This is a note to let you know that I've just added the patch titled
FS-Cache: Increase reference of parent after registering, netfs success
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-increase-reference-of-parent-after-registering-netfs-success.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 86108c2e34a26e4bec3c6ddb23390bf8cedcf391 Mon Sep 17 00:00:00 2001
From: Kinglong Mee <kinglongmee@xxxxxxxxx>
Date: Wed, 4 Nov 2015 15:20:15 +0000
Subject: FS-Cache: Increase reference of parent after registering, netfs success
From: Kinglong Mee <kinglongmee@xxxxxxxxx>
commit 86108c2e34a26e4bec3c6ddb23390bf8cedcf391 upstream.
If netfs exist, fscache should not increase the reference of parent's
usage and n_children, otherwise, never be decreased.
v2: thanks David's suggest,
move increasing reference of parent if success
use kmem_cache_free() freeing primary_index directly
v3: don't move "netfs->primary_index->parent = &fscache_fsdef_index;"
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 | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
--- a/fs/fscache/netfs.c
+++ b/fs/fscache/netfs.c
@@ -47,9 +47,6 @@ int __fscache_register_netfs(struct fsca
netfs->primary_index->netfs_data = netfs;
netfs->primary_index->flags = 1 << FSCACHE_COOKIE_ENABLED;
- atomic_inc(&netfs->primary_index->parent->usage);
- atomic_inc(&netfs->primary_index->parent->n_children);
-
spin_lock_init(&netfs->primary_index->lock);
INIT_HLIST_HEAD(&netfs->primary_index->backing_objects);
@@ -62,6 +59,9 @@ int __fscache_register_netfs(struct fsca
goto already_registered;
}
+ atomic_inc(&netfs->primary_index->parent->usage);
+ atomic_inc(&netfs->primary_index->parent->n_children);
+
list_add(&netfs->link, &fscache_netfs_list);
ret = 0;
@@ -71,8 +71,7 @@ already_registered:
up_write(&fscache_addremove_sem);
if (ret < 0) {
- netfs->primary_index->parent = NULL;
- __fscache_cookie_put(netfs->primary_index);
+ kmem_cache_free(fscache_cookie_jar, netfs->primary_index);
netfs->primary_index = NULL;
}
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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