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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 15:09:55 +09:00 • committed by Namjae Jeon
commit c5a2c1ed8b
1 changed files with 23 additions and 0 deletions
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23
super.c
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@ -207,6 +207,18 @@ static void exfat_destroy_inode(struct inode *inode)
{
call_rcu(&inode->i_rcu, exfat_i_callback);
}
static int exfat_remount(struct super_block *sb, int *flags, char *data)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
*flags |= SB_NODIRATIME;
#else
*flags |= MS_NODIRATIME;
#endif
sync_filesystem(sb);
return 0;
}
#endif
static const struct super_operations exfat_sops = {
@ -215,6 +227,7 @@ static const struct super_operations exfat_sops = {
.free_inode = exfat_free_inode,
#else
.destroy_inode = exfat_destroy_inode,
.remount_fs = exfat_remount,
#endif
.write_inode = exfat_write_inode,
.evict_inode = exfat_evict_inode,
@ -963,10 +976,20 @@ static void exfat_free(struct fs_context *fc)
kfree(fc->s_fs_info);
}
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)