Btrfs: Add per-root block accounting and sysfs entries
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Josef Bacik
committed by
David Woodhouse
David Woodhouse
parent
b888db2bd7
commit
58176a9604
236
fs/btrfs/sysfs.c
236
fs/btrfs/sysfs.c
@ -16,6 +16,242 @@
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/module.h>
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#include <linux/kobject.h>
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#include "ctree.h"
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#include "disk-io.h"
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#include "transaction.h"
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static ssize_t root_blocks_used_show(struct btrfs_root *root, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%llu\n",
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(unsigned long long)btrfs_root_blocks_used(&root->root_item));
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}
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static ssize_t root_block_limit_show(struct btrfs_root *root, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%llu\n",
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(unsigned long long)btrfs_root_block_limit(&root->root_item));
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}
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static ssize_t super_blocks_used_show(struct btrfs_fs_info *fs, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%llu\n",
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(unsigned long long)btrfs_super_blocks_used(fs->disk_super));
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}
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static ssize_t super_total_blocks_show(struct btrfs_fs_info *fs, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%llu\n",
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(unsigned long long)btrfs_super_total_blocks(fs->disk_super));
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}
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static ssize_t super_blocksize_show(struct btrfs_fs_info *fs, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%llu\n",
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(unsigned long long)btrfs_super_blocksize(fs->disk_super));
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}
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/* this is for root attrs (subvols/snapshots) */
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struct btrfs_root_attr {
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struct attribute attr;
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ssize_t (*show)(struct btrfs_root *, char *);
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ssize_t (*store)(struct btrfs_root *, const char *, size_t);
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};
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#define ROOT_ATTR(name, mode, show, store) \
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static struct btrfs_root_attr btrfs_root_attr_##name = __ATTR(name, mode, show, store)
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ROOT_ATTR(blocks_used, 0444, root_blocks_used_show, NULL);
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ROOT_ATTR(block_limit, 0644, root_block_limit_show, NULL);
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static struct attribute *btrfs_root_attrs[] = {
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&btrfs_root_attr_blocks_used.attr,
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&btrfs_root_attr_block_limit.attr,
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NULL,
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};
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/* this is for super attrs (actual full fs) */
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struct btrfs_super_attr {
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struct attribute attr;
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ssize_t (*show)(struct btrfs_fs_info *, char *);
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ssize_t (*store)(struct btrfs_fs_info *, const char *, size_t);
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};
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#define SUPER_ATTR(name, mode, show, store) \
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static struct btrfs_super_attr btrfs_super_attr_##name = __ATTR(name, mode, show, store)
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SUPER_ATTR(blocks_used, 0444, super_blocks_used_show, NULL);
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SUPER_ATTR(total_blocks, 0444, super_total_blocks_show, NULL);
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SUPER_ATTR(blocksize, 0444, super_blocksize_show, NULL);
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static struct attribute *btrfs_super_attrs[] = {
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&btrfs_super_attr_blocks_used.attr,
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&btrfs_super_attr_total_blocks.attr,
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&btrfs_super_attr_blocksize.attr,
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NULL,
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};
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static ssize_t btrfs_super_attr_show(struct kobject *kobj,
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struct attribute *attr, char *buf)
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{
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struct btrfs_fs_info *fs = container_of(kobj, struct btrfs_fs_info,
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super_kobj);
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struct btrfs_super_attr *a = container_of(attr,
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struct btrfs_super_attr,
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attr);
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return a->show ? a->show(fs, buf) : 0;
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}
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static ssize_t btrfs_super_attr_store(struct kobject *kobj,
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struct attribute *attr,
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const char *buf, size_t len)
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{
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struct btrfs_fs_info *fs = container_of(kobj, struct btrfs_fs_info,
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super_kobj);
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struct btrfs_super_attr *a = container_of(attr,
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struct btrfs_super_attr,
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attr);
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return a->store ? a->store(fs, buf, len) : 0;
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}
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static ssize_t btrfs_root_attr_show(struct kobject *kobj,
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struct attribute *attr, char *buf)
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{
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struct btrfs_root *root = container_of(kobj, struct btrfs_root,
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root_kobj);
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struct btrfs_root_attr *a = container_of(attr,
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struct btrfs_root_attr,
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attr);
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return a->show ? a->show(root, buf) : 0;
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}
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static ssize_t btrfs_root_attr_store(struct kobject *kobj,
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struct attribute *attr,
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const char *buf, size_t len)
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{
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struct btrfs_root *root = container_of(kobj, struct btrfs_root,
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root_kobj);
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struct btrfs_root_attr *a = container_of(attr,
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struct btrfs_root_attr,
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attr);
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return a->store ? a->store(root, buf, len) : 0;
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}
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static void btrfs_super_release(struct kobject *kobj)
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{
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struct btrfs_fs_info *fs = container_of(kobj, struct btrfs_fs_info,
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super_kobj);
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complete(&fs->kobj_unregister);
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}
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static void btrfs_root_release(struct kobject *kobj)
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{
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struct btrfs_root *root = container_of(kobj, struct btrfs_root,
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root_kobj);
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complete(&root->kobj_unregister);
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}
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static struct sysfs_ops btrfs_super_attr_ops = {
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.show = btrfs_super_attr_show,
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.store = btrfs_super_attr_store,
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};
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static struct sysfs_ops btrfs_root_attr_ops = {
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.show = btrfs_root_attr_show,
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.store = btrfs_root_attr_store,
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};
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static struct kobj_type btrfs_root_ktype = {
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.default_attrs = btrfs_root_attrs,
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.sysfs_ops = &btrfs_root_attr_ops,
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.release = btrfs_root_release,
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};
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static struct kobj_type btrfs_super_ktype = {
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.default_attrs = btrfs_super_attrs,
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.sysfs_ops = &btrfs_super_attr_ops,
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.release = btrfs_super_release,
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};
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static struct kset btrfs_kset = {
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.kobj = {.name = "btrfs"},
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};
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int btrfs_sysfs_add_super(struct btrfs_fs_info *fs)
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{
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int error;
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fs->super_kobj.kset = &btrfs_kset;
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fs->super_kobj.ktype = &btrfs_super_ktype;
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error = kobject_set_name(&fs->super_kobj, "%s",
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fs->sb->s_id);
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if (error)
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goto fail;
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error = kobject_register(&fs->super_kobj);
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if (error)
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goto fail;
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return 0;
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fail:
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printk(KERN_ERR "btrfs: sysfs creation for super failed\n");
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return error;
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}
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int btrfs_sysfs_add_root(struct btrfs_root *root)
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{
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int error;
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root->root_kobj.ktype = &btrfs_root_ktype;
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root->root_kobj.parent = &root->fs_info->super_kobj;
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error = kobject_set_name(&root->root_kobj, "%s", root->name);
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if (error) {
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goto fail;
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}
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error = kobject_register(&root->root_kobj);
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if (error)
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goto fail;
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return 0;
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fail:
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printk(KERN_ERR "btrfs: sysfs creation for root failed\n");
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return error;
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}
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void btrfs_sysfs_del_root(struct btrfs_root *root)
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{
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kobject_unregister(&root->root_kobj);
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wait_for_completion(&root->kobj_unregister);
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}
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void btrfs_sysfs_del_super(struct btrfs_fs_info *fs)
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{
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kobject_unregister(&fs->super_kobj);
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wait_for_completion(&fs->kobj_unregister);
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}
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int btrfs_init_sysfs()
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{
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kobj_set_kset_s(&btrfs_kset, fs_subsys);
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return kset_register(&btrfs_kset);
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}
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void btrfs_exit_sysfs()
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{
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kset_unregister(&btrfs_kset);
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}
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