ref: 400b183c480845e1cd2c2f49f74baade00d2653c
parent: 01c6151eb539b10954a8459193482524f4365242
author: root <ngkaho1234@gmail.com>
date: Sun Sep 20 12:31:38 EDT 2015
Hardlink suppert: ext4_flink interface proposed.
--- a/lwext4/ext4.c
+++ b/lwext4/ext4.c
@@ -881,6 +881,53 @@
return r;
}
+int ext4_flink(const char *path, const char *hardlink_path)
+{+ int r;
+ ext4_file f;
+ uint32_t name_off;
+ bool child_loaded = false;
+ uint32_t parent_inode, child_inode;
+ struct ext4_mountpoint *mp = ext4_get_mount(path);
+ struct ext4_mountpoint *target_mp = ext4_get_mount(hardlink_path);
+ struct ext4_inode_ref child_ref;
+
+ if (!mp)
+ return ENOENT;
+
+ /* Will that happen? Anyway return EINVAL for such case. */
+ if (mp != target_mp)
+ return EINVAL;
+
+ EXT4_MP_LOCK(mp);
+
+ r = ext4_generic_open2(&f, path, O_RDONLY,
+ EXT4_DIRECTORY_FILETYPE_UNKNOWN,
+ &parent_inode, &name_off);
+ if (r != EOK)
+ goto Finish;
+
+ child_inode = f.inode;
+ ext4_fclose(&f);
+
+ /*We have file to unlink. Load it.*/
+ r = ext4_fs_get_inode_ref(&mp->fs, child_inode, &child_ref);
+ if (r != EOK)
+ goto Finish;
+
+ child_loaded = true;
+
+ r = __ext4_create_hardlink(hardlink_path, &child_ref);
+
+Finish:
+ if (child_loaded)
+ ext4_fs_put_inode_ref(&child_ref);
+
+ EXT4_MP_UNLOCK(mp);
+ return r;
+
+}
+
int ext4_frename(const char *path, const char *new_path)
{int r;
--- a/lwext4/ext4.h
+++ b/lwext4/ext4.h
@@ -258,6 +258,12 @@
* @return standard error code */
int ext4_fremove(const char *path);
+/**@brief create a hardlink for a file.
+ * @param path path to file
+ * @param hardlink_path path of hardlink
+ * @return standard error code */
+int ext4_flink(const char *path, const char *hardlink_path);
+
/**@brief Rename file
* @param path source
* @param new_path destination