*/
#include <linux/sched.h>
#include <linux/bio.h>
+#include <linux/buffer_head.h>
#include "ctree.h"
#include "extent_map.h"
#include "disk-io.h"
struct btrfs_device *dev;
u64 physical;
};
+static DEFINE_MUTEX(uuid_mutex);
+static LIST_HEAD(fs_uuids);
+
+int btrfs_cleanup_fs_uuids(void)
+{
+ struct btrfs_fs_devices *fs_devices;
+ struct list_head *uuid_cur;
+ struct list_head *devices_cur;
+ struct btrfs_device *dev;
+
+ list_for_each(uuid_cur, &fs_uuids) {
+ fs_devices = list_entry(uuid_cur, struct btrfs_fs_devices,
+ list);
+ while(!list_empty(&fs_devices->devices)) {
+ devices_cur = fs_devices->devices.next;
+ dev = list_entry(devices_cur, struct btrfs_device,
+ dev_list);
+ printk("uuid cleanup finds %s\n", dev->name);
+ if (dev->bdev) {
+ printk("closing\n");
+ close_bdev_excl(dev->bdev);
+ }
+ list_del(&dev->dev_list);
+ kfree(dev);
+ }
+ }
+ return 0;
+}
+
+static struct btrfs_device *__find_device(struct list_head *head, u64 devid)
+{
+ struct btrfs_device *dev;
+ struct list_head *cur;
+
+ list_for_each(cur, head) {
+ dev = list_entry(cur, struct btrfs_device, dev_list);
+ if (dev->devid == devid)
+ return dev;
+ }
+ return NULL;
+}
+
+static struct btrfs_fs_devices *find_fsid(u8 *fsid)
+{
+ struct list_head *cur;
+ struct btrfs_fs_devices *fs_devices;
+
+ list_for_each(cur, &fs_uuids) {
+ fs_devices = list_entry(cur, struct btrfs_fs_devices, list);
+ if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0)
+ return fs_devices;
+ }
+ return NULL;
+}
+
+static int device_list_add(const char *path,
+ struct btrfs_super_block *disk_super,
+ u64 devid, struct btrfs_fs_devices **fs_devices_ret)
+{
+ struct btrfs_device *device;
+ struct btrfs_fs_devices *fs_devices;
+ u64 found_transid = btrfs_super_generation(disk_super);
+
+ fs_devices = find_fsid(disk_super->fsid);
+ if (!fs_devices) {
+ fs_devices = kmalloc(sizeof(*fs_devices), GFP_NOFS);
+ if (!fs_devices)
+ return -ENOMEM;
+ INIT_LIST_HEAD(&fs_devices->devices);
+ list_add(&fs_devices->list, &fs_uuids);
+ memcpy(fs_devices->fsid, disk_super->fsid, BTRFS_FSID_SIZE);
+ fs_devices->latest_devid = devid;
+ fs_devices->latest_trans = found_transid;
+ fs_devices->lowest_devid = (u64)-1;
+ fs_devices->num_devices = 0;
+ device = NULL;
+ } else {
+ device = __find_device(&fs_devices->devices, devid);
+ }
+ if (!device) {
+ device = kzalloc(sizeof(*device), GFP_NOFS);
+ if (!device) {
+ /* we can safely leave the fs_devices entry around */
+ return -ENOMEM;
+ }
+ device->devid = devid;
+ device->name = kstrdup(path, GFP_NOFS);
+ if (!device->name) {
+ kfree(device);
+ return -ENOMEM;
+ }
+ list_add(&device->dev_list, &fs_devices->devices);
+ fs_devices->num_devices++;
+ }
+
+ if (found_transid > fs_devices->latest_trans) {
+ fs_devices->latest_devid = devid;
+ fs_devices->latest_trans = found_transid;
+ }
+ if (fs_devices->lowest_devid > devid) {
+ fs_devices->lowest_devid = devid;
+ printk("lowest devid now %Lu\n", devid);
+ }
+ *fs_devices_ret = fs_devices;
+ return 0;
+}
+
+int btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
+{
+ struct list_head *head = &fs_devices->devices;
+ struct list_head *cur;
+ struct btrfs_device *device;
+
+ mutex_lock(&uuid_mutex);
+ list_for_each(cur, head) {
+ device = list_entry(cur, struct btrfs_device, dev_list);
+ if (device->bdev) {
+ close_bdev_excl(device->bdev);
+ printk("close devices closes %s\n", device->name);
+ }
+ device->bdev = NULL;
+ }
+ mutex_unlock(&uuid_mutex);
+ return 0;
+}
+
+int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
+ int flags, void *holder)
+{
+ struct block_device *bdev;
+ struct list_head *head = &fs_devices->devices;
+ struct list_head *cur;
+ struct btrfs_device *device;
+ int ret;
+
+ mutex_lock(&uuid_mutex);
+ list_for_each(cur, head) {
+ device = list_entry(cur, struct btrfs_device, dev_list);
+ bdev = open_bdev_excl(device->name, flags, holder);
+printk("opening %s devid %Lu\n", device->name, device->devid);
+ if (IS_ERR(bdev)) {
+ printk("open %s failed\n", device->name);
+ ret = PTR_ERR(bdev);
+ goto fail;
+ }
+ if (device->devid == fs_devices->latest_devid)
+ fs_devices->latest_bdev = bdev;
+ if (device->devid == fs_devices->lowest_devid) {
+ fs_devices->lowest_bdev = bdev;
+printk("lowest bdev %s\n", device->name);
+ }
+ device->bdev = bdev;
+ }
+ mutex_unlock(&uuid_mutex);
+ return 0;
+fail:
+ mutex_unlock(&uuid_mutex);
+ btrfs_close_devices(fs_devices);
+ return ret;
+}
+
+int btrfs_scan_one_device(const char *path, int flags, void *holder,
+ struct btrfs_fs_devices **fs_devices_ret)
+{
+ struct btrfs_super_block *disk_super;
+ struct block_device *bdev;
+ struct buffer_head *bh;
+ int ret;
+ u64 devid;
+
+ mutex_lock(&uuid_mutex);
+
+ printk("scan one opens %s\n", path);
+ bdev = open_bdev_excl(path, flags, holder);
+
+ if (IS_ERR(bdev)) {
+ printk("open failed\n");
+ ret = PTR_ERR(bdev);
+ goto error;
+ }
+
+ ret = set_blocksize(bdev, 4096);
+ if (ret)
+ goto error_close;
+ bh = __bread(bdev, BTRFS_SUPER_INFO_OFFSET / 4096, 4096);
+ if (!bh) {
+ ret = -EIO;
+ goto error_close;
+ }
+ disk_super = (struct btrfs_super_block *)bh->b_data;
+ if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
+ sizeof(disk_super->magic))) {
+ printk("no btrfs found on %s\n", path);
+ ret = -ENOENT;
+ goto error_brelse;
+ }
+ devid = le64_to_cpu(disk_super->dev_item.devid);
+ printk("found device %Lu on %s\n", devid, path);
+ ret = device_list_add(path, disk_super, devid, fs_devices_ret);
+
+error_brelse:
+ brelse(bh);
+error_close:
+ close_bdev_excl(bdev);
+ printk("scan one closes bdev %s\n", path);
+error:
+ mutex_unlock(&uuid_mutex);
+ return ret;
+}
/*
* this uses a pretty simple search, the expectation is that it is
/* FIXME use last free of some kind */
+ /* we don't want to overwrite the superblock on the drive,
+ * so we make sure to start at an offset of at least 1MB
+ */
+ search_start = max((u64)1024 * 1024, search_start);
key.objectid = device->devid;
key.offset = search_start;
key.type = BTRFS_DEV_EXTENT_KEY;
leaf = path->nodes[0];
dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item);
+ device->devid = free_devid;
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);
struct btrfs_device *device = NULL;
struct btrfs_chunk *chunk;
struct list_head private_devs;
- struct list_head *dev_list = &extent_root->fs_info->devices;
+ struct list_head *dev_list = &extent_root->fs_info->fs_devices->devices;
struct list_head *cur;
struct extent_map_tree *em_tree;
struct map_lookup *map;
key.objectid,
calc_size, &dev_offset);
BUG_ON(ret);
-
+printk("alloc chunk size %Lu from dev %Lu\n", calc_size, device->devid);
device->bytes_used += calc_size;
ret = btrfs_update_device(trans, device);
BUG_ON(ret);
struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid)
{
- struct btrfs_device *dev;
- struct list_head *cur = root->fs_info->devices.next;
- struct list_head *head = &root->fs_info->devices;
+ struct list_head *head = &root->fs_info->fs_devices->devices;
- while(cur != head) {
- dev = list_entry(cur, struct btrfs_device, dev_list);
- if (dev->devid == devid)
- return dev;
- cur = cur->next;
- }
- return NULL;
+ return __find_device(head, devid);
}
static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
devid = btrfs_device_id(leaf, dev_item);
device = btrfs_find_device(root, devid);
if (!device) {
+ printk("warning devid %Lu not found already\n", devid);
device = kmalloc(sizeof(*device), GFP_NOFS);
if (!device)
return -ENOMEM;
- list_add(&device->dev_list, &root->fs_info->devices);
+ list_add(&device->dev_list,
+ &root->fs_info->fs_devices->devices);
}
fill_device_from_item(leaf, dev_item, device);
device->dev_root = root->fs_info->dev_root;
- device->bdev = root->fs_info->sb->s_bdev;
ret = 0;
#if 0
ret = btrfs_open_device(device);
projects / mv-sheeva.git / blobdiff