when we find or add a device that doesn't have the nonrot flag set. */ bool rotating; /* Devices support TRIM/discard commands. */ @@ -411,6 +439,8 @@ struct btrfs_fs_devices { bool seeding; /* The mount needs to use a randomly generated fsid. */ bool temp_fsid; + /* Enable/disable the filesystem stats tracking. */ + bool collect_fs_stats; struct btrfs_fs_info *fs_info; /* sysfs kobjects */ @@ -424,7 +454,16 @@ struct btrfs_fs_devices { /* Policy used to read the mirrored stripes. */ enum btrfs_read_policy read_policy; -#ifdef CONFIG_BTRFS_DEBUG +#ifdef CONFIG_BTRFS_EXPERIMENTAL + /* + * Minimum contiguous reads before switching to next device, the unit + * is one block/sectorsize. + */ + u32 rr_min_contig_read; + + /* Device to be used for reading in case of RAID1. */ + u64 read_devid; + /* Checksum mode - offload it or do it synchronously. */ enum btrfs_offload_csum_mode offload_csum_mode; #endif @@ -443,8 +482,7 @@ struct btrfs_io_stripe { struct btrfs_device *dev; /* Block mapping. */ u64 physical; - u64 length; - bool is_scrub; + bool rst_search_commit_root; /* For the endio handler. */ struct btrfs_io_context *bioc; }; @@ -456,7 +494,7 @@ struct btrfs_discard_stripe { }; /* - * Context for IO subsmission for device stripe. + * Context for IO submission for device stripe. * * - Track the unfinished mirrors for mirror based profiles * Mirror based profiles are SINGLE/DUP/RAID1/RAID10. @@ -479,6 +517,7 @@ struct btrfs_io_context { struct bio *orig_bio; atomic_t error; u16 max_errors; + bool use_rst; u64 logical; u64 size; @@ -622,6 +661,11 @@ struct btrfs_dev_lookup_args { u64 devid; u8 *uuid; u8 *fsid; + /* + * If devt is specified, all other members will be ignored as it is + * enough to uniquely locate a device. + */ + dev_t devt; bool missing; }; @@ -637,7 +681,7 @@ enum btrfs_map_op { BTRFS_MAP_GET_READ_MIRRORS, }; -static inline enum btrfs_map_op btrfs_op(struct bio *bio) +static inline enum btrfs_map_op btrfs_op(const struct bio *bio) { switch (bio_op(bio)) { case REQ_OP_WRITE: @@ -684,12 +728,12 @@ struct btrfs_discard_stripe *btrfs_map_discard(struct btrfs_fs_info *fs_info, int btrfs_read_sys_array(struct btrfs_fs_info *fs_info); int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info); struct btrfs_block_group *btrfs_create_chunk(struct btrfs_trans_handle *trans, - u64 type); + struct btrfs_space_info *space_info, + u64 type); void btrfs_mapping_tree_free(struct btrfs_fs_info *fs_info); int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, blk_mode_t flags, void *holder); -struct btrfs_device *btrfs_scan_one_device(const char *path, blk_mode_t flags, - bool mount_arg_dev); +struct btrfs_device *btrfs_scan_one_device(const char *path, bool mount_arg_dev); int btrfs_forget_devices(dev_t devt); void btrfs_close_devices(struct btrfs_fs_devices *fs_devices); void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices); @@ -723,10 +767,9 @@ void btrfs_describe_block_groups(u64 flags, char *buf, u32 size_buf); 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_relocate_chunk(struct btrfs_fs_info *fs_info, u64 chunk_offset); +int btrfs_relocate_chunk(struct btrfs_fs_info *fs_info, u64 chunk_offset, + bool verbose); int btrfs_cancel_balance(struct btrfs_fs_info *fs_info); -int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info); -int btrfs_uuid_scan_kthread(void *data); bool btrfs_chunk_writeable(struct btrfs_fs_info *fs_info, u64 chunk_offset); void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index); int btrfs_get_dev_stats(struct btrfs_fs_info *fs_info, @@ -737,8 +780,6 @@ int btrfs_run_dev_stats(struct btrfs_trans_handle *trans); void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_device *srcdev); void btrfs_rm_dev_replace_free_srcdev(struct btrfs_device *srcdev); void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev); -int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info, - u64 logical, u64 len); unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info, u64 logical); u64 btrfs_calc_stripe_length(const struct btrfs_chunk_map *map); @@ -759,6 +800,8 @@ struct btrfs_chunk_map *btrfs_find_chunk_map_nolock(struct btrfs_fs_info *fs_inf struct btrfs_chunk_map *btrfs_get_chunk_map(struct btrfs_fs_info *fs_info, u64 logical, u64 length); void btrfs_remove_chunk_map(struct btrfs_fs_info *fs_info, struct btrfs_chunk_map *map); +struct btrfs_super_block *btrfs_read_disk_super(struct block_device *bdev, + int copy_num, bool drop_cache); void btrfs_release_disk_super(struct btrfs_super_block *super); static inline void btrfs_dev_stat_inc(struct btrfs_device *dev, @@ -817,7 +860,26 @@ static inline const char *btrfs_dev_name(const struct btrfs_device *device) if (!device || test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state)) return "<missing disk>"; else - return rcu_str_deref(device->name); + return rcu_dereference(device->name); +} + +static inline void btrfs_warn_unknown_chunk_allocation(enum btrfs_chunk_allocation_policy pol) +{ + WARN_ONCE(1, "unknown allocation policy %d, fallback to regular", pol); +} + +static inline void btrfs_fs_devices_inc_holding(struct btrfs_fs_devices *fs_devices) +{ + lockdep_assert_held(&uuid_mutex); + ASSERT(fs_devices->holding >= 0); + fs_devices->holding++; +} + +static inline void btrfs_fs_devices_dec_holding(struct btrfs_fs_devices *fs_devices) +{ + lockdep_assert_held(&uuid_mutex); + ASSERT(fs_devices->holding > 0); + fs_devices->holding--; } void btrfs_commit_device_sizes(struct btrfs_transaction *trans); @@ -834,6 +896,11 @@ int btrfs_verify_dev_extents(struct btrfs_fs_info *fs_info); bool btrfs_repair_one_zone(struct btrfs_fs_info *fs_info, u64 logical); bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr); -u8 *btrfs_sb_fsid_ptr(struct btrfs_super_block *sb); +const u8 *btrfs_sb_fsid_ptr(const struct btrfs_super_block *sb); + +#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS +struct btrfs_io_context *alloc_btrfs_io_context(struct btrfs_fs_info *fs_info, + u64 logical, u16 total_stripes); +#endif #endif |