diff options
| author | David Sterba <dsterba@suse.cz> | 2013-02-09 23:38:06 +0000 |
|---|---|---|
| committer | Josef Bacik <jbacik@fusionio.com> | 2013-02-20 12:59:51 -0500 |
| commit | 210549ebe9047ae5a8cc47487203d3ee16a7749b (patch) | |
| tree | 57c9c8123a46a1170abba0fc476ded82eac442ed /fs/btrfs/transaction.c | |
| parent | b069e0c3450ae388d7a9c94ded6d938a465de262 (diff) | |
| download | linux-210549ebe9047ae5a8cc47487203d3ee16a7749b.tar.bz2 | |
btrfs: add cancellation points to defrag
The defrag operation can take very long, we want to have a way how to
cancel it. The code checks for a pending signal at safe points in the
defrag loops and returns EAGAIN. This means a user can press ^C after
running 'btrfs fi defrag', woks for both defrag modes, files and root.
Returning from the command was instant in my light tests, but may take
longer depending on the aging factor of the filesystem.
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Diffstat (limited to 'fs/btrfs/transaction.c')
| -rw-r--r-- | fs/btrfs/transaction.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index 60481a53e004..d574d830a1c4 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -984,6 +984,12 @@ int btrfs_defrag_root(struct btrfs_root *root) if (btrfs_fs_closing(root->fs_info) || ret != -EAGAIN) break; + + if (btrfs_defrag_cancelled(root->fs_info)) { + printk(KERN_DEBUG "btrfs: defrag_root cancelled\n"); + ret = -EAGAIN; + break; + } } root->defrag_running = 0; return ret; |