[JFFS2] Tidy up fix for ACL/permissions problem.

[In commit 9ed437c50d89eabae763dd422579f73fdebf288d we fixed a problem 
with standard permissions on newly-created inodes, when POSIX ACLs are 
enabled. This cleans it up...]

The attached patch separate jffs2_init_acl() into two parts.

The one is jffs2_init_acl_pre() called from jffs2_new_inode().
It compute ACL oriented inode->i_mode bits, and allocate in-memory ACL
objects associated with the new inode just before when inode meta
infomation is written to the medium.

The other is jffs2_init_acl_post() called from jffs2_symlink(),
jffs2_mkdir(), jffs2_mknod() and jffs2_do_create().
It actually writes in-memory ACL objects into the medium next to
the success of writing meta-information.

In the current implementation, we have to write a same inode meta
infomation twice when inode->i_mode is updated by the default ACL.
However, we can avoid the behavior by putting an updated i_mode
before it is written at first, as jffs2_init_acl_pre() doing.

Signed-off-by: KaiGai Kohei <kaigai@ak.jp.nec.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

6 files changed, 94 insertions, 87 deletions

diff --git a/fs/jffs2/acl.c b/fs/jffs2/acl.c
index 8ec9323e830a..9728614b8958 100644
--- a/fs/jffs2/acl.c
+++ b/fs/jffs2/acl.c
@@ -228,11 +228,28 @@ struct posix_acl *jffs2_get_acl(struct inode *inode, int type)
         return acl;
 }
 
+static int __jffs2_set_acl(struct inode *inode, int xprefix, struct posix_acl *acl)
+{
+        char *value = NULL;
+        size_t size = 0;
+        int rc;
+
+        if (acl) {
+                value = jffs2_acl_to_medium(acl, &size);
+                if (IS_ERR(value))
+                        return PTR_ERR(value);
+        }
+        rc = do_jffs2_setxattr(inode, xprefix, "", value, size, 0);
+        if (!value && rc == -ENODATA)
+                rc = 0;
+        kfree(value);
+
+        return rc;
+}
+
 static int jffs2_set_acl(struct inode *inode, int type, struct posix_acl *acl)
 {
         struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
-        size_t size = 0;
-        char *value = NULL;
         int rc, xprefix;
 
         if (S_ISLNK(inode->i_mode))
@@ -267,17 +284,7 @@ static int jffs2_set_acl(struct inode *inode, int type, struct posix_acl *acl)
         default:
                 return -EINVAL;
         }
-        if (acl) {
-                value = jffs2_acl_to_medium(acl, &size);
-                if (IS_ERR(value))
-                        return PTR_ERR(value);
-        }
-
-        rc = do_jffs2_setxattr(inode, xprefix, "", value, size, 0);
-        if (!value && rc == -ENODATA)
-                rc = 0;
-        if (value)
-                kfree(value);
+        rc = __jffs2_set_acl(inode, xprefix, acl);
         if (!rc) {
                 switch(type) {
                 case ACL_TYPE_ACCESS:
@@ -312,37 +319,59 @@ int jffs2_permission(struct inode *inode, int mask, struct nameidata *nd)
         return generic_permission(inode, mask, jffs2_check_acl);
 }
 
-int jffs2_init_acl(struct inode *inode, struct posix_acl *acl)
+int jffs2_init_acl_pre(struct inode *dir_i, struct inode *inode, int *i_mode)
 {
         struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
-        struct posix_acl *clone;
-        mode_t mode;
-        int rc = 0;
+        struct posix_acl *acl, *clone;
+        int rc;
 
-        f->i_acl_access = JFFS2_ACL_NOT_CACHED;
-        f->i_acl_default = JFFS2_ACL_NOT_CACHED;
+        f->i_acl_default = NULL;
+        f->i_acl_access = NULL;
+
+        if (S_ISLNK(*i_mode))
+                return 0;       /* Symlink always has no-ACL */
+
+        acl = jffs2_get_acl(dir_i, ACL_TYPE_DEFAULT);
+        if (IS_ERR(acl))
+                return PTR_ERR(acl);
+
+        if (!acl) {
+                *i_mode &= ~current->fs->umask;
+        } else {
+                if (S_ISDIR(*i_mode))
+                        jffs2_iset_acl(inode, &f->i_acl_default, acl);
 
-        if (acl) {
-                if (S_ISDIR(inode->i_mode)) {
-                        rc = jffs2_set_acl(inode, ACL_TYPE_DEFAULT, acl);
-                        if (rc)
-                                goto cleanup;
-                }
                 clone = posix_acl_clone(acl, GFP_KERNEL);
-                rc = -ENOMEM;
                 if (!clone)
-                        goto cleanup;
-                mode = inode->i_mode;
-                rc = posix_acl_create_masq(clone, &mode);
-                if (rc >= 0) {
-                        inode->i_mode = mode;
-                        if (rc > 0)
-                                rc = jffs2_set_acl(inode, ACL_TYPE_ACCESS, clone);
-                }
+                        return -ENOMEM;
+                rc = posix_acl_create_masq(clone, (mode_t *)i_mode);
+                if (rc < 0)
+                        return rc;
+                if (rc > 0)
+                        jffs2_iset_acl(inode, &f->i_acl_access, clone);
+
                 posix_acl_release(clone);
         }
- cleanup:
-        posix_acl_release(acl);
+        return 0;
+}
+
+int jffs2_init_acl_post(struct inode *inode)
+{
+        struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
+        int rc;
+
+        if (f->i_acl_default) {
+                rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_DEFAULT, f->i_acl_default);
+                if (rc)
+                        return rc;
+        }
+
+        if (f->i_acl_access) {
+                rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_ACCESS, f->i_acl_access);
+                if (rc)
+                        return rc;
+        }
+
         return rc;
 }
 
diff --git a/fs/jffs2/acl.h b/fs/jffs2/acl.h
index 90a2dbf59051..76c6ebd1acd9 100644
--- a/fs/jffs2/acl.h
+++ b/fs/jffs2/acl.h
@@ -31,7 +31,8 @@ struct jffs2_acl_header {
 extern struct posix_acl *jffs2_get_acl(struct inode *inode, int type);
 extern int jffs2_permission(struct inode *, int, struct nameidata *);
 extern int jffs2_acl_chmod(struct inode *);
-extern int jffs2_init_acl(struct inode *, struct posix_acl *);
+extern int jffs2_init_acl_pre(struct inode *, struct inode *, int *);
+extern int jffs2_init_acl_post(struct inode *);
 extern void jffs2_clear_acl(struct jffs2_inode_info *);
 
 extern struct xattr_handler jffs2_acl_access_xattr_handler;
@@ -39,10 +40,11 @@ extern struct xattr_handler jffs2_acl_default_xattr_handler;
 
 #else
 
-#define jffs2_get_acl(inode, type)      (NULL)
-#define jffs2_permission NULL
-#define jffs2_acl_chmod(inode)          (0)
-#define jffs2_init_acl(inode,dir)       (0)
+#define jffs2_get_acl(inode, type)              (NULL)
+#define jffs2_permission                        (NULL)
+#define jffs2_acl_chmod(inode)                  (0)
+#define jffs2_init_acl_pre(dir_i,inode,mode)    (0)
+#define jffs2_init_acl_post(inode)              (0)
 #define jffs2_clear_acl(f)
 
 #endif  /* CONFIG_JFFS2_FS_POSIX_ACL */
diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c
index 8353eb9c1799..787e392ffd41 100644
--- a/fs/jffs2/dir.c
+++ b/fs/jffs2/dir.c
@@ -182,7 +182,6 @@ static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
         struct jffs2_inode_info *f, *dir_f;
         struct jffs2_sb_info *c;
         struct inode *inode;
-        struct posix_acl *acl;
         int ret;
 
         ri = jffs2_alloc_raw_inode();
@@ -193,7 +192,7 @@ static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
 
         D1(printk(KERN_DEBUG "jffs2_create()\n"));
 
-        inode = jffs2_new_inode(dir_i, mode, ri, &acl);
+        inode = jffs2_new_inode(dir_i, mode, ri);
 
         if (IS_ERR(inode)) {
                 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
@@ -211,14 +210,6 @@ static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
 
         ret = jffs2_do_create(c, dir_f, f, ri,
                               dentry->d_name.name, dentry->d_name.len);
-
-        if (ret)
-                goto fail_acl;
-
-        ret = jffs2_init_security(inode, dir_i);
-        if (ret)
-                goto fail_acl;
-        ret = jffs2_init_acl(inode, acl);
         if (ret)
                 goto fail;
 
@@ -231,8 +222,6 @@ static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
                   inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages));
         return 0;
 
- fail_acl:
-        posix_acl_release(acl);
  fail:
         make_bad_inode(inode);
         iput(inode);
@@ -309,7 +298,6 @@ static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char
         struct jffs2_full_dirent *fd;
         int namelen;
         uint32_t alloclen;
-        struct posix_acl *acl;
         int ret, targetlen = strlen(target);
 
         /* FIXME: If you care. We'd need to use frags for the target
@@ -336,7 +324,7 @@ static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char
                 return ret;
         }
 
-        inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri, &acl);
+        inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
 
         if (IS_ERR(inode)) {
                 jffs2_free_raw_inode(ri);
@@ -366,7 +354,6 @@ static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char
                 up(&f->sem);
                 jffs2_complete_reservation(c);
                 jffs2_clear_inode(inode);
-                posix_acl_release(acl);
                 return PTR_ERR(fn);
         }
 
@@ -377,7 +364,6 @@ static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char
                 up(&f->sem);
                 jffs2_complete_reservation(c);
                 jffs2_clear_inode(inode);
-                posix_acl_release(acl);
                 return -ENOMEM;
         }
 
@@ -395,10 +381,9 @@ static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char
         ret = jffs2_init_security(inode, dir_i);
         if (ret) {
                 jffs2_clear_inode(inode);
-                posix_acl_release(acl);
                 return ret;
         }
-        ret = jffs2_init_acl(inode, acl);
+        ret = jffs2_init_acl_post(inode);
         if (ret) {
                 jffs2_clear_inode(inode);
                 return ret;
@@ -476,7 +461,6 @@ static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
         struct jffs2_full_dirent *fd;
         int namelen;
         uint32_t alloclen;
-        struct posix_acl *acl;
         int ret;
 
         mode |= S_IFDIR;
@@ -499,7 +483,7 @@ static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
                 return ret;
         }
 
-        inode = jffs2_new_inode(dir_i, mode, ri, &acl);
+        inode = jffs2_new_inode(dir_i, mode, ri);
 
         if (IS_ERR(inode)) {
                 jffs2_free_raw_inode(ri);
@@ -526,7 +510,6 @@ static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
                 up(&f->sem);
                 jffs2_complete_reservation(c);
                 jffs2_clear_inode(inode);
-                posix_acl_release(acl);
                 return PTR_ERR(fn);
         }
         /* No data here. Only a metadata node, which will be
@@ -540,10 +523,9 @@ static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
         ret = jffs2_init_security(inode, dir_i);
         if (ret) {
                 jffs2_clear_inode(inode);
-                posix_acl_release(acl);
                 return ret;
         }
-        ret = jffs2_init_acl(inode, acl);
+        ret = jffs2_init_acl_post(inode);
         if (ret) {
                 jffs2_clear_inode(inode);
                 return ret;
@@ -639,7 +621,6 @@ static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, de
         union jffs2_device_node dev;
         int devlen = 0;
         uint32_t alloclen;
-        struct posix_acl *acl;
         int ret;
 
         if (!new_valid_dev(rdev))
@@ -666,7 +647,7 @@ static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, de
                 return ret;
         }
 
-        inode = jffs2_new_inode(dir_i, mode, ri, &acl);
+        inode = jffs2_new_inode(dir_i, mode, ri);
 
         if (IS_ERR(inode)) {
                 jffs2_free_raw_inode(ri);
@@ -695,7 +676,6 @@ static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, de
                 up(&f->sem);
                 jffs2_complete_reservation(c);
                 jffs2_clear_inode(inode);
-                posix_acl_release(acl);
                 return PTR_ERR(fn);
         }
         /* No data here. Only a metadata node, which will be
@@ -709,10 +689,9 @@ static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, de
         ret = jffs2_init_security(inode, dir_i);
         if (ret) {
                 jffs2_clear_inode(inode);
-                posix_acl_release(acl);
                 return ret;
         }
-        ret = jffs2_init_acl(inode, acl);
+        ret = jffs2_init_acl_post(inode);
         if (ret) {
                 jffs2_clear_inode(inode);
                 return ret;
diff --git a/fs/jffs2/fs.c b/fs/jffs2/fs.c
index ed85f9afdbc8..d2e06f7ea96f 100644
--- a/fs/jffs2/fs.c
+++ b/fs/jffs2/fs.c
@@ -402,8 +402,7 @@ void jffs2_write_super (struct super_block *sb)
 
 /* jffs2_new_inode: allocate a new inode and inocache, add it to the hash,
    fill in the raw_inode while you're at it. */
-struct inode *jffs2_new_inode (struct inode *dir_i, int mode, struct jffs2_raw_inode *ri,
-                               struct posix_acl **acl)
+struct inode *jffs2_new_inode (struct inode *dir_i, int mode, struct jffs2_raw_inode *ri)
 {
         struct inode *inode;
         struct super_block *sb = dir_i->i_sb;
@@ -438,19 +437,11 @@ struct inode *jffs2_new_inode (struct inode *dir_i, int mode, struct jffs2_raw_i
 
         /* POSIX ACLs have to be processed now, at least partly.
            The umask is only applied if there's no default ACL */
-        if (!S_ISLNK(mode)) {
-                *acl = jffs2_get_acl(dir_i, ACL_TYPE_DEFAULT);
-                if (IS_ERR(*acl)) {
-                        make_bad_inode(inode);
-                        iput(inode);
-                        inode = (void *)*acl;
-                        *acl = NULL;
-                        return inode;
-                }
-                if (!(*acl))
-                        mode &= ~current->fs->umask;
-        } else {
-                *acl = NULL;
+        ret = jffs2_init_acl_pre(dir_i, inode, &mode);
+        if (ret) {
+            make_bad_inode(inode);
+            iput(inode);
+            return ERR_PTR(ret);
         }
         ret = jffs2_do_new_inode (c, f, mode, ri);
         if (ret) {
diff --git a/fs/jffs2/os-linux.h b/fs/jffs2/os-linux.h
index f6743a915cf3..bf64686cf098 100644
--- a/fs/jffs2/os-linux.h
+++ b/fs/jffs2/os-linux.h
@@ -173,15 +173,13 @@ int jffs2_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
 extern const struct inode_operations jffs2_symlink_inode_operations;
 
 /* fs.c */
-struct posix_acl;
-
 int jffs2_setattr (struct dentry *, struct iattr *);
 int jffs2_do_setattr (struct inode *, struct iattr *);
 void jffs2_read_inode (struct inode *);
 void jffs2_clear_inode (struct inode *);
 void jffs2_dirty_inode(struct inode *inode);
 struct inode *jffs2_new_inode (struct inode *dir_i, int mode,
-                               struct jffs2_raw_inode *ri, struct posix_acl **acl);
+                               struct jffs2_raw_inode *ri);
 int jffs2_statfs (struct dentry *, struct kstatfs *);
 void jffs2_write_super (struct super_block *);
 int jffs2_remount_fs (struct super_block *, int *, char *);
diff --git a/fs/jffs2/write.c b/fs/jffs2/write.c
index 2f5695446d0f..147e2cbee9e4 100644
--- a/fs/jffs2/write.c
+++ b/fs/jffs2/write.c
@@ -465,6 +465,14 @@ int jffs2_do_create(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, str
 
         up(&f->sem);
         jffs2_complete_reservation(c);
+
+        ret = jffs2_init_security(&f->vfs_inode, &dir_f->vfs_inode);
+        if (ret)
+                return ret;
+        ret = jffs2_init_acl_post(&f->vfs_inode);
+        if (ret)
+                return ret;
+
         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
                                 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));