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Btrfs: check to see if the inode is in the log before fsyncing 

We have this check down in the actual logging code, but this is after we
start a transaction and all that good stuff.  So move the helper
inode_in_log() out so we can call it in fsync() and avoid starting a
transaction altogether and just exit if we've already fsync()'ed this file
recently.  You would notice this issue if you fsync()'ed a file over and
over again until the transaction committed.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
This commit is contained in:
Josef Bacik 2012-05-29 16:57:49 -04:00
parent 018642a1f1
commit 22ee6985de
3 changed files with 16 additions and 17 deletions
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13
fs/btrfs/btrfs_inode.h
View File

@ -199,4 +199,17 @@ static inline bool btrfs_is_free_space_inode(struct btrfs_root *root,
return false;
}
static inline int btrfs_inode_in_log(struct inode *inode, u64 generation)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
int ret = 0;
mutex_lock(&root->log_mutex);
if (BTRFS_I(inode)->logged_trans == generation &&
BTRFS_I(inode)->last_sub_trans <= root->last_log_commit)
ret = 1;
mutex_unlock(&root->log_mutex);
return ret;
}
#endif

3
fs/btrfs/file.c
View File

@ -1552,7 +1552,8 @@ int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
* syncing
*/
smp_mb();
if (BTRFS_I(inode)->last_trans <=
if (btrfs_inode_in_log(inode, root->fs_info->generation) ||
BTRFS_I(inode)->last_trans <=
root->fs_info->last_trans_committed) {
BTRFS_I(inode)->last_trans = 0;
mutex_unlock(&inode->i_mutex);

17
fs/btrfs/tree-log.c
View File

@ -3038,21 +3038,6 @@ out:
return ret;
}
static int inode_in_log(struct btrfs_trans_handle *trans,
struct inode *inode)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
int ret = 0;
mutex_lock(&root->log_mutex);
if (BTRFS_I(inode)->logged_trans == trans->transid &&
BTRFS_I(inode)->last_sub_trans <= root->last_log_commit)
ret = 1;
mutex_unlock(&root->log_mutex);
return ret;
}
/*
* helper function around btrfs_log_inode to make sure newly created
* parent directories also end up in the log. A minimal inode and backref
@ -3093,7 +3078,7 @@ int btrfs_log_inode_parent(struct btrfs_trans_handle *trans,
if (ret)
goto end_no_trans;
if (inode_in_log(trans, inode)) {
if (btrfs_inode_in_log(inode, trans->transid)) {
ret = BTRFS_NO_LOG_SYNC;
goto end_no_trans;
}