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7a7bc21449
On 64 bits platforms we don't really need to have a dedicated member (the
objectid field) for the inode's number since we store in the VFS inode's
i_ino member, which is an unsigned long and this type is 64 bits wide on
64 bits platforms. We only need that field in case we are on a 32 bits
platform because the unsigned long type is 32 bits wide on such platforms
See commit 33345d0152
("Btrfs: Always use 64bit inode number") regarding
this 64/32 bits detail.
The objectid field of struct btrfs_inode is also used to store the ID of
a root for directories that are stubs for unreferenced roots. In such
cases the inode is a directory and has the BTRFS_INODE_ROOT_STUB runtime
flag set.
So in order to reduce the size of btrfs_inode structure on 64 bits
platforms we can remove the objectid member and use the VFS inode's i_ino
member instead whenever we need to get the inode number. In case the inode
is a root stub (BTRFS_INODE_ROOT_STUB set) we can use the member
last_reflink_trans to store the ID of the unreferenced root, since such
inode is a directory and reflinks can't be done against directories.
So remove the objectid fields for 64 bits platforms and alias the
last_reflink_trans field with a name of ref_root_id in a union.
On a release kernel config, this reduces the size of struct btrfs_inode
from 1040 bytes down to 1032 bytes.
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
301 lines
7.1 KiB
C
301 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2013 Fusion IO. All rights reserved.
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*/
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#include <linux/fs.h>
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#include <linux/mount.h>
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#include <linux/pseudo_fs.h>
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#include <linux/magic.h>
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#include "btrfs-tests.h"
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#include "../ctree.h"
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#include "../free-space-cache.h"
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#include "../free-space-tree.h"
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#include "../transaction.h"
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#include "../volumes.h"
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#include "../disk-io.h"
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#include "../qgroup.h"
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#include "../block-group.h"
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#include "../fs.h"
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static struct vfsmount *test_mnt = NULL;
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const char *test_error[] = {
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[TEST_ALLOC_FS_INFO] = "cannot allocate fs_info",
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[TEST_ALLOC_ROOT] = "cannot allocate root",
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[TEST_ALLOC_EXTENT_BUFFER] = "cannot extent buffer",
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[TEST_ALLOC_PATH] = "cannot allocate path",
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[TEST_ALLOC_INODE] = "cannot allocate inode",
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[TEST_ALLOC_BLOCK_GROUP] = "cannot allocate block group",
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[TEST_ALLOC_EXTENT_MAP] = "cannot allocate extent map",
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[TEST_ALLOC_CHUNK_MAP] = "cannot allocate chunk map",
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};
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static const struct super_operations btrfs_test_super_ops = {
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.alloc_inode = btrfs_alloc_inode,
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.destroy_inode = btrfs_test_destroy_inode,
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};
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static int btrfs_test_init_fs_context(struct fs_context *fc)
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{
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struct pseudo_fs_context *ctx = init_pseudo(fc, BTRFS_TEST_MAGIC);
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if (!ctx)
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return -ENOMEM;
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ctx->ops = &btrfs_test_super_ops;
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return 0;
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}
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static struct file_system_type test_type = {
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.name = "btrfs_test_fs",
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.init_fs_context = btrfs_test_init_fs_context,
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.kill_sb = kill_anon_super,
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};
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struct inode *btrfs_new_test_inode(void)
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{
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struct inode *inode;
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inode = new_inode(test_mnt->mnt_sb);
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if (!inode)
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return NULL;
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inode->i_mode = S_IFREG;
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btrfs_set_inode_number(BTRFS_I(inode), BTRFS_FIRST_FREE_OBJECTID);
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inode_init_owner(&nop_mnt_idmap, inode, NULL, S_IFREG);
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return inode;
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}
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static int btrfs_init_test_fs(void)
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{
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int ret;
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ret = register_filesystem(&test_type);
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if (ret) {
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printk(KERN_ERR "btrfs: cannot register test file system\n");
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return ret;
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}
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test_mnt = kern_mount(&test_type);
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if (IS_ERR(test_mnt)) {
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printk(KERN_ERR "btrfs: cannot mount test file system\n");
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unregister_filesystem(&test_type);
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return PTR_ERR(test_mnt);
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}
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return 0;
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}
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static void btrfs_destroy_test_fs(void)
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{
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kern_unmount(test_mnt);
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unregister_filesystem(&test_type);
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}
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struct btrfs_device *btrfs_alloc_dummy_device(struct btrfs_fs_info *fs_info)
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{
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struct btrfs_device *dev;
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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return ERR_PTR(-ENOMEM);
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extent_io_tree_init(fs_info, &dev->alloc_state, 0);
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INIT_LIST_HEAD(&dev->dev_list);
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list_add(&dev->dev_list, &fs_info->fs_devices->devices);
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return dev;
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}
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static void btrfs_free_dummy_device(struct btrfs_device *dev)
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{
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extent_io_tree_release(&dev->alloc_state);
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kfree(dev);
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}
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struct btrfs_fs_info *btrfs_alloc_dummy_fs_info(u32 nodesize, u32 sectorsize)
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{
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struct btrfs_fs_info *fs_info = kzalloc(sizeof(struct btrfs_fs_info),
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GFP_KERNEL);
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if (!fs_info)
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return fs_info;
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fs_info->fs_devices = kzalloc(sizeof(struct btrfs_fs_devices),
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GFP_KERNEL);
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if (!fs_info->fs_devices) {
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kfree(fs_info);
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return NULL;
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}
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INIT_LIST_HEAD(&fs_info->fs_devices->devices);
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fs_info->super_copy = kzalloc(sizeof(struct btrfs_super_block),
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GFP_KERNEL);
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if (!fs_info->super_copy) {
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kfree(fs_info->fs_devices);
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kfree(fs_info);
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return NULL;
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}
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btrfs_init_fs_info(fs_info);
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fs_info->nodesize = nodesize;
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fs_info->sectorsize = sectorsize;
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fs_info->sectorsize_bits = ilog2(sectorsize);
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set_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
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test_mnt->mnt_sb->s_fs_info = fs_info;
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return fs_info;
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}
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void btrfs_free_dummy_fs_info(struct btrfs_fs_info *fs_info)
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{
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struct radix_tree_iter iter;
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void **slot;
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struct btrfs_device *dev, *tmp;
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if (!fs_info)
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return;
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if (WARN_ON(!btrfs_is_testing(fs_info)))
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return;
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test_mnt->mnt_sb->s_fs_info = NULL;
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spin_lock(&fs_info->buffer_lock);
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radix_tree_for_each_slot(slot, &fs_info->buffer_radix, &iter, 0) {
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struct extent_buffer *eb;
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eb = radix_tree_deref_slot_protected(slot, &fs_info->buffer_lock);
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if (!eb)
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continue;
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/* Shouldn't happen but that kind of thinking creates CVE's */
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if (radix_tree_exception(eb)) {
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if (radix_tree_deref_retry(eb))
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slot = radix_tree_iter_retry(&iter);
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continue;
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}
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slot = radix_tree_iter_resume(slot, &iter);
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spin_unlock(&fs_info->buffer_lock);
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free_extent_buffer_stale(eb);
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spin_lock(&fs_info->buffer_lock);
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}
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spin_unlock(&fs_info->buffer_lock);
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btrfs_mapping_tree_free(fs_info);
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list_for_each_entry_safe(dev, tmp, &fs_info->fs_devices->devices,
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dev_list) {
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btrfs_free_dummy_device(dev);
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}
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btrfs_free_qgroup_config(fs_info);
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btrfs_free_fs_roots(fs_info);
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kfree(fs_info->super_copy);
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btrfs_check_leaked_roots(fs_info);
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btrfs_extent_buffer_leak_debug_check(fs_info);
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kfree(fs_info->fs_devices);
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kfree(fs_info);
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}
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void btrfs_free_dummy_root(struct btrfs_root *root)
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{
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if (IS_ERR_OR_NULL(root))
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return;
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/* Will be freed by btrfs_free_fs_roots */
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if (WARN_ON(test_bit(BTRFS_ROOT_IN_RADIX, &root->state)))
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return;
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btrfs_global_root_delete(root);
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btrfs_put_root(root);
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}
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struct btrfs_block_group *
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btrfs_alloc_dummy_block_group(struct btrfs_fs_info *fs_info,
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unsigned long length)
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{
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struct btrfs_block_group *cache;
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cache = kzalloc(sizeof(*cache), GFP_KERNEL);
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if (!cache)
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return NULL;
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cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl),
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GFP_KERNEL);
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if (!cache->free_space_ctl) {
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kfree(cache);
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return NULL;
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}
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cache->start = 0;
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cache->length = length;
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cache->full_stripe_len = fs_info->sectorsize;
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cache->fs_info = fs_info;
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INIT_LIST_HEAD(&cache->list);
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INIT_LIST_HEAD(&cache->cluster_list);
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INIT_LIST_HEAD(&cache->bg_list);
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btrfs_init_free_space_ctl(cache, cache->free_space_ctl);
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mutex_init(&cache->free_space_lock);
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return cache;
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}
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void btrfs_free_dummy_block_group(struct btrfs_block_group *cache)
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{
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if (!cache)
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return;
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btrfs_remove_free_space_cache(cache);
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kfree(cache->free_space_ctl);
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kfree(cache);
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}
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void btrfs_init_dummy_trans(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info)
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{
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memset(trans, 0, sizeof(*trans));
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trans->transid = 1;
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trans->type = __TRANS_DUMMY;
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trans->fs_info = fs_info;
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}
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int btrfs_run_sanity_tests(void)
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{
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int ret, i;
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u32 sectorsize, nodesize;
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u32 test_sectorsize[] = {
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PAGE_SIZE,
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};
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ret = btrfs_init_test_fs();
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if (ret)
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return ret;
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for (i = 0; i < ARRAY_SIZE(test_sectorsize); i++) {
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sectorsize = test_sectorsize[i];
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for (nodesize = sectorsize;
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nodesize <= BTRFS_MAX_METADATA_BLOCKSIZE;
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nodesize <<= 1) {
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pr_info("BTRFS: selftest: sectorsize: %u nodesize: %u\n",
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sectorsize, nodesize);
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ret = btrfs_test_free_space_cache(sectorsize, nodesize);
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if (ret)
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goto out;
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ret = btrfs_test_extent_buffer_operations(sectorsize,
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nodesize);
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if (ret)
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goto out;
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ret = btrfs_test_extent_io(sectorsize, nodesize);
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if (ret)
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goto out;
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ret = btrfs_test_inodes(sectorsize, nodesize);
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if (ret)
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goto out;
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ret = btrfs_test_qgroups(sectorsize, nodesize);
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if (ret)
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goto out;
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ret = btrfs_test_free_space_tree(sectorsize, nodesize);
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if (ret)
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goto out;
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}
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}
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ret = btrfs_test_extent_map();
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out:
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btrfs_destroy_test_fs();
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return ret;
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}
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