!3963 block: Add config to show info about opening a mounted device for write

Merge Pull Request from: @ci-robot 
 
PR sync from: Li Lingfeng <lilingfeng3@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/RBE3JOLJX7IWHDPHI6KGSB54YDINS2AD/ 
v1->v2:
  1) Replace BLK_DEV_DUMPINFO with BLK_DEV_WRITE_MOUNTED_QUIET, which is
     logically opposite;
  2) Make BLK_DEV_WRITE_MOUNTED_QUIET dependent on
     BLK_DEV_WRITE_MOUNTED, and decide whether to set bd_writers
     by BLK_DEV_WRITE_MOUNTED_QUIET;
  3) Move bdev_dump_info() into bdev_may_open();
  4) Add the cmdline interface to control whether to show info;
  5) Pass the state of "writes blocked" to part0 when mounting a
     partition.
v2->v3:
  Add restriction for modifying bd_writers.
v3->v4:
  1) Count bd_writers regardless of whether bdev_allow_write_mounted is
     set;
  2) Expand the meaning of bdev_allow_write_mounted;
  3) Add config option to detect writing to part0 while partitions
     mounted;
  4) Add bd_mounters to record the number of times that part0 or
     partition is mounted;
  5) Show info about opening a lower device for write while upper-layers
     mounted.
v4->v5:
  Move introduction of bd_mounters to patch1.
v5->v6:
  Delete redundant conflict judgment.
v6->v7:
  1) Replace BLK_DEV_WRITE_MOUNTED_QUIET with BLK_DEV_WRITE_MOUNTED_DUMP;
  2) Remove restriction for setting bdev_allow_write_mounted by cmdline.
v7->v8:
  1) Add detection of mounting part0 while partitions write opened;
  2) Add detection of writing partitions while part0 mounted;
  3) Add config in openeuler_defconfig.
v8->v9:
  1) Split bd_mounters into bd_mounted and part_mounters;
  2) Add part_writers;
  3) Count part_writers and part_mounters regardless of whether
     BLK_DEV_DETECT_WRITING_PART0 is set.
v9->v10:
  1) Split the logic of detecting writing lower device from bd_may_open();
  2) Fix the bug of initializing bdev_allow_write_mounted.

Li Lingfeng (6):
  block: Record writing and mounting regardless of whether
    bdev_allow_write_mounted is set
  block: Expand the meaning of bdev_allow_write_mounted
  block: Add config option to detect writing to part0 while partitions
    mounted
  block: Add config option to show info about opening a mounted device
    for write
  block: Show info about opening a lower device for write while
    upper-layers mounted
  add config about writing mounted devices in openeuler_defconfig


-- 
2.31.1
 
https://gitee.com/openeuler/kernel/issues/I8S3GW 
 
Link:https://gitee.com/openeuler/kernel/pulls/3963

 

Reviewed-by: zhangyi (F) <yi.zhang@huawei.com>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>