int i;
int total_found = 0;
- ret = radix_tree_gang_lookup(radix, (void *)&gang, 0, ARRAY_SIZE(gang));
+ ret = radix_tree_gang_lookup(radix, (void **)gang, 0, ARRAY_SIZE(gang));
for (i = 0; i < ret && nr > 0; i++) {
found = 0;
bits = gang[i];
struct crypto_hash;
struct btrfs_fs_info {
- struct btrfs_root *fs_root;
struct btrfs_root *extent_root;
struct btrfs_root *tree_root;
struct btrfs_root *inode_root;
struct btrfs_key current_insert;
struct btrfs_key last_insert;
+ struct radix_tree_root fs_roots_radix;
struct radix_tree_root pending_del_radix;
struct radix_tree_root pinned_radix;
u64 last_inode_alloc;
struct btrfs_root_item root_item;
struct btrfs_key root_key;
struct btrfs_fs_info *fs_info;
+ struct inode *inode;
+ u64 objectid;
+ u64 last_trans;
u32 blocksize;
int ref_cows;
u32 type;
static inline void btrfs_set_key_overflow(struct btrfs_key *key, u32 over)
{
- BUG_ON(over > BTRFS_KEY_OVERFLOW_MAX);
+ BUG_ON(over >= BTRFS_KEY_OVERFLOW_MAX);
over = over << BTRFS_KEY_OVERFLOW_SHIFT;
key->flags = (key->flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
}
u32 over)
{
u32 flags = btrfs_disk_key_flags(key);
- BUG_ON(over > BTRFS_KEY_OVERFLOW_MAX);
+ BUG_ON(over >= BTRFS_KEY_OVERFLOW_MAX);
over = over << BTRFS_KEY_OVERFLOW_SHIFT;
flags = (flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
btrfs_set_disk_key_flags(key, flags);
s->blocknr = cpu_to_le64(val);
}
+static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
+{
+ return le64_to_cpu(s->generation);
+}
+
+static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
+ u64 val)
+{
+ s->generation = cpu_to_le64(val);
+}
+
static inline u64 btrfs_super_root(struct btrfs_super_block *s)
{
return le64_to_cpu(s->root);
#include <linux/crypto.h>
#include <linux/scatterlist.h>
#include <linux/swap.h>
+#include <linux/radix-tree.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
+#include "btrfs_inode.h"
static int check_tree_block(struct btrfs_root *root, struct buffer_head *buf)
{
static int btree_writepage(struct page *page, struct writeback_control *wbc)
{
struct buffer_head *bh;
- struct btrfs_root *root = btrfs_sb(page->mapping->host->i_sb);
+ struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
struct buffer_head *head;
if (!page_has_buffers(page)) {
create_empty_buffers(page, root->fs_info->sb->s_blocksize,
u64 objectid)
{
root->node = NULL;
+ root->inode = NULL;
root->commit_root = NULL;
root->blocksize = blocksize;
root->ref_cows = 0;
root->fs_info = fs_info;
+ root->objectid = objectid;
+ root->last_trans = 0;
memset(&root->root_key, 0, sizeof(root->root_key));
memset(&root->root_item, 0, sizeof(root->root_item));
return 0;
return 0;
}
+struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
+ struct btrfs_key *location)
+{
+ struct btrfs_root *root;
+ struct btrfs_root *tree_root = fs_info->tree_root;
+ struct btrfs_path *path;
+ struct btrfs_leaf *l;
+ int ret = 0;
+
+printk("read_fs_root looking for %Lu %Lu %u\n", location->objectid, location->offset, location->flags);
+ root = kmalloc(sizeof(*root), GFP_NOFS);
+ if (!root) {
+printk("failed1\n");
+ 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);
+ }
+ goto insert;
+ }
+
+ __setup_root(fs_info->sb->s_blocksize, root, fs_info,
+ location->objectid);
+
+ path = btrfs_alloc_path();
+ 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;
+ }
+ l = btrfs_buffer_leaf(path->nodes[0]);
+ memcpy(&root->root_item,
+ btrfs_item_ptr(l, path->slots[0], struct btrfs_root_item),
+ sizeof(root->root_item));
+ memcpy(&root->root_key, location, sizeof(*location));
+ ret = 0;
+out:
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
+ if (ret) {
+ kfree(root);
+ return ERR_PTR(ret);
+ }
+ root->node = read_tree_block(root,
+ 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);
+ if (ret) {
+printk("radix_tree_insert gives us %d\n", ret);
+ brelse(root->node);
+ kfree(root);
+ return ERR_PTR(ret);
+ }
+printk("all worked\n");
+ return root;
+}
+
struct btrfs_root *open_ctree(struct super_block *sb)
{
- struct btrfs_root *root = kmalloc(sizeof(struct btrfs_root),
- GFP_NOFS);
struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
GFP_NOFS);
struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
init_bit_radix(&fs_info->pinned_radix);
init_bit_radix(&fs_info->pending_del_radix);
+ INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS);
sb_set_blocksize(sb, 4096);
fs_info->running_transaction = NULL;
- fs_info->fs_root = root;
fs_info->tree_root = tree_root;
fs_info->extent_root = extent_root;
fs_info->inode_root = inode_root;
fs_info->btree_inode->i_nlink = 1;
fs_info->btree_inode->i_size = sb->s_bdev->bd_inode->i_size;
fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
+ BTRFS_I(fs_info->btree_inode)->root = tree_root;
+ memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
+ sizeof(struct btrfs_key));
insert_inode_hash(fs_info->btree_inode);
mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
fs_info->hash_tfm = crypto_alloc_hash("sha256", 0, CRYPTO_ALG_ASYNC);
BTRFS_SUPER_INFO_OFFSET /
sb->s_blocksize);
- if (!fs_info->sb_buffer) {
+ if (!fs_info->sb_buffer)
return NULL;
- }
disk_super = (struct btrfs_super_block *)fs_info->sb_buffer->b_data;
- if (!btrfs_super_root(disk_super)) {
+ if (!btrfs_super_root(disk_super))
return NULL;
- }
+
fs_info->disk_super = disk_super;
tree_root->node = read_tree_block(tree_root,
btrfs_super_root(disk_super));
BTRFS_INODE_MAP_OBJECTID, inode_root);
BUG_ON(ret);
- ret = find_and_setup_root(sb->s_blocksize, tree_root, fs_info,
- BTRFS_FS_TREE_OBJECTID, root);
- BUG_ON(ret);
- root->commit_root = root->node;
- get_bh(root->node);
- root->ref_cows = 1;
- root->fs_info->generation = root->root_key.offset + 1;
- ret = btrfs_find_highest_inode(root, &root->fs_info->last_inode_alloc);
+ fs_info->generation = btrfs_super_generation(disk_super) + 1;
+ ret = btrfs_find_highest_inode(tree_root, &fs_info->last_inode_alloc);
if (ret == 0)
fs_info->highest_inode = fs_info->last_inode_alloc;
memset(&fs_info->kobj, 0, sizeof(fs_info->kobj));
kobject_set_name(&fs_info->kobj, "%s", sb->s_id);
kobject_register(&fs_info->kobj);
mutex_unlock(&fs_info->fs_mutex);
- return root;
+ return tree_root;
}
int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
return 0;
}
+int del_fs_roots(struct btrfs_fs_info *fs_info)
+{
+ int ret;
+ struct btrfs_root *gang[8];
+ int i;
+
+ while(1) {
+ ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
+ (void **)gang, 0,
+ ARRAY_SIZE(gang));
+ if (!ret)
+ break;
+ for (i = 0; i < ret; i++) {
+ radix_tree_delete(&fs_info->fs_roots_radix,
+ (unsigned long)gang[i]);
+ if (gang[i]->inode)
+ iput(gang[i]->inode);
+ else
+ printk("no inode for root %p\n", gang[i]);
+ if (gang[i]->node)
+ brelse(gang[i]->node);
+ if (gang[i]->commit_root)
+ brelse(gang[i]->commit_root);
+ kfree(gang[i]);
+ }
+ }
+ return 0;
+}
+
int close_ctree(struct btrfs_root *root)
{
int ret;
struct btrfs_trans_handle *trans;
+ struct btrfs_fs_info *fs_info = root->fs_info;
- mutex_lock(&root->fs_info->fs_mutex);
+ mutex_lock(&fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
btrfs_commit_transaction(trans, root);
/* run commit again to drop the original snapshot */
ret = btrfs_write_and_wait_transaction(NULL, root);
BUG_ON(ret);
write_ctree_super(NULL, root);
- mutex_unlock(&root->fs_info->fs_mutex);
-
- if (root->node)
- btrfs_block_release(root, root->node);
- if (root->fs_info->extent_root->node)
- btrfs_block_release(root->fs_info->extent_root,
- root->fs_info->extent_root->node);
- if (root->fs_info->inode_root->node)
- btrfs_block_release(root->fs_info->inode_root,
- root->fs_info->inode_root->node);
- if (root->fs_info->tree_root->node)
- btrfs_block_release(root->fs_info->tree_root,
- root->fs_info->tree_root->node);
- btrfs_block_release(root, root->commit_root);
- btrfs_block_release(root, root->fs_info->sb_buffer);
- crypto_free_hash(root->fs_info->hash_tfm);
- truncate_inode_pages(root->fs_info->btree_inode->i_mapping, 0);
- iput(root->fs_info->btree_inode);
- kfree(root->fs_info->extent_root);
- kfree(root->fs_info->inode_root);
- kfree(root->fs_info->tree_root);
- kobject_unregister(&root->fs_info->kobj);
- kfree(root);
+ mutex_unlock(&fs_info->fs_mutex);
+
+ if (fs_info->extent_root->node)
+ btrfs_block_release(fs_info->extent_root,
+ fs_info->extent_root->node);
+ if (fs_info->inode_root->node)
+ btrfs_block_release(fs_info->inode_root,
+ fs_info->inode_root->node);
+ if (fs_info->tree_root->node)
+ btrfs_block_release(fs_info->tree_root,
+ fs_info->tree_root->node);
+ btrfs_block_release(root, fs_info->sb_buffer);
+ crypto_free_hash(fs_info->hash_tfm);
+ truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
+ iput(fs_info->btree_inode);
+ del_fs_roots(fs_info);
+ kfree(fs_info->extent_root);
+ kfree(fs_info->inode_root);
+ kfree(fs_info->tree_root);
+ kobject_unregister(&fs_info->kobj);
return 0;
}
struct buffer_head *btrfs_find_tree_block(struct btrfs_root *root, u64 blocknr);
int btrfs_csum_data(struct btrfs_root * root, char *data, size_t len,
char *result);
+struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
+ struct btrfs_key *location);
#endif
{
struct btrfs_path *path;
struct btrfs_root_item *ri;
- int ret;
if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
return 0;
BUG_ON(!path);
mutex_lock(&root->fs_info->fs_mutex);
- ret = btrfs_lookup_inode(NULL, root, path, location, 0);
- if (ret)
- goto out;
- ri = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
- path->slots[0],
- struct btrfs_root_item);
+ *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;
- /* FIXME properly select the root */
- *sub_root = root->fs_info->fs_root;
-out:
+
btrfs_free_path(path);
mutex_unlock(&root->fs_info->fs_mutex);
- return ret;
+ return 0;
}
if (!inode)
return ERR_PTR(-EACCES);
if (inode->i_state & I_NEW) {
+ if (sub_root != root) {
+ ret = radix_tree_insert(
+ &root->fs_info->fs_roots_radix,
+ (unsigned long)sub_root,
+ sub_root);
+printk("adding new root for inode %lu\n", inode->i_ino);
+ igrab(inode);
+ sub_root->inode = inode;
+ }
BTRFS_I(inode)->root = sub_root;
memcpy(&BTRFS_I(inode)->location, &location,
sizeof(location));
struct inode * inode;
struct dentry * root_dentry;
struct btrfs_super_block *disk_super;
- struct btrfs_root *root;
+ struct btrfs_root *tree_root;
struct btrfs_inode *bi;
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_op = &btrfs_super_ops;
sb->s_time_gran = 1;
- root = open_ctree(sb);
+ tree_root = open_ctree(sb);
- if (!root) {
+ if (!tree_root) {
printk("btrfs: open_ctree failed\n");
return -EIO;
}
- sb->s_fs_info = root;
- disk_super = root->fs_info->disk_super;
+ 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));
bi->location.objectid = inode->i_ino;
bi->location.offset = 0;
bi->location.flags = 0;
- bi->root = root->fs_info->tree_root;
+ bi->root = tree_root;
btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY);
if (!inode)
extern struct kmem_cache *btrfs_trans_handle_cachep;
extern struct kmem_cache *btrfs_transaction_cachep;
+#define BTRFS_ROOT_TRANS_TAG 0
+
#define TRANS_MAGIC 0xE1E10E
static void put_transaction(struct btrfs_transaction *transaction)
{
GFP_NOFS);
total_trans++;
BUG_ON(!cur_trans);
+ root->fs_info->generation++;
root->fs_info->running_transaction = cur_trans;
cur_trans->num_writers = 0;
- cur_trans->transid = root->root_key.offset + 1;
+ cur_trans->transid = root->fs_info->generation;
init_waitqueue_head(&cur_trans->writer_wait);
init_waitqueue_head(&cur_trans->commit_wait);
cur_trans->magic = TRANS_MAGIC;
struct btrfs_trans_handle *h =
kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS);
int ret;
+ u64 running_trans_id;
- /* FIXME, use the right root */
- root = root->fs_info->fs_root;
mutex_lock(&root->fs_info->trans_mutex);
ret = join_transaction(root);
BUG_ON(ret);
- h->transid = root->fs_info->running_transaction->transid;
+ running_trans_id = root->fs_info->running_transaction->transid;
+
+ if (root != root->fs_info->tree_root && root->last_trans <
+ running_trans_id) {
+ radix_tree_tag_set(&root->fs_info->fs_roots_radix,
+ (unsigned long)root, BTRFS_ROOT_TRANS_TAG);
+ root->commit_root = root->node;
+ get_bh(root->node);
+ }
+ root->last_trans = running_trans_id;
+ h->transid = running_trans_id;
h->transaction = root->fs_info->running_transaction;
h->blocks_reserved = num_blocks;
h->blocks_used = 0;
{
struct btrfs_transaction *cur_trans;
- /* FIXME, use the right root */
- root = root->fs_info->fs_root;
-
WARN_ON(trans->magic != TRANS_MAGIC);
WARN_ON(trans->magic2 != TRANS_MAGIC);
mutex_lock(&root->fs_info->trans_mutex);
return 0;
}
+struct dirty_root {
+ struct list_head list;
+ struct btrfs_key snap_key;
+ struct buffer_head *commit_root;
+ struct btrfs_root *root;
+};
+
+int add_dirty_roots(struct btrfs_trans_handle *trans,
+ struct radix_tree_root *radix, struct list_head *list)
+{
+ struct dirty_root *dirty;
+ struct btrfs_root *gang[8];
+ struct btrfs_root *root;
+ int i;
+ int ret;
+ int err;
+printk("add dirty\n");
+ while(1) {
+ ret = radix_tree_gang_lookup_tag(radix, (void **)gang, 0,
+ ARRAY_SIZE(gang),
+ BTRFS_ROOT_TRANS_TAG);
+ if (ret == 0)
+ break;
+ for (i = 0; i < ret; i++) {
+ root = gang[i];
+ radix_tree_tag_clear(radix, (unsigned long)root,
+ BTRFS_ROOT_TRANS_TAG);
+ if (root->commit_root == root->node) {
+ WARN_ON(root->node->b_blocknr !=
+ btrfs_root_blocknr(&root->root_item));
+ brelse(root->commit_root);
+ root->commit_root = NULL;
+ continue;
+ }
+ dirty = kmalloc(sizeof(*dirty), GFP_NOFS);
+ BUG_ON(!dirty);
+ memcpy(&dirty->snap_key, &root->root_key,
+ sizeof(root->root_key));
+ dirty->commit_root = root->commit_root;
+ root->commit_root = NULL;
+ dirty->root = root;
+printk("adding dirty root %Lu gen %Lu blocknr %Lu\n", root->root_key.objectid, root->root_key.offset, dirty->commit_root->b_blocknr);
+ root->root_key.offset = root->fs_info->generation;
+ btrfs_set_root_blocknr(&root->root_item,
+ root->node->b_blocknr);
+ err = btrfs_insert_root(trans, root->fs_info->tree_root,
+ &root->root_key,
+ &root->root_item);
+ BUG_ON(err);
+ list_add(&dirty->list, list);
+ }
+ }
+printk("add dirty done\n");
+ return 0;
+}
+
+int drop_dirty_roots(struct btrfs_root *tree_root, struct list_head *list)
+{
+ struct dirty_root *dirty;
+ struct btrfs_trans_handle *trans;
+ int ret;
+
+ while(!list_empty(list)) {
+ dirty = list_entry(list->next, struct dirty_root, list);
+ list_del_init(&dirty->list);
+ trans = btrfs_start_transaction(tree_root, 1);
+printk("drop snapshot root %p, commit_root blocknr %Lu generation %Lu\n", dirty->root, dirty->commit_root->b_blocknr, dirty->snap_key.offset);
+ ret = btrfs_drop_snapshot(trans, dirty->root,
+ dirty->commit_root);
+ BUG_ON(ret);
+
+printk("del root objectid %Lu, offset %Lu\n", dirty->snap_key.objectid, dirty->snap_key.offset);
+ ret = btrfs_del_root(trans, tree_root, &dirty->snap_key);
+ BUG_ON(ret);
+ ret = btrfs_end_transaction(trans, tree_root);
+ BUG_ON(ret);
+ kfree(dirty);
+ }
+ return 0;
+}
+
int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
int ret = 0;
- struct buffer_head *snap;
- struct btrfs_key snap_key;
struct btrfs_transaction *cur_trans;
+ struct list_head dirty_fs_roots;
DEFINE_WAIT(wait);
- /* FIXME, use the right root */
- root = root->fs_info->fs_root;
+ INIT_LIST_HEAD(&dirty_fs_roots);
mutex_lock(&root->fs_info->trans_mutex);
if (trans->transaction->in_commit) {
}
finish_wait(&trans->transaction->writer_wait, &wait);
WARN_ON(cur_trans != trans->transaction);
- if (root->node != root->commit_root) {
- memcpy(&snap_key, &root->root_key, sizeof(snap_key));
- root->root_key.offset++;
- }
-
- if (btrfs_root_blocknr(&root->root_item) != root->node->b_blocknr) {
- btrfs_set_root_blocknr(&root->root_item, root->node->b_blocknr);
- ret = btrfs_insert_root(trans, root->fs_info->tree_root,
- &root->root_key, &root->root_item);
- BUG_ON(ret);
- }
-
+ add_dirty_roots(trans, &root->fs_info->fs_roots_radix, &dirty_fs_roots);
ret = btrfs_commit_tree_roots(trans, root);
BUG_ON(ret);
cur_trans = root->fs_info->running_transaction;
root->fs_info->running_transaction = NULL;
+ btrfs_set_super_generation(root->fs_info->disk_super,
+ root->fs_info->generation + 1);
mutex_unlock(&root->fs_info->trans_mutex);
ret = btrfs_write_and_wait_transaction(trans, root);
BUG_ON(ret);
put_transaction(cur_trans);
mutex_unlock(&root->fs_info->trans_mutex);
kmem_cache_free(btrfs_trans_handle_cachep, trans);
- if (root->node != root->commit_root) {
- trans = btrfs_start_transaction(root, 1);
- snap = root->commit_root;
- root->commit_root = root->node;
- get_bh(root->node);
- ret = btrfs_drop_snapshot(trans, root, snap);
- BUG_ON(ret);
- ret = btrfs_del_root(trans, root->fs_info->tree_root,
- &snap_key);
- BUG_ON(ret);
- root->fs_info->generation = root->root_key.offset + 1;
- ret = btrfs_end_transaction(trans, root);
- BUG_ON(ret);
- }
+ drop_dirty_roots(root->fs_info->tree_root, &dirty_fs_roots);
return ret;
}
projects / linux.git / commitdiff