fs: make posix_acl_create more useful

Rename the current posix_acl_created to __posix_acl_create and add
a fully featured helper to set up the ACLs on file creation that
uses get_acl().

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

17 files changed, 81 insertions, 23 deletions

diff --git a/fs/9p/acl.c b/fs/9p/acl.c
index f5ce5c50c57e..8482f2d11606 100644
--- a/fs/9p/acl.c
+++ b/fs/9p/acl.c
@@ -200,7 +200,7 @@ int v9fs_acl_mode(struct inode *dir, umode_t *modep,
         if (acl) {
                 if (S_ISDIR(mode))
                         *dpacl = posix_acl_dup(acl);
-                retval = posix_acl_create(&acl, GFP_NOFS, &mode);
+                retval = __posix_acl_create(&acl, GFP_NOFS, &mode);
                 if (retval < 0)
                         return retval;
                 if (retval > 0)
diff --git a/fs/btrfs/acl.c b/fs/btrfs/acl.c
index 1af04ff88986..b56519d47268 100644
--- a/fs/btrfs/acl.c
+++ b/fs/btrfs/acl.c
@@ -222,7 +222,7 @@ int btrfs_init_acl(struct btrfs_trans_handle *trans,
                         if (ret)
                                 goto failed;
                 }
-                ret = posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
+                ret = __posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
                 if (ret < 0)
                         return ret;
 
diff --git a/fs/ext2/acl.c b/fs/ext2/acl.c
index 7006ced45324..6e842a764ee7 100644
--- a/fs/ext2/acl.c
+++ b/fs/ext2/acl.c
@@ -268,7 +268,7 @@ ext2_init_acl(struct inode *inode, struct inode *dir)
                         if (error)
                                 goto cleanup;
                 }
-                error = posix_acl_create(&acl, GFP_KERNEL, &inode->i_mode);
+                error = __posix_acl_create(&acl, GFP_KERNEL, &inode->i_mode);
                 if (error < 0)
                         return error;
                 if (error > 0) {
diff --git a/fs/ext3/acl.c b/fs/ext3/acl.c
index 6691a6c6b211..4f3d8fa0c0a3 100644
--- a/fs/ext3/acl.c
+++ b/fs/ext3/acl.c
@@ -271,7 +271,7 @@ ext3_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
                         if (error)
                                 goto cleanup;
                 }
-                error = posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
+                error = __posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
                 if (error < 0)
                         return error;
 
diff --git a/fs/ext4/acl.c b/fs/ext4/acl.c
index 2eebe02fdf09..f827f3bb6d41 100644
--- a/fs/ext4/acl.c
+++ b/fs/ext4/acl.c
@@ -276,7 +276,7 @@ ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
                         if (error)
                                 goto cleanup;
                 }
-                error = posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
+                error = __posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
                 if (error < 0)
                         return error;
 
diff --git a/fs/f2fs/acl.c b/fs/f2fs/acl.c
index 14c4df0ede34..45e84303c247 100644
--- a/fs/f2fs/acl.c
+++ b/fs/f2fs/acl.c
@@ -285,7 +285,7 @@ int f2fs_init_acl(struct inode *inode, struct inode *dir, struct page *ipage)
                 if (error)
                         goto cleanup;
         }
-        error = posix_acl_create(&acl, GFP_KERNEL, &inode->i_mode);
+        error = __posix_acl_create(&acl, GFP_KERNEL, &inode->i_mode);
         if (error < 0)
                 return error;
         if (error > 0)
diff --git a/fs/generic_acl.c b/fs/generic_acl.c
index 46a5076e9776..4357f39c8441 100644
--- a/fs/generic_acl.c
+++ b/fs/generic_acl.c
@@ -128,7 +128,7 @@ generic_acl_init(struct inode *inode, struct inode *dir)
         if (acl) {
                 if (S_ISDIR(inode->i_mode))
                         set_cached_acl(inode, ACL_TYPE_DEFAULT, acl);
-                error = posix_acl_create(&acl, GFP_KERNEL, &inode->i_mode);
+                error = __posix_acl_create(&acl, GFP_KERNEL, &inode->i_mode);
                 if (error < 0)
                         return error;
                 if (error > 0)
diff --git a/fs/gfs2/acl.c b/fs/gfs2/acl.c
index 3e200c7ca7ad..e82e4ac574a6 100644
--- a/fs/gfs2/acl.c
+++ b/fs/gfs2/acl.c
@@ -131,7 +131,7 @@ int gfs2_acl_create(struct gfs2_inode *dip, struct inode *inode)
                         goto out;
         }
 
-        error = posix_acl_create(&acl, GFP_NOFS, &mode);
+        error = __posix_acl_create(&acl, GFP_NOFS, &mode);
         if (error < 0)
                 return error;
 
diff --git a/fs/hfsplus/posix_acl.c b/fs/hfsplus/posix_acl.c
index cab5fd6fdb72..277942f36f80 100644
--- a/fs/hfsplus/posix_acl.c
+++ b/fs/hfsplus/posix_acl.c
@@ -137,7 +137,7 @@ int hfsplus_init_posix_acl(struct inode *inode, struct inode *dir)
                                 goto init_acl_cleanup;
                 }
 
-                err = posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
+                err = __posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
                 if (unlikely(err < 0))
                         return err;
 
diff --git a/fs/jffs2/acl.c b/fs/jffs2/acl.c
index 5853969a51bc..4d6e31b19816 100644
--- a/fs/jffs2/acl.c
+++ b/fs/jffs2/acl.c
@@ -295,7 +295,7 @@ int jffs2_init_acl_pre(struct inode *dir_i, struct inode *inode, umode_t *i_mode
                 if (S_ISDIR(*i_mode))
                         set_cached_acl(inode, ACL_TYPE_DEFAULT, acl);
 
-                rc = posix_acl_create(&acl, GFP_KERNEL, i_mode);
+                rc = __posix_acl_create(&acl, GFP_KERNEL, i_mode);
                 if (rc < 0)
                         return rc;
                 if (rc > 0)
diff --git a/fs/jfs/acl.c b/fs/jfs/acl.c
index 9c0fca8073da..28d529ae9a4a 100644
--- a/fs/jfs/acl.c
+++ b/fs/jfs/acl.c
@@ -132,7 +132,7 @@ int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir)
                         if (rc)
                                 goto cleanup;
                 }
-                rc = posix_acl_create(&acl, GFP_KERNEL, &inode->i_mode);
+                rc = __posix_acl_create(&acl, GFP_KERNEL, &inode->i_mode);
                 if (rc < 0)
                         goto cleanup; /* posix_acl_release(NULL) is no-op */
                 if (rc > 0)
diff --git a/fs/nfs/nfs3acl.c b/fs/nfs/nfs3acl.c
index 4a1aafba6a20..e85967587d74 100644
--- a/fs/nfs/nfs3acl.c
+++ b/fs/nfs/nfs3acl.c
@@ -428,7 +428,7 @@ int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
         if (!dfacl)
                 return 0;
         acl = posix_acl_dup(dfacl);
-        error = posix_acl_create(&acl, GFP_KERNEL, &mode);
+        error = __posix_acl_create(&acl, GFP_KERNEL, &mode);
         if (error < 0)
                 goto out_release_dfacl;
         error = nfs3_proc_setacls(inode, acl, S_ISDIR(inode->i_mode) ?
diff --git a/fs/ocfs2/acl.c b/fs/ocfs2/acl.c
index 73ccf0e22ec5..c0f9d2fe134f 100644
--- a/fs/ocfs2/acl.c
+++ b/fs/ocfs2/acl.c
@@ -401,7 +401,7 @@ int ocfs2_init_acl(handle_t *handle,
                                 goto cleanup;
                 }
                 mode = inode->i_mode;
-                ret = posix_acl_create(&acl, GFP_NOFS, &mode);
+                ret = __posix_acl_create(&acl, GFP_NOFS, &mode);
                 if (ret < 0)
                         return ret;
 
diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 08218550b0db..8f245ab20143 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -410,7 +410,7 @@ static int __posix_acl_chmod_masq(struct posix_acl *acl, umode_t mode)
 }
 
 int
-posix_acl_create(struct posix_acl **acl, gfp_t gfp, umode_t *mode_p)
+__posix_acl_create(struct posix_acl **acl, gfp_t gfp, umode_t *mode_p)
 {
         struct posix_acl *clone = posix_acl_clone(*acl, gfp);
         int err = -ENOMEM;
@@ -425,7 +425,7 @@ posix_acl_create(struct posix_acl **acl, gfp_t gfp, umode_t *mode_p)
         *acl = clone;
         return err;
 }
-EXPORT_SYMBOL(posix_acl_create);
+EXPORT_SYMBOL(__posix_acl_create);
 
 int
 __posix_acl_chmod(struct posix_acl **acl, gfp_t gfp, umode_t mode)
@@ -446,7 +446,7 @@ __posix_acl_chmod(struct posix_acl **acl, gfp_t gfp, umode_t mode)
 EXPORT_SYMBOL(__posix_acl_chmod);
 
 int
-posix_acl_chmod(struct inode *inode)
+posix_acl_chmod(struct inode *inode, umode_t mode)
 {
         struct posix_acl *acl;
         int ret = 0;
@@ -460,7 +460,7 @@ posix_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, mode);
         if (ret)
                 return ret;
         ret = inode->i_op->set_acl(inode, acl, ACL_TYPE_ACCESS);
@@ -469,6 +469,55 @@ posix_acl_chmod(struct inode *inode)
 }
 EXPORT_SYMBOL(posix_acl_chmod);
 
+int
+posix_acl_create(struct inode *dir, umode_t *mode,
+                struct posix_acl **default_acl, struct posix_acl **acl)
+{
+        struct posix_acl *p;
+        int ret;
+
+        if (S_ISLNK(*mode) || !IS_POSIXACL(dir))
+                goto no_acl;
+
+        p = get_acl(dir, ACL_TYPE_DEFAULT);
+        if (IS_ERR(p))
+                return PTR_ERR(p);
+
+        if (!p) {
+                *mode &= ~current_umask();
+                goto no_acl;
+        }
+
+        *acl = posix_acl_clone(p, GFP_NOFS);
+        if (!*acl)
+                return -ENOMEM;
+
+        ret = posix_acl_create_masq(*acl, mode);
+        if (ret < 0) {
+                posix_acl_release(*acl);
+                return -ENOMEM;
+        }
+
+        if (ret == 0) {
+                posix_acl_release(*acl);
+                *acl = NULL;
+        }
+
+        if (!S_ISDIR(*mode)) {
+                posix_acl_release(p);
+                *default_acl = NULL;
+        } else {
+                *default_acl = p;
+        }
+        return 0;
+
+no_acl:
+        *default_acl = NULL;
+        *acl = NULL;
+        return 0;
+}
+EXPORT_SYMBOL_GPL(posix_acl_create);
+
 /*
  * Fix up the uids and gids in posix acl extended attributes in place.
  */
diff --git a/fs/reiserfs/xattr_acl.c b/fs/reiserfs/xattr_acl.c
index ea4e44351f76..d95c9592327b 100644
--- a/fs/reiserfs/xattr_acl.c
+++ b/fs/reiserfs/xattr_acl.c
@@ -378,7 +378,7 @@ reiserfs_inherit_default_acl(struct reiserfs_transaction_handle *th,
 
                 /* Now we reconcile the new ACL and the mode,
                    potentially modifying both */
-                err = posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
+                err = __posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
                 if (err < 0)
                         return err;
 
diff --git a/fs/xfs/xfs_acl.c b/fs/xfs/xfs_acl.c
index 4eac1058b680..057ae2d502dc 100644
--- a/fs/xfs/xfs_acl.c
+++ b/fs/xfs/xfs_acl.c
@@ -297,12 +297,12 @@ xfs_inherit_acl(struct inode *inode, struct posix_acl *acl)
                         goto out;
         }
 
-        error = posix_acl_create(&acl, GFP_KERNEL, &mode);
+        error = __posix_acl_create(&acl, GFP_KERNEL, &mode);
         if (error < 0)
                 return error;
 
         /*
-         * If posix_acl_create returns a positive value we need to
+         * If __posix_acl_create returns a positive value we need to
          * inherit a permission that can't be represented using the Unix
          * mode bits and we actually need to set an ACL.
          */
diff --git a/include/linux/posix_acl.h b/include/linux/posix_acl.h
index 8b64e7899989..f7e6f6cb214a 100644
--- a/include/linux/posix_acl.h
+++ b/include/linux/posix_acl.h
@@ -88,14 +88,16 @@ extern int posix_acl_valid(const struct posix_acl *);
 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_create(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 *);
+extern int posix_acl_chmod(struct inode *, umode_t);
+extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **,
+                struct posix_acl **);
 
 static inline struct posix_acl **acl_by_type(struct inode *inode, int type)
 {
@@ -174,7 +176,7 @@ static inline void cache_no_acl(struct inode *inode)
         inode->i_default_acl = NULL;
 }
 #else
-static inline int posix_acl_chmod(struct inode *inode)
+static inline int posix_acl_chmod(struct inode *inode, umode_t mode)
 {
         return 0;
 }
@@ -182,6 +184,13 @@ static inline int posix_acl_chmod(struct inode *inode)
 static inline void cache_no_acl(struct inode *inode)
 {
 }
+
+static inline int posix_acl_create(struct inode *inode, umode_t *mode,
+                struct posix_acl **default_acl, struct posix_acl **acl)
+{
+        *default_acl = *acl = NULL;
+        return 0;
+}
 #endif /* CONFIG_FS_POSIX_ACL */
 
 struct posix_acl *get_acl(struct inode *inode, int type);