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[PATCH 05/18] fs: make posix_acl_chmod more useful

To: viro@xxxxxxxxxxxxxxxxxx
Subject: [PATCH 05/18] fs: make posix_acl_chmod more useful
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Wed, 11 Dec 2013 02:42:48 -0800
Cc: linux-fsdevel@xxxxxxxxxxxxxxx, linux-btrfs@xxxxxxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, linux-f2fs-devel@xxxxxxxxxxxxxxxxxxxxx, linux-mtd@xxxxxxxxxxxxxxxxxxx, Mark Fasheh <mfasheh@xxxxxxxx>, Joel Becker <jlbec@xxxxxxxxxxxx>, reiserfs-devel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, jfs-discussion@xxxxxxxxxxxxxxxxxxxxx, cluster-devel@xxxxxxxxxx, linux-nfs@xxxxxxxxxxxxxxx, Andreas Gruenbacher <andreas.gruenbacher@xxxxxxxxxx>, Jan Kara <jack@xxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
References: <20131211104243.148113893@xxxxxxxxxxxxxxxxxxxxxx>
User-agent: quilt/0.60-1
Rename the current posix_acl_chmod to __posix_acl_chmod and add
a fully featured ACL chmod helper that uses the ->set_acl inode
operation.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
---
 fs/9p/acl.c               |    2 +-
 fs/btrfs/acl.c            |    2 +-
 fs/ext2/acl.c             |    2 +-
 fs/ext3/acl.c             |    2 +-
 fs/ext4/acl.c             |    2 +-
 fs/f2fs/acl.c             |    2 +-
 fs/generic_acl.c          |    2 +-
 fs/gfs2/acl.c             |    2 +-
 fs/hfsplus/posix_acl.c    |    2 +-
 fs/jffs2/acl.c            |    2 +-
 fs/jfs/acl.c              |    2 +-
 fs/ocfs2/acl.c            |    2 +-
 fs/posix_acl.c            |   30 +++++++++++++++++++++++++++---
 fs/reiserfs/xattr_acl.c   |    2 +-
 fs/xfs/xfs_acl.c          |    2 +-
 include/linux/posix_acl.h |   17 +++++++++++++----
 16 files changed, 54 insertions(+), 21 deletions(-)

diff --git a/fs/9p/acl.c b/fs/9p/acl.c
index 7af425f..f5ce5c5 100644
--- a/fs/9p/acl.c
+++ b/fs/9p/acl.c
@@ -156,7 +156,7 @@ int v9fs_acl_chmod(struct inode *inode, struct p9_fid *fid)
                return -EOPNOTSUPP;
        acl = v9fs_get_cached_acl(inode, ACL_TYPE_ACCESS);
        if (acl) {
-               retval = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
+               retval = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
                if (retval)
                        return retval;
                set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
diff --git a/fs/btrfs/acl.c b/fs/btrfs/acl.c
index 0890c83..1af04ff 100644
--- a/fs/btrfs/acl.c
+++ b/fs/btrfs/acl.c
@@ -256,7 +256,7 @@ int btrfs_acl_chmod(struct inode *inode)
        if (IS_ERR_OR_NULL(acl))
                return PTR_ERR(acl);
 
-       ret = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
+       ret = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
        if (ret)
                return ret;
        ret = btrfs_set_acl(NULL, inode, acl, ACL_TYPE_ACCESS);
diff --git a/fs/ext2/acl.c b/fs/ext2/acl.c
index 110b6b3..7006ced 100644
--- a/fs/ext2/acl.c
+++ b/fs/ext2/acl.c
@@ -308,7 +308,7 @@ ext2_acl_chmod(struct inode *inode)
        acl = ext2_get_acl(inode, ACL_TYPE_ACCESS);
        if (IS_ERR(acl) || !acl)
                return PTR_ERR(acl);
-       error = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
+       error = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
        if (error)
                return error;
        error = ext2_set_acl(inode, ACL_TYPE_ACCESS, acl);
diff --git a/fs/ext3/acl.c b/fs/ext3/acl.c
index dbb5ad5..6691a6c 100644
--- a/fs/ext3/acl.c
+++ b/fs/ext3/acl.c
@@ -314,7 +314,7 @@ ext3_acl_chmod(struct inode *inode)
        acl = ext3_get_acl(inode, ACL_TYPE_ACCESS);
        if (IS_ERR(acl) || !acl)
                return PTR_ERR(acl);
-       error = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
+       error = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
        if (error)
                return error;
 retry:
diff --git a/fs/ext4/acl.c b/fs/ext4/acl.c
index 39a54a0..2eebe02 100644
--- a/fs/ext4/acl.c
+++ b/fs/ext4/acl.c
@@ -320,7 +320,7 @@ ext4_acl_chmod(struct inode *inode)
        acl = ext4_get_acl(inode, ACL_TYPE_ACCESS);
        if (IS_ERR(acl) || !acl)
                return PTR_ERR(acl);
-       error = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
+       error = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
        if (error)
                return error;
 retry:
diff --git a/fs/f2fs/acl.c b/fs/f2fs/acl.c
index d0fc287..14c4df0 100644
--- a/fs/f2fs/acl.c
+++ b/fs/f2fs/acl.c
@@ -311,7 +311,7 @@ int f2fs_acl_chmod(struct inode *inode)
        if (IS_ERR(acl) || !acl)
                return PTR_ERR(acl);
 
-       error = posix_acl_chmod(&acl, GFP_KERNEL, mode);
+       error = __posix_acl_chmod(&acl, GFP_KERNEL, mode);
        if (error)
                return error;
 
diff --git a/fs/generic_acl.c b/fs/generic_acl.c
index b3f3676..46a5076 100644
--- a/fs/generic_acl.c
+++ b/fs/generic_acl.c
@@ -158,7 +158,7 @@ generic_acl_chmod(struct inode *inode)
                return -EOPNOTSUPP;
        acl = get_cached_acl(inode, ACL_TYPE_ACCESS);
        if (acl) {
-               error = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
+               error = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
                if (error)
                        return error;
                set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
diff --git a/fs/gfs2/acl.c b/fs/gfs2/acl.c
index f69ac0a..3e200c7 100644
--- a/fs/gfs2/acl.c
+++ b/fs/gfs2/acl.c
@@ -162,7 +162,7 @@ int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr 
*attr)
        if (!acl)
                return gfs2_setattr_simple(inode, attr);
 
-       error = posix_acl_chmod(&acl, GFP_NOFS, attr->ia_mode);
+       error = __posix_acl_chmod(&acl, GFP_NOFS, attr->ia_mode);
        if (error)
                return error;
 
diff --git a/fs/hfsplus/posix_acl.c b/fs/hfsplus/posix_acl.c
index b609cc1..cab5fd6 100644
--- a/fs/hfsplus/posix_acl.c
+++ b/fs/hfsplus/posix_acl.c
@@ -167,7 +167,7 @@ int hfsplus_posix_acl_chmod(struct inode *inode)
        if (IS_ERR(acl) || !acl)
                return PTR_ERR(acl);
 
-       err = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
+       err = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
        if (unlikely(err))
                return err;
 
diff --git a/fs/jffs2/acl.c b/fs/jffs2/acl.c
index 223283c..5853969 100644
--- a/fs/jffs2/acl.c
+++ b/fs/jffs2/acl.c
@@ -335,7 +335,7 @@ int jffs2_acl_chmod(struct inode *inode)
        acl = jffs2_get_acl(inode, ACL_TYPE_ACCESS);
        if (IS_ERR(acl) || !acl)
                return PTR_ERR(acl);
-       rc = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
+       rc = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
        if (rc)
                return rc;
        rc = jffs2_set_acl(inode, ACL_TYPE_ACCESS, acl);
diff --git a/fs/jfs/acl.c b/fs/jfs/acl.c
index d254d6d..9c0fca8 100644
--- a/fs/jfs/acl.c
+++ b/fs/jfs/acl.c
@@ -161,7 +161,7 @@ int jfs_acl_chmod(struct inode *inode)
        if (IS_ERR(acl) || !acl)
                return PTR_ERR(acl);
 
-       rc = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
+       rc = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
        if (rc)
                return rc;
 
diff --git a/fs/ocfs2/acl.c b/fs/ocfs2/acl.c
index b4f788e..73ccf0e 100644
--- a/fs/ocfs2/acl.c
+++ b/fs/ocfs2/acl.c
@@ -350,7 +350,7 @@ int ocfs2_acl_chmod(struct inode *inode)
        acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS);
        if (IS_ERR(acl) || !acl)
                return PTR_ERR(acl);
-       ret = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
+       ret = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
        if (ret)
                return ret;
        ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS,
diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index f2c48f8..bc5b4f8 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -338,7 +338,7 @@ static int posix_acl_create_masq(struct posix_acl *acl, 
umode_t *mode_p)
 /*
  * Modify the ACL for the chmod syscall.
  */
-static int posix_acl_chmod_masq(struct posix_acl *acl, umode_t mode)
+static int __posix_acl_chmod_masq(struct posix_acl *acl, umode_t mode)
 {
        struct posix_acl_entry *group_obj = NULL, *mask_obj = NULL;
        struct posix_acl_entry *pa, *pe;
@@ -402,12 +402,12 @@ posix_acl_create(struct posix_acl **acl, gfp_t gfp, 
umode_t *mode_p)
 EXPORT_SYMBOL(posix_acl_create);
 
 int
-posix_acl_chmod(struct posix_acl **acl, gfp_t gfp, umode_t mode)
+__posix_acl_chmod(struct posix_acl **acl, gfp_t gfp, umode_t mode)
 {
        struct posix_acl *clone = posix_acl_clone(*acl, gfp);
        int err = -ENOMEM;
        if (clone) {
-               err = posix_acl_chmod_masq(clone, mode);
+               err = __posix_acl_chmod_masq(clone, mode);
                if (err) {
                        posix_acl_release(clone);
                        clone = NULL;
@@ -417,6 +417,30 @@ posix_acl_chmod(struct posix_acl **acl, gfp_t gfp, umode_t 
mode)
        *acl = clone;
        return err;
 }
+EXPORT_SYMBOL(__posix_acl_chmod);
+
+int
+posix_acl_chmod(struct inode *inode)
+{
+       struct posix_acl *acl;
+       int ret = 0;
+
+       if (S_ISLNK(inode->i_mode) || !inode->i_op->set_acl)
+               return -EOPNOTSUPP;
+       if (!IS_POSIXACL(inode))
+               return 0;
+
+       acl = get_acl(inode, ACL_TYPE_ACCESS);
+       if (IS_ERR_OR_NULL(acl))
+               return PTR_ERR(acl);
+
+       ret = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
+       if (ret)
+               return ret;
+       ret = inode->i_op->set_acl(inode, acl, ACL_TYPE_ACCESS);
+       posix_acl_release(acl);
+       return ret;
+}
 EXPORT_SYMBOL(posix_acl_chmod);
 
 struct posix_acl *get_acl(struct inode *inode, int type)
diff --git a/fs/reiserfs/xattr_acl.c b/fs/reiserfs/xattr_acl.c
index 6f721ea..ea4e443 100644
--- a/fs/reiserfs/xattr_acl.c
+++ b/fs/reiserfs/xattr_acl.c
@@ -463,7 +463,7 @@ int reiserfs_acl_chmod(struct inode *inode)
                return 0;
        if (IS_ERR(acl))
                return PTR_ERR(acl);
-       error = posix_acl_chmod(&acl, GFP_NOFS, inode->i_mode);
+       error = __posix_acl_chmod(&acl, GFP_NOFS, inode->i_mode);
        if (error)
                return error;
 
diff --git a/fs/xfs/xfs_acl.c b/fs/xfs/xfs_acl.c
index 370eb3e..4eac105 100644
--- a/fs/xfs/xfs_acl.c
+++ b/fs/xfs/xfs_acl.c
@@ -334,7 +334,7 @@ xfs_acl_chmod(struct inode *inode)
        if (IS_ERR(acl) || !acl)
                return PTR_ERR(acl);
 
-       error = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
+       error = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
        if (error)
                return error;
 
diff --git a/include/linux/posix_acl.h b/include/linux/posix_acl.h
index a8d9918..8b64e78 100644
--- a/include/linux/posix_acl.h
+++ b/include/linux/posix_acl.h
@@ -89,12 +89,14 @@ extern int posix_acl_permission(struct inode *, const 
struct posix_acl *, int);
 extern struct posix_acl *posix_acl_from_mode(umode_t, gfp_t);
 extern int posix_acl_equiv_mode(const struct posix_acl *, umode_t *);
 extern int posix_acl_create(struct posix_acl **, gfp_t, umode_t *);
-extern int posix_acl_chmod(struct posix_acl **, gfp_t, umode_t);
+extern int __posix_acl_chmod(struct posix_acl **, gfp_t, umode_t);
 
 extern struct posix_acl *get_posix_acl(struct inode *, int);
 extern int set_posix_acl(struct inode *, int, struct posix_acl *);
 
 #ifdef CONFIG_FS_POSIX_ACL
+extern int posix_acl_chmod(struct inode *);
+
 static inline struct posix_acl **acl_by_type(struct inode *inode, int type)
 {
        switch (type) {
@@ -165,15 +167,22 @@ static inline void forget_all_cached_acls(struct inode 
*inode)
        if (old_default != ACL_NOT_CACHED)
                posix_acl_release(old_default);
 }
-#endif
 
 static inline void cache_no_acl(struct inode *inode)
 {
-#ifdef CONFIG_FS_POSIX_ACL
        inode->i_acl = NULL;
        inode->i_default_acl = NULL;
-#endif
 }
+#else
+static inline int posix_acl_chmod(struct inode *inode)
+{
+       return 0;
+}
+
+static inline void cache_no_acl(struct inode *inode)
+{
+}
+#endif /* CONFIG_FS_POSIX_ACL */
 
 struct posix_acl *get_acl(struct inode *inode, int type);
 
-- 
1.7.10.4


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