#include <linux/sched.h>
#include <linux/pagemap.h>
#include <linux/writeback.h>
+#include <linux/blkdev.h>
#include "hash.h"
#include "crc32c.h"
#include "ctree.h"
#include "print-tree.h"
#include "transaction.h"
#include "volumes.h"
+#include "locking.h"
+#include "ref-cache.h"
-#define BLOCK_GROUP_DATA EXTENT_WRITEBACK
-#define BLOCK_GROUP_METADATA EXTENT_UPTODATE
-#define BLOCK_GROUP_SYSTEM EXTENT_NEW
+#define PENDING_EXTENT_INSERT 0
+#define PENDING_EXTENT_DELETE 1
+#define PENDING_BACKREF_UPDATE 2
-#define BLOCK_GROUP_DIRTY EXTENT_DIRTY
+struct pending_extent_op {
+ int type;
+ u64 bytenr;
+ u64 num_bytes;
+ u64 parent;
+ u64 orig_parent;
+ u64 generation;
+ u64 orig_generation;
+ int level;
+};
static int finish_current_insert(struct btrfs_trans_handle *trans, struct
btrfs_root *extent_root);
static int del_pending_extents(struct btrfs_trans_handle *trans, struct
btrfs_root *extent_root);
+static struct btrfs_block_group_cache *
+__btrfs_find_block_group(struct btrfs_root *root,
+ struct btrfs_block_group_cache *hint,
+ u64 search_start, int data, int owner);
+
+void maybe_lock_mutex(struct btrfs_root *root)
+{
+ if (root != root->fs_info->extent_root &&
+ root != root->fs_info->chunk_root &&
+ root != root->fs_info->dev_root) {
+ mutex_lock(&root->fs_info->alloc_mutex);
+ }
+}
+
+void maybe_unlock_mutex(struct btrfs_root *root)
+{
+ if (root != root->fs_info->extent_root &&
+ root != root->fs_info->chunk_root &&
+ root != root->fs_info->dev_root) {
+ mutex_unlock(&root->fs_info->alloc_mutex);
+ }
+}
+
+static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits)
+{
+ return (cache->flags & bits) == bits;
+}
+
+/*
+ * this adds the block group to the fs_info rb tree for the block group
+ * cache
+ */
+int btrfs_add_block_group_cache(struct btrfs_fs_info *info,
+ struct btrfs_block_group_cache *block_group)
+{
+ struct rb_node **p;
+ struct rb_node *parent = NULL;
+ struct btrfs_block_group_cache *cache;
+
+ spin_lock(&info->block_group_cache_lock);
+ p = &info->block_group_cache_tree.rb_node;
+
+ while (*p) {
+ parent = *p;
+ cache = rb_entry(parent, struct btrfs_block_group_cache,
+ cache_node);
+ if (block_group->key.objectid < cache->key.objectid) {
+ p = &(*p)->rb_left;
+ } else if (block_group->key.objectid > cache->key.objectid) {
+ p = &(*p)->rb_right;
+ } else {
+ spin_unlock(&info->block_group_cache_lock);
+ return -EEXIST;
+ }
+ }
+
+ rb_link_node(&block_group->cache_node, parent, p);
+ rb_insert_color(&block_group->cache_node,
+ &info->block_group_cache_tree);
+ spin_unlock(&info->block_group_cache_lock);
+
+ return 0;
+}
+
+/*
+ * This will return the block group at or after bytenr if contains is 0, else
+ * it will return the block group that contains the bytenr
+ */
+static struct btrfs_block_group_cache *
+block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr,
+ int contains)
+{
+ struct btrfs_block_group_cache *cache, *ret = NULL;
+ struct rb_node *n;
+ u64 end, start;
+
+ spin_lock(&info->block_group_cache_lock);
+ n = info->block_group_cache_tree.rb_node;
+
+ while (n) {
+ cache = rb_entry(n, struct btrfs_block_group_cache,
+ cache_node);
+ end = cache->key.objectid + cache->key.offset - 1;
+ start = cache->key.objectid;
+
+ if (bytenr < start) {
+ if (!contains && (!ret || start < ret->key.objectid))
+ ret = cache;
+ n = n->rb_left;
+ } else if (bytenr > start) {
+ if (contains && bytenr <= end) {
+ ret = cache;
+ break;
+ }
+ n = n->rb_right;
+ } else {
+ ret = cache;
+ break;
+ }
+ }
+ spin_unlock(&info->block_group_cache_lock);
+
+ return ret;
+}
+
+/*
+ * this is only called by cache_block_group, since we could have freed extents
+ * we need to check the pinned_extents for any extents that can't be used yet
+ * since their free space will be released as soon as the transaction commits.
+ */
+static int add_new_free_space(struct btrfs_block_group_cache *block_group,
+ struct btrfs_fs_info *info, u64 start, u64 end)
+{
+ u64 extent_start, extent_end, size;
+ int ret;
+ while (start < end) {
+ ret = find_first_extent_bit(&info->pinned_extents, start,
+ &extent_start, &extent_end,
+ EXTENT_DIRTY);
+ if (ret)
+ break;
+
+ if (extent_start == start) {
+ start = extent_end + 1;
+ } else if (extent_start > start && extent_start < end) {
+ size = extent_start - start;
+ ret = btrfs_add_free_space(block_group, start, size);
+ BUG_ON(ret);
+ start = extent_end + 1;
+ } else {
+ break;
+ }
+ }
+
+ if (start < end) {
+ size = end - start;
+ ret = btrfs_add_free_space(block_group, start, size);
+ BUG_ON(ret);
+ }
+
+ return 0;
+}
static int cache_block_group(struct btrfs_root *root,
struct btrfs_block_group_cache *block_group)
{
struct btrfs_path *path;
- int ret;
+ int ret = 0;
struct btrfs_key key;
struct extent_buffer *leaf;
- struct extent_io_tree *free_space_cache;
int slot;
u64 last = 0;
- u64 hole_size;
u64 first_free;
int found = 0;
return 0;
root = root->fs_info->extent_root;
- free_space_cache = &root->fs_info->free_space_cache;
if (block_group->cached)
return 0;
return -ENOMEM;
path->reada = 2;
- first_free = block_group->key.objectid;
+ /*
+ * we get into deadlocks with paths held by callers of this function.
+ * since the alloc_mutex is protecting things right now, just
+ * skip the locking here
+ */
+ path->skip_locking = 1;
+ first_free = max_t(u64, block_group->key.objectid,
+ BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE);
key.objectid = block_group->key.objectid;
key.offset = 0;
btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
- return ret;
+ goto err;
ret = btrfs_previous_item(root, path, 0, BTRFS_EXTENT_ITEM_KEY);
if (ret < 0)
- return ret;
+ goto err;
if (ret == 0) {
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
ret = btrfs_next_leaf(root, path);
if (ret < 0)
goto err;
- if (ret == 0) {
+ if (ret == 0)
continue;
- } else {
+ else
break;
- }
}
btrfs_item_key_to_cpu(leaf, &key, slot);
- if (key.objectid < block_group->key.objectid) {
+ if (key.objectid < block_group->key.objectid)
goto next;
- }
+
if (key.objectid >= block_group->key.objectid +
- block_group->key.offset) {
+ block_group->key.offset)
break;
- }
if (btrfs_key_type(&key) == BTRFS_EXTENT_ITEM_KEY) {
if (!found) {
last = first_free;
found = 1;
}
- if (key.objectid > last) {
- hole_size = key.objectid - last;
- set_extent_dirty(free_space_cache, last,
- last + hole_size - 1,
- GFP_NOFS);
- }
+
+ add_new_free_space(block_group, root->fs_info, last,
+ key.objectid);
+
last = key.objectid + key.offset;
}
next:
if (!found)
last = first_free;
- if (block_group->key.objectid +
- block_group->key.offset > last) {
- hole_size = block_group->key.objectid +
- block_group->key.offset - last;
- set_extent_dirty(free_space_cache, last,
- last + hole_size - 1, GFP_NOFS);
- }
+
+ add_new_free_space(block_group, root->fs_info, last,
+ block_group->key.objectid +
+ block_group->key.offset);
+
block_group->cached = 1;
+ ret = 0;
err:
btrfs_free_path(path);
- return 0;
+ return ret;
}
+/*
+ * return the block group that starts at or after bytenr
+ */
struct btrfs_block_group_cache *btrfs_lookup_first_block_group(struct
btrfs_fs_info *info,
u64 bytenr)
{
- struct extent_io_tree *block_group_cache;
- struct btrfs_block_group_cache *block_group = NULL;
- u64 ptr;
- u64 start;
- u64 end;
- int ret;
+ struct btrfs_block_group_cache *cache;
- bytenr = max_t(u64, bytenr,
- BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE);
- block_group_cache = &info->block_group_cache;
- ret = find_first_extent_bit(block_group_cache,
- bytenr, &start, &end,
- BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA |
- BLOCK_GROUP_SYSTEM);
- if (ret) {
- return NULL;
- }
- ret = get_state_private(block_group_cache, start, &ptr);
- if (ret)
- return NULL;
+ cache = block_group_cache_tree_search(info, bytenr, 0);
- block_group = (struct btrfs_block_group_cache *)(unsigned long)ptr;
- return block_group;
+ return cache;
}
+/*
+ * return the block group that contains teh given bytenr
+ */
struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
btrfs_fs_info *info,
u64 bytenr)
{
- struct extent_io_tree *block_group_cache;
- struct btrfs_block_group_cache *block_group = NULL;
- u64 ptr;
- u64 start;
- u64 end;
- int ret;
+ struct btrfs_block_group_cache *cache;
- bytenr = max_t(u64, bytenr,
- BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE);
- block_group_cache = &info->block_group_cache;
- ret = find_first_extent_bit(block_group_cache,
- bytenr, &start, &end,
- BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA |
- BLOCK_GROUP_SYSTEM);
- if (ret) {
- return NULL;
- }
- ret = get_state_private(block_group_cache, start, &ptr);
- if (ret)
- return NULL;
+ cache = block_group_cache_tree_search(info, bytenr, 1);
- block_group = (struct btrfs_block_group_cache *)(unsigned long)ptr;
- if (block_group->key.objectid <= bytenr && bytenr <
- block_group->key.objectid + block_group->key.offset)
- return block_group;
- return NULL;
+ return cache;
}
-static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits)
-{
- return (cache->flags & bits) == bits;
-}
-
-static int noinline find_search_start(struct btrfs_root *root,
- struct btrfs_block_group_cache **cache_ret,
- u64 *start_ret, u64 num, int data)
+static int noinline find_free_space(struct btrfs_root *root,
+ struct btrfs_block_group_cache **cache_ret,
+ u64 *start_ret, u64 num, int data)
{
int ret;
struct btrfs_block_group_cache *cache = *cache_ret;
- struct extent_io_tree *free_space_cache;
- struct extent_state *state;
+ struct btrfs_free_space *info = NULL;
u64 last;
- u64 start = 0;
- u64 cache_miss = 0;
u64 total_fs_bytes;
u64 search_start = *start_ret;
- int wrapped = 0;
+ WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex));
total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
- free_space_cache = &root->fs_info->free_space_cache;
if (!cache)
goto out;
+ last = max(search_start, cache->key.objectid);
+
again:
ret = cache_block_group(root, cache);
- if (ret) {
+ if (ret)
goto out;
- }
- last = max(search_start, cache->key.objectid);
- if (!block_group_bits(cache, data) || cache->ro)
+ if (cache->ro || !block_group_bits(cache, data))
goto new_group;
- spin_lock_irq(&free_space_cache->lock);
- state = find_first_extent_bit_state(free_space_cache, last, EXTENT_DIRTY);
- while(1) {
- if (!state) {
- if (!cache_miss)
- cache_miss = last;
- spin_unlock_irq(&free_space_cache->lock);
- goto new_group;
- }
-
- start = max(last, state->start);
- last = state->end + 1;
- if (last - start < num) {
- do {
- state = extent_state_next(state);
- } while(state && !(state->state & EXTENT_DIRTY));
- continue;
- }
- spin_unlock_irq(&free_space_cache->lock);
- if (cache->ro) {
- goto new_group;
- }
- if (start + num > cache->key.objectid + cache->key.offset)
- goto new_group;
- if (!block_group_bits(cache, data)) {
- printk("block group bits don't match %Lu %d\n", cache->flags, data);
- }
- *start_ret = start;
+ info = btrfs_find_free_space(cache, last, num);
+ if (info) {
+ *start_ret = info->offset;
return 0;
}
-out:
- cache = btrfs_lookup_block_group(root->fs_info, search_start);
- if (!cache) {
- printk("Unable to find block group for %Lu\n", search_start);
- WARN_ON(1);
- }
- return -ENOSPC;
new_group:
last = cache->key.objectid + cache->key.offset;
-wrapped:
+
cache = btrfs_lookup_first_block_group(root->fs_info, last);
- if (!cache || cache->key.objectid >= total_fs_bytes) {
-no_cache:
- if (!wrapped) {
- wrapped = 1;
- last = search_start;
- goto wrapped;
- }
+ if (!cache || cache->key.objectid >= total_fs_bytes)
goto out;
- }
- if (cache_miss && !cache->cached) {
- cache_block_group(root, cache);
- last = cache_miss;
- cache = btrfs_lookup_first_block_group(root->fs_info, last);
- }
- cache_miss = 0;
- cache = btrfs_find_block_group(root, cache, last, data, 0);
- if (!cache)
- goto no_cache;
+
*cache_ret = cache;
goto again;
+
+out:
+ return -ENOSPC;
}
static u64 div_factor(u64 num, int factor)
return num;
}
-static int block_group_state_bits(u64 flags)
+static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info,
+ u64 flags)
{
- int bits = 0;
- if (flags & BTRFS_BLOCK_GROUP_DATA)
- bits |= BLOCK_GROUP_DATA;
- if (flags & BTRFS_BLOCK_GROUP_METADATA)
- bits |= BLOCK_GROUP_METADATA;
- if (flags & BTRFS_BLOCK_GROUP_SYSTEM)
- bits |= BLOCK_GROUP_SYSTEM;
- return bits;
+ struct list_head *head = &info->space_info;
+ struct list_head *cur;
+ struct btrfs_space_info *found;
+ list_for_each(cur, head) {
+ found = list_entry(cur, struct btrfs_space_info, list);
+ if (found->flags == flags)
+ return found;
+ }
+ return NULL;
+
}
-struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
- struct btrfs_block_group_cache
- *hint, u64 search_start,
- int data, int owner)
+static struct btrfs_block_group_cache *
+__btrfs_find_block_group(struct btrfs_root *root,
+ struct btrfs_block_group_cache *hint,
+ u64 search_start, int data, int owner)
{
struct btrfs_block_group_cache *cache;
- struct extent_io_tree *block_group_cache;
struct btrfs_block_group_cache *found_group = NULL;
struct btrfs_fs_info *info = root->fs_info;
+ struct btrfs_space_info *sinfo;
u64 used;
u64 last = 0;
- u64 start;
- u64 end;
u64 free_check;
- u64 ptr;
- int bit;
- int ret;
int full_search = 0;
int factor = 10;
int wrapped = 0;
- block_group_cache = &info->block_group_cache;
-
if (data & BTRFS_BLOCK_GROUP_METADATA)
factor = 9;
- bit = block_group_state_bits(data);
-
if (search_start) {
struct btrfs_block_group_cache *shint;
shint = btrfs_lookup_first_block_group(info, search_start);
if (shint && block_group_bits(shint, data) && !shint->ro) {
+ spin_lock(&shint->lock);
used = btrfs_block_group_used(&shint->item);
if (used + shint->pinned <
div_factor(shint->key.offset, factor)) {
+ spin_unlock(&shint->lock);
return shint;
}
+ spin_unlock(&shint->lock);
}
}
if (hint && !hint->ro && block_group_bits(hint, data)) {
+ spin_lock(&hint->lock);
used = btrfs_block_group_used(&hint->item);
if (used + hint->pinned <
div_factor(hint->key.offset, factor)) {
+ spin_unlock(&hint->lock);
return hint;
}
+ spin_unlock(&hint->lock);
last = hint->key.objectid + hint->key.offset;
} else {
if (hint)
else
last = search_start;
}
+ sinfo = __find_space_info(root->fs_info, data);
+ if (!sinfo)
+ goto found;
again:
while(1) {
- ret = find_first_extent_bit(block_group_cache, last,
- &start, &end, bit);
- if (ret)
- break;
+ struct list_head *l;
- ret = get_state_private(block_group_cache, start, &ptr);
- if (ret) {
- last = end + 1;
- continue;
+ cache = NULL;
+
+ spin_lock(&sinfo->lock);
+ list_for_each(l, &sinfo->block_groups) {
+ struct btrfs_block_group_cache *entry;
+ entry = list_entry(l, struct btrfs_block_group_cache,
+ list);
+ if ((entry->key.objectid >= last) &&
+ (!cache || (entry->key.objectid <
+ cache->key.objectid)))
+ cache = entry;
}
+ spin_unlock(&sinfo->lock);
- cache = (struct btrfs_block_group_cache *)(unsigned long)ptr;
+ if (!cache)
+ break;
+
+ spin_lock(&cache->lock);
last = cache->key.objectid + cache->key.offset;
used = btrfs_block_group_used(&cache->item);
free_check = div_factor(cache->key.offset, factor);
if (used + cache->pinned < free_check) {
found_group = cache;
+ spin_unlock(&cache->lock);
goto found;
}
}
+ spin_unlock(&cache->lock);
cond_resched();
}
if (!wrapped) {
return found_group;
}
-static u64 hash_extent_ref(u64 root_objectid, u64 ref_generation,
- u64 owner, u64 owner_offset)
-{
- u32 high_crc = ~(u32)0;
- u32 low_crc = ~(u32)0;
- __le64 lenum;
- lenum = cpu_to_le64(root_objectid);
- high_crc = btrfs_crc32c(high_crc, &lenum, sizeof(lenum));
- lenum = cpu_to_le64(ref_generation);
- low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum));
- if (owner >= BTRFS_FIRST_FREE_OBJECTID) {
- lenum = cpu_to_le64(owner);
- low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum));
- lenum = cpu_to_le64(owner_offset);
- low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum));
- }
- return ((u64)high_crc << 32) | (u64)low_crc;
-}
-
-static int match_extent_ref(struct extent_buffer *leaf,
- struct btrfs_extent_ref *disk_ref,
- struct btrfs_extent_ref *cpu_ref)
+struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
+ struct btrfs_block_group_cache
+ *hint, u64 search_start,
+ int data, int owner)
{
- int ret;
- int len;
- if (cpu_ref->objectid)
- len = sizeof(*cpu_ref);
- else
- len = 2 * sizeof(u64);
- ret = memcmp_extent_buffer(leaf, cpu_ref, (unsigned long)disk_ref,
- len);
- return ret == 0;
+ struct btrfs_block_group_cache *ret;
+ ret = __btrfs_find_block_group(root, hint, search_start, data, owner);
+ return ret;
}
-static int noinline lookup_extent_backref(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct btrfs_path *path, u64 bytenr,
- u64 root_objectid,
- u64 ref_generation, u64 owner,
- u64 owner_offset, int del)
+/* simple helper to search for an existing extent at a given offset */
+int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len)
{
- u64 hash;
- struct btrfs_key key;
- struct btrfs_key found_key;
- struct btrfs_extent_ref ref;
- struct extent_buffer *leaf;
- struct btrfs_extent_ref *disk_ref;
int ret;
- int ret2;
-
- btrfs_set_stack_ref_root(&ref, root_objectid);
- btrfs_set_stack_ref_generation(&ref, ref_generation);
- btrfs_set_stack_ref_objectid(&ref, owner);
- btrfs_set_stack_ref_offset(&ref, owner_offset);
-
- hash = hash_extent_ref(root_objectid, ref_generation, owner,
- owner_offset);
- key.offset = hash;
- key.objectid = bytenr;
- key.type = BTRFS_EXTENT_REF_KEY;
+ struct btrfs_key key;
+ struct btrfs_path *path;
- while (1) {
- ret = btrfs_search_slot(trans, root, &key, path,
- del ? -1 : 0, del);
- if (ret < 0)
- goto out;
- leaf = path->nodes[0];
- if (ret != 0) {
- u32 nritems = btrfs_header_nritems(leaf);
- if (path->slots[0] >= nritems) {
- ret2 = btrfs_next_leaf(root, path);
- if (ret2)
- goto out;
- leaf = path->nodes[0];
- }
- btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
- if (found_key.objectid != bytenr ||
- found_key.type != BTRFS_EXTENT_REF_KEY)
- goto out;
- key.offset = found_key.offset;
- if (del) {
- btrfs_release_path(root, path);
- continue;
- }
- }
- disk_ref = btrfs_item_ptr(path->nodes[0],
- path->slots[0],
- struct btrfs_extent_ref);
- if (match_extent_ref(path->nodes[0], disk_ref, &ref)) {
- ret = 0;
- goto out;
- }
- btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
- key.offset = found_key.offset + 1;
- btrfs_release_path(root, path);
- }
-out:
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ maybe_lock_mutex(root);
+ key.objectid = start;
+ key.offset = len;
+ btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
+ ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path,
+ 0, 0);
+ maybe_unlock_mutex(root);
+ btrfs_free_path(path);
return ret;
}
* File extents can be referenced by:
*
* - multiple snapshots, subvolumes, or different generations in one subvol
- * - different files inside a single subvolume (in theory, not implemented yet)
+ * - different files inside a single subvolume
* - different offsets inside a file (bookend extents in file.c)
*
* The extent ref structure has fields for:
* - Generation number of the tree holding the reference
* - objectid of the file holding the reference
* - offset in the file corresponding to the key holding the reference
+ * - number of references holding by parent node (alway 1 for tree blocks)
+ *
+ * Btree leaf may hold multiple references to a file extent. In most cases,
+ * these references are from same file and the corresponding offsets inside
+ * the file are close together. So inode objectid and offset in file are
+ * just hints, they provide hints about where in the btree the references
+ * can be found and when we can stop searching.
*
* When a file extent is allocated the fields are filled in:
- * (root_key.objectid, trans->transid, inode objectid, offset in file)
+ * (root_key.objectid, trans->transid, inode objectid, offset in file, 1)
*
* When a leaf is cow'd new references are added for every file extent found
- * in the leaf. It looks the same as the create case, but trans->transid
- * will be different when the block is cow'd.
+ * in the leaf. It looks similar to the create case, but trans->transid will
+ * be different when the block is cow'd.
*
- * (root_key.objectid, trans->transid, inode objectid, offset in file)
+ * (root_key.objectid, trans->transid, inode objectid, offset in file,
+ * number of references in the leaf)
*
- * When a file extent is removed either during snapshot deletion or file
- * truncation, the corresponding back reference is found
- * by searching for:
+ * Because inode objectid and offset in file are just hints, they are not
+ * used when backrefs are deleted. When a file extent is removed either
+ * during snapshot deletion or file truncation, we find the corresponding
+ * back back reference and check the following fields.
*
- * (btrfs_header_owner(leaf), btrfs_header_generation(leaf),
- * inode objectid, offset in file)
+ * (btrfs_header_owner(leaf), btrfs_header_generation(leaf))
*
* Btree extents can be referenced by:
*
* - Different subvolumes
* - Different generations of the same subvolume
*
- * Storing sufficient information for a full reverse mapping of a btree
- * block would require storing the lowest key of the block in the backref,
- * and it would require updating that lowest key either before write out or
- * every time it changed. Instead, the objectid of the lowest key is stored
- * along with the level of the tree block. This provides a hint
- * about where in the btree the block can be found. Searches through the
- * btree only need to look for a pointer to that block, so they stop one
- * level higher than the level recorded in the backref.
- *
- * Some btrees do not do reference counting on their extents. These
- * include the extent tree and the tree of tree roots. Backrefs for these
- * trees always have a generation of zero.
- *
* When a tree block is created, back references are inserted:
*
- * (root->root_key.objectid, trans->transid or zero, level, lowest_key_objectid)
+ * (root->root_key.objectid, trans->transid, level, 0, 1)
*
- * When a tree block is cow'd in a reference counted root,
- * new back references are added for all the blocks it points to.
- * These are of the form (trans->transid will have increased since creation):
+ * When a tree block is cow'd, new back references are added for all the
+ * blocks it points to. If the tree block isn't in reference counted root,
+ * the old back references are removed. These new back references are of
+ * the form (trans->transid will have increased since creation):
*
- * (root->root_key.objectid, trans->transid, level, lowest_key_objectid)
+ * (root->root_key.objectid, trans->transid, level, 0, 1)
*
- * Because the lowest_key_objectid and the level are just hints
- * they are not used when backrefs are deleted. When a backref is deleted:
+ * When a backref is in deleting, the following fields are checked:
*
* if backref was for a tree root:
- * root_objectid = root->root_key.objectid
+ * (btrfs_header_owner(itself), btrfs_header_generation(itself))
* else
- * root_objectid = btrfs_header_owner(parent)
- *
- * (root_objectid, btrfs_header_generation(parent) or zero, 0, 0)
+ * (btrfs_header_owner(parent), btrfs_header_generation(parent))
*
- * Back Reference Key hashing:
+ * Back Reference Key composing:
*
- * Back references have four fields, each 64 bits long. Unfortunately,
- * This is hashed into a single 64 bit number and placed into the key offset.
- * The key objectid corresponds to the first byte in the extent, and the
- * key type is set to BTRFS_EXTENT_REF_KEY
+ * The key objectid corresponds to the first byte in the extent, the key
+ * type is set to BTRFS_EXTENT_REF_KEY, and the key offset is the first
+ * byte of parent extent. If a extent is tree root, the key offset is set
+ * to the key objectid.
*/
-int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct btrfs_path *path, u64 bytenr,
- u64 root_objectid, u64 ref_generation,
- u64 owner, u64 owner_offset)
+
+static int noinline lookup_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, int del)
{
- u64 hash;
struct btrfs_key key;
- struct btrfs_extent_ref ref;
- struct btrfs_extent_ref *disk_ref;
+ struct btrfs_extent_ref *ref;
+ struct extent_buffer *leaf;
int ret;
- btrfs_set_stack_ref_root(&ref, root_objectid);
- btrfs_set_stack_ref_generation(&ref, ref_generation);
- btrfs_set_stack_ref_objectid(&ref, owner);
- btrfs_set_stack_ref_offset(&ref, owner_offset);
+ key.objectid = bytenr;
+ key.type = BTRFS_EXTENT_REF_KEY;
+ key.offset = parent;
+
+ ret = btrfs_search_slot(trans, root, &key, path, del ? -1 : 0, 1);
+ if (ret < 0)
+ goto out;
+ if (ret > 0) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+ leaf = path->nodes[0];
+ ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref);
+ if (btrfs_ref_root(leaf, ref) != ref_root ||
+ btrfs_ref_generation(leaf, ref) != ref_generation) {
+ ret = -EIO;
+ WARN_ON(1);
+ goto out;
+ }
+ ret = 0;
+out:
+ return ret;
+}
+
+static int noinline 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_offset)
+{
+ struct btrfs_key key;
+ struct extent_buffer *leaf;
+ struct btrfs_extent_ref *ref;
+ u32 num_refs;
+ int ret;
- hash = hash_extent_ref(root_objectid, ref_generation, owner,
- owner_offset);
- key.offset = hash;
key.objectid = bytenr;
key.type = BTRFS_EXTENT_REF_KEY;
+ key.offset = parent;
- ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(ref));
- while (ret == -EEXIST) {
- disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
- struct btrfs_extent_ref);
- if (match_extent_ref(path->nodes[0], disk_ref, &ref))
+ ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*ref));
+ if (ret == 0) {
+ leaf = path->nodes[0];
+ ref = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_extent_ref);
+ 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_offset(leaf, ref, owner_offset);
+ btrfs_set_ref_num_refs(leaf, ref, 1);
+ } 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],
+ struct btrfs_extent_ref);
+ if (btrfs_ref_root(leaf, ref) != ref_root ||
+ btrfs_ref_generation(leaf, ref) != ref_generation) {
+ ret = -EIO;
+ WARN_ON(1);
goto out;
- key.offset++;
- btrfs_release_path(root, path);
- ret = btrfs_insert_empty_item(trans, root, path, &key,
- sizeof(ref));
- }
- if (ret)
+ }
+
+ num_refs = btrfs_ref_num_refs(leaf, ref);
+ BUG_ON(num_refs == 0);
+ btrfs_set_ref_num_refs(leaf, ref, num_refs + 1);
+
+ existing_owner = btrfs_ref_objectid(leaf, ref);
+ if (existing_owner == owner_objectid &&
+ btrfs_ref_offset(leaf, ref) > owner_offset) {
+ btrfs_set_ref_offset(leaf, ref, owner_offset);
+ } else if (existing_owner != owner_objectid &&
+ existing_owner != BTRFS_MULTIPLE_OBJECTIDS) {
+ btrfs_set_ref_objectid(leaf, ref,
+ BTRFS_MULTIPLE_OBJECTIDS);
+ btrfs_set_ref_offset(leaf, ref, 0);
+ }
+ ret = 0;
+ } else {
goto out;
- disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
- struct btrfs_extent_ref);
- write_extent_buffer(path->nodes[0], &ref, (unsigned long)disk_ref,
- sizeof(ref));
+ }
btrfs_mark_buffer_dirty(path->nodes[0]);
out:
btrfs_release_path(root, path);
return ret;
}
-int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- u64 bytenr, u64 num_bytes,
- u64 root_objectid, u64 ref_generation,
- u64 owner, u64 owner_offset)
+static int noinline remove_extent_backref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path)
+{
+ struct extent_buffer *leaf;
+ struct btrfs_extent_ref *ref;
+ u32 num_refs;
+ int ret = 0;
+
+ 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;
+ if (num_refs == 0) {
+ ret = btrfs_del_item(trans, root, path);
+ } else {
+ btrfs_set_ref_num_refs(leaf, ref, num_refs);
+ btrfs_mark_buffer_dirty(leaf);
+ }
+ btrfs_release_path(root, path);
+ return ret;
+}
+
+static int __btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 bytenr,
+ u64 orig_parent, u64 parent,
+ u64 orig_root, u64 ref_root,
+ u64 orig_generation, u64 ref_generation,
+ u64 owner_objectid, u64 owner_offset)
+{
+ int ret;
+ struct btrfs_root *extent_root = root->fs_info->extent_root;
+ struct btrfs_path *path;
+
+ 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);
+ if (test_range_bit(&root->fs_info->extent_ins, bytenr,
+ bytenr + num_bytes - 1, EXTENT_LOCKED, 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;
+
+ set_extent_bits(&root->fs_info->extent_ins,
+ bytenr, bytenr + num_bytes - 1,
+ EXTENT_LOCKED, GFP_NOFS);
+ set_state_private(&root->fs_info->extent_ins,
+ bytenr, (unsigned long)extent_op);
+ }
+ 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, 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, owner_offset);
+ BUG_ON(ret);
+ finish_current_insert(trans, extent_root);
+ del_pending_extents(trans, extent_root);
+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 ref_root, u64 ref_generation,
+ u64 owner_objectid, u64 owner_offset)
+{
+ int ret;
+ if (ref_root == BTRFS_TREE_LOG_OBJECTID &&
+ owner_objectid < BTRFS_FIRST_FREE_OBJECTID)
+ return 0;
+ maybe_lock_mutex(root);
+ ret = __btrfs_update_extent_ref(trans, root, bytenr, orig_parent,
+ parent, ref_root, ref_root,
+ ref_generation, ref_generation,
+ owner_objectid, owner_offset);
+ maybe_unlock_mutex(root);
+ return ret;
+}
+
+static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 bytenr,
+ u64 orig_parent, u64 parent,
+ u64 orig_root, u64 ref_root,
+ u64 orig_generation, u64 ref_generation,
+ u64 owner_objectid, u64 owner_offset)
{
struct btrfs_path *path;
int ret;
struct btrfs_extent_item *item;
u32 refs;
- WARN_ON(num_bytes < root->sectorsize);
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
path->reada = 1;
key.objectid = bytenr;
- btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
- key.offset = num_bytes;
+ key.type = BTRFS_EXTENT_ITEM_KEY;
+ key.offset = (u64)-1;
+
ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path,
0, 1);
if (ret < 0)
return ret;
- if (ret != 0) {
- BUG();
- }
- BUG_ON(ret != 0);
+ BUG_ON(ret == 0 || path->slots[0] == 0);
+
+ path->slots[0]--;
l = path->nodes[0];
+
+ btrfs_item_key_to_cpu(l, &key, path->slots[0]);
+ BUG_ON(key.objectid != bytenr);
+ 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_release_path(root->fs_info->extent_root, path);
path->reada = 1;
- ret = btrfs_insert_extent_backref(trans, root->fs_info->extent_root,
- path, bytenr, root_objectid,
- ref_generation, owner, owner_offset);
+ ret = insert_extent_backref(trans, root->fs_info->extent_root,
+ path, bytenr, parent,
+ ref_root, ref_generation,
+ owner_objectid, owner_offset);
BUG_ON(ret);
finish_current_insert(trans, root->fs_info->extent_root);
del_pending_extents(trans, root->fs_info->extent_root);
return 0;
}
+int btrfs_inc_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, u64 owner_offset)
+{
+ int ret;
+ if (ref_root == BTRFS_TREE_LOG_OBJECTID &&
+ owner_objectid < BTRFS_FIRST_FREE_OBJECTID)
+ return 0;
+ maybe_lock_mutex(root);
+ ret = __btrfs_inc_extent_ref(trans, root, bytenr, 0, parent,
+ 0, ref_root, 0, ref_generation,
+ owner_objectid, owner_offset);
+ maybe_unlock_mutex(root);
+ return ret;
+}
+
int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
return 0;
}
-static int lookup_extent_ref(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, u64 bytenr,
- u64 num_bytes, u32 *refs)
+int btrfs_lookup_extent_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 bytenr,
+ u64 num_bytes, u32 *refs)
{
struct btrfs_path *path;
int ret;
return 0;
}
-u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
- struct btrfs_path *count_path,
- u64 expected_owner,
- u64 first_extent)
+static int get_reference_status(struct btrfs_root *root, u64 bytenr,
+ u64 parent_gen, u64 ref_objectid,
+ u64 *min_generation, u32 *ref_count)
{
struct btrfs_root *extent_root = root->fs_info->extent_root;
struct btrfs_path *path;
- u64 bytenr;
- u64 found_objectid;
- u64 found_owner;
+ struct extent_buffer *leaf;
+ struct btrfs_extent_ref *ref_item;
+ struct btrfs_key key;
+ struct btrfs_key found_key;
u64 root_objectid = root->root_key.objectid;
- u32 total_count = 0;
- u32 extent_refs;
- u32 cur_count;
+ u64 ref_generation;
u32 nritems;
int ret;
- struct btrfs_key key;
- struct btrfs_key found_key;
- struct extent_buffer *l;
- struct btrfs_extent_item *item;
- struct btrfs_extent_ref *ref_item;
- int level = -1;
-
- path = btrfs_alloc_path();
-again:
- if (level == -1)
- bytenr = first_extent;
- else
- bytenr = count_path->nodes[level]->start;
- cur_count = 0;
key.objectid = bytenr;
- key.offset = 0;
+ key.offset = (u64)-1;
+ key.type = BTRFS_EXTENT_ITEM_KEY;
- btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
+ path = btrfs_alloc_path();
+ mutex_lock(&root->fs_info->alloc_mutex);
ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
if (ret < 0)
goto out;
BUG_ON(ret == 0);
+ if (ret < 0 || path->slots[0] == 0)
+ goto out;
- l = path->nodes[0];
- btrfs_item_key_to_cpu(l, &found_key, path->slots[0]);
+ path->slots[0]--;
+ leaf = path->nodes[0];
+ btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
if (found_key.objectid != bytenr ||
found_key.type != BTRFS_EXTENT_ITEM_KEY) {
+ ret = 1;
goto out;
}
- item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item);
- extent_refs = btrfs_extent_refs(l, item);
+ *ref_count = 0;
+ *min_generation = (u64)-1;
+
while (1) {
- l = path->nodes[0];
- nritems = btrfs_header_nritems(l);
+ leaf = path->nodes[0];
+ nritems = btrfs_header_nritems(leaf);
if (path->slots[0] >= nritems) {
ret = btrfs_next_leaf(extent_root, path);
+ if (ret < 0)
+ goto out;
if (ret == 0)
continue;
break;
}
- btrfs_item_key_to_cpu(l, &found_key, path->slots[0]);
+ btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
if (found_key.objectid != bytenr)
break;
continue;
}
- cur_count++;
- ref_item = btrfs_item_ptr(l, path->slots[0],
+ ref_item = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_extent_ref);
- found_objectid = btrfs_ref_root(l, ref_item);
-
- if (found_objectid != root_objectid) {
- total_count = 2;
- goto out;
- }
- if (level == -1) {
- found_owner = btrfs_ref_objectid(l, ref_item);
- if (found_owner != expected_owner) {
- total_count = 2;
- goto out;
- }
- /*
- * nasty. we don't count a reference held by
- * the running transaction. This allows nodatacow
- * to avoid cow most of the time
- */
- if (found_owner >= BTRFS_FIRST_FREE_OBJECTID &&
- btrfs_ref_generation(l, ref_item) ==
- root->fs_info->generation) {
- extent_refs--;
- }
+ ref_generation = btrfs_ref_generation(leaf, ref_item);
+ /*
+ * For (parent_gen > 0 && parent_gen > ref_generation):
+ *
+ * we reach here through the oldest root, therefore
+ * all other reference from same snapshot should have
+ * a larger generation.
+ */
+ if ((root_objectid != btrfs_ref_root(leaf, ref_item)) ||
+ (parent_gen > 0 && parent_gen > ref_generation) ||
+ (ref_objectid >= BTRFS_FIRST_FREE_OBJECTID &&
+ ref_objectid != btrfs_ref_objectid(leaf, ref_item))) {
+ *ref_count = 2;
+ break;
}
- total_count = 1;
+
+ *ref_count = 1;
+ if (*min_generation > ref_generation)
+ *min_generation = ref_generation;
+
path->slots[0]++;
}
- /*
- * if there is more than one reference against a data extent,
- * we have to assume the other ref is another snapshot
- */
- if (level == -1 && extent_refs > 1) {
- total_count = 2;
+ ret = 0;
+out:
+ mutex_unlock(&root->fs_info->alloc_mutex);
+ btrfs_free_path(path);
+ return ret;
+}
+
+int btrfs_cross_ref_exists(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_key *key, u64 bytenr)
+{
+ struct btrfs_root *old_root;
+ struct btrfs_path *path = NULL;
+ struct extent_buffer *eb;
+ struct btrfs_file_extent_item *item;
+ u64 ref_generation;
+ u64 min_generation;
+ u64 extent_start;
+ u32 ref_count;
+ int level;
+ int ret;
+
+ BUG_ON(trans == NULL);
+ BUG_ON(key->type != BTRFS_EXTENT_DATA_KEY);
+ ret = get_reference_status(root, bytenr, 0, key->objectid,
+ &min_generation, &ref_count);
+ if (ret)
+ return ret;
+
+ if (ref_count != 1)
+ return 1;
+
+ old_root = root->dirty_root->root;
+ ref_generation = old_root->root_key.offset;
+
+ /* all references are created in running transaction */
+ if (min_generation > ref_generation) {
+ ret = 0;
goto out;
}
- if (cur_count == 0) {
- total_count = 0;
+
+ path = btrfs_alloc_path();
+ if (!path) {
+ ret = -ENOMEM;
goto out;
}
- if (level >= 0 && root->node == count_path->nodes[level])
+
+ path->skip_locking = 1;
+ /* if no item found, the extent is referenced by other snapshot */
+ ret = btrfs_search_slot(NULL, old_root, key, path, 0, 0);
+ if (ret)
goto out;
- level++;
- btrfs_release_path(root, path);
- goto again;
+ eb = path->nodes[0];
+ item = btrfs_item_ptr(eb, path->slots[0],
+ struct btrfs_file_extent_item);
+ if (btrfs_file_extent_type(eb, item) != BTRFS_FILE_EXTENT_REG ||
+ btrfs_file_extent_disk_bytenr(eb, item) != bytenr) {
+ ret = 1;
+ goto out;
+ }
+
+ for (level = BTRFS_MAX_LEVEL - 1; level >= -1; level--) {
+ if (level >= 0) {
+ eb = path->nodes[level];
+ if (!eb)
+ continue;
+ extent_start = eb->start;
+ } else
+ extent_start = bytenr;
+
+ ret = get_reference_status(root, extent_start, ref_generation,
+ 0, &min_generation, &ref_count);
+ if (ret)
+ goto out;
+
+ if (ref_count != 1) {
+ ret = 1;
+ goto out;
+ }
+ if (level >= 0)
+ ref_generation = btrfs_header_generation(eb);
+ }
+ ret = 0;
out:
- btrfs_free_path(path);
- return total_count;
+ if (path)
+ btrfs_free_path(path);
+ return ret;
}
-int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, u64 owner_objectid)
+
+int btrfs_cache_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
+ struct extent_buffer *buf, u32 nr_extents)
{
- u64 generation;
- u64 key_objectid;
- u64 level;
u32 nritems;
- struct btrfs_disk_key disk_key;
+ struct btrfs_key key;
+ struct btrfs_file_extent_item *fi;
+ int i;
+ int level;
+ int ret = 0;
- level = btrfs_header_level(root->node);
- generation = trans->transid;
- nritems = btrfs_header_nritems(root->node);
- if (nritems > 0) {
- if (level == 0)
- btrfs_item_key(root->node, &disk_key, 0);
- else
- btrfs_node_key(root->node, &disk_key, 0);
- key_objectid = btrfs_disk_key_objectid(&disk_key);
- } else {
- key_objectid = 0;
+ if (!root->ref_cows)
+ return 0;
+
+ level = btrfs_header_level(buf);
+ nritems = btrfs_header_nritems(buf);
+
+ if (level == 0) {
+ struct btrfs_leaf_ref *ref;
+ struct btrfs_extent_info *info;
+
+ ref = btrfs_alloc_leaf_ref(root, nr_extents);
+ if (!ref) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ref->root_gen = root->root_key.offset;
+ ref->bytenr = buf->start;
+ ref->owner = btrfs_header_owner(buf);
+ ref->generation = btrfs_header_generation(buf);
+ ref->nritems = nr_extents;
+ info = ref->extents;
+
+ for (i = 0; nr_extents > 0 && i < nritems; i++) {
+ u64 disk_bytenr;
+ 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;
+ disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi);
+ if (disk_bytenr == 0)
+ continue;
+
+ info->bytenr = disk_bytenr;
+ info->num_bytes =
+ btrfs_file_extent_disk_num_bytes(buf, fi);
+ info->objectid = key.objectid;
+ info->offset = key.offset;
+ info++;
+ }
+
+ BUG_ON(!root->ref_tree);
+ ret = btrfs_add_leaf_ref(root, ref);
+ WARN_ON(ret);
+ btrfs_free_leaf_ref(root, ref);
}
- return btrfs_inc_extent_ref(trans, root, root->node->start,
- root->node->len, owner_objectid,
- generation, level, key_objectid);
+out:
+ return ret;
}
int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
- struct extent_buffer *buf)
+ 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;
u32 nritems;
+ u32 nr_file_extents = 0;
struct btrfs_key key;
struct btrfs_file_extent_item *fi;
int i;
int level;
- int ret;
- int faili;
+ int ret = 0;
+ int faili = 0;
+ int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *,
+ u64, u64, u64, u64, u64, u64, u64, u64, u64);
- if (!root->ref_cows)
- return 0;
+ ref_root = btrfs_header_owner(buf);
+ ref_generation = btrfs_header_generation(buf);
+ orig_root = btrfs_header_owner(orig_buf);
+ orig_generation = btrfs_header_generation(orig_buf);
- level = btrfs_header_level(buf);
nritems = btrfs_header_nritems(buf);
+ level = btrfs_header_level(buf);
+
+ if (root->ref_cows) {
+ process_func = __btrfs_inc_extent_ref;
+ } else {
+ if (level == 0 &&
+ root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID)
+ goto out;
+ if (level != 0 &&
+ root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID)
+ goto out;
+ process_func = __btrfs_update_extent_ref;
+ }
+
for (i = 0; i < nritems; i++) {
+ cond_resched();
if (level == 0) {
- u64 disk_bytenr;
btrfs_item_key_to_cpu(buf, &key, i);
if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
continue;
if (btrfs_file_extent_type(buf, fi) ==
BTRFS_FILE_EXTENT_INLINE)
continue;
- disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi);
- if (disk_bytenr == 0)
+ bytenr = btrfs_file_extent_disk_bytenr(buf, fi);
+ if (bytenr == 0)
continue;
- ret = btrfs_inc_extent_ref(trans, root, disk_bytenr,
- btrfs_file_extent_disk_num_bytes(buf, fi),
- root->root_key.objectid, trans->transid,
- key.objectid, key.offset);
+
+ nr_file_extents++;
+
+ maybe_lock_mutex(root);
+ ret = process_func(trans, root, bytenr,
+ orig_buf->start, buf->start,
+ orig_root, ref_root,
+ orig_generation, ref_generation,
+ key.objectid, key.offset);
+ maybe_unlock_mutex(root);
+
if (ret) {
faili = i;
+ WARN_ON(1);
goto fail;
}
} else {
bytenr = btrfs_node_blockptr(buf, i);
- btrfs_node_key_to_cpu(buf, &key, i);
- ret = btrfs_inc_extent_ref(trans, root, bytenr,
- btrfs_level_size(root, level - 1),
- root->root_key.objectid,
- trans->transid,
- level - 1, key.objectid);
+ maybe_lock_mutex(root);
+ ret = process_func(trans, root, bytenr,
+ orig_buf->start, buf->start,
+ orig_root, ref_root,
+ orig_generation, ref_generation,
+ level - 1, 0);
+ maybe_unlock_mutex(root);
if (ret) {
faili = i;
+ WARN_ON(1);
goto fail;
}
}
}
+out:
+ if (nr_extents) {
+ if (level == 0)
+ *nr_extents = nr_file_extents;
+ else
+ *nr_extents = nritems;
+ }
return 0;
fail:
WARN_ON(1);
-#if 0
- for (i =0; i < faili; i++) {
+ return ret;
+}
+
+int btrfs_update_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct extent_buffer *orig_buf,
+ struct extent_buffer *buf, int start_slot, int nr)
+
+{
+ u64 bytenr;
+ u64 ref_root;
+ u64 orig_root;
+ u64 ref_generation;
+ u64 orig_generation;
+ struct btrfs_key key;
+ struct btrfs_file_extent_item *fi;
+ int i;
+ int ret;
+ int slot;
+ int level;
+
+ BUG_ON(start_slot < 0);
+ BUG_ON(start_slot + nr > btrfs_header_nritems(buf));
+
+ ref_root = btrfs_header_owner(buf);
+ ref_generation = btrfs_header_generation(buf);
+ orig_root = btrfs_header_owner(orig_buf);
+ orig_generation = btrfs_header_generation(orig_buf);
+ level = btrfs_header_level(buf);
+
+ if (!root->ref_cows) {
+ if (level == 0 &&
+ root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID)
+ return 0;
+ if (level != 0 &&
+ root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID)
+ return 0;
+ }
+
+ for (i = 0, slot = start_slot; i < nr; i++, slot++) {
+ cond_resched();
if (level == 0) {
- u64 disk_bytenr;
- btrfs_item_key_to_cpu(buf, &key, i);
+ btrfs_item_key_to_cpu(buf, &key, slot);
if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
continue;
- fi = btrfs_item_ptr(buf, i,
+ fi = btrfs_item_ptr(buf, slot,
struct btrfs_file_extent_item);
if (btrfs_file_extent_type(buf, fi) ==
BTRFS_FILE_EXTENT_INLINE)
continue;
- disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi);
- if (disk_bytenr == 0)
+ bytenr = btrfs_file_extent_disk_bytenr(buf, fi);
+ if (bytenr == 0)
continue;
- err = btrfs_free_extent(trans, root, disk_bytenr,
- btrfs_file_extent_disk_num_bytes(buf,
- fi), 0);
- BUG_ON(err);
+ maybe_lock_mutex(root);
+ ret = __btrfs_update_extent_ref(trans, root, bytenr,
+ orig_buf->start, buf->start,
+ orig_root, ref_root,
+ orig_generation, ref_generation,
+ key.objectid, key.offset);
+ maybe_unlock_mutex(root);
+ if (ret)
+ goto fail;
} else {
- bytenr = btrfs_node_blockptr(buf, i);
- err = btrfs_free_extent(trans, root, bytenr,
- btrfs_level_size(root, level - 1), 0);
- BUG_ON(err);
+ bytenr = btrfs_node_blockptr(buf, slot);
+ maybe_lock_mutex(root);
+ ret = __btrfs_update_extent_ref(trans, root, bytenr,
+ orig_buf->start, buf->start,
+ orig_root, ref_root,
+ orig_generation, ref_generation,
+ level - 1, 0);
+ maybe_unlock_mutex(root);
+ if (ret)
+ goto fail;
}
}
-#endif
- return ret;
+ return 0;
+fail:
+ WARN_ON(1);
+ return -1;
}
static int write_one_cache_group(struct btrfs_trans_handle *trans,
int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
- struct extent_io_tree *block_group_cache;
- struct btrfs_block_group_cache *cache;
- int ret;
+ struct btrfs_block_group_cache *cache, *entry;
+ struct rb_node *n;
int err = 0;
int werr = 0;
struct btrfs_path *path;
u64 last = 0;
- u64 start;
- u64 end;
- u64 ptr;
- block_group_cache = &root->fs_info->block_group_cache;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
+ mutex_lock(&root->fs_info->alloc_mutex);
while(1) {
- ret = find_first_extent_bit(block_group_cache, last,
- &start, &end, BLOCK_GROUP_DIRTY);
- if (ret)
- break;
+ cache = NULL;
+ spin_lock(&root->fs_info->block_group_cache_lock);
+ for (n = rb_first(&root->fs_info->block_group_cache_tree);
+ n; n = rb_next(n)) {
+ entry = rb_entry(n, struct btrfs_block_group_cache,
+ cache_node);
+ if (entry->dirty) {
+ cache = entry;
+ break;
+ }
+ }
+ spin_unlock(&root->fs_info->block_group_cache_lock);
- last = end + 1;
- ret = get_state_private(block_group_cache, start, &ptr);
- if (ret)
+ if (!cache)
break;
- cache = (struct btrfs_block_group_cache *)(unsigned long)ptr;
+
+ last += cache->key.offset;
+
err = write_one_cache_group(trans, root,
path, cache);
/*
werr = err;
continue;
}
- clear_extent_bits(block_group_cache, start, end,
- BLOCK_GROUP_DIRTY, GFP_NOFS);
+
+ cache->dirty = 0;
}
btrfs_free_path(path);
+ mutex_unlock(&root->fs_info->alloc_mutex);
return werr;
}
-static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info,
- u64 flags)
-{
- struct list_head *head = &info->space_info;
- struct list_head *cur;
- struct btrfs_space_info *found;
- list_for_each(cur, head) {
- found = list_entry(cur, struct btrfs_space_info, list);
- if (found->flags == flags)
- return found;
- }
- return NULL;
-
-}
-
static int update_space_info(struct btrfs_fs_info *info, u64 flags,
u64 total_bytes, u64 bytes_used,
struct btrfs_space_info **space_info)
found->total_bytes += total_bytes;
found->bytes_used += bytes_used;
found->full = 0;
- WARN_ON(found->total_bytes < found->bytes_used);
*space_info = found;
return 0;
}
return -ENOMEM;
list_add(&found->list, &info->space_info);
+ INIT_LIST_HEAD(&found->block_groups);
+ spin_lock_init(&found->lock);
found->flags = flags;
found->total_bytes = total_bytes;
found->bytes_used = bytes_used;
u64 thresh;
u64 start;
u64 num_bytes;
- int ret;
+ int ret = 0;
flags = reduce_alloc_profile(extent_root, flags);
space_info->force_alloc = 0;
}
if (space_info->full)
- return 0;
+ goto out;
thresh = div_factor(space_info->total_bytes, 6);
if (!force &&
(space_info->bytes_used + space_info->bytes_pinned + alloc_bytes) <
thresh)
- return 0;
+ goto out;
+ mutex_lock(&extent_root->fs_info->chunk_mutex);
ret = btrfs_alloc_chunk(trans, extent_root, &start, &num_bytes, flags);
if (ret == -ENOSPC) {
printk("space info full %Lu\n", flags);
space_info->full = 1;
- return 0;
+ goto out_unlock;
}
BUG_ON(ret);
BTRFS_FIRST_CHUNK_TREE_OBJECTID, start, num_bytes);
BUG_ON(ret);
- return 0;
+out_unlock:
+ mutex_unlock(&extent_root->fs_info->chunk_mutex);
+out:
+ return ret;
}
static int update_block_group(struct btrfs_trans_handle *trans,
u64 total = num_bytes;
u64 old_val;
u64 byte_in_group;
- u64 start;
- u64 end;
+ WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex));
while(total) {
cache = btrfs_lookup_block_group(info, bytenr);
if (!cache) {
}
byte_in_group = bytenr - cache->key.objectid;
WARN_ON(byte_in_group > cache->key.offset);
- start = cache->key.objectid;
- end = start + cache->key.offset - 1;
- set_extent_bits(&info->block_group_cache, start, end,
- BLOCK_GROUP_DIRTY, GFP_NOFS);
+ spin_lock(&cache->lock);
+ cache->dirty = 1;
old_val = btrfs_block_group_used(&cache->item);
num_bytes = min(total, cache->key.offset - byte_in_group);
if (alloc) {
old_val += num_bytes;
cache->space_info->bytes_used += num_bytes;
+ btrfs_set_block_group_used(&cache->item, old_val);
+ spin_unlock(&cache->lock);
} else {
old_val -= num_bytes;
cache->space_info->bytes_used -= num_bytes;
+ btrfs_set_block_group_used(&cache->item, old_val);
+ spin_unlock(&cache->lock);
if (mark_free) {
- set_extent_dirty(&info->free_space_cache,
- bytenr, bytenr + num_bytes - 1,
- GFP_NOFS);
+ int ret;
+ ret = btrfs_add_free_space(cache, bytenr,
+ num_bytes);
+ if (ret)
+ return -1;
}
}
- btrfs_set_block_group_used(&cache->item, old_val);
total -= num_bytes;
bytenr += num_bytes;
}
return 0;
}
-static u64 first_logical_byte(struct btrfs_root *root, u64 search_start)
-{
- u64 start;
- u64 end;
- int ret;
- ret = find_first_extent_bit(&root->fs_info->block_group_cache,
- search_start, &start, &end,
- BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA |
- BLOCK_GROUP_SYSTEM);
- if (ret)
+static u64 first_logical_byte(struct btrfs_root *root, u64 search_start)
+{
+ struct btrfs_block_group_cache *cache;
+
+ cache = btrfs_lookup_first_block_group(root->fs_info, search_start);
+ if (!cache)
return 0;
- return start;
+
+ return cache->key.objectid;
}
-static int update_pinned_extents(struct btrfs_root *root,
+int btrfs_update_pinned_extents(struct btrfs_root *root,
u64 bytenr, u64 num, int pin)
{
u64 len;
struct btrfs_block_group_cache *cache;
struct btrfs_fs_info *fs_info = root->fs_info;
+ WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex));
if (pin) {
set_extent_dirty(&fs_info->pinned_extents,
bytenr, bytenr + num - 1, GFP_NOFS);
}
if (pin) {
if (cache) {
+ spin_lock(&cache->lock);
cache->pinned += len;
cache->space_info->bytes_pinned += len;
+ spin_unlock(&cache->lock);
}
fs_info->total_pinned += len;
} else {
if (cache) {
+ spin_lock(&cache->lock);
cache->pinned -= len;
cache->space_info->bytes_pinned -= len;
+ spin_unlock(&cache->lock);
}
fs_info->total_pinned -= len;
}
u64 start;
u64 end;
int ret;
- struct extent_io_tree *free_space_cache;
- free_space_cache = &root->fs_info->free_space_cache;
+ struct btrfs_block_group_cache *cache;
+ mutex_lock(&root->fs_info->alloc_mutex);
while(1) {
ret = find_first_extent_bit(unpin, 0, &start, &end,
EXTENT_DIRTY);
if (ret)
break;
- update_pinned_extents(root, start, end + 1 - start, 0);
+ btrfs_update_pinned_extents(root, start, end + 1 - start, 0);
clear_extent_dirty(unpin, start, end, GFP_NOFS);
- set_extent_dirty(free_space_cache, start, end, GFP_NOFS);
+ cache = btrfs_lookup_block_group(root->fs_info, start);
+ if (cache->cached)
+ btrfs_add_free_space(cache, start, end - start + 1);
+ if (need_resched()) {
+ mutex_unlock(&root->fs_info->alloc_mutex);
+ cond_resched();
+ mutex_lock(&root->fs_info->alloc_mutex);
+ }
}
+ mutex_unlock(&root->fs_info->alloc_mutex);
return 0;
}
{
u64 start;
u64 end;
+ u64 priv;
struct btrfs_fs_info *info = extent_root->fs_info;
- struct extent_buffer *eb;
struct btrfs_path *path;
- struct btrfs_key ins;
- struct btrfs_disk_key first;
+ struct btrfs_extent_ref *ref;
+ struct pending_extent_op *extent_op;
+ struct btrfs_key key;
struct btrfs_extent_item extent_item;
int ret;
- int level;
int err = 0;
+ WARN_ON(!mutex_is_locked(&extent_root->fs_info->alloc_mutex));
btrfs_set_stack_extent_refs(&extent_item, 1);
- btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY);
path = btrfs_alloc_path();
while(1) {
if (ret)
break;
- ins.objectid = start;
- ins.offset = end + 1 - start;
- err = btrfs_insert_item(trans, extent_root, &ins,
+ 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) {
+ key.objectid = start;
+ key.offset = end + 1 - start;
+ key.type = BTRFS_EXTENT_ITEM_KEY;
+ err = btrfs_insert_item(trans, extent_root, &key,
&extent_item, sizeof(extent_item));
- clear_extent_bits(&info->extent_ins, start, end, EXTENT_LOCKED,
- GFP_NOFS);
- eb = read_tree_block(extent_root, ins.objectid, ins.offset,
- trans->transid);
- level = btrfs_header_level(eb);
- if (level == 0) {
- btrfs_item_key(eb, &first, 0);
+ BUG_ON(err);
+
+ clear_extent_bits(&info->extent_ins, start, end,
+ EXTENT_LOCKED, GFP_NOFS);
+
+ err = insert_extent_backref(trans, extent_root, path,
+ start, extent_op->parent,
+ extent_root->root_key.objectid,
+ extent_op->generation,
+ extent_op->level, 0);
+ BUG_ON(err);
+ } else if (extent_op->type == PENDING_BACKREF_UPDATE) {
+ err = lookup_extent_backref(trans, extent_root, path,
+ start, extent_op->orig_parent,
+ extent_root->root_key.objectid,
+ extent_op->orig_generation, 0);
+ BUG_ON(err);
+
+ clear_extent_bits(&info->extent_ins, start, end,
+ EXTENT_LOCKED, GFP_NOFS);
+
+ key.objectid = start;
+ key.offset = extent_op->parent;
+ key.type = BTRFS_EXTENT_REF_KEY;
+ err = btrfs_set_item_key_safe(trans, extent_root, path,
+ &key);
+ BUG_ON(err);
+ ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
+ struct btrfs_extent_ref);
+ btrfs_set_ref_generation(path->nodes[0], ref,
+ extent_op->generation);
+ btrfs_mark_buffer_dirty(path->nodes[0]);
+ btrfs_release_path(extent_root, path);
} else {
- btrfs_node_key(eb, &first, 0);
+ BUG_ON(1);
+ }
+ kfree(extent_op);
+
+ if (need_resched()) {
+ mutex_unlock(&extent_root->fs_info->alloc_mutex);
+ cond_resched();
+ mutex_lock(&extent_root->fs_info->alloc_mutex);
}
- err = btrfs_insert_extent_backref(trans, extent_root, path,
- start, extent_root->root_key.objectid,
- 0, level,
- btrfs_disk_key_objectid(&first));
- BUG_ON(err);
- free_extent_buffer(eb);
}
btrfs_free_path(path);
return 0;
}
-static int pin_down_bytes(struct btrfs_root *root, u64 bytenr, u32 num_bytes,
- int pending)
+static int pin_down_bytes(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 bytenr, u64 num_bytes, int is_data)
{
int err = 0;
struct extent_buffer *buf;
- if (!pending) {
- buf = btrfs_find_tree_block(root, bytenr, num_bytes);
- if (buf) {
- if (btrfs_buffer_uptodate(buf, 0)) {
- u64 transid =
- root->fs_info->running_transaction->transid;
- u64 header_transid =
- btrfs_header_generation(buf);
- if (header_transid == transid &&
- !btrfs_header_flag(buf,
- BTRFS_HEADER_FLAG_WRITTEN)) {
- clean_tree_block(NULL, root, buf);
- free_extent_buffer(buf);
- return 1;
- }
- }
+ WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex));
+ if (is_data)
+ goto pinit;
+
+ buf = btrfs_find_tree_block(root, bytenr, num_bytes);
+ if (!buf)
+ goto pinit;
+
+ /* we can reuse a block if it hasn't been written
+ * and it is from this transaction. We can't
+ * reuse anything from the tree log root because
+ * it has tiny sub-transactions.
+ */
+ if (btrfs_buffer_uptodate(buf, 0) &&
+ btrfs_try_tree_lock(buf)) {
+ u64 header_owner = btrfs_header_owner(buf);
+ u64 header_transid = btrfs_header_generation(buf);
+ if (header_owner != BTRFS_TREE_LOG_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);
+ return 1;
}
- update_pinned_extents(root, bytenr, num_bytes, 1);
- } else {
- set_extent_bits(&root->fs_info->pending_del,
- bytenr, bytenr + num_bytes - 1,
- EXTENT_LOCKED, GFP_NOFS);
+ btrfs_tree_unlock(buf);
}
+ free_extent_buffer(buf);
+pinit:
+ btrfs_update_pinned_extents(root, bytenr, num_bytes, 1);
+
BUG_ON(err < 0);
return 0;
}
/*
* remove an extent from the root, returns 0 on success
*/
-static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, u64 bytenr, u64 num_bytes,
+static int __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, u64 owner_offset, int pin,
- int mark_free)
+ u64 owner_objectid, u64 owner_offset,
+ int pin, int mark_free)
{
struct btrfs_path *path;
struct btrfs_key key;
struct btrfs_extent_item *ei;
u32 refs;
+ WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex));
key.objectid = bytenr;
btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
key.offset = num_bytes;
return -ENOMEM;
path->reada = 1;
- ret = lookup_extent_backref(trans, extent_root, path,
- bytenr, root_objectid,
- ref_generation,
- owner_objectid, owner_offset, 1);
+ ret = lookup_extent_backref(trans, extent_root, path, bytenr, parent,
+ root_objectid, ref_generation, 1);
if (ret == 0) {
struct btrfs_key found_key;
extent_slot = path->slots[0];
if (path->slots[0] - extent_slot > 5)
break;
}
- if (!found_extent)
- ret = btrfs_del_item(trans, extent_root, path);
+ if (!found_extent) {
+ 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];
+ }
} else {
btrfs_print_leaf(extent_root, path->nodes[0]);
WARN_ON(1);
root_objectid, ref_generation, owner_objectid,
owner_offset);
}
- if (!found_extent) {
- btrfs_release_path(extent_root, path);
- ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1);
- if (ret < 0)
- return ret;
- BUG_ON(ret);
- extent_slot = path->slots[0];
- }
leaf = path->nodes[0];
ei = btrfs_item_ptr(leaf, extent_slot,
btrfs_mark_buffer_dirty(leaf);
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);
/* 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 = btrfs_del_item(trans, extent_root, path);
+ ret = remove_extent_backref(trans, extent_root, path);
BUG_ON(ret);
/* if refs are 0, we need to setup the path for deletion */
if (refs == 0) {
btrfs_release_path(extent_root, path);
ret = btrfs_search_slot(trans, extent_root, &key, path,
-1, 1);
- if (ret < 0)
- return ret;
BUG_ON(ret);
}
}
if (refs == 0) {
u64 super_used;
u64 root_used;
+#ifdef BIO_RW_DISCARD
+ u64 map_length = num_bytes;
+ struct btrfs_multi_bio *multi = NULL;
+#endif
if (pin) {
- ret = pin_down_bytes(root, bytenr, num_bytes, 0);
+ ret = pin_down_bytes(trans, root, bytenr, num_bytes,
+ owner_objectid >= BTRFS_FIRST_FREE_OBJECTID);
if (ret > 0)
mark_free = 1;
BUG_ON(ret < 0);
}
/* block accounting for super block */
+ spin_lock_irq(&info->delalloc_lock);
super_used = btrfs_super_bytes_used(&info->super_copy);
btrfs_set_super_bytes_used(&info->super_copy,
super_used - num_bytes);
+ spin_unlock_irq(&info->delalloc_lock);
/* block accounting for root item */
root_used = btrfs_root_used(&root->root_item);
root_used - num_bytes);
ret = btrfs_del_items(trans, extent_root, path, path->slots[0],
num_to_del);
- if (ret) {
- return ret;
- }
+ BUG_ON(ret);
ret = update_block_group(trans, root, bytenr, num_bytes, 0,
mark_free);
BUG_ON(ret);
+
+#ifdef BIO_RW_DISCARD
+ /* Tell the block device(s) that the sectors can be discarded */
+ ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
+ bytenr, &map_length, &multi, 0);
+ if (!ret) {
+ struct btrfs_bio_stripe *stripe = multi->stripes;
+ int i;
+
+ if (map_length > num_bytes)
+ map_length = num_bytes;
+
+ for (i = 0; i < multi->num_stripes; i++, stripe++) {
+ blkdev_issue_discard(stripe->dev->bdev,
+ stripe->physical >> 9,
+ map_length >> 9);
+ }
+ kfree(multi);
+ }
+#endif
}
btrfs_free_path(path);
finish_current_insert(trans, extent_root);
{
int ret;
int err = 0;
+ int mark_free = 0;
u64 start;
u64 end;
+ u64 priv;
struct extent_io_tree *pending_del;
- struct extent_io_tree *pinned_extents;
+ struct extent_io_tree *extent_ins;
+ struct pending_extent_op *extent_op;
+ WARN_ON(!mutex_is_locked(&extent_root->fs_info->alloc_mutex));
+ extent_ins = &extent_root->fs_info->extent_ins;
pending_del = &extent_root->fs_info->pending_del;
- pinned_extents = &extent_root->fs_info->pinned_extents;
while(1) {
ret = find_first_extent_bit(pending_del, 0, &start, &end,
EXTENT_LOCKED);
if (ret)
break;
- update_pinned_extents(extent_root, start, end + 1 - start, 1);
+
+ 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_LOCKED,
GFP_NOFS);
- ret = __free_extent(trans, extent_root,
- start, end + 1 - start,
- extent_root->root_key.objectid,
- 0, 0, 0, 0, 0);
+
+ ret = pin_down_bytes(trans, extent_root, start,
+ end + 1 - start, 0);
+ mark_free = ret > 0;
+ if (!test_range_bit(extent_ins, start, end,
+ EXTENT_LOCKED, 0)) {
+free_extent:
+ ret = __free_extent(trans, extent_root,
+ start, end + 1 - start,
+ extent_op->orig_parent,
+ extent_root->root_key.objectid,
+ extent_op->orig_generation,
+ extent_op->level, 0, 0, mark_free);
+ kfree(extent_op);
+ } else {
+ kfree(extent_op);
+ ret = get_state_private(extent_ins, start, &priv);
+ BUG_ON(ret);
+ extent_op = (struct pending_extent_op *)
+ (unsigned long)priv;
+
+ clear_extent_bits(extent_ins, start, end,
+ EXTENT_LOCKED, GFP_NOFS);
+
+ if (extent_op->type == PENDING_BACKREF_UPDATE)
+ goto free_extent;
+
+ ret = update_block_group(trans, extent_root, start,
+ end + 1 - start, 0, mark_free);
+ BUG_ON(ret);
+ kfree(extent_op);
+ }
if (ret)
err = ret;
+
+ if (need_resched()) {
+ mutex_unlock(&extent_root->fs_info->alloc_mutex);
+ cond_resched();
+ mutex_lock(&extent_root->fs_info->alloc_mutex);
+ }
}
return err;
}
/*
* remove an extent from the root, returns 0 on success
*/
-int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, u64 bytenr, u64 num_bytes,
- u64 root_objectid, u64 ref_generation,
- u64 owner_objectid, u64 owner_offset, int pin)
+static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 bytenr, u64 num_bytes, u64 parent,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner_objectid, u64 owner_offset, int pin)
{
struct btrfs_root *extent_root = root->fs_info->extent_root;
int pending_ret;
int ret;
WARN_ON(num_bytes < root->sectorsize);
- if (!root->ref_cows)
- ref_generation = 0;
-
if (root == extent_root) {
- pin_down_bytes(root, bytenr, num_bytes, 1);
+ struct pending_extent_op *extent_op;
+
+ 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;
+
+ set_extent_bits(&root->fs_info->pending_del,
+ bytenr, bytenr + num_bytes - 1,
+ EXTENT_LOCKED, GFP_NOFS);
+ set_state_private(&root->fs_info->pending_del,
+ bytenr, (unsigned long)extent_op);
return 0;
}
- ret = __free_extent(trans, root, bytenr, num_bytes, root_objectid,
- ref_generation, owner_objectid, owner_offset,
- pin, pin == 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);
+ return 0;
+ }
+ 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,
+ root_objectid, ref_generation, owner_objectid,
+ owner_offset, pin, pin == 0);
+
+ finish_current_insert(trans, root->fs_info->extent_root);
pending_ret = del_pending_extents(trans, root->fs_info->extent_root);
return ret ? ret : pending_ret;
}
+int btrfs_free_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 bytenr, u64 num_bytes, u64 parent,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner_objectid, u64 owner_offset, int pin)
+{
+ int ret;
+
+ maybe_lock_mutex(root);
+ ret = __btrfs_free_extent(trans, root, bytenr, num_bytes, parent,
+ root_objectid, ref_generation,
+ owner_objectid, owner_offset, pin);
+ maybe_unlock_mutex(root);
+ return ret;
+}
+
static u64 stripe_align(struct btrfs_root *root, u64 val)
{
u64 mask = ((u64)root->stripesize - 1);
u64 total_needed = num_bytes;
u64 *last_ptr = NULL;
struct btrfs_block_group_cache *block_group;
- int full_scan = 0;
- int wrapped = 0;
int chunk_alloc_done = 0;
int empty_cluster = 2 * 1024 * 1024;
int allowed_chunk_alloc = 0;
empty_cluster = 256 * 1024;
}
- if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD)) {
+ if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD))
last_ptr = &root->fs_info->last_data_alloc;
+
+ if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) {
+ last_ptr = &root->fs_info->last_log_alloc;
+ if (!last_ptr == 0 && root->fs_info->last_alloc) {
+ *last_ptr = root->fs_info->last_alloc + empty_cluster;
+ }
}
if (last_ptr) {
if (*last_ptr)
hint_byte = *last_ptr;
- else {
+ else
empty_size += empty_cluster;
- }
}
search_start = max(search_start, first_logical_byte(root, 0));
if (search_end == (u64)-1)
search_end = btrfs_super_total_bytes(&info->super_copy);
- if (hint_byte) {
- block_group = btrfs_lookup_first_block_group(info, hint_byte);
- if (!block_group)
- hint_byte = search_start;
- block_group = btrfs_find_block_group(root, block_group,
- hint_byte, data, 1);
- if (last_ptr && *last_ptr == 0 && block_group)
- hint_byte = block_group->key.objectid;
- } else {
- block_group = btrfs_find_block_group(root,
- trans->block_group,
- search_start, data, 1);
- }
search_start = max(search_start, hint_byte);
-
total_needed += empty_size;
-check_failed:
- if (!block_group) {
- block_group = btrfs_lookup_first_block_group(info,
- search_start);
- if (!block_group)
- block_group = btrfs_lookup_first_block_group(info,
- orig_search_start);
- }
- if (full_scan && !chunk_alloc_done) {
- if (allowed_chunk_alloc) {
- do_chunk_alloc(trans, root,
- num_bytes + 2 * 1024 * 1024, data, 1);
- allowed_chunk_alloc = 0;
- } else if (block_group && block_group_bits(block_group, data)) {
- block_group->space_info->force_alloc = 1;
+new_group:
+ block_group = btrfs_lookup_block_group(info, search_start);
+
+ /*
+ * Ok this looks a little tricky, buts its really simple. First if we
+ * didn't find a block group obviously we want to start over.
+ * Secondly, if the block group we found does not match the type we
+ * need, and we have a last_ptr and its not 0, chances are the last
+ * allocation we made was at the end of the block group, so lets go
+ * ahead and skip the looking through the rest of the block groups and
+ * start at the beginning. This helps with metadata allocations,
+ * since you are likely to have a bunch of data block groups to search
+ * through first before you realize that you need to start over, so go
+ * ahead and start over and save the time.
+ */
+ if (!block_group || (!block_group_bits(block_group, data) &&
+ last_ptr && *last_ptr)) {
+ if (search_start != orig_search_start) {
+ if (last_ptr && *last_ptr)
+ *last_ptr = 0;
+ search_start = orig_search_start;
+ goto new_group;
+ } else if (!chunk_alloc_done && allowed_chunk_alloc) {
+ ret = do_chunk_alloc(trans, root,
+ num_bytes + 2 * 1024 * 1024,
+ data, 1);
+ if (ret < 0) {
+ struct btrfs_space_info *info;
+
+ info = __find_space_info(root->fs_info, data);
+ goto error;
+ }
+ BUG_ON(ret);
+ chunk_alloc_done = 1;
+ search_start = orig_search_start;
+ goto new_group;
+ } else {
+ ret = -ENOSPC;
+ goto error;
}
- chunk_alloc_done = 1;
- }
- ret = find_search_start(root, &block_group, &search_start,
- total_needed, data);
- if (ret == -ENOSPC && last_ptr && *last_ptr) {
- *last_ptr = 0;
- block_group = btrfs_lookup_first_block_group(info,
- orig_search_start);
- search_start = orig_search_start;
- ret = find_search_start(root, &block_group, &search_start,
- total_needed, data);
}
- if (ret == -ENOSPC)
- goto enospc;
- if (ret)
- goto error;
- if (last_ptr && *last_ptr && search_start != *last_ptr) {
- *last_ptr = 0;
- if (!empty_size) {
- empty_size += empty_cluster;
- total_needed += empty_size;
+ /*
+ * this is going to seach through all of the existing block groups it
+ * can find, so if we don't find something we need to see if we can
+ * allocate what we need.
+ */
+ ret = find_free_space(root, &block_group, &search_start,
+ total_needed, data);
+ if (ret == -ENOSPC) {
+ /*
+ * instead of allocating, start at the original search start
+ * and see if there is something to be found, if not then we
+ * allocate
+ */
+ if (search_start != orig_search_start) {
+ if (last_ptr && *last_ptr) {
+ *last_ptr = 0;
+ total_needed += empty_cluster;
+ }
+ search_start = orig_search_start;
+ goto new_group;
}
- block_group = btrfs_lookup_first_block_group(info,
- orig_search_start);
- search_start = orig_search_start;
- ret = find_search_start(root, &block_group,
- &search_start, total_needed, data);
- if (ret == -ENOSPC)
- goto enospc;
- if (ret)
+
+ /*
+ * we've already allocated, we're pretty screwed
+ */
+ if (chunk_alloc_done) {
+ goto error;
+ } else if (!allowed_chunk_alloc && block_group &&
+ block_group_bits(block_group, data)) {
+ block_group->space_info->force_alloc = 1;
+ goto error;
+ } else if (!allowed_chunk_alloc) {
+ goto error;
+ }
+
+ ret = do_chunk_alloc(trans, root, num_bytes + 2 * 1024 * 1024,
+ data, 1);
+ if (ret < 0)
goto error;
+
+ BUG_ON(ret);
+ chunk_alloc_done = 1;
+ if (block_group)
+ search_start = block_group->key.objectid +
+ block_group->key.offset;
+ else
+ search_start = orig_search_start;
+ goto new_group;
}
+ if (ret)
+ goto error;
+
search_start = stripe_align(root, search_start);
ins->objectid = search_start;
ins->offset = num_bytes;
- if (ins->objectid + num_bytes >= search_end)
- goto enospc;
+ if (ins->objectid + num_bytes >= search_end) {
+ search_start = orig_search_start;
+ if (chunk_alloc_done) {
+ ret = -ENOSPC;
+ goto error;
+ }
+ goto new_group;
+ }
if (ins->objectid + num_bytes >
block_group->key.objectid + block_group->key.offset) {
+ if (search_start == orig_search_start && chunk_alloc_done) {
+ ret = -ENOSPC;
+ goto error;
+ }
search_start = block_group->key.objectid +
block_group->key.offset;
goto new_group;
}
- if (test_range_bit(&info->extent_ins, ins->objectid,
- ins->objectid + num_bytes -1, EXTENT_LOCKED, 0)) {
- search_start = ins->objectid + num_bytes;
- goto new_group;
- }
-
- if (test_range_bit(&info->pinned_extents, ins->objectid,
- ins->objectid + num_bytes -1, EXTENT_DIRTY, 0)) {
- search_start = ins->objectid + num_bytes;
- goto new_group;
- }
-
if (exclude_nr > 0 && (ins->objectid + num_bytes > exclude_start &&
ins->objectid < exclude_start + exclude_nr)) {
search_start = exclude_start + exclude_nr;
goto new_group;
}
- if (!(data & BTRFS_BLOCK_GROUP_DATA)) {
- block_group = btrfs_lookup_block_group(info, ins->objectid);
- if (block_group)
- trans->block_group = block_group;
- }
+ if (!(data & BTRFS_BLOCK_GROUP_DATA))
+ trans->block_group = block_group;
+
ins->offset = num_bytes;
if (last_ptr) {
*last_ptr = ins->objectid + ins->offset;
if (*last_ptr ==
- btrfs_super_total_bytes(&root->fs_info->super_copy)) {
+ btrfs_super_total_bytes(&root->fs_info->super_copy))
*last_ptr = 0;
- }
- }
- return 0;
-
-new_group:
- if (search_start + num_bytes >= search_end) {
-enospc:
- search_start = orig_search_start;
- if (full_scan) {
- ret = -ENOSPC;
- goto error;
- }
- if (wrapped) {
- if (!full_scan)
- total_needed -= empty_size;
- full_scan = 1;
- } else
- wrapped = 1;
}
- block_group = btrfs_lookup_first_block_group(info, search_start);
- cond_resched();
- block_group = btrfs_find_block_group(root, block_group,
- search_start, data, 0);
- goto check_failed;
+ ret = 0;
error:
return ret;
}
-/*
- * finds a free extent and does all the dirty work required for allocation
- * returns the key for the extent through ins, and a tree buffer for
- * the first block of the extent through buf.
- *
- * returns 0 if everything worked, non-zero otherwise.
- */
-int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- u64 num_bytes, u64 min_alloc_size,
- u64 root_objectid, u64 ref_generation,
- u64 owner, u64 owner_offset,
- u64 empty_size, u64 hint_byte,
- u64 search_end, struct btrfs_key *ins, u64 data)
+static 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 %Lu free, is %sfull\n",
+ info->total_bytes - info->bytes_used - info->bytes_pinned,
+ (info->full) ? "" : "not ");
+
+ spin_lock(&info->lock);
+ list_for_each(l, &info->block_groups) {
+ cache = list_entry(l, struct btrfs_block_group_cache, list);
+ spin_lock(&cache->lock);
+ printk(KERN_INFO "block group %Lu has %Lu bytes, %Lu used "
+ "%Lu pinned\n",
+ cache->key.objectid, cache->key.offset,
+ btrfs_block_group_used(&cache->item), cache->pinned);
+ btrfs_dump_free_space(cache, bytes);
+ spin_unlock(&cache->lock);
+ }
+ spin_unlock(&info->lock);
+}
+static int __btrfs_reserve_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 num_bytes, u64 min_alloc_size,
+ u64 empty_size, u64 hint_byte,
+ u64 search_end, struct btrfs_key *ins,
+ u64 data)
{
int ret;
- int pending_ret;
- u64 super_used;
- u64 root_used;
u64 search_start = 0;
u64 alloc_profile;
- u32 sizes[2];
struct btrfs_fs_info *info = root->fs_info;
- struct btrfs_root *extent_root = info->extent_root;
- struct btrfs_extent_item *extent_item;
- struct btrfs_extent_ref *ref;
- struct btrfs_path *path;
- struct btrfs_key keys[2];
+ struct btrfs_block_group_cache *cache;
if (data) {
alloc_profile = info->avail_data_alloc_bits &
BTRFS_BLOCK_GROUP_METADATA |
(info->metadata_alloc_profile &
info->avail_metadata_alloc_bits), 0);
- BUG_ON(ret);
}
ret = do_chunk_alloc(trans, root->fs_info->extent_root,
num_bytes + 2 * 1024 * 1024, data, 0);
- BUG_ON(ret);
}
WARN_ON(num_bytes < root->sectorsize);
if (ret == -ENOSPC && num_bytes > min_alloc_size) {
num_bytes = num_bytes >> 1;
+ num_bytes = num_bytes & ~(root->sectorsize - 1);
num_bytes = max(num_bytes, min_alloc_size);
do_chunk_alloc(trans, root->fs_info->extent_root,
num_bytes, data, 1);
goto again;
}
if (ret) {
- printk("allocation failed flags %Lu\n", data);
+ struct btrfs_space_info *sinfo;
+
+ sinfo = __find_space_info(root->fs_info, data);
+ printk("allocation failed flags %Lu, wanted %Lu\n",
+ data, num_bytes);
+ dump_space_info(sinfo, num_bytes);
+ BUG();
}
- BUG_ON(ret);
- if (ret)
- return ret;
+ cache = btrfs_lookup_block_group(root->fs_info, ins->objectid);
+ if (!cache) {
+ printk(KERN_ERR "Unable to find block group for %Lu\n", ins->objectid);
+ return -ENOSPC;
+ }
+
+ ret = btrfs_remove_free_space(cache, ins->objectid, ins->offset);
+
+ return ret;
+}
+
+int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len)
+{
+ struct btrfs_block_group_cache *cache;
+
+ maybe_lock_mutex(root);
+ cache = btrfs_lookup_block_group(root->fs_info, start);
+ if (!cache) {
+ printk(KERN_ERR "Unable to find block group for %Lu\n", start);
+ maybe_unlock_mutex(root);
+ return -ENOSPC;
+ }
+ btrfs_add_free_space(cache, start, len);
+ maybe_unlock_mutex(root);
+ return 0;
+}
+
+int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 num_bytes, u64 min_alloc_size,
+ u64 empty_size, u64 hint_byte,
+ u64 search_end, struct btrfs_key *ins,
+ u64 data)
+{
+ int ret;
+ maybe_lock_mutex(root);
+ ret = __btrfs_reserve_extent(trans, root, num_bytes, min_alloc_size,
+ empty_size, hint_byte, search_end, ins,
+ data);
+ maybe_unlock_mutex(root);
+ return ret;
+}
+
+static int __btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 parent,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner, u64 owner_offset,
+ struct btrfs_key *ins)
+{
+ int ret;
+ int pending_ret;
+ u64 super_used;
+ u64 root_used;
+ u64 num_bytes = ins->offset;
+ u32 sizes[2];
+ struct btrfs_fs_info *info = root->fs_info;
+ struct btrfs_root *extent_root = info->extent_root;
+ struct btrfs_extent_item *extent_item;
+ struct btrfs_extent_ref *ref;
+ struct btrfs_path *path;
+ struct btrfs_key keys[2];
+
+ if (parent == 0)
+ parent = ins->objectid;
/* block accounting for super block */
+ spin_lock_irq(&info->delalloc_lock);
super_used = btrfs_super_bytes_used(&info->super_copy);
btrfs_set_super_bytes_used(&info->super_copy, super_used + num_bytes);
+ spin_unlock_irq(&info->delalloc_lock);
/* block accounting for root item */
root_used = btrfs_root_used(&root->root_item);
btrfs_set_root_used(&root->root_item, root_used + num_bytes);
- clear_extent_dirty(&root->fs_info->free_space_cache,
- ins->objectid, ins->objectid + ins->offset - 1,
- GFP_NOFS);
-
if (root == extent_root) {
+ 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;
+
set_extent_bits(&root->fs_info->extent_ins, ins->objectid,
ins->objectid + ins->offset - 1,
EXTENT_LOCKED, GFP_NOFS);
+ set_state_private(&root->fs_info->extent_ins,
+ ins->objectid, (unsigned long)extent_op);
goto update_block;
}
- WARN_ON(trans->alloc_exclude_nr);
- trans->alloc_exclude_start = ins->objectid;
- trans->alloc_exclude_nr = ins->offset;
-
memcpy(&keys[0], ins, sizeof(*ins));
- keys[1].offset = hash_extent_ref(root_objectid, ref_generation,
- owner, owner_offset);
keys[1].objectid = ins->objectid;
keys[1].type = BTRFS_EXTENT_REF_KEY;
+ keys[1].offset = parent;
sizes[0] = sizeof(*extent_item);
sizes[1] = sizeof(*ref);
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_ref_generation(path->nodes[0], ref, ref_generation);
btrfs_set_ref_objectid(path->nodes[0], ref, owner);
btrfs_set_ref_offset(path->nodes[0], ref, owner_offset);
+ btrfs_set_ref_num_refs(path->nodes[0], ref, 1);
btrfs_mark_buffer_dirty(path->nodes[0]);
finish_current_insert(trans, extent_root);
pending_ret = del_pending_extents(trans, extent_root);
- if (ret) {
- return ret;
- }
+ if (ret)
+ goto out;
if (pending_ret) {
- return pending_ret;
+ ret = pending_ret;
+ goto out;
}
update_block:
ins->objectid, ins->offset);
BUG();
}
- return 0;
+out:
+ return ret;
+}
+
+int btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 parent,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner, u64 owner_offset,
+ struct btrfs_key *ins)
+{
+ int ret;
+
+ if (root_objectid == BTRFS_TREE_LOG_OBJECTID)
+ return 0;
+ maybe_lock_mutex(root);
+ ret = __btrfs_alloc_reserved_extent(trans, root, parent,
+ root_objectid, ref_generation,
+ owner, owner_offset, ins);
+ maybe_unlock_mutex(root);
+ return ret;
}
/*
- * helper function to allocate a block for a given tree
- * returns the tree buffer or NULL.
+ * this is used by the tree logging recovery code. It records that
+ * an extent has been allocated and makes sure to clear the free
+ * space cache bits as well
*/
-struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- u32 blocksize,
- u64 root_objectid, u64 hint,
- u64 empty_size)
+int btrfs_alloc_logged_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 parent,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner, u64 owner_offset,
+ struct btrfs_key *ins)
{
- u64 ref_generation;
+ int ret;
+ struct btrfs_block_group_cache *block_group;
- if (root->ref_cows)
- ref_generation = trans->transid;
- else
- ref_generation = 0;
+ maybe_lock_mutex(root);
+ block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid);
+ cache_block_group(root, block_group);
+
+ ret = btrfs_remove_free_space(block_group, ins->objectid, ins->offset);
+ BUG_ON(ret);
+ ret = __btrfs_alloc_reserved_extent(trans, root, parent,
+ root_objectid, ref_generation,
+ owner, owner_offset, ins);
+ maybe_unlock_mutex(root);
+ return ret;
+}
+
+/*
+ * finds a free extent and does all the dirty work required for allocation
+ * returns the key for the extent through ins, and a tree buffer for
+ * the first block of the extent through buf.
+ *
+ * returns 0 if everything worked, non-zero otherwise.
+ */
+int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 num_bytes, u64 parent, u64 min_alloc_size,
+ u64 root_objectid, u64 ref_generation,
+ u64 owner_objectid, u64 owner_offset,
+ u64 empty_size, u64 hint_byte,
+ u64 search_end, struct btrfs_key *ins, u64 data)
+{
+ int ret;
+
+ maybe_lock_mutex(root);
+
+ ret = __btrfs_reserve_extent(trans, root, num_bytes,
+ min_alloc_size, empty_size, hint_byte,
+ search_end, ins, data);
+ BUG_ON(ret);
+ if (root_objectid != BTRFS_TREE_LOG_OBJECTID) {
+ ret = __btrfs_alloc_reserved_extent(trans, root, parent,
+ root_objectid, ref_generation,
+ owner_objectid, owner_offset, ins);
+ BUG_ON(ret);
+
+ }
+ maybe_unlock_mutex(root);
+ return ret;
+}
+struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 bytenr, u32 blocksize)
+{
+ struct extent_buffer *buf;
- return __btrfs_alloc_free_block(trans, root, blocksize, root_objectid,
- ref_generation, 0, 0, hint, empty_size);
+ buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
+ if (!buf)
+ return ERR_PTR(-ENOMEM);
+ btrfs_set_header_generation(buf, trans->transid);
+ btrfs_tree_lock(buf);
+ clean_tree_block(trans, root, buf);
+ btrfs_set_buffer_uptodate(buf);
+ if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) {
+ set_extent_dirty(&root->dirty_log_pages, buf->start,
+ buf->start + buf->len - 1, GFP_NOFS);
+ } else {
+ set_extent_dirty(&trans->transaction->dirty_pages, buf->start,
+ buf->start + buf->len - 1, GFP_NOFS);
+ }
+ trans->blocks_used++;
+ return buf;
}
/*
* helper function to allocate a block for a given tree
* returns the tree buffer or NULL.
*/
-struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
+struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
- u32 blocksize,
+ u32 blocksize, u64 parent,
u64 root_objectid,
u64 ref_generation,
- u64 first_objectid,
int level,
u64 hint,
u64 empty_size)
int ret;
struct extent_buffer *buf;
- ret = btrfs_alloc_extent(trans, root, blocksize, blocksize,
- root_objectid, ref_generation,
- level, first_objectid, empty_size, hint,
- (u64)-1, &ins, 0);
+ ret = btrfs_alloc_extent(trans, root, blocksize, parent, blocksize,
+ root_objectid, ref_generation, level, 0,
+ empty_size, hint, (u64)-1, &ins, 0);
if (ret) {
BUG_ON(ret > 0);
return ERR_PTR(ret);
}
- buf = btrfs_find_create_tree_block(root, ins.objectid, blocksize);
- if (!buf) {
- btrfs_free_extent(trans, root, ins.objectid, blocksize,
- root->root_key.objectid, ref_generation,
- 0, 0, 0);
- return ERR_PTR(-ENOMEM);
- }
- btrfs_set_header_generation(buf, trans->transid);
- clean_tree_block(trans, root, buf);
- btrfs_set_buffer_uptodate(buf);
-
- if (PageDirty(buf->first_page)) {
- printk("page %lu dirty\n", buf->first_page->index);
- WARN_ON(1);
- }
- set_extent_dirty(&trans->transaction->dirty_pages, buf->start,
- buf->start + buf->len - 1, GFP_NOFS);
- if (!btrfs_test_opt(root, SSD))
- btrfs_set_buffer_defrag(buf);
- trans->blocks_used++;
+ buf = btrfs_init_new_buffer(trans, root, ins.objectid, blocksize);
return buf;
}
-static int noinline drop_leaf_ref(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct extent_buffer *leaf)
+int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct extent_buffer *leaf)
{
u64 leaf_owner;
u64 leaf_generation;
for (i = 0; i < nritems; i++) {
u64 disk_bytenr;
+ cond_resched();
btrfs_item_key_to_cpu(leaf, &key, i);
if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
if (disk_bytenr == 0)
continue;
- ret = btrfs_free_extent(trans, root, disk_bytenr,
+
+ mutex_lock(&root->fs_info->alloc_mutex);
+ ret = __btrfs_free_extent(trans, root, disk_bytenr,
btrfs_file_extent_disk_num_bytes(leaf, fi),
- leaf_owner, leaf_generation,
+ leaf->start, leaf_owner, leaf_generation,
key.objectid, key.offset, 0);
+ mutex_unlock(&root->fs_info->alloc_mutex);
BUG_ON(ret);
+
+ atomic_inc(&root->fs_info->throttle_gen);
+ wake_up(&root->fs_info->transaction_throttle);
+ cond_resched();
}
return 0;
}
-static void noinline reada_walk_down(struct btrfs_root *root,
- struct extent_buffer *node,
- int slot)
+static int noinline cache_drop_leaf_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_leaf_ref *ref)
{
- u64 bytenr;
- u64 last = 0;
- u32 nritems;
- u32 refs;
- u32 blocksize;
- int ret;
int i;
- int level;
- int skipped = 0;
-
- nritems = btrfs_header_nritems(node);
- level = btrfs_header_level(node);
- if (level)
- return;
-
- for (i = slot; i < nritems && skipped < 32; i++) {
- bytenr = btrfs_node_blockptr(node, i);
- if (last && ((bytenr > last && bytenr - last > 32 * 1024) ||
- (last > bytenr && last - bytenr > 32 * 1024))) {
- skipped++;
- continue;
+ int ret;
+ struct btrfs_extent_info *info = ref->extents;
+
+ for (i = 0; i < ref->nritems; i++) {
+ mutex_lock(&root->fs_info->alloc_mutex);
+ ret = __btrfs_free_extent(trans, root, info->bytenr,
+ info->num_bytes, ref->bytenr,
+ ref->owner, ref->generation,
+ info->objectid, info->offset, 0);
+ mutex_unlock(&root->fs_info->alloc_mutex);
+
+ atomic_inc(&root->fs_info->throttle_gen);
+ wake_up(&root->fs_info->transaction_throttle);
+ cond_resched();
+
+ BUG_ON(ret);
+ info++;
+ }
+
+ return 0;
+}
+
+int drop_snap_lookup_refcount(struct btrfs_root *root, u64 start, u64 len,
+ u32 *refs)
+{
+ int ret;
+
+ ret = btrfs_lookup_extent_ref(NULL, root, start, len, refs);
+ BUG_ON(ret);
+
+#if 0 // some debugging code in case we see problems here
+ /* if the refs count is one, it won't get increased again. But
+ * if the ref count is > 1, someone may be decreasing it at
+ * the same time we are.
+ */
+ if (*refs != 1) {
+ struct extent_buffer *eb = NULL;
+ eb = btrfs_find_create_tree_block(root, start, len);
+ if (eb)
+ btrfs_tree_lock(eb);
+
+ mutex_lock(&root->fs_info->alloc_mutex);
+ ret = lookup_extent_ref(NULL, root, start, len, refs);
+ BUG_ON(ret);
+ mutex_unlock(&root->fs_info->alloc_mutex);
+
+ if (eb) {
+ btrfs_tree_unlock(eb);
+ free_extent_buffer(eb);
}
- blocksize = btrfs_level_size(root, level - 1);
- if (i != slot) {
- ret = lookup_extent_ref(NULL, root, bytenr,
- blocksize, &refs);
- BUG_ON(ret);
- if (refs != 1) {
- skipped++;
- continue;
- }
+ if (*refs == 1) {
+ printk("block %llu went down to one during drop_snap\n",
+ (unsigned long long)start);
}
- mutex_unlock(&root->fs_info->fs_mutex);
- ret = readahead_tree_block(root, bytenr, blocksize,
- btrfs_node_ptr_generation(node, i));
- last = bytenr + blocksize;
- cond_resched();
- mutex_lock(&root->fs_info->fs_mutex);
- if (ret)
- break;
+
}
+#endif
+
+ cond_resched();
+ return ret;
}
/*
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 = lookup_extent_ref(trans, root,
- path->nodes[*level]->start,
+ ret = drop_snap_lookup_refcount(root, path->nodes[*level]->start,
path->nodes[*level]->len, &refs);
BUG_ON(ret);
if (refs > 1)
btrfs_header_nritems(cur))
break;
if (*level == 0) {
- ret = drop_leaf_ref(trans, root, cur);
+ ret = btrfs_drop_leaf_ref(trans, root, cur);
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 = lookup_extent_ref(trans, root, bytenr, blocksize, &refs);
+
+ ret = drop_snap_lookup_refcount(root, bytenr, blocksize, &refs);
BUG_ON(ret);
if (refs != 1) {
parent = path->nodes[*level];
root_owner = btrfs_header_owner(parent);
root_gen = btrfs_header_generation(parent);
path->slots[*level]++;
- ret = btrfs_free_extent(trans, root, bytenr,
- blocksize, root_owner,
- root_gen, 0, 0, 1);
+
+ mutex_lock(&root->fs_info->alloc_mutex);
+ ret = __btrfs_free_extent(trans, root, bytenr,
+ blocksize, parent->start,
+ root_owner, root_gen, 0, 0, 1);
BUG_ON(ret);
+ mutex_unlock(&root->fs_info->alloc_mutex);
+
+ atomic_inc(&root->fs_info->throttle_gen);
+ wake_up(&root->fs_info->transaction_throttle);
+ cond_resched();
+
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
+ */
+ if (*level == 1) {
+ ref = btrfs_lookup_leaf_ref(root, bytenr);
+ 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;
+ }
+ if (printk_ratelimit())
+ printk("leaf ref miss for bytenr %llu\n",
+ (unsigned long long)bytenr);
+ }
next = btrfs_find_tree_block(root, bytenr, blocksize);
if (!next || !btrfs_buffer_uptodate(next, ptr_gen)) {
free_extent_buffer(next);
- reada_walk_down(root, cur, path->slots[*level]);
- mutex_unlock(&root->fs_info->fs_mutex);
next = read_tree_block(root, bytenr, blocksize,
ptr_gen);
- mutex_lock(&root->fs_info->fs_mutex);
-
- /* we've dropped the lock, double check */
- ret = lookup_extent_ref(trans, root, bytenr,
- blocksize, &refs);
+ 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);
- if (refs != 1) {
- parent = path->nodes[*level];
- root_owner = btrfs_header_owner(parent);
- root_gen = btrfs_header_generation(parent);
-
- path->slots[*level]++;
- free_extent_buffer(next);
- ret = btrfs_free_extent(trans, root, bytenr,
- blocksize,
- root_owner,
- root_gen, 0, 0, 1);
- BUG_ON(ret);
- continue;
- }
+ WARN_ON(refs != 1);
+#endif
}
WARN_ON(*level <= 0);
if (path->nodes[*level-1])
path->nodes[*level-1] = next;
*level = btrfs_header_level(next);
path->slots[*level] = 0;
+ cond_resched();
}
out:
WARN_ON(*level < 0);
WARN_ON(*level >= BTRFS_MAX_LEVEL);
if (path->nodes[*level] == root->node) {
- root_owner = root->root_key.objectid;
parent = path->nodes[*level];
+ bytenr = path->nodes[*level]->start;
} else {
parent = path->nodes[*level + 1];
- root_owner = btrfs_header_owner(parent);
+ bytenr = btrfs_node_blockptr(parent, path->slots[*level + 1]);
}
+ blocksize = btrfs_level_size(root, *level);
+ root_owner = btrfs_header_owner(parent);
root_gen = btrfs_header_generation(parent);
- ret = btrfs_free_extent(trans, root, path->nodes[*level]->start,
- path->nodes[*level]->len,
- root_owner, root_gen, 0, 0, 1);
+
+ mutex_lock(&root->fs_info->alloc_mutex);
+ ret = __btrfs_free_extent(trans, root, bytenr, blocksize,
+ parent->start, root_owner, root_gen,
+ 0, 0, 1);
+ mutex_unlock(&root->fs_info->alloc_mutex);
free_extent_buffer(path->nodes[*level]);
path->nodes[*level] = NULL;
*level += 1;
BUG_ON(ret);
+
+ cond_resched();
return 0;
}
root_item->drop_level = i;
return 0;
} else {
- if (path->nodes[*level] == root->node) {
- root_owner = root->root_key.objectid;
- root_gen =
- btrfs_header_generation(path->nodes[*level]);
- } else {
- struct extent_buffer *node;
- node = path->nodes[*level + 1];
- root_owner = btrfs_header_owner(node);
- root_gen = btrfs_header_generation(node);
- }
+ struct extent_buffer *parent;
+ if (path->nodes[*level] == root->node)
+ parent = path->nodes[*level];
+ else
+ parent = path->nodes[*level + 1];
+
+ root_owner = btrfs_header_owner(parent);
+ root_gen = btrfs_header_generation(parent);
ret = btrfs_free_extent(trans, root,
path->nodes[*level]->start,
path->nodes[*level]->len,
+ parent->start,
root_owner, root_gen, 0, 0, 1);
BUG_ON(ret);
free_extent_buffer(path->nodes[*level]);
int orig_level;
struct btrfs_root_item *root_item = &root->root_item;
+ WARN_ON(!mutex_is_locked(&root->fs_info->drop_mutex));
path = btrfs_alloc_path();
BUG_ON(!path);
btrfs_node_key(node, &found_key, path->slots[level]);
WARN_ON(memcmp(&found_key, &root_item->drop_progress,
sizeof(found_key)));
+ /*
+ * unlock our path, this is safe because only this
+ * function is allowed to delete this snapshot
+ */
+ for (i = 0; i < BTRFS_MAX_LEVEL; i++) {
+ if (path->nodes[i] && path->locks[i]) {
+ path->locks[i] = 0;
+ btrfs_tree_unlock(path->nodes[i]);
+ }
+ }
}
while(1) {
wret = walk_down_tree(trans, root, path, &level);
break;
if (wret < 0)
ret = wret;
- ret = -EAGAIN;
- break;
+ if (trans->transaction->in_commit) {
+ ret = -EAGAIN;
+ break;
+ }
+ atomic_inc(&root->fs_info->throttle_gen);
+ wake_up(&root->fs_info->transaction_throttle);
}
for (i = 0; i <= orig_level; i++) {
if (path->nodes[i]) {
int btrfs_free_block_groups(struct btrfs_fs_info *info)
{
- u64 start;
- u64 end;
- u64 ptr;
- int ret;
- while(1) {
- ret = find_first_extent_bit(&info->block_group_cache, 0,
- &start, &end, (unsigned int)-1);
- if (ret)
- break;
- ret = get_state_private(&info->block_group_cache, start, &ptr);
- if (!ret)
- kfree((void *)(unsigned long)ptr);
- clear_extent_bits(&info->block_group_cache, start,
- end, (unsigned int)-1, GFP_NOFS);
- }
- while(1) {
- ret = find_first_extent_bit(&info->free_space_cache, 0,
- &start, &end, EXTENT_DIRTY);
- if (ret)
- break;
- clear_extent_dirty(&info->free_space_cache, start,
- end, GFP_NOFS);
+ struct btrfs_block_group_cache *block_group;
+ struct rb_node *n;
+
+ mutex_lock(&info->alloc_mutex);
+ spin_lock(&info->block_group_cache_lock);
+ while ((n = rb_last(&info->block_group_cache_tree)) != NULL) {
+ block_group = rb_entry(n, struct btrfs_block_group_cache,
+ cache_node);
+
+ spin_unlock(&info->block_group_cache_lock);
+ btrfs_remove_free_space_cache(block_group);
+ spin_lock(&info->block_group_cache_lock);
+
+ rb_erase(&block_group->cache_node,
+ &info->block_group_cache_tree);
+
+ spin_lock(&block_group->space_info->lock);
+ list_del(&block_group->list);
+ spin_unlock(&block_group->space_info->lock);
+ kfree(block_group);
}
+ spin_unlock(&info->block_group_cache_lock);
+ mutex_unlock(&info->alloc_mutex);
return 0;
}
struct file_ra_state *ra;
unsigned long total_read = 0;
unsigned long ra_pages;
+ struct btrfs_ordered_extent *ordered;
struct btrfs_trans_handle *trans;
ra = kzalloc(sizeof(*ra), GFP_NOFS);
calc_ra(i, last_index, ra_pages));
}
total_read++;
- if (((u64)i << PAGE_CACHE_SHIFT) > inode->i_size)
+again:
+ if (((u64)i << PAGE_CACHE_SHIFT) > i_size_read(inode))
goto truncate_racing;
-
page = grab_cache_page(inode->i_mapping, i);
if (!page) {
goto out_unlock;
goto out_unlock;
}
}
-#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
- ClearPageDirty(page);
-#else
- cancel_dirty_page(page, PAGE_CACHE_SIZE);
-#endif
wait_on_page_writeback(page);
- set_page_extent_mapped(page);
+
page_start = (u64)page->index << PAGE_CACHE_SHIFT;
page_end = page_start + PAGE_CACHE_SIZE - 1;
-
lock_extent(io_tree, page_start, page_end, GFP_NOFS);
- set_extent_delalloc(io_tree, page_start,
- page_end, GFP_NOFS);
+ ordered = btrfs_lookup_ordered_extent(inode, page_start);
+ if (ordered) {
+ unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
+ unlock_page(page);
+ page_cache_release(page);
+ btrfs_start_ordered_extent(inode, ordered, 1);
+ btrfs_put_ordered_extent(ordered);
+ goto again;
+ }
+ set_page_extent_mapped(page);
+
+ /*
+ * make sure page_mkwrite is called for this page if userland
+ * wants to change it from mmap
+ */
+ clear_page_dirty_for_io(page);
+
+ btrfs_set_extent_delalloc(inode, page_start, page_end);
set_page_dirty(page);
unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
unlock_page(page);
page_cache_release(page);
}
- balance_dirty_pages_ratelimited_nr(inode->i_mapping,
- total_read);
out_unlock:
+ /* we have to start the IO in order to get the ordered extents
+ * instantiated. This allows the relocation to code to wait
+ * for all the ordered extents to hit the disk.
+ *
+ * Otherwise, it would constantly loop over the same extents
+ * because the old ones don't get deleted until the IO is
+ * started
+ */
+ btrfs_fdatawrite_range(inode->i_mapping, start, start + len - 1,
+ WB_SYNC_NONE);
kfree(ra);
trans = btrfs_start_transaction(BTRFS_I(inode)->root, 1);
if (trans) {
- btrfs_add_ordered_inode(inode);
btrfs_end_transaction(trans, BTRFS_I(inode)->root);
mark_inode_dirty(inode);
}
u64 root_search_start = BTRFS_FS_TREE_OBJECTID;
u64 found_bytenr;
int ret;
- int i;
root_location.offset = (u64)-1;
root_location.type = BTRFS_ROOT_ITEM_KEY;
found_bytenr = path->nodes[level]->start;
}
- for (i = level; i < BTRFS_MAX_LEVEL; i++) {
- if (!path->nodes[i])
- break;
- free_extent_buffer(path->nodes[i]);
- path->nodes[i] = NULL;
- }
btrfs_release_path(cur_root, path);
if (found_bytenr == bytenr) {
int ret;
int level;
+ WARN_ON(!mutex_is_locked(&extent_root->fs_info->alloc_mutex));
+
ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_extent_ref);
ref_root = btrfs_ref_root(path->nodes[0], ref);
found_root = btrfs_read_fs_root_no_name(extent_root->fs_info,
&root_location);
BUG_ON(!found_root);
+ mutex_unlock(&extent_root->fs_info->alloc_mutex);
if (ref_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
found_key.objectid = ref_objectid;
*last_file_root == ref_root)
goto out;
- mutex_unlock(&extent_root->fs_info->fs_mutex);
inode = btrfs_iget_locked(extent_root->fs_info->sb,
ref_objectid, found_root);
if (inode->i_state & I_NEW) {
/* this can happen if the reference is not against
* the latest version of the tree root
*/
- if (is_bad_inode(inode)) {
- mutex_lock(&extent_root->fs_info->fs_mutex);
+ if (is_bad_inode(inode))
goto out;
- }
+
*last_file_objectid = inode->i_ino;
*last_file_root = found_root->root_key.objectid;
*last_file_offset = ref_offset;
relocate_inode_pages(inode, ref_offset, extent_key->offset);
iput(inode);
- mutex_lock(&extent_root->fs_info->fs_mutex);
} else {
struct btrfs_trans_handle *trans;
struct extent_buffer *eb;
- int i;
+ int needs_lock = 0;
eb = read_tree_block(found_root, extent_key->objectid,
extent_key->offset, 0);
+ btrfs_tree_lock(eb);
level = btrfs_header_level(eb);
if (level == 0)
else
btrfs_node_key_to_cpu(eb, &found_key, 0);
+ btrfs_tree_unlock(eb);
free_extent_buffer(eb);
ret = find_root_for_ref(extent_root, path, &found_key,
if (ret)
goto out;
+ /*
+ * right here almost anything could happen to our key,
+ * but that's ok. The cow below will either relocate it
+ * or someone else will have relocated it. Either way,
+ * it is in a different spot than it was before and
+ * we're happy.
+ */
+
trans = btrfs_start_transaction(found_root, 1);
+ if (found_root == extent_root->fs_info->extent_root ||
+ found_root == extent_root->fs_info->chunk_root ||
+ found_root == extent_root->fs_info->dev_root) {
+ needs_lock = 1;
+ mutex_lock(&extent_root->fs_info->alloc_mutex);
+ }
+
path->lowest_level = level;
path->reada = 2;
ret = btrfs_search_slot(trans, found_root, &found_key, path,
0, 1);
path->lowest_level = 0;
- for (i = level; i < BTRFS_MAX_LEVEL; i++) {
- if (!path->nodes[i])
- break;
- free_extent_buffer(path->nodes[i]);
- path->nodes[i] = NULL;
- }
btrfs_release_path(found_root, path);
+
if (found_root == found_root->fs_info->extent_root)
btrfs_extent_post_op(trans, found_root);
+ if (needs_lock)
+ mutex_unlock(&extent_root->fs_info->alloc_mutex);
+
btrfs_end_transaction(trans, found_root);
- }
+ }
out:
+ mutex_lock(&extent_root->fs_info->alloc_mutex);
return 0;
}
u64 new_alloc_flags;
u64 calc;
+ spin_lock(&shrink_block_group->lock);
if (btrfs_block_group_used(&shrink_block_group->item) > 0) {
+ spin_unlock(&shrink_block_group->lock);
+ mutex_unlock(&root->fs_info->alloc_mutex);
trans = btrfs_start_transaction(root, 1);
+ mutex_lock(&root->fs_info->alloc_mutex);
+ spin_lock(&shrink_block_group->lock);
+
new_alloc_flags = update_block_group_flags(root,
shrink_block_group->flags);
if (new_alloc_flags != shrink_block_group->flags) {
} else {
calc = shrink_block_group->key.offset;
}
+ spin_unlock(&shrink_block_group->lock);
+
do_chunk_alloc(trans, root->fs_info->extent_root,
calc + 2 * 1024 * 1024, new_alloc_flags, force);
+
+ mutex_unlock(&root->fs_info->alloc_mutex);
btrfs_end_transaction(trans, root);
- }
+ mutex_lock(&root->fs_info->alloc_mutex);
+ } else
+ spin_unlock(&shrink_block_group->lock);
return 0;
}
u64 total_found;
u64 shrink_last_byte;
struct btrfs_block_group_cache *shrink_block_group;
- struct btrfs_fs_info *info = root->fs_info;
struct btrfs_key key;
struct btrfs_key found_key;
struct extent_buffer *leaf;
int ret;
int progress;
+ mutex_lock(&root->fs_info->alloc_mutex);
shrink_block_group = btrfs_lookup_block_group(root->fs_info,
shrink_start);
BUG_ON(!shrink_block_group);
key.type = 0;
cur_byte = key.objectid;
+ mutex_unlock(&root->fs_info->alloc_mutex);
+
+ btrfs_start_delalloc_inodes(root);
+ btrfs_wait_ordered_extents(tree_root, 0);
+
+ mutex_lock(&root->fs_info->alloc_mutex);
+
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
goto out;
if (ret < 0)
goto out;
+next:
leaf = path->nodes[0];
nritems = btrfs_header_nritems(leaf);
-next:
if (path->slots[0] >= nritems) {
ret = btrfs_next_leaf(root, path);
if (ret < 0)
if (progress && need_resched()) {
memcpy(&key, &found_key, sizeof(key));
- mutex_unlock(&root->fs_info->fs_mutex);
cond_resched();
- mutex_lock(&root->fs_info->fs_mutex);
btrfs_release_path(root, path);
btrfs_search_slot(NULL, root, &key, path, 0, 0);
progress = 0;
printk("btrfs relocate found %llu last extent was %llu\n",
(unsigned long long)total_found,
(unsigned long long)found_key.objectid);
+ mutex_unlock(&root->fs_info->alloc_mutex);
trans = btrfs_start_transaction(tree_root, 1);
btrfs_commit_transaction(trans, tree_root);
- mutex_unlock(&root->fs_info->fs_mutex);
btrfs_clean_old_snapshots(tree_root);
- mutex_lock(&root->fs_info->fs_mutex);
+
+ btrfs_start_delalloc_inodes(root);
+ btrfs_wait_ordered_extents(tree_root, 0);
trans = btrfs_start_transaction(tree_root, 1);
btrfs_commit_transaction(trans, tree_root);
+ mutex_lock(&root->fs_info->alloc_mutex);
goto again;
}
* we've freed all the extents, now remove the block
* group item from the tree
*/
+ mutex_unlock(&root->fs_info->alloc_mutex);
+
trans = btrfs_start_transaction(root, 1);
+
+ mutex_lock(&root->fs_info->alloc_mutex);
memcpy(&key, &shrink_block_group->key, sizeof(key));
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret > 0)
ret = -EIO;
- if (ret < 0)
+ if (ret < 0) {
+ btrfs_end_transaction(trans, root);
goto out;
+ }
- clear_extent_bits(&info->block_group_cache, key.objectid,
- key.objectid + key.offset - 1,
- (unsigned int)-1, GFP_NOFS);
-
-
- clear_extent_bits(&info->free_space_cache,
- key.objectid, key.objectid + key.offset - 1,
- (unsigned int)-1, GFP_NOFS);
+ spin_lock(&root->fs_info->block_group_cache_lock);
+ rb_erase(&shrink_block_group->cache_node,
+ &root->fs_info->block_group_cache_tree);
+ spin_unlock(&root->fs_info->block_group_cache_lock);
+ ret = btrfs_remove_free_space(shrink_block_group, key.objectid,
+ key.offset);
+ if (ret) {
+ btrfs_end_transaction(trans, root);
+ goto out;
+ }
+ /*
memset(shrink_block_group, 0, sizeof(*shrink_block_group));
kfree(shrink_block_group);
+ */
btrfs_del_item(trans, root, path);
+ btrfs_release_path(root, path);
+ mutex_unlock(&root->fs_info->alloc_mutex);
btrfs_commit_transaction(trans, root);
+ mutex_lock(&root->fs_info->alloc_mutex);
+
/* the code to unpin extents might set a few bits in the free
* space cache for this range again
*/
- clear_extent_bits(&info->free_space_cache,
- key.objectid, key.objectid + key.offset - 1,
- (unsigned int)-1, GFP_NOFS);
+ /* XXX? */
+ ret = btrfs_remove_free_space(shrink_block_group, key.objectid,
+ key.offset);
out:
btrfs_free_path(path);
+ mutex_unlock(&root->fs_info->alloc_mutex);
return ret;
}
int find_first_block_group(struct btrfs_root *root, struct btrfs_path *path,
struct btrfs_key *key)
{
- int ret;
+ int ret = 0;
struct btrfs_key found_key;
struct extent_buffer *leaf;
int slot;
ret = btrfs_search_slot(NULL, root, key, path, 0, 0);
if (ret < 0)
- return ret;
+ goto out;
+
while(1) {
slot = path->slots[0];
leaf = path->nodes[0];
if (ret == 0)
continue;
if (ret < 0)
- goto error;
+ goto out;
break;
}
btrfs_item_key_to_cpu(leaf, &found_key, slot);
if (found_key.objectid >= key->objectid &&
- found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY)
- return 0;
+ found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) {
+ ret = 0;
+ goto out;
+ }
path->slots[0]++;
}
ret = -ENOENT;
-error:
+out:
return ret;
}
{
struct btrfs_path *path;
int ret;
- int bit;
struct btrfs_block_group_cache *cache;
struct btrfs_fs_info *info = root->fs_info;
struct btrfs_space_info *space_info;
- struct extent_io_tree *block_group_cache;
struct btrfs_key key;
struct btrfs_key found_key;
struct extent_buffer *leaf;
- block_group_cache = &info->block_group_cache;
root = info->extent_root;
key.objectid = 0;
key.offset = 0;
if (!path)
return -ENOMEM;
+ mutex_lock(&root->fs_info->alloc_mutex);
while(1) {
ret = find_first_block_group(root, path, &key);
if (ret > 0) {
break;
}
+ spin_lock_init(&cache->lock);
+ INIT_LIST_HEAD(&cache->list);
read_extent_buffer(leaf, &cache->item,
btrfs_item_ptr_offset(leaf, path->slots[0]),
sizeof(cache->item));
key.objectid = found_key.objectid + found_key.offset;
btrfs_release_path(root, path);
cache->flags = btrfs_block_group_flags(&cache->item);
- bit = 0;
- if (cache->flags & BTRFS_BLOCK_GROUP_DATA) {
- bit = BLOCK_GROUP_DATA;
- } else if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) {
- bit = BLOCK_GROUP_SYSTEM;
- } else if (cache->flags & BTRFS_BLOCK_GROUP_METADATA) {
- bit = BLOCK_GROUP_METADATA;
- }
- set_avail_alloc_bits(info, cache->flags);
ret = update_space_info(info, cache->flags, found_key.offset,
btrfs_block_group_used(&cache->item),
&space_info);
BUG_ON(ret);
cache->space_info = space_info;
+ spin_lock(&space_info->lock);
+ list_add(&cache->list, &space_info->block_groups);
+ spin_unlock(&space_info->lock);
- /* use EXTENT_LOCKED to prevent merging */
- set_extent_bits(block_group_cache, found_key.objectid,
- found_key.objectid + found_key.offset - 1,
- bit | EXTENT_LOCKED, GFP_NOFS);
- set_state_private(block_group_cache, found_key.objectid,
- (unsigned long)cache);
+ ret = btrfs_add_block_group_cache(root->fs_info, cache);
+ BUG_ON(ret);
if (key.objectid >=
btrfs_super_total_bytes(&info->super_copy))
ret = 0;
error:
btrfs_free_path(path);
+ mutex_unlock(&root->fs_info->alloc_mutex);
return ret;
}
u64 size)
{
int ret;
- int bit = 0;
struct btrfs_root *extent_root;
struct btrfs_block_group_cache *cache;
- struct extent_io_tree *block_group_cache;
+ WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex));
extent_root = root->fs_info->extent_root;
- block_group_cache = &root->fs_info->block_group_cache;
+
+ root->fs_info->last_trans_new_blockgroup = trans->transid;
cache = kzalloc(sizeof(*cache), GFP_NOFS);
- BUG_ON(!cache);
+ if (!cache)
+ return -ENOMEM;
+
cache->key.objectid = chunk_offset;
cache->key.offset = size;
+ spin_lock_init(&cache->lock);
+ INIT_LIST_HEAD(&cache->list);
btrfs_set_key_type(&cache->key, BTRFS_BLOCK_GROUP_ITEM_KEY);
btrfs_set_block_group_used(&cache->item, bytes_used);
ret = update_space_info(root->fs_info, cache->flags, size, bytes_used,
&cache->space_info);
BUG_ON(ret);
+ spin_lock(&cache->space_info->lock);
+ list_add(&cache->list, &cache->space_info->block_groups);
+ spin_unlock(&cache->space_info->lock);
- bit = block_group_state_bits(type);
- set_extent_bits(block_group_cache, chunk_offset,
- chunk_offset + size - 1,
- bit | EXTENT_LOCKED, GFP_NOFS);
+ ret = btrfs_add_block_group_cache(root->fs_info, cache);
+ BUG_ON(ret);
- set_state_private(block_group_cache, chunk_offset,
- (unsigned long)cache);
ret = btrfs_insert_item(trans, extent_root, &cache->key, &cache->item,
sizeof(cache->item));
BUG_ON(ret);
ret = del_pending_extents(trans, extent_root);
BUG_ON(ret);
set_avail_alloc_bits(extent_root->fs_info, type);
+
return 0;
}
projects / linux-2.6-block.git / blobdiff