* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
-
#include <linux/sched.h>
+#include <linux/pagemap.h>
+#include <linux/writeback.h>
+#include "hash.h"
+#include "crc32c.h"
#include "ctree.h"
#include "disk-io.h"
#include "print-tree.h"
#include "transaction.h"
+#include "volumes.h"
+#include "locking.h"
-#define BLOCK_GROUP_DATA EXTENT_WRITEBACK
+#define BLOCK_GROUP_DATA EXTENT_WRITEBACK
#define BLOCK_GROUP_METADATA EXTENT_UPTODATE
+#define BLOCK_GROUP_SYSTEM EXTENT_NEW
+
#define BLOCK_GROUP_DIRTY EXTENT_DIRTY
static int finish_current_insert(struct btrfs_trans_handle *trans, struct
btrfs_root *extent_root);
static int del_pending_extents(struct btrfs_trans_handle *trans, struct
btrfs_root *extent_root);
+static struct btrfs_block_group_cache *
+__btrfs_find_block_group(struct btrfs_root *root,
+ struct btrfs_block_group_cache *hint,
+ u64 search_start, int data, int owner);
+
+void maybe_lock_mutex(struct btrfs_root *root)
+{
+ if (root != root->fs_info->extent_root &&
+ root != root->fs_info->chunk_root &&
+ root != root->fs_info->dev_root) {
+ mutex_lock(&root->fs_info->alloc_mutex);
+ }
+}
+
+void maybe_unlock_mutex(struct btrfs_root *root)
+{
+ if (root != root->fs_info->extent_root &&
+ root != root->fs_info->chunk_root &&
+ root != root->fs_info->dev_root) {
+ mutex_unlock(&root->fs_info->alloc_mutex);
+ }
+}
static int cache_block_group(struct btrfs_root *root,
struct btrfs_block_group_cache *block_group)
int ret;
struct btrfs_key key;
struct extent_buffer *leaf;
- struct extent_map_tree *free_space_cache;
+ struct extent_io_tree *free_space_cache;
int slot;
u64 last = 0;
u64 hole_size;
u64 first_free;
int found = 0;
+ if (!block_group)
+ return 0;
+
root = root->fs_info->extent_root;
free_space_cache = &root->fs_info->free_space_cache;
return -ENOMEM;
path->reada = 2;
+ /*
+ * we get into deadlocks with paths held by callers of this function.
+ * since the alloc_mutex is protecting things right now, just
+ * skip the locking here
+ */
+ path->skip_locking = 1;
first_free = block_group->key.objectid;
key.objectid = block_group->key.objectid;
key.offset = 0;
-
btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
-
if (ret < 0)
return ret;
-
- if (ret && path->slots[0] > 0)
- path->slots[0]--;
-
+ ret = btrfs_previous_item(root, path, 0, BTRFS_EXTENT_ITEM_KEY);
+ if (ret < 0)
+ return ret;
+ if (ret == 0) {
+ leaf = path->nodes[0];
+ btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
+ if (key.objectid + key.offset > first_free)
+ first_free = key.objectid + key.offset;
+ }
while(1) {
leaf = path->nodes[0];
slot = path->slots[0];
break;
}
}
-
btrfs_item_key_to_cpu(leaf, &key, slot);
if (key.objectid < block_group->key.objectid) {
- if (key.objectid + key.offset > first_free)
- first_free = key.objectid + key.offset;
goto next;
}
-
if (key.objectid >= block_group->key.objectid +
block_group->key.offset) {
break;
return 0;
}
+struct btrfs_block_group_cache *btrfs_lookup_first_block_group(struct
+ btrfs_fs_info *info,
+ u64 bytenr)
+{
+ struct extent_io_tree *block_group_cache;
+ struct btrfs_block_group_cache *block_group = NULL;
+ u64 ptr;
+ u64 start;
+ u64 end;
+ int ret;
+
+ bytenr = max_t(u64, bytenr,
+ BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE);
+ block_group_cache = &info->block_group_cache;
+ ret = find_first_extent_bit(block_group_cache,
+ bytenr, &start, &end,
+ BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA |
+ BLOCK_GROUP_SYSTEM);
+ if (ret) {
+ return NULL;
+ }
+ ret = get_state_private(block_group_cache, start, &ptr);
+ if (ret)
+ return NULL;
+
+ block_group = (struct btrfs_block_group_cache *)(unsigned long)ptr;
+ return block_group;
+}
+
struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
btrfs_fs_info *info,
u64 bytenr)
{
- struct extent_map_tree *block_group_cache;
+ struct extent_io_tree *block_group_cache;
struct btrfs_block_group_cache *block_group = NULL;
u64 ptr;
u64 start;
u64 end;
int ret;
+ bytenr = max_t(u64, bytenr,
+ BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE);
block_group_cache = &info->block_group_cache;
ret = find_first_extent_bit(block_group_cache,
bytenr, &start, &end,
- BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA);
+ BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA |
+ BLOCK_GROUP_SYSTEM);
if (ret) {
return NULL;
}
return block_group;
return NULL;
}
-static u64 find_search_start(struct btrfs_root *root,
- struct btrfs_block_group_cache **cache_ret,
- u64 search_start, int num,
- int data, int full_scan)
+
+static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits)
+{
+ return (cache->flags & bits) == bits;
+}
+
+static int noinline find_search_start(struct btrfs_root *root,
+ struct btrfs_block_group_cache **cache_ret,
+ u64 *start_ret, u64 num, int data)
{
int ret;
struct btrfs_block_group_cache *cache = *cache_ret;
+ struct extent_io_tree *free_space_cache;
+ struct extent_state *state;
u64 last;
u64 start = 0;
- u64 end = 0;
u64 cache_miss = 0;
+ u64 total_fs_bytes;
+ u64 search_start = *start_ret;
int wrapped = 0;
+ WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex));
+ total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
+ free_space_cache = &root->fs_info->free_space_cache;
+
+ if (!cache)
+ goto out;
+
again:
ret = cache_block_group(root, cache);
- if (ret)
+ if (ret) {
goto out;
+ }
last = max(search_start, cache->key.objectid);
+ if (!block_group_bits(cache, data) || cache->ro)
+ goto new_group;
+ spin_lock_irq(&free_space_cache->lock);
+ state = find_first_extent_bit_state(free_space_cache, last, EXTENT_DIRTY);
while(1) {
- ret = find_first_extent_bit(&root->fs_info->free_space_cache,
- last, &start, &end, EXTENT_DIRTY);
- if (ret) {
+ if (!state) {
if (!cache_miss)
cache_miss = last;
+ spin_unlock_irq(&free_space_cache->lock);
goto new_group;
}
- start = max(last, start);
- last = end + 1;
+ start = max(last, state->start);
+ last = state->end + 1;
if (last - start < num) {
- if (last == cache->key.objectid + cache->key.offset)
- cache_miss = start;
+ do {
+ state = extent_state_next(state);
+ } while(state && !(state->state & EXTENT_DIRTY));
continue;
}
- if (data != BTRFS_BLOCK_GROUP_MIXED &&
- start + num > cache->key.objectid + cache->key.offset)
+ 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;
- return start;
+ if (!block_group_bits(cache, data)) {
+ printk("block group bits don't match %Lu %d\n", cache->flags, data);
+ }
+ *start_ret = start;
+ return 0;
}
out:
- return search_start;
+ cache = btrfs_lookup_block_group(root->fs_info, search_start);
+ if (!cache) {
+ printk("Unable to find block group for %Lu\n", search_start);
+ WARN_ON(1);
+ }
+ return -ENOSPC;
new_group:
last = cache->key.objectid + cache->key.offset;
wrapped:
- cache = btrfs_lookup_block_group(root->fs_info, last);
- if (!cache) {
+ cache = btrfs_lookup_first_block_group(root->fs_info, last);
+ if (!cache || cache->key.objectid >= total_fs_bytes) {
+no_cache:
if (!wrapped) {
wrapped = 1;
last = search_start;
- data = BTRFS_BLOCK_GROUP_MIXED;
goto wrapped;
}
- return search_start;
+ goto out;
}
if (cache_miss && !cache->cached) {
cache_block_group(root, cache);
last = cache_miss;
- cache = btrfs_lookup_block_group(root->fs_info, last);
+ cache = btrfs_lookup_first_block_group(root->fs_info, last);
}
- if (!full_scan)
- cache = btrfs_find_block_group(root, cache, last, data, 0);
- *cache_ret = cache;
cache_miss = 0;
+ cache = btrfs_find_block_group(root, cache, last, data, 0);
+ if (!cache)
+ goto no_cache;
+ *cache_ret = cache;
goto again;
}
return num;
}
-struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
- struct btrfs_block_group_cache
- *hint, u64 search_start,
- int data, int owner)
+static int block_group_state_bits(u64 flags)
+{
+ int bits = 0;
+ if (flags & BTRFS_BLOCK_GROUP_DATA)
+ bits |= BLOCK_GROUP_DATA;
+ if (flags & BTRFS_BLOCK_GROUP_METADATA)
+ bits |= BLOCK_GROUP_METADATA;
+ if (flags & BTRFS_BLOCK_GROUP_SYSTEM)
+ bits |= BLOCK_GROUP_SYSTEM;
+ return bits;
+}
+
+static struct btrfs_block_group_cache *
+__btrfs_find_block_group(struct btrfs_root *root,
+ struct btrfs_block_group_cache *hint,
+ u64 search_start, int data, int owner)
{
struct btrfs_block_group_cache *cache;
- struct extent_map_tree *block_group_cache;
+ struct extent_io_tree *block_group_cache;
struct btrfs_block_group_cache *found_group = NULL;
struct btrfs_fs_info *info = root->fs_info;
u64 used;
u64 last = 0;
- u64 hint_last;
u64 start;
u64 end;
u64 free_check;
int bit;
int ret;
int full_search = 0;
- int factor = 8;
- int data_swap = 0;
+ int factor = 10;
+ int wrapped = 0;
block_group_cache = &info->block_group_cache;
- if (!owner)
- factor = 8;
+ if (data & BTRFS_BLOCK_GROUP_METADATA)
+ factor = 9;
- if (data == BTRFS_BLOCK_GROUP_MIXED) {
- bit = BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA;
- factor = 10;
- } else if (data)
- bit = BLOCK_GROUP_DATA;
- else
- bit = BLOCK_GROUP_METADATA;
+ bit = block_group_state_bits(data);
if (search_start) {
struct btrfs_block_group_cache *shint;
- shint = btrfs_lookup_block_group(info, search_start);
- if (shint && (shint->data == data ||
- shint->data == BTRFS_BLOCK_GROUP_MIXED)) {
+ shint = btrfs_lookup_first_block_group(info, search_start);
+ if (shint && block_group_bits(shint, data) && !shint->ro) {
+ spin_lock(&shint->lock);
used = btrfs_block_group_used(&shint->item);
if (used + shint->pinned <
div_factor(shint->key.offset, factor)) {
+ spin_unlock(&shint->lock);
return shint;
}
+ spin_unlock(&shint->lock);
}
}
- if (hint && (hint->data == data ||
- hint->data == BTRFS_BLOCK_GROUP_MIXED)) {
+ if (hint && !hint->ro && block_group_bits(hint, data)) {
+ spin_lock(&hint->lock);
used = btrfs_block_group_used(&hint->item);
if (used + hint->pinned <
div_factor(hint->key.offset, factor)) {
+ spin_unlock(&hint->lock);
return hint;
}
+ spin_unlock(&hint->lock);
last = hint->key.objectid + hint->key.offset;
- hint_last = last;
} else {
if (hint)
- hint_last = max(hint->key.objectid, search_start);
+ last = max(hint->key.objectid, search_start);
else
- hint_last = search_start;
-
- last = hint_last;
+ last = search_start;
}
again:
while(1) {
break;
ret = get_state_private(block_group_cache, start, &ptr);
- if (ret)
- break;
+ if (ret) {
+ last = end + 1;
+ continue;
+ }
cache = (struct btrfs_block_group_cache *)(unsigned long)ptr;
+ spin_lock(&cache->lock);
last = cache->key.objectid + cache->key.offset;
used = btrfs_block_group_used(&cache->item);
- if (full_search)
- free_check = cache->key.offset;
- else
+ if (!cache->ro && block_group_bits(cache, data)) {
free_check = div_factor(cache->key.offset, factor);
- if (used + cache->pinned < free_check) {
- found_group = cache;
- goto found;
+ if (used + cache->pinned < free_check) {
+ found_group = cache;
+ spin_unlock(&cache->lock);
+ goto found;
+ }
}
+ spin_unlock(&cache->lock);
cond_resched();
}
- if (!full_search) {
+ if (!wrapped) {
last = search_start;
- full_search = 1;
+ wrapped = 1;
goto again;
}
- if (!data_swap) {
- data_swap = 1;
- bit = BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA;
+ if (!full_search && factor < 10) {
last = search_start;
+ full_search = 1;
+ factor = 10;
goto again;
}
found:
return found_group;
}
-int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
+struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
+ struct btrfs_block_group_cache
+ *hint, u64 search_start,
+ int data, int owner)
+{
+
+ struct btrfs_block_group_cache *ret;
+ ret = __btrfs_find_block_group(root, hint, search_start, data, owner);
+ return ret;
+}
+static u64 hash_extent_ref(u64 root_objectid, u64 ref_generation,
+ u64 owner, u64 owner_offset)
+{
+ u32 high_crc = ~(u32)0;
+ u32 low_crc = ~(u32)0;
+ __le64 lenum;
+ lenum = cpu_to_le64(root_objectid);
+ high_crc = btrfs_crc32c(high_crc, &lenum, sizeof(lenum));
+ lenum = cpu_to_le64(ref_generation);
+ low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum));
+ if (owner >= BTRFS_FIRST_FREE_OBJECTID) {
+ lenum = cpu_to_le64(owner);
+ low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum));
+ lenum = cpu_to_le64(owner_offset);
+ low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum));
+ }
+ return ((u64)high_crc << 32) | (u64)low_crc;
+}
+
+static int match_extent_ref(struct extent_buffer *leaf,
+ struct btrfs_extent_ref *disk_ref,
+ struct btrfs_extent_ref *cpu_ref)
+{
+ int ret;
+ int len;
+
+ if (cpu_ref->objectid)
+ len = sizeof(*cpu_ref);
+ else
+ len = 2 * sizeof(u64);
+ ret = memcmp_extent_buffer(leaf, cpu_ref, (unsigned long)disk_ref,
+ len);
+ return ret == 0;
+}
+
+static int noinline lookup_extent_backref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, u64 bytenr,
+ u64 root_objectid,
+ u64 ref_generation, u64 owner,
+ u64 owner_offset, int del)
+{
+ u64 hash;
+ struct btrfs_key key;
+ struct btrfs_key found_key;
+ struct btrfs_extent_ref ref;
+ struct extent_buffer *leaf;
+ struct btrfs_extent_ref *disk_ref;
+ int ret;
+ int ret2;
+
+ btrfs_set_stack_ref_root(&ref, root_objectid);
+ btrfs_set_stack_ref_generation(&ref, ref_generation);
+ btrfs_set_stack_ref_objectid(&ref, owner);
+ btrfs_set_stack_ref_offset(&ref, owner_offset);
+
+ hash = hash_extent_ref(root_objectid, ref_generation, owner,
+ owner_offset);
+ key.offset = hash;
+ key.objectid = bytenr;
+ key.type = BTRFS_EXTENT_REF_KEY;
+
+ while (1) {
+ ret = btrfs_search_slot(trans, root, &key, path,
+ del ? -1 : 0, del);
+ if (ret < 0)
+ goto out;
+ leaf = path->nodes[0];
+ if (ret != 0) {
+ u32 nritems = btrfs_header_nritems(leaf);
+ if (path->slots[0] >= nritems) {
+ ret2 = btrfs_next_leaf(root, path);
+ if (ret2)
+ goto out;
+ leaf = path->nodes[0];
+ }
+ btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
+ if (found_key.objectid != bytenr ||
+ found_key.type != BTRFS_EXTENT_REF_KEY)
+ goto out;
+ key.offset = found_key.offset;
+ if (del) {
+ btrfs_release_path(root, path);
+ continue;
+ }
+ }
+ disk_ref = btrfs_item_ptr(path->nodes[0],
+ path->slots[0],
+ struct btrfs_extent_ref);
+ if (match_extent_ref(path->nodes[0], disk_ref, &ref)) {
+ ret = 0;
+ goto out;
+ }
+ btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
+ key.offset = found_key.offset + 1;
+ btrfs_release_path(root, path);
+ }
+out:
+ return ret;
+}
+
+/*
+ * Back reference rules. Back refs have three main goals:
+ *
+ * 1) differentiate between all holders of references to an extent so that
+ * when a reference is dropped we can make sure it was a valid reference
+ * before freeing the extent.
+ *
+ * 2) Provide enough information to quickly find the holders of an extent
+ * if we notice a given block is corrupted or bad.
+ *
+ * 3) Make it easy to migrate blocks for FS shrinking or storage pool
+ * maintenance. This is actually the same as #2, but with a slightly
+ * different use case.
+ *
+ * File extents can be referenced by:
+ *
+ * - multiple snapshots, subvolumes, or different generations in one subvol
+ * - different files inside a single subvolume (in theory, not implemented yet)
+ * - different offsets inside a file (bookend extents in file.c)
+ *
+ * The extent ref structure has fields for:
+ *
+ * - Objectid of the subvolume root
+ * - Generation number of the tree holding the reference
+ * - objectid of the file holding the reference
+ * - offset in the file corresponding to the key holding the reference
+ *
+ * When a file extent is allocated the fields are filled in:
+ * (root_key.objectid, trans->transid, inode objectid, offset in file)
+ *
+ * When a leaf is cow'd new references are added for every file extent found
+ * in the leaf. It looks the same as the create case, but trans->transid
+ * will be different when the block is cow'd.
+ *
+ * (root_key.objectid, trans->transid, inode objectid, offset in file)
+ *
+ * When a file extent is removed either during snapshot deletion or file
+ * truncation, the corresponding back reference is found
+ * by searching for:
+ *
+ * (btrfs_header_owner(leaf), btrfs_header_generation(leaf),
+ * inode objectid, offset in file)
+ *
+ * Btree extents can be referenced by:
+ *
+ * - Different subvolumes
+ * - Different generations of the same subvolume
+ *
+ * Storing sufficient information for a full reverse mapping of a btree
+ * block would require storing the lowest key of the block in the backref,
+ * and it would require updating that lowest key either before write out or
+ * every time it changed. Instead, the objectid of the lowest key is stored
+ * along with the level of the tree block. This provides a hint
+ * about where in the btree the block can be found. Searches through the
+ * btree only need to look for a pointer to that block, so they stop one
+ * level higher than the level recorded in the backref.
+ *
+ * Some btrees do not do reference counting on their extents. These
+ * include the extent tree and the tree of tree roots. Backrefs for these
+ * trees always have a generation of zero.
+ *
+ * When a tree block is created, back references are inserted:
+ *
+ * (root->root_key.objectid, trans->transid or zero, level, lowest_key_objectid)
+ *
+ * When a tree block is cow'd in a reference counted root,
+ * new back references are added for all the blocks it points to.
+ * These are of the form (trans->transid will have increased since creation):
+ *
+ * (root->root_key.objectid, trans->transid, level, lowest_key_objectid)
+ *
+ * Because the lowest_key_objectid and the level are just hints
+ * they are not used when backrefs are deleted. When a backref is deleted:
+ *
+ * if backref was for a tree root:
+ * root_objectid = root->root_key.objectid
+ * else
+ * root_objectid = btrfs_header_owner(parent)
+ *
+ * (root_objectid, btrfs_header_generation(parent) or zero, 0, 0)
+ *
+ * Back Reference Key hashing:
+ *
+ * Back references have four fields, each 64 bits long. Unfortunately,
+ * This is hashed into a single 64 bit number and placed into the key offset.
+ * The key objectid corresponds to the first byte in the extent, and the
+ * key type is set to BTRFS_EXTENT_REF_KEY
+ */
+int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, u64 bytenr,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner, u64 owner_offset)
+{
+ u64 hash;
+ struct btrfs_key key;
+ struct btrfs_extent_ref ref;
+ struct btrfs_extent_ref *disk_ref;
+ int ret;
+
+ btrfs_set_stack_ref_root(&ref, root_objectid);
+ btrfs_set_stack_ref_generation(&ref, ref_generation);
+ btrfs_set_stack_ref_objectid(&ref, owner);
+ btrfs_set_stack_ref_offset(&ref, owner_offset);
+
+ hash = hash_extent_ref(root_objectid, ref_generation, owner,
+ owner_offset);
+ key.offset = hash;
+ key.objectid = bytenr;
+ key.type = BTRFS_EXTENT_REF_KEY;
+
+ ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(ref));
+ while (ret == -EEXIST) {
+ disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
+ struct btrfs_extent_ref);
+ if (match_extent_ref(path->nodes[0], disk_ref, &ref))
+ goto out;
+ key.offset++;
+ btrfs_release_path(root, path);
+ ret = btrfs_insert_empty_item(trans, root, path, &key,
+ sizeof(ref));
+ }
+ if (ret)
+ goto out;
+ disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
+ struct btrfs_extent_ref);
+ write_extent_buffer(path->nodes[0], &ref, (unsigned long)disk_ref,
+ sizeof(ref));
+ btrfs_mark_buffer_dirty(path->nodes[0]);
+out:
+ btrfs_release_path(root, path);
+ return ret;
+}
+
+static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
- u64 bytenr, u64 num_bytes)
+ u64 bytenr, u64 num_bytes,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner, u64 owner_offset)
{
struct btrfs_path *path;
int ret;
if (!path)
return -ENOMEM;
+ path->reada = 1;
key.objectid = bytenr;
btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
key.offset = num_bytes;
btrfs_mark_buffer_dirty(path->nodes[0]);
btrfs_release_path(root->fs_info->extent_root, path);
- btrfs_free_path(path);
+
+ path->reada = 1;
+ ret = btrfs_insert_extent_backref(trans, root->fs_info->extent_root,
+ path, bytenr, root_objectid,
+ ref_generation, owner, owner_offset);
+ BUG_ON(ret);
finish_current_insert(trans, root->fs_info->extent_root);
del_pending_extents(trans, root->fs_info->extent_root);
+
+ btrfs_free_path(path);
return 0;
}
+int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 bytenr, u64 num_bytes,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner, u64 owner_offset)
+{
+ int ret;
+
+ mutex_lock(&root->fs_info->alloc_mutex);
+ ret = __btrfs_inc_extent_ref(trans, root, bytenr, num_bytes,
+ root_objectid, ref_generation,
+ owner, owner_offset);
+ mutex_unlock(&root->fs_info->alloc_mutex);
+ return ret;
+}
+
int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
WARN_ON(num_bytes < root->sectorsize);
path = btrfs_alloc_path();
+ path->reada = 1;
key.objectid = bytenr;
key.offset = num_bytes;
btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
return 0;
}
-int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
- struct btrfs_root *root)
+u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
+ struct btrfs_path *count_path,
+ u64 expected_owner,
+ u64 first_extent)
{
- return btrfs_inc_extent_ref(trans, root, root->node->start,
- root->node->len);
+ struct btrfs_root *extent_root = root->fs_info->extent_root;
+ struct btrfs_path *path;
+ u64 bytenr;
+ u64 found_objectid;
+ u64 found_owner;
+ u64 root_objectid = root->root_key.objectid;
+ u32 total_count = 0;
+ u32 extent_refs;
+ u32 cur_count;
+ u32 nritems;
+ int ret;
+ struct btrfs_key key;
+ struct btrfs_key found_key;
+ struct extent_buffer *l;
+ struct btrfs_extent_item *item;
+ struct btrfs_extent_ref *ref_item;
+ int level = -1;
+
+ /* FIXME, needs locking */
+ BUG();
+
+ mutex_lock(&root->fs_info->alloc_mutex);
+ path = btrfs_alloc_path();
+again:
+ if (level == -1)
+ bytenr = first_extent;
+ else
+ bytenr = count_path->nodes[level]->start;
+
+ cur_count = 0;
+ key.objectid = bytenr;
+ key.offset = 0;
+
+ btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
+ ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
+ if (ret < 0)
+ goto out;
+ BUG_ON(ret == 0);
+
+ l = path->nodes[0];
+ btrfs_item_key_to_cpu(l, &found_key, path->slots[0]);
+
+ if (found_key.objectid != bytenr ||
+ found_key.type != BTRFS_EXTENT_ITEM_KEY) {
+ goto out;
+ }
+
+ item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item);
+ extent_refs = btrfs_extent_refs(l, item);
+ while (1) {
+ l = path->nodes[0];
+ nritems = btrfs_header_nritems(l);
+ if (path->slots[0] >= nritems) {
+ ret = btrfs_next_leaf(extent_root, path);
+ if (ret == 0)
+ continue;
+ break;
+ }
+ btrfs_item_key_to_cpu(l, &found_key, path->slots[0]);
+ if (found_key.objectid != bytenr)
+ break;
+
+ if (found_key.type != BTRFS_EXTENT_REF_KEY) {
+ path->slots[0]++;
+ continue;
+ }
+
+ cur_count++;
+ ref_item = btrfs_item_ptr(l, path->slots[0],
+ struct btrfs_extent_ref);
+ found_objectid = btrfs_ref_root(l, ref_item);
+
+ if (found_objectid != root_objectid) {
+ total_count = 2;
+ goto out;
+ }
+ if (level == -1) {
+ found_owner = btrfs_ref_objectid(l, ref_item);
+ if (found_owner != expected_owner) {
+ total_count = 2;
+ goto out;
+ }
+ /*
+ * nasty. we don't count a reference held by
+ * the running transaction. This allows nodatacow
+ * to avoid cow most of the time
+ */
+ if (found_owner >= BTRFS_FIRST_FREE_OBJECTID &&
+ btrfs_ref_generation(l, ref_item) ==
+ root->fs_info->generation) {
+ extent_refs--;
+ }
+ }
+ total_count = 1;
+ path->slots[0]++;
+ }
+ /*
+ * if there is more than one reference against a data extent,
+ * we have to assume the other ref is another snapshot
+ */
+ if (level == -1 && extent_refs > 1) {
+ total_count = 2;
+ goto out;
+ }
+ if (cur_count == 0) {
+ total_count = 0;
+ goto out;
+ }
+ if (level >= 0 && root->node == count_path->nodes[level])
+ goto out;
+ level++;
+ btrfs_release_path(root, path);
+ goto again;
+
+out:
+ btrfs_free_path(path);
+ mutex_unlock(&root->fs_info->alloc_mutex);
+ return total_count;
}
int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
int level;
int ret;
int faili;
- int err;
if (!root->ref_cows)
return 0;
level = btrfs_header_level(buf);
nritems = btrfs_header_nritems(buf);
for (i = 0; i < nritems; i++) {
+ cond_resched();
if (level == 0) {
u64 disk_bytenr;
btrfs_item_key_to_cpu(buf, &key, i);
disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi);
if (disk_bytenr == 0)
continue;
- ret = btrfs_inc_extent_ref(trans, root, disk_bytenr,
- btrfs_file_extent_disk_num_bytes(buf, fi));
+
+ mutex_lock(&root->fs_info->alloc_mutex);
+ ret = __btrfs_inc_extent_ref(trans, root, disk_bytenr,
+ btrfs_file_extent_disk_num_bytes(buf, fi),
+ root->root_key.objectid, trans->transid,
+ key.objectid, key.offset);
+ mutex_unlock(&root->fs_info->alloc_mutex);
if (ret) {
faili = i;
+ WARN_ON(1);
goto fail;
}
} else {
bytenr = btrfs_node_blockptr(buf, i);
- ret = btrfs_inc_extent_ref(trans, root, bytenr,
- btrfs_level_size(root, level - 1));
+ btrfs_node_key_to_cpu(buf, &key, i);
+
+ mutex_lock(&root->fs_info->alloc_mutex);
+ ret = __btrfs_inc_extent_ref(trans, root, bytenr,
+ btrfs_level_size(root, level - 1),
+ root->root_key.objectid,
+ trans->transid,
+ level - 1, key.objectid);
+ mutex_unlock(&root->fs_info->alloc_mutex);
if (ret) {
faili = i;
+ WARN_ON(1);
goto fail;
}
}
return 0;
fail:
WARN_ON(1);
+#if 0
for (i =0; i < faili; i++) {
if (level == 0) {
u64 disk_bytenr;
BUG_ON(err);
}
}
+#endif
return ret;
}
int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
- struct extent_map_tree *block_group_cache;
+ struct extent_io_tree *block_group_cache;
struct btrfs_block_group_cache *cache;
int ret;
int err = 0;
if (!path)
return -ENOMEM;
+ mutex_lock(&root->fs_info->alloc_mutex);
while(1) {
ret = find_first_extent_bit(block_group_cache, last,
&start, &end, BLOCK_GROUP_DIRTY);
ret = get_state_private(block_group_cache, start, &ptr);
if (ret)
break;
-
cache = (struct btrfs_block_group_cache *)(unsigned long)ptr;
err = write_one_cache_group(trans, root,
path, cache);
BLOCK_GROUP_DIRTY, GFP_NOFS);
}
btrfs_free_path(path);
+ mutex_unlock(&root->fs_info->alloc_mutex);
return werr;
}
+static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info,
+ u64 flags)
+{
+ struct list_head *head = &info->space_info;
+ struct list_head *cur;
+ struct btrfs_space_info *found;
+ list_for_each(cur, head) {
+ found = list_entry(cur, struct btrfs_space_info, list);
+ if (found->flags == flags)
+ return found;
+ }
+ return NULL;
+
+}
+
+static int update_space_info(struct btrfs_fs_info *info, u64 flags,
+ u64 total_bytes, u64 bytes_used,
+ struct btrfs_space_info **space_info)
+{
+ struct btrfs_space_info *found;
+
+ found = __find_space_info(info, flags);
+ if (found) {
+ found->total_bytes += total_bytes;
+ found->bytes_used += bytes_used;
+ found->full = 0;
+ WARN_ON(found->total_bytes < found->bytes_used);
+ *space_info = found;
+ return 0;
+ }
+ found = kmalloc(sizeof(*found), GFP_NOFS);
+ if (!found)
+ return -ENOMEM;
+
+ list_add(&found->list, &info->space_info);
+ found->flags = flags;
+ found->total_bytes = total_bytes;
+ found->bytes_used = bytes_used;
+ found->bytes_pinned = 0;
+ found->full = 0;
+ found->force_alloc = 0;
+ *space_info = found;
+ return 0;
+}
+
+static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags)
+{
+ u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 |
+ BTRFS_BLOCK_GROUP_RAID1 |
+ BTRFS_BLOCK_GROUP_RAID10 |
+ BTRFS_BLOCK_GROUP_DUP);
+ if (extra_flags) {
+ if (flags & BTRFS_BLOCK_GROUP_DATA)
+ fs_info->avail_data_alloc_bits |= extra_flags;
+ if (flags & BTRFS_BLOCK_GROUP_METADATA)
+ fs_info->avail_metadata_alloc_bits |= extra_flags;
+ if (flags & BTRFS_BLOCK_GROUP_SYSTEM)
+ fs_info->avail_system_alloc_bits |= extra_flags;
+ }
+}
+
+static u64 reduce_alloc_profile(struct btrfs_root *root, u64 flags)
+{
+ u64 num_devices = root->fs_info->fs_devices->num_devices;
+
+ if (num_devices == 1)
+ flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0);
+ if (num_devices < 4)
+ flags &= ~BTRFS_BLOCK_GROUP_RAID10;
+
+ if ((flags & BTRFS_BLOCK_GROUP_DUP) &&
+ (flags & (BTRFS_BLOCK_GROUP_RAID1 |
+ BTRFS_BLOCK_GROUP_RAID10))) {
+ flags &= ~BTRFS_BLOCK_GROUP_DUP;
+ }
+
+ if ((flags & BTRFS_BLOCK_GROUP_RAID1) &&
+ (flags & BTRFS_BLOCK_GROUP_RAID10)) {
+ flags &= ~BTRFS_BLOCK_GROUP_RAID1;
+ }
+
+ if ((flags & BTRFS_BLOCK_GROUP_RAID0) &&
+ ((flags & BTRFS_BLOCK_GROUP_RAID1) |
+ (flags & BTRFS_BLOCK_GROUP_RAID10) |
+ (flags & BTRFS_BLOCK_GROUP_DUP)))
+ flags &= ~BTRFS_BLOCK_GROUP_RAID0;
+ return flags;
+}
+
+static int do_chunk_alloc(struct btrfs_trans_handle *trans,
+ struct btrfs_root *extent_root, u64 alloc_bytes,
+ u64 flags, int force)
+{
+ struct btrfs_space_info *space_info;
+ u64 thresh;
+ u64 start;
+ u64 num_bytes;
+ int ret;
+
+ flags = reduce_alloc_profile(extent_root, flags);
+
+ space_info = __find_space_info(extent_root->fs_info, flags);
+ if (!space_info) {
+ ret = update_space_info(extent_root->fs_info, flags,
+ 0, 0, &space_info);
+ BUG_ON(ret);
+ }
+ BUG_ON(!space_info);
+
+ if (space_info->force_alloc) {
+ force = 1;
+ space_info->force_alloc = 0;
+ }
+ if (space_info->full)
+ goto out;
+
+ thresh = div_factor(space_info->total_bytes, 6);
+ if (!force &&
+ (space_info->bytes_used + space_info->bytes_pinned + alloc_bytes) <
+ thresh)
+ goto out;
+
+ mutex_lock(&extent_root->fs_info->chunk_mutex);
+ ret = btrfs_alloc_chunk(trans, extent_root, &start, &num_bytes, flags);
+ if (ret == -ENOSPC) {
+printk("space info full %Lu\n", flags);
+ space_info->full = 1;
+ goto out_unlock;
+ }
+ BUG_ON(ret);
+
+ ret = btrfs_make_block_group(trans, extent_root, 0, flags,
+ BTRFS_FIRST_CHUNK_TREE_OBJECTID, start, num_bytes);
+ BUG_ON(ret);
+out_unlock:
+ mutex_unlock(&extent_root->fs_info->chunk_mutex);
+out:
+ return 0;
+}
+
static int update_block_group(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 bytenr, u64 num_bytes, int alloc,
- int mark_free, int data)
+ int mark_free)
{
struct btrfs_block_group_cache *cache;
struct btrfs_fs_info *info = root->fs_info;
u64 start;
u64 end;
+ WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex));
while(total) {
cache = btrfs_lookup_block_group(info, bytenr);
if (!cache) {
set_extent_bits(&info->block_group_cache, start, end,
BLOCK_GROUP_DIRTY, GFP_NOFS);
+ spin_lock(&cache->lock);
old_val = btrfs_block_group_used(&cache->item);
num_bytes = min(total, cache->key.offset - byte_in_group);
if (alloc) {
- if (cache->data != data &&
- old_val < (cache->key.offset >> 1)) {
- int bit_to_clear;
- int bit_to_set;
- cache->data = data;
- if (data) {
- bit_to_clear = BLOCK_GROUP_METADATA;
- bit_to_set = BLOCK_GROUP_DATA;
- cache->item.flags &=
- ~BTRFS_BLOCK_GROUP_MIXED;
- cache->item.flags |=
- BTRFS_BLOCK_GROUP_DATA;
- } else {
- bit_to_clear = BLOCK_GROUP_DATA;
- bit_to_set = BLOCK_GROUP_METADATA;
- cache->item.flags &=
- ~BTRFS_BLOCK_GROUP_MIXED;
- cache->item.flags &=
- ~BTRFS_BLOCK_GROUP_DATA;
- }
- clear_extent_bits(&info->block_group_cache,
- start, end, bit_to_clear,
- GFP_NOFS);
- set_extent_bits(&info->block_group_cache,
- start, end, bit_to_set,
- GFP_NOFS);
- } else if (cache->data != data &&
- cache->data != BTRFS_BLOCK_GROUP_MIXED) {
- cache->data = BTRFS_BLOCK_GROUP_MIXED;
- set_extent_bits(&info->block_group_cache,
- start, end,
- BLOCK_GROUP_DATA |
- BLOCK_GROUP_METADATA,
- GFP_NOFS);
- }
old_val += num_bytes;
+ cache->space_info->bytes_used += num_bytes;
+ btrfs_set_block_group_used(&cache->item, old_val);
+ spin_unlock(&cache->lock);
} else {
old_val -= num_bytes;
+ cache->space_info->bytes_used -= num_bytes;
+ btrfs_set_block_group_used(&cache->item, old_val);
+ spin_unlock(&cache->lock);
if (mark_free) {
set_extent_dirty(&info->free_space_cache,
bytenr, bytenr + num_bytes - 1,
GFP_NOFS);
}
}
- btrfs_set_block_group_used(&cache->item, old_val);
total -= num_bytes;
bytenr += num_bytes;
}
return 0;
}
+
+static u64 first_logical_byte(struct btrfs_root *root, u64 search_start)
+{
+ u64 start;
+ u64 end;
+ int ret;
+ ret = find_first_extent_bit(&root->fs_info->block_group_cache,
+ search_start, &start, &end,
+ BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA |
+ BLOCK_GROUP_SYSTEM);
+ if (ret)
+ return 0;
+ return start;
+}
+
+
static int update_pinned_extents(struct btrfs_root *root,
u64 bytenr, u64 num, int pin)
{
struct btrfs_block_group_cache *cache;
struct btrfs_fs_info *fs_info = root->fs_info;
+ WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex));
if (pin) {
set_extent_dirty(&fs_info->pinned_extents,
bytenr, bytenr + num - 1, GFP_NOFS);
}
while (num > 0) {
cache = btrfs_lookup_block_group(fs_info, bytenr);
- WARN_ON(!cache);
- len = min(num, cache->key.offset -
- (bytenr - cache->key.objectid));
+ if (!cache) {
+ u64 first = first_logical_byte(root, bytenr);
+ WARN_ON(first < bytenr);
+ len = min(first - bytenr, num);
+ } else {
+ len = min(num, cache->key.offset -
+ (bytenr - cache->key.objectid));
+ }
if (pin) {
- cache->pinned += len;
+ if (cache) {
+ spin_lock(&cache->lock);
+ cache->pinned += len;
+ cache->space_info->bytes_pinned += len;
+ spin_unlock(&cache->lock);
+ }
fs_info->total_pinned += len;
} else {
- cache->pinned -= len;
+ if (cache) {
+ spin_lock(&cache->lock);
+ cache->pinned -= len;
+ cache->space_info->bytes_pinned -= len;
+ spin_unlock(&cache->lock);
+ }
fs_info->total_pinned -= len;
}
bytenr += len;
return 0;
}
-int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy)
+int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy)
{
u64 last = 0;
u64 start;
u64 end;
- struct extent_map_tree *pinned_extents = &root->fs_info->pinned_extents;
+ struct extent_io_tree *pinned_extents = &root->fs_info->pinned_extents;
int ret;
while(1) {
int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
- struct extent_map_tree *unpin)
+ struct extent_io_tree *unpin)
{
u64 start;
u64 end;
int ret;
- struct extent_map_tree *free_space_cache;
+ struct extent_io_tree *free_space_cache;
free_space_cache = &root->fs_info->free_space_cache;
+ mutex_lock(&root->fs_info->alloc_mutex);
while(1) {
ret = find_first_extent_bit(unpin, 0, &start, &end,
EXTENT_DIRTY);
update_pinned_extents(root, start, end + 1 - start, 0);
clear_extent_dirty(unpin, start, end, GFP_NOFS);
set_extent_dirty(free_space_cache, start, end, GFP_NOFS);
+ if (need_resched()) {
+ mutex_unlock(&root->fs_info->alloc_mutex);
+ cond_resched();
+ mutex_lock(&root->fs_info->alloc_mutex);
+ }
}
+ mutex_unlock(&root->fs_info->alloc_mutex);
return 0;
}
-static int finish_current_insert(struct btrfs_trans_handle *trans, struct
- btrfs_root *extent_root)
+static int finish_current_insert(struct btrfs_trans_handle *trans,
+ struct btrfs_root *extent_root)
{
+ u64 start;
+ u64 end;
+ struct btrfs_fs_info *info = extent_root->fs_info;
+ struct extent_buffer *eb;
+ struct btrfs_path *path;
struct btrfs_key ins;
+ struct btrfs_disk_key first;
struct btrfs_extent_item extent_item;
int ret;
+ int level;
int err = 0;
- u64 start;
- u64 end;
- struct btrfs_fs_info *info = extent_root->fs_info;
+ WARN_ON(!mutex_is_locked(&extent_root->fs_info->alloc_mutex));
btrfs_set_stack_extent_refs(&extent_item, 1);
btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY);
- btrfs_set_stack_extent_owner(&extent_item,
- extent_root->root_key.objectid);
+ path = btrfs_alloc_path();
while(1) {
ret = find_first_extent_bit(&info->extent_ins, 0, &start,
&extent_item, sizeof(extent_item));
clear_extent_bits(&info->extent_ins, start, end, EXTENT_LOCKED,
GFP_NOFS);
+
+ eb = btrfs_find_tree_block(extent_root, ins.objectid,
+ ins.offset);
+
+ if (!btrfs_buffer_uptodate(eb, trans->transid)) {
+ mutex_unlock(&extent_root->fs_info->alloc_mutex);
+ btrfs_read_buffer(eb, trans->transid);
+ mutex_lock(&extent_root->fs_info->alloc_mutex);
+ }
+
+ btrfs_tree_lock(eb);
+ level = btrfs_header_level(eb);
+ if (level == 0) {
+ btrfs_item_key(eb, &first, 0);
+ } else {
+ btrfs_node_key(eb, &first, 0);
+ }
+ btrfs_tree_unlock(eb);
+ free_extent_buffer(eb);
+ /*
+ * the first key is just a hint, so the race we've created
+ * against reading it is fine
+ */
+ err = btrfs_insert_extent_backref(trans, extent_root, path,
+ start, extent_root->root_key.objectid,
+ 0, level,
+ btrfs_disk_key_objectid(&first));
+ BUG_ON(err);
+ if (need_resched()) {
+ mutex_unlock(&extent_root->fs_info->alloc_mutex);
+ cond_resched();
+ mutex_lock(&extent_root->fs_info->alloc_mutex);
+ }
}
+ btrfs_free_path(path);
return 0;
}
int pending)
{
int err = 0;
- struct extent_buffer *buf;
+ WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex));
if (!pending) {
+ struct extent_buffer *buf;
buf = btrfs_find_tree_block(root, bytenr, num_bytes);
if (buf) {
- if (btrfs_buffer_uptodate(buf)) {
+ if (btrfs_try_tree_lock(buf) &&
+ btrfs_buffer_uptodate(buf, 0)) {
u64 transid =
root->fs_info->running_transaction->transid;
- if (btrfs_header_generation(buf) == transid) {
+ u64 header_transid =
+ btrfs_header_generation(buf);
+ if (header_transid == transid &&
+ !btrfs_header_flag(buf,
+ BTRFS_HEADER_FLAG_WRITTEN)) {
+ clean_tree_block(NULL, root, buf);
+ btrfs_tree_unlock(buf);
free_extent_buffer(buf);
return 1;
}
+ btrfs_tree_unlock(buf);
}
free_extent_buffer(buf);
}
* remove an extent from the root, returns 0 on success
*/
static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, u64 bytenr, u64 num_bytes, int pin,
+ *root, u64 bytenr, u64 num_bytes,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner_objectid, u64 owner_offset, int pin,
int mark_free)
{
struct btrfs_path *path;
struct btrfs_root *extent_root = info->extent_root;
struct extent_buffer *leaf;
int ret;
+ int extent_slot = 0;
+ int found_extent = 0;
+ int num_to_del = 1;
struct btrfs_extent_item *ei;
u32 refs;
+ WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex));
key.objectid = bytenr;
btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
key.offset = num_bytes;
-
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
- ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1);
- if (ret < 0)
- return ret;
- BUG_ON(ret);
+ path->reada = 1;
+ ret = lookup_extent_backref(trans, extent_root, path,
+ bytenr, root_objectid,
+ ref_generation,
+ owner_objectid, owner_offset, 1);
+ if (ret == 0) {
+ struct btrfs_key found_key;
+ extent_slot = path->slots[0];
+ while(extent_slot > 0) {
+ extent_slot--;
+ btrfs_item_key_to_cpu(path->nodes[0], &found_key,
+ extent_slot);
+ if (found_key.objectid != bytenr)
+ break;
+ if (found_key.type == BTRFS_EXTENT_ITEM_KEY &&
+ found_key.offset == num_bytes) {
+ found_extent = 1;
+ break;
+ }
+ if (path->slots[0] - extent_slot > 5)
+ break;
+ }
+ if (!found_extent)
+ ret = btrfs_del_item(trans, extent_root, path);
+ } else {
+ btrfs_print_leaf(extent_root, path->nodes[0]);
+ WARN_ON(1);
+ printk("Unable to find ref byte nr %Lu root %Lu "
+ " gen %Lu owner %Lu offset %Lu\n", bytenr,
+ root_objectid, ref_generation, owner_objectid,
+ owner_offset);
+ }
+ if (!found_extent) {
+ btrfs_release_path(extent_root, path);
+ ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1);
+ if (ret < 0)
+ return ret;
+ BUG_ON(ret);
+ extent_slot = path->slots[0];
+ }
leaf = path->nodes[0];
- ei = btrfs_item_ptr(leaf, path->slots[0],
+ ei = btrfs_item_ptr(leaf, extent_slot,
struct btrfs_extent_item);
refs = btrfs_extent_refs(leaf, ei);
BUG_ON(refs == 0);
refs -= 1;
btrfs_set_extent_refs(leaf, ei, refs);
+
btrfs_mark_buffer_dirty(leaf);
+ if (refs == 0 && found_extent && path->slots[0] == extent_slot + 1) {
+ /* if the back ref and the extent are next to each other
+ * they get deleted below in one shot
+ */
+ path->slots[0] = extent_slot;
+ num_to_del = 2;
+ } else if (found_extent) {
+ /* otherwise delete the extent back ref */
+ ret = btrfs_del_item(trans, extent_root, path);
+ BUG_ON(ret);
+ /* if refs are 0, we need to setup the path for deletion */
+ if (refs == 0) {
+ btrfs_release_path(extent_root, path);
+ ret = btrfs_search_slot(trans, extent_root, &key, path,
+ -1, 1);
+ if (ret < 0)
+ return ret;
+ BUG_ON(ret);
+ }
+ }
+
if (refs == 0) {
u64 super_used;
u64 root_used;
}
/* block accounting for super block */
+ spin_lock_irq(&info->delalloc_lock);
super_used = btrfs_super_bytes_used(&info->super_copy);
btrfs_set_super_bytes_used(&info->super_copy,
super_used - num_bytes);
+ spin_unlock_irq(&info->delalloc_lock);
/* block accounting for root item */
root_used = btrfs_root_used(&root->root_item);
btrfs_set_root_used(&root->root_item,
root_used - num_bytes);
-
- ret = btrfs_del_item(trans, extent_root, path);
+ ret = btrfs_del_items(trans, extent_root, path, path->slots[0],
+ num_to_del);
if (ret) {
return ret;
}
ret = update_block_group(trans, root, bytenr, num_bytes, 0,
- mark_free, 0);
+ mark_free);
BUG_ON(ret);
}
btrfs_free_path(path);
int err = 0;
u64 start;
u64 end;
- struct extent_map_tree *pending_del;
- struct extent_map_tree *pinned_extents;
+ struct extent_io_tree *pending_del;
+ struct extent_io_tree *pinned_extents;
+ WARN_ON(!mutex_is_locked(&extent_root->fs_info->alloc_mutex));
pending_del = &extent_root->fs_info->pending_del;
pinned_extents = &extent_root->fs_info->pinned_extents;
EXTENT_LOCKED);
if (ret)
break;
- update_pinned_extents(extent_root, start, end + 1 - start, 1);
clear_extent_bits(pending_del, start, end, EXTENT_LOCKED,
GFP_NOFS);
- ret = __free_extent(trans, extent_root,
- start, end + 1 - start, 0, 0);
+ if (!test_range_bit(&extent_root->fs_info->extent_ins,
+ start, end, EXTENT_LOCKED, 0)) {
+ update_pinned_extents(extent_root, start,
+ end + 1 - start, 1);
+ ret = __free_extent(trans, extent_root,
+ start, end + 1 - start,
+ extent_root->root_key.objectid,
+ 0, 0, 0, 0, 0);
+ } else {
+ clear_extent_bits(&extent_root->fs_info->extent_ins,
+ start, end, EXTENT_LOCKED, GFP_NOFS);
+ }
if (ret)
err = ret;
+
+ if (need_resched()) {
+ mutex_unlock(&extent_root->fs_info->alloc_mutex);
+ cond_resched();
+ mutex_lock(&extent_root->fs_info->alloc_mutex);
+ }
}
return err;
}
/*
* remove an extent from the root, returns 0 on success
*/
-int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, u64 bytenr, u64 num_bytes, int pin)
+static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 bytenr,
+ u64 num_bytes, u64 root_objectid,
+ u64 ref_generation, u64 owner_objectid,
+ u64 owner_offset, int pin)
{
struct btrfs_root *extent_root = root->fs_info->extent_root;
int pending_ret;
int ret;
WARN_ON(num_bytes < root->sectorsize);
+ if (!root->ref_cows)
+ ref_generation = 0;
+
if (root == extent_root) {
pin_down_bytes(root, bytenr, num_bytes, 1);
return 0;
}
- ret = __free_extent(trans, root, bytenr, num_bytes, pin, pin == 0);
+ ret = __free_extent(trans, root, bytenr, num_bytes, root_objectid,
+ ref_generation, owner_objectid, owner_offset,
+ pin, pin == 0);
+
+ finish_current_insert(trans, root->fs_info->extent_root);
pending_ret = del_pending_extents(trans, root->fs_info->extent_root);
return ret ? ret : pending_ret;
}
+int btrfs_free_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 bytenr,
+ u64 num_bytes, u64 root_objectid,
+ u64 ref_generation, u64 owner_objectid,
+ u64 owner_offset, int pin)
+{
+ int ret;
+
+ maybe_lock_mutex(root);
+ ret = __btrfs_free_extent(trans, root, bytenr, num_bytes,
+ root_objectid, ref_generation,
+ owner_objectid, owner_offset, pin);
+ maybe_unlock_mutex(root);
+ return ret;
+}
+
+static u64 stripe_align(struct btrfs_root *root, u64 val)
+{
+ u64 mask = ((u64)root->stripesize - 1);
+ u64 ret = (val + mask) & ~mask;
+ return ret;
+}
+
/*
* walks the btree of allocated extents and find a hole of a given size.
* The key ins is changed to record the hole:
* ins->offset == number of blocks
* Any available blocks before search_start are skipped.
*/
-static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
- *orig_root, u64 num_bytes, u64 empty_size,
- u64 search_start, u64 search_end, u64 hint_byte,
- struct btrfs_key *ins, u64 exclude_start,
- u64 exclude_nr, int data)
+static int noinline find_free_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *orig_root,
+ u64 num_bytes, u64 empty_size,
+ u64 search_start, u64 search_end,
+ u64 hint_byte, struct btrfs_key *ins,
+ u64 exclude_start, u64 exclude_nr,
+ int data)
{
- struct btrfs_path *path;
- struct btrfs_key key;
int ret;
- u64 hole_size = 0;
- int slot = 0;
- u64 last_byte = 0;
- u64 orig_search_start = search_start;
- int start_found;
- struct extent_buffer *l;
+ u64 orig_search_start;
struct btrfs_root * root = orig_root->fs_info->extent_root;
struct btrfs_fs_info *info = root->fs_info;
u64 total_needed = num_bytes;
- int level;
+ u64 *last_ptr = NULL;
struct btrfs_block_group_cache *block_group;
int full_scan = 0;
int wrapped = 0;
- u64 cached_start;
+ int chunk_alloc_done = 0;
+ int empty_cluster = 2 * 1024 * 1024;
+ int allowed_chunk_alloc = 0;
WARN_ON(num_bytes < root->sectorsize);
btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY);
- level = btrfs_header_level(root->node);
+ if (orig_root->ref_cows || empty_size)
+ allowed_chunk_alloc = 1;
+
+ if (data & BTRFS_BLOCK_GROUP_METADATA) {
+ last_ptr = &root->fs_info->last_alloc;
+ empty_cluster = 256 * 1024;
+ }
+
+ if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD)) {
+ last_ptr = &root->fs_info->last_data_alloc;
+ }
- if (num_bytes >= 96 * 1024 * 1024 && hint_byte) {
- data = BTRFS_BLOCK_GROUP_MIXED;
+ if (last_ptr) {
+ if (*last_ptr)
+ hint_byte = *last_ptr;
+ else {
+ empty_size += empty_cluster;
+ }
}
+ search_start = max(search_start, first_logical_byte(root, 0));
+ orig_search_start = search_start;
+
if (search_end == (u64)-1)
search_end = btrfs_super_total_bytes(&info->super_copy);
+
if (hint_byte) {
- block_group = btrfs_lookup_block_group(info, hint_byte);
+ block_group = btrfs_lookup_first_block_group(info, hint_byte);
+ if (!block_group)
+ hint_byte = search_start;
block_group = btrfs_find_block_group(root, block_group,
hint_byte, data, 1);
+ if (last_ptr && *last_ptr == 0 && block_group)
+ hint_byte = block_group->key.objectid;
} else {
block_group = btrfs_find_block_group(root,
- trans->block_group, 0,
- data, 1);
+ trans->block_group,
+ search_start, data, 1);
}
+ search_start = max(search_start, hint_byte);
total_needed += empty_size;
- path = btrfs_alloc_path();
-check_failed:
- search_start = find_search_start(root, &block_group, search_start,
- total_needed, data, full_scan);
- cached_start = search_start;
- btrfs_init_path(path);
- ins->objectid = search_start;
- ins->offset = 0;
- start_found = 0;
- path->reada = 2;
-
- ret = btrfs_search_slot(trans, root, ins, path, 0, 0);
- if (ret < 0)
- goto error;
- if (path->slots[0] > 0) {
- path->slots[0]--;
+check_failed:
+ if (!block_group) {
+ block_group = btrfs_lookup_first_block_group(info,
+ search_start);
+ if (!block_group)
+ block_group = btrfs_lookup_first_block_group(info,
+ orig_search_start);
}
-
- l = path->nodes[0];
- btrfs_item_key_to_cpu(l, &key, path->slots[0]);
-
- /*
- * a rare case, go back one key if we hit a block group item
- * instead of an extent item
- */
- if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY &&
- key.objectid + key.offset >= search_start) {
- ins->objectid = key.objectid;
- ins->offset = key.offset - 1;
- btrfs_release_path(root, path);
- ret = btrfs_search_slot(trans, root, ins, path, 0, 0);
- if (ret < 0)
- goto error;
-
- if (path->slots[0] > 0) {
- path->slots[0]--;
+ if (full_scan && !chunk_alloc_done) {
+ if (allowed_chunk_alloc) {
+ do_chunk_alloc(trans, root,
+ num_bytes + 2 * 1024 * 1024, data, 1);
+ allowed_chunk_alloc = 0;
+ } else if (block_group && block_group_bits(block_group, data)) {
+ block_group->space_info->force_alloc = 1;
}
+ chunk_alloc_done = 1;
}
+ ret = find_search_start(root, &block_group, &search_start,
+ total_needed, data);
+ if (ret == -ENOSPC && last_ptr && *last_ptr) {
+ *last_ptr = 0;
+ block_group = btrfs_lookup_first_block_group(info,
+ orig_search_start);
+ search_start = orig_search_start;
+ ret = find_search_start(root, &block_group, &search_start,
+ total_needed, data);
+ }
+ if (ret == -ENOSPC)
+ goto enospc;
+ if (ret)
+ goto error;
- while (1) {
- l = path->nodes[0];
- slot = path->slots[0];
- if (slot >= btrfs_header_nritems(l)) {
- ret = btrfs_next_leaf(root, path);
- if (ret == 0)
- continue;
- if (ret < 0)
- goto error;
-
- search_start = max(search_start,
- block_group->key.objectid);
- if (!start_found) {
- ins->objectid = search_start;
- ins->offset = search_end - search_start;
- start_found = 1;
- goto check_pending;
- }
- ins->objectid = last_byte > search_start ?
- last_byte : search_start;
- ins->offset = search_end - ins->objectid;
- BUG_ON(ins->objectid >= search_end);
- goto check_pending;
- }
- btrfs_item_key_to_cpu(l, &key, slot);
-
- if (key.objectid >= search_start && key.objectid > last_byte &&
- start_found) {
- if (last_byte < search_start)
- last_byte = search_start;
- hole_size = key.objectid - last_byte;
- if (hole_size >= num_bytes) {
- ins->objectid = last_byte;
- ins->offset = hole_size;
- goto check_pending;
- }
- }
- if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY) {
- if (!start_found) {
- last_byte = key.objectid;
- start_found = 1;
- }
- goto next;
- }
-
-
- start_found = 1;
- last_byte = key.objectid + key.offset;
-
- if (!full_scan && data != BTRFS_BLOCK_GROUP_MIXED &&
- last_byte >= block_group->key.objectid +
- block_group->key.offset) {
- btrfs_release_path(root, path);
- search_start = block_group->key.objectid +
- block_group->key.offset;
- goto new_group;
+ if (last_ptr && *last_ptr && search_start != *last_ptr) {
+ *last_ptr = 0;
+ if (!empty_size) {
+ empty_size += empty_cluster;
+ total_needed += empty_size;
}
-next:
- path->slots[0]++;
- cond_resched();
+ block_group = btrfs_lookup_first_block_group(info,
+ orig_search_start);
+ search_start = orig_search_start;
+ ret = find_search_start(root, &block_group,
+ &search_start, total_needed, data);
+ if (ret == -ENOSPC)
+ goto enospc;
+ if (ret)
+ goto error;
}
-check_pending:
- /* we have to make sure we didn't find an extent that has already
- * been allocated by the map tree or the original allocation
- */
- btrfs_release_path(root, path);
- BUG_ON(ins->objectid < search_start);
+
+ search_start = stripe_align(root, search_start);
+ ins->objectid = search_start;
+ ins->offset = num_bytes;
if (ins->objectid + num_bytes >= search_end)
goto enospc;
- if (!full_scan && data != BTRFS_BLOCK_GROUP_MIXED &&
- ins->objectid + num_bytes > block_group->
- key.objectid + block_group->key.offset) {
+
+ if (ins->objectid + num_bytes >
+ block_group->key.objectid + block_group->key.offset) {
search_start = block_group->key.objectid +
block_group->key.offset;
goto new_group;
}
+
if (test_range_bit(&info->extent_ins, ins->objectid,
ins->objectid + num_bytes -1, EXTENT_LOCKED, 0)) {
search_start = ins->objectid + num_bytes;
goto new_group;
}
+
if (test_range_bit(&info->pinned_extents, ins->objectid,
ins->objectid + num_bytes -1, EXTENT_DIRTY, 0)) {
search_start = ins->objectid + num_bytes;
goto new_group;
}
+
if (exclude_nr > 0 && (ins->objectid + num_bytes > exclude_start &&
ins->objectid < exclude_start + exclude_nr)) {
search_start = exclude_start + exclude_nr;
goto new_group;
}
- if (!data) {
+
+ if (!(data & BTRFS_BLOCK_GROUP_DATA)) {
block_group = btrfs_lookup_block_group(info, ins->objectid);
if (block_group)
trans->block_group = block_group;
}
ins->offset = num_bytes;
- btrfs_free_path(path);
+ if (last_ptr) {
+ *last_ptr = ins->objectid + ins->offset;
+ if (*last_ptr ==
+ btrfs_super_total_bytes(&root->fs_info->super_copy)) {
+ *last_ptr = 0;
+ }
+ }
return 0;
new_group:
} else
wrapped = 1;
}
- block_group = btrfs_lookup_block_group(info, search_start);
+ block_group = btrfs_lookup_first_block_group(info, search_start);
cond_resched();
- if (!full_scan)
- block_group = btrfs_find_block_group(root, block_group,
- search_start, data, 0);
+ block_group = btrfs_find_block_group(root, block_group,
+ search_start, data, 0);
goto check_failed;
error:
- btrfs_release_path(root, path);
- btrfs_free_path(path);
return ret;
}
-/*
- * finds a free extent and does all the dirty work required for allocation
- * returns the key for the extent through ins, and a tree buffer for
- * the first block of the extent through buf.
- *
- * returns 0 if everything worked, non-zero otherwise.
- */
-int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, u64 owner,
- u64 num_bytes, u64 empty_size, u64 hint_byte,
- u64 search_end, struct btrfs_key *ins, int data)
+
+static int __btrfs_reserve_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 num_bytes, u64 min_alloc_size,
+ u64 empty_size, u64 hint_byte,
+ u64 search_end, struct btrfs_key *ins,
+ u64 data)
{
int ret;
- int pending_ret;
- u64 super_used, root_used;
u64 search_start = 0;
+ u64 alloc_profile;
struct btrfs_fs_info *info = root->fs_info;
- struct btrfs_root *extent_root = info->extent_root;
- struct btrfs_extent_item extent_item;
- btrfs_set_stack_extent_refs(&extent_item, 1);
- btrfs_set_stack_extent_owner(&extent_item, owner);
+ if (data) {
+ alloc_profile = info->avail_data_alloc_bits &
+ info->data_alloc_profile;
+ data = BTRFS_BLOCK_GROUP_DATA | alloc_profile;
+ } else if (root == root->fs_info->chunk_root) {
+ alloc_profile = info->avail_system_alloc_bits &
+ info->system_alloc_profile;
+ data = BTRFS_BLOCK_GROUP_SYSTEM | alloc_profile;
+ } else {
+ alloc_profile = info->avail_metadata_alloc_bits &
+ info->metadata_alloc_profile;
+ data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile;
+ }
+again:
+ data = reduce_alloc_profile(root, data);
+ /*
+ * the only place that sets empty_size is btrfs_realloc_node, which
+ * is not called recursively on allocations
+ */
+ if (empty_size || root->ref_cows) {
+ if (!(data & BTRFS_BLOCK_GROUP_METADATA)) {
+ ret = do_chunk_alloc(trans, root->fs_info->extent_root,
+ 2 * 1024 * 1024,
+ BTRFS_BLOCK_GROUP_METADATA |
+ (info->metadata_alloc_profile &
+ info->avail_metadata_alloc_bits), 0);
+ BUG_ON(ret);
+ }
+ ret = do_chunk_alloc(trans, root->fs_info->extent_root,
+ num_bytes + 2 * 1024 * 1024, data, 0);
+ BUG_ON(ret);
+ }
WARN_ON(num_bytes < root->sectorsize);
ret = find_free_extent(trans, root, num_bytes, empty_size,
search_start, search_end, hint_byte, ins,
trans->alloc_exclude_start,
trans->alloc_exclude_nr, data);
- BUG_ON(ret);
- if (ret)
- return ret;
-
- /* block accounting for super block */
- super_used = btrfs_super_bytes_used(&info->super_copy);
- btrfs_set_super_bytes_used(&info->super_copy, super_used + num_bytes);
-
- /* block accounting for root item */
- root_used = btrfs_root_used(&root->root_item);
- btrfs_set_root_used(&root->root_item, root_used + num_bytes);
+ if (ret == -ENOSPC && num_bytes > min_alloc_size) {
+ num_bytes = num_bytes >> 1;
+ num_bytes = max(num_bytes, min_alloc_size);
+ do_chunk_alloc(trans, root->fs_info->extent_root,
+ num_bytes, data, 1);
+ goto again;
+ }
+ if (ret) {
+ printk("allocation failed flags %Lu\n", data);
+ BUG();
+ }
clear_extent_dirty(&root->fs_info->free_space_cache,
ins->objectid, ins->objectid + ins->offset - 1,
GFP_NOFS);
+ return 0;
+}
- if (root == extent_root) {
- set_extent_bits(&root->fs_info->extent_ins, ins->objectid,
- ins->objectid + ins->offset - 1,
- EXTENT_LOCKED, GFP_NOFS);
- WARN_ON(data == 1);
- goto update_block;
- }
+int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 num_bytes, u64 min_alloc_size,
+ u64 empty_size, u64 hint_byte,
+ u64 search_end, struct btrfs_key *ins,
+ u64 data)
+{
+ int ret;
+ maybe_lock_mutex(root);
+ ret = __btrfs_reserve_extent(trans, root, num_bytes, min_alloc_size,
+ empty_size, hint_byte, search_end, ins,
+ data);
+ maybe_unlock_mutex(root);
+ return ret;
+}
- WARN_ON(trans->alloc_exclude_nr);
- trans->alloc_exclude_start = ins->objectid;
- trans->alloc_exclude_nr = ins->offset;
- ret = btrfs_insert_item(trans, extent_root, ins, &extent_item,
- sizeof(extent_item));
+static int __btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner, u64 owner_offset,
+ struct btrfs_key *ins)
+{
+ int ret;
+ int pending_ret;
+ u64 super_used;
+ u64 root_used;
+ u64 num_bytes = ins->offset;
+ u32 sizes[2];
+ struct btrfs_fs_info *info = root->fs_info;
+ struct btrfs_root *extent_root = info->extent_root;
+ struct btrfs_extent_item *extent_item;
+ struct btrfs_extent_ref *ref;
+ struct btrfs_path *path;
+ struct btrfs_key keys[2];
- trans->alloc_exclude_start = 0;
- trans->alloc_exclude_nr = 0;
+ /* block accounting for super block */
+ spin_lock_irq(&info->delalloc_lock);
+ super_used = btrfs_super_bytes_used(&info->super_copy);
+ btrfs_set_super_bytes_used(&info->super_copy, super_used + num_bytes);
+ spin_unlock_irq(&info->delalloc_lock);
+
+ /* block accounting for root item */
+ root_used = btrfs_root_used(&root->root_item);
+ btrfs_set_root_used(&root->root_item, root_used + num_bytes);
+
+ if (root == extent_root) {
+ set_extent_bits(&root->fs_info->extent_ins, ins->objectid,
+ ins->objectid + ins->offset - 1,
+ EXTENT_LOCKED, GFP_NOFS);
+ goto update_block;
+ }
+
+ memcpy(&keys[0], ins, sizeof(*ins));
+ keys[1].offset = hash_extent_ref(root_objectid, ref_generation,
+ owner, owner_offset);
+ keys[1].objectid = ins->objectid;
+ keys[1].type = BTRFS_EXTENT_REF_KEY;
+ sizes[0] = sizeof(*extent_item);
+ sizes[1] = sizeof(*ref);
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+
+ ret = btrfs_insert_empty_items(trans, extent_root, path, keys,
+ sizes, 2);
BUG_ON(ret);
+ extent_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
+ struct btrfs_extent_item);
+ btrfs_set_extent_refs(path->nodes[0], extent_item, 1);
+ ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
+ struct btrfs_extent_ref);
+
+ btrfs_set_ref_root(path->nodes[0], ref, root_objectid);
+ btrfs_set_ref_generation(path->nodes[0], ref, ref_generation);
+ btrfs_set_ref_objectid(path->nodes[0], ref, owner);
+ btrfs_set_ref_offset(path->nodes[0], ref, owner_offset);
+
+ btrfs_mark_buffer_dirty(path->nodes[0]);
+
+ trans->alloc_exclude_start = 0;
+ trans->alloc_exclude_nr = 0;
+ btrfs_free_path(path);
finish_current_insert(trans, extent_root);
pending_ret = del_pending_extents(trans, extent_root);
- if (ret) {
- return ret;
- }
+ if (ret)
+ goto out;
if (pending_ret) {
- return pending_ret;
+ ret = pending_ret;
+ goto out;
}
update_block:
- ret = update_block_group(trans, root, ins->objectid, ins->offset, 1, 0,
- data);
- BUG_ON(ret);
- return 0;
+ ret = update_block_group(trans, root, ins->objectid, ins->offset, 1, 0);
+ if (ret) {
+ printk("update block group failed for %Lu %Lu\n",
+ ins->objectid, ins->offset);
+ BUG();
+ }
+out:
+ return ret;
}
+int btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner, u64 owner_offset,
+ struct btrfs_key *ins)
+{
+ int ret;
+ maybe_lock_mutex(root);
+ ret = __btrfs_alloc_reserved_extent(trans, root, root_objectid,
+ ref_generation, owner,
+ owner_offset, ins);
+ maybe_unlock_mutex(root);
+ return ret;
+}
+/*
+ * finds a free extent and does all the dirty work required for allocation
+ * returns the key for the extent through ins, and a tree buffer for
+ * the first block of the extent through buf.
+ *
+ * returns 0 if everything worked, non-zero otherwise.
+ */
+int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 num_bytes, u64 min_alloc_size,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner, u64 owner_offset,
+ u64 empty_size, u64 hint_byte,
+ u64 search_end, struct btrfs_key *ins, u64 data)
+{
+ int ret;
+
+ maybe_lock_mutex(root);
+
+ ret = __btrfs_reserve_extent(trans, root, num_bytes,
+ min_alloc_size, empty_size, hint_byte,
+ search_end, ins, data);
+ BUG_ON(ret);
+ ret = __btrfs_alloc_reserved_extent(trans, root, root_objectid,
+ ref_generation, owner,
+ owner_offset, ins);
+ BUG_ON(ret);
+
+ maybe_unlock_mutex(root);
+ return ret;
+}
/*
* helper function to allocate a block for a given tree
* returns the tree buffer or NULL.
*/
struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
- u32 blocksize, u64 hint,
+ u32 blocksize,
+ u64 root_objectid,
+ u64 ref_generation,
+ u64 first_objectid,
+ int level,
+ u64 hint,
u64 empty_size)
{
struct btrfs_key ins;
int ret;
struct extent_buffer *buf;
- ret = btrfs_alloc_extent(trans, root, root->root_key.objectid,
- blocksize, empty_size, hint,
+ ret = btrfs_alloc_extent(trans, root, blocksize, blocksize,
+ root_objectid, ref_generation,
+ level, first_objectid, empty_size, hint,
(u64)-1, &ins, 0);
if (ret) {
BUG_ON(ret > 0);
}
buf = btrfs_find_create_tree_block(root, ins.objectid, blocksize);
if (!buf) {
- btrfs_free_extent(trans, root, ins.objectid, blocksize, 0);
+ btrfs_free_extent(trans, root, ins.objectid, blocksize,
+ root->root_key.objectid, ref_generation,
+ 0, 0, 0);
return ERR_PTR(-ENOMEM);
}
+ btrfs_set_header_generation(buf, trans->transid);
+ btrfs_tree_lock(buf);
+ clean_tree_block(trans, root, buf);
btrfs_set_buffer_uptodate(buf);
+
+ if (PageDirty(buf->first_page)) {
+ printk("page %lu dirty\n", buf->first_page->index);
+ WARN_ON(1);
+ }
+
set_extent_dirty(&trans->transaction->dirty_pages, buf->start,
buf->start + buf->len - 1, GFP_NOFS);
- set_extent_bits(&BTRFS_I(root->fs_info->btree_inode)->extent_tree,
- buf->start, buf->start + buf->len - 1,
- EXTENT_CSUM, GFP_NOFS);
- buf->flags |= EXTENT_CSUM;
- btrfs_set_buffer_defrag(buf);
trans->blocks_used++;
return buf;
}
-static int drop_leaf_ref(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, struct extent_buffer *leaf)
+static int noinline drop_leaf_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_buffer *leaf)
{
+ u64 leaf_owner;
+ u64 leaf_generation;
struct btrfs_key key;
struct btrfs_file_extent_item *fi;
int i;
BUG_ON(!btrfs_is_leaf(leaf));
nritems = btrfs_header_nritems(leaf);
+ leaf_owner = btrfs_header_owner(leaf);
+ leaf_generation = btrfs_header_generation(leaf);
+
+ mutex_unlock(&root->fs_info->alloc_mutex);
+
for (i = 0; i < nritems; i++) {
u64 disk_bytenr;
+ cond_resched();
btrfs_item_key_to_cpu(leaf, &key, i);
if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
if (disk_bytenr == 0)
continue;
- ret = btrfs_free_extent(trans, root, disk_bytenr,
- btrfs_file_extent_disk_num_bytes(leaf, fi), 0);
+
+ mutex_lock(&root->fs_info->alloc_mutex);
+ ret = __btrfs_free_extent(trans, root, disk_bytenr,
+ btrfs_file_extent_disk_num_bytes(leaf, fi),
+ leaf_owner, leaf_generation,
+ key.objectid, key.offset, 0);
+ mutex_unlock(&root->fs_info->alloc_mutex);
BUG_ON(ret);
}
+
+ mutex_lock(&root->fs_info->alloc_mutex);
return 0;
}
-static void reada_walk_down(struct btrfs_root *root,
- struct extent_buffer *node)
+static void noinline reada_walk_down(struct btrfs_root *root,
+ struct extent_buffer *node,
+ int slot)
{
- int i;
- u32 nritems;
u64 bytenr;
- int ret;
+ u64 last = 0;
+ u32 nritems;
u32 refs;
- int level;
u32 blocksize;
+ int ret;
+ int i;
+ int level;
+ int skipped = 0;
nritems = btrfs_header_nritems(node);
level = btrfs_header_level(node);
- for (i = 0; i < nritems; i++) {
+ if (level)
+ return;
+
+ for (i = slot; i < nritems && skipped < 32; i++) {
bytenr = btrfs_node_blockptr(node, i);
- blocksize = btrfs_level_size(root, level - 1);
- ret = lookup_extent_ref(NULL, root, bytenr, blocksize, &refs);
- BUG_ON(ret);
- if (refs != 1)
+ if (last && ((bytenr > last && bytenr - last > 32 * 1024) ||
+ (last > bytenr && last - bytenr > 32 * 1024))) {
+ skipped++;
continue;
- mutex_unlock(&root->fs_info->fs_mutex);
- ret = readahead_tree_block(root, bytenr, blocksize);
+ }
+ blocksize = btrfs_level_size(root, level - 1);
+ if (i != slot) {
+ ret = lookup_extent_ref(NULL, root, bytenr,
+ blocksize, &refs);
+ BUG_ON(ret);
+ if (refs != 1) {
+ skipped++;
+ continue;
+ }
+ }
+ ret = readahead_tree_block(root, bytenr, blocksize,
+ btrfs_node_ptr_generation(node, i));
+ last = bytenr + blocksize;
cond_resched();
- mutex_lock(&root->fs_info->fs_mutex);
if (ret)
break;
}
}
+/*
+ * we want to avoid as much random IO as we can with the alloc mutex
+ * held, so drop the lock and do the lookup, then do it again with the
+ * lock held.
+ */
+int drop_snap_lookup_refcount(struct btrfs_root *root, u64 start, u64 len,
+ u32 *refs)
+{
+ mutex_unlock(&root->fs_info->alloc_mutex);
+ lookup_extent_ref(NULL, root, start, len, refs);
+ cond_resched();
+ mutex_lock(&root->fs_info->alloc_mutex);
+ return lookup_extent_ref(NULL, root, start, len, refs);
+}
+
/*
* helper function for drop_snapshot, this walks down the tree dropping ref
* counts as it goes.
*/
-static int walk_down_tree(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, struct btrfs_path *path, int *level)
+static int noinline walk_down_tree(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, int *level)
{
+ u64 root_owner;
+ u64 root_gen;
+ u64 bytenr;
+ u64 ptr_gen;
struct extent_buffer *next;
struct extent_buffer *cur;
- u64 bytenr;
+ struct extent_buffer *parent;
u32 blocksize;
int ret;
u32 refs;
+ mutex_lock(&root->fs_info->alloc_mutex);
+
WARN_ON(*level < 0);
WARN_ON(*level >= BTRFS_MAX_LEVEL);
- ret = lookup_extent_ref(trans, root,
- path->nodes[*level]->start,
+ ret = drop_snap_lookup_refcount(root, path->nodes[*level]->start,
path->nodes[*level]->len, &refs);
BUG_ON(ret);
if (refs > 1)
WARN_ON(*level >= BTRFS_MAX_LEVEL);
cur = path->nodes[*level];
- if (*level > 0 && path->slots[*level] == 0)
- reada_walk_down(root, cur);
-
if (btrfs_header_level(cur) != *level)
WARN_ON(1);
break;
}
bytenr = btrfs_node_blockptr(cur, path->slots[*level]);
+ ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]);
blocksize = btrfs_level_size(root, *level - 1);
- ret = lookup_extent_ref(trans, root, bytenr, blocksize, &refs);
+
+ ret = drop_snap_lookup_refcount(root, bytenr, blocksize, &refs);
BUG_ON(ret);
if (refs != 1) {
+ parent = path->nodes[*level];
+ root_owner = btrfs_header_owner(parent);
+ root_gen = btrfs_header_generation(parent);
path->slots[*level]++;
- ret = btrfs_free_extent(trans, root, bytenr,
- blocksize, 1);
+ ret = __btrfs_free_extent(trans, root, bytenr,
+ blocksize, root_owner,
+ root_gen, 0, 0, 1);
BUG_ON(ret);
continue;
}
next = btrfs_find_tree_block(root, bytenr, blocksize);
- if (!next || !btrfs_buffer_uptodate(next)) {
+ if (!next || !btrfs_buffer_uptodate(next, ptr_gen)) {
free_extent_buffer(next);
- mutex_unlock(&root->fs_info->fs_mutex);
- next = read_tree_block(root, bytenr, blocksize);
- mutex_lock(&root->fs_info->fs_mutex);
+ mutex_unlock(&root->fs_info->alloc_mutex);
- /* we dropped the lock, check one more time */
- ret = lookup_extent_ref(trans, root, bytenr,
- blocksize, &refs);
+ if (path->slots[*level] == 0)
+ reada_walk_down(root, cur, path->slots[*level]);
+
+ next = read_tree_block(root, bytenr, blocksize,
+ ptr_gen);
+ cond_resched();
+ mutex_lock(&root->fs_info->alloc_mutex);
+
+ /* we've dropped the lock, double check */
+ ret = lookup_extent_ref(NULL, root, bytenr, blocksize,
+ &refs);
BUG_ON(ret);
if (refs != 1) {
+ parent = path->nodes[*level];
+ root_owner = btrfs_header_owner(parent);
+ root_gen = btrfs_header_generation(parent);
+
path->slots[*level]++;
free_extent_buffer(next);
- ret = btrfs_free_extent(trans, root,
- bytenr, blocksize, 1);
+ ret = __btrfs_free_extent(trans, root, bytenr,
+ blocksize,
+ root_owner,
+ root_gen, 0, 0, 1);
BUG_ON(ret);
continue;
}
out:
WARN_ON(*level < 0);
WARN_ON(*level >= BTRFS_MAX_LEVEL);
- ret = btrfs_free_extent(trans, root, path->nodes[*level]->start,
- path->nodes[*level]->len, 1);
+
+ if (path->nodes[*level] == root->node) {
+ root_owner = root->root_key.objectid;
+ parent = path->nodes[*level];
+ } else {
+ parent = path->nodes[*level + 1];
+ root_owner = btrfs_header_owner(parent);
+ }
+
+ root_gen = btrfs_header_generation(parent);
+ ret = __btrfs_free_extent(trans, root, path->nodes[*level]->start,
+ path->nodes[*level]->len,
+ root_owner, root_gen, 0, 0, 1);
free_extent_buffer(path->nodes[*level]);
path->nodes[*level] = NULL;
*level += 1;
BUG_ON(ret);
+ mutex_unlock(&root->fs_info->alloc_mutex);
+ cond_resched();
return 0;
}
* to find the first node higher up where we haven't yet gone through
* all the slots
*/
-static int walk_up_tree(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, struct btrfs_path *path, int *level)
+static int noinline walk_up_tree(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, int *level)
{
+ u64 root_owner;
+ u64 root_gen;
+ struct btrfs_root_item *root_item = &root->root_item;
int i;
int slot;
int ret;
- struct btrfs_root_item *root_item = &root->root_item;
for(i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) {
slot = path->slots[i];
root_item->drop_level = i;
return 0;
} else {
+ if (path->nodes[*level] == root->node) {
+ root_owner = root->root_key.objectid;
+ root_gen =
+ btrfs_header_generation(path->nodes[*level]);
+ } else {
+ struct extent_buffer *node;
+ node = path->nodes[*level + 1];
+ root_owner = btrfs_header_owner(node);
+ root_gen = btrfs_header_generation(node);
+ }
ret = btrfs_free_extent(trans, root,
path->nodes[*level]->start,
- path->nodes[*level]->len, 1);
+ path->nodes[*level]->len,
+ root_owner, root_gen, 0, 0, 1);
BUG_ON(ret);
free_extent_buffer(path->nodes[*level]);
path->nodes[*level] = NULL;
int orig_level;
struct btrfs_root_item *root_item = &root->root_item;
+ WARN_ON(!mutex_is_locked(&root->fs_info->drop_mutex));
path = btrfs_alloc_path();
BUG_ON(!path);
btrfs_node_key(node, &found_key, path->slots[level]);
WARN_ON(memcmp(&found_key, &root_item->drop_progress,
sizeof(found_key)));
+ /*
+ * unlock our path, this is safe because only this
+ * function is allowed to delete this snapshot
+ */
+ for (i = 0; i < BTRFS_MAX_LEVEL; i++) {
+ if (path->nodes[i] && path->locks[i]) {
+ path->locks[i] = 0;
+ btrfs_tree_unlock(path->nodes[i]);
+ }
+ }
}
while(1) {
wret = walk_down_tree(trans, root, path, &level);
break;
if (wret < 0)
ret = wret;
- ret = -EAGAIN;
- break;
+ if (trans->transaction->in_commit) {
+ ret = -EAGAIN;
+ break;
+ }
}
for (i = 0; i <= orig_level; i++) {
if (path->nodes[i]) {
u64 end;
u64 ptr;
int ret;
+
+ mutex_lock(&info->alloc_mutex);
while(1) {
ret = find_first_extent_bit(&info->block_group_cache, 0,
&start, &end, (unsigned int)-1);
clear_extent_dirty(&info->free_space_cache, start,
end, GFP_NOFS);
}
+ mutex_unlock(&info->alloc_mutex);
+ return 0;
+}
+
+static unsigned long calc_ra(unsigned long start, unsigned long last,
+ unsigned long nr)
+{
+ return min(last, start + nr - 1);
+}
+
+static int noinline relocate_inode_pages(struct inode *inode, u64 start,
+ u64 len)
+{
+ u64 page_start;
+ u64 page_end;
+ unsigned long last_index;
+ unsigned long i;
+ struct page *page;
+ struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
+ struct file_ra_state *ra;
+ unsigned long total_read = 0;
+ unsigned long ra_pages;
+ struct btrfs_trans_handle *trans;
+
+ ra = kzalloc(sizeof(*ra), GFP_NOFS);
+
+ mutex_lock(&inode->i_mutex);
+ i = start >> PAGE_CACHE_SHIFT;
+ last_index = (start + len - 1) >> PAGE_CACHE_SHIFT;
+
+ ra_pages = BTRFS_I(inode)->root->fs_info->bdi.ra_pages;
+
+ file_ra_state_init(ra, inode->i_mapping);
+
+ for (; i <= last_index; i++) {
+ if (total_read % ra_pages == 0) {
+ btrfs_force_ra(inode->i_mapping, ra, NULL, i,
+ calc_ra(i, last_index, ra_pages));
+ }
+ total_read++;
+ if (((u64)i << PAGE_CACHE_SHIFT) > inode->i_size)
+ goto truncate_racing;
+
+ page = grab_cache_page(inode->i_mapping, i);
+ if (!page) {
+ goto out_unlock;
+ }
+ if (!PageUptodate(page)) {
+ btrfs_readpage(NULL, page);
+ lock_page(page);
+ if (!PageUptodate(page)) {
+ unlock_page(page);
+ page_cache_release(page);
+ goto out_unlock;
+ }
+ }
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
+ ClearPageDirty(page);
+#else
+ cancel_dirty_page(page, PAGE_CACHE_SIZE);
+#endif
+ wait_on_page_writeback(page);
+ set_page_extent_mapped(page);
+ page_start = (u64)page->index << PAGE_CACHE_SHIFT;
+ page_end = page_start + PAGE_CACHE_SIZE - 1;
+
+ lock_extent(io_tree, page_start, page_end, GFP_NOFS);
+
+ set_extent_delalloc(io_tree, page_start,
+ page_end, GFP_NOFS);
+ set_page_dirty(page);
+
+ unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
+ unlock_page(page);
+ page_cache_release(page);
+ }
+ balance_dirty_pages_ratelimited_nr(inode->i_mapping,
+ total_read);
+
+out_unlock:
+ kfree(ra);
+ trans = btrfs_start_transaction(BTRFS_I(inode)->root, 1);
+ if (trans) {
+ btrfs_end_transaction(trans, BTRFS_I(inode)->root);
+ mark_inode_dirty(inode);
+ }
+ mutex_unlock(&inode->i_mutex);
+ return 0;
+
+truncate_racing:
+ vmtruncate(inode, inode->i_size);
+ balance_dirty_pages_ratelimited_nr(inode->i_mapping,
+ total_read);
+ goto out_unlock;
+}
+
+/*
+ * The back references tell us which tree holds a ref on a block,
+ * but it is possible for the tree root field in the reference to
+ * reflect the original root before a snapshot was made. In this
+ * case we should search through all the children of a given root
+ * to find potential holders of references on a block.
+ *
+ * Instead, we do something a little less fancy and just search
+ * all the roots for a given key/block combination.
+ */
+static int find_root_for_ref(struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct btrfs_key *key0,
+ int level,
+ int file_key,
+ struct btrfs_root **found_root,
+ u64 bytenr)
+{
+ struct btrfs_key root_location;
+ struct btrfs_root *cur_root = *found_root;
+ struct btrfs_file_extent_item *file_extent;
+ u64 root_search_start = BTRFS_FS_TREE_OBJECTID;
+ u64 found_bytenr;
+ int ret;
+
+ root_location.offset = (u64)-1;
+ root_location.type = BTRFS_ROOT_ITEM_KEY;
+ path->lowest_level = level;
+ path->reada = 0;
+ while(1) {
+ ret = btrfs_search_slot(NULL, cur_root, key0, path, 0, 0);
+ found_bytenr = 0;
+ if (ret == 0 && file_key) {
+ struct extent_buffer *leaf = path->nodes[0];
+ file_extent = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_file_extent_item);
+ if (btrfs_file_extent_type(leaf, file_extent) ==
+ BTRFS_FILE_EXTENT_REG) {
+ found_bytenr =
+ btrfs_file_extent_disk_bytenr(leaf,
+ file_extent);
+ }
+ } else if (!file_key) {
+ if (path->nodes[level])
+ found_bytenr = path->nodes[level]->start;
+ }
+
+ btrfs_release_path(cur_root, path);
+
+ if (found_bytenr == bytenr) {
+ *found_root = cur_root;
+ ret = 0;
+ goto out;
+ }
+ ret = btrfs_search_root(root->fs_info->tree_root,
+ root_search_start, &root_search_start);
+ if (ret)
+ break;
+
+ root_location.objectid = root_search_start;
+ cur_root = btrfs_read_fs_root_no_name(root->fs_info,
+ &root_location);
+ if (!cur_root) {
+ ret = 1;
+ break;
+ }
+ }
+out:
+ path->lowest_level = 0;
+ return ret;
+}
+
+/*
+ * note, this releases the path
+ */
+static int noinline relocate_one_reference(struct btrfs_root *extent_root,
+ struct btrfs_path *path,
+ struct btrfs_key *extent_key,
+ u64 *last_file_objectid,
+ u64 *last_file_offset,
+ u64 *last_file_root,
+ u64 last_extent)
+{
+ struct inode *inode;
+ struct btrfs_root *found_root;
+ struct btrfs_key root_location;
+ struct btrfs_key found_key;
+ struct btrfs_extent_ref *ref;
+ u64 ref_root;
+ u64 ref_gen;
+ u64 ref_objectid;
+ u64 ref_offset;
+ int ret;
+ int level;
+
+ WARN_ON(!mutex_is_locked(&extent_root->fs_info->alloc_mutex));
+
+ ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
+ struct btrfs_extent_ref);
+ ref_root = btrfs_ref_root(path->nodes[0], ref);
+ ref_gen = btrfs_ref_generation(path->nodes[0], ref);
+ ref_objectid = btrfs_ref_objectid(path->nodes[0], ref);
+ ref_offset = btrfs_ref_offset(path->nodes[0], ref);
+ btrfs_release_path(extent_root, path);
+
+ root_location.objectid = ref_root;
+ if (ref_gen == 0)
+ root_location.offset = 0;
+ else
+ root_location.offset = (u64)-1;
+ root_location.type = BTRFS_ROOT_ITEM_KEY;
+
+ found_root = btrfs_read_fs_root_no_name(extent_root->fs_info,
+ &root_location);
+ BUG_ON(!found_root);
+ mutex_unlock(&extent_root->fs_info->alloc_mutex);
+
+ if (ref_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
+ found_key.objectid = ref_objectid;
+ found_key.type = BTRFS_EXTENT_DATA_KEY;
+ found_key.offset = ref_offset;
+ level = 0;
+
+ if (last_extent == extent_key->objectid &&
+ *last_file_objectid == ref_objectid &&
+ *last_file_offset == ref_offset &&
+ *last_file_root == ref_root)
+ goto out;
+
+ ret = find_root_for_ref(extent_root, path, &found_key,
+ level, 1, &found_root,
+ extent_key->objectid);
+
+ if (ret)
+ goto out;
+
+ if (last_extent == extent_key->objectid &&
+ *last_file_objectid == ref_objectid &&
+ *last_file_offset == ref_offset &&
+ *last_file_root == ref_root)
+ goto out;
+
+ inode = btrfs_iget_locked(extent_root->fs_info->sb,
+ ref_objectid, found_root);
+ if (inode->i_state & I_NEW) {
+ /* the inode and parent dir are two different roots */
+ BTRFS_I(inode)->root = found_root;
+ BTRFS_I(inode)->location.objectid = ref_objectid;
+ BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY;
+ BTRFS_I(inode)->location.offset = 0;
+ btrfs_read_locked_inode(inode);
+ unlock_new_inode(inode);
+
+ }
+ /* this can happen if the reference is not against
+ * the latest version of the tree root
+ */
+ if (is_bad_inode(inode))
+ goto out;
+
+ *last_file_objectid = inode->i_ino;
+ *last_file_root = found_root->root_key.objectid;
+ *last_file_offset = ref_offset;
+
+ relocate_inode_pages(inode, ref_offset, extent_key->offset);
+ iput(inode);
+ } else {
+ struct btrfs_trans_handle *trans;
+ struct extent_buffer *eb;
+ int needs_lock = 0;
+
+ eb = read_tree_block(found_root, extent_key->objectid,
+ extent_key->offset, 0);
+ btrfs_tree_lock(eb);
+ level = btrfs_header_level(eb);
+
+ if (level == 0)
+ btrfs_item_key_to_cpu(eb, &found_key, 0);
+ else
+ btrfs_node_key_to_cpu(eb, &found_key, 0);
+
+ btrfs_tree_unlock(eb);
+ free_extent_buffer(eb);
+
+ ret = find_root_for_ref(extent_root, path, &found_key,
+ level, 0, &found_root,
+ extent_key->objectid);
+
+ if (ret)
+ goto out;
+
+ /*
+ * right here almost anything could happen to our key,
+ * but that's ok. The cow below will either relocate it
+ * or someone else will have relocated it. Either way,
+ * it is in a different spot than it was before and
+ * we're happy.
+ */
+
+ trans = btrfs_start_transaction(found_root, 1);
+
+ if (found_root == extent_root->fs_info->extent_root ||
+ found_root == extent_root->fs_info->chunk_root ||
+ found_root == extent_root->fs_info->dev_root) {
+ needs_lock = 1;
+ mutex_lock(&extent_root->fs_info->alloc_mutex);
+ }
+
+ path->lowest_level = level;
+ path->reada = 2;
+ ret = btrfs_search_slot(trans, found_root, &found_key, path,
+ 0, 1);
+ path->lowest_level = 0;
+ btrfs_release_path(found_root, path);
+
+ if (found_root == found_root->fs_info->extent_root)
+ btrfs_extent_post_op(trans, found_root);
+ if (needs_lock)
+ mutex_unlock(&extent_root->fs_info->alloc_mutex);
+
+ btrfs_end_transaction(trans, found_root);
+
+ }
+out:
+ mutex_lock(&extent_root->fs_info->alloc_mutex);
+ return 0;
+}
+
+static int noinline del_extent_zero(struct btrfs_root *extent_root,
+ struct btrfs_path *path,
+ struct btrfs_key *extent_key)
+{
+ int ret;
+ struct btrfs_trans_handle *trans;
+
+ trans = btrfs_start_transaction(extent_root, 1);
+ ret = btrfs_search_slot(trans, extent_root, extent_key, path, -1, 1);
+ if (ret > 0) {
+ ret = -EIO;
+ goto out;
+ }
+ if (ret < 0)
+ goto out;
+ ret = btrfs_del_item(trans, extent_root, path);
+out:
+ btrfs_end_transaction(trans, extent_root);
+ return ret;
+}
+
+static int noinline relocate_one_extent(struct btrfs_root *extent_root,
+ struct btrfs_path *path,
+ struct btrfs_key *extent_key)
+{
+ struct btrfs_key key;
+ struct btrfs_key found_key;
+ struct extent_buffer *leaf;
+ u64 last_file_objectid = 0;
+ u64 last_file_root = 0;
+ u64 last_file_offset = (u64)-1;
+ u64 last_extent = 0;
+ u32 nritems;
+ u32 item_size;
+ int ret = 0;
+
+ if (extent_key->objectid == 0) {
+ ret = del_extent_zero(extent_root, path, extent_key);
+ goto out;
+ }
+ key.objectid = extent_key->objectid;
+ key.type = BTRFS_EXTENT_REF_KEY;
+ key.offset = 0;
+
+ while(1) {
+ ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
+
+ if (ret < 0)
+ goto out;
+
+ ret = 0;
+ leaf = path->nodes[0];
+ nritems = btrfs_header_nritems(leaf);
+ if (path->slots[0] == nritems) {
+ ret = btrfs_next_leaf(extent_root, path);
+ if (ret > 0) {
+ ret = 0;
+ goto out;
+ }
+ if (ret < 0)
+ goto out;
+ leaf = path->nodes[0];
+ }
+
+ btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
+ if (found_key.objectid != extent_key->objectid) {
+ break;
+ }
+
+ if (found_key.type != BTRFS_EXTENT_REF_KEY) {
+ break;
+ }
+
+ key.offset = found_key.offset + 1;
+ item_size = btrfs_item_size_nr(leaf, path->slots[0]);
+
+ ret = relocate_one_reference(extent_root, path, extent_key,
+ &last_file_objectid,
+ &last_file_offset,
+ &last_file_root, last_extent);
+ if (ret)
+ goto out;
+ last_extent = extent_key->objectid;
+ }
+ ret = 0;
+out:
+ btrfs_release_path(extent_root, path);
+ return ret;
+}
+
+static u64 update_block_group_flags(struct btrfs_root *root, u64 flags)
+{
+ u64 num_devices;
+ u64 stripped = BTRFS_BLOCK_GROUP_RAID0 |
+ BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10;
+
+ num_devices = root->fs_info->fs_devices->num_devices;
+ if (num_devices == 1) {
+ stripped |= BTRFS_BLOCK_GROUP_DUP;
+ stripped = flags & ~stripped;
+
+ /* turn raid0 into single device chunks */
+ if (flags & BTRFS_BLOCK_GROUP_RAID0)
+ return stripped;
+
+ /* turn mirroring into duplication */
+ if (flags & (BTRFS_BLOCK_GROUP_RAID1 |
+ BTRFS_BLOCK_GROUP_RAID10))
+ return stripped | BTRFS_BLOCK_GROUP_DUP;
+ return flags;
+ } else {
+ /* they already had raid on here, just return */
+ if (flags & stripped)
+ return flags;
+
+ stripped |= BTRFS_BLOCK_GROUP_DUP;
+ stripped = flags & ~stripped;
+
+ /* switch duplicated blocks with raid1 */
+ if (flags & BTRFS_BLOCK_GROUP_DUP)
+ return stripped | BTRFS_BLOCK_GROUP_RAID1;
+
+ /* turn single device chunks into raid0 */
+ return stripped | BTRFS_BLOCK_GROUP_RAID0;
+ }
+ return flags;
+}
+
+int __alloc_chunk_for_shrink(struct btrfs_root *root,
+ struct btrfs_block_group_cache *shrink_block_group,
+ int force)
+{
+ struct btrfs_trans_handle *trans;
+ u64 new_alloc_flags;
+ u64 calc;
+
+ spin_lock(&shrink_block_group->lock);
+ if (btrfs_block_group_used(&shrink_block_group->item) > 0) {
+ spin_unlock(&shrink_block_group->lock);
+ mutex_unlock(&root->fs_info->alloc_mutex);
+
+ trans = btrfs_start_transaction(root, 1);
+ mutex_lock(&root->fs_info->alloc_mutex);
+ spin_lock(&shrink_block_group->lock);
+
+ new_alloc_flags = update_block_group_flags(root,
+ shrink_block_group->flags);
+ if (new_alloc_flags != shrink_block_group->flags) {
+ calc =
+ btrfs_block_group_used(&shrink_block_group->item);
+ } else {
+ calc = shrink_block_group->key.offset;
+ }
+ spin_unlock(&shrink_block_group->lock);
+
+ do_chunk_alloc(trans, root->fs_info->extent_root,
+ calc + 2 * 1024 * 1024, new_alloc_flags, force);
+
+ mutex_unlock(&root->fs_info->alloc_mutex);
+ btrfs_end_transaction(trans, root);
+ mutex_lock(&root->fs_info->alloc_mutex);
+ } else
+ spin_unlock(&shrink_block_group->lock);
return 0;
}
+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 btrfs_key key;
+ struct btrfs_key found_key;
+ struct extent_buffer *leaf;
+ u32 nritems;
+ int ret;
+ int progress;
+
+ mutex_lock(&root->fs_info->alloc_mutex);
+ shrink_block_group = btrfs_lookup_block_group(root->fs_info,
+ shrink_start);
+ BUG_ON(!shrink_block_group);
+
+ shrink_last_byte = shrink_block_group->key.objectid +
+ shrink_block_group->key.offset;
+
+ shrink_block_group->space_info->total_bytes -=
+ shrink_block_group->key.offset;
+ path = btrfs_alloc_path();
+ root = root->fs_info->extent_root;
+ path->reada = 2;
+
+ printk("btrfs relocating block group %llu flags %llu\n",
+ (unsigned long long)shrink_start,
+ (unsigned long long)shrink_block_group->flags);
+
+ __alloc_chunk_for_shrink(root, shrink_block_group, 1);
+
+again:
+
+ shrink_block_group->ro = 1;
+
+ total_found = 0;
+ progress = 0;
+ key.objectid = shrink_start;
+ key.offset = 0;
+ key.type = 0;
+ cur_byte = key.objectid;
+
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ if (ret < 0)
+ goto out;
+
+ 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 > shrink_start &&
+ found_key.objectid < shrink_last_byte) {
+ cur_byte = found_key.objectid;
+ key.objectid = cur_byte;
+ }
+ }
+ btrfs_release_path(root, path);
+
+ while(1) {
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ if (ret < 0)
+ goto out;
+
+next:
+ leaf = path->nodes[0];
+ nritems = btrfs_header_nritems(leaf);
+ if (path->slots[0] >= nritems) {
+ ret = btrfs_next_leaf(root, path);
+ if (ret < 0)
+ goto out;
+ if (ret == 1) {
+ ret = 0;
+ break;
+ }
+ leaf = path->nodes[0];
+ nritems = btrfs_header_nritems(leaf);
+ }
+
+ 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));
+ cond_resched();
+ btrfs_release_path(root, path);
+ btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ progress = 0;
+ goto next;
+ }
+ progress = 1;
+
+ if (btrfs_key_type(&found_key) != BTRFS_EXTENT_ITEM_KEY ||
+ found_key.objectid + found_key.offset <= cur_byte) {
+ memcpy(&key, &found_key, sizeof(key));
+ key.offset++;
+ path->slots[0]++;
+ goto next;
+ }
+
+ total_found++;
+ cur_byte = found_key.objectid + found_key.offset;
+ key.objectid = cur_byte;
+ btrfs_release_path(root, path);
+ ret = relocate_one_extent(root, path, &found_key);
+ __alloc_chunk_for_shrink(root, shrink_block_group, 0);
+ }
+
+ btrfs_release_path(root, path);
+
+ if (total_found > 0) {
+ printk("btrfs relocate found %llu last extent was %llu\n",
+ (unsigned long long)total_found,
+ (unsigned long long)found_key.objectid);
+ mutex_unlock(&root->fs_info->alloc_mutex);
+ trans = btrfs_start_transaction(tree_root, 1);
+ btrfs_commit_transaction(trans, tree_root);
+
+ btrfs_clean_old_snapshots(tree_root);
+
+ trans = btrfs_start_transaction(tree_root, 1);
+ btrfs_commit_transaction(trans, tree_root);
+ mutex_lock(&root->fs_info->alloc_mutex);
+ goto again;
+ }
+
+ /*
+ * we've freed all the extents, now remove the block
+ * group item from the tree
+ */
+ mutex_unlock(&root->fs_info->alloc_mutex);
+
+ trans = btrfs_start_transaction(root, 1);
+
+ mutex_lock(&root->fs_info->alloc_mutex);
+ memcpy(&key, &shrink_block_group->key, sizeof(key));
+
+ ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
+ if (ret > 0)
+ ret = -EIO;
+ if (ret < 0)
+ goto out;
+
+ clear_extent_bits(&info->block_group_cache, key.objectid,
+ key.objectid + key.offset - 1,
+ (unsigned int)-1, GFP_NOFS);
+
+
+ clear_extent_bits(&info->free_space_cache,
+ key.objectid, key.objectid + key.offset - 1,
+ (unsigned int)-1, GFP_NOFS);
+
+ memset(shrink_block_group, 0, sizeof(*shrink_block_group));
+ kfree(shrink_block_group);
+
+ btrfs_del_item(trans, root, path);
+ btrfs_release_path(root, path);
+ mutex_unlock(&root->fs_info->alloc_mutex);
+ btrfs_commit_transaction(trans, root);
+
+ mutex_lock(&root->fs_info->alloc_mutex);
+
+ /* the code to unpin extents might set a few bits in the free
+ * space cache for this range again
+ */
+ clear_extent_bits(&info->free_space_cache,
+ key.objectid, key.objectid + key.offset - 1,
+ (unsigned int)-1, GFP_NOFS);
+out:
+ btrfs_free_path(path);
+ mutex_unlock(&root->fs_info->alloc_mutex);
+ return ret;
+}
+
+int find_first_block_group(struct btrfs_root *root, struct btrfs_path *path,
+ struct btrfs_key *key)
+{
+ int ret = 0;
+ struct btrfs_key found_key;
+ struct extent_buffer *leaf;
+ int slot;
+
+ ret = btrfs_search_slot(NULL, root, key, path, 0, 0);
+ if (ret < 0)
+ goto out;
+
+ while(1) {
+ slot = path->slots[0];
+ leaf = path->nodes[0];
+ if (slot >= btrfs_header_nritems(leaf)) {
+ ret = btrfs_next_leaf(root, path);
+ if (ret == 0)
+ continue;
+ if (ret < 0)
+ goto out;
+ break;
+ }
+ btrfs_item_key_to_cpu(leaf, &found_key, slot);
+
+ if (found_key.objectid >= key->objectid &&
+ found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) {
+ ret = 0;
+ goto out;
+ }
+ path->slots[0]++;
+ }
+ ret = -ENOENT;
+out:
+ return ret;
+}
+
int btrfs_read_block_groups(struct btrfs_root *root)
{
struct btrfs_path *path;
int ret;
- int err = 0;
int bit;
struct btrfs_block_group_cache *cache;
struct btrfs_fs_info *info = root->fs_info;
- struct extent_map_tree *block_group_cache;
+ struct btrfs_space_info *space_info;
+ struct extent_io_tree *block_group_cache;
struct btrfs_key key;
struct btrfs_key found_key;
struct extent_buffer *leaf;
block_group_cache = &info->block_group_cache;
-
root = info->extent_root;
key.objectid = 0;
- key.offset = BTRFS_BLOCK_GROUP_SIZE;
+ key.offset = 0;
btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY);
-
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
+ mutex_lock(&root->fs_info->alloc_mutex);
while(1) {
- ret = btrfs_search_slot(NULL, info->extent_root,
- &key, path, 0, 0);
- if (ret != 0) {
- err = ret;
- break;
+ ret = find_first_block_group(root, path, &key);
+ if (ret > 0) {
+ ret = 0;
+ goto error;
}
+ if (ret != 0)
+ goto error;
+
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) {
- err = -1;
+ ret = -ENOMEM;
break;
}
+ spin_lock_init(&cache->lock);
read_extent_buffer(leaf, &cache->item,
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);
-
- if (cache->item.flags & BTRFS_BLOCK_GROUP_MIXED) {
- bit = BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA;
- cache->data = BTRFS_BLOCK_GROUP_MIXED;
- } else if (cache->item.flags & BTRFS_BLOCK_GROUP_DATA) {
+ cache->flags = btrfs_block_group_flags(&cache->item);
+ bit = 0;
+ if (cache->flags & BTRFS_BLOCK_GROUP_DATA) {
bit = BLOCK_GROUP_DATA;
- cache->data = BTRFS_BLOCK_GROUP_DATA;
- } else {
+ } else if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) {
+ bit = BLOCK_GROUP_SYSTEM;
+ } else if (cache->flags & BTRFS_BLOCK_GROUP_METADATA) {
bit = BLOCK_GROUP_METADATA;
- cache->data = 0;
}
+ set_avail_alloc_bits(info, cache->flags);
+
+ ret = update_space_info(info, cache->flags, found_key.offset,
+ btrfs_block_group_used(&cache->item),
+ &space_info);
+ BUG_ON(ret);
+ cache->space_info = space_info;
/* use EXTENT_LOCKED to prevent merging */
set_extent_bits(block_group_cache, found_key.objectid,
found_key.objectid + found_key.offset - 1,
- bit | EXTENT_LOCKED, GFP_NOFS);
+ EXTENT_LOCKED, GFP_NOFS);
set_state_private(block_group_cache, found_key.objectid,
(unsigned long)cache);
-
+ set_extent_bits(block_group_cache, found_key.objectid,
+ found_key.objectid + found_key.offset - 1,
+ bit | EXTENT_LOCKED, GFP_NOFS);
if (key.objectid >=
btrfs_super_total_bytes(&info->super_copy))
break;
}
-
+ ret = 0;
+error:
btrfs_free_path(path);
+ mutex_unlock(&root->fs_info->alloc_mutex);
+ return ret;
+}
+
+int btrfs_make_block_group(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 bytes_used,
+ u64 type, u64 chunk_objectid, u64 chunk_offset,
+ u64 size)
+{
+ int ret;
+ int bit = 0;
+ struct btrfs_root *extent_root;
+ struct btrfs_block_group_cache *cache;
+ struct extent_io_tree *block_group_cache;
+
+ WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex));
+ extent_root = root->fs_info->extent_root;
+ block_group_cache = &root->fs_info->block_group_cache;
+
+ cache = kzalloc(sizeof(*cache), GFP_NOFS);
+ BUG_ON(!cache);
+ cache->key.objectid = chunk_offset;
+ cache->key.offset = size;
+ spin_lock_init(&cache->lock);
+ btrfs_set_key_type(&cache->key, BTRFS_BLOCK_GROUP_ITEM_KEY);
+
+ btrfs_set_block_group_used(&cache->item, bytes_used);
+ btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid);
+ cache->flags = type;
+ btrfs_set_block_group_flags(&cache->item, type);
+
+ ret = update_space_info(root->fs_info, cache->flags, size, bytes_used,
+ &cache->space_info);
+ BUG_ON(ret);
+
+ bit = block_group_state_bits(type);
+ set_extent_bits(block_group_cache, chunk_offset,
+ chunk_offset + size - 1,
+ EXTENT_LOCKED, GFP_NOFS);
+ set_state_private(block_group_cache, chunk_offset,
+ (unsigned long)cache);
+ set_extent_bits(block_group_cache, chunk_offset,
+ chunk_offset + size - 1,
+ bit | EXTENT_LOCKED, GFP_NOFS);
+
+ ret = btrfs_insert_item(trans, extent_root, &cache->key, &cache->item,
+ sizeof(cache->item));
+ BUG_ON(ret);
+
+ finish_current_insert(trans, extent_root);
+ ret = del_pending_extents(trans, extent_root);
+ BUG_ON(ret);
+ set_avail_alloc_bits(extent_root->fs_info, type);
+
return 0;
}
git.openpandora.org / pandora-kernel.git / blobdiff