36 lines
1.1 KiB
Diff
36 lines
1.1 KiB
Diff
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From 43a498e938887956f393b5e45ea6ac79cc5f4b84 Mon Sep 17 00:00:00 2001
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From: Theodore Ts'o <tytso@mit.edu>
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Date: Thu, 15 Jun 2023 00:17:01 -0400
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Subject: [PATCH] resize2fs: use Direct I/O when reading the superblock for
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online resizes
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If the file system is mounted, the superblock can be changing while
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resize2fs is trying to read the superblock, resulting in checksum
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failures. One way of avoiding this problem is read the superblock
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using Direct I/O, since the kernel makes sure that what gets written
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to disk is self-consistent.
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Suggested-by: Krister Johansen <kjlx@templeofstupid.com>
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Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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Signed-off-by: Pavel Reichl <preichl@redhat.com>
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---
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resize/main.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/resize/main.c b/resize/main.c
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index 94f5ec6d..f914c050 100644
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--- a/resize/main.c
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+++ b/resize/main.c
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@@ -403,6 +403,8 @@
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if (!(mount_flags & EXT2_MF_MOUNTED))
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io_flags = EXT2_FLAG_RW | EXT2_FLAG_EXCLUSIVE;
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+ if (mount_flags & EXT2_MF_MOUNTED)
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+ io_flags |= EXT2_FLAG_DIRECT_IO;
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io_flags |= EXT2_FLAG_64BITS;
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if (undo_file) {
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--
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2.48.1
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