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Add O_SYNC support to btrfs_file_write 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-10-29 14:36:41 -04:00
parent b56baf5bed
commit 2ff3e9b61d
1 changed files with 13 additions and 2 deletions
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15
fs/btrfs/file.c
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@ -635,8 +635,9 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
loff_t pos;
size_t num_written = 0;
int err = 0;
loff_t start_pos;
ssize_t num_written = 0;
ssize_t err = 0;
int ret = 0;
struct inode *inode = file->f_path.dentry->d_inode;
struct btrfs_root *root = BTRFS_I(inode)->root;
@ -652,7 +653,10 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
pinned[1] = NULL;
if (file->f_flags & O_DIRECT)
return -EINVAL;
pos = *ppos;
start_pos = pos;
vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
current->backing_dev_info = inode->i_mapping->backing_dev_info;
err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
@ -743,6 +747,13 @@ out:
if (pinned[1])
page_cache_release(pinned[1]);
*ppos = pos;
if (num_written > 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) {
err = sync_page_range(inode, inode->i_mapping,
start_pos, num_written);
if (err < 0)
num_written = err;
}
current->backing_dev_info = NULL;
return num_written ? num_written : err;
}