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path: root/fs/btrfs/free-space-cache.c
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Diffstat (limited to 'fs/btrfs/free-space-cache.c')
-rw-r--r--fs/btrfs/free-space-cache.c993
1 files changed, 603 insertions, 390 deletions
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 63731a1fb0a1..70d45795d758 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -25,18 +25,17 @@
#include "transaction.h"
#include "disk-io.h"
#include "extent_io.h"
+#include "inode-map.h"
#define BITS_PER_BITMAP (PAGE_CACHE_SIZE * 8)
#define MAX_CACHE_BYTES_PER_GIG (32 * 1024)
-static void recalculate_thresholds(struct btrfs_block_group_cache
- *block_group);
-static int link_free_space(struct btrfs_block_group_cache *block_group,
+static int link_free_space(struct btrfs_free_space_ctl *ctl,
struct btrfs_free_space *info);
-struct inode *lookup_free_space_inode(struct btrfs_root *root,
- struct btrfs_block_group_cache
- *block_group, struct btrfs_path *path)
+static struct inode *__lookup_free_space_inode(struct btrfs_root *root,
+ struct btrfs_path *path,
+ u64 offset)
{
struct btrfs_key key;
struct btrfs_key location;
@@ -46,22 +45,15 @@ struct inode *lookup_free_space_inode(struct btrfs_root *root,
struct inode *inode = NULL;
int ret;
- spin_lock(&block_group->lock);
- if (block_group->inode)
- inode = igrab(block_group->inode);
- spin_unlock(&block_group->lock);
- if (inode)
- return inode;
-
key.objectid = BTRFS_FREE_SPACE_OBJECTID;
- key.offset = block_group->key.objectid;
+ key.offset = offset;
key.type = 0;
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
return ERR_PTR(ret);
if (ret > 0) {
- btrfs_release_path(root, path);
+ btrfs_release_path(path);
return ERR_PTR(-ENOENT);
}
@@ -70,7 +62,7 @@ struct inode *lookup_free_space_inode(struct btrfs_root *root,
struct btrfs_free_space_header);
btrfs_free_space_key(leaf, header, &disk_key);
btrfs_disk_key_to_cpu(&location, &disk_key);
- btrfs_release_path(root, path);
+ btrfs_release_path(path);
inode = btrfs_iget(root->fs_info->sb, &location, root, NULL);
if (!inode)
@@ -84,6 +76,27 @@ struct inode *lookup_free_space_inode(struct btrfs_root *root,
inode->i_mapping->flags &= ~__GFP_FS;
+ return inode;
+}
+
+struct inode *lookup_free_space_inode(struct btrfs_root *root,
+ struct btrfs_block_group_cache
+ *block_group, struct btrfs_path *path)
+{
+ struct inode *inode = NULL;
+
+ spin_lock(&block_group->lock);
+ if (block_group->inode)
+ inode = igrab(block_group->inode);
+ spin_unlock(&block_group->lock);
+ if (inode)
+ return inode;
+
+ inode = __lookup_free_space_inode(root, path,
+ block_group->key.objectid);
+ if (IS_ERR(inode))
+ return inode;
+
spin_lock(&block_group->lock);
if (!root->fs_info->closing) {
block_group->inode = igrab(inode);
@@ -94,24 +107,18 @@ struct inode *lookup_free_space_inode(struct btrfs_root *root,
return inode;
}
-int create_free_space_inode(struct btrfs_root *root,
- struct btrfs_trans_handle *trans,
- struct btrfs_block_group_cache *block_group,
- struct btrfs_path *path)
+int __create_free_space_inode(struct btrfs_root *root,
+ struct btrfs_trans_handle *trans,
+ struct btrfs_path *path, u64 ino, u64 offset)
{
struct btrfs_key key;
struct btrfs_disk_key disk_key;
struct btrfs_free_space_header *header;
struct btrfs_inode_item *inode_item;
struct extent_buffer *leaf;
- u64 objectid;
int ret;
- ret = btrfs_find_free_objectid(trans, root, 0, &objectid);
- if (ret < 0)
- return ret;
-
- ret = btrfs_insert_empty_inode(trans, root, path, objectid);
+ ret = btrfs_insert_empty_inode(trans, root, path, ino);
if (ret)
return ret;
@@ -131,19 +138,18 @@ int create_free_space_inode(struct btrfs_root *root,
BTRFS_INODE_PREALLOC | BTRFS_INODE_NODATASUM);
btrfs_set_inode_nlink(leaf, inode_item, 1);
btrfs_set_inode_transid(leaf, inode_item, trans->transid);
- btrfs_set_inode_block_group(leaf, inode_item,
- block_group->key.objectid);
+ btrfs_set_inode_block_group(leaf, inode_item, offset);
btrfs_mark_buffer_dirty(leaf);
- btrfs_release_path(root, path);
+ btrfs_release_path(path);
key.objectid = BTRFS_FREE_SPACE_OBJECTID;
- key.offset = block_group->key.objectid;
+ key.offset = offset;
key.type = 0;
ret = btrfs_insert_empty_item(trans, root, path, &key,
sizeof(struct btrfs_free_space_header));
if (ret < 0) {
- btrfs_release_path(root, path);
+ btrfs_release_path(path);
return ret;
}
leaf = path->nodes[0];
@@ -152,11 +158,27 @@ int create_free_space_inode(struct btrfs_root *root,
memset_extent_buffer(leaf, 0, (unsigned long)header, sizeof(*header));
btrfs_set_free_space_key(leaf, header, &disk_key);
btrfs_mark_buffer_dirty(leaf);
- btrfs_release_path(root, path);
+ btrfs_release_path(path);
return 0;
}
+int create_free_space_inode(struct btrfs_root *root,
+ struct btrfs_trans_handle *trans,
+ struct btrfs_block_group_cache *block_group,
+ struct btrfs_path *path)
+{
+ int ret;
+ u64 ino;
+
+ ret = btrfs_find_free_objectid(root, &ino);
+ if (ret < 0)
+ return ret;
+
+ return __create_free_space_inode(root, trans, path, ino,
+ block_group->key.objectid);
+}
+
int btrfs_truncate_free_space_cache(struct btrfs_root *root,
struct btrfs_trans_handle *trans,
struct btrfs_path *path,
@@ -187,7 +209,8 @@ int btrfs_truncate_free_space_cache(struct btrfs_root *root,
return ret;
}
- return btrfs_update_inode(trans, root, inode);
+ ret = btrfs_update_inode(trans, root, inode);
+ return ret;
}
static int readahead_cache(struct inode *inode)
@@ -209,15 +232,13 @@ static int readahead_cache(struct inode *inode)
return 0;
}
-int load_free_space_cache(struct btrfs_fs_info *fs_info,
- struct btrfs_block_group_cache *block_group)
+int __load_free_space_cache(struct btrfs_root *root, struct inode *inode,
+ struct btrfs_free_space_ctl *ctl,
+ struct btrfs_path *path, u64 offset)
{
- struct btrfs_root *root = fs_info->tree_root;
- struct inode *inode;
struct btrfs_free_space_header *header;
struct extent_buffer *leaf;
struct page *page;
- struct btrfs_path *path;
u32 *checksums = NULL, *crc;
char *disk_crcs = NULL;
struct btrfs_key key;
@@ -225,76 +246,47 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
u64 num_entries;
u64 num_bitmaps;
u64 generation;
- u64 used = btrfs_block_group_used(&block_group->item);
u32 cur_crc = ~(u32)0;
pgoff_t index = 0;
unsigned long first_page_offset;
int num_checksums;
- int ret = 0;
-
- /*
- * If we're unmounting then just return, since this does a search on the
- * normal root and not the commit root and we could deadlock.
- */
- smp_mb();
- if (fs_info->closing)
- return 0;
-
- /*
- * If this block group has been marked to be cleared for one reason or
- * another then we can't trust the on disk cache, so just return.
- */
- spin_lock(&block_group->lock);
- if (block_group->disk_cache_state != BTRFS_DC_WRITTEN) {
- spin_unlock(&block_group->lock);
- return 0;
- }
- spin_unlock(&block_group->lock);
+ int ret = 0, ret2;
INIT_LIST_HEAD(&bitmaps);
- path = btrfs_alloc_path();
- if (!path)
- return 0;
-
- inode = lookup_free_space_inode(root, block_group, path);
- if (IS_ERR(inode)) {
- btrfs_free_path(path);
- return 0;
- }
-
/* Nothing in the space cache, goodbye */
- if (!i_size_read(inode)) {
- btrfs_free_path(path);
+ if (!i_size_read(inode))
goto out;
- }
key.objectid = BTRFS_FREE_SPACE_OBJECTID;
- key.offset = block_group->key.objectid;
+ key.offset = offset;
key.type = 0;
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
- if (ret) {
- btrfs_free_path(path);
+ if (ret < 0)
+ goto out;
+ else if (ret > 0) {
+ btrfs_release_path(path);
+ ret = 0;
goto out;
}
+ ret = -1;
+
leaf = path->nodes[0];
header = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_free_space_header);
num_entries = btrfs_free_space_entries(leaf, header);
num_bitmaps = btrfs_free_space_bitmaps(leaf, header);
generation = btrfs_free_space_generation(leaf, header);
- btrfs_free_path(path);
+ btrfs_release_path(path);
if (BTRFS_I(inode)->generation != generation) {
printk(KERN_ERR "btrfs: free space inode generation (%llu) did"
- " not match free space cache generation (%llu) for "
- "block group %llu\n",
+ " not match free space cache generation (%llu)\n",
(unsigned long long)BTRFS_I(inode)->generation,
- (unsigned long long)generation,
- (unsigned long long)block_group->key.objectid);
- goto free_cache;
+ (unsigned long long)generation);
+ goto out;
}
if (!num_entries)
@@ -311,10 +303,8 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
goto out;
ret = readahead_cache(inode);
- if (ret) {
- ret = 0;
+ if (ret)
goto out;
- }
while (1) {
struct btrfs_free_space_entry *entry;
@@ -333,10 +323,8 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
}
page = grab_cache_page(inode->i_mapping, index);
- if (!page) {
- ret = 0;
+ if (!page)
goto free_cache;
- }
if (!PageUptodate(page)) {
btrfs_readpage(NULL, page);
@@ -345,9 +333,7 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
unlock_page(page);
page_cache_release(page);
printk(KERN_ERR "btrfs: error reading free "
- "space cache: %llu\n",
- (unsigned long long)
- block_group->key.objectid);
+ "space cache\n");
goto free_cache;
}
}
@@ -360,13 +346,10 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
gen = addr + (sizeof(u32) * num_checksums);
if (*gen != BTRFS_I(inode)->generation) {
printk(KERN_ERR "btrfs: space cache generation"
- " (%llu) does not match inode (%llu) "
- "for block group %llu\n",
+ " (%llu) does not match inode (%llu)\n",
(unsigned long long)*gen,
(unsigned long long)
- BTRFS_I(inode)->generation,
- (unsigned long long)
- block_group->key.objectid);
+ BTRFS_I(inode)->generation);
kunmap(page);
unlock_page(page);
page_cache_release(page);
@@ -382,9 +365,8 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
PAGE_CACHE_SIZE - start_offset);
btrfs_csum_final(cur_crc, (char *)&cur_crc);
if (cur_crc != *crc) {
- printk(KERN_ERR "btrfs: crc mismatch for page %lu in "
- "block group %llu\n", index,
- (unsigned long long)block_group->key.objectid);
+ printk(KERN_ERR "btrfs: crc mismatch for page %lu\n",
+ index);
kunmap(page);
unlock_page(page);
page_cache_release(page);
@@ -417,9 +399,9 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
}
if (entry->type == BTRFS_FREE_SPACE_EXTENT) {
- spin_lock(&block_group->tree_lock);
- ret = link_free_space(block_group, e);
- spin_unlock(&block_group->tree_lock);
+ spin_lock(&ctl->tree_lock);
+ ret = link_free_space(ctl, e);
+ spin_unlock(&ctl->tree_lock);
BUG_ON(ret);
} else {
e->bitmap = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS);
@@ -431,11 +413,11 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
page_cache_release(page);
goto free_cache;
}
- spin_lock(&block_group->tree_lock);
- ret = link_free_space(block_group, e);
- block_group->total_bitmaps++;
- recalculate_thresholds(block_group);
- spin_unlock(&block_group->tree_lock);
+ spin_lock(&ctl->tree_lock);
+ ret2 = link_free_space(ctl, e);
+ ctl->total_bitmaps++;
+ ctl->op->recalc_thresholds(ctl);
+ spin_unlock(&ctl->tree_lock);
list_add_tail(&e->list, &bitmaps);
}
@@ -471,41 +453,97 @@ next:
index++;
}
- spin_lock(&block_group->tree_lock);
- if (block_group->free_space != (block_group->key.offset - used -
- block_group->bytes_super)) {
- spin_unlock(&block_group->tree_lock);
- printk(KERN_ERR "block group %llu has an wrong amount of free "
- "space\n", block_group->key.objectid);
- ret = 0;
- goto free_cache;
- }
- spin_unlock(&block_group->tree_lock);
-
ret = 1;
out:
kfree(checksums);
kfree(disk_crcs);
- iput(inode);
return ret;
-
free_cache:
- /* This cache is bogus, make sure it gets cleared */
+ __btrfs_remove_free_space_cache(ctl);
+ goto out;
+}
+
+int load_free_space_cache(struct btrfs_fs_info *fs_info,
+ struct btrfs_block_group_cache *block_group)
+{
+ struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
+ struct btrfs_root *root = fs_info->tree_root;
+ struct inode *inode;
+ struct btrfs_path *path;
+ int ret;
+ bool matched;
+ u64 used = btrfs_block_group_used(&block_group->item);
+
+ /*
+ * If we're unmounting then just return, since this does a search on the
+ * normal root and not the commit root and we could deadlock.
+ */
+ smp_mb();
+ if (fs_info->closing)
+ return 0;
+
+ /*
+ * If this block group has been marked to be cleared for one reason or
+ * another then we can't trust the on disk cache, so just return.
+ */
spin_lock(&block_group->lock);
- block_group->disk_cache_state = BTRFS_DC_CLEAR;
+ if (block_group->disk_cache_state != BTRFS_DC_WRITTEN) {
+ spin_unlock(&block_group->lock);
+ return 0;
+ }
spin_unlock(&block_group->lock);
- btrfs_remove_free_space_cache(block_group);
- goto out;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return 0;
+
+ inode = lookup_free_space_inode(root, block_group, path);
+ if (IS_ERR(inode)) {
+ btrfs_free_path(path);
+ return 0;
+ }
+
+ ret = __load_free_space_cache(fs_info->tree_root, inode, ctl,
+ path, block_group->key.objectid);
+ btrfs_free_path(path);
+ if (ret <= 0)
+ goto out;
+
+ spin_lock(&ctl->tree_lock);
+ matched = (ctl->free_space == (block_group->key.offset - used -
+ block_group->bytes_super));
+ spin_unlock(&ctl->tree_lock);
+
+ if (!matched) {
+ __btrfs_remove_free_space_cache(ctl);
+ printk(KERN_ERR "block group %llu has an wrong amount of free "
+ "space\n", block_group->key.objectid);
+ ret = -1;
+ }
+out:
+ if (ret < 0) {
+ /* This cache is bogus, make sure it gets cleared */
+ spin_lock(&block_group->lock);
+ block_group->disk_cache_state = BTRFS_DC_CLEAR;
+ spin_unlock(&block_group->lock);
+ ret = 0;
+
+ printk(KERN_ERR "btrfs: failed to load free space cache "
+ "for block group %llu\n", block_group->key.objectid);
+ }
+
+ iput(inode);
+ return ret;
}
-int btrfs_write_out_cache(struct btrfs_root *root,
- struct btrfs_trans_handle *trans,
- struct btrfs_block_group_cache *block_group,
- struct btrfs_path *path)
+int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode,
+ struct btrfs_free_space_ctl *ctl,
+ struct btrfs_block_group_cache *block_group,
+ struct btrfs_trans_handle *trans,
+ struct btrfs_path *path, u64 offset)
{
struct btrfs_free_space_header *header;
struct extent_buffer *leaf;
- struct inode *inode;
struct rb_node *node;
struct list_head *pos, *n;
struct page **pages;
@@ -522,35 +560,18 @@ int btrfs_write_out_cache(struct btrfs_root *root,
int index = 0, num_pages = 0;
int entries = 0;
int bitmaps = 0;
- int ret = 0;
+ int ret = -1;
bool next_page = false;
bool out_of_space = false;
- root = root->fs_info->tree_root;
-
INIT_LIST_HEAD(&bitmap_list);
- spin_lock(&block_group->lock);
- if (block_group->disk_cache_state < BTRFS_DC_SETUP) {
- spin_unlock(&block_group->lock);
- return 0;
- }
- spin_unlock(&block_group->lock);
-
- inode = lookup_free_space_inode(root, block_group, path);
- if (IS_ERR(inode))
- return 0;
-
- if (!i_size_read(inode)) {
- iput(inode);
+ node = rb_first(&ctl->free_space_offset);
+ if (!node)
return 0;
- }
- node = rb_first(&block_group->free_space_offset);
- if (!node) {
- iput(inode);
- return 0;
- }
+ if (!i_size_read(inode))
+ return -1;
num_pages = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
PAGE_CACHE_SHIFT;
@@ -560,16 +581,13 @@ int btrfs_write_out_cache(struct btrfs_root *root,
/* We need a checksum per page. */
crc = checksums = kzalloc(sizeof(u32) * num_pages, GFP_NOFS);
- if (!crc) {
- iput(inode);
- return 0;
- }
+ if (!crc)
+ return -1;
pages = kzalloc(sizeof(struct page *) * num_pages, GFP_NOFS);
if (!pages) {
kfree(crc);
- iput(inode);
- return 0;
+ return -1;
}
/* Since the first page has all of our checksums and our generation we
@@ -579,7 +597,7 @@ int btrfs_write_out_cache(struct btrfs_root *root,
first_page_offset = (sizeof(u32) * num_pages) + sizeof(u64);
/* Get the cluster for this block_group if it exists */
- if (!list_empty(&block_group->cluster_list))
+ if (block_group && !list_empty(&block_group->cluster_list))
cluster = list_entry(block_group->cluster_list.next,
struct btrfs_free_cluster,
block_group_list);
@@ -621,7 +639,8 @@ int btrfs_write_out_cache(struct btrfs_root *root,
* When searching for pinned extents, we need to start at our start
* offset.
*/
- start = block_group->key.objectid;
+ if (block_group)
+ start = block_group->key.objectid;
/* Write out the extent entries */
do {
@@ -679,8 +698,9 @@ int btrfs_write_out_cache(struct btrfs_root *root,
* We want to add any pinned extents to our free space cache
* so we don't leak the space
*/
- while (!next_page && (start < block_group->key.objectid +
- block_group->key.offset)) {
+ while (block_group && !next_page &&
+ (start < block_group->key.objectid +
+ block_group->key.offset)) {
ret = find_first_extent_bit(unpin, start, &start, &end,
EXTENT_DIRTY);
if (ret) {
@@ -798,12 +818,12 @@ int btrfs_write_out_cache(struct btrfs_root *root,
filemap_write_and_wait(inode->i_mapping);
key.objectid = BTRFS_FREE_SPACE_OBJECTID;
- key.offset = block_group->key.objectid;
+ key.offset = offset;
key.type = 0;
ret = btrfs_search_slot(trans, root, &key, path, 1, 1);
if (ret < 0) {
- ret = 0;
+ ret = -1;
clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, bytes - 1,
EXTENT_DIRTY | EXTENT_DELALLOC |
EXTENT_DO_ACCOUNTING, 0, 0, NULL, GFP_NOFS);
@@ -816,13 +836,13 @@ int btrfs_write_out_cache(struct btrfs_root *root,
path->slots[0]--;
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
if (found_key.objectid != BTRFS_FREE_SPACE_OBJECTID ||
- found_key.offset != block_group->key.objectid) {
- ret = 0;
+ found_key.offset != offset) {
+ ret = -1;
clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, bytes - 1,
EXTENT_DIRTY | EXTENT_DELALLOC |
EXTENT_DO_ACCOUNTING, 0, 0, NULL,
GFP_NOFS);
- btrfs_release_path(root, path);
+ btrfs_release_path(path);
goto out_free;
}
}
@@ -832,49 +852,83 @@ int btrfs_write_out_cache(struct btrfs_root *root,
btrfs_set_free_space_bitmaps(leaf, header, bitmaps);
btrfs_set_free_space_generation(leaf, header, trans->transid);
btrfs_mark_buffer_dirty(leaf);
- btrfs_release_path(root, path);
+ btrfs_release_path(path);
ret = 1;
out_free:
- if (ret == 0) {
+ if (ret != 1) {
invalidate_inode_pages2_range(inode->i_mapping, 0, index);
- spin_lock(&block_group->lock);
- block_group->disk_cache_state = BTRFS_DC_ERROR;
- spin_unlock(&block_group->lock);
BTRFS_I(inode)->generation = 0;
}
kfree(checksums);
kfree(pages);
btrfs_update_inode(trans, root, inode);
+ return ret;
+}
+
+int btrfs_write_out_cache(struct btrfs_root *root,
+ struct btrfs_trans_handle *trans,
+ struct btrfs_block_group_cache *block_group,
+ struct btrfs_path *path)
+{
+ struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
+ struct inode *inode;
+ int ret = 0;
+
+ root = root->fs_info->tree_root;
+
+ spin_lock(&block_group->lock);
+ if (block_group->disk_cache_state < BTRFS_DC_SETUP) {
+ spin_unlock(&block_group->lock);
+ return 0;
+ }
+ spin_unlock(&block_group->lock);
+
+ inode = lookup_free_space_inode(root, block_group, path);
+ if (IS_ERR(inode))
+ return 0;
+
+ ret = __btrfs_write_out_cache(root, inode, ctl, block_group, trans,
+ path, block_group->key.objectid);
+ if (ret < 0) {
+ spin_lock(&block_group->lock);
+ block_group->disk_cache_state = BTRFS_DC_ERROR;
+ spin_unlock(&block_group->lock);
+ ret = 0;
+
+ printk(KERN_ERR "btrfs: failed to write free space cace "
+ "for block group %llu\n", block_group->key.objectid);
+ }
+
iput(inode);
return ret;
}
-static inline unsigned long offset_to_bit(u64 bitmap_start, u64 sectorsize,
+static inline unsigned long offset_to_bit(u64 bitmap_start, u32 unit,
u64 offset)
{
BUG_ON(offset < bitmap_start);
offset -= bitmap_start;
- return (unsigned long)(div64_u64(offset, sectorsize));
+ return (unsigned long)(div_u64(offset, unit));
}
-static inline unsigned long bytes_to_bits(u64 bytes, u64 sectorsize)
+static inline unsigned long bytes_to_bits(u64 bytes, u32 unit)
{
- return (unsigned long)(div64_u64(bytes, sectorsize));
+ return (unsigned long)(div_u64(bytes, unit));
}
-static inline u64 offset_to_bitmap(struct btrfs_block_group_cache *block_group,
+static inline u64 offset_to_bitmap(struct btrfs_free_space_ctl *ctl,
u64 offset)
{
u64 bitmap_start;
u64 bytes_per_bitmap;
- bytes_per_bitmap = BITS_PER_BITMAP * block_group->sectorsize;
- bitmap_start = offset - block_group->key.objectid;
+ bytes_per_bitmap = BITS_PER_BITMAP * ctl->unit;
+ bitmap_start = offset - ctl->start;
bitmap_start = div64_u64(bitmap_start, bytes_per_bitmap);
bitmap_start *= bytes_per_bitmap;
- bitmap_start += block_group->key.objectid;
+ bitmap_start += ctl->start;
return bitmap_start;
}
@@ -932,10 +986,10 @@ static int tree_insert_offset(struct rb_root *root, u64 offset,
* offset.
*/
static struct btrfs_free_space *
-tree_search_offset(struct btrfs_block_group_cache *block_group,
+tree_search_offset(struct btrfs_free_space_ctl *ctl,
u64 offset, int bitmap_only, int fuzzy)
{
- struct rb_node *n = block_group->free_space_offset.rb_node;
+ struct rb_node *n = ctl->free_space_offset.rb_node;
struct btrfs_free_space *entry, *prev = NULL;
/* find entry that is closest to the 'offset' */
@@ -1031,8 +1085,7 @@ tree_search_offset(struct btrfs_block_group_cache *block_group,
break;
}
}
- if (entry->offset + BITS_PER_BITMAP *
- block_group->sectorsize > offset)
+ if (entry->offset + BITS_PER_BITMAP * ctl->unit > offset)
return entry;
} else if (entry->offset + entry->bytes > offset)
return entry;
@@ -1043,7 +1096,7 @@ tree_search_offset(struct btrfs_block_group_cache *block_group,
while (1) {
if (entry->bitmap) {
if (entry->offset + BITS_PER_BITMAP *
- block_group->sectorsize > offset)
+ ctl->unit > offset)
break;
} else {
if (entry->offset + entry->bytes > offset)
@@ -1059,42 +1112,47 @@ tree_search_offset(struct btrfs_block_group_cache *block_group,
}
static inline void
-__unlink_free_space(struct btrfs_block_group_cache *block_group,
+__unlink_free_space(struct btrfs_free_space_ctl *ctl,
struct btrfs_free_space *info)
{
- rb_erase(&info->offset_index, &block_group->free_space_offset);
- block_group->free_extents--;
+ rb_erase(&info->offset_index, &ctl->free_space_offset);
+ ctl->free_extents--;
}
-static void unlink_free_space(struct btrfs_block_group_cache *block_group,
+static void unlink_free_space(struct btrfs_free_space_ctl *ctl,
struct btrfs_free_space *info)
{
- __unlink_free_space(block_group, info);
- block_group->free_space -= info->bytes;
+ __unlink_free_space(ctl, info);
+ ctl->free_space -= info->bytes;
}
-static int link_free_space(struct btrfs_block_group_cache *block_group,
+static int link_free_space(struct btrfs_free_space_ctl *ctl,
struct btrfs_free_space *info)
{
int ret = 0;
BUG_ON(!info->bitmap && !info->bytes);
- ret = tree_insert_offset(&block_group->free_space_offset, info->offset,
+ ret = tree_insert_offset(&ctl->free_space_offset, info->offset,
&info->offset_index, (info->bitmap != NULL));
if (ret)
return ret;
- block_group->free_space += info->bytes;
- block_group->free_extents++;
+ ctl->free_space += info->bytes;
+ ctl->free_extents++;
return ret;
}
-static void recalculate_thresholds(struct btrfs_block_group_cache *block_group)
+static void recalculate_thresholds(struct btrfs_free_space_ctl *ctl)
{
+ struct btrfs_block_group_cache *block_group = ctl->private;
u64 max_bytes;
u64 bitmap_bytes;
u64 extent_bytes;
u64 size = block_group->key.offset;
+ u64 bytes_per_bg = BITS_PER_BITMAP * block_group->sectorsize;
+ int max_bitmaps = div64_u64(size + bytes_per_bg - 1, bytes_per_bg);
+
+ BUG_ON(ctl->total_bitmaps > max_bitmaps);
/*
* The goal is to keep the total amount of memory used per 1gb of space
@@ -1112,10 +1170,10 @@ static void recalculate_thresholds(struct btrfs_block_group_cache *block_group)
* sure we don't go over our overall goal of MAX_CACHE_BYTES_PER_GIG as
* we add more bitmaps.
*/
- bitmap_bytes = (block_group->total_bitmaps + 1) * PAGE_CACHE_SIZE;
+ bitmap_bytes = (ctl->total_bitmaps + 1) * PAGE_CACHE_SIZE;
if (bitmap_bytes >= max_bytes) {
- block_group->extents_thresh = 0;
+ ctl->extents_thresh = 0;
return;
}
@@ -1126,47 +1184,43 @@ static void recalculate_thresholds(struct btrfs_block_group_cache *block_group)
extent_bytes = max_bytes - bitmap_bytes;
extent_bytes = min_t(u64, extent_bytes, div64_u64(max_bytes, 2));
- block_group->extents_thresh =
+ ctl->extents_thresh =
div64_u64(extent_bytes, (sizeof(struct btrfs_free_space)));
}
-static void bitmap_clear_bits(struct btrfs_block_group_cache *block_group,
+static void bitmap_clear_bits(struct btrfs_free_space_ctl *ctl,
struct btrfs_free_space *info, u64 offset,
u64 bytes)
{
- unsigned long start, end;
- unsigned long i;
+ unsigned long start, count;
- start = offset_to_bit(info->offset, block_group->sectorsize, offset);
- end = start + bytes_to_bits(bytes, block_group->sectorsize);
- BUG_ON(end > BITS_PER_BITMAP);
+ start = offset_to_bit(info->offset, ctl->unit, offset);
+ count = bytes_to_bits(bytes, ctl->unit);
+ BUG_ON(start + count > BITS_PER_BITMAP);
- for (i = start; i < end; i++)
- clear_bit(i, info->bitmap);
+ bitmap_clear(info->bitmap, start, count);
info->bytes -= bytes;
- block_group->free_space -= bytes;
+ ctl->free_space -= bytes;
}
-static void bitmap_set_bits(struct btrfs_block_group_cache *block_group,
+static void bitmap_set_bits(struct btrfs_free_space_ctl *ctl,
struct btrfs_free_space *info, u64 offset,
u64 bytes)
{
- unsigned long start, end;
- unsigned long i;
+ unsigned long start, count;
- start = offset_to_bit(info->offset, block_group->sectorsize, offset);
- end = start + bytes_to_bits(bytes, block_group->sectorsize);
- BUG_ON(end > BITS_PER_BITMAP);
+ start = offset_to_bit(info->offset, ctl->unit, offset);
+ count = bytes_to_bits(bytes, ctl->unit);
+ BUG_ON(start + count > BITS_PER_BITMAP);
- for (i = start; i < end; i++)
- set_bit(i, info->bitmap);
+ bitmap_set(info->bitmap, start, count);
info->bytes += bytes;
- block_group->free_space += bytes;
+ ctl->free_space += bytes;
}
-static int search_bitmap(struct btrfs_block_group_cache *block_group,
+static int search_bitmap(struct btrfs_free_space_ctl *ctl,
struct btrfs_free_space *bitmap_info, u64 *offset,
u64 *bytes)
{
@@ -1174,9 +1228,9 @@ static int search_bitmap(struct btrfs_block_group_cache *block_group,
unsigned long bits, i;
unsigned long next_zero;
- i = offset_to_bit(bitmap_info->offset, block_group->sectorsize,
+ i = offset_to_bit(bitmap_info->offset, ctl->unit,
max_t(u64, *offset, bitmap_info->offset));
- bits = bytes_to_bits(*bytes, block_group->sectorsize);
+ bits = bytes_to_bits(*bytes, ctl->unit);
for (i = find_next_bit(bitmap_info->bitmap, BITS_PER_BITMAP, i);
i < BITS_PER_BITMAP;
@@ -1191,29 +1245,25 @@ static int search_bitmap(struct btrfs_block_group_cache *block_group,
}
if (found_bits) {
- *offset = (u64)(i * block_group->sectorsize) +
- bitmap_info->offset;
- *bytes = (u64)(found_bits) * block_group->sectorsize;
+ *offset = (u64)(i * ctl->unit) + bitmap_info->offset;
+ *bytes = (u64)(found_bits) * ctl->unit;
return 0;
}
return -1;
}
-static struct btrfs_free_space *find_free_space(struct btrfs_block_group_cache
- *block_group, u64 *offset,
- u64 *bytes, int debug)
+static struct btrfs_free_space *
+find_free_space(struct btrfs_free_space_ctl *ctl, u64 *offset, u64 *bytes)
{
struct btrfs_free_space *entry;
struct rb_node *node;
int ret;
- if (!block_group->free_space_offset.rb_node)
+ if (!ctl->free_space_offset.rb_node)
return NULL;
- entry = tree_search_offset(block_group,
- offset_to_bitmap(block_group, *offset),
- 0, 1);
+ entry = tree_search_offset(ctl, offset_to_bitmap(ctl, *offset), 0, 1);
if (!entry)
return NULL;
@@ -1223,7 +1273,7 @@ static struct btrfs_free_space *find_free_space(struct btrfs_block_group_cache
continue;
if (entry->bitmap) {
- ret = search_bitmap(block_group, entry, offset, bytes);
+ ret = search_bitmap(ctl, entry, offset, bytes);
if (!ret)
return entry;
continue;
@@ -1237,33 +1287,28 @@ static struct btrfs_free_space *find_free_space(struct btrfs_block_group_cache
return NULL;
}
-static void add_new_bitmap(struct btrfs_block_group_cache *block_group,
+static void add_new_bitmap(struct btrfs_free_space_ctl *ctl,
struct btrfs_free_space *info, u64 offset)
{
- u64 bytes_per_bg = BITS_PER_BITMAP * block_group->sectorsize;
- int max_bitmaps = (int)div64_u64(block_group->key.offset +
- bytes_per_bg - 1, bytes_per_bg);
- BUG_ON(block_group->total_bitmaps >= max_bitmaps);
-
- info->offset = offset_to_bitmap(block_group, offset);
+ info->offset = offset_to_bitmap(ctl, offset);
info->bytes = 0;
- link_free_space(block_group, info);
- block_group->total_bitmaps++;
+ link_free_space(ctl, info);
+ ctl->total_bitmaps++;
- recalculate_thresholds(block_group);
+ ctl->op->recalc_thresholds(ctl);
}
-static void free_bitmap(struct btrfs_block_group_cache *block_group,
+static void free_bitmap(struct btrfs_free_space_ctl *ctl,
struct btrfs_free_space *bitmap_info)
{
- unlink_free_space(block_group, bitmap_info);
+ unlink_free_space(ctl, bitmap_info);
kfree(bitmap_info->bitmap);
kmem_cache_free(btrfs_free_space_cachep, bitmap_info);
- block_group->total_bitmaps--;
- recalculate_thresholds(block_group);
+ ctl->total_bitmaps--;
+ ctl->op->recalc_thresholds(ctl);
}
-static noinline int remove_from_bitmap(struct btrfs_block_group_cache *block_group,
+static noinline int remove_from_bitmap(struct btrfs_free_space_ctl *ctl,
struct btrfs_free_space *bitmap_info,
u64 *offset, u64 *bytes)
{
@@ -1272,8 +1317,7 @@ static noinline int remove_from_bitmap(struct btrfs_block_group_cache *block_gro
int ret;
again:
- end = bitmap_info->offset +
- (u64)(BITS_PER_BITMAP * block_group->sectorsize) - 1;
+ end = bitmap_info->offset + (u64)(BITS_PER_BITMAP * ctl->unit) - 1;
/*
* XXX - this can go away after a few releases.
@@ -1288,24 +1332,22 @@ again:
search_start = *offset;
search_bytes = *bytes;
search_bytes = min(search_bytes, end - search_start + 1);
- ret = search_bitmap(block_group, bitmap_info, &search_start,
- &search_bytes);
+ ret = search_bitmap(ctl, bitmap_info, &search_start, &search_bytes);
BUG_ON(ret < 0 || search_start != *offset);
if (*offset > bitmap_info->offset && *offset + *bytes > end) {
- bitmap_clear_bits(block_group, bitmap_info, *offset,
- end - *offset + 1);
+ bitmap_clear_bits(ctl, bitmap_info, *offset, end - *offset + 1);
*bytes -= end - *offset + 1;
*offset = end + 1;
} else if (*offset >= bitmap_info->offset && *offset + *bytes <= end) {
- bitmap_clear_bits(block_group, bitmap_info, *offset, *bytes);
+ bitmap_clear_bits(ctl, bitmap_info, *offset, *bytes);
*bytes = 0;
}
if (*bytes) {
struct rb_node *next = rb_next(&bitmap_info->offset_index);
if (!bitmap_info->bytes)
- free_bitmap(block_group, bitmap_info);
+ free_bitmap(ctl, bitmap_info);
/*
* no entry after this bitmap, but we still have bytes to
@@ -1332,31 +1374,28 @@ again:
*/
search_start = *offset;
search_bytes = *bytes;
- ret = search_bitmap(block_group, bitmap_info, &search_start,
+ ret = search_bitmap(ctl, bitmap_info, &search_start,
&search_bytes);
if (ret < 0 || search_start != *offset)
return -EAGAIN;
goto again;
} else if (!bitmap_info->bytes)
- free_bitmap(block_group, bitmap_info);
+ free_bitmap(ctl, bitmap_info);
return 0;
}
-static int insert_into_bitmap(struct btrfs_block_group_cache *block_group,
- struct btrfs_free_space *info)
+static bool use_bitmap(struct btrfs_free_space_ctl *ctl,
+ struct btrfs_free_space *info)
{
- struct btrfs_free_space *bitmap_info;
- int added = 0;
- u64 bytes, offset, end;
- int ret;
+ struct btrfs_block_group_cache *block_group = ctl->private;
/*
* If we are below the extents threshold then we can add this as an
* extent, and don't have to deal with the bitmap
*/
- if (block_group->free_extents < block_group->extents_thresh) {
+ if (ctl->free_extents < ctl->extents_thresh) {
/*
* If this block group has some small extents we don't want to
* use up all of our free slots in the cache with them, we want
@@ -1365,11 +1404,10 @@ static int insert_into_bitmap(struct btrfs_block_group_cache *block_group,
* the overhead of a bitmap if we don't have to.
*/
if (info->bytes <= block_group->sectorsize * 4) {
- if (block_group->free_extents * 2 <=
- block_group->extents_thresh)
- return 0;
+ if (ctl->free_extents * 2 <= ctl->extents_thresh)
+ return false;
} else {
- return 0;
+ return false;
}
}
@@ -1379,31 +1417,42 @@ static int insert_into_bitmap(struct btrfs_block_group_cache *block_group,
*/
if (BITS_PER_BITMAP * block_group->sectorsize >
block_group->key.offset)
- return 0;
+ return false;
+
+ return true;
+}
+
+static int insert_into_bitmap(struct btrfs_free_space_ctl *ctl,
+ struct btrfs_free_space *info)
+{
+ struct btrfs_free_space *bitmap_info;
+ int added = 0;
+ u64 bytes, offset, end;
+ int ret;
bytes = info->bytes;
offset = info->offset;
+ if (!ctl->op->use_bitmap(ctl, info))
+ return 0;
+
again:
- bitmap_info = tree_search_offset(block_group,
- offset_to_bitmap(block_group, offset),
+ bitmap_info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset),
1, 0);
if (!bitmap_info) {
BUG_ON(added);
goto new_bitmap;
}
- end = bitmap_info->offset +
- (u64)(BITS_PER_BITMAP * block_group->sectorsize);
+ end = bitmap_info->offset + (u64)(BITS_PER_BITMAP * ctl->unit);
if (offset >= bitmap_info->offset && offset + bytes > end) {
- bitmap_set_bits(block_group, bitmap_info, offset,
- end - offset);
+ bitmap_set_bits(ctl, bitmap_info, offset, end - offset);
bytes -= end - offset;
offset = end;
added = 0;
} else if (offset >= bitmap_info->offset && offset + bytes <= end) {
- bitmap_set_bits(block_group, bitmap_info, offset, bytes);
+ bitmap_set_bits(ctl, bitmap_info, offset, bytes);
bytes = 0;
} else {
BUG();
@@ -1417,19 +1466,19 @@ again:
new_bitmap:
if (info && info->bitmap) {
- add_new_bitmap(block_group, info, offset);
+ add_new_bitmap(ctl, info, offset);
added = 1;
info = NULL;
goto again;
} else {
- spin_unlock(&block_group->tree_lock);
+ spin_unlock(&ctl->tree_lock);
/* no pre-allocated info, allocate a new one */
if (!info) {
info = kmem_cache_zalloc(btrfs_free_space_cachep,
GFP_NOFS);
if (!info) {
- spin_lock(&block_group->tree_lock);
+ spin_lock(&ctl->tree_lock);
ret = -ENOMEM;
goto out;
}
@@ -1437,7 +1486,7 @@ new_bitmap:
/* allocate the bitmap */
info->bitmap = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS);
- spin_lock(&block_group->tree_lock);
+ spin_lock(&ctl->tree_lock);
if (!info->bitmap) {
ret = -ENOMEM;
goto out;
@@ -1455,7 +1504,7 @@ out:
return ret;
}
-bool try_merge_free_space(struct btrfs_block_group_cache *block_group,
+static bool try_merge_free_space(struct btrfs_free_space_ctl *ctl,
struct btrfs_free_space *info, bool update_stat)
{
struct btrfs_free_space *left_info;
@@ -1469,18 +1518,18 @@ bool try_merge_free_space(struct btrfs_block_group_cache *block_group,
* are adding, if there is remove that struct and add a new one to
* cover the entire range
*/
- right_info = tree_search_offset(block_group, offset + bytes, 0, 0);
+ right_info = tree_search_offset(ctl, offset + bytes, 0, 0);
if (right_info && rb_prev(&right_info->offset_index))
left_info = rb_entry(rb_prev(&right_info->offset_index),
struct btrfs_free_space, offset_index);
else
- left_info = tree_search_offset(block_group, offset - 1, 0, 0);
+ left_info = tree_search_offset(ctl, offset - 1, 0, 0);
if (right_info && !right_info->bitmap) {
if (update_stat)
- unlink_free_space(block_group, right_info);
+ unlink_free_space(ctl, right_info);
else
- __unlink_free_space(block_group, right_info);
+ __unlink_free_space(ctl, right_info);
info->bytes += right_info->bytes;
kmem_cache_free(btrfs_free_space_cachep, right_info);
merged = true;
@@ -1489,9 +1538,9 @@ bool try_merge_free_space(struct btrfs_block_group_cache *block_group,
if (left_info && !left_info->bitmap &&
left_info->offset + left_info->bytes == offset) {
if (update_stat)
- unlink_free_space(block_group, left_info);
+ unlink_free_space(ctl, left_info);
else
- __unlink_free_space(block_group, left_info);
+ __unlink_free_space(ctl, left_info);
info->offset = left_info->offset;
info->bytes += left_info->bytes;
kmem_cache_free(btrfs_free_space_cachep, left_info);
@@ -1501,8 +1550,8 @@ bool try_merge_free_space(struct btrfs_block_group_cache *block_group,
return merged;
}
-int btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
- u64 offset, u64 bytes)
+int __btrfs_add_free_space(struct btrfs_free_space_ctl *ctl,
+ u64 offset, u64 bytes)
{
struct btrfs_free_space *info;
int ret = 0;
@@ -1514,9 +1563,9 @@ int btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
info->offset = offset;
info->bytes = bytes;
- spin_lock(&block_group->tree_lock);
+ spin_lock(&ctl->tree_lock);
- if (try_merge_free_space(block_group, info, true))
+ if (try_merge_free_space(ctl, info, true))
goto link;
/*
@@ -1524,7 +1573,7 @@ int btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
* extent then we know we're going to have to allocate a new extent, so
* before we do that see if we need to drop this into a bitmap
*/
- ret = insert_into_bitmap(block_group, info);
+ ret = insert_into_bitmap(ctl, info);
if (ret < 0) {
goto out;
} else if (ret) {
@@ -1532,11 +1581,11 @@ int btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
goto out;
}
link:
- ret = link_free_space(block_group, info);
+ ret = link_free_space(ctl, info);
if (ret)
kmem_cache_free(btrfs_free_space_cachep, info);
out:
- spin_unlock(&block_group->tree_lock);
+ spin_unlock(&ctl->tree_lock);
if (ret) {
printk(KERN_CRIT "btrfs: unable to add free space :%d\n", ret);
@@ -1549,21 +1598,21 @@ out:
int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
u64 offset, u64 bytes)
{
+ struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
struct btrfs_free_space *info;
struct btrfs_free_space *next_info = NULL;
int ret = 0;
- spin_lock(&block_group->tree_lock);
+ spin_lock(&ctl->tree_lock);
again:
- info = tree_search_offset(block_group, offset, 0, 0);
+ info = tree_search_offset(ctl, offset, 0, 0);
if (!info) {
/*
* oops didn't find an extent that matched the space we wanted
* to remove, look for a bitmap instead
*/
- info = tree_search_offset(block_group,
- offset_to_bitmap(block_group, offset),
+ info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset),
1, 0);
if (!info) {
WARN_ON(1);
@@ -1578,8 +1627,8 @@ again:
offset_index);
if (next_info->bitmap)
- end = next_info->offset + BITS_PER_BITMAP *
- block_group->sectorsize - 1;
+ end = next_info->offset +
+ BITS_PER_BITMAP * ctl->unit - 1;
else
end = next_info->offset + next_info->bytes;
@@ -1599,20 +1648,20 @@ again:
}
if (info->bytes == bytes) {
- unlink_free_space(block_group, info);
+ unlink_free_space(ctl, info);
if (info->bitmap) {
kfree(info->bitmap);
- block_group->total_bitmaps--;
+ ctl->total_bitmaps--;
}
kmem_cache_free(btrfs_free_space_cachep, info);
goto out_lock;
}
if (!info->bitmap && info->offset == offset) {
- unlink_free_space(block_group, info);
+ unlink_free_space(ctl, info);
info->offset += bytes;
info->bytes -= bytes;
- link_free_space(block_group, info);
+ link_free_space(ctl, info);
goto out_lock;
}
@@ -1626,13 +1675,13 @@ again:
* first unlink the old info and then
* insert it again after the hole we're creating
*/
- unlink_free_space(block_group, info);
+ unlink_free_space(ctl, info);
if (offset + bytes < info->offset + info->bytes) {
u64 old_end = info->offset + info->bytes;
info->offset = offset + bytes;
info->bytes = old_end - info->offset;
- ret = link_free_space(block_group, info);
+ ret = link_free_space(ctl, info);
WARN_ON(ret);
if (ret)
goto out_lock;
@@ -1642,7 +1691,7 @@ again:
*/
kmem_cache_free(btrfs_free_space_cachep, info);
}
- spin_unlock(&block_group->tree_lock);
+ spin_unlock(&ctl->tree_lock);
/* step two, insert a new info struct to cover
* anything before the hole
@@ -1653,12 +1702,12 @@ again:
goto out;
}
- ret = remove_from_bitmap(block_group, info, &offset, &bytes);
+ ret = remove_from_bitmap(ctl, info, &offset, &bytes);
if (ret == -EAGAIN)
goto again;
BUG_ON(ret);
out_lock:
- spin_unlock(&block_group->tree_lock);
+ spin_unlock(&ctl->tree_lock);
out:
return ret;
}
@@ -1666,11 +1715,12 @@ out:
void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
u64 bytes)
{
+ struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
struct btrfs_free_space *info;
struct rb_node *n;
int count = 0;
- for (n = rb_first(&block_group->free_space_offset); n; n = rb_next(n)) {
+ for (n = rb_first(&ctl->free_space_offset); n; n = rb_next(n)) {
info = rb_entry(n, struct btrfs_free_space, offset_index);
if (info->bytes >= bytes)
count++;
@@ -1685,19 +1735,28 @@ void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
"\n", count);
}
-u64 btrfs_block_group_free_space(struct btrfs_block_group_cache *block_group)
+static struct btrfs_free_space_op free_space_op = {
+ .recalc_thresholds = recalculate_thresholds,
+ .use_bitmap = use_bitmap,
+};
+
+void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group)
{
- struct btrfs_free_space *info;
- struct rb_node *n;
- u64 ret = 0;
+ struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
- for (n = rb_first(&block_group->free_space_offset); n;
- n = rb_next(n)) {
- info = rb_entry(n, struct btrfs_free_space, offset_index);
- ret += info->bytes;
- }
+ spin_lock_init(&ctl->tree_lock);
+ ctl->unit = block_group->sectorsize;
+ ctl->start = block_group->key.objectid;
+ ctl->private = block_group;
+ ctl->op = &free_space_op;
- return ret;
+ /*
+ * we only want to have 32k of ram per block group for keeping
+ * track of free space, and if we pass 1/2 of that we want to
+ * start converting things over to using bitmaps
+ */
+ ctl->extents_thresh = ((1024 * 32) / 2) /
+ sizeof(struct btrfs_free_space);
}
/*
@@ -1711,6 +1770,7 @@ __btrfs_return_cluster_to_free_space(
struct btrfs_block_group_cache *block_group,
struct btrfs_free_cluster *cluster)
{
+ struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
struct btrfs_free_space *entry;
struct rb_node *node;
@@ -1732,8 +1792,8 @@ __btrfs_return_cluster_to_free_space(
bitmap = (entry->bitmap != NULL);
if (!bitmap)
- try_merge_free_space(block_group, entry, false);
- tree_insert_offset(&block_group->free_space_offset,
+ try_merge_free_space(ctl, entry, false);
+ tree_insert_offset(&ctl->free_space_offset,
entry->offset, &entry->offset_index, bitmap);
}
cluster->root = RB_ROOT;
@@ -1744,14 +1804,38 @@ out:
return 0;
}
-void btrfs_remove_free_space_cache(struct btrfs_block_group_cache *block_group)
+void __btrfs_remove_free_space_cache_locked(struct btrfs_free_space_ctl *ctl)
{
struct btrfs_free_space *info;
struct rb_node *node;
+
+ while ((node = rb_last(&ctl->free_space_offset)) != NULL) {
+ info = rb_entry(node, struct btrfs_free_space, offset_index);
+ unlink_free_space(ctl, info);
+ kfree(info->bitmap);
+ kmem_cache_free(btrfs_free_space_cachep, info);
+ if (need_resched()) {
+ spin_unlock(&ctl->tree_lock);
+ cond_resched();
+ spin_lock(&ctl->tree_lock);
+ }
+ }
+}
+
+void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl)
+{
+ spin_lock(&ctl->tree_lock);
+ __btrfs_remove_free_space_cache_locked(ctl);
+ spin_unlock(&ctl->tree_lock);
+}
+
+void btrfs_remove_free_space_cache(struct btrfs_block_group_cache *block_group)
+{
+ struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
struct btrfs_free_cluster *cluster;
struct list_head *head;
- spin_lock(&block_group->tree_lock);
+ spin_lock(&ctl->tree_lock);
while ((head = block_group->cluster_list.next) !=
&block_group->cluster_list) {
cluster = list_entry(head, struct btrfs_free_cluster,
@@ -1760,60 +1844,46 @@ void btrfs_remove_free_space_cache(struct btrfs_block_group_cache *block_group)
WARN_ON(cluster->block_group != block_group);
__btrfs_return_cluster_to_free_space(block_group, cluster);
if (need_resched()) {
- spin_unlock(&block_group->tree_lock);
+ spin_unlock(&ctl->tree_lock);
cond_resched();
- spin_lock(&block_group->tree_lock);
+ spin_lock(&ctl->tree_lock);
}
}
+ __btrfs_remove_free_space_cache_locked(ctl);
+ spin_unlock(&ctl->tree_lock);
- while ((node = rb_last(&block_group->free_space_offset)) != NULL) {
- info = rb_entry(node, struct btrfs_free_space, offset_index);
- if (!info->bitmap) {
- unlink_free_space(block_group, info);
- kmem_cache_free(btrfs_free_space_cachep, info);
- } else {
- free_bitmap(block_group, info);
- }
-
- if (need_resched()) {
- spin_unlock(&block_group->tree_lock);
- cond_resched();
- spin_lock(&block_group->tree_lock);
- }
- }
-
- spin_unlock(&block_group->tree_lock);
}
u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group,
u64 offset, u64 bytes, u64 empty_size)
{
+ struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
struct btrfs_free_space *entry = NULL;
u64 bytes_search = bytes + empty_size;
u64 ret = 0;
- spin_lock(&block_group->tree_lock);
- entry = find_free_space(block_group, &offset, &bytes_search, 0);
+ spin_lock(&ctl->tree_lock);
+ entry = find_free_space(ctl, &offset, &bytes_search);
if (!entry)
goto out;
ret = offset;
if (entry->bitmap) {
- bitmap_clear_bits(block_group, entry, offset, bytes);
+ bitmap_clear_bits(ctl, entry, offset, bytes);
if (!entry->bytes)
- free_bitmap(block_group, entry);
+ free_bitmap(ctl, entry);
} else {
- unlink_free_space(block_group, entry);
+ unlink_free_space(ctl, entry);
entry->offset += bytes;
entry->bytes -= bytes;
if (!entry->bytes)
kmem_cache_free(btrfs_free_space_cachep, entry);
else
- link_free_space(block_group, entry);
+ link_free_space(ctl, entry);
}
out:
- spin_unlock(&block_group->tree_lock);
+ spin_unlock(&ctl->tree_lock);
return ret;
}
@@ -1830,6 +1900,7 @@ int btrfs_return_cluster_to_free_space(
struct btrfs_block_group_cache *block_group,
struct btrfs_free_cluster *cluster)
{
+ struct btrfs_free_space_ctl *ctl;
int ret;
/* first, get a safe pointer to the block group */
@@ -1848,10 +1919,12 @@ int btrfs_return_cluster_to_free_space(
atomic_inc(&block_group->count);
spin_unlock(&cluster->lock);
+ ctl = block_group->free_space_ctl;
+
/* now return any extents the cluster had on it */
- spin_lock(&block_group->tree_lock);
+ spin_lock(&ctl->tree_lock);
ret = __btrfs_return_cluster_to_free_space(block_group, cluster);
- spin_unlock(&block_group->tree_lock);
+ spin_unlock(&ctl->tree_lock);
/* finally drop our ref */
btrfs_put_block_group(block_group);
@@ -1863,6 +1936,7 @@ static u64 btrfs_alloc_from_bitmap(struct btrfs_block_group_cache *block_group,
struct btrfs_free_space *entry,
u64 bytes, u64 min_start)
{
+ struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
int err;
u64 search_start = cluster->window_start;
u64 search_bytes = bytes;
@@ -1871,13 +1945,12 @@ static u64 btrfs_alloc_from_bitmap(struct btrfs_block_group_cache *block_group,
search_start = min_start;
search_bytes = bytes;
- err = search_bitmap(block_group, entry, &search_start,
- &search_bytes);
+ err = search_bitmap(ctl, entry, &search_start, &search_bytes);
if (err)
return 0;
ret = search_start;
- bitmap_clear_bits(block_group, entry, ret, bytes);
+ bitmap_clear_bits(ctl, entry, ret, bytes);
return ret;
}
@@ -1891,6 +1964,7 @@ u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
struct btrfs_free_cluster *cluster, u64 bytes,
u64 min_start)
{
+ struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
struct btrfs_free_space *entry = NULL;
struct rb_node *node;
u64 ret = 0;
@@ -1910,8 +1984,6 @@ u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
while(1) {
if (entry->bytes < bytes ||
(!entry->bitmap && entry->offset < min_start)) {
- struct rb_node *node;
-
node = rb_next(&entry->offset_index);
if (!node)
break;
@@ -1925,7 +1997,6 @@ u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
cluster, entry, bytes,
min_start);
if (ret == 0) {
- struct rb_node *node;
node = rb_next(&entry->offset_index);
if (!node)
break;
@@ -1951,20 +2022,20 @@ out:
if (!ret)
return 0;
- spin_lock(&block_group->tree_lock);
+ spin_lock(&ctl->tree_lock);
- block_group->free_space -= bytes;
+ ctl->free_space -= bytes;
if (entry->bytes == 0) {
- block_group->free_extents--;
+ ctl->free_extents--;
if (entry->bitmap) {
kfree(entry->bitmap);
- block_group->total_bitmaps--;
- recalculate_thresholds(block_group);
+ ctl->total_bitmaps--;
+ ctl->op->recalc_thresholds(ctl);
}
kmem_cache_free(btrfs_free_space_cachep, entry);
}
- spin_unlock(&block_group->tree_lock);
+ spin_unlock(&ctl->tree_lock);
return ret;
}
@@ -1974,6 +2045,7 @@ static int btrfs_bitmap_cluster(struct btrfs_block_group_cache *block_group,
struct btrfs_free_cluster *cluster,
u64 offset, u64 bytes, u64 min_bytes)
{
+ struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
unsigned long next_zero;
unsigned long i;
unsigned long search_bits;
@@ -2028,7 +2100,7 @@ again:
cluster->window_start = start * block_group->sectorsize +
entry->offset;
- rb_erase(&entry->offset_index, &block_group->free_space_offset);
+ rb_erase(&entry->offset_index, &ctl->free_space_offset);
ret = tree_insert_offset(&cluster->root, entry->offset,
&entry->offset_index, 1);
BUG_ON(ret);
@@ -2043,6 +2115,7 @@ static int setup_cluster_no_bitmap(struct btrfs_block_group_cache *block_group,
struct btrfs_free_cluster *cluster,
u64 offset, u64 bytes, u64 min_bytes)
{
+ struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
struct btrfs_free_space *first = NULL;
struct btrfs_free_space *entry = NULL;
struct btrfs_free_space *prev = NULL;
@@ -2053,7 +2126,7 @@ static int setup_cluster_no_bitmap(struct btrfs_block_group_cache *block_group,
u64 max_extent;
u64 max_gap = 128 * 1024;
- entry = tree_search_offset(block_group, offset, 0, 1);
+ entry = tree_search_offset(ctl, offset, 0, 1);
if (!entry)
return -ENOSPC;
@@ -2119,7 +2192,7 @@ static int setup_cluster_no_bitmap(struct btrfs_block_group_cache *block_group,
if (entry->bitmap)
continue;
- rb_erase(&entry->offset_index, &block_group->free_space_offset);
+ rb_erase(&entry->offset_index, &ctl->free_space_offset);
ret = tree_insert_offset(&cluster->root, entry->offset,
&entry->offset_index, 0);
BUG_ON(ret);
@@ -2138,16 +2211,15 @@ static int setup_cluster_bitmap(struct btrfs_block_group_cache *block_group,
struct btrfs_free_cluster *cluster,
u64 offset, u64 bytes, u64 min_bytes)
{
+ struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
struct btrfs_free_space *entry;
struct rb_node *node;
int ret = -ENOSPC;
- if (block_group->total_bitmaps == 0)
+ if (ctl->total_bitmaps == 0)
return -ENOSPC;
- entry = tree_search_offset(block_group,
- offset_to_bitmap(block_group, offset),
- 0, 1);
+ entry = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), 0, 1);
if (!entry)
return -ENOSPC;
@@ -2180,6 +2252,7 @@ int btrfs_find_space_cluster(struct btrfs_trans_handle *trans,
struct btrfs_free_cluster *cluster,
u64 offset, u64 bytes, u64 empty_size)
{
+ struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
u64 min_bytes;
int ret;
@@ -2199,14 +2272,14 @@ int btrfs_find_space_cluster(struct btrfs_trans_handle *trans,
} else
min_bytes = max(bytes, (bytes + empty_size) >> 2);
- spin_lock(&block_group->tree_lock);
+ spin_lock(&ctl->tree_lock);
/*
* If we know we don't have enough space to make a cluster don't even
* bother doing all the work to try and find one.
*/
- if (block_group->free_space < min_bytes) {
- spin_unlock(&block_group->tree_lock);
+ if (ctl->free_space < min_bytes) {
+ spin_unlock(&ctl->tree_lock);
return -ENOSPC;
}
@@ -2232,7 +2305,7 @@ int btrfs_find_space_cluster(struct btrfs_trans_handle *trans,
}
out:
spin_unlock(&cluster->lock);
- spin_unlock(&block_group->tree_lock);
+ spin_unlock(&ctl->tree_lock);
return ret;
}
@@ -2253,6 +2326,7 @@ void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster)
int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group,
u64 *trimmed, u64 start, u64 end, u64 minlen)
{
+ struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
struct btrfs_free_space *entry = NULL;
struct btrfs_fs_info *fs_info = block_group->fs_info;
u64 bytes = 0;
@@ -2262,52 +2336,50 @@ int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group,
*trimmed = 0;
while (start < end) {
- spin_lock(&block_group->tree_lock);
+ spin_lock(&ctl->tree_lock);
- if (block_group->free_space < minlen) {
- spin_unlock(&block_group->tree_lock);
+ if (ctl->free_space < minlen) {
+ spin_unlock(&ctl->tree_lock);
break;
}
- entry = tree_search_offset(block_group, start, 0, 1);
+ entry = tree_search_offset(ctl, start, 0, 1);
if (!entry)
- entry = tree_search_offset(block_group,
- offset_to_bitmap(block_group,
- start),
+ entry = tree_search_offset(ctl,
+ offset_to_bitmap(ctl, start),
1, 1);
if (!entry || entry->offset >= end) {
- spin_unlock(&block_group->tree_lock);
+ spin_unlock(&ctl->tree_lock);
break;
}
if (entry->bitmap) {
- ret = search_bitmap(block_group, entry, &start, &bytes);
+ ret = search_bitmap(ctl, entry, &start, &bytes);
if (!ret) {
if (start >= end) {
- spin_unlock(&block_group->tree_lock);
+ spin_unlock(&ctl->tree_lock);
break;
}
bytes = min(bytes, end - start);
- bitmap_clear_bits(block_group, entry,
- start, bytes);
+ bitmap_clear_bits(ctl, entry, start, bytes);
if (entry->bytes == 0)
- free_bitmap(block_group, entry);
+ free_bitmap(ctl, entry);
} else {
start = entry->offset + BITS_PER_BITMAP *
block_group->sectorsize;
- spin_unlock(&block_group->tree_lock);
+ spin_unlock(&ctl->tree_lock);
ret = 0;
continue;
}
} else {
start = entry->offset;
bytes = min(entry->bytes, end - start);
- unlink_free_space(block_group, entry);
+ unlink_free_space(ctl, entry);
kmem_cache_free(btrfs_free_space_cachep, entry);
}
- spin_unlock(&block_group->tree_lock);
+ spin_unlock(&ctl->tree_lock);
if (bytes >= minlen) {
int update_ret;
@@ -2319,8 +2391,7 @@ int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group,
bytes,
&actually_trimmed);
- btrfs_add_free_space(block_group,
- start, bytes);
+ btrfs_add_free_space(block_group, start, bytes);
if (!update_ret)
btrfs_update_reserved_bytes(block_group,
bytes, 0, 1);
@@ -2342,3 +2413,145 @@ int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group,
return ret;
}
+
+/*
+ * Find the left-most item in the cache tree, and then return the
+ * smallest inode number in the item.
+ *
+ * Note: the returned inode number may not be the smallest one in
+ * the tree, if the left-most item is a bitmap.
+ */
+u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root)
+{
+ struct btrfs_free_space_ctl *ctl = fs_root->free_ino_ctl;
+ struct btrfs_free_space *entry = NULL;
+ u64 ino = 0;
+
+ spin_lock(&ctl->tree_lock);
+
+ if (RB_EMPTY_ROOT(&ctl->free_space_offset))
+ goto out;
+
+ entry = rb_entry(rb_first(&ctl->free_space_offset),
+ struct btrfs_free_space, offset_index);
+
+ if (!entry->bitmap) {
+ ino = entry->offset;
+
+ unlink_free_space(ctl, entry);
+ entry->offset++;
+ entry->bytes--;
+ if (!entry->bytes)
+ kmem_cache_free(btrfs_free_space_cachep, entry);
+ else
+ link_free_space(ctl, entry);
+ } else {
+ u64 offset = 0;
+ u64 count = 1;
+ int ret;
+
+ ret = search_bitmap(ctl, entry, &offset, &count);
+ BUG_ON(ret);
+
+ ino = offset;
+ bitmap_clear_bits(ctl, entry, offset, 1);
+ if (entry->bytes == 0)
+ free_bitmap(ctl, entry);
+ }
+out:
+ spin_unlock(&ctl->tree_lock);
+
+ return ino;
+}
+
+struct inode *lookup_free_ino_inode(struct btrfs_root *root,
+ struct btrfs_path *path)
+{
+ struct inode *inode = NULL;
+
+ spin_lock(&root->cache_lock);
+ if (root->cache_inode)
+ inode = igrab(root->cache_inode);
+ spin_unlock(&root->cache_lock);
+ if (inode)
+ return inode;
+
+ inode = __lookup_free_space_inode(root, path, 0);
+ if (IS_ERR(inode))
+ return inode;
+
+ spin_lock(&root->cache_lock);
+ if (!root->fs_info->closing)
+ root->cache_inode = igrab(inode);
+ spin_unlock(&root->cache_lock);
+
+ return inode;
+}
+
+int create_free_ino_inode(struct btrfs_root *root,
+ struct btrfs_trans_handle *trans,
+ struct btrfs_path *path)
+{
+ return __create_free_space_inode(root, trans, path,
+ BTRFS_FREE_INO_OBJECTID, 0);
+}
+
+int load_free_ino_cache(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
+{
+ struct btrfs_free_space_ctl *ctl = root->free_ino_ctl;
+ struct btrfs_path *path;
+ struct inode *inode;
+ int ret = 0;
+ u64 root_gen = btrfs_root_generation(&root->root_item);
+
+ /*
+ * If we're unmounting then just return, since this does a search on the
+ * normal root and not the commit root and we could deadlock.
+ */
+ smp_mb();
+ if (fs_info->closing)
+ return 0;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return 0;
+
+ inode = lookup_free_ino_inode(root, path);
+ if (IS_ERR(inode))
+ goto out;
+
+ if (root_gen != BTRFS_I(inode)->generation)
+ goto out_put;
+
+ ret = __load_free_space_cache(root, inode, ctl, path, 0);
+
+ if (ret < 0)
+ printk(KERN_ERR "btrfs: failed to load free ino cache for "
+ "root %llu\n", root->root_key.objectid);
+out_put:
+ iput(inode);
+out:
+ btrfs_free_path(path);
+ return ret;
+}
+
+int btrfs_write_out_ino_cache(struct btrfs_root *root,
+ struct btrfs_trans_handle *trans,
+ struct btrfs_path *path)
+{
+ struct btrfs_free_space_ctl *ctl = root->free_ino_ctl;
+ struct inode *inode;
+ int ret;
+
+ inode = lookup_free_ino_inode(root, path);
+ if (IS_ERR(inode))
+ return 0;
+
+ ret = __btrfs_write_out_cache(root, inode, ctl, NULL, trans, path, 0);
+ if (ret < 0)
+ printk(KERN_ERR "btrfs: failed to write free ino cache "
+ "for root %llu\n", root->root_key.objectid);
+
+ iput(inode);
+ return ret;
+}
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-05 06:45:08 +0000