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exfat: call sync_filesystem for read-only remount

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We need to commit dirty metadata and pages to disk
before remounting exfat as read-only.

This fixes a failure in xfstests generic/452

generic/452 does the following:
cp something <exfat>/
mount -o remount,ro <exfat>

the <exfat>/something is corrupted. because while
exfat is remounted as read-only, exfat doesn't
have a chance to commit metadata and
vfs invalidates page caches in a block device.

Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com>
Acked-by: Sungjong Seo <sj1557.seo@samsung.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
This commit is contained in:
Hyunchul Lee 2020-06-16 14:34:45 +09:00 committed by Namjae Jeon
parent e8dd3cda86
commit a0271a15cf
1 changed files with 10 additions and 0 deletions
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10
fs/exfat/super.c
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@ -693,10 +693,20 @@ static void exfat_free(struct fs_context *fc)
}
}
static int exfat_reconfigure(struct fs_context *fc)
{
fc->sb_flags |= SB_NODIRATIME;
/* volume flag will be updated in exfat_sync_fs */
sync_filesystem(fc->root->d_sb);
return 0;
}
static const struct fs_context_operations exfat_context_ops = {
.parse_param = exfat_parse_param,
.get_tree = exfat_get_tree,
.free = exfat_free,
.reconfigure = exfat_reconfigure,
};
static int exfat_init_fs_context(struct fs_context *fc)