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Btrfs: Make the resizer work based on shrinking and growing devices 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-04-25 16:53:30 -04:00
parent 5e478dc982
commit 8f18cf1339
6 changed files with 407 additions and 108 deletions
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1
fs/btrfs/ctree.h
View File

@ -474,6 +474,7 @@ struct btrfs_block_group_cache {
u64 pinned;
u64 flags;
int cached;
int ro;
};
struct btrfs_device;

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

@ -818,6 +818,10 @@ struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
return fs_info->tree_root;
if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
return fs_info->extent_root;
if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
return fs_info->chunk_root;
if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
return fs_info->dev_root;
root = radix_tree_lookup(&fs_info->fs_roots_radix,
(unsigned long)location->objectid);

145
fs/btrfs/extent-tree.c
View File

@ -187,6 +187,7 @@ static int noinline find_search_start(struct btrfs_root *root,
if (!cache)
goto out;
total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
free_space_cache = &root->fs_info->free_space_cache;
@ -196,7 +197,7 @@ again:
goto out;
last = max(search_start, cache->key.objectid);
if (!block_group_bits(cache, data)) {
if (!block_group_bits(cache, data) || cache->ro) {
goto new_group;
}
@ -221,6 +222,8 @@ again:
continue;
}
spin_unlock_irq(&free_space_cache->lock);
if (cache->ro)
goto new_group;
if (start + num > cache->key.objectid + cache->key.offset)
goto new_group;
if (start + num > total_fs_bytes)
@ -319,7 +322,7 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
if (search_start && search_start < total_fs_bytes) {
struct btrfs_block_group_cache *shint;
shint = btrfs_lookup_block_group(info, search_start);
if (shint && block_group_bits(shint, data)) {
if (shint && block_group_bits(shint, data) && !shint->ro) {
used = btrfs_block_group_used(&shint->item);
if (used + shint->pinned <
div_factor(shint->key.offset, factor)) {
@ -327,7 +330,7 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
}
}
}
if (hint && block_group_bits(hint, data) &&
if (hint && !hint->ro && block_group_bits(hint, data) &&
hint->key.objectid < total_fs_bytes) {
used = btrfs_block_group_used(&hint->item);
if (used + hint->pinned <
@ -364,7 +367,7 @@ again:
if (cache->key.objectid > total_fs_bytes)
break;
if (block_group_bits(cache, data)) {
if (!cache->ro && block_group_bits(cache, data)) {
if (full_search)
free_check = cache->key.offset;
else
@ -1020,6 +1023,7 @@ static int update_space_info(struct btrfs_fs_info *info, u64 flags,
if (found) {
found->total_bytes += total_bytes;
found->bytes_used += bytes_used;
found->full = 0;
WARN_ON(found->total_bytes < found->bytes_used);
*space_info = found;
return 0;
@ -1700,7 +1704,6 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
u64 super_used;
u64 root_used;
u64 search_start = 0;
u64 new_hint;
u64 alloc_profile;
u32 sizes[2];
struct btrfs_fs_info *info = root->fs_info;
@ -1724,7 +1727,7 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile;
}
again:
if (root->ref_cows) {
if (root != root->fs_info->extent_root) {
if (!(data & BTRFS_BLOCK_GROUP_METADATA)) {
ret = do_chunk_alloc(trans, root->fs_info->extent_root,
2 * 1024 * 1024,
@ -1738,10 +1741,6 @@ again:
BUG_ON(ret);
}
new_hint = max(hint_byte, root->fs_info->alloc_start);
if (new_hint < btrfs_super_total_bytes(&info->super_copy))
hint_byte = new_hint;
WARN_ON(num_bytes < root->sectorsize);
ret = find_free_extent(trans, root, num_bytes, empty_size,
search_start, search_end, hint_byte, ins,
@ -2473,15 +2472,16 @@ out:
return ret;
}
int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size)
int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 shrink_start)
{
struct btrfs_trans_handle *trans;
struct btrfs_root *tree_root = root->fs_info->tree_root;
struct btrfs_path *path;
u64 cur_byte;
u64 total_found;
u64 shrink_last_byte;
struct btrfs_block_group_cache *shrink_block_group;
struct btrfs_fs_info *info = root->fs_info;
struct extent_io_tree *block_group_cache;
struct btrfs_key key;
struct btrfs_key found_key;
struct extent_buffer *leaf;
@ -2489,17 +2489,29 @@ int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size)
int ret;
int progress = 0;
btrfs_set_super_total_bytes(&info->super_copy, new_size);
clear_extent_dirty(&info->free_space_cache, new_size, (u64)-1,
GFP_NOFS);
block_group_cache = &info->block_group_cache;
shrink_block_group = btrfs_lookup_block_group(root->fs_info,
shrink_start);
BUG_ON(!shrink_block_group);
shrink_last_byte = shrink_start + shrink_block_group->key.offset;
shrink_block_group->space_info->total_bytes -=
shrink_block_group->key.offset;
printk("shrink_extent_tree %Lu -> %Lu type %Lu\n", shrink_start, shrink_last_byte, shrink_block_group->flags);
path = btrfs_alloc_path();
root = root->fs_info->extent_root;
path->reada = 2;
again:
trans = btrfs_start_transaction(root, 1);
do_chunk_alloc(trans, root->fs_info->extent_root,
btrfs_block_group_used(&shrink_block_group->item) +
2 * 1024 * 1024, shrink_block_group->flags);
btrfs_end_transaction(trans, root);
shrink_block_group->ro = 1;
total_found = 0;
key.objectid = new_size;
key.objectid = shrink_start;
key.offset = 0;
key.type = 0;
cur_byte = key.objectid;
@ -2511,10 +2523,12 @@ again:
ret = btrfs_previous_item(root, path, 0, BTRFS_EXTENT_ITEM_KEY);
if (ret < 0)
goto out;
if (ret == 0) {
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
if (found_key.objectid + found_key.offset > new_size) {
if (found_key.objectid + found_key.offset > shrink_start &&
found_key.objectid < shrink_last_byte) {
cur_byte = found_key.objectid;
key.objectid = cur_byte;
}
@ -2543,6 +2557,9 @@ next:
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
if (found_key.objectid >= shrink_last_byte)
break;
if (progress && need_resched()) {
memcpy(&key, &found_key, sizeof(key));
mutex_unlock(&root->fs_info->fs_mutex);
@ -2583,68 +2600,31 @@ next:
goto again;
}
/*
* we've freed all the extents, now remove the block
* group item from the tree
*/
trans = btrfs_start_transaction(root, 1);
key.objectid = new_size;
key.offset = 0;
key.type = 0;
while(1) {
u64 ptr;
memcpy(&key, &shrink_block_group->key, sizeof(key));
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret < 0)
goto out;
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret > 0)
ret = -EIO;
if (ret < 0)
goto out;
leaf = path->nodes[0];
nritems = btrfs_header_nritems(leaf);
bg_next:
if (path->slots[0] >= nritems) {
ret = btrfs_next_leaf(root, path);
if (ret < 0)
break;
if (ret == 1) {
ret = 0;
break;
}
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
leaf = path->nodes[0];
nritems = btrfs_header_nritems(leaf);
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
kfree(shrink_block_group);
/*
* btrfs_next_leaf doesn't cow buffers, we have to
* do the search again
*/
memcpy(&key, &found_key, sizeof(key));
btrfs_release_path(root, path);
goto resched_check;
}
clear_extent_bits(&info->block_group_cache, found_key.objectid,
found_key.objectid + found_key.offset - 1,
(unsigned int)-1, GFP_NOFS);
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
if (btrfs_key_type(&found_key) != BTRFS_BLOCK_GROUP_ITEM_KEY) {
printk("shrinker found key %Lu %u %Lu\n",
found_key.objectid, found_key.type,
found_key.offset);
path->slots[0]++;
goto bg_next;
}
ret = get_state_private(&info->block_group_cache,
found_key.objectid, &ptr);
if (!ret)
kfree((void *)(unsigned long)ptr);
clear_extent_bits(&info->block_group_cache, found_key.objectid,
found_key.objectid + found_key.offset - 1,
(unsigned int)-1, GFP_NOFS);
key.objectid = found_key.objectid + 1;
btrfs_del_item(trans, root, path);
btrfs_release_path(root, path);
resched_check:
if (need_resched()) {
mutex_unlock(&root->fs_info->fs_mutex);
cond_resched();
mutex_lock(&root->fs_info->fs_mutex);
}
}
clear_extent_dirty(&info->free_space_cache, new_size, (u64)-1,
btrfs_del_item(trans, root, path);
clear_extent_dirty(&info->free_space_cache,
shrink_start, shrink_last_byte - 1,
GFP_NOFS);
btrfs_commit_transaction(trans, root);
out:
@ -2652,13 +2632,6 @@ out:
return ret;
}
int btrfs_grow_extent_tree(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 new_size)
{
btrfs_set_super_total_bytes(&root->fs_info->super_copy, new_size);
return 0;
}
int find_first_block_group(struct btrfs_root *root, struct btrfs_path *path,
struct btrfs_key *key)
{
@ -2726,7 +2699,7 @@ int btrfs_read_block_groups(struct btrfs_root *root)
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
cache = kmalloc(sizeof(*cache), GFP_NOFS);
cache = kzalloc(sizeof(*cache), GFP_NOFS);
if (!cache) {
ret = -ENOMEM;
break;
@ -2736,8 +2709,6 @@ int btrfs_read_block_groups(struct btrfs_root *root)
btrfs_item_ptr_offset(leaf, path->slots[0]),
sizeof(cache->item));
memcpy(&cache->key, &found_key, sizeof(found_key));
cache->cached = 0;
cache->pinned = 0;
key.objectid = found_key.objectid + found_key.offset;
btrfs_release_path(root, path);
@ -2789,12 +2760,10 @@ int btrfs_make_block_group(struct btrfs_trans_handle *trans,
extent_root = root->fs_info->extent_root;
block_group_cache = &root->fs_info->block_group_cache;
cache = kmalloc(sizeof(*cache), GFP_NOFS);
cache = kzalloc(sizeof(*cache), GFP_NOFS);
BUG_ON(!cache);
cache->key.objectid = chunk_offset;
cache->key.offset = size;
cache->cached = 0;
cache->pinned = 0;
btrfs_set_key_type(&cache->key, BTRFS_BLOCK_GROUP_ITEM_KEY);
memset(&cache->item, 0, sizeof(cache->item));

36
fs/btrfs/inode.c
View File

@ -16,6 +16,7 @@
* Boston, MA 021110-1307, USA.
*/
#include <linux/kernel.h>
#include <linux/bio.h>
#include <linux/buffer_head.h>
#include <linux/fs.h>
@ -2887,9 +2888,12 @@ static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
{
u64 new_size;
u64 old_size;
u64 devid = 1;
struct btrfs_ioctl_vol_args *vol_args;
struct btrfs_trans_handle *trans;
struct btrfs_device *device = NULL;
char *sizestr;
char *devstr = NULL;
int ret = 0;
int namelen;
int mod = 0;
@ -2909,9 +2913,25 @@ static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
goto out;
}
mutex_lock(&root->fs_info->fs_mutex);
sizestr = vol_args->name;
devstr = strchr(sizestr, ':');
if (devstr) {
char *end;
sizestr = devstr + 1;
*devstr = '\0';
devstr = vol_args->name;
devid = simple_strtoull(devstr, &end, 10);
printk("resizing devid %Lu\n", devid);
}
device = btrfs_find_device(root, devid, NULL);
if (!device) {
printk("resizer unable to find device %Lu\n", devid);
ret = -EINVAL;
goto out_unlock;
}
if (!strcmp(sizestr, "max"))
new_size = root->fs_info->sb->s_bdev->bd_inode->i_size;
new_size = device->bdev->bd_inode->i_size;
else {
if (sizestr[0] == '-') {
mod = -1;
@ -2923,12 +2943,11 @@ static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
new_size = btrfs_parse_size(sizestr);
if (new_size == 0) {
ret = -EINVAL;
goto out;
goto out_unlock;
}
}
mutex_lock(&root->fs_info->fs_mutex);
old_size = btrfs_super_total_bytes(&root->fs_info->super_copy);
old_size = device->total_bytes;
if (mod < 0) {
if (new_size > old_size) {
@ -2944,7 +2963,7 @@ static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
ret = -EINVAL;
goto out_unlock;
}
if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) {
if (new_size > device->bdev->bd_inode->i_size) {
ret = -EFBIG;
goto out_unlock;
}
@ -2952,13 +2971,14 @@ static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
do_div(new_size, root->sectorsize);
new_size *= root->sectorsize;
printk("new size is %Lu\n", new_size);
printk("new size for %s is %llu\n", device->name, (unsigned long long)new_size);
if (new_size > old_size) {
trans = btrfs_start_transaction(root, 1);
ret = btrfs_grow_extent_tree(trans, root, new_size);
ret = btrfs_grow_device(trans, device, new_size);
btrfs_commit_transaction(trans, root);
} else {
ret = btrfs_shrink_extent_tree(root, new_size);
ret = btrfs_shrink_device(device, new_size);
}
out_unlock:

324
fs/btrfs/volumes.c
View File

@ -77,7 +77,7 @@ static struct btrfs_device *__find_device(struct list_head *head, u64 devid,
list_for_each(cur, head) {
dev = list_entry(cur, struct btrfs_device, dev_list);
if (dev->devid == devid &&
!memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE)) {
(!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) {
return dev;
}
}
@ -293,6 +293,10 @@ static int find_free_dev_extent(struct btrfs_trans_handle *trans,
* so we make sure to start at an offset of at least 1MB
*/
search_start = max((u64)1024 * 1024, search_start);
if (root->fs_info->alloc_start + num_bytes <= device->total_bytes)
search_start = max(root->fs_info->alloc_start, search_start);
key.objectid = device->devid;
key.offset = search_start;
key.type = BTRFS_DEV_EXTENT_KEY;
@ -380,6 +384,33 @@ error:
return ret;
}
int btrfs_free_dev_extent(struct btrfs_trans_handle *trans,
struct btrfs_device *device,
u64 start)
{
int ret;
struct btrfs_path *path;
struct btrfs_root *root = device->dev_root;
struct btrfs_key key;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = device->devid;
key.offset = start;
key.type = BTRFS_DEV_EXTENT_KEY;
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
BUG_ON(ret);
ret = btrfs_del_item(trans, root, path);
BUG_ON(ret);
btrfs_free_path(path);
return ret;
}
int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
struct btrfs_device *device,
u64 chunk_tree, u64 chunk_objectid,
@ -560,6 +591,7 @@ out:
btrfs_free_path(path);
return ret;
}
int btrfs_update_device(struct btrfs_trans_handle *trans,
struct btrfs_device *device)
{
@ -606,6 +638,254 @@ out:
return ret;
}
int btrfs_grow_device(struct btrfs_trans_handle *trans,
struct btrfs_device *device, u64 new_size)
{
struct btrfs_super_block *super_copy =
&device->dev_root->fs_info->super_copy;
u64 old_total = btrfs_super_total_bytes(super_copy);
u64 diff = new_size - device->total_bytes;
btrfs_set_super_total_bytes(super_copy, old_total + diff);
return btrfs_update_device(trans, device);
}
static int btrfs_free_chunk(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 chunk_tree, u64 chunk_objectid,
u64 chunk_offset)
{
int ret;
struct btrfs_path *path;
struct btrfs_key key;
root = root->fs_info->chunk_root;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = chunk_objectid;
key.offset = chunk_offset;
key.type = BTRFS_CHUNK_ITEM_KEY;
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
BUG_ON(ret);
ret = btrfs_del_item(trans, root, path);
BUG_ON(ret);
btrfs_free_path(path);
return 0;
}
int btrfs_del_sys_chunk(struct btrfs_root *root, u64 chunk_objectid, u64
chunk_offset)
{
struct btrfs_super_block *super_copy = &root->fs_info->super_copy;
struct btrfs_disk_key *disk_key;
struct btrfs_chunk *chunk;
u8 *ptr;
int ret = 0;
u32 num_stripes;
u32 array_size;
u32 len = 0;
u32 cur;
struct btrfs_key key;
array_size = btrfs_super_sys_array_size(super_copy);
ptr = super_copy->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);
if (key.type == BTRFS_CHUNK_ITEM_KEY) {
chunk = (struct btrfs_chunk *)(ptr + len);
num_stripes = btrfs_stack_chunk_num_stripes(chunk);
len += btrfs_chunk_item_size(num_stripes);
} else {
ret = -EIO;
break;
}
if (key.objectid == chunk_objectid &&
key.offset == chunk_offset) {
memmove(ptr, ptr + len, array_size - (cur + len));
array_size -= len;
btrfs_set_super_sys_array_size(super_copy, array_size);
} else {
ptr += len;
cur += len;
}
}
return ret;
}
int btrfs_relocate_chunk(struct btrfs_root *root,
u64 chunk_tree, u64 chunk_objectid,
u64 chunk_offset)
{
struct extent_map_tree *em_tree;
struct btrfs_root *extent_root;
struct btrfs_trans_handle *trans;
struct extent_map *em;
struct map_lookup *map;
int ret;
int i;
root = root->fs_info->chunk_root;
extent_root = root->fs_info->extent_root;
em_tree = &root->fs_info->mapping_tree.map_tree;
/* step one, relocate all the extents inside this chunk */
ret = btrfs_shrink_extent_tree(extent_root, chunk_offset);
BUG_ON(ret);
trans = btrfs_start_transaction(root, 1);
BUG_ON(!trans);
/*
* step two, delete the device extents and the
* chunk tree entries
*/
spin_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, chunk_offset, 1);
spin_unlock(&em_tree->lock);
BUG_ON(em->start > chunk_offset || em->start + em->len < chunk_offset);
map = (struct map_lookup *)em->bdev;
for (i = 0; i < map->num_stripes; i++) {
ret = btrfs_free_dev_extent(trans, map->stripes[i].dev,
map->stripes[i].physical);
BUG_ON(ret);
}
ret = btrfs_free_chunk(trans, root, chunk_tree, chunk_objectid,
chunk_offset);
BUG_ON(ret);
if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) {
ret = btrfs_del_sys_chunk(root, chunk_objectid, chunk_offset);
BUG_ON(ret);
goto out;
}
spin_lock(&em_tree->lock);
remove_extent_mapping(em_tree, em);
kfree(map);
em->bdev = NULL;
/* once for the tree */
free_extent_map(em);
spin_unlock(&em_tree->lock);
out:
/* once for us */
free_extent_map(em);
btrfs_end_transaction(trans, root);
return 0;
}
/*
* shrinking a device means finding all of the device extents past
* the new size, and then following the back refs to the chunks.
* The chunk relocation code actually frees the device extent
*/
int btrfs_shrink_device(struct btrfs_device *device, u64 new_size)
{
struct btrfs_trans_handle *trans;
struct btrfs_root *root = device->dev_root;
struct btrfs_dev_extent *dev_extent = NULL;
struct btrfs_path *path;
u64 length;
u64 chunk_tree;
u64 chunk_objectid;
u64 chunk_offset;
int ret;
int slot;
struct extent_buffer *l;
struct btrfs_key key;
struct btrfs_super_block *super_copy = &root->fs_info->super_copy;
u64 old_total = btrfs_super_total_bytes(super_copy);
u64 diff = device->total_bytes - new_size;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
trans = btrfs_start_transaction(root, 1);
if (!trans) {
ret = -ENOMEM;
goto done;
}
path->reada = 2;
device->total_bytes = new_size;
ret = btrfs_update_device(trans, device);
if (ret) {
btrfs_end_transaction(trans, root);
goto done;
}
WARN_ON(diff > old_total);
btrfs_set_super_total_bytes(super_copy, old_total - diff);
btrfs_end_transaction(trans, root);
key.objectid = device->devid;
key.offset = (u64)-1;
key.type = BTRFS_DEV_EXTENT_KEY;
while (1) {
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
goto done;
ret = btrfs_previous_item(root, path, 0, key.type);
if (ret < 0)
goto done;
if (ret) {
ret = 0;
goto done;
}
l = path->nodes[0];
slot = path->slots[0];
btrfs_item_key_to_cpu(l, &key, path->slots[0]);
if (key.objectid != device->devid)
goto done;
dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent);
length = btrfs_dev_extent_length(l, dev_extent);
if (key.offset + length <= new_size)
goto done;
chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent);
chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent);
chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent);
btrfs_release_path(root, path);
ret = btrfs_relocate_chunk(root, chunk_tree, chunk_objectid,
chunk_offset);
if (ret)
goto done;
}
done:
btrfs_free_path(path);
return ret;
}
int btrfs_add_system_chunk(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_key *key,
@ -658,6 +938,7 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
u64 dev_offset;
struct btrfs_fs_info *info = extent_root->fs_info;
struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root;
struct btrfs_path *path;
struct btrfs_stripe *stripes;
struct btrfs_device *device = NULL;
struct btrfs_chunk *chunk;
@ -724,6 +1005,10 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
min_stripe_size = 1 * 1024 * 1024;
}
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
/* we don't want a chunk larger than 10% of the FS */
percent_max = div_factor(btrfs_super_total_bytes(&info->super_copy), 1);
max_chunk_size = min(percent_max, max_chunk_size);
@ -759,11 +1044,19 @@ again:
avail = device->total_bytes - device->bytes_used;
cur = cur->next;
if (avail >= min_free) {
list_move_tail(&device->dev_alloc_list, &private_devs);
index++;
if (type & BTRFS_BLOCK_GROUP_DUP)
u64 ignored_start = 0;
ret = find_free_dev_extent(trans, device, path,
min_free,
&ignored_start);
if (ret == 0) {
list_move_tail(&device->dev_alloc_list,
&private_devs);
index++;
if (type & BTRFS_BLOCK_GROUP_DUP)
index++;
}
} else if (avail > max_avail)
max_avail = avail;
if (cur == dev_list)
@ -785,30 +1078,37 @@ again:
calc_size = max_avail;
goto again;
}
btrfs_free_path(path);
return -ENOSPC;
}
key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
key.type = BTRFS_CHUNK_ITEM_KEY;
ret = find_next_chunk(chunk_root, BTRFS_FIRST_CHUNK_TREE_OBJECTID,
&key.offset);
if (ret)
if (ret) {
btrfs_free_path(path);
return ret;
}
chunk = kmalloc(btrfs_chunk_item_size(num_stripes), GFP_NOFS);
if (!chunk)
if (!chunk) {
btrfs_free_path(path);
return -ENOMEM;
}
map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS);
if (!map) {
kfree(chunk);
btrfs_free_path(path);
return -ENOMEM;
}
btrfs_free_path(path);
path = NULL;
stripes = &chunk->stripe;
*num_bytes = chunk_bytes_by_type(type, calc_size,
num_stripes, sub_stripes);
index = 0;
printk("new chunk type %Lu start %Lu size %Lu\n", type, key.offset, *num_bytes);
while(index < num_stripes) {
@ -874,6 +1174,11 @@ printk("alloc chunk start %Lu size %Lu from dev %Lu type %Lu\n", key.offset, cal
em->len = *num_bytes;
em->block_start = 0;
if (type & BTRFS_BLOCK_GROUP_SYSTEM) {
ret = btrfs_add_system_chunk(trans, chunk_root, &key,
chunk, btrfs_chunk_item_size(num_stripes));
BUG_ON(ret);
}
kfree(chunk);
em_tree = &extent_root->fs_info->mapping_tree.map_tree;
@ -1376,11 +1681,6 @@ int btrfs_read_sys_array(struct btrfs_root *root)
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;

5
fs/btrfs/volumes.h
View File

@ -128,4 +128,9 @@ int btrfs_cleanup_fs_uuids(void);
int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
u64 logical, struct page *page);
int btrfs_grow_device(struct btrfs_trans_handle *trans,
struct btrfs_device *device, u64 new_size);
struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
u8 *uuid);
int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
#endif