![Goldwyn Rodrigues](/assets/img/avatar_default.png)
We don't need an if-else-if chain where we can use a simple OR since both conditions are performing the same action. The short-circuit for OR will ensure that if the first condition is true, can_overcommit() is not called. Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
1095 lines
31 KiB
C
1095 lines
31 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
#include "ctree.h"
|
|
#include "space-info.h"
|
|
#include "sysfs.h"
|
|
#include "volumes.h"
|
|
#include "free-space-cache.h"
|
|
#include "ordered-data.h"
|
|
#include "transaction.h"
|
|
#include "math.h"
|
|
|
|
u64 btrfs_space_info_used(struct btrfs_space_info *s_info,
|
|
bool may_use_included)
|
|
{
|
|
ASSERT(s_info);
|
|
return s_info->bytes_used + s_info->bytes_reserved +
|
|
s_info->bytes_pinned + s_info->bytes_readonly +
|
|
(may_use_included ? s_info->bytes_may_use : 0);
|
|
}
|
|
|
|
/*
|
|
* after adding space to the filesystem, we need to clear the full flags
|
|
* on all the space infos.
|
|
*/
|
|
void btrfs_clear_space_info_full(struct btrfs_fs_info *info)
|
|
{
|
|
struct list_head *head = &info->space_info;
|
|
struct btrfs_space_info *found;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(found, head, list)
|
|
found->full = 0;
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static 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 create_space_info(struct btrfs_fs_info *info, u64 flags)
|
|
{
|
|
|
|
struct btrfs_space_info *space_info;
|
|
int i;
|
|
int ret;
|
|
|
|
space_info = kzalloc(sizeof(*space_info), GFP_NOFS);
|
|
if (!space_info)
|
|
return -ENOMEM;
|
|
|
|
ret = percpu_counter_init(&space_info->total_bytes_pinned, 0,
|
|
GFP_KERNEL);
|
|
if (ret) {
|
|
kfree(space_info);
|
|
return ret;
|
|
}
|
|
|
|
for (i = 0; i < BTRFS_NR_RAID_TYPES; i++)
|
|
INIT_LIST_HEAD(&space_info->block_groups[i]);
|
|
init_rwsem(&space_info->groups_sem);
|
|
spin_lock_init(&space_info->lock);
|
|
space_info->flags = flags & BTRFS_BLOCK_GROUP_TYPE_MASK;
|
|
space_info->force_alloc = CHUNK_ALLOC_NO_FORCE;
|
|
init_waitqueue_head(&space_info->wait);
|
|
INIT_LIST_HEAD(&space_info->ro_bgs);
|
|
INIT_LIST_HEAD(&space_info->tickets);
|
|
INIT_LIST_HEAD(&space_info->priority_tickets);
|
|
|
|
ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype,
|
|
info->space_info_kobj, "%s",
|
|
alloc_name(space_info->flags));
|
|
if (ret) {
|
|
kobject_put(&space_info->kobj);
|
|
return ret;
|
|
}
|
|
|
|
list_add_rcu(&space_info->list, &info->space_info);
|
|
if (flags & BTRFS_BLOCK_GROUP_DATA)
|
|
info->data_sinfo = space_info;
|
|
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_init_space_info(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_super_block *disk_super;
|
|
u64 features;
|
|
u64 flags;
|
|
int mixed = 0;
|
|
int ret;
|
|
|
|
disk_super = fs_info->super_copy;
|
|
if (!btrfs_super_root(disk_super))
|
|
return -EINVAL;
|
|
|
|
features = btrfs_super_incompat_flags(disk_super);
|
|
if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS)
|
|
mixed = 1;
|
|
|
|
flags = BTRFS_BLOCK_GROUP_SYSTEM;
|
|
ret = create_space_info(fs_info, flags);
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (mixed) {
|
|
flags = BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA;
|
|
ret = create_space_info(fs_info, flags);
|
|
} else {
|
|
flags = BTRFS_BLOCK_GROUP_METADATA;
|
|
ret = create_space_info(fs_info, flags);
|
|
if (ret)
|
|
goto out;
|
|
|
|
flags = BTRFS_BLOCK_GROUP_DATA;
|
|
ret = create_space_info(fs_info, flags);
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
void btrfs_update_space_info(struct btrfs_fs_info *info, u64 flags,
|
|
u64 total_bytes, u64 bytes_used,
|
|
u64 bytes_readonly,
|
|
struct btrfs_space_info **space_info)
|
|
{
|
|
struct btrfs_space_info *found;
|
|
int factor;
|
|
|
|
factor = btrfs_bg_type_to_factor(flags);
|
|
|
|
found = btrfs_find_space_info(info, flags);
|
|
ASSERT(found);
|
|
spin_lock(&found->lock);
|
|
found->total_bytes += total_bytes;
|
|
found->disk_total += total_bytes * factor;
|
|
found->bytes_used += bytes_used;
|
|
found->disk_used += bytes_used * factor;
|
|
found->bytes_readonly += bytes_readonly;
|
|
if (total_bytes > 0)
|
|
found->full = 0;
|
|
btrfs_space_info_add_new_bytes(info, found,
|
|
total_bytes - bytes_used -
|
|
bytes_readonly);
|
|
spin_unlock(&found->lock);
|
|
*space_info = found;
|
|
}
|
|
|
|
struct btrfs_space_info *btrfs_find_space_info(struct btrfs_fs_info *info,
|
|
u64 flags)
|
|
{
|
|
struct list_head *head = &info->space_info;
|
|
struct btrfs_space_info *found;
|
|
|
|
flags &= BTRFS_BLOCK_GROUP_TYPE_MASK;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(found, head, list) {
|
|
if (found->flags & flags) {
|
|
rcu_read_unlock();
|
|
return found;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
return NULL;
|
|
}
|
|
|
|
static inline u64 calc_global_rsv_need_space(struct btrfs_block_rsv *global)
|
|
{
|
|
return (global->size << 1);
|
|
}
|
|
|
|
static int can_overcommit(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info, u64 bytes,
|
|
enum btrfs_reserve_flush_enum flush,
|
|
bool system_chunk)
|
|
{
|
|
struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
|
|
u64 profile;
|
|
u64 space_size;
|
|
u64 avail;
|
|
u64 used;
|
|
int factor;
|
|
|
|
/* Don't overcommit when in mixed mode. */
|
|
if (space_info->flags & BTRFS_BLOCK_GROUP_DATA)
|
|
return 0;
|
|
|
|
if (system_chunk)
|
|
profile = btrfs_system_alloc_profile(fs_info);
|
|
else
|
|
profile = btrfs_metadata_alloc_profile(fs_info);
|
|
|
|
used = btrfs_space_info_used(space_info, false);
|
|
|
|
/*
|
|
* We only want to allow over committing if we have lots of actual space
|
|
* free, but if we don't have enough space to handle the global reserve
|
|
* space then we could end up having a real enospc problem when trying
|
|
* to allocate a chunk or some other such important allocation.
|
|
*/
|
|
spin_lock(&global_rsv->lock);
|
|
space_size = calc_global_rsv_need_space(global_rsv);
|
|
spin_unlock(&global_rsv->lock);
|
|
if (used + space_size >= space_info->total_bytes)
|
|
return 0;
|
|
|
|
used += space_info->bytes_may_use;
|
|
|
|
avail = atomic64_read(&fs_info->free_chunk_space);
|
|
|
|
/*
|
|
* If we have dup, raid1 or raid10 then only half of the free
|
|
* space is actually usable. For raid56, the space info used
|
|
* doesn't include the parity drive, so we don't have to
|
|
* change the math
|
|
*/
|
|
factor = btrfs_bg_type_to_factor(profile);
|
|
avail = div_u64(avail, factor);
|
|
|
|
/*
|
|
* If we aren't flushing all things, let us overcommit up to
|
|
* 1/2th of the space. If we can flush, don't let us overcommit
|
|
* too much, let it overcommit up to 1/8 of the space.
|
|
*/
|
|
if (flush == BTRFS_RESERVE_FLUSH_ALL)
|
|
avail >>= 3;
|
|
else
|
|
avail >>= 1;
|
|
|
|
if (used + bytes < space_info->total_bytes + avail)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This is for space we already have accounted in space_info->bytes_may_use, so
|
|
* basically when we're returning space from block_rsv's.
|
|
*/
|
|
void btrfs_space_info_add_old_bytes(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info,
|
|
u64 num_bytes)
|
|
{
|
|
struct reserve_ticket *ticket;
|
|
struct list_head *head;
|
|
u64 used;
|
|
enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_NO_FLUSH;
|
|
bool check_overcommit = false;
|
|
|
|
spin_lock(&space_info->lock);
|
|
head = &space_info->priority_tickets;
|
|
|
|
/*
|
|
* If we are over our limit then we need to check and see if we can
|
|
* overcommit, and if we can't then we just need to free up our space
|
|
* and not satisfy any requests.
|
|
*/
|
|
used = btrfs_space_info_used(space_info, true);
|
|
if (used - num_bytes >= space_info->total_bytes)
|
|
check_overcommit = true;
|
|
again:
|
|
while (!list_empty(head) && num_bytes) {
|
|
ticket = list_first_entry(head, struct reserve_ticket,
|
|
list);
|
|
/*
|
|
* We use 0 bytes because this space is already reserved, so
|
|
* adding the ticket space would be a double count.
|
|
*/
|
|
if (check_overcommit &&
|
|
!can_overcommit(fs_info, space_info, 0, flush, false))
|
|
break;
|
|
if (num_bytes >= ticket->bytes) {
|
|
list_del_init(&ticket->list);
|
|
num_bytes -= ticket->bytes;
|
|
ticket->bytes = 0;
|
|
space_info->tickets_id++;
|
|
wake_up(&ticket->wait);
|
|
} else {
|
|
ticket->bytes -= num_bytes;
|
|
num_bytes = 0;
|
|
}
|
|
}
|
|
|
|
if (num_bytes && head == &space_info->priority_tickets) {
|
|
head = &space_info->tickets;
|
|
flush = BTRFS_RESERVE_FLUSH_ALL;
|
|
goto again;
|
|
}
|
|
btrfs_space_info_update_bytes_may_use(fs_info, space_info, -num_bytes);
|
|
trace_btrfs_space_reservation(fs_info, "space_info",
|
|
space_info->flags, num_bytes, 0);
|
|
spin_unlock(&space_info->lock);
|
|
}
|
|
|
|
/*
|
|
* This is for newly allocated space that isn't accounted in
|
|
* space_info->bytes_may_use yet. So if we allocate a chunk or unpin an extent
|
|
* we use this helper.
|
|
*/
|
|
void btrfs_space_info_add_new_bytes(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info,
|
|
u64 num_bytes)
|
|
{
|
|
struct reserve_ticket *ticket;
|
|
struct list_head *head = &space_info->priority_tickets;
|
|
|
|
again:
|
|
while (!list_empty(head) && num_bytes) {
|
|
ticket = list_first_entry(head, struct reserve_ticket,
|
|
list);
|
|
if (num_bytes >= ticket->bytes) {
|
|
trace_btrfs_space_reservation(fs_info, "space_info",
|
|
space_info->flags,
|
|
ticket->bytes, 1);
|
|
list_del_init(&ticket->list);
|
|
num_bytes -= ticket->bytes;
|
|
btrfs_space_info_update_bytes_may_use(fs_info,
|
|
space_info,
|
|
ticket->bytes);
|
|
ticket->bytes = 0;
|
|
space_info->tickets_id++;
|
|
wake_up(&ticket->wait);
|
|
} else {
|
|
trace_btrfs_space_reservation(fs_info, "space_info",
|
|
space_info->flags,
|
|
num_bytes, 1);
|
|
btrfs_space_info_update_bytes_may_use(fs_info,
|
|
space_info,
|
|
num_bytes);
|
|
ticket->bytes -= num_bytes;
|
|
num_bytes = 0;
|
|
}
|
|
}
|
|
|
|
if (num_bytes && head == &space_info->priority_tickets) {
|
|
head = &space_info->tickets;
|
|
goto again;
|
|
}
|
|
}
|
|
|
|
#define DUMP_BLOCK_RSV(fs_info, rsv_name) \
|
|
do { \
|
|
struct btrfs_block_rsv *__rsv = &(fs_info)->rsv_name; \
|
|
spin_lock(&__rsv->lock); \
|
|
btrfs_info(fs_info, #rsv_name ": size %llu reserved %llu", \
|
|
__rsv->size, __rsv->reserved); \
|
|
spin_unlock(&__rsv->lock); \
|
|
} while (0)
|
|
|
|
void btrfs_dump_space_info(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *info, u64 bytes,
|
|
int dump_block_groups)
|
|
{
|
|
struct btrfs_block_group_cache *cache;
|
|
int index = 0;
|
|
|
|
spin_lock(&info->lock);
|
|
btrfs_info(fs_info, "space_info %llu has %llu free, is %sfull",
|
|
info->flags,
|
|
info->total_bytes - btrfs_space_info_used(info, true),
|
|
info->full ? "" : "not ");
|
|
btrfs_info(fs_info,
|
|
"space_info total=%llu, used=%llu, pinned=%llu, reserved=%llu, may_use=%llu, readonly=%llu",
|
|
info->total_bytes, info->bytes_used, info->bytes_pinned,
|
|
info->bytes_reserved, info->bytes_may_use,
|
|
info->bytes_readonly);
|
|
spin_unlock(&info->lock);
|
|
|
|
DUMP_BLOCK_RSV(fs_info, global_block_rsv);
|
|
DUMP_BLOCK_RSV(fs_info, trans_block_rsv);
|
|
DUMP_BLOCK_RSV(fs_info, chunk_block_rsv);
|
|
DUMP_BLOCK_RSV(fs_info, delayed_block_rsv);
|
|
DUMP_BLOCK_RSV(fs_info, delayed_refs_rsv);
|
|
|
|
if (!dump_block_groups)
|
|
return;
|
|
|
|
down_read(&info->groups_sem);
|
|
again:
|
|
list_for_each_entry(cache, &info->block_groups[index], list) {
|
|
spin_lock(&cache->lock);
|
|
btrfs_info(fs_info,
|
|
"block group %llu has %llu bytes, %llu used %llu pinned %llu reserved %s",
|
|
cache->key.objectid, cache->key.offset,
|
|
btrfs_block_group_used(&cache->item), cache->pinned,
|
|
cache->reserved, cache->ro ? "[readonly]" : "");
|
|
btrfs_dump_free_space(cache, bytes);
|
|
spin_unlock(&cache->lock);
|
|
}
|
|
if (++index < BTRFS_NR_RAID_TYPES)
|
|
goto again;
|
|
up_read(&info->groups_sem);
|
|
}
|
|
|
|
static void btrfs_writeback_inodes_sb_nr(struct btrfs_fs_info *fs_info,
|
|
unsigned long nr_pages, int nr_items)
|
|
{
|
|
struct super_block *sb = fs_info->sb;
|
|
|
|
if (down_read_trylock(&sb->s_umount)) {
|
|
writeback_inodes_sb_nr(sb, nr_pages, WB_REASON_FS_FREE_SPACE);
|
|
up_read(&sb->s_umount);
|
|
} else {
|
|
/*
|
|
* We needn't worry the filesystem going from r/w to r/o though
|
|
* we don't acquire ->s_umount mutex, because the filesystem
|
|
* should guarantee the delalloc inodes list be empty after
|
|
* the filesystem is readonly(all dirty pages are written to
|
|
* the disk).
|
|
*/
|
|
btrfs_start_delalloc_roots(fs_info, nr_items);
|
|
if (!current->journal_info)
|
|
btrfs_wait_ordered_roots(fs_info, nr_items, 0, (u64)-1);
|
|
}
|
|
}
|
|
|
|
static inline u64 calc_reclaim_items_nr(struct btrfs_fs_info *fs_info,
|
|
u64 to_reclaim)
|
|
{
|
|
u64 bytes;
|
|
u64 nr;
|
|
|
|
bytes = btrfs_calc_trans_metadata_size(fs_info, 1);
|
|
nr = div64_u64(to_reclaim, bytes);
|
|
if (!nr)
|
|
nr = 1;
|
|
return nr;
|
|
}
|
|
|
|
#define EXTENT_SIZE_PER_ITEM SZ_256K
|
|
|
|
/*
|
|
* shrink metadata reservation for delalloc
|
|
*/
|
|
static void shrink_delalloc(struct btrfs_fs_info *fs_info, u64 to_reclaim,
|
|
u64 orig, bool wait_ordered)
|
|
{
|
|
struct btrfs_space_info *space_info;
|
|
struct btrfs_trans_handle *trans;
|
|
u64 delalloc_bytes;
|
|
u64 dio_bytes;
|
|
u64 async_pages;
|
|
u64 items;
|
|
long time_left;
|
|
unsigned long nr_pages;
|
|
int loops;
|
|
|
|
/* Calc the number of the pages we need flush for space reservation */
|
|
items = calc_reclaim_items_nr(fs_info, to_reclaim);
|
|
to_reclaim = items * EXTENT_SIZE_PER_ITEM;
|
|
|
|
trans = (struct btrfs_trans_handle *)current->journal_info;
|
|
space_info = btrfs_find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA);
|
|
|
|
delalloc_bytes = percpu_counter_sum_positive(
|
|
&fs_info->delalloc_bytes);
|
|
dio_bytes = percpu_counter_sum_positive(&fs_info->dio_bytes);
|
|
if (delalloc_bytes == 0 && dio_bytes == 0) {
|
|
if (trans)
|
|
return;
|
|
if (wait_ordered)
|
|
btrfs_wait_ordered_roots(fs_info, items, 0, (u64)-1);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* If we are doing more ordered than delalloc we need to just wait on
|
|
* ordered extents, otherwise we'll waste time trying to flush delalloc
|
|
* that likely won't give us the space back we need.
|
|
*/
|
|
if (dio_bytes > delalloc_bytes)
|
|
wait_ordered = true;
|
|
|
|
loops = 0;
|
|
while ((delalloc_bytes || dio_bytes) && loops < 3) {
|
|
nr_pages = min(delalloc_bytes, to_reclaim) >> PAGE_SHIFT;
|
|
|
|
/*
|
|
* Triggers inode writeback for up to nr_pages. This will invoke
|
|
* ->writepages callback and trigger delalloc filling
|
|
* (btrfs_run_delalloc_range()).
|
|
*/
|
|
btrfs_writeback_inodes_sb_nr(fs_info, nr_pages, items);
|
|
|
|
/*
|
|
* We need to wait for the compressed pages to start before
|
|
* we continue.
|
|
*/
|
|
async_pages = atomic_read(&fs_info->async_delalloc_pages);
|
|
if (!async_pages)
|
|
goto skip_async;
|
|
|
|
/*
|
|
* Calculate how many compressed pages we want to be written
|
|
* before we continue. I.e if there are more async pages than we
|
|
* require wait_event will wait until nr_pages are written.
|
|
*/
|
|
if (async_pages <= nr_pages)
|
|
async_pages = 0;
|
|
else
|
|
async_pages -= nr_pages;
|
|
|
|
wait_event(fs_info->async_submit_wait,
|
|
atomic_read(&fs_info->async_delalloc_pages) <=
|
|
(int)async_pages);
|
|
skip_async:
|
|
spin_lock(&space_info->lock);
|
|
if (list_empty(&space_info->tickets) &&
|
|
list_empty(&space_info->priority_tickets)) {
|
|
spin_unlock(&space_info->lock);
|
|
break;
|
|
}
|
|
spin_unlock(&space_info->lock);
|
|
|
|
loops++;
|
|
if (wait_ordered && !trans) {
|
|
btrfs_wait_ordered_roots(fs_info, items, 0, (u64)-1);
|
|
} else {
|
|
time_left = schedule_timeout_killable(1);
|
|
if (time_left)
|
|
break;
|
|
}
|
|
delalloc_bytes = percpu_counter_sum_positive(
|
|
&fs_info->delalloc_bytes);
|
|
dio_bytes = percpu_counter_sum_positive(&fs_info->dio_bytes);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* maybe_commit_transaction - possibly commit the transaction if its ok to
|
|
* @root - the root we're allocating for
|
|
* @bytes - the number of bytes we want to reserve
|
|
* @force - force the commit
|
|
*
|
|
* This will check to make sure that committing the transaction will actually
|
|
* get us somewhere and then commit the transaction if it does. Otherwise it
|
|
* will return -ENOSPC.
|
|
*/
|
|
static int may_commit_transaction(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info)
|
|
{
|
|
struct reserve_ticket *ticket = NULL;
|
|
struct btrfs_block_rsv *delayed_rsv = &fs_info->delayed_block_rsv;
|
|
struct btrfs_block_rsv *delayed_refs_rsv = &fs_info->delayed_refs_rsv;
|
|
struct btrfs_trans_handle *trans;
|
|
u64 bytes_needed;
|
|
u64 reclaim_bytes = 0;
|
|
|
|
trans = (struct btrfs_trans_handle *)current->journal_info;
|
|
if (trans)
|
|
return -EAGAIN;
|
|
|
|
spin_lock(&space_info->lock);
|
|
if (!list_empty(&space_info->priority_tickets))
|
|
ticket = list_first_entry(&space_info->priority_tickets,
|
|
struct reserve_ticket, list);
|
|
else if (!list_empty(&space_info->tickets))
|
|
ticket = list_first_entry(&space_info->tickets,
|
|
struct reserve_ticket, list);
|
|
bytes_needed = (ticket) ? ticket->bytes : 0;
|
|
spin_unlock(&space_info->lock);
|
|
|
|
if (!bytes_needed)
|
|
return 0;
|
|
|
|
trans = btrfs_join_transaction(fs_info->extent_root);
|
|
if (IS_ERR(trans))
|
|
return PTR_ERR(trans);
|
|
|
|
/*
|
|
* See if there is enough pinned space to make this reservation, or if
|
|
* we have block groups that are going to be freed, allowing us to
|
|
* possibly do a chunk allocation the next loop through.
|
|
*/
|
|
if (test_bit(BTRFS_TRANS_HAVE_FREE_BGS, &trans->transaction->flags) ||
|
|
__percpu_counter_compare(&space_info->total_bytes_pinned,
|
|
bytes_needed,
|
|
BTRFS_TOTAL_BYTES_PINNED_BATCH) >= 0)
|
|
goto commit;
|
|
|
|
/*
|
|
* See if there is some space in the delayed insertion reservation for
|
|
* this reservation.
|
|
*/
|
|
if (space_info != delayed_rsv->space_info)
|
|
goto enospc;
|
|
|
|
spin_lock(&delayed_rsv->lock);
|
|
reclaim_bytes += delayed_rsv->reserved;
|
|
spin_unlock(&delayed_rsv->lock);
|
|
|
|
spin_lock(&delayed_refs_rsv->lock);
|
|
reclaim_bytes += delayed_refs_rsv->reserved;
|
|
spin_unlock(&delayed_refs_rsv->lock);
|
|
if (reclaim_bytes >= bytes_needed)
|
|
goto commit;
|
|
bytes_needed -= reclaim_bytes;
|
|
|
|
if (__percpu_counter_compare(&space_info->total_bytes_pinned,
|
|
bytes_needed,
|
|
BTRFS_TOTAL_BYTES_PINNED_BATCH) < 0)
|
|
goto enospc;
|
|
|
|
commit:
|
|
return btrfs_commit_transaction(trans);
|
|
enospc:
|
|
btrfs_end_transaction(trans);
|
|
return -ENOSPC;
|
|
}
|
|
|
|
/*
|
|
* Try to flush some data based on policy set by @state. This is only advisory
|
|
* and may fail for various reasons. The caller is supposed to examine the
|
|
* state of @space_info to detect the outcome.
|
|
*/
|
|
static void flush_space(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info, u64 num_bytes,
|
|
int state)
|
|
{
|
|
struct btrfs_root *root = fs_info->extent_root;
|
|
struct btrfs_trans_handle *trans;
|
|
int nr;
|
|
int ret = 0;
|
|
|
|
switch (state) {
|
|
case FLUSH_DELAYED_ITEMS_NR:
|
|
case FLUSH_DELAYED_ITEMS:
|
|
if (state == FLUSH_DELAYED_ITEMS_NR)
|
|
nr = calc_reclaim_items_nr(fs_info, num_bytes) * 2;
|
|
else
|
|
nr = -1;
|
|
|
|
trans = btrfs_join_transaction(root);
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
break;
|
|
}
|
|
ret = btrfs_run_delayed_items_nr(trans, nr);
|
|
btrfs_end_transaction(trans);
|
|
break;
|
|
case FLUSH_DELALLOC:
|
|
case FLUSH_DELALLOC_WAIT:
|
|
shrink_delalloc(fs_info, num_bytes * 2, num_bytes,
|
|
state == FLUSH_DELALLOC_WAIT);
|
|
break;
|
|
case FLUSH_DELAYED_REFS_NR:
|
|
case FLUSH_DELAYED_REFS:
|
|
trans = btrfs_join_transaction(root);
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
break;
|
|
}
|
|
if (state == FLUSH_DELAYED_REFS_NR)
|
|
nr = calc_reclaim_items_nr(fs_info, num_bytes);
|
|
else
|
|
nr = 0;
|
|
btrfs_run_delayed_refs(trans, nr);
|
|
btrfs_end_transaction(trans);
|
|
break;
|
|
case ALLOC_CHUNK:
|
|
case ALLOC_CHUNK_FORCE:
|
|
trans = btrfs_join_transaction(root);
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
break;
|
|
}
|
|
ret = btrfs_chunk_alloc(trans,
|
|
btrfs_metadata_alloc_profile(fs_info),
|
|
(state == ALLOC_CHUNK) ? CHUNK_ALLOC_NO_FORCE :
|
|
CHUNK_ALLOC_FORCE);
|
|
btrfs_end_transaction(trans);
|
|
if (ret > 0 || ret == -ENOSPC)
|
|
ret = 0;
|
|
break;
|
|
case COMMIT_TRANS:
|
|
/*
|
|
* If we have pending delayed iputs then we could free up a
|
|
* bunch of pinned space, so make sure we run the iputs before
|
|
* we do our pinned bytes check below.
|
|
*/
|
|
btrfs_run_delayed_iputs(fs_info);
|
|
btrfs_wait_on_delayed_iputs(fs_info);
|
|
|
|
ret = may_commit_transaction(fs_info, space_info);
|
|
break;
|
|
default:
|
|
ret = -ENOSPC;
|
|
break;
|
|
}
|
|
|
|
trace_btrfs_flush_space(fs_info, space_info->flags, num_bytes, state,
|
|
ret);
|
|
return;
|
|
}
|
|
|
|
static inline u64
|
|
btrfs_calc_reclaim_metadata_size(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info,
|
|
bool system_chunk)
|
|
{
|
|
struct reserve_ticket *ticket;
|
|
u64 used;
|
|
u64 expected;
|
|
u64 to_reclaim = 0;
|
|
|
|
list_for_each_entry(ticket, &space_info->tickets, list)
|
|
to_reclaim += ticket->bytes;
|
|
list_for_each_entry(ticket, &space_info->priority_tickets, list)
|
|
to_reclaim += ticket->bytes;
|
|
if (to_reclaim)
|
|
return to_reclaim;
|
|
|
|
to_reclaim = min_t(u64, num_online_cpus() * SZ_1M, SZ_16M);
|
|
if (can_overcommit(fs_info, space_info, to_reclaim,
|
|
BTRFS_RESERVE_FLUSH_ALL, system_chunk))
|
|
return 0;
|
|
|
|
used = btrfs_space_info_used(space_info, true);
|
|
|
|
if (can_overcommit(fs_info, space_info, SZ_1M,
|
|
BTRFS_RESERVE_FLUSH_ALL, system_chunk))
|
|
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);
|
|
return to_reclaim;
|
|
}
|
|
|
|
static inline int need_do_async_reclaim(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info,
|
|
u64 used, bool system_chunk)
|
|
{
|
|
u64 thresh = div_factor_fine(space_info->total_bytes, 98);
|
|
|
|
/* If we're just plain full then async reclaim just slows us down. */
|
|
if ((space_info->bytes_used + space_info->bytes_reserved) >= thresh)
|
|
return 0;
|
|
|
|
if (!btrfs_calc_reclaim_metadata_size(fs_info, space_info,
|
|
system_chunk))
|
|
return 0;
|
|
|
|
return (used >= thresh && !btrfs_fs_closing(fs_info) &&
|
|
!test_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state));
|
|
}
|
|
|
|
static bool wake_all_tickets(struct list_head *head)
|
|
{
|
|
struct reserve_ticket *ticket;
|
|
|
|
while (!list_empty(head)) {
|
|
ticket = list_first_entry(head, struct reserve_ticket, list);
|
|
list_del_init(&ticket->list);
|
|
ticket->error = -ENOSPC;
|
|
wake_up(&ticket->wait);
|
|
if (ticket->bytes != ticket->orig_bytes)
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* This is for normal flushers, we can wait all goddamned day if we want to. We
|
|
* will loop and continuously try to flush as long as we are making progress.
|
|
* We count progress as clearing off tickets each time we have to loop.
|
|
*/
|
|
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;
|
|
int commit_cycles = 0;
|
|
u64 last_tickets_id;
|
|
|
|
fs_info = container_of(work, struct btrfs_fs_info, async_reclaim_work);
|
|
space_info = btrfs_find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA);
|
|
|
|
spin_lock(&space_info->lock);
|
|
to_reclaim = btrfs_calc_reclaim_metadata_size(fs_info, space_info,
|
|
false);
|
|
if (!to_reclaim) {
|
|
space_info->flush = 0;
|
|
spin_unlock(&space_info->lock);
|
|
return;
|
|
}
|
|
last_tickets_id = space_info->tickets_id;
|
|
spin_unlock(&space_info->lock);
|
|
|
|
flush_state = FLUSH_DELAYED_ITEMS_NR;
|
|
do {
|
|
flush_space(fs_info, space_info, to_reclaim, flush_state);
|
|
spin_lock(&space_info->lock);
|
|
if (list_empty(&space_info->tickets)) {
|
|
space_info->flush = 0;
|
|
spin_unlock(&space_info->lock);
|
|
return;
|
|
}
|
|
to_reclaim = btrfs_calc_reclaim_metadata_size(fs_info,
|
|
space_info,
|
|
false);
|
|
if (last_tickets_id == space_info->tickets_id) {
|
|
flush_state++;
|
|
} else {
|
|
last_tickets_id = space_info->tickets_id;
|
|
flush_state = FLUSH_DELAYED_ITEMS_NR;
|
|
if (commit_cycles)
|
|
commit_cycles--;
|
|
}
|
|
|
|
/*
|
|
* We don't want to force a chunk allocation until we've tried
|
|
* pretty hard to reclaim space. Think of the case where we
|
|
* freed up a bunch of space and so have a lot of pinned space
|
|
* to reclaim. We would rather use that than possibly create a
|
|
* underutilized metadata chunk. So if this is our first run
|
|
* through the flushing state machine skip ALLOC_CHUNK_FORCE and
|
|
* commit the transaction. If nothing has changed the next go
|
|
* around then we can force a chunk allocation.
|
|
*/
|
|
if (flush_state == ALLOC_CHUNK_FORCE && !commit_cycles)
|
|
flush_state++;
|
|
|
|
if (flush_state > COMMIT_TRANS) {
|
|
commit_cycles++;
|
|
if (commit_cycles > 2) {
|
|
if (wake_all_tickets(&space_info->tickets)) {
|
|
flush_state = FLUSH_DELAYED_ITEMS_NR;
|
|
commit_cycles--;
|
|
} else {
|
|
space_info->flush = 0;
|
|
}
|
|
} else {
|
|
flush_state = FLUSH_DELAYED_ITEMS_NR;
|
|
}
|
|
}
|
|
spin_unlock(&space_info->lock);
|
|
} while (flush_state <= COMMIT_TRANS);
|
|
}
|
|
|
|
void btrfs_init_async_reclaim_work(struct work_struct *work)
|
|
{
|
|
INIT_WORK(work, btrfs_async_reclaim_metadata_space);
|
|
}
|
|
|
|
static const enum btrfs_flush_state priority_flush_states[] = {
|
|
FLUSH_DELAYED_ITEMS_NR,
|
|
FLUSH_DELAYED_ITEMS,
|
|
ALLOC_CHUNK,
|
|
};
|
|
|
|
static void priority_reclaim_metadata_space(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info,
|
|
struct reserve_ticket *ticket)
|
|
{
|
|
u64 to_reclaim;
|
|
int flush_state;
|
|
|
|
spin_lock(&space_info->lock);
|
|
to_reclaim = btrfs_calc_reclaim_metadata_size(fs_info, space_info,
|
|
false);
|
|
if (!to_reclaim) {
|
|
spin_unlock(&space_info->lock);
|
|
return;
|
|
}
|
|
spin_unlock(&space_info->lock);
|
|
|
|
flush_state = 0;
|
|
do {
|
|
flush_space(fs_info, space_info, to_reclaim,
|
|
priority_flush_states[flush_state]);
|
|
flush_state++;
|
|
spin_lock(&space_info->lock);
|
|
if (ticket->bytes == 0) {
|
|
spin_unlock(&space_info->lock);
|
|
return;
|
|
}
|
|
spin_unlock(&space_info->lock);
|
|
} while (flush_state < ARRAY_SIZE(priority_flush_states));
|
|
}
|
|
|
|
static int wait_reserve_ticket(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info,
|
|
struct reserve_ticket *ticket)
|
|
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
u64 reclaim_bytes = 0;
|
|
int ret = 0;
|
|
|
|
spin_lock(&space_info->lock);
|
|
while (ticket->bytes > 0 && ticket->error == 0) {
|
|
ret = prepare_to_wait_event(&ticket->wait, &wait, TASK_KILLABLE);
|
|
if (ret) {
|
|
ret = -EINTR;
|
|
break;
|
|
}
|
|
spin_unlock(&space_info->lock);
|
|
|
|
schedule();
|
|
|
|
finish_wait(&ticket->wait, &wait);
|
|
spin_lock(&space_info->lock);
|
|
}
|
|
if (!ret)
|
|
ret = ticket->error;
|
|
if (!list_empty(&ticket->list))
|
|
list_del_init(&ticket->list);
|
|
if (ticket->bytes && ticket->bytes < ticket->orig_bytes)
|
|
reclaim_bytes = ticket->orig_bytes - ticket->bytes;
|
|
spin_unlock(&space_info->lock);
|
|
|
|
if (reclaim_bytes)
|
|
btrfs_space_info_add_old_bytes(fs_info, space_info,
|
|
reclaim_bytes);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* reserve_metadata_bytes - try to reserve bytes from the block_rsv's space
|
|
* @root - the root we're allocating for
|
|
* @space_info - the space info we want to allocate from
|
|
* @orig_bytes - the number of bytes we want
|
|
* @flush - whether or not we can flush to make our reservation
|
|
*
|
|
* This will reserve orig_bytes number of bytes from the space info associated
|
|
* with the block_rsv. If there is not enough space it will make an attempt to
|
|
* flush out space to make room. It will do this by flushing delalloc if
|
|
* possible or committing the transaction. If flush is 0 then no attempts to
|
|
* regain reservations will be made and this will fail if there is not enough
|
|
* space already.
|
|
*/
|
|
static int __reserve_metadata_bytes(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info,
|
|
u64 orig_bytes,
|
|
enum btrfs_reserve_flush_enum flush,
|
|
bool system_chunk)
|
|
{
|
|
struct reserve_ticket ticket;
|
|
u64 used;
|
|
u64 reclaim_bytes = 0;
|
|
int ret = 0;
|
|
|
|
ASSERT(orig_bytes);
|
|
ASSERT(!current->journal_info || flush != BTRFS_RESERVE_FLUSH_ALL);
|
|
|
|
spin_lock(&space_info->lock);
|
|
ret = -ENOSPC;
|
|
used = btrfs_space_info_used(space_info, true);
|
|
|
|
/*
|
|
* Carry on if we have enough space (short-circuit) OR call
|
|
* can_overcommit() to ensure we can overcommit to continue.
|
|
*/
|
|
if ((used + orig_bytes <= space_info->total_bytes) ||
|
|
can_overcommit(fs_info, space_info, orig_bytes, flush,
|
|
system_chunk)) {
|
|
btrfs_space_info_update_bytes_may_use(fs_info, space_info,
|
|
orig_bytes);
|
|
trace_btrfs_space_reservation(fs_info, "space_info",
|
|
space_info->flags, orig_bytes, 1);
|
|
ret = 0;
|
|
}
|
|
|
|
/*
|
|
* If we couldn't make a reservation then setup our reservation ticket
|
|
* and kick the async worker if it's not already running.
|
|
*
|
|
* If we are a priority flusher then we just need to add our ticket to
|
|
* the list and we will do our own flushing further down.
|
|
*/
|
|
if (ret && flush != BTRFS_RESERVE_NO_FLUSH) {
|
|
ticket.orig_bytes = orig_bytes;
|
|
ticket.bytes = orig_bytes;
|
|
ticket.error = 0;
|
|
init_waitqueue_head(&ticket.wait);
|
|
if (flush == BTRFS_RESERVE_FLUSH_ALL) {
|
|
list_add_tail(&ticket.list, &space_info->tickets);
|
|
if (!space_info->flush) {
|
|
space_info->flush = 1;
|
|
trace_btrfs_trigger_flush(fs_info,
|
|
space_info->flags,
|
|
orig_bytes, flush,
|
|
"enospc");
|
|
queue_work(system_unbound_wq,
|
|
&fs_info->async_reclaim_work);
|
|
}
|
|
} else {
|
|
list_add_tail(&ticket.list,
|
|
&space_info->priority_tickets);
|
|
}
|
|
} else if (!ret && space_info->flags & BTRFS_BLOCK_GROUP_METADATA) {
|
|
used += orig_bytes;
|
|
/*
|
|
* We will do the space reservation dance during log replay,
|
|
* which means we won't have fs_info->fs_root set, so don't do
|
|
* the async reclaim as we will panic.
|
|
*/
|
|
if (!test_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags) &&
|
|
need_do_async_reclaim(fs_info, space_info,
|
|
used, system_chunk) &&
|
|
!work_busy(&fs_info->async_reclaim_work)) {
|
|
trace_btrfs_trigger_flush(fs_info, space_info->flags,
|
|
orig_bytes, flush, "preempt");
|
|
queue_work(system_unbound_wq,
|
|
&fs_info->async_reclaim_work);
|
|
}
|
|
}
|
|
spin_unlock(&space_info->lock);
|
|
if (!ret || flush == BTRFS_RESERVE_NO_FLUSH)
|
|
return ret;
|
|
|
|
if (flush == BTRFS_RESERVE_FLUSH_ALL)
|
|
return wait_reserve_ticket(fs_info, space_info, &ticket);
|
|
|
|
ret = 0;
|
|
priority_reclaim_metadata_space(fs_info, space_info, &ticket);
|
|
spin_lock(&space_info->lock);
|
|
if (ticket.bytes) {
|
|
if (ticket.bytes < orig_bytes)
|
|
reclaim_bytes = orig_bytes - ticket.bytes;
|
|
list_del_init(&ticket.list);
|
|
ret = -ENOSPC;
|
|
}
|
|
spin_unlock(&space_info->lock);
|
|
|
|
if (reclaim_bytes)
|
|
btrfs_space_info_add_old_bytes(fs_info, space_info,
|
|
reclaim_bytes);
|
|
ASSERT(list_empty(&ticket.list));
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* reserve_metadata_bytes - try to reserve bytes from the block_rsv's space
|
|
* @root - the root we're allocating for
|
|
* @block_rsv - the block_rsv we're allocating for
|
|
* @orig_bytes - the number of bytes we want
|
|
* @flush - whether or not we can flush to make our reservation
|
|
*
|
|
* This will reserve orig_bytes number of bytes from the space info associated
|
|
* with the block_rsv. If there is not enough space it will make an attempt to
|
|
* flush out space to make room. It will do this by flushing delalloc if
|
|
* possible or committing the transaction. If flush is 0 then no attempts to
|
|
* regain reservations will be made and this will fail if there is not enough
|
|
* space already.
|
|
*/
|
|
int btrfs_reserve_metadata_bytes(struct btrfs_root *root,
|
|
struct btrfs_block_rsv *block_rsv,
|
|
u64 orig_bytes,
|
|
enum btrfs_reserve_flush_enum flush)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
|
|
int ret;
|
|
bool system_chunk = (root == fs_info->chunk_root);
|
|
|
|
ret = __reserve_metadata_bytes(fs_info, block_rsv->space_info,
|
|
orig_bytes, flush, system_chunk);
|
|
if (ret == -ENOSPC &&
|
|
unlikely(root->orphan_cleanup_state == ORPHAN_CLEANUP_STARTED)) {
|
|
if (block_rsv != global_rsv &&
|
|
!btrfs_block_rsv_use_bytes(global_rsv, orig_bytes))
|
|
ret = 0;
|
|
}
|
|
if (ret == -ENOSPC) {
|
|
trace_btrfs_space_reservation(fs_info, "space_info:enospc",
|
|
block_rsv->space_info->flags,
|
|
orig_bytes, 1);
|
|
|
|
if (btrfs_test_opt(fs_info, ENOSPC_DEBUG))
|
|
btrfs_dump_space_info(fs_info, block_rsv->space_info,
|
|
orig_bytes, 0);
|
|
}
|
|
return ret;
|
|
}
|