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authorAndreas Gruenbacher <agruenba@redhat.com>2015-12-02 14:44:36 +0100
committerAl Viro <viro@zeniv.linux.org.uk>2015-12-06 21:33:52 -0500
commit98e9cb5711c68223f0e4d5201b9a6add255ec550 (patch)
tree12fee55d296fc85a6e8188368ca4944fc4d913a8 /include/linux/xattr.h
parent97d79299223baab330b194437e676d301f12d5f6 (diff)
vfs: Distinguish between full xattr names and proper prefixes
Add an additional "name" field to struct xattr_handler. When the name is set, the handler matches attributes with exactly that name. When the prefix is set instead, the handler matches attributes with the given prefix and with a non-empty suffix. This patch should avoid bugs like the one fixed in commit c361016a in the future. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Reviewed-by: James Morris <james.l.morris@oracle.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/xattr.h')
-rw-r--r--include/linux/xattr.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/xattr.h b/include/linux/xattr.h
index 45fa3456a0cc..03c847fb6cc1 100644
--- a/include/linux/xattr.h
+++ b/include/linux/xattr.h
@@ -19,7 +19,13 @@
struct inode;
struct dentry;
+/*
+ * struct xattr_handler: When @name is set, match attributes with exactly that
+ * name. When @prefix is set instead, match attributes with that prefix and
+ * with a non-empty suffix.
+ */
struct xattr_handler {
+ const char *name;
const char *prefix;
int flags; /* fs private flags */
size_t (*list)(const struct xattr_handler *, struct dentry *dentry,
@@ -54,6 +60,11 @@ int generic_removexattr(struct dentry *dentry, const char *name);
ssize_t vfs_getxattr_alloc(struct dentry *dentry, const char *name,
char **xattr_value, size_t size, gfp_t flags);
+static inline const char *xattr_prefix(const struct xattr_handler *handler)
+{
+ return handler->prefix ?: handler->name;
+}
+
struct simple_xattrs {
struct list_head head;
spinlock_t lock;