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| author | Zhao Lei <zhaolei@cn.fujitsu.com> | 2015-02-16 18:52:17 +0800 |
|---|---|---|
| committer | Chris Mason <clm@fb.com> | 2015-04-13 07:27:18 -0700 |
| commit | f2ab76188ec185dde84e7fe7c533ef2f5d668a32 (patch) | |
| tree | 220b4e911a81b77792f565b2d6ada98cf7950cbf /fs/btrfs/volumes.c | |
| parent | 94b947b2f3f84f3bba25d34c4e2a229fc2276830 (diff) | |
| download | op-kernel-dev-f2ab76188ec185dde84e7fe7c533ef2f5d668a32.zip op-kernel-dev-f2ab76188ec185dde84e7fe7c533ef2f5d668a32.tar.gz | |
btrfs: Fix tail space processing in find_free_dev_extent()
It is another reason for NO_SPACE case.
When we found enough free space in loop and saved them to
max_hole_start/size before, and tail space contains pending extent,
origional innocent max_hole_start/size are reset in retry.
As a result, find_free_dev_extent() returns less space than it can,
and cause NO_SPACE in user program.
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs/volumes.c')
| -rw-r--r-- | fs/btrfs/volumes.c | 24 |
1 files changed, 13 insertions, 11 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index a73acf4..8bcd2a0 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -1134,11 +1134,11 @@ int find_free_dev_extent(struct btrfs_trans_handle *trans, path = btrfs_alloc_path(); if (!path) return -ENOMEM; -again: + max_hole_start = search_start; max_hole_size = 0; - hole_size = 0; +again: if (search_start >= search_end || device->is_tgtdev_for_dev_replace) { ret = -ENOSPC; goto out; @@ -1231,21 +1231,23 @@ next: * allocated dev extents, and when shrinking the device, * search_end may be smaller than search_start. */ - if (search_end > search_start) + if (search_end > search_start) { hole_size = search_end - search_start; - if (hole_size > max_hole_size) { - max_hole_start = search_start; - max_hole_size = hole_size; - } + if (contains_pending_extent(trans, device, &search_start, + hole_size)) { + btrfs_release_path(path); + goto again; + } - if (contains_pending_extent(trans, device, &search_start, hole_size)) { - btrfs_release_path(path); - goto again; + if (hole_size > max_hole_size) { + max_hole_start = search_start; + max_hole_size = hole_size; + } } /* See above. */ - if (hole_size < num_bytes) + if (max_hole_size < num_bytes) ret = -ENOSPC; else ret = 0; |
