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dm dust: add interface to list all badblocks 

This interface may help anyone who want to know all badblocks without
querying for each block.

[Bryan: DMEMIT message if no blocks are in the bad block list.]

Signed-off-by: yangerkun <yangerkun@huawei.com>
Signed-off-by: Bryan Gurney <bgurney@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
yangerkun 2020-06-19 17:12:42 -04:00 committed by Mike Snitzer
parent 4f7f590b15
commit 0c248ea27f
2 changed files with 44 additions and 0 deletions
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17
Documentation/admin-guide/device-mapper/dm-dust.rst
View File

@ -206,6 +206,22 @@ appear::
dust_clear_badblocks: no badblocks found
Listing the bad block list
--------------------------
To list all bad blocks in the bad block list (using an example device
with blocks 1 and 2 in the bad block list), run the following message
command::
$ sudo dmsetup message dust1 0 listbadblocks
1
2
If there are no bad blocks in the bad block list, the command will
execute with no output::
$ sudo dmsetup message dust1 0 listbadblocks
Message commands list
---------------------
@ -224,6 +240,7 @@ Single argument message commands::
countbadblocks
clearbadblocks
listbadblocks
disable
enable
quiet

27
drivers/md/dm-dust.c
View File

@ -284,6 +284,31 @@ static int dust_clear_badblocks(struct dust_device *dd, char *result, unsigned i
return 1;
}
static int dust_list_badblocks(struct dust_device *dd, char *result, unsigned int maxlen,
unsigned int *sz_ptr)
{
unsigned long flags;
struct rb_root badblocklist;
struct rb_node *node;
struct badblock *bblk;
unsigned int sz = *sz_ptr;
unsigned long long num = 0;
spin_lock_irqsave(&dd->dust_lock, flags);
badblocklist = dd->badblocklist;
for (node = rb_first(&badblocklist); node; node = rb_next(node)) {
bblk = rb_entry(node, struct badblock, node);
DMEMIT("%llu\n", bblk->bb);
num++;
}
spin_unlock_irqrestore(&dd->dust_lock, flags);
if (!num)
DMEMIT("No blocks in badblocklist");
return 1;
}
/*
* Target parameters:
*
@ -427,6 +452,8 @@ static int dust_message(struct dm_target *ti, unsigned int argc, char **argv,
else
dd->quiet_mode = false;
r = 0;
} else if (!strcasecmp(argv[0], "listbadblocks")) {
r = dust_list_badblocks(dd, result, maxlen, &sz);
} else {
invalid_msg = true;
}