#include "print-tree.h"
#include "transaction.h"
#include "volumes.h"
+#include "locking.h"
#define BLOCK_GROUP_DATA EXTENT_WRITEBACK
#define BLOCK_GROUP_METADATA EXTENT_UPTODATE
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)
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;
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;
return bits;
}
-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 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_io_tree *block_group_cache;
struct btrfs_block_group_cache *shint;
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->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;
} else {
if (hint)
}
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);
free_check = div_factor(cache->key.offset, factor);
if (used + cache->pinned < free_check) {
found_group = cache;
+ spin_unlock(&cache->lock);
goto found;
}
}
+ spin_unlock(&cache->lock);
cond_resched();
}
if (!wrapped) {
return found_group;
}
+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)
{
return ret;
}
-int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
+static 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,
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)
{
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)
out:
btrfs_free_path(path);
+ mutex_unlock(&root->fs_info->alloc_mutex);
return total_count;
}
-int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, u64 owner_objectid)
-{
- u64 generation;
- u64 key_objectid;
- u64 level;
- u32 nritems;
- struct btrfs_disk_key disk_key;
-
- level = btrfs_header_level(root->node);
- generation = trans->transid;
- nritems = btrfs_header_nritems(root->node);
- if (nritems > 0) {
- if (level == 0)
- btrfs_item_key(root->node, &disk_key, 0);
- else
- btrfs_node_key(root->node, &disk_key, 0);
- key_objectid = btrfs_disk_key_objectid(&disk_key);
- } else {
- key_objectid = 0;
- }
- return btrfs_inc_extent_ref(trans, root, root->node->start,
- root->node->len, owner_objectid,
- generation, level, key_objectid);
-}
int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct extent_buffer *buf)
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,
+
+ 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);
btrfs_node_key_to_cpu(buf, &key, i);
- ret = btrfs_inc_extent_ref(trans, root, bytenr,
+
+ 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;
}
}
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);
BLOCK_GROUP_DIRTY, GFP_NOFS);
}
btrfs_free_path(path);
+ mutex_unlock(&root->fs_info->alloc_mutex);
return werr;
}
space_info->force_alloc = 0;
}
if (space_info->full)
- return 0;
+ goto out;
thresh = div_factor(space_info->total_bytes, 6);
if (!force &&
(space_info->bytes_used + space_info->bytes_pinned + alloc_bytes) <
thresh)
- return 0;
+ 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;
- return 0;
+ 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;
}
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) {
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;
}
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);
}
if (pin) {
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 {
if (cache) {
+ spin_lock(&cache->lock);
cache->pinned -= len;
cache->space_info->bytes_pinned -= len;
+ spin_unlock(&cache->lock);
}
fs_info->total_pinned -= len;
}
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;
}
int level;
int err = 0;
+ 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);
path = btrfs_alloc_path();
&extent_item, sizeof(extent_item));
clear_extent_bits(&info->extent_ins, start, end, EXTENT_LOCKED,
GFP_NOFS);
- eb = read_tree_block(extent_root, ins.objectid, ins.offset,
- trans->transid);
+
+ 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);
- free_extent_buffer(eb);
+ 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, 0)) {
+ if (btrfs_try_tree_lock(buf) &&
+ btrfs_buffer_uptodate(buf, 0)) {
u64 transid =
root->fs_info->running_transaction->transid;
u64 header_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);
}
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;
}
/* 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);
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,
- extent_root->root_key.objectid,
- 0, 0, 0, 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,
- u64 root_objectid, u64 ref_generation,
- u64 owner_objectid, u64 owner_offset, 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;
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);
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)
+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;
- u64 root_used;
u64 search_start = 0;
u64 alloc_profile;
- 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];
if (data) {
alloc_profile = info->avail_data_alloc_bits &
}
if (ret) {
printk("allocation failed flags %Lu\n", data);
+ BUG();
}
- BUG_ON(ret);
- if (ret)
- return ret;
+ clear_extent_dirty(&root->fs_info->free_space_cache,
+ ins->objectid, ins->objectid + ins->offset - 1,
+ GFP_NOFS);
+ return 0;
+}
+
+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;
+}
+
+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];
/* 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);
- clear_extent_dirty(&root->fs_info->free_space_cache,
- ins->objectid, ins->objectid + ins->offset - 1,
- GFP_NOFS);
-
if (root == extent_root) {
set_extent_bits(&root->fs_info->extent_ins, ins->objectid,
ins->objectid + ins->offset - 1,
goto update_block;
}
- WARN_ON(trans->alloc_exclude_nr);
- trans->alloc_exclude_start = ins->objectid;
- trans->alloc_exclude_nr = ins->offset;
-
memcpy(&keys[0], ins, sizeof(*ins));
keys[1].offset = hash_extent_ref(root_objectid, ref_generation,
owner, owner_offset);
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:
ins->objectid, ins->offset);
BUG();
}
- return 0;
+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;
+}
/*
- * helper function to allocate a block for a given tree
- * returns the tree buffer or NULL.
+ * 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.
*/
-struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- u32 blocksize,
- u64 root_objectid, u64 hint,
- u64 empty_size)
+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)
{
- u64 ref_generation;
+ int ret;
- if (root->ref_cows)
- ref_generation = trans->transid;
- else
- ref_generation = 0;
+ 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);
- return __btrfs_alloc_free_block(trans, root, blocksize, root_objectid,
- ref_generation, 0, 0, hint, empty_size);
+ 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 extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u32 blocksize,
u64 root_objectid,
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);
set_extent_dirty(&trans->transaction->dirty_pages, buf->start,
buf->start + buf->len - 1, GFP_NOFS);
- if (!btrfs_test_opt(root, SSD))
- btrfs_set_buffer_defrag(buf);
trans->blocks_used++;
return buf;
}
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,
+
+ 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;
}
continue;
}
}
- mutex_unlock(&root->fs_info->fs_mutex);
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.
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)
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,
+ ret = __btrfs_free_extent(trans, root, bytenr,
blocksize, root_owner,
root_gen, 0, 0, 1);
BUG_ON(ret);
next = btrfs_find_tree_block(root, bytenr, blocksize);
if (!next || !btrfs_buffer_uptodate(next, ptr_gen)) {
free_extent_buffer(next);
- reada_walk_down(root, cur, path->slots[*level]);
+ mutex_unlock(&root->fs_info->alloc_mutex);
+
+ if (path->slots[*level] == 0)
+ reada_walk_down(root, cur, path->slots[*level]);
- mutex_unlock(&root->fs_info->fs_mutex);
next = read_tree_block(root, bytenr, blocksize,
ptr_gen);
- mutex_lock(&root->fs_info->fs_mutex);
+ cond_resched();
+ mutex_lock(&root->fs_info->alloc_mutex);
/* we've dropped the lock, double check */
- ret = lookup_extent_ref(trans, root, bytenr,
- blocksize, &refs);
+ ret = lookup_extent_ref(NULL, root, bytenr, blocksize,
+ &refs);
BUG_ON(ret);
if (refs != 1) {
parent = path->nodes[*level];
path->slots[*level]++;
free_extent_buffer(next);
- ret = btrfs_free_extent(trans, root, bytenr,
+ ret = __btrfs_free_extent(trans, root, bytenr,
blocksize,
root_owner,
root_gen, 0, 0, 1);
}
root_gen = btrfs_header_generation(parent);
- ret = btrfs_free_extent(trans, root, path->nodes[*level]->start,
+ 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;
}
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;
}
kfree(ra);
trans = btrfs_start_transaction(BTRFS_I(inode)->root, 1);
if (trans) {
- btrfs_add_ordered_inode(inode);
btrfs_end_transaction(trans, BTRFS_I(inode)->root);
mark_inode_dirty(inode);
}
u64 root_search_start = BTRFS_FS_TREE_OBJECTID;
u64 found_bytenr;
int ret;
- int i;
root_location.offset = (u64)-1;
root_location.type = BTRFS_ROOT_ITEM_KEY;
found_bytenr = path->nodes[level]->start;
}
- for (i = level; i < BTRFS_MAX_LEVEL; i++) {
- if (!path->nodes[i])
- break;
- free_extent_buffer(path->nodes[i]);
- path->nodes[i] = NULL;
- }
btrfs_release_path(cur_root, path);
if (found_bytenr == bytenr) {
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);
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;
*last_file_root == ref_root)
goto out;
- mutex_unlock(&extent_root->fs_info->fs_mutex);
inode = btrfs_iget_locked(extent_root->fs_info->sb,
ref_objectid, found_root);
if (inode->i_state & I_NEW) {
/* this can happen if the reference is not against
* the latest version of the tree root
*/
- if (is_bad_inode(inode)) {
- mutex_lock(&extent_root->fs_info->fs_mutex);
+ 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);
- mutex_lock(&extent_root->fs_info->fs_mutex);
} else {
struct btrfs_trans_handle *trans;
struct extent_buffer *eb;
- int i;
+ 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)
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,
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;
- for (i = level; i < BTRFS_MAX_LEVEL; i++) {
- if (!path->nodes[i])
- break;
- free_extent_buffer(path->nodes[i]);
- path->nodes[i] = NULL;
- }
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;
}
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) {
} 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 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);
if (ret < 0)
goto out;
+next:
leaf = path->nodes[0];
nritems = btrfs_header_nritems(leaf);
-next:
if (path->slots[0] >= nritems) {
ret = btrfs_next_leaf(root, path);
if (ret < 0)
if (progress && need_resched()) {
memcpy(&key, &found_key, sizeof(key));
- mutex_unlock(&root->fs_info->fs_mutex);
cond_resched();
- mutex_lock(&root->fs_info->fs_mutex);
btrfs_release_path(root, path);
btrfs_search_slot(NULL, root, &key, path, 0, 0);
progress = 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);
- mutex_unlock(&root->fs_info->fs_mutex);
btrfs_clean_old_snapshots(tree_root);
- mutex_lock(&root->fs_info->fs_mutex);
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);
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
*/
(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;
+ 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)
- return ret;
+ goto out;
+
while(1) {
slot = path->slots[0];
leaf = path->nodes[0];
if (ret == 0)
continue;
if (ret < 0)
- goto error;
+ 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)
- return 0;
+ found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) {
+ ret = 0;
+ goto out;
+ }
path->slots[0]++;
}
ret = -ENOENT;
-error:
+out:
return ret;
}
if (!path)
return -ENOMEM;
+ mutex_lock(&root->fs_info->alloc_mutex);
while(1) {
ret = find_first_block_group(root, path, &key);
if (ret > 0) {
break;
}
+ spin_lock_init(&cache->lock);
read_extent_buffer(leaf, &cache->item,
btrfs_item_ptr_offset(leaf, path->slots[0]),
sizeof(cache->item));
/* 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;
}
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;
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);
bit = block_group_state_bits(type);
set_extent_bits(block_group_cache, chunk_offset,
chunk_offset + size - 1,
- bit | EXTENT_LOCKED, GFP_NOFS);
-
+ 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);
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