We only need to check lock exclusive/shared types against open mode when
flock() is used on NFS, so move it into the flock-specific path instead of
checking it for all locks.
Signed-off-by: Benjamin Coddington <bcodding@xxxxxxxxxx>
---
fs/nfs/file.c | 16 ++++++++++++++++
fs/nfs/nfs4proc.c | 13 -------------
2 files changed, 16 insertions(+), 13 deletions(-)
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 93e2364..1e4804b 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -893,6 +893,22 @@ int nfs_flock(struct file *filp, int cmd, struct file_lock *fl)
/* We're simulating flock() locks using posix locks on the server */
if (fl->fl_type == F_UNLCK)
return do_unlk(filp, cmd, fl, is_local);
+
+ /*
+ * VFS doesn't require the open mode to match a flock() lock's type.
+ * NFS, however, may simulate flock() locking with posix locking which
+ * requires the open mode to match the lock type.
+ */
+ switch (fl->fl_type) {
+ case F_RDLCK:
+ if (!(filp->f_mode & FMODE_READ))
+ return -EBADF;
+ break;
+ case F_WRLCK:
+ if (!(filp->f_mode & FMODE_WRITE))
+ return -EBADF;
+ }
+
return do_setlk(filp, cmd, fl, is_local);
}
EXPORT_SYMBOL_GPL(nfs_flock);
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 2231d7d..05ea1e1 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -6125,19 +6125,6 @@ nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
if (state == NULL)
return -ENOLCK;
- /*
- * Don't rely on the VFS having checked the file open mode,
- * since it won't do this for flock() locks.
- */
- switch (request->fl_type) {
- case F_RDLCK:
- if (!(filp->f_mode & FMODE_READ))
- return -EBADF;
- break;
- case F_WRLCK:
- if (!(filp->f_mode & FMODE_WRITE))
- return -EBADF;
- }
do {
status = nfs4_proc_setlk(state, cmd, request);
--
1.7.1
--
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