Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

[pandora-kernel.git] / fs / block_dev.c

diff --git a/fs/block_dev.c b/fs/block_dev.c
index d11d028..6dcee88 100644 (file)
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -404,20 +404,28 @@ static loff_t block_llseek(struct file *file, loff_t offset, int origin)
  *     NULL first argument is nfsd_sync_dir() and that's not a directory.
  */
  
-static int block_fsync(struct file *filp, struct dentry *dentry, int datasync)
+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;
-       
+       /*
+        * 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, NULL);
        if (error == -EOPNOTSUPP)
                error = 0;
+
+       mutex_lock(&bd_inode->i_mutex);
+
        return error;
 }
+EXPORT_SYMBOL(blkdev_fsync);
 
 /*
  * pseudo-fs
@@ -1481,7 +1489,7 @@ const struct file_operations def_blk_fops = {
        .aio_read       = generic_file_aio_read,
        .aio_write      = blkdev_aio_write,
        .mmap           = generic_file_mmap,
-       .fsync          = block_fsync,
+       .fsync          = blkdev_fsync,
        .unlocked_ioctl = block_ioctl,
 #ifdef CONFIG_COMPAT
        .compat_ioctl   = compat_blkdev_ioctl,