From: Dongbo Cao <cdbdyx@163.com>
To: colyli@suse.de
Cc: kent.overstreet@gmail.com, linux-bcache@vger.kernel.org,
linux-kernel@vger.kernel.org, Dongbo Cao <cdbdyx@163.com>
Subject: [PATCH] add label interface for cache device in sysfs
Date: Fri, 14 Sep 2018 17:51:20 +0800 [thread overview]
Message-ID: <20180914095120.2699-1-cdbdyx@163.com> (raw)
label interface will be called by bcache tools in user space.
Signed-off-by: Dongbo Cao <cdbdyx@163.com>
---
drivers/md/bcache/sysfs.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index 225b15aa..e64c718f 100644
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -950,6 +950,13 @@ SHOW(__bch_cache)
return ret;
}
+ if (attr == &sysfs_label) {
+ memcpy(buf, ca->sb.label, SB_LABEL_SIZE);
+ buf[SB_LABEL_SIZE + 1] = '\0';
+ strcat(buf, "\n");
+ return strlen(buf);
+ }
+
return 0;
}
SHOW_LOCKED(bch_cache)
@@ -993,6 +1000,17 @@ STORE(__bch_cache)
atomic_set(&ca->io_errors, 0);
}
+ if (attr == &sysfs_label) {
+ if (size > SB_LABEL_SIZE)
+ return -EINVAL;
+ memcpy(ca->sb.label, buf, size);
+ if (size < SB_LABEL_SIZE)
+ ca->sb.label[size] = '\0';
+ if (size && ca->sb.label[size - 1] == '\n')
+ ca->sb.label[size - 1] = '\0';
+ bcache_write_super(ca->set);
+ }
+
return size;
}
STORE_LOCKED(bch_cache)
@@ -1009,6 +1027,7 @@ static struct attribute *bch_cache_files[] = {
&sysfs_io_errors,
&sysfs_clear_stats,
&sysfs_cache_replacement_policy,
+ &sysfs_label,
NULL
};
KTYPE(bch_cache);
--
2.17.1
next reply other threads:[~2018-09-14 9:51 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-14 9:51 Dongbo Cao [this message]
2018-09-14 10:00 ` [PATCH] add label interface for cache device in sysfs Coly Li
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180914095120.2699-1-cdbdyx@163.com \
--to=cdbdyx@163.com \
--cc=colyli@suse.de \
--cc=kent.overstreet@gmail.com \
--cc=linux-bcache@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).