2007-06-12 13:07:21 +00:00
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/*
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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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2007-08-29 13:11:44 +00:00
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#include <linux/blkdev.h>
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2007-03-21 15:12:56 +00:00
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#include <linux/module.h>
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2007-03-22 16:13:20 +00:00
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#include <linux/buffer_head.h>
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2007-03-21 15:12:56 +00:00
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include <linux/highmem.h>
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#include <linux/time.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/smp_lock.h>
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#include <linux/backing-dev.h>
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2007-08-29 13:11:44 +00:00
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#include <linux/mount.h>
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2007-03-26 20:00:06 +00:00
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#include <linux/mpage.h>
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2007-03-29 15:56:46 +00:00
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#include <linux/swap.h>
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#include <linux/writeback.h>
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2007-04-20 01:01:03 +00:00
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#include <linux/statfs.h>
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2007-06-08 19:33:54 +00:00
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#include <linux/compat.h>
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2007-08-29 13:11:44 +00:00
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#include <linux/parser.h>
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2007-12-18 01:14:04 +00:00
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#include <linux/ctype.h>
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2007-12-18 21:15:09 +00:00
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#include <linux/namei.h>
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2007-03-21 15:12:56 +00:00
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#include "ctree.h"
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2007-03-22 16:13:20 +00:00
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#include "disk-io.h"
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2007-03-23 14:01:08 +00:00
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#include "transaction.h"
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2007-04-02 14:50:19 +00:00
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#include "btrfs_inode.h"
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2007-04-10 13:27:04 +00:00
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#include "ioctl.h"
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2007-05-24 17:35:57 +00:00
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#include "print-tree.h"
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2007-11-16 16:45:54 +00:00
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#include "xattr.h"
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2007-03-21 15:12:56 +00:00
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2007-10-15 20:14:19 +00:00
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#define BTRFS_SUPER_MAGIC 0x9123683E
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2007-03-29 19:15:27 +00:00
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2007-06-12 10:35:45 +00:00
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static struct super_operations btrfs_super_ops;
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2007-03-29 15:56:46 +00:00
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2007-06-12 10:35:45 +00:00
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static void btrfs_put_super (struct super_block * sb)
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2007-04-17 17:26:50 +00:00
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{
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2007-06-12 10:35:45 +00:00
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struct btrfs_root *root = btrfs_sb(sb);
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2007-08-29 19:47:34 +00:00
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struct btrfs_fs_info *fs = root->fs_info;
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2007-04-17 17:26:50 +00:00
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int ret;
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2007-06-12 10:35:45 +00:00
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ret = close_ctree(root);
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if (ret) {
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printk("close ctree returns %d\n", ret);
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2007-03-29 15:56:46 +00:00
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}
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2007-08-29 19:47:34 +00:00
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btrfs_sysfs_del_super(fs);
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2007-06-12 10:35:45 +00:00
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sb->s_fs_info = NULL;
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2007-03-29 15:56:46 +00:00
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}
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2007-08-29 13:11:44 +00:00
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enum {
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2008-01-02 15:01:11 +00:00
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Opt_subvol, Opt_nodatasum, Opt_nodatacow, Opt_max_extent,
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2008-01-09 14:23:21 +00:00
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Opt_alloc_start, Opt_nobarrier, Opt_err,
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2007-08-29 13:11:44 +00:00
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};
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static match_table_t tokens = {
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{Opt_subvol, "subvol=%s"},
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2007-12-14 20:30:32 +00:00
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{Opt_nodatasum, "nodatasum"},
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2007-12-18 01:14:01 +00:00
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{Opt_nodatacow, "nodatacow"},
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2008-01-09 14:23:21 +00:00
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{Opt_nobarrier, "nobarrier"},
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2007-12-18 01:14:04 +00:00
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{Opt_max_extent, "max_extent=%s"},
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2008-01-02 15:01:11 +00:00
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{Opt_alloc_start, "alloc_start=%s"},
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2007-08-29 13:11:44 +00:00
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{Opt_err, NULL}
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};
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2007-12-21 21:27:24 +00:00
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u64 btrfs_parse_size(char *str)
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2007-12-18 01:14:04 +00:00
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{
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2007-12-21 21:27:24 +00:00
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u64 res;
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2007-12-18 01:14:04 +00:00
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int mult = 1;
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char *end;
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char last;
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res = simple_strtoul(str, &end, 10);
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last = end[0];
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if (isalpha(last)) {
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last = tolower(last);
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switch (last) {
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case 'g':
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mult *= 1024;
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case 'm':
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mult *= 1024;
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case 'k':
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mult *= 1024;
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}
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res = res * mult;
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}
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return res;
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}
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2007-08-29 13:11:44 +00:00
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static int parse_options (char * options,
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struct btrfs_root *root,
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char **subvol_name)
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{
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char * p;
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2007-12-14 20:30:32 +00:00
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struct btrfs_fs_info *info = NULL;
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2007-08-29 13:11:44 +00:00
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substring_t args[MAX_OPT_ARGS];
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2007-12-14 20:30:32 +00:00
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2007-08-29 13:11:44 +00:00
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if (!options)
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return 1;
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2007-12-18 01:14:01 +00:00
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/*
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* strsep changes the string, duplicate it because parse_options
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* gets called twice
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*/
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options = kstrdup(options, GFP_NOFS);
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if (!options)
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return -ENOMEM;
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if (root)
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info = root->fs_info;
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2007-08-29 13:11:44 +00:00
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while ((p = strsep (&options, ",")) != NULL) {
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int token;
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if (!*p)
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continue;
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token = match_token(p, tokens, args);
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switch (token) {
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case Opt_subvol:
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2007-12-18 01:14:01 +00:00
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if (subvol_name) {
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2007-12-14 20:30:32 +00:00
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*subvol_name = match_strdup(&args[0]);
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2007-12-18 01:14:01 +00:00
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}
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2007-12-14 20:30:32 +00:00
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break;
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case Opt_nodatasum:
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2007-12-18 01:14:01 +00:00
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if (info) {
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printk("btrfs: setting nodatacsum\n");
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2007-12-14 20:30:32 +00:00
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btrfs_set_opt(info->mount_opt, NODATASUM);
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2007-12-18 01:14:01 +00:00
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}
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break;
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case Opt_nodatacow:
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if (info) {
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printk("btrfs: setting nodatacow\n");
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btrfs_set_opt(info->mount_opt, NODATACOW);
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btrfs_set_opt(info->mount_opt, NODATASUM);
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}
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2007-08-29 13:11:44 +00:00
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break;
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2008-01-09 14:23:21 +00:00
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case Opt_nobarrier:
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if (info) {
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printk("btrfs: turning off barriers\n");
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btrfs_set_opt(info->mount_opt, NOBARRIER);
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}
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break;
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2007-12-18 01:14:04 +00:00
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case Opt_max_extent:
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if (info) {
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char *num = match_strdup(&args[0]);
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if (num) {
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2007-12-21 21:27:24 +00:00
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info->max_extent =
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btrfs_parse_size(num);
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2007-12-18 01:14:04 +00:00
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kfree(num);
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info->max_extent = max_t(u64,
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info->max_extent,
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root->sectorsize);
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printk("btrfs: max_extent at %Lu\n",
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info->max_extent);
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}
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}
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break;
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2008-01-02 15:01:11 +00:00
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case Opt_alloc_start:
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if (info) {
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char *num = match_strdup(&args[0]);
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if (num) {
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info->alloc_start =
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btrfs_parse_size(num);
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kfree(num);
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printk("btrfs: allocations start at "
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"%Lu\n", info->alloc_start);
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}
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}
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break;
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2007-08-29 13:11:44 +00:00
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default:
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2007-12-18 01:14:01 +00:00
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break;
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2007-08-29 13:11:44 +00:00
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}
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}
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2007-12-18 01:14:01 +00:00
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kfree(options);
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2007-08-29 13:11:44 +00:00
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return 1;
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}
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2007-06-12 10:35:45 +00:00
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static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
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2007-03-29 15:56:46 +00:00
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{
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2007-06-12 10:35:45 +00:00
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struct inode * inode;
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struct dentry * root_dentry;
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struct btrfs_super_block *disk_super;
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struct btrfs_root *tree_root;
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struct btrfs_inode *bi;
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int err;
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2007-04-18 20:15:28 +00:00
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2007-06-12 10:35:45 +00:00
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sb->s_maxbytes = MAX_LFS_FILESIZE;
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sb->s_magic = BTRFS_SUPER_MAGIC;
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sb->s_op = &btrfs_super_ops;
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2007-11-16 16:45:54 +00:00
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sb->s_xattr = btrfs_xattr_handlers;
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2007-06-12 10:35:45 +00:00
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sb->s_time_gran = 1;
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2007-04-18 20:15:28 +00:00
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2007-06-12 10:35:45 +00:00
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tree_root = open_ctree(sb);
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2007-04-16 13:22:45 +00:00
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2007-06-12 10:35:45 +00:00
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if (!tree_root || IS_ERR(tree_root)) {
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printk("btrfs: open_ctree failed\n");
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return -EIO;
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2007-04-18 20:15:28 +00:00
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}
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2007-06-12 10:35:45 +00:00
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sb->s_fs_info = tree_root;
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2007-10-15 20:14:19 +00:00
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disk_super = &tree_root->fs_info->super_copy;
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2007-06-12 10:35:45 +00:00
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inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super),
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tree_root);
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bi = BTRFS_I(inode);
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bi->location.objectid = inode->i_ino;
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bi->location.offset = 0;
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bi->root = tree_root;
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2007-08-27 20:49:44 +00:00
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2007-06-12 10:35:45 +00:00
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btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY);
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2007-04-18 20:15:28 +00:00
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2007-06-12 10:35:45 +00:00
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if (!inode) {
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2007-04-16 13:22:45 +00:00
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err = -ENOMEM;
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2007-06-12 10:35:45 +00:00
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goto fail_close;
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2007-03-29 19:15:27 +00:00
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}
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2007-06-12 10:35:45 +00:00
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if (inode->i_state & I_NEW) {
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btrfs_read_locked_inode(inode);
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unlock_new_inode(inode);
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2007-03-29 19:15:27 +00:00
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}
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2007-06-12 10:35:45 +00:00
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root_dentry = d_alloc_root(inode);
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if (!root_dentry) {
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iput(inode);
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err = -ENOMEM;
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goto fail_close;
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2007-03-29 19:15:27 +00:00
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}
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2007-08-29 19:47:34 +00:00
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2007-12-14 20:30:32 +00:00
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parse_options((char *)data, tree_root, NULL);
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2007-08-29 19:47:34 +00:00
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/* this does the super kobj at the same time */
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err = btrfs_sysfs_add_super(tree_root->fs_info);
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if (err)
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goto fail_close;
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2007-06-12 10:35:45 +00:00
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sb->s_root = root_dentry;
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btrfs_transaction_queue_work(tree_root, HZ * 30);
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2007-04-10 20:58:11 +00:00
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return 0;
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2007-06-12 10:35:45 +00:00
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fail_close:
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close_ctree(tree_root);
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return err;
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2007-04-10 20:58:11 +00:00
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}
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2007-06-12 10:35:45 +00:00
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static int btrfs_sync_fs(struct super_block *sb, int wait)
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2007-04-10 13:27:04 +00:00
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{
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struct btrfs_trans_handle *trans;
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2007-06-12 10:35:45 +00:00
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struct btrfs_root *root;
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2007-04-10 13:27:04 +00:00
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int ret;
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2007-06-12 10:35:45 +00:00
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root = btrfs_sb(sb);
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2007-04-10 20:58:11 +00:00
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2007-06-12 10:35:45 +00:00
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sb->s_dirt = 0;
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if (!wait) {
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filemap_flush(root->fs_info->btree_inode->i_mapping);
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return 0;
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}
|
2007-08-10 18:06:19 +00:00
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btrfs_clean_old_snapshots(root);
|
2007-04-10 13:27:04 +00:00
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mutex_lock(&root->fs_info->fs_mutex);
|
2007-08-10 18:06:19 +00:00
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btrfs_defrag_dirty_roots(root->fs_info);
|
2007-04-10 13:27:04 +00:00
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trans = btrfs_start_transaction(root, 1);
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ret = btrfs_commit_transaction(trans, root);
|
2007-06-12 10:35:45 +00:00
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sb->s_dirt = 0;
|
2007-04-10 13:27:04 +00:00
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mutex_unlock(&root->fs_info->fs_mutex);
|
2007-06-22 18:16:25 +00:00
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return ret;
|
2007-04-02 14:50:19 +00:00
|
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}
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|
2007-06-12 10:35:45 +00:00
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static void btrfs_write_super(struct super_block *sb)
|
2007-04-02 14:50:19 +00:00
|
|
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{
|
2007-06-12 10:35:45 +00:00
|
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sb->s_dirt = 0;
|
2007-04-02 14:50:19 +00:00
|
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}
|
|
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|
2007-08-29 13:11:44 +00:00
|
|
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/*
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|
|
|
* This is almost a copy of get_sb_bdev in fs/super.c.
|
|
|
|
* We need the local copy to allow direct mounting of
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* subvolumes, but this could be easily integrated back
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* into the generic version. --hch
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*/
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|
/* start copy & paste */
|
|
|
|
static int set_bdev_super(struct super_block *s, void *data)
|
|
|
|
{
|
|
|
|
s->s_bdev = data;
|
|
|
|
s->s_dev = s->s_bdev->bd_dev;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int test_bdev_super(struct super_block *s, void *data)
|
|
|
|
{
|
|
|
|
return (void *)s->s_bdev == data;
|
|
|
|
}
|
|
|
|
|
|
|
|
int btrfs_get_sb_bdev(struct file_system_type *fs_type,
|
|
|
|
int flags, const char *dev_name, void *data,
|
|
|
|
int (*fill_super)(struct super_block *, void *, int),
|
|
|
|
struct vfsmount *mnt, const char *subvol)
|
|
|
|
{
|
|
|
|
struct block_device *bdev = NULL;
|
|
|
|
struct super_block *s;
|
|
|
|
struct dentry *root;
|
|
|
|
int error = 0;
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|
|
|
|
|
|
|
bdev = open_bdev_excl(dev_name, flags, fs_type);
|
|
|
|
if (IS_ERR(bdev))
|
|
|
|
return PTR_ERR(bdev);
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|
|
|
|
|
|
|
/*
|
|
|
|
* once the super is inserted into the list by sget, s_umount
|
|
|
|
* will protect the lockfs code from trying to start a snapshot
|
|
|
|
* while we are mounting
|
|
|
|
*/
|
|
|
|
down(&bdev->bd_mount_sem);
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|
|
|
s = sget(fs_type, test_bdev_super, set_bdev_super, bdev);
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|
|
|
up(&bdev->bd_mount_sem);
|
|
|
|
if (IS_ERR(s))
|
|
|
|
goto error_s;
|
|
|
|
|
|
|
|
if (s->s_root) {
|
|
|
|
if ((flags ^ s->s_flags) & MS_RDONLY) {
|
|
|
|
up_write(&s->s_umount);
|
|
|
|
deactivate_super(s);
|
|
|
|
error = -EBUSY;
|
|
|
|
goto error_bdev;
|
|
|
|
}
|
|
|
|
|
|
|
|
close_bdev_excl(bdev);
|
|
|
|
} else {
|
|
|
|
char b[BDEVNAME_SIZE];
|
|
|
|
|
|
|
|
s->s_flags = flags;
|
|
|
|
strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
|
|
|
|
sb_set_blocksize(s, block_size(bdev));
|
|
|
|
error = fill_super(s, data, flags & MS_SILENT ? 1 : 0);
|
|
|
|
if (error) {
|
|
|
|
up_write(&s->s_umount);
|
|
|
|
deactivate_super(s);
|
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
|
|
|
|
s->s_flags |= MS_ACTIVE;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (subvol) {
|
|
|
|
root = lookup_one_len(subvol, s->s_root, strlen(subvol));
|
|
|
|
if (IS_ERR(root)) {
|
|
|
|
up_write(&s->s_umount);
|
|
|
|
deactivate_super(s);
|
|
|
|
error = PTR_ERR(root);
|
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
if (!root->d_inode) {
|
|
|
|
dput(root);
|
|
|
|
up_write(&s->s_umount);
|
|
|
|
deactivate_super(s);
|
|
|
|
error = -ENXIO;
|
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
root = dget(s->s_root);
|
|
|
|
}
|
|
|
|
|
|
|
|
mnt->mnt_sb = s;
|
|
|
|
mnt->mnt_root = root;
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
error_s:
|
|
|
|
error = PTR_ERR(s);
|
|
|
|
error_bdev:
|
|
|
|
close_bdev_excl(bdev);
|
|
|
|
error:
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
/* end copy & paste */
|
|
|
|
|
2007-03-21 15:12:56 +00:00
|
|
|
static int btrfs_get_sb(struct file_system_type *fs_type,
|
2007-08-29 13:11:44 +00:00
|
|
|
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
|
2007-03-21 15:12:56 +00:00
|
|
|
{
|
2007-08-29 13:11:44 +00:00
|
|
|
int ret;
|
2007-08-29 13:11:44 +00:00
|
|
|
char *subvol_name = NULL;
|
2007-08-29 13:11:44 +00:00
|
|
|
|
2007-08-29 13:11:44 +00:00
|
|
|
parse_options((char *)data, NULL, &subvol_name);
|
2007-08-29 13:11:44 +00:00
|
|
|
ret = btrfs_get_sb_bdev(fs_type, flags, dev_name, data,
|
|
|
|
btrfs_fill_super, mnt,
|
|
|
|
subvol_name ? subvol_name : "default");
|
2007-12-18 01:14:04 +00:00
|
|
|
if (subvol_name)
|
|
|
|
kfree(subvol_name);
|
2007-08-29 13:11:44 +00:00
|
|
|
return ret;
|
2007-03-21 15:12:56 +00:00
|
|
|
}
|
|
|
|
|
2007-04-20 01:01:03 +00:00
|
|
|
static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
|
|
{
|
|
|
|
struct btrfs_root *root = btrfs_sb(dentry->d_sb);
|
2007-06-26 14:06:50 +00:00
|
|
|
struct btrfs_super_block *disk_super = &root->fs_info->super_copy;
|
2007-10-15 20:15:53 +00:00
|
|
|
int bits = dentry->d_sb->s_blocksize_bits;
|
2007-04-20 01:01:03 +00:00
|
|
|
|
|
|
|
buf->f_namelen = BTRFS_NAME_LEN;
|
2007-10-15 20:15:53 +00:00
|
|
|
buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits;
|
|
|
|
buf->f_bfree = buf->f_blocks -
|
|
|
|
(btrfs_super_bytes_used(disk_super) >> bits);
|
2007-04-20 01:01:03 +00:00
|
|
|
buf->f_bavail = buf->f_bfree;
|
|
|
|
buf->f_bsize = dentry->d_sb->s_blocksize;
|
|
|
|
buf->f_type = BTRFS_SUPER_MAGIC;
|
|
|
|
return 0;
|
|
|
|
}
|
2007-04-24 15:52:22 +00:00
|
|
|
|
2007-03-21 15:12:56 +00:00
|
|
|
static struct file_system_type btrfs_fs_type = {
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.name = "btrfs",
|
|
|
|
.get_sb = btrfs_get_sb,
|
|
|
|
.kill_sb = kill_block_super,
|
|
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
|
|
};
|
|
|
|
|
2007-03-22 16:13:20 +00:00
|
|
|
static struct super_operations btrfs_super_ops = {
|
2007-03-25 17:44:56 +00:00
|
|
|
.delete_inode = btrfs_delete_inode,
|
2007-03-22 16:13:20 +00:00
|
|
|
.put_super = btrfs_put_super,
|
|
|
|
.read_inode = btrfs_read_locked_inode,
|
2007-03-23 14:01:08 +00:00
|
|
|
.write_super = btrfs_write_super,
|
|
|
|
.sync_fs = btrfs_sync_fs,
|
2007-03-26 16:00:39 +00:00
|
|
|
.write_inode = btrfs_write_inode,
|
2007-04-24 15:52:22 +00:00
|
|
|
.dirty_inode = btrfs_dirty_inode,
|
2007-04-02 14:50:19 +00:00
|
|
|
.alloc_inode = btrfs_alloc_inode,
|
|
|
|
.destroy_inode = btrfs_destroy_inode,
|
2007-04-20 01:01:03 +00:00
|
|
|
.statfs = btrfs_statfs,
|
2007-03-22 16:13:20 +00:00
|
|
|
};
|
|
|
|
|
2007-03-21 15:12:56 +00:00
|
|
|
static int __init init_btrfs_fs(void)
|
|
|
|
{
|
2007-04-02 14:50:19 +00:00
|
|
|
int err;
|
2007-08-29 19:47:34 +00:00
|
|
|
|
|
|
|
err = btrfs_init_sysfs();
|
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
|
2007-06-08 19:33:54 +00:00
|
|
|
btrfs_init_transaction_sys();
|
2007-06-12 10:35:45 +00:00
|
|
|
err = btrfs_init_cachep();
|
2007-04-02 14:50:19 +00:00
|
|
|
if (err)
|
2007-11-19 15:22:33 +00:00
|
|
|
goto free_transaction_sys;
|
|
|
|
err = extent_map_init();
|
|
|
|
if (err)
|
|
|
|
goto free_cachep;
|
|
|
|
|
|
|
|
err = register_filesystem(&btrfs_fs_type);
|
|
|
|
if (err)
|
|
|
|
goto free_extent_map;
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
free_extent_map:
|
|
|
|
extent_map_exit();
|
|
|
|
free_cachep:
|
|
|
|
btrfs_destroy_cachep();
|
|
|
|
free_transaction_sys:
|
|
|
|
btrfs_exit_transaction_sys();
|
|
|
|
btrfs_exit_sysfs();
|
|
|
|
return err;
|
2007-03-21 15:12:56 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit exit_btrfs_fs(void)
|
|
|
|
{
|
2007-06-08 19:33:54 +00:00
|
|
|
btrfs_exit_transaction_sys();
|
2007-06-12 10:35:45 +00:00
|
|
|
btrfs_destroy_cachep();
|
2007-08-27 20:49:44 +00:00
|
|
|
extent_map_exit();
|
2007-03-21 15:12:56 +00:00
|
|
|
unregister_filesystem(&btrfs_fs_type);
|
2007-08-29 19:47:34 +00:00
|
|
|
btrfs_exit_sysfs();
|
2007-03-21 15:12:56 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
module_init(init_btrfs_fs)
|
|
|
|
module_exit(exit_btrfs_fs)
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|