[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>

1 files changed, 7 insertions, 28 deletions

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;