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UPSTREAM: erofs: use workqueue decompression for atomic contexts only

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z_erofs_decompressqueue_endio may not be executed in the atomic
context, for example, when dm-verity is turned on. In this scenario,
data can be decompressed directly to get rid of additional kworker
scheduling overhead.

Link: https://lore.kernel.org/r/20210317035448.13921-2-huangjianan@oppo.com
Reviewed-by: Gao Xiang <hsiangkao@redhat.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Huang Jianan <huangjianan@oppo.com>
Signed-off-by: Guo Weichao <guoweichao@oppo.com>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>

Bug: 190585249
Change-Id: I369268e398ce8b16362ace2e6a03a5061caebd90
(cherry picked from commit 648f2de053)
Signed-off-by: Huang Jianan <huangjianan@oppo.com>
This commit is contained in:
Huang Jianan 2021-03-17 11:54:47 +08:00 • committed by Greg Kroah-Hartman
commit 0ca4eafb39
1 changed files with 8 additions and 1 deletions
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9
fs/erofs/zdata.c
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@ -709,6 +709,7 @@ err_out:
goto out;
}
static void z_erofs_decompressqueue_work(struct work_struct *work);
static void z_erofs_decompress_kickoff(struct z_erofs_decompressqueue *io,
bool sync, int bios)
{
@ -723,8 +724,14 @@ static void z_erofs_decompress_kickoff(struct z_erofs_decompressqueue *io,
return;
}
if (!atomic_add_return(bios, &io->pending_bios))
if (atomic_add_return(bios, &io->pending_bios))
return;
/* Use workqueue decompression for atomic contexts only */
if (in_atomic() || irqs_disabled()) {
queue_work(z_erofs_workqueue, &io->u.work);
return;
}
z_erofs_decompressqueue_work(&io->u.work);
}
static bool z_erofs_page_is_invalidated(struct page *page)