fs: return EPERM on immutable inode

In most cases, EPERM is returned on immutable inode, and there're only a
few places returning EACCES. I noticed this when running LTP on
overlayfs, setxattr03 failed due to unexpected EACCES on immutable
inode.

So converting all EACCES to EPERM on immutable inode.

Acked-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 5 insertions, 4 deletions

diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index e0621cacf134..e4da0ecd3285 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -1800,7 +1800,7 @@ int gfs2_permission(struct inode *inode, int mask)
         }
 
         if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
-                error = -EACCES;
+                error = -EPERM;
         else
                 error = generic_permission(inode, mask);
         if (gfs2_holder_initialized(&i_gh))
diff --git a/fs/namei.c b/fs/namei.c
index c386a329ab20..adb04146df09 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -410,7 +410,7 @@ int __inode_permission(struct inode *inode, int mask)
                  * Nobody gets write access to an immutable file.
                  */
                 if (IS_IMMUTABLE(inode))
-                        return -EACCES;
+                        return -EPERM;
 
                 /*
                  * Updating mtime will likely cause i_uid and i_gid to be
diff --git a/fs/utimes.c b/fs/utimes.c
index 85c40f4f373d..794f5f5b1fb5 100644
--- a/fs/utimes.c
+++ b/fs/utimes.c
@@ -92,10 +92,11 @@ static int utimes_common(struct path *path, struct timespec *times)
                  * then we need to check permissions, because
                  * inode_change_ok() won't do it.
                  */
-                error = -EACCES;
+                error = -EPERM;
                 if (IS_IMMUTABLE(inode))
                         goto mnt_drop_write_and_out;
 
+                error = -EACCES;
                 if (!inode_owner_or_capable(inode)) {
                         error = inode_permission(inode, MAY_WRITE);
                         if (error)
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index cf46658392ce..96a70fd1f5d6 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -232,7 +232,7 @@ xfs_open_by_handle(
         }
 
         if ((fmode & FMODE_WRITE) && IS_IMMUTABLE(inode)) {
-                error = -EACCES;
+                error = -EPERM;
                 goto out_dput;
         }