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FS-Cache fixes

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Merge tag 'fscache-fixes-20141013' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs

Pull fs-cache fixes from David Howells:
 "Two fixes for bugs in CacheFiles and a cleanup in FS-Cache"

* tag 'fscache-fixes-20141013' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
  fs/fscache/object-list.c: use __seq_open_private()
  CacheFiles: Fix incorrect test for in-memory object collision
  CacheFiles: Handle object being killed before being set up
This commit is contained in:
Linus Torvalds 2014-10-14 08:40:15 +02:00
commit 1b5a5f59e3
3 changed files with 23 additions and 28 deletions
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33
fs/cachefiles/interface.c
View File

@ -268,20 +268,27 @@ static void cachefiles_drop_object(struct fscache_object *_object)
ASSERT((atomic_read(&object->usage) & 0xffff0000) != 0x6b6b0000);
#endif
/* delete retired objects */
if (test_bit(FSCACHE_OBJECT_RETIRED, &object->fscache.flags) &&
_object != cache->cache.fsdef
) {
_debug("- retire object OBJ%x", object->fscache.debug_id);
cachefiles_begin_secure(cache, &saved_cred);
cachefiles_delete_object(cache, object);
cachefiles_end_secure(cache, saved_cred);
}
/* We need to tidy the object up if we did in fact manage to open it.
* It's possible for us to get here before the object is fully
* initialised if the parent goes away or the object gets retired
* before we set it up.
*/
if (object->dentry) {
/* delete retired objects */
if (test_bit(FSCACHE_OBJECT_RETIRED, &object->fscache.flags) &&
_object != cache->cache.fsdef
) {
_debug("- retire object OBJ%x", object->fscache.debug_id);
cachefiles_begin_secure(cache, &saved_cred);
cachefiles_delete_object(cache, object);
cachefiles_end_secure(cache, saved_cred);
}
/* close the filesystem stuff attached to the object */
if (object->backer != object->dentry)
dput(object->backer);
object->backer = NULL;
/* close the filesystem stuff attached to the object */
if (object->backer != object->dentry)
dput(object->backer);
object->backer = NULL;
}
/* note that the object is now inactive */
if (test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags)) {

2
fs/cachefiles/namei.c
View File

@ -189,7 +189,7 @@ try_again:
/* an old object from a previous incarnation is hogging the slot - we
* need to wait for it to be destroyed */
wait_for_old_object:
if (fscache_object_is_live(&object->fscache)) {
if (fscache_object_is_live(&xobject->fscache)) {
pr_err("\n");
pr_err("Error: Unexpected object collision\n");
cachefiles_printk_object(object, xobject);

16
fs/fscache/object-list.c
View File

@ -380,26 +380,14 @@ no_config:
static int fscache_objlist_open(struct inode *inode, struct file *file)
{
struct fscache_objlist_data *data;
struct seq_file *m;
int ret;
ret = seq_open(file, &fscache_objlist_ops);
if (ret < 0)
return ret;
m = file->private_data;
/* buffer for key extraction */
data = kmalloc(sizeof(struct fscache_objlist_data), GFP_KERNEL);
if (!data) {
seq_release(inode, file);
data = __seq_open_private(file, &fscache_objlist_ops, sizeof(*data));
if (!data)
return -ENOMEM;
}
/* get the configuration key */
fscache_objlist_config(data);
m->private = data;
return 0;
}