This is a note to let you know that I've just added the patch titled
FS-Cache: Don't override netfs's primary_index if registering failed
to the 4.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
fs-cache-don-t-override-netfs-s-primary_index-if-registering-failed.patch
and it can be found in the queue-4.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b130ed5998e62879a66bad08931a2b5e832da95c Mon Sep 17 00:00:00 2001
From: Kinglong Mee <kinglongmee@xxxxxxxxx>
Date: Wed, 4 Nov 2015 15:20:24 +0000
Subject: FS-Cache: Don't override netfs's primary_index if registering failed
From: Kinglong Mee <kinglongmee@xxxxxxxxx>
commit b130ed5998e62879a66bad08931a2b5e832da95c upstream.
Only override netfs->primary_index when registering success.
Signed-off-by: Kinglong Mee <kinglongmee@xxxxxxxxx>
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/fscache/netfs.c | 37 ++++++++++++++++++-------------------
1 file changed, 18 insertions(+), 19 deletions(-)
--- a/fs/fscache/netfs.c
+++ b/fs/fscache/netfs.c
@@ -22,6 +22,7 @@ static LIST_HEAD(fscache_netfs_list);
int __fscache_register_netfs(struct fscache_netfs *netfs)
{
struct fscache_netfs *ptr;
+ struct fscache_cookie *cookie;
int ret;
_enter("{%s}", netfs->name);
@@ -29,26 +30,25 @@ int __fscache_register_netfs(struct fsca
INIT_LIST_HEAD(&netfs->link);
/* allocate a cookie for the primary index */
- netfs->primary_index =
- kmem_cache_zalloc(fscache_cookie_jar, GFP_KERNEL);
+ cookie = kmem_cache_zalloc(fscache_cookie_jar, GFP_KERNEL);
- if (!netfs->primary_index) {
+ if (!cookie) {
_leave(" = -ENOMEM");
return -ENOMEM;
}
/* initialise the primary index cookie */
- atomic_set(&netfs->primary_index->usage, 1);
- atomic_set(&netfs->primary_index->n_children, 0);
- atomic_set(&netfs->primary_index->n_active, 1);
-
- netfs->primary_index->def = &fscache_fsdef_netfs_def;
- netfs->primary_index->parent = &fscache_fsdef_index;
- netfs->primary_index->netfs_data = netfs;
- netfs->primary_index->flags = 1 << FSCACHE_COOKIE_ENABLED;
+ atomic_set(&cookie->usage, 1);
+ atomic_set(&cookie->n_children, 0);
+ atomic_set(&cookie->n_active, 1);
+
+ cookie->def = &fscache_fsdef_netfs_def;
+ cookie->parent = &fscache_fsdef_index;
+ cookie->netfs_data = netfs;
+ cookie->flags = 1 << FSCACHE_COOKIE_ENABLED;
- spin_lock_init(&netfs->primary_index->lock);
- INIT_HLIST_HEAD(&netfs->primary_index->backing_objects);
+ spin_lock_init(&cookie->lock);
+ INIT_HLIST_HEAD(&cookie->backing_objects);
/* check the netfs type is not already present */
down_write(&fscache_addremove_sem);
@@ -59,9 +59,10 @@ int __fscache_register_netfs(struct fsca
goto already_registered;
}
- atomic_inc(&netfs->primary_index->parent->usage);
- atomic_inc(&netfs->primary_index->parent->n_children);
+ atomic_inc(&cookie->parent->usage);
+ atomic_inc(&cookie->parent->n_children);
+ netfs->primary_index = cookie;
list_add(&netfs->link, &fscache_netfs_list);
ret = 0;
@@ -70,10 +71,8 @@ int __fscache_register_netfs(struct fsca
already_registered:
up_write(&fscache_addremove_sem);
- if (ret < 0) {
- kmem_cache_free(fscache_cookie_jar, netfs->primary_index);
- netfs->primary_index = NULL;
- }
+ if (ret < 0)
+ kmem_cache_free(fscache_cookie_jar, cookie);
_leave(" = %d", ret);
return ret;
Patches currently in stable-queue which might be from kinglongmee@xxxxxxxxx are
queue-4.3/fs-cache-increase-reference-of-parent-after-registering-netfs-success.patch
queue-4.3/fs-cache-don-t-override-netfs-s-primary_index-if-registering-failed.patch
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