-#include <linux/module.h>
+/*
+ * 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/fs.h>
#include <linux/blkdev.h>
-#include <linux/crypto.h>
+#include <linux/crc32c.h>
#include <linux/scatterlist.h>
#include <linux/swap.h>
+#include <linux/radix-tree.h>
+#include <linux/writeback.h>
+#include <linux/buffer_head.h> // for block_sync_page
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
+#include "btrfs_inode.h"
-#define PATTERN 0xDEADBEEFUL
-static inline void check_pattern(struct buffer_head *buf)
+#if 0
+static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
{
- if (buf->b_private != (void *)PATTERN)
- WARN_ON(1);
+ if (extent_buffer_blocknr(buf) != btrfs_header_blocknr(buf)) {
+ printk(KERN_CRIT "buf blocknr(buf) is %llu, header is %llu\n",
+ (unsigned long long)extent_buffer_blocknr(buf),
+ (unsigned long long)btrfs_header_blocknr(buf));
+ return 1;
+ }
+ return 0;
}
+#endif
-static inline void set_pattern(struct buffer_head *buf)
+struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
+ u64 blocknr)
{
- buf->b_private = (void *)PATTERN;
+ struct inode *btree_inode = root->fs_info->btree_inode;
+ struct extent_buffer *eb;
+ eb = find_extent_buffer(&BTRFS_I(btree_inode)->extent_tree,
+ blocknr * root->sectorsize,
+ root->sectorsize, GFP_NOFS);
+ if (eb)
+ eb->alloc_addr = (unsigned long)__builtin_return_address(0);
+ return eb;
}
-static int check_tree_block(struct btrfs_root *root, struct buffer_head *buf)
+struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
+ u64 blocknr)
{
- struct btrfs_node *node = btrfs_buffer_node(buf);
- if (buf->b_blocknr != btrfs_header_blocknr(&node->header)) {
- BUG();
- }
- if (root->node && btrfs_header_parentid(&node->header) !=
- btrfs_header_parentid(btrfs_buffer_header(root->node))) {
- BUG();
- }
- return 0;
+ struct inode *btree_inode = root->fs_info->btree_inode;
+ struct extent_buffer *eb;
+ eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->extent_tree,
+ blocknr * root->sectorsize,
+ root->sectorsize, GFP_NOFS);
+ eb->alloc_addr = (unsigned long)__builtin_return_address(0);
+ return eb;
}
-struct buffer_head *btrfs_find_tree_block(struct btrfs_root *root, u64 blocknr)
+struct extent_map *btree_get_extent(struct inode *inode, struct page *page,
+ size_t page_offset, u64 start, u64 end,
+ int create)
{
- struct address_space *mapping = root->fs_info->btree_inode->i_mapping;
- int blockbits = root->fs_info->sb->s_blocksize_bits;
- unsigned long index = blocknr >> (PAGE_CACHE_SHIFT - blockbits);
- struct page *page;
- struct buffer_head *bh;
- struct buffer_head *head;
- struct buffer_head *ret = NULL;
-
- page = find_lock_page(mapping, index);
- if (!page)
- return NULL;
-
- if (!page_has_buffers(page))
- goto out_unlock;
+ struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
+ struct extent_map *em;
+ int ret;
- head = page_buffers(page);
- bh = head;
- do {
- if (buffer_mapped(bh) && bh->b_blocknr == blocknr) {
- ret = bh;
- get_bh(bh);
- goto out_unlock;
- }
- bh = bh->b_this_page;
- } while (bh != head);
-out_unlock:
- unlock_page(page);
- if (ret) {
- touch_buffer(ret);
- check_pattern(ret);
+again:
+ em = lookup_extent_mapping(em_tree, start, end);
+ if (em) {
+ goto out;
}
- page_cache_release(page);
- return ret;
+ em = alloc_extent_map(GFP_NOFS);
+ if (!em) {
+ em = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+ em->start = 0;
+ em->end = (i_size_read(inode) & ~((u64)PAGE_CACHE_SIZE -1)) - 1;
+ em->block_start = 0;
+ em->block_end = em->end;
+ em->bdev = inode->i_sb->s_bdev;
+ ret = add_extent_mapping(em_tree, em);
+ if (ret == -EEXIST) {
+ free_extent_map(em);
+ em = NULL;
+ goto again;
+ } else if (ret) {
+ em = ERR_PTR(ret);
+ }
+out:
+ return em;
}
-struct buffer_head *btrfs_find_create_tree_block(struct btrfs_root *root,
- u64 blocknr)
+static int btree_writepage(struct page *page, struct writeback_control *wbc)
{
- struct address_space *mapping = root->fs_info->btree_inode->i_mapping;
- int blockbits = root->fs_info->sb->s_blocksize_bits;
- unsigned long index = blocknr >> (PAGE_CACHE_SHIFT - blockbits);
- struct page *page;
- struct buffer_head *bh;
- struct buffer_head *head;
- struct buffer_head *ret = NULL;
- u64 first_block = index << (PAGE_CACHE_SHIFT - blockbits);
-
- page = grab_cache_page(mapping, index);
- if (!page)
- return NULL;
-
- if (!page_has_buffers(page))
- create_empty_buffers(page, root->fs_info->sb->s_blocksize, 0);
- head = page_buffers(page);
- bh = head;
- do {
- if (!buffer_mapped(bh)) {
- bh->b_bdev = root->fs_info->sb->s_bdev;
- bh->b_blocknr = first_block;
- set_buffer_mapped(bh);
- set_pattern(bh);
- }
- if (bh->b_blocknr == blocknr) {
- ret = bh;
- get_bh(bh);
- goto out_unlock;
- }
- bh = bh->b_this_page;
- first_block++;
- } while (bh != head);
-out_unlock:
- unlock_page(page);
- if (ret)
- touch_buffer(ret);
- page_cache_release(page);
- return ret;
+ struct extent_map_tree *tree;
+ tree = &BTRFS_I(page->mapping->host)->extent_tree;
+ return extent_write_full_page(tree, page, btree_get_extent, wbc);
+}
+int btree_readpage(struct file *file, struct page *page)
+{
+ struct extent_map_tree *tree;
+ tree = &BTRFS_I(page->mapping->host)->extent_tree;
+ return extent_read_full_page(tree, page, btree_get_extent);
}
-static sector_t max_block(struct block_device *bdev)
+static int btree_releasepage(struct page *page, gfp_t unused_gfp_flags)
{
- sector_t retval = ~((sector_t)0);
- loff_t sz = i_size_read(bdev->bd_inode);
+ struct extent_map_tree *tree;
+ int ret;
- if (sz) {
- unsigned int size = block_size(bdev);
- unsigned int sizebits = blksize_bits(size);
- retval = (sz >> sizebits);
+ BUG_ON(page->private != 1);
+ tree = &BTRFS_I(page->mapping->host)->extent_tree;
+ ret = try_release_extent_mapping(tree, page);
+ if (ret == 1) {
+ ClearPagePrivate(page);
+ set_page_private(page, 0);
+ page_cache_release(page);
}
- return retval;
+ return ret;
}
-static int btree_get_block(struct inode *inode, sector_t iblock,
- struct buffer_head *bh, int create)
+static void btree_invalidatepage(struct page *page, unsigned long offset)
{
- if (iblock >= max_block(inode->i_sb->s_bdev)) {
- if (create)
- return -EIO;
-
- /*
- * for reads, we're just trying to fill a partial page.
- * return a hole, they will have to call get_block again
- * before they can fill it, and they will get -EIO at that
- * time
- */
- return 0;
- }
- bh->b_bdev = inode->i_sb->s_bdev;
- bh->b_blocknr = iblock;
- set_buffer_mapped(bh);
- return 0;
+ struct extent_map_tree *tree;
+ tree = &BTRFS_I(page->mapping->host)->extent_tree;
+ extent_invalidatepage(tree, page, offset);
+ btree_releasepage(page, GFP_NOFS);
}
int btrfs_csum_data(struct btrfs_root * root, char *data, size_t len,
char *result)
{
- struct scatterlist sg;
- struct crypto_hash *tfm = root->fs_info->hash_tfm;
- struct hash_desc desc;
- int ret;
-
- desc.tfm = tfm;
- desc.flags = 0;
- sg_init_one(&sg, data, len);
- spin_lock(&root->fs_info->hash_lock);
- ret = crypto_hash_digest(&desc, &sg, 1, result);
- spin_unlock(&root->fs_info->hash_lock);
- if (ret) {
- printk("sha256 digest failed\n");
- }
- return ret;
+ return 0;
+#if 0
+ u32 crc;
+ crc = crc32c(0, data, len);
+ memcpy(result, &crc, BTRFS_CRC32_SIZE);
+ return 0;
+#endif
}
-static int csum_tree_block(struct btrfs_root *root, struct buffer_head *bh,
+
+#if 0
+static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
int verify)
{
- char result[BTRFS_CSUM_SIZE];
+ return 0;
+ char result[BTRFS_CRC32_SIZE];
int ret;
struct btrfs_node *node;
- return 0;
ret = btrfs_csum_data(root, bh->b_data + BTRFS_CSUM_SIZE,
bh->b_size - BTRFS_CSUM_SIZE, result);
if (ret)
return ret;
if (verify) {
- if (memcmp(bh->b_data, result, BTRFS_CSUM_SIZE)) {
- printk("checksum verify failed on %lu\n",
- bh->b_blocknr);
+ if (memcmp(bh->b_data, result, BTRFS_CRC32_SIZE)) {
+ printk("btrfs: %s checksum verify failed on %llu\n",
+ root->fs_info->sb->s_id,
+ (unsigned long long)bh_blocknr(bh));
return 1;
}
} else {
node = btrfs_buffer_node(bh);
- memcpy(node->header.csum, result, BTRFS_CSUM_SIZE);
+ memcpy(node->header.csum, result, BTRFS_CRC32_SIZE);
}
return 0;
}
+#endif
+#if 0
static int btree_writepage(struct page *page, struct writeback_control *wbc)
{
-#if 0
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,
csum_tree_block(root, bh, 0);
bh = bh->b_this_page;
} while (bh != head);
-#endif
return block_write_full_page(page, btree_get_block, wbc);
}
-
-static int btree_readpage(struct file * file, struct page * page)
-{
- return block_read_full_page(page, btree_get_block);
-}
+#endif
static struct address_space_operations btree_aops = {
.readpage = btree_readpage,
.writepage = btree_writepage,
+ .releasepage = btree_releasepage,
+ .invalidatepage = btree_invalidatepage,
.sync_page = block_sync_page,
};
-struct buffer_head *read_tree_block(struct btrfs_root *root, u64 blocknr)
+int readahead_tree_block(struct btrfs_root *root, u64 blocknr)
{
- struct buffer_head *bh = NULL;
-
- bh = btrfs_find_create_tree_block(root, blocknr);
- if (!bh)
- return bh;
- lock_buffer(bh);
- if (!buffer_uptodate(bh)) {
- get_bh(bh);
- bh->b_end_io = end_buffer_read_sync;
- submit_bh(READ, bh);
- wait_on_buffer(bh);
- if (!buffer_uptodate(bh))
- goto fail;
- csum_tree_block(root, bh, 1);
- set_pattern(bh);
- } else {
- unlock_buffer(bh);
- }
- if (check_tree_block(root, bh))
- BUG();
- return bh;
-fail:
- brelse(bh);
- return NULL;
+ struct extent_buffer *buf = NULL;
+ struct inode *btree_inode = root->fs_info->btree_inode;
+ int ret = 0;
+ buf = btrfs_find_create_tree_block(root, blocknr);
+ if (!buf)
+ return 0;
+ read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
+ buf, 0);
+ free_extent_buffer(buf);
+ return ret;
}
-int dirty_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
- struct buffer_head *buf)
+struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 blocknr)
{
- WARN_ON(atomic_read(&buf->b_count) == 0);
- mark_buffer_dirty(buf);
- return 0;
+ struct extent_buffer *buf = NULL;
+ struct inode *btree_inode = root->fs_info->btree_inode;
+
+ buf = btrfs_find_create_tree_block(root, blocknr);
+ if (!buf)
+ return NULL;
+ read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
+ buf, 1);
+ buf->alloc_addr = (unsigned long)__builtin_return_address(0);
+ return buf;
}
int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
- struct buffer_head *buf)
+ struct extent_buffer *buf)
+{
+ struct inode *btree_inode = root->fs_info->btree_inode;
+ clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, buf);
+ return 0;
+}
+
+int wait_on_tree_block_writeback(struct btrfs_root *root,
+ struct extent_buffer *buf)
+{
+ struct inode *btree_inode = root->fs_info->btree_inode;
+ wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->extent_tree,
+ buf);
+ return 0;
+}
+
+int set_tree_block_dirty(struct btrfs_root *root, struct extent_buffer *buf)
{
- WARN_ON(atomic_read(&buf->b_count) == 0);
- clear_buffer_dirty(buf);
+ struct inode *btree_inode = root->fs_info->btree_inode;
+ set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, buf);
return 0;
}
-static int __setup_root(struct btrfs_super_block *super,
+static int __setup_root(int blocksize,
struct btrfs_root *root,
struct btrfs_fs_info *fs_info,
u64 objectid)
{
root->node = NULL;
+ root->inode = NULL;
root->commit_root = NULL;
- root->blocksize = btrfs_super_blocksize(super);
+ root->sectorsize = blocksize;
+ root->nodesize = blocksize;
+ root->leafsize = blocksize;
root->ref_cows = 0;
root->fs_info = fs_info;
+ root->objectid = objectid;
+ root->last_trans = 0;
+ root->highest_inode = 0;
+ root->last_inode_alloc = 0;
+ root->name = NULL;
memset(&root->root_key, 0, sizeof(root->root_key));
memset(&root->root_item, 0, sizeof(root->root_item));
+ memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
+ memset(&root->root_kobj, 0, sizeof(root->root_kobj));
+ init_completion(&root->kobj_unregister);
+ init_rwsem(&root->snap_sem);
+ root->defrag_running = 0;
+ root->defrag_level = 0;
+ root->root_key.objectid = objectid;
return 0;
}
-static int find_and_setup_root(struct btrfs_super_block *super,
+static int find_and_setup_root(int blocksize,
struct btrfs_root *tree_root,
struct btrfs_fs_info *fs_info,
u64 objectid,
{
int ret;
- __setup_root(super, root, fs_info, objectid);
+ __setup_root(blocksize, root, fs_info, objectid);
ret = btrfs_find_last_root(tree_root, objectid,
&root->root_item, &root->root_key);
BUG_ON(ret);
return 0;
}
-struct btrfs_root *open_ctree(struct super_block *sb,
- struct buffer_head *sb_buffer,
- struct btrfs_super_block *disk_super)
+struct btrfs_root *btrfs_read_fs_root_no_radix(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 extent_buffer *l;
+ u64 highest_inode;
+ int ret = 0;
+
+ root = kzalloc(sizeof(*root), GFP_NOFS);
+ 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) {
+ 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) {
+ if (ret > 0)
+ ret = -ENOENT;
+ goto out;
+ }
+ l = path->nodes[0];
+ read_extent_buffer(l, &root->root_item,
+ btrfs_item_ptr_offset(l, path->slots[0]),
+ sizeof(root->root_item));
+ 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:
+ root->ref_cows = 1;
+ ret = btrfs_find_highest_inode(root, &highest_inode);
+ if (ret == 0) {
+ root->highest_inode = highest_inode;
+ root->last_inode_alloc = highest_inode;
+ }
+ return root;
+}
+
+struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
+ struct btrfs_key *location,
+ const char *name, int namelen)
+{
+ struct btrfs_root *root;
+ int ret;
+
+ root = radix_tree_lookup(&fs_info->fs_roots_radix,
+ (unsigned long)location->objectid);
+ if (root)
+ return root;
+
+ root = btrfs_read_fs_root_no_radix(fs_info, location);
+ if (IS_ERR(root))
+ return root;
+ ret = radix_tree_insert(&fs_info->fs_roots_radix,
+ (unsigned long)root->root_key.objectid,
+ root);
+ if (ret) {
+ free_extent_buffer(root->node);
+ kfree(root);
+ return ERR_PTR(ret);
+ }
+
+ ret = btrfs_set_root_name(root, name, namelen);
+ if (ret) {
+ free_extent_buffer(root->node);
+ kfree(root);
+ return ERR_PTR(ret);
+ }
+
+ ret = btrfs_sysfs_add_root(root);
+ if (ret) {
+ free_extent_buffer(root->node);
+ kfree(root->name);
+ kfree(root);
+ return ERR_PTR(ret);
+ }
+
+ ret = btrfs_find_dead_roots(fs_info->tree_root,
+ root->root_key.objectid, root);
+ BUG_ON(ret);
+
+ 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),
GFP_NOFS);
- struct btrfs_root *inode_root = kmalloc(sizeof(struct btrfs_root),
- GFP_NOFS);
struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info),
GFP_NOFS);
int ret;
+ int err = -EIO;
+ struct btrfs_super_block *disk_super;
- if (!btrfs_super_root(disk_super)) {
- return NULL;
+ if (!extent_root || !tree_root || !fs_info) {
+ err = -ENOMEM;
+ goto fail;
}
init_bit_radix(&fs_info->pinned_radix);
init_bit_radix(&fs_info->pending_del_radix);
- sb_set_blocksize(sb, sb_buffer->b_size);
+ init_bit_radix(&fs_info->extent_ins_radix);
+ INIT_RADIX_TREE(&fs_info->fs_roots_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);
+ INIT_LIST_HEAD(&fs_info->dead_roots);
+ memset(&fs_info->super_kobj, 0, sizeof(fs_info->super_kobj));
+ init_completion(&fs_info->kobj_unregister);
+ sb_set_blocksize(sb, 4096);
fs_info->running_transaction = NULL;
- fs_info->fs_root = root;
+ fs_info->last_trans_committed = 0;
fs_info->tree_root = tree_root;
fs_info->extent_root = extent_root;
- fs_info->inode_root = inode_root;
- fs_info->last_inode_alloc = 0;
- fs_info->last_inode_alloc_dirid = 0;
- fs_info->disk_super = disk_super;
fs_info->sb = sb;
fs_info->btree_inode = new_inode(sb);
fs_info->btree_inode->i_ino = 1;
+ 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;
+ extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree,
+ fs_info->btree_inode->i_mapping,
+ GFP_NOFS);
+ extent_map_tree_init(&fs_info->free_space_cache,
+ fs_info->btree_inode->i_mapping, GFP_NOFS);
+ fs_info->do_barriers = 1;
+ fs_info->closing = 0;
+
+ INIT_DELAYED_WORK(&fs_info->trans_work, btrfs_transaction_cleaner);
+ 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);
- spin_lock_init(&fs_info->hash_lock);
-
- if (!fs_info->hash_tfm || IS_ERR(fs_info->hash_tfm)) {
- printk("failed to allocate sha256 hash\n");
- return NULL;
- }
mutex_init(&fs_info->trans_mutex);
mutex_init(&fs_info->fs_mutex);
- memset(&fs_info->current_insert, 0, sizeof(fs_info->current_insert));
- memset(&fs_info->last_insert, 0, sizeof(fs_info->last_insert));
- __setup_root(disk_super, tree_root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
+ __setup_root(sb->s_blocksize, tree_root,
+ fs_info, BTRFS_ROOT_TREE_OBJECTID);
- fs_info->sb_buffer = read_tree_block(tree_root, sb_buffer->b_blocknr);
+ fs_info->sb_buffer = read_tree_block(tree_root,
+ BTRFS_SUPER_INFO_OFFSET /
+ sb->s_blocksize);
- if (!fs_info->sb_buffer) {
-printk("failed2\n");
- return NULL;
- }
- brelse(sb_buffer);
- sb_buffer = NULL;
- disk_super = (struct btrfs_super_block *)fs_info->sb_buffer->b_data;
- fs_info->disk_super = disk_super;
+ if (!fs_info->sb_buffer)
+ goto fail_iput;
+
+ read_extent_buffer(fs_info->sb_buffer, &fs_info->super_copy, 0,
+ sizeof(fs_info->super_copy));
+
+ read_extent_buffer(fs_info->sb_buffer, fs_info->fsid,
+ (unsigned long)btrfs_super_fsid(fs_info->sb_buffer),
+ BTRFS_FSID_SIZE);
+ disk_super = &fs_info->super_copy;
+ if (!btrfs_super_root(disk_super))
+ goto fail_sb_buffer;
+ i_size_write(fs_info->btree_inode,
+ btrfs_super_total_blocks(disk_super) <<
+ fs_info->btree_inode->i_blkbits);
+
+
+ if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
+ sizeof(disk_super->magic))) {
+ printk("btrfs: valid FS not found on %s\n", sb->s_id);
+ goto fail_sb_buffer;
+ }
tree_root->node = read_tree_block(tree_root,
btrfs_super_root(disk_super));
- BUG_ON(!tree_root->node);
+ if (!tree_root->node)
+ goto fail_sb_buffer;
- ret = find_and_setup_root(disk_super, tree_root, fs_info,
+ mutex_lock(&fs_info->fs_mutex);
+ ret = find_and_setup_root(sb->s_blocksize, tree_root, fs_info,
BTRFS_EXTENT_TREE_OBJECTID, extent_root);
- BUG_ON(ret);
+ if (ret) {
+ mutex_unlock(&fs_info->fs_mutex);
+ goto fail_tree_root;
+ }
- ret = find_and_setup_root(disk_super, tree_root, fs_info,
- BTRFS_INODE_MAP_OBJECTID, inode_root);
- BUG_ON(ret);
+ btrfs_read_block_groups(extent_root);
- ret = find_and_setup_root(disk_super, 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;
- return root;
+ fs_info->generation = btrfs_super_generation(disk_super) + 1;
+ mutex_unlock(&fs_info->fs_mutex);
+ return tree_root;
+
+fail_tree_root:
+ free_extent_buffer(tree_root->node);
+fail_sb_buffer:
+ free_extent_buffer(fs_info->sb_buffer);
+fail_iput:
+ iput(fs_info->btree_inode);
+fail:
+ kfree(extent_root);
+ kfree(tree_root);
+ kfree(fs_info);
+ return ERR_PTR(err);
}
int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
*root)
{
- struct buffer_head *bh = root->fs_info->sb_buffer;
- btrfs_set_super_root(root->fs_info->disk_super,
- root->fs_info->tree_root->node->b_blocknr);
- lock_buffer(bh);
- clear_buffer_dirty(bh);
- csum_tree_block(root, bh, 0);
- bh->b_end_io = end_buffer_write_sync;
- get_bh(bh);
- submit_bh(WRITE, bh);
- wait_on_buffer(bh);
- if (!buffer_uptodate(bh)) {
- WARN_ON(1);
- return -EIO;
+ int ret;
+ struct extent_buffer *super = root->fs_info->sb_buffer;
+ struct inode *btree_inode = root->fs_info->btree_inode;
+
+ set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, super);
+ ret = sync_page_range_nolock(btree_inode, btree_inode->i_mapping,
+ super->start, super->len);
+ return ret;
+}
+
+int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
+{
+ radix_tree_delete(&fs_info->fs_roots_radix,
+ (unsigned long)root->root_key.objectid);
+ btrfs_sysfs_del_root(root);
+ if (root->inode)
+ iput(root->inode);
+ if (root->node)
+ free_extent_buffer(root->node);
+ if (root->commit_root)
+ free_extent_buffer(root->commit_root);
+ if (root->name)
+ kfree(root->name);
+ kfree(root);
+ return 0;
+}
+
+static 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++)
+ btrfs_free_fs_root(fs_info, gang[i]);
}
return 0;
}
{
int ret;
struct btrfs_trans_handle *trans;
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ fs_info->closing = 1;
+ btrfs_transaction_flush_work(root);
+ mutex_lock(&fs_info->fs_mutex);
+ btrfs_defrag_dirty_roots(root->fs_info);
trans = btrfs_start_transaction(root, 1);
- btrfs_commit_transaction(trans, root);
+ ret = btrfs_commit_transaction(trans, root);
/* run commit again to drop the original snapshot */
trans = btrfs_start_transaction(root, 1);
btrfs_commit_transaction(trans, root);
ret = btrfs_write_and_wait_transaction(NULL, root);
BUG_ON(ret);
write_ctree_super(NULL, root);
+ mutex_unlock(&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);
- kfree(root->fs_info);
- kfree(root);
+ if (fs_info->extent_root->node)
+ free_extent_buffer(fs_info->extent_root->node);
+
+ if (fs_info->tree_root->node)
+ free_extent_buffer(fs_info->tree_root->node);
+
+ free_extent_buffer(fs_info->sb_buffer);
+ truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
+ iput(fs_info->btree_inode);
+
+ btrfs_free_block_groups(root->fs_info);
+ del_fs_roots(fs_info);
+ kfree(fs_info->extent_root);
+ kfree(fs_info->tree_root);
return 0;
}
-void btrfs_block_release(struct btrfs_root *root, struct buffer_head *buf)
+int btrfs_buffer_uptodate(struct extent_buffer *buf)
{
- check_pattern(buf);
- brelse(buf);
+ struct inode *btree_inode = buf->first_page->mapping->host;
+ return extent_buffer_uptodate(&BTRFS_I(btree_inode)->extent_tree, buf);
}
+int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
+{
+ struct inode *btree_inode = buf->first_page->mapping->host;
+ return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->extent_tree,
+ buf);
+}
+
+void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
+{
+ struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
+ u64 transid = btrfs_header_generation(buf);
+ struct inode *btree_inode = root->fs_info->btree_inode;
+
+ if (transid != root->fs_info->generation) {
+ printk(KERN_CRIT "transid mismatch buffer %llu, found %Lu running %Lu\n",
+ (unsigned long long)extent_buffer_blocknr(buf),
+ transid, root->fs_info->generation);
+ WARN_ON(1);
+ }
+ set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, buf);
+}
+
+void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
+{
+ balance_dirty_pages_ratelimited_nr(
+ root->fs_info->btree_inode->i_mapping, nr);
+}
projects / mv-sheeva.git / blobdiff