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authorJ. Bruce Fields <bfields@redhat.com>2010-07-29 15:16:59 -0400
committerJ. Bruce Fields <bfields@redhat.com>2010-07-29 16:37:12 -0400
commit02921914170e3b7fea1cd82dac9713685d2de5e2 (patch)
tree623710431d4416022594d1a2a473f3ca64bf7490 /fs
parent21fb4016bd592409bc8f95737e365ac82413b795 (diff)
downloadop-kernel-dev-02921914170e3b7fea1cd82dac9713685d2de5e2.zip
op-kernel-dev-02921914170e3b7fea1cd82dac9713685d2de5e2.tar.gz
nfsd4: fix openmode checking on IO using lock stateid
It is legal to perform a write using the lock stateid that was originally associated with a read lock, or with a file that was originally opened for read, but has since been upgraded. So, when checking the openmode, check the mode associated with the open stateid from which the lock was derived. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfsd/nfs4state.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index d9c8232..b996a4b 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2779,6 +2779,9 @@ __be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
{
__be32 status = nfserr_openmode;
+ /* For lock stateid's, we test the parent open, not the lock: */
+ if (stp->st_openstp)
+ stp = stp->st_openstp;
if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
goto out;
if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
@@ -3466,7 +3469,6 @@ alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struc
stp->st_stateid.si_fileid = fp->fi_id;
stp->st_stateid.si_generation = 0;
stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
- stp->st_access_bmap = open_stp->st_access_bmap;
stp->st_deny_bmap = open_stp->st_deny_bmap;
stp->st_openstp = open_stp;
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