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| author | Sage Weil <sage@newdream.net> | 2009-04-02 16:59:01 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2009-04-02 16:59:01 -0400 |
| commit | dccae99995089641fbac452ebc7f0cab18751ddb (patch) | |
| tree | c8f3611cc62baa6fa02baff18374d8f3a61b06bf /fs/btrfs/transaction.c | |
| parent | 3a5e14048a0a81276d284cbda441507a17e26147 (diff) | |
| download | lwn-dccae99995089641fbac452ebc7f0cab18751ddb.tar.gz lwn-dccae99995089641fbac452ebc7f0cab18751ddb.zip | |
Btrfs: add flushoncommit mount option
The 'flushoncommit' mount option forces any data dirtied by a write in a
prior transaction to commit as part of the current commit. This makes
the committed state a fully consistent view of the file system from the
application's perspective (i.e., it includes all completed file system
operations). This was previously the behavior only when a snapshot is
created.
This is used by Ceph to ensure that completed writes make it to the
platter along with the metadata operations they are bound to (by
BTRFS_IOC_TRANS_{START,END}).
Signed-off-by: Sage Weil <sage@newdream.net>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/transaction.c')
| -rw-r--r-- | fs/btrfs/transaction.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index 3e8225de4e9d..2869b3361eb6 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -972,6 +972,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans, int ret; int should_grow = 0; unsigned long now = get_seconds(); + int flush_on_commit = btrfs_test_opt(root, FLUSHONCOMMIT); btrfs_run_ordered_operations(root, 0); @@ -1051,7 +1052,9 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans, mutex_unlock(&root->fs_info->trans_mutex); - if (snap_pending) { + if (flush_on_commit || snap_pending) { + if (flush_on_commit) + btrfs_start_delalloc_inodes(root); ret = btrfs_wait_ordered_extents(root, 1); BUG_ON(ret); } |