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ovl: sync dirty data when remounting to ro mode

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sync_filesystem() does not sync dirty data for readonly filesystem during
umount, so before changing to readonly filesystem we should sync dirty data
for data integrity.

Signed-off-by: Chengguang Xu <cgxu519@mykernel.net>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Chengguang Xu 2020-04-22 12:28:43 +08:00 committed by Miklos Szeredi
parent c21c839b84
commit 399c109d35
1 changed files with 10 additions and 1 deletions
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11
fs/overlayfs/super.c
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@ -365,11 +365,20 @@ static int ovl_show_options(struct seq_file *m, struct dentry *dentry)
static int ovl_remount(struct super_block *sb, int *flags, char *data) static int ovl_remount(struct super_block *sb, int *flags, char *data)
{ {
struct ovl_fs *ofs = sb->s_fs_info; struct ovl_fs *ofs = sb->s_fs_info;
struct super_block *upper_sb;
int ret = 0;
if (!(*flags & SB_RDONLY) && ovl_force_readonly(ofs)) if (!(*flags & SB_RDONLY) && ovl_force_readonly(ofs))
return -EROFS; return -EROFS;
return 0; if (*flags & SB_RDONLY && !sb_rdonly(sb)) {
upper_sb = ofs->upper_mnt->mnt_sb;
down_read(&upper_sb->s_umount);
ret = sync_filesystem(upper_sb);
up_read(&upper_sb->s_umount);
}
return ret;
} }
static const struct super_operations ovl_super_operations = { static const struct super_operations ovl_super_operations = {