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Subject[PATCH 6/7] xfs: propagate issue-flush error code
blkdev_issue_flush() may fail (i.e. due to media error on FLUSH CACHE
command execution) so its users should check for the return value.

(This issues was first spotted Bartlomiej Zolnierkiewicz)

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
---
diff -urNp linux-2.6.29-orig/fs/xfs/linux-2.6/xfs_buf.c linux-2.6.29/fs/xfs/linux-2.6/xfs_buf.c
--- linux-2.6.29-orig/fs/xfs/linux-2.6/xfs_buf.c 2009-03-24 08:12:14.000000000 +0900
+++ linux-2.6.29/fs/xfs/linux-2.6/xfs_buf.c 2009-03-30 14:44:34.000000000 +0900
@@ -1446,6 +1446,7 @@ xfs_free_buftarg(
{
xfs_flush_buftarg(btp, 1);
if (mp->m_flags & XFS_MOUNT_BARRIER)
+ /* FIXME: check return value */
xfs_blkdev_issue_flush(btp);
xfs_free_bufhash(btp);
iput(btp->bt_mapping->host);
diff -urNp linux-2.6.29-orig/fs/xfs/linux-2.6/xfs_super.c linux-2.6.29/fs/xfs/linux-2.6/xfs_super.c
--- linux-2.6.29-orig/fs/xfs/linux-2.6/xfs_super.c 2009-03-24 08:12:14.000000000 +0900
+++ linux-2.6.29/fs/xfs/linux-2.6/xfs_super.c 2009-03-30 15:16:42.000000000 +0900
@@ -721,11 +721,11 @@ xfs_mountfs_check_barriers(xfs_mount_t *
}
}

-void
+int
xfs_blkdev_issue_flush(
xfs_buftarg_t *buftarg)
{
- blkdev_issue_flush(buftarg->bt_bdev, NULL);
+ return block_flush_device(buftarg->bt_bdev);
}

STATIC void
diff -urNp linux-2.6.29-orig/fs/xfs/linux-2.6/xfs_super.h linux-2.6.29/fs/xfs/linux-2.6/xfs_super.h
--- linux-2.6.29-orig/fs/xfs/linux-2.6/xfs_super.h 2009-03-24 08:12:14.000000000 +0900
+++ linux-2.6.29/fs/xfs/linux-2.6/xfs_super.h 2009-03-30 14:46:31.000000000 +0900
@@ -89,7 +89,7 @@ struct block_device;

extern __uint64_t xfs_max_file_offset(unsigned int);

-extern void xfs_blkdev_issue_flush(struct xfs_buftarg *);
+extern int xfs_blkdev_issue_flush(struct xfs_buftarg *);

extern const struct export_operations xfs_export_operations;
extern struct xattr_handler *xfs_xattr_handlers[];
diff -urNp linux-2.6.29-orig/fs/xfs/xfs_vnodeops.c linux-2.6.29/fs/xfs/xfs_vnodeops.c
--- linux-2.6.29-orig/fs/xfs/xfs_vnodeops.c 2009-03-24 08:12:14.000000000 +0900
+++ linux-2.6.29/fs/xfs/xfs_vnodeops.c 2009-03-30 15:08:21.000000000 +0900
@@ -678,20 +678,20 @@ xfs_fsync(
xfs_iunlock(ip, XFS_ILOCK_EXCL);
}

- if ((ip->i_mount->m_flags & XFS_MOUNT_BARRIER) && changed) {
+ if (!error && (ip->i_mount->m_flags & XFS_MOUNT_BARRIER) && changed) {
/*
* If the log write didn't issue an ordered tag we need
* to flush the disk cache for the data device now.
*/
if (!log_flushed)
- xfs_blkdev_issue_flush(ip->i_mount->m_ddev_targp);
+ error = xfs_blkdev_issue_flush(ip->i_mount->m_ddev_targp);

/*
* If this inode is on the RT dev we need to flush that
* cache as well.
*/
- if (XFS_IS_REALTIME_INODE(ip))
- xfs_blkdev_issue_flush(ip->i_mount->m_rtdev_targp);
+ if (!error && XFS_IS_REALTIME_INODE(ip))
+ error = xfs_blkdev_issue_flush(ip->i_mount->m_rtdev_targp);
}

return error;

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