diff options
| -rw-r--r-- | fs/btrfs/volumes.c | 60 |
1 files changed, 46 insertions, 14 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 67c3aa8de0b7..58c999311fd6 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -249,10 +249,10 @@ static int init_first_rw_device(struct btrfs_trans_handle *trans); static int btrfs_relocate_sys_chunks(struct btrfs_fs_info *fs_info); static void btrfs_dev_stat_print_on_load(struct btrfs_device *device); static int __btrfs_map_block(struct btrfs_fs_info *fs_info, - enum btrfs_map_op op, - u64 logical, u64 *length, + enum btrfs_map_op op, u64 logical, u64 *length, struct btrfs_io_context **bioc_ret, - int mirror_num, int need_raid_map); + struct btrfs_io_stripe *smap, + int *mirror_num_ret, int need_raid_map); /* * Device locking @@ -6093,7 +6093,7 @@ static int get_extra_mirror_from_replace(struct btrfs_fs_info *fs_info, int ret = 0; ret = __btrfs_map_block(fs_info, BTRFS_MAP_GET_READ_MIRRORS, - logical, &length, &bioc, 0, 0); + logical, &length, &bioc, NULL, NULL, 0); if (ret) { ASSERT(bioc == NULL); return ret; @@ -6350,11 +6350,19 @@ int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, struct extent_map *em, return 0; } +static void set_io_stripe(struct btrfs_io_stripe *dst, const struct map_lookup *map, + u32 stripe_index, u64 stripe_offset, u64 stripe_nr) +{ + dst->dev = map->stripes[stripe_index].dev; + dst->physical = map->stripes[stripe_index].physical + + stripe_offset + stripe_nr * map->stripe_len; +} + static int __btrfs_map_block(struct btrfs_fs_info *fs_info, - enum btrfs_map_op op, - u64 logical, u64 *length, + enum btrfs_map_op op, u64 logical, u64 *length, struct btrfs_io_context **bioc_ret, - int mirror_num, int need_raid_map) + struct btrfs_io_stripe *smap, + int *mirror_num_ret, int need_raid_map) { struct extent_map *em; struct map_lookup *map; @@ -6365,6 +6373,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int data_stripes; int i; int ret = 0; + int mirror_num = (mirror_num_ret ? *mirror_num_ret : 0); int num_stripes; int max_errors = 0; int tgtdev_indexes = 0; @@ -6525,6 +6534,29 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, tgtdev_indexes = num_stripes; } + /* + * If this I/O maps to a single device, try to return the device and + * physical block information on the stack instead of allocating an + * I/O context structure. + */ + if (smap && num_alloc_stripes == 1 && + !((map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) && mirror_num > 1) && + (!need_full_stripe(op) || !dev_replace_is_ongoing || + !dev_replace->tgtdev)) { + if (patch_the_first_stripe_for_dev_replace) { + smap->dev = dev_replace->tgtdev; + smap->physical = physical_to_patch_in_first_stripe; + *mirror_num_ret = map->num_stripes + 1; + } else { + set_io_stripe(smap, map, stripe_index, stripe_offset, + stripe_nr); + *mirror_num_ret = mirror_num; + } + *bioc_ret = NULL; + ret = 0; + goto out; + } + bioc = alloc_btrfs_io_context(fs_info, num_alloc_stripes, tgtdev_indexes); if (!bioc) { ret = -ENOMEM; @@ -6532,9 +6564,8 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, } for (i = 0; i < num_stripes; i++) { - bioc->stripes[i].physical = map->stripes[stripe_index].physical + - stripe_offset + stripe_nr * map->stripe_len; - bioc->stripes[i].dev = map->stripes[stripe_index].dev; + set_io_stripe(&bioc->stripes[i], map, stripe_index, stripe_offset, + stripe_nr); stripe_index++; } @@ -6602,7 +6633,7 @@ int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, struct btrfs_io_context **bioc_ret, int mirror_num) { return __btrfs_map_block(fs_info, op, logical, length, bioc_ret, - mirror_num, 0); + NULL, &mirror_num, 0); } /* For Scrub/replace */ @@ -6610,7 +6641,8 @@ 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) { - return __btrfs_map_block(fs_info, op, logical, length, bioc_ret, 0, 1); + return __btrfs_map_block(fs_info, op, logical, length, bioc_ret, + NULL, NULL, 1); } /* @@ -6820,8 +6852,8 @@ void btrfs_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio, int mirror struct btrfs_io_context *bioc = NULL; btrfs_bio_counter_inc_blocked(fs_info); - ret = __btrfs_map_block(fs_info, btrfs_op(bio), logical, - &map_length, &bioc, mirror_num, 1); + ret = __btrfs_map_block(fs_info, btrfs_op(bio), logical, &map_length, + &bioc, NULL, &mirror_num, 1); if (ret) { btrfs_bio_counter_dec(fs_info); btrfs_bio_end_io(btrfs_bio(bio), errno_to_blk_status(ret)); |