diff options
Diffstat (limited to 'fs/btrfs/tree-log.c')
| -rw-r--r-- | fs/btrfs/tree-log.c | 46 |
1 files changed, 38 insertions, 8 deletions
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c index fff37c8d96a4..31edc93a383e 100644 --- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -5865,14 +5865,6 @@ static int log_new_dir_dentries(struct btrfs_trans_handle *trans, struct btrfs_inode *curr_inode = start_inode; int ret = 0; - /* - * If we are logging a new name, as part of a link or rename operation, - * don't bother logging new dentries, as we just want to log the names - * of an inode and that any new parents exist. - */ - if (ctx->logging_new_name) - return 0; - path = btrfs_alloc_path(); if (!path) return -ENOMEM; @@ -6051,6 +6043,33 @@ static int conflicting_inode_is_dir(struct btrfs_root *root, u64 ino, return ret; } +static bool can_log_conflicting_inode(const struct btrfs_trans_handle *trans, + const struct btrfs_inode *inode) +{ + if (!S_ISDIR(inode->vfs_inode.i_mode)) + return true; + + if (inode->last_unlink_trans < trans->transid) + return true; + + /* + * If this is a directory and its unlink_trans is not from a past + * transaction then we must fallback to a transaction commit in order + * to avoid getting a directory with 2 hard links after log replay. + * + * This happens if a directory A is renamed, moved from one parent + * directory to another one, a new file is created in the old parent + * directory with the old name of our directory A, the new file is + * fsynced, then we moved the new file to some other parent directory + * and fsync again the new file. This results in a log tree where we + * logged that directory A existed, with the INODE_REF item for the + * new location but without having logged its old parent inode, so + * that on log replay we add a new link for the new location but the + * old link remains, resulting in a link count of 2. + */ + return false; +} + static int add_conflicting_inode(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_path *path, @@ -6154,6 +6173,11 @@ static int add_conflicting_inode(struct btrfs_trans_handle *trans, return 0; } + if (!can_log_conflicting_inode(trans, inode)) { + btrfs_add_delayed_iput(inode); + return BTRFS_LOG_FORCE_COMMIT; + } + btrfs_add_delayed_iput(inode); ino_elem = kmalloc(sizeof(*ino_elem), GFP_NOFS); @@ -6218,6 +6242,12 @@ static int log_conflicting_inodes(struct btrfs_trans_handle *trans, break; } + if (!can_log_conflicting_inode(trans, inode)) { + btrfs_add_delayed_iput(inode); + ret = BTRFS_LOG_FORCE_COMMIT; + break; + } + /* * Always log the directory, we cannot make this * conditional on need_log_inode() because the directory |