+/*
+ * 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 <linux/miscdevice.h>
+#include <linux/magic.h>
+#include "compat.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"
+#include "volumes.h"
+#include "version.h"
+#include "export.h"
+#include "compression.h"
-void btrfs_fsinfo_release(struct kobject *obj)
-{
- struct btrfs_fs_info *fsinfo = container_of(obj,
- struct btrfs_fs_info, kobj);
- kfree(fsinfo);
-}
-
-struct kobj_type btrfs_fsinfo_ktype = {
- .release = btrfs_fsinfo_release,
-};
-
-struct btrfs_iget_args {
- u64 ino;
- struct btrfs_root *root;
-};
-
-decl_subsys(btrfs, &btrfs_fsinfo_ktype, NULL);
-#define BTRFS_SUPER_MAGIC 0x9123682E
-
-static struct inode_operations btrfs_dir_inode_operations;
-static struct inode_operations btrfs_dir_ro_inode_operations;
static struct super_operations btrfs_super_ops;
-static struct file_operations btrfs_dir_file_operations;
-static struct inode_operations btrfs_file_inode_operations;
-static struct address_space_operations btrfs_aops;
-static struct file_operations btrfs_file_operations;
-
-static void btrfs_read_locked_inode(struct inode *inode)
-{
- struct btrfs_path *path;
- struct btrfs_inode_item *inode_item;
- struct btrfs_root *root = BTRFS_I(inode)->root;
- struct btrfs_key location;
- struct btrfs_block_group_cache *alloc_group;
- u64 alloc_group_block;
- int ret;
-
- path = btrfs_alloc_path();
- BUG_ON(!path);
- btrfs_init_path(path);
- mutex_lock(&root->fs_info->fs_mutex);
-
- memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
- ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
- if (ret) {
- btrfs_free_path(path);
- goto make_bad;
- }
- inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
- path->slots[0],
- struct btrfs_inode_item);
-
- inode->i_mode = btrfs_inode_mode(inode_item);
- inode->i_nlink = btrfs_inode_nlink(inode_item);
- inode->i_uid = btrfs_inode_uid(inode_item);
- inode->i_gid = btrfs_inode_gid(inode_item);
- inode->i_size = btrfs_inode_size(inode_item);
- inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime);
- inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime);
- inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime);
- inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime);
- inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime);
- inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime);
- inode->i_blocks = btrfs_inode_nblocks(inode_item);
- inode->i_generation = btrfs_inode_generation(inode_item);
- alloc_group_block = btrfs_inode_block_group(inode_item);
- ret = radix_tree_gang_lookup(&root->fs_info->block_group_radix,
- (void **)&alloc_group,
- alloc_group_block, 1);
- BUG_ON(!ret);
- BTRFS_I(inode)->block_group = alloc_group;
-
- btrfs_free_path(path);
- inode_item = NULL;
-
- mutex_unlock(&root->fs_info->fs_mutex);
-
- switch (inode->i_mode & S_IFMT) {
-#if 0
- default:
- init_special_inode(inode, inode->i_mode,
- btrfs_inode_rdev(inode_item));
- break;
-#endif
- case S_IFREG:
- inode->i_mapping->a_ops = &btrfs_aops;
- inode->i_fop = &btrfs_file_operations;
- inode->i_op = &btrfs_file_inode_operations;
- break;
- case S_IFDIR:
- inode->i_fop = &btrfs_dir_file_operations;
- if (root == root->fs_info->tree_root)
- inode->i_op = &btrfs_dir_ro_inode_operations;
- else
- inode->i_op = &btrfs_dir_inode_operations;
- break;
- case S_IFLNK:
- // inode->i_op = &page_symlink_inode_operations;
- break;
- }
- return;
-
-make_bad:
- btrfs_release_path(root, path);
- btrfs_free_path(path);
- mutex_unlock(&root->fs_info->fs_mutex);
- make_bad_inode(inode);
-}
-
-static void fill_inode_item(struct btrfs_inode_item *item,
- struct inode *inode)
-{
- btrfs_set_inode_uid(item, inode->i_uid);
- btrfs_set_inode_gid(item, inode->i_gid);
- btrfs_set_inode_size(item, inode->i_size);
- btrfs_set_inode_mode(item, inode->i_mode);
- btrfs_set_inode_nlink(item, inode->i_nlink);
- btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec);
- btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec);
- btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec);
- btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec);
- btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec);
- btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec);
- btrfs_set_inode_nblocks(item, inode->i_blocks);
- btrfs_set_inode_generation(item, inode->i_generation);
- btrfs_set_inode_block_group(item,
- BTRFS_I(inode)->block_group->key.objectid);
-}
-
-static int btrfs_update_inode(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct inode *inode)
+static void btrfs_put_super(struct super_block *sb)
{
- struct btrfs_inode_item *inode_item;
- struct btrfs_path *path;
+ struct btrfs_root *root = btrfs_sb(sb);
int ret;
- path = btrfs_alloc_path();
- BUG_ON(!path);
- btrfs_init_path(path);
- ret = btrfs_lookup_inode(trans, root, path,
- &BTRFS_I(inode)->location, 1);
- if (ret) {
- if (ret > 0)
- ret = -ENOENT;
- goto failed;
- }
-
- inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
- path->slots[0],
- struct btrfs_inode_item);
-
- fill_inode_item(inode_item, inode);
- btrfs_mark_buffer_dirty(path->nodes[0]);
- ret = 0;
-failed:
- btrfs_release_path(root, path);
- btrfs_free_path(path);
- return ret;
+ ret = close_ctree(root);
+ sb->s_fs_info = NULL;
}
+enum {
+ Opt_degraded, Opt_subvol, Opt_device, Opt_nodatasum, Opt_nodatacow,
+ Opt_max_extent, Opt_max_inline, Opt_alloc_start, Opt_nobarrier,
+ Opt_ssd, Opt_thread_pool, Opt_noacl, Opt_compress, Opt_err,
+};
-static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct inode *dir,
- struct dentry *dentry)
-{
- struct btrfs_path *path;
- const char *name = dentry->d_name.name;
- int name_len = dentry->d_name.len;
- int ret = 0;
- u64 objectid;
- struct btrfs_dir_item *di;
-
- path = btrfs_alloc_path();
- BUG_ON(!path);
- btrfs_init_path(path);
- di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
- name, name_len, -1);
- if (IS_ERR(di)) {
- ret = PTR_ERR(di);
- goto err;
- }
- if (!di) {
- ret = -ENOENT;
- goto err;
- }
- objectid = btrfs_disk_key_objectid(&di->location);
- ret = btrfs_delete_one_dir_name(trans, root, path, di);
- BUG_ON(ret);
- btrfs_release_path(root, path);
-
- di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
- objectid, name, name_len, -1);
- if (IS_ERR(di)) {
- ret = PTR_ERR(di);
- goto err;
- }
- if (!di) {
- ret = -ENOENT;
- goto err;
- }
- ret = btrfs_delete_one_dir_name(trans, root, path, di);
- BUG_ON(ret);
-
- dentry->d_inode->i_ctime = dir->i_ctime;
-err:
- btrfs_free_path(path);
- if (!ret) {
- dir->i_size -= name_len * 2;
- btrfs_update_inode(trans, root, dir);
- drop_nlink(dentry->d_inode);
- btrfs_update_inode(trans, root, dentry->d_inode);
- dir->i_sb->s_dirt = 1;
- }
- return ret;
-}
+static match_table_t tokens = {
+ {Opt_degraded, "degraded"},
+ {Opt_subvol, "subvol=%s"},
+ {Opt_device, "device=%s"},
+ {Opt_nodatasum, "nodatasum"},
+ {Opt_nodatacow, "nodatacow"},
+ {Opt_nobarrier, "nobarrier"},
+ {Opt_max_extent, "max_extent=%s"},
+ {Opt_max_inline, "max_inline=%s"},
+ {Opt_alloc_start, "alloc_start=%s"},
+ {Opt_thread_pool, "thread_pool=%d"},
+ {Opt_compress, "compress"},
+ {Opt_ssd, "ssd"},
+ {Opt_noacl, "noacl"},
+ {Opt_err, NULL},
+};
-static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
+u64 btrfs_parse_size(char *str)
{
- struct btrfs_root *root;
- struct btrfs_trans_handle *trans;
- int ret;
+ u64 res;
+ int mult = 1;
+ char *end;
+ char last;
- root = BTRFS_I(dir)->root;
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, dir);
- ret = btrfs_unlink_trans(trans, root, dir, dentry);
- btrfs_end_transaction(trans, root);
- mutex_unlock(&root->fs_info->fs_mutex);
- return ret;
-}
+ res = simple_strtoul(str, &end, 10);
-static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
-{
- struct inode *inode = dentry->d_inode;
- int err;
- int ret;
- struct btrfs_root *root = BTRFS_I(dir)->root;
- struct btrfs_path *path;
- struct btrfs_key key;
- struct btrfs_trans_handle *trans;
- struct btrfs_key found_key;
- int found_type;
- struct btrfs_leaf *leaf;
- char *goodnames = "..";
-
- path = btrfs_alloc_path();
- BUG_ON(!path);
- btrfs_init_path(path);
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, dir);
- key.objectid = inode->i_ino;
- key.offset = (u64)-1;
- key.flags = (u32)-1;
- while(1) {
- ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
- if (ret < 0) {
- err = ret;
- goto out;
- }
- BUG_ON(ret == 0);
- if (path->slots[0] == 0) {
- err = -ENOENT;
- goto out;
- }
- path->slots[0]--;
- leaf = btrfs_buffer_leaf(path->nodes[0]);
- btrfs_disk_key_to_cpu(&found_key,
- &leaf->items[path->slots[0]].key);
- found_type = btrfs_key_type(&found_key);
- if (found_key.objectid != inode->i_ino) {
- err = -ENOENT;
- goto out;
+ last = end[0];
+ if (isalpha(last)) {
+ last = tolower(last);
+ switch (last) {
+ case 'g':
+ mult *= 1024;
+ case 'm':
+ mult *= 1024;
+ case 'k':
+ mult *= 1024;
}
- if ((found_type != BTRFS_DIR_ITEM_KEY &&
- found_type != BTRFS_DIR_INDEX_KEY) ||
- (!btrfs_match_dir_item_name(root, path, goodnames, 2) &&
- !btrfs_match_dir_item_name(root, path, goodnames, 1))) {
- err = -ENOTEMPTY;
- goto out;
- }
- ret = btrfs_del_item(trans, root, path);
- BUG_ON(ret);
-
- if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1)
- break;
- btrfs_release_path(root, path);
- }
- ret = 0;
- btrfs_release_path(root, path);
-
- /* now the directory is empty */
- err = btrfs_unlink_trans(trans, root, dir, dentry);
- if (!err) {
- inode->i_size = 0;
+ res = res * mult;
}
-out:
- btrfs_release_path(root, path);
- btrfs_free_path(path);
- mutex_unlock(&root->fs_info->fs_mutex);
- ret = btrfs_end_transaction(trans, root);
- if (ret && !err)
- err = ret;
- return err;
+ return res;
}
-static int btrfs_free_inode(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct inode *inode)
+/*
+ * Regular mount options parser. Everything that is needed only when
+ * reading in a new superblock is parsed here.
+ */
+int btrfs_parse_options(struct btrfs_root *root, char *options)
{
- struct btrfs_path *path;
- int ret;
+ struct btrfs_fs_info *info = root->fs_info;
+ substring_t args[MAX_OPT_ARGS];
+ char *p, *num;
+ int intarg;
- clear_inode(inode);
-
- path = btrfs_alloc_path();
- BUG_ON(!path);
- btrfs_init_path(path);
- ret = btrfs_lookup_inode(trans, root, path,
- &BTRFS_I(inode)->location, -1);
- BUG_ON(ret);
- ret = btrfs_del_item(trans, root, path);
- BUG_ON(ret);
- btrfs_free_path(path);
- return ret;
-}
+ if (!options)
+ return 0;
-static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct inode *inode)
-{
- int ret;
- struct btrfs_path *path;
- struct btrfs_key key;
- struct btrfs_disk_key *found_key;
- struct btrfs_leaf *leaf;
- struct btrfs_file_extent_item *fi = NULL;
- u64 extent_start = 0;
- u64 extent_num_blocks = 0;
- int found_extent;
-
- path = btrfs_alloc_path();
- BUG_ON(!path);
- /* FIXME, add redo link to tree so we don't leak on crash */
- key.objectid = inode->i_ino;
- key.offset = (u64)-1;
- key.flags = 0;
/*
- * use BTRFS_CSUM_ITEM_KEY because it is larger than inline keys
- * or extent data
+ * strsep changes the string, duplicate it because parse_options
+ * gets called twice
*/
- btrfs_set_key_type(&key, BTRFS_CSUM_ITEM_KEY);
- while(1) {
- btrfs_init_path(path);
- ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
- if (ret < 0) {
- goto error;
- }
- if (ret > 0) {
- BUG_ON(path->slots[0] == 0);
- path->slots[0]--;
- }
- leaf = btrfs_buffer_leaf(path->nodes[0]);
- found_key = &leaf->items[path->slots[0]].key;
- if (btrfs_disk_key_objectid(found_key) != inode->i_ino)
+ options = kstrdup(options, GFP_NOFS);
+ if (!options)
+ return -ENOMEM;
+
+
+ while ((p = strsep(&options, ",")) != NULL) {
+ int token;
+ if (!*p)
+ continue;
+
+ token = match_token(p, tokens, args);
+ switch (token) {
+ case Opt_degraded:
+ printk(KERN_INFO "btrfs: allowing degraded mounts\n");
+ btrfs_set_opt(info->mount_opt, DEGRADED);
+ break;
+ case Opt_subvol:
+ case Opt_device:
+ /*
+ * These are parsed by btrfs_parse_early_options
+ * and can be happily ignored here.
+ */
+ break;
+ case Opt_nodatasum:
+ printk(KERN_INFO "btrfs: setting nodatacsum\n");
+ btrfs_set_opt(info->mount_opt, NODATASUM);
+ break;
+ case Opt_nodatacow:
+ printk(KERN_INFO "btrfs: setting nodatacow\n");
+ btrfs_set_opt(info->mount_opt, NODATACOW);
+ btrfs_set_opt(info->mount_opt, NODATASUM);
+ break;
+ case Opt_compress:
+ printk(KERN_INFO "btrfs: use compression\n");
+ btrfs_set_opt(info->mount_opt, COMPRESS);
break;
- if (btrfs_disk_key_type(found_key) != BTRFS_CSUM_ITEM_KEY &&
- btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY)
+ case Opt_ssd:
+ printk(KERN_INFO "btrfs: use ssd allocation scheme\n");
+ btrfs_set_opt(info->mount_opt, SSD);
break;
- if (btrfs_disk_key_offset(found_key) < inode->i_size)
+ case Opt_nobarrier:
+ printk(KERN_INFO "btrfs: turning off barriers\n");
+ btrfs_set_opt(info->mount_opt, NOBARRIER);
break;
- found_extent = 0;
- if (btrfs_disk_key_type(found_key) == BTRFS_EXTENT_DATA_KEY) {
- fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
- path->slots[0],
- struct btrfs_file_extent_item);
- if (btrfs_file_extent_type(fi) !=
- BTRFS_FILE_EXTENT_INLINE) {
- extent_start =
- btrfs_file_extent_disk_blocknr(fi);
- extent_num_blocks =
- btrfs_file_extent_disk_num_blocks(fi);
- /* FIXME blocksize != 4096 */
- inode->i_blocks -=
- btrfs_file_extent_num_blocks(fi) << 3;
- found_extent = 1;
+ case Opt_thread_pool:
+ intarg = 0;
+ match_int(&args[0], &intarg);
+ if (intarg) {
+ info->thread_pool_size = intarg;
+ printk(KERN_INFO "btrfs: thread pool %d\n",
+ info->thread_pool_size);
}
+ break;
+ case Opt_max_extent:
+ 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(KERN_INFO "btrfs: max_extent at %llu\n",
+ info->max_extent);
+ }
+ break;
+ case Opt_max_inline:
+ num = match_strdup(&args[0]);
+ if (num) {
+ info->max_inline = btrfs_parse_size(num);
+ kfree(num);
+
+ if (info->max_inline) {
+ info->max_inline = max_t(u64,
+ info->max_inline,
+ root->sectorsize);
+ }
+ printk(KERN_INFO "btrfs: max_inline at %llu\n",
+ info->max_inline);
+ }
+ break;
+ case Opt_alloc_start:
+ num = match_strdup(&args[0]);
+ if (num) {
+ info->alloc_start = btrfs_parse_size(num);
+ kfree(num);
+ printk(KERN_INFO
+ "btrfs: allocations start at %llu\n",
+ info->alloc_start);
+ }
+ break;
+ case Opt_noacl:
+ root->fs_info->sb->s_flags &= ~MS_POSIXACL;
+ break;
+ default:
+ break;
}
- ret = btrfs_del_item(trans, root, path);
- BUG_ON(ret);
- btrfs_release_path(root, path);
- if (found_extent) {
- ret = btrfs_free_extent(trans, root, extent_start,
- extent_num_blocks, 0);
- BUG_ON(ret);
- }
- }
- ret = 0;
-error:
- btrfs_release_path(root, path);
- btrfs_free_path(path);
- inode->i_sb->s_dirt = 1;
- return ret;
-}
-
-static void btrfs_delete_inode(struct inode *inode)
-{
- struct btrfs_trans_handle *trans;
- struct btrfs_root *root = BTRFS_I(inode)->root;
- int ret;
-
- truncate_inode_pages(&inode->i_data, 0);
- if (is_bad_inode(inode)) {
- goto no_delete;
- }
- inode->i_size = 0;
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, inode);
- if (S_ISREG(inode->i_mode)) {
- ret = btrfs_truncate_in_trans(trans, root, inode);
- BUG_ON(ret);
}
- btrfs_free_inode(trans, root, inode);
- btrfs_end_transaction(trans, root);
- mutex_unlock(&root->fs_info->fs_mutex);
- return;
-no_delete:
- clear_inode(inode);
-}
-
-static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
- struct btrfs_key *location)
-{
- const char *name = dentry->d_name.name;
- int namelen = dentry->d_name.len;
- struct btrfs_dir_item *di;
- struct btrfs_path *path;
- struct btrfs_root *root = BTRFS_I(dir)->root;
- int ret;
-
- path = btrfs_alloc_path();
- BUG_ON(!path);
- btrfs_init_path(path);
- di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
- namelen, 0);
- if (!di || IS_ERR(di)) {
- location->objectid = 0;
- ret = 0;
- goto out;
- }
- btrfs_disk_key_to_cpu(location, &di->location);
-out:
- btrfs_release_path(root, path);
- btrfs_free_path(path);
- return ret;
-}
-
-int fixup_tree_root_location(struct btrfs_root *root,
- struct btrfs_key *location,
- struct btrfs_root **sub_root)
-{
- struct btrfs_path *path;
- struct btrfs_root_item *ri;
-
- if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
- return 0;
- if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
- return 0;
-
- path = btrfs_alloc_path();
- BUG_ON(!path);
- mutex_lock(&root->fs_info->fs_mutex);
-
- *sub_root = btrfs_read_fs_root(root->fs_info, location);
- if (IS_ERR(*sub_root))
- return PTR_ERR(*sub_root);
-
- ri = &(*sub_root)->root_item;
- location->objectid = btrfs_root_dirid(ri);
- location->flags = 0;
- btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
- location->offset = 0;
-
- btrfs_free_path(path);
- mutex_unlock(&root->fs_info->fs_mutex);
- return 0;
-}
-
-int btrfs_init_locked_inode(struct inode *inode, void *p)
-{
- struct btrfs_iget_args *args = p;
- inode->i_ino = args->ino;
- BTRFS_I(inode)->root = args->root;
+ kfree(options);
return 0;
}
-int btrfs_find_actor(struct inode *inode, void *opaque)
+/*
+ * Parse mount options that are required early in the mount process.
+ *
+ * All other options will be parsed on much later in the mount process and
+ * only when we need to allocate a new super block.
+ */
+static int btrfs_parse_early_options(const char *options, fmode_t flags,
+ void *holder, char **subvol_name,
+ struct btrfs_fs_devices **fs_devices)
{
- struct btrfs_iget_args *args = opaque;
- return (args->ino == inode->i_ino &&
- args->root == BTRFS_I(inode)->root);
-}
+ substring_t args[MAX_OPT_ARGS];
+ char *opts, *p;
+ int error = 0;
-struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
- struct btrfs_root *root)
-{
- struct inode *inode;
- struct btrfs_iget_args args;
- args.ino = objectid;
- args.root = root;
-
- inode = iget5_locked(s, objectid, btrfs_find_actor,
- btrfs_init_locked_inode,
- (void *)&args);
- return inode;
-}
+ if (!options)
+ goto out;
-static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
- struct nameidata *nd)
-{
- struct inode * inode;
- struct btrfs_inode *bi = BTRFS_I(dir);
- struct btrfs_root *root = bi->root;
- struct btrfs_root *sub_root = root;
- struct btrfs_key location;
- int ret;
+ /*
+ * strsep changes the string, duplicate it because parse_options
+ * gets called twice
+ */
+ opts = kstrdup(options, GFP_KERNEL);
+ if (!opts)
+ return -ENOMEM;
- if (dentry->d_name.len > BTRFS_NAME_LEN)
- return ERR_PTR(-ENAMETOOLONG);
- mutex_lock(&root->fs_info->fs_mutex);
- ret = btrfs_inode_by_name(dir, dentry, &location);
- mutex_unlock(&root->fs_info->fs_mutex);
- if (ret < 0)
- return ERR_PTR(ret);
- inode = NULL;
- if (location.objectid) {
- ret = fixup_tree_root_location(root, &location, &sub_root);
- if (ret < 0)
- return ERR_PTR(ret);
- if (ret > 0)
- return ERR_PTR(-ENOENT);
- inode = btrfs_iget_locked(dir->i_sb, location.objectid,
- sub_root);
- if (!inode)
- return ERR_PTR(-EACCES);
- if (inode->i_state & I_NEW) {
- if (sub_root != root) {
-printk("adding new root for inode %lu root %p (found %p)\n", inode->i_ino, sub_root, BTRFS_I(inode)->root);
- igrab(inode);
- sub_root->inode = inode;
- }
- BTRFS_I(inode)->root = sub_root;
- memcpy(&BTRFS_I(inode)->location, &location,
- sizeof(location));
- btrfs_read_locked_inode(inode);
- unlock_new_inode(inode);
- }
- }
- return d_splice_alias(inode, dentry);
-}
+ while ((p = strsep(&opts, ",")) != NULL) {
+ int token;
+ if (!*p)
+ continue;
-static void reada_leaves(struct btrfs_root *root, struct btrfs_path *path)
-{
- struct btrfs_node *node;
- int i;
- int nritems;
- u64 objectid;
- u64 item_objectid;
- u64 blocknr;
- int slot;
-
- if (!path->nodes[1])
- return;
- node = btrfs_buffer_node(path->nodes[1]);
- slot = path->slots[1];
- objectid = btrfs_disk_key_objectid(&node->ptrs[slot].key);
- nritems = btrfs_header_nritems(&node->header);
- for (i = slot; i < nritems; i++) {
- item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key);
- if (item_objectid != objectid)
+ token = match_token(p, tokens, args);
+ switch (token) {
+ case Opt_subvol:
+ *subvol_name = match_strdup(&args[0]);
break;
- blocknr = btrfs_node_blockptr(node, i);
- readahead_tree_block(root, blocknr);
- }
-}
-
-static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
-{
- struct inode *inode = filp->f_path.dentry->d_inode;
- struct btrfs_root *root = BTRFS_I(inode)->root;
- struct btrfs_item *item;
- struct btrfs_dir_item *di;
- struct btrfs_key key;
- struct btrfs_path *path;
- int ret;
- u32 nritems;
- struct btrfs_leaf *leaf;
- int slot;
- int advance;
- unsigned char d_type = DT_UNKNOWN;
- int over = 0;
- u32 di_cur;
- u32 di_total;
- u32 di_len;
- int key_type = BTRFS_DIR_INDEX_KEY;
-
- /* FIXME, use a real flag for deciding about the key type */
- if (root->fs_info->tree_root == root)
- key_type = BTRFS_DIR_ITEM_KEY;
- mutex_lock(&root->fs_info->fs_mutex);
- key.objectid = inode->i_ino;
- key.flags = 0;
- btrfs_set_key_type(&key, key_type);
- key.offset = filp->f_pos;
- path = btrfs_alloc_path();
- btrfs_init_path(path);
- ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
- if (ret < 0)
- goto err;
- advance = 0;
- reada_leaves(root, path);
- while(1) {
- leaf = btrfs_buffer_leaf(path->nodes[0]);
- nritems = btrfs_header_nritems(&leaf->header);
- slot = path->slots[0];
- if (advance || slot >= nritems) {
- if (slot >= nritems -1) {
- ret = btrfs_next_leaf(root, path);
- if (ret)
- break;
- leaf = btrfs_buffer_leaf(path->nodes[0]);
- nritems = btrfs_header_nritems(&leaf->header);
- slot = path->slots[0];
- if (path->slots[1] == 0)
- reada_leaves(root, path);
- } else {
- slot++;
- path->slots[0]++;
- }
- }
- advance = 1;
- item = leaf->items + slot;
- if (btrfs_disk_key_objectid(&item->key) != key.objectid)
+ case Opt_device:
+ error = btrfs_scan_one_device(match_strdup(&args[0]),
+ flags, holder, fs_devices);
+ if (error)
+ goto out_free_opts;
break;
- if (btrfs_disk_key_type(&item->key) != key_type)
+ default:
break;
- if (btrfs_disk_key_offset(&item->key) < filp->f_pos)
- continue;
- filp->f_pos = btrfs_disk_key_offset(&item->key);
- advance = 1;
- di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
- di_cur = 0;
- di_total = btrfs_item_size(leaf->items + slot);
- while(di_cur < di_total) {
- over = filldir(dirent, (const char *)(di + 1),
- btrfs_dir_name_len(di),
- btrfs_disk_key_offset(&item->key),
- btrfs_disk_key_objectid(&di->location),
- d_type);
- if (over)
- goto nopos;
- di_len = btrfs_dir_name_len(di) + sizeof(*di);
- di_cur += di_len;
- di = (struct btrfs_dir_item *)((char *)di + di_len);
}
}
- filp->f_pos++;
-nopos:
- ret = 0;
-err:
- btrfs_release_path(root, path);
- btrfs_free_path(path);
- mutex_unlock(&root->fs_info->fs_mutex);
- return ret;
-}
-
-static void btrfs_put_super (struct super_block * sb)
-{
- struct btrfs_root *root = btrfs_sb(sb);
- int ret;
- ret = close_ctree(root);
- if (ret) {
- printk("close ctree returns %d\n", ret);
+ out_free_opts:
+ kfree(opts);
+ out:
+ /*
+ * If no subvolume name is specified we use the default one. Allocate
+ * a copy of the string "." here so that code later in the
+ * mount path doesn't care if it's the default volume or another one.
+ */
+ if (!*subvol_name) {
+ *subvol_name = kstrdup(".", GFP_KERNEL);
+ if (!*subvol_name)
+ return -ENOMEM;
}
- sb->s_fs_info = NULL;
+ return error;
}
-static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
+static int btrfs_fill_super(struct super_block *sb,
+ struct btrfs_fs_devices *fs_devices,
+ void *data, int silent)
{
- struct inode * inode;
- struct dentry * root_dentry;
+ struct inode *inode;
+ struct dentry *root_dentry;
struct btrfs_super_block *disk_super;
struct btrfs_root *tree_root;
struct btrfs_inode *bi;
+ int err;
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_magic = BTRFS_SUPER_MAGIC;
sb->s_op = &btrfs_super_ops;
+ sb->s_export_op = &btrfs_export_ops;
+ sb->s_xattr = btrfs_xattr_handlers;
sb->s_time_gran = 1;
+ sb->s_flags |= MS_POSIXACL;
- tree_root = open_ctree(sb);
+ tree_root = open_ctree(sb, fs_devices, (char *)data);
- if (!tree_root) {
+ if (IS_ERR(tree_root)) {
printk("btrfs: open_ctree failed\n");
- return -EIO;
+ return PTR_ERR(tree_root);
}
sb->s_fs_info = tree_root;
- disk_super = tree_root->fs_info->disk_super;
- printk("read in super total blocks %Lu root %Lu\n",
- btrfs_super_total_blocks(disk_super),
- btrfs_super_root_dir(disk_super));
-
- inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super),
- tree_root);
+ disk_super = &tree_root->fs_info->super_copy;
+ inode = btrfs_iget_locked(sb, BTRFS_FIRST_FREE_OBJECTID,
+ tree_root->fs_info->fs_root);
bi = BTRFS_I(inode);
bi->location.objectid = inode->i_ino;
bi->location.offset = 0;
- bi->location.flags = 0;
- bi->root = tree_root;
+ bi->root = tree_root->fs_info->fs_root;
+
btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY);
- if (!inode)
- return -ENOMEM;
+ if (!inode) {
+ err = -ENOMEM;
+ goto fail_close;
+ }
if (inode->i_state & I_NEW) {
btrfs_read_locked_inode(inode);
unlock_new_inode(inode);
root_dentry = d_alloc_root(inode);
if (!root_dentry) {
iput(inode);
- return -ENOMEM;
+ err = -ENOMEM;
+ goto fail_close;
}
+#if 0
+ /* this does the super kobj at the same time */
+ err = btrfs_sysfs_add_super(tree_root->fs_info);
+ if (err)
+ goto fail_close;
+#endif
+
sb->s_root = root_dentry;
+ save_mount_options(sb, data);
return 0;
+
+fail_close:
+ close_ctree(tree_root);
+ return err;
}
-static int btrfs_write_inode(struct inode *inode, int wait)
+int btrfs_sync_fs(struct super_block *sb, int wait)
{
- struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans;
- int ret = 0;
-
- if (wait) {
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, inode);
- ret = btrfs_commit_transaction(trans, root);
- mutex_unlock(&root->fs_info->fs_mutex);
+ struct btrfs_root *root;
+ int ret;
+ root = btrfs_sb(sb);
+
+ if (sb->s_flags & MS_RDONLY)
+ return 0;
+
+ sb->s_dirt = 0;
+ if (!wait) {
+ filemap_flush(root->fs_info->btree_inode->i_mapping);
+ return 0;
}
- return ret;
-}
-static void btrfs_dirty_inode(struct inode *inode)
-{
- struct btrfs_root *root = BTRFS_I(inode)->root;
- struct btrfs_trans_handle *trans;
+ btrfs_start_delalloc_inodes(root);
+ btrfs_wait_ordered_extents(root, 0);
- mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, inode);
- btrfs_update_inode(trans, root, inode);
- btrfs_end_transaction(trans, root);
- mutex_unlock(&root->fs_info->fs_mutex);
+ ret = btrfs_commit_transaction(trans, root);
+ sb->s_dirt = 0;
+ return ret;
}
-static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- u64 objectid,
- struct btrfs_block_group_cache *group,
- int mode)
+static void btrfs_write_super(struct super_block *sb)
{
- struct inode *inode;
- struct btrfs_inode_item inode_item;
- struct btrfs_key *location;
- int ret;
-
- inode = new_inode(root->fs_info->sb);
- if (!inode)
- return ERR_PTR(-ENOMEM);
-
- BTRFS_I(inode)->root = root;
- group = btrfs_find_block_group(root, group, 0);
- BTRFS_I(inode)->block_group = group;
-
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
- inode->i_mode = mode;
- inode->i_ino = objectid;
- inode->i_blocks = 0;
- inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
- fill_inode_item(&inode_item, inode);
- location = &BTRFS_I(inode)->location;
- location->objectid = objectid;
- location->flags = 0;
- location->offset = 0;
- btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
-
- ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
- BUG_ON(ret);
-
- insert_inode_hash(inode);
- return inode;
+ sb->s_dirt = 0;
}
-static int btrfs_add_link(struct btrfs_trans_handle *trans,
- struct dentry *dentry, struct inode *inode)
+static int btrfs_test_super(struct super_block *s, void *data)
{
- int ret;
- struct btrfs_key key;
- struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
- key.objectid = inode->i_ino;
- key.flags = 0;
- btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
- key.offset = 0;
-
- ret = btrfs_insert_dir_item(trans, root,
- dentry->d_name.name, dentry->d_name.len,
- dentry->d_parent->d_inode->i_ino,
- &key, 0);
- if (ret == 0) {
- dentry->d_parent->d_inode->i_size += dentry->d_name.len * 2;
- ret = btrfs_update_inode(trans, root,
- dentry->d_parent->d_inode);
- }
- return ret;
-}
+ struct btrfs_fs_devices *test_fs_devices = data;
+ struct btrfs_root *root = btrfs_sb(s);
-static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
- struct dentry *dentry, struct inode *inode)
-{
- int err = btrfs_add_link(trans, dentry, inode);
- if (!err) {
- d_instantiate(dentry, inode);
- return 0;
- }
- if (err > 0)
- err = -EEXIST;
- return err;
+ return root->fs_info->fs_devices == test_fs_devices;
}
-static int btrfs_create(struct inode *dir, struct dentry *dentry,
- int mode, struct nameidata *nd)
+/*
+ * 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)
{
- struct btrfs_trans_handle *trans;
- struct btrfs_root *root = BTRFS_I(dir)->root;
- struct inode *inode;
- int err;
- int drop_inode = 0;
- u64 objectid;
+ char *subvol_name = NULL;
+ struct block_device *bdev = NULL;
+ struct super_block *s;
+ struct dentry *root;
+ struct btrfs_fs_devices *fs_devices = NULL;
+ fmode_t mode = FMODE_READ;
+ int error = 0;
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, dir);
+ if (!(flags & MS_RDONLY))
+ mode |= FMODE_WRITE;
- err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
- if (err) {
- err = -ENOSPC;
- goto out_unlock;
- }
+ error = btrfs_parse_early_options(data, mode, fs_type,
+ &subvol_name, &fs_devices);
+ if (error)
+ return error;
- inode = btrfs_new_inode(trans, root, objectid,
- BTRFS_I(dir)->block_group, mode);
- err = PTR_ERR(inode);
- if (IS_ERR(inode))
- goto out_unlock;
+ error = btrfs_scan_one_device(dev_name, mode, fs_type, &fs_devices);
+ if (error)
+ goto error_free_subvol_name;
- btrfs_set_trans_block_group(trans, inode);
- err = btrfs_add_nondir(trans, dentry, inode);
- if (err)
- drop_inode = 1;
- else {
- inode->i_mapping->a_ops = &btrfs_aops;
- inode->i_fop = &btrfs_file_operations;
- inode->i_op = &btrfs_file_inode_operations;
- }
- dir->i_sb->s_dirt = 1;
- btrfs_update_inode_block_group(trans, inode);
- btrfs_update_inode_block_group(trans, dir);
-out_unlock:
- btrfs_end_transaction(trans, root);
- mutex_unlock(&root->fs_info->fs_mutex);
-
- if (drop_inode) {
- inode_dec_link_count(inode);
- iput(inode);
- }
- return err;
-}
+ error = btrfs_open_devices(fs_devices, mode, fs_type);
+ if (error)
+ goto error_free_subvol_name;
-static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- u64 objectid, u64 dirid)
-{
- int ret;
- char buf[2];
- struct btrfs_key key;
+ if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) {
+ error = -EACCES;
+ goto error_close_devices;
+ }
- buf[0] = '.';
- buf[1] = '.';
+ bdev = fs_devices->latest_bdev;
+ s = sget(fs_type, btrfs_test_super, set_anon_super, fs_devices);
+ if (IS_ERR(s))
+ goto error_s;
- key.objectid = objectid;
- key.offset = 0;
- key.flags = 0;
- btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
+ if (s->s_root) {
+ if ((flags ^ s->s_flags) & MS_RDONLY) {
+ up_write(&s->s_umount);
+ deactivate_super(s);
+ error = -EBUSY;
+ goto error_close_devices;
+ }
- ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid,
- &key, 1);
- if (ret)
- goto error;
- key.objectid = dirid;
- ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid,
- &key, 1);
- if (ret)
- goto error;
-error:
- return ret;
-}
+ btrfs_close_devices(fs_devices);
+ } else {
+ char b[BDEVNAME_SIZE];
-static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
-{
- struct inode *inode;
- struct btrfs_trans_handle *trans;
- struct btrfs_root *root = BTRFS_I(dir)->root;
- int err = 0;
- int drop_on_err = 0;
- u64 objectid;
+ s->s_flags = flags;
+ strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
+ error = btrfs_fill_super(s, fs_devices, data,
+ flags & MS_SILENT ? 1 : 0);
+ if (error) {
+ up_write(&s->s_umount);
+ deactivate_super(s);
+ goto error_free_subvol_name;
+ }
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, dir);
- if (IS_ERR(trans)) {
- err = PTR_ERR(trans);
- goto out_unlock;
+ btrfs_sb(s)->fs_info->bdev_holder = fs_type;
+ s->s_flags |= MS_ACTIVE;
}
- err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
- if (err) {
- err = -ENOSPC;
- goto out_unlock;
- }
+ if (!strcmp(subvol_name, "."))
+ root = dget(s->s_root);
+ else {
+ mutex_lock(&s->s_root->d_inode->i_mutex);
+ root = lookup_one_len(subvol_name, s->s_root,
+ strlen(subvol_name));
+ mutex_unlock(&s->s_root->d_inode->i_mutex);
- inode = btrfs_new_inode(trans, root, objectid,
- BTRFS_I(dir)->block_group, S_IFDIR | mode);
- if (IS_ERR(inode)) {
- err = PTR_ERR(inode);
- goto out_fail;
+ if (IS_ERR(root)) {
+ up_write(&s->s_umount);
+ deactivate_super(s);
+ error = PTR_ERR(root);
+ goto error_free_subvol_name;
+ }
+ if (!root->d_inode) {
+ dput(root);
+ up_write(&s->s_umount);
+ deactivate_super(s);
+ error = -ENXIO;
+ goto error_free_subvol_name;
+ }
}
- drop_on_err = 1;
- inode->i_op = &btrfs_dir_inode_operations;
- inode->i_fop = &btrfs_dir_file_operations;
- btrfs_set_trans_block_group(trans, inode);
- err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino);
- if (err)
- goto out_fail;
+ mnt->mnt_sb = s;
+ mnt->mnt_root = root;
- inode->i_size = 6;
- err = btrfs_update_inode(trans, root, inode);
- if (err)
- goto out_fail;
- err = btrfs_add_link(trans, dentry, inode);
- if (err)
- goto out_fail;
- d_instantiate(dentry, inode);
- drop_on_err = 0;
- dir->i_sb->s_dirt = 1;
- btrfs_update_inode_block_group(trans, inode);
- btrfs_update_inode_block_group(trans, dir);
-
-out_fail:
- btrfs_end_transaction(trans, root);
-out_unlock:
- mutex_unlock(&root->fs_info->fs_mutex);
- if (drop_on_err)
- iput(inode);
- return err;
-}
-
-static int btrfs_sync_file(struct file *file,
- struct dentry *dentry, int datasync)
-{
- struct inode *inode = dentry->d_inode;
- struct btrfs_root *root = BTRFS_I(inode)->root;
- int ret;
- struct btrfs_trans_handle *trans;
-
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- if (!trans) {
- ret = -ENOMEM;
- goto out;
- }
- ret = btrfs_commit_transaction(trans, root);
- mutex_unlock(&root->fs_info->fs_mutex);
-out:
- return ret > 0 ? EIO : ret;
-}
-
-static int btrfs_sync_fs(struct super_block *sb, int wait)
-{
- struct btrfs_trans_handle *trans;
- struct btrfs_root *root;
- int ret;
- root = btrfs_sb(sb);
-
- sb->s_dirt = 0;
- if (!wait) {
- filemap_flush(root->fs_info->btree_inode->i_mapping);
- return 0;
- }
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- ret = btrfs_commit_transaction(trans, root);
- sb->s_dirt = 0;
- BUG_ON(ret);
-printk("btrfs sync_fs\n");
- mutex_unlock(&root->fs_info->fs_mutex);
+ kfree(subvol_name);
return 0;
-}
-
-static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
- struct buffer_head *result, int create)
-{
- int ret;
- int err = 0;
- u64 blocknr;
- u64 extent_start = 0;
- u64 extent_end = 0;
- u64 objectid = inode->i_ino;
- u32 found_type;
- struct btrfs_path *path;
- struct btrfs_root *root = BTRFS_I(inode)->root;
- struct btrfs_file_extent_item *item;
- struct btrfs_leaf *leaf;
- struct btrfs_disk_key *found_key;
-
- path = btrfs_alloc_path();
- BUG_ON(!path);
- btrfs_init_path(path);
- if (create) {
- WARN_ON(1);
- }
-
- ret = btrfs_lookup_file_extent(NULL, root, path,
- inode->i_ino,
- iblock << inode->i_blkbits, 0);
- if (ret < 0) {
- err = ret;
- goto out;
- }
- if (ret != 0) {
- if (path->slots[0] == 0) {
- btrfs_release_path(root, path);
- goto out;
- }
- path->slots[0]--;
- }
-
- item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
- struct btrfs_file_extent_item);
- leaf = btrfs_buffer_leaf(path->nodes[0]);
- blocknr = btrfs_file_extent_disk_blocknr(item);
- blocknr += btrfs_file_extent_offset(item);
-
- /* are we inside the extent that was found? */
- found_key = &leaf->items[path->slots[0]].key;
- found_type = btrfs_disk_key_type(found_key);
- if (btrfs_disk_key_objectid(found_key) != objectid ||
- found_type != BTRFS_EXTENT_DATA_KEY) {
- extent_end = 0;
- extent_start = 0;
- btrfs_release_path(root, path);
- goto out;
- }
- found_type = btrfs_file_extent_type(item);
- extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key);
- if (found_type == BTRFS_FILE_EXTENT_REG) {
- extent_start = extent_start >> inode->i_blkbits;
- extent_end = extent_start + btrfs_file_extent_num_blocks(item);
- if (iblock >= extent_start && iblock < extent_end) {
- err = 0;
- btrfs_map_bh_to_logical(root, result, blocknr +
- iblock - extent_start);
- goto out;
- }
- } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
- char *ptr;
- char *map;
- u32 size;
- size = btrfs_file_extent_inline_len(leaf->items +
- path->slots[0]);
- extent_end = (extent_start + size) >> inode->i_blkbits;
- extent_start >>= inode->i_blkbits;
- if (iblock < extent_start || iblock > extent_end) {
- goto out;
- }
- ptr = btrfs_file_extent_inline_start(item);
- map = kmap(result->b_page);
- memcpy(map, ptr, size);
- memset(map + size, 0, PAGE_CACHE_SIZE - size);
- flush_dcache_page(result->b_page);
- kunmap(result->b_page);
- set_buffer_uptodate(result);
- SetPageChecked(result->b_page);
- btrfs_map_bh_to_logical(root, result, 0);
- }
-out:
- btrfs_release_path(root, path);
- btrfs_free_path(path);
- return err;
+error_s:
+ error = PTR_ERR(s);
+error_close_devices:
+ btrfs_close_devices(fs_devices);
+error_free_subvol_name:
+ kfree(subvol_name);
+ return error;
}
-static int btrfs_get_block(struct inode *inode, sector_t iblock,
- struct buffer_head *result, int create)
+static int btrfs_remount(struct super_block *sb, int *flags, char *data)
{
- int err;
- struct btrfs_root *root = BTRFS_I(inode)->root;
- mutex_lock(&root->fs_info->fs_mutex);
- err = btrfs_get_block_lock(inode, iblock, result, create);
- mutex_unlock(&root->fs_info->fs_mutex);
- return err;
-}
-
-static int btrfs_prepare_write(struct file *file, struct page *page,
- unsigned from, unsigned to)
-{
- return nobh_prepare_write(page, from, to, btrfs_get_block);
-}
-
-static void btrfs_write_super(struct super_block *sb)
-{
- btrfs_sync_fs(sb, 1);
-}
-
-static int btrfs_readpage(struct file *file, struct page *page)
-{
- return mpage_readpage(page, btrfs_get_block);
-}
-
-/*
- * While block_write_full_page is writing back the dirty buffers under
- * the page lock, whoever dirtied the buffers may decide to clean them
- * again at any time. We handle that by only looking at the buffer
- * state inside lock_buffer().
- *
- * If block_write_full_page() is called for regular writeback
- * (wbc->sync_mode == WB_SYNC_NONE) then it will redirty a page which has a
- * locked buffer. This only can happen if someone has written the buffer
- * directly, with submit_bh(). At the address_space level PageWriteback
- * prevents this contention from occurring.
- */
-static int __btrfs_write_full_page(struct inode *inode, struct page *page,
- struct writeback_control *wbc)
-{
- int err;
- sector_t block;
- sector_t last_block;
- struct buffer_head *bh, *head;
- const unsigned blocksize = 1 << inode->i_blkbits;
- int nr_underway = 0;
-
- BUG_ON(!PageLocked(page));
-
- last_block = (i_size_read(inode) - 1) >> inode->i_blkbits;
+ struct btrfs_root *root = btrfs_sb(sb);
+ int ret;
- if (!page_has_buffers(page)) {
- create_empty_buffers(page, blocksize,
- (1 << BH_Dirty)|(1 << BH_Uptodate));
- }
+ ret = btrfs_parse_options(root, data);
+ if (ret)
+ return -EINVAL;
- /*
- * Be very careful. We have no exclusion from __set_page_dirty_buffers
- * here, and the (potentially unmapped) buffers may become dirty at
- * any time. If a buffer becomes dirty here after we've inspected it
- * then we just miss that fact, and the page stays dirty.
- *
- * Buffers outside i_size may be dirtied by __set_page_dirty_buffers;
- * handle that here by just cleaning them.
- */
+ if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
+ return 0;
- block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
- head = page_buffers(page);
- bh = head;
+ if (*flags & MS_RDONLY) {
+ sb->s_flags |= MS_RDONLY;
- /*
- * Get all the dirty buffers mapped to disk addresses and
- * handle any aliases from the underlying blockdev's mapping.
- */
- do {
- if (block > last_block) {
- /*
- * mapped buffers outside i_size will occur, because
- * this page can be outside i_size when there is a
- * truncate in progress.
- */
- /*
- * The buffer was zeroed by block_write_full_page()
- */
- clear_buffer_dirty(bh);
- set_buffer_uptodate(bh);
- } else if (!buffer_mapped(bh) && buffer_dirty(bh)) {
- WARN_ON(bh->b_size != blocksize);
- err = btrfs_get_block(inode, block, bh, 0);
- if (err)
- goto recover;
- if (buffer_new(bh)) {
- /* blockdev mappings never come here */
- clear_buffer_new(bh);
- unmap_underlying_metadata(bh->b_bdev,
- bh->b_blocknr);
- }
- }
- bh = bh->b_this_page;
- block++;
- } while (bh != head);
+ ret = btrfs_commit_super(root);
+ WARN_ON(ret);
+ } else {
+ if (root->fs_info->fs_devices->rw_devices == 0)
+ return -EACCES;
- do {
- if (!buffer_mapped(bh))
- continue;
- /*
- * If it's a fully non-blocking write attempt and we cannot
- * lock the buffer then redirty the page. Note that this can
- * potentially cause a busy-wait loop from pdflush and kswapd
- * activity, but those code paths have their own higher-level
- * throttling.
- */
- if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) {
- lock_buffer(bh);
- } else if (test_set_buffer_locked(bh)) {
- redirty_page_for_writepage(wbc, page);
- continue;
- }
- if (test_clear_buffer_dirty(bh) && bh->b_blocknr != 0) {
- mark_buffer_async_write(bh);
- } else {
- unlock_buffer(bh);
- }
- } while ((bh = bh->b_this_page) != head);
+ if (btrfs_super_log_root(&root->fs_info->super_copy) != 0)
+ return -EINVAL;
- /*
- * The page and its buffers are protected by PageWriteback(), so we can
- * drop the bh refcounts early.
- */
- BUG_ON(PageWriteback(page));
- set_page_writeback(page);
-
- do {
- struct buffer_head *next = bh->b_this_page;
- if (buffer_async_write(bh)) {
- submit_bh(WRITE, bh);
- nr_underway++;
- }
- bh = next;
- } while (bh != head);
- unlock_page(page);
-
- err = 0;
-done:
- if (nr_underway == 0) {
- /*
- * The page was marked dirty, but the buffers were
- * clean. Someone wrote them back by hand with
- * ll_rw_block/submit_bh. A rare case.
- */
- int uptodate = 1;
- do {
- if (!buffer_uptodate(bh)) {
- uptodate = 0;
- break;
- }
- bh = bh->b_this_page;
- } while (bh != head);
- if (uptodate)
- SetPageUptodate(page);
- end_page_writeback(page);
- /*
- * The page and buffer_heads can be released at any time from
- * here on.
- */
- wbc->pages_skipped++; /* We didn't write this page */
- }
- return err;
+ ret = btrfs_cleanup_reloc_trees(root);
+ WARN_ON(ret);
-recover:
- /*
- * ENOSPC, or some other error. We may already have added some
- * blocks to the file, so we need to write these out to avoid
- * exposing stale data.
- * The page is currently locked and not marked for writeback
- */
- bh = head;
- /* Recovery: lock and submit the mapped buffers */
- do {
- if (buffer_mapped(bh) && buffer_dirty(bh)) {
- lock_buffer(bh);
- mark_buffer_async_write(bh);
- } else {
- /*
- * The buffer may have been set dirty during
- * attachment to a dirty page.
- */
- clear_buffer_dirty(bh);
- }
- } while ((bh = bh->b_this_page) != head);
- SetPageError(page);
- BUG_ON(PageWriteback(page));
- set_page_writeback(page);
- do {
- struct buffer_head *next = bh->b_this_page;
- if (buffer_async_write(bh)) {
- clear_buffer_dirty(bh);
- submit_bh(WRITE, bh);
- nr_underway++;
- }
- bh = next;
- } while (bh != head);
- unlock_page(page);
- goto done;
-}
+ ret = btrfs_cleanup_fs_roots(root->fs_info);
+ WARN_ON(ret);
-/*
- * The generic ->writepage function for buffer-backed address_spaces
- */
-static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
-{
- struct inode * const inode = page->mapping->host;
- loff_t i_size = i_size_read(inode);
- const pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
- unsigned offset;
- void *kaddr;
-
- /* Is the page fully inside i_size? */
- if (page->index < end_index)
- return __btrfs_write_full_page(inode, page, wbc);
-
- /* Is the page fully outside i_size? (truncate in progress) */
- offset = i_size & (PAGE_CACHE_SIZE-1);
- if (page->index >= end_index+1 || !offset) {
- /*
- * The page may have dirty, unmapped buffers. For example,
- * they may have been added in ext3_writepage(). Make them
- * freeable here, so the page does not leak.
- */
- block_invalidatepage(page, 0);
- unlock_page(page);
- return 0; /* don't care */
+ sb->s_flags &= ~MS_RDONLY;
}
- /*
- * The page straddles i_size. It must be zeroed out on each and every
- * writepage invokation because it may be mmapped. "A file is mapped
- * in multiples of the page size. For a file that is not a multiple of
- * the page size, the remaining memory is zeroed when mapped, and
- * writes to that region are not written out to the file."
- */
- kaddr = kmap_atomic(page, KM_USER0);
- memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
- flush_dcache_page(page);
- kunmap_atomic(kaddr, KM_USER0);
- return __btrfs_write_full_page(inode, page, wbc);
-}
-
-static void btrfs_truncate(struct inode *inode)
-{
- struct btrfs_root *root = BTRFS_I(inode)->root;
- int ret;
- struct btrfs_trans_handle *trans;
-
- if (!S_ISREG(inode->i_mode))
- return;
- if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
- return;
-
- nobh_truncate_page(inode->i_mapping, inode->i_size);
-
- /* FIXME, add redo link to tree so we don't leak on crash */
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, inode);
- ret = btrfs_truncate_in_trans(trans, root, inode);
- BUG_ON(ret);
- ret = btrfs_end_transaction(trans, root);
- BUG_ON(ret);
- mutex_unlock(&root->fs_info->fs_mutex);
- mark_inode_dirty(inode);
-}
-
-/*
- * Make sure any changes to nobh_commit_write() are reflected in
- * nobh_truncate_page(), since it doesn't call commit_write().
- */
-static int btrfs_commit_write(struct file *file, struct page *page,
- unsigned from, unsigned to)
-{
- struct inode *inode = page->mapping->host;
- struct buffer_head *bh;
- loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
-
- SetPageUptodate(page);
- bh = page_buffers(page);
- if (buffer_mapped(bh) && bh->b_blocknr != 0) {
- set_page_dirty(page);
- }
- if (pos > inode->i_size) {
- i_size_write(inode, pos);
- mark_inode_dirty(inode);
- }
return 0;
}
-static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes,
- struct page **prepared_pages,
- const char __user * buf)
-{
- long page_fault = 0;
- int i;
- int offset = pos & (PAGE_CACHE_SIZE - 1);
-
- for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) {
- size_t count = min_t(size_t,
- PAGE_CACHE_SIZE - offset, write_bytes);
- struct page *page = prepared_pages[i];
- fault_in_pages_readable(buf, count);
-
- /* Copy data from userspace to the current page */
- kmap(page);
- page_fault = __copy_from_user(page_address(page) + offset,
- buf, count);
- /* Flush processor's dcache for this page */
- flush_dcache_page(page);
- kunmap(page);
- buf += count;
- write_bytes -= count;
-
- if (page_fault)
- break;
- }
- return page_fault ? -EFAULT : 0;
-}
-
-static void btrfs_drop_pages(struct page **pages, size_t num_pages)
-{
- size_t i;
- for (i = 0; i < num_pages; i++) {
- if (!pages[i])
- break;
- unlock_page(pages[i]);
- mark_page_accessed(pages[i]);
- page_cache_release(pages[i]);
- }
-}
-static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct file *file,
- struct page **pages,
- size_t num_pages,
- loff_t pos,
- size_t write_bytes)
-{
- int i;
- int offset;
- int err = 0;
- int ret;
- int this_write;
- struct inode *inode = file->f_path.dentry->d_inode;
- struct buffer_head *bh;
- struct btrfs_file_extent_item *ei;
-
- for (i = 0; i < num_pages; i++) {
- offset = pos & (PAGE_CACHE_SIZE -1);
- this_write = min(PAGE_CACHE_SIZE - offset, write_bytes);
- /* FIXME, one block at a time */
-
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, inode);
-
- bh = page_buffers(pages[i]);
- if (buffer_mapped(bh) && bh->b_blocknr == 0) {
- struct btrfs_key key;
- struct btrfs_path *path;
- char *ptr;
- u32 datasize;
-
- path = btrfs_alloc_path();
- BUG_ON(!path);
- key.objectid = inode->i_ino;
- key.offset = pages[i]->index << PAGE_CACHE_SHIFT;
- key.flags = 0;
- btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
- BUG_ON(write_bytes >= PAGE_CACHE_SIZE);
- datasize = offset +
- btrfs_file_extent_calc_inline_size(write_bytes);
- ret = btrfs_insert_empty_item(trans, root, path, &key,
- datasize);
- BUG_ON(ret);
- ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
- path->slots[0], struct btrfs_file_extent_item);
- btrfs_set_file_extent_generation(ei, trans->transid);
- btrfs_set_file_extent_type(ei,
- BTRFS_FILE_EXTENT_INLINE);
- ptr = btrfs_file_extent_inline_start(ei);
- memcpy(ptr, bh->b_data, offset + write_bytes);
- mark_buffer_dirty(path->nodes[0]);
- btrfs_free_path(path);
- } else {
- btrfs_csum_file_block(trans, root, inode->i_ino,
- pages[i]->index << PAGE_CACHE_SHIFT,
- kmap(pages[i]), PAGE_CACHE_SIZE);
- kunmap(pages[i]);
- }
- SetPageChecked(pages[i]);
- btrfs_update_inode_block_group(trans, inode);
- ret = btrfs_end_transaction(trans, root);
- BUG_ON(ret);
- mutex_unlock(&root->fs_info->fs_mutex);
-
- ret = btrfs_commit_write(file, pages[i], offset,
- offset + this_write);
- pos += this_write;
- if (ret) {
- err = ret;
- goto failed;
- }
- WARN_ON(this_write > write_bytes);
- write_bytes -= this_write;
- }
-failed:
- return err;
-}
-
-static int drop_extents(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct inode *inode,
- u64 start, u64 end)
+static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
- int ret;
- struct btrfs_key key;
- struct btrfs_leaf *leaf;
- int slot;
- struct btrfs_file_extent_item *extent;
- u64 extent_end = 0;
- int keep;
- struct btrfs_file_extent_item old;
- struct btrfs_path *path;
- u64 search_start = start;
- int bookend;
- int found_type;
- int found_extent;
- int found_inline;
-
- path = btrfs_alloc_path();
- if (!path)
- return -ENOMEM;
- while(1) {
- btrfs_release_path(root, path);
- ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino,
- search_start, -1);
- if (ret < 0)
- goto out;
- if (ret > 0) {
- if (path->slots[0] == 0) {
- ret = 0;
- goto out;
- }
- path->slots[0]--;
- }
- keep = 0;
- bookend = 0;
- found_extent = 0;
- found_inline = 0;
- extent = NULL;
- leaf = btrfs_buffer_leaf(path->nodes[0]);
- slot = path->slots[0];
- btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key);
- if (key.offset >= end || key.objectid != inode->i_ino) {
- ret = 0;
- goto out;
- }
- if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) {
- ret = 0;
- goto out;
- }
- extent = btrfs_item_ptr(leaf, slot,
- struct btrfs_file_extent_item);
- found_type = btrfs_file_extent_type(extent);
- if (found_type == BTRFS_FILE_EXTENT_REG) {
- extent_end = key.offset +
- (btrfs_file_extent_num_blocks(extent) <<
- inode->i_blkbits);
- found_extent = 1;
- } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
- found_inline = 1;
- extent_end = key.offset +
- btrfs_file_extent_inline_len(leaf->items + slot);
- }
-
- if (!found_extent && !found_inline) {
- ret = 0;
- goto out;
- }
-
- if (search_start >= extent_end) {
- ret = 0;
- goto out;
- }
-
- search_start = extent_end;
-
- if (end < extent_end && end >= key.offset) {
- if (found_extent) {
- memcpy(&old, extent, sizeof(old));
- ret = btrfs_inc_extent_ref(trans, root,
- btrfs_file_extent_disk_blocknr(&old),
- btrfs_file_extent_disk_num_blocks(&old));
- BUG_ON(ret);
- }
- WARN_ON(found_inline);
- bookend = 1;
- }
+ struct btrfs_root *root = btrfs_sb(dentry->d_sb);
+ struct btrfs_super_block *disk_super = &root->fs_info->super_copy;
+ int bits = dentry->d_sb->s_blocksize_bits;
+ __be32 *fsid = (__be32 *)root->fs_info->fsid;
- if (start > key.offset) {
- u64 new_num;
- u64 old_num;
- /* truncate existing extent */
- keep = 1;
- WARN_ON(start & (root->blocksize - 1));
- if (found_extent) {
- new_num = (start - key.offset) >>
- inode->i_blkbits;
- old_num = btrfs_file_extent_num_blocks(extent);
- inode->i_blocks -= (old_num - new_num) << 3;
- btrfs_set_file_extent_num_blocks(extent,
- new_num);
- mark_buffer_dirty(path->nodes[0]);
- } else {
- WARN_ON(1);
- /*
- ret = btrfs_truncate_item(trans, root, path,
- start - key.offset);
- BUG_ON(ret);
- */
- }
- }
- if (!keep) {
- u64 disk_blocknr = 0;
- u64 disk_num_blocks = 0;
- u64 extent_num_blocks = 0;
- if (found_extent) {
- disk_blocknr =
- btrfs_file_extent_disk_blocknr(extent);
- disk_num_blocks =
- btrfs_file_extent_disk_num_blocks(extent);
- extent_num_blocks =
- btrfs_file_extent_num_blocks(extent);
- }
- ret = btrfs_del_item(trans, root, path);
- BUG_ON(ret);
- btrfs_release_path(root, path);
- if (found_extent) {
- inode->i_blocks -=
- btrfs_file_extent_num_blocks(extent) << 3;
- ret = btrfs_free_extent(trans, root,
- disk_blocknr,
- disk_num_blocks, 0);
- }
+ buf->f_namelen = BTRFS_NAME_LEN;
+ 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;
- BUG_ON(ret);
- if (!bookend && search_start >= end) {
- ret = 0;
- goto out;
- }
- if (!bookend)
- continue;
- }
- if (bookend && found_extent) {
- /* create bookend */
- struct btrfs_key ins;
- ins.objectid = inode->i_ino;
- ins.offset = end;
- ins.flags = 0;
- btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY);
-
- btrfs_release_path(root, path);
- ret = btrfs_insert_empty_item(trans, root, path, &ins,
- sizeof(*extent));
- BUG_ON(ret);
- extent = btrfs_item_ptr(
- btrfs_buffer_leaf(path->nodes[0]),
- path->slots[0],
- struct btrfs_file_extent_item);
- btrfs_set_file_extent_disk_blocknr(extent,
- btrfs_file_extent_disk_blocknr(&old));
- btrfs_set_file_extent_disk_num_blocks(extent,
- btrfs_file_extent_disk_num_blocks(&old));
-
- btrfs_set_file_extent_offset(extent,
- btrfs_file_extent_offset(&old) +
- ((end - key.offset) >> inode->i_blkbits));
- WARN_ON(btrfs_file_extent_num_blocks(&old) <
- (end - key.offset) >> inode->i_blkbits);
- btrfs_set_file_extent_num_blocks(extent,
- btrfs_file_extent_num_blocks(&old) -
- ((end - key.offset) >> inode->i_blkbits));
-
- btrfs_set_file_extent_type(extent,
- BTRFS_FILE_EXTENT_REG);
- btrfs_set_file_extent_generation(extent,
- btrfs_file_extent_generation(&old));
- btrfs_mark_buffer_dirty(path->nodes[0]);
- inode->i_blocks +=
- btrfs_file_extent_num_blocks(extent) << 3;
- ret = 0;
- goto out;
- }
- }
-out:
- btrfs_free_path(path);
- return ret;
-}
+ /* We treat it as constant endianness (it doesn't matter _which_)
+ because we want the fsid to come out the same whether mounted
+ on a big-endian or little-endian host */
+ buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]);
+ buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]);
+ /* Mask in the root object ID too, to disambiguate subvols */
+ buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32;
+ buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid;
-static int prepare_pages(struct btrfs_root *root,
- struct file *file,
- struct page **pages,
- size_t num_pages,
- loff_t pos,
- unsigned long first_index,
- unsigned long last_index,
- size_t write_bytes,
- u64 alloc_extent_start)
-{
- int i;
- unsigned long index = pos >> PAGE_CACHE_SHIFT;
- struct inode *inode = file->f_path.dentry->d_inode;
- int offset;
- int err = 0;
- int this_write;
- struct buffer_head *bh;
- struct buffer_head *head;
- loff_t isize = i_size_read(inode);
-
- memset(pages, 0, num_pages * sizeof(struct page *));
-
- for (i = 0; i < num_pages; i++) {
- pages[i] = grab_cache_page(inode->i_mapping, index + i);
- if (!pages[i]) {
- err = -ENOMEM;
- goto failed_release;
- }
- offset = pos & (PAGE_CACHE_SIZE -1);
- this_write = min(PAGE_CACHE_SIZE - offset, write_bytes);
- create_empty_buffers(pages[i], root->fs_info->sb->s_blocksize,
- (1 << BH_Uptodate));
- head = page_buffers(pages[i]);
- bh = head;
- do {
- err = btrfs_map_bh_to_logical(root, bh,
- alloc_extent_start);
- BUG_ON(err);
- if (err)
- goto failed_truncate;
- bh = bh->b_this_page;
- if (alloc_extent_start)
- alloc_extent_start++;
- } while (bh != head);
- pos += this_write;
- WARN_ON(this_write > write_bytes);
- write_bytes -= this_write;
- }
return 0;
-
-failed_release:
- btrfs_drop_pages(pages, num_pages);
- return err;
-
-failed_truncate:
- btrfs_drop_pages(pages, num_pages);
- if (pos > isize)
- vmtruncate(inode, isize);
- return err;
}
-static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- loff_t pos;
- size_t num_written = 0;
- int err = 0;
- int ret = 0;
- struct inode *inode = file->f_path.dentry->d_inode;
- struct btrfs_root *root = BTRFS_I(inode)->root;
- struct page *pages[8];
- struct page *pinned[2] = { NULL, NULL };
- unsigned long first_index;
- unsigned long last_index;
- u64 start_pos;
- u64 num_blocks;
- u64 alloc_extent_start;
- struct btrfs_trans_handle *trans;
- struct btrfs_key ins;
-
- if (file->f_flags & O_DIRECT)
- return -EINVAL;
- pos = *ppos;
- vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
- current->backing_dev_info = inode->i_mapping->backing_dev_info;
- err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
- if (err)
- goto out;
- if (count == 0)
- goto out;
- err = remove_suid(file->f_path.dentry);
- if (err)
- goto out;
- file_update_time(file);
-
- start_pos = pos & ~((u64)PAGE_CACHE_SIZE - 1);
- num_blocks = (count + pos - start_pos + root->blocksize - 1) >>
- inode->i_blkbits;
-
- mutex_lock(&inode->i_mutex);
- first_index = pos >> PAGE_CACHE_SHIFT;
- last_index = (pos + count) >> PAGE_CACHE_SHIFT;
-
- if ((first_index << PAGE_CACHE_SHIFT) < inode->i_size &&
- (pos & (PAGE_CACHE_SIZE - 1))) {
- pinned[0] = grab_cache_page(inode->i_mapping, first_index);
- if (!PageUptodate(pinned[0])) {
- ret = mpage_readpage(pinned[0], btrfs_get_block);
- BUG_ON(ret);
- } else {
- unlock_page(pinned[0]);
- }
- }
- if (first_index != last_index &&
- (last_index << PAGE_CACHE_SHIFT) < inode->i_size &&
- (count & (PAGE_CACHE_SIZE - 1))) {
- pinned[1] = grab_cache_page(inode->i_mapping, last_index);
- if (!PageUptodate(pinned[1])) {
- ret = mpage_readpage(pinned[1], btrfs_get_block);
- BUG_ON(ret);
- } else {
- unlock_page(pinned[1]);
- }
- }
-
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- if (!trans) {
- err = -ENOMEM;
- mutex_unlock(&root->fs_info->fs_mutex);
- goto out_unlock;
- }
- btrfs_set_trans_block_group(trans, inode);
- /* FIXME blocksize != 4096 */
- inode->i_blocks += num_blocks << 3;
- if (start_pos < inode->i_size) {
- /* FIXME blocksize != pagesize */
- ret = drop_extents(trans, root, inode,
- start_pos,
- (pos + count + root->blocksize -1) &
- ~((u64)root->blocksize - 1));
- BUG_ON(ret);
- }
- if (inode->i_size >= PAGE_CACHE_SIZE || pos + count < inode->i_size ||
- pos + count - start_pos > BTRFS_MAX_INLINE_DATA_SIZE(root)) {
- ret = btrfs_alloc_extent(trans, root, inode->i_ino,
- num_blocks, 1, (u64)-1, &ins);
- BUG_ON(ret);
- ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
- start_pos, ins.objectid, ins.offset);
- BUG_ON(ret);
- } else {
- ins.offset = 0;
- ins.objectid = 0;
- }
- BUG_ON(ret);
- alloc_extent_start = ins.objectid;
- btrfs_update_inode_block_group(trans, inode);
- ret = btrfs_end_transaction(trans, root);
- mutex_unlock(&root->fs_info->fs_mutex);
-
- while(count > 0) {
- size_t offset = pos & (PAGE_CACHE_SIZE - 1);
- size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset);
- size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >>
- PAGE_CACHE_SHIFT;
-
- memset(pages, 0, sizeof(pages));
- ret = prepare_pages(root, file, pages, num_pages,
- pos, first_index, last_index,
- write_bytes, alloc_extent_start);
- BUG_ON(ret);
-
- /* FIXME blocks != pagesize */
- if (alloc_extent_start)
- alloc_extent_start += num_pages;
- ret = btrfs_copy_from_user(pos, num_pages,
- write_bytes, pages, buf);
- BUG_ON(ret);
-
- ret = dirty_and_release_pages(NULL, root, file, pages,
- num_pages, pos, write_bytes);
- BUG_ON(ret);
- btrfs_drop_pages(pages, num_pages);
-
- buf += write_bytes;
- count -= write_bytes;
- pos += write_bytes;
- num_written += write_bytes;
-
- balance_dirty_pages_ratelimited(inode->i_mapping);
- cond_resched();
- }
-out_unlock:
- mutex_unlock(&inode->i_mutex);
-out:
- if (pinned[0])
- page_cache_release(pinned[0]);
- if (pinned[1])
- page_cache_release(pinned[1]);
- *ppos = pos;
- current->backing_dev_info = NULL;
- mark_inode_dirty(inode);
- return num_written ? num_written : err;
-}
-
-static int btrfs_read_actor(read_descriptor_t *desc, struct page *page,
- unsigned long offset, unsigned long size)
-{
- char *kaddr;
- unsigned long left, count = desc->count;
- struct inode *inode = page->mapping->host;
-
- if (size > count)
- size = count;
-
- if (!PageChecked(page)) {
- /* FIXME, do it per block */
- struct btrfs_root *root = BTRFS_I(inode)->root;
-
- int ret = btrfs_csum_verify_file_block(root,
- page->mapping->host->i_ino,
- page->index << PAGE_CACHE_SHIFT,
- kmap(page), PAGE_CACHE_SIZE);
- if (ret) {
- printk("failed to verify ino %lu page %lu\n",
- page->mapping->host->i_ino,
- page->index);
- memset(page_address(page), 0, PAGE_CACHE_SIZE);
- }
- SetPageChecked(page);
- kunmap(page);
- }
- /*
- * Faults on the destination of a read are common, so do it before
- * taking the kmap.
- */
- if (!fault_in_pages_writeable(desc->arg.buf, size)) {
- kaddr = kmap_atomic(page, KM_USER0);
- left = __copy_to_user_inatomic(desc->arg.buf,
- kaddr + offset, size);
- kunmap_atomic(kaddr, KM_USER0);
- if (left == 0)
- goto success;
- }
-
- /* Do it the slow way */
- kaddr = kmap(page);
- left = __copy_to_user(desc->arg.buf, kaddr + offset, size);
- kunmap(page);
-
- if (left) {
- size -= left;
- desc->error = -EFAULT;
- }
-success:
- desc->count = count - size;
- desc->written += size;
- desc->arg.buf += size;
- return size;
-}
+static struct file_system_type btrfs_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "btrfs",
+ .get_sb = btrfs_get_sb,
+ .kill_sb = kill_anon_super,
+ .fs_flags = FS_REQUIRES_DEV,
+};
-/**
- * btrfs_file_aio_read - filesystem read routine
- * @iocb: kernel I/O control block
- * @iov: io vector request
- * @nr_segs: number of segments in the iovec
- * @pos: current file position
+/*
+ * used by btrfsctl to scan devices when no FS is mounted
*/
-static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs, loff_t pos)
+static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
{
- struct file *filp = iocb->ki_filp;
- ssize_t retval;
- unsigned long seg;
- size_t count;
- loff_t *ppos = &iocb->ki_pos;
-
- count = 0;
- for (seg = 0; seg < nr_segs; seg++) {
- const struct iovec *iv = &iov[seg];
-
- /*
- * If any segment has a negative length, or the cumulative
- * length ever wraps negative then return -EINVAL.
- */
- count += iv->iov_len;
- if (unlikely((ssize_t)(count|iv->iov_len) < 0))
- return -EINVAL;
- if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len))
- continue;
- if (seg == 0)
- return -EFAULT;
- nr_segs = seg;
- count -= iv->iov_len; /* This segment is no good */
- break;
- }
- retval = 0;
- if (count) {
- for (seg = 0; seg < nr_segs; seg++) {
- read_descriptor_t desc;
-
- desc.written = 0;
- desc.arg.buf = iov[seg].iov_base;
- desc.count = iov[seg].iov_len;
- if (desc.count == 0)
- continue;
- desc.error = 0;
- do_generic_file_read(filp, ppos, &desc,
- btrfs_read_actor);
- retval += desc.written;
- if (desc.error) {
- retval = retval ?: desc.error;
- break;
- }
- }
- }
- return retval;
-}
-
-static int create_subvol(struct btrfs_root *root, char *name, int namelen)
-{
- struct btrfs_trans_handle *trans;
- struct btrfs_key key;
- struct btrfs_root_item root_item;
- struct btrfs_inode_item *inode_item;
- struct buffer_head *subvol;
- struct btrfs_leaf *leaf;
- struct btrfs_root *new_root;
- struct inode *inode;
- struct inode *dir;
- int ret;
- u64 objectid;
- u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
-
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- BUG_ON(!trans);
-
- subvol = btrfs_alloc_free_block(trans, root, 0);
- if (subvol == NULL)
- return -ENOSPC;
- leaf = btrfs_buffer_leaf(subvol);
- btrfs_set_header_nritems(&leaf->header, 0);
- btrfs_set_header_level(&leaf->header, 0);
- btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol));
- btrfs_set_header_generation(&leaf->header, trans->transid);
- btrfs_set_header_owner(&leaf->header, root->root_key.objectid);
- memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid,
- sizeof(leaf->header.fsid));
- mark_buffer_dirty(subvol);
-
- inode_item = &root_item.inode;
- memset(inode_item, 0, sizeof(*inode_item));
- btrfs_set_inode_generation(inode_item, 1);
- btrfs_set_inode_size(inode_item, 3);
- btrfs_set_inode_nlink(inode_item, 1);
- btrfs_set_inode_nblocks(inode_item, 1);
- btrfs_set_inode_mode(inode_item, S_IFDIR | 0755);
-
- btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol));
- btrfs_set_root_refs(&root_item, 1);
- brelse(subvol);
- subvol = NULL;
-
- ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
- 0, &objectid);
- BUG_ON(ret);
-
- btrfs_set_root_dirid(&root_item, new_dirid);
-
- key.objectid = objectid;
- key.offset = 1;
- key.flags = 0;
- btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
- ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
- &root_item);
- BUG_ON(ret);
+ struct btrfs_ioctl_vol_args *vol;
+ struct btrfs_fs_devices *fs_devices;
+ int ret = -ENOTTY;
- /*
- * insert the directory item
- */
- key.offset = (u64)-1;
- dir = root->fs_info->sb->s_root->d_inode;
- ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
- name, namelen, dir->i_ino, &key, 0);
- BUG_ON(ret);
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
- ret = btrfs_commit_transaction(trans, root);
- BUG_ON(ret);
-
- new_root = btrfs_read_fs_root(root->fs_info, &key);
- BUG_ON(!new_root);
-
- trans = btrfs_start_transaction(new_root, 1);
- BUG_ON(!trans);
-
- inode = btrfs_new_inode(trans, new_root, new_dirid,
- BTRFS_I(dir)->block_group, S_IFDIR | 0700);
- inode->i_op = &btrfs_dir_inode_operations;
- inode->i_fop = &btrfs_dir_file_operations;
-
- ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid);
- BUG_ON(ret);
-
- inode->i_nlink = 1;
- inode->i_size = 6;
- ret = btrfs_update_inode(trans, new_root, inode);
- BUG_ON(ret);
-
- ret = btrfs_commit_transaction(trans, new_root);
- BUG_ON(ret);
-
- iput(inode);
-
- mutex_unlock(&root->fs_info->fs_mutex);
- return 0;
-}
-
-static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
-{
- struct btrfs_trans_handle *trans;
- struct btrfs_key key;
- struct btrfs_root_item new_root_item;
- int ret;
- u64 objectid;
-
- if (!root->ref_cows)
- return -EINVAL;
-
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- BUG_ON(!trans);
-
- ret = btrfs_update_inode(trans, root, root->inode);
- BUG_ON(ret);
-
- ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
- 0, &objectid);
- BUG_ON(ret);
-
- memcpy(&new_root_item, &root->root_item,
- sizeof(new_root_item));
-
- key.objectid = objectid;
- key.offset = 1;
- key.flags = 0;
- btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
- btrfs_set_root_blocknr(&new_root_item, bh_blocknr(root->node));
-
- ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
- &new_root_item);
- BUG_ON(ret);
-
- /*
- * insert the directory item
- */
- key.offset = (u64)-1;
- ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
- name, namelen,
- root->fs_info->sb->s_root->d_inode->i_ino,
- &key, 0);
-
- BUG_ON(ret);
-
- ret = btrfs_inc_root_ref(trans, root);
- BUG_ON(ret);
-
- ret = btrfs_commit_transaction(trans, root);
- BUG_ON(ret);
- mutex_unlock(&root->fs_info->fs_mutex);
- return 0;
-}
-
-static int add_disk(struct btrfs_root *root, char *name, int namelen)
-{
- struct block_device *bdev;
- struct btrfs_path *path;
- struct super_block *sb = root->fs_info->sb;
- struct btrfs_root *dev_root = root->fs_info->dev_root;
- struct btrfs_trans_handle *trans;
- struct btrfs_device_item *dev_item;
- struct btrfs_key key;
- u16 item_size;
- u64 num_blocks;
- u64 new_blocks;
- u64 device_id;
- int ret;
-
-printk("adding disk %s\n", name);
- path = btrfs_alloc_path();
- if (!path)
+ vol = kmalloc(sizeof(*vol), GFP_KERNEL);
+ if (!vol)
return -ENOMEM;
- num_blocks = btrfs_super_total_blocks(root->fs_info->disk_super);
- bdev = open_bdev_excl(name, O_RDWR, sb);
- if (IS_ERR(bdev)) {
- ret = PTR_ERR(bdev);
-printk("open bdev excl failed ret %d\n", ret);
- goto out_nolock;
- }
- set_blocksize(bdev, sb->s_blocksize);
- new_blocks = bdev->bd_inode->i_size >> sb->s_blocksize_bits;
- key.objectid = num_blocks;
- key.offset = new_blocks;
- key.flags = 0;
- btrfs_set_key_type(&key, BTRFS_DEV_ITEM_KEY);
-
- mutex_lock(&dev_root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(dev_root, 1);
- item_size = sizeof(*dev_item) + namelen;
-printk("insert empty on %Lu %Lu %u size %d\n", num_blocks, new_blocks, key.flags, item_size);
- ret = btrfs_insert_empty_item(trans, dev_root, path, &key, item_size);
- if (ret) {
-printk("insert failed %d\n", ret);
- close_bdev_excl(bdev);
- if (ret > 0)
- ret = -EEXIST;
+
+ if (copy_from_user(vol, (void __user *)arg, sizeof(*vol))) {
+ ret = -EFAULT;
goto out;
}
- dev_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
- path->slots[0], struct btrfs_device_item);
- btrfs_set_device_pathlen(dev_item, namelen);
- memcpy(dev_item + 1, name, namelen);
-
- device_id = btrfs_super_last_device_id(root->fs_info->disk_super) + 1;
- btrfs_set_super_last_device_id(root->fs_info->disk_super, device_id);
- btrfs_set_device_id(dev_item, device_id);
- mark_buffer_dirty(path->nodes[0]);
-
- ret = btrfs_insert_dev_radix(root, bdev, device_id, num_blocks,
- new_blocks);
-
- if (!ret) {
- btrfs_set_super_total_blocks(root->fs_info->disk_super,
- num_blocks + new_blocks);
- i_size_write(root->fs_info->btree_inode,
- (num_blocks + new_blocks) <<
- root->fs_info->btree_inode->i_blkbits);
- }
-
-out:
- ret = btrfs_commit_transaction(trans, dev_root);
- BUG_ON(ret);
- mutex_unlock(&root->fs_info->fs_mutex);
-out_nolock:
- btrfs_free_path(path);
-
- return ret;
-}
-
-static int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int
- cmd, unsigned long arg)
-{
- struct btrfs_root *root = BTRFS_I(inode)->root;
- struct btrfs_ioctl_vol_args vol_args;
- int ret = 0;
- struct btrfs_dir_item *di;
- int namelen;
- struct btrfs_path *path;
- u64 root_dirid;
switch (cmd) {
- case BTRFS_IOC_SNAP_CREATE:
- if (copy_from_user(&vol_args,
- (struct btrfs_ioctl_vol_args __user *)arg,
- sizeof(vol_args)))
- return -EFAULT;
- namelen = strlen(vol_args.name);
- if (namelen > BTRFS_VOL_NAME_MAX)
- return -EINVAL;
- path = btrfs_alloc_path();
- if (!path)
- return -ENOMEM;
- root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
- mutex_lock(&root->fs_info->fs_mutex);
- di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
- path, root_dirid,
- vol_args.name, namelen, 0);
- mutex_unlock(&root->fs_info->fs_mutex);
- btrfs_free_path(path);
- if (di && !IS_ERR(di))
- return -EEXIST;
-
- if (root == root->fs_info->tree_root)
- ret = create_subvol(root, vol_args.name, namelen);
- else
- ret = create_snapshot(root, vol_args.name, namelen);
- WARN_ON(ret);
+ case BTRFS_IOC_SCAN_DEV:
+ ret = btrfs_scan_one_device(vol->name, FMODE_READ,
+ &btrfs_fs_type, &fs_devices);
break;
- case BTRFS_IOC_ADD_DISK:
- if (copy_from_user(&vol_args,
- (struct btrfs_ioctl_vol_args __user *)arg,
- sizeof(vol_args)))
- return -EFAULT;
- namelen = strlen(vol_args.name);
- if (namelen > BTRFS_VOL_NAME_MAX)
- return -EINVAL;
- vol_args.name[namelen] = '\0';
- ret = add_disk(root, vol_args.name, namelen);
- break;
- default:
- return -ENOTTY;
}
+out:
+ kfree(vol);
return ret;
}
-static struct kmem_cache *btrfs_inode_cachep;
-struct kmem_cache *btrfs_trans_handle_cachep;
-struct kmem_cache *btrfs_transaction_cachep;
-struct kmem_cache *btrfs_bit_radix_cachep;
-struct kmem_cache *btrfs_path_cachep;
-
-/*
- * Called inside transaction, so use GFP_NOFS
- */
-static struct inode *btrfs_alloc_inode(struct super_block *sb)
-{
- struct btrfs_inode *ei;
-
- ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
- if (!ei)
- return NULL;
- return &ei->vfs_inode;
-}
-
-static void btrfs_destroy_inode(struct inode *inode)
-{
- WARN_ON(!list_empty(&inode->i_dentry));
- WARN_ON(inode->i_data.nrpages);
-
- kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
-}
-
-static void init_once(void * foo, struct kmem_cache * cachep,
- unsigned long flags)
-{
- struct btrfs_inode *ei = (struct btrfs_inode *) foo;
-
- if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
- SLAB_CTOR_CONSTRUCTOR) {
- inode_init_once(&ei->vfs_inode);
- }
-}
-
-static int init_inodecache(void)
-{
- btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache",
- sizeof(struct btrfs_inode),
- 0, (SLAB_RECLAIM_ACCOUNT|
- SLAB_MEM_SPREAD),
- init_once, NULL);
- btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache",
- sizeof(struct btrfs_trans_handle),
- 0, (SLAB_RECLAIM_ACCOUNT|
- SLAB_MEM_SPREAD),
- NULL, NULL);
- btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache",
- sizeof(struct btrfs_transaction),
- 0, (SLAB_RECLAIM_ACCOUNT|
- SLAB_MEM_SPREAD),
- NULL, NULL);
- btrfs_path_cachep = kmem_cache_create("btrfs_path_cache",
- sizeof(struct btrfs_transaction),
- 0, (SLAB_RECLAIM_ACCOUNT|
- SLAB_MEM_SPREAD),
- NULL, NULL);
- btrfs_bit_radix_cachep = kmem_cache_create("btrfs_radix",
- 256,
- 0, (SLAB_RECLAIM_ACCOUNT|
- SLAB_MEM_SPREAD |
- SLAB_DESTROY_BY_RCU),
- NULL, NULL);
- if (btrfs_inode_cachep == NULL || btrfs_trans_handle_cachep == NULL ||
- btrfs_transaction_cachep == NULL || btrfs_bit_radix_cachep == NULL)
- return -ENOMEM;
- return 0;
-}
-
-static void destroy_inodecache(void)
-{
- kmem_cache_destroy(btrfs_inode_cachep);
- kmem_cache_destroy(btrfs_trans_handle_cachep);
- kmem_cache_destroy(btrfs_transaction_cachep);
- kmem_cache_destroy(btrfs_bit_radix_cachep);
- kmem_cache_destroy(btrfs_path_cachep);
-}
-
-static int btrfs_get_sb(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *data, struct vfsmount *mnt)
+static int btrfs_freeze(struct super_block *sb)
{
- return get_sb_bdev(fs_type, flags, dev_name, data,
- btrfs_fill_super, mnt);
-}
-
-
-static int btrfs_getattr(struct vfsmount *mnt,
- struct dentry *dentry, struct kstat *stat)
-{
- struct inode *inode = dentry->d_inode;
- generic_fillattr(inode, stat);
- stat->blksize = 256 * 1024;
+ struct btrfs_root *root = btrfs_sb(sb);
+ mutex_lock(&root->fs_info->transaction_kthread_mutex);
+ mutex_lock(&root->fs_info->cleaner_mutex);
return 0;
}
-static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
+static int btrfs_unfreeze(struct super_block *sb)
{
- struct btrfs_root *root = btrfs_sb(dentry->d_sb);
- struct btrfs_super_block *disk_super = root->fs_info->disk_super;
-
- 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_bavail = buf->f_bfree;
- buf->f_bsize = dentry->d_sb->s_blocksize;
- buf->f_type = BTRFS_SUPER_MAGIC;
+ struct btrfs_root *root = btrfs_sb(sb);
+ mutex_unlock(&root->fs_info->cleaner_mutex);
+ mutex_unlock(&root->fs_info->transaction_kthread_mutex);
return 0;
}
-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,
-};
-
static struct super_operations btrfs_super_ops = {
.delete_inode = btrfs_delete_inode,
.put_super = btrfs_put_super,
- .read_inode = btrfs_read_locked_inode,
.write_super = btrfs_write_super,
.sync_fs = btrfs_sync_fs,
+ .show_options = generic_show_options,
.write_inode = btrfs_write_inode,
.dirty_inode = btrfs_dirty_inode,
.alloc_inode = btrfs_alloc_inode,
.destroy_inode = btrfs_destroy_inode,
.statfs = btrfs_statfs,
+ .remount_fs = btrfs_remount,
+ .freeze_fs = btrfs_freeze,
+ .unfreeze_fs = btrfs_unfreeze,
};
-static struct inode_operations btrfs_dir_inode_operations = {
- .lookup = btrfs_lookup,
- .create = btrfs_create,
- .unlink = btrfs_unlink,
- .mkdir = btrfs_mkdir,
- .rmdir = btrfs_rmdir,
+static const struct file_operations btrfs_ctl_fops = {
+ .unlocked_ioctl = btrfs_control_ioctl,
+ .compat_ioctl = btrfs_control_ioctl,
+ .owner = THIS_MODULE,
};
-static struct inode_operations btrfs_dir_ro_inode_operations = {
- .lookup = btrfs_lookup,
+static struct miscdevice btrfs_misc = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "btrfs-control",
+ .fops = &btrfs_ctl_fops
};
-static struct file_operations btrfs_dir_file_operations = {
- .llseek = generic_file_llseek,
- .read = generic_read_dir,
- .readdir = btrfs_readdir,
- .ioctl = btrfs_ioctl,
-};
-
-static struct address_space_operations btrfs_aops = {
- .readpage = btrfs_readpage,
- .writepage = btrfs_writepage,
- .sync_page = block_sync_page,
- .prepare_write = btrfs_prepare_write,
- .commit_write = btrfs_commit_write,
-};
-
-static struct inode_operations btrfs_file_inode_operations = {
- .truncate = btrfs_truncate,
- .getattr = btrfs_getattr,
-};
+static int btrfs_interface_init(void)
+{
+ return misc_register(&btrfs_misc);
+}
-static struct file_operations btrfs_file_operations = {
- .llseek = generic_file_llseek,
- .read = do_sync_read,
- .aio_read = btrfs_file_aio_read,
- .write = btrfs_file_write,
- .mmap = generic_file_mmap,
- .open = generic_file_open,
- .ioctl = btrfs_ioctl,
- .fsync = btrfs_sync_file,
-};
+static void btrfs_interface_exit(void)
+{
+ if (misc_deregister(&btrfs_misc) < 0)
+ printk(KERN_INFO "misc_deregister failed for control device");
+}
static int __init init_btrfs_fs(void)
{
int err;
- printk("btrfs loaded!\n");
- err = init_inodecache();
+
+ err = btrfs_init_sysfs();
if (err)
return err;
- kset_set_kset_s(&btrfs_subsys, fs_subsys);
- err = subsystem_register(&btrfs_subsys);
+
+ err = btrfs_init_cachep();
if (err)
- goto out;
- return register_filesystem(&btrfs_fs_type);
-out:
- destroy_inodecache();
+ goto free_sysfs;
+
+ err = extent_io_init();
+ if (err)
+ goto free_cachep;
+
+ err = extent_map_init();
+ if (err)
+ goto free_extent_io;
+
+ err = btrfs_interface_init();
+ if (err)
+ goto free_extent_map;
+
+ err = register_filesystem(&btrfs_fs_type);
+ if (err)
+ goto unregister_ioctl;
+
+ printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION);
+ return 0;
+
+unregister_ioctl:
+ btrfs_interface_exit();
+free_extent_map:
+ extent_map_exit();
+free_extent_io:
+ extent_io_exit();
+free_cachep:
+ btrfs_destroy_cachep();
+free_sysfs:
+ btrfs_exit_sysfs();
return err;
}
static void __exit exit_btrfs_fs(void)
{
- destroy_inodecache();
+ btrfs_destroy_cachep();
+ extent_map_exit();
+ extent_io_exit();
+ btrfs_interface_exit();
unregister_filesystem(&btrfs_fs_type);
- subsystem_unregister(&btrfs_subsys);
- printk("btrfs unloaded\n");
+ btrfs_exit_sysfs();
+ btrfs_cleanup_fs_uuids();
+ btrfs_zlib_exit();
}
module_init(init_btrfs_fs)
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff