#define BTRFS_MAGIC "_BtRfS_M"
#define BTRFS_ROOT_TREE_OBJECTID 1ULL
-#define BTRFS_DEV_TREE_OBJECTID 2ULL
-#define BTRFS_EXTENT_TREE_OBJECTID 3ULL
-#define BTRFS_FS_TREE_OBJECTID 4ULL
-#define BTRFS_ROOT_TREE_DIR_OBJECTID 5ULL
-#define BTRFS_FIRST_FREE_OBJECTID 6ULL
+#define BTRFS_EXTENT_TREE_OBJECTID 2ULL
+#define BTRFS_FS_TREE_OBJECTID 3ULL
+#define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
+#define BTRFS_FIRST_FREE_OBJECTID 5ULL
/*
* we can actually store much bigger names, but lets not confuse the rest
__le64 total_blocks;
__le64 blocks_used;
__le64 root_dir_objectid;
- __le64 last_device_id;
- /* fields below here vary with the underlying disk */
- __le64 device_block_start;
- __le64 device_num_blocks;
- __le64 device_root;
- __le64 device_id;
} __attribute__ ((__packed__));
/*
u8 csum;
} __attribute__ ((__packed__));
-struct btrfs_device_item {
- __le16 pathlen;
- __le64 device_id;
-} __attribute__ ((__packed__));
-
/* tag for the radix tree of block groups in ram */
#define BTRFS_BLOCK_GROUP_DIRTY 0
#define BTRFS_BLOCK_GROUP_AVAIL 1
spinlock_t hash_lock;
struct btrfs_root *extent_root;
struct btrfs_root *tree_root;
- struct btrfs_root *dev_root;
struct radix_tree_root fs_roots_radix;
struct radix_tree_root pending_del_radix;
struct radix_tree_root pinned_radix;
- struct radix_tree_root dev_radix;
struct radix_tree_root block_group_radix;
struct radix_tree_root block_group_data_radix;
struct radix_tree_root extent_map_radix;
*/
#define BTRFS_BLOCK_GROUP_ITEM_KEY 34
-/*
- * dev items list the devices that make up the FS
- */
-#define BTRFS_DEV_ITEM_KEY 35
-
/*
* string items are for debugging. They just store a short string of
* data in the FS
s->root_dir_objectid = cpu_to_le64(val);
}
-static inline u64 btrfs_super_last_device_id(struct btrfs_super_block *s)
-{
- return le64_to_cpu(s->last_device_id);
-}
-
-static inline void btrfs_set_super_last_device_id(struct btrfs_super_block *s,
- u64 val)
-{
- s->last_device_id = cpu_to_le64(val);
-}
-
-static inline u64 btrfs_super_device_id(struct btrfs_super_block *s)
-{
- return le64_to_cpu(s->device_id);
-}
-
-static inline void btrfs_set_super_device_id(struct btrfs_super_block *s,
- u64 val)
-{
- s->device_id = cpu_to_le64(val);
-}
-
-static inline u64 btrfs_super_device_block_start(struct btrfs_super_block *s)
-{
- return le64_to_cpu(s->device_block_start);
-}
-
-static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
- *s, u64 val)
-{
- s->device_block_start = cpu_to_le64(val);
-}
-
-static inline u64 btrfs_super_device_num_blocks(struct btrfs_super_block *s)
-{
- return le64_to_cpu(s->device_num_blocks);
-}
-
-static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
- *s, u64 val)
-{
- s->device_num_blocks = cpu_to_le64(val);
-}
-
-static inline u64 btrfs_super_device_root(struct btrfs_super_block *s)
-{
- return le64_to_cpu(s->device_root);
-}
-
-static inline void btrfs_set_super_device_root(struct btrfs_super_block
- *s, u64 val)
-{
- s->device_root = cpu_to_le64(val);
-}
-
-
static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
{
return (u8 *)l->items;
e->num_blocks = cpu_to_le64(val);
}
-static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
-{
- return le16_to_cpu(d->pathlen);
-}
-
-static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
- u16 val)
-{
- d->pathlen = cpu_to_le16(val);
-}
-
-static inline u64 btrfs_device_id(struct btrfs_device_item *d)
-{
- return le64_to_cpu(d->device_id);
-}
-
-static inline void btrfs_set_device_id(struct btrfs_device_item *d,
- u64 val)
-{
- d->device_id = cpu_to_le64(val);
-}
-
static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
{
return sb->s_fs_info;
#include "transaction.h"
#include "btrfs_inode.h"
-struct dev_lookup {
- u64 block_start;
- u64 num_blocks;
- u64 device_id;
- struct block_device *bdev;
-};
-
-int btrfs_insert_dev_radix(struct btrfs_root *root,
- struct block_device *bdev,
- u64 device_id,
- u64 block_start,
- u64 num_blocks)
-{
- struct dev_lookup *lookup;
- int ret;
-
- lookup = kmalloc(sizeof(*lookup), GFP_NOFS);
- if (!lookup)
- return -ENOMEM;
- lookup->block_start = block_start;
- lookup->num_blocks = num_blocks;
- lookup->bdev = bdev;
- lookup->device_id = device_id;
-
- ret = radix_tree_insert(&root->fs_info->dev_radix, block_start +
- num_blocks - 1, lookup);
- return ret;
-}
-
u64 bh_blocknr(struct buffer_head *bh)
{
- int blkbits = bh->b_page->mapping->host->i_blkbits;
- u64 blocknr = bh->b_page->index << (PAGE_CACHE_SHIFT - blkbits);
- unsigned long offset;
-
- if (PageHighMem(bh->b_page))
- offset = (unsigned long)bh->b_data;
- else
- offset = bh->b_data - (char *)page_address(bh->b_page);
- blocknr += offset >> (PAGE_CACHE_SHIFT - blkbits);
- return blocknr;
+ return bh->b_blocknr;
}
static int check_tree_block(struct btrfs_root *root, struct buffer_head *buf)
int btrfs_map_bh_to_logical(struct btrfs_root *root, struct buffer_head *bh,
u64 logical)
{
- struct dev_lookup *lookup[2];
-
- int ret;
-
if (logical == 0) {
bh->b_bdev = NULL;
bh->b_blocknr = 0;
set_buffer_mapped(bh);
- return 0;
- }
- root = root->fs_info->dev_root;
- ret = radix_tree_gang_lookup(&root->fs_info->dev_radix,
- (void **)lookup,
- (unsigned long)logical,
- ARRAY_SIZE(lookup));
- if (ret == 0 || lookup[0]->block_start > logical ||
- lookup[0]->block_start + lookup[0]->num_blocks <= logical) {
- ret = -ENOENT;
- goto out;
+ } else {
+ map_bh(bh, root->fs_info->sb, logical);
}
- bh->b_bdev = lookup[0]->bdev;
- bh->b_blocknr = logical - lookup[0]->block_start;
- set_buffer_mapped(bh);
- ret = 0;
-out:
- return ret;
+ return 0;
}
struct buffer_head *btrfs_find_create_tree_block(struct btrfs_root *root,
u64 highest_inode;
int ret = 0;
-printk("read_fs_root looking for %Lu %Lu %u\n", location->objectid, location->offset, location->flags);
root = radix_tree_lookup(&fs_info->fs_roots_radix,
(unsigned long)location->objectid);
- if (root) {
-printk("found %p in cache\n", root);
+ if (root)
return root;
- }
root = kmalloc(sizeof(*root), GFP_NOFS);
- if (!root) {
-printk("failed1\n");
+ if (!root)
return ERR_PTR(-ENOMEM);
- }
if (location->offset == (u64)-1) {
ret = find_and_setup_root(fs_info->sb->s_blocksize,
fs_info->tree_root, fs_info,
location->objectid, root);
if (ret) {
-printk("failed2\n");
kfree(root);
return ERR_PTR(ret);
}
BUG_ON(!path);
ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
if (ret != 0) {
-printk("internal search_slot gives us %d\n", ret);
if (ret > 0)
ret = -ENOENT;
goto out;
btrfs_root_blocknr(&root->root_item));
BUG_ON(!root->node);
insert:
-printk("inserting %p\n", root);
root->ref_cows = 1;
ret = radix_tree_insert(&fs_info->fs_roots_radix,
(unsigned long)root->root_key.objectid,
root);
if (ret) {
-printk("radix_tree_insert gives us %d\n", ret);
brelse(root->node);
kfree(root);
return ERR_PTR(ret);
if (ret == 0) {
root->highest_inode = highest_inode;
root->last_inode_alloc = highest_inode;
-printk("highest inode is %Lu\n", highest_inode);
}
-printk("all worked\n");
return root;
}
-static int btrfs_open_disk(struct btrfs_root *root, u64 device_id,
- u64 block_start, u64 num_blocks,
- char *filename, int name_len)
-{
- char *null_filename;
- struct block_device *bdev;
- int ret;
-
- null_filename = kmalloc(name_len + 1, GFP_NOFS);
- if (!null_filename)
- return -ENOMEM;
- memcpy(null_filename, filename, name_len);
- null_filename[name_len] = '\0';
-
- bdev = open_bdev_excl(null_filename, O_RDWR, root->fs_info->sb);
- if (IS_ERR(bdev)) {
- ret = PTR_ERR(bdev);
- goto out;
- }
- set_blocksize(bdev, root->fs_info->sb->s_blocksize);
- ret = btrfs_insert_dev_radix(root, bdev, device_id,
- block_start, num_blocks);
- BUG_ON(ret);
- ret = 0;
-out:
- kfree(null_filename);
- return ret;
-}
-
-static int read_device_info(struct btrfs_root *root)
-{
- struct btrfs_path *path;
- int ret;
- struct btrfs_key key;
- struct btrfs_leaf *leaf;
- struct btrfs_device_item *dev_item;
- int nritems;
- int slot;
-
- root = root->fs_info->dev_root;
-
- path = btrfs_alloc_path();
- if (!path)
- return -ENOMEM;
- key.objectid = 0;
- key.offset = 0;
- key.flags = 0;
- btrfs_set_key_type(&key, BTRFS_DEV_ITEM_KEY);
-
- mutex_lock(&root->fs_info->fs_mutex);
- ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
- leaf = btrfs_buffer_leaf(path->nodes[0]);
- nritems = btrfs_header_nritems(&leaf->header);
- while(1) {
- slot = path->slots[0];
- if (slot >= nritems) {
- 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];
- }
- btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key);
- if (btrfs_key_type(&key) != BTRFS_DEV_ITEM_KEY) {
- path->slots[0]++;
- continue;
- }
- dev_item = btrfs_item_ptr(leaf, slot, struct btrfs_device_item);
-printk("found key %Lu %Lu\n", key.objectid, key.offset);
- if (btrfs_device_id(dev_item) !=
- btrfs_super_device_id(root->fs_info->disk_super)) {
- ret = btrfs_open_disk(root, btrfs_device_id(dev_item),
- key.objectid, key.offset,
- (char *)(dev_item + 1),
- btrfs_device_pathlen(dev_item));
- BUG_ON(ret);
- }
- path->slots[0]++;
- }
- btrfs_free_path(path);
- mutex_unlock(&root->fs_info->fs_mutex);
- return 0;
-}
-
struct btrfs_root *open_ctree(struct super_block *sb)
{
struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
GFP_NOFS);
- struct btrfs_root *dev_root = kmalloc(sizeof(struct btrfs_root),
- GFP_NOFS);
struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
GFP_NOFS);
struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info),
GFP_NOFS);
int ret;
struct btrfs_super_block *disk_super;
- struct dev_lookup *dev_lookup;
init_bit_radix(&fs_info->pinned_radix);
init_bit_radix(&fs_info->pending_del_radix);
init_bit_radix(&fs_info->extent_map_radix);
INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS);
- INIT_RADIX_TREE(&fs_info->dev_radix, GFP_NOFS);
INIT_RADIX_TREE(&fs_info->block_group_radix, GFP_KERNEL);
INIT_RADIX_TREE(&fs_info->block_group_data_radix, GFP_KERNEL);
INIT_LIST_HEAD(&fs_info->trans_list);
fs_info->running_transaction = NULL;
fs_info->tree_root = tree_root;
fs_info->extent_root = extent_root;
- fs_info->dev_root = dev_root;
fs_info->sb = sb;
fs_info->btree_inode = new_inode(sb);
fs_info->btree_inode->i_ino = 1;
mutex_init(&fs_info->trans_mutex);
mutex_init(&fs_info->fs_mutex);
- __setup_root(sb->s_blocksize, dev_root,
- fs_info, BTRFS_DEV_TREE_OBJECTID);
-
__setup_root(sb->s_blocksize, tree_root,
fs_info, BTRFS_ROOT_TREE_OBJECTID);
- dev_lookup = kmalloc(sizeof(*dev_lookup), GFP_NOFS);
- dev_lookup->block_start = 0;
- dev_lookup->num_blocks = (u32)-2;
- dev_lookup->bdev = sb->s_bdev;
- dev_lookup->device_id = 0;
- ret = radix_tree_insert(&fs_info->dev_radix, (u32)-2, dev_lookup);
- BUG_ON(ret);
fs_info->sb_buffer = read_tree_block(tree_root,
BTRFS_SUPER_INFO_OFFSET /
sb->s_blocksize);
btrfs_super_total_blocks(disk_super) <<
fs_info->btree_inode->i_blkbits);
- radix_tree_delete(&fs_info->dev_radix, (u32)-2);
- dev_lookup->block_start = btrfs_super_device_block_start(disk_super);
- dev_lookup->num_blocks = btrfs_super_device_num_blocks(disk_super);
- dev_lookup->device_id = btrfs_super_device_id(disk_super);
-
- ret = radix_tree_insert(&fs_info->dev_radix,
- dev_lookup->block_start +
- dev_lookup->num_blocks - 1, dev_lookup);
- BUG_ON(ret);
-
fs_info->disk_super = disk_super;
-
- dev_root->node = read_tree_block(tree_root,
- btrfs_super_device_root(disk_super));
-
- ret = read_device_info(dev_root);
- BUG_ON(ret);
-
tree_root->node = read_tree_block(tree_root,
btrfs_super_root(disk_super));
BUG_ON(!tree_root->node);
return 0;
}
-static int free_dev_radix(struct btrfs_fs_info *fs_info)
-{
- struct dev_lookup *lookup[8];
- struct block_device *super_bdev = fs_info->sb->s_bdev;
- int ret;
- int i;
- while(1) {
- ret = radix_tree_gang_lookup(&fs_info->dev_radix,
- (void **)lookup, 0,
- ARRAY_SIZE(lookup));
- if (!ret)
- break;
- for (i = 0; i < ret; i++) {
- if (lookup[i]->bdev != super_bdev)
- close_bdev_excl(lookup[i]->bdev);
- radix_tree_delete(&fs_info->dev_radix,
- lookup[i]->block_start +
- lookup[i]->num_blocks - 1);
- kfree(lookup[i]);
- }
- }
- return 0;
-}
-
int close_ctree(struct btrfs_root *root)
{
int ret;
if (fs_info->extent_root->node)
btrfs_block_release(fs_info->extent_root,
fs_info->extent_root->node);
- if (fs_info->dev_root->node)
- btrfs_block_release(fs_info->dev_root,
- fs_info->dev_root->node);
if (fs_info->tree_root->node)
btrfs_block_release(fs_info->tree_root,
fs_info->tree_root->node);
truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
iput(fs_info->btree_inode);
- free_dev_radix(fs_info);
btrfs_free_block_groups(root->fs_info);
del_fs_roots(fs_info);
kfree(fs_info->extent_root);
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)
- 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;
- 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);
- btrfs_btree_balance_dirty(root);
-
- return ret;
-}
-
static int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int
cmd, unsigned long arg)
{
ret = create_snapshot(root, vol_args.name, namelen);
WARN_ON(ret);
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;
}
projects / karo-tx-linux.git / commitdiff