From 8c6a98628318a7775be68bda0d5760817476b397 Mon Sep 17 00:00:00 2001 From: Eric Whitney Date: Thu, 19 Mar 2020 11:00:28 -0400 Subject: [PATCH 1864/2944] ext4: disable dioread_nolock whenever delayed allocation is disabled fix #29455282 commit c8980e1980ccdc2229aa2218d532ddc62e0aabe5 upstream The patch "ext4: make dioread_nolock the default" (244adf6426ee) causes generic/422 to fail when run in kvm-xfstests' ext3conv test case. This applies both the dioread_nolock and nodelalloc mount options, a combination not previously tested by kvm-xfstests. The failure occurs because the dioread_nolock code path splits a previously fallocated multiblock extent into a series of single block extents when overwriting a portion of that extent. That causes allocation of an extent tree leaf node and a reshuffling of extents. Once writeback is completed, the individual extents are recombined into a single extent, the extent is moved again, and the leaf node is deleted. The difference in block utilization before and after writeback due to the leaf node triggers the failure. The original reason for this behavior was to avoid ENOSPC when handling I/O completions during writeback in the dioread_nolock code paths when delayed allocation is disabled. It may no longer be necessary, because code was added in the past to reserve extra space to solve this problem when delayed allocation is enabled, and this code may also apply when delayed allocation is disabled. Until this can be verified, don't use the dioread_nolock code paths if delayed allocation is disabled. Signed-off-by: Eric Whitney Link: https://lore.kernel.org/r/20200319150028.24592-1-enwlinux@gmail.com Signed-off-by: Theodore Ts'o Signed-off-by: Jeffle Xu Reviewed-by: Joseph Qi --- fs/ext4/ext4_jbd2.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h index 402dc36..be8a7db 100644 --- a/fs/ext4/ext4_jbd2.h +++ b/fs/ext4/ext4_jbd2.h @@ -456,6 +456,9 @@ static inline int ext4_should_dioread_nolock(struct inode *inode) return 0; if (ext4_should_journal_data(inode)) return 0; + /* temporary fix to prevent generic/422 test failures */ + if (!test_opt(inode->i_sb, DELALLOC)) + return 0; return 1; } -- 1.8.3.1