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staging: erofs: support IO read error injection

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Used to simulate disk IO read error for testing fatal
error tolerance.

Here are the details,
1) use bio->bi_private to indicate super_block
   for non-compressed bios since some (mainly meta)
   pages can be of the corresponding bdev inode;
2) get super_block dynamically for compressed bios,
   therefore it could not inject bios full of staging
   pages, yet it doesn't affect the normal usage.

Change-Id: I82830edeac0074abf83c3758e0b692b9bd1a96ae
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gao Xiang
2019-03-25 11:40:09 +08:00
committed by Michael Bestas
parent e2ff41e85a
commit c657b5f0e2
1 changed files with 1 additions and 0 deletions
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1
drivers/staging/erofs/Documentation/filesystems/erofs.txt
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@@ -60,6 +60,7 @@ fault_injection=%d Enable fault injection in all supported types with
specified injection rate. Supported injection type:
Type_Name Type_Value
FAULT_KMALLOC 0x000000001
FAULT_READ_IO 0x000000002
(no)user_xattr Setup Extended User Attributes. Note: xattr is enabled
by default if CONFIG_EROFS_FS_XATTR is selected.
(no)acl Setup POSIX Access Control List. Note: acl is enabled