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Btrfs: block group switching
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Signed-off-by: Chris Mason <chris.mason@oracle.com>
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Chris Mason authored and David Woodhouse committed May 29, 2007
1 parent 1de037a commit 1e2677e
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Showing 2 changed files with 65 additions and 25 deletions.
5 changes: 4 additions & 1 deletion fs/btrfs/ctree.h
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Original file line number Diff line number Diff line change
Expand Up @@ -249,10 +249,13 @@ struct btrfs_device_item {
/* tag for the radix tree of block groups in ram */
#define BTRFS_BLOCK_GROUP_DIRTY 0
#define BTRFS_BLOCK_GROUP_AVAIL 1
#define BTRFS_BLOCK_GROUP_HINTS 8
#define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)


#define BTRFS_BLOCK_GROUP_DATA 1
struct btrfs_block_group_item {
__le64 used;
u8 flags;
} __attribute__ ((__packed__));

struct btrfs_block_group_cache {
Expand Down
85 changes: 61 additions & 24 deletions fs/btrfs/extent-tree.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -232,21 +232,26 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
struct btrfs_block_group_cache *found_group = NULL;
struct btrfs_fs_info *info = root->fs_info;
struct radix_tree_root *radix;
struct radix_tree_root *swap_radix;
u64 used;
u64 last = 0;
u64 hint_last;
int i;
int ret;
int full_search = 0;
int factor = 8;
int data_swap = 0;

if (!owner)
factor = 5;

if (data)
if (data) {
radix = &info->block_group_data_radix;
else
swap_radix = &info->block_group_radix;
} else {
radix = &info->block_group_radix;
swap_radix = &info->block_group_data_radix;
}

if (search_start) {
struct btrfs_block_group_cache *shint;
Expand Down Expand Up @@ -334,15 +339,27 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
cond_resched();
}
if (!full_search) {
printk("find block group doing full search data %d start %Lu\n", data, search_start);
last = search_start;
full_search = 1;
goto again;
}
if (!data_swap) {
struct radix_tree_root *tmp = radix;
data_swap = 1;
radix = swap_radix;
swap_radix = tmp;
last = search_start;
goto again;
}
if (!found_group) {
printk("find block group bailing to zero data %d\n", data);
ret = radix_tree_gang_lookup(radix,
(void **)&found_group, 0, 1);
if (ret == 0) {
ret = radix_tree_gang_lookup(swap_radix,
(void **)&found_group,
0, 1);
}
BUG_ON(ret != 1);
}
found:
Expand Down Expand Up @@ -552,14 +569,16 @@ int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,

static int update_block_group(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 blocknr, u64 num, int alloc, int mark_free)
u64 blocknr, u64 num, int alloc, int mark_free,
int data)
{
struct btrfs_block_group_cache *cache;
struct btrfs_fs_info *info = root->fs_info;
u64 total = num;
u64 old_val;
u64 block_in_group;
u64 i;
int ret;

while(total) {
cache = lookup_block_group(info, blocknr);
Expand All @@ -577,7 +596,6 @@ static int update_block_group(struct btrfs_trans_handle *trans,
old_val = btrfs_block_group_used(&cache->item);
num = min(total, cache->key.offset - block_in_group);
if (alloc) {
old_val += num;
if (blocknr > cache->last_alloc)
cache->last_alloc = blocknr;
if (!cache->data) {
Expand All @@ -586,6 +604,30 @@ static int update_block_group(struct btrfs_trans_handle *trans,
blocknr + i);
}
}
if (cache->data != data &&
old_val < cache->key.offset / 2) {
printk("changing block group %Lu from %d to %d\n", cache->key.objectid, cache->data, data);
cache->data = data;
radix_tree_delete(cache->radix,
cache->key.objectid +
cache->key.offset - 1);

if (data) {
cache->radix =
&info->block_group_data_radix;
cache->item.flags |=
BTRFS_BLOCK_GROUP_DATA;
} else {
cache->radix = &info->block_group_radix;
cache->item.flags &=
~BTRFS_BLOCK_GROUP_DATA;
}
ret = radix_tree_insert(cache->radix,
cache->key.objectid +
cache->key.offset - 1,
(void *)cache);
}
old_val += num;
} else {
old_val -= num;
if (blocknr < cache->first_free)
Expand All @@ -596,8 +638,8 @@ static int update_block_group(struct btrfs_trans_handle *trans,
blocknr + i);
}
}
if (old_val < (cache->key.offset * 5) / 10 &&
old_val + num >= (cache->key.offset * 5) / 10) {
if (old_val < cache->key.offset / 2 &&
old_val + num >= cache->key.offset / 2) {
printk("group %Lu now available\n", cache->key.objectid);
radix_tree_tag_set(cache->radix,
cache->key.objectid +
Expand Down Expand Up @@ -779,7 +821,7 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
if (ret)
BUG();
ret = update_block_group(trans, root, blocknr, num_blocks, 0,
mark_free);
mark_free, 0);
BUG_ON(ret);
}
btrfs_free_path(path);
Expand Down Expand Up @@ -909,10 +951,7 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
}

check_failed:
if (!full_scan && block_group->data != data)
WARN_ON(1);

if (!data)
if (!block_group->data)
search_start = find_search_start(root, &block_group,
search_start, total_needed);
else
Expand Down Expand Up @@ -1142,7 +1181,7 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
info->extent_tree_insert[info->extent_tree_insert_nr++] =
ins->objectid;
ret = update_block_group(trans, root,
ins->objectid, ins->offset, 1, 0);
ins->objectid, ins->offset, 1, 0, 0);
BUG_ON(ret);
return 0;
}
Expand Down Expand Up @@ -1208,7 +1247,8 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
if (pending_ret) {
return pending_ret;
}
ret = update_block_group(trans, root, ins->objectid, ins->offset, 1, 0);
ret = update_block_group(trans, root, ins->objectid, ins->offset, 1, 0,
data);
return 0;
}

Expand Down Expand Up @@ -1477,7 +1517,6 @@ int btrfs_read_block_groups(struct btrfs_root *root)
struct btrfs_leaf *leaf;
u64 group_size_blocks = BTRFS_BLOCK_GROUP_SIZE / root->blocksize;
u64 used;
u64 nr = 0;

root = info->extent_root;
key.objectid = 0;
Expand Down Expand Up @@ -1505,13 +1544,16 @@ int btrfs_read_block_groups(struct btrfs_root *root)
break;
}

if (nr % 3)
bi = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_block_group_item);
if (bi->flags & BTRFS_BLOCK_GROUP_DATA) {
radix = &info->block_group_data_radix;
else
cache->data = 1;
} else {
radix = &info->block_group_radix;
cache->data = 0;
}

bi = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_block_group_item);
memcpy(&cache->item, bi, sizeof(*bi));
memcpy(&cache->key, &found_key, sizeof(found_key));
cache->last_alloc = cache->key.objectid;
Expand All @@ -1520,10 +1562,6 @@ int btrfs_read_block_groups(struct btrfs_root *root)
cache->pinned = 0;
cache->cached = 0;

if (nr % 3)
cache->data = 1;
else
cache->data = 0;
cache->radix = radix;

key.objectid = found_key.objectid + found_key.offset;
Expand All @@ -1541,7 +1579,6 @@ int btrfs_read_block_groups(struct btrfs_root *root)
if (key.objectid >=
btrfs_super_total_blocks(info->disk_super))
break;
nr++;
}

btrfs_free_path(path);
Expand Down

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