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staging/lustre/llite: move root_squash from sysfs to debugfs 

root_squash control got accidentally moved to sysfs instead of
debugfs, and the write side of it was also broken expecting a
userspace buffer.
It contains both uid and gid values in a single file, so debugfs
is a clear place for it.

Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Fixes: c948390f10 "fix inconsistencies of root squash feature"
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oleg Drokin 2016-12-07 17:41:27 -05:00 committed by Greg Kroah-Hartman
parent 2fd2434c3f
commit 4c13990e35
1 changed files with 15 additions and 12 deletions
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27
drivers/staging/lustre/lustre/llite/lproc_llite.c
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@ -924,27 +924,29 @@ static ssize_t ll_unstable_stats_seq_write(struct file *file,
}
LPROC_SEQ_FOPS(ll_unstable_stats);
static ssize_t root_squash_show(struct kobject *kobj, struct attribute *attr,
char *buf)
static int ll_root_squash_seq_show(struct seq_file *m, void *v)
{
struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
ll_kobj);
struct super_block *sb = m->private;
struct ll_sb_info *sbi = ll_s2sbi(sb);
struct root_squash_info *squash = &sbi->ll_squash;
return sprintf(buf, "%u:%u\n", squash->rsi_uid, squash->rsi_gid);
seq_printf(m, "%u:%u\n", squash->rsi_uid, squash->rsi_gid);
return 0;
}
static ssize_t root_squash_store(struct kobject *kobj, struct attribute *attr,
const char *buffer, size_t count)
static ssize_t ll_root_squash_seq_write(struct file *file,
const char __user *buffer,
size_t count, loff_t *off)
{
struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
ll_kobj);
struct seq_file *m = file->private_data;
struct super_block *sb = m->private;
struct ll_sb_info *sbi = ll_s2sbi(sb);
struct root_squash_info *squash = &sbi->ll_squash;
return lprocfs_wr_root_squash(buffer, count, squash,
ll_get_fsname(sbi->ll_sb, NULL, 0));
ll_get_fsname(sb, NULL, 0));
}
LUSTRE_RW_ATTR(root_squash);
LPROC_SEQ_FOPS(ll_root_squash);
static int ll_nosquash_nids_seq_show(struct seq_file *m, void *v)
{
@ -997,6 +999,8 @@ static struct lprocfs_vars lprocfs_llite_obd_vars[] = {
{ "statahead_stats", &ll_statahead_stats_fops, NULL, 0 },
{ "unstable_stats", &ll_unstable_stats_fops, NULL },
{ "sbi_flags", &ll_sbi_flags_fops, NULL, 0 },
{ .name = "root_squash",
.fops = &ll_root_squash_fops },
{ .name = "nosquash_nids",
.fops = &ll_nosquash_nids_fops },
{ NULL }
@ -1027,7 +1031,6 @@ static struct attribute *llite_attrs[] = {
&lustre_attr_max_easize.attr,
&lustre_attr_default_easize.attr,
&lustre_attr_xattr_cache.attr,
&lustre_attr_root_squash.attr,
NULL,
};