linux-kernel - [PATCH-Review] f2fs: Set GF_NOFS in read_cache_page_gfp while doing f2fs_quota

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Date:   Fri, 16 Mar 2018 18:53:52 +0530
From:   Ritesh Harjani <riteshh@...eaurora.org>
To:     jaegeuk@...nel.org, yuchao0@...wei.com,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Cc:     stummala@...eaurora.org, Ritesh Harjani <riteshh@...eaurora.org>
Subject: [PATCH-Review] f2fs: Set GF_NOFS in read_cache_page_gfp while doing f2fs_quota_read

Hello,

Observed below deadlock with quota enabled on f2fs during low memory situation.
I think during f2fs_quota_enable -> which is doing read_cache_page with __GFP_FS
flag set, due to low memory this is causing shrinker to get invoked
and thus going into a deadlock due to mutex lock in dquota. Commit details
in next patch contains the call stack.

Since I did not had the quota enabled on f2fs configuration, I could not test
this on my setup yet.

Could the community kindly review and let me know if the patch
is correct or not ?

Ritesh Harjani (1):
  f2fs: Set GF_NOFS in read_cache_page_gfp while doing f2fs_quota_read

 fs/f2fs/super.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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