diff options
Diffstat (limited to 'fs/btrfs/volumes.h')
| -rw-r--r-- | fs/btrfs/volumes.h | 128 |
1 files changed, 55 insertions, 73 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index 5639961b3626..6b7a05f6cf82 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -6,10 +6,12 @@ #ifndef BTRFS_VOLUMES_H #define BTRFS_VOLUMES_H -#include <linux/bio.h> #include <linux/sort.h> #include <linux/btrfs.h> #include "async-thread.h" +#include "messages.h" +#include "tree-checker.h" +#include "rcu-string.h" #define BTRFS_MAX_DATA_CHUNK_SIZE (10ULL * SZ_1G) @@ -181,6 +183,31 @@ struct btrfs_device { }; /* + * 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; +}; + +/* * If we read those variants at the context of their own lock, we needn't * use the following helpers, reading them directly is safe. */ @@ -329,6 +356,8 @@ struct btrfs_fs_devices { * nonrot flag set */ bool rotating; + /* Devices support TRIM/discard commands */ + bool discardable; struct btrfs_fs_info *fs_info; /* sysfs kobjects */ @@ -343,8 +372,6 @@ struct btrfs_fs_devices { enum btrfs_read_policy read_policy; }; -#define BTRFS_BIO_INLINE_CSUM_SIZE 64 - #define BTRFS_MAX_DEVS(info) ((BTRFS_MAX_ITEM_SIZE(info) \ - sizeof(struct btrfs_chunk)) \ / sizeof(struct btrfs_stripe) + 1) @@ -354,69 +381,6 @@ struct btrfs_fs_devices { - 2 * sizeof(struct btrfs_chunk)) \ / sizeof(struct btrfs_stripe) + 1) -/* - * Maximum number of sectors for a single bio to limit the size of the - * checksum array. This matches the number of bio_vecs per bio and thus the - * I/O size for buffered I/O. - */ -#define BTRFS_MAX_BIO_SECTORS (256) - -/* - * Additional info to pass along bio. - * - * Mostly for btrfs specific features like csum and mirror_num. - */ -struct btrfs_bio { - unsigned int mirror_num; - - /* for direct I/O */ - u64 file_offset; - - /* @device is for stripe IO submission. */ - struct btrfs_device *device; - u8 *csum; - u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE]; - struct bvec_iter iter; - - /* For read end I/O handling */ - struct work_struct end_io_work; - - /* - * This member must come last, bio_alloc_bioset will allocate enough - * bytes for entire btrfs_bio but relies on bio being last. - */ - struct bio bio; -}; - -static inline struct btrfs_bio *btrfs_bio(struct bio *bio) -{ - return container_of(bio, struct btrfs_bio, bio); -} - -static inline void btrfs_bio_free_csum(struct btrfs_bio *bbio) -{ - if (bbio->csum != bbio->csum_inline) { - kfree(bbio->csum); - bbio->csum = NULL; - } -} - -/* - * Iterate through a btrfs_bio (@bbio) on a per-sector basis. - * - * bvl - struct bio_vec - * bbio - struct btrfs_bio - * iters - struct bvec_iter - * bio_offset - unsigned int - */ -#define btrfs_bio_for_each_sector(fs_info, bvl, bbio, iter, bio_offset) \ - for ((iter) = (bbio)->iter, (bio_offset) = 0; \ - (iter).bi_size && \ - (((bvl) = bio_iter_iovec((&(bbio)->bio), (iter))), 1); \ - (bio_offset) += fs_info->sectorsize, \ - bio_advance_iter_single(&(bbio)->bio, &(iter), \ - (fs_info)->sectorsize)) - struct btrfs_io_stripe { struct btrfs_device *dev; union { @@ -451,12 +415,9 @@ struct btrfs_discard_stripe { */ 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; struct bio *orig_bio; - void *private; atomic_t error; int max_errors; int num_stripes; @@ -561,6 +522,13 @@ static inline enum btrfs_map_op btrfs_op(struct bio *bio) } } +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); +} + 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, @@ -569,6 +537,11 @@ int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, u64 logical, u64 *length, struct btrfs_io_context **bioc_ret); +int __btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, + u64 logical, u64 *length, + struct btrfs_io_context **bioc_ret, + struct btrfs_io_stripe *smap, int *mirror_num_ret, + int need_raid_map); struct btrfs_discard_stripe *btrfs_map_discard(struct btrfs_fs_info *fs_info, u64 logical, u64 *length_ret, u32 *num_stripes); @@ -580,7 +553,6 @@ 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); void btrfs_mapping_tree_free(struct extent_map_tree *tree); -void btrfs_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio, int mirror_num); 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, @@ -597,8 +569,8 @@ 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); + const u64 *devid, const u8 *uuid, + const char *path); void btrfs_put_dev_args_from_path(struct btrfs_dev_lookup_args *args); void btrfs_free_device(struct btrfs_device *device); int btrfs_rm_device(struct btrfs_fs_info *fs_info, @@ -629,7 +601,7 @@ int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes, 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); @@ -699,6 +671,14 @@ static inline void btrfs_dev_stat_set(struct btrfs_device *dev, atomic_inc(&dev->dev_stats_ccnt); } +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); +} + void btrfs_commit_device_sizes(struct btrfs_transaction *trans); struct list_head * __attribute_const__ btrfs_get_fs_uuids(void); @@ -714,4 +694,6 @@ 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); + #endif |