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Subject[ 20/49] NFSv4: dont check MAY_WRITE access bit in OPEN
3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Weston Andros Adamson <dros@netapp.com>

commit bbd3a8eee82a2a6f4aa1cce60ccb014f25e5c560 upstream.

Don't check MAY_WRITE as a newly created file may not have write mode bits,
but POSIX allows the creating process to write regardless.
This is ok because NFSv4 OPEN ops handle write permissions correctly -
the ACCESS in the OPEN compound is to differentiate READ v EXEC permissions.

Fixes a regression due to commit 6168f62c (NFSv4: Add ACCESS operation to
OPEN compound)

Signed-off-by: Weston Andros Adamson <dros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
fs/nfs/nfs4proc.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 1e0faf9..ccada68 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -1661,10 +1661,10 @@ static int nfs4_opendata_access(struct rpc_cred *cred,
return 0;

mask = 0;
+ /* don't check MAY_WRITE - a newly created file may not have
+ * write mode bits, but POSIX allows the creating process to write */
if (fmode & FMODE_READ)
mask |= MAY_READ;
- if (fmode & FMODE_WRITE)
- mask |= MAY_WRITE;
if (fmode & FMODE_EXEC)
mask |= MAY_EXEC;

@@ -1673,7 +1673,7 @@ static int nfs4_opendata_access(struct rpc_cred *cred,
nfs_access_set_mask(&cache, opendata->o_res.access_result);
nfs_access_add_cache(state->inode, &cache);

- if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0)
+ if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
return 0;

/* even though OPEN succeeded, access is denied. Close the file */



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