#include "volumes.h"
#include "locking.h"
#include "ref-cache.h"
+#include "free-space-cache.h"
#define PENDING_EXTENT_INSERT 0
#define PENDING_EXTENT_DELETE 1
u64 extent_start, extent_end, size;
int ret;
- mutex_lock(&info->pinned_mutex);
while (start < end) {
ret = find_first_extent_bit(&info->pinned_extents, start,
&extent_start, &extent_end,
ret = btrfs_add_free_space(block_group, start, size);
BUG_ON(ret);
}
- mutex_unlock(&info->pinned_mutex);
return 0;
}
}
/*
- * return the block group that contains teh given bytenr
+ * return the block group that contains the given bytenr
*/
struct btrfs_block_group_cache *btrfs_lookup_block_group(
struct btrfs_fs_info *info,
return cache;
}
-static inline void put_block_group(struct btrfs_block_group_cache *cache)
+void btrfs_put_block_group(struct btrfs_block_group_cache *cache)
{
if (atomic_dec_and_test(&cache->count))
kfree(cache);
div_factor(cache->key.offset, factor)) {
group_start = cache->key.objectid;
spin_unlock(&cache->lock);
- put_block_group(cache);
+ btrfs_put_block_group(cache);
goto found;
}
}
spin_unlock(&cache->lock);
- put_block_group(cache);
+ btrfs_put_block_group(cache);
cond_resched();
}
if (!wrapped) {
if (!block_group || block_group->ro)
readonly = 1;
if (block_group)
- put_block_group(block_group);
+ btrfs_put_block_group(block_group);
return readonly;
}
printk(KERN_ERR "no space left, need %llu, %llu delalloc bytes"
", %llu bytes_used, %llu bytes_reserved, "
"%llu bytes_pinned, %llu bytes_readonly, %llu may use"
- "%llu total\n", bytes, data_sinfo->bytes_delalloc,
- data_sinfo->bytes_used, data_sinfo->bytes_reserved,
- data_sinfo->bytes_pinned, data_sinfo->bytes_readonly,
- data_sinfo->bytes_may_use, data_sinfo->total_bytes);
+ "%llu total\n", (unsigned long long)bytes,
+ (unsigned long long)data_sinfo->bytes_delalloc,
+ (unsigned long long)data_sinfo->bytes_used,
+ (unsigned long long)data_sinfo->bytes_reserved,
+ (unsigned long long)data_sinfo->bytes_pinned,
+ (unsigned long long)data_sinfo->bytes_readonly,
+ (unsigned long long)data_sinfo->bytes_may_use,
+ (unsigned long long)data_sinfo->total_bytes);
return -ENOSPC;
}
data_sinfo->bytes_may_use += bytes;
spin_unlock(&info->lock);
}
+static void force_metadata_allocation(struct btrfs_fs_info *info)
+{
+ struct list_head *head = &info->space_info;
+ struct btrfs_space_info *found;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(found, head, list) {
+ if (found->flags & BTRFS_BLOCK_GROUP_METADATA)
+ found->force_alloc = 1;
+ }
+ rcu_read_unlock();
+}
+
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;
+ struct btrfs_fs_info *fs_info = extent_root->fs_info;
u64 thresh;
int ret = 0;
- mutex_lock(&extent_root->fs_info->chunk_mutex);
+ mutex_lock(&fs_info->chunk_mutex);
flags = btrfs_reduce_alloc_profile(extent_root, flags);
}
spin_unlock(&space_info->lock);
+ /*
+ * if we're doing a data chunk, go ahead and make sure that
+ * we keep a reasonable number of metadata chunks allocated in the
+ * FS as well.
+ */
+ if (flags & BTRFS_BLOCK_GROUP_DATA) {
+ fs_info->data_chunk_allocations++;
+ if (!(fs_info->data_chunk_allocations %
+ fs_info->metadata_ratio))
+ force_metadata_allocation(fs_info);
+ }
+
ret = btrfs_alloc_chunk(trans, extent_root, flags);
if (ret)
space_info->full = 1;
WARN_ON(ret);
}
}
- put_block_group(cache);
+ btrfs_put_block_group(cache);
total -= num_bytes;
bytenr += num_bytes;
}
return 0;
bytenr = cache->key.objectid;
- put_block_group(cache);
+ btrfs_put_block_group(cache);
return bytenr;
}
struct btrfs_block_group_cache *cache;
struct btrfs_fs_info *fs_info = root->fs_info;
- WARN_ON(!mutex_is_locked(&root->fs_info->pinned_mutex));
if (pin) {
set_extent_dirty(&fs_info->pinned_extents,
bytenr, bytenr + num - 1, GFP_NOFS);
clear_extent_dirty(&fs_info->pinned_extents,
bytenr, bytenr + num - 1, GFP_NOFS);
}
- mutex_unlock(&root->fs_info->pinned_mutex);
while (num > 0) {
cache = btrfs_lookup_block_group(fs_info, bytenr);
if (cache->cached)
btrfs_add_free_space(cache, bytenr, len);
}
- put_block_group(cache);
+ btrfs_put_block_group(cache);
bytenr += len;
num -= len;
}
}
spin_unlock(&cache->lock);
spin_unlock(&cache->space_info->lock);
- put_block_group(cache);
+ btrfs_put_block_group(cache);
bytenr += len;
num -= len;
}
struct extent_io_tree *pinned_extents = &root->fs_info->pinned_extents;
int ret;
- mutex_lock(&root->fs_info->pinned_mutex);
while (1) {
ret = find_first_extent_bit(pinned_extents, last,
&start, &end, EXTENT_DIRTY);
set_extent_dirty(copy, start, end, GFP_NOFS);
last = end + 1;
}
- mutex_unlock(&root->fs_info->pinned_mutex);
return 0;
}
int ret;
while (1) {
- mutex_lock(&root->fs_info->pinned_mutex);
ret = find_first_extent_bit(unpin, 0, &start, &end,
EXTENT_DIRTY);
if (ret)
cond_resched();
}
- mutex_unlock(&root->fs_info->pinned_mutex);
return ret;
}
free_extent_buffer(buf);
pinit:
btrfs_set_path_blocking(path);
- mutex_lock(&root->fs_info->pinned_mutex);
/* unlocks the pinned mutex */
btrfs_update_pinned_extents(root, bytenr, num_bytes, 1);
*/
if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID &&
owner_objectid < BTRFS_FIRST_FREE_OBJECTID) {
- mutex_lock(&root->fs_info->pinned_mutex);
-
/* unlocks the pinned mutex */
btrfs_update_pinned_extents(root, bytenr, num_bytes, 1);
update_reserved_extents(root, bytenr, num_bytes, 0);
{
int ret = 0;
struct btrfs_root *root = orig_root->fs_info->extent_root;
- u64 total_needed = num_bytes;
- u64 *last_ptr = NULL;
- u64 last_wanted = 0;
+ struct btrfs_free_cluster *last_ptr = NULL;
struct btrfs_block_group_cache *block_group = NULL;
- int chunk_alloc_done = 0;
int empty_cluster = 2 * 1024 * 1024;
int allowed_chunk_alloc = 0;
- struct list_head *head = NULL, *cur = NULL;
- int loop = 0;
- int extra_loop = 0;
struct btrfs_space_info *space_info;
+ int last_ptr_loop = 0;
+ int loop = 0;
WARN_ON(num_bytes < root->sectorsize);
btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY);
ins->objectid = 0;
ins->offset = 0;
+ space_info = __find_space_info(root->fs_info, data);
+
if (orig_root->ref_cows || empty_size)
allowed_chunk_alloc = 1;
if (data & BTRFS_BLOCK_GROUP_METADATA) {
- last_ptr = &root->fs_info->last_alloc;
+ last_ptr = &root->fs_info->meta_alloc_cluster;
if (!btrfs_test_opt(root, SSD))
empty_cluster = 64 * 1024;
}
- if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD))
- last_ptr = &root->fs_info->last_data_alloc;
+ if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD)) {
+ last_ptr = &root->fs_info->data_alloc_cluster;
+ }
if (last_ptr) {
- if (*last_ptr) {
- hint_byte = *last_ptr;
- last_wanted = *last_ptr;
- } else
- empty_size += empty_cluster;
- } else {
- empty_cluster = 0;
+ spin_lock(&last_ptr->lock);
+ if (last_ptr->block_group)
+ hint_byte = last_ptr->window_start;
+ spin_unlock(&last_ptr->lock);
}
+
search_start = max(search_start, first_logical_byte(root, 0));
search_start = max(search_start, hint_byte);
- if (last_wanted && search_start != last_wanted) {
- last_wanted = 0;
- empty_size += empty_cluster;
+ if (!last_ptr) {
+ empty_cluster = 0;
+ loop = 1;
}
- total_needed += empty_size;
- block_group = btrfs_lookup_block_group(root->fs_info, search_start);
- if (!block_group)
- block_group = btrfs_lookup_first_block_group(root->fs_info,
- search_start);
- space_info = __find_space_info(root->fs_info, data);
+ if (search_start == hint_byte) {
+ block_group = btrfs_lookup_block_group(root->fs_info,
+ search_start);
+ if (block_group && block_group_bits(block_group, data)) {
+ down_read(&space_info->groups_sem);
+ if (list_empty(&block_group->list) ||
+ block_group->ro) {
+ /*
+ * someone is removing this block group,
+ * we can't jump into the have_block_group
+ * target because our list pointers are not
+ * valid
+ */
+ btrfs_put_block_group(block_group);
+ up_read(&space_info->groups_sem);
+ } else
+ goto have_block_group;
+ } else if (block_group) {
+ btrfs_put_block_group(block_group);
+ }
+ }
+search:
down_read(&space_info->groups_sem);
- while (1) {
- struct btrfs_free_space *free_space;
- /*
- * the only way this happens if our hint points to a block
- * group thats not of the proper type, while looping this
- * should never happen
- */
- if (empty_size)
- extra_loop = 1;
+ list_for_each_entry(block_group, &space_info->block_groups, list) {
+ u64 offset;
- if (!block_group)
- goto new_group_no_lock;
+ atomic_inc(&block_group->count);
+ search_start = block_group->key.objectid;
+have_block_group:
if (unlikely(!block_group->cached)) {
mutex_lock(&block_group->cache_mutex);
ret = cache_block_group(root, block_group);
mutex_unlock(&block_group->cache_mutex);
- if (ret)
+ if (ret) {
+ btrfs_put_block_group(block_group);
break;
+ }
}
- mutex_lock(&block_group->alloc_mutex);
- if (unlikely(!block_group_bits(block_group, data)))
- goto new_group;
-
if (unlikely(block_group->ro))
- goto new_group;
+ goto loop;
- free_space = btrfs_find_free_space(block_group, search_start,
- total_needed);
- if (free_space) {
- u64 start = block_group->key.objectid;
- u64 end = block_group->key.objectid +
- block_group->key.offset;
+ if (last_ptr) {
+ /*
+ * the refill lock keeps out other
+ * people trying to start a new cluster
+ */
+ spin_lock(&last_ptr->refill_lock);
+ if (last_ptr->block_group &&
+ (last_ptr->block_group->ro ||
+ !block_group_bits(last_ptr->block_group, data))) {
+ offset = 0;
+ goto refill_cluster;
+ }
- search_start = stripe_align(root, free_space->offset);
+ offset = btrfs_alloc_from_cluster(block_group, last_ptr,
+ num_bytes, search_start);
+ if (offset) {
+ /* we have a block, we're done */
+ spin_unlock(&last_ptr->refill_lock);
+ goto checks;
+ }
- /* move on to the next group */
- if (search_start + num_bytes >= search_end)
- goto new_group;
+ spin_lock(&last_ptr->lock);
+ /*
+ * whoops, this cluster doesn't actually point to
+ * this block group. Get a ref on the block
+ * group is does point to and try again
+ */
+ if (!last_ptr_loop && last_ptr->block_group &&
+ last_ptr->block_group != block_group) {
- /* move on to the next group */
- if (search_start + num_bytes > end)
- goto new_group;
+ btrfs_put_block_group(block_group);
+ block_group = last_ptr->block_group;
+ atomic_inc(&block_group->count);
+ spin_unlock(&last_ptr->lock);
+ spin_unlock(&last_ptr->refill_lock);
- if (last_wanted && search_start != last_wanted) {
- total_needed += empty_cluster;
- empty_size += empty_cluster;
- last_wanted = 0;
+ last_ptr_loop = 1;
+ search_start = block_group->key.objectid;
/*
- * if search_start is still in this block group
- * then we just re-search this block group
+ * we know this block group is properly
+ * in the list because
+ * btrfs_remove_block_group, drops the
+ * cluster before it removes the block
+ * group from the list
*/
- if (search_start >= start &&
- search_start < end) {
- mutex_unlock(&block_group->alloc_mutex);
- continue;
- }
-
- /* else we go to the next block group */
- goto new_group;
+ goto have_block_group;
}
+ spin_unlock(&last_ptr->lock);
+refill_cluster:
+ /*
+ * this cluster didn't work out, free it and
+ * start over
+ */
+ btrfs_return_cluster_to_free_space(NULL, last_ptr);
- if (exclude_nr > 0 &&
- (search_start + num_bytes > exclude_start &&
- search_start < exclude_start + exclude_nr)) {
- search_start = exclude_start + exclude_nr;
+ last_ptr_loop = 0;
+
+ /* allocate a cluster in this block group */
+ ret = btrfs_find_space_cluster(trans,
+ block_group, last_ptr,
+ offset, num_bytes,
+ empty_cluster + empty_size);
+ if (ret == 0) {
/*
- * if search_start is still in this block group
- * then we just re-search this block group
+ * now pull our allocation out of this
+ * cluster
*/
- if (search_start >= start &&
- search_start < end) {
- mutex_unlock(&block_group->alloc_mutex);
- last_wanted = 0;
- continue;
+ offset = btrfs_alloc_from_cluster(block_group,
+ last_ptr, num_bytes,
+ search_start);
+ if (offset) {
+ /* we found one, proceed */
+ spin_unlock(&last_ptr->refill_lock);
+ goto checks;
}
-
- /* else we go to the next block group */
- goto new_group;
}
+ /*
+ * at this point we either didn't find a cluster
+ * or we weren't able to allocate a block from our
+ * cluster. Free the cluster we've been trying
+ * to use, and go to the next block group
+ */
+ if (loop < 2) {
+ btrfs_return_cluster_to_free_space(NULL,
+ last_ptr);
+ spin_unlock(&last_ptr->refill_lock);
+ goto loop;
+ }
+ spin_unlock(&last_ptr->refill_lock);
+ }
- ins->objectid = search_start;
- ins->offset = num_bytes;
+ offset = btrfs_find_space_for_alloc(block_group, search_start,
+ num_bytes, empty_size);
+ if (!offset)
+ goto loop;
+checks:
+ search_start = stripe_align(root, offset);
+
+ /* move on to the next group */
+ if (search_start + num_bytes >= search_end) {
+ btrfs_add_free_space(block_group, offset, num_bytes);
+ goto loop;
+ }
- btrfs_remove_free_space_lock(block_group, search_start,
- num_bytes);
- /* we are all good, lets return */
- mutex_unlock(&block_group->alloc_mutex);
- break;
+ /* move on to the next group */
+ if (search_start + num_bytes >
+ block_group->key.objectid + block_group->key.offset) {
+ btrfs_add_free_space(block_group, offset, num_bytes);
+ goto loop;
}
-new_group:
- mutex_unlock(&block_group->alloc_mutex);
- put_block_group(block_group);
- block_group = NULL;
-new_group_no_lock:
- /* don't try to compare new allocations against the
- * last allocation any more
- */
- last_wanted = 0;
- /*
- * Here's how this works.
- * loop == 0: we were searching a block group via a hint
- * and didn't find anything, so we start at
- * the head of the block groups and keep searching
- * loop == 1: we're searching through all of the block groups
- * if we hit the head again we have searched
- * all of the block groups for this space and we
- * need to try and allocate, if we cant error out.
- * loop == 2: we allocated more space and are looping through
- * all of the block groups again.
- */
- if (loop == 0) {
- head = &space_info->block_groups;
- cur = head->next;
- loop++;
- } else if (loop == 1 && cur == head) {
- int keep_going;
-
- /* at this point we give up on the empty_size
- * allocations and just try to allocate the min
- * space.
- *
- * The extra_loop field was set if an empty_size
- * allocation was attempted above, and if this
- * is try we need to try the loop again without
- * the additional empty_size.
+ if (exclude_nr > 0 &&
+ (search_start + num_bytes > exclude_start &&
+ search_start < exclude_start + exclude_nr)) {
+ search_start = exclude_start + exclude_nr;
+
+ btrfs_add_free_space(block_group, offset, num_bytes);
+ /*
+ * if search_start is still in this block group
+ * then we just re-search this block group
*/
- total_needed -= empty_size;
- empty_size = 0;
- keep_going = extra_loop;
- loop++;
+ if (search_start >= block_group->key.objectid &&
+ search_start < (block_group->key.objectid +
+ block_group->key.offset))
+ goto have_block_group;
+ goto loop;
+ }
- if (allowed_chunk_alloc && !chunk_alloc_done) {
- up_read(&space_info->groups_sem);
- ret = do_chunk_alloc(trans, root, num_bytes +
- 2 * 1024 * 1024, data, 1);
- down_read(&space_info->groups_sem);
- if (ret < 0)
- goto loop_check;
- head = &space_info->block_groups;
- /*
- * we've allocated a new chunk, keep
- * trying
- */
- keep_going = 1;
- chunk_alloc_done = 1;
- } else if (!allowed_chunk_alloc) {
- space_info->force_alloc = 1;
- }
-loop_check:
- if (keep_going) {
- cur = head->next;
- extra_loop = 0;
- } else {
- break;
- }
- } else if (cur == head) {
- break;
+ ins->objectid = search_start;
+ ins->offset = num_bytes;
+
+ if (offset < search_start)
+ btrfs_add_free_space(block_group, offset,
+ search_start - offset);
+ BUG_ON(offset > search_start);
+
+ /* we are all good, lets return */
+ break;
+loop:
+ btrfs_put_block_group(block_group);
+ }
+ up_read(&space_info->groups_sem);
+
+ /* loop == 0, try to find a clustered alloc in every block group
+ * loop == 1, try again after forcing a chunk allocation
+ * loop == 2, set empty_size and empty_cluster to 0 and try again
+ */
+ if (!ins->objectid && loop < 3 &&
+ (empty_size || empty_cluster || allowed_chunk_alloc)) {
+ if (loop >= 2) {
+ empty_size = 0;
+ empty_cluster = 0;
}
- block_group = list_entry(cur, struct btrfs_block_group_cache,
- list);
- atomic_inc(&block_group->count);
+ if (allowed_chunk_alloc) {
+ ret = do_chunk_alloc(trans, root, num_bytes +
+ 2 * 1024 * 1024, data, 1);
+ allowed_chunk_alloc = 0;
+ } else {
+ space_info->force_alloc = 1;
+ }
- search_start = block_group->key.objectid;
- cur = cur->next;
+ if (loop < 3) {
+ loop++;
+ goto search;
+ }
+ ret = -ENOSPC;
+ } else if (!ins->objectid) {
+ ret = -ENOSPC;
}
/* we found what we needed */
if (!(data & BTRFS_BLOCK_GROUP_DATA))
trans->block_group = block_group->key.objectid;
- if (last_ptr)
- *last_ptr = ins->objectid + ins->offset;
+ btrfs_put_block_group(block_group);
ret = 0;
- } else if (!ret) {
- printk(KERN_ERR "btrfs searching for %llu bytes, "
- "num_bytes %llu, loop %d, allowed_alloc %d\n",
- (unsigned long long)total_needed,
- (unsigned long long)num_bytes,
- loop, allowed_chunk_alloc);
- ret = -ENOSPC;
}
- if (block_group)
- put_block_group(block_group);
- up_read(&space_info->groups_sem);
return ret;
}
info->bytes_pinned - info->bytes_reserved),
(info->full) ? "" : "not ");
printk(KERN_INFO "space_info total=%llu, pinned=%llu, delalloc=%llu,"
- " may_use=%llu, used=%llu\n", info->total_bytes,
- info->bytes_pinned, info->bytes_delalloc, info->bytes_may_use,
- info->bytes_used);
+ " may_use=%llu, used=%llu\n",
+ (unsigned long long)info->total_bytes,
+ (unsigned long long)info->bytes_pinned,
+ (unsigned long long)info->bytes_delalloc,
+ (unsigned long long)info->bytes_may_use,
+ (unsigned long long)info->bytes_used);
down_read(&info->groups_sem);
list_for_each_entry(cache, &info->block_groups, list) {
ret = btrfs_discard_extent(root, start, len);
btrfs_add_free_space(cache, start, len);
- put_block_group(cache);
+ btrfs_put_block_group(cache);
update_reserved_extents(root, start, len, 0);
return ret;
ret = btrfs_remove_free_space(block_group, ins->objectid,
ins->offset);
BUG_ON(ret);
- put_block_group(block_group);
+ btrfs_put_block_group(block_group);
ret = __btrfs_alloc_reserved_extent(trans, root, parent, root_objectid,
ref_generation, owner, ins, 1);
return ret;
WARN_ON(block_group->reserved > 0);
WARN_ON(btrfs_block_group_used(&block_group->item) > 0);
spin_unlock(&block_group->lock);
- put_block_group(block_group);
+ btrfs_put_block_group(block_group);
ret = 0;
out:
btrfs_free_path(path);
atomic_set(&cache->count, 1);
spin_lock_init(&cache->lock);
- mutex_init(&cache->alloc_mutex);
+ spin_lock_init(&cache->tree_lock);
mutex_init(&cache->cache_mutex);
INIT_LIST_HEAD(&cache->list);
+ INIT_LIST_HEAD(&cache->cluster_list);
read_extent_buffer(leaf, &cache->item,
btrfs_item_ptr_offset(leaf, path->slots[0]),
sizeof(cache->item));
cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
atomic_set(&cache->count, 1);
spin_lock_init(&cache->lock);
- mutex_init(&cache->alloc_mutex);
+ spin_lock_init(&cache->tree_lock);
mutex_init(&cache->cache_mutex);
INIT_LIST_HEAD(&cache->list);
+ INIT_LIST_HEAD(&cache->cluster_list);
btrfs_set_block_group_used(&cache->item, bytes_used);
btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid);
{
struct btrfs_path *path;
struct btrfs_block_group_cache *block_group;
+ struct btrfs_free_cluster *cluster;
struct btrfs_key key;
int ret;
memcpy(&key, &block_group->key, sizeof(key));
+ /* make sure this block group isn't part of an allocation cluster */
+ cluster = &root->fs_info->data_alloc_cluster;
+ spin_lock(&cluster->refill_lock);
+ btrfs_return_cluster_to_free_space(block_group, cluster);
+ spin_unlock(&cluster->refill_lock);
+
+ /*
+ * make sure this block group isn't part of a metadata
+ * allocation cluster
+ */
+ cluster = &root->fs_info->meta_alloc_cluster;
+ spin_lock(&cluster->refill_lock);
+ btrfs_return_cluster_to_free_space(block_group, cluster);
+ spin_unlock(&cluster->refill_lock);
+
path = btrfs_alloc_path();
BUG_ON(!path);
spin_unlock(&root->fs_info->block_group_cache_lock);
btrfs_remove_free_space_cache(block_group);
down_write(&block_group->space_info->groups_sem);
- list_del(&block_group->list);
+ /*
+ * we must use list_del_init so people can check to see if they
+ * are still on the list after taking the semaphore
+ */
+ list_del_init(&block_group->list);
up_write(&block_group->space_info->groups_sem);
spin_lock(&block_group->space_info->lock);
spin_unlock(&block_group->space_info->lock);
block_group->space_info->full = 0;
- put_block_group(block_group);
- put_block_group(block_group);
+ btrfs_put_block_group(block_group);
+ btrfs_put_block_group(block_group);
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret > 0)
Code Review / linux-2.6.git / blobdiff