| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.16 351/357] aio: block exit_aio() until all context requests are completed | Date | Fri, 3 Oct 2014 14:32:17 -0700 |
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3.16-stable review patch. If anyone has any objections, please let me know.
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From: Gu Zheng <guz.fnst@cn.fujitsu.com>
commit 6098b45b32e6baeacc04790773ced9340601d511 upstream.
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> [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
--- fs/aio.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
--- a/fs/aio.c +++ b/fs/aio.c @@ -797,6 +797,9 @@ void exit_aio(struct mm_struct *mm) unsigned i = 0; while (1) { + struct completion requests_done = + COMPLETION_INITIALIZER_ONSTACK(requests_done); + rcu_read_lock(); table = rcu_dereference(mm->ioctx_table); @@ -824,7 +827,10 @@ void exit_aio(struct mm_struct *mm) */ 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); } }
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