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authorMiao Xie <miaox@cn.fujitsu.com>2011-01-05 10:07:18 +0000
committerChris Mason <chris.mason@oracle.com>2011-01-16 11:30:19 -0500
commitd52a5b5f1fa40804f681cf9868d4a8f90661bdf3 (patch)
tree93ae0faf84163748353d1edb6c5247483762f2df /fs
parent299a08b1c34f9397797946a0fa215c5fd145c5cf (diff)
downloadop-kernel-dev-d52a5b5f1fa40804f681cf9868d4a8f90661bdf3.zip
op-kernel-dev-d52a5b5f1fa40804f681cf9868d4a8f90661bdf3.tar.gz
btrfs: try to reclaim some space when chunk allocation fails
We cannot write data into files when when there is tiny space in the filesystem. Reproduce steps: # mkfs.btrfs /dev/sda1 # mount /dev/sda1 /mnt # dd if=/dev/zero of=/mnt/tmpfile0 bs=4K count=1 # dd if=/dev/zero of=/mnt/tmpfile1 bs=4K count=99999999999999 (fill the filesystem) # umount /mnt # mount /dev/sda1 /mnt # rm -f /mnt/tmpfile0 # dd if=/dev/zero of=/mnt/tmpfile0 bs=4K count=1 (failed with nospec) But if we do the last step again, we can write data successfully. The reason of the problem is that btrfs didn't try to commit the current transaction and reclaim some space when chunk allocation failed. This patch fixes it by committing the current transaction to reclaim some space when chunk allocation fails. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Reviewed-by: Josef Bacik <josef@redhat.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/extent-tree.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index b180efd..3c71d95 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3162,8 +3162,12 @@ alloc:
bytes + 2 * 1024 * 1024,
alloc_target, 0);
btrfs_end_transaction(trans, root);
- if (ret < 0)
- return ret;
+ if (ret < 0) {
+ if (ret != -ENOSPC)
+ return ret;
+ else
+ goto commit_trans;
+ }
if (!data_sinfo) {
btrfs_set_inode_space_info(root, inode);
@@ -3174,6 +3178,7 @@ alloc:
spin_unlock(&data_sinfo->lock);
/* commit the current transaction and try again */
+commit_trans:
if (!committed && !root->fs_info->open_ioctl_trans) {
committed = 1;
trans = btrfs_join_transaction(root, 1);
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