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| author | Filipe Manana <fdmanana@suse.com> | 2019-04-29 13:08:14 +0100 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2019-05-09 11:25:27 +0200 |
| commit | 72bd2323ec87722c115a5906bc6a1b31d11e8f54 (patch) | |
| tree | 98542af39b8ce6b6894e45bf122e5acf115f407b /fs/btrfs | |
| parent | d7400ee1b476f201f8fb4264887d18bdb23ee352 (diff) | |
| download | linux-72bd2323ec87722c115a5906bc6a1b31d11e8f54.tar.bz2 | |
Btrfs: do not abort transaction at btrfs_update_root() after failure to COW path
Currently when we fail to COW a path at btrfs_update_root() we end up
always aborting the transaction. However all the current callers of
btrfs_update_root() are able to deal with errors returned from it, many do
end up aborting the transaction themselves (directly or not, such as the
transaction commit path), other BUG_ON() or just gracefully cancel whatever
they were doing.
When syncing the fsync log, we call btrfs_update_root() through
tree-log.c:update_log_root(), and if it returns an -ENOSPC error, the log
sync code does not abort the transaction, instead it gracefully handles
the error and returns -EAGAIN to the fsync handler, so that it falls back
to a transaction commit. Any other error different from -ENOSPC, makes the
log sync code abort the transaction.
So remove the transaction abort from btrfs_update_log() when we fail to
COW a path to update the root item, so that if an -ENOSPC failure happens
we avoid aborting the current transaction and have a chance of the fsync
succeeding after falling back to a transaction commit.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=203413
Fixes: 79787eaab46121 ("btrfs: replace many BUG_ONs with proper error handling")
Cc: stable@vger.kernel.org # 4.4+
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/root-tree.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c index 1b9a5d0de139..22124122728c 100644 --- a/fs/btrfs/root-tree.c +++ b/fs/btrfs/root-tree.c @@ -132,10 +132,8 @@ int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root return -ENOMEM; ret = btrfs_search_slot(trans, root, key, path, 0, 1); - if (ret < 0) { - btrfs_abort_transaction(trans, ret); + if (ret < 0) goto out; - } if (ret > 0) { btrfs_crit(fs_info, |