Btrfs: Make the resizer work based on shrinking and growing devices
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index f00c4be..ac7106e 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -474,6 +474,7 @@
u64 pinned;
u64 flags;
int cached;
+ int ro;
};
struct btrfs_device;
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 7183826..a9ce491 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -818,6 +818,10 @@
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);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index c49592c..6540095 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -187,6 +187,7 @@
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 @@
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 @@
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 @@
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 @@
}
}
}
- 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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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));
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index b31f52d..4d12aa5 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -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 @@
{
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 @@
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 @@
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 @@
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 @@
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:
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index c63a982..a2c56de 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -77,7 +77,7 @@
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 @@
* 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 @@
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 @@
btrfs_free_path(path);
return ret;
}
+
int btrfs_update_device(struct btrfs_trans_handle *trans,
struct btrfs_device *device)
{
@@ -606,6 +638,254 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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;
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index a2660d2..6fe8440 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -128,4 +128,9 @@
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