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Btrfs: block group switching 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-05-29 16:52:18 -04:00 committed by David Woodhouse
parent 1de037a43e
commit 1e2677e000
2 changed files with 66 additions and 26 deletions
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5
fs/btrfs/ctree.h
View File

@ -249,10 +249,13 @@ struct btrfs_device_item {
/* tag for the radix tree of block groups in ram */ /* tag for the radix tree of block groups in ram */
#define BTRFS_BLOCK_GROUP_DIRTY 0 #define BTRFS_BLOCK_GROUP_DIRTY 0
#define BTRFS_BLOCK_GROUP_AVAIL 1 #define BTRFS_BLOCK_GROUP_AVAIL 1
#define BTRFS_BLOCK_GROUP_HINTS 8
#define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024) #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
#define BTRFS_BLOCK_GROUP_DATA 1
struct btrfs_block_group_item { struct btrfs_block_group_item {
__le64 used; __le64 used;
u8 flags;
} __attribute__ ((__packed__)); } __attribute__ ((__packed__));
struct btrfs_block_group_cache { struct btrfs_block_group_cache {

87
fs/btrfs/extent-tree.c
View File

@ -232,6 +232,7 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
struct btrfs_block_group_cache *found_group = NULL; struct btrfs_block_group_cache *found_group = NULL;
struct btrfs_fs_info *info = root->fs_info; struct btrfs_fs_info *info = root->fs_info;
struct radix_tree_root *radix; struct radix_tree_root *radix;
struct radix_tree_root *swap_radix;
u64 used; u64 used;
u64 last = 0; u64 last = 0;
u64 hint_last; u64 hint_last;
@ -239,14 +240,18 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
int ret; int ret;
int full_search = 0; int full_search = 0;
int factor = 8; int factor = 8;
int data_swap = 0;
if (!owner) if (!owner)
factor = 5; factor = 5;
if (data) if (data) {
radix = &info->block_group_data_radix; radix = &info->block_group_data_radix;
else swap_radix = &info->block_group_radix;
} else {
radix = &info->block_group_radix; radix = &info->block_group_radix;
swap_radix = &info->block_group_data_radix;
}
if (search_start) { if (search_start) {
struct btrfs_block_group_cache *shint; struct btrfs_block_group_cache *shint;
@ -334,15 +339,27 @@ again:
cond_resched(); cond_resched();
} }
if (!full_search) { if (!full_search) {
printk("find block group doing full search data %d start %Lu\n", data, search_start);
last = search_start; last = search_start;
full_search = 1; full_search = 1;
goto again; 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) { if (!found_group) {
printk("find block group bailing to zero data %d\n", data); printk("find block group bailing to zero data %d\n", data);
ret = radix_tree_gang_lookup(radix, ret = radix_tree_gang_lookup(radix,
(void **)&found_group, 0, 1); (void **)&found_group, 0, 1);
if (ret == 0) {
ret = radix_tree_gang_lookup(swap_radix,
(void **)&found_group,
0, 1);
}
BUG_ON(ret != 1); BUG_ON(ret != 1);
} }
found: found:
@ -552,7 +569,8 @@ int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
static int update_block_group(struct btrfs_trans_handle *trans, static int update_block_group(struct btrfs_trans_handle *trans,
struct btrfs_root *root, 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_block_group_cache *cache;
struct btrfs_fs_info *info = root->fs_info; struct btrfs_fs_info *info = root->fs_info;
@ -560,6 +578,7 @@ static int update_block_group(struct btrfs_trans_handle *trans,
u64 old_val; u64 old_val;
u64 block_in_group; u64 block_in_group;
u64 i; u64 i;
int ret;
while(total) { while(total) {
cache = lookup_block_group(info, blocknr); cache = lookup_block_group(info, blocknr);
@ -577,7 +596,6 @@ static int update_block_group(struct btrfs_trans_handle *trans,
old_val = btrfs_block_group_used(&cache->item); old_val = btrfs_block_group_used(&cache->item);
num = min(total, cache->key.offset - block_in_group); num = min(total, cache->key.offset - block_in_group);
if (alloc) { if (alloc) {
old_val += num;
if (blocknr > cache->last_alloc) if (blocknr > cache->last_alloc)
cache->last_alloc = blocknr; cache->last_alloc = blocknr;
if (!cache->data) { if (!cache->data) {
@ -586,6 +604,30 @@ static int update_block_group(struct btrfs_trans_handle *trans,
blocknr + i); 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 { } else {
old_val -= num; old_val -= num;
if (blocknr < cache->first_free) if (blocknr < cache->first_free)
@ -596,8 +638,8 @@ static int update_block_group(struct btrfs_trans_handle *trans,
blocknr + i); blocknr + i);
} }
} }
if (old_val < (cache->key.offset * 5) / 10 && if (old_val < cache->key.offset / 2 &&
old_val + num >= (cache->key.offset * 5) / 10) { old_val + num >= cache->key.offset / 2) {
printk("group %Lu now available\n", cache->key.objectid); printk("group %Lu now available\n", cache->key.objectid);
radix_tree_tag_set(cache->radix, radix_tree_tag_set(cache->radix,
cache->key.objectid + cache->key.objectid +
@ -779,7 +821,7 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
if (ret) if (ret)
BUG(); BUG();
ret = update_block_group(trans, root, blocknr, num_blocks, 0, ret = update_block_group(trans, root, blocknr, num_blocks, 0,
mark_free); mark_free, 0);
BUG_ON(ret); BUG_ON(ret);
} }
btrfs_free_path(path); btrfs_free_path(path);
@ -909,10 +951,7 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
} }
check_failed: check_failed:
if (!full_scan && block_group->data != data) if (!block_group->data)
WARN_ON(1);
if (!data)
search_start = find_search_start(root, &block_group, search_start = find_search_start(root, &block_group,
search_start, total_needed); search_start, total_needed);
else else
@ -1142,7 +1181,7 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
info->extent_tree_insert[info->extent_tree_insert_nr++] = info->extent_tree_insert[info->extent_tree_insert_nr++] =
ins->objectid; ins->objectid;
ret = update_block_group(trans, root, ret = update_block_group(trans, root,
ins->objectid, ins->offset, 1, 0); ins->objectid, ins->offset, 1, 0, 0);
BUG_ON(ret); BUG_ON(ret);
return 0; return 0;
} }
@ -1208,7 +1247,8 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
if (pending_ret) { if (pending_ret) {
return 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; return 0;
} }
@ -1477,7 +1517,6 @@ int btrfs_read_block_groups(struct btrfs_root *root)
struct btrfs_leaf *leaf; struct btrfs_leaf *leaf;
u64 group_size_blocks = BTRFS_BLOCK_GROUP_SIZE / root->blocksize; u64 group_size_blocks = BTRFS_BLOCK_GROUP_SIZE / root->blocksize;
u64 used; u64 used;
u64 nr = 0;
root = info->extent_root; root = info->extent_root;
key.objectid = 0; key.objectid = 0;
@ -1505,13 +1544,16 @@ int btrfs_read_block_groups(struct btrfs_root *root)
break; break;
} }
if (nr % 3)
radix = &info->block_group_data_radix;
else
radix = &info->block_group_radix;
bi = btrfs_item_ptr(leaf, path->slots[0], bi = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_block_group_item); struct btrfs_block_group_item);
if (bi->flags & BTRFS_BLOCK_GROUP_DATA) {
radix = &info->block_group_data_radix;
cache->data = 1;
} else {
radix = &info->block_group_radix;
cache->data = 0;
}
memcpy(&cache->item, bi, sizeof(*bi)); memcpy(&cache->item, bi, sizeof(*bi));
memcpy(&cache->key, &found_key, sizeof(found_key)); memcpy(&cache->key, &found_key, sizeof(found_key));
cache->last_alloc = cache->key.objectid; cache->last_alloc = cache->key.objectid;
@ -1520,10 +1562,6 @@ int btrfs_read_block_groups(struct btrfs_root *root)
cache->pinned = 0; cache->pinned = 0;
cache->cached = 0; cache->cached = 0;
if (nr % 3)
cache->data = 1;
else
cache->data = 0;
cache->radix = radix; cache->radix = radix;
key.objectid = found_key.objectid + found_key.offset; key.objectid = found_key.objectid + found_key.offset;
@ -1541,7 +1579,6 @@ int btrfs_read_block_groups(struct btrfs_root *root)
if (key.objectid >= if (key.objectid >=
btrfs_super_total_blocks(info->disk_super)) btrfs_super_total_blocks(info->disk_super))
break; break;
nr++;
} }
btrfs_free_path(path); btrfs_free_path(path);