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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>
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@ -504,8 +504,12 @@ try_again:
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for (subreq = head->wb_this_page; subreq != head;
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for (subreq = head->wb_this_page; subreq != head;
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subreq = subreq->wb_this_page) {
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subreq = subreq->wb_this_page) {
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if (!kref_get_unless_zero(&subreq->wb_kref))
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if (!kref_get_unless_zero(&subreq->wb_kref)) {
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if (subreq->wb_offset == head->wb_offset + total_bytes)
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total_bytes += subreq->wb_bytes;
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continue;
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continue;
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}
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while (!nfs_lock_request(subreq)) {
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while (!nfs_lock_request(subreq)) {
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/*
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/*
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* Unlock page to allow nfs_page_group_sync_on_bit()
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* Unlock page to allow nfs_page_group_sync_on_bit()
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