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btrfs: Fix early enospc because 'unused' calculated with wrong sign.

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'unused' calculated with wrong sign in reserve_metadata_bytes().
This might have lead to unwanted over-reservations.

Signed-off-by: Arne Jansen <sensille@gmx.net>
Reviewed-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Arne Jansen 2010-11-12 23:17:56 +00:00 committed by Chris Mason
parent e65e153554
commit 6f33434850
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/extent-tree.c
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@ -3413,7 +3413,7 @@ again:
* our reservation.
*/
if (unused <= space_info->total_bytes) {
unused -= space_info->total_bytes;
unused = space_info->total_bytes - unused;
if (unused >= num_bytes) {
if (!reserved)
space_info->bytes_reserved += orig_bytes;