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erofs: add GFP_NOIO in the bio completion if needed 

The bio completion path in the process context (e.g. dm-verity)
will directly call into decompression rather than trigger another
workqueue context for minimal scheduling latencies, which can
then call vm_map_ram() with GFP_KERNEL.

Due to insufficient memory, vm_map_ram() may generate memory
swapping I/O, which can cause submit_bio_wait to deadlock
in some scenarios.

Trimmed down the call stack, as follows:

f2fs_submit_read_io
  submit_bio                      //bio_list is initialized.
    mmc_blk_mq_recovery
      z_erofs_endio
        vm_map_ram
          __pte_alloc_kernel
            __alloc_pages_direct_reclaim
              shrink_folio_list
                __swap_writepage
                  submit_bio_wait  //bio_list is non-NULL, hang!!!

Use memalloc_noio_{save,restore}() to wrap up this path.

Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: Jiucheng Xu <jiucheng.xu@amlogic.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Jiucheng Xu 2026-03-11 17:11:31 +08:00 committed by Gao Xiang
parent eade540403
commit c23df30915
1 changed files with 3 additions and 0 deletions
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3
fs/erofs/zdata.c
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@ -1445,6 +1445,7 @@ static void z_erofs_decompress_kickoff(struct z_erofs_decompressqueue *io,
int bios)
{
struct erofs_sb_info *const sbi = EROFS_SB(io->sb);
int gfp_flag;
/* wake up the caller thread for sync decompression */
if (io->sync) {
@ -1477,7 +1478,9 @@ static void z_erofs_decompress_kickoff(struct z_erofs_decompressqueue *io,
sbi->sync_decompress = EROFS_SYNC_DECOMPRESS_FORCE_ON;
return;
}
gfp_flag = memalloc_noio_save();
z_erofs_decompressqueue_work(&io->u.work);
memalloc_noio_restore(gfp_flag);
}
static void z_erofs_fill_bio_vec(struct bio_vec *bvec,