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staging: erofs: option validation in remount

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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 <cgxu519@gmx.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Reviewed-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chengguang Xu 2018-09-19 22:53:46 +08:00 committed by Greg Kroah-Hartman
parent 2ab3dd84c0
commit d41076eaeb
1 changed files with 31 additions and 6 deletions
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37
drivers/staging/erofs/super.c
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@ -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);
@ -163,6 +159,17 @@ static int erofs_build_fault_attr(struct erofs_sb_info *sbi,
}
set_opt(sbi, FAULT_INJECTION);
}
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;
}
@ -171,6 +178,11 @@ static unsigned int erofs_get_fault_rate(struct erofs_sb_info *sbi)
return sbi->fault_info.inject_rate;
}
#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)
{
@ -649,10 +661,23 @@ 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 |= SB_RDONLY;
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 = {