Hi Chengguang,
On 2018/9/18 23:10, Chengguang Xu wrote:
> Add option validation in remount. After this patch, remount
> can change recognized options, and for unknown options remount
> will fail and report error.
>
> Signed-off-by: Chengguang Xu <cgxu...@gmx.com>
> Reviewed-by: Chao Yu <yuch...@huawei.com>
> ---
> drivers/staging/erofs/super.c | 38 ++++++++++++++++++++++++++++-------
> 1 file changed, 31 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/staging/erofs/super.c b/drivers/staging/erofs/super.c
> index a091b93190e1..30b6b44dc6c4 100644
> --- a/drivers/staging/erofs/super.c
> +++ b/drivers/staging/erofs/super.c
> @@ -145,14 +145,10 @@ char *erofs_fault_name[FAULT_MAX] = {
> [FAULT_KMALLOC] = "kmalloc",
> };
>
> -static int erofs_build_fault_attr(struct erofs_sb_info *sbi,
> - substring_t *args)
> +static void __erofs_build_fault_attr(struct erofs_sb_info *sbi,
> + unsigned int rate)
> {
> struct erofs_fault_info *ffi = &sbi->fault_info;
> - int rate = 0;
> -
> - if (args->from && match_int(args, &rate))
> - return -EINVAL;
>
> if (rate) {
> atomic_set(&ffi->inject_ops, 0);
> @@ -163,14 +159,29 @@ static int erofs_build_fault_attr(struct erofs_sb_info
> *sbi,
> }
>
> set_opt(sbi, FAULT_INJECTION);
> - return 0;
> }
>
> static unsigned int erofs_get_fault_rate(struct erofs_sb_info *sbi)
> {
> return sbi->fault_info.inject_rate;
> }
> +
> +static int erofs_build_fault_attr(struct erofs_sb_info *sbi, substring_t
> *args)
> +{
> + int rate = 0;
> +
> + if (args->from && match_int(args, &rate))
> + return -EINVAL;
> +
> + __erofs_build_fault_attr(sbi, rate);
> + return 0;
> +}
> #else
> +static void __erofs_build_fault_attr(struct erofs_sb_info *sbi,
> + unsigned int rate)
> +{
> +}
> +
> static int erofs_build_fault_attr(struct erofs_sb_info *sbi,
> substring_t *args)
> {
> @@ -644,10 +655,23 @@ static int erofs_show_options(struct seq_file *seq,
> struct dentry *root)
>
> static int erofs_remount(struct super_block *sb, int *flags, char *data)
> {
> + struct erofs_sb_info *sbi = EROFS_SB(sb);
> + unsigned int org_mnt_opt = sbi->mount_opt;
> + unsigned int org_inject_rate = erofs_get_fault_rate(sbi);
> + int err;
> +
> BUG_ON(!sb_rdonly(sb));
> + err = parse_options(sb, data);
> + if (err)
> + goto out;
>
> *flags |= MS_RDONLY;
I cannot apply this patch since the above line has been changed in
5f0abea6ab6d("staging: erofs: rename superblock flags (MS_xyz -> SB_xyz)").
And two more checkpatch CHECKs as [PATCH v3 2/4]
CHECK: Alignment should match open parenthesis
#141: FILE: drivers/staging/erofs/super.c:149:
+static void __erofs_build_fault_attr(struct erofs_sb_info *sbi,
+ unsigned int rate)
CHECK: Alignment should match open parenthesis
#175: FILE: drivers/staging/erofs/super.c:181:
+static void __erofs_build_fault_attr(struct erofs_sb_info *sbi,
+ unsigned int rate)
And I think I need to test the basic erofs remount function tomorrow
before merging... it is too late and I have to go to sleep now...
Thanks,
Gao Xiang
> return 0;
> +out:
> + __erofs_build_fault_attr(sbi, org_inject_rate);
> + sbi->mount_opt = org_mnt_opt;
> +
> + return err;
> }
>
> const struct super_operations erofs_sops = {
>
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