diff options
Diffstat (limited to 'fs/block_dev.c')
| -rw-r--r-- | fs/block_dev.c | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c index dd769304382e..55dcb7884f4d 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -406,17 +406,23 @@ static loff_t block_llseek(struct file *file, loff_t offset, int origin) int blkdev_fsync(struct file *filp, struct dentry *dentry, int datasync) { - struct block_device *bdev = I_BDEV(filp->f_mapping->host); + struct inode *bd_inode = filp->f_mapping->host; + struct block_device *bdev = I_BDEV(bd_inode); int error; - error = sync_blockdev(bdev); - if (error) - return error; - - error = blkdev_issue_flush(bdev, GFP_KERNEL, NULL, - (BLKDEV_IFL_WAIT)); + /* + * There is no need to serialise calls to blkdev_issue_flush with + * i_mutex and doing so causes performance issues with concurrent + * O_SYNC writers to a block device. + */ + mutex_unlock(&bd_inode->i_mutex); + + error = blkdev_issue_flush(bdev, GFP_KERNEL, NULL, BLKDEV_IFL_WAIT); if (error == -EOPNOTSUPP) error = 0; + + mutex_lock(&bd_inode->i_mutex); + return error; } EXPORT_SYMBOL(blkdev_fsync); |
