2008-03-25 03:01:56 +08:00
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/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/sched.h>
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#include <linux/bio.h>
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2008-03-25 03:02:07 +08:00
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#include <linux/buffer_head.h>
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2008-03-26 04:50:33 +08:00
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#include <asm/div64.h>
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2008-03-25 03:01:56 +08:00
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#include "ctree.h"
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#include "extent_map.h"
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#include "disk-io.h"
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#include "transaction.h"
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#include "print-tree.h"
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#include "volumes.h"
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2008-03-26 04:50:33 +08:00
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struct stripe {
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2008-03-25 03:01:56 +08:00
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struct btrfs_device *dev;
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u64 physical;
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};
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2008-03-26 04:50:33 +08:00
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struct map_lookup {
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u64 type;
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int io_align;
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int io_width;
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int stripe_len;
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int sector_size;
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int num_stripes;
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struct stripe stripes[];
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};
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#define map_lookup_size(n) (sizeof(struct map_lookup) + \
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(sizeof(struct stripe) * (n)))
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2008-03-25 03:02:07 +08:00
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static DEFINE_MUTEX(uuid_mutex);
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static LIST_HEAD(fs_uuids);
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int btrfs_cleanup_fs_uuids(void)
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{
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struct btrfs_fs_devices *fs_devices;
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struct list_head *uuid_cur;
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struct list_head *devices_cur;
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struct btrfs_device *dev;
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list_for_each(uuid_cur, &fs_uuids) {
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fs_devices = list_entry(uuid_cur, struct btrfs_fs_devices,
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list);
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while(!list_empty(&fs_devices->devices)) {
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devices_cur = fs_devices->devices.next;
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dev = list_entry(devices_cur, struct btrfs_device,
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dev_list);
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printk("uuid cleanup finds %s\n", dev->name);
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if (dev->bdev) {
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printk("closing\n");
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close_bdev_excl(dev->bdev);
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}
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list_del(&dev->dev_list);
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kfree(dev);
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}
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}
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return 0;
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}
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static struct btrfs_device *__find_device(struct list_head *head, u64 devid)
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{
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struct btrfs_device *dev;
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struct list_head *cur;
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list_for_each(cur, head) {
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dev = list_entry(cur, struct btrfs_device, dev_list);
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if (dev->devid == devid)
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return dev;
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}
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return NULL;
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}
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static struct btrfs_fs_devices *find_fsid(u8 *fsid)
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{
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struct list_head *cur;
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struct btrfs_fs_devices *fs_devices;
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list_for_each(cur, &fs_uuids) {
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fs_devices = list_entry(cur, struct btrfs_fs_devices, list);
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if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0)
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return fs_devices;
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}
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return NULL;
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}
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static int device_list_add(const char *path,
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struct btrfs_super_block *disk_super,
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u64 devid, struct btrfs_fs_devices **fs_devices_ret)
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{
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struct btrfs_device *device;
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struct btrfs_fs_devices *fs_devices;
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u64 found_transid = btrfs_super_generation(disk_super);
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fs_devices = find_fsid(disk_super->fsid);
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if (!fs_devices) {
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fs_devices = kmalloc(sizeof(*fs_devices), GFP_NOFS);
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if (!fs_devices)
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return -ENOMEM;
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INIT_LIST_HEAD(&fs_devices->devices);
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list_add(&fs_devices->list, &fs_uuids);
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memcpy(fs_devices->fsid, disk_super->fsid, BTRFS_FSID_SIZE);
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fs_devices->latest_devid = devid;
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fs_devices->latest_trans = found_transid;
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fs_devices->lowest_devid = (u64)-1;
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fs_devices->num_devices = 0;
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device = NULL;
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} else {
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device = __find_device(&fs_devices->devices, devid);
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}
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if (!device) {
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device = kzalloc(sizeof(*device), GFP_NOFS);
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if (!device) {
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/* we can safely leave the fs_devices entry around */
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return -ENOMEM;
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}
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device->devid = devid;
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device->name = kstrdup(path, GFP_NOFS);
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if (!device->name) {
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kfree(device);
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return -ENOMEM;
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}
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list_add(&device->dev_list, &fs_devices->devices);
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fs_devices->num_devices++;
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}
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if (found_transid > fs_devices->latest_trans) {
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fs_devices->latest_devid = devid;
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fs_devices->latest_trans = found_transid;
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}
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if (fs_devices->lowest_devid > devid) {
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fs_devices->lowest_devid = devid;
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printk("lowest devid now %Lu\n", devid);
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}
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*fs_devices_ret = fs_devices;
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return 0;
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}
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int btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
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{
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struct list_head *head = &fs_devices->devices;
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struct list_head *cur;
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struct btrfs_device *device;
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mutex_lock(&uuid_mutex);
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list_for_each(cur, head) {
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device = list_entry(cur, struct btrfs_device, dev_list);
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if (device->bdev) {
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close_bdev_excl(device->bdev);
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printk("close devices closes %s\n", device->name);
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}
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device->bdev = NULL;
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}
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mutex_unlock(&uuid_mutex);
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return 0;
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}
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int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
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int flags, void *holder)
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{
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struct block_device *bdev;
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struct list_head *head = &fs_devices->devices;
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struct list_head *cur;
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struct btrfs_device *device;
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int ret;
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mutex_lock(&uuid_mutex);
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list_for_each(cur, head) {
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device = list_entry(cur, struct btrfs_device, dev_list);
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bdev = open_bdev_excl(device->name, flags, holder);
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printk("opening %s devid %Lu\n", device->name, device->devid);
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if (IS_ERR(bdev)) {
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printk("open %s failed\n", device->name);
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ret = PTR_ERR(bdev);
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goto fail;
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}
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if (device->devid == fs_devices->latest_devid)
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fs_devices->latest_bdev = bdev;
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if (device->devid == fs_devices->lowest_devid) {
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fs_devices->lowest_bdev = bdev;
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printk("lowest bdev %s\n", device->name);
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}
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device->bdev = bdev;
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}
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mutex_unlock(&uuid_mutex);
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return 0;
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fail:
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mutex_unlock(&uuid_mutex);
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btrfs_close_devices(fs_devices);
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return ret;
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}
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int btrfs_scan_one_device(const char *path, int flags, void *holder,
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struct btrfs_fs_devices **fs_devices_ret)
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{
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struct btrfs_super_block *disk_super;
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struct block_device *bdev;
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struct buffer_head *bh;
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int ret;
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u64 devid;
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mutex_lock(&uuid_mutex);
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printk("scan one opens %s\n", path);
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bdev = open_bdev_excl(path, flags, holder);
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if (IS_ERR(bdev)) {
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printk("open failed\n");
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ret = PTR_ERR(bdev);
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goto error;
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}
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ret = set_blocksize(bdev, 4096);
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if (ret)
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goto error_close;
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bh = __bread(bdev, BTRFS_SUPER_INFO_OFFSET / 4096, 4096);
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if (!bh) {
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ret = -EIO;
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goto error_close;
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}
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disk_super = (struct btrfs_super_block *)bh->b_data;
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if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
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sizeof(disk_super->magic))) {
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printk("no btrfs found on %s\n", path);
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2008-04-01 23:21:34 +08:00
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ret = -EINVAL;
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2008-03-25 03:02:07 +08:00
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goto error_brelse;
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}
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devid = le64_to_cpu(disk_super->dev_item.devid);
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printk("found device %Lu on %s\n", devid, path);
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ret = device_list_add(path, disk_super, devid, fs_devices_ret);
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error_brelse:
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brelse(bh);
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error_close:
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close_bdev_excl(bdev);
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printk("scan one closes bdev %s\n", path);
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error:
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mutex_unlock(&uuid_mutex);
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return ret;
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}
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2008-03-25 03:01:56 +08:00
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/*
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* this uses a pretty simple search, the expectation is that it is
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* called very infrequently and that a given device has a small number
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* of extents
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*/
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static int find_free_dev_extent(struct btrfs_trans_handle *trans,
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struct btrfs_device *device,
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struct btrfs_path *path,
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u64 num_bytes, u64 *start)
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{
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struct btrfs_key key;
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struct btrfs_root *root = device->dev_root;
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struct btrfs_dev_extent *dev_extent = NULL;
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u64 hole_size = 0;
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u64 last_byte = 0;
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u64 search_start = 0;
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u64 search_end = device->total_bytes;
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int ret;
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int slot = 0;
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int start_found;
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struct extent_buffer *l;
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start_found = 0;
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path->reada = 2;
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/* FIXME use last free of some kind */
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2008-03-25 03:02:07 +08:00
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/* we don't want to overwrite the superblock on the drive,
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* so we make sure to start at an offset of at least 1MB
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*/
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search_start = max((u64)1024 * 1024, search_start);
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2008-03-25 03:01:56 +08:00
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key.objectid = device->devid;
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key.offset = search_start;
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key.type = BTRFS_DEV_EXTENT_KEY;
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ret = btrfs_search_slot(trans, root, &key, path, 0, 0);
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if (ret < 0)
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goto error;
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ret = btrfs_previous_item(root, path, 0, key.type);
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if (ret < 0)
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goto error;
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l = path->nodes[0];
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btrfs_item_key_to_cpu(l, &key, path->slots[0]);
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while (1) {
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l = path->nodes[0];
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slot = path->slots[0];
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if (slot >= btrfs_header_nritems(l)) {
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ret = btrfs_next_leaf(root, path);
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if (ret == 0)
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continue;
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if (ret < 0)
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goto error;
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no_more_items:
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if (!start_found) {
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if (search_start >= search_end) {
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ret = -ENOSPC;
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goto error;
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}
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*start = search_start;
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start_found = 1;
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goto check_pending;
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}
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*start = last_byte > search_start ?
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last_byte : search_start;
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if (search_end <= *start) {
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ret = -ENOSPC;
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goto error;
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}
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goto check_pending;
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}
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btrfs_item_key_to_cpu(l, &key, slot);
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if (key.objectid < device->devid)
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goto next;
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if (key.objectid > device->devid)
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goto no_more_items;
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if (key.offset >= search_start && key.offset > last_byte &&
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start_found) {
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if (last_byte < search_start)
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last_byte = search_start;
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hole_size = key.offset - last_byte;
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if (key.offset > last_byte &&
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hole_size >= num_bytes) {
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*start = last_byte;
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goto check_pending;
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}
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}
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if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY) {
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goto next;
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}
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|
start_found = 1;
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|
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dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent);
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|
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last_byte = key.offset + btrfs_dev_extent_length(l, dev_extent);
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|
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next:
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path->slots[0]++;
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|
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cond_resched();
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|
}
|
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|
|
check_pending:
|
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|
|
/* we have to make sure we didn't find an extent that has already
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|
|
|
* been allocated by the map tree or the original allocation
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|
|
|
*/
|
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|
|
btrfs_release_path(root, path);
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|
|
BUG_ON(*start < search_start);
|
|
|
|
|
2008-03-25 03:01:59 +08:00
|
|
|
if (*start + num_bytes > search_end) {
|
2008-03-25 03:01:56 +08:00
|
|
|
ret = -ENOSPC;
|
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
/* check for pending inserts here */
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
error:
|
|
|
|
btrfs_release_path(root, path);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
|
|
|
|
struct btrfs_device *device,
|
|
|
|
u64 owner, u64 num_bytes, u64 *start)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
struct btrfs_path *path;
|
|
|
|
struct btrfs_root *root = device->dev_root;
|
|
|
|
struct btrfs_dev_extent *extent;
|
|
|
|
struct extent_buffer *leaf;
|
|
|
|
struct btrfs_key key;
|
|
|
|
|
|
|
|
path = btrfs_alloc_path();
|
|
|
|
if (!path)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
ret = find_free_dev_extent(trans, device, path, num_bytes, start);
|
2008-03-25 03:01:59 +08:00
|
|
|
if (ret) {
|
2008-03-25 03:01:56 +08:00
|
|
|
goto err;
|
2008-03-25 03:01:59 +08:00
|
|
|
}
|
2008-03-25 03:01:56 +08:00
|
|
|
|
|
|
|
key.objectid = device->devid;
|
|
|
|
key.offset = *start;
|
|
|
|
key.type = BTRFS_DEV_EXTENT_KEY;
|
|
|
|
ret = btrfs_insert_empty_item(trans, root, path, &key,
|
|
|
|
sizeof(*extent));
|
|
|
|
BUG_ON(ret);
|
|
|
|
|
|
|
|
leaf = path->nodes[0];
|
|
|
|
extent = btrfs_item_ptr(leaf, path->slots[0],
|
|
|
|
struct btrfs_dev_extent);
|
|
|
|
btrfs_set_dev_extent_owner(leaf, extent, owner);
|
|
|
|
btrfs_set_dev_extent_length(leaf, extent, num_bytes);
|
|
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
|
|
err:
|
|
|
|
btrfs_free_path(path);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int find_next_chunk(struct btrfs_root *root, u64 *objectid)
|
|
|
|
{
|
|
|
|
struct btrfs_path *path;
|
|
|
|
int ret;
|
|
|
|
struct btrfs_key key;
|
|
|
|
struct btrfs_key found_key;
|
|
|
|
|
|
|
|
path = btrfs_alloc_path();
|
|
|
|
BUG_ON(!path);
|
|
|
|
|
|
|
|
key.objectid = (u64)-1;
|
|
|
|
key.offset = (u64)-1;
|
|
|
|
key.type = BTRFS_CHUNK_ITEM_KEY;
|
|
|
|
|
|
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
|
|
if (ret < 0)
|
|
|
|
goto error;
|
|
|
|
|
|
|
|
BUG_ON(ret == 0);
|
|
|
|
|
|
|
|
ret = btrfs_previous_item(root, path, 0, BTRFS_CHUNK_ITEM_KEY);
|
|
|
|
if (ret) {
|
|
|
|
*objectid = 0;
|
|
|
|
} else {
|
|
|
|
btrfs_item_key_to_cpu(path->nodes[0], &found_key,
|
|
|
|
path->slots[0]);
|
|
|
|
*objectid = found_key.objectid + found_key.offset;
|
|
|
|
}
|
|
|
|
ret = 0;
|
|
|
|
error:
|
|
|
|
btrfs_free_path(path);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int find_next_devid(struct btrfs_root *root, struct btrfs_path *path,
|
|
|
|
u64 *objectid)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
struct btrfs_key key;
|
|
|
|
struct btrfs_key found_key;
|
|
|
|
|
|
|
|
key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
|
|
|
|
key.type = BTRFS_DEV_ITEM_KEY;
|
|
|
|
key.offset = (u64)-1;
|
|
|
|
|
|
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
|
|
if (ret < 0)
|
|
|
|
goto error;
|
|
|
|
|
|
|
|
BUG_ON(ret == 0);
|
|
|
|
|
|
|
|
ret = btrfs_previous_item(root, path, BTRFS_DEV_ITEMS_OBJECTID,
|
|
|
|
BTRFS_DEV_ITEM_KEY);
|
|
|
|
if (ret) {
|
|
|
|
*objectid = 1;
|
|
|
|
} else {
|
|
|
|
btrfs_item_key_to_cpu(path->nodes[0], &found_key,
|
|
|
|
path->slots[0]);
|
|
|
|
*objectid = found_key.offset + 1;
|
|
|
|
}
|
|
|
|
ret = 0;
|
|
|
|
error:
|
|
|
|
btrfs_release_path(root, path);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* the device information is stored in the chunk root
|
|
|
|
* the btrfs_device struct should be fully filled in
|
|
|
|
*/
|
|
|
|
int btrfs_add_device(struct btrfs_trans_handle *trans,
|
|
|
|
struct btrfs_root *root,
|
|
|
|
struct btrfs_device *device)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
struct btrfs_path *path;
|
|
|
|
struct btrfs_dev_item *dev_item;
|
|
|
|
struct extent_buffer *leaf;
|
|
|
|
struct btrfs_key key;
|
|
|
|
unsigned long ptr;
|
|
|
|
u64 free_devid;
|
|
|
|
|
|
|
|
root = root->fs_info->chunk_root;
|
|
|
|
|
|
|
|
path = btrfs_alloc_path();
|
|
|
|
if (!path)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
ret = find_next_devid(root, path, &free_devid);
|
|
|
|
if (ret)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
|
|
|
|
key.type = BTRFS_DEV_ITEM_KEY;
|
|
|
|
key.offset = free_devid;
|
|
|
|
|
|
|
|
ret = btrfs_insert_empty_item(trans, root, path, &key,
|
2008-03-25 03:02:07 +08:00
|
|
|
sizeof(*dev_item));
|
2008-03-25 03:01:56 +08:00
|
|
|
if (ret)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
leaf = path->nodes[0];
|
|
|
|
dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item);
|
|
|
|
|
2008-03-25 03:02:07 +08:00
|
|
|
device->devid = free_devid;
|
2008-03-25 03:01:56 +08:00
|
|
|
btrfs_set_device_id(leaf, dev_item, device->devid);
|
|
|
|
btrfs_set_device_type(leaf, dev_item, device->type);
|
|
|
|
btrfs_set_device_io_align(leaf, dev_item, device->io_align);
|
|
|
|
btrfs_set_device_io_width(leaf, dev_item, device->io_width);
|
|
|
|
btrfs_set_device_sector_size(leaf, dev_item, device->sector_size);
|
|
|
|
btrfs_set_device_total_bytes(leaf, dev_item, device->total_bytes);
|
|
|
|
btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used);
|
|
|
|
|
|
|
|
ptr = (unsigned long)btrfs_device_uuid(dev_item);
|
|
|
|
write_extent_buffer(leaf, device->uuid, ptr, BTRFS_DEV_UUID_SIZE);
|
|
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
|
|
ret = 0;
|
|
|
|
|
|
|
|
out:
|
|
|
|
btrfs_free_path(path);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
int btrfs_update_device(struct btrfs_trans_handle *trans,
|
|
|
|
struct btrfs_device *device)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
struct btrfs_path *path;
|
|
|
|
struct btrfs_root *root;
|
|
|
|
struct btrfs_dev_item *dev_item;
|
|
|
|
struct extent_buffer *leaf;
|
|
|
|
struct btrfs_key key;
|
|
|
|
|
|
|
|
root = device->dev_root->fs_info->chunk_root;
|
|
|
|
|
|
|
|
path = btrfs_alloc_path();
|
|
|
|
if (!path)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
|
|
|
|
key.type = BTRFS_DEV_ITEM_KEY;
|
|
|
|
key.offset = device->devid;
|
|
|
|
|
|
|
|
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
|
|
|
|
if (ret < 0)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
if (ret > 0) {
|
|
|
|
ret = -ENOENT;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
leaf = path->nodes[0];
|
|
|
|
dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item);
|
|
|
|
|
|
|
|
btrfs_set_device_id(leaf, dev_item, device->devid);
|
|
|
|
btrfs_set_device_type(leaf, dev_item, device->type);
|
|
|
|
btrfs_set_device_io_align(leaf, dev_item, device->io_align);
|
|
|
|
btrfs_set_device_io_width(leaf, dev_item, device->io_width);
|
|
|
|
btrfs_set_device_sector_size(leaf, dev_item, device->sector_size);
|
|
|
|
btrfs_set_device_total_bytes(leaf, dev_item, device->total_bytes);
|
|
|
|
btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used);
|
|
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
|
|
|
|
|
|
out:
|
|
|
|
btrfs_free_path(path);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
int btrfs_add_system_chunk(struct btrfs_trans_handle *trans,
|
|
|
|
struct btrfs_root *root,
|
|
|
|
struct btrfs_key *key,
|
|
|
|
struct btrfs_chunk *chunk, int item_size)
|
|
|
|
{
|
|
|
|
struct btrfs_super_block *super_copy = &root->fs_info->super_copy;
|
|
|
|
struct btrfs_disk_key disk_key;
|
|
|
|
u32 array_size;
|
|
|
|
u8 *ptr;
|
|
|
|
|
|
|
|
array_size = btrfs_super_sys_array_size(super_copy);
|
|
|
|
if (array_size + item_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE)
|
|
|
|
return -EFBIG;
|
|
|
|
|
|
|
|
ptr = super_copy->sys_chunk_array + array_size;
|
|
|
|
btrfs_cpu_key_to_disk(&disk_key, key);
|
|
|
|
memcpy(ptr, &disk_key, sizeof(disk_key));
|
|
|
|
ptr += sizeof(disk_key);
|
|
|
|
memcpy(ptr, chunk, item_size);
|
|
|
|
item_size += sizeof(disk_key);
|
|
|
|
btrfs_set_super_sys_array_size(super_copy, array_size + item_size);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
|
|
|
|
struct btrfs_root *extent_root, u64 *start,
|
2008-03-25 03:01:59 +08:00
|
|
|
u64 *num_bytes, u64 type)
|
2008-03-25 03:01:56 +08:00
|
|
|
{
|
|
|
|
u64 dev_offset;
|
2008-03-26 04:50:33 +08:00
|
|
|
struct btrfs_fs_info *info = extent_root->fs_info;
|
2008-03-25 03:01:56 +08:00
|
|
|
struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root;
|
|
|
|
struct btrfs_stripe *stripes;
|
|
|
|
struct btrfs_device *device = NULL;
|
|
|
|
struct btrfs_chunk *chunk;
|
2008-03-25 03:01:59 +08:00
|
|
|
struct list_head private_devs;
|
2008-03-25 03:02:07 +08:00
|
|
|
struct list_head *dev_list = &extent_root->fs_info->fs_devices->devices;
|
2008-03-25 03:01:59 +08:00
|
|
|
struct list_head *cur;
|
2008-03-25 03:01:56 +08:00
|
|
|
struct extent_map_tree *em_tree;
|
|
|
|
struct map_lookup *map;
|
|
|
|
struct extent_map *em;
|
|
|
|
u64 physical;
|
|
|
|
u64 calc_size = 1024 * 1024 * 1024;
|
2008-03-25 03:01:59 +08:00
|
|
|
u64 avail;
|
|
|
|
u64 max_avail = 0;
|
|
|
|
int num_stripes = 1;
|
|
|
|
int looped = 0;
|
2008-03-25 03:01:56 +08:00
|
|
|
int ret;
|
2008-03-25 03:01:59 +08:00
|
|
|
int index;
|
2008-03-26 04:50:33 +08:00
|
|
|
int stripe_len = 64 * 1024;
|
2008-03-25 03:01:56 +08:00
|
|
|
struct btrfs_key key;
|
|
|
|
|
2008-03-25 03:01:59 +08:00
|
|
|
if (list_empty(dev_list))
|
|
|
|
return -ENOSPC;
|
2008-03-26 04:50:33 +08:00
|
|
|
|
|
|
|
if (type & BTRFS_BLOCK_GROUP_RAID0)
|
|
|
|
num_stripes = btrfs_super_num_devices(&info->super_copy);
|
|
|
|
if (type & BTRFS_BLOCK_GROUP_DATA)
|
|
|
|
stripe_len = 64 * 1024;
|
|
|
|
if (type & (BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_SYSTEM))
|
|
|
|
stripe_len = 32 * 1024;
|
2008-03-25 03:01:59 +08:00
|
|
|
again:
|
|
|
|
INIT_LIST_HEAD(&private_devs);
|
|
|
|
cur = dev_list->next;
|
|
|
|
index = 0;
|
|
|
|
/* build a private list of devices we will allocate from */
|
|
|
|
while(index < num_stripes) {
|
|
|
|
device = list_entry(cur, struct btrfs_device, dev_list);
|
|
|
|
avail = device->total_bytes - device->bytes_used;
|
|
|
|
cur = cur->next;
|
|
|
|
if (avail > max_avail)
|
|
|
|
max_avail = avail;
|
|
|
|
if (avail >= calc_size) {
|
|
|
|
list_move_tail(&device->dev_list, &private_devs);
|
|
|
|
index++;
|
|
|
|
}
|
|
|
|
if (cur == dev_list)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (index < num_stripes) {
|
|
|
|
list_splice(&private_devs, dev_list);
|
|
|
|
if (!looped && max_avail > 0) {
|
|
|
|
looped = 1;
|
|
|
|
calc_size = max_avail;
|
|
|
|
goto again;
|
|
|
|
}
|
|
|
|
return -ENOSPC;
|
|
|
|
}
|
2008-03-25 03:01:56 +08:00
|
|
|
|
|
|
|
ret = find_next_chunk(chunk_root, &key.objectid);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
chunk = kmalloc(btrfs_chunk_item_size(num_stripes), GFP_NOFS);
|
|
|
|
if (!chunk)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2008-03-26 04:50:33 +08:00
|
|
|
map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS);
|
|
|
|
if (!map) {
|
|
|
|
kfree(chunk);
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
2008-03-25 03:01:56 +08:00
|
|
|
stripes = &chunk->stripe;
|
|
|
|
|
2008-03-26 04:50:33 +08:00
|
|
|
*num_bytes = calc_size * num_stripes;
|
2008-03-25 03:01:59 +08:00
|
|
|
index = 0;
|
2008-03-25 03:01:56 +08:00
|
|
|
while(index < num_stripes) {
|
2008-03-25 03:01:59 +08:00
|
|
|
BUG_ON(list_empty(&private_devs));
|
|
|
|
cur = private_devs.next;
|
|
|
|
device = list_entry(cur, struct btrfs_device, dev_list);
|
|
|
|
list_move_tail(&device->dev_list, dev_list);
|
2008-03-25 03:01:56 +08:00
|
|
|
|
|
|
|
ret = btrfs_alloc_dev_extent(trans, device,
|
|
|
|
key.objectid,
|
|
|
|
calc_size, &dev_offset);
|
|
|
|
BUG_ON(ret);
|
2008-03-25 03:02:07 +08:00
|
|
|
printk("alloc chunk size %Lu from dev %Lu\n", calc_size, device->devid);
|
2008-03-25 03:01:56 +08:00
|
|
|
device->bytes_used += calc_size;
|
|
|
|
ret = btrfs_update_device(trans, device);
|
|
|
|
BUG_ON(ret);
|
|
|
|
|
2008-03-26 04:50:33 +08:00
|
|
|
map->stripes[index].dev = device;
|
|
|
|
map->stripes[index].physical = dev_offset;
|
2008-03-25 03:01:56 +08:00
|
|
|
btrfs_set_stack_stripe_devid(stripes + index, device->devid);
|
|
|
|
btrfs_set_stack_stripe_offset(stripes + index, dev_offset);
|
|
|
|
physical = dev_offset;
|
|
|
|
index++;
|
|
|
|
}
|
2008-03-25 03:01:59 +08:00
|
|
|
BUG_ON(!list_empty(&private_devs));
|
2008-03-25 03:01:56 +08:00
|
|
|
|
|
|
|
/* key.objectid was set above */
|
|
|
|
key.offset = *num_bytes;
|
|
|
|
key.type = BTRFS_CHUNK_ITEM_KEY;
|
|
|
|
btrfs_set_stack_chunk_owner(chunk, extent_root->root_key.objectid);
|
2008-03-26 04:50:33 +08:00
|
|
|
btrfs_set_stack_chunk_stripe_len(chunk, stripe_len);
|
2008-03-25 03:01:56 +08:00
|
|
|
btrfs_set_stack_chunk_type(chunk, type);
|
|
|
|
btrfs_set_stack_chunk_num_stripes(chunk, num_stripes);
|
2008-03-26 04:50:33 +08:00
|
|
|
btrfs_set_stack_chunk_io_align(chunk, stripe_len);
|
|
|
|
btrfs_set_stack_chunk_io_width(chunk, stripe_len);
|
2008-03-25 03:01:56 +08:00
|
|
|
btrfs_set_stack_chunk_sector_size(chunk, extent_root->sectorsize);
|
2008-03-26 04:50:33 +08:00
|
|
|
map->sector_size = extent_root->sectorsize;
|
|
|
|
map->stripe_len = stripe_len;
|
|
|
|
map->io_align = stripe_len;
|
|
|
|
map->io_width = stripe_len;
|
|
|
|
map->type = type;
|
|
|
|
map->num_stripes = num_stripes;
|
2008-03-25 03:01:56 +08:00
|
|
|
|
|
|
|
ret = btrfs_insert_item(trans, chunk_root, &key, chunk,
|
|
|
|
btrfs_chunk_item_size(num_stripes));
|
|
|
|
BUG_ON(ret);
|
|
|
|
*start = key.objectid;
|
|
|
|
|
|
|
|
em = alloc_extent_map(GFP_NOFS);
|
|
|
|
if (!em)
|
|
|
|
return -ENOMEM;
|
|
|
|
em->bdev = (struct block_device *)map;
|
|
|
|
em->start = key.objectid;
|
|
|
|
em->len = key.offset;
|
|
|
|
em->block_start = 0;
|
|
|
|
|
|
|
|
kfree(chunk);
|
|
|
|
|
|
|
|
em_tree = &extent_root->fs_info->mapping_tree.map_tree;
|
|
|
|
spin_lock(&em_tree->lock);
|
|
|
|
ret = add_extent_mapping(em_tree, em);
|
|
|
|
BUG_ON(ret);
|
|
|
|
spin_unlock(&em_tree->lock);
|
|
|
|
free_extent_map(em);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
void btrfs_mapping_init(struct btrfs_mapping_tree *tree)
|
|
|
|
{
|
|
|
|
extent_map_tree_init(&tree->map_tree, GFP_NOFS);
|
|
|
|
}
|
|
|
|
|
|
|
|
void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree)
|
|
|
|
{
|
|
|
|
struct extent_map *em;
|
|
|
|
|
|
|
|
while(1) {
|
|
|
|
spin_lock(&tree->map_tree.lock);
|
|
|
|
em = lookup_extent_mapping(&tree->map_tree, 0, (u64)-1);
|
|
|
|
if (em)
|
|
|
|
remove_extent_mapping(&tree->map_tree, em);
|
|
|
|
spin_unlock(&tree->map_tree.lock);
|
|
|
|
if (!em)
|
|
|
|
break;
|
|
|
|
kfree(em->bdev);
|
|
|
|
/* once for us */
|
|
|
|
free_extent_map(em);
|
|
|
|
/* once for the tree */
|
|
|
|
free_extent_map(em);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
int btrfs_map_block(struct btrfs_mapping_tree *map_tree,
|
|
|
|
u64 logical, u64 *phys, u64 *length,
|
|
|
|
struct btrfs_device **dev)
|
|
|
|
{
|
|
|
|
struct extent_map *em;
|
|
|
|
struct map_lookup *map;
|
|
|
|
struct extent_map_tree *em_tree = &map_tree->map_tree;
|
|
|
|
u64 offset;
|
2008-03-26 04:50:33 +08:00
|
|
|
u64 stripe_offset;
|
|
|
|
u64 stripe_nr;
|
|
|
|
int stripe_index;
|
2008-03-25 03:01:56 +08:00
|
|
|
|
|
|
|
|
|
|
|
spin_lock(&em_tree->lock);
|
|
|
|
em = lookup_extent_mapping(em_tree, logical, *length);
|
|
|
|
BUG_ON(!em);
|
|
|
|
|
|
|
|
BUG_ON(em->start > logical || em->start + em->len < logical);
|
|
|
|
map = (struct map_lookup *)em->bdev;
|
|
|
|
offset = logical - em->start;
|
2008-03-26 04:50:33 +08:00
|
|
|
|
|
|
|
stripe_nr = offset;
|
|
|
|
/*
|
|
|
|
* stripe_nr counts the total number of stripes we have to stride
|
|
|
|
* to get to this block
|
|
|
|
*/
|
|
|
|
do_div(stripe_nr, map->stripe_len);
|
|
|
|
|
|
|
|
stripe_offset = stripe_nr * map->stripe_len;
|
|
|
|
BUG_ON(offset < stripe_offset);
|
|
|
|
|
|
|
|
/* stripe_offset is the offset of this block in its stripe*/
|
|
|
|
stripe_offset = offset - stripe_offset;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* after this do_div call, stripe_nr is the number of stripes
|
|
|
|
* on this device we have to walk to find the data, and
|
|
|
|
* stripe_index is the number of our device in the stripe array
|
|
|
|
*/
|
|
|
|
stripe_index = do_div(stripe_nr, map->num_stripes);
|
|
|
|
|
|
|
|
BUG_ON(stripe_index >= map->num_stripes);
|
|
|
|
|
|
|
|
*phys = map->stripes[stripe_index].physical + stripe_offset +
|
|
|
|
stripe_nr * map->stripe_len;
|
|
|
|
|
|
|
|
if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
|
|
|
|
/* we limit the length of each bio to what fits in a stripe */
|
|
|
|
*length = min_t(u64, em->len - offset,
|
|
|
|
map->stripe_len - stripe_offset);
|
|
|
|
} else {
|
|
|
|
*length = em->len - offset;
|
|
|
|
}
|
|
|
|
*dev = map->stripes[stripe_index].dev;
|
2008-03-25 03:01:56 +08:00
|
|
|
free_extent_map(em);
|
|
|
|
spin_unlock(&em_tree->lock);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio)
|
|
|
|
{
|
|
|
|
struct btrfs_mapping_tree *map_tree;
|
|
|
|
struct btrfs_device *dev;
|
|
|
|
u64 logical = bio->bi_sector << 9;
|
|
|
|
u64 physical;
|
|
|
|
u64 length = 0;
|
|
|
|
u64 map_length;
|
|
|
|
struct bio_vec *bvec;
|
|
|
|
int i;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
bio_for_each_segment(bvec, bio, i) {
|
|
|
|
length += bvec->bv_len;
|
|
|
|
}
|
|
|
|
map_tree = &root->fs_info->mapping_tree;
|
|
|
|
map_length = length;
|
|
|
|
ret = btrfs_map_block(map_tree, logical, &physical, &map_length, &dev);
|
2008-03-25 03:02:07 +08:00
|
|
|
if (map_length < length) {
|
|
|
|
printk("mapping failed logical %Lu bio len %Lu physical %Lu "
|
|
|
|
"len %Lu\n", logical, length, physical, map_length);
|
|
|
|
BUG();
|
|
|
|
}
|
2008-03-25 03:01:56 +08:00
|
|
|
BUG_ON(map_length < length);
|
|
|
|
bio->bi_sector = physical >> 9;
|
|
|
|
bio->bi_bdev = dev->bdev;
|
|
|
|
submit_bio(rw, bio);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid)
|
|
|
|
{
|
2008-03-25 03:02:07 +08:00
|
|
|
struct list_head *head = &root->fs_info->fs_devices->devices;
|
2008-03-25 03:01:56 +08:00
|
|
|
|
2008-03-25 03:02:07 +08:00
|
|
|
return __find_device(head, devid);
|
2008-03-25 03:01:56 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
|
|
|
|
struct extent_buffer *leaf,
|
|
|
|
struct btrfs_chunk *chunk)
|
|
|
|
{
|
|
|
|
struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree;
|
|
|
|
struct map_lookup *map;
|
|
|
|
struct extent_map *em;
|
|
|
|
u64 logical;
|
|
|
|
u64 length;
|
|
|
|
u64 devid;
|
2008-03-26 04:50:33 +08:00
|
|
|
int num_stripes;
|
2008-03-25 03:01:56 +08:00
|
|
|
int ret;
|
2008-03-26 04:50:33 +08:00
|
|
|
int i;
|
2008-03-25 03:01:56 +08:00
|
|
|
|
|
|
|
logical = key->objectid;
|
|
|
|
length = key->offset;
|
|
|
|
spin_lock(&map_tree->map_tree.lock);
|
|
|
|
em = lookup_extent_mapping(&map_tree->map_tree, logical, 1);
|
|
|
|
|
|
|
|
/* already mapped? */
|
|
|
|
if (em && em->start <= logical && em->start + em->len > logical) {
|
|
|
|
free_extent_map(em);
|
|
|
|
spin_unlock(&map_tree->map_tree.lock);
|
|
|
|
return 0;
|
|
|
|
} else if (em) {
|
|
|
|
free_extent_map(em);
|
|
|
|
}
|
|
|
|
spin_unlock(&map_tree->map_tree.lock);
|
|
|
|
|
|
|
|
map = kzalloc(sizeof(*map), GFP_NOFS);
|
|
|
|
if (!map)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
em = alloc_extent_map(GFP_NOFS);
|
|
|
|
if (!em)
|
|
|
|
return -ENOMEM;
|
2008-03-26 04:50:33 +08:00
|
|
|
num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
|
|
|
|
map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS);
|
2008-03-25 03:01:56 +08:00
|
|
|
if (!map) {
|
|
|
|
free_extent_map(em);
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
em->bdev = (struct block_device *)map;
|
|
|
|
em->start = logical;
|
|
|
|
em->len = length;
|
|
|
|
em->block_start = 0;
|
|
|
|
|
2008-03-26 04:50:33 +08:00
|
|
|
map->num_stripes = num_stripes;
|
|
|
|
map->io_width = btrfs_chunk_io_width(leaf, chunk);
|
|
|
|
map->io_align = btrfs_chunk_io_align(leaf, chunk);
|
|
|
|
map->sector_size = btrfs_chunk_sector_size(leaf, chunk);
|
|
|
|
map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk);
|
|
|
|
map->type = btrfs_chunk_type(leaf, chunk);
|
|
|
|
for (i = 0; i < num_stripes; i++) {
|
|
|
|
map->stripes[i].physical =
|
|
|
|
btrfs_stripe_offset_nr(leaf, chunk, i);
|
|
|
|
devid = btrfs_stripe_devid_nr(leaf, chunk, i);
|
|
|
|
map->stripes[i].dev = btrfs_find_device(root, devid);
|
|
|
|
if (!map->stripes[i].dev) {
|
|
|
|
kfree(map);
|
|
|
|
free_extent_map(em);
|
|
|
|
return -EIO;
|
|
|
|
}
|
2008-03-25 03:01:56 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
spin_lock(&map_tree->map_tree.lock);
|
|
|
|
ret = add_extent_mapping(&map_tree->map_tree, em);
|
|
|
|
BUG_ON(ret);
|
|
|
|
spin_unlock(&map_tree->map_tree.lock);
|
|
|
|
free_extent_map(em);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int fill_device_from_item(struct extent_buffer *leaf,
|
|
|
|
struct btrfs_dev_item *dev_item,
|
|
|
|
struct btrfs_device *device)
|
|
|
|
{
|
|
|
|
unsigned long ptr;
|
|
|
|
|
|
|
|
device->devid = btrfs_device_id(leaf, dev_item);
|
|
|
|
device->total_bytes = btrfs_device_total_bytes(leaf, dev_item);
|
|
|
|
device->bytes_used = btrfs_device_bytes_used(leaf, dev_item);
|
|
|
|
device->type = btrfs_device_type(leaf, dev_item);
|
|
|
|
device->io_align = btrfs_device_io_align(leaf, dev_item);
|
|
|
|
device->io_width = btrfs_device_io_width(leaf, dev_item);
|
|
|
|
device->sector_size = btrfs_device_sector_size(leaf, dev_item);
|
|
|
|
|
|
|
|
ptr = (unsigned long)btrfs_device_uuid(dev_item);
|
|
|
|
read_extent_buffer(leaf, device->uuid, ptr, BTRFS_DEV_UUID_SIZE);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-03-25 03:02:07 +08:00
|
|
|
static int read_one_dev(struct btrfs_root *root,
|
2008-03-25 03:01:56 +08:00
|
|
|
struct extent_buffer *leaf,
|
|
|
|
struct btrfs_dev_item *dev_item)
|
|
|
|
{
|
|
|
|
struct btrfs_device *device;
|
|
|
|
u64 devid;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
devid = btrfs_device_id(leaf, dev_item);
|
2008-03-25 03:01:59 +08:00
|
|
|
device = btrfs_find_device(root, devid);
|
|
|
|
if (!device) {
|
2008-03-25 03:02:07 +08:00
|
|
|
printk("warning devid %Lu not found already\n", devid);
|
2008-03-25 03:01:59 +08:00
|
|
|
device = kmalloc(sizeof(*device), GFP_NOFS);
|
|
|
|
if (!device)
|
|
|
|
return -ENOMEM;
|
2008-03-25 03:02:07 +08:00
|
|
|
list_add(&device->dev_list,
|
|
|
|
&root->fs_info->fs_devices->devices);
|
2008-03-25 03:01:59 +08:00
|
|
|
}
|
2008-03-25 03:01:56 +08:00
|
|
|
|
|
|
|
fill_device_from_item(leaf, dev_item, device);
|
|
|
|
device->dev_root = root->fs_info->dev_root;
|
|
|
|
ret = 0;
|
|
|
|
#if 0
|
|
|
|
ret = btrfs_open_device(device);
|
|
|
|
if (ret) {
|
|
|
|
kfree(device);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2008-03-25 03:02:07 +08:00
|
|
|
int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf)
|
|
|
|
{
|
|
|
|
struct btrfs_dev_item *dev_item;
|
|
|
|
|
|
|
|
dev_item = (struct btrfs_dev_item *)offsetof(struct btrfs_super_block,
|
|
|
|
dev_item);
|
|
|
|
return read_one_dev(root, buf, dev_item);
|
|
|
|
}
|
|
|
|
|
2008-03-25 03:01:56 +08:00
|
|
|
int btrfs_read_sys_array(struct btrfs_root *root)
|
|
|
|
{
|
|
|
|
struct btrfs_super_block *super_copy = &root->fs_info->super_copy;
|
|
|
|
struct extent_buffer *sb = root->fs_info->sb_buffer;
|
|
|
|
struct btrfs_disk_key *disk_key;
|
|
|
|
struct btrfs_chunk *chunk;
|
|
|
|
struct btrfs_key key;
|
|
|
|
u32 num_stripes;
|
|
|
|
u32 array_size;
|
|
|
|
u32 len = 0;
|
|
|
|
u8 *ptr;
|
|
|
|
unsigned long sb_ptr;
|
|
|
|
u32 cur;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
array_size = btrfs_super_sys_array_size(super_copy);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* we do this loop twice, once for the device items and
|
|
|
|
* once for all of the chunks. This way there are device
|
|
|
|
* structs filled in for every chunk
|
|
|
|
*/
|
|
|
|
ptr = super_copy->sys_chunk_array;
|
|
|
|
sb_ptr = offsetof(struct btrfs_super_block, sys_chunk_array);
|
|
|
|
cur = 0;
|
|
|
|
|
|
|
|
while (cur < array_size) {
|
|
|
|
disk_key = (struct btrfs_disk_key *)ptr;
|
|
|
|
btrfs_disk_key_to_cpu(&key, disk_key);
|
|
|
|
|
|
|
|
len = sizeof(*disk_key);
|
|
|
|
ptr += len;
|
|
|
|
sb_ptr += len;
|
|
|
|
cur += len;
|
|
|
|
|
2008-03-25 03:02:07 +08:00
|
|
|
if (key.type == BTRFS_CHUNK_ITEM_KEY) {
|
2008-03-25 03:01:56 +08:00
|
|
|
chunk = (struct btrfs_chunk *)sb_ptr;
|
2008-03-25 03:02:07 +08:00
|
|
|
ret = read_one_chunk(root, &key, sb, chunk);
|
|
|
|
BUG_ON(ret);
|
2008-03-25 03:01:56 +08:00
|
|
|
num_stripes = btrfs_chunk_num_stripes(sb, chunk);
|
|
|
|
len = btrfs_chunk_item_size(num_stripes);
|
|
|
|
} else {
|
|
|
|
BUG();
|
|
|
|
}
|
|
|
|
ptr += len;
|
|
|
|
sb_ptr += len;
|
|
|
|
cur += len;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int btrfs_read_chunk_tree(struct btrfs_root *root)
|
|
|
|
{
|
|
|
|
struct btrfs_path *path;
|
|
|
|
struct extent_buffer *leaf;
|
|
|
|
struct btrfs_key key;
|
|
|
|
struct btrfs_key found_key;
|
|
|
|
int ret;
|
|
|
|
int slot;
|
|
|
|
|
|
|
|
root = root->fs_info->chunk_root;
|
|
|
|
|
|
|
|
path = btrfs_alloc_path();
|
|
|
|
if (!path)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
/* first we search for all of the device items, and then we
|
|
|
|
* read in all of the chunk items. This way we can create chunk
|
|
|
|
* mappings that reference all of the devices that are afound
|
|
|
|
*/
|
|
|
|
key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
|
|
|
|
key.offset = 0;
|
|
|
|
key.type = 0;
|
|
|
|
again:
|
|
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
|
|
while(1) {
|
|
|
|
leaf = path->nodes[0];
|
|
|
|
slot = path->slots[0];
|
|
|
|
if (slot >= btrfs_header_nritems(leaf)) {
|
|
|
|
ret = btrfs_next_leaf(root, path);
|
|
|
|
if (ret == 0)
|
|
|
|
continue;
|
|
|
|
if (ret < 0)
|
|
|
|
goto error;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
btrfs_item_key_to_cpu(leaf, &found_key, slot);
|
|
|
|
if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID) {
|
|
|
|
if (found_key.objectid != BTRFS_DEV_ITEMS_OBJECTID)
|
|
|
|
break;
|
|
|
|
if (found_key.type == BTRFS_DEV_ITEM_KEY) {
|
|
|
|
struct btrfs_dev_item *dev_item;
|
|
|
|
dev_item = btrfs_item_ptr(leaf, slot,
|
|
|
|
struct btrfs_dev_item);
|
2008-03-25 03:02:07 +08:00
|
|
|
ret = read_one_dev(root, leaf, dev_item);
|
2008-03-25 03:01:56 +08:00
|
|
|
BUG_ON(ret);
|
|
|
|
}
|
|
|
|
} else if (found_key.type == BTRFS_CHUNK_ITEM_KEY) {
|
|
|
|
struct btrfs_chunk *chunk;
|
|
|
|
chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk);
|
|
|
|
ret = read_one_chunk(root, &found_key, leaf, chunk);
|
|
|
|
}
|
|
|
|
path->slots[0]++;
|
|
|
|
}
|
|
|
|
if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID) {
|
|
|
|
key.objectid = 0;
|
|
|
|
btrfs_release_path(root, path);
|
|
|
|
goto again;
|
|
|
|
}
|
|
|
|
|
|
|
|
btrfs_free_path(path);
|
|
|
|
ret = 0;
|
|
|
|
error:
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|