/* * 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 <linux/sched.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/completion.h> #include <linux/buffer_head.h> #include <linux/module.h> #include <linux/kobject.h> #include "ctree.h" #include "disk-io.h" #include "transaction.h" static ssize_t root_blocks_used_show(struct btrfs_root *root, char *buf) { return snprintf(buf, PAGE_SIZE, "%llu\n", (unsigned long long)btrfs_root_used(&root->root_item)); } static ssize_t root_block_limit_show(struct btrfs_root *root, char *buf) { return snprintf(buf, PAGE_SIZE, "%llu\n", (unsigned long long)btrfs_root_limit(&root->root_item)); } static ssize_t super_blocks_used_show(struct btrfs_fs_info *fs, char *buf) { return snprintf(buf, PAGE_SIZE, "%llu\n", (unsigned long long)btrfs_super_bytes_used(&fs->super_copy)); } static ssize_t super_total_blocks_show(struct btrfs_fs_info *fs, char *buf) { return snprintf(buf, PAGE_SIZE, "%llu\n", (unsigned long long)btrfs_super_total_bytes(&fs->super_copy)); } static ssize_t super_blocksize_show(struct btrfs_fs_info *fs, char *buf) { return snprintf(buf, PAGE_SIZE, "%llu\n", (unsigned long long)btrfs_super_sectorsize(&fs->super_copy)); } /* this is for root attrs (subvols/snapshots) */ struct btrfs_root_attr { struct attribute attr; ssize_t (*show)(struct btrfs_root *, char *); ssize_t (*store)(struct btrfs_root *, const char *, size_t); }; #define ROOT_ATTR(name, mode, show, store) \ static struct btrfs_root_attr btrfs_root_attr_##name = __ATTR(name, mode, \ show, store) ROOT_ATTR(blocks_used, 0444, root_blocks_used_show, NULL); ROOT_ATTR(block_limit, 0644, root_block_limit_show, NULL); static struct attribute *btrfs_root_attrs[] = { &btrfs_root_attr_blocks_used.attr, &btrfs_root_attr_block_limit.attr, NULL, }; /* this is for super attrs (actual full fs) */ 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); }; #define SUPER_ATTR(name, mode, show, store) \ static struct btrfs_super_attr btrfs_super_attr_##name = __ATTR(name, mode, \ show, store) SUPER_ATTR(blocks_used, 0444, super_blocks_used_show, NULL); SUPER_ATTR(total_blocks, 0444, super_total_blocks_show, NULL); SUPER_ATTR(blocksize, 0444, super_blocksize_show, NULL); static struct attribute *btrfs_super_attrs[] = { &btrfs_super_attr_blocks_used.attr, &btrfs_super_attr_total_blocks.attr, &btrfs_super_attr_blocksize.attr, NULL, }; static ssize_t btrfs_super_attr_show(struct kobject *kobj, 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); return a->show ? a->show(fs, buf) : 0; } static ssize_t btrfs_super_attr_store(struct kobject *kobj, 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); return a->store ? a->store(fs, buf, len) : 0; } static ssize_t btrfs_root_attr_show(struct kobject *kobj, 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); return a->show ? a->show(root, buf) : 0; } static ssize_t btrfs_root_attr_store(struct kobject *kobj, 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; } static void btrfs_super_release(struct kobject *kobj) { struct btrfs_fs_info *fs = container_of(kobj, struct btrfs_fs_info, super_kobj); complete(&fs->kobj_unregister); } static void btrfs_root_release(struct kobject *kobj) { struct btrfs_root *root = container_of(kobj, struct btrfs_root, root_kobj); complete(&root->kobj_unregister); } static struct sysfs_ops btrfs_super_attr_ops = { .show = btrfs_super_attr_show, .store = btrfs_super_attr_store, }; static struct sysfs_ops btrfs_root_attr_ops = { .show = btrfs_root_attr_show, .store = btrfs_root_attr_store, }; static struct kobj_type btrfs_root_ktype = { .default_attrs = btrfs_root_attrs, .sysfs_ops = &btrfs_root_attr_ops, .release = btrfs_root_release, }; static struct kobj_type btrfs_super_ktype = { .default_attrs = btrfs_super_attrs, .sysfs_ops = &btrfs_super_attr_ops, .release = btrfs_super_release, }; /* /sys/fs/btrfs/ entry */ static struct kset *btrfs_kset; int btrfs_sysfs_add_super(struct btrfs_fs_info *fs) { int error; char *name; char c; int len = strlen(fs->sb->s_id) + 1; int i; name = kmalloc(len, GFP_NOFS); if (!name) { error = -ENOMEM; goto fail; } for (i = 0; i < len; i++) { c = fs->sb->s_id[i]; if (c == '/' || c == '\\') c = '!'; name[i] = c; } name[len] = '\0'; fs->super_kobj.kset = btrfs_kset; error = kobject_init_and_add(&fs->super_kobj, &btrfs_super_ktype, NULL, "%s", name); kfree(name); if (error) goto fail; return 0; fail: printk(KERN_ERR "btrfs: sysfs creation for super failed\n"); return error; } int btrfs_sysfs_add_root(struct btrfs_root *root) { int error; error = kobject_init_and_add(&root->root_kobj, &btrfs_root_ktype, &root->fs_info->super_kobj, "%s", root->name); if (error) goto fail; return 0; fail: printk(KERN_ERR "btrfs: sysfs creation for root failed\n"); return error; } void btrfs_sysfs_del_root(struct btrfs_root *root) { kobject_put(&root->root_kobj); wait_for_completion(&root->kobj_unregister); } void btrfs_sysfs_del_super(struct btrfs_fs_info *fs) { kobject_put(&fs->super_kobj); wait_for_completion(&fs->kobj_unregister); } int btrfs_init_sysfs(void) { btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); if (!btrfs_kset) return -ENOMEM; return 0; } void btrfs_exit_sysfs(void) { kset_unregister(btrfs_kset); }