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btrfs: remove inode number cache feature

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It's been deprecated since commit b547a88ea5 ("btrfs: start
deprecation of mount option inode_cache") which enumerates the reasons.

A filesystem that uses the feature (mount -o inode_cache) tracks the
inode numbers in bitmaps, that data stay on the filesystem after this
patch. The size is roughly 5MiB for 1M inodes [1], which is considered
small enough to be left there. Removal of the change can be implemented
in btrfs-progs if needed.

[1] https://lore.kernel.org/linux-btrfs/20201127145836.GZ6430@twin.jikos.cz/

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ update changelog ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2020-11-26 15:10:39 +02:00 • committed by David Sterba
parent abadc1fcd7
commit 5297199a8b
13 changed files with 6 additions and 809 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
fs/btrfs/Makefile
View file

@ -3,7 +3,7 @@
obj-$(CONFIG_BTRFS_FS) := btrfs.o obj-$(CONFIG_BTRFS_FS) := btrfs.o
btrfs-y += super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \ btrfs-y += super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \
file-item.o inode-item.o inode-map.o disk-io.o \ file-item.o inode-item.o disk-io.o \
transaction.o inode.o file.o tree-defrag.o \ transaction.o inode.o file.o tree-defrag.o \
extent_map.o sysfs.o struct-funcs.o xattr.o ordered-data.o \ extent_map.o sysfs.o struct-funcs.o xattr.o ordered-data.o \
extent_io.o volumes.o async-thread.o ioctl.o locking.o orphan.o \ extent_io.o volumes.o async-thread.o ioctl.o locking.o orphan.o \

15
fs/btrfs/ctree.h
View file

@ -1077,15 +1077,6 @@ struct btrfs_root {
spinlock_t accounting_lock; spinlock_t accounting_lock;
struct btrfs_block_rsv *block_rsv; struct btrfs_block_rsv *block_rsv;
/* free ino cache stuff */
struct btrfs_free_space_ctl *free_ino_ctl;
enum btrfs_caching_type ino_cache_state;
spinlock_t ino_cache_lock;
wait_queue_head_t ino_cache_wait;
struct btrfs_free_space_ctl *free_ino_pinned;
u64 ino_cache_progress;
struct inode *ino_cache_inode;
struct mutex log_mutex; struct mutex log_mutex;
wait_queue_head_t log_writer_wait; wait_queue_head_t log_writer_wait;
wait_queue_head_t log_commit_wait[2]; wait_queue_head_t log_commit_wait[2];
@ -1359,7 +1350,7 @@ static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
#define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14) #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
#define BTRFS_MOUNT_ENOSPC_DEBUG (1 << 15) #define BTRFS_MOUNT_ENOSPC_DEBUG (1 << 15)
#define BTRFS_MOUNT_AUTO_DEFRAG (1 << 16) #define BTRFS_MOUNT_AUTO_DEFRAG (1 << 16)
#define BTRFS_MOUNT_INODE_MAP_CACHE (1 << 17) /* bit 17 is free */
#define BTRFS_MOUNT_USEBACKUPROOT (1 << 18) #define BTRFS_MOUNT_USEBACKUPROOT (1 << 18)
#define BTRFS_MOUNT_SKIP_BALANCE (1 << 19) #define BTRFS_MOUNT_SKIP_BALANCE (1 << 19)
#define BTRFS_MOUNT_CHECK_INTEGRITY (1 << 20) #define BTRFS_MOUNT_CHECK_INTEGRITY (1 << 20)
@ -1406,9 +1397,7 @@ do { \
* transaction commit) * transaction commit)
*/ */
#define BTRFS_PENDING_SET_INODE_MAP_CACHE (0) #define BTRFS_PENDING_COMMIT (0)
#define BTRFS_PENDING_CLEAR_INODE_MAP_CACHE (1)
#define BTRFS_PENDING_COMMIT (2)
#define btrfs_test_pending(info, opt) \ #define btrfs_test_pending(info, opt) \
test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes) test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)

23
fs/btrfs/disk-io.c
View file

@ -29,7 +29,6 @@
#include "tree-log.h" #include "tree-log.h"
#include "free-space-cache.h" #include "free-space-cache.h"
#include "free-space-tree.h" #include "free-space-tree.h"
#include "inode-map.h"
#include "check-integrity.h" #include "check-integrity.h"
#include "rcu-string.h" #include "rcu-string.h"
#include "dev-replace.h" #include "dev-replace.h"
@ -1336,14 +1335,6 @@ static int btrfs_init_fs_root(struct btrfs_root *root, dev_t anon_dev)
int ret; int ret;
unsigned int nofs_flag; unsigned int nofs_flag;
root->free_ino_ctl = kzalloc(sizeof(*root->free_ino_ctl), GFP_NOFS);
root->free_ino_pinned = kzalloc(sizeof(*root->free_ino_pinned),
GFP_NOFS);
if (!root->free_ino_pinned || !root->free_ino_ctl) {
ret = -ENOMEM;
goto fail;
}
/* /*
* We might be called under a transaction (e.g. indirect backref * We might be called under a transaction (e.g. indirect backref
* resolution) which could deadlock if it triggers memory reclaim * resolution) which could deadlock if it triggers memory reclaim
@ -1360,10 +1351,6 @@ static int btrfs_init_fs_root(struct btrfs_root *root, dev_t anon_dev)
btrfs_check_and_init_root_item(&root->root_item); btrfs_check_and_init_root_item(&root->root_item);
} }
btrfs_init_free_ino_ctl(root);
spin_lock_init(&root->ino_cache_lock);
init_waitqueue_head(&root->ino_cache_wait);
/* /*
* Don't assign anonymous block device to roots that are not exposed to * Don't assign anonymous block device to roots that are not exposed to
* userspace, the id pool is limited to 1M * userspace, the id pool is limited to 1M
@ -2033,8 +2020,6 @@ void btrfs_put_root(struct btrfs_root *root)
free_anon_bdev(root->anon_dev); free_anon_bdev(root->anon_dev);
btrfs_drew_lock_destroy(&root->snapshot_lock); btrfs_drew_lock_destroy(&root->snapshot_lock);
free_root_extent_buffers(root); free_root_extent_buffers(root);
kfree(root->free_ino_ctl);
kfree(root->free_ino_pinned);
#ifdef CONFIG_BTRFS_DEBUG #ifdef CONFIG_BTRFS_DEBUG
spin_lock(&root->fs_info->fs_roots_radix_lock); spin_lock(&root->fs_info->fs_roots_radix_lock);
list_del_init(&root->leak_list); list_del_init(&root->leak_list);
@ -3988,14 +3973,6 @@ void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
} }
} }
if (root->free_ino_pinned)
__btrfs_remove_free_space_cache(root->free_ino_pinned);
if (root->free_ino_ctl)
__btrfs_remove_free_space_cache(root->free_ino_ctl);
if (root->ino_cache_inode) {
iput(root->ino_cache_inode);
root->ino_cache_inode = NULL;
}
if (drop_ref) if (drop_ref)
btrfs_put_root(root); btrfs_put_root(root);
} }

177
fs/btrfs/free-space-cache.c
View file

@ -16,7 +16,6 @@
#include "transaction.h" #include "transaction.h"
#include "disk-io.h" #include "disk-io.h"
#include "extent_io.h" #include "extent_io.h"
#include "inode-map.h"
#include "volumes.h" #include "volumes.h"
#include "space-info.h" #include "space-info.h"
#include "delalloc-space.h" #include "delalloc-space.h"
@ -37,10 +36,6 @@ static int link_free_space(struct btrfs_free_space_ctl *ctl,
struct btrfs_free_space *info); struct btrfs_free_space *info);
static void unlink_free_space(struct btrfs_free_space_ctl *ctl, static void unlink_free_space(struct btrfs_free_space_ctl *ctl,
struct btrfs_free_space *info); struct btrfs_free_space *info);
static int btrfs_wait_cache_io_root(struct btrfs_root *root,
struct btrfs_trans_handle *trans,
struct btrfs_io_ctl *io_ctl,
struct btrfs_path *path);
static int search_bitmap(struct btrfs_free_space_ctl *ctl, static int search_bitmap(struct btrfs_free_space_ctl *ctl,
struct btrfs_free_space *bitmap_info, u64 *offset, struct btrfs_free_space *bitmap_info, u64 *offset,
u64 *bytes, bool for_alloc); u64 *bytes, bool for_alloc);
@ -1222,14 +1217,6 @@ out:
} }
static int btrfs_wait_cache_io_root(struct btrfs_root *root,
struct btrfs_trans_handle *trans,
struct btrfs_io_ctl *io_ctl,
struct btrfs_path *path)
{
return __btrfs_wait_cache_io(root, trans, NULL, io_ctl, path, 0);
}
int btrfs_wait_cache_io(struct btrfs_trans_handle *trans, int btrfs_wait_cache_io(struct btrfs_trans_handle *trans,
struct btrfs_block_group *block_group, struct btrfs_block_group *block_group,
struct btrfs_path *path) struct btrfs_path *path)
@ -3807,170 +3794,6 @@ int btrfs_trim_block_group_bitmaps(struct btrfs_block_group *block_group,
return ret; return ret;
} }
/*
* Find the left-most item in the cache tree, and then return the
* smallest inode number in the item.
*
* Note: the returned inode number may not be the smallest one in
* the tree, if the left-most item is a bitmap.
*/
u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root)
{
struct btrfs_free_space_ctl *ctl = fs_root->free_ino_ctl;
struct btrfs_free_space *entry = NULL;
u64 ino = 0;
spin_lock(&ctl->tree_lock);
if (RB_EMPTY_ROOT(&ctl->free_space_offset))
goto out;
entry = rb_entry(rb_first(&ctl->free_space_offset),
struct btrfs_free_space, offset_index);
if (!entry->bitmap) {
ino = entry->offset;
unlink_free_space(ctl, entry);
entry->offset++;
entry->bytes--;
if (!entry->bytes)
kmem_cache_free(btrfs_free_space_cachep, entry);
else
link_free_space(ctl, entry);
} else {
u64 offset = 0;
u64 count = 1;
int ret;
ret = search_bitmap(ctl, entry, &offset, &count, true);
/* Logic error; Should be empty if it can't find anything */
ASSERT(!ret);
ino = offset;
bitmap_clear_bits(ctl, entry, offset, 1);
if (entry->bytes == 0)
free_bitmap(ctl, entry);
}
out:
spin_unlock(&ctl->tree_lock);
return ino;
}
struct inode *lookup_free_ino_inode(struct btrfs_root *root,
struct btrfs_path *path)
{
struct inode *inode = NULL;
spin_lock(&root->ino_cache_lock);
if (root->ino_cache_inode)
inode = igrab(root->ino_cache_inode);
spin_unlock(&root->ino_cache_lock);
if (inode)
return inode;
inode = __lookup_free_space_inode(root, path, 0);
if (IS_ERR(inode))
return inode;
spin_lock(&root->ino_cache_lock);
if (!btrfs_fs_closing(root->fs_info))
root->ino_cache_inode = igrab(inode);
spin_unlock(&root->ino_cache_lock);
return inode;
}
int create_free_ino_inode(struct btrfs_root *root,
struct btrfs_trans_handle *trans,
struct btrfs_path *path)
{
return __create_free_space_inode(root, trans, path,
BTRFS_FREE_INO_OBJECTID, 0);
}
int load_free_ino_cache(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
{
struct btrfs_free_space_ctl *ctl = root->free_ino_ctl;
struct btrfs_path *path;
struct inode *inode;
int ret = 0;
u64 root_gen = btrfs_root_generation(&root->root_item);
if (!btrfs_test_opt(fs_info, INODE_MAP_CACHE))
return 0;
/*
* If we're unmounting then just return, since this does a search on the
* normal root and not the commit root and we could deadlock.
*/
if (btrfs_fs_closing(fs_info))
return 0;
path = btrfs_alloc_path();
if (!path)
return 0;
inode = lookup_free_ino_inode(root, path);
if (IS_ERR(inode))
goto out;
if (root_gen != BTRFS_I(inode)->generation)
goto out_put;
ret = __load_free_space_cache(root, inode, ctl, path, 0);
if (ret < 0)
btrfs_err(fs_info,
"failed to load free ino cache for root %llu",
root->root_key.objectid);
out_put:
iput(inode);
out:
btrfs_free_path(path);
return ret;
}
int btrfs_write_out_ino_cache(struct btrfs_root *root,
struct btrfs_trans_handle *trans,
struct btrfs_path *path,
struct inode *inode)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_free_space_ctl *ctl = root->free_ino_ctl;
int ret;
struct btrfs_io_ctl io_ctl;
bool release_metadata = true;
if (!btrfs_test_opt(fs_info, INODE_MAP_CACHE))
return 0;
memset(&io_ctl, 0, sizeof(io_ctl));
ret = __btrfs_write_out_cache(root, inode, ctl, NULL, &io_ctl, trans);
if (!ret) {
/*
* At this point writepages() didn't error out, so our metadata
* reservation is released when the writeback finishes, at
* inode.c:btrfs_finish_ordered_io(), regardless of it finishing
* with or without an error.
*/
release_metadata = false;
ret = btrfs_wait_cache_io_root(root, trans, &io_ctl, path);
}
if (ret) {
if (release_metadata)
btrfs_delalloc_release_metadata(BTRFS_I(inode),
inode->i_size, true);
btrfs_debug(fs_info,
"failed to write free ino cache for root %llu error %d",
root->root_key.objectid, ret);
}
return ret;
}
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
/* /*
* Use this if you need to make a bitmap or extent entry specifically, it * Use this if you need to make a bitmap or extent entry specifically, it

12
fs/btrfs/free-space-cache.h
View file

@ -97,17 +97,6 @@ int btrfs_wait_cache_io(struct btrfs_trans_handle *trans,
int btrfs_write_out_cache(struct btrfs_trans_handle *trans, int btrfs_write_out_cache(struct btrfs_trans_handle *trans,
struct btrfs_block_group *block_group, struct btrfs_block_group *block_group,
struct btrfs_path *path); struct btrfs_path *path);
struct inode *lookup_free_ino_inode(struct btrfs_root *root,
struct btrfs_path *path);
int create_free_ino_inode(struct btrfs_root *root,
struct btrfs_trans_handle *trans,
struct btrfs_path *path);
int load_free_ino_cache(struct btrfs_fs_info *fs_info,
struct btrfs_root *root);
int btrfs_write_out_ino_cache(struct btrfs_root *root,
struct btrfs_trans_handle *trans,
struct btrfs_path *path,
struct inode *inode);
void btrfs_init_free_space_ctl(struct btrfs_block_group *block_group, void btrfs_init_free_space_ctl(struct btrfs_block_group *block_group,
struct btrfs_free_space_ctl *ctl); struct btrfs_free_space_ctl *ctl);
@ -127,7 +116,6 @@ bool btrfs_is_free_space_trimmed(struct btrfs_block_group *block_group);
u64 btrfs_find_space_for_alloc(struct btrfs_block_group *block_group, u64 btrfs_find_space_for_alloc(struct btrfs_block_group *block_group,
u64 offset, u64 bytes, u64 empty_size, u64 offset, u64 bytes, u64 empty_size,
u64 *max_extent_size); u64 *max_extent_size);
u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root);
void btrfs_dump_free_space(struct btrfs_block_group *block_group, void btrfs_dump_free_space(struct btrfs_block_group *block_group,
u64 bytes); u64 bytes);
int btrfs_find_space_cluster(struct btrfs_block_group *block_group, int btrfs_find_space_cluster(struct btrfs_block_group *block_group,

527
fs/btrfs/inode-map.c
View file

@ -1,527 +0,0 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2007 Oracle. All rights reserved.
*/
#include <linux/kthread.h>
#include <linux/pagemap.h>
#include "ctree.h"
#include "disk-io.h"
#include "free-space-cache.h"
#include "inode-map.h"
#include "transaction.h"
#include "delalloc-space.h"
static void fail_caching_thread(struct btrfs_root *root)
{
struct btrfs_fs_info *fs_info = root->fs_info;
btrfs_warn(fs_info, "failed to start inode caching task");
btrfs_clear_pending_and_info(fs_info, INODE_MAP_CACHE,
"disabling inode map caching");
spin_lock(&root->ino_cache_lock);
root->ino_cache_state = BTRFS_CACHE_ERROR;
spin_unlock(&root->ino_cache_lock);
wake_up(&root->ino_cache_wait);
}
static int caching_kthread(void *data)
{
struct btrfs_root *root = data;
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_free_space_ctl *ctl = root->free_ino_ctl;
struct btrfs_key key;
struct btrfs_path *path;
struct extent_buffer *leaf;
u64 last = (u64)-1;
int slot;
int ret;
if (!btrfs_test_opt(fs_info, INODE_MAP_CACHE))
return 0;
path = btrfs_alloc_path();
if (!path) {
fail_caching_thread(root);
return -ENOMEM;
}
/* Since the commit root is read-only, we can safely skip locking. */
path->skip_locking = 1;
path->search_commit_root = 1;
path->reada = READA_FORWARD;
key.objectid = BTRFS_FIRST_FREE_OBJECTID;
key.offset = 0;
key.type = BTRFS_INODE_ITEM_KEY;
again:
/* need to make sure the commit_root doesn't disappear */
down_read(&fs_info->commit_root_sem);
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
goto out;
while (1) {
if (btrfs_fs_closing(fs_info))
goto out;
leaf = path->nodes[0];
slot = path->slots[0];
if (slot >= btrfs_header_nritems(leaf)) {
ret = btrfs_next_leaf(root, path);
if (ret < 0)
goto out;
else if (ret > 0)
break;
if (need_resched() ||
btrfs_transaction_in_commit(fs_info)) {
leaf = path->nodes[0];
if (WARN_ON(btrfs_header_nritems(leaf) == 0))
break;
/*
* Save the key so we can advances forward
* in the next search.
*/
btrfs_item_key_to_cpu(leaf, &key, 0);
btrfs_release_path(path);
root->ino_cache_progress = last;
up_read(&fs_info->commit_root_sem);
schedule_timeout(1);
goto again;
} else
continue;
}
btrfs_item_key_to_cpu(leaf, &key, slot);
if (key.type != BTRFS_INODE_ITEM_KEY)
goto next;
if (key.objectid >= root->highest_objectid)
break;
if (last != (u64)-1 && last + 1 != key.objectid) {
__btrfs_add_free_space(fs_info, ctl, last + 1,
key.objectid - last - 1, 0);
wake_up(&root->ino_cache_wait);
}
last = key.objectid;
next:
path->slots[0]++;
}
if (last < root->highest_objectid - 1) {
__btrfs_add_free_space(fs_info, ctl, last + 1,
root->highest_objectid - last - 1, 0);
}
spin_lock(&root->ino_cache_lock);
root->ino_cache_state = BTRFS_CACHE_FINISHED;
spin_unlock(&root->ino_cache_lock);
root->ino_cache_progress = (u64)-1;
btrfs_unpin_free_ino(root);
out:
wake_up(&root->ino_cache_wait);
up_read(&fs_info->commit_root_sem);
btrfs_free_path(path);
return ret;
}
static void start_caching(struct btrfs_root *root)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_free_space_ctl *ctl = root->free_ino_ctl;
struct task_struct *tsk;
int ret;
u64 objectid;
if (!btrfs_test_opt(fs_info, INODE_MAP_CACHE))
return;
spin_lock(&root->ino_cache_lock);
if (root->ino_cache_state != BTRFS_CACHE_NO) {
spin_unlock(&root->ino_cache_lock);
return;
}
root->ino_cache_state = BTRFS_CACHE_STARTED;
spin_unlock(&root->ino_cache_lock);
ret = load_free_ino_cache(fs_info, root);
if (ret == 1) {
spin_lock(&root->ino_cache_lock);
root->ino_cache_state = BTRFS_CACHE_FINISHED;
spin_unlock(&root->ino_cache_lock);
wake_up(&root->ino_cache_wait);
return;
}
/*
* It can be quite time-consuming to fill the cache by searching
* through the extent tree, and this can keep ino allocation path
* waiting. Therefore at start we quickly find out the highest
* inode number and we know we can use inode numbers which fall in
* [highest_ino + 1, BTRFS_LAST_FREE_OBJECTID].
*/
ret = btrfs_find_free_objectid(root, &objectid);
if (!ret && objectid <= BTRFS_LAST_FREE_OBJECTID) {
__btrfs_add_free_space(fs_info, ctl, objectid,
BTRFS_LAST_FREE_OBJECTID - objectid + 1,
0);
wake_up(&root->ino_cache_wait);
}
tsk = kthread_run(caching_kthread, root, "btrfs-ino-cache-%llu",
root->root_key.objectid);
if (IS_ERR(tsk))
fail_caching_thread(root);
}
int btrfs_find_free_ino(struct btrfs_root *root, u64 *objectid)
{
if (!btrfs_test_opt(root->fs_info, INODE_MAP_CACHE))
return btrfs_find_free_objectid(root, objectid);
again:
*objectid = btrfs_find_ino_for_alloc(root);
if (*objectid != 0)
return 0;
start_caching(root);
wait_event(root->ino_cache_wait,
root->ino_cache_state == BTRFS_CACHE_FINISHED ||
root->ino_cache_state == BTRFS_CACHE_ERROR ||
root->free_ino_ctl->free_space > 0);
if (root->ino_cache_state == BTRFS_CACHE_FINISHED &&
root->free_ino_ctl->free_space == 0)
return -ENOSPC;
else if (root->ino_cache_state == BTRFS_CACHE_ERROR)
return btrfs_find_free_objectid(root, objectid);
else
goto again;
}
void btrfs_return_ino(struct btrfs_root *root, u64 objectid)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_free_space_ctl *pinned = root->free_ino_pinned;
if (!btrfs_test_opt(fs_info, INODE_MAP_CACHE))
return;
again:
if (root->ino_cache_state == BTRFS_CACHE_FINISHED) {
__btrfs_add_free_space(fs_info, pinned, objectid, 1, 0);
} else {
down_write(&fs_info->commit_root_sem);
spin_lock(&root->ino_cache_lock);
if (root->ino_cache_state == BTRFS_CACHE_FINISHED) {
spin_unlock(&root->ino_cache_lock);
up_write(&fs_info->commit_root_sem);
goto again;
}
spin_unlock(&root->ino_cache_lock);
start_caching(root);
__btrfs_add_free_space(fs_info, pinned, objectid, 1, 0);
up_write(&fs_info->commit_root_sem);
}
}
/*
* When a transaction is committed, we'll move those inode numbers which are
* smaller than root->ino_cache_progress from pinned tree to free_ino tree, and
* others will just be dropped, because the commit root we were searching has
* changed.
*
* Must be called with root->fs_info->commit_root_sem held
*/
void btrfs_unpin_free_ino(struct btrfs_root *root)
{
struct btrfs_free_space_ctl *ctl = root->free_ino_ctl;
struct rb_root *rbroot = &root->free_ino_pinned->free_space_offset;
spinlock_t *rbroot_lock = &root->free_ino_pinned->tree_lock;
struct btrfs_free_space *info;
struct rb_node *n;
u64 count;
if (!btrfs_test_opt(root->fs_info, INODE_MAP_CACHE))
return;
while (1) {
spin_lock(rbroot_lock);
n = rb_first(rbroot);
if (!n) {
spin_unlock(rbroot_lock);
break;
}
info = rb_entry(n, struct btrfs_free_space, offset_index);
BUG_ON(info->bitmap); /* Logic error */
if (info->offset > root->ino_cache_progress)
count = 0;
else
count = min(root->ino_cache_progress - info->offset + 1,
info->bytes);
rb_erase(&info->offset_index, rbroot);
spin_unlock(rbroot_lock);
if (count)
__btrfs_add_free_space(root->fs_info, ctl,
info->offset, count, 0);
kmem_cache_free(btrfs_free_space_cachep, info);
}
}
#define INIT_THRESHOLD ((SZ_32K / 2) / sizeof(struct btrfs_free_space))
#define INODES_PER_BITMAP (PAGE_SIZE * 8)
/*
* The goal is to keep the memory used by the free_ino tree won't
* exceed the memory if we use bitmaps only.
*/
static void recalculate_thresholds(struct btrfs_free_space_ctl *ctl)
{
struct btrfs_free_space *info;
struct rb_node *n;
int max_ino;
int max_bitmaps;
n = rb_last(&ctl->free_space_offset);
if (!n) {
ctl->extents_thresh = INIT_THRESHOLD;
return;
}
info = rb_entry(n, struct btrfs_free_space, offset_index);
/*
* Find the maximum inode number in the filesystem. Note we
* ignore the fact that this can be a bitmap, because we are
* not doing precise calculation.
*/
max_ino = info->bytes - 1;
max_bitmaps = ALIGN(max_ino, INODES_PER_BITMAP) / INODES_PER_BITMAP;
if (max_bitmaps <= ctl->total_bitmaps) {
ctl->extents_thresh = 0;
return;
}
ctl->extents_thresh = (max_bitmaps - ctl->total_bitmaps) *
PAGE_SIZE / sizeof(*info);
}
/*
* We don't fall back to bitmap, if we are below the extents threshold
* or this chunk of inode numbers is a big one.
*/
static bool use_bitmap(struct btrfs_free_space_ctl *ctl,
struct btrfs_free_space *info)
{
if (ctl->free_extents < ctl->extents_thresh ||
info->bytes > INODES_PER_BITMAP / 10)
return false;
return true;
}
static const struct btrfs_free_space_op free_ino_op = {
.recalc_thresholds = recalculate_thresholds,
.use_bitmap = use_bitmap,
};
static void pinned_recalc_thresholds(struct btrfs_free_space_ctl *ctl)
{
}
static bool pinned_use_bitmap(struct btrfs_free_space_ctl *ctl,
struct btrfs_free_space *info)
{
/*
* We always use extents for two reasons:
*
* - The pinned tree is only used during the process of caching
* work.
* - Make code simpler. See btrfs_unpin_free_ino().
*/
return false;
}
static const struct btrfs_free_space_op pinned_free_ino_op = {
.recalc_thresholds = pinned_recalc_thresholds,
.use_bitmap = pinned_use_bitmap,
};
void btrfs_init_free_ino_ctl(struct btrfs_root *root)
{
struct btrfs_free_space_ctl *ctl = root->free_ino_ctl;
struct btrfs_free_space_ctl *pinned = root->free_ino_pinned;
spin_lock_init(&ctl->tree_lock);
ctl->unit = 1;
ctl->start = 0;
ctl->private = NULL;
ctl->op = &free_ino_op;
INIT_LIST_HEAD(&ctl->trimming_ranges);
mutex_init(&ctl->cache_writeout_mutex);
/*
* Initially we allow to use 16K of ram to cache chunks of
* inode numbers before we resort to bitmaps. This is somewhat
* arbitrary, but it will be adjusted in runtime.
*/
ctl->extents_thresh = INIT_THRESHOLD;
spin_lock_init(&pinned->tree_lock);
pinned->unit = 1;
pinned->start = 0;
pinned->private = NULL;
pinned->extents_thresh = 0;
pinned->op = &pinned_free_ino_op;
}
int btrfs_save_ino_cache(struct btrfs_root *root,
struct btrfs_trans_handle *trans)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_free_space_ctl *ctl = root->free_ino_ctl;
struct btrfs_path *path;
struct inode *inode;
struct btrfs_block_rsv *rsv;
struct extent_changeset *data_reserved = NULL;
u64 num_bytes;
u64 alloc_hint = 0;
int ret;
int prealloc;
bool retry = false;
/* only fs tree and subvol/snap needs ino cache */
if (root->root_key.objectid != BTRFS_FS_TREE_OBJECTID &&
(root->root_key.objectid < BTRFS_FIRST_FREE_OBJECTID ||
root->root_key.objectid > BTRFS_LAST_FREE_OBJECTID))
return 0;
/* Don't save inode cache if we are deleting this root */
if (btrfs_root_refs(&root->root_item) == 0)
return 0;
if (!btrfs_test_opt(fs_info, INODE_MAP_CACHE))
return 0;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
rsv = trans->block_rsv;
trans->block_rsv = &fs_info->trans_block_rsv;
num_bytes = trans->bytes_reserved;
/*
* 1 item for inode item insertion if need
* 4 items for inode item update (in the worst case)
* 1 items for slack space if we need do truncation
* 1 item for free space object
* 3 items for pre-allocation
*/
trans->bytes_reserved = btrfs_calc_insert_metadata_size(fs_info, 10);
ret = btrfs_block_rsv_add(root, trans->block_rsv,
trans->bytes_reserved,
BTRFS_RESERVE_NO_FLUSH);
if (ret)
goto out;
trace_btrfs_space_reservation(fs_info, "ino_cache", trans->transid,
trans->bytes_reserved, 1);
again:
inode = lookup_free_ino_inode(root, path);
if (IS_ERR(inode) && (PTR_ERR(inode) != -ENOENT || retry)) {
ret = PTR_ERR(inode);
goto out_release;
}
if (IS_ERR(inode)) {
BUG_ON(retry); /* Logic error */
retry = true;
ret = create_free_ino_inode(root, trans, path);
if (ret)
goto out_release;
goto again;
}
BTRFS_I(inode)->generation = 0;
ret = btrfs_update_inode(trans, root, BTRFS_I(inode));
if (ret) {
btrfs_abort_transaction(trans, ret);
goto out_put;
}
if (i_size_read(inode) > 0) {
ret = btrfs_truncate_free_space_cache(trans, NULL, inode);
if (ret) {
if (ret != -ENOSPC)
btrfs_abort_transaction(trans, ret);
goto out_put;
}
}
spin_lock(&root->ino_cache_lock);
if (root->ino_cache_state != BTRFS_CACHE_FINISHED) {
ret = -1;
spin_unlock(&root->ino_cache_lock);
goto out_put;
}
spin_unlock(&root->ino_cache_lock);
spin_lock(&ctl->tree_lock);
prealloc = sizeof(struct btrfs_free_space) * ctl->free_extents;
prealloc = ALIGN(prealloc, PAGE_SIZE);
prealloc += ctl->total_bitmaps * PAGE_SIZE;
spin_unlock(&ctl->tree_lock);
/* Just to make sure we have enough space */
prealloc += 8 * PAGE_SIZE;
ret = btrfs_delalloc_reserve_space(BTRFS_I(inode), &data_reserved, 0,
prealloc);
if (ret)
goto out_put;
ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, prealloc,
prealloc, prealloc, &alloc_hint);
if (ret) {
btrfs_delalloc_release_extents(BTRFS_I(inode), prealloc);
btrfs_delalloc_release_metadata(BTRFS_I(inode), prealloc, true);
goto out_put;
}
ret = btrfs_write_out_ino_cache(root, trans, path, inode);
btrfs_delalloc_release_extents(BTRFS_I(inode), prealloc);
out_put:
iput(inode);
out_release:
trace_btrfs_space_reservation(fs_info, "ino_cache", trans->transid,
trans->bytes_reserved, 0);
btrfs_block_rsv_release(fs_info, trans->block_rsv,
trans->bytes_reserved, NULL);
out:
trans->block_rsv = rsv;
trans->bytes_reserved = num_bytes;
btrfs_free_path(path);
extent_changeset_free(data_reserved);
return ret;
}

13
fs/btrfs/inode-map.h
View file

@ -1,13 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef BTRFS_INODE_MAP_H
#define BTRFS_INODE_MAP_H
void btrfs_init_free_ino_ctl(struct btrfs_root *root);
void btrfs_unpin_free_ino(struct btrfs_root *root);
void btrfs_return_ino(struct btrfs_root *root, u64 objectid);
int btrfs_find_free_ino(struct btrfs_root *root, u64 *objectid);
int btrfs_save_ino_cache(struct btrfs_root *root,
struct btrfs_trans_handle *trans);
#endif

11
fs/btrfs/inode.c
View file

@ -45,7 +45,6 @@
#include "compression.h" #include "compression.h"
#include "locking.h" #include "locking.h"
#include "free-space-cache.h" #include "free-space-cache.h"
#include "inode-map.h"
#include "props.h" #include "props.h"
#include "qgroup.h" #include "qgroup.h"
#include "delalloc-space.h" #include "delalloc-space.h"
@ -4214,12 +4213,6 @@ out_up_write:
d_invalidate(dentry); d_invalidate(dentry);
btrfs_prune_dentries(dest); btrfs_prune_dentries(dest);
ASSERT(dest->send_in_progress == 0); ASSERT(dest->send_in_progress == 0);
/* the last ref */
if (dest->ino_cache_inode) {
iput(dest->ino_cache_inode);
dest->ino_cache_inode = NULL;
}
} }
return ret; return ret;
@ -5295,10 +5288,6 @@ void btrfs_evict_inode(struct inode *inode)
btrfs_end_transaction(trans); btrfs_end_transaction(trans);
} }
if (!(root == fs_info->tree_root ||
root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID))
btrfs_return_ino(root, btrfs_ino(BTRFS_I(inode)));
free_rsv: free_rsv:
btrfs_free_block_rsv(fs_info, rsv); btrfs_free_block_rsv(fs_info, rsv);
no_delete: no_delete:

1
fs/btrfs/ioctl.c
View file

@ -34,7 +34,6 @@
#include "print-tree.h" #include "print-tree.h"
#include "volumes.h" #include "volumes.h"
#include "locking.h" #include "locking.h"
#include "inode-map.h"
#include "backref.h" #include "backref.h"
#include "rcu-string.h" #include "rcu-string.h"
#include "send.h" #include "send.h"

1
fs/btrfs/relocation.c
View file

@ -18,7 +18,6 @@
#include "btrfs_inode.h" #include "btrfs_inode.h"
#include "async-thread.h" #include "async-thread.h"
#include "free-space-cache.h" #include "free-space-cache.h"
#include "inode-map.h"
#include "qgroup.h" #include "qgroup.h"
#include "print-tree.h" #include "print-tree.h"
#include "delalloc-space.h" #include "delalloc-space.h"

13
fs/btrfs/super.c
View file

@ -338,7 +338,6 @@ enum {
Opt_device, Opt_device,
Opt_fatal_errors, Opt_fatal_errors,
Opt_flushoncommit, Opt_noflushoncommit, Opt_flushoncommit, Opt_noflushoncommit,
Opt_inode_cache, Opt_noinode_cache,
Opt_max_inline, Opt_max_inline,
Opt_barrier, Opt_nobarrier, Opt_barrier, Opt_nobarrier,
Opt_datacow, Opt_nodatacow, Opt_datacow, Opt_nodatacow,
@ -371,6 +370,7 @@ enum {
/* Deprecated options */ /* Deprecated options */
Opt_recovery, Opt_recovery,
Opt_inode_cache, Opt_noinode_cache,
/* Debugging options */ /* Debugging options */
Opt_check_integrity, Opt_check_integrity,
@ -880,14 +880,9 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
} }
break; break;
case Opt_inode_cache: case Opt_inode_cache:
btrfs_warn(info,
"the 'inode_cache' option is deprecated and will have no effect from 5.11");
btrfs_set_pending_and_info(info, INODE_MAP_CACHE,
"enabling inode map caching");
break;
case Opt_noinode_cache: case Opt_noinode_cache:
btrfs_clear_pending_and_info(info, INODE_MAP_CACHE, btrfs_warn(info,
"disabling inode map caching"); "the 'inode_cache' option is deprecated and has no effect since 5.11");
break; break;
case Opt_clear_cache: case Opt_clear_cache:
btrfs_set_and_info(info, CLEAR_CACHE, btrfs_set_and_info(info, CLEAR_CACHE,
@ -1506,8 +1501,6 @@ static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
seq_puts(seq, ",enospc_debug"); seq_puts(seq, ",enospc_debug");
if (btrfs_test_opt(info, AUTO_DEFRAG)) if (btrfs_test_opt(info, AUTO_DEFRAG))
seq_puts(seq, ",autodefrag"); seq_puts(seq, ",autodefrag");
if (btrfs_test_opt(info, INODE_MAP_CACHE))
seq_puts(seq, ",inode_cache");
if (btrfs_test_opt(info, SKIP_BALANCE)) if (btrfs_test_opt(info, SKIP_BALANCE))
seq_puts(seq, ",skip_balance"); seq_puts(seq, ",skip_balance");
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY

19
fs/btrfs/transaction.c
View file

@ -16,7 +16,6 @@
#include "transaction.h" #include "transaction.h"
#include "locking.h" #include "locking.h"
#include "tree-log.h" #include "tree-log.h"
#include "inode-map.h"
#include "volumes.h" #include "volumes.h"
#include "dev-replace.h" #include "dev-replace.h"
#include "qgroup.h" #include "qgroup.h"
@ -163,8 +162,6 @@ static noinline void switch_commit_roots(struct btrfs_trans_handle *trans)
list_del_init(&root->dirty_list); list_del_init(&root->dirty_list);
free_extent_buffer(root->commit_root); free_extent_buffer(root->commit_root);
root->commit_root = btrfs_root_node(root); root->commit_root = btrfs_root_node(root);
if (is_fstree(root->root_key.objectid))
btrfs_unpin_free_ino(root);
extent_io_tree_release(&root->dirty_log_pages); extent_io_tree_release(&root->dirty_log_pages);
btrfs_qgroup_clean_swapped_blocks(root); btrfs_qgroup_clean_swapped_blocks(root);
} }
@ -1342,8 +1339,6 @@ static noinline int commit_fs_roots(struct btrfs_trans_handle *trans)
btrfs_free_log(trans, root); btrfs_free_log(trans, root);
btrfs_update_reloc_root(trans, root); btrfs_update_reloc_root(trans, root);
btrfs_save_ino_cache(root, trans);
/* see comments in should_cow_block() */ /* see comments in should_cow_block() */
clear_bit(BTRFS_ROOT_FORCE_COW, &root->state); clear_bit(BTRFS_ROOT_FORCE_COW, &root->state);
smp_mb__after_atomic(); smp_mb__after_atomic();
@ -2436,10 +2431,6 @@ int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root)
btrfs_debug(fs_info, "cleaner removing %llu", root->root_key.objectid); btrfs_debug(fs_info, "cleaner removing %llu", root->root_key.objectid);
btrfs_kill_all_delayed_nodes(root); btrfs_kill_all_delayed_nodes(root);
if (root->ino_cache_inode) {
iput(root->ino_cache_inode);
root->ino_cache_inode = NULL;
}
if (btrfs_header_backref_rev(root->node) < if (btrfs_header_backref_rev(root->node) <
BTRFS_MIXED_BACKREF_REV) BTRFS_MIXED_BACKREF_REV)
@ -2460,16 +2451,6 @@ void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info)
if (!prev) if (!prev)
return; return;
bit = 1 << BTRFS_PENDING_SET_INODE_MAP_CACHE;
if (prev & bit)
btrfs_set_opt(fs_info->mount_opt, INODE_MAP_CACHE);
prev &= ~bit;
bit = 1 << BTRFS_PENDING_CLEAR_INODE_MAP_CACHE;
if (prev & bit)
btrfs_clear_opt(fs_info->mount_opt, INODE_MAP_CACHE);
prev &= ~bit;
bit = 1 << BTRFS_PENDING_COMMIT; bit = 1 << BTRFS_PENDING_COMMIT;
if (prev & bit) if (prev & bit)
btrfs_debug(fs_info, "pending commit done"); btrfs_debug(fs_info, "pending commit done");

1
fs/btrfs/tree-log.c
View file

@ -17,7 +17,6 @@
#include "backref.h" #include "backref.h"
#include "compression.h" #include "compression.h"
#include "qgroup.h" #include "qgroup.h"
#include "inode-map.h"
#include "block-group.h" #include "block-group.h"
#include "space-info.h" #include "space-info.h"