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From:   trondmy@kernel.org
To:     linux-nfs@vger.kernel.org
Subject: [PATCH v7 09/21] NFS: Simplify nfs_readdir_xdr_to_array()
Date:   Wed, 23 Feb 2022 16:12:53 -0500
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From: Trond Myklebust <trond.myklebust@hammerspace.com>

Recent changes to readdir mean that we can cope with partially filled
page cache entries, so we no longer need to rely on looping in
nfs_readdir_xdr_to_array().

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
 fs/nfs/dir.c | 29 +++++++++++------------------
 1 file changed, 11 insertions(+), 18 deletions(-)

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 83933b7018ea..9b0f13b52dbf 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -879,6 +879,7 @@ static int nfs_readdir_xdr_to_array(struct nfs_readdir_descriptor *desc,
 	size_t array_size;
 	struct inode *inode = file_inode(desc->file);
 	unsigned int dtsize = desc->dtsize;
+	unsigned int pglen;
 	int status = -ENOMEM;
 
 	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
@@ -896,28 +897,20 @@ static int nfs_readdir_xdr_to_array(struct nfs_readdir_descriptor *desc,
 	if (!pages)
 		goto out;
 
-	do {
-		unsigned int pglen;
-		status = nfs_readdir_xdr_filler(desc, verf_arg, entry->cookie,
-						pages, dtsize,
-						verf_res);
-		if (status < 0)
-			break;
-
-		pglen = status;
-		if (pglen == 0) {
-			nfs_readdir_page_set_eof(page);
-			break;
-		}
-
-		verf_arg = verf_res;
+	status = nfs_readdir_xdr_filler(desc, verf_arg, entry->cookie, pages,
+					dtsize, verf_res);
+	if (status < 0)
+		goto free_pages;
 
+	pglen = status;
+	if (pglen != 0)
 		status = nfs_readdir_page_filler(desc, entry, pages, pglen,
 						 arrays, narrays);
-		desc->buffer_fills++;
-	} while (!status && nfs_readdir_page_needs_filling(page) &&
-		page_mapping(page));
+	else
+		nfs_readdir_page_set_eof(page);
+	desc->buffer_fills++;
 
+free_pages:
 	nfs_readdir_free_pages(pages, array_size);
 out:
 	nfs_free_fattr(entry->fattr);
-- 
2.35.1