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Btrfs: Move device information into the super block so it can be scanned 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-03-24 15:02:07 -04:00
parent e085def2c4
commit 0d81ba5dbe
5 changed files with 23 additions and 91 deletions
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21
fs/btrfs/ctree.h
View File

@ -150,21 +150,11 @@ struct btrfs_dev_item {
/* minimal io size for this device */
__le32 sector_size;
/* the kernel device number */
__le64 rdev;
/* type and info about this device */
__le64 type;
/* partition number, 0 for whole dev */
__le32 partition;
/* length of the name data at the end of the item */
__le16 name_len;
/* physical drive uuid (or lvm uuid) */
/* btrfs generated uuid for this device */
u8 uuid[BTRFS_DEV_UUID_SIZE];
/* name goes here */
} __attribute__ ((__packed__));
struct btrfs_stripe {
@ -255,6 +245,7 @@ struct btrfs_super_block {
__le32 sys_chunk_array_size;
u8 root_level;
u8 chunk_root_level;
struct btrfs_dev_item dev_item;
u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
} __attribute__ ((__packed__));
@ -685,20 +676,12 @@ BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
BTRFS_SETGET_FUNCS(device_rdev, struct btrfs_dev_item, rdev, 64);
BTRFS_SETGET_FUNCS(device_partition, struct btrfs_dev_item, partition, 32);
BTRFS_SETGET_FUNCS(device_name_len, struct btrfs_dev_item, name_len, 16);
static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
{
return (char *)d + offsetof(struct btrfs_dev_item, uuid);
}
static inline char *btrfs_device_name(struct btrfs_dev_item *d)
{
return (char *)(d + 1);
}
BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);

4
fs/btrfs/disk-io.c
View File

@ -370,7 +370,6 @@ static int close_all_devices(struct btrfs_fs_info *fs_info)
next = list->next;
list_del(next);
device = list_entry(next, struct btrfs_device, dev_list);
kfree(device->name);
kfree(device);
}
return 0;
@ -800,6 +799,9 @@ struct btrfs_root *open_ctree(struct super_block *sb)
}
mutex_lock(&fs_info->fs_mutex);
ret = btrfs_read_super_device(tree_root, fs_info->sb_buffer);
BUG_ON(ret);
ret = btrfs_read_sys_array(tree_root);
BUG_ON(ret);

15
fs/btrfs/print-tree.c
View File

@ -37,22 +37,11 @@ static void print_chunk(struct extent_buffer *eb, struct btrfs_chunk *chunk)
static void print_dev_item(struct extent_buffer *eb,
struct btrfs_dev_item *dev_item)
{
char *name;
int name_len;
name_len = btrfs_device_name_len(eb, dev_item);
name = kmalloc(name_len, GFP_NOFS);
if (name) {
read_extent_buffer(eb, name,
(unsigned long)btrfs_device_name(dev_item),
name_len);
}
printk("\t\tdev item name %.*s devid %llu "
"total_bytes %llu bytes used %Lu\n", name_len, name,
printk("\t\tdev item devid %llu "
"total_bytes %llu bytes used %Lu\n",
(unsigned long long)btrfs_device_id(eb, dev_item),
(unsigned long long)btrfs_device_total_bytes(eb, dev_item),
(unsigned long long)btrfs_device_bytes_used(eb, dev_item));
kfree(name);
}
void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
{

61
fs/btrfs/volumes.c
View File

@ -278,7 +278,7 @@ int btrfs_add_device(struct btrfs_trans_handle *trans,
key.offset = free_devid;
ret = btrfs_insert_empty_item(trans, root, path, &key,
sizeof(*dev_item) + device->name_len);
sizeof(*dev_item));
if (ret)
goto out;
@ -290,15 +290,9 @@ int btrfs_add_device(struct btrfs_trans_handle *trans,
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_rdev(leaf, dev_item, device->rdev);
btrfs_set_device_partition(leaf, dev_item, device->partition);
btrfs_set_device_name_len(leaf, dev_item, device->name_len);
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_name(dev_item);
write_extent_buffer(leaf, device->name, ptr, device->name_len);
ptr = (unsigned long)btrfs_device_uuid(dev_item);
write_extent_buffer(leaf, device->uuid, ptr, BTRFS_DEV_UUID_SIZE);
btrfs_mark_buffer_dirty(leaf);
@ -345,8 +339,6 @@ int btrfs_update_device(struct btrfs_trans_handle *trans,
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_rdev(leaf, dev_item, device->rdev);
btrfs_set_device_partition(leaf, dev_item, device->partition);
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);
@ -676,7 +668,6 @@ static int fill_device_from_item(struct extent_buffer *leaf,
struct btrfs_device *device)
{
unsigned long ptr;
char *name;
device->devid = btrfs_device_id(leaf, dev_item);
device->total_bytes = btrfs_device_total_bytes(leaf, dev_item);
@ -685,24 +676,14 @@ static int fill_device_from_item(struct extent_buffer *leaf,
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);
device->rdev = btrfs_device_rdev(leaf, dev_item);
device->partition = btrfs_device_partition(leaf, dev_item);
device->name_len = btrfs_device_name_len(leaf, dev_item);
ptr = (unsigned long)btrfs_device_uuid(dev_item);
read_extent_buffer(leaf, device->uuid, ptr, BTRFS_DEV_UUID_SIZE);
name = kmalloc(device->name_len + 1, GFP_NOFS);
if (!name)
return -ENOMEM;
device->name = name;
ptr = (unsigned long)btrfs_device_name(dev_item);
read_extent_buffer(leaf, name, ptr, device->name_len);
name[device->name_len] = '\0';
return 0;
}
static int read_one_dev(struct btrfs_root *root, struct btrfs_key *key,
static int read_one_dev(struct btrfs_root *root,
struct extent_buffer *leaf,
struct btrfs_dev_item *dev_item)
{
@ -722,7 +703,6 @@ static int read_one_dev(struct btrfs_root *root, struct btrfs_key *key,
fill_device_from_item(leaf, dev_item, device);
device->dev_root = root->fs_info->dev_root;
device->bdev = root->fs_info->sb->s_bdev;
memcpy(&device->dev_key, key, sizeof(*key));
ret = 0;
#if 0
ret = btrfs_open_device(device);
@ -733,12 +713,20 @@ static int read_one_dev(struct btrfs_root *root, struct btrfs_key *key,
return ret;
}
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);
}
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_dev_item *dev_item;
struct btrfs_chunk *chunk;
struct btrfs_key key;
u32 num_stripes;
@ -748,7 +736,6 @@ int btrfs_read_sys_array(struct btrfs_root *root)
unsigned long sb_ptr;
u32 cur;
int ret;
int dev_only = 1;
array_size = btrfs_super_sys_array_size(super_copy);
@ -757,7 +744,6 @@ int btrfs_read_sys_array(struct btrfs_root *root)
* once for all of the chunks. This way there are device
* structs filled in for every chunk
*/
again:
ptr = super_copy->sys_chunk_array;
sb_ptr = offsetof(struct btrfs_super_block, sys_chunk_array);
cur = 0;
@ -771,22 +757,10 @@ again:
sb_ptr += len;
cur += len;
if (key.objectid == BTRFS_DEV_ITEMS_OBJECTID &&
key.type == BTRFS_DEV_ITEM_KEY) {
dev_item = (struct btrfs_dev_item *)sb_ptr;
if (dev_only) {
ret = read_one_dev(root, &key, sb, dev_item);
BUG_ON(ret);
}
len = sizeof(*dev_item);
len += btrfs_device_name_len(sb, dev_item);
} else if (key.type == BTRFS_CHUNK_ITEM_KEY) {
if (key.type == BTRFS_CHUNK_ITEM_KEY) {
chunk = (struct btrfs_chunk *)sb_ptr;
if (!dev_only) {
ret = read_one_chunk(root, &key, sb, chunk);
BUG_ON(ret);
}
ret = read_one_chunk(root, &key, sb, chunk);
BUG_ON(ret);
num_stripes = btrfs_chunk_num_stripes(sb, chunk);
len = btrfs_chunk_item_size(num_stripes);
} else {
@ -796,10 +770,6 @@ again:
sb_ptr += len;
cur += len;
}
if (dev_only == 1) {
dev_only = 0;
goto again;
}
return 0;
}
@ -846,8 +816,7 @@ again:
struct btrfs_dev_item *dev_item;
dev_item = btrfs_item_ptr(leaf, slot,
struct btrfs_dev_item);
ret = read_one_dev(root, &found_key, leaf,
dev_item);
ret = read_one_dev(root, leaf, dev_item);
BUG_ON(ret);
}
} else if (found_key.type == BTRFS_CHUNK_ITEM_KEY) {

13
fs/btrfs/volumes.h
View File

@ -21,7 +21,6 @@
struct btrfs_device {
struct list_head dev_list;
struct btrfs_root *dev_root;
struct btrfs_key dev_key;
struct block_device *bdev;
@ -43,22 +42,11 @@ struct btrfs_device {
/* minimal io size for this device */
u32 sector_size;
/* the kernel device number */
u64 rdev;
/* type and info about this device */
u64 type;
/* partition number, 0 for whole dev */
int partition;
/* length of the name data at the end of the item */
int name_len;
/* physical drive uuid (or lvm uuid) */
u8 uuid[BTRFS_DEV_UUID_SIZE];
char *name;
};
int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
@ -75,4 +63,5 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio);
int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
#endif