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authorElena Reshetova <elena.reshetova@intel.com>2017-03-03 09:55:14 +0100
committerDavid Sterba <dsterba@suse.com>2017-04-18 14:07:23 +0200
commit1e4f4714d59e3fdcde29ee12d40d2e96875a026f (patch)
tree1298d39f3b3dae00776bc15a1f6677b0bb32dfaf /fs/btrfs/ctree.h
parentbtrfs: convert btrfs_ordered_extent.refs from atomic_t to refcount_t (diff)
downloadlinux-1e4f4714d59e3fdcde29ee12d40d2e96875a026f.tar.xz
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btrfs: convert btrfs_caching_control.count from atomic_t to refcount_t
refcount_t type and corresponding API should be used instead of atomic_t when the variable is used as a reference counter. This allows to avoid accidental refcounter overflows that might lead to use-after-free situations. Signed-off-by: Elena Reshetova <elena.reshetova@intel.com> Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: David Windsor <dwindsor@gmail.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/ctree.h')
-rw-r--r--fs/btrfs/ctree.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index c4115901d906..cdfc2a46448b 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -39,6 +39,7 @@
#include <linux/security.h>
#include <linux/sizes.h>
#include <linux/dynamic_debug.h>
+#include <linux/refcount.h>
#include "extent_io.h"
#include "extent_map.h"
#include "async-thread.h"
@@ -518,7 +519,7 @@ struct btrfs_caching_control {
struct btrfs_work work;
struct btrfs_block_group_cache *block_group;
u64 progress;
- atomic_t count;
+ refcount_t count;
};
/* Once caching_thread() finds this much free space, it will wake up waiters. */