#include <linux/pagemap.h>
#include <linux/writeback.h>
#include <linux/blkdev.h>
-#include <linux/version.h>
+#include <linux/sort.h>
+#include <linux/rcupdate.h>
#include "compat.h"
#include "hash.h"
#include "crc32c.h"
#include "volumes.h"
#include "locking.h"
#include "ref-cache.h"
-#include "compat.h"
#define PENDING_EXTENT_INSERT 0
#define PENDING_EXTENT_DELETE 1
int del;
};
-static int finish_current_insert(struct btrfs_trans_handle *trans,
- struct btrfs_root *extent_root, int all);
-static int del_pending_extents(struct btrfs_trans_handle *trans,
- struct btrfs_root *extent_root, int all);
-static int pin_down_bytes(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- u64 bytenr, u64 num_bytes, int is_data);
+static int __btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 parent,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner, struct btrfs_key *ins,
+ int ref_mod);
+static int update_reserved_extents(struct btrfs_root *root,
+ u64 bytenr, u64 num, int reserve);
static int update_block_group(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 bytenr, u64 num_bytes, int alloc,
int mark_free);
+static noinline int __btrfs_free_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 bytenr, u64 num_bytes, u64 parent,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner_objectid, int pin,
+ int ref_to_drop);
+
+static int do_chunk_alloc(struct btrfs_trans_handle *trans,
+ struct btrfs_root *extent_root, u64 alloc_bytes,
+ u64 flags, int force);
static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits)
{
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)
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(found, head, list) {
+ if (found->flags == flags) {
+ rcu_read_unlock();
return found;
+ }
}
+ rcu_read_unlock();
return NULL;
}
+/*
+ * after adding space to the filesystem, we need to clear the full flags
+ * on all the space infos.
+ */
+void btrfs_clear_space_info_full(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)
+ found->full = 0;
+ rcu_read_unlock();
+}
+
static u64 div_factor(u64 num, int factor)
{
if (factor == 10)
return ret;
}
-/*
- * updates all the backrefs that are pending on update_list for the
- * extent_root
- */
-static noinline int update_backrefs(struct btrfs_trans_handle *trans,
- struct btrfs_root *extent_root,
- struct btrfs_path *path,
- struct list_head *update_list)
-{
- struct btrfs_key key;
- struct btrfs_extent_ref *ref;
- struct btrfs_fs_info *info = extent_root->fs_info;
- struct pending_extent_op *op;
- struct extent_buffer *leaf;
- int ret = 0;
- struct list_head *cur = update_list->next;
- u64 ref_objectid;
- u64 ref_root = extent_root->root_key.objectid;
-
- op = list_entry(cur, struct pending_extent_op, list);
-
-search:
- key.objectid = op->bytenr;
- key.type = BTRFS_EXTENT_REF_KEY;
- key.offset = op->orig_parent;
-
- ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 1);
- BUG_ON(ret);
-
- leaf = path->nodes[0];
-
-loop:
- ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref);
-
- ref_objectid = btrfs_ref_objectid(leaf, ref);
-
- if (btrfs_ref_root(leaf, ref) != ref_root ||
- btrfs_ref_generation(leaf, ref) != op->orig_generation ||
- (ref_objectid != op->level &&
- ref_objectid != BTRFS_MULTIPLE_OBJECTIDS)) {
- printk(KERN_ERR "btrfs couldn't find %llu, parent %llu, "
- "root %llu, owner %u\n",
- (unsigned long long)op->bytenr,
- (unsigned long long)op->orig_parent,
- (unsigned long long)ref_root, op->level);
- btrfs_print_leaf(extent_root, leaf);
- BUG();
- }
-
- key.objectid = op->bytenr;
- key.offset = op->parent;
- key.type = BTRFS_EXTENT_REF_KEY;
- ret = btrfs_set_item_key_safe(trans, extent_root, path, &key);
- BUG_ON(ret);
- ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref);
- btrfs_set_ref_generation(leaf, ref, op->generation);
-
- cur = cur->next;
-
- list_del_init(&op->list);
- unlock_extent(&info->extent_ins, op->bytenr,
- op->bytenr + op->num_bytes - 1, GFP_NOFS);
- kfree(op);
-
- if (cur == update_list) {
- btrfs_mark_buffer_dirty(path->nodes[0]);
- btrfs_release_path(extent_root, path);
- goto out;
- }
-
- op = list_entry(cur, struct pending_extent_op, list);
-
- path->slots[0]++;
- while (path->slots[0] < btrfs_header_nritems(leaf)) {
- btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
- if (key.objectid == op->bytenr &&
- key.type == BTRFS_EXTENT_REF_KEY)
- goto loop;
- path->slots[0]++;
- }
-
- btrfs_mark_buffer_dirty(path->nodes[0]);
- btrfs_release_path(extent_root, path);
- goto search;
-
-out:
- return 0;
-}
-
-static noinline int insert_extents(struct btrfs_trans_handle *trans,
- struct btrfs_root *extent_root,
- struct btrfs_path *path,
- struct list_head *insert_list, int nr)
-{
- struct btrfs_key *keys;
- u32 *data_size;
- struct pending_extent_op *op;
- struct extent_buffer *leaf;
- struct list_head *cur = insert_list->next;
- struct btrfs_fs_info *info = extent_root->fs_info;
- u64 ref_root = extent_root->root_key.objectid;
- int i = 0, last = 0, ret;
- int total = nr * 2;
-
- if (!nr)
- return 0;
-
- keys = kzalloc(total * sizeof(struct btrfs_key), GFP_NOFS);
- if (!keys)
- return -ENOMEM;
-
- data_size = kzalloc(total * sizeof(u32), GFP_NOFS);
- if (!data_size) {
- kfree(keys);
- return -ENOMEM;
- }
-
- list_for_each_entry(op, insert_list, list) {
- keys[i].objectid = op->bytenr;
- keys[i].offset = op->num_bytes;
- keys[i].type = BTRFS_EXTENT_ITEM_KEY;
- data_size[i] = sizeof(struct btrfs_extent_item);
- i++;
-
- keys[i].objectid = op->bytenr;
- keys[i].offset = op->parent;
- keys[i].type = BTRFS_EXTENT_REF_KEY;
- data_size[i] = sizeof(struct btrfs_extent_ref);
- i++;
- }
-
- op = list_entry(cur, struct pending_extent_op, list);
- i = 0;
- while (i < total) {
- int c;
- ret = btrfs_insert_some_items(trans, extent_root, path,
- keys+i, data_size+i, total-i);
- BUG_ON(ret < 0);
-
- if (last && ret > 1)
- BUG();
-
- leaf = path->nodes[0];
- for (c = 0; c < ret; c++) {
- int ref_first = keys[i].type == BTRFS_EXTENT_REF_KEY;
-
- /*
- * if the first item we inserted was a backref, then
- * the EXTENT_ITEM will be the odd c's, else it will
- * be the even c's
- */
- if ((ref_first && (c % 2)) ||
- (!ref_first && !(c % 2))) {
- struct btrfs_extent_item *itm;
-
- itm = btrfs_item_ptr(leaf, path->slots[0] + c,
- struct btrfs_extent_item);
- btrfs_set_extent_refs(path->nodes[0], itm, 1);
- op->del++;
- } else {
- struct btrfs_extent_ref *ref;
-
- ref = btrfs_item_ptr(leaf, path->slots[0] + c,
- struct btrfs_extent_ref);
- btrfs_set_ref_root(leaf, ref, ref_root);
- btrfs_set_ref_generation(leaf, ref,
- op->generation);
- btrfs_set_ref_objectid(leaf, ref, op->level);
- btrfs_set_ref_num_refs(leaf, ref, 1);
- op->del++;
- }
-
- /*
- * using del to see when its ok to free up the
- * pending_extent_op. In the case where we insert the
- * last item on the list in order to help do batching
- * we need to not free the extent op until we actually
- * insert the extent_item
- */
- if (op->del == 2) {
- unlock_extent(&info->extent_ins, op->bytenr,
- op->bytenr + op->num_bytes - 1,
- GFP_NOFS);
- cur = cur->next;
- list_del_init(&op->list);
- kfree(op);
- if (cur != insert_list)
- op = list_entry(cur,
- struct pending_extent_op,
- list);
- }
- }
- btrfs_mark_buffer_dirty(leaf);
- btrfs_release_path(extent_root, path);
-
- /*
- * Ok backref's and items usually go right next to eachother,
- * but if we could only insert 1 item that means that we
- * inserted on the end of a leaf, and we have no idea what may
- * be on the next leaf so we just play it safe. In order to
- * try and help this case we insert the last thing on our
- * insert list so hopefully it will end up being the last
- * thing on the leaf and everything else will be before it,
- * which will let us insert a whole bunch of items at the same
- * time.
- */
- if (ret == 1 && !last && (i + ret < total)) {
- /*
- * last: where we will pick up the next time around
- * i: our current key to insert, will be total - 1
- * cur: the current op we are screwing with
- * op: duh
- */
- last = i + ret;
- i = total - 1;
- cur = insert_list->prev;
- op = list_entry(cur, struct pending_extent_op, list);
- } else if (last) {
- /*
- * ok we successfully inserted the last item on the
- * list, lets reset everything
- *
- * i: our current key to insert, so where we left off
- * last time
- * last: done with this
- * cur: the op we are messing with
- * op: duh
- * total: since we inserted the last key, we need to
- * decrement total so we dont overflow
- */
- i = last;
- last = 0;
- total--;
- if (i < total) {
- cur = insert_list->next;
- op = list_entry(cur, struct pending_extent_op,
- list);
- }
- } else {
- i += ret;
- }
-
- cond_resched();
- }
- ret = 0;
- kfree(keys);
- kfree(data_size);
- return ret;
-}
-
static noinline int insert_extent_backref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
u64 bytenr, u64 parent,
u64 ref_root, u64 ref_generation,
- u64 owner_objectid)
+ u64 owner_objectid,
+ int refs_to_add)
{
struct btrfs_key key;
struct extent_buffer *leaf;
btrfs_set_ref_root(leaf, ref, ref_root);
btrfs_set_ref_generation(leaf, ref, ref_generation);
btrfs_set_ref_objectid(leaf, ref, owner_objectid);
- btrfs_set_ref_num_refs(leaf, ref, 1);
+ btrfs_set_ref_num_refs(leaf, ref, refs_to_add);
} else if (ret == -EEXIST) {
u64 existing_owner;
+
BUG_ON(owner_objectid < BTRFS_FIRST_FREE_OBJECTID);
leaf = path->nodes[0];
ref = btrfs_item_ptr(leaf, path->slots[0],
num_refs = btrfs_ref_num_refs(leaf, ref);
BUG_ON(num_refs == 0);
- btrfs_set_ref_num_refs(leaf, ref, num_refs + 1);
+ btrfs_set_ref_num_refs(leaf, ref, num_refs + refs_to_add);
existing_owner = btrfs_ref_objectid(leaf, ref);
if (existing_owner != owner_objectid &&
} else {
goto out;
}
+ btrfs_unlock_up_safe(path, 1);
btrfs_mark_buffer_dirty(path->nodes[0]);
out:
btrfs_release_path(root, path);
static noinline int remove_extent_backref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
- struct btrfs_path *path)
+ struct btrfs_path *path,
+ int refs_to_drop)
{
struct extent_buffer *leaf;
struct btrfs_extent_ref *ref;
leaf = path->nodes[0];
ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref);
num_refs = btrfs_ref_num_refs(leaf, ref);
- BUG_ON(num_refs == 0);
- num_refs -= 1;
+ BUG_ON(num_refs < refs_to_drop);
+ num_refs -= refs_to_drop;
if (num_refs == 0) {
ret = btrfs_del_item(trans, root, path);
} else {
#endif
}
-static noinline int free_extents(struct btrfs_trans_handle *trans,
- struct btrfs_root *extent_root,
- struct list_head *del_list)
-{
- struct btrfs_fs_info *info = extent_root->fs_info;
- struct btrfs_path *path;
- struct btrfs_key key, found_key;
- struct extent_buffer *leaf;
- struct list_head *cur;
- struct pending_extent_op *op;
- struct btrfs_extent_item *ei;
- int ret, num_to_del, extent_slot = 0, found_extent = 0;
- u32 refs;
- u64 bytes_freed = 0;
-
- path = btrfs_alloc_path();
- if (!path)
- return -ENOMEM;
- path->reada = 1;
-
-search:
- /* search for the backref for the current ref we want to delete */
- cur = del_list->next;
- op = list_entry(cur, struct pending_extent_op, list);
- ret = lookup_extent_backref(trans, extent_root, path, op->bytenr,
- op->orig_parent,
- extent_root->root_key.objectid,
- op->orig_generation, op->level, 1);
- if (ret) {
- printk(KERN_ERR "btrfs unable to find backref byte nr %llu "
- "root %llu gen %llu owner %u\n",
- (unsigned long long)op->bytenr,
- (unsigned long long)extent_root->root_key.objectid,
- (unsigned long long)op->orig_generation, op->level);
- btrfs_print_leaf(extent_root, path->nodes[0]);
- WARN_ON(1);
- goto out;
- }
-
- extent_slot = path->slots[0];
- num_to_del = 1;
- found_extent = 0;
-
- /*
- * if we aren't the first item on the leaf we can move back one and see
- * if our ref is right next to our extent item
- */
- if (likely(extent_slot)) {
- extent_slot--;
- btrfs_item_key_to_cpu(path->nodes[0], &found_key,
- extent_slot);
- if (found_key.objectid == op->bytenr &&
- found_key.type == BTRFS_EXTENT_ITEM_KEY &&
- found_key.offset == op->num_bytes) {
- num_to_del++;
- found_extent = 1;
- }
- }
-
- /*
- * if we didn't find the extent we need to delete the backref and then
- * search for the extent item key so we can update its ref count
- */
- if (!found_extent) {
- key.objectid = op->bytenr;
- key.type = BTRFS_EXTENT_ITEM_KEY;
- key.offset = op->num_bytes;
-
- ret = remove_extent_backref(trans, extent_root, path);
- BUG_ON(ret);
- btrfs_release_path(extent_root, path);
- ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1);
- BUG_ON(ret);
- extent_slot = path->slots[0];
- }
-
- /* this is where we update the ref count for the extent */
- leaf = path->nodes[0];
- ei = btrfs_item_ptr(leaf, extent_slot, struct btrfs_extent_item);
- refs = btrfs_extent_refs(leaf, ei);
- BUG_ON(refs == 0);
- refs--;
- btrfs_set_extent_refs(leaf, ei, refs);
-
- btrfs_mark_buffer_dirty(leaf);
-
- /*
- * This extent needs deleting. The reason cur_slot is extent_slot +
- * num_to_del is because extent_slot points to the slot where the extent
- * is, and if the backref was not right next to the extent we will be
- * deleting at least 1 item, and will want to start searching at the
- * slot directly next to extent_slot. However if we did find the
- * backref next to the extent item them we will be deleting at least 2
- * items and will want to start searching directly after the ref slot
- */
- if (!refs) {
- struct list_head *pos, *n, *end;
- int cur_slot = extent_slot+num_to_del;
- u64 super_used;
- u64 root_used;
-
- path->slots[0] = extent_slot;
- bytes_freed = op->num_bytes;
-
- mutex_lock(&info->pinned_mutex);
- ret = pin_down_bytes(trans, extent_root, op->bytenr,
- op->num_bytes, op->level >=
- BTRFS_FIRST_FREE_OBJECTID);
- mutex_unlock(&info->pinned_mutex);
- BUG_ON(ret < 0);
- op->del = ret;
-
- /*
- * we need to see if we can delete multiple things at once, so
- * start looping through the list of extents we are wanting to
- * delete and see if their extent/backref's are right next to
- * eachother and the extents only have 1 ref
- */
- for (pos = cur->next; pos != del_list; pos = pos->next) {
- struct pending_extent_op *tmp;
-
- tmp = list_entry(pos, struct pending_extent_op, list);
-
- /* we only want to delete extent+ref at this stage */
- if (cur_slot >= btrfs_header_nritems(leaf) - 1)
- break;
-
- btrfs_item_key_to_cpu(leaf, &found_key, cur_slot);
- if (found_key.objectid != tmp->bytenr ||
- found_key.type != BTRFS_EXTENT_ITEM_KEY ||
- found_key.offset != tmp->num_bytes)
- break;
-
- /* check to make sure this extent only has one ref */
- ei = btrfs_item_ptr(leaf, cur_slot,
- struct btrfs_extent_item);
- if (btrfs_extent_refs(leaf, ei) != 1)
- break;
-
- btrfs_item_key_to_cpu(leaf, &found_key, cur_slot+1);
- if (found_key.objectid != tmp->bytenr ||
- found_key.type != BTRFS_EXTENT_REF_KEY ||
- found_key.offset != tmp->orig_parent)
- break;
-
- /*
- * the ref is right next to the extent, we can set the
- * ref count to 0 since we will delete them both now
- */
- btrfs_set_extent_refs(leaf, ei, 0);
-
- /* pin down the bytes for this extent */
- mutex_lock(&info->pinned_mutex);
- ret = pin_down_bytes(trans, extent_root, tmp->bytenr,
- tmp->num_bytes, tmp->level >=
- BTRFS_FIRST_FREE_OBJECTID);
- mutex_unlock(&info->pinned_mutex);
- BUG_ON(ret < 0);
-
- /*
- * use the del field to tell if we need to go ahead and
- * free up the extent when we delete the item or not.
- */
- tmp->del = ret;
- bytes_freed += tmp->num_bytes;
-
- num_to_del += 2;
- cur_slot += 2;
- }
- end = pos;
-
- /* update the free space counters */
- spin_lock(&info->delalloc_lock);
- super_used = btrfs_super_bytes_used(&info->super_copy);
- btrfs_set_super_bytes_used(&info->super_copy,
- super_used - bytes_freed);
-
- root_used = btrfs_root_used(&extent_root->root_item);
- btrfs_set_root_used(&extent_root->root_item,
- root_used - bytes_freed);
- spin_unlock(&info->delalloc_lock);
-
- /* delete the items */
- ret = btrfs_del_items(trans, extent_root, path,
- path->slots[0], num_to_del);
- BUG_ON(ret);
-
- /*
- * loop through the extents we deleted and do the cleanup work
- * on them
- */
- for (pos = cur, n = pos->next; pos != end;
- pos = n, n = pos->next) {
- struct pending_extent_op *tmp;
- tmp = list_entry(pos, struct pending_extent_op, list);
-
- /*
- * remember tmp->del tells us wether or not we pinned
- * down the extent
- */
- ret = update_block_group(trans, extent_root,
- tmp->bytenr, tmp->num_bytes, 0,
- tmp->del);
- BUG_ON(ret);
-
- list_del_init(&tmp->list);
- unlock_extent(&info->extent_ins, tmp->bytenr,
- tmp->bytenr + tmp->num_bytes - 1,
- GFP_NOFS);
- kfree(tmp);
- }
- } else if (refs && found_extent) {
- /*
- * the ref and extent were right next to eachother, but the
- * extent still has a ref, so just free the backref and keep
- * going
- */
- ret = remove_extent_backref(trans, extent_root, path);
- BUG_ON(ret);
-
- list_del_init(&op->list);
- unlock_extent(&info->extent_ins, op->bytenr,
- op->bytenr + op->num_bytes - 1, GFP_NOFS);
- kfree(op);
- } else {
- /*
- * the extent has multiple refs and the backref we were looking
- * for was not right next to it, so just unlock and go next,
- * we're good to go
- */
- list_del_init(&op->list);
- unlock_extent(&info->extent_ins, op->bytenr,
- op->bytenr + op->num_bytes - 1, GFP_NOFS);
- kfree(op);
- }
-
- btrfs_release_path(extent_root, path);
- if (!list_empty(del_list))
- goto search;
-
-out:
- btrfs_free_path(path);
- return ret;
-}
-
static int __btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 bytenr,
+ u64 num_bytes,
u64 orig_parent, u64 parent,
u64 orig_root, u64 ref_root,
u64 orig_generation, u64 ref_generation,
u64 owner_objectid)
{
int ret;
- struct btrfs_root *extent_root = root->fs_info->extent_root;
- struct btrfs_path *path;
+ int pin = owner_objectid < BTRFS_FIRST_FREE_OBJECTID;
- if (root == root->fs_info->extent_root) {
- struct pending_extent_op *extent_op;
- u64 num_bytes;
-
- BUG_ON(owner_objectid >= BTRFS_MAX_LEVEL);
- num_bytes = btrfs_level_size(root, (int)owner_objectid);
- mutex_lock(&root->fs_info->extent_ins_mutex);
- if (test_range_bit(&root->fs_info->extent_ins, bytenr,
- bytenr + num_bytes - 1, EXTENT_WRITEBACK, 0)) {
- u64 priv;
- ret = get_state_private(&root->fs_info->extent_ins,
- bytenr, &priv);
- BUG_ON(ret);
- extent_op = (struct pending_extent_op *)
- (unsigned long)priv;
- BUG_ON(extent_op->parent != orig_parent);
- BUG_ON(extent_op->generation != orig_generation);
-
- extent_op->parent = parent;
- extent_op->generation = ref_generation;
- } else {
- extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS);
- BUG_ON(!extent_op);
-
- extent_op->type = PENDING_BACKREF_UPDATE;
- extent_op->bytenr = bytenr;
- extent_op->num_bytes = num_bytes;
- extent_op->parent = parent;
- extent_op->orig_parent = orig_parent;
- extent_op->generation = ref_generation;
- extent_op->orig_generation = orig_generation;
- extent_op->level = (int)owner_objectid;
- INIT_LIST_HEAD(&extent_op->list);
- extent_op->del = 0;
-
- set_extent_bits(&root->fs_info->extent_ins,
- bytenr, bytenr + num_bytes - 1,
- EXTENT_WRITEBACK, GFP_NOFS);
- set_state_private(&root->fs_info->extent_ins,
- bytenr, (unsigned long)extent_op);
- }
- mutex_unlock(&root->fs_info->extent_ins_mutex);
- return 0;
- }
-
- path = btrfs_alloc_path();
- if (!path)
- return -ENOMEM;
- ret = lookup_extent_backref(trans, extent_root, path,
- bytenr, orig_parent, orig_root,
- orig_generation, owner_objectid, 1);
- if (ret)
- goto out;
- ret = remove_extent_backref(trans, extent_root, path);
- if (ret)
- goto out;
- ret = insert_extent_backref(trans, extent_root, path, bytenr,
- parent, ref_root, ref_generation,
- owner_objectid);
+ ret = btrfs_update_delayed_ref(trans, bytenr, num_bytes,
+ orig_parent, parent, orig_root,
+ ref_root, orig_generation,
+ ref_generation, owner_objectid, pin);
BUG_ON(ret);
- finish_current_insert(trans, extent_root, 0);
- del_pending_extents(trans, extent_root, 0);
-out:
- btrfs_free_path(path);
return ret;
}
int btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 bytenr,
- u64 orig_parent, u64 parent,
+ u64 num_bytes, u64 orig_parent, u64 parent,
u64 ref_root, u64 ref_generation,
u64 owner_objectid)
{
if (ref_root == BTRFS_TREE_LOG_OBJECTID &&
owner_objectid < BTRFS_FIRST_FREE_OBJECTID)
return 0;
- ret = __btrfs_update_extent_ref(trans, root, bytenr, orig_parent,
- parent, ref_root, ref_root,
- ref_generation, ref_generation,
- owner_objectid);
+
+ ret = __btrfs_update_extent_ref(trans, root, bytenr, num_bytes,
+ orig_parent, parent, ref_root,
+ ref_root, ref_generation,
+ ref_generation, owner_objectid);
return ret;
}
-
static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 bytenr,
+ u64 num_bytes,
u64 orig_parent, u64 parent,
u64 orig_root, u64 ref_root,
u64 orig_generation, u64 ref_generation,
u64 owner_objectid)
+{
+ int ret;
+
+ ret = btrfs_add_delayed_ref(trans, bytenr, num_bytes, parent, ref_root,
+ ref_generation, owner_objectid,
+ BTRFS_ADD_DELAYED_REF, 0);
+ BUG_ON(ret);
+ return ret;
+}
+
+static noinline_for_stack int add_extent_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 bytenr,
+ u64 num_bytes, u64 parent, u64 ref_root,
+ u64 ref_generation, u64 owner_objectid,
+ int refs_to_add)
{
struct btrfs_path *path;
int ret;
return -ENOMEM;
path->reada = 1;
+ path->leave_spinning = 1;
key.objectid = bytenr;
key.type = BTRFS_EXTENT_ITEM_KEY;
- key.offset = (u64)-1;
+ key.offset = num_bytes;
- ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path,
- 0, 1);
- if (ret < 0)
+ /* first find the extent item and update its reference count */
+ ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key,
+ path, 0, 1);
+ if (ret < 0) {
+ btrfs_set_path_blocking(path);
return ret;
- BUG_ON(ret == 0 || path->slots[0] == 0);
+ }
- path->slots[0]--;
+ if (ret > 0) {
+ WARN_ON(1);
+ btrfs_free_path(path);
+ return -EIO;
+ }
l = path->nodes[0];
btrfs_item_key_to_cpu(l, &key, path->slots[0]);
BUG_ON(key.type != BTRFS_EXTENT_ITEM_KEY);
item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item);
+
refs = btrfs_extent_refs(l, item);
- btrfs_set_extent_refs(l, item, refs + 1);
+ btrfs_set_extent_refs(l, item, refs + refs_to_add);
+ btrfs_unlock_up_safe(path, 1);
+
btrfs_mark_buffer_dirty(path->nodes[0]);
btrfs_release_path(root->fs_info->extent_root, path);
path->reada = 1;
+ path->leave_spinning = 1;
+
+ /* now insert the actual backref */
ret = insert_extent_backref(trans, root->fs_info->extent_root,
path, bytenr, parent,
ref_root, ref_generation,
- owner_objectid);
+ owner_objectid, refs_to_add);
BUG_ON(ret);
- finish_current_insert(trans, root->fs_info->extent_root, 0);
- del_pending_extents(trans, root->fs_info->extent_root, 0);
-
btrfs_free_path(path);
return 0;
}
if (ref_root == BTRFS_TREE_LOG_OBJECTID &&
owner_objectid < BTRFS_FIRST_FREE_OBJECTID)
return 0;
- ret = __btrfs_inc_extent_ref(trans, root, bytenr, 0, parent,
+
+ ret = __btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, 0, parent,
0, ref_root, 0, ref_generation,
owner_objectid);
return ret;
}
-int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
- struct btrfs_root *root)
+static int drop_delayed_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_delayed_ref_node *node)
{
- finish_current_insert(trans, root->fs_info->extent_root, 1);
- del_pending_extents(trans, root->fs_info->extent_root, 1);
+ int ret = 0;
+ struct btrfs_delayed_ref *ref = btrfs_delayed_node_to_ref(node);
+
+ BUG_ON(node->ref_mod == 0);
+ ret = __btrfs_free_extent(trans, root, node->bytenr, node->num_bytes,
+ node->parent, ref->root, ref->generation,
+ ref->owner_objectid, ref->pin, node->ref_mod);
+
+ return ret;
+}
+
+/* helper function to actually process a single delayed ref entry */
+static noinline int run_one_delayed_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_delayed_ref_node *node,
+ int insert_reserved)
+{
+ int ret;
+ struct btrfs_delayed_ref *ref;
+
+ if (node->parent == (u64)-1) {
+ struct btrfs_delayed_ref_head *head;
+ /*
+ * we've hit the end of the chain and we were supposed
+ * to insert this extent into the tree. But, it got
+ * deleted before we ever needed to insert it, so all
+ * we have to do is clean up the accounting
+ */
+ if (insert_reserved) {
+ update_reserved_extents(root, node->bytenr,
+ node->num_bytes, 0);
+ }
+ head = btrfs_delayed_node_to_head(node);
+ mutex_unlock(&head->mutex);
+ return 0;
+ }
+
+ ref = btrfs_delayed_node_to_ref(node);
+ if (ref->action == BTRFS_ADD_DELAYED_REF) {
+ if (insert_reserved) {
+ struct btrfs_key ins;
+
+ ins.objectid = node->bytenr;
+ ins.offset = node->num_bytes;
+ ins.type = BTRFS_EXTENT_ITEM_KEY;
+
+ /* record the full extent allocation */
+ ret = __btrfs_alloc_reserved_extent(trans, root,
+ node->parent, ref->root,
+ ref->generation, ref->owner_objectid,
+ &ins, node->ref_mod);
+ update_reserved_extents(root, node->bytenr,
+ node->num_bytes, 0);
+ } else {
+ /* just add one backref */
+ ret = add_extent_ref(trans, root, node->bytenr,
+ node->num_bytes,
+ node->parent, ref->root, ref->generation,
+ ref->owner_objectid, node->ref_mod);
+ }
+ BUG_ON(ret);
+ } else if (ref->action == BTRFS_DROP_DELAYED_REF) {
+ WARN_ON(insert_reserved);
+ ret = drop_delayed_ref(trans, root, node);
+ }
return 0;
}
-int btrfs_lookup_extent_ref(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, u64 bytenr,
- u64 num_bytes, u32 *refs)
+static noinline struct btrfs_delayed_ref_node *
+select_delayed_ref(struct btrfs_delayed_ref_head *head)
{
- struct btrfs_path *path;
+ struct rb_node *node;
+ struct btrfs_delayed_ref_node *ref;
+ int action = BTRFS_ADD_DELAYED_REF;
+again:
+ /*
+ * select delayed ref of type BTRFS_ADD_DELAYED_REF first.
+ * this prevents ref count from going down to zero when
+ * there still are pending delayed ref.
+ */
+ node = rb_prev(&head->node.rb_node);
+ while (1) {
+ if (!node)
+ break;
+ ref = rb_entry(node, struct btrfs_delayed_ref_node,
+ rb_node);
+ if (ref->bytenr != head->node.bytenr)
+ break;
+ if (btrfs_delayed_node_to_ref(ref)->action == action)
+ return ref;
+ node = rb_prev(node);
+ }
+ if (action == BTRFS_ADD_DELAYED_REF) {
+ action = BTRFS_DROP_DELAYED_REF;
+ goto again;
+ }
+ return NULL;
+}
+
+static noinline int run_clustered_refs(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct list_head *cluster)
+{
+ struct btrfs_delayed_ref_root *delayed_refs;
+ struct btrfs_delayed_ref_node *ref;
+ struct btrfs_delayed_ref_head *locked_ref = NULL;
int ret;
- struct btrfs_key key;
- struct extent_buffer *l;
- struct btrfs_extent_item *item;
+ int count = 0;
+ int must_insert_reserved = 0;
- 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);
- ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path,
- 0, 0);
- if (ret < 0)
- goto out;
- if (ret != 0) {
- btrfs_print_leaf(root, path->nodes[0]);
- printk(KERN_INFO "btrfs failed to find block number %llu\n",
- (unsigned long long)bytenr);
- BUG();
+ delayed_refs = &trans->transaction->delayed_refs;
+ while (1) {
+ if (!locked_ref) {
+ /* pick a new head ref from the cluster list */
+ if (list_empty(cluster))
+ break;
+
+ locked_ref = list_entry(cluster->next,
+ struct btrfs_delayed_ref_head, cluster);
+
+ /* grab the lock that says we are going to process
+ * all the refs for this head */
+ ret = btrfs_delayed_ref_lock(trans, locked_ref);
+
+ /*
+ * we may have dropped the spin lock to get the head
+ * mutex lock, and that might have given someone else
+ * time to free the head. If that's true, it has been
+ * removed from our list and we can move on.
+ */
+ if (ret == -EAGAIN) {
+ locked_ref = NULL;
+ count++;
+ continue;
+ }
+ }
+
+ /*
+ * record the must insert reserved flag before we
+ * drop the spin lock.
+ */
+ must_insert_reserved = locked_ref->must_insert_reserved;
+ locked_ref->must_insert_reserved = 0;
+
+ /*
+ * locked_ref is the head node, so we have to go one
+ * node back for any delayed ref updates
+ */
+ ref = select_delayed_ref(locked_ref);
+ if (!ref) {
+ /* All delayed refs have been processed, Go ahead
+ * and send the head node to run_one_delayed_ref,
+ * so that any accounting fixes can happen
+ */
+ ref = &locked_ref->node;
+ list_del_init(&locked_ref->cluster);
+ locked_ref = NULL;
+ }
+
+ ref->in_tree = 0;
+ rb_erase(&ref->rb_node, &delayed_refs->root);
+ delayed_refs->num_entries--;
+ spin_unlock(&delayed_refs->lock);
+
+ ret = run_one_delayed_ref(trans, root, ref,
+ must_insert_reserved);
+ BUG_ON(ret);
+ btrfs_put_delayed_ref(ref);
+
+ count++;
+ cond_resched();
+ spin_lock(&delayed_refs->lock);
+ }
+ return count;
+}
+
+/*
+ * this starts processing the delayed reference count updates and
+ * extent insertions we have queued up so far. count can be
+ * 0, which means to process everything in the tree at the start
+ * of the run (but not newly added entries), or it can be some target
+ * number you'd like to process.
+ */
+int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, unsigned long count)
+{
+ struct rb_node *node;
+ struct btrfs_delayed_ref_root *delayed_refs;
+ struct btrfs_delayed_ref_node *ref;
+ struct list_head cluster;
+ int ret;
+ int run_all = count == (unsigned long)-1;
+ int run_most = 0;
+
+ if (root == root->fs_info->extent_root)
+ root = root->fs_info->tree_root;
+
+ delayed_refs = &trans->transaction->delayed_refs;
+ INIT_LIST_HEAD(&cluster);
+again:
+ spin_lock(&delayed_refs->lock);
+ if (count == 0) {
+ count = delayed_refs->num_entries * 2;
+ run_most = 1;
+ }
+ while (1) {
+ if (!(run_all || run_most) &&
+ delayed_refs->num_heads_ready < 64)
+ break;
+
+ /*
+ * go find something we can process in the rbtree. We start at
+ * the beginning of the tree, and then build a cluster
+ * of refs to process starting at the first one we are able to
+ * lock
+ */
+ ret = btrfs_find_ref_cluster(trans, &cluster,
+ delayed_refs->run_delayed_start);
+ if (ret)
+ break;
+
+ ret = run_clustered_refs(trans, root, &cluster);
+ BUG_ON(ret < 0);
+
+ count -= min_t(unsigned long, ret, count);
+
+ if (count == 0)
+ break;
+ }
+
+ if (run_all) {
+ node = rb_first(&delayed_refs->root);
+ if (!node)
+ goto out;
+ count = (unsigned long)-1;
+
+ while (node) {
+ ref = rb_entry(node, struct btrfs_delayed_ref_node,
+ rb_node);
+ if (btrfs_delayed_ref_is_head(ref)) {
+ struct btrfs_delayed_ref_head *head;
+
+ head = btrfs_delayed_node_to_head(ref);
+ atomic_inc(&ref->refs);
+
+ spin_unlock(&delayed_refs->lock);
+ mutex_lock(&head->mutex);
+ mutex_unlock(&head->mutex);
+
+ btrfs_put_delayed_ref(ref);
+ cond_resched();
+ goto again;
+ }
+ node = rb_next(node);
+ }
+ spin_unlock(&delayed_refs->lock);
+ schedule_timeout(1);
+ goto again;
}
- l = path->nodes[0];
- item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item);
- *refs = btrfs_extent_refs(l, item);
out:
- btrfs_free_path(path);
+ spin_unlock(&delayed_refs->lock);
return 0;
}
return ret;
}
-int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
- struct extent_buffer *orig_buf, struct extent_buffer *buf,
- u32 *nr_extents)
+/* when a block goes through cow, we update the reference counts of
+ * everything that block points to. The internal pointers of the block
+ * can be in just about any order, and it is likely to have clusters of
+ * things that are close together and clusters of things that are not.
+ *
+ * To help reduce the seeks that come with updating all of these reference
+ * counts, sort them by byte number before actual updates are done.
+ *
+ * struct refsort is used to match byte number to slot in the btree block.
+ * we sort based on the byte number and then use the slot to actually
+ * find the item.
+ *
+ * struct refsort is smaller than strcut btrfs_item and smaller than
+ * struct btrfs_key_ptr. Since we're currently limited to the page size
+ * for a btree block, there's no way for a kmalloc of refsorts for a
+ * single node to be bigger than a page.
+ */
+struct refsort {
+ u64 bytenr;
+ u32 slot;
+};
+
+/*
+ * for passing into sort()
+ */
+static int refsort_cmp(const void *a_void, const void *b_void)
+{
+ const struct refsort *a = a_void;
+ const struct refsort *b = b_void;
+
+ if (a->bytenr < b->bytenr)
+ return -1;
+ if (a->bytenr > b->bytenr)
+ return 1;
+ return 0;
+}
+
+
+noinline int btrfs_inc_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_buffer *orig_buf,
+ struct extent_buffer *buf, u32 *nr_extents)
{
u64 bytenr;
u64 ref_root;
u64 orig_root;
u64 ref_generation;
u64 orig_generation;
+ struct refsort *sorted;
u32 nritems;
u32 nr_file_extents = 0;
struct btrfs_key key;
int level;
int ret = 0;
int faili = 0;
+ int refi = 0;
+ int slot;
int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *,
- u64, u64, u64, u64, u64, u64, u64, u64);
+ u64, u64, u64, u64, u64, u64, u64, u64, u64);
ref_root = btrfs_header_owner(buf);
ref_generation = btrfs_header_generation(buf);
nritems = btrfs_header_nritems(buf);
level = btrfs_header_level(buf);
+ sorted = kmalloc(sizeof(struct refsort) * nritems, GFP_NOFS);
+ BUG_ON(!sorted);
+
if (root->ref_cows) {
process_func = __btrfs_inc_extent_ref;
} else {
process_func = __btrfs_update_extent_ref;
}
- for (i = 0; i < nritems; i++) {
+ /*
+ * we make two passes through the items. In the first pass we
+ * only record the byte number and slot. Then we sort based on
+ * byte number and do the actual work based on the sorted results
+ */
+ for (i = 0; i < nritems; i++) {
+ cond_resched();
+ if (level == 0) {
+ btrfs_item_key_to_cpu(buf, &key, i);
+ if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
+ continue;
+ fi = btrfs_item_ptr(buf, i,
+ struct btrfs_file_extent_item);
+ if (btrfs_file_extent_type(buf, fi) ==
+ BTRFS_FILE_EXTENT_INLINE)
+ continue;
+ bytenr = btrfs_file_extent_disk_bytenr(buf, fi);
+ if (bytenr == 0)
+ continue;
+
+ nr_file_extents++;
+ sorted[refi].bytenr = bytenr;
+ sorted[refi].slot = i;
+ refi++;
+ } else {
+ bytenr = btrfs_node_blockptr(buf, i);
+ sorted[refi].bytenr = bytenr;
+ sorted[refi].slot = i;
+ refi++;
+ }
+ }
+ /*
+ * if refi == 0, we didn't actually put anything into the sorted
+ * array and we're done
+ */
+ if (refi == 0)
+ goto out;
+
+ sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL);
+
+ for (i = 0; i < refi; i++) {
cond_resched();
+ slot = sorted[i].slot;
+ bytenr = sorted[i].bytenr;
+
if (level == 0) {
- btrfs_item_key_to_cpu(buf, &key, i);
- if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
- continue;
- fi = btrfs_item_ptr(buf, i,
+ btrfs_item_key_to_cpu(buf, &key, slot);
+ fi = btrfs_item_ptr(buf, slot,
struct btrfs_file_extent_item);
- if (btrfs_file_extent_type(buf, fi) ==
- BTRFS_FILE_EXTENT_INLINE)
- continue;
+
bytenr = btrfs_file_extent_disk_bytenr(buf, fi);
if (bytenr == 0)
continue;
- nr_file_extents++;
-
ret = process_func(trans, root, bytenr,
- orig_buf->start, buf->start,
- orig_root, ref_root,
- orig_generation, ref_generation,
- key.objectid);
+ btrfs_file_extent_disk_num_bytes(buf, fi),
+ orig_buf->start, buf->start,
+ orig_root, ref_root,
+ orig_generation, ref_generation,
+ key.objectid);
if (ret) {
- faili = i;
+ faili = slot;
WARN_ON(1);
goto fail;
}
} else {
- bytenr = btrfs_node_blockptr(buf, i);
- ret = process_func(trans, root, bytenr,
+ ret = process_func(trans, root, bytenr, buf->len,
orig_buf->start, buf->start,
orig_root, ref_root,
orig_generation, ref_generation,
level - 1);
if (ret) {
- faili = i;
+ faili = slot;
WARN_ON(1);
goto fail;
}
}
}
out:
+ kfree(sorted);
if (nr_extents) {
if (level == 0)
*nr_extents = nr_file_extents;
}
return 0;
fail:
+ kfree(sorted);
WARN_ON(1);
return ret;
}
if (bytenr == 0)
continue;
ret = __btrfs_update_extent_ref(trans, root, bytenr,
- orig_buf->start, buf->start,
- orig_root, ref_root,
- orig_generation, ref_generation,
- key.objectid);
+ btrfs_file_extent_disk_num_bytes(buf, fi),
+ orig_buf->start, buf->start,
+ orig_root, ref_root, orig_generation,
+ ref_generation, key.objectid);
if (ret)
goto fail;
} else {
bytenr = btrfs_node_blockptr(buf, slot);
ret = __btrfs_update_extent_ref(trans, root, bytenr,
- orig_buf->start, buf->start,
- orig_root, ref_root,
+ buf->len, orig_buf->start,
+ buf->start, orig_root, ref_root,
orig_generation, ref_generation,
level - 1);
if (ret)
struct btrfs_block_group_cache *cache)
{
int ret;
- int pending_ret;
struct btrfs_root *extent_root = root->fs_info->extent_root;
unsigned long bi;
struct extent_buffer *leaf;
btrfs_mark_buffer_dirty(leaf);
btrfs_release_path(extent_root, path);
fail:
- finish_current_insert(trans, extent_root, 0);
- pending_ret = del_pending_extents(trans, extent_root, 0);
if (ret)
return ret;
- if (pending_ret)
- return pending_ret;
return 0;
}
if (!found)
return -ENOMEM;
- list_add(&found->list, &info->space_info);
INIT_LIST_HEAD(&found->block_groups);
init_rwsem(&found->groups_sem);
spin_lock_init(&found->lock);
found->bytes_pinned = 0;
found->bytes_reserved = 0;
found->bytes_readonly = 0;
+ found->bytes_delalloc = 0;
found->full = 0;
found->force_alloc = 0;
*space_info = found;
+ list_add_rcu(&found->list, &info->space_info);
return 0;
}
return flags;
}
+static u64 btrfs_get_alloc_profile(struct btrfs_root *root, u64 data)
+{
+ struct btrfs_fs_info *info = root->fs_info;
+ u64 alloc_profile;
+
+ 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;
+ }
+
+ return btrfs_reduce_alloc_profile(root, data);
+}
+
+void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *inode)
+{
+ u64 alloc_target;
+
+ alloc_target = btrfs_get_alloc_profile(root, 1);
+ BTRFS_I(inode)->space_info = __find_space_info(root->fs_info,
+ alloc_target);
+}
+
+/*
+ * for now this just makes sure we have at least 5% of our metadata space free
+ * for use.
+ */
+int btrfs_check_metadata_free_space(struct btrfs_root *root)
+{
+ struct btrfs_fs_info *info = root->fs_info;
+ struct btrfs_space_info *meta_sinfo;
+ u64 alloc_target, thresh;
+ int committed = 0, ret;
+
+ /* get the space info for where the metadata will live */
+ alloc_target = btrfs_get_alloc_profile(root, 0);
+ meta_sinfo = __find_space_info(info, alloc_target);
+
+again:
+ spin_lock(&meta_sinfo->lock);
+ if (!meta_sinfo->full)
+ thresh = meta_sinfo->total_bytes * 80;
+ else
+ thresh = meta_sinfo->total_bytes * 95;
+
+ do_div(thresh, 100);
+
+ if (meta_sinfo->bytes_used + meta_sinfo->bytes_reserved +
+ meta_sinfo->bytes_pinned + meta_sinfo->bytes_readonly > thresh) {
+ struct btrfs_trans_handle *trans;
+ if (!meta_sinfo->full) {
+ meta_sinfo->force_alloc = 1;
+ spin_unlock(&meta_sinfo->lock);
+
+ trans = btrfs_start_transaction(root, 1);
+ if (!trans)
+ return -ENOMEM;
+
+ ret = do_chunk_alloc(trans, root->fs_info->extent_root,
+ 2 * 1024 * 1024, alloc_target, 0);
+ btrfs_end_transaction(trans, root);
+ goto again;
+ }
+ spin_unlock(&meta_sinfo->lock);
+
+ if (!committed) {
+ committed = 1;
+ trans = btrfs_join_transaction(root, 1);
+ if (!trans)
+ return -ENOMEM;
+ ret = btrfs_commit_transaction(trans, root);
+ if (ret)
+ return ret;
+ goto again;
+ }
+ return -ENOSPC;
+ }
+ spin_unlock(&meta_sinfo->lock);
+
+ return 0;
+}
+
+/*
+ * This will check the space that the inode allocates from to make sure we have
+ * enough space for bytes.
+ */
+int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode,
+ u64 bytes)
+{
+ struct btrfs_space_info *data_sinfo;
+ int ret = 0, committed = 0;
+
+ /* make sure bytes are sectorsize aligned */
+ bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1);
+
+ data_sinfo = BTRFS_I(inode)->space_info;
+again:
+ /* make sure we have enough space to handle the data first */
+ spin_lock(&data_sinfo->lock);
+ if (data_sinfo->total_bytes - data_sinfo->bytes_used -
+ data_sinfo->bytes_delalloc - data_sinfo->bytes_reserved -
+ data_sinfo->bytes_pinned - data_sinfo->bytes_readonly -
+ data_sinfo->bytes_may_use < bytes) {
+ struct btrfs_trans_handle *trans;
+
+ /*
+ * if we don't have enough free bytes in this space then we need
+ * to alloc a new chunk.
+ */
+ if (!data_sinfo->full) {
+ u64 alloc_target;
+
+ data_sinfo->force_alloc = 1;
+ spin_unlock(&data_sinfo->lock);
+
+ alloc_target = btrfs_get_alloc_profile(root, 1);
+ trans = btrfs_start_transaction(root, 1);
+ if (!trans)
+ return -ENOMEM;
+
+ ret = do_chunk_alloc(trans, root->fs_info->extent_root,
+ bytes + 2 * 1024 * 1024,
+ alloc_target, 0);
+ btrfs_end_transaction(trans, root);
+ if (ret)
+ return ret;
+ goto again;
+ }
+ spin_unlock(&data_sinfo->lock);
+
+ /* commit the current transaction and try again */
+ if (!committed) {
+ committed = 1;
+ trans = btrfs_join_transaction(root, 1);
+ if (!trans)
+ return -ENOMEM;
+ ret = btrfs_commit_transaction(trans, root);
+ if (ret)
+ return ret;
+ goto again;
+ }
+
+ 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);
+ return -ENOSPC;
+ }
+ data_sinfo->bytes_may_use += bytes;
+ BTRFS_I(inode)->reserved_bytes += bytes;
+ spin_unlock(&data_sinfo->lock);
+
+ return btrfs_check_metadata_free_space(root);
+}
+
+/*
+ * if there was an error for whatever reason after calling
+ * btrfs_check_data_free_space, call this so we can cleanup the counters.
+ */
+void btrfs_free_reserved_data_space(struct btrfs_root *root,
+ struct inode *inode, u64 bytes)
+{
+ struct btrfs_space_info *data_sinfo;
+
+ /* make sure bytes are sectorsize aligned */
+ bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1);
+
+ data_sinfo = BTRFS_I(inode)->space_info;
+ spin_lock(&data_sinfo->lock);
+ data_sinfo->bytes_may_use -= bytes;
+ BTRFS_I(inode)->reserved_bytes -= bytes;
+ spin_unlock(&data_sinfo->lock);
+}
+
+/* called when we are adding a delalloc extent to the inode's io_tree */
+void btrfs_delalloc_reserve_space(struct btrfs_root *root, struct inode *inode,
+ u64 bytes)
+{
+ struct btrfs_space_info *data_sinfo;
+
+ /* get the space info for where this inode will be storing its data */
+ data_sinfo = BTRFS_I(inode)->space_info;
+
+ /* make sure we have enough space to handle the data first */
+ spin_lock(&data_sinfo->lock);
+ data_sinfo->bytes_delalloc += bytes;
+
+ /*
+ * we are adding a delalloc extent without calling
+ * btrfs_check_data_free_space first. This happens on a weird
+ * writepage condition, but shouldn't hurt our accounting
+ */
+ if (unlikely(bytes > BTRFS_I(inode)->reserved_bytes)) {
+ data_sinfo->bytes_may_use -= BTRFS_I(inode)->reserved_bytes;
+ BTRFS_I(inode)->reserved_bytes = 0;
+ } else {
+ data_sinfo->bytes_may_use -= bytes;
+ BTRFS_I(inode)->reserved_bytes -= bytes;
+ }
+
+ spin_unlock(&data_sinfo->lock);
+}
+
+/* called when we are clearing an delalloc extent from the inode's io_tree */
+void btrfs_delalloc_free_space(struct btrfs_root *root, struct inode *inode,
+ u64 bytes)
+{
+ struct btrfs_space_info *info;
+
+ info = BTRFS_I(inode)->space_info;
+
+ spin_lock(&info->lock);
+ info->bytes_delalloc -= bytes;
+ spin_unlock(&info->lock);
+}
+
static int do_chunk_alloc(struct btrfs_trans_handle *trans,
struct btrfs_root *extent_root, u64 alloc_bytes,
u64 flags, int force)
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);
BUG_ON(!cache);
u64 end;
int ret;
- mutex_lock(&root->fs_info->pinned_mutex);
while (1) {
+ mutex_lock(&root->fs_info->pinned_mutex);
ret = find_first_extent_bit(unpin, 0, &start, &end,
EXTENT_DIRTY);
if (ret)
ret = btrfs_discard_extent(root, start, end + 1 - start);
+ /* unlocks the pinned mutex */
btrfs_update_pinned_extents(root, start, end + 1 - start, 0);
clear_extent_dirty(unpin, start, end, GFP_NOFS);
- if (need_resched()) {
- mutex_unlock(&root->fs_info->pinned_mutex);
- cond_resched();
- mutex_lock(&root->fs_info->pinned_mutex);
- }
+ cond_resched();
}
mutex_unlock(&root->fs_info->pinned_mutex);
return ret;
}
-static int finish_current_insert(struct btrfs_trans_handle *trans,
- struct btrfs_root *extent_root, int all)
-{
- u64 start;
- u64 end;
- u64 priv;
- u64 search = 0;
- u64 skipped = 0;
- struct btrfs_fs_info *info = extent_root->fs_info;
- struct btrfs_path *path;
- struct pending_extent_op *extent_op, *tmp;
- struct list_head insert_list, update_list;
- int ret;
- int num_inserts = 0, max_inserts;
-
- path = btrfs_alloc_path();
- INIT_LIST_HEAD(&insert_list);
- INIT_LIST_HEAD(&update_list);
-
- max_inserts = extent_root->leafsize /
- (2 * sizeof(struct btrfs_key) + 2 * sizeof(struct btrfs_item) +
- sizeof(struct btrfs_extent_ref) +
- sizeof(struct btrfs_extent_item));
-again:
- mutex_lock(&info->extent_ins_mutex);
- while (1) {
- ret = find_first_extent_bit(&info->extent_ins, search, &start,
- &end, EXTENT_WRITEBACK);
- if (ret) {
- if (skipped && all && !num_inserts) {
- skipped = 0;
- search = 0;
- continue;
- }
- mutex_unlock(&info->extent_ins_mutex);
- break;
- }
-
- ret = try_lock_extent(&info->extent_ins, start, end, GFP_NOFS);
- if (!ret) {
- skipped = 1;
- search = end + 1;
- if (need_resched()) {
- mutex_unlock(&info->extent_ins_mutex);
- cond_resched();
- mutex_lock(&info->extent_ins_mutex);
- }
- continue;
- }
-
- ret = get_state_private(&info->extent_ins, start, &priv);
- BUG_ON(ret);
- extent_op = (struct pending_extent_op *)(unsigned long) priv;
-
- if (extent_op->type == PENDING_EXTENT_INSERT) {
- num_inserts++;
- list_add_tail(&extent_op->list, &insert_list);
- search = end + 1;
- if (num_inserts == max_inserts) {
- mutex_unlock(&info->extent_ins_mutex);
- break;
- }
- } else if (extent_op->type == PENDING_BACKREF_UPDATE) {
- list_add_tail(&extent_op->list, &update_list);
- search = end + 1;
- } else {
- BUG();
- }
- }
-
- /*
- * process the update list, clear the writeback bit for it, and if
- * somebody marked this thing for deletion then just unlock it and be
- * done, the free_extents will handle it
- */
- mutex_lock(&info->extent_ins_mutex);
- list_for_each_entry_safe(extent_op, tmp, &update_list, list) {
- clear_extent_bits(&info->extent_ins, extent_op->bytenr,
- extent_op->bytenr + extent_op->num_bytes - 1,
- EXTENT_WRITEBACK, GFP_NOFS);
- if (extent_op->del) {
- list_del_init(&extent_op->list);
- unlock_extent(&info->extent_ins, extent_op->bytenr,
- extent_op->bytenr + extent_op->num_bytes
- - 1, GFP_NOFS);
- kfree(extent_op);
- }
- }
- mutex_unlock(&info->extent_ins_mutex);
-
- /*
- * still have things left on the update list, go ahead an update
- * everything
- */
- if (!list_empty(&update_list)) {
- ret = update_backrefs(trans, extent_root, path, &update_list);
- BUG_ON(ret);
- }
-
- /*
- * if no inserts need to be done, but we skipped some extents and we
- * need to make sure everything is cleaned then reset everything and
- * go back to the beginning
- */
- if (!num_inserts && all && skipped) {
- search = 0;
- skipped = 0;
- INIT_LIST_HEAD(&update_list);
- INIT_LIST_HEAD(&insert_list);
- goto again;
- } else if (!num_inserts) {
- goto out;
- }
-
- /*
- * process the insert extents list. Again if we are deleting this
- * extent, then just unlock it, pin down the bytes if need be, and be
- * done with it. Saves us from having to actually insert the extent
- * into the tree and then subsequently come along and delete it
- */
- mutex_lock(&info->extent_ins_mutex);
- list_for_each_entry_safe(extent_op, tmp, &insert_list, list) {
- clear_extent_bits(&info->extent_ins, extent_op->bytenr,
- extent_op->bytenr + extent_op->num_bytes - 1,
- EXTENT_WRITEBACK, GFP_NOFS);
- if (extent_op->del) {
- u64 used;
- list_del_init(&extent_op->list);
- unlock_extent(&info->extent_ins, extent_op->bytenr,
- extent_op->bytenr + extent_op->num_bytes
- - 1, GFP_NOFS);
-
- mutex_lock(&extent_root->fs_info->pinned_mutex);
- ret = pin_down_bytes(trans, extent_root,
- extent_op->bytenr,
- extent_op->num_bytes, 0);
- mutex_unlock(&extent_root->fs_info->pinned_mutex);
-
- spin_lock(&info->delalloc_lock);
- used = btrfs_super_bytes_used(&info->super_copy);
- btrfs_set_super_bytes_used(&info->super_copy,
- used - extent_op->num_bytes);
- used = btrfs_root_used(&extent_root->root_item);
- btrfs_set_root_used(&extent_root->root_item,
- used - extent_op->num_bytes);
- spin_unlock(&info->delalloc_lock);
-
- ret = update_block_group(trans, extent_root,
- extent_op->bytenr,
- extent_op->num_bytes,
- 0, ret > 0);
- BUG_ON(ret);
- kfree(extent_op);
- num_inserts--;
- }
- }
- mutex_unlock(&info->extent_ins_mutex);
-
- ret = insert_extents(trans, extent_root, path, &insert_list,
- num_inserts);
- BUG_ON(ret);
-
- /*
- * if we broke out of the loop in order to insert stuff because we hit
- * the maximum number of inserts at a time we can handle, then loop
- * back and pick up where we left off
- */
- if (num_inserts == max_inserts) {
- INIT_LIST_HEAD(&insert_list);
- INIT_LIST_HEAD(&update_list);
- num_inserts = 0;
- goto again;
- }
-
- /*
- * again, if we need to make absolutely sure there are no more pending
- * extent operations left and we know that we skipped some, go back to
- * the beginning and do it all again
- */
- if (all && skipped) {
- INIT_LIST_HEAD(&insert_list);
- INIT_LIST_HEAD(&update_list);
- search = 0;
- skipped = 0;
- num_inserts = 0;
- goto again;
- }
-out:
- btrfs_free_path(path);
- return 0;
-}
-
static int pin_down_bytes(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
- u64 bytenr, u64 num_bytes, int is_data)
+ struct btrfs_path *path,
+ u64 bytenr, u64 num_bytes, int is_data,
+ struct extent_buffer **must_clean)
{
int err = 0;
struct extent_buffer *buf;
u64 header_transid = btrfs_header_generation(buf);
if (header_owner != BTRFS_TREE_LOG_OBJECTID &&
header_owner != BTRFS_TREE_RELOC_OBJECTID &&
+ header_owner != BTRFS_DATA_RELOC_TREE_OBJECTID &&
header_transid == trans->transid &&
!btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) {
- clean_tree_block(NULL, root, buf);
- btrfs_tree_unlock(buf);
- free_extent_buffer(buf);
+ *must_clean = buf;
return 1;
}
btrfs_tree_unlock(buf);
}
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);
BUG_ON(err < 0);
struct btrfs_root *root,
u64 bytenr, u64 num_bytes, u64 parent,
u64 root_objectid, u64 ref_generation,
- u64 owner_objectid, int pin, int mark_free)
+ u64 owner_objectid, int pin, int mark_free,
+ int refs_to_drop)
{
struct btrfs_path *path;
struct btrfs_key key;
return -ENOMEM;
path->reada = 1;
+ path->leave_spinning = 1;
ret = lookup_extent_backref(trans, extent_root, path,
bytenr, parent, root_objectid,
ref_generation, owner_objectid, 1);
break;
}
if (!found_extent) {
- ret = remove_extent_backref(trans, extent_root, path);
+ ret = remove_extent_backref(trans, extent_root, path,
+ refs_to_drop);
BUG_ON(ret);
btrfs_release_path(extent_root, path);
+ path->leave_spinning = 1;
ret = btrfs_search_slot(trans, extent_root,
&key, path, -1, 1);
if (ret) {
btrfs_print_leaf(extent_root, path->nodes[0]);
WARN_ON(1);
printk(KERN_ERR "btrfs unable to find ref byte nr %llu "
- "root %llu gen %llu owner %llu\n",
+ "parent %llu root %llu gen %llu owner %llu\n",
(unsigned long long)bytenr,
+ (unsigned long long)parent,
(unsigned long long)root_objectid,
(unsigned long long)ref_generation,
(unsigned long long)owner_objectid);
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);
+ /*
+ * we're not allowed to delete the extent item if there
+ * are other delayed ref updates pending
+ */
+
+ BUG_ON(refs < refs_to_drop);
+ refs -= refs_to_drop;
+ btrfs_set_extent_refs(leaf, ei, refs);
btrfs_mark_buffer_dirty(leaf);
- if (refs == 0 && found_extent && path->slots[0] == extent_slot + 1) {
+ if (refs == 0 && found_extent &&
+ path->slots[0] == extent_slot + 1) {
struct btrfs_extent_ref *ref;
ref = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_extent_ref);
- BUG_ON(btrfs_ref_num_refs(leaf, ref) != 1);
+ BUG_ON(btrfs_ref_num_refs(leaf, ref) != refs_to_drop);
/* if the back ref and the extent are next to each other
* they get deleted below in one shot
*/
num_to_del = 2;
} else if (found_extent) {
/* otherwise delete the extent back ref */
- ret = remove_extent_backref(trans, extent_root, path);
+ ret = remove_extent_backref(trans, extent_root, path,
+ refs_to_drop);
BUG_ON(ret);
/* if refs are 0, we need to setup the path for deletion */
if (refs == 0) {
btrfs_release_path(extent_root, path);
+ path->leave_spinning = 1;
ret = btrfs_search_slot(trans, extent_root, &key, path,
-1, 1);
BUG_ON(ret);
if (refs == 0) {
u64 super_used;
u64 root_used;
+ struct extent_buffer *must_clean = NULL;
if (pin) {
- mutex_lock(&root->fs_info->pinned_mutex);
- ret = pin_down_bytes(trans, root, bytenr, num_bytes,
- owner_objectid >= BTRFS_FIRST_FREE_OBJECTID);
- mutex_unlock(&root->fs_info->pinned_mutex);
+ ret = pin_down_bytes(trans, root, path,
+ bytenr, num_bytes,
+ owner_objectid >= BTRFS_FIRST_FREE_OBJECTID,
+ &must_clean);
if (ret > 0)
mark_free = 1;
BUG_ON(ret < 0);
}
+
/* block accounting for super block */
spin_lock(&info->delalloc_lock);
super_used = btrfs_super_bytes_used(&info->super_copy);
btrfs_set_root_used(&root->root_item,
root_used - num_bytes);
spin_unlock(&info->delalloc_lock);
+
+ /*
+ * it is going to be very rare for someone to be waiting
+ * on the block we're freeing. del_items might need to
+ * schedule, so rather than get fancy, just force it
+ * to blocking here
+ */
+ if (must_clean)
+ btrfs_set_lock_blocking(must_clean);
+
ret = btrfs_del_items(trans, extent_root, path, path->slots[0],
num_to_del);
BUG_ON(ret);
btrfs_release_path(extent_root, path);
- if (owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
- ret = btrfs_del_csums(trans, root, bytenr, num_bytes);
- BUG_ON(ret);
- }
-
- ret = update_block_group(trans, root, bytenr, num_bytes, 0,
- mark_free);
- BUG_ON(ret);
- }
- btrfs_free_path(path);
- finish_current_insert(trans, extent_root, 0);
- return ret;
-}
-
-/*
- * find all the blocks marked as pending in the radix tree and remove
- * them from the extent map
- */
-static int del_pending_extents(struct btrfs_trans_handle *trans,
- struct btrfs_root *extent_root, int all)
-{
- int ret;
- int err = 0;
- u64 start;
- u64 end;
- u64 priv;
- u64 search = 0;
- int nr = 0, skipped = 0;
- struct extent_io_tree *pending_del;
- struct extent_io_tree *extent_ins;
- struct pending_extent_op *extent_op;
- struct btrfs_fs_info *info = extent_root->fs_info;
- struct list_head delete_list;
-
- INIT_LIST_HEAD(&delete_list);
- extent_ins = &extent_root->fs_info->extent_ins;
- pending_del = &extent_root->fs_info->pending_del;
-
-again:
- mutex_lock(&info->extent_ins_mutex);
- while (1) {
- ret = find_first_extent_bit(pending_del, search, &start, &end,
- EXTENT_WRITEBACK);
- if (ret) {
- if (all && skipped && !nr) {
- search = 0;
- continue;
- }
- mutex_unlock(&info->extent_ins_mutex);
- break;
- }
-
- ret = try_lock_extent(extent_ins, start, end, GFP_NOFS);
- if (!ret) {
- search = end+1;
- skipped = 1;
-
- if (need_resched()) {
- mutex_unlock(&info->extent_ins_mutex);
- cond_resched();
- mutex_lock(&info->extent_ins_mutex);
- }
-
- continue;
- }
- BUG_ON(ret < 0);
-
- ret = get_state_private(pending_del, start, &priv);
- BUG_ON(ret);
- extent_op = (struct pending_extent_op *)(unsigned long)priv;
-
- clear_extent_bits(pending_del, start, end, EXTENT_WRITEBACK,
- GFP_NOFS);
- if (!test_range_bit(extent_ins, start, end,
- EXTENT_WRITEBACK, 0)) {
- list_add_tail(&extent_op->list, &delete_list);
- nr++;
- } else {
- kfree(extent_op);
-
- ret = get_state_private(&info->extent_ins, start,
- &priv);
- BUG_ON(ret);
- extent_op = (struct pending_extent_op *)
- (unsigned long)priv;
-
- clear_extent_bits(&info->extent_ins, start, end,
- EXTENT_WRITEBACK, GFP_NOFS);
-
- if (extent_op->type == PENDING_BACKREF_UPDATE) {
- list_add_tail(&extent_op->list, &delete_list);
- search = end + 1;
- nr++;
- continue;
- }
-
- mutex_lock(&extent_root->fs_info->pinned_mutex);
- ret = pin_down_bytes(trans, extent_root, start,
- end + 1 - start, 0);
- mutex_unlock(&extent_root->fs_info->pinned_mutex);
-
- ret = update_block_group(trans, extent_root, start,
- end + 1 - start, 0, ret > 0);
-
- unlock_extent(extent_ins, start, end, GFP_NOFS);
- BUG_ON(ret);
- kfree(extent_op);
+ if (must_clean) {
+ clean_tree_block(NULL, root, must_clean);
+ btrfs_tree_unlock(must_clean);
+ free_extent_buffer(must_clean);
}
- if (ret)
- err = ret;
-
- search = end + 1;
- if (need_resched()) {
- mutex_unlock(&info->extent_ins_mutex);
- cond_resched();
- mutex_lock(&info->extent_ins_mutex);
+ if (owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
+ ret = btrfs_del_csums(trans, root, bytenr, num_bytes);
+ BUG_ON(ret);
}
- }
- if (nr) {
- ret = free_extents(trans, extent_root, &delete_list);
+ ret = update_block_group(trans, root, bytenr, num_bytes, 0,
+ mark_free);
BUG_ON(ret);
}
-
- if (all && skipped) {
- INIT_LIST_HEAD(&delete_list);
- search = 0;
- nr = 0;
- goto again;
- }
-
- return err;
+ btrfs_free_path(path);
+ return ret;
}
/*
* remove an extent from the root, returns 0 on success
*/
static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- u64 bytenr, u64 num_bytes, u64 parent,
- u64 root_objectid, u64 ref_generation,
- u64 owner_objectid, int pin)
+ struct btrfs_root *root,
+ u64 bytenr, u64 num_bytes, u64 parent,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner_objectid, int pin,
+ int refs_to_drop)
{
- struct btrfs_root *extent_root = root->fs_info->extent_root;
- int pending_ret;
- int ret;
-
WARN_ON(num_bytes < root->sectorsize);
- if (root == extent_root) {
- struct pending_extent_op *extent_op = NULL;
-
- mutex_lock(&root->fs_info->extent_ins_mutex);
- if (test_range_bit(&root->fs_info->extent_ins, bytenr,
- bytenr + num_bytes - 1, EXTENT_WRITEBACK, 0)) {
- u64 priv;
- ret = get_state_private(&root->fs_info->extent_ins,
- bytenr, &priv);
- BUG_ON(ret);
- extent_op = (struct pending_extent_op *)
- (unsigned long)priv;
-
- extent_op->del = 1;
- if (extent_op->type == PENDING_EXTENT_INSERT) {
- mutex_unlock(&root->fs_info->extent_ins_mutex);
- return 0;
- }
- }
- if (extent_op) {
- ref_generation = extent_op->orig_generation;
- parent = extent_op->orig_parent;
- }
-
- extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS);
- BUG_ON(!extent_op);
-
- extent_op->type = PENDING_EXTENT_DELETE;
- extent_op->bytenr = bytenr;
- extent_op->num_bytes = num_bytes;
- extent_op->parent = parent;
- extent_op->orig_parent = parent;
- extent_op->generation = ref_generation;
- extent_op->orig_generation = ref_generation;
- extent_op->level = (int)owner_objectid;
- INIT_LIST_HEAD(&extent_op->list);
- extent_op->del = 0;
-
- set_extent_bits(&root->fs_info->pending_del,
- bytenr, bytenr + num_bytes - 1,
- EXTENT_WRITEBACK, GFP_NOFS);
- set_state_private(&root->fs_info->pending_del,
- bytenr, (unsigned long)extent_op);
- mutex_unlock(&root->fs_info->extent_ins_mutex);
- return 0;
- }
- /* if metadata always pin */
- if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID) {
- if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) {
- struct btrfs_block_group_cache *cache;
-
- /* btrfs_free_reserved_extent */
- cache = btrfs_lookup_block_group(root->fs_info, bytenr);
- BUG_ON(!cache);
- btrfs_add_free_space(cache, bytenr, num_bytes);
- put_block_group(cache);
- update_reserved_extents(root, bytenr, num_bytes, 0);
- return 0;
- }
+ /*
+ * if metadata always pin
+ * if data pin when any transaction has committed this
+ */
+ if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID ||
+ ref_generation != trans->transid)
pin = 1;
- }
- /* if data pin when any transaction has committed this */
if (ref_generation != trans->transid)
pin = 1;
- ret = __free_extent(trans, root, bytenr, num_bytes, parent,
+ return __free_extent(trans, root, bytenr, num_bytes, parent,
root_objectid, ref_generation,
- owner_objectid, pin, pin == 0);
+ owner_objectid, pin, pin == 0, refs_to_drop);
+}
+
+/*
+ * when we free an extent, it is possible (and likely) that we free the last
+ * delayed ref for that extent as well. This searches the delayed ref tree for
+ * a given extent, and if there are no other delayed refs to be processed, it
+ * removes it from the tree.
+ */
+static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 bytenr)
+{
+ struct btrfs_delayed_ref_head *head;
+ struct btrfs_delayed_ref_root *delayed_refs;
+ struct btrfs_delayed_ref_node *ref;
+ struct rb_node *node;
+ int ret;
+
+ delayed_refs = &trans->transaction->delayed_refs;
+ spin_lock(&delayed_refs->lock);
+ head = btrfs_find_delayed_ref_head(trans, bytenr);
+ if (!head)
+ goto out;
+
+ node = rb_prev(&head->node.rb_node);
+ if (!node)
+ goto out;
+
+ ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node);
+
+ /* there are still entries for this ref, we can't drop it */
+ if (ref->bytenr == bytenr)
+ goto out;
+
+ /*
+ * waiting for the lock here would deadlock. If someone else has it
+ * locked they are already in the process of dropping it anyway
+ */
+ if (!mutex_trylock(&head->mutex))
+ goto out;
+
+ /*
+ * at this point we have a head with no other entries. Go
+ * ahead and process it.
+ */
+ head->node.in_tree = 0;
+ rb_erase(&head->node.rb_node, &delayed_refs->root);
+
+ delayed_refs->num_entries--;
+
+ /*
+ * we don't take a ref on the node because we're removing it from the
+ * tree, so we just steal the ref the tree was holding.
+ */
+ delayed_refs->num_heads--;
+ if (list_empty(&head->cluster))
+ delayed_refs->num_heads_ready--;
+
+ list_del_init(&head->cluster);
+ spin_unlock(&delayed_refs->lock);
- finish_current_insert(trans, root->fs_info->extent_root, 0);
- pending_ret = del_pending_extents(trans, root->fs_info->extent_root, 0);
- return ret ? ret : pending_ret;
+ ret = run_one_delayed_ref(trans, root->fs_info->tree_root,
+ &head->node, head->must_insert_reserved);
+ BUG_ON(ret);
+ btrfs_put_delayed_ref(&head->node);
+ return 0;
+out:
+ spin_unlock(&delayed_refs->lock);
+ return 0;
}
int btrfs_free_extent(struct btrfs_trans_handle *trans,
{
int ret;
- ret = __btrfs_free_extent(trans, root, bytenr, num_bytes, parent,
- root_objectid, ref_generation,
- owner_objectid, pin);
+ /*
+ * tree log blocks never actually go into the extent allocation
+ * tree, just update pinning info and exit early.
+ *
+ * data extents referenced by the tree log do need to have
+ * their reference counts bumped.
+ */
+ 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);
+ ret = 0;
+ } else {
+ ret = btrfs_add_delayed_ref(trans, bytenr, num_bytes, parent,
+ root_objectid, ref_generation,
+ owner_objectid,
+ BTRFS_DROP_DELAYED_REF, 1);
+ BUG_ON(ret);
+ ret = check_ref_cleanup(trans, root, bytenr);
+ BUG_ON(ret);
+ }
return ret;
}
if (data & BTRFS_BLOCK_GROUP_METADATA) {
last_ptr = &root->fs_info->last_alloc;
- empty_cluster = 64 * 1024;
+ if (!btrfs_test_opt(root, SSD))
+ empty_cluster = 64 * 1024;
}
if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD))
static void dump_space_info(struct btrfs_space_info *info, u64 bytes)
{
struct btrfs_block_group_cache *cache;
- struct list_head *l;
printk(KERN_INFO "space_info has %llu free, is %sfull\n",
(unsigned long long)(info->total_bytes - info->bytes_used -
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);
down_read(&info->groups_sem);
- list_for_each(l, &info->block_groups) {
- cache = list_entry(l, struct btrfs_block_group_cache, list);
+ list_for_each_entry(cache, &info->block_groups, list) {
spin_lock(&cache->lock);
printk(KERN_INFO "block group %llu has %llu bytes, %llu used "
"%llu pinned %llu reserved\n",
{
int ret;
u64 search_start = 0;
- u64 alloc_profile;
struct btrfs_fs_info *info = root->fs_info;
- 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;
- }
+ data = btrfs_get_alloc_profile(root, data);
again:
- data = btrfs_reduce_alloc_profile(root, data);
/*
* the only place that sets empty_size is btrfs_realloc_node, which
* is not called recursively on allocations
static int __btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 parent,
u64 root_objectid, u64 ref_generation,
- u64 owner, struct btrfs_key *ins)
+ u64 owner, struct btrfs_key *ins,
+ int ref_mod)
{
int ret;
- int pending_ret;
u64 super_used;
u64 root_used;
u64 num_bytes = ins->offset;
btrfs_set_root_used(&root->root_item, root_used + num_bytes);
spin_unlock(&info->delalloc_lock);
- if (root == extent_root) {
- struct pending_extent_op *extent_op;
-
- extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS);
- BUG_ON(!extent_op);
-
- extent_op->type = PENDING_EXTENT_INSERT;
- extent_op->bytenr = ins->objectid;
- extent_op->num_bytes = ins->offset;
- extent_op->parent = parent;
- extent_op->orig_parent = 0;
- extent_op->generation = ref_generation;
- extent_op->orig_generation = 0;
- extent_op->level = (int)owner;
- INIT_LIST_HEAD(&extent_op->list);
- extent_op->del = 0;
-
- mutex_lock(&root->fs_info->extent_ins_mutex);
- set_extent_bits(&root->fs_info->extent_ins, ins->objectid,
- ins->objectid + ins->offset - 1,
- EXTENT_WRITEBACK, GFP_NOFS);
- set_state_private(&root->fs_info->extent_ins,
- ins->objectid, (unsigned long)extent_op);
- mutex_unlock(&root->fs_info->extent_ins_mutex);
- goto update_block;
- }
-
memcpy(&keys[0], ins, sizeof(*ins));
keys[1].objectid = ins->objectid;
keys[1].type = BTRFS_EXTENT_REF_KEY;
path = btrfs_alloc_path();
BUG_ON(!path);
+ path->leave_spinning = 1;
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);
+ btrfs_set_extent_refs(path->nodes[0], extent_item, ref_mod);
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_num_refs(path->nodes[0], ref, 1);
+ btrfs_set_ref_num_refs(path->nodes[0], ref, ref_mod);
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, 0);
- pending_ret = del_pending_extents(trans, extent_root, 0);
if (ret)
goto out;
- if (pending_ret) {
- ret = pending_ret;
- goto out;
- }
-update_block:
ret = update_block_group(trans, root, ins->objectid,
ins->offset, 1, 0);
if (ret) {
if (root_objectid == BTRFS_TREE_LOG_OBJECTID)
return 0;
- ret = __btrfs_alloc_reserved_extent(trans, root, parent, root_objectid,
- ref_generation, owner, ins);
- update_reserved_extents(root, ins->objectid, ins->offset, 0);
+
+ ret = btrfs_add_delayed_ref(trans, ins->objectid,
+ ins->offset, parent, root_objectid,
+ ref_generation, owner,
+ BTRFS_ADD_DELAYED_EXTENT, 0);
+ BUG_ON(ret);
return ret;
}
BUG_ON(ret);
put_block_group(block_group);
ret = __btrfs_alloc_reserved_extent(trans, root, parent, root_objectid,
- ref_generation, owner, ins);
+ ref_generation, owner, ins, 1);
return ret;
}
u64 search_end, struct btrfs_key *ins, u64 data)
{
int ret;
-
ret = __btrfs_reserve_extent(trans, root, num_bytes,
min_alloc_size, empty_size, hint_byte,
search_end, ins, data);
BUG_ON(ret);
if (root_objectid != BTRFS_TREE_LOG_OBJECTID) {
- ret = __btrfs_alloc_reserved_extent(trans, root, parent,
- root_objectid, ref_generation,
- owner_objectid, ins);
+ ret = btrfs_add_delayed_ref(trans, ins->objectid,
+ ins->offset, parent, root_objectid,
+ ref_generation, owner_objectid,
+ BTRFS_ADD_DELAYED_EXTENT, 0);
BUG_ON(ret);
-
- } else {
- update_reserved_extents(root, ins->objectid, ins->offset, 1);
}
+ update_reserved_extents(root, ins->objectid, ins->offset, 1);
return ret;
}
struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
- u64 bytenr, u32 blocksize)
+ u64 bytenr, u32 blocksize,
+ int level)
{
struct extent_buffer *buf;
if (!buf)
return ERR_PTR(-ENOMEM);
btrfs_set_header_generation(buf, trans->transid);
+ btrfs_set_buffer_lockdep_class(buf, level);
btrfs_tree_lock(buf);
clean_tree_block(trans, root, buf);
+
+ btrfs_set_lock_blocking(buf);
btrfs_set_buffer_uptodate(buf);
+
if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) {
set_extent_dirty(&root->dirty_log_pages, buf->start,
buf->start + buf->len - 1, GFP_NOFS);
buf->start + buf->len - 1, GFP_NOFS);
}
trans->blocks_used++;
+ /* this returns a buffer locked for blocking */
return buf;
}
return ERR_PTR(ret);
}
- buf = btrfs_init_new_buffer(trans, root, ins.objectid, blocksize);
+ buf = btrfs_init_new_buffer(trans, root, ins.objectid,
+ blocksize, level);
return buf;
}
{
u64 leaf_owner;
u64 leaf_generation;
+ struct refsort *sorted;
struct btrfs_key key;
struct btrfs_file_extent_item *fi;
int i;
int nritems;
int ret;
+ int refi = 0;
+ int slot;
BUG_ON(!btrfs_is_leaf(leaf));
nritems = btrfs_header_nritems(leaf);
leaf_owner = btrfs_header_owner(leaf);
leaf_generation = btrfs_header_generation(leaf);
+ sorted = kmalloc(sizeof(*sorted) * nritems, GFP_NOFS);
+ /* we do this loop twice. The first time we build a list
+ * of the extents we have a reference on, then we sort the list
+ * by bytenr. The second time around we actually do the
+ * extent freeing.
+ */
for (i = 0; i < nritems; i++) {
u64 disk_bytenr;
cond_resched();
btrfs_item_key_to_cpu(leaf, &key, i);
+
+ /* only extents have references, skip everything else */
if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
continue;
+
fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item);
+
+ /* inline extents live in the btree, they don't have refs */
if (btrfs_file_extent_type(leaf, fi) ==
BTRFS_FILE_EXTENT_INLINE)
continue;
- /*
- * FIXME make sure to insert a trans record that
- * repeats the snapshot del on crash
- */
+
disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
+
+ /* holes don't have refs */
if (disk_bytenr == 0)
continue;
- ret = __btrfs_free_extent(trans, root, disk_bytenr,
+ sorted[refi].bytenr = disk_bytenr;
+ sorted[refi].slot = i;
+ refi++;
+ }
+
+ if (refi == 0)
+ goto out;
+
+ sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL);
+
+ for (i = 0; i < refi; i++) {
+ u64 disk_bytenr;
+
+ disk_bytenr = sorted[i].bytenr;
+ slot = sorted[i].slot;
+
+ cond_resched();
+
+ btrfs_item_key_to_cpu(leaf, &key, slot);
+ if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
+ continue;
+
+ fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
+
+ ret = btrfs_free_extent(trans, root, disk_bytenr,
btrfs_file_extent_disk_num_bytes(leaf, fi),
leaf->start, leaf_owner, leaf_generation,
key.objectid, 0);
wake_up(&root->fs_info->transaction_throttle);
cond_resched();
}
+out:
+ kfree(sorted);
return 0;
}
{
int i;
int ret;
- struct btrfs_extent_info *info = ref->extents;
+ struct btrfs_extent_info *info;
+ struct refsort *sorted;
+
+ if (ref->nritems == 0)
+ return 0;
+ sorted = kmalloc(sizeof(*sorted) * ref->nritems, GFP_NOFS);
for (i = 0; i < ref->nritems; i++) {
- ret = __btrfs_free_extent(trans, root, info->bytenr,
+ sorted[i].bytenr = ref->extents[i].bytenr;
+ sorted[i].slot = i;
+ }
+ sort(sorted, ref->nritems, sizeof(struct refsort), refsort_cmp, NULL);
+
+ /*
+ * the items in the ref were sorted when the ref was inserted
+ * into the ref cache, so this is already in order
+ */
+ for (i = 0; i < ref->nritems; i++) {
+ info = ref->extents + sorted[i].slot;
+ ret = btrfs_free_extent(trans, root, info->bytenr,
info->num_bytes, ref->bytenr,
ref->owner, ref->generation,
info->objectid, 0);
info++;
}
+ kfree(sorted);
return 0;
}
-static int drop_snap_lookup_refcount(struct btrfs_root *root, u64 start,
+static int drop_snap_lookup_refcount(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 start,
u64 len, u32 *refs)
{
int ret;
- ret = btrfs_lookup_extent_ref(NULL, root, start, len, refs);
+ ret = btrfs_lookup_extent_ref(trans, root, start, len, refs);
BUG_ON(ret);
#if 0 /* some debugging code in case we see problems here */
return ret;
}
+/*
+ * this is used while deleting old snapshots, and it drops the refs
+ * on a whole subtree starting from a level 1 node.
+ *
+ * The idea is to sort all the leaf pointers, and then drop the
+ * ref on all the leaves in order. Most of the time the leaves
+ * will have ref cache entries, so no leaf IOs will be required to
+ * find the extents they have references on.
+ *
+ * For each leaf, any references it has are also dropped in order
+ *
+ * This ends up dropping the references in something close to optimal
+ * order for reading and modifying the extent allocation tree.
+ */
+static noinline int drop_level_one_refs(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path)
+{
+ u64 bytenr;
+ u64 root_owner;
+ u64 root_gen;
+ struct extent_buffer *eb = path->nodes[1];
+ struct extent_buffer *leaf;
+ struct btrfs_leaf_ref *ref;
+ struct refsort *sorted = NULL;
+ int nritems = btrfs_header_nritems(eb);
+ int ret;
+ int i;
+ int refi = 0;
+ int slot = path->slots[1];
+ u32 blocksize = btrfs_level_size(root, 0);
+ u32 refs;
+
+ if (nritems == 0)
+ goto out;
+
+ root_owner = btrfs_header_owner(eb);
+ root_gen = btrfs_header_generation(eb);
+ sorted = kmalloc(sizeof(*sorted) * nritems, GFP_NOFS);
+
+ /*
+ * step one, sort all the leaf pointers so we don't scribble
+ * randomly into the extent allocation tree
+ */
+ for (i = slot; i < nritems; i++) {
+ sorted[refi].bytenr = btrfs_node_blockptr(eb, i);
+ sorted[refi].slot = i;
+ refi++;
+ }
+
+ /*
+ * nritems won't be zero, but if we're picking up drop_snapshot
+ * after a crash, slot might be > 0, so double check things
+ * just in case.
+ */
+ if (refi == 0)
+ goto out;
+
+ sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL);
+
+ /*
+ * the first loop frees everything the leaves point to
+ */
+ for (i = 0; i < refi; i++) {
+ u64 ptr_gen;
+
+ bytenr = sorted[i].bytenr;
+
+ /*
+ * check the reference count on this leaf. If it is > 1
+ * we just decrement it below and don't update any
+ * of the refs the leaf points to.
+ */
+ ret = drop_snap_lookup_refcount(trans, root, bytenr,
+ blocksize, &refs);
+ BUG_ON(ret);
+ if (refs != 1)
+ continue;
+
+ ptr_gen = btrfs_node_ptr_generation(eb, sorted[i].slot);
+
+ /*
+ * the leaf only had one reference, which means the
+ * only thing pointing to this leaf is the snapshot
+ * we're deleting. It isn't possible for the reference
+ * count to increase again later
+ *
+ * The reference cache is checked for the leaf,
+ * and if found we'll be able to drop any refs held by
+ * the leaf without needing to read it in.
+ */
+ ref = btrfs_lookup_leaf_ref(root, bytenr);
+ if (ref && ref->generation != ptr_gen) {
+ btrfs_free_leaf_ref(root, ref);
+ ref = NULL;
+ }
+ if (ref) {
+ ret = cache_drop_leaf_ref(trans, root, ref);
+ BUG_ON(ret);
+ btrfs_remove_leaf_ref(root, ref);
+ btrfs_free_leaf_ref(root, ref);
+ } else {
+ /*
+ * the leaf wasn't in the reference cache, so
+ * we have to read it.
+ */
+ leaf = read_tree_block(root, bytenr, blocksize,
+ ptr_gen);
+ ret = btrfs_drop_leaf_ref(trans, root, leaf);
+ BUG_ON(ret);
+ free_extent_buffer(leaf);
+ }
+ atomic_inc(&root->fs_info->throttle_gen);
+ wake_up(&root->fs_info->transaction_throttle);
+ cond_resched();
+ }
+
+ /*
+ * run through the loop again to free the refs on the leaves.
+ * This is faster than doing it in the loop above because
+ * the leaves are likely to be clustered together. We end up
+ * working in nice chunks on the extent allocation tree.
+ */
+ for (i = 0; i < refi; i++) {
+ bytenr = sorted[i].bytenr;
+ ret = btrfs_free_extent(trans, root, bytenr,
+ blocksize, eb->start,
+ root_owner, root_gen, 0, 1);
+ BUG_ON(ret);
+
+ atomic_inc(&root->fs_info->throttle_gen);
+ wake_up(&root->fs_info->transaction_throttle);
+ cond_resched();
+ }
+out:
+ kfree(sorted);
+
+ /*
+ * update the path to show we've processed the entire level 1
+ * node. This will get saved into the root's drop_snapshot_progress
+ * field so these drops are not repeated again if this transaction
+ * commits.
+ */
+ path->slots[1] = nritems;
+ return 0;
+}
+
/*
* helper function for drop_snapshot, this walks down the tree dropping ref
* counts as it goes.
struct extent_buffer *next;
struct extent_buffer *cur;
struct extent_buffer *parent;
- struct btrfs_leaf_ref *ref;
u32 blocksize;
int ret;
u32 refs;
WARN_ON(*level < 0);
WARN_ON(*level >= BTRFS_MAX_LEVEL);
- ret = drop_snap_lookup_refcount(root, path->nodes[*level]->start,
+ ret = drop_snap_lookup_refcount(trans, root, path->nodes[*level]->start,
path->nodes[*level]->len, &refs);
BUG_ON(ret);
if (refs > 1)
if (path->slots[*level] >=
btrfs_header_nritems(cur))
break;
+
+ /* the new code goes down to level 1 and does all the
+ * leaves pointed to that node in bulk. So, this check
+ * for level 0 will always be false.
+ *
+ * But, the disk format allows the drop_snapshot_progress
+ * field in the root to leave things in a state where
+ * a leaf will need cleaning up here. If someone crashes
+ * with the old code and then boots with the new code,
+ * we might find a leaf here.
+ */
if (*level == 0) {
ret = btrfs_drop_leaf_ref(trans, root, cur);
BUG_ON(ret);
break;
}
+
+ /*
+ * once we get to level one, process the whole node
+ * at once, including everything below it.
+ */
+ if (*level == 1) {
+ ret = drop_level_one_refs(trans, root, path);
+ BUG_ON(ret);
+ 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 = drop_snap_lookup_refcount(root, bytenr, blocksize, &refs);
+ ret = drop_snap_lookup_refcount(trans, root, bytenr,
+ blocksize, &refs);
BUG_ON(ret);
+
+ /*
+ * if there is more than one reference, we don't need
+ * to read that node to drop any references it has. We
+ * just drop the ref we hold on that node and move on to the
+ * next slot in this level.
+ */
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, parent->start,
root_owner, root_gen,
*level - 1, 1);
continue;
}
+
/*
- * at this point, we have a single ref, and since the
- * only place referencing this extent is a dead root
- * the reference count should never go higher.
- * So, we don't need to check it again
+ * we need to keep freeing things in the next level down.
+ * read the block and loop around to process it
*/
- if (*level == 1) {
- ref = btrfs_lookup_leaf_ref(root, bytenr);
- if (ref && ref->generation != ptr_gen) {
- btrfs_free_leaf_ref(root, ref);
- ref = NULL;
- }
- if (ref) {
- ret = cache_drop_leaf_ref(trans, root, ref);
- BUG_ON(ret);
- btrfs_remove_leaf_ref(root, ref);
- btrfs_free_leaf_ref(root, ref);
- *level = 0;
- break;
- }
- }
- next = btrfs_find_tree_block(root, bytenr, blocksize);
- if (!next || !btrfs_buffer_uptodate(next, ptr_gen)) {
- free_extent_buffer(next);
-
- next = read_tree_block(root, bytenr, blocksize,
- ptr_gen);
- cond_resched();
-#if 0
- /*
- * this is a debugging check and can go away
- * the ref should never go all the way down to 1
- * at this point
- */
- ret = lookup_extent_ref(NULL, root, bytenr, blocksize,
- &refs);
- BUG_ON(ret);
- WARN_ON(refs != 1);
-#endif
- }
+ next = read_tree_block(root, bytenr, blocksize, ptr_gen);
WARN_ON(*level <= 0);
if (path->nodes[*level-1])
free_extent_buffer(path->nodes[*level-1]);
root_owner = btrfs_header_owner(parent);
root_gen = btrfs_header_generation(parent);
- ret = __btrfs_free_extent(trans, root, bytenr, blocksize,
+ /*
+ * cleanup and free the reference on the last node
+ * we processed
+ */
+ ret = btrfs_free_extent(trans, root, bytenr, blocksize,
parent->start, root_owner, root_gen,
*level, 1);
free_extent_buffer(path->nodes[*level]);
path->nodes[*level] = NULL;
+
*level += 1;
BUG_ON(ret);
next = read_tree_block(root, bytenr, blocksize, ptr_gen);
btrfs_tree_lock(next);
+ btrfs_set_lock_blocking(next);
ret = btrfs_lookup_extent_ref(trans, root, bytenr, blocksize,
&refs);
if (slot < btrfs_header_nritems(path->nodes[i]) - 1) {
struct extent_buffer *node;
struct btrfs_disk_key disk_key;
+
+ /*
+ * there is more work to do in this level.
+ * Update the drop_progress marker to reflect
+ * the work we've done so far, and then bump
+ * the slot number
+ */
node = path->nodes[i];
path->slots[i]++;
*level = i;
return 0;
} else {
struct extent_buffer *parent;
+
+ /*
+ * this whole node is done, free our reference
+ * on it and go up one level
+ */
if (path->nodes[*level] == root->node)
parent = path->nodes[*level];
else
struct btrfs_path *path;
int i;
int orig_level;
+ int update_count;
struct btrfs_root_item *root_item = &root->root_item;
WARN_ON(!mutex_is_locked(&root->fs_info->drop_mutex));
}
}
while (1) {
+ unsigned long update;
wret = walk_down_tree(trans, root, path, &level);
if (wret > 0)
break;
break;
if (wret < 0)
ret = wret;
- if (trans->transaction->in_commit) {
+ if (trans->transaction->in_commit ||
+ trans->transaction->delayed_refs.flushing) {
ret = -EAGAIN;
break;
}
atomic_inc(&root->fs_info->throttle_gen);
wake_up(&root->fs_info->transaction_throttle);
+ for (update_count = 0; update_count < 16; update_count++) {
+ update = trans->delayed_ref_updates;
+ trans->delayed_ref_updates = 0;
+ if (update)
+ btrfs_run_delayed_refs(trans, root, update);
+ else
+ break;
+ }
}
for (i = 0; i <= orig_level; i++) {
if (path->nodes[i]) {
path = btrfs_alloc_path();
BUG_ON(!path);
- BUG_ON(!btrfs_tree_locked(parent));
+ btrfs_assert_tree_locked(parent);
parent_level = btrfs_header_level(parent);
extent_buffer_get(parent);
path->nodes[parent_level] = parent;
path->slots[parent_level] = btrfs_header_nritems(parent);
- BUG_ON(!btrfs_tree_locked(node));
+ btrfs_assert_tree_locked(node);
level = btrfs_header_level(node);
extent_buffer_get(node);
path->nodes[level] = node;
u64 lock_end = 0;
u64 num_bytes;
u64 ext_offset;
- u64 first_pos;
+ u64 search_end = (u64)-1;
u32 nritems;
int nr_scaned = 0;
int extent_locked = 0;
int ret;
memcpy(&key, leaf_key, sizeof(key));
- first_pos = INT_LIMIT(loff_t) - extent_key->offset;
if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) {
if (key.objectid < ref_path->owner_objectid ||
(key.objectid == ref_path->owner_objectid &&
if ((key.objectid > ref_path->owner_objectid) ||
(key.objectid == ref_path->owner_objectid &&
key.type > BTRFS_EXTENT_DATA_KEY) ||
- (key.offset >= first_pos + extent_key->offset))
+ key.offset >= search_end)
break;
}
num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
ext_offset = btrfs_file_extent_offset(leaf, fi);
- if (first_pos > key.offset - ext_offset)
- first_pos = key.offset - ext_offset;
+ if (search_end == (u64)-1) {
+ search_end = key.offset - ext_offset +
+ btrfs_file_extent_ram_bytes(leaf, fi);
+ }
if (!extent_locked) {
lock_start = key.offset;
}
skip:
if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS &&
- key.offset >= first_pos + extent_key->offset)
+ key.offset >= search_end)
break;
cond_resched();
ref->bytenr = buf->start;
ref->owner = btrfs_header_owner(buf);
ref->generation = btrfs_header_generation(buf);
+
ret = btrfs_add_leaf_ref(root, ref, 0);
WARN_ON(ret);
btrfs_free_leaf_ref(root, ref);
root->root_key.objectid,
trans->transid, key.objectid);
BUG_ON(ret);
+
ret = btrfs_free_extent(trans, root,
bytenr, num_bytes, leaf->start,
btrfs_header_owner(leaf),
ref_path, NULL, NULL);
BUG_ON(ret);
- if (root == root->fs_info->extent_root)
- btrfs_extent_post_op(trans, root);
-
return 0;
}
prev_block = block_start;
}
+ mutex_lock(&extent_root->fs_info->trans_mutex);
btrfs_record_root_in_trans(found_root);
+ mutex_unlock(&extent_root->fs_info->trans_mutex);
if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
/*
* try to update data extent references while
if (!path)
return -ENOMEM;
+ path->leave_spinning = 1;
ret = btrfs_insert_empty_inode(trans, root, path, objectid);
if (ret)
goto out;
btrfs_remove_leaf_refs(info->tree_root, (u64)-1, 1);
mutex_unlock(&root->fs_info->cleaner_mutex);
+ trans = btrfs_start_transaction(info->tree_root, 1);
+ btrfs_commit_transaction(trans, info->tree_root);
+
while (1) {
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
int btrfs_free_block_groups(struct btrfs_fs_info *info)
{
struct btrfs_block_group_cache *block_group;
+ struct btrfs_space_info *space_info;
struct rb_node *n;
spin_lock(&info->block_group_cache_lock);
spin_lock(&info->block_group_cache_lock);
}
spin_unlock(&info->block_group_cache_lock);
+
+ /* now that all the block groups are freed, go through and
+ * free all the space_info structs. This is only called during
+ * the final stages of unmount, and so we know nobody is
+ * using them. We call synchronize_rcu() once before we start,
+ * just to be on the safe side.
+ */
+ synchronize_rcu();
+
+ while(!list_empty(&info->space_info)) {
+ space_info = list_entry(info->space_info.next,
+ struct btrfs_space_info,
+ list);
+
+ list_del(&space_info->list);
+ kfree(space_info);
+ }
return 0;
}
sizeof(cache->item));
BUG_ON(ret);
- finish_current_insert(trans, extent_root, 0);
- ret = del_pending_extents(trans, extent_root, 0);
- BUG_ON(ret);
set_avail_alloc_bits(extent_root->fs_info, type);
return 0;
path = btrfs_alloc_path();
BUG_ON(!path);
- btrfs_remove_free_space_cache(block_group);
+ spin_lock(&root->fs_info->block_group_cache_lock);
rb_erase(&block_group->cache_node,
&root->fs_info->block_group_cache_tree);
+ 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);
up_write(&block_group->space_info->groups_sem);
projects / linux-2.6-omap-h63xx.git / blobdiff