2007-06-12 21:07:21 +08:00
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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 21:11:44 +08:00
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#include <linux/blkdev.h>
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2007-03-21 23:12:56 +08:00
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#include <linux/module.h>
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2007-03-23 00:13:20 +08:00
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#include <linux/buffer_head.h>
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2007-03-21 23:12:56 +08:00
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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 21:11:44 +08:00
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#include <linux/mount.h>
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2007-03-27 04:00:06 +08:00
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#include <linux/mpage.h>
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2007-03-29 23:56:46 +08:00
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#include <linux/swap.h>
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#include <linux/writeback.h>
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2007-04-20 09:01:03 +08:00
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#include <linux/statfs.h>
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2007-06-09 03:33:54 +08:00
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#include <linux/compat.h>
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2007-08-29 21:11:44 +08:00
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#include <linux/parser.h>
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2007-12-18 09:14:04 +08:00
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#include <linux/ctype.h>
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2007-12-19 05:15:09 +08:00
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#include <linux/namei.h>
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2008-03-25 03:02:04 +08:00
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#include <linux/miscdevice.h>
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2007-03-21 23:12:56 +08:00
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#include "ctree.h"
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2007-03-23 00:13:20 +08:00
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#include "disk-io.h"
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2007-03-23 22:01:08 +08:00
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#include "transaction.h"
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2007-04-02 22:50:19 +08:00
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#include "btrfs_inode.h"
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2007-04-10 21:27:04 +08:00
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#include "ioctl.h"
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2007-05-25 01:35:57 +08:00
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#include "print-tree.h"
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2007-11-17 00:45:54 +08:00
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#include "xattr.h"
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2008-03-25 03:02:07 +08:00
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#include "volumes.h"
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2007-03-21 23:12:56 +08:00
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2007-10-16 04:14:19 +08:00
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#define BTRFS_SUPER_MAGIC 0x9123683E
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2007-03-30 03:15:27 +08:00
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2007-06-12 18:35:45 +08:00
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static struct super_operations btrfs_super_ops;
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2007-03-29 23:56:46 +08:00
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2007-06-12 18:35:45 +08:00
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static void btrfs_put_super (struct super_block * sb)
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2007-04-18 01:26:50 +08:00
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{
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2007-06-12 18:35:45 +08:00
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struct btrfs_root *root = btrfs_sb(sb);
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2007-08-30 03:47:34 +08:00
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struct btrfs_fs_info *fs = root->fs_info;
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2007-04-18 01:26:50 +08:00
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int ret;
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2007-06-12 18:35:45 +08:00
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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 23:56:46 +08:00
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}
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2007-08-30 03:47:34 +08:00
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btrfs_sysfs_del_super(fs);
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2007-06-12 18:35:45 +08:00
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sb->s_fs_info = NULL;
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2007-03-29 23:56:46 +08:00
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}
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2007-08-29 21:11:44 +08:00
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enum {
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2008-05-14 01:46:40 +08:00
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Opt_degraded, Opt_subvol, Opt_nodatasum, Opt_nodatacow,
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Opt_max_extent, Opt_max_inline, Opt_alloc_start, Opt_nobarrier,
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Opt_ssd, Opt_err,
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2007-08-29 21:11:44 +08:00
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};
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static match_table_t tokens = {
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2008-05-14 01:46:40 +08:00
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{Opt_degraded, "degraded"},
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2007-08-29 21:11:44 +08:00
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{Opt_subvol, "subvol=%s"},
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2007-12-15 04:30:32 +08:00
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{Opt_nodatasum, "nodatasum"},
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2007-12-18 09:14:01 +08:00
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{Opt_nodatacow, "nodatacow"},
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2008-01-09 22:23:21 +08:00
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{Opt_nobarrier, "nobarrier"},
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2007-12-18 09:14:04 +08:00
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{Opt_max_extent, "max_extent=%s"},
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2008-01-30 05:03:38 +08:00
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{Opt_max_inline, "max_inline=%s"},
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2008-01-02 23:01:11 +08:00
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{Opt_alloc_start, "alloc_start=%s"},
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2008-01-18 23:54:22 +08:00
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{Opt_ssd, "ssd"},
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2007-08-29 21:11:44 +08:00
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{Opt_err, NULL}
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};
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2007-12-22 05:27:24 +08:00
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u64 btrfs_parse_size(char *str)
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2007-12-18 09:14:04 +08:00
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{
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2007-12-22 05:27:24 +08:00
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u64 res;
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2007-12-18 09:14:04 +08:00
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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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2008-06-10 22:40:29 +08:00
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/*
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* Regular mount options parser. Everything that is needed only when
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* reading in a new superblock is parsed here.
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*/
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int btrfs_parse_options(struct btrfs_root *root, char *options)
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2007-08-29 21:11:44 +08:00
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{
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2008-06-10 22:40:29 +08:00
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struct btrfs_fs_info *info = root->fs_info;
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2007-08-29 21:11:44 +08:00
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substring_t args[MAX_OPT_ARGS];
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2008-06-10 22:40:29 +08:00
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char *p, *num;
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2007-12-15 04:30:32 +08:00
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2007-08-29 21:11:44 +08:00
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if (!options)
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2008-06-10 22:40:29 +08:00
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return 0;
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2007-08-29 21:11:44 +08:00
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2007-12-18 09:14:01 +08:00
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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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2008-06-10 22:40:29 +08:00
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while ((p = strsep(&options, ",")) != NULL) {
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2007-08-29 21:11:44 +08:00
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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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2008-05-14 01:46:40 +08:00
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case Opt_degraded:
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2008-06-10 22:40:29 +08:00
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printk(KERN_INFO "btrfs: allowing degraded mounts\n");
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btrfs_set_opt(info->mount_opt, DEGRADED);
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2008-05-14 01:46:40 +08:00
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break;
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2007-08-29 21:11:44 +08:00
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case Opt_subvol:
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2008-06-10 22:40:29 +08:00
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/*
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* This one is parsed by btrfs_parse_early_options
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* and can be happily ignored here.
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*/
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2007-12-15 04:30:32 +08:00
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break;
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case Opt_nodatasum:
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2008-06-10 22:40:29 +08:00
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printk(KERN_INFO "btrfs: setting nodatacsum\n");
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btrfs_set_opt(info->mount_opt, NODATASUM);
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2007-12-18 09:14:01 +08:00
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break;
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case Opt_nodatacow:
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2008-06-10 22:40:29 +08:00
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printk(KERN_INFO "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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2007-08-29 21:11:44 +08:00
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break;
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2008-01-18 23:54:22 +08:00
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case Opt_ssd:
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2008-06-10 22:40:29 +08:00
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printk(KERN_INFO "btrfs: use ssd allocation scheme\n");
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btrfs_set_opt(info->mount_opt, SSD);
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2008-01-18 23:54:22 +08:00
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break;
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2008-01-09 22:23:21 +08:00
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case Opt_nobarrier:
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2008-06-10 22:40:29 +08:00
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printk(KERN_INFO "btrfs: turning off barriers\n");
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btrfs_set_opt(info->mount_opt, NOBARRIER);
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2008-01-09 22:23:21 +08:00
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break;
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2007-12-18 09:14:04 +08:00
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case Opt_max_extent:
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2008-06-10 22:40:29 +08:00
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num = match_strdup(&args[0]);
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if (num) {
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info->max_extent = btrfs_parse_size(num);
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kfree(num);
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info->max_extent = max_t(u64,
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info->max_extent, root->sectorsize);
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printk(KERN_INFO "btrfs: max_extent at %llu\n",
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info->max_extent);
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2007-12-18 09:14:04 +08:00
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}
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break;
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2008-01-30 05:03:38 +08:00
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case Opt_max_inline:
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2008-06-10 22:40:29 +08:00
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num = match_strdup(&args[0]);
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if (num) {
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info->max_inline = btrfs_parse_size(num);
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kfree(num);
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info->max_inline = max_t(u64,
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info->max_inline, root->sectorsize);
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printk(KERN_INFO "btrfs: max_inline at %llu\n",
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info->max_inline);
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2008-01-30 05:03:38 +08:00
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}
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break;
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2008-01-02 23:01:11 +08:00
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case Opt_alloc_start:
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2008-06-10 22:40:29 +08:00
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num = match_strdup(&args[0]);
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if (num) {
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info->alloc_start = btrfs_parse_size(num);
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kfree(num);
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printk(KERN_INFO
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"btrfs: allocations start at %llu\n",
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info->alloc_start);
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2008-01-02 23:01:11 +08:00
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}
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break;
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2007-08-29 21:11:44 +08:00
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default:
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2007-12-18 09:14:01 +08:00
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break;
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2007-08-29 21:11:44 +08:00
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}
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}
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2007-12-18 09:14:01 +08:00
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kfree(options);
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2008-06-10 22:40:29 +08:00
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return 0;
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}
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/*
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* Parse mount options that are required early in the mount process.
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*
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* All other options will be parsed on much later in the mount process and
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* only when we need to allocate a new super block.
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*/
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static int btrfs_parse_early_options(const char *options,
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char **subvol_name)
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{
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substring_t args[MAX_OPT_ARGS];
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char *opts, *p;
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int error = 0;
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if (!options)
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goto out;
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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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opts = kstrdup(options, GFP_KERNEL);
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if (!opts)
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return -ENOMEM;
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while ((p = strsep(&opts, ",")) != 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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*subvol_name = match_strdup(&args[0]);
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break;
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default:
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break;
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}
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}
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kfree(opts);
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out:
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/*
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* If no subvolume name is specified we use the default one. Allocate
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* a copy of the string "default" here so that code later in the
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* mount path doesn't care if it's the default volume or another one.
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*/
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if (!*subvol_name) {
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*subvol_name = kstrdup("default", GFP_KERNEL);
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if (!*subvol_name)
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return -ENOMEM;
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}
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return error;
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2007-08-29 21:11:44 +08:00
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}
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2008-03-25 03:02:07 +08:00
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static int btrfs_fill_super(struct super_block * sb,
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struct btrfs_fs_devices *fs_devices,
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void * data, int silent)
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2007-03-29 23:56:46 +08:00
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{
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2007-06-12 18:35:45 +08:00
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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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2007-04-19 04:15:28 +08:00
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2007-06-12 18:35:45 +08:00
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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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2007-11-17 00:45:54 +08:00
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sb->s_xattr = btrfs_xattr_handlers;
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2007-06-12 18:35:45 +08:00
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sb->s_time_gran = 1;
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2007-04-19 04:15:28 +08:00
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2008-05-14 01:46:40 +08:00
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tree_root = open_ctree(sb, fs_devices, (char *)data);
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2007-04-16 21:22:45 +08:00
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2008-04-01 23:21:34 +08:00
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if (IS_ERR(tree_root)) {
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2007-06-12 18:35:45 +08:00
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printk("btrfs: open_ctree failed\n");
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2008-04-01 23:21:34 +08:00
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return PTR_ERR(tree_root);
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2007-04-19 04:15:28 +08:00
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}
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2007-06-12 18:35:45 +08:00
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sb->s_fs_info = tree_root;
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2007-10-16 04:14:19 +08:00
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disk_super = &tree_root->fs_info->super_copy;
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2007-06-12 18:35:45 +08:00
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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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2007-08-28 04:49:44 +08:00
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2007-06-12 18:35:45 +08:00
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btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY);
|
2007-04-19 04:15:28 +08:00
|
|
|
|
2007-06-12 18:35:45 +08:00
|
|
|
if (!inode) {
|
2007-04-16 21:22:45 +08:00
|
|
|
err = -ENOMEM;
|
2007-06-12 18:35:45 +08:00
|
|
|
goto fail_close;
|
2007-03-30 03:15:27 +08:00
|
|
|
}
|
2007-06-12 18:35:45 +08:00
|
|
|
if (inode->i_state & I_NEW) {
|
|
|
|
btrfs_read_locked_inode(inode);
|
|
|
|
unlock_new_inode(inode);
|
2007-03-30 03:15:27 +08:00
|
|
|
}
|
|
|
|
|
2007-06-12 18:35:45 +08:00
|
|
|
root_dentry = d_alloc_root(inode);
|
|
|
|
if (!root_dentry) {
|
|
|
|
iput(inode);
|
|
|
|
err = -ENOMEM;
|
|
|
|
goto fail_close;
|
2007-03-30 03:15:27 +08:00
|
|
|
}
|
2007-08-30 03:47:34 +08:00
|
|
|
|
|
|
|
/* this does the super kobj at the same time */
|
|
|
|
err = btrfs_sysfs_add_super(tree_root->fs_info);
|
|
|
|
if (err)
|
|
|
|
goto fail_close;
|
|
|
|
|
2007-06-12 18:35:45 +08:00
|
|
|
sb->s_root = root_dentry;
|
|
|
|
btrfs_transaction_queue_work(tree_root, HZ * 30);
|
2008-02-21 05:11:05 +08:00
|
|
|
|
|
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25)
|
|
|
|
save_mount_options(sb, data);
|
|
|
|
#endif
|
|
|
|
|
2007-04-11 04:58:11 +08:00
|
|
|
return 0;
|
2007-06-12 18:35:45 +08:00
|
|
|
|
|
|
|
fail_close:
|
|
|
|
close_ctree(tree_root);
|
|
|
|
return err;
|
2007-04-11 04:58:11 +08:00
|
|
|
}
|
|
|
|
|
2008-06-10 22:07:39 +08:00
|
|
|
int btrfs_sync_fs(struct super_block *sb, int wait)
|
2007-04-10 21:27:04 +08:00
|
|
|
{
|
|
|
|
struct btrfs_trans_handle *trans;
|
2007-06-12 18:35:45 +08:00
|
|
|
struct btrfs_root *root;
|
2007-04-10 21:27:04 +08:00
|
|
|
int ret;
|
2007-06-12 18:35:45 +08:00
|
|
|
root = btrfs_sb(sb);
|
2007-04-11 04:58:11 +08:00
|
|
|
|
2007-06-12 18:35:45 +08:00
|
|
|
sb->s_dirt = 0;
|
|
|
|
if (!wait) {
|
|
|
|
filemap_flush(root->fs_info->btree_inode->i_mapping);
|
|
|
|
return 0;
|
|
|
|
}
|
2007-08-11 02:06:19 +08:00
|
|
|
btrfs_clean_old_snapshots(root);
|
2007-04-10 21:27:04 +08:00
|
|
|
mutex_lock(&root->fs_info->fs_mutex);
|
2007-08-11 02:06:19 +08:00
|
|
|
btrfs_defrag_dirty_roots(root->fs_info);
|
2007-04-10 21:27:04 +08:00
|
|
|
trans = btrfs_start_transaction(root, 1);
|
|
|
|
ret = btrfs_commit_transaction(trans, root);
|
2007-06-12 18:35:45 +08:00
|
|
|
sb->s_dirt = 0;
|
2007-04-10 21:27:04 +08:00
|
|
|
mutex_unlock(&root->fs_info->fs_mutex);
|
2007-06-23 02:16:25 +08:00
|
|
|
return ret;
|
2007-04-02 22:50:19 +08:00
|
|
|
}
|
|
|
|
|
2007-06-12 18:35:45 +08:00
|
|
|
static void btrfs_write_super(struct super_block *sb)
|
2007-04-02 22:50:19 +08:00
|
|
|
{
|
2007-06-12 18:35:45 +08:00
|
|
|
sb->s_dirt = 0;
|
2007-04-02 22:50:19 +08:00
|
|
|
}
|
|
|
|
|
2008-05-07 23:43:44 +08:00
|
|
|
static int btrfs_test_super(struct super_block *s, void *data)
|
2007-08-29 21:11:44 +08:00
|
|
|
{
|
2008-05-07 23:43:44 +08:00
|
|
|
struct btrfs_fs_devices *test_fs_devices = data;
|
|
|
|
struct btrfs_root *root = btrfs_sb(s);
|
2007-08-29 21:11:44 +08:00
|
|
|
|
2008-05-07 23:43:44 +08:00
|
|
|
return root->fs_info->fs_devices == test_fs_devices;
|
2007-08-29 21:11:44 +08:00
|
|
|
}
|
|
|
|
|
2008-06-10 22:40:29 +08:00
|
|
|
/*
|
|
|
|
* Find a superblock for the given device / mount point.
|
|
|
|
*
|
|
|
|
* Note: This is based on get_sb_bdev from fs/super.c with a few additions
|
|
|
|
* for multiple device setup. Make sure to keep it in sync.
|
|
|
|
*/
|
|
|
|
static int btrfs_get_sb(struct file_system_type *fs_type, int flags,
|
|
|
|
const char *dev_name, void *data, struct vfsmount *mnt)
|
2007-08-29 21:11:44 +08:00
|
|
|
{
|
2008-06-10 22:40:29 +08:00
|
|
|
char *subvol_name = NULL;
|
2007-08-29 21:11:44 +08:00
|
|
|
struct block_device *bdev = NULL;
|
|
|
|
struct super_block *s;
|
|
|
|
struct dentry *root;
|
2008-03-25 03:02:07 +08:00
|
|
|
struct btrfs_fs_devices *fs_devices = NULL;
|
2007-08-29 21:11:44 +08:00
|
|
|
int error = 0;
|
|
|
|
|
2008-06-10 22:40:29 +08:00
|
|
|
error = btrfs_parse_early_options(data, &subvol_name);
|
|
|
|
if (error)
|
|
|
|
goto error;
|
|
|
|
|
2008-03-25 03:02:07 +08:00
|
|
|
error = btrfs_scan_one_device(dev_name, flags, fs_type, &fs_devices);
|
|
|
|
if (error)
|
2008-06-10 22:40:29 +08:00
|
|
|
goto error_free_subvol_name;
|
2007-08-29 21:11:44 +08:00
|
|
|
|
2008-03-25 03:02:07 +08:00
|
|
|
error = btrfs_open_devices(fs_devices, flags, fs_type);
|
|
|
|
if (error)
|
2008-06-10 22:40:29 +08:00
|
|
|
goto error_free_subvol_name;
|
2008-03-25 03:02:07 +08:00
|
|
|
|
2008-05-14 01:46:40 +08:00
|
|
|
bdev = fs_devices->latest_bdev;
|
2008-05-07 23:43:44 +08:00
|
|
|
btrfs_lock_volumes();
|
|
|
|
s = sget(fs_type, btrfs_test_super, set_anon_super, fs_devices);
|
|
|
|
btrfs_unlock_volumes();
|
2007-08-29 21:11:44 +08:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
|
|
|
} else {
|
|
|
|
char b[BDEVNAME_SIZE];
|
|
|
|
|
|
|
|
s->s_flags = flags;
|
|
|
|
strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
|
2008-03-25 03:02:07 +08:00
|
|
|
error = btrfs_fill_super(s, fs_devices, data,
|
|
|
|
flags & MS_SILENT ? 1 : 0);
|
2007-08-29 21:11:44 +08:00
|
|
|
if (error) {
|
|
|
|
up_write(&s->s_umount);
|
|
|
|
deactivate_super(s);
|
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
|
2008-04-29 03:29:42 +08:00
|
|
|
btrfs_sb(s)->fs_info->bdev_holder = fs_type;
|
2007-08-29 21:11:44 +08:00
|
|
|
s->s_flags |= MS_ACTIVE;
|
|
|
|
}
|
|
|
|
|
2008-06-10 22:40:29 +08:00
|
|
|
root = lookup_one_len(subvol_name, s->s_root, strlen(subvol_name));
|
|
|
|
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;
|
2007-08-29 21:11:44 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
mnt->mnt_sb = s;
|
|
|
|
mnt->mnt_root = root;
|
2008-06-10 22:40:29 +08:00
|
|
|
|
|
|
|
kfree(subvol_name);
|
2007-08-29 21:11:44 +08:00
|
|
|
return 0;
|
|
|
|
|
|
|
|
error_s:
|
|
|
|
error = PTR_ERR(s);
|
|
|
|
error_bdev:
|
2008-03-25 03:02:07 +08:00
|
|
|
btrfs_close_devices(fs_devices);
|
2008-06-10 22:40:29 +08:00
|
|
|
error_free_subvol_name:
|
|
|
|
kfree(subvol_name);
|
2007-08-29 21:11:44 +08:00
|
|
|
error:
|
|
|
|
return error;
|
|
|
|
}
|
2007-03-21 23:12:56 +08:00
|
|
|
|
2007-04-20 09:01:03 +08:00
|
|
|
static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
|
|
{
|
|
|
|
struct btrfs_root *root = btrfs_sb(dentry->d_sb);
|
2007-06-26 22:06:50 +08:00
|
|
|
struct btrfs_super_block *disk_super = &root->fs_info->super_copy;
|
2007-10-16 04:15:53 +08:00
|
|
|
int bits = dentry->d_sb->s_blocksize_bits;
|
2007-04-20 09:01:03 +08:00
|
|
|
|
|
|
|
buf->f_namelen = BTRFS_NAME_LEN;
|
2007-10-16 04:15:53 +08:00
|
|
|
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 09:01:03 +08:00
|
|
|
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 23:52:22 +08:00
|
|
|
|
2007-03-21 23:12:56 +08:00
|
|
|
static struct file_system_type btrfs_fs_type = {
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.name = "btrfs",
|
|
|
|
.get_sb = btrfs_get_sb,
|
2008-05-07 23:43:44 +08:00
|
|
|
.kill_sb = kill_anon_super,
|
2007-03-21 23:12:56 +08:00
|
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
|
|
};
|
2008-03-25 03:02:04 +08:00
|
|
|
|
2008-03-25 03:02:07 +08:00
|
|
|
static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
|
|
|
|
unsigned long arg)
|
|
|
|
{
|
|
|
|
struct btrfs_ioctl_vol_args *vol;
|
|
|
|
struct btrfs_fs_devices *fs_devices;
|
2008-06-10 10:17:11 +08:00
|
|
|
int ret = 0;
|
2008-03-25 03:02:07 +08:00
|
|
|
int len;
|
|
|
|
|
|
|
|
vol = kmalloc(sizeof(*vol), GFP_KERNEL);
|
|
|
|
if (copy_from_user(vol, (void __user *)arg, sizeof(*vol))) {
|
|
|
|
ret = -EFAULT;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
len = strnlen(vol->name, BTRFS_PATH_NAME_MAX);
|
|
|
|
switch (cmd) {
|
|
|
|
case BTRFS_IOC_SCAN_DEV:
|
|
|
|
ret = btrfs_scan_one_device(vol->name, MS_RDONLY,
|
|
|
|
&btrfs_fs_type, &fs_devices);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
out:
|
|
|
|
kfree(vol);
|
2008-06-10 10:17:11 +08:00
|
|
|
return ret;
|
2008-03-25 03:02:07 +08:00
|
|
|
}
|
|
|
|
|
2008-01-23 01:46:56 +08:00
|
|
|
static void btrfs_write_super_lockfs(struct super_block *sb)
|
|
|
|
{
|
|
|
|
struct btrfs_root *root = btrfs_sb(sb);
|
|
|
|
btrfs_transaction_flush_work(root);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void btrfs_unlockfs(struct super_block *sb)
|
|
|
|
{
|
|
|
|
struct btrfs_root *root = btrfs_sb(sb);
|
|
|
|
btrfs_transaction_queue_work(root, HZ * 30);
|
|
|
|
}
|
2007-03-21 23:12:56 +08:00
|
|
|
|
2007-03-23 00:13:20 +08:00
|
|
|
static struct super_operations btrfs_super_ops = {
|
2007-03-26 01:44:56 +08:00
|
|
|
.delete_inode = btrfs_delete_inode,
|
2007-03-23 00:13:20 +08:00
|
|
|
.put_super = btrfs_put_super,
|
2007-03-23 22:01:08 +08:00
|
|
|
.write_super = btrfs_write_super,
|
|
|
|
.sync_fs = btrfs_sync_fs,
|
2008-02-21 05:11:05 +08:00
|
|
|
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25)
|
|
|
|
.read_inode = btrfs_read_locked_inode,
|
|
|
|
#else
|
|
|
|
.show_options = generic_show_options,
|
|
|
|
#endif
|
2007-03-27 00:00:39 +08:00
|
|
|
.write_inode = btrfs_write_inode,
|
2007-04-24 23:52:22 +08:00
|
|
|
.dirty_inode = btrfs_dirty_inode,
|
2007-04-02 22:50:19 +08:00
|
|
|
.alloc_inode = btrfs_alloc_inode,
|
|
|
|
.destroy_inode = btrfs_destroy_inode,
|
2007-04-20 09:01:03 +08:00
|
|
|
.statfs = btrfs_statfs,
|
2008-01-23 01:46:56 +08:00
|
|
|
.write_super_lockfs = btrfs_write_super_lockfs,
|
|
|
|
.unlockfs = btrfs_unlockfs,
|
2007-03-23 00:13:20 +08:00
|
|
|
};
|
2008-03-25 03:02:04 +08:00
|
|
|
|
|
|
|
static const struct file_operations btrfs_ctl_fops = {
|
|
|
|
.unlocked_ioctl = btrfs_control_ioctl,
|
|
|
|
.compat_ioctl = btrfs_control_ioctl,
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct miscdevice btrfs_misc = {
|
|
|
|
.minor = MISC_DYNAMIC_MINOR,
|
|
|
|
.name = "btrfs-control",
|
|
|
|
.fops = &btrfs_ctl_fops
|
|
|
|
};
|
|
|
|
|
|
|
|
static int btrfs_interface_init(void)
|
|
|
|
{
|
|
|
|
return misc_register(&btrfs_misc);
|
|
|
|
}
|
|
|
|
|
|
|
|
void btrfs_interface_exit(void)
|
|
|
|
{
|
|
|
|
if (misc_deregister(&btrfs_misc) < 0)
|
|
|
|
printk("misc_deregister failed for control device");
|
|
|
|
}
|
|
|
|
|
2007-03-21 23:12:56 +08:00
|
|
|
static int __init init_btrfs_fs(void)
|
|
|
|
{
|
2007-04-02 22:50:19 +08:00
|
|
|
int err;
|
2007-08-30 03:47:34 +08:00
|
|
|
|
|
|
|
err = btrfs_init_sysfs();
|
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
|
2007-06-09 03:33:54 +08:00
|
|
|
btrfs_init_transaction_sys();
|
2007-06-12 18:35:45 +08:00
|
|
|
err = btrfs_init_cachep();
|
2007-04-02 22:50:19 +08:00
|
|
|
if (err)
|
2007-11-19 23:22:33 +08:00
|
|
|
goto free_transaction_sys;
|
2008-01-25 05:13:08 +08:00
|
|
|
|
|
|
|
err = extent_io_init();
|
2007-11-19 23:22:33 +08:00
|
|
|
if (err)
|
|
|
|
goto free_cachep;
|
|
|
|
|
2008-01-25 05:13:08 +08:00
|
|
|
err = extent_map_init();
|
|
|
|
if (err)
|
|
|
|
goto free_extent_io;
|
|
|
|
|
2008-03-25 03:02:04 +08:00
|
|
|
err = btrfs_interface_init();
|
2007-11-19 23:22:33 +08:00
|
|
|
if (err)
|
|
|
|
goto free_extent_map;
|
2008-03-25 03:02:04 +08:00
|
|
|
err = register_filesystem(&btrfs_fs_type);
|
|
|
|
if (err)
|
|
|
|
goto unregister_ioctl;
|
2007-11-19 23:22:33 +08:00
|
|
|
return 0;
|
|
|
|
|
2008-03-25 03:02:04 +08:00
|
|
|
unregister_ioctl:
|
|
|
|
btrfs_interface_exit();
|
2007-11-19 23:22:33 +08:00
|
|
|
free_extent_map:
|
|
|
|
extent_map_exit();
|
2008-01-25 05:13:08 +08:00
|
|
|
free_extent_io:
|
|
|
|
extent_io_exit();
|
2007-11-19 23:22:33 +08:00
|
|
|
free_cachep:
|
|
|
|
btrfs_destroy_cachep();
|
|
|
|
free_transaction_sys:
|
|
|
|
btrfs_exit_transaction_sys();
|
|
|
|
btrfs_exit_sysfs();
|
|
|
|
return err;
|
2007-03-21 23:12:56 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit exit_btrfs_fs(void)
|
|
|
|
{
|
2007-06-09 03:33:54 +08:00
|
|
|
btrfs_exit_transaction_sys();
|
2007-06-12 18:35:45 +08:00
|
|
|
btrfs_destroy_cachep();
|
2007-08-28 04:49:44 +08:00
|
|
|
extent_map_exit();
|
2008-01-25 05:13:08 +08:00
|
|
|
extent_io_exit();
|
2008-03-25 03:02:04 +08:00
|
|
|
btrfs_interface_exit();
|
2007-03-21 23:12:56 +08:00
|
|
|
unregister_filesystem(&btrfs_fs_type);
|
2007-08-30 03:47:34 +08:00
|
|
|
btrfs_exit_sysfs();
|
2008-03-25 03:02:07 +08:00
|
|
|
btrfs_cleanup_fs_uuids();
|
2007-03-21 23:12:56 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
module_init(init_btrfs_fs)
|
|
|
|
module_exit(exit_btrfs_fs)
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|