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authorLinus Torvalds <torvalds@linux-foundation.org>2021-11-27 10:27:35 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2021-11-27 10:27:35 -0800
commit52dc4c640ac5521cc95b3b87f9d2d276c12c07bb (patch)
treec91d85b793652b26057489ca94d98000ad8ff828
parent7b65b798a604aff77d5e744833b5d452d2081467 (diff)
parent57bbeacdbee72a54eb97d56b876cf9c94059fc34 (diff)
Merge tag 'erofs-for-5.16-rc3-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs
Pull erofs fix from Gao Xiang: "Fix an ABBA deadlock introduced by XArray conversion" * tag 'erofs-for-5.16-rc3-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs: erofs: fix deadlock when shrink erofs slab
-rw-r--r--fs/erofs/utils.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/erofs/utils.c b/fs/erofs/utils.c
index 84da2c280012..ec9a1d780dc1 100644
--- a/fs/erofs/utils.c
+++ b/fs/erofs/utils.c
@@ -150,7 +150,7 @@ 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_erase(&sbi->managed_pslots, grp->index) != grp);
+ DBG_BUGON(__xa_erase(&sbi->managed_pslots, grp->index) != grp);
/* last refcount should be connected with its managed pslot. */
erofs_workgroup_unfreeze(grp, 0);
@@ -165,15 +165,19 @@ static unsigned long erofs_shrink_workstation(struct erofs_sb_info *sbi,
unsigned int freed = 0;
unsigned long index;
+ xa_lock(&sbi->managed_pslots);
xa_for_each(&sbi->managed_pslots, index, grp) {
/* try to shrink each valid workgroup */
if (!erofs_try_to_release_workgroup(sbi, grp))
continue;
+ xa_unlock(&sbi->managed_pslots);
++freed;
if (!--nr_shrink)
- break;
+ return freed;
+ xa_lock(&sbi->managed_pslots);
}
+ xa_unlock(&sbi->managed_pslots);
return freed;
}