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![Emese Revfy](/assets/img/avatar_default.png)
Constify struct sysfs_ops. This is part of the ops structure constification effort started by Arjan van de Ven et al. Benefits of this constification: * prevents modification of data that is shared (referenced) by many other structure instances at runtime * detects/prevents accidental (but not intentional) modification attempts on archs that enforce read-only kernel data at runtime * potentially better optimized code as the compiler can assume that the const data cannot be changed * the compiler/linker move const data into .rodata and therefore exclude them from false sharing Signed-off-by: Emese Revfy <re.emese@gmail.com> Acked-by: David Teigland <teigland@redhat.com> Acked-by: Matt Domsch <Matt_Domsch@dell.com> Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com> Acked-by: Hans J. Koch <hjk@linutronix.de> Acked-by: Pekka Enberg <penberg@cs.helsinki.fi> Acked-by: Jens Axboe <jens.axboe@oracle.com> Acked-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
269 lines
6.8 KiB
C
269 lines
6.8 KiB
C
/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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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_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_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_bytes_used(&fs->super_copy));
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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_bytes(&fs->super_copy));
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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_sectorsize(&fs->super_copy));
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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, \
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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, \
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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 const 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 const 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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/* /sys/fs/btrfs/ entry */
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static struct kset *btrfs_kset;
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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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char *name;
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char c;
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int len = strlen(fs->sb->s_id) + 1;
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int i;
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name = kmalloc(len, GFP_NOFS);
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if (!name) {
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error = -ENOMEM;
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goto fail;
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}
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for (i = 0; i < len; i++) {
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c = fs->sb->s_id[i];
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if (c == '/' || c == '\\')
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c = '!';
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name[i] = c;
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}
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name[len] = '\0';
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fs->super_kobj.kset = btrfs_kset;
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error = kobject_init_and_add(&fs->super_kobj, &btrfs_super_ktype,
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NULL, "%s", name);
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kfree(name);
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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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error = kobject_init_and_add(&root->root_kobj, &btrfs_root_ktype,
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&root->fs_info->super_kobj,
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"%s", root->name);
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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_put(&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_put(&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(void)
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{
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btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
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if (!btrfs_kset)
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return -ENOMEM;
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return 0;
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}
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void btrfs_exit_sysfs(void)
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{
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kset_unregister(btrfs_kset);
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}
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