path: root/fs/aio.c
diff options
authorBenjamin LaHaise <bcrl@kvack.org>2013-05-24 15:55:38 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-05-24 16:22:53 -0700
commit03e04f048d2774aabd126fbad84729d4ba9dc40a (patch)
treee6f493171d0f91febdf2fe45366d805a5c2e2147 /fs/aio.c
parenta9ff785e4437c83d2179161e012f5bdfbd6381f0 (diff)
aio: fix kioctx not being freed after cancellation at exit time
The recent changes overhauling fs/aio.c introduced a bug that results in the kioctx not being freed when outstanding kiocbs are cancelled at exit_aio() time. Specifically, a kiocb that is cancelled has its completion events discarded by batch_complete_aio(), which then fails to wake up the process stuck in free_ioctx(). Fix this by modifying the wait_event() condition in free_ioctx() appropriately. This patch was tested with the cancel operation in the thread based code posted yesterday. [akpm@linux-foundation.org: fix build] Signed-off-by: Benjamin LaHaise <bcrl@kvack.org> Signed-off-by: Kent Overstreet <koverstreet@google.com> Cc: Kent Overstreet <koverstreet@google.com> Cc: Josh Boyer <jwboyer@redhat.com> Cc: Zach Brown <zab@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/aio.c')
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/aio.c b/fs/aio.c
index 3fcdd73b6f1b..7fe5bdee1630 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -307,7 +307,9 @@ static void free_ioctx(struct kioctx *ctx)
while (atomic_read(&ctx->reqs_active) > 0) {
- wait_event(ctx->wait, head != ctx->tail);
+ wait_event(ctx->wait,
+ head != ctx->tail ||
+ atomic_read(&ctx->reqs_active) <= 0);
avail = (head <= ctx->tail ? ctx->tail : ctx->nr_events) - head;