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9p: fix /sys/fs/9p/caches overwriting itself

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[ Upstream commit 86db0c32f1 ]

caches_show() overwrote its buffer on each iteration,
so only the last cache tag was visible in sysfs output.

Properly append with snprintf(buf + count, …).

Signed-off-by: Randall P. Embry <rpembry@gmail.com>
Message-ID: <20250926-v9fs_misc-v1-2-a8b3907fc04d@codewreck.org>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Randall P. Embry
2025-11-24 10:29:48 +01:00
committed by Greg Kroah-Hartman
parent 0ab9ef66a8
commit cdd2b67dec
1 changed files with 1 additions and 1 deletions
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fs/9p/v9fs.c
+1 -1
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@@ -561,7 +561,7 @@ static ssize_t caches_show(struct kobject *kobj,
spin_lock(&v9fs_sessionlist_lock);
list_for_each_entry(v9ses, &v9fs_sessionlist, slist) {
if (v9ses->cachetag) {
n = snprintf(buf, limit, "%s\n", v9ses->cachetag);
n = snprintf(buf + count, limit, "%s\n", v9ses->cachetag);
if (n < 0) {
count = n;
break;