linux-ext4 - [PATCH 3/3] nfsd: vfs_llseek() with O_32BITHASH or O

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Message-ID: <20110727110259.204979.56782.stgit@localhost.localdomain>
Date:	Wed, 27 Jul 2011 13:02:59 +0200
From:	Bernd Schubert <bernd.schubert@...m.fraunhofer.de>
To:	linux-nfs@...r.kernel.org, linux-ext4@...r.kernel.org
Cc:	linux-fsdevel@...r.kernel.org, yong.fan@...mcloud.com,
	adilger@...mcloud.com, tytso@....edu
Subject: [PATCH 3/3] nfsd: vfs_llseek() with O_32BITHASH or O_64BITHASH

Use 32-bit or 64-bit llseek() hashes for directory offsets depending on
the NFS version. NFSv2 gets 32-bit hashes only.

Signed-off-by: Bernd Schubert <bernd.schubert@...m.fraunhofer.de>
---
 fs/nfsd/vfs.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index fd0acca..d79bbcd 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1994,6 +1994,12 @@ nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp,
 	if (err)
 		goto out;
 
+	/* NFSv2 only supports 32 bit cookies */
+	if (rqstp->rq_vers > 2)
+		file->f_flags &= O_64BITHASH;
+	else
+		file->f_flags &= O_32BITHASH;
+
 	offset = vfs_llseek(file, offset, 0);
 	if (offset < 0) {
 		err = nfserrno((int)offset);

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