nfs: add debug to directio "good_bytes" counting
This will pop a warning if we count too many good bytes. Signed-off-by: Weston Andros Adamson <dros@primarydata.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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@ -87,6 +87,7 @@ struct nfs_direct_req {
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int mirror_count;
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ssize_t count, /* bytes actually processed */
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max_count, /* max expected count */
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bytes_left, /* bytes left to be sent */
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io_start, /* start of IO */
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error; /* any reported error */
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@ -123,6 +124,8 @@ nfs_direct_good_bytes(struct nfs_direct_req *dreq, struct nfs_pgio_header *hdr)
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int i;
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ssize_t count;
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WARN_ON_ONCE(dreq->count >= dreq->max_count);
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if (dreq->mirror_count == 1) {
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dreq->mirrors[hdr->pgio_mirror_idx].count += hdr->good_bytes;
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dreq->count += hdr->good_bytes;
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@ -593,7 +596,7 @@ ssize_t nfs_file_direct_read(struct kiocb *iocb, struct iov_iter *iter,
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goto out_unlock;
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dreq->inode = inode;
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dreq->bytes_left = count;
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dreq->bytes_left = dreq->max_count = count;
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dreq->io_start = pos;
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dreq->ctx = get_nfs_open_context(nfs_file_open_context(iocb->ki_filp));
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l_ctx = nfs_get_lock_context(dreq->ctx);
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@ -1026,7 +1029,7 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter)
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goto out_unlock;
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dreq->inode = inode;
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dreq->bytes_left = iov_iter_count(iter);
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dreq->bytes_left = dreq->max_count = iov_iter_count(iter);
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dreq->io_start = pos;
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dreq->ctx = get_nfs_open_context(nfs_file_open_context(iocb->ki_filp));
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l_ctx = nfs_get_lock_context(dreq->ctx);
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