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From:   trondmy@gmail.com
To:     linux-nfs@vger.kernel.org
Subject: [PATCH v3 03/17] NFS: Clean up nfs_readdir_page_filler()
Date:   Wed,  4 Nov 2020 11:16:24 -0500
Message-Id: <20201104161638.300324-4-trond.myklebust@hammerspace.com>
In-Reply-To: <20201104161638.300324-3-trond.myklebust@hammerspace.com>
References: <20201104161638.300324-1-trond.myklebust@hammerspace.com>
 <20201104161638.300324-2-trond.myklebust@hammerspace.com>
 <20201104161638.300324-3-trond.myklebust@hammerspace.com>
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From: Trond Myklebust <trond.myklebust@hammerspace.com>

Clean up handling of the case where there are no entries in the readdir
reply.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
 fs/nfs/dir.c | 39 ++++++++++++++++++---------------------
 1 file changed, 18 insertions(+), 21 deletions(-)

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 604ebe015387..68acbde3f914 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -601,16 +601,12 @@ int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *en
 	struct xdr_stream stream;
 	struct xdr_buf buf;
 	struct page *scratch;
-	unsigned int count = 0;
 	int status;
 
 	scratch = alloc_page(GFP_KERNEL);
 	if (scratch == NULL)
 		return -ENOMEM;
 
-	if (buflen == 0)
-		goto out_nopages;
-
 	xdr_init_decode_pages(&stream, &buf, xdr_pages, buflen);
 	xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
 
@@ -619,27 +615,27 @@ int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *en
 			entry->label->len = NFS4_MAXLABELLEN;
 
 		status = xdr_decode(desc, entry, &stream);
-		if (status != 0) {
-			if (status == -EAGAIN)
-				status = 0;
+		if (status != 0)
 			break;
-		}
-
-		count++;
 
 		if (desc->plus)
 			nfs_prime_dcache(file_dentry(desc->file), entry,
 					desc->dir_verifier);
 
 		status = nfs_readdir_add_to_array(entry, page);
-		if (status != 0)
-			break;
-	} while (!entry->eof);
+	} while (!status && !entry->eof);
 
-out_nopages:
-	if (count == 0 || (status == -EBADCOOKIE && entry->eof != 0)) {
-		nfs_readdir_page_set_eof(page);
+	switch (status) {
+	case -EBADCOOKIE:
+		if (entry->eof) {
+			nfs_readdir_page_set_eof(page);
+			status = 0;
+		}
+		break;
+	case -ENOSPC:
+	case -EAGAIN:
 		status = 0;
+		break;
 	}
 
 	put_page(scratch);
@@ -714,14 +710,15 @@ int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page,
 
 		if (status < 0)
 			break;
+
 		pglen = status;
-		status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen);
-		if (status < 0) {
-			if (status == -ENOSPC)
-				status = 0;
+		if (pglen == 0) {
+			nfs_readdir_page_set_eof(page);
 			break;
 		}
-	} while (!nfs_readdir_array_is_full(array));
+
+		status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen);
+	} while (!status && !nfs_readdir_array_is_full(array));
 
 	nfs_readdir_free_pages(pages, array_size);
 out_release_array:
-- 
2.28.0