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btrfs: wake up transaction thread from SYNC_FS ioctl

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The transaction thread may want to do more work, namely it pokes the
cleaner ktread that will start processing uncleaned subvols.

This can be triggered by user via the 'btrfs fi sync' command, otherwise
there was a delay up to 30 seconds before the cleaner started to clean
old snapshots.

Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
David Sterba 2014-07-23 14:39:35 +02:00 committed by Chris Mason
parent c01a5c074c
commit 2fad4e83e1
1 changed files with 6 additions and 0 deletions
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6
fs/btrfs/ioctl.c
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@ -5288,6 +5288,12 @@ long btrfs_ioctl(struct file *file, unsigned int
if (ret)
return ret;
ret = btrfs_sync_fs(file->f_dentry->d_sb, 1);
/*
* The transaction thread may want to do more work,
* namely it pokes the cleaner ktread that will start
* processing uncleaned subvols.
*/
wake_up_process(root->fs_info->transaction_kthread);
return ret;
}
case BTRFS_IOC_START_SYNC: