diff options
Diffstat (limited to 'fs/dcache.c')
| -rw-r--r-- | fs/dcache.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/fs/dcache.c b/fs/dcache.c index 6ee6bc40cb63..814e5f491e9c 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -1589,6 +1589,33 @@ void d_rehash(struct dentry * entry) } EXPORT_SYMBOL(d_rehash); +/** + * dentry_update_name_case - update case insensitive dentry with a new name + * @dentry: dentry to be updated + * @name: new name + * + * Update a case insensitive dentry with new case of name. + * + * dentry must have been returned by d_lookup with name @name. Old and new + * name lengths must match (ie. no d_compare which allows mismatched name + * lengths). + * + * Parent inode i_mutex must be held over d_lookup and into this call (to + * keep renames and concurrent inserts, and readdir(2) away). + */ +void dentry_update_name_case(struct dentry *dentry, struct qstr *name) +{ + BUG_ON(!mutex_is_locked(&dentry->d_inode->i_mutex)); + BUG_ON(dentry->d_name.len != name->len); /* d_lookup gives this */ + + spin_lock(&dcache_lock); + spin_lock(&dentry->d_lock); + memcpy((unsigned char *)dentry->d_name.name, name->name, name->len); + spin_unlock(&dentry->d_lock); + spin_unlock(&dcache_lock); +} +EXPORT_SYMBOL(dentry_update_name_case); + /* * When switching names, the actual string doesn't strictly have to * be preserved in the target - because we're dropping the target |