Introduce helpers for registering and cleaning up extra xattr name
prefix.
Signed-off-by: Jingbo Xu <[email protected]>
---
include/erofs/xattr.h | 3 +++
lib/xattr.c | 58 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 61 insertions(+)
diff --git a/include/erofs/xattr.h b/include/erofs/xattr.h
index 9efadc5..1085908 100644
--- a/include/erofs/xattr.h
+++ b/include/erofs/xattr.h
@@ -70,6 +70,9 @@ int erofs_prepare_xattr_ibody(struct erofs_inode *inode);
char *erofs_export_xattr_ibody(struct list_head *ixattrs, unsigned int size);
int erofs_build_shared_xattrs_from_path(const char *path);
+int erofs_insert_ea_type(const char *prefix);
+void erofs_cleanup_ea_type(void);
+
#ifdef __cplusplus
}
#endif
diff --git a/lib/xattr.c b/lib/xattr.c
index a292f2c..ec40aad 100644
--- a/lib/xattr.c
+++ b/lib/xattr.c
@@ -61,6 +61,14 @@ static struct xattr_prefix {
}
};
+struct ea_type_node {
+ struct list_head list;
+ struct xattr_prefix type;
+ u8 index;
+};
+static LIST_HEAD(ea_types);
+static unsigned int ea_types_count;
+
static unsigned int BKDRHash(char *str, unsigned int len)
{
const unsigned int seed = 131313;
@@ -1222,3 +1230,53 @@ int erofs_listxattr(struct erofs_inode *vi, char
*buffer, size_t buffer_size)
return ret;
return shared_listxattr(vi, &it);
}
+
+int erofs_insert_ea_type(const char *prefix)
+{
+ struct ea_type_node *tnode;
+ struct xattr_prefix *p;
+ bool matched = false;
+ char *s;
+
+ if (ea_types_count == EROFS_XATTR_EA_FLAG || strlen(prefix) > UINT8_MAX)
+ return -EOVERFLOW;
+
+ for (p = xattr_types; p < xattr_types + ARRAY_SIZE(xattr_types); ++p) {
+ if (!strncmp(p->prefix, prefix, p->prefix_len)) {
+ matched = true;
+ break;
+ }
+ }
+ if (!matched)
+ return -ENODATA;
+
+ s = strdup(prefix);
+ if (!s)
+ return -ENOMEM;
+
+ tnode = malloc(sizeof(*tnode));
+ if (!tnode) {
+ free(s);
+ return -ENOMEM;
+ }
+
+ tnode->type.prefix = s;
+ tnode->type.prefix_len = strlen(prefix);
+
+ tnode->index = EROFS_XATTR_EA_FLAG | ea_types_count;
+ ea_types_count++;
+ init_list_head(&tnode->list);
+ list_add_tail(&tnode->list, &ea_types);
+ return 0;
+}
+
+void erofs_cleanup_ea_type(void)
+{
+ struct ea_type_node *tnode, *n;
+
+ list_for_each_entry_safe(tnode, n, &ea_types, list) {
+ list_del(&tnode->list);
+ free(tnode->type.prefix);
+ free(tnode);
+ }
+}
--
2.19.1.6.gb485710b
