diff options
| author | Elena Reshetova <elena.reshetova@intel.com> | 2017-03-03 11:55:14 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2017-04-18 15:07:23 +0300 |
| commit | 1e4f4714d59e3fdcde29ee12d40d2e96875a026f (patch) | |
| tree | 1298d39f3b3dae00776bc15a1f6677b0bb32dfaf /fs/btrfs/ctree.h | |
| parent | e76edab7f059bc1047c1865141e2709d70e74852 (diff) | |
| download | linux-1e4f4714d59e3fdcde29ee12d40d2e96875a026f.tar.xz | |
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.h | 3 |
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. */ |