Commit 108aa35d authored by Li Lingfeng's avatar Li Lingfeng
Browse files

block: Expand the meaning of bdev_allow_write_mounted 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8S3GW


CVE: NA

---------------------------

For bdev_allow_write_mounted, there will be more subdivided scenarios and
different bits of it will be used to indicate different scenarios, so
expand it now.

Signed-off-by: default avatarLi Lingfeng <lilingfeng3@huawei.com>
parent 06d779b8

block/bdev.c

+7 −3
Original line number Diff line number Diff line
@@ -30,8 +30,12 @@ 
#include "../fs/internal.h"

#include "blk.h"



#define bdev_write_mounted_opt(opt) (bdev_allow_write_mounted & (1 << BLKDEV_##opt))

/* Should we allow writing to mounted block devices? */

static bool bdev_allow_write_mounted = IS_ENABLED(CONFIG_BLK_DEV_WRITE_MOUNTED);

#define BLKDEV_ALLOW_WRITE_MOUNTED	0



static u8 bdev_allow_write_mounted =

	IS_ENABLED(CONFIG_BLK_DEV_WRITE_MOUNTED) << BLKDEV_ALLOW_WRITE_MOUNTED;



struct bdev_inode {

	struct block_device bdev;
@@ -755,7 +759,7 @@ static bool bdev_mount_blocked(struct block_device *bdev) 


static bool bdev_may_open(struct block_device *bdev, blk_mode_t mode)

{

	if (bdev_allow_write_mounted)

	if (bdev_write_mounted_opt(ALLOW_WRITE_MOUNTED))

		return true;

	/* Writes blocked? */

	if (mode & BLK_OPEN_WRITE && bdev_writes_blocked(bdev))
@@ -1134,7 +1138,7 @@ void bdev_statx_dioalign(struct inode *inode, struct kstat *stat) 


static int __init setup_bdev_allow_write_mounted(char *str)

{

	if (kstrtobool(str, &bdev_allow_write_mounted))

	if (kstrtou8(str, 0, &bdev_allow_write_mounted))

		pr_warn("Invalid option string for bdev_allow_write_mounted:"

			" '%s'\n", str);

	return 1;