diff options
Diffstat (limited to 'fs/btrfs/volumes.c')
-rw-r--r-- | fs/btrfs/volumes.c | 164 |
1 files changed, 138 insertions, 26 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 9d554e8e6583..309a57b9fc85 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -33,17 +33,6 @@ #include "volumes.h" #include "async-thread.h" -struct map_lookup { - u64 type; - int io_align; - int io_width; - int stripe_len; - int sector_size; - int num_stripes; - int sub_stripes; - struct btrfs_bio_stripe stripes[]; -}; - static int init_first_rw_device(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_device *device); @@ -1879,6 +1868,8 @@ static int btrfs_relocate_chunk(struct btrfs_root *root, BUG_ON(ret); + trace_btrfs_chunk_free(root, map, chunk_offset, em->len); + if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) { ret = btrfs_del_sys_chunk(root, chunk_objectid, chunk_offset); BUG_ON(ret); @@ -2606,6 +2597,8 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, *num_bytes = chunk_bytes_by_type(type, calc_size, map->num_stripes, sub_stripes); + trace_btrfs_chunk_alloc(info->chunk_root, map, start, *num_bytes); + em = alloc_extent_map(GFP_NOFS); if (!em) { ret = -ENOMEM; @@ -2714,6 +2707,7 @@ static int __finish_chunk_alloc(struct btrfs_trans_handle *trans, item_size); BUG_ON(ret); } + kfree(chunk); return 0; } @@ -2918,7 +2912,10 @@ static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, struct extent_map_tree *em_tree = &map_tree->map_tree; u64 offset; u64 stripe_offset; + u64 stripe_end_offset; u64 stripe_nr; + u64 stripe_nr_orig; + u64 stripe_nr_end; int stripes_allocated = 8; int stripes_required = 1; int stripe_index; @@ -2927,7 +2924,7 @@ static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, int max_errors = 0; struct btrfs_multi_bio *multi = NULL; - if (multi_ret && !(rw & REQ_WRITE)) + if (multi_ret && !(rw & (REQ_WRITE | REQ_DISCARD))) stripes_allocated = 1; again: if (multi_ret) { @@ -2968,7 +2965,15 @@ again: max_errors = 1; } } - if (multi_ret && (rw & REQ_WRITE) && + if (rw & REQ_DISCARD) { + if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | + BTRFS_BLOCK_GROUP_RAID1 | + BTRFS_BLOCK_GROUP_DUP | + BTRFS_BLOCK_GROUP_RAID10)) { + stripes_required = map->num_stripes; + } + } + if (multi_ret && (rw & (REQ_WRITE | REQ_DISCARD)) && stripes_allocated < stripes_required) { stripes_allocated = map->num_stripes; free_extent_map(em); @@ -2988,12 +2993,15 @@ again: /* stripe_offset is the offset of this block in its stripe*/ stripe_offset = offset - stripe_offset; - if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 | - BTRFS_BLOCK_GROUP_RAID10 | - BTRFS_BLOCK_GROUP_DUP)) { + if (rw & REQ_DISCARD) + *length = min_t(u64, em->len - offset, *length); + else if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | + BTRFS_BLOCK_GROUP_RAID1 | + BTRFS_BLOCK_GROUP_RAID10 | + BTRFS_BLOCK_GROUP_DUP)) { /* we limit the length of each bio to what fits in a stripe */ *length = min_t(u64, em->len - offset, - map->stripe_len - stripe_offset); + map->stripe_len - stripe_offset); } else { *length = em->len - offset; } @@ -3003,8 +3011,19 @@ again: num_stripes = 1; stripe_index = 0; - if (map->type & BTRFS_BLOCK_GROUP_RAID1) { - if (rw & REQ_WRITE) + stripe_nr_orig = stripe_nr; + stripe_nr_end = (offset + *length + map->stripe_len - 1) & + (~(map->stripe_len - 1)); + do_div(stripe_nr_end, map->stripe_len); + stripe_end_offset = stripe_nr_end * map->stripe_len - + (offset + *length); + if (map->type & BTRFS_BLOCK_GROUP_RAID0) { + if (rw & REQ_DISCARD) + num_stripes = min_t(u64, map->num_stripes, + stripe_nr_end - stripe_nr_orig); + stripe_index = do_div(stripe_nr, map->num_stripes); + } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) { + if (rw & (REQ_WRITE | REQ_DISCARD)) num_stripes = map->num_stripes; else if (mirror_num) stripe_index = mirror_num - 1; @@ -3015,7 +3034,7 @@ again: } } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { - if (rw & REQ_WRITE) + if (rw & (REQ_WRITE | REQ_DISCARD)) num_stripes = map->num_stripes; else if (mirror_num) stripe_index = mirror_num - 1; @@ -3028,6 +3047,10 @@ again: if (rw & REQ_WRITE) num_stripes = map->sub_stripes; + else if (rw & REQ_DISCARD) + num_stripes = min_t(u64, map->sub_stripes * + (stripe_nr_end - stripe_nr_orig), + map->num_stripes); else if (mirror_num) stripe_index += mirror_num - 1; else { @@ -3045,12 +3068,101 @@ again: } BUG_ON(stripe_index >= map->num_stripes); - for (i = 0; i < num_stripes; i++) { - multi->stripes[i].physical = - map->stripes[stripe_index].physical + - stripe_offset + stripe_nr * map->stripe_len; - multi->stripes[i].dev = map->stripes[stripe_index].dev; - stripe_index++; + if (rw & REQ_DISCARD) { + for (i = 0; i < num_stripes; i++) { + multi->stripes[i].physical = + map->stripes[stripe_index].physical + + stripe_offset + stripe_nr * map->stripe_len; + multi->stripes[i].dev = map->stripes[stripe_index].dev; + + if (map->type & BTRFS_BLOCK_GROUP_RAID0) { + u64 stripes; + u32 last_stripe = 0; + int j; + + div_u64_rem(stripe_nr_end - 1, + map->num_stripes, + &last_stripe); + + for (j = 0; j < map->num_stripes; j++) { + u32 test; + + div_u64_rem(stripe_nr_end - 1 - j, + map->num_stripes, &test); + if (test == stripe_index) + break; + } + stripes = stripe_nr_end - 1 - j; + do_div(stripes, map->num_stripes); + multi->stripes[i].length = map->stripe_len * + (stripes - stripe_nr + 1); + + if (i == 0) { + multi->stripes[i].length -= + stripe_offset; + stripe_offset = 0; + } + if (stripe_index == last_stripe) + multi->stripes[i].length -= + stripe_end_offset; + } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { + u64 stripes; + int j; + int factor = map->num_stripes / + map->sub_stripes; + u32 last_stripe = 0; + + div_u64_rem(stripe_nr_end - 1, + factor, &last_stripe); + last_stripe *= map->sub_stripes; + + for (j = 0; j < factor; j++) { + u32 test; + + div_u64_rem(stripe_nr_end - 1 - j, + factor, &test); + + if (test == + stripe_index / map->sub_stripes) + break; + } + stripes = stripe_nr_end - 1 - j; + do_div(stripes, factor); + multi->stripes[i].length = map->stripe_len * + (stripes - stripe_nr + 1); + + if (i < map->sub_stripes) { + multi->stripes[i].length -= + stripe_offset; + if (i == map->sub_stripes - 1) + stripe_offset = 0; + } + if (stripe_index >= last_stripe && + stripe_index <= (last_stripe + + map->sub_stripes - 1)) { + multi->stripes[i].length -= + stripe_end_offset; + } + } else + multi->stripes[i].length = *length; + + stripe_index++; + if (stripe_index == map->num_stripes) { + /* This could only happen for RAID0/10 */ + stripe_index = 0; + stripe_nr++; + } + } + } else { + for (i = 0; i < num_stripes; i++) { + multi->stripes[i].physical = + map->stripes[stripe_index].physical + + stripe_offset + + stripe_nr * map->stripe_len; + multi->stripes[i].dev = + map->stripes[stripe_index].dev; + stripe_index++; + } } if (multi_ret) { *multi_ret = multi; |