Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758073AbaDVU5s (ORCPT ); Tue, 22 Apr 2014 16:57:48 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:36457 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756285AbaDVUWc (ORCPT ); Tue, 22 Apr 2014 16:22:32 -0400 From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: "J. Bruce Fields" , Kamal Mostafa Subject: [PATCH 3.8 097/133] nfsd: notify_change needs elevated write count Date: Tue, 22 Apr 2014 13:13:55 -0700 Message-Id: <1398197671-12786-98-git-send-email-kamal@canonical.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1398197671-12786-1-git-send-email-kamal@canonical.com> References: <1398197671-12786-1-git-send-email-kamal@canonical.com> X-Extended-Stable: 3.8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.8.13.22 -stable review patch. If anyone has any objections, please let me know. ------------------ From: "J. Bruce Fields" commit 9f67f189939eccaa54f3d2c9cf10788abaf2d584 upstream. Looks like this bug has been here since these write counts were introduced, not sure why it was just noticed now. Thanks also to Jan Kara for pointing out the problem. Reported-by: Matthew Rahtz Signed-off-by: J. Bruce Fields Signed-off-by: Kamal Mostafa --- fs/nfsd/vfs.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 59f1e77..ae1011a 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -406,6 +406,7 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, umode_t ftype = 0; __be32 err; int host_err; + bool get_write_count; int size_change = 0; if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) @@ -413,10 +414,18 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, if (iap->ia_valid & ATTR_SIZE) ftype = S_IFREG; + /* Callers that do fh_verify should do the fh_want_write: */ + get_write_count = !fhp->fh_dentry; + /* Get inode */ err = fh_verify(rqstp, fhp, ftype, accmode); if (err) goto out; + if (get_write_count) { + host_err = fh_want_write(fhp); + if (host_err) + return nfserrno(host_err); + } dentry = fhp->fh_dentry; inode = dentry->d_inode; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/