sysfs.c
/*
* Copyright (C) 2007 Oracle. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place – Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include
#include «ctree.h» static ssize_t root_blocks_used_show(struct btrfs_root *root, char *buf) static ssize_t root_block_limit_show(struct btrfs_root *root, char *buf) static ssize_t super_blocks_used_show(struct btrfs_fs_info *fs, char *buf) return snprintf(buf, PAGE_SIZE, «%llu\n», static ssize_t super_total_blocks_show(struct btrfs_fs_info *fs, char *buf) static ssize_t super_blocksize_show(struct btrfs_fs_info *fs, char *buf) /* this is for root attrs (subvols/snapshots) */ #define ROOT_ATTR(name, mode, show, store) \ ROOT_ATTR(blocks_used, 0444, root_blocks_used_show, NULL); static struct attribute *btrfs_root_attrs[] = { /* this is for super attrs (actual full fs) */ #define SUPER_ATTR(name, mode, show, store) \ SUPER_ATTR(blocks_used, 0444, super_blocks_used_show, NULL); static struct attribute *btrfs_super_attrs[] = { static ssize_t btrfs_super_attr_show(struct kobject *kobj, return a->show ? a->show(fs, buf) : 0; static ssize_t btrfs_super_attr_store(struct kobject *kobj, return a->store ? a->store(fs, buf, len) : 0; static ssize_t btrfs_root_attr_show(struct kobject *kobj, return a->show ? a->show(root, buf) : 0; static ssize_t btrfs_root_attr_store(struct kobject *kobj, static void btrfs_super_release(struct kobject *kobj) static void btrfs_root_release(struct kobject *kobj) static struct sysfs_ops btrfs_super_attr_ops = { static struct sysfs_ops btrfs_root_attr_ops = { static struct kobj_type btrfs_root_ktype = { static struct kobj_type btrfs_super_ktype = { /* /sys/fs/btrfs/ entry */ int btrfs_sysfs_add_super(struct btrfs_fs_info *fs) name = kmalloc(len, GFP_NOFS); for (i = 0; i < len; i++) { fs->super_kobj.kset = btrfs_kset; return 0; fail: int btrfs_sysfs_add_root(struct btrfs_root *root) error = kobject_init_and_add(&root->root_kobj, &btrfs_root_ktype, return 0; fail: void btrfs_sysfs_del_root(struct btrfs_root *root) void btrfs_sysfs_del_super(struct btrfs_fs_info *fs) int btrfs_init_sysfs(void) void btrfs_exit_sysfs(void)
#include «disk-io.h»
#include «transaction.h»
{
return snprintf(buf, PAGE_SIZE, «%llu\n»,
(unsigned long long)btrfs_root_used(&root->root_item));
}
{
return snprintf(buf, PAGE_SIZE, «%llu\n»,
(unsigned long long)btrfs_root_limit(&root->root_item));
}
{
(unsigned long long)btrfs_super_bytes_used(&fs->super_copy));
}
{
return snprintf(buf, PAGE_SIZE, «%llu\n»,
(unsigned long long)btrfs_super_total_bytes(&fs->super_copy));
}
{
return snprintf(buf, PAGE_SIZE, «%llu\n»,
(unsigned long long)btrfs_super_sectorsize(&fs->super_copy));
}
struct btrfs_root_attr {
struct attribute attr;
ssize_t (*show)(struct btrfs_root *, char *);
ssize_t (*store)(struct btrfs_root *, const char *, size_t);
};
static struct btrfs_root_attr btrfs_root_attr_##name = __ATTR(name, mode, \
show, store)
ROOT_ATTR(block_limit, 0644, root_block_limit_show, NULL);
&btrfs_root_attr_blocks_used.attr,
&btrfs_root_attr_block_limit.attr,
NULL,
};
struct btrfs_super_attr {
struct attribute attr;
ssize_t (*show)(struct btrfs_fs_info *, char *);
ssize_t (*store)(struct btrfs_fs_info *, const char *, size_t);
};
static struct btrfs_super_attr btrfs_super_attr_##name = __ATTR(name, mode, \
show, store)
SUPER_ATTR(total_blocks, 0444, super_total_blocks_show, NULL);
SUPER_ATTR(blocksize, 0444, super_blocksize_show, NULL);
&btrfs_super_attr_blocks_used.attr,
&btrfs_super_attr_total_blocks.attr,
&btrfs_super_attr_blocksize.attr,
NULL,
};
struct attribute *attr, char *buf)
{
struct btrfs_fs_info *fs = container_of(kobj, struct btrfs_fs_info,
super_kobj);
struct btrfs_super_attr *a = container_of(attr,
struct btrfs_super_attr,
attr);
}
struct attribute *attr,
const char *buf, size_t len)
{
struct btrfs_fs_info *fs = container_of(kobj, struct btrfs_fs_info,
super_kobj);
struct btrfs_super_attr *a = container_of(attr,
struct btrfs_super_attr,
attr);
}
struct attribute *attr, char *buf)
{
struct btrfs_root *root = container_of(kobj, struct btrfs_root,
root_kobj);
struct btrfs_root_attr *a = container_of(attr,
struct btrfs_root_attr,
attr);
}
struct attribute *attr,
const char *buf, size_t len)
{
struct btrfs_root *root = container_of(kobj, struct btrfs_root,
root_kobj);
struct btrfs_root_attr *a = container_of(attr,
struct btrfs_root_attr,
attr);
return a->store ? a->store(root, buf, len) : 0;
}
{
struct btrfs_fs_info *fs = container_of(kobj, struct btrfs_fs_info,
super_kobj);
complete(&fs->kobj_unregister);
}
{
struct btrfs_root *root = container_of(kobj, struct btrfs_root,
root_kobj);
complete(&root->kobj_unregister);
}
.show = btrfs_super_attr_show,
.store = btrfs_super_attr_store,
};
.show = btrfs_root_attr_show,
.store = btrfs_root_attr_store,
};
.default_attrs = btrfs_root_attrs,
.sysfs_ops = &btrfs_root_attr_ops,
.release = btrfs_root_release,
};
.default_attrs = btrfs_super_attrs,
.sysfs_ops = &btrfs_super_attr_ops,
.release = btrfs_super_release,
};
static struct kset *btrfs_kset;
{
int error;
char *name;
char c;
int len = strlen(fs->sb->s_id) + 1;
int i;
if (!name) {
error = -ENOMEM;
goto fail;
}
c = fs->sb->s_id[i];
if (c == ‘/’ || c == ‘\\’)
c = ‘!’;
name[i] = c;
}
name[len] = ‘\0′;
error = kobject_init_and_add(&fs->super_kobj, &btrfs_super_ktype,
NULL, «%s», name);
kfree(name);
if (error)
goto fail;
printk(KERN_ERR «btrfs: sysfs creation for super failed\n»);
return error;
}
{
int error;
&root->fs_info->super_kobj,
«%s», root->name);
if (error)
goto fail;
printk(KERN_ERR «btrfs: sysfs creation for root failed\n»);
return error;
}
{
kobject_put(&root->root_kobj);
wait_for_completion(&root->kobj_unregister);
}
{
kobject_put(&fs->super_kobj);
wait_for_completion(&fs->kobj_unregister);
}
{
btrfs_kset = kset_create_and_add(»btrfs», NULL, fs_kobj);
if (!btrfs_kset)
return -ENOMEM;
return 0;
}
{
kset_unregister(btrfs_kset);
}