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9p: fix cache/debug options printing in v9fs_show_options 

commit 4eb3117888 changed the cache= option to accept either string
shortcuts or bitfield values. It also changed /proc/mounts to emit the
option as the hexadecimal numeric value rather than the shortcut string.

However, by printing "cache=%x" without the leading 0x, shortcuts such
as "cache=loose" will emit "cache=f" and 'f' is not a string that is
parseable by kstrtoint(), so remounting may fail if a remount with
"cache=f" is attempted.

debug=%x has had the same problem since options have been displayed in
c4fac91004 ("9p: Implement show_options")

Fix these by adding the 0x prefix to the hexadecimal value shown in
/proc/mounts.

Fixes: 4eb3117888 ("fs/9p: Rework cache modes and add new options to Documentation")
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Message-ID: <54b93378-dcf1-4b04-922d-c8b4393da299@redhat.com>
[Dominique: use %#x at Al Viro's suggestion, also handle debug]
Tested-by: Remi Pommarel <repk@triplefau.lt>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
pull/1354/merge
Eric Sandeen 2025-12-02 16:30:53 -06:00 committed by Dominique Martinet
parent 1f3e4142c0
commit f044561331
1 changed files with 2 additions and 2 deletions
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4
fs/9p/v9fs.c
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@ -132,7 +132,7 @@ int v9fs_show_options(struct seq_file *m, struct dentry *root)
struct v9fs_session_info *v9ses = root->d_sb->s_fs_info;
if (v9ses->debug)
seq_printf(m, ",debug=%x", v9ses->debug);
seq_printf(m, ",debug=%#x", v9ses->debug);
if (!uid_eq(v9ses->dfltuid, V9FS_DEFUID))
seq_printf(m, ",dfltuid=%u",
from_kuid_munged(&init_user_ns, v9ses->dfltuid));
@ -148,7 +148,7 @@ int v9fs_show_options(struct seq_file *m, struct dentry *root)
if (v9ses->nodev)
seq_puts(m, ",nodevmap");
if (v9ses->cache)
seq_printf(m, ",cache=%x", v9ses->cache);
seq_printf(m, ",cache=%#x", v9ses->cache);
#ifdef CONFIG_9P_FSCACHE
if (v9ses->cachetag && (v9ses->cache & CACHE_FSCACHE))
seq_printf(m, ",cachetag=%s", v9ses->cachetag);