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- /*
- * 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/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"
- #include "print-tree.h"
- #if 0
- static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
- {
- 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 struct extent_map_ops btree_extent_map_ops;
- struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
- u64 bytenr, u32 blocksize)
- {
- struct inode *btree_inode = root->fs_info->btree_inode;
- struct extent_buffer *eb;
- eb = find_extent_buffer(&BTRFS_I(btree_inode)->extent_tree,
- bytenr, blocksize, GFP_NOFS);
- return eb;
- }
- struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
- u64 bytenr, u32 blocksize)
- {
- struct inode *btree_inode = root->fs_info->btree_inode;
- struct extent_buffer *eb;
- eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->extent_tree,
- bytenr, blocksize, NULL, GFP_NOFS);
- return eb;
- }
- struct extent_map *btree_get_extent(struct inode *inode, struct page *page,
- size_t page_offset, u64 start, u64 end,
- int create)
- {
- struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
- struct extent_map *em;
- int ret;
- again:
- em = lookup_extent_mapping(em_tree, start, end);
- if (em) {
- goto out;
- }
- 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;
- }
- u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
- {
- return crc32c(seed, data, len);
- }
- void btrfs_csum_final(u32 crc, char *result)
- {
- *(__le32 *)result = ~cpu_to_le32(crc);
- }
- static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
- int verify)
- {
- char result[BTRFS_CRC32_SIZE];
- unsigned long len;
- unsigned long cur_len;
- unsigned long offset = BTRFS_CSUM_SIZE;
- char *map_token = NULL;
- char *kaddr;
- unsigned long map_start;
- unsigned long map_len;
- int err;
- u32 crc = ~(u32)0;
- len = buf->len - offset;
- while(len > 0) {
- err = map_private_extent_buffer(buf, offset, 32,
- &map_token, &kaddr,
- &map_start, &map_len, KM_USER0);
- if (err) {
- printk("failed to map extent buffer! %lu\n",
- offset);
- return 1;
- }
- cur_len = min(len, map_len - (offset - map_start));
- crc = btrfs_csum_data(root, kaddr + offset - map_start,
- crc, cur_len);
- len -= cur_len;
- offset += cur_len;
- unmap_extent_buffer(buf, map_token, KM_USER0);
- }
- btrfs_csum_final(crc, result);
- if (verify) {
- int from_this_trans = 0;
- if (root->fs_info->running_transaction &&
- btrfs_header_generation(buf) ==
- root->fs_info->running_transaction->transid)
- from_this_trans = 1;
- /* FIXME, this is not good */
- if (from_this_trans == 0 &&
- memcmp_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE)) {
- u32 val;
- u32 found = 0;
- memcpy(&found, result, BTRFS_CRC32_SIZE);
- read_extent_buffer(buf, &val, 0, BTRFS_CRC32_SIZE);
- printk("btrfs: %s checksum verify failed on %llu "
- "wanted %X found %X from_this_trans %d\n",
- root->fs_info->sb->s_id,
- buf->start, val, found, from_this_trans);
- return 1;
- }
- } else {
- write_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE);
- }
- return 0;
- }
- int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
- {
- struct extent_map_tree *tree;
- u64 start = (u64)page->index << PAGE_CACHE_SHIFT;
- u64 found_start;
- int found_level;
- unsigned long len;
- struct extent_buffer *eb;
- tree = &BTRFS_I(page->mapping->host)->extent_tree;
- if (page->private == EXTENT_PAGE_PRIVATE)
- goto out;
- if (!page->private)
- goto out;
- len = page->private >> 2;
- if (len == 0) {
- WARN_ON(1);
- }
- eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
- read_extent_buffer_pages(tree, eb, start + PAGE_CACHE_SIZE, 1);
- found_start = btrfs_header_bytenr(eb);
- if (found_start != start) {
- printk("warning: eb start incorrect %Lu buffer %Lu len %lu\n",
- start, found_start, len);
- WARN_ON(1);
- goto err;
- }
- if (eb->first_page != page) {
- printk("bad first page %lu %lu\n", eb->first_page->index,
- page->index);
- WARN_ON(1);
- goto err;
- }
- if (!PageUptodate(page)) {
- printk("csum not up to date page %lu\n", page->index);
- WARN_ON(1);
- goto err;
- }
- found_level = btrfs_header_level(eb);
- csum_tree_block(root, eb, 0);
- err:
- free_extent_buffer(eb);
- out:
- return 0;
- }
- static int btree_writepage_io_hook(struct page *page, u64 start, u64 end)
- {
- struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
- csum_dirty_buffer(root, page);
- return 0;
- }
- static int btree_writepage(struct page *page, struct writeback_control *wbc)
- {
- struct extent_map_tree *tree;
- tree = &BTRFS_I(page->mapping->host)->extent_tree;
- return extent_write_full_page(tree, page, btree_get_extent, wbc);
- }
- static int btree_writepages(struct address_space *mapping,
- struct writeback_control *wbc)
- {
- struct extent_map_tree *tree;
- tree = &BTRFS_I(mapping->host)->extent_tree;
- if (wbc->sync_mode == WB_SYNC_NONE) {
- u64 num_dirty;
- u64 start = 0;
- unsigned long thresh = 96 * 1024 * 1024;
- if (wbc->for_kupdate)
- return 0;
- if (current_is_pdflush()) {
- thresh = 96 * 1024 * 1024;
- } else {
- thresh = 8 * 1024 * 1024;
- }
- num_dirty = count_range_bits(tree, &start, (u64)-1,
- thresh, EXTENT_DIRTY);
- if (num_dirty < thresh) {
- return 0;
- }
- }
- return extent_writepages(tree, mapping, 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 int btree_releasepage(struct page *page, gfp_t unused_gfp_flags)
- {
- struct extent_map_tree *tree;
- int ret;
- 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 ret;
- }
- static void btree_invalidatepage(struct page *page, unsigned long offset)
- {
- struct extent_map_tree *tree;
- tree = &BTRFS_I(page->mapping->host)->extent_tree;
- extent_invalidatepage(tree, page, offset);
- btree_releasepage(page, GFP_NOFS);
- }
- #if 0
- static int btree_writepage(struct page *page, struct writeback_control *wbc)
- {
- struct buffer_head *bh;
- 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,
- (1 << BH_Dirty)|(1 << BH_Uptodate));
- }
- head = page_buffers(page);
- bh = head;
- do {
- if (buffer_dirty(bh))
- csum_tree_block(root, bh, 0);
- bh = bh->b_this_page;
- } while (bh != head);
- return block_write_full_page(page, btree_get_block, wbc);
- }
- #endif
- static struct address_space_operations btree_aops = {
- .readpage = btree_readpage,
- .writepage = btree_writepage,
- .writepages = btree_writepages,
- .releasepage = btree_releasepage,
- .invalidatepage = btree_invalidatepage,
- .sync_page = block_sync_page,
- };
- int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize)
- {
- struct extent_buffer *buf = NULL;
- struct inode *btree_inode = root->fs_info->btree_inode;
- int ret = 0;
- buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
- if (!buf)
- return 0;
- read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
- buf, 0, 0);
- free_extent_buffer(buf);
- return ret;
- }
- struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
- u32 blocksize)
- {
- struct extent_buffer *buf = NULL;
- struct inode *btree_inode = root->fs_info->btree_inode;
- struct extent_map_tree *extent_tree;
- u64 end;
- int ret;
- extent_tree = &BTRFS_I(btree_inode)->extent_tree;
- buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
- if (!buf)
- return NULL;
- read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
- buf, 0, 1);
- if (buf->flags & EXTENT_CSUM)
- return buf;
- end = buf->start + PAGE_CACHE_SIZE - 1;
- if (test_range_bit(extent_tree, buf->start, end, EXTENT_CSUM, 1)) {
- buf->flags |= EXTENT_CSUM;
- return buf;
- }
- lock_extent(extent_tree, buf->start, end, GFP_NOFS);
- if (test_range_bit(extent_tree, buf->start, end, EXTENT_CSUM, 1)) {
- buf->flags |= EXTENT_CSUM;
- goto out_unlock;
- }
- ret = csum_tree_block(root, buf, 1);
- set_extent_bits(extent_tree, buf->start, end, EXTENT_CSUM, GFP_NOFS);
- buf->flags |= EXTENT_CSUM;
- out_unlock:
- unlock_extent(extent_tree, buf->start, end, GFP_NOFS);
- return buf;
- }
- int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
- struct extent_buffer *buf)
- {
- struct inode *btree_inode = root->fs_info->btree_inode;
- if (btrfs_header_generation(buf) ==
- root->fs_info->running_transaction->transid)
- 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;
- }
- static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
- u32 stripesize, struct btrfs_root *root,
- struct btrfs_fs_info *fs_info,
- u64 objectid)
- {
- root->node = NULL;
- root->inode = NULL;
- root->commit_root = NULL;
- root->sectorsize = sectorsize;
- root->nodesize = nodesize;
- root->leafsize = leafsize;
- root->stripesize = stripesize;
- 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;
- root->in_sysfs = 0;
- 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);
- root->defrag_running = 0;
- root->defrag_level = 0;
- root->root_key.objectid = objectid;
- return 0;
- }
- static int find_and_setup_root(struct btrfs_root *tree_root,
- struct btrfs_fs_info *fs_info,
- u64 objectid,
- struct btrfs_root *root)
- {
- int ret;
- u32 blocksize;
- __setup_root(tree_root->nodesize, tree_root->leafsize,
- tree_root->sectorsize, tree_root->stripesize,
- root, fs_info, objectid);
- ret = btrfs_find_last_root(tree_root, objectid,
- &root->root_item, &root->root_key);
- BUG_ON(ret);
- blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
- root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
- blocksize);
- BUG_ON(!root->node);
- return 0;
- }
- 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;
- u32 blocksize;
- 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(tree_root, fs_info,
- location->objectid, root);
- if (ret) {
- kfree(root);
- return ERR_PTR(ret);
- }
- goto insert;
- }
- __setup_root(tree_root->nodesize, tree_root->leafsize,
- tree_root->sectorsize, tree_root->stripesize,
- 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));
- 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);
- }
- blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
- root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
- blocksize);
- 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_lookup_fs_root(struct btrfs_fs_info *fs_info,
- u64 root_objectid)
- {
- struct btrfs_root *root;
- if (root_objectid == BTRFS_ROOT_TREE_OBJECTID)
- return fs_info->tree_root;
- if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID)
- return fs_info->extent_root;
- root = radix_tree_lookup(&fs_info->fs_roots_radix,
- (unsigned long)root_objectid);
- return root;
- }
- struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
- struct btrfs_key *location)
- {
- struct btrfs_root *root;
- int ret;
- if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
- return fs_info->tree_root;
- if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
- return fs_info->extent_root;
- 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_find_dead_roots(fs_info->tree_root,
- root->root_key.objectid, root);
- BUG_ON(ret);
- 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 = btrfs_read_fs_root_no_name(fs_info, location);
- if (!root)
- return NULL;
- if (root->in_sysfs)
- return root;
- 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);
- }
- root->in_sysfs = 1;
- return root;
- }
- #if 0
- static int add_hasher(struct btrfs_fs_info *info, char *type) {
- struct btrfs_hasher *hasher;
- hasher = kmalloc(sizeof(*hasher), GFP_NOFS);
- if (!hasher)
- return -ENOMEM;
- hasher->hash_tfm = crypto_alloc_hash(type, 0, CRYPTO_ALG_ASYNC);
- if (!hasher->hash_tfm) {
- kfree(hasher);
- return -EINVAL;
- }
- spin_lock(&info->hash_lock);
- list_add(&hasher->list, &info->hashers);
- spin_unlock(&info->hash_lock);
- return 0;
- }
- #endif
- struct btrfs_root *open_ctree(struct super_block *sb)
- {
- u32 sectorsize;
- u32 nodesize;
- u32 leafsize;
- u32 blocksize;
- u32 stripesize;
- 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_fs_info *fs_info = kmalloc(sizeof(*fs_info),
- GFP_NOFS);
- int ret;
- int err = -EIO;
- struct btrfs_super_block *disk_super;
- if (!extent_root || !tree_root || !fs_info) {
- err = -ENOMEM;
- goto fail;
- }
- INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS);
- INIT_LIST_HEAD(&fs_info->trans_list);
- INIT_LIST_HEAD(&fs_info->dead_roots);
- INIT_LIST_HEAD(&fs_info->hashers);
- spin_lock_init(&fs_info->hash_lock);
- spin_lock_init(&fs_info->delalloc_lock);
- spin_lock_init(&fs_info->new_trans_lock);
- 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->last_trans_committed = 0;
- fs_info->tree_root = tree_root;
- fs_info->extent_root = extent_root;
- fs_info->sb = sb;
- fs_info->throttles = 0;
- fs_info->mount_opt = 0;
- fs_info->max_extent = (u64)-1;
- fs_info->delalloc_bytes = 0;
- 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);
- BTRFS_I(fs_info->btree_inode)->extent_tree.ops = &btree_extent_map_ops;
- extent_map_tree_init(&fs_info->free_space_cache,
- fs_info->btree_inode->i_mapping, GFP_NOFS);
- extent_map_tree_init(&fs_info->block_group_cache,
- fs_info->btree_inode->i_mapping, GFP_NOFS);
- extent_map_tree_init(&fs_info->pinned_extents,
- fs_info->btree_inode->i_mapping, GFP_NOFS);
- extent_map_tree_init(&fs_info->pending_del,
- fs_info->btree_inode->i_mapping, GFP_NOFS);
- extent_map_tree_init(&fs_info->extent_ins,
- fs_info->btree_inode->i_mapping, GFP_NOFS);
- fs_info->do_barriers = 1;
- fs_info->closing = 0;
- fs_info->total_pinned = 0;
- #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
- INIT_WORK(&fs_info->trans_work, btrfs_transaction_cleaner, fs_info);
- #else
- INIT_DELAYED_WORK(&fs_info->trans_work, btrfs_transaction_cleaner);
- #endif
- 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);
- mutex_init(&fs_info->trans_mutex);
- mutex_init(&fs_info->fs_mutex);
- #if 0
- ret = add_hasher(fs_info, "crc32c");
- if (ret) {
- printk("btrfs: failed hash setup, modprobe cryptomgr?\n");
- err = -ENOMEM;
- goto fail_iput;
- }
- #endif
- __setup_root(512, 512, 512, 512, tree_root,
- fs_info, BTRFS_ROOT_TREE_OBJECTID);
- fs_info->sb_buffer = read_tree_block(tree_root,
- BTRFS_SUPER_INFO_OFFSET,
- 512);
- 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;
- nodesize = btrfs_super_nodesize(disk_super);
- leafsize = btrfs_super_leafsize(disk_super);
- sectorsize = btrfs_super_sectorsize(disk_super);
- stripesize = btrfs_super_stripesize(disk_super);
- tree_root->nodesize = nodesize;
- tree_root->leafsize = leafsize;
- tree_root->sectorsize = sectorsize;
- tree_root->stripesize = stripesize;
- sb_set_blocksize(sb, sectorsize);
- i_size_write(fs_info->btree_inode,
- btrfs_super_total_bytes(disk_super));
- 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;
- }
- blocksize = btrfs_level_size(tree_root,
- btrfs_super_root_level(disk_super));
- tree_root->node = read_tree_block(tree_root,
- btrfs_super_root(disk_super),
- blocksize);
- if (!tree_root->node)
- goto fail_sb_buffer;
- mutex_lock(&fs_info->fs_mutex);
- ret = find_and_setup_root(tree_root, fs_info,
- BTRFS_EXTENT_TREE_OBJECTID, extent_root);
- if (ret) {
- mutex_unlock(&fs_info->fs_mutex);
- goto fail_tree_root;
- }
- btrfs_read_block_groups(extent_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)
- {
- int ret;
- struct extent_buffer *super = root->fs_info->sb_buffer;
- struct inode *btree_inode = root->fs_info->btree_inode;
- struct super_block *sb = root->fs_info->sb;
- if (!btrfs_test_opt(root, NOBARRIER))
- blkdev_issue_flush(sb->s_bdev, NULL);
- 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);
- if (!btrfs_test_opt(root, NOBARRIER))
- blkdev_issue_flush(sb->s_bdev, NULL);
- 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);
- if (root->in_sysfs)
- 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 close_ctree(struct btrfs_root *root)
- {
- 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);
- 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 (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);
- btrfs_free_block_groups(root->fs_info);
- del_fs_roots(fs_info);
- filemap_write_and_wait(fs_info->btree_inode->i_mapping);
- extent_map_tree_empty_lru(&fs_info->free_space_cache);
- extent_map_tree_empty_lru(&fs_info->block_group_cache);
- extent_map_tree_empty_lru(&fs_info->pinned_extents);
- extent_map_tree_empty_lru(&fs_info->pending_del);
- extent_map_tree_empty_lru(&fs_info->extent_ins);
- extent_map_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->extent_tree);
- truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
- iput(fs_info->btree_inode);
- #if 0
- while(!list_empty(&fs_info->hashers)) {
- struct btrfs_hasher *hasher;
- hasher = list_entry(fs_info->hashers.next, struct btrfs_hasher,
- hashers);
- list_del(&hasher->hashers);
- crypto_free_hash(&fs_info->hash_tfm);
- kfree(hasher);
- }
- #endif
- kfree(fs_info->extent_root);
- kfree(fs_info->tree_root);
- return 0;
- }
- int btrfs_buffer_uptodate(struct extent_buffer *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)buf->start,
- transid, root->fs_info->generation);
- WARN_ON(1);
- }
- set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, buf);
- }
- void btrfs_throttle(struct btrfs_root *root)
- {
- struct backing_dev_info *bdi;
- bdi = root->fs_info->sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
- if (root->fs_info->throttles && bdi_write_congested(bdi))
- congestion_wait(WRITE, HZ/20);
- }
- void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
- {
- balance_dirty_pages_ratelimited_nr(
- root->fs_info->btree_inode->i_mapping, 1);
- }
- void btrfs_set_buffer_defrag(struct extent_buffer *buf)
- {
- struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
- struct inode *btree_inode = root->fs_info->btree_inode;
- set_extent_bits(&BTRFS_I(btree_inode)->extent_tree, buf->start,
- buf->start + buf->len - 1, EXTENT_DEFRAG, GFP_NOFS);
- }
- void btrfs_set_buffer_defrag_done(struct extent_buffer *buf)
- {
- struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
- struct inode *btree_inode = root->fs_info->btree_inode;
- set_extent_bits(&BTRFS_I(btree_inode)->extent_tree, buf->start,
- buf->start + buf->len - 1, EXTENT_DEFRAG_DONE,
- GFP_NOFS);
- }
- int btrfs_buffer_defrag(struct extent_buffer *buf)
- {
- struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
- struct inode *btree_inode = root->fs_info->btree_inode;
- return test_range_bit(&BTRFS_I(btree_inode)->extent_tree,
- buf->start, buf->start + buf->len - 1, EXTENT_DEFRAG, 0);
- }
- int btrfs_buffer_defrag_done(struct extent_buffer *buf)
- {
- struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
- struct inode *btree_inode = root->fs_info->btree_inode;
- return test_range_bit(&BTRFS_I(btree_inode)->extent_tree,
- buf->start, buf->start + buf->len - 1,
- EXTENT_DEFRAG_DONE, 0);
- }
- int btrfs_clear_buffer_defrag_done(struct extent_buffer *buf)
- {
- struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
- struct inode *btree_inode = root->fs_info->btree_inode;
- return clear_extent_bits(&BTRFS_I(btree_inode)->extent_tree,
- buf->start, buf->start + buf->len - 1,
- EXTENT_DEFRAG_DONE, GFP_NOFS);
- }
- int btrfs_clear_buffer_defrag(struct extent_buffer *buf)
- {
- struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
- struct inode *btree_inode = root->fs_info->btree_inode;
- return clear_extent_bits(&BTRFS_I(btree_inode)->extent_tree,
- buf->start, buf->start + buf->len - 1,
- EXTENT_DEFRAG, GFP_NOFS);
- }
- int btrfs_read_buffer(struct extent_buffer *buf)
- {
- struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
- struct inode *btree_inode = root->fs_info->btree_inode;
- return read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
- buf, 0, 1);
- }
- static struct extent_map_ops btree_extent_map_ops = {
- .writepage_io_hook = btree_writepage_io_hook,
- };
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