From: Weston Andros Adamson <dros@xxxxxxxxxxxxxxx>
This is needed for mirrored DS support, where multuple requests
cover the same range.
Signed-off-by: Weston Andros Adamson <dros@xxxxxxxxxxxxxxx>
---
fs/nfs/write.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 8800bd3..e997457 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -473,13 +473,18 @@ try_again:
do {
/*
* Subrequests are always contiguous, non overlapping
- * and in order. If not, it's a programming error.
+ * and in order - but may be repeated (mirrored writes).
*/
- WARN_ON_ONCE(subreq->wb_offset !=
- (head->wb_offset + total_bytes));
-
- /* keep track of how many bytes this group covers */
- total_bytes += subreq->wb_bytes;
+ if (subreq->wb_offset == (head->wb_offset + total_bytes)) {
+ /* keep track of how many bytes this group covers */
+ total_bytes += subreq->wb_bytes;
+ } else if (WARN_ON_ONCE(subreq->wb_offset < head->wb_offset ||
+ ((subreq->wb_offset + subreq->wb_bytes) >
+ (head->wb_offset + total_bytes)))) {
+ nfs_page_group_unlock(head);
+ spin_unlock(&inode->i_lock);
+ return ERR_PTR(-EIO);
+ }
if (!nfs_lock_request(subreq)) {
/* releases page group bit lock and
--
1.9.3
--
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