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Use device uuids when scanning devices

This commit is contained in:
Chris Mason 2008-04-18 10:31:42 -04:00 committed by David Woodhouse
parent 1f81c1b6fc
commit d25165e95c
2 changed files with 27 additions and 7 deletions
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5
ctree.h
View File

@ -745,6 +745,11 @@ static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
return (struct btrfs_stripe *)offset;
}
static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
{
return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
}
static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
struct btrfs_chunk *c, int nr)
{

29
volumes.c
View File

@ -52,15 +52,18 @@ struct map_lookup {
static LIST_HEAD(fs_uuids);
static struct btrfs_device *__find_device(struct list_head *head, u64 devid)
static struct btrfs_device *__find_device(struct list_head *head, u64 devid,
u8 *uuid)
{
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)
if (dev->devid == devid &&
!memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE)) {
return dev;
}
}
return NULL;
}
@ -99,7 +102,8 @@ static int device_list_add(const char *path,
fs_devices->lowest_devid = (u64)-1;
device = NULL;
} else {
device = __find_device(&fs_devices->devices, devid);
device = __find_device(&fs_devices->devices, devid,
disk_super->dev_item.uuid);
}
if (!device) {
device = kzalloc(sizeof(*device), GFP_NOFS);
@ -108,6 +112,8 @@ static int device_list_add(const char *path,
return -ENOMEM;
}
device->devid = devid;
memcpy(device->uuid, disk_super->dev_item.uuid,
BTRFS_UUID_SIZE);
device->name = kstrdup(path, GFP_NOFS);
if (!device->name) {
kfree(device);
@ -919,11 +925,12 @@ out:
return 0;
}
struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid)
struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
u8 *uuid)
{
struct list_head *head = &root->fs_info->fs_devices->devices;
return __find_device(head, devid);
return __find_device(head, devid, uuid);
}
int btrfs_bootstrap_super_map(struct btrfs_mapping_tree *map_tree,
@ -990,6 +997,7 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
u64 length;
u64 devid;
u64 super_offset_diff = 0;
u8 uuid[BTRFS_UUID_SIZE];
int num_stripes;
int ret;
int i;
@ -1030,7 +1038,10 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
btrfs_stripe_offset_nr(leaf, chunk, i) +
super_offset_diff;
devid = btrfs_stripe_devid_nr(leaf, chunk, i);
map->stripes[i].dev = btrfs_find_device(root, devid);
read_extent_buffer(leaf, uuid, (unsigned long)
btrfs_stripe_dev_uuid_nr(chunk, i),
BTRFS_UUID_SIZE);
map->stripes[i].dev = btrfs_find_device(root, devid, uuid);
if (!map->stripes[i].dev) {
kfree(map);
return -EIO;
@ -1070,9 +1081,13 @@ static int read_one_dev(struct btrfs_root *root,
struct btrfs_device *device;
u64 devid;
int ret = 0;
u8 dev_uuid[BTRFS_UUID_SIZE];
devid = btrfs_device_id(leaf, dev_item);
device = btrfs_find_device(root, devid);
read_extent_buffer(leaf, dev_uuid,
(unsigned long)btrfs_device_uuid(dev_item),
BTRFS_UUID_SIZE);
device = btrfs_find_device(root, devid, dev_uuid);
if (!device) {
printk("warning devid %llu not found already\n",
(unsigned long long)devid);