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btrfs: do commit in sync_fs if there are pending changes

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If a pending change is requested, it's not processed unless there is a
transaction commit about to happen, not even after sync or SYNC_FS
ioctl. For example a remount that toggles the inode_cache option will
not take effect after sync on a quiescent filesystem.

Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
David Sterba 2014-03-28 17:38:48 +01:00
parent 572d9ab784
commit 6b5fe46dfa
1 changed files with 11 additions and 3 deletions
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14
fs/btrfs/super.c
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@ -993,9 +993,17 @@ int btrfs_sync_fs(struct super_block *sb, int wait)
trans = btrfs_attach_transaction_barrier(root);
if (IS_ERR(trans)) {
/* no transaction, don't bother */
if (PTR_ERR(trans) == -ENOENT)
return 0;
return PTR_ERR(trans);
if (PTR_ERR(trans) == -ENOENT) {
/*
* Exit unless we have some pending changes
* that need to go through commit
*/
if (fs_info->pending_changes == 0)
return 0;
trans = btrfs_start_transaction(root, 0);
} else {
return PTR_ERR(trans);
}
}
return btrfs_commit_transaction(trans, root);
}