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aio: block exit_aio() until all context requests are completed 

It seems that exit_aio() also needs to wait for all iocbs to complete (like
io_destroy), but we missed the wait step in current implemention, so fix
it in the same way as we did in io_destroy.

Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
Cc: stable@vger.kernel.org
This commit is contained in:
Gu Zheng 2014-09-03 17:45:44 +08:00 committed by Benjamin LaHaise
parent 2ff396be60
commit 6098b45b32
1 changed files with 6 additions and 1 deletions
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7
fs/aio.c
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@ -793,6 +793,8 @@ void exit_aio(struct mm_struct *mm)
for (i = 0; i < table->nr; ++i) {
struct kioctx *ctx = table->table[i];
struct completion requests_done =
COMPLETION_INITIALIZER_ONSTACK(requests_done);
if (!ctx)
continue;
@ -804,7 +806,10 @@ void exit_aio(struct mm_struct *mm)
* that it needs to unmap the area, just set it to 0.
*/
ctx->mmap_size = 0;
kill_ioctx(mm, ctx, NULL);
kill_ioctx(mm, ctx, &requests_done);
/* Wait until all IO for the context are done. */
wait_for_completion(&requests_done);
}
RCU_INIT_POINTER(mm->ioctx_table, NULL);