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NFS: Count the bytes of skipped subrequests in nfs_lock_and_join_requests() 

If we skip a subrequest due to a zero refcount, we should still count
the byte range that it covered so that we accurately reconstruct the
original request size.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2017-09-09 16:43:09 -04:00
parent 8b77484f2b
commit 1bd5d6d08e
1 changed files with 5 additions and 1 deletions
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6
fs/nfs/write.c
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@ -504,8 +504,12 @@ try_again:
for (subreq = head->wb_this_page; subreq != head;
subreq = subreq->wb_this_page) {
if (!kref_get_unless_zero(&subreq->wb_kref))
if (!kref_get_unless_zero(&subreq->wb_kref)) {
if (subreq->wb_offset == head->wb_offset + total_bytes)
total_bytes += subreq->wb_bytes;
continue;
}
while (!nfs_lock_request(subreq)) {
/*
* Unlock page to allow nfs_page_group_sync_on_bit()