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authorAl Viro <viro@zeniv.linux.org.uk>2009-06-09 13:29:39 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2009-06-24 08:17:07 -0400
commit1cbd20d820c36f52543e3e4cd0067ebf52aa388f (patch)
tree51d53ee4b6f79031eb493d7d2f2a57a7be3a3955 /fs/xfs/linux-2.6/xfs_acl.c
parenthelpers for acl caching + switch to those (diff)
downloadlinux-dev-1cbd20d820c36f52543e3e4cd0067ebf52aa388f.tar.xz
linux-dev-1cbd20d820c36f52543e3e4cd0067ebf52aa388f.zip
switch xfs to generic acl caching helpers
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/xfs/linux-2.6/xfs_acl.c')
-rw-r--r--fs/xfs/linux-2.6/xfs_acl.c73
1 files changed, 9 insertions, 64 deletions
diff --git a/fs/xfs/linux-2.6/xfs_acl.c b/fs/xfs/linux-2.6/xfs_acl.c
index 1e9d1246eebc..b23a54506446 100644
--- a/fs/xfs/linux-2.6/xfs_acl.c
+++ b/fs/xfs/linux-2.6/xfs_acl.c
@@ -25,14 +25,10 @@
#include <linux/posix_acl_xattr.h>
-#define XFS_ACL_NOT_CACHED ((void *)-1)
-
/*
* Locking scheme:
* - all ACL updates are protected by inode->i_mutex, which is taken before
* calling into this file.
- * - access and updates to the ip->i_acl and ip->i_default_acl pointers are
- * protected by inode->i_lock.
*/
STATIC struct posix_acl *
@@ -102,59 +98,35 @@ xfs_acl_to_disk(struct xfs_acl *aclp, const struct posix_acl *acl)
}
}
-/*
- * Update the cached ACL pointer in the inode.
- *
- * Because we don't hold any locks while reading/writing the attribute
- * from/to disk another thread could have raced and updated the cached
- * ACL value before us. In that case we release the previous cached value
- * and update it with our new value.
- */
-STATIC void
-xfs_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 != XFS_ACL_NOT_CACHED)
- posix_acl_release(*p_acl);
- *p_acl = posix_acl_dup(acl);
- spin_unlock(&inode->i_lock);
-}
-
struct posix_acl *
xfs_get_acl(struct inode *inode, int type)
{
struct xfs_inode *ip = XFS_I(inode);
- struct posix_acl *acl = NULL, **p_acl;
+ struct posix_acl *acl;
struct xfs_acl *xfs_acl;
int len = sizeof(struct xfs_acl);
char *ea_name;
int error;
+ acl = get_cached_acl(inode, type);
+ if (acl != ACL_NOT_CACHED)
+ return acl;
+
switch (type) {
case ACL_TYPE_ACCESS:
ea_name = SGI_ACL_FILE;
- p_acl = &ip->i_acl;
break;
case ACL_TYPE_DEFAULT:
ea_name = SGI_ACL_DEFAULT;
- p_acl = &ip->i_default_acl;
break;
default:
- return ERR_PTR(-EINVAL);
+ BUG();
}
- spin_lock(&inode->i_lock);
- if (*p_acl != XFS_ACL_NOT_CACHED)
- acl = posix_acl_dup(*p_acl);
- spin_unlock(&inode->i_lock);
-
/*
* If we have a cached ACLs value just return it, not need to
* go out to the disk.
*/
- if (acl)
- return acl;
xfs_acl = kzalloc(sizeof(struct xfs_acl), GFP_KERNEL);
if (!xfs_acl)
@@ -165,7 +137,7 @@ xfs_get_acl(struct inode *inode, int type)
/*
* If the attribute doesn't exist make sure we have a negative
* cache entry, for any other error assume it is transient and
- * leave the cache entry as XFS_ACL_NOT_CACHED.
+ * leave the cache entry as ACL_NOT_CACHED.
*/
if (error == -ENOATTR) {
acl = NULL;
@@ -179,7 +151,7 @@ xfs_get_acl(struct inode *inode, int type)
goto out;
out_update_cache:
- xfs_update_cached_acl(inode, p_acl, acl);
+ set_cached_acl(inode, type, acl);
out:
kfree(xfs_acl);
return acl;
@@ -189,7 +161,6 @@ STATIC int
xfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
{
struct xfs_inode *ip = XFS_I(inode);
- struct posix_acl **p_acl;
char *ea_name;
int error;
@@ -199,13 +170,11 @@ xfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
switch (type) {
case ACL_TYPE_ACCESS:
ea_name = SGI_ACL_FILE;
- p_acl = &ip->i_acl;
break;
case ACL_TYPE_DEFAULT:
if (!S_ISDIR(inode->i_mode))
return acl ? -EACCES : 0;
ea_name = SGI_ACL_DEFAULT;
- p_acl = &ip->i_default_acl;
break;
default:
return -EINVAL;
@@ -242,7 +211,7 @@ xfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
}
if (!error)
- xfs_update_cached_acl(inode, p_acl, acl);
+ set_cached_acl(inode, type, acl);
return error;
}
@@ -384,30 +353,6 @@ xfs_acl_chmod(struct inode *inode)
return error;
}
-void
-xfs_inode_init_acls(struct xfs_inode *ip)
-{
- /*
- * No need for locking, inode is not live yet.
- */
- ip->i_acl = XFS_ACL_NOT_CACHED;
- ip->i_default_acl = XFS_ACL_NOT_CACHED;
-}
-
-void
-xfs_inode_clear_acls(struct xfs_inode *ip)
-{
- /*
- * No need for locking here, the inode is not live anymore
- * and just about to be freed.
- */
- if (ip->i_acl != XFS_ACL_NOT_CACHED)
- posix_acl_release(ip->i_acl);
- if (ip->i_default_acl != XFS_ACL_NOT_CACHED)
- posix_acl_release(ip->i_default_acl);
-}
-
-
/*
* System xattr handlers.
*