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authorChristoph Hellwig <hch@infradead.org>2013-12-20 05:16:51 -0800
committerAl Viro <viro@zeniv.linux.org.uk>2014-01-25 23:58:22 -0500
commit2cc6a5a01cdbeb0e46f3aa144819d5d7cee458a1 (patch)
treed97137eadb3a11dfd12c7bc7bb552ce21e8e4688 /fs/jfs/xattr.c
parent2401dc2975fc5a33021dc8347ea82984c4707a08 (diff)
downloadlinux-2cc6a5a01cdbeb0e46f3aa144819d5d7cee458a1.tar.bz2
jfs: use generic posix ACL infrastructure
Copy the scheme I introduced to btrfs many years ago to only use the xattr handler for ACLs, but pass plain attrs straight through. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Kleikamp <dave.kleikamp@oracle.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/jfs/xattr.c')
-rw-r--r--fs/jfs/xattr.c108
1 files changed, 38 insertions, 70 deletions
diff --git a/fs/jfs/xattr.c b/fs/jfs/xattr.c
index d3472f4cd530..5324e4e2b992 100644
--- a/fs/jfs/xattr.c
+++ b/fs/jfs/xattr.c
@@ -666,81 +666,12 @@ static int ea_put(tid_t tid, struct inode *inode, struct ea_buffer *ea_buf,
}
/*
- * can_set_system_xattr
- *
- * This code is specific to the system.* namespace. It contains policy
- * which doesn't belong in the main xattr codepath.
- */
-static int can_set_system_xattr(struct inode *inode, const char *name,
- const void *value, size_t value_len)
-{
-#ifdef CONFIG_JFS_POSIX_ACL
- struct posix_acl *acl;
- int rc;
-
- if (!inode_owner_or_capable(inode))
- return -EPERM;
-
- /*
- * POSIX_ACL_XATTR_ACCESS is tied to i_mode
- */
- if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0) {
- acl = posix_acl_from_xattr(&init_user_ns, value, value_len);
- if (IS_ERR(acl)) {
- rc = PTR_ERR(acl);
- printk(KERN_ERR "posix_acl_from_xattr returned %d\n",
- rc);
- return rc;
- }
- if (acl) {
- rc = posix_acl_equiv_mode(acl, &inode->i_mode);
- posix_acl_release(acl);
- if (rc < 0) {
- printk(KERN_ERR
- "posix_acl_equiv_mode returned %d\n",
- rc);
- return rc;
- }
- mark_inode_dirty(inode);
- }
- /*
- * We're changing the ACL. Get rid of the cached one
- */
- forget_cached_acl(inode, ACL_TYPE_ACCESS);
-
- return 0;
- } else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0) {
- acl = posix_acl_from_xattr(&init_user_ns, value, value_len);
- if (IS_ERR(acl)) {
- rc = PTR_ERR(acl);
- printk(KERN_ERR "posix_acl_from_xattr returned %d\n",
- rc);
- return rc;
- }
- posix_acl_release(acl);
-
- /*
- * We're changing the default ACL. Get rid of the cached one
- */
- forget_cached_acl(inode, ACL_TYPE_DEFAULT);
-
- return 0;
- }
-#endif /* CONFIG_JFS_POSIX_ACL */
- return -EOPNOTSUPP;
-}
-
-/*
* Most of the permission checking is done by xattr_permission in the vfs.
- * The local file system is responsible for handling the system.* namespace.
* We also need to verify that this is a namespace that we recognize.
*/
static int can_set_xattr(struct inode *inode, const char *name,
const void *value, size_t value_len)
{
- if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
- return can_set_system_xattr(inode, name, value, value_len);
-
if (!strncmp(name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN)) {
/*
* This makes sure that we aren't trying to set an
@@ -748,7 +679,7 @@ static int can_set_xattr(struct inode *inode, const char *name,
* with "os2."
*/
if (is_known_namespace(name + XATTR_OS2_PREFIX_LEN))
- return -EOPNOTSUPP;
+ return -EOPNOTSUPP;
return 0;
}
@@ -913,6 +844,14 @@ int jfs_setxattr(struct dentry *dentry, const char *name, const void *value,
if ((rc = can_set_xattr(inode, name, value, value_len)))
return rc;
+ /*
+ * If this is a request for a synthetic attribute in the system.*
+ * namespace use the generic infrastructure to resolve a handler
+ * for it via sb->s_xattr.
+ */
+ if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
+ return generic_setxattr(dentry, name, value, value_len, flags);
+
if (value == NULL) { /* empty EA, do not remove */
value = "";
value_len = 0;
@@ -986,6 +925,14 @@ ssize_t jfs_getxattr(struct dentry *dentry, const char *name, void *data,
{
int err;
+ /*
+ * If this is a request for a synthetic attribute in the system.*
+ * namespace use the generic infrastructure to resolve a handler
+ * for it via sb->s_xattr.
+ */
+ if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
+ return generic_getxattr(dentry, name, data, buf_size);
+
if (strncmp(name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) == 0) {
/*
* skip past "os2." prefix
@@ -1077,6 +1024,14 @@ int jfs_removexattr(struct dentry *dentry, const char *name)
if ((rc = can_set_xattr(inode, name, NULL, 0)))
return rc;
+ /*
+ * If this is a request for a synthetic attribute in the system.*
+ * namespace use the generic infrastructure to resolve a handler
+ * for it via sb->s_xattr.
+ */
+ if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
+ return generic_removexattr(dentry, name);
+
tid = txBegin(inode->i_sb, 0);
mutex_lock(&ji->commit_mutex);
rc = __jfs_setxattr(tid, dentry->d_inode, name, NULL, 0, XATTR_REPLACE);
@@ -1088,6 +1043,19 @@ int jfs_removexattr(struct dentry *dentry, const char *name)
return rc;
}
+/*
+ * List of handlers for synthetic system.* attributes. All real ondisk
+ * attributes are handled directly.
+ */
+const struct xattr_handler *jfs_xattr_handlers[] = {
+#ifdef JFS_POSIX_ACL
+ &posix_acl_access_xattr_handler,
+ &posix_acl_default_xattr_handler,
+#endif
+ NULL,
+};
+
+
#ifdef CONFIG_JFS_SECURITY
static int jfs_initxattrs(struct inode *inode, const struct xattr *xattr_array,
void *fs_info)