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btrfs: add mount option to set commit interval

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I'ts hardcoded to 30 seconds which is fine for most users. Higher values
defer data being synced to permanent storage with obvious consequences
when the system crashes. The upper bound is not forced, but a warning is
printed if it's more than 300 seconds (5 minutes).

Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
David Sterba
2013-08-01 18:14:52 +02:00
committed by Chris Mason
parent 9ec7267751
commit 8b87dc17fb
3 changed files with 34 additions and 2 deletions
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6
fs/btrfs/disk-io.c
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@@ -1742,7 +1742,7 @@ static int transaction_kthread(void *arg)
do {
cannot_commit = false;
delay = HZ * 30;
delay = HZ * root->fs_info->commit_interval;
mutex_lock(&root->fs_info->transaction_kthread_mutex);
spin_lock(&root->fs_info->trans_lock);
@@ -1754,7 +1754,8 @@ static int transaction_kthread(void *arg)
now = get_seconds();
if (cur->state < TRANS_STATE_BLOCKED &&
(now < cur->start_time || now - cur->start_time < 30)) {
(now < cur->start_time ||
now - cur->start_time < root->fs_info->commit_interval)) {
spin_unlock(&root->fs_info->trans_lock);
delay = HZ * 5;
goto sleep;
@@ -2194,6 +2195,7 @@ int open_ctree(struct super_block *sb,
fs_info->defrag_inodes = RB_ROOT;
fs_info->free_chunk_space = 0;
fs_info->tree_mod_log = RB_ROOT;
fs_info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
/* readahead state */
INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_WAIT);