typedef void (*btrfs_bio_end_io_t)(struct btrfs_bio *bbio);
/*
- * Additional info to pass along bio.
- *
- * Mostly for btrfs specific features like csum and mirror_num.
+ * Highlevel btrfs I/O structure. It is allocated by btrfs_bio_alloc and
+ * passed to btrfs_submit_bio for mapping to the physical devices.
*/
struct btrfs_bio {
- unsigned int mirror_num:7;
-
- /*
- * Extra indicator for metadata bios.
- * For some btrfs bios they use pages without a mapping, thus
- * we can not rely on page->mapping->host to determine if
- * it's a metadata bio.
- */
- unsigned int is_metadata:1;
- struct bvec_iter iter;
-
- /* for direct I/O */
+ /* Inode and offset into it that this I/O operates on. */
+ struct btrfs_inode *inode;
u64 file_offset;
- /* @device is for stripe IO submission. */
- struct btrfs_device *device;
union {
- /* For data checksum verification. */
+ /*
+ * Data checksumming and original I/O information for internal
+ * use in the btrfs_submit_bio machinery.
+ */
struct {
u8 *csum;
u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
+ struct bvec_iter saved_iter;
};
/* For metadata parentness verification. */
btrfs_bio_end_io_t end_io;
void *private;
- /* For read end I/O handling */
+ /* For internal use in read end I/O handling */
+ unsigned int mirror_num;
+ atomic_t pending_ios;
struct work_struct end_io_work;
/*
int __init btrfs_bioset_init(void);
void __cold btrfs_bioset_exit(void);
+void btrfs_bio_init(struct btrfs_bio *bbio, struct btrfs_inode *inode,
+ btrfs_bio_end_io_t end_io, void *private);
struct bio *btrfs_bio_alloc(unsigned int nr_vecs, blk_opf_t opf,
+ struct btrfs_inode *inode,
btrfs_bio_end_io_t end_io, void *private);
-struct bio *btrfs_bio_clone_partial(struct bio *orig, u64 offset, u64 size,
- btrfs_bio_end_io_t end_io, void *private);
-
static inline void btrfs_bio_end_io(struct btrfs_bio *bbio, blk_status_t status)
{
bbio->end_io(bbio);
}
-static inline void btrfs_bio_free_csum(struct btrfs_bio *bbio)
-{
- if (bbio->is_metadata)
- return;
- if (bbio->csum != bbio->csum_inline) {
- kfree(bbio->csum);
- bbio->csum = NULL;
- }
-}
+/* Bio only refers to one ordered extent. */
+#define REQ_BTRFS_ONE_ORDERED REQ_DRV
-/*
- * 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))
-
-void btrfs_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
- int mirror_num);
+void btrfs_submit_bio(struct bio *bio, int mirror_num);
int btrfs_repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,
u64 length, u64 logical, struct page *page,
unsigned int pg_offset, int mirror_num);