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bcache: export backing_dev_name via sysfs

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This patch export dc->backing_dev_name to sysfs file
/sys/block/bcache<?>/bcache/backing_dev_name, then people or user space
tools may know the backing device name of this bcache device.

Of cause it can be done by parsing sysfs links, but this method can be
much simpler to find the link between bcache device and backing device.

Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Coly Li 2019-02-09 12:52:55 +08:00 committed by Jens Axboe
parent 83ff9318c4
commit 926d19465b
1 changed files with 8 additions and 0 deletions
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8
drivers/md/bcache/sysfs.c
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@ -67,6 +67,7 @@ read_attribute(written);
read_attribute(btree_written);
read_attribute(metadata_written);
read_attribute(active_journal_entries);
read_attribute(backing_dev_name);
sysfs_time_stats_attribute(btree_gc, sec, ms);
sysfs_time_stats_attribute(btree_split, sec, us);
@ -243,6 +244,12 @@ SHOW(__bch_cached_dev)
return strlen(buf);
}
if (attr == &sysfs_backing_dev_name) {
snprintf(buf, BDEVNAME_SIZE + 1, "%s", dc->backing_dev_name);
strcat(buf, "\n");
return strlen(buf);
}
#undef var
return 0;
}
@ -452,6 +459,7 @@ static struct attribute *bch_cached_dev_files[] = {
&sysfs_verify,
&sysfs_bypass_torture_test,
#endif
&sysfs_backing_dev_name,
NULL
};
KTYPE(bch_cached_dev);