summaryrefslogtreecommitdiffstats
path: root/fs/btrfs/extent-tree.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/btrfs/extent-tree.c')
-rw-r--r--fs/btrfs/extent-tree.c1581
1 files changed, 1108 insertions, 473 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 9c01509dd8ab..caaf015d6e4b 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -26,15 +26,16 @@
#include <linux/ratelimit.h>
#include <linux/percpu_counter.h>
#include "hash.h"
-#include "ctree.h"
+#include "tree-log.h"
#include "disk-io.h"
#include "print-tree.h"
-#include "transaction.h"
#include "volumes.h"
#include "raid56.h"
#include "locking.h"
#include "free-space-cache.h"
#include "math.h"
+#include "sysfs.h"
+#include "qgroup.h"
#undef SCRAMBLE_DELAYED_REFS
@@ -80,7 +81,8 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
u64 bytenr, u64 num_bytes, u64 parent,
u64 root_objectid, u64 owner_objectid,
u64 owner_offset, int refs_to_drop,
- struct btrfs_delayed_extent_op *extra_op);
+ struct btrfs_delayed_extent_op *extra_op,
+ int no_quota);
static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op,
struct extent_buffer *leaf,
struct btrfs_extent_item *ei);
@@ -93,7 +95,8 @@ static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 parent, u64 root_objectid,
u64 flags, struct btrfs_disk_key *key,
- int level, struct btrfs_key *ins);
+ int level, struct btrfs_key *ins,
+ int no_quota);
static int do_chunk_alloc(struct btrfs_trans_handle *trans,
struct btrfs_root *extent_root, u64 flags,
int force);
@@ -102,7 +105,8 @@ static int find_next_key(struct btrfs_path *path, int level,
static void dump_space_info(struct btrfs_space_info *info, u64 bytes,
int dump_block_groups);
static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache,
- u64 num_bytes, int reserve);
+ u64 num_bytes, int reserve,
+ int delalloc);
static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv,
u64 num_bytes);
int btrfs_pin_extent(struct btrfs_root *root,
@@ -418,7 +422,7 @@ static noinline void caching_thread(struct btrfs_work *work)
again:
mutex_lock(&caching_ctl->mutex);
/* need to make sure the commit_root doesn't disappear */
- down_read(&fs_info->extent_commit_sem);
+ down_read(&fs_info->commit_root_sem);
next:
ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
@@ -441,10 +445,11 @@ next:
if (ret)
break;
- if (need_resched()) {
+ if (need_resched() ||
+ rwsem_is_contended(&fs_info->commit_root_sem)) {
caching_ctl->progress = last;
btrfs_release_path(path);
- up_read(&fs_info->extent_commit_sem);
+ up_read(&fs_info->commit_root_sem);
mutex_unlock(&caching_ctl->mutex);
cond_resched();
goto again;
@@ -511,7 +516,7 @@ next:
err:
btrfs_free_path(path);
- up_read(&fs_info->extent_commit_sem);
+ up_read(&fs_info->commit_root_sem);
free_excluded_extents(extent_root, block_group);
@@ -547,7 +552,8 @@ static int cache_block_group(struct btrfs_block_group_cache *cache,
caching_ctl->block_group = cache;
caching_ctl->progress = cache->key.objectid;
atomic_set(&caching_ctl->count, 1);
- caching_ctl->work.func = caching_thread;
+ btrfs_init_work(&caching_ctl->work, btrfs_cache_helper,
+ caching_thread, NULL, NULL);
spin_lock(&cache->lock);
/*
@@ -631,14 +637,14 @@ static int cache_block_group(struct btrfs_block_group_cache *cache,
return 0;
}
- down_write(&fs_info->extent_commit_sem);
+ down_write(&fs_info->commit_root_sem);
atomic_inc(&caching_ctl->count);
list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups);
- up_write(&fs_info->extent_commit_sem);
+ up_write(&fs_info->commit_root_sem);
btrfs_get_block_group(cache);
- btrfs_queue_worker(&fs_info->caching_workers, &caching_ctl->work);
+ btrfs_queue_work(fs_info->caching_workers, &caching_ctl->work);
return ret;
}
@@ -855,12 +861,14 @@ again:
btrfs_put_delayed_ref(&head->node);
goto search_again;
}
+ spin_lock(&head->lock);
if (head->extent_op && head->extent_op->update_flags)
extent_flags |= head->extent_op->flags_to_set;
else
BUG_ON(num_refs == 0);
num_refs += head->node.ref_mod;
+ spin_unlock(&head->lock);
mutex_unlock(&head->mutex);
}
spin_unlock(&delayed_refs->lock);
@@ -1070,11 +1078,11 @@ static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset)
__le64 lenum;
lenum = cpu_to_le64(root_objectid);
- high_crc = crc32c(high_crc, &lenum, sizeof(lenum));
+ high_crc = btrfs_crc32c(high_crc, &lenum, sizeof(lenum));
lenum = cpu_to_le64(owner);
- low_crc = crc32c(low_crc, &lenum, sizeof(lenum));
+ low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum));
lenum = cpu_to_le64(offset);
- low_crc = crc32c(low_crc, &lenum, sizeof(lenum));
+ low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum));
return ((u64)high_crc << 31) ^ (u64)low_crc;
}
@@ -1267,7 +1275,7 @@ fail:
static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
- int refs_to_drop)
+ int refs_to_drop, int *last_ref)
{
struct btrfs_key key;
struct btrfs_extent_data_ref *ref1 = NULL;
@@ -1303,6 +1311,7 @@ static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans,
if (num_refs == 0) {
ret = btrfs_del_item(trans, root, path);
+ *last_ref = 1;
} else {
if (key.type == BTRFS_EXTENT_DATA_REF_KEY)
btrfs_set_extent_data_ref_count(leaf, ref1, num_refs);
@@ -1538,6 +1547,7 @@ again:
ret = 0;
}
if (ret) {
+ key.objectid = bytenr;
key.type = BTRFS_EXTENT_ITEM_KEY;
key.offset = num_bytes;
btrfs_release_path(path);
@@ -1759,7 +1769,8 @@ void update_inline_extent_backref(struct btrfs_root *root,
struct btrfs_path *path,
struct btrfs_extent_inline_ref *iref,
int refs_to_mod,
- struct btrfs_delayed_extent_op *extent_op)
+ struct btrfs_delayed_extent_op *extent_op,
+ int *last_ref)
{
struct extent_buffer *leaf;
struct btrfs_extent_item *ei;
@@ -1803,6 +1814,7 @@ void update_inline_extent_backref(struct btrfs_root *root,
else
btrfs_set_shared_data_ref_count(leaf, sref, refs);
} else {
+ *last_ref = 1;
size = btrfs_extent_inline_ref_size(type);
item_size = btrfs_item_size_nr(leaf, path->slots[0]);
ptr = (unsigned long)iref;
@@ -1834,7 +1846,7 @@ int insert_inline_extent_backref(struct btrfs_trans_handle *trans,
if (ret == 0) {
BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID);
update_inline_extent_backref(root, path, iref,
- refs_to_add, extent_op);
+ refs_to_add, extent_op, NULL);
} else if (ret == -ENOENT) {
setup_inline_extent_backref(root, path, iref, parent,
root_objectid, owner, offset,
@@ -1867,17 +1879,19 @@ static int remove_extent_backref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
struct btrfs_extent_inline_ref *iref,
- int refs_to_drop, int is_data)
+ int refs_to_drop, int is_data, int *last_ref)
{
int ret = 0;
BUG_ON(!is_data && refs_to_drop != 1);
if (iref) {
update_inline_extent_backref(root, path, iref,
- -refs_to_drop, NULL);
+ -refs_to_drop, NULL, last_ref);
} else if (is_data) {
- ret = remove_extent_data_ref(trans, root, path, refs_to_drop);
+ ret = remove_extent_data_ref(trans, root, path, refs_to_drop,
+ last_ref);
} else {
+ *last_ref = 1;
ret = btrfs_del_item(trans, root, path);
}
return ret;
@@ -1941,7 +1955,8 @@ static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr,
int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 bytenr, u64 num_bytes, u64 parent,
- u64 root_objectid, u64 owner, u64 offset, int for_cow)
+ u64 root_objectid, u64 owner, u64 offset,
+ int no_quota)
{
int ret;
struct btrfs_fs_info *fs_info = root->fs_info;
@@ -1953,12 +1968,12 @@ int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr,
num_bytes,
parent, root_objectid, (int)owner,
- BTRFS_ADD_DELAYED_REF, NULL, for_cow);
+ BTRFS_ADD_DELAYED_REF, NULL, no_quota);
} else {
ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr,
num_bytes,
parent, root_objectid, owner, offset,
- BTRFS_ADD_DELAYED_REF, NULL, for_cow);
+ BTRFS_ADD_DELAYED_REF, NULL, no_quota);
}
return ret;
}
@@ -1968,31 +1983,64 @@ static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
u64 bytenr, u64 num_bytes,
u64 parent, u64 root_objectid,
u64 owner, u64 offset, int refs_to_add,
+ int no_quota,
struct btrfs_delayed_extent_op *extent_op)
{
+ struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_path *path;
struct extent_buffer *leaf;
struct btrfs_extent_item *item;
+ struct btrfs_key key;
u64 refs;
int ret;
+ enum btrfs_qgroup_operation_type type = BTRFS_QGROUP_OPER_ADD_EXCL;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
+ if (!is_fstree(root_objectid) || !root->fs_info->quota_enabled)
+ no_quota = 1;
+
path->reada = 1;
path->leave_spinning = 1;
/* this will setup the path even if it fails to insert the back ref */
- ret = insert_inline_extent_backref(trans, root->fs_info->extent_root,
- path, bytenr, num_bytes, parent,
+ ret = insert_inline_extent_backref(trans, fs_info->extent_root, path,
+ bytenr, num_bytes, parent,
root_objectid, owner, offset,
refs_to_add, extent_op);
- if (ret != -EAGAIN)
+ if ((ret < 0 && ret != -EAGAIN) || (!ret && no_quota))
goto out;
+ /*
+ * Ok we were able to insert an inline extent and it appears to be a new
+ * reference, deal with the qgroup accounting.
+ */
+ if (!ret && !no_quota) {
+ ASSERT(root->fs_info->quota_enabled);
+ leaf = path->nodes[0];
+ btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
+ item = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_extent_item);
+ if (btrfs_extent_refs(leaf, item) > (u64)refs_to_add)
+ type = BTRFS_QGROUP_OPER_ADD_SHARED;
+ btrfs_release_path(path);
+ ret = btrfs_qgroup_record_ref(trans, fs_info, root_objectid,
+ bytenr, num_bytes, type, 0);
+ goto out;
+ }
+
+ /*
+ * Ok we had -EAGAIN which means we didn't have space to insert and
+ * inline extent ref, so just update the reference count and add a
+ * normal backref.
+ */
leaf = path->nodes[0];
+ btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
refs = btrfs_extent_refs(leaf, item);
+ if (refs)
+ type = BTRFS_QGROUP_OPER_ADD_SHARED;
btrfs_set_extent_refs(leaf, item, refs + refs_to_add);
if (extent_op)
__run_delayed_extent_op(extent_op, leaf, item);
@@ -2000,9 +2048,15 @@ static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
btrfs_mark_buffer_dirty(leaf);
btrfs_release_path(path);
+ if (!no_quota) {
+ ret = btrfs_qgroup_record_ref(trans, fs_info, root_objectid,
+ bytenr, num_bytes, type, 0);
+ if (ret)
+ goto out;
+ }
+
path->reada = 1;
path->leave_spinning = 1;
-
/* now insert the actual backref */
ret = insert_extent_backref(trans, root->fs_info->extent_root,
path, bytenr, parent, root_objectid,
@@ -2036,8 +2090,7 @@ static int run_delayed_data_ref(struct btrfs_trans_handle *trans,
if (node->type == BTRFS_SHARED_DATA_REF_KEY)
parent = ref->parent;
- else
- ref_root = ref->root;
+ ref_root = ref->root;
if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) {
if (extent_op)
@@ -2051,13 +2104,13 @@ static int run_delayed_data_ref(struct btrfs_trans_handle *trans,
node->num_bytes, parent,
ref_root, ref->objectid,
ref->offset, node->ref_mod,
- extent_op);
+ node->no_quota, extent_op);
} else if (node->action == BTRFS_DROP_DELAYED_REF) {
ret = __btrfs_free_extent(trans, root, node->bytenr,
node->num_bytes, parent,
ref_root, ref->objectid,
ref->offset, node->ref_mod,
- extent_op);
+ extent_op, node->no_quota);
} else {
BUG();
}
@@ -2194,8 +2247,7 @@ static int run_delayed_tree_ref(struct btrfs_trans_handle *trans,
if (node->type == BTRFS_SHARED_BLOCK_REF_KEY)
parent = ref->parent;
- else
- ref_root = ref->root;
+ ref_root = ref->root;
ins.objectid = node->bytenr;
if (skinny_metadata) {
@@ -2213,15 +2265,18 @@ static int run_delayed_tree_ref(struct btrfs_trans_handle *trans,
parent, ref_root,
extent_op->flags_to_set,
&extent_op->key,
- ref->level, &ins);
+ ref->level, &ins,
+ node->no_quota);
} else if (node->action == BTRFS_ADD_DELAYED_REF) {
ret = __btrfs_inc_extent_ref(trans, root, node->bytenr,
node->num_bytes, parent, ref_root,
- ref->level, 0, 1, extent_op);
+ ref->level, 0, 1, node->no_quota,
+ extent_op);
} else if (node->action == BTRFS_DROP_DELAYED_REF) {
ret = __btrfs_free_extent(trans, root, node->bytenr,
node->num_bytes, parent, ref_root,
- ref->level, 0, 1, extent_op);
+ ref->level, 0, 1, extent_op,
+ node->no_quota);
} else {
BUG();
}
@@ -2285,64 +2340,62 @@ static noinline struct btrfs_delayed_ref_node *
select_delayed_ref(struct btrfs_delayed_ref_head *head)
{
struct rb_node *node;
- struct btrfs_delayed_ref_node *ref;
- int action = BTRFS_ADD_DELAYED_REF;
-again:
+ struct btrfs_delayed_ref_node *ref, *last = NULL;;
+
/*
* select delayed ref of type BTRFS_ADD_DELAYED_REF first.
* this prevents ref count from going down to zero when
* there still are pending delayed ref.
*/
- node = rb_prev(&head->node.rb_node);
- while (1) {
- if (!node)
- break;
+ node = rb_first(&head->ref_root);
+ while (node) {
ref = rb_entry(node, struct btrfs_delayed_ref_node,
rb_node);
- if (ref->bytenr != head->node.bytenr)
- break;
- if (ref->action == action)
+ if (ref->action == BTRFS_ADD_DELAYED_REF)
return ref;
- node = rb_prev(node);
+ else if (last == NULL)
+ last = ref;
+ node = rb_next(node);
}
- if (action == BTRFS_ADD_DELAYED_REF) {
- action = BTRFS_DROP_DELAYED_REF;
- goto again;
- }
- return NULL;
+ return last;
}
/*
* Returns 0 on success or if called with an already aborted transaction.
* Returns -ENOMEM or -EIO on failure and will abort the transaction.
*/
-static noinline int run_clustered_refs(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct list_head *cluster)
+static noinline int __btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ unsigned long nr)
{
struct btrfs_delayed_ref_root *delayed_refs;
struct btrfs_delayed_ref_node *ref;
struct btrfs_delayed_ref_head *locked_ref = NULL;
struct btrfs_delayed_extent_op *extent_op;
struct btrfs_fs_info *fs_info = root->fs_info;
+ ktime_t start = ktime_get();
int ret;
- int count = 0;
+ unsigned long count = 0;
+ unsigned long actual_count = 0;
int must_insert_reserved = 0;
delayed_refs = &trans->transaction->delayed_refs;
while (1) {
if (!locked_ref) {
- /* pick a new head ref from the cluster list */
- if (list_empty(cluster))
+ if (count >= nr)
break;
- locked_ref = list_entry(cluster->next,
- struct btrfs_delayed_ref_head, cluster);
+ spin_lock(&delayed_refs->lock);
+ locked_ref = btrfs_select_ref_head(trans);
+ if (!locked_ref) {
+ spin_unlock(&delayed_refs->lock);
+ break;
+ }
/* grab the lock that says we are going to process
* all the refs for this head */
ret = btrfs_delayed_ref_lock(trans, locked_ref);
-
+ spin_unlock(&delayed_refs->lock);
/*
* we may have dropped the spin lock to get the head
* mutex lock, and that might have given someone else
@@ -2363,6 +2416,7 @@ static noinline int run_clustered_refs(struct btrfs_trans_handle *trans,
* finish. If we merged anything we need to re-loop so we can
* get a good ref.
*/
+ spin_lock(&locked_ref->lock);
btrfs_merge_delayed_refs(trans, fs_info, delayed_refs,
locked_ref);
@@ -2374,17 +2428,15 @@ static noinline int run_clustered_refs(struct btrfs_trans_handle *trans,
if (ref && ref->seq &&
btrfs_check_delayed_seq(fs_info, delayed_refs, ref->seq)) {
- /*
- * there are still refs with lower seq numbers in the
- * process of being added. Don't run this ref yet.
- */
- list_del_init(&locked_ref->cluster);
+ spin_unlock(&locked_ref->lock);
btrfs_delayed_ref_unlock(locked_ref);
- locked_ref = NULL;
+ spin_lock(&delayed_refs->lock);
+ locked_ref->processing = 0;
delayed_refs->num_heads_ready++;
spin_unlock(&delayed_refs->lock);
+ locked_ref = NULL;
cond_resched();
- spin_lock(&delayed_refs->lock);
+ count++;
continue;
}
@@ -2399,6 +2451,8 @@ static noinline int run_clustered_refs(struct btrfs_trans_handle *trans,
locked_ref->extent_op = NULL;
if (!ref) {
+
+
/* All delayed refs have been processed, Go ahead
* and send the head node to run_one_delayed_ref,
* so that any accounting fixes can happen
@@ -2411,8 +2465,7 @@ static noinline int run_clustered_refs(struct btrfs_trans_handle *trans,
}
if (extent_op) {
- spin_unlock(&delayed_refs->lock);
-
+ spin_unlock(&locked_ref->lock);
ret = run_delayed_extent_op(trans, root,
ref, extent_op);
btrfs_free_delayed_extent_op(extent_op);
@@ -2426,19 +2479,40 @@ static noinline int run_clustered_refs(struct btrfs_trans_handle *trans,
*/
if (must_insert_reserved)
locked_ref->must_insert_reserved = 1;
+ locked_ref->processing = 0;
btrfs_debug(fs_info, "run_delayed_extent_op returned %d", ret);
- spin_lock(&delayed_refs->lock);
btrfs_delayed_ref_unlock(locked_ref);
return ret;
}
+ continue;
+ }
- goto next;
+ /*
+ * Need to drop our head ref lock and re-aqcuire the
+ * delayed ref lock and then re-check to make sure
+ * nobody got added.
+ */
+ spin_unlock(&locked_ref->lock);
+ spin_lock(&delayed_refs->lock);
+ spin_lock(&locked_ref->lock);
+ if (rb_first(&locked_ref->ref_root) ||
+ locked_ref->extent_op) {
+ spin_unlock(&locked_ref->lock);
+ spin_unlock(&delayed_refs->lock);
+ continue;
}
+ ref->in_tree = 0;
+ delayed_refs->num_heads--;
+ rb_erase(&locked_ref->href_node,
+ &delayed_refs->href_root);
+ spin_unlock(&delayed_refs->lock);
+ } else {
+ actual_count++;
+ ref->in_tree = 0;
+ rb_erase(&ref->rb_node, &locked_ref->ref_root);
}
+ atomic_dec(&delayed_refs->num_entries);
- ref->in_tree = 0;
- rb_erase(&ref->rb_node, &delayed_refs->root);
- delayed_refs->num_entries--;
if (!btrfs_delayed_ref_is_head(ref)) {
/*
* when we play the delayed ref, also correct the
@@ -2455,20 +2529,18 @@ static noinline int run_clustered_refs(struct btrfs_trans_handle *trans,
default:
WARN_ON(1);
}
- } else {
- list_del_init(&locked_ref->cluster);
}
- spin_unlock(&delayed_refs->lock);
+ spin_unlock(&locked_ref->lock);
ret = run_one_delayed_ref(trans, root, ref, extent_op,
must_insert_reserved);
btrfs_free_delayed_extent_op(extent_op);
if (ret) {
+ locked_ref->processing = 0;
btrfs_delayed_ref_unlock(locked_ref);
btrfs_put_delayed_ref(ref);
btrfs_debug(fs_info, "run_one_delayed_ref returned %d", ret);
- spin_lock(&delayed_refs->lock);
return ret;
}
@@ -2484,11 +2556,29 @@ static noinline int run_clustered_refs(struct btrfs_trans_handle *trans,
}
btrfs_put_delayed_ref(ref);
count++;
-next:
cond_resched();
+ }
+
+ /*
+ * We don't want to include ref heads since we can have empty ref heads
+ * and those will drastically skew our runtime down since we just do
+ * accounting, no actual extent tree updates.
+ */
+ if (actual_count > 0) {
+ u64 runtime = ktime_to_ns(ktime_sub(ktime_get(), start));
+ u64 avg;
+
+ /*
+ * We weigh the current average higher than our current runtime
+ * to avoid large swings in the average.
+ */
spin_lock(&delayed_refs->lock);
+ avg = fs_info->avg_delayed_ref_runtime * 3 + runtime;
+ avg = div64_u64(avg, 4);
+ fs_info->avg_delayed_ref_runtime = avg;
+ spin_unlock(&delayed_refs->lock);
}
- return count;
+ return 0;
}
#ifdef SCRAMBLE_DELAYED_REFS
@@ -2534,52 +2624,6 @@ static u64 find_middle(struct rb_root *root)
}
#endif
-int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
- struct btrfs_fs_info *fs_info)
-{
- struct qgroup_update *qgroup_update;
- int ret = 0;
-
- if (list_empty(&trans->qgroup_ref_list) !=
- !trans->delayed_ref_elem.seq) {
- /* list without seq or seq without list */
- btrfs_err(fs_info,
- "qgroup accounting update error, list is%s empty, seq is %#x.%x",
- list_empty(&trans->qgroup_ref_list) ? "" : " not",
- (u32)(trans->delayed_ref_elem.seq >> 32),
- (u32)trans->delayed_ref_elem.seq);
- BUG();
- }
-
- if (!trans->delayed_ref_elem.seq)
- return 0;
-
- while (!list_empty(&trans->qgroup_ref_list)) {
- qgroup_update = list_first_entry(&trans->qgroup_ref_list,
- struct qgroup_update, list);
- list_del(&qgroup_update->list);
- if (!ret)
- ret = btrfs_qgroup_account_ref(
- trans, fs_info, qgroup_update->node,
- qgroup_update->extent_op);
- kfree(qgroup_update);
- }
-
- btrfs_put_tree_mod_seq(fs_info, &trans->delayed_ref_elem);
-
- return ret;
-}
-
-static int refs_newer(struct btrfs_delayed_ref_root *delayed_refs, int seq,
- int count)
-{
- int val = atomic_read(&delayed_refs->ref_seq);
-
- if (val < seq || val >= seq + count)
- return 1;
- return 0;
-}
-
static inline u64 heads_to_leaves(struct btrfs_root *root, u64 heads)
{
u64 num_bytes;
@@ -2596,7 +2640,7 @@ static inline u64 heads_to_leaves(struct btrfs_root *root, u64 heads)
return div64_u64(num_bytes, BTRFS_LEAF_DATA_SIZE(root));
}
-int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans,
+int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
struct btrfs_block_rsv *global_rsv;
@@ -2625,6 +2669,101 @@ int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans,
return ret;
}
+int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root)
+{
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ u64 num_entries =
+ atomic_read(&trans->transaction->delayed_refs.num_entries);
+ u64 avg_runtime;
+ u64 val;
+
+ smp_mb();
+ avg_runtime = fs_info->avg_delayed_ref_runtime;
+ val = num_entries * avg_runtime;
+ if (num_entries * avg_runtime >= NSEC_PER_SEC)
+ return 1;
+ if (val >= NSEC_PER_SEC / 2)
+ return 2;
+
+ return btrfs_check_space_for_delayed_refs(trans, root);
+}
+
+struct async_delayed_refs {
+ struct btrfs_root *root;
+ int count;
+ int error;
+ int sync;
+ struct completion wait;
+ struct btrfs_work work;
+};
+
+static void delayed_ref_async_start(struct btrfs_work *work)
+{
+ struct async_delayed_refs *async;
+ struct btrfs_trans_handle *trans;
+ int ret;
+
+ async = container_of(work, struct async_delayed_refs, work);
+
+ trans = btrfs_join_transaction(async->root);
+ if (IS_ERR(trans)) {
+ async->error = PTR_ERR(trans);
+ goto done;
+ }
+
+ /*
+ * trans->sync means that when we call end_transaciton, we won't
+ * wait on delayed refs
+ */
+ trans->sync = true;
+ ret = btrfs_run_delayed_refs(trans, async->root, async->count);
+ if (ret)
+ async->error = ret;
+
+ ret = btrfs_end_transaction(trans, async->root);
+ if (ret && !async->error)
+ async->error = ret;
+done:
+ if (async->sync)
+ complete(&async->wait);
+ else
+ kfree(async);
+}
+
+int btrfs_async_run_delayed_refs(struct btrfs_root *root,
+ unsigned long count, int wait)
+{
+ struct async_delayed_refs *async;
+ int ret;
+
+ async = kmalloc(sizeof(*async), GFP_NOFS);
+ if (!async)
+ return -ENOMEM;
+
+ async->root = root->fs_info->tree_root;
+ async->count = count;
+ async->error = 0;
+ if (wait)
+ async->sync = 1;
+ else
+ async->sync = 0;
+ init_completion(&async->wait);
+
+ btrfs_init_work(&async->work, btrfs_extent_refs_helper,
+ delayed_ref_async_start, NULL, NULL);
+
+ btrfs_queue_work(root->fs_info->extent_workers, &async->work);
+
+ if (wait) {
+ wait_for_completion(&async->wait);
+ ret = async->error;
+ kfree(async);
+ return ret;
+ }
+ return 0;
+}
+
/*
* this starts processing the delayed reference count updates and
* extent insertions we have queued up so far. count can be
@@ -2640,13 +2779,10 @@ int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
{
struct rb_node *node;
struct btrfs_delayed_ref_root *delayed_refs;
- struct btrfs_delayed_ref_node *ref;
- struct list_head cluster;
+ struct btrfs_delayed_ref_head *head;
int ret;
- u64 delayed_start;
int run_all = count == (unsigned long)-1;
int run_most = 0;
- int loops;
/* We'll clean this up in btrfs_cleanup_transaction */
if (trans->aborted)
@@ -2655,133 +2791,41 @@ int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
if (root == root->fs_info->extent_root)
root = root->fs_info->tree_root;
- btrfs_delayed_refs_qgroup_accounting(trans, root->fs_info);
-
delayed_refs = &trans->transaction->delayed_refs;
- INIT_LIST_HEAD(&cluster);
if (count == 0) {
- count = delayed_refs->num_entries * 2;
+ count = atomic_read(&delayed_refs->num_entries) * 2;
run_most = 1;
}
- if (!run_all && !run_most) {
- int old;
- int seq = atomic_read(&delayed_refs->ref_seq);
-
-progress:
- old = atomic_cmpxchg(&delayed_refs->procs_running_refs, 0, 1);
- if (old) {
- DEFINE_WAIT(__wait);
- if (delayed_refs->flushing ||
- !btrfs_should_throttle_delayed_refs(trans, root))
- return 0;
-
- prepare_to_wait(&delayed_refs->wait, &__wait,
- TASK_UNINTERRUPTIBLE);
-
- old = atomic_cmpxchg(&delayed_refs->procs_running_refs, 0, 1);
- if (old) {
- schedule();
- finish_wait(&delayed_refs->wait, &__wait);
-
- if (!refs_newer(delayed_refs, seq, 256))
- goto progress;
- else
- return 0;
- } else {
- finish_wait(&delayed_refs->wait, &__wait);
- goto again;
- }
- }
-
- } else {
- atomic_inc(&delayed_refs->procs_running_refs);
- }
-
again:
- loops = 0;
- spin_lock(&delayed_refs->lock);
-
#ifdef SCRAMBLE_DELAYED_REFS
delayed_refs->run_delayed_start = find_middle(&delayed_refs->root);
#endif
-
- while (1) {
- if (!(run_all || run_most) &&
- !btrfs_should_throttle_delayed_refs(trans, root))
- break;
-
- /*
- * go find something we can process in the rbtree. We start at
- * the beginning of the tree, and then build a cluster
- * of refs to process starting at the first one we are able to
- * lock
- */
- delayed_start = delayed_refs->run_delayed_start;
- ret = btrfs_find_ref_cluster(trans, &cluster,
- delayed_refs->run_delayed_start);
- if (ret)
- break;
-
- ret = run_clustered_refs(trans, root, &cluster);
- if (ret < 0) {
- btrfs_release_ref_cluster(&cluster);
- spin_unlock(&delayed_refs->lock);
- btrfs_abort_transaction(trans, root, ret);
- atomic_dec(&delayed_refs->procs_running_refs);
- wake_up(&delayed_refs->wait);
- return ret;
- }
-
- atomic_add(ret, &delayed_refs->ref_seq);
-
- count -= min_t(unsigned long, ret, count);
-
- if (count == 0)
- break;
-
- if (delayed_start >= delayed_refs->run_delayed_start) {
- if (loops == 0) {
- /*
- * btrfs_find_ref_cluster looped. let's do one
- * more cycle. if we don't run any delayed ref
- * during that cycle (because we can't because
- * all of them are blocked), bail out.
- */
- loops = 1;
- } else {
- /*
- * no runnable refs left, stop trying
- */
- BUG_ON(run_all);
- break;
- }
- }
- if (ret) {
- /* refs were run, let's reset staleness detection */
- loops = 0;
- }
+ ret = __btrfs_run_delayed_refs(trans, root, count);
+ if (ret < 0) {
+ btrfs_abort_transaction(trans, root, ret);
+ return ret;
}
if (run_all) {
- if (!list_empty(&trans->new_bgs)) {
- spin_unlock(&delayed_refs->lock);
+ if (!list_empty(&trans->new_bgs))
btrfs_create_pending_block_groups(trans, root);
- spin_lock(&delayed_refs->lock);
- }
- node = rb_first(&delayed_refs->root);
- if (!node)
+ spin_lock(&delayed_refs->lock);
+ node = rb_first(&delayed_refs->href_root);
+ if (!node) {
+ spin_unlock(&delayed_refs->lock);
goto out;
+ }
count = (unsigned long)-1;
while (node) {
- ref = rb_entry(node, struct btrfs_delayed_ref_node,
- rb_node);
- if (btrfs_delayed_ref_is_head(ref)) {
- struct btrfs_delayed_ref_head *head;
+ head = rb_entry(node, struct btrfs_delayed_ref_head,
+ href_node);
+ if (btrfs_delayed_ref_is_head(&head->node)) {
+ struct btrfs_delayed_ref_node *ref;
- head = btrfs_delayed_node_to_head(ref);
+ ref = &head->node;
atomic_inc(&ref->refs);
spin_unlock(&delayed_refs->lock);
@@ -2795,20 +2839,19 @@ again:
btrfs_put_delayed_ref(ref);
cond_resched();
goto again;
+ } else {
+ WARN_ON(1);
}
node = rb_next(node);
}
spin_unlock(&delayed_refs->lock);
- schedule_timeout(1);
+ cond_resched();
goto again;
}
out:
- atomic_dec(&delayed_refs->procs_running_refs);
- smp_mb();
- if (waitqueue_active(&delayed_refs->wait))
- wake_up(&delayed_refs->wait);
-
- spin_unlock(&delayed_refs->lock);
+ ret = btrfs_delayed_qgroup_accounting(trans, root->fs_info);
+ if (ret)
+ return ret;
assert_qgroups_uptodate(trans);
return 0;
}
@@ -2850,12 +2893,13 @@ static noinline int check_delayed_ref(struct btrfs_trans_handle *trans,
struct rb_node *node;
int ret = 0;
- ret = -ENOENT;
delayed_refs = &trans->transaction->delayed_refs;
spin_lock(&delayed_refs->lock);
head = btrfs_find_delayed_ref_head(trans, bytenr);
- if (!head)
- goto out;
+ if (!head) {
+ spin_unlock(&delayed_refs->lock);
+ return 0;
+ }
if (!mutex_trylock(&head->mutex)) {
atomic_inc(&head->node.refs);
@@ -2872,40 +2916,35 @@ static noinline int check_delayed_ref(struct btrfs_trans_handle *trans,
btrfs_put_delayed_ref(&head->node);
return -EAGAIN;
}
+ spin_unlock(&delayed_refs->lock);
- node = rb_prev(&head->node.rb_node);
- if (!node)
- goto out_unlock;
-
- ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node);
-
- if (ref->bytenr != bytenr)
- goto out_unlock;
-
- ret = 1;
- if (ref->type != BTRFS_EXTENT_DATA_REF_KEY)
- goto out_unlock;
+ spin_lock(&head->lock);
+ node = rb_first(&head->ref_root);
+ while (node) {
+ ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node);
+ node = rb_next(node);
- data_ref = btrfs_delayed_node_to_data_ref(ref);
+ /* If it's a shared ref we know a cross reference exists */
+ if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) {
+ ret = 1;
+ break;
+ }
- node = rb_prev(node);
- if (node) {
- int seq = ref->seq;
+ data_ref = btrfs_delayed_node_to_data_ref(ref);
- ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node);
- if (ref->bytenr == bytenr && ref->seq == seq)
- goto out_unlock;
+ /*
+ * If our ref doesn't match the one we're currently looking at
+ * then we have a cross reference.
+ */
+ if (data_ref->root != root->root_key.objectid ||
+ data_ref->objectid != objectid ||
+ data_ref->offset != offset) {
+ ret = 1;
+ break;
+ }
}
-
- if (data_ref->root != root->root_key.objectid ||
- data_ref->objectid != objectid || data_ref->offset != offset)
- goto out_unlock;
-
- ret = 0;
-out_unlock:
+ spin_unlock(&head->lock);
mutex_unlock(&head->mutex);
-out:
- spin_unlock(&delayed_refs->lock);
return ret;
}
@@ -3019,7 +3058,7 @@ out:
static int __btrfs_mod_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct extent_buffer *buf,
- int full_backref, int inc, int for_cow)
+ int full_backref, int inc)
{
u64 bytenr;
u64 num_bytes;
@@ -3034,11 +3073,15 @@ static int __btrfs_mod_ref(struct btrfs_trans_handle *trans,
int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *,
u64, u64, u64, u64, u64, u64, int);
+#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
+ if (unlikely(test_bit(BTRFS_ROOT_DUMMY_ROOT, &root->state)))
+ return 0;
+#endif
ref_root = btrfs_header_owner(buf);
nritems = btrfs_header_nritems(buf);
level = btrfs_header_level(buf);
- if (!root->ref_cows && level == 0)
+ if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state) && level == 0)
return 0;
if (inc)
@@ -3069,7 +3112,7 @@ static int __btrfs_mod_ref(struct btrfs_trans_handle *trans,
key.offset -= btrfs_file_extent_offset(buf, fi);
ret = process_func(trans, root, bytenr, num_bytes,
parent, ref_root, key.objectid,
- key.offset, for_cow);
+ key.offset, 1);
if (ret)
goto fail;
} else {
@@ -3077,7 +3120,7 @@ static int __btrfs_mod_ref(struct btrfs_trans_handle *trans,
num_bytes = btrfs_level_size(root, level - 1);
ret = process_func(trans, root, bytenr, num_bytes,
parent, ref_root, level - 1, 0,
- for_cow);
+ 1);
if (ret)
goto fail;
}
@@ -3088,15 +3131,15 @@ fail:
}
int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
- struct extent_buffer *buf, int full_backref, int for_cow)
+ struct extent_buffer *buf, int full_backref)
{
- return __btrfs_mod_ref(trans, root, buf, full_backref, 1, for_cow);
+ return __btrfs_mod_ref(trans, root, buf, full_backref, 1);
}
int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
- struct extent_buffer *buf, int full_backref, int for_cow)
+ struct extent_buffer *buf, int full_backref)
{
- return __btrfs_mod_ref(trans, root, buf, full_backref, 0, for_cow);
+ return __btrfs_mod_ref(trans, root, buf, full_backref, 0);
}
static int write_one_cache_group(struct btrfs_trans_handle *trans,
@@ -3219,7 +3262,8 @@ again:
spin_lock(&block_group->lock);
if (block_group->cached != BTRFS_CACHE_FINISHED ||
- !btrfs_test_opt(root, SPACE_CACHE)) {
+ !btrfs_test_opt(root, SPACE_CACHE) ||
+ block_group->delalloc_bytes) {
/*
* don't bother trying to write stuff out _if_
* a) we're not cached,
@@ -3402,6 +3446,23 @@ int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr)
return readonly;
}
+static const char *alloc_name(u64 flags)
+{
+ switch (flags) {
+ case BTRFS_BLOCK_GROUP_METADATA|BTRFS_BLOCK_GROUP_DATA:
+ return "mixed";
+ case BTRFS_BLOCK_GROUP_METADATA:
+ return "metadata";
+ case BTRFS_BLOCK_GROUP_DATA:
+ return "data";
+ case BTRFS_BLOCK_GROUP_SYSTEM:
+ return "system";
+ default:
+ WARN_ON(1);
+ return "invalid-combination";
+ };
+}
+
static int update_space_info(struct btrfs_fs_info *info, u64 flags,
u64 total_bytes, u64 bytes_used,
struct btrfs_space_info **space_info)
@@ -3433,7 +3494,7 @@ static int update_space_info(struct btrfs_fs_info *info, u64 flags,
if (!found)
return -ENOMEM;
- ret = percpu_counter_init(&found->total_bytes_pinned, 0);
+ ret = percpu_counter_init(&found->total_bytes_pinned, 0, GFP_KERNEL);
if (ret) {
kfree(found);
return ret;
@@ -3457,11 +3518,21 @@ static int update_space_info(struct btrfs_fs_info *info, u64 flags,
found->chunk_alloc = 0;
found->flush = 0;
init_waitqueue_head(&found->wait);
+
+ ret = kobject_init_and_add(&found->kobj, &space_info_ktype,
+ info->space_info_kobj, "%s",
+ alloc_name(found->flags));
+ if (ret) {
+ kfree(found);
+ return ret;
+ }
+
*space_info = found;
list_add_rcu(&found->list, &info->space_info);
if (flags & BTRFS_BLOCK_GROUP_DATA)
info->data_sinfo = found;
- return 0;
+
+ return ret;
}
static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags)
@@ -3516,13 +3587,7 @@ static u64 get_restripe_target(struct btrfs_fs_info *fs_info, u64 flags)
*/
static u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags)
{
- /*
- * we add in the count of missing devices because we want
- * to make sure that any RAID levels on a degraded FS
- * continue to be honored.
- */
- u64 num_devices = root->fs_info->fs_devices->rw_devices +
- root->fs_info->fs_devices->missing_devices;
+ u64 num_devices = root->fs_info->fs_devices->rw_devices;
u64 target;
u64 tmp;
@@ -3569,11 +3634,13 @@ static u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags)
return extended_to_chunk(flags | tmp);
}
-static u64 get_alloc_profile(struct btrfs_root *root, u64 flags)
+static u64 get_alloc_profile(struct btrfs_root *root, u64 orig_flags)
{
unsigned seq;
+ u64 flags;
do {
+ flags = orig_flags;
seq = read_seqbegin(&root->fs_info->profiles_lock);
if (flags & BTRFS_BLOCK_GROUP_DATA)
@@ -3999,7 +4066,7 @@ static int can_overcommit(struct btrfs_root *root,
}
static void btrfs_writeback_inodes_sb_nr(struct btrfs_root *root,
- unsigned long nr_pages)
+ unsigned long nr_pages, int nr_items)
{
struct super_block *sb = root->fs_info->sb;
@@ -4014,9 +4081,9 @@ static void btrfs_writeback_inodes_sb_nr(struct btrfs_root *root,
* the filesystem is readonly(all dirty pages are written to
* the disk).
*/
- btrfs_start_delalloc_roots(root->fs_info, 0);
+ btrfs_start_delalloc_roots(root->fs_info, 0, nr_items);
if (!current->journal_info)
- btrfs_wait_ordered_roots(root->fs_info, -1);
+ btrfs_wait_ordered_roots(root->fs_info, nr_items);
}
}
@@ -4073,7 +4140,7 @@ static void shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, u64 orig,
while (delalloc_bytes && loops < 3) {
max_reclaim = min(delalloc_bytes, to_reclaim);
nr_pages = max_reclaim >> PAGE_CACHE_SHIFT;
- btrfs_writeback_inodes_sb_nr(root, nr_pages);
+ btrfs_writeback_inodes_sb_nr(root, nr_pages, items);
/*
* We need to wait for the async pages to actually start before
* we do anything.
@@ -4140,13 +4207,9 @@ static int may_commit_transaction(struct btrfs_root *root,
goto commit;
/* See if there is enough pinned space to make this reservation */
- spin_lock(&space_info->lock);
if (percpu_counter_compare(&space_info->total_bytes_pinned,
- bytes) >= 0) {
- spin_unlock(&space_info->lock);
+ bytes) >= 0)
goto commit;
- }
- spin_unlock(&space_info->lock);
/*
* See if there is some space in the delayed insertion reservation for
@@ -4155,16 +4218,13 @@ static int may_commit_transaction(struct btrfs_root *root,
if (space_info != delayed_rsv->space_info)
return -ENOSPC;
- spin_lock(&space_info->lock);
spin_lock(&delayed_rsv->lock);
if (percpu_counter_compare(&space_info->total_bytes_pinned,
bytes - delayed_rsv->size) >= 0) {
spin_unlock(&delayed_rsv->lock);
- spin_unlock(&space_info->lock);
return -ENOSPC;
}
spin_unlock(&delayed_rsv->lock);
- spin_unlock(&space_info->lock);
commit:
trans = btrfs_join_transaction(root);
@@ -4209,7 +4269,7 @@ static int flush_space(struct btrfs_root *root,
break;
case FLUSH_DELALLOC:
case FLUSH_DELALLOC_WAIT:
- shrink_delalloc(root, num_bytes, orig_bytes,
+ shrink_delalloc(root, num_bytes * 2, orig_bytes,
state == FLUSH_DELALLOC_WAIT);
break;
case ALLOC_CHUNK:
@@ -4235,6 +4295,104 @@ static int flush_space(struct btrfs_root *root,
return ret;
}
+
+static inline u64
+btrfs_calc_reclaim_metadata_size(struct btrfs_root *root,
+ struct btrfs_space_info *space_info)
+{
+ u64 used;
+ u64 expected;
+ u64 to_reclaim;
+
+ to_reclaim = min_t(u64, num_online_cpus() * 1024 * 1024,
+ 16 * 1024 * 1024);
+ spin_lock(&space_info->lock);
+ if (can_overcommit(root, space_info, to_reclaim,
+ BTRFS_RESERVE_FLUSH_ALL)) {
+ to_reclaim = 0;
+ goto out;
+ }
+
+ used = space_info->bytes_used + space_info->bytes_reserved +
+ space_info->bytes_pinned + space_info->bytes_readonly +
+ space_info->bytes_may_use;
+ if (can_overcommit(root, space_info, 1024 * 1024,
+ BTRFS_RESERVE_FLUSH_ALL))
+ expected = div_factor_fine(space_info->total_bytes, 95);
+ else
+ expected = div_factor_fine(space_info->total_bytes, 90);
+
+ if (used > expected)
+ to_reclaim = used - expected;
+ else
+ to_reclaim = 0;
+ to_reclaim = min(to_reclaim, space_info->bytes_may_use +
+ space_info->bytes_reserved);
+out:
+ spin_unlock(&space_info->lock);
+
+ return to_reclaim;
+}
+
+static inline int need_do_async_reclaim(struct btrfs_space_info *space_info,
+ struct btrfs_fs_info *fs_info, u64 used)
+{
+ return (used >= div_factor_fine(space_info->total_bytes, 98) &&
+ !btrfs_fs_closing(fs_info) &&
+ !test_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state));
+}
+
+static int btrfs_need_do_async_reclaim(struct btrfs_space_info *space_info,
+ struct btrfs_fs_info *fs_info)
+{
+ u64 used;
+
+ spin_lock(&space_info->lock);
+ used = space_info->bytes_used + space_info->bytes_reserved +
+ space_info->bytes_pinned + space_info->bytes_readonly +
+ space_info->bytes_may_use;
+ if (need_do_async_reclaim(space_info, fs_info, used)) {
+ spin_unlock(&space_info->lock);
+ return 1;
+ }
+ spin_unlock(&space_info->lock);
+
+ return 0;
+}
+
+static void btrfs_async_reclaim_metadata_space(struct work_struct *work)
+{
+ struct btrfs_fs_info *fs_info;
+ struct btrfs_space_info *space_info;
+ u64 to_reclaim;
+ int flush_state;
+
+ fs_info = container_of(work, struct btrfs_fs_info, async_reclaim_work);
+ space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA);
+
+ to_reclaim = btrfs_calc_reclaim_metadata_size(fs_info->fs_root,
+ space_info);
+ if (!to_reclaim)
+ return;
+
+ flush_state = FLUSH_DELAYED_ITEMS_NR;
+ do {
+ flush_space(fs_info->fs_root, space_info, to_reclaim,
+ to_reclaim, flush_state);
+ flush_state++;
+ if (!btrfs_need_do_async_reclaim(space_info, fs_info))
+ return;
+ } while (flush_state <= COMMIT_TRANS);
+
+ if (btrfs_need_do_async_reclaim(space_info, fs_info))
+ queue_work(system_unbound_wq, work);
+}
+
+void btrfs_init_async_reclaim_work(struct work_struct *work)
+{
+ INIT_WORK(work, btrfs_async_reclaim_metadata_space);
+}
+
/**
* reserve_metadata_bytes - try to reserve bytes from the block_rsv's space
* @root - the root we're allocating for
@@ -4342,8 +4500,13 @@ again:
if (ret && flush != BTRFS_RESERVE_NO_FLUSH) {
flushing = true;
space_info->flush = 1;
+ } else if (!ret && space_info->flags & BTRFS_BLOCK_GROUP_METADATA) {
+ used += orig_bytes;
+ if (need_do_async_reclaim(space_info, root->fs_info, used) &&
+ !work_busy(&root->fs_info->async_reclaim_work))
+ queue_work(system_unbound_wq,
+ &root->fs_info->async_reclaim_work);
}
-
spin_unlock(&space_info->lock);
if (!ret || flush == BTRFS_RESERVE_NO_FLUSH)
@@ -4400,7 +4563,7 @@ static struct btrfs_block_rsv *get_block_rsv(
{
struct btrfs_block_rsv *block_rsv = NULL;
- if (root->ref_cows)
+ if (test_bit(BTRFS_ROOT_REF_COWS, &root->state))
block_rsv = trans->block_rsv;
if (root == root->fs_info->csum_root && trans->adding_csums)
@@ -4637,7 +4800,7 @@ void btrfs_block_rsv_release(struct btrfs_root *root,
u64 num_bytes)
{
struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv;
- if (global_rsv->full || global_rsv == block_rsv ||
+ if (global_rsv == block_rsv ||
block_rsv->space_info != global_rsv->space_info)
global_rsv = NULL;
block_rsv_release_bytes(root->fs_info, block_rsv, global_rsv,
@@ -5447,6 +5610,7 @@ int btrfs_exclude_logged_extents(struct btrfs_root *log,
* @cache: The cache we are manipulating
* @num_bytes: The number of bytes in question
* @reserve: One of the reservation enums
+ * @delalloc: The blocks are allocated for the delalloc write
*
* This is called by the allocator when it reserves space, or by somebody who is
* freeing space that was never actually used on disk. For example if you
@@ -5465,7 +5629,7 @@ int btrfs_exclude_logged_extents(struct btrfs_root *log,
* succeeds.
*/
static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache,
- u64 num_bytes, int reserve)
+ u64 num_bytes, int reserve, int delalloc)
{
struct btrfs_space_info *space_info = cache->space_info;
int ret = 0;
@@ -5484,12 +5648,18 @@ static int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache,
num_bytes, 0);
space_info->bytes_may_use -= num_bytes;
}
+
+ if (delalloc)
+ cache->delalloc_bytes += num_bytes;
}
} else {
if (cache->ro)
space_info->bytes_readonly += num_bytes;
cache->reserved -= num_bytes;
space_info->bytes_reserved -= num_bytes;
+
+ if (delalloc)
+ cache->delalloc_bytes -= num_bytes;
}
spin_unlock(&cache->lock);
spin_unlock(&space_info->lock);
@@ -5503,9 +5673,8 @@ void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
struct btrfs_caching_control *next;
struct btrfs_caching_control *caching_ctl;
struct btrfs_block_group_cache *cache;
- struct btrfs_space_info *space_info;
- down_write(&fs_info->extent_commit_sem);
+ down_write(&fs_info->commit_root_sem);
list_for_each_entry_safe(caching_ctl, next,
&fs_info->caching_block_groups, list) {
@@ -5524,10 +5693,7 @@ void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
else
fs_info->pinned_extents = &fs_info->freed_extents[0];
- up_write(&fs_info->extent_commit_sem);
-
- list_for_each_entry_rcu(space_info, &fs_info->space_info, list)
- percpu_counter_set(&space_info->total_bytes_pinned, 0);
+ up_write(&fs_info->commit_root_sem);
update_global_block_rsv(fs_info);
}
@@ -5566,6 +5732,7 @@ static int unpin_extent_range(struct btrfs_root *root, u64 start, u64 end)
spin_lock(&cache->lock);
cache->pinned -= len;
space_info->bytes_pinned -= len;
+ percpu_counter_add(&space_info->total_bytes_pinned, -len);
if (cache->ro) {
space_info->bytes_readonly += len;
readonly = true;
@@ -5652,7 +5819,8 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
u64 bytenr, u64 num_bytes, u64 parent,
u64 root_objectid, u64 owner_objectid,
u64 owner_offset, int refs_to_drop,
- struct btrfs_delayed_extent_op *extent_op)
+ struct btrfs_delayed_extent_op *extent_op,
+ int no_quota)
{
struct btrfs_key key;
struct btrfs_path *path;
@@ -5668,9 +5836,14 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
int num_to_del = 1;
u32 item_size;
u64 refs;
+ int last_ref = 0;
+ enum btrfs_qgroup_operation_type type = BTRFS_QGROUP_OPER_SUB_EXCL;
bool skinny_metadata = btrfs_fs_incompat(root->fs_info,
SKINNY_METADATA);
+ if (!info->quota_enabled || !is_fstree(root_objectid))
+ no_quota = 1;
+
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
@@ -5718,7 +5891,7 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
BUG_ON(iref);
ret = remove_extent_backref(trans, extent_root, path,
NULL, refs_to_drop,
- is_data);
+ is_data, &last_ref);
if (ret) {
btrfs_abort_transaction(trans, extent_root, ret);
goto out;
@@ -5753,6 +5926,7 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
if (ret > 0 && skinny_metadata) {
skinny_metadata = false;
+ key.objectid = bytenr;
key.type = BTRFS_EXTENT_ITEM_KEY;
key.offset = num_bytes;
btrfs_release_path(path);
@@ -5779,6 +5953,8 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
"unable to find ref byte nr %llu parent %llu root %llu owner %llu offset %llu",
bytenr, parent, root_objectid, owner_objectid,
owner_offset);
+ btrfs_abort_transaction(trans, extent_root, ret);
+ goto out;
} else {
btrfs_abort_transaction(trans, extent_root, ret);
goto out;
@@ -5834,7 +6010,7 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
refs = btrfs_extent_refs(leaf, ei);
if (refs < refs_to_drop) {
btrfs_err(info, "trying to drop %d refs but we only have %Lu "
- "for bytenr %Lu\n", refs_to_drop, refs, bytenr);
+ "for bytenr %Lu", refs_to_drop, refs, bytenr);
ret = -EINVAL;
btrfs_abort_transaction(trans, extent_root, ret);
goto out;
@@ -5842,6 +6018,7 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
refs -= refs_to_drop;
if (refs > 0) {
+ type = BTRFS_QGROUP_OPER_SUB_SHARED;
if (extent_op)
__run_delayed_extent_op(extent_op, leaf, ei);
/*
@@ -5857,7 +6034,7 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
if (found_extent) {
ret = remove_extent_backref(trans, extent_root, path,
iref, refs_to_drop,
- is_data);
+ is_data, &last_ref);
if (ret) {
btrfs_abort_transaction(trans, extent_root, ret);
goto out;
@@ -5878,6 +6055,7 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
}
}
+ last_ref = 1;
ret = btrfs_del_items(trans, extent_root, path, path->slots[0],
num_to_del);
if (ret) {
@@ -5900,6 +6078,20 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
goto out;
}
}
+ btrfs_release_path(path);
+
+ /* Deal with the quota accounting */
+ if (!ret && last_ref && !no_quota) {
+ int mod_seq = 0;
+
+ if (owner_objectid >= BTRFS_FIRST_FREE_OBJECTID &&
+ type == BTRFS_QGROUP_OPER_SUB_SHARED)
+ mod_seq = 1;
+
+ ret = btrfs_qgroup_record_ref(trans, info, root_objectid,
+ bytenr, num_bytes, type,
+ mod_seq);
+ }
out:
btrfs_free_path(path);
return ret;
@@ -5916,24 +6108,16 @@ static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans,
{
struct btrfs_delayed_ref_head *head;
struct btrfs_delayed_ref_root *delayed_refs;
- struct btrfs_delayed_ref_node *ref;
- struct rb_node *node;
int ret = 0;
delayed_refs = &trans->transaction->delayed_refs;
spin_lock(&delayed_refs->lock);
head = btrfs_find_delayed_ref_head(trans, bytenr);
if (!head)
- goto out;
+ goto out_delayed_unlock;
- node = rb_prev(&head->node.rb_node);
- if (!node)
- goto out;
-
- ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node);
-
- /* there are still entries for this ref, we can't drop it */
- if (ref->bytenr == bytenr)
+ spin_lock(&head->lock);
+ if (rb_first(&head->ref_root))
goto out;
if (head->extent_op) {
@@ -5955,19 +6139,19 @@ static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans,
* ahead and process it.
*/
head->node.in_tree = 0;
- rb_erase(&head->node.rb_node, &delayed_refs->root);
+ rb_erase(&head->href_node, &delayed_refs->href_root);
- delayed_refs->num_entries--;
+ atomic_dec(&delayed_refs->num_entries);
/*
* we don't take a ref on the node because we're removing it from the
* tree, so we just steal the ref the tree was holding.
*/
delayed_refs->num_heads--;
- if (list_empty(&head->cluster))
+ if (head->processing == 0)
delayed_refs->num_heads_ready--;
-
- list_del_init(&head->cluster);
+ head->processing = 0;
+ spin_unlock(&head->lock);
spin_unlock(&delayed_refs->lock);
BUG_ON(head->extent_op);
@@ -5978,6 +6162,9 @@ static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans,
btrfs_put_delayed_ref(&head->node);
return ret;
out:
+ spin_unlock(&head->lock);
+
+out_delayed_unlock:
spin_unlock(&delayed_refs->lock);
return 0;
}
@@ -6020,7 +6207,7 @@ void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags));
btrfs_add_free_space(cache, buf->start, buf->len);
- btrfs_update_reserved_bytes(cache, buf->len, RESERVE_FREE);
+ btrfs_update_reserved_bytes(cache, buf->len, RESERVE_FREE, 0);
trace_btrfs_reserved_extent_free(root, buf->start, buf->len);
pin = 0;
}
@@ -6041,11 +6228,15 @@ out:
/* Can return -ENOMEM */
int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root,
u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
- u64 owner, u64 offset, int for_cow)
+ u64 owner, u64 offset, int no_quota)
{
int ret;
struct btrfs_fs_info *fs_info = root->fs_info;
+#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
+ if (unlikely(test_bit(BTRFS_ROOT_DUMMY_ROOT, &root->state)))
+ return 0;
+#endif
add_pinned_bytes(root->fs_info, num_bytes, owner, root_objectid);
/*
@@ -6061,13 +6252,13 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root,
ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr,
num_bytes,
parent, root_objectid, (int)owner,
- BTRFS_DROP_DELAYED_REF, NULL, for_cow);
+ BTRFS_DROP_DELAYED_REF, NULL, no_quota);
} else {
ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr,
num_bytes,
parent, root_objectid, owner,
offset, BTRFS_DROP_DELAYED_REF,
- NULL, for_cow);
+ NULL, no_quota);
}
return ret;
}
@@ -6145,11 +6336,29 @@ int __get_raid_index(u64 flags)
return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */
}
-static int get_block_group_index(struct btrfs_block_group_cache *cache)
+int get_block_group_index(struct btrfs_block_group_cache *cache)
{
return __get_raid_index(cache->flags);
}
+static const char *btrfs_raid_type_names[BTRFS_NR_RAID_TYPES] = {
+ [BTRFS_RAID_RAID10] = "raid10",
+ [BTRFS_RAID_RAID1] = "raid1",
+ [BTRFS_RAID_DUP] = "dup",
+ [BTRFS_RAID_RAID0] = "raid0",
+ [BTRFS_RAID_SINGLE] = "single",
+ [BTRFS_RAID_RAID5] = "raid5",
+ [BTRFS_RAID_RAID6] = "raid6",
+};
+
+static const char *get_raid_name(enum btrfs_raid_types type)
+{
+ if (type >= BTRFS_NR_RAID_TYPES)
+ return NULL;
+
+ return btrfs_raid_type_names[type];
+}
+
enum btrfs_loop_type {
LOOP_CACHING_NOWAIT = 0,
LOOP_CACHING_WAIT = 1,
@@ -6157,6 +6366,70 @@ enum btrfs_loop_type {
LOOP_NO_EMPTY_SIZE = 3,
};
+static inline void
+btrfs_lock_block_group(struct btrfs_block_group_cache *cache,
+ int delalloc)
+{
+ if (delalloc)
+ down_read(&cache->data_rwsem);
+}
+
+static inline void
+btrfs_grab_block_group(struct btrfs_block_group_cache *cache,
+ int delalloc)
+{
+ btrfs_get_block_group(cache);
+ if (delalloc)
+ down_read(&cache->data_rwsem);
+}
+
+static struct btrfs_block_group_cache *
+btrfs_lock_cluster(struct btrfs_block_group_cache *block_group,
+ struct btrfs_free_cluster *cluster,
+ int delalloc)
+{
+ struct btrfs_block_group_cache *used_bg;
+ bool locked = false;
+again:
+ spin_lock(&cluster->refill_lock);
+ if (locked) {
+ if (used_bg == cluster->block_group)
+ return used_bg;
+
+ up_read(&used_bg->data_rwsem);
+ btrfs_put_block_group(used_bg);
+ }
+
+ used_bg = cluster->block_group;
+ if (!used_bg)
+ return NULL;
+
+ if (used_bg == block_group)
+ return used_bg;
+
+ btrfs_get_block_group(used_bg);
+
+ if (!delalloc)
+ return used_bg;
+
+ if (down_read_trylock(&used_bg->data_rwsem))
+ return used_bg;
+
+ spin_unlock(&cluster->refill_lock);
+ down_read(&used_bg->data_rwsem);
+ locked = true;
+ goto again;
+}
+
+static inline void
+btrfs_release_block_group(struct btrfs_block_group_cache *cache,
+ int delalloc)
+{
+ if (delalloc)
+ up_read(&cache->data_rwsem);
+ btrfs_put_block_group(cache);
+}
+
/*
* walks the btree of allocated extents and find a hole of a given size.
* The key ins is changed to record the hole:
@@ -6171,13 +6444,12 @@ enum btrfs_loop_type {
static noinline int find_free_extent(struct btrfs_root *orig_root,
u64 num_bytes, u64 empty_size,
u64 hint_byte, struct btrfs_key *ins,
- u64 flags)
+ u64 flags, int delalloc)
{
int ret = 0;
struct btrfs_root *root = orig_root->fs_info->extent_root;
struct btrfs_free_cluster *last_ptr = NULL;
struct btrfs_block_group_cache *block_group = NULL;
- struct btrfs_block_group_cache *used_block_group;
u64 search_start = 0;
u64 max_extent_size = 0;
int empty_cluster = 2 * 1024 * 1024;
@@ -6186,7 +6458,6 @@ static noinline int find_free_extent(struct btrfs_root *orig_root,
int index = __get_raid_index(flags);
int alloc_type = (flags & BTRFS_BLOCK_GROUP_DATA) ?
RESERVE_ALLOC_NO_ACCOUNT : RESERVE_ALLOC;
- bool found_uncached_bg = false;
bool failed_cluster_refill = false;
bool failed_alloc = false;
bool use_cluster = true;
@@ -6239,7 +6510,6 @@ static noinline int find_free_extent(struct btrfs_root *orig_root,
if (search_start == hint_byte) {
block_group = btrfs_lookup_block_group(root->fs_info,
search_start);
- used_block_group = block_group;
/*
* we don't want to use the block group if it doesn't match our
* allocation bits, or if its not cached.
@@ -6262,6 +6532,7 @@ static noinline int find_free_extent(struct btrfs_root *orig_root,
up_read(&space_info->groups_sem);
} else {
index = get_block_group_index(block_group);
+ btrfs_lock_block_group(block_group, delalloc);
goto have_block_group;
}
} else if (block_group) {
@@ -6276,8 +6547,7 @@ search:
u64 offset;
int cached;
- used_block_group = block_group;
- btrfs_get_block_group(block_group);
+ btrfs_grab_block_group(block_group, delalloc);
search_start = block_group->key.objectid;
/*
@@ -6304,7 +6574,6 @@ search:
have_block_group:
cached = block_group_cache_done(block_group);
if (unlikely(!cached)) {
- found_uncached_bg = true;
ret = cache_block_group(block_group, 0);
BUG_ON(ret < 0);
ret = 0;
@@ -6320,23 +6589,22 @@ have_block_group:
* lets look there
*/
if (last_ptr) {
+ struct btrfs_block_group_cache *used_block_group;
unsigned long aligned_cluster;
/*
* the refill lock keeps out other
* people trying to start a new cluster
*/
- spin_lock(&last_ptr->refill_lock);
- used_block_group = last_ptr->block_group;
- if (used_block_group != block_group &&
- (!used_block_group ||
- used_block_group->ro ||
- !block_group_bits(used_block_group, flags))) {
- used_block_group = block_group;
+ used_block_group = btrfs_lock_cluster(block_group,
+ last_ptr,
+ delalloc);
+ if (!used_block_group)
goto refill_cluster;
- }
- if (used_block_group != block_group)
- btrfs_get_block_group(used_block_group);
+ if (used_block_group != block_group &&
+ (used_block_group->ro ||
+ !block_group_bits(used_block_group, flags)))
+ goto release_cluster;
offset = btrfs_alloc_from_cluster(used_block_group,
last_ptr,
@@ -6347,17 +6615,18 @@ have_block_group:
/* we have a block, we're done */
spin_unlock(&last_ptr->refill_lock);
trace_btrfs_reserve_extent_cluster(root,
- block_group, search_start, num_bytes);
+ used_block_group,
+ search_start, num_bytes);
+ if (used_block_group != block_group) {
+ btrfs_release_block_group(block_group,
+ delalloc);
+ block_group = used_block_group;
+ }
goto checks;
}
WARN_ON(last_ptr->block_group != used_block_group);
- if (used_block_group != block_group) {
- btrfs_put_block_group(used_block_group);
- used_block_group = block_group;
- }
-refill_cluster:
- BUG_ON(used_block_group != block_group);
+release_cluster:
/* If we are on LOOP_NO_EMPTY_SIZE, we can't
* set up a new clusters, so lets just skip it
* and let the allocator find whatever block
@@ -6374,8 +6643,10 @@ refill_cluster:
* succeeding in the unclustered
* allocation. */
if (loop >= LOOP_NO_EMPTY_SIZE &&
- last_ptr->block_group != block_group) {
+ used_block_group != block_group) {
spin_unlock(&last_ptr->refill_lock);
+ btrfs_release_block_group(used_block_group,
+ delalloc);
goto unclustered_alloc;
}
@@ -6385,6 +6656,10 @@ refill_cluster:
*/
btrfs_return_cluster_to_free_space(NULL, last_ptr);
+ if (used_block_group != block_group)
+ btrfs_release_block_group(used_block_group,
+ delalloc);
+refill_cluster:
if (loop >= LOOP_NO_EMPTY_SIZE) {
spin_unlock(&last_ptr->refill_lock);
goto unclustered_alloc;
@@ -6476,25 +6751,25 @@ unclustered_alloc:
goto loop;
}
checks:
- search_start = stripe_align(root, used_block_group,
+ search_start = stripe_align(root, block_group,
offset, num_bytes);
/* move on to the next group */
if (search_start + num_bytes >
- used_block_group->key.objectid + used_block_group->key.offset) {
- btrfs_add_free_space(used_block_group, offset, num_bytes);
+ block_group->key.objectid + block_group->key.offset) {
+ btrfs_add_free_space(block_group, offset, num_bytes);
goto loop;
}
if (offset < search_start)
- btrfs_add_free_space(used_block_group, offset,
+ btrfs_add_free_space(block_group, offset,
search_start - offset);
BUG_ON(offset > search_start);
- ret = btrfs_update_reserved_bytes(used_block_group, num_bytes,
- alloc_type);
+ ret = btrfs_update_reserved_bytes(block_group, num_bytes,
+ alloc_type, delalloc);
if (ret == -EAGAIN) {
- btrfs_add_free_space(used_block_group, offset, num_bytes);
+ btrfs_add_free_space(block_group, offset, num_bytes);
goto loop;
}
@@ -6504,17 +6779,13 @@ checks:
trace_btrfs_reserve_extent(orig_root, block_group,
search_start, num_bytes);
- if (used_block_group != block_group)
- btrfs_put_block_group(used_block_group);
- btrfs_put_block_group(block_group);
+ btrfs_release_block_group(block_group, delalloc);
break;
loop:
failed_cluster_refill = false;
failed_alloc = false;
BUG_ON(index != get_block_group_index(block_group));
- if (used_block_group != block_group)
- btrfs_put_block_group(used_block_group);
- btrfs_put_block_group(block_group);
+ btrfs_release_block_group(block_group, delalloc);
}
up_read(&space_info->groups_sem);
@@ -6537,8 +6808,14 @@ loop:
loop++;
if (loop == LOOP_ALLOC_CHUNK) {
struct btrfs_trans_handle *trans;
+ int exist = 0;
+
+ trans = current->journal_info;
+ if (trans)
+ exist = 1;
+ else
+ trans = btrfs_join_transaction(root);
- trans = btrfs_join_transaction(root);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
goto out;
@@ -6555,7 +6832,8 @@ loop:
root, ret);
else
ret = 0;
- btrfs_end_transaction(trans, root);
+ if (!exist)
+ btrfs_end_transaction(trans, root);
if (ret)
goto out;
}
@@ -6584,12 +6862,12 @@ static void dump_space_info(struct btrfs_space_info *info, u64 bytes,
int index = 0;
spin_lock(&info->lock);
- printk(KERN_INFO "space_info %llu has %llu free, is %sfull\n",
+ printk(KERN_INFO "BTRFS: space_info %llu has %llu free, is %sfull\n",
info->flags,
info->total_bytes - info->bytes_used - info->bytes_pinned -
info->bytes_reserved - info->bytes_readonly,
(info->full) ? "" : "not ");
- printk(KERN_INFO "space_info total=%llu, used=%llu, pinned=%llu, "
+ printk(KERN_INFO "BTRFS: space_info total=%llu, used=%llu, pinned=%llu, "
"reserved=%llu, may_use=%llu, readonly=%llu\n",
info->total_bytes, info->bytes_used, info->bytes_pinned,
info->bytes_reserved, info->bytes_may_use,
@@ -6603,7 +6881,9 @@ static void dump_space_info(struct btrfs_space_info *info, u64 bytes,
again:
list_for_each_entry(cache, &info->block_groups[index], list) {
spin_lock(&cache->lock);
- printk(KERN_INFO "block group %llu has %llu bytes, %llu used %llu pinned %llu reserved %s\n",
+ printk(KERN_INFO "BTRFS: "
+ "block group %llu has %llu bytes, "
+ "%llu used %llu pinned %llu reserved %s\n",
cache->key.objectid, cache->key.offset,
btrfs_block_group_used(&cache->item), cache->pinned,
cache->reserved, cache->ro ? "[readonly]" : "");
@@ -6618,7 +6898,7 @@ again:
int btrfs_reserve_extent(struct btrfs_root *root,
u64 num_bytes, u64 min_alloc_size,
u64 empty_size, u64 hint_byte,
- struct btrfs_key *ins, int is_data)
+ struct btrfs_key *ins, int is_data, int delalloc)
{
bool final_tried = false;
u64 flags;
@@ -6628,7 +6908,7 @@ int btrfs_reserve_extent(struct btrfs_root *root,
again:
WARN_ON(num_bytes < root->sectorsize);
ret = find_free_extent(root, num_bytes, empty_size, hint_byte, ins,
- flags);
+ flags, delalloc);
if (ret == -ENOSPC) {
if (!final_tried && ins->offset) {
@@ -6653,7 +6933,8 @@ again:
}
static int __btrfs_free_reserved_extent(struct btrfs_root *root,
- u64 start, u64 len, int pin)
+ u64 start, u64 len,
+ int pin, int delalloc)
{
struct btrfs_block_group_cache *cache;
int ret = 0;
@@ -6672,7 +6953,7 @@ static int __btrfs_free_reserved_extent(struct btrfs_root *root,
pin_down_extent(root, cache, start, len, 1);
else {
btrfs_add_free_space(cache, start, len);
- btrfs_update_reserved_bytes(cache, len, RESERVE_FREE);
+ btrfs_update_reserved_bytes(cache, len, RESERVE_FREE, delalloc);
}
btrfs_put_block_group(cache);
@@ -6682,15 +6963,15 @@ static int __btrfs_free_reserved_extent(struct btrfs_root *root,
}
int btrfs_free_reserved_extent(struct btrfs_root *root,
- u64 start, u64 len)
+ u64 start, u64 len, int delalloc)
{
- return __btrfs_free_reserved_extent(root, start, len, 0);
+ return __btrfs_free_reserved_extent(root, start, len, 0, delalloc);
}
int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root,
u64 start, u64 len)
{
- return __btrfs_free_reserved_extent(root, start, len, 1);
+ return __btrfs_free_reserved_extent(root, start, len, 1, 0);
}
static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
@@ -6754,6 +7035,13 @@ static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
btrfs_mark_buffer_dirty(path->nodes[0]);
btrfs_free_path(path);
+ /* Always set parent to 0 here since its exclusive anyway. */
+ ret = btrfs_qgroup_record_ref(trans, fs_info, root_objectid,
+ ins->objectid, ins->offset,
+ BTRFS_QGROUP_OPER_ADD_EXCL, 0);
+ if (ret)
+ return ret;
+
ret = update_block_group(root, ins->objectid, ins->offset, 1);
if (ret) { /* -ENOENT, logic error */
btrfs_err(fs_info, "update block group failed for %llu %llu",
@@ -6768,7 +7056,8 @@ static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 parent, u64 root_objectid,
u64 flags, struct btrfs_disk_key *key,
- int level, struct btrfs_key *ins)
+ int level, struct btrfs_key *ins,
+ int no_quota)
{
int ret;
struct btrfs_fs_info *fs_info = root->fs_info;
@@ -6778,6 +7067,7 @@ static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans,
struct btrfs_path *path;
struct extent_buffer *leaf;
u32 size = sizeof(*extent_item) + sizeof(*iref);
+ u64 num_bytes = ins->offset;
bool skinny_metadata = btrfs_fs_incompat(root->fs_info,
SKINNY_METADATA);
@@ -6811,6 +7101,7 @@ static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans,
if (skinny_metadata) {
iref = (struct btrfs_extent_inline_ref *)(extent_item + 1);
+ num_bytes = root->leafsize;
} else {
block_info = (struct btrfs_tree_block_info *)(extent_item + 1);
btrfs_set_tree_block_key(leaf, block_info, key);
@@ -6832,6 +7123,14 @@ static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans,
btrfs_mark_buffer_dirty(leaf);
btrfs_free_path(path);
+ if (!no_quota) {
+ ret = btrfs_qgroup_record_ref(trans, fs_info, root_objectid,
+ ins->objectid, num_bytes,
+ BTRFS_QGROUP_OPER_ADD_EXCL, 0);
+ if (ret)
+ return ret;
+ }
+
ret = update_block_group(root, ins->objectid, root->leafsize, 1);
if (ret) { /* -ENOENT, logic error */
btrfs_err(fs_info, "update block group failed for %llu %llu",
@@ -6887,7 +7186,7 @@ int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
return -EINVAL;
ret = btrfs_update_reserved_bytes(block_group, ins->offset,
- RESERVE_ALLOC_NO_ACCOUNT);
+ RESERVE_ALLOC_NO_ACCOUNT, 0);
BUG_ON(ret); /* logic error */
ret = alloc_reserved_file_extent(trans, root, 0, root_objectid,
0, owner, offset, ins, 1);
@@ -6966,7 +7265,7 @@ again:
/*DEFAULT_RATELIMIT_BURST*/ 1);
if (__ratelimit(&_rs))
WARN(1, KERN_DEBUG
- "btrfs: block rsv returned %d\n", ret);
+ "BTRFS: block rsv returned %d\n", ret);
}
try_reserve:
ret = reserve_metadata_bytes(root, block_rsv, blocksize,
@@ -7015,12 +7314,21 @@ struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
bool skinny_metadata = btrfs_fs_incompat(root->fs_info,
SKINNY_METADATA);
+#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
+ if (unlikely(test_bit(BTRFS_ROOT_DUMMY_ROOT, &root->state))) {
+ buf = btrfs_init_new_buffer(trans, root, root->alloc_bytenr,
+ blocksize, level);
+ if (!IS_ERR(buf))
+ root->alloc_bytenr += blocksize;
+ return buf;
+ }
+#endif
block_rsv = use_block_rsv(trans, root, blocksize);
if (IS_ERR(block_rsv))
return ERR_CAST(block_rsv);
ret = btrfs_reserve_extent(root, blocksize, blocksize,
- empty_size, hint, &ins, 0);
+ empty_size, hint, &ins, 0, 0);
if (ret) {
unuse_block_rsv(root->fs_info, block_rsv, blocksize);
return ERR_PTR(ret);
@@ -7165,6 +7473,220 @@ reada:
wc->reada_slot = slot;
}
+static int account_leaf_items(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_buffer *eb)
+{
+ int nr = btrfs_header_nritems(eb);
+ int i, extent_type, ret;
+ struct btrfs_key key;
+ struct btrfs_file_extent_item *fi;
+ u64 bytenr, num_bytes;
+
+ for (i = 0; i < nr; i++) {
+ btrfs_item_key_to_cpu(eb, &key, i);
+
+ if (key.type != BTRFS_EXTENT_DATA_KEY)
+ continue;
+
+ fi = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item);
+ /* filter out non qgroup-accountable extents */
+ extent_type = btrfs_file_extent_type(eb, fi);
+
+ if (extent_type == BTRFS_FILE_EXTENT_INLINE)
+ continue;
+
+ bytenr = btrfs_file_extent_disk_bytenr(eb, fi);
+ if (!bytenr)
+ continue;
+
+ num_bytes = btrfs_file_extent_disk_num_bytes(eb, fi);
+
+ ret = btrfs_qgroup_record_ref(trans, root->fs_info,
+ root->objectid,
+ bytenr, num_bytes,
+ BTRFS_QGROUP_OPER_SUB_SUBTREE, 0);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+/*
+ * Walk up the tree from the bottom, freeing leaves and any interior
+ * nodes which have had all slots visited. If a node (leaf or
+ * interior) is freed, the node above it will have it's slot
+ * incremented. The root node will never be freed.
+ *
+ * At the end of this function, we should have a path which has all
+ * slots incremented to the next position for a search. If we need to
+ * read a new node it will be NULL and the node above it will have the
+ * correct slot selected for a later read.
+ *
+ * If we increment the root nodes slot counter past the number of
+ * elements, 1 is returned to signal completion of the search.
+ */
+static int adjust_slots_upwards(struct btrfs_root *root,
+ struct btrfs_path *path, int root_level)
+{
+ int level = 0;
+ int nr, slot;
+ struct extent_buffer *eb;
+
+ if (root_level == 0)
+ return 1;
+
+ while (level <= root_level) {
+ eb = path->nodes[level];
+ nr = btrfs_header_nritems(eb);
+ path->slots[level]++;
+ slot = path->slots[level];
+ if (slot >= nr || level == 0) {
+ /*
+ * Don't free the root - we will detect this
+ * condition after our loop and return a
+ * positive value for caller to stop walking the tree.
+ */
+ if (level != root_level) {
+ btrfs_tree_unlock_rw(eb, path->locks[level]);
+ path->locks[level] = 0;
+
+ free_extent_buffer(eb);
+ path->nodes[level] = NULL;
+ path->slots[level] = 0;
+ }
+ } else {
+ /*
+ * We have a valid slot to walk back down
+ * from. Stop here so caller can process these
+ * new nodes.
+ */
+ break;
+ }
+
+ level++;
+ }
+
+ eb = path->nodes[root_level];
+ if (path->slots[root_level] >= btrfs_header_nritems(eb))
+ return 1;
+
+ return 0;
+}
+
+/*
+ * root_eb is the subtree root and is locked before this function is called.
+ */
+static int account_shared_subtree(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_buffer *root_eb,
+ u64 root_gen,
+ int root_level)
+{
+ int ret = 0;
+ int level;
+ struct extent_buffer *eb = root_eb;
+ struct btrfs_path *path = NULL;
+
+ BUG_ON(root_level < 0 || root_level > BTRFS_MAX_LEVEL);
+ BUG_ON(root_eb == NULL);
+
+ if (!root->fs_info->quota_enabled)
+ return 0;
+
+ if (!extent_buffer_uptodate(root_eb)) {
+ ret = btrfs_read_buffer(root_eb, root_gen);
+ if (ret)
+ goto out;
+ }
+
+ if (root_level == 0) {
+ ret = account_leaf_items(trans, root, root_eb);
+ goto out;
+ }
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ /*
+ * Walk down the tree. Missing extent blocks are filled in as
+ * we go. Metadata is accounted every time we read a new
+ * extent block.
+ *
+ * When we reach a leaf, we account for file extent items in it,
+ * walk back up the tree (adjusting slot pointers as we go)
+ * and restart the search process.
+ */
+ extent_buffer_get(root_eb); /* For path */
+ path->nodes[root_level] = root_eb;
+ path->slots[root_level] = 0;
+ path->locks[root_level] = 0; /* so release_path doesn't try to unlock */
+walk_down:
+ level = root_level;
+ while (level >= 0) {
+ if (path->nodes[level] == NULL) {
+ int child_bsize = root->nodesize;
+ int parent_slot;
+ u64 child_gen;
+ u64 child_bytenr;
+
+ /* We need to get child blockptr/gen from
+ * parent before we can read it. */
+ eb = path->nodes[level + 1];
+ parent_slot = path->slots[level + 1];
+ child_bytenr = btrfs_node_blockptr(eb, parent_slot);
+ child_gen = btrfs_node_ptr_generation(eb, parent_slot);
+
+ eb = read_tree_block(root, child_bytenr, child_bsize,
+ child_gen);
+ if (!eb || !extent_buffer_uptodate(eb)) {
+ ret = -EIO;
+ goto out;
+ }
+
+ path->nodes[level] = eb;
+ path->slots[level] = 0;
+
+ btrfs_tree_read_lock(eb);
+ btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK);
+ path->locks[level] = BTRFS_READ_LOCK_BLOCKING;
+
+ ret = btrfs_qgroup_record_ref(trans, root->fs_info,
+ root->objectid,
+ child_bytenr,
+ child_bsize,
+ BTRFS_QGROUP_OPER_SUB_SUBTREE,
+ 0);
+ if (ret)
+ goto out;
+
+ }
+
+ if (level == 0) {
+ ret = account_leaf_items(trans, root, path->nodes[level]);
+ if (ret)
+ goto out;
+
+ /* Nonzero return here means we completed our search */
+ ret = adjust_slots_upwards(root, path, root_level);
+ if (ret)
+ break;
+
+ /* Restart search with new slots */
+ goto walk_down;
+ }
+
+ level--;
+ }
+
+ ret = 0;
+out:
+ btrfs_free_path(path);
+
+ return ret;
+}
+
/*
* helper to process tree block while walking down the tree.
*
@@ -7219,9 +7741,9 @@ static noinline int walk_down_proc(struct btrfs_trans_handle *trans,
/* wc->stage == UPDATE_BACKREF */
if (!(wc->flags[level] & flag)) {
BUG_ON(!path->locks[level]);
- ret = btrfs_inc_ref(trans, root, eb, 1, wc->for_reloc);
+ ret = btrfs_inc_ref(trans, root, eb, 1);
BUG_ON(ret); /* -ENOMEM */
- ret = btrfs_dec_ref(trans, root, eb, 0, wc->for_reloc);
+ ret = btrfs_dec_ref(trans, root, eb, 0);
BUG_ON(ret); /* -ENOMEM */
ret = btrfs_set_disk_extent_flags(trans, root, eb->start,
eb->len, flag,
@@ -7268,6 +7790,7 @@ static noinline int do_walk_down(struct btrfs_trans_handle *trans,
int level = wc->level;
int reada = 0;
int ret = 0;
+ bool need_account = false;
generation = btrfs_node_ptr_generation(path->nodes[level],
path->slots[level]);
@@ -7313,6 +7836,7 @@ static noinline int do_walk_down(struct btrfs_trans_handle *trans,
if (wc->stage == DROP_REFERENCE) {
if (wc->refs[level - 1] > 1) {
+ need_account = true;
if (level == 1 &&
(wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF))
goto skip;
@@ -7376,6 +7900,16 @@ skip:
parent = 0;
}
+ if (need_account) {
+ ret = account_shared_subtree(trans, root, next,
+ generation, level - 1);
+ if (ret) {
+ printk_ratelimited(KERN_ERR "BTRFS: %s Error "
+ "%d accounting shared subtree. Quota "
+ "is out of sync, rescan required.\n",
+ root->fs_info->sb->s_id, ret);
+ }
+ }
ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent,
root->root_key.objectid, level - 1, 0, 0);
BUG_ON(ret); /* -ENOMEM */
@@ -7456,12 +7990,17 @@ static noinline int walk_up_proc(struct btrfs_trans_handle *trans,
if (wc->refs[level] == 1) {
if (level == 0) {
if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF)
- ret = btrfs_dec_ref(trans, root, eb, 1,
- wc->for_reloc);
+ ret = btrfs_dec_ref(trans, root, eb, 1);
else
- ret = btrfs_dec_ref(trans, root, eb, 0,
- wc->for_reloc);
+ ret = btrfs_dec_ref(trans, root, eb, 0);
BUG_ON(ret); /* -ENOMEM */
+ ret = account_leaf_items(trans, root, eb);
+ if (ret) {
+ printk_ratelimited(KERN_ERR "BTRFS: %s Error "
+ "%d accounting leaf items. Quota "
+ "is out of sync, rescan required.\n",
+ root->fs_info->sb->s_id, ret);
+ }
}
/* make block locked assertion in clean_tree_block happy */
if (!path->locks[level] &&
@@ -7587,6 +8126,8 @@ int btrfs_drop_snapshot(struct btrfs_root *root,
int level;
bool root_dropped = false;
+ btrfs_debug(root->fs_info, "Drop subvolume %llu", root->objectid);
+
path = btrfs_alloc_path();
if (!path) {
err = -ENOMEM;
@@ -7712,9 +8253,27 @@ int btrfs_drop_snapshot(struct btrfs_root *root,
goto out_end_trans;
}
+ /*
+ * Qgroup update accounting is run from
+ * delayed ref handling. This usually works
+ * out because delayed refs are normally the
+ * only way qgroup updates are added. However,
+ * we may have added updates during our tree
+ * walk so run qgroups here to make sure we
+ * don't lose any updates.
+ */
+ ret = btrfs_delayed_qgroup_accounting(trans,
+ root->fs_info);
+ if (ret)
+ printk_ratelimited(KERN_ERR "BTRFS: Failure %d "
+ "running qgroup updates "
+ "during snapshot delete. "
+ "Quota is out of sync, "
+ "rescan required.\n", ret);
+
btrfs_end_transaction_throttle(trans, tree_root);
if (!for_reloc && btrfs_need_cleaner_sleep(root)) {
- pr_debug("btrfs: drop snapshot early exit\n");
+ pr_debug("BTRFS: drop snapshot early exit\n");
err = -EAGAIN;
goto out_free;
}
@@ -7756,7 +8315,7 @@ int btrfs_drop_snapshot(struct btrfs_root *root,
}
}
- if (root->in_radix) {
+ if (test_bit(BTRFS_ROOT_IN_RADIX, &root->state)) {
btrfs_drop_and_free_fs_root(tree_root->fs_info, root);
} else {
free_extent_buffer(root->node);
@@ -7765,6 +8324,14 @@ int btrfs_drop_snapshot(struct btrfs_root *root,
}
root_dropped = true;
out_end_trans:
+ ret = btrfs_delayed_qgroup_accounting(trans, tree_root->fs_info);
+ if (ret)
+ printk_ratelimited(KERN_ERR "BTRFS: Failure %d "
+ "running qgroup updates "
+ "during snapshot delete. "
+ "Quota is out of sync, "
+ "rescan required.\n", ret);
+
btrfs_end_transaction_throttle(trans, tree_root);
out_free:
kfree(wc);
@@ -7779,7 +8346,7 @@ out:
*/
if (!for_reloc && root_dropped == false)
btrfs_add_dead_root(root);
- if (err)
+ if (err && err != -EAGAIN)
btrfs_std_error(root->fs_info, err);
return err;
}
@@ -7868,13 +8435,7 @@ static u64 update_block_group_flags(struct btrfs_root *root, u64 flags)
if (stripped)
return extended_to_chunk(stripped);
- /*
- * we add in the count of missing devices because we want
- * to make sure that any RAID levels on a degraded FS
- * continue to be honored.
- */
- num_devices = root->fs_info->fs_devices->rw_devices +
- root->fs_info->fs_devices->missing_devices;
+ num_devices = root->fs_info->fs_devices->rw_devices;
stripped = BTRFS_BLOCK_GROUP_RAID0 |
BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6 |
@@ -8283,14 +8844,14 @@ int btrfs_free_block_groups(struct btrfs_fs_info *info)
struct btrfs_caching_control *caching_ctl;
struct rb_node *n;
- down_write(&info->extent_commit_sem);
+ down_write(&info->commit_root_sem);
while (!list_empty(&info->caching_block_groups)) {
caching_ctl = list_entry(info->caching_block_groups.next,
struct btrfs_caching_control, list);
list_del(&caching_ctl->list);
put_caching_control(caching_ctl);
}
- up_write(&info->extent_commit_sem);
+ up_write(&info->commit_root_sem);
spin_lock(&info->block_group_cache_lock);
while ((n = rb_last(&info->block_group_cache_tree)) != NULL) {
@@ -8333,6 +8894,8 @@ int btrfs_free_block_groups(struct btrfs_fs_info *info)
release_global_block_rsv(info);
while (!list_empty(&info->space_info)) {
+ int i;
+
space_info = list_entry(info->space_info.next,
struct btrfs_space_info,
list);
@@ -8343,9 +8906,18 @@ int btrfs_free_block_groups(struct btrfs_fs_info *info)
dump_space_info(space_info, 0, 0);
}
}
- percpu_counter_destroy(&space_info->total_bytes_pinned);
list_del(&space_info->list);
- kfree(space_info);
+ for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) {
+ struct kobject *kobj;
+ kobj = space_info->block_group_kobjs[i];
+ space_info->block_group_kobjs[i] = NULL;
+ if (kobj) {
+ kobject_del(kobj);
+ kobject_put(kobj);
+ }
+ }
+ kobject_del(&space_info->kobj);
+ kobject_put(&space_info->kobj);
}
return 0;
}
@@ -8354,10 +8926,71 @@ static void __link_block_group(struct btrfs_space_info *space_info,
struct btrfs_block_group_cache *cache)
{
int index = get_block_group_index(cache);
+ bool first = false;
down_write(&space_info->groups_sem);
+ if (list_empty(&space_info->block_groups[index]))
+ first = true;
list_add_tail(&cache->list, &space_info->block_groups[index]);
up_write(&space_info->groups_sem);
+
+ if (first) {
+ struct raid_kobject *rkobj;
+ int ret;
+
+ rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS);
+ if (!rkobj)
+ goto out_err;
+ rkobj->raid_type = index;
+ kobject_init(&rkobj->kobj, &btrfs_raid_ktype);
+ ret = kobject_add(&rkobj->kobj, &space_info->kobj,
+ "%s", get_raid_name(index));
+ if (ret) {
+ kobject_put(&rkobj->kobj);
+ goto out_err;
+ }
+ space_info->block_group_kobjs[index] = &rkobj->kobj;
+ }
+
+ return;
+out_err:
+ pr_warn("BTRFS: failed to add kobject for block cache. ignoring.\n");
+}
+
+static struct btrfs_block_group_cache *
+btrfs_create_block_group_cache(struct btrfs_root *root, u64 start, u64 size)
+{
+ struct btrfs_block_group_cache *cache;
+
+ cache = kzalloc(sizeof(*cache), GFP_NOFS);
+ if (!cache)
+ return NULL;
+
+ cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl),
+ GFP_NOFS);
+ if (!cache->free_space_ctl) {
+ kfree(cache);
+ return NULL;
+ }
+
+ cache->key.objectid = start;
+ cache->key.offset = size;
+ cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
+
+ cache->sectorsize = root->sectorsize;
+ cache->fs_info = root->fs_info;
+ cache->full_stripe_len = btrfs_full_stripe_len(root,
+ &root->fs_info->mapping_tree,
+ start);
+ atomic_set(&cache->count, 1);
+ spin_lock_init(&cache->lock);
+ init_rwsem(&cache->data_rwsem);
+ INIT_LIST_HEAD(&cache->list);
+ INIT_LIST_HEAD(&cache->cluster_list);
+ INIT_LIST_HEAD(&cache->new_bg_list);
+ btrfs_init_free_space_ctl(cache);
+
+ return cache;
}
int btrfs_read_block_groups(struct btrfs_root *root)
@@ -8395,26 +9028,16 @@ int btrfs_read_block_groups(struct btrfs_root *root)
break;
if (ret != 0)
goto error;
+
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
- cache = kzalloc(sizeof(*cache), GFP_NOFS);
+
+ cache = btrfs_create_block_group_cache(root, found_key.objectid,
+ found_key.offset);
if (!cache) {
ret = -ENOMEM;
goto error;
}
- cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl),
- GFP_NOFS);
- if (!cache->free_space_ctl) {
- kfree(cache);
- ret = -ENOMEM;
- goto error;
- }
-
- atomic_set(&cache->count, 1);
- spin_lock_init(&cache->lock);
- cache->fs_info = info;
- INIT_LIST_HEAD(&cache->list);
- INIT_LIST_HEAD(&cache->cluster_list);
if (need_clear) {
/*
@@ -8435,16 +9058,10 @@ int btrfs_read_block_groups(struct btrfs_root *root)
read_extent_buffer(leaf, &cache->item,
btrfs_item_ptr_offset(leaf, path->slots[0]),
sizeof(cache->item));
- memcpy(&cache->key, &found_key, sizeof(found_key));
+ cache->flags = btrfs_block_group_flags(&cache->item);
key.objectid = found_key.objectid + found_key.offset;
btrfs_release_path(path);
- cache->flags = btrfs_block_group_flags(&cache->item);
- cache->sectorsize = root->sectorsize;
- cache->full_stripe_len = btrfs_full_stripe_len(root,
- &root->fs_info->mapping_tree,
- found_key.objectid);
- btrfs_init_free_space_ctl(cache);
/*
* We need to exclude the super stripes now so that the space
@@ -8458,8 +9075,7 @@ int btrfs_read_block_groups(struct btrfs_root *root)
* case.
*/
free_excluded_extents(root, cache);
- kfree(cache->free_space_ctl);
- kfree(cache);
+ btrfs_put_block_group(cache);
goto error;
}
@@ -8588,40 +9204,17 @@ int btrfs_make_block_group(struct btrfs_trans_handle *trans,
extent_root = root->fs_info->extent_root;
- root->fs_info->last_trans_log_full_commit = trans->transid;
+ btrfs_set_log_full_commit(root->fs_info, trans);
- cache = kzalloc(sizeof(*cache), GFP_NOFS);
+ cache = btrfs_create_block_group_cache(root, chunk_offset, size);
if (!cache)
return -ENOMEM;
- cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl),
- GFP_NOFS);
- if (!cache->free_space_ctl) {
- kfree(cache);
- return -ENOMEM;
- }
-
- cache->key.objectid = chunk_offset;
- cache->key.offset = size;
- cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
- cache->sectorsize = root->sectorsize;
- cache->fs_info = root->fs_info;
- cache->full_stripe_len = btrfs_full_stripe_len(root,
- &root->fs_info->mapping_tree,
- chunk_offset);
-
- atomic_set(&cache->count, 1);
- spin_lock_init(&cache->lock);
- INIT_LIST_HEAD(&cache->list);
- INIT_LIST_HEAD(&cache->cluster_list);
- INIT_LIST_HEAD(&cache->new_bg_list);
-
- btrfs_init_free_space_ctl(cache);
btrfs_set_block_group_used(&cache->item, bytes_used);
btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid);
- cache->flags = type;
btrfs_set_block_group_flags(&cache->item, type);
+ cache->flags = type;
cache->last_byte_to_unpin = (u64)-1;
cache->cached = BTRFS_CACHE_FINISHED;
ret = exclude_super_stripes(root, cache);
@@ -8631,8 +9224,7 @@ int btrfs_make_block_group(struct btrfs_trans_handle *trans,
* case.
*/
free_excluded_extents(root, cache);
- kfree(cache->free_space_ctl);
- kfree(cache);
+ btrfs_put_block_group(cache);
return ret;
}
@@ -8698,6 +9290,7 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
struct btrfs_root *tree_root = root->fs_info->tree_root;
struct btrfs_key key;
struct inode *inode;
+ struct kobject *kobj = NULL;
int ret;
int index;
int factor;
@@ -8796,9 +9389,16 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
* are still on the list after taking the semaphore
*/
list_del_init(&block_group->list);
- if (list_empty(&block_group->space_info->block_groups[index]))
+ if (list_empty(&block_group->space_info->block_groups[index])) {
+ kobj = block_group->space_info->block_group_kobjs[index];
+ block_group->space_info->block_group_kobjs[index] = NULL;
clear_avail_alloc_bits(root->fs_info, block_group->flags);
+ }
up_write(&block_group->space_info->groups_sem);
+ if (kobj) {
+ kobject_del(kobj);
+ kobject_put(kobj);
+ }
if (block_group->cached == BTRFS_CACHE_STARTED)
wait_block_group_cache_done(block_group);
@@ -8940,3 +9540,38 @@ int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range)
range->len = trimmed;
return ret;
}
+
+/*
+ * btrfs_{start,end}_write() is similar to mnt_{want, drop}_write(),
+ * they are used to prevent the some tasks writing data into the page cache
+ * by nocow before the subvolume is snapshoted, but flush the data into
+ * the disk after the snapshot creation.
+ */
+void btrfs_end_nocow_write(struct btrfs_root *root)
+{
+ percpu_counter_dec(&root->subv_writers->counter);
+ /*
+ * Make sure counter is updated before we wake up
+ * waiters.
+ */
+ smp_mb();
+ if (waitqueue_active(&root->subv_writers->wait))
+ wake_up(&root->subv_writers->wait);
+}
+
+int btrfs_start_nocow_write(struct btrfs_root *root)
+{
+ if (unlikely(atomic_read(&root->will_be_snapshoted)))
+ return 0;
+
+ percpu_counter_inc(&root->subv_writers->counter);
+ /*
+ * Make sure counter is updated before we check for snapshot creation.
+ */
+ smp_mb();
+ if (unlikely(atomic_read(&root->will_be_snapshoted))) {
+ btrfs_end_nocow_write(root);
+ return 0;
+ }
+ return 1;
+}
OpenPOWER on IntegriCloud