When a sysfs_node or one of its ancestors is renamed, automatically
rename symlinks pointing to it according to the name format together.
Note that as links created with kobject based sysfs_create_link()
aren't chained on its target, they aren't renamed automatically. This
is for backward compatibility.
Signed-off-by: Tejun Heo <[email protected]>
---
fs/sysfs/dir.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 45 insertions(+), 0 deletions(-)
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 4a04cb4..eac8fef 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -1196,6 +1196,7 @@ static int sysfs_prep_rename(struct sysfs_rename_context *rcxt,
{
struct sysfs_rcxt_rename_ent *rent;
struct sysfs_rcxt_mutex_ent *ment;
+ struct sysfs_dirent *cur;
int rc;
INIT_LIST_HEAD(&rcxt->mutexes);
@@ -1220,6 +1221,50 @@ static int sysfs_prep_rename(struct sysfs_rename_context *rcxt,
goto err;
/*
+ * prep links pointing to @sd and its children
+ */
+ cur = NULL;
+ while ((cur = sysfs_tree_walk_next(sd, cur))) {
+ struct sysfs_dirent *link;
+
+ if (sysfs_type(cur) != SYSFS_DIR)
+ continue;
+
+ for (link = cur->s_dir.links; link; link = link->s_link.next) {
+ const char *link_new_name;
+ int copied;
+
+ rc = sysfs_link_name(link->s_link.name_fmt,
+ link->s_link.target,
+ &link_new_name,
+ sd, new_parent, new_name);
+ if (rc < 0)
+ goto err;
+ copied = rc;
+
+ if (!strcmp(link->s_name, link_new_name)) {
+ if (copied)
+ kfree(link_new_name);
+ continue;
+ }
+
+ rc = -ENOMEM;
+ rent = sysfs_rcxt_add(rcxt, link, link->s_parent);
+ if (!rent) {
+ mutex_unlock(&sysfs_mutex);
+ goto err;
+ }
+
+ rent->new_name = link_new_name;
+ rent->new_name_copied = copied;
+
+ rc = sysfs_rcxt_get_dentries(rcxt, rent);
+ if (rc)
+ goto err;
+ }
+ }
+
+ /*
* lock all i_mutexes
*/
try_lock:
--
1.5.0.3
-
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