This mini-series enables RCU lookups for overlayfs.
Al, can you take this into your tree, or at least ack the vfs changes so I
can push this to the overlayfs tree?
Thanks,
Miklos
---
Miklos Szeredi (2):
vfs: add flags argument to ->get_acl() callback
ovl: enable RCU'd ->get_acl()
Documentation/filesystems/locking.rst | 2 +-
Documentation/filesystems/vfs.rst | 2 +-
fs/9p/acl.c | 5 ++++-
fs/9p/acl.h | 2 +-
fs/bad_inode.c | 2 +-
fs/btrfs/acl.c | 5 ++++-
fs/btrfs/ctree.h | 2 +-
fs/ceph/acl.c | 5 ++++-
fs/ceph/super.h | 2 +-
fs/erofs/xattr.c | 5 ++++-
fs/erofs/xattr.h | 2 +-
fs/ext2/acl.c | 5 ++++-
fs/ext2/acl.h | 2 +-
fs/ext4/acl.c | 5 ++++-
fs/ext4/acl.h | 2 +-
fs/f2fs/acl.c | 5 ++++-
fs/f2fs/acl.h | 2 +-
fs/fuse/acl.c | 5 ++++-
fs/fuse/fuse_i.h | 2 +-
fs/gfs2/acl.c | 5 ++++-
fs/gfs2/acl.h | 2 +-
fs/jffs2/acl.c | 5 ++++-
fs/jffs2/acl.h | 2 +-
fs/jfs/acl.c | 5 ++++-
fs/jfs/jfs_acl.h | 2 +-
fs/nfs/nfs3_fs.h | 2 +-
fs/nfs/nfs3acl.c | 5 ++++-
fs/ocfs2/acl.c | 5 ++++-
fs/ocfs2/acl.h | 2 +-
fs/orangefs/acl.c | 5 ++++-
fs/orangefs/orangefs-kernel.h | 2 +-
fs/overlayfs/inode.c | 6 +++++-
fs/overlayfs/overlayfs.h | 2 +-
fs/posix_acl.c | 10 ++++++++--
fs/reiserfs/acl.h | 2 +-
fs/reiserfs/xattr_acl.c | 5 ++++-
fs/xfs/xfs_acl.c | 5 ++++-
fs/xfs/xfs_acl.h | 4 ++--
include/linux/fs.h | 7 ++++++-
39 files changed, 104 insertions(+), 41 deletions(-)
--
2.31.1
Overlayfs does not cache ACL's (to avoid double caching). Instead it just
calls the underlying filesystem's i_op->get_acl(), which will return the
cached value, if possible.
In rcu path walk, however, get_cached_acl_rcu() is employed to get the
value from the cache, which will fail on overlayfs resulting in dropping
out of rcu walk mode. This can result in a big performance hit in certain
situations.
Fix by calling ->get_acl() with LOOKUP_RCU flag in case of ACL_DONT_CACHE
(which indicates pass-through)
Reported-by: garyhuang <[email protected]>
Signed-off-by: Miklos Szeredi <[email protected]>
---
fs/overlayfs/inode.c | 7 ++++---
fs/posix_acl.c | 8 +++++++-
include/linux/fs.h | 5 +++++
3 files changed, 16 insertions(+), 4 deletions(-)
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index 727154a1d3ce..6a55231b262a 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -13,6 +13,7 @@
#include <linux/fiemap.h>
#include <linux/fileattr.h>
#include <linux/security.h>
+#include <linux/namei.h>
#include "overlayfs.h"
@@ -454,12 +455,12 @@ struct posix_acl *ovl_get_acl(struct inode *inode, int type, int flags)
const struct cred *old_cred;
struct posix_acl *acl;
- if (flags)
- return ERR_PTR(-EINVAL);
-
if (!IS_ENABLED(CONFIG_FS_POSIX_ACL) || !IS_POSIXACL(realinode))
return NULL;
+ if (flags & LOOKUP_RCU)
+ return get_cached_acl_rcu(realinode, type);
+
old_cred = ovl_override_creds(inode->i_sb);
acl = get_acl(realinode, type);
revert_creds(old_cred);
diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 6b7f793e2b6f..4d1c6c266cf0 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -22,6 +22,7 @@
#include <linux/xattr.h>
#include <linux/export.h>
#include <linux/user_namespace.h>
+#include <linux/namei.h>
static struct posix_acl **acl_by_type(struct inode *inode, int type)
{
@@ -56,7 +57,12 @@ EXPORT_SYMBOL(get_cached_acl);
struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type)
{
- return rcu_dereference(*acl_by_type(inode, type));
+ struct posix_acl *acl = rcu_dereference(*acl_by_type(inode, type));
+
+ if (acl == ACL_DONT_CACHE)
+ acl = inode->i_op->get_acl(inode, type, LOOKUP_RCU);
+
+ return acl;
}
EXPORT_SYMBOL(get_cached_acl_rcu);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 1c56d4fc4efe..20b7db2d0a85 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -581,6 +581,11 @@ static inline void mapping_allow_writable(struct address_space *mapping)
struct posix_acl;
#define ACL_NOT_CACHED ((void *)(-1))
+/*
+ * ACL_DONT_CACHE is for stacked filesystems, that rely on underlying fs to
+ * cache the ACL. This also means that ->get_acl() can be called in RCU mode
+ * with the LOOKUP_RCU flag.
+ */
#define ACL_DONT_CACHE ((void *)(-3))
static inline struct posix_acl *
--
2.31.1
Add a flags argument to the ->get_acl() callback, to allow
get_cached_acl_rcu() to call the ->get_acl() method with LOOKUP_RCU.
Signed-off-by: Miklos Szeredi <[email protected]>
---
Documentation/filesystems/locking.rst | 2 +-
Documentation/filesystems/vfs.rst | 2 +-
fs/9p/acl.c | 5 ++++-
fs/9p/acl.h | 2 +-
fs/bad_inode.c | 2 +-
fs/btrfs/acl.c | 5 ++++-
fs/btrfs/ctree.h | 2 +-
fs/ceph/acl.c | 5 ++++-
fs/ceph/super.h | 2 +-
fs/erofs/xattr.c | 5 ++++-
fs/erofs/xattr.h | 2 +-
fs/ext2/acl.c | 5 ++++-
fs/ext2/acl.h | 2 +-
fs/ext4/acl.c | 5 ++++-
fs/ext4/acl.h | 2 +-
fs/f2fs/acl.c | 5 ++++-
fs/f2fs/acl.h | 2 +-
fs/fuse/acl.c | 5 ++++-
fs/fuse/fuse_i.h | 2 +-
fs/gfs2/acl.c | 5 ++++-
fs/gfs2/acl.h | 2 +-
fs/jffs2/acl.c | 5 ++++-
fs/jffs2/acl.h | 2 +-
fs/jfs/acl.c | 5 ++++-
fs/jfs/jfs_acl.h | 2 +-
fs/nfs/nfs3_fs.h | 2 +-
fs/nfs/nfs3acl.c | 5 ++++-
fs/ocfs2/acl.c | 5 ++++-
fs/ocfs2/acl.h | 2 +-
fs/orangefs/acl.c | 5 ++++-
fs/orangefs/orangefs-kernel.h | 2 +-
fs/overlayfs/inode.c | 5 ++++-
fs/overlayfs/overlayfs.h | 2 +-
fs/posix_acl.c | 2 +-
fs/reiserfs/acl.h | 2 +-
fs/reiserfs/xattr_acl.c | 5 ++++-
fs/xfs/xfs_acl.c | 5 ++++-
fs/xfs/xfs_acl.h | 4 ++--
include/linux/fs.h | 2 +-
39 files changed, 91 insertions(+), 40 deletions(-)
diff --git a/Documentation/filesystems/locking.rst b/Documentation/filesystems/locking.rst
index 2183fd8cc350..a6a8f2b34331 100644
--- a/Documentation/filesystems/locking.rst
+++ b/Documentation/filesystems/locking.rst
@@ -70,7 +70,7 @@ prototypes::
const char *(*get_link) (struct dentry *, struct inode *, struct delayed_call *);
void (*truncate) (struct inode *);
int (*permission) (struct inode *, int, unsigned int);
- int (*get_acl)(struct inode *, int);
+ struct posix_acl * (*get_acl)(struct inode *, int, int);
int (*setattr) (struct dentry *, struct iattr *);
int (*getattr) (const struct path *, struct kstat *, u32, unsigned int);
ssize_t (*listxattr) (struct dentry *, char *, size_t);
diff --git a/Documentation/filesystems/vfs.rst b/Documentation/filesystems/vfs.rst
index 14c31eced416..dc9339acb66f 100644
--- a/Documentation/filesystems/vfs.rst
+++ b/Documentation/filesystems/vfs.rst
@@ -432,7 +432,7 @@ As of kernel 2.6.22, the following members are defined:
const char *(*get_link) (struct dentry *, struct inode *,
struct delayed_call *);
int (*permission) (struct user_namespace *, struct inode *, int);
- int (*get_acl)(struct inode *, int);
+ struct posix_acl * (*get_acl)(struct inode *, int, int);
int (*setattr) (struct user_namespace *, struct dentry *, struct iattr *);
int (*getattr) (struct user_namespace *, const struct path *, struct kstat *, u32, unsigned int);
ssize_t (*listxattr) (struct dentry *, char *, size_t);
diff --git a/fs/9p/acl.c b/fs/9p/acl.c
index bb1b286c49ae..3ef7db80fe29 100644
--- a/fs/9p/acl.c
+++ b/fs/9p/acl.c
@@ -97,10 +97,13 @@ static struct posix_acl *v9fs_get_cached_acl(struct inode *inode, int type)
return acl;
}
-struct posix_acl *v9fs_iop_get_acl(struct inode *inode, int type)
+struct posix_acl *v9fs_iop_get_acl(struct inode *inode, int type, int flags)
{
struct v9fs_session_info *v9ses;
+ if (flags)
+ return ERR_PTR(-EINVAL);
+
v9ses = v9fs_inode2v9ses(inode);
if (((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) ||
((v9ses->flags & V9FS_ACL_MASK) != V9FS_POSIX_ACL)) {
diff --git a/fs/9p/acl.h b/fs/9p/acl.h
index e4f7e882272b..7b31cef9ef5a 100644
--- a/fs/9p/acl.h
+++ b/fs/9p/acl.h
@@ -16,7 +16,7 @@
#ifdef CONFIG_9P_FS_POSIX_ACL
extern int v9fs_get_acl(struct inode *, struct p9_fid *);
-extern struct posix_acl *v9fs_iop_get_acl(struct inode *inode, int type);
+extern struct posix_acl *v9fs_iop_get_acl(struct inode *inode, int type, int flags);
extern int v9fs_acl_chmod(struct inode *, struct p9_fid *);
extern int v9fs_set_create_acl(struct inode *, struct p9_fid *,
struct posix_acl *, struct posix_acl *);
diff --git a/fs/bad_inode.c b/fs/bad_inode.c
index 48e16144c1f7..dd34decddaa6 100644
--- a/fs/bad_inode.c
+++ b/fs/bad_inode.c
@@ -121,7 +121,7 @@ static const char *bad_inode_get_link(struct dentry *dentry,
return ERR_PTR(-EIO);
}
-static struct posix_acl *bad_inode_get_acl(struct inode *inode, int type)
+static struct posix_acl *bad_inode_get_acl(struct inode *inode, int type, int flags)
{
return ERR_PTR(-EIO);
}
diff --git a/fs/btrfs/acl.c b/fs/btrfs/acl.c
index d95eb5c8cb37..b53d55186e4a 100644
--- a/fs/btrfs/acl.c
+++ b/fs/btrfs/acl.c
@@ -16,13 +16,16 @@
#include "btrfs_inode.h"
#include "xattr.h"
-struct posix_acl *btrfs_get_acl(struct inode *inode, int type)
+struct posix_acl *btrfs_get_acl(struct inode *inode, int type, int flags)
{
int size;
const char *name;
char *value = NULL;
struct posix_acl *acl;
+ if (flags)
+ return ERR_PTR(-EINVAL);
+
switch (type) {
case ACL_TYPE_ACCESS:
name = XATTR_NAME_POSIX_ACL_ACCESS;
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index e5e53e592d4f..460a64266066 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3686,7 +3686,7 @@ static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
/* acl.c */
#ifdef CONFIG_BTRFS_FS_POSIX_ACL
-struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
+struct posix_acl *btrfs_get_acl(struct inode *inode, int type, int flags);
int btrfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
struct posix_acl *acl, int type);
int btrfs_init_acl(struct btrfs_trans_handle *trans,
diff --git a/fs/ceph/acl.c b/fs/ceph/acl.c
index 529af59d9fd3..61e4f866d162 100644
--- a/fs/ceph/acl.c
+++ b/fs/ceph/acl.c
@@ -29,7 +29,7 @@ static inline void ceph_set_cached_acl(struct inode *inode,
spin_unlock(&ci->i_ceph_lock);
}
-struct posix_acl *ceph_get_acl(struct inode *inode, int type)
+struct posix_acl *ceph_get_acl(struct inode *inode, int type, int flags)
{
int size;
unsigned int retry_cnt = 0;
@@ -37,6 +37,9 @@ struct posix_acl *ceph_get_acl(struct inode *inode, int type)
char *value = NULL;
struct posix_acl *acl;
+ if (flags)
+ return ERR_PTR(-EINVAL);
+
switch (type) {
case ACL_TYPE_ACCESS:
name = XATTR_NAME_POSIX_ACL_ACCESS;
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 6b6332a5c113..528975f199eb 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -1087,7 +1087,7 @@ void ceph_release_acl_sec_ctx(struct ceph_acl_sec_ctx *as_ctx);
/* acl.c */
#ifdef CONFIG_CEPH_FS_POSIX_ACL
-struct posix_acl *ceph_get_acl(struct inode *, int);
+struct posix_acl *ceph_get_acl(struct inode *, int, int);
int ceph_set_acl(struct user_namespace *mnt_userns,
struct inode *inode, struct posix_acl *acl, int type);
int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
index 8dd54b420a1d..10c0d639d794 100644
--- a/fs/erofs/xattr.c
+++ b/fs/erofs/xattr.c
@@ -673,12 +673,15 @@ ssize_t erofs_listxattr(struct dentry *dentry,
}
#ifdef CONFIG_EROFS_FS_POSIX_ACL
-struct posix_acl *erofs_get_acl(struct inode *inode, int type)
+struct posix_acl *erofs_get_acl(struct inode *inode, int type, int flags)
{
struct posix_acl *acl;
int prefix, rc;
char *value = NULL;
+ if (flags)
+ return ERR_PTR(-EINVAL);
+
switch (type) {
case ACL_TYPE_ACCESS:
prefix = EROFS_XATTR_INDEX_POSIX_ACL_ACCESS;
diff --git a/fs/erofs/xattr.h b/fs/erofs/xattr.h
index 366dcb400525..ac35b5886eff 100644
--- a/fs/erofs/xattr.h
+++ b/fs/erofs/xattr.h
@@ -80,7 +80,7 @@ static inline int erofs_getxattr(struct inode *inode, int index,
#endif /* !CONFIG_EROFS_FS_XATTR */
#ifdef CONFIG_EROFS_FS_POSIX_ACL
-struct posix_acl *erofs_get_acl(struct inode *inode, int type);
+struct posix_acl *erofs_get_acl(struct inode *inode, int type, int flags);
#else
#define erofs_get_acl (NULL)
#endif
diff --git a/fs/ext2/acl.c b/fs/ext2/acl.c
index b9a9db98e94b..e203ebd224c4 100644
--- a/fs/ext2/acl.c
+++ b/fs/ext2/acl.c
@@ -141,13 +141,16 @@ ext2_acl_to_disk(const struct posix_acl *acl, size_t *size)
* inode->i_mutex: don't care
*/
struct posix_acl *
-ext2_get_acl(struct inode *inode, int type)
+ext2_get_acl(struct inode *inode, int type, int flags)
{
int name_index;
char *value = NULL;
struct posix_acl *acl;
int retval;
+ if (flags)
+ return ERR_PTR(-EINVAL);
+
switch (type) {
case ACL_TYPE_ACCESS:
name_index = EXT2_XATTR_INDEX_POSIX_ACL_ACCESS;
diff --git a/fs/ext2/acl.h b/fs/ext2/acl.h
index 917db5f6630a..0bd53a953831 100644
--- a/fs/ext2/acl.h
+++ b/fs/ext2/acl.h
@@ -55,7 +55,7 @@ static inline int ext2_acl_count(size_t size)
#ifdef CONFIG_EXT2_FS_POSIX_ACL
/* acl.c */
-extern struct posix_acl *ext2_get_acl(struct inode *inode, int type);
+extern struct posix_acl *ext2_get_acl(struct inode *inode, int type, int flags);
extern int ext2_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
struct posix_acl *acl, int type);
extern int ext2_init_acl (struct inode *, struct inode *);
diff --git a/fs/ext4/acl.c b/fs/ext4/acl.c
index c5eaffccecc3..e4e27e34a221 100644
--- a/fs/ext4/acl.c
+++ b/fs/ext4/acl.c
@@ -142,13 +142,16 @@ ext4_acl_to_disk(const struct posix_acl *acl, size_t *size)
* inode->i_mutex: don't care
*/
struct posix_acl *
-ext4_get_acl(struct inode *inode, int type)
+ext4_get_acl(struct inode *inode, int type, int flags)
{
int name_index;
char *value = NULL;
struct posix_acl *acl;
int retval;
+ if (flags)
+ return ERR_PTR(-EINVAL);
+
switch (type) {
case ACL_TYPE_ACCESS:
name_index = EXT4_XATTR_INDEX_POSIX_ACL_ACCESS;
diff --git a/fs/ext4/acl.h b/fs/ext4/acl.h
index 84b8942a57f2..b349365c7b33 100644
--- a/fs/ext4/acl.h
+++ b/fs/ext4/acl.h
@@ -55,7 +55,7 @@ static inline int ext4_acl_count(size_t size)
#ifdef CONFIG_EXT4_FS_POSIX_ACL
/* acl.c */
-struct posix_acl *ext4_get_acl(struct inode *inode, int type);
+struct posix_acl *ext4_get_acl(struct inode *inode, int type, int flags);
int ext4_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
struct posix_acl *acl, int type);
extern int ext4_init_acl(handle_t *, struct inode *, struct inode *);
diff --git a/fs/f2fs/acl.c b/fs/f2fs/acl.c
index 239ad9453b99..4d1b348a0ab7 100644
--- a/fs/f2fs/acl.c
+++ b/fs/f2fs/acl.c
@@ -196,8 +196,11 @@ static struct posix_acl *__f2fs_get_acl(struct inode *inode, int type,
return acl;
}
-struct posix_acl *f2fs_get_acl(struct inode *inode, int type)
+struct posix_acl *f2fs_get_acl(struct inode *inode, int type, int flags)
{
+ if (flags)
+ return ERR_PTR(-EINVAL);
+
return __f2fs_get_acl(inode, type, NULL);
}
diff --git a/fs/f2fs/acl.h b/fs/f2fs/acl.h
index 986fd1bc780b..3b7b0deb2845 100644
--- a/fs/f2fs/acl.h
+++ b/fs/f2fs/acl.h
@@ -33,7 +33,7 @@ struct f2fs_acl_header {
#ifdef CONFIG_F2FS_FS_POSIX_ACL
-extern struct posix_acl *f2fs_get_acl(struct inode *, int);
+extern struct posix_acl *f2fs_get_acl(struct inode *, int, int);
extern int f2fs_set_acl(struct user_namespace *, struct inode *,
struct posix_acl *, int);
extern int f2fs_init_acl(struct inode *, struct inode *, struct page *,
diff --git a/fs/fuse/acl.c b/fs/fuse/acl.c
index 52b165319be1..194cb81634f9 100644
--- a/fs/fuse/acl.c
+++ b/fs/fuse/acl.c
@@ -11,7 +11,7 @@
#include <linux/posix_acl.h>
#include <linux/posix_acl_xattr.h>
-struct posix_acl *fuse_get_acl(struct inode *inode, int type)
+struct posix_acl *fuse_get_acl(struct inode *inode, int type, int flags)
{
struct fuse_conn *fc = get_fuse_conn(inode);
int size;
@@ -19,6 +19,9 @@ struct posix_acl *fuse_get_acl(struct inode *inode, int type)
void *value = NULL;
struct posix_acl *acl;
+ if (flags)
+ return ERR_PTR(-EINVAL);
+
if (fuse_is_bad(inode))
return ERR_PTR(-EIO);
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 07829ce78695..ba3a419c6766 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -1216,7 +1216,7 @@ extern const struct xattr_handler *fuse_acl_xattr_handlers[];
extern const struct xattr_handler *fuse_no_acl_xattr_handlers[];
struct posix_acl;
-struct posix_acl *fuse_get_acl(struct inode *inode, int type);
+struct posix_acl *fuse_get_acl(struct inode *inode, int type, int flags);
int fuse_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
struct posix_acl *acl, int type);
diff --git a/fs/gfs2/acl.c b/fs/gfs2/acl.c
index 9165d70ead07..956132de223c 100644
--- a/fs/gfs2/acl.c
+++ b/fs/gfs2/acl.c
@@ -57,13 +57,16 @@ static struct posix_acl *__gfs2_get_acl(struct inode *inode, int type)
return acl;
}
-struct posix_acl *gfs2_get_acl(struct inode *inode, int type)
+struct posix_acl *gfs2_get_acl(struct inode *inode, int type, int flags)
{
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_holder gh;
bool need_unlock = false;
struct posix_acl *acl;
+ if (flags)
+ return ERR_PTR(-EINVAL);
+
if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
int ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
LM_FLAG_ANY, &gh);
diff --git a/fs/gfs2/acl.h b/fs/gfs2/acl.h
index eccc6a43326c..cdf8f12089de 100644
--- a/fs/gfs2/acl.h
+++ b/fs/gfs2/acl.h
@@ -11,7 +11,7 @@
#define GFS2_ACL_MAX_ENTRIES(sdp) ((300 << (sdp)->sd_sb.sb_bsize_shift) >> 12)
-extern struct posix_acl *gfs2_get_acl(struct inode *inode, int type);
+extern struct posix_acl *gfs2_get_acl(struct inode *inode, int type, int flags);
extern int __gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type);
extern int gfs2_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
struct posix_acl *acl, int type);
diff --git a/fs/jffs2/acl.c b/fs/jffs2/acl.c
index 55a79df70d24..35f4a0dcbd71 100644
--- a/fs/jffs2/acl.c
+++ b/fs/jffs2/acl.c
@@ -173,12 +173,15 @@ static void *jffs2_acl_to_medium(const struct posix_acl *acl, size_t *size)
return ERR_PTR(-EINVAL);
}
-struct posix_acl *jffs2_get_acl(struct inode *inode, int type)
+struct posix_acl *jffs2_get_acl(struct inode *inode, int type, int flags)
{
struct posix_acl *acl;
char *value = NULL;
int rc, xprefix;
+ if (flags)
+ return ERR_PTR(-EINVAL);
+
switch (type) {
case ACL_TYPE_ACCESS:
xprefix = JFFS2_XPREFIX_ACL_ACCESS;
diff --git a/fs/jffs2/acl.h b/fs/jffs2/acl.h
index 62c50da9d493..afd6f924aacb 100644
--- a/fs/jffs2/acl.h
+++ b/fs/jffs2/acl.h
@@ -27,7 +27,7 @@ struct jffs2_acl_header {
#ifdef CONFIG_JFFS2_FS_POSIX_ACL
-struct posix_acl *jffs2_get_acl(struct inode *inode, int type);
+struct posix_acl *jffs2_get_acl(struct inode *inode, int type, int flags);
int jffs2_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
struct posix_acl *acl, int type);
extern int jffs2_init_acl_pre(struct inode *, struct inode *, umode_t *);
diff --git a/fs/jfs/acl.c b/fs/jfs/acl.c
index 43c285c3d2a7..344d047bcb97 100644
--- a/fs/jfs/acl.c
+++ b/fs/jfs/acl.c
@@ -14,13 +14,16 @@
#include "jfs_xattr.h"
#include "jfs_acl.h"
-struct posix_acl *jfs_get_acl(struct inode *inode, int type)
+struct posix_acl *jfs_get_acl(struct inode *inode, int type, int flags)
{
struct posix_acl *acl;
char *ea_name;
int size;
char *value = NULL;
+ if (flags)
+ return ERR_PTR(-EINVAL);
+
switch(type) {
case ACL_TYPE_ACCESS:
ea_name = XATTR_NAME_POSIX_ACL_ACCESS;
diff --git a/fs/jfs/jfs_acl.h b/fs/jfs/jfs_acl.h
index 7ae389a7a366..e86997d1f123 100644
--- a/fs/jfs/jfs_acl.h
+++ b/fs/jfs/jfs_acl.h
@@ -7,7 +7,7 @@
#ifdef CONFIG_JFS_POSIX_ACL
-struct posix_acl *jfs_get_acl(struct inode *inode, int type);
+struct posix_acl *jfs_get_acl(struct inode *inode, int type, int flags);
int jfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
struct posix_acl *acl, int type);
int jfs_init_acl(tid_t, struct inode *, struct inode *);
diff --git a/fs/nfs/nfs3_fs.h b/fs/nfs/nfs3_fs.h
index c8a192802dda..0f3ba2f3b8da 100644
--- a/fs/nfs/nfs3_fs.h
+++ b/fs/nfs/nfs3_fs.h
@@ -11,7 +11,7 @@
* nfs3acl.c
*/
#ifdef CONFIG_NFS_V3_ACL
-extern struct posix_acl *nfs3_get_acl(struct inode *inode, int type);
+extern struct posix_acl *nfs3_get_acl(struct inode *inode, int type, int flags);
extern int nfs3_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
struct posix_acl *acl, int type);
extern int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
diff --git a/fs/nfs/nfs3acl.c b/fs/nfs/nfs3acl.c
index 9ec560aa4a50..f94def1342c6 100644
--- a/fs/nfs/nfs3acl.c
+++ b/fs/nfs/nfs3acl.c
@@ -44,7 +44,7 @@ static void nfs3_abort_get_acl(struct posix_acl **p)
cmpxchg(p, sentinel, ACL_NOT_CACHED);
}
-struct posix_acl *nfs3_get_acl(struct inode *inode, int type)
+struct posix_acl *nfs3_get_acl(struct inode *inode, int type, int flags)
{
struct nfs_server *server = NFS_SERVER(inode);
struct page *pages[NFSACL_MAXPAGES] = { };
@@ -62,6 +62,9 @@ struct posix_acl *nfs3_get_acl(struct inode *inode, int type)
};
int status, count;
+ if (flags)
+ return ERR_PTR(-EINVAL);
+
if (!nfs_server_capable(inode, NFS_CAP_ACLS))
return ERR_PTR(-EOPNOTSUPP);
diff --git a/fs/ocfs2/acl.c b/fs/ocfs2/acl.c
index 5c72a7e6d6c5..a4df6e30c017 100644
--- a/fs/ocfs2/acl.c
+++ b/fs/ocfs2/acl.c
@@ -289,7 +289,7 @@ int ocfs2_iop_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
return status;
}
-struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type)
+struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type, int flags)
{
struct ocfs2_super *osb;
struct buffer_head *di_bh = NULL;
@@ -297,6 +297,9 @@ struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type)
int had_lock;
struct ocfs2_lock_holder oh;
+ if (flags)
+ return ERR_PTR(-EINVAL);
+
osb = OCFS2_SB(inode->i_sb);
if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
return NULL;
diff --git a/fs/ocfs2/acl.h b/fs/ocfs2/acl.h
index f59d8d0a61fa..e005c93b9153 100644
--- a/fs/ocfs2/acl.h
+++ b/fs/ocfs2/acl.h
@@ -16,7 +16,7 @@ struct ocfs2_acl_entry {
__le32 e_id;
};
-struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type);
+struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type, int flags);
int ocfs2_iop_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
struct posix_acl *acl, int type);
extern int ocfs2_acl_chmod(struct inode *, struct buffer_head *);
diff --git a/fs/orangefs/acl.c b/fs/orangefs/acl.c
index 18852b9ed82b..d93841d478ed 100644
--- a/fs/orangefs/acl.c
+++ b/fs/orangefs/acl.c
@@ -10,12 +10,15 @@
#include "orangefs-bufmap.h"
#include <linux/posix_acl_xattr.h>
-struct posix_acl *orangefs_get_acl(struct inode *inode, int type)
+struct posix_acl *orangefs_get_acl(struct inode *inode, int type, int flags)
{
struct posix_acl *acl;
int ret;
char *key = NULL, *value = NULL;
+ if (flags)
+ return ERR_PTR(-EINVAL);
+
switch (type) {
case ACL_TYPE_ACCESS:
key = XATTR_NAME_POSIX_ACL_ACCESS;
diff --git a/fs/orangefs/orangefs-kernel.h b/fs/orangefs/orangefs-kernel.h
index 0e6b97682e41..370bd89c670f 100644
--- a/fs/orangefs/orangefs-kernel.h
+++ b/fs/orangefs/orangefs-kernel.h
@@ -106,7 +106,7 @@ enum orangefs_vfs_op_states {
extern int orangefs_init_acl(struct inode *inode, struct inode *dir);
extern const struct xattr_handler *orangefs_xattr_handlers[];
-extern struct posix_acl *orangefs_get_acl(struct inode *inode, int type);
+extern struct posix_acl *orangefs_get_acl(struct inode *inode, int type, int flags);
extern int orangefs_set_acl(struct user_namespace *mnt_userns,
struct inode *inode, struct posix_acl *acl,
int type);
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index 5e828a1c98a8..727154a1d3ce 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -448,12 +448,15 @@ ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size)
return res;
}
-struct posix_acl *ovl_get_acl(struct inode *inode, int type)
+struct posix_acl *ovl_get_acl(struct inode *inode, int type, int flags)
{
struct inode *realinode = ovl_inode_real(inode);
const struct cred *old_cred;
struct posix_acl *acl;
+ if (flags)
+ return ERR_PTR(-EINVAL);
+
if (!IS_ENABLED(CONFIG_FS_POSIX_ACL) || !IS_POSIXACL(realinode))
return NULL;
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index 6ec73db4bf9e..daf6b75b9a54 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -485,7 +485,7 @@ int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name,
int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name,
void *value, size_t size);
ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size);
-struct posix_acl *ovl_get_acl(struct inode *inode, int type);
+struct posix_acl *ovl_get_acl(struct inode *inode, int type, int flags);
int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags);
bool ovl_is_private_xattr(struct super_block *sb, const char *name);
diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index f3309a7edb49..6b7f793e2b6f 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -138,7 +138,7 @@ struct posix_acl *get_acl(struct inode *inode, int type)
set_cached_acl(inode, type, NULL);
return NULL;
}
- acl = inode->i_op->get_acl(inode, type);
+ acl = inode->i_op->get_acl(inode, type, 0);
if (IS_ERR(acl)) {
/*
diff --git a/fs/reiserfs/acl.h b/fs/reiserfs/acl.h
index fd58618da360..bf10841b892d 100644
--- a/fs/reiserfs/acl.h
+++ b/fs/reiserfs/acl.h
@@ -48,7 +48,7 @@ static inline int reiserfs_acl_count(size_t size)
}
#ifdef CONFIG_REISERFS_FS_POSIX_ACL
-struct posix_acl *reiserfs_get_acl(struct inode *inode, int type);
+struct posix_acl *reiserfs_get_acl(struct inode *inode, int type, int flags);
int reiserfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
struct posix_acl *acl, int type);
int reiserfs_acl_chmod(struct inode *inode);
diff --git a/fs/reiserfs/xattr_acl.c b/fs/reiserfs/xattr_acl.c
index a9547144a099..0fdb4f531098 100644
--- a/fs/reiserfs/xattr_acl.c
+++ b/fs/reiserfs/xattr_acl.c
@@ -190,13 +190,16 @@ static void *reiserfs_posix_acl_to_disk(const struct posix_acl *acl, size_t * si
* inode->i_mutex: down
* BKL held [before 2.5.x]
*/
-struct posix_acl *reiserfs_get_acl(struct inode *inode, int type)
+struct posix_acl *reiserfs_get_acl(struct inode *inode, int type, int flags)
{
char *name, *value;
struct posix_acl *acl;
int size;
int retval;
+ if (flags)
+ return ERR_PTR(-EINVAL);
+
switch (type) {
case ACL_TYPE_ACCESS:
name = XATTR_NAME_POSIX_ACL_ACCESS;
diff --git a/fs/xfs/xfs_acl.c b/fs/xfs/xfs_acl.c
index d02bef24b32b..5f9b541e029d 100644
--- a/fs/xfs/xfs_acl.c
+++ b/fs/xfs/xfs_acl.c
@@ -125,7 +125,7 @@ xfs_acl_to_disk(struct xfs_acl *aclp, const struct posix_acl *acl)
}
struct posix_acl *
-xfs_get_acl(struct inode *inode, int type)
+xfs_get_acl(struct inode *inode, int type, int flags)
{
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
@@ -137,6 +137,9 @@ xfs_get_acl(struct inode *inode, int type)
};
int error;
+ if (flags)
+ return ERR_PTR(-EINVAL);
+
trace_xfs_get_acl(ip);
switch (type) {
diff --git a/fs/xfs/xfs_acl.h b/fs/xfs/xfs_acl.h
index 7bdb3a4ed798..38f933f2e281 100644
--- a/fs/xfs/xfs_acl.h
+++ b/fs/xfs/xfs_acl.h
@@ -10,13 +10,13 @@ struct inode;
struct posix_acl;
#ifdef CONFIG_XFS_POSIX_ACL
-extern struct posix_acl *xfs_get_acl(struct inode *inode, int type);
+extern struct posix_acl *xfs_get_acl(struct inode *inode, int type, int flags);
extern int xfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
struct posix_acl *acl, int type);
extern int __xfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
void xfs_forget_acl(struct inode *inode, const char *name);
#else
-static inline struct posix_acl *xfs_get_acl(struct inode *inode, int type)
+static inline struct posix_acl *xfs_get_acl(struct inode *inode, int type, int flags)
{
return NULL;
}
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 640574294216..1c56d4fc4efe 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2065,7 +2065,7 @@ struct inode_operations {
struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int);
const char * (*get_link) (struct dentry *, struct inode *, struct delayed_call *);
int (*permission) (struct user_namespace *, struct inode *, int);
- struct posix_acl * (*get_acl)(struct inode *, int);
+ struct posix_acl * (*get_acl)(struct inode *, int, int);
int (*readlink) (struct dentry *, char __user *,int);
--
2.31.1
Hi Miklos,
I love your patch! Yet something to improve:
[auto build test ERROR on miklos-vfs/overlayfs-next]
[also build test ERROR on kdave/for-next ceph-client/for-linus xiang-erofs/dev-test ext4/dev f2fs/dev-test fuse/for-next gfs2/for-next linus/master v5.14-rc5 next-20210810]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/Miklos-Szeredi/allow-overlayfs-to-do-RCU-lookups/20210810-200939
base: https://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs.git overlayfs-next
config: hexagon-randconfig-r032-20210810 (attached as .config)
compiler: clang version 12.0.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/0day-ci/linux/commit/7303859328569bbf653d8350215cd37b79486626
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Miklos-Szeredi/allow-overlayfs-to-do-RCU-lookups/20210810-200939
git checkout 7303859328569bbf653d8350215cd37b79486626
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=hexagon
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <[email protected]>
All error/warnings (new ones prefixed by >>):
>> fs/overlayfs/inode.c:460:10: error: implicit declaration of function 'get_cached_acl_rcu' [-Werror,-Wimplicit-function-declaration]
return get_cached_acl_rcu(realinode, type);
^
>> fs/overlayfs/inode.c:460:10: warning: incompatible integer to pointer conversion returning 'int' from a function with result type 'struct posix_acl *' [-Wint-conversion]
return get_cached_acl_rcu(realinode, type);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning and 1 error generated.
vim +/get_cached_acl_rcu +460 fs/overlayfs/inode.c
449
450 struct posix_acl *ovl_get_acl(struct inode *inode, int type, int flags)
451 {
452 struct inode *realinode = ovl_inode_real(inode);
453 const struct cred *old_cred;
454 struct posix_acl *acl;
455
456 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL) || !IS_POSIXACL(realinode))
457 return NULL;
458
459 if (flags & LOOKUP_RCU)
> 460 return get_cached_acl_rcu(realinode, type);
461
462 old_cred = ovl_override_creds(inode->i_sb);
463 acl = get_acl(realinode, type);
464 revert_creds(old_cred);
465
466 return acl;
467 }
468
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/[email protected]