helpers for acl caching + switch to those
helpers: get_cached_acl(inode, type), set_cached_acl(inode, type, acl),
forget_cached_acl(inode, type).
ubifs/xattr.c needed includes reordered, the rest is a plain switchover.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/btrfs/acl.c b/fs/btrfs/acl.c
index 6db8a42..f128427 100644
--- a/fs/btrfs/acl.c
+++ b/fs/btrfs/acl.c
@@ -29,51 +29,28 @@
#ifdef CONFIG_FS_POSIX_ACL
-static void btrfs_update_cached_acl(struct inode *inode,
- struct posix_acl **p_acl,
- struct posix_acl *acl)
-{
- spin_lock(&inode->i_lock);
- if (*p_acl && *p_acl != ACL_NOT_CACHED)
- posix_acl_release(*p_acl);
- *p_acl = posix_acl_dup(acl);
- spin_unlock(&inode->i_lock);
-}
-
static struct posix_acl *btrfs_get_acl(struct inode *inode, int type)
{
int size;
const char *name;
char *value = NULL;
- struct posix_acl *acl = NULL, **p_acl;
+ struct posix_acl *acl;
+
+ acl = get_cached_acl(inode, type);
+ if (acl != ACL_NOT_CACHED)
+ return acl;
switch (type) {
case ACL_TYPE_ACCESS:
name = POSIX_ACL_XATTR_ACCESS;
- p_acl = &inode->i_acl;
break;
case ACL_TYPE_DEFAULT:
name = POSIX_ACL_XATTR_DEFAULT;
- p_acl = &inode->i_default_acl;
break;
default:
- return ERR_PTR(-EINVAL);
+ BUG();
}
- /* Handle the cached NULL acl case without locking */
- acl = ACCESS_ONCE(*p_acl);
- if (!acl)
- return acl;
-
- spin_lock(&inode->i_lock);
- acl = *p_acl;
- if (acl != ACL_NOT_CACHED)
- acl = posix_acl_dup(acl);
- spin_unlock(&inode->i_lock);
-
- if (acl != ACL_NOT_CACHED)
- return acl;
-
size = __btrfs_getxattr(inode, name, "", 0);
if (size > 0) {
value = kzalloc(size, GFP_NOFS);
@@ -82,13 +59,13 @@
size = __btrfs_getxattr(inode, name, value, size);
if (size > 0) {
acl = posix_acl_from_xattr(value, size);
- btrfs_update_cached_acl(inode, p_acl, acl);
+ set_cached_acl(inode, type, acl);
}
kfree(value);
} else if (size == -ENOENT || size == -ENODATA || size == 0) {
/* FIXME, who returns -ENOENT? I think nobody */
acl = NULL;
- btrfs_update_cached_acl(inode, p_acl, acl);
+ set_cached_acl(inode, type, acl);
} else {
acl = ERR_PTR(-EIO);
}
@@ -121,7 +98,6 @@
{
int ret, size = 0;
const char *name;
- struct posix_acl **p_acl;
char *value = NULL;
mode_t mode;
@@ -141,13 +117,11 @@
ret = 0;
inode->i_mode = mode;
name = POSIX_ACL_XATTR_ACCESS;
- p_acl = &inode->i_acl;
break;
case ACL_TYPE_DEFAULT:
if (!S_ISDIR(inode->i_mode))
return acl ? -EINVAL : 0;
name = POSIX_ACL_XATTR_DEFAULT;
- p_acl = &inode->i_default_acl;
break;
default:
return -EINVAL;
@@ -172,7 +146,7 @@
kfree(value);
if (!ret)
- btrfs_update_cached_acl(inode, p_acl, acl);
+ set_cached_acl(inode, type, acl);
return ret;
}