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authorVladimir Zapolskiy <vladimir@tuxera.com>2020-01-02 15:01:18 +0300
committerGao Xiang <gaoxiang25@huawei.com>2020-01-07 05:09:21 +0300
commite3915ad94bfa0e2c1818837af618e9adec74eb1b (patch)
tree473a026f66346451170de0f8f0f636ab9b45d09a /fs/erofs/utils.c
parente5e9a432036a40756db171e7b22ee63e69c41ef1 (diff)
downloadlinux-e3915ad94bfa0e2c1818837af618e9adec74eb1b.tar.xz
erofs: remove void tagging/untagging of workgroup pointers
Because workgroup pointers inserted to a radix tree are always tagged with a single value of 0, it is possible to remove tagging and untagging of the pointers completely. Signed-off-by: Vladimir Zapolskiy <vladimir@tuxera.com> Link: https://lore.kernel.org/r/20200102120118.14979-4-vladimir@tuxera.com Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Diffstat (limited to 'fs/erofs/utils.c')
-rw-r--r--fs/erofs/utils.c9
1 files changed, 2 insertions, 7 deletions
diff --git a/fs/erofs/utils.c b/fs/erofs/utils.c
index 7b47c56b89b7..fddc5059c930 100644
--- a/fs/erofs/utils.c
+++ b/fs/erofs/utils.c
@@ -68,8 +68,6 @@ repeat:
rcu_read_lock();
grp = radix_tree_lookup(&sbi->workstn_tree, index);
if (grp) {
- grp = xa_untag_pointer(grp);
-
if (erofs_workgroup_get(grp)) {
/* prefer to relax rcu read side */
rcu_read_unlock();
@@ -101,8 +99,6 @@ int erofs_register_workgroup(struct super_block *sb,
sbi = EROFS_SB(sb);
xa_lock(&sbi->workstn_tree);
- grp = xa_tag_pointer(grp, 0);
-
/*
* Bump up reference count before making this workgroup
* visible to other users in order to avoid potential UAF
@@ -173,8 +169,7 @@ static bool erofs_try_to_release_workgroup(struct erofs_sb_info *sbi,
* however in order to avoid some race conditions, add a
* DBG_BUGON to observe this in advance.
*/
- DBG_BUGON(xa_untag_pointer(radix_tree_delete(&sbi->workstn_tree,
- grp->index)) != grp);
+ DBG_BUGON(radix_tree_delete(&sbi->workstn_tree, grp->index) != grp);
/*
* If managed cache is on, last refcount should indicate
@@ -199,7 +194,7 @@ repeat:
batch, first_index, PAGEVEC_SIZE);
for (i = 0; i < found; ++i) {
- struct erofs_workgroup *grp = xa_untag_pointer(batch[i]);
+ struct erofs_workgroup *grp = batch[i];
first_index = grp->index + 1;