+/*
+ * Copyright (C) 2007 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include <linux/blkdev.h>
#include <linux/module.h>
#include <linux/buffer_head.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/smp_lock.h>
#include <linux/backing-dev.h>
+#include <linux/mount.h>
#include <linux/mpage.h>
#include <linux/swap.h>
#include <linux/writeback.h>
#include <linux/statfs.h>
#include <linux/compat.h>
+#include <linux/parser.h>
+#include <linux/ctype.h>
+#include <linux/namei.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
#include "btrfs_inode.h"
#include "ioctl.h"
#include "print-tree.h"
+#include "xattr.h"
-#define BTRFS_SUPER_MAGIC 0x9123682E
+#define BTRFS_SUPER_MAGIC 0x9123683E
static struct super_operations btrfs_super_ops;
static void btrfs_put_super (struct super_block * sb)
{
struct btrfs_root *root = btrfs_sb(sb);
+ struct btrfs_fs_info *fs = root->fs_info;
int ret;
ret = close_ctree(root);
if (ret) {
printk("close ctree returns %d\n", ret);
}
+ btrfs_sysfs_del_super(fs);
sb->s_fs_info = NULL;
}
+enum {
+ Opt_subvol, Opt_nodatasum, Opt_nodatacow, Opt_max_extent,
+ Opt_alloc_start, Opt_nobarrier, Opt_ssd, Opt_err,
+};
+
+static match_table_t tokens = {
+ {Opt_subvol, "subvol=%s"},
+ {Opt_nodatasum, "nodatasum"},
+ {Opt_nodatacow, "nodatacow"},
+ {Opt_nobarrier, "nobarrier"},
+ {Opt_max_extent, "max_extent=%s"},
+ {Opt_alloc_start, "alloc_start=%s"},
+ {Opt_ssd, "ssd"},
+ {Opt_err, NULL}
+};
+
+u64 btrfs_parse_size(char *str)
+{
+ u64 res;
+ int mult = 1;
+ char *end;
+ char last;
+
+ res = simple_strtoul(str, &end, 10);
+
+ last = end[0];
+ if (isalpha(last)) {
+ last = tolower(last);
+ switch (last) {
+ case 'g':
+ mult *= 1024;
+ case 'm':
+ mult *= 1024;
+ case 'k':
+ mult *= 1024;
+ }
+ res = res * mult;
+ }
+ return res;
+}
+
+static int parse_options (char * options,
+ struct btrfs_root *root,
+ char **subvol_name)
+{
+ char * p;
+ struct btrfs_fs_info *info = NULL;
+ substring_t args[MAX_OPT_ARGS];
+
+ if (!options)
+ return 1;
+
+ /*
+ * strsep changes the string, duplicate it because parse_options
+ * gets called twice
+ */
+ options = kstrdup(options, GFP_NOFS);
+ if (!options)
+ return -ENOMEM;
+
+ if (root)
+ info = root->fs_info;
+
+ while ((p = strsep (&options, ",")) != NULL) {
+ int token;
+ if (!*p)
+ continue;
+
+ token = match_token(p, tokens, args);
+ switch (token) {
+ case Opt_subvol:
+ if (subvol_name) {
+ *subvol_name = match_strdup(&args[0]);
+ }
+ break;
+ case Opt_nodatasum:
+ if (info) {
+ printk("btrfs: setting nodatacsum\n");
+ btrfs_set_opt(info->mount_opt, NODATASUM);
+ }
+ break;
+ case Opt_nodatacow:
+ if (info) {
+ printk("btrfs: setting nodatacow\n");
+ btrfs_set_opt(info->mount_opt, NODATACOW);
+ btrfs_set_opt(info->mount_opt, NODATASUM);
+ }
+ break;
+ case Opt_ssd:
+ if (info) {
+ printk("btrfs: use ssd allocation scheme\n");
+ btrfs_set_opt(info->mount_opt, SSD);
+ }
+ break;
+ case Opt_nobarrier:
+ if (info) {
+ printk("btrfs: turning off barriers\n");
+ btrfs_set_opt(info->mount_opt, NOBARRIER);
+ }
+ break;
+ case Opt_max_extent:
+ if (info) {
+ char *num = match_strdup(&args[0]);
+ if (num) {
+ info->max_extent =
+ btrfs_parse_size(num);
+ kfree(num);
+
+ info->max_extent = max_t(u64,
+ info->max_extent,
+ root->sectorsize);
+ printk("btrfs: max_extent at %Lu\n",
+ info->max_extent);
+ }
+ }
+ break;
+ case Opt_alloc_start:
+ if (info) {
+ char *num = match_strdup(&args[0]);
+ if (num) {
+ info->alloc_start =
+ btrfs_parse_size(num);
+ kfree(num);
+ printk("btrfs: allocations start at "
+ "%Lu\n", info->alloc_start);
+ }
+ }
+ break;
+ default:
+ break;
+ }
+ }
+ kfree(options);
+ return 1;
+}
+
static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
{
struct inode * inode;
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_magic = BTRFS_SUPER_MAGIC;
sb->s_op = &btrfs_super_ops;
+ sb->s_xattr = btrfs_xattr_handlers;
sb->s_time_gran = 1;
tree_root = open_ctree(sb);
return -EIO;
}
sb->s_fs_info = tree_root;
- disk_super = tree_root->fs_info->disk_super;
+ disk_super = &tree_root->fs_info->super_copy;
inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super),
tree_root);
bi = BTRFS_I(inode);
bi->location.objectid = inode->i_ino;
bi->location.offset = 0;
- bi->location.flags = 0;
bi->root = tree_root;
+
btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY);
if (!inode) {
err = -ENOMEM;
goto fail_close;
}
+
+ parse_options((char *)data, tree_root, NULL);
+
+ /* this does the super kobj at the same time */
+ err = btrfs_sysfs_add_super(tree_root->fs_info);
+ if (err)
+ goto fail_close;
+
sb->s_root = root_dentry;
btrfs_transaction_queue_work(tree_root, HZ * 30);
return 0;
filemap_flush(root->fs_info->btree_inode->i_mapping);
return 0;
}
+ btrfs_clean_old_snapshots(root);
mutex_lock(&root->fs_info->fs_mutex);
+ btrfs_defrag_dirty_roots(root->fs_info);
trans = btrfs_start_transaction(root, 1);
ret = btrfs_commit_transaction(trans, root);
sb->s_dirt = 0;
- BUG_ON(ret);
mutex_unlock(&root->fs_info->fs_mutex);
- return 0;
+ return ret;
}
static void btrfs_write_super(struct super_block *sb)
sb->s_dirt = 0;
}
+/*
+ * This is almost a copy of get_sb_bdev in fs/super.c.
+ * We need the local copy to allow direct mounting of
+ * subvolumes, but this could be easily integrated back
+ * into the generic version. --hch
+ */
+
+/* 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;
+
+ bdev = open_bdev_excl(dev_name, flags, fs_type);
+ if (IS_ERR(bdev))
+ return PTR_ERR(bdev);
+
+ /*
+ * 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);
+ s = sget(fs_type, test_bdev_super, set_bdev_super, bdev);
+ 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 */
+
static int btrfs_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
- return get_sb_bdev(fs_type, flags, dev_name, data,
- btrfs_fill_super, mnt);
+ int ret;
+ char *subvol_name = NULL;
+
+ parse_options((char *)data, NULL, &subvol_name);
+ ret = btrfs_get_sb_bdev(fs_type, flags, dev_name, data,
+ btrfs_fill_super, mnt,
+ subvol_name ? subvol_name : "default");
+ if (subvol_name)
+ kfree(subvol_name);
+ return ret;
}
static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct btrfs_root *root = btrfs_sb(dentry->d_sb);
- struct btrfs_super_block *disk_super = root->fs_info->disk_super;
+ struct btrfs_super_block *disk_super = &root->fs_info->super_copy;
+ int bits = dentry->d_sb->s_blocksize_bits;
buf->f_namelen = BTRFS_NAME_LEN;
- buf->f_blocks = btrfs_super_total_blocks(disk_super);
- buf->f_bfree = buf->f_blocks - btrfs_super_blocks_used(disk_super);
+ buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits;
+ buf->f_bfree = buf->f_blocks -
+ (btrfs_super_bytes_used(disk_super) >> bits);
buf->f_bavail = buf->f_bfree;
buf->f_bsize = dentry->d_sb->s_blocksize;
buf->f_type = BTRFS_SUPER_MAGIC;
.kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV,
};
+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);
+}
static struct super_operations btrfs_super_ops = {
.delete_inode = btrfs_delete_inode,
+ .put_inode = btrfs_put_inode,
.put_super = btrfs_put_super,
.read_inode = btrfs_read_locked_inode,
.write_super = btrfs_write_super,
.alloc_inode = btrfs_alloc_inode,
.destroy_inode = btrfs_destroy_inode,
.statfs = btrfs_statfs,
+ .write_super_lockfs = btrfs_write_super_lockfs,
+ .unlockfs = btrfs_unlockfs,
};
-
static int __init init_btrfs_fs(void)
{
int err;
+
+ err = btrfs_init_sysfs();
+ if (err)
+ return err;
+
btrfs_init_transaction_sys();
err = btrfs_init_cachep();
if (err)
- return err;
- return register_filesystem(&btrfs_fs_type);
+ goto free_transaction_sys;
+
+ err = extent_io_init();
+ if (err)
+ goto free_cachep;
+
+ err = extent_map_init();
+ if (err)
+ goto free_extent_io;
+
+ err = register_filesystem(&btrfs_fs_type);
+ if (err)
+ goto free_extent_map;
+ return 0;
+
+free_extent_map:
+ extent_map_exit();
+free_extent_io:
+ extent_io_exit();
+free_cachep:
+ btrfs_destroy_cachep();
+free_transaction_sys:
+ btrfs_exit_transaction_sys();
+ btrfs_exit_sysfs();
+ return err;
}
static void __exit exit_btrfs_fs(void)
{
btrfs_exit_transaction_sys();
btrfs_destroy_cachep();
+ extent_map_exit();
+ extent_io_exit();
unregister_filesystem(&btrfs_fs_type);
+ btrfs_exit_sysfs();
}
module_init(init_btrfs_fs)
projects / mirror_ubuntu-artful-kernel.git / blobdiff