diff options
Diffstat (limited to 'fs/btrfs/volumes.h')
| -rw-r--r-- | fs/btrfs/volumes.h | 669 |
1 files changed, 497 insertions, 172 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index f067b5934c46..34b854c1a303 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -6,30 +6,78 @@ #ifndef BTRFS_VOLUMES_H #define BTRFS_VOLUMES_H -#include <linux/bio.h> +#include <linux/blk_types.h> +#include <linux/blkdev.h> +#include <linux/sizes.h> +#include <linux/atomic.h> #include <linux/sort.h> -#include <linux/btrfs.h> -#include "async-thread.h" +#include <linux/list.h> +#include <linux/mutex.h> +#include <linux/log2.h> +#include <linux/kobject.h> +#include <linux/refcount.h> +#include <linux/completion.h> +#include <linux/rbtree.h> +#include <uapi/linux/btrfs.h> +#include <uapi/linux/btrfs_tree.h> +#include "messages.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 - -struct btrfs_io_geometry { - /* remaining bytes before crossing a stripe */ - u64 len; - /* offset of logical address in chunk */ - u64 offset; - /* length of single IO stripe */ - u64 stripe_len; - /* number of stripe where address falls */ - u64 stripe_nr; - /* offset of address in stripe */ - u64 stripe_offset; - /* offset of raid56 stripe into the chunk */ - u64 raid56_stripe_offset; +#define BTRFS_STRIPE_LEN SZ_64K +#define BTRFS_STRIPE_LEN_SHIFT (16) +#define BTRFS_STRIPE_LEN_MASK (BTRFS_STRIPE_LEN - 1) + +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) + +/* + * The conversion from BTRFS_BLOCK_GROUP_* bits to btrfs_raid_type requires + * RAID0 always to be the lowest profile bit. + * Although it's part of on-disk format and should never change, do extra + * compile-time sanity checks. + */ +static_assert(const_ffs(BTRFS_BLOCK_GROUP_RAID0) < + const_ffs(BTRFS_BLOCK_GROUP_PROFILE_MASK & ~BTRFS_BLOCK_GROUP_RAID0)); +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) \ + ilog2((profile) >> (ilog2(BTRFS_BLOCK_GROUP_RAID0) - 1)) + +enum btrfs_raid_types { + /* SINGLE is the special one as it doesn't have on-disk bit. */ + BTRFS_RAID_SINGLE = 0, + + BTRFS_RAID_RAID0 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID0), + BTRFS_RAID_RAID1 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1), + BTRFS_RAID_DUP = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_DUP), + BTRFS_RAID_RAID10 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID10), + BTRFS_RAID_RAID5 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID5), + BTRFS_RAID_RAID6 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID6), + BTRFS_RAID_RAID1C3 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1C3), + BTRFS_RAID_RAID1C4 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1C4), + + BTRFS_NR_RAID_TYPES }; /* @@ -50,6 +98,12 @@ struct btrfs_io_geometry { #define BTRFS_DEV_STATE_MISSING (2) #define BTRFS_DEV_STATE_REPLACE_TGT (3) #define BTRFS_DEV_STATE_FLUSH_SENT (4) +#define BTRFS_DEV_STATE_NO_READA (5) + +/* Special value encoding failure to write primary super block. */ +#define BTRFS_SUPER_PRIMARY_WRITE_ERROR (INT_MAX / 2) + +struct btrfs_fs_devices; struct btrfs_device { struct list_head dev_list; /* device_list_mutex */ @@ -58,15 +112,21 @@ struct btrfs_device { struct btrfs_fs_devices *fs_devices; struct btrfs_fs_info *fs_info; - struct rcu_string *name; + /* Device path or NULL if missing. */ + const char __rcu *name; u64 generation; + struct file *bdev_file; struct block_device *bdev; - /* the mode sent to blkdev_get */ - fmode_t mode; + struct btrfs_zoned_device_info *zone_info; + /* + * Device's major-minor number. Must be set even if the device is not + * opened (bdev == NULL), unless the device is missing. + */ + dev_t devt; unsigned long dev_state; blk_status_t last_flush_error; @@ -94,6 +154,12 @@ struct btrfs_device { /* type and info about this device */ u64 type; + /* + * Counter of super block write errors, values larger than + * BTRFS_SUPER_PRIMARY_WRITE_ERROR encode primary super block write failure. + */ + atomic_t sb_write_errors; + /* minimal io size for this device */ u32 sector_size; @@ -111,20 +177,13 @@ struct btrfs_device { /* bytes used on the current transaction */ u64 commit_bytes_used; - /* for sending down flush barriers */ - struct bio *flush_bio; + /* Bio used for flushing device barriers */ + struct bio flush_bio; struct completion flush_wait; /* per-device scrub information */ struct scrub_ctx *scrub_ctx; - /* readahead state */ - 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; @@ -138,6 +197,34 @@ struct btrfs_device { struct completion kobj_unregister; /* For sysfs/FSID/devinfo/devid/ */ struct kobject devid_kobj; + + /* Bandwidth limit for scrub, in bytes */ + u64 scrub_speed_max; +}; + +/* + * Block group or device which contains an active swapfile. Used for preventing + * unsafe operations while a swapfile is active. + * + * These are sorted on (ptr, inode) (note that a block group or device can + * contain more than one swapfile). We compare the pointer values because we + * don't actually care what the object is, we just need a quick check whether + * the object exists in the rbtree. + */ +struct btrfs_swapfile_pin { + struct rb_node node; + void *ptr; + struct inode *inode; + /* + * If true, ptr points to a struct btrfs_block_group. Otherwise, ptr + * points to a struct btrfs_device. + */ + bool is_block_group; + /* + * Only used when 'is_block_group' is true and it is the number of + * extents used by a swapfile for this block group ('ptr' field). + */ + int bg_extent_count; }; /* @@ -209,52 +296,151 @@ BTRFS_DEVICE_GETSET_FUNCS(bytes_used); enum btrfs_chunk_allocation_policy { BTRFS_CHUNK_ALLOC_REGULAR, + 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. + */ +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_EXPERIMENTAL +/* + * Checksum mode - offload it to workqueues or do it synchronously in + * btrfs_submit_chunk(). + */ +enum btrfs_offload_csum_mode { + /* + * Choose offloading checksum or do it synchronously automatically. + * Do it synchronously if the checksum is fast, or offload to workqueues + * otherwise. + */ + BTRFS_OFFLOAD_CSUM_AUTO, + /* Always offload checksum to workqueues. */ + BTRFS_OFFLOAD_CSUM_FORCE_ON, + /* Never offload checksum to workqueues. */ + BTRFS_OFFLOAD_CSUM_FORCE_OFF, +}; +#endif + struct btrfs_fs_devices { u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ + + /* + * UUID written into the btree blocks: + * + * - If metadata_uuid != fsid then super block must have + * BTRFS_FEATURE_INCOMPAT_METADATA_UUID flag set. + * + * - Following shall be true at all times: + * - metadata_uuid == btrfs_header::fsid + * - metadata_uuid == btrfs_dev_item::fsid + * + * - Relations between fsid and metadata_uuid in sb and fs_devices: + * - Normal: + * fs_devices->fsid == fs_devices->metadata_uuid == sb->fsid + * sb->metadata_uuid == 0 + * + * - When the BTRFS_FEATURE_INCOMPAT_METADATA_UUID flag is set: + * fs_devices->fsid == sb->fsid + * fs_devices->metadata_uuid == sb->metadata_uuid + * + * - When in-memory fs_devices->temp_fsid is true + * fs_devices->fsid = random + * fs_devices->metadata_uuid == sb->fsid + */ u8 metadata_uuid[BTRFS_FSID_SIZE]; - bool fsid_change; + struct list_head fs_list; + /* + * Number of devices under this fsid including missing and + * replace-target device and excludes seed devices. + */ u64 num_devices; + + /* + * The number of devices that successfully opened, including + * replace-target, excludes seed devices. + */ u64 open_devices; + + /* The number of devices that are under the chunk allocation list. */ u64 rw_devices; + + /* Count of missing devices under this fsid excluding seed device. */ u64 missing_devices; u64 total_rw_bytes; + + /* + * Count of devices from btrfs_super_block::num_devices for this fsid, + * which includes the seed device, excludes the transient replace-target + * device. + */ u64 total_devices; /* Highest generation number of seen devices */ u64 latest_generation; - struct block_device *latest_bdev; + /* + * The mount device or a device with highest generation after removal + * or replace. + */ + struct btrfs_device *latest_dev; - /* 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. + /* + * All of the devices in the filesystem, protected by a mutex so we can + * safely walk it to write out the super blocks without worrying about + * adding/removing by the multi-device code. Scrubbing super block can + * kick off supers writing by holding this mutex lock. */ struct mutex device_list_mutex; /* List of all devices, protected by device_list_mutex */ struct list_head devices; - /* - * Devices which can satisfy space allocation. Protected by - * chunk_mutex - */ + /* Devices which can satisfy space allocation. Protected by * chunk_mutex. */ struct list_head alloc_list; - struct btrfs_fs_devices *seed; - bool seeding; + struct list_head seed_list; + /* Count fs-devices opened. */ int opened; - /* set when we find or add a device that doesn't have the - * nonrot flag set + /* + * 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. */ + bool discardable; + /* The filesystem is a seed filesystem. */ + 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 */ @@ -264,9 +450,24 @@ struct btrfs_fs_devices { struct completion kobj_unregister; enum btrfs_chunk_allocation_policy chunk_alloc_policy; -}; -#define BTRFS_BIO_INLINE_CSUM_SIZE 64 + /* Policy used to read the mirrored stripes. */ + enum btrfs_read_policy read_policy; + +#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 +}; #define BTRFS_MAX_DEVS(info) ((BTRFS_MAX_ITEM_SIZE(info) \ - sizeof(struct btrfs_chunk)) \ @@ -277,69 +478,119 @@ struct btrfs_fs_devices { - 2 * sizeof(struct btrfs_chunk)) \ / sizeof(struct btrfs_stripe) + 1) -/* - * 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. - */ -struct btrfs_io_bio { - unsigned int mirror_num; - unsigned int stripe_index; - u64 logical; - u8 *csum; - u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE]; - struct bvec_iter iter; - /* - * This member must come last, bio_alloc_bioset will allocate enough - * bytes for entire btrfs_io_bio but relies on bio being last. - */ - struct bio bio; +struct btrfs_io_stripe { + struct btrfs_device *dev; + /* Block mapping. */ + u64 physical; + bool rst_search_commit_root; + /* For the endio handler. */ + struct btrfs_io_context *bioc; }; -static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio) -{ - return container_of(bio, struct btrfs_io_bio, bio); -} - -static inline void btrfs_io_bio_free_csum(struct btrfs_io_bio *io_bio) -{ - if (io_bio->csum != io_bio->csum_inline) { - kfree(io_bio->csum); - io_bio->csum = NULL; - } -} - -struct btrfs_bio_stripe { +struct btrfs_discard_stripe { struct btrfs_device *dev; u64 physical; - u64 length; /* only used for discard mappings */ + u64 length; }; -struct btrfs_bio { +/* + * Context for IO submission for device stripe. + * + * - Track the unfinished mirrors for mirror based profiles + * Mirror based profiles are SINGLE/DUP/RAID1/RAID10. + * + * - Contain the logical -> physical mapping info + * Used by submit_stripe_bio() for mapping logical bio + * into physical device address. + * + * - Contain device replace info + * Used by handle_ops_on_dev_replace() to copy logical bios + * into the new device. + * + * - Contain RAID56 full stripe logical bytenrs + */ +struct btrfs_io_context { refcount_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; + /* Taken from struct btrfs_chunk_map::type. */ + u64 map_type; struct bio *orig_bio; - void *private; atomic_t error; - int max_errors; - int num_stripes; - int mirror_num; - int num_tgtdevs; - int *tgtdev_map; + u16 max_errors; + bool use_rst; + + u64 logical; + u64 size; + /* Raid stripe tree ordered entry. */ + struct list_head rst_ordered_entry; + + /* + * The total number of stripes, including the extra duplicated + * stripe for replace. + */ + u16 num_stripes; + /* - * 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 + * The mirror_num of this bioc. + * + * This is for reads which use 0 as mirror_num, thus we should return a + * valid mirror_num (>0) for the reader. */ - u64 *raid_map; - struct btrfs_bio_stripe stripes[]; + u16 mirror_num; + + /* + * The following two members are for dev-replace case only. + * + * @replace_nr_stripes: Number of duplicated stripes which need to be + * written to replace target. + * Should be <= 2 (2 for DUP, otherwise <= 1). + * @replace_stripe_src: The array indicates where the duplicated stripes + * are from. + * + * The @replace_stripe_src[] array is mostly for RAID56 cases. + * As non-RAID56 stripes share the same contents of the mapped range, + * thus no need to bother where the duplicated ones are from. + * + * But for RAID56 case, all stripes contain different contents, thus + * we need a way to know the mapping. + * + * There is an example for the two members, using a RAID5 write: + * + * num_stripes: 4 (3 + 1 duplicated write) + * stripes[0]: dev = devid 1, physical = X + * stripes[1]: dev = devid 2, physical = Y + * stripes[2]: dev = devid 3, physical = Z + * stripes[3]: dev = devid 0, physical = Y + * + * replace_nr_stripes = 1 + * replace_stripe_src = 1 <- Means stripes[1] is involved in replace. + * The duplicated stripe index would be + * (@num_stripes - 1). + * + * Note, that we can still have cases replace_nr_stripes = 2 for DUP. + * In that case, all stripes share the same content, thus we don't + * need to bother @replace_stripe_src value at all. + */ + u16 replace_nr_stripes; + s16 replace_stripe_src; + /* + * Logical bytenr of the full stripe start, only for RAID56 cases. + * + * When this value is set to other than (u64)-1, the stripes[] should + * follow this pattern: + * + * (real_stripes = num_stripes - replace_nr_stripes) + * (data_stripes = (is_raid6) ? (real_stripes - 2) : (real_stripes - 1)) + * + * stripes[0]: The first data stripe + * stripes[1]: The second data stripe + * ... + * stripes[data_stripes - 1]: The last data stripe + * stripes[data_stripes]: The P stripe + * stripes[data_stripes + 1]: The Q stripe (only for RAID6). + */ + u64 full_stripe_logical; + struct btrfs_io_stripe stripes[]; }; struct btrfs_device_info { @@ -366,22 +617,33 @@ struct btrfs_raid_attr { extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES]; -struct map_lookup { +struct btrfs_chunk_map { + struct rb_node rb_node; + /* For mount time dev extent verification. */ + int verified_stripes; + refcount_t refs; + u64 start; + u64 chunk_len; + u64 stripe_size; u64 type; int io_align; int io_width; - u64 stripe_len; int num_stripes; int sub_stripes; - int verified_stripes; /* For mount time dev extent verification */ - struct btrfs_bio_stripe stripes[]; + struct btrfs_io_stripe stripes[]; }; -#define map_lookup_size(n) (sizeof(struct map_lookup) + \ - (sizeof(struct btrfs_bio_stripe) * (n))) +#define btrfs_chunk_map_size(n) (sizeof(struct btrfs_chunk_map) + \ + (sizeof(struct btrfs_io_stripe) * (n))) + +static inline void btrfs_free_chunk_map(struct btrfs_chunk_map *map) +{ + if (map && refcount_dec_and_test(&map->refs)) { + ASSERT(RB_EMPTY_NODE(&map->rb_node)); + kfree(map); + } +} -struct btrfs_balance_args; -struct btrfs_balance_progress; struct btrfs_balance_control { struct btrfs_balance_args data; struct btrfs_balance_args meta; @@ -392,68 +654,110 @@ struct btrfs_balance_control { struct btrfs_balance_progress stat; }; +/* + * Search for a given device by the set parameters + */ +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; +}; + +/* We have to initialize to -1 because BTRFS_DEV_REPLACE_DEVID is 0 */ +#define BTRFS_DEV_LOOKUP_ARGS_INIT { .devid = (u64)-1 } + +#define BTRFS_DEV_LOOKUP_ARGS(name) \ + struct btrfs_dev_lookup_args name = BTRFS_DEV_LOOKUP_ARGS_INIT + 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) +static inline enum btrfs_map_op btrfs_op(const struct bio *bio) { switch (bio_op(bio)) { - case REQ_OP_DISCARD: - return BTRFS_MAP_DISCARD; case REQ_OP_WRITE: + case REQ_OP_ZONE_APPEND: return BTRFS_MAP_WRITE; default: WARN_ON_ONCE(1); - /* fall through */ + fallthrough; case REQ_OP_READ: return BTRFS_MAP_READ; } } -void btrfs_get_bbio(struct btrfs_bio *bbio); -void btrfs_put_bbio(struct btrfs_bio *bbio); +static inline unsigned long btrfs_chunk_item_size(int num_stripes) +{ + ASSERT(num_stripes); + return sizeof(struct btrfs_chunk) + + sizeof(struct btrfs_stripe) * (num_stripes - 1); +} + +/* + * Do the type safe conversion from stripe_nr to offset inside the chunk. + * + * @stripe_nr is u32, with left shift it can overflow u32 for chunks larger + * than 4G. This does the proper type cast to avoid overflow. + */ +static inline u64 btrfs_stripe_nr_to_offset(u32 stripe_nr) +{ + return (u64)stripe_nr << BTRFS_STRIPE_LEN_SHIFT; +} + +void btrfs_get_bioc(struct btrfs_io_context *bioc); +void btrfs_put_bioc(struct btrfs_io_context *bioc); 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 btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, - u64 logical, u64 len, struct btrfs_io_geometry *io_geom); + struct btrfs_io_context **bioc_ret, + struct btrfs_io_stripe *smap, int *mirror_num_ret); +int btrfs_map_repair_block(struct btrfs_fs_info *fs_info, + struct btrfs_io_stripe *smap, u64 logical, + u32 length, int mirror_num); +struct btrfs_discard_stripe *btrfs_map_discard(struct btrfs_fs_info *fs_info, + u64 logical, u64 *length_ret, + u32 *num_stripes); 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, u64 type); -void btrfs_mapping_tree_free(struct extent_map_tree *tree); -blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio, - int mirror_num); +struct btrfs_block_group *btrfs_create_chunk(struct btrfs_trans_handle *trans, + 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, - fmode_t flags, void *holder); -struct btrfs_device *btrfs_scan_one_device(const char *path, - fmode_t flags, void *holder); -int btrfs_forget_devices(const char *path); -int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); -void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices, int step); + blk_mode_t flags, void *holder); +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); void btrfs_assign_next_active_device(struct btrfs_device *device, struct btrfs_device *this_dev); struct btrfs_device *btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info, u64 devid, const char *devpath); +int btrfs_get_dev_args_from_path(struct btrfs_fs_info *fs_info, + struct btrfs_dev_lookup_args *args, + const char *path); struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info, - const u64 *devid, - const u8 *uuid); -void btrfs_free_device(struct btrfs_device *device); + const u64 *devid, const u8 *uuid, + const char *path); +void btrfs_put_dev_args_from_path(struct btrfs_dev_lookup_args *args); int btrfs_rm_device(struct btrfs_fs_info *fs_info, - const char *device_path, u64 devid); + struct btrfs_dev_lookup_args *args, + struct file **bdev_file); void __exit 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_devices *fs_devices, - u64 devid, u8 *uuid, u8 *fsid, bool seed); +struct btrfs_device *btrfs_find_device(const struct btrfs_fs_devices *fs_devices, + const struct btrfs_dev_lookup_args *args); int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *path); int btrfs_balance(struct btrfs_fs_info *fs_info, @@ -463,30 +767,41 @@ 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, + 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); -int btrfs_chunk_readonly(struct btrfs_fs_info *fs_info, u64 chunk_offset); -int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes, - u64 *start, u64 *max_avail); +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, struct btrfs_ioctl_get_dev_stats *stats); -void btrfs_init_devices_late(struct btrfs_fs_info *fs_info); +int 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); 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); -int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans, - u64 chunk_offset, u64 chunk_size); +u64 btrfs_calc_stripe_length(const struct btrfs_chunk_map *map); +int btrfs_nr_parity_stripes(u64 type); +int btrfs_chunk_alloc_add_chunk_item(struct btrfs_trans_handle *trans, + struct btrfs_block_group *bg); int btrfs_remove_chunk(struct btrfs_trans_handle *trans, u64 chunk_offset); -struct extent_map *btrfs_get_chunk_map(struct btrfs_fs_info *fs_info, - u64 logical, u64 length); + +#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS +struct btrfs_chunk_map *btrfs_alloc_chunk_map(int num_stripes, gfp_t gfp); +int btrfs_add_chunk_map(struct btrfs_fs_info *fs_info, struct btrfs_chunk_map *map); +#endif + +struct btrfs_chunk_map *btrfs_find_chunk_map(struct btrfs_fs_info *fs_info, + u64 logical, u64 length); +struct btrfs_chunk_map *btrfs_find_chunk_map_nolock(struct btrfs_fs_info *fs_info, + u64 logical, u64 length); +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, @@ -540,42 +855,52 @@ static inline void btrfs_dev_stat_set(struct btrfs_device *dev, atomic_inc(&dev->dev_stats_ccnt); } -/* - * Convert block group flags (BTRFS_BLOCK_GROUP_*) to btrfs_raid_types, which - * can be used as index to access btrfs_raid_array[]. - */ -static inline enum btrfs_raid_types btrfs_bg_flags_to_raid_index(u64 flags) +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_dereference(device->name); +} + +static inline void btrfs_warn_unknown_chunk_allocation(enum btrfs_chunk_allocation_policy pol) { - if (flags & BTRFS_BLOCK_GROUP_RAID10) - return BTRFS_RAID_RAID10; - else if (flags & BTRFS_BLOCK_GROUP_RAID1) - return BTRFS_RAID_RAID1; - else if (flags & BTRFS_BLOCK_GROUP_RAID1C3) - return BTRFS_RAID_RAID1C3; - else if (flags & BTRFS_BLOCK_GROUP_RAID1C4) - return BTRFS_RAID_RAID1C4; - else if (flags & BTRFS_BLOCK_GROUP_DUP) - return BTRFS_RAID_DUP; - else if (flags & BTRFS_BLOCK_GROUP_RAID0) - return BTRFS_RAID_RAID0; - else if (flags & BTRFS_BLOCK_GROUP_RAID5) - return BTRFS_RAID_RAID5; - else if (flags & BTRFS_BLOCK_GROUP_RAID6) - return BTRFS_RAID_RAID6; - - return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */ + 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); struct list_head * __attribute_const__ 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); bool btrfs_check_rw_degradable(struct btrfs_fs_info *fs_info, struct btrfs_device *failing_dev); +void btrfs_scratch_superblocks(struct btrfs_fs_info *fs_info, struct btrfs_device *device); +enum btrfs_raid_types __attribute_const__ btrfs_bg_flags_to_raid_index(u64 flags); int btrfs_bg_type_to_factor(u64 flags); const char *btrfs_bg_type_to_raid_name(u64 flags); 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); +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 |