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authorAmir Goldstein <amir73il@gmail.com>2016-11-16 11:22:39 +0200
committerMiklos Szeredi <mszeredi@redhat.com>2016-12-16 11:02:56 +0100
commit48fab5d7c750ff70aa77c36a44c01211020bbc98 (patch)
tree50e8ac4df65410b5ae9ea9d4e083e7ddf3ebff37 /fs/overlayfs
parent6b2d5fe46fa8f4fc1c5262c73930b9a2a94db2e3 (diff)
ovl: fix nested overlayfs mount
When the upper overlayfs checks "trusted.overlay.*" xattr on the underlying overlayfs mount, it gets -EPERM, which confuses the upper overlayfs. Fix this by returning -EOPNOTSUPP instead of -EPERM from ovl_own_xattr_get() and ovl_own_xattr_set(). This behavior is consistent with the behavior of ovl_listxattr(), which filters out the private overlayfs xattrs. Note: nested overlays are deprecated. But this change makes sense regardless: these xattrs are private to the overlay and should always be hidden. Hence getting and setting them should indicate this. [SzMi: Use EOPNOTSUPP instead of ENODATA and use it for both getting and setting "trusted.overlay." xattrs. This is a perfectly valid error code for "we don't support this prefix", which is the case here.] Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs')
-rw-r--r--fs/overlayfs/super.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index e19e2ed6a4fd..aadb25413e6e 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -603,7 +603,7 @@ static int ovl_own_xattr_get(const struct xattr_handler *handler,
struct dentry *dentry, struct inode *inode,
const char *name, void *buffer, size_t size)
{
- return -EPERM;
+ return -EOPNOTSUPP;
}
static int ovl_own_xattr_set(const struct xattr_handler *handler,
@@ -611,7 +611,7 @@ static int ovl_own_xattr_set(const struct xattr_handler *handler,
const char *name, const void *value,
size_t size, int flags)
{
- return -EPERM;
+ return -EOPNOTSUPP;
}
static int ovl_other_xattr_get(const struct xattr_handler *handler,