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authorFilipe Manana <fdmanana@suse.com>2016-04-29 11:34:22 +0100
committerFilipe Manana <fdmanana@suse.com>2016-05-13 01:59:18 +0100
commit3dc9e8f76720fbbd9c56a11775932733fe13d214 (patch)
treeda778eb649c5ba5fada99372055777fd62ae09f7
parent9cfa3e34e20e6798a671236000d9e97c8aa5d318 (diff)
Btrfs: unpin log if rename operation fails
If rename operations fail at some point after we pinned the log, we end up aborting the current transaction but never unpin the log, which leaves concurrent tasks that are trying to sync the log (as part of an fsync request from user space) blocked forever and preventing the filesystem from being unmountable. Fix this by safely unpinning the log. Signed-off-by: Filipe Manana <fdmanana@suse.com>
-rw-r--r--fs/btrfs/inode.c28
1 files changed, 27 insertions, 1 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 3991d8a74f61..4594a263a5f8 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -9406,6 +9406,7 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
u64 root_objectid;
int ret;
u64 old_ino = btrfs_ino(old_inode);
+ bool log_pinned = false;
if (btrfs_ino(new_dir) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)
return -EPERM;
@@ -9493,6 +9494,7 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
* we unlink the name but before we add the new name back in.
*/
btrfs_pin_log_trans(root);
+ log_pinned = true;
}
inode_inc_iversion(old_dir);
@@ -9559,12 +9561,36 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
if (old_inode->i_nlink == 1)
BTRFS_I(old_inode)->dir_index = index;
- if (old_ino != BTRFS_FIRST_FREE_OBJECTID) {
+ if (log_pinned) {
struct dentry *parent = new_dentry->d_parent;
+
btrfs_log_new_name(trans, old_inode, old_dir, parent);
btrfs_end_log_trans(root);
+ log_pinned = false;
}
out_fail:
+ /*
+ * If we have pinned the log and an error happened, we unpin tasks
+ * trying to sync the log and force them to fallback to a transaction
+ * commit if the log currently contains any of the inodes involved in
+ * this rename operation (to ensure we do not persist a log with an
+ * inconsistent state for any of these inodes or leading to any
+ * inconsistencies when replayed). If the transaction was aborted, the
+ * abortion reason is propagated to userspace when attempting to commit
+ * the transaction. If the log does not contain any of these inodes, we
+ * allow the tasks to sync it.
+ */
+ if (ret && log_pinned) {
+ if (btrfs_inode_in_log(old_dir, root->fs_info->generation) ||
+ btrfs_inode_in_log(new_dir, root->fs_info->generation) ||
+ btrfs_inode_in_log(old_inode, root->fs_info->generation) ||
+ (new_inode &&
+ btrfs_inode_in_log(new_inode, root->fs_info->generation)))
+ btrfs_set_log_full_commit(root->fs_info, trans);
+
+ btrfs_end_log_trans(root);
+ log_pinned = false;
+ }
btrfs_end_transaction(trans, root);
out_notrans:
if (old_ino == BTRFS_FIRST_FREE_OBJECTID)