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58a774ca16
Remove duplicate included header file linux/blkdev.h . Signed-off-by: Thorsten Blum <thorsten.blum@toblux.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
1079 lines
31 KiB
C
1079 lines
31 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef BTRFS_FS_H
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#define BTRFS_FS_H
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#include <linux/blkdev.h>
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#include <linux/sizes.h>
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#include <linux/time64.h>
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#include <linux/compiler.h>
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#include <linux/math.h>
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#include <linux/atomic.h>
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#include <linux/percpu_counter.h>
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#include <linux/completion.h>
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#include <linux/lockdep.h>
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#include <linux/spinlock.h>
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#include <linux/mutex.h>
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#include <linux/rwlock_types.h>
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#include <linux/rwsem.h>
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#include <linux/semaphore.h>
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#include <linux/list.h>
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#include <linux/radix-tree.h>
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#include <linux/workqueue.h>
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#include <linux/wait.h>
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#include <linux/wait_bit.h>
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#include <linux/sched.h>
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#include <linux/rbtree.h>
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#include <uapi/linux/btrfs.h>
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#include <uapi/linux/btrfs_tree.h>
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#include "extent-io-tree.h"
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#include "async-thread.h"
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#include "block-rsv.h"
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#include "fs.h"
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struct inode;
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struct super_block;
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struct kobject;
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struct reloc_control;
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struct crypto_shash;
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struct ulist;
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struct btrfs_device;
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struct btrfs_block_group;
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struct btrfs_root;
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struct btrfs_fs_devices;
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struct btrfs_transaction;
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struct btrfs_delayed_root;
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struct btrfs_balance_control;
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struct btrfs_subpage_info;
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struct btrfs_stripe_hash_table;
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struct btrfs_space_info;
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#define BTRFS_MAX_EXTENT_SIZE SZ_128M
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#define BTRFS_OLDEST_GENERATION 0ULL
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#define BTRFS_EMPTY_DIR_SIZE 0
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#define BTRFS_DIRTY_METADATA_THRESH SZ_32M
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#define BTRFS_SUPER_INFO_OFFSET SZ_64K
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#define BTRFS_SUPER_INFO_SIZE 4096
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static_assert(sizeof(struct btrfs_super_block) == BTRFS_SUPER_INFO_SIZE);
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/*
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* Number of metadata items necessary for an unlink operation:
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*
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* 1 for the possible orphan item
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* 1 for the dir item
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* 1 for the dir index
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* 1 for the inode ref
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* 1 for the inode
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* 1 for the parent inode
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*/
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#define BTRFS_UNLINK_METADATA_UNITS 6
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/*
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* The reserved space at the beginning of each device. It covers the primary
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* super block and leaves space for potential use by other tools like
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* bootloaders or to lower potential damage of accidental overwrite.
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*/
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#define BTRFS_DEVICE_RANGE_RESERVED (SZ_1M)
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/*
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* Runtime (in-memory) states of filesystem
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*/
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enum {
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/*
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* Filesystem is being remounted, allow to skip some operations, like
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* defrag
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*/
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BTRFS_FS_STATE_REMOUNTING,
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/* Filesystem in RO mode */
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BTRFS_FS_STATE_RO,
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/* Track if a transaction abort has been reported on this filesystem */
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BTRFS_FS_STATE_TRANS_ABORTED,
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/*
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* Bio operations should be blocked on this filesystem because a source
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* or target device is being destroyed as part of a device replace
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*/
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BTRFS_FS_STATE_DEV_REPLACING,
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/* The btrfs_fs_info created for self-tests */
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BTRFS_FS_STATE_DUMMY_FS_INFO,
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BTRFS_FS_STATE_NO_CSUMS,
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/* Indicates there was an error cleaning up a log tree. */
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BTRFS_FS_STATE_LOG_CLEANUP_ERROR,
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BTRFS_FS_STATE_COUNT
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};
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enum {
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BTRFS_FS_CLOSING_START,
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BTRFS_FS_CLOSING_DONE,
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BTRFS_FS_LOG_RECOVERING,
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BTRFS_FS_OPEN,
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BTRFS_FS_QUOTA_ENABLED,
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BTRFS_FS_UPDATE_UUID_TREE_GEN,
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BTRFS_FS_CREATING_FREE_SPACE_TREE,
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BTRFS_FS_BTREE_ERR,
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BTRFS_FS_LOG1_ERR,
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BTRFS_FS_LOG2_ERR,
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BTRFS_FS_QUOTA_OVERRIDE,
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/* Used to record internally whether fs has been frozen */
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BTRFS_FS_FROZEN,
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/*
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* Indicate that balance has been set up from the ioctl and is in the
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* main phase. The fs_info::balance_ctl is initialized.
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*/
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BTRFS_FS_BALANCE_RUNNING,
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/*
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* Indicate that relocation of a chunk has started, it's set per chunk
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* and is toggled between chunks.
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*/
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BTRFS_FS_RELOC_RUNNING,
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/* Indicate that the cleaner thread is awake and doing something. */
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BTRFS_FS_CLEANER_RUNNING,
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/*
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* The checksumming has an optimized version and is considered fast,
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* so we don't need to offload checksums to workqueues.
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*/
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BTRFS_FS_CSUM_IMPL_FAST,
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/* Indicate that the discard workqueue can service discards. */
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BTRFS_FS_DISCARD_RUNNING,
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/* Indicate that we need to cleanup space cache v1 */
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BTRFS_FS_CLEANUP_SPACE_CACHE_V1,
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/* Indicate that we can't trust the free space tree for caching yet */
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BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED,
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/* Indicate whether there are any tree modification log users */
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BTRFS_FS_TREE_MOD_LOG_USERS,
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/* Indicate that we want the transaction kthread to commit right now. */
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BTRFS_FS_COMMIT_TRANS,
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/* Indicate we have half completed snapshot deletions pending. */
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BTRFS_FS_UNFINISHED_DROPS,
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/* Indicate we have to finish a zone to do next allocation. */
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BTRFS_FS_NEED_ZONE_FINISH,
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/* Indicate that we want to commit the transaction. */
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BTRFS_FS_NEED_TRANS_COMMIT,
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/* This is set when active zone tracking is needed. */
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BTRFS_FS_ACTIVE_ZONE_TRACKING,
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/*
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* Indicate if we have some features changed, this is mostly for
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* cleaner thread to update the sysfs interface.
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*/
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BTRFS_FS_FEATURE_CHANGED,
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/*
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* Indicate that we have found a tree block which is only aligned to
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* sectorsize, but not to nodesize. This should be rare nowadays.
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*/
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BTRFS_FS_UNALIGNED_TREE_BLOCK,
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#if BITS_PER_LONG == 32
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/* Indicate if we have error/warn message printed on 32bit systems */
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BTRFS_FS_32BIT_ERROR,
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BTRFS_FS_32BIT_WARN,
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#endif
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};
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/*
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* Flags for mount options.
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*
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* Note: don't forget to add new options to btrfs_show_options()
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*/
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enum {
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BTRFS_MOUNT_NODATASUM = (1UL << 0),
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BTRFS_MOUNT_NODATACOW = (1UL << 1),
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BTRFS_MOUNT_NOBARRIER = (1UL << 2),
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BTRFS_MOUNT_SSD = (1UL << 3),
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BTRFS_MOUNT_DEGRADED = (1UL << 4),
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BTRFS_MOUNT_COMPRESS = (1UL << 5),
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BTRFS_MOUNT_NOTREELOG = (1UL << 6),
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BTRFS_MOUNT_FLUSHONCOMMIT = (1UL << 7),
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BTRFS_MOUNT_SSD_SPREAD = (1UL << 8),
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BTRFS_MOUNT_NOSSD = (1UL << 9),
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BTRFS_MOUNT_DISCARD_SYNC = (1UL << 10),
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BTRFS_MOUNT_FORCE_COMPRESS = (1UL << 11),
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BTRFS_MOUNT_SPACE_CACHE = (1UL << 12),
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BTRFS_MOUNT_CLEAR_CACHE = (1UL << 13),
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BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED = (1UL << 14),
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BTRFS_MOUNT_ENOSPC_DEBUG = (1UL << 15),
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BTRFS_MOUNT_AUTO_DEFRAG = (1UL << 16),
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BTRFS_MOUNT_USEBACKUPROOT = (1UL << 17),
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BTRFS_MOUNT_SKIP_BALANCE = (1UL << 18),
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BTRFS_MOUNT_PANIC_ON_FATAL_ERROR = (1UL << 19),
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BTRFS_MOUNT_RESCAN_UUID_TREE = (1UL << 20),
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BTRFS_MOUNT_FRAGMENT_DATA = (1UL << 21),
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BTRFS_MOUNT_FRAGMENT_METADATA = (1UL << 22),
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BTRFS_MOUNT_FREE_SPACE_TREE = (1UL << 23),
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BTRFS_MOUNT_NOLOGREPLAY = (1UL << 24),
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BTRFS_MOUNT_REF_VERIFY = (1UL << 25),
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BTRFS_MOUNT_DISCARD_ASYNC = (1UL << 26),
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BTRFS_MOUNT_IGNOREBADROOTS = (1UL << 27),
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BTRFS_MOUNT_IGNOREDATACSUMS = (1UL << 28),
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BTRFS_MOUNT_NODISCARD = (1UL << 29),
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BTRFS_MOUNT_NOSPACECACHE = (1UL << 30),
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};
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/*
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* Compat flags that we support. If any incompat flags are set other than the
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* ones specified below then we will fail to mount
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*/
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#define BTRFS_FEATURE_COMPAT_SUPP 0ULL
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#define BTRFS_FEATURE_COMPAT_SAFE_SET 0ULL
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#define BTRFS_FEATURE_COMPAT_SAFE_CLEAR 0ULL
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#define BTRFS_FEATURE_COMPAT_RO_SUPP \
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(BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE | \
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BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID | \
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BTRFS_FEATURE_COMPAT_RO_VERITY | \
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BTRFS_FEATURE_COMPAT_RO_BLOCK_GROUP_TREE)
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#define BTRFS_FEATURE_COMPAT_RO_SAFE_SET 0ULL
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#define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR 0ULL
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#define BTRFS_FEATURE_INCOMPAT_SUPP_STABLE \
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(BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
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BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
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BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
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BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
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BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
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BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD | \
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BTRFS_FEATURE_INCOMPAT_RAID56 | \
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BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \
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BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \
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BTRFS_FEATURE_INCOMPAT_NO_HOLES | \
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BTRFS_FEATURE_INCOMPAT_METADATA_UUID | \
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BTRFS_FEATURE_INCOMPAT_RAID1C34 | \
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BTRFS_FEATURE_INCOMPAT_ZONED | \
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BTRFS_FEATURE_INCOMPAT_SIMPLE_QUOTA)
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#ifdef CONFIG_BTRFS_DEBUG
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/*
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* Features under developmen like Extent tree v2 support is enabled
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* only under CONFIG_BTRFS_DEBUG.
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*/
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#define BTRFS_FEATURE_INCOMPAT_SUPP \
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(BTRFS_FEATURE_INCOMPAT_SUPP_STABLE | \
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BTRFS_FEATURE_INCOMPAT_RAID_STRIPE_TREE | \
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BTRFS_FEATURE_INCOMPAT_EXTENT_TREE_V2)
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#else
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#define BTRFS_FEATURE_INCOMPAT_SUPP \
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(BTRFS_FEATURE_INCOMPAT_SUPP_STABLE)
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#endif
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#define BTRFS_FEATURE_INCOMPAT_SAFE_SET \
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(BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
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#define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR 0ULL
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#define BTRFS_DEFAULT_COMMIT_INTERVAL (30)
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#define BTRFS_DEFAULT_MAX_INLINE (2048)
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struct btrfs_dev_replace {
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/* See #define above */
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u64 replace_state;
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/* Seconds since 1-Jan-1970 */
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time64_t time_started;
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/* Seconds since 1-Jan-1970 */
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time64_t time_stopped;
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atomic64_t num_write_errors;
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atomic64_t num_uncorrectable_read_errors;
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u64 cursor_left;
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u64 committed_cursor_left;
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u64 cursor_left_last_write_of_item;
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u64 cursor_right;
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/* See #define above */
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u64 cont_reading_from_srcdev_mode;
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int is_valid;
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int item_needs_writeback;
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struct btrfs_device *srcdev;
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struct btrfs_device *tgtdev;
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struct mutex lock_finishing_cancel_unmount;
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struct rw_semaphore rwsem;
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struct btrfs_scrub_progress scrub_progress;
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struct percpu_counter bio_counter;
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wait_queue_head_t replace_wait;
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};
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/*
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* Free clusters are used to claim free space in relatively large chunks,
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* allowing us to do less seeky writes. They are used for all metadata
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* allocations. In ssd_spread mode they are also used for data allocations.
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*/
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struct btrfs_free_cluster {
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spinlock_t lock;
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spinlock_t refill_lock;
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struct rb_root root;
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/* Largest extent in this cluster */
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u64 max_size;
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/* First extent starting offset */
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u64 window_start;
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/* We did a full search and couldn't create a cluster */
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bool fragmented;
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struct btrfs_block_group *block_group;
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/*
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* When a cluster is allocated from a block group, we put the cluster
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* onto a list in the block group so that it can be freed before the
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* block group is freed.
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*/
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struct list_head block_group_list;
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};
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/* Discard control. */
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/*
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* Async discard uses multiple lists to differentiate the discard filter
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* parameters. Index 0 is for completely free block groups where we need to
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* ensure the entire block group is trimmed without being lossy. Indices
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* afterwards represent monotonically decreasing discard filter sizes to
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* prioritize what should be discarded next.
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*/
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#define BTRFS_NR_DISCARD_LISTS 3
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#define BTRFS_DISCARD_INDEX_UNUSED 0
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#define BTRFS_DISCARD_INDEX_START 1
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struct btrfs_discard_ctl {
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struct workqueue_struct *discard_workers;
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struct delayed_work work;
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spinlock_t lock;
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struct btrfs_block_group *block_group;
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struct list_head discard_list[BTRFS_NR_DISCARD_LISTS];
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u64 prev_discard;
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u64 prev_discard_time;
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atomic_t discardable_extents;
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atomic64_t discardable_bytes;
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u64 max_discard_size;
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u64 delay_ms;
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u32 iops_limit;
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u32 kbps_limit;
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u64 discard_extent_bytes;
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u64 discard_bitmap_bytes;
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atomic64_t discard_bytes_saved;
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};
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/*
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* Exclusive operations (device replace, resize, device add/remove, balance)
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*/
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enum btrfs_exclusive_operation {
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BTRFS_EXCLOP_NONE,
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BTRFS_EXCLOP_BALANCE_PAUSED,
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BTRFS_EXCLOP_BALANCE,
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BTRFS_EXCLOP_DEV_ADD,
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BTRFS_EXCLOP_DEV_REMOVE,
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BTRFS_EXCLOP_DEV_REPLACE,
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BTRFS_EXCLOP_RESIZE,
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BTRFS_EXCLOP_SWAP_ACTIVATE,
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};
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/* Store data about transaction commits, exported via sysfs. */
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struct btrfs_commit_stats {
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/* Total number of commits */
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u64 commit_count;
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/* The maximum commit duration so far in ns */
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u64 max_commit_dur;
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/* The last commit duration in ns */
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u64 last_commit_dur;
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/* The total commit duration in ns */
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u64 total_commit_dur;
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};
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struct btrfs_fs_info {
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u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
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unsigned long flags;
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struct btrfs_root *tree_root;
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struct btrfs_root *chunk_root;
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struct btrfs_root *dev_root;
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struct btrfs_root *fs_root;
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struct btrfs_root *quota_root;
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struct btrfs_root *uuid_root;
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struct btrfs_root *data_reloc_root;
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struct btrfs_root *block_group_root;
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struct btrfs_root *stripe_root;
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/* The log root tree is a directory of all the other log roots */
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struct btrfs_root *log_root_tree;
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/* The tree that holds the global roots (csum, extent, etc) */
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rwlock_t global_root_lock;
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struct rb_root global_root_tree;
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spinlock_t fs_roots_radix_lock;
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struct radix_tree_root fs_roots_radix;
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/* Block group cache stuff */
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rwlock_t block_group_cache_lock;
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struct rb_root_cached block_group_cache_tree;
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/* Keep track of unallocated space */
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atomic64_t free_chunk_space;
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/* Track ranges which are used by log trees blocks/logged data extents */
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struct extent_io_tree excluded_extents;
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/* logical->physical extent mapping */
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struct rb_root_cached mapping_tree;
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rwlock_t mapping_tree_lock;
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/*
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* Block reservation for extent, checksum, root tree and delayed dir
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* index item.
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*/
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struct btrfs_block_rsv global_block_rsv;
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/* Block reservation for metadata operations */
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struct btrfs_block_rsv trans_block_rsv;
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/* Block reservation for chunk tree */
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struct btrfs_block_rsv chunk_block_rsv;
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/* Block reservation for delayed operations */
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struct btrfs_block_rsv delayed_block_rsv;
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/* Block reservation for delayed refs */
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struct btrfs_block_rsv delayed_refs_rsv;
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struct btrfs_block_rsv empty_block_rsv;
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/*
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* Updated while holding the lock 'trans_lock'. Due to the life cycle of
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* a transaction, it can be directly read while holding a transaction
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* handle, everywhere else must be read with btrfs_get_fs_generation().
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* Should always be updated using btrfs_set_fs_generation().
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*/
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u64 generation;
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/*
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* Always use btrfs_get_last_trans_committed() and
|
|
* btrfs_set_last_trans_committed() to read and update this field.
|
|
*/
|
|
u64 last_trans_committed;
|
|
/*
|
|
* Generation of the last transaction used for block group relocation
|
|
* since the filesystem was last mounted (or 0 if none happened yet).
|
|
* Must be written and read while holding btrfs_fs_info::commit_root_sem.
|
|
*/
|
|
u64 last_reloc_trans;
|
|
|
|
/*
|
|
* This is updated to the current trans every time a full commit is
|
|
* required instead of the faster short fsync log commits
|
|
*/
|
|
u64 last_trans_log_full_commit;
|
|
unsigned long mount_opt;
|
|
|
|
unsigned long compress_type:4;
|
|
unsigned int compress_level;
|
|
u32 commit_interval;
|
|
/*
|
|
* It is a suggestive number, the read side is safe even it gets a
|
|
* wrong number because we will write out the data into a regular
|
|
* extent. The write side(mount/remount) is under ->s_umount lock,
|
|
* so it is also safe.
|
|
*/
|
|
u64 max_inline;
|
|
|
|
struct btrfs_transaction *running_transaction;
|
|
wait_queue_head_t transaction_throttle;
|
|
wait_queue_head_t transaction_wait;
|
|
wait_queue_head_t transaction_blocked_wait;
|
|
wait_queue_head_t async_submit_wait;
|
|
|
|
/*
|
|
* Used to protect the incompat_flags, compat_flags, compat_ro_flags
|
|
* when they are updated.
|
|
*
|
|
* Because we do not clear the flags for ever, so we needn't use
|
|
* the lock on the read side.
|
|
*
|
|
* We also needn't use the lock when we mount the fs, because
|
|
* there is no other task which will update the flag.
|
|
*/
|
|
spinlock_t super_lock;
|
|
struct btrfs_super_block *super_copy;
|
|
struct btrfs_super_block *super_for_commit;
|
|
struct super_block *sb;
|
|
struct inode *btree_inode;
|
|
struct mutex tree_log_mutex;
|
|
struct mutex transaction_kthread_mutex;
|
|
struct mutex cleaner_mutex;
|
|
struct mutex chunk_mutex;
|
|
|
|
/*
|
|
* This is taken to make sure we don't set block groups ro after the
|
|
* free space cache has been allocated on them.
|
|
*/
|
|
struct mutex ro_block_group_mutex;
|
|
|
|
/*
|
|
* This is used during read/modify/write to make sure no two ios are
|
|
* trying to mod the same stripe at the same time.
|
|
*/
|
|
struct btrfs_stripe_hash_table *stripe_hash_table;
|
|
|
|
/*
|
|
* This protects the ordered operations list only while we are
|
|
* processing all of the entries on it. This way we make sure the
|
|
* commit code doesn't find the list temporarily empty because another
|
|
* function happens to be doing non-waiting preflush before jumping
|
|
* into the main commit.
|
|
*/
|
|
struct mutex ordered_operations_mutex;
|
|
|
|
struct rw_semaphore commit_root_sem;
|
|
|
|
struct rw_semaphore cleanup_work_sem;
|
|
|
|
struct rw_semaphore subvol_sem;
|
|
|
|
spinlock_t trans_lock;
|
|
/*
|
|
* The reloc mutex goes with the trans lock, it is taken during commit
|
|
* to protect us from the relocation code.
|
|
*/
|
|
struct mutex reloc_mutex;
|
|
|
|
struct list_head trans_list;
|
|
struct list_head dead_roots;
|
|
struct list_head caching_block_groups;
|
|
|
|
spinlock_t delayed_iput_lock;
|
|
struct list_head delayed_iputs;
|
|
atomic_t nr_delayed_iputs;
|
|
wait_queue_head_t delayed_iputs_wait;
|
|
|
|
atomic64_t tree_mod_seq;
|
|
|
|
/* This protects tree_mod_log and tree_mod_seq_list */
|
|
rwlock_t tree_mod_log_lock;
|
|
struct rb_root tree_mod_log;
|
|
struct list_head tree_mod_seq_list;
|
|
|
|
atomic_t async_delalloc_pages;
|
|
|
|
/* This is used to protect the following list -- ordered_roots. */
|
|
spinlock_t ordered_root_lock;
|
|
|
|
/*
|
|
* All fs/file tree roots in which there are data=ordered extents
|
|
* pending writeback are added into this list.
|
|
*
|
|
* These can span multiple transactions and basically include every
|
|
* dirty data page that isn't from nodatacow.
|
|
*/
|
|
struct list_head ordered_roots;
|
|
|
|
struct mutex delalloc_root_mutex;
|
|
spinlock_t delalloc_root_lock;
|
|
/* All fs/file tree roots that have delalloc inodes. */
|
|
struct list_head delalloc_roots;
|
|
|
|
/*
|
|
* There is a pool of worker threads for checksumming during writes and
|
|
* a pool for checksumming after reads. This is because readers can
|
|
* run with FS locks held, and the writers may be waiting for those
|
|
* locks. We don't want ordering in the pending list to cause
|
|
* deadlocks, and so the two are serviced separately.
|
|
*
|
|
* A third pool does submit_bio to avoid deadlocking with the other two.
|
|
*/
|
|
struct btrfs_workqueue *workers;
|
|
struct btrfs_workqueue *delalloc_workers;
|
|
struct btrfs_workqueue *flush_workers;
|
|
struct workqueue_struct *endio_workers;
|
|
struct workqueue_struct *endio_meta_workers;
|
|
struct workqueue_struct *rmw_workers;
|
|
struct workqueue_struct *compressed_write_workers;
|
|
struct btrfs_workqueue *endio_write_workers;
|
|
struct btrfs_workqueue *endio_freespace_worker;
|
|
struct btrfs_workqueue *caching_workers;
|
|
|
|
/*
|
|
* Fixup workers take dirty pages that didn't properly go through the
|
|
* cow mechanism and make them safe to write. It happens for the
|
|
* sys_munmap function call path.
|
|
*/
|
|
struct btrfs_workqueue *fixup_workers;
|
|
struct btrfs_workqueue *delayed_workers;
|
|
|
|
struct task_struct *transaction_kthread;
|
|
struct task_struct *cleaner_kthread;
|
|
u32 thread_pool_size;
|
|
|
|
struct kobject *space_info_kobj;
|
|
struct kobject *qgroups_kobj;
|
|
struct kobject *discard_kobj;
|
|
|
|
/* Used to keep from writing metadata until there is a nice batch */
|
|
struct percpu_counter dirty_metadata_bytes;
|
|
struct percpu_counter delalloc_bytes;
|
|
struct percpu_counter ordered_bytes;
|
|
s32 dirty_metadata_batch;
|
|
s32 delalloc_batch;
|
|
|
|
struct percpu_counter evictable_extent_maps;
|
|
u64 extent_map_shrinker_last_root;
|
|
u64 extent_map_shrinker_last_ino;
|
|
|
|
/* Protected by 'trans_lock'. */
|
|
struct list_head dirty_cowonly_roots;
|
|
|
|
struct btrfs_fs_devices *fs_devices;
|
|
|
|
/*
|
|
* The space_info list is effectively read only after initial setup.
|
|
* It is populated at mount time and cleaned up after all block groups
|
|
* are removed. RCU is used to protect it.
|
|
*/
|
|
struct list_head space_info;
|
|
|
|
struct btrfs_space_info *data_sinfo;
|
|
|
|
struct reloc_control *reloc_ctl;
|
|
|
|
/* data_alloc_cluster is only used in ssd_spread mode */
|
|
struct btrfs_free_cluster data_alloc_cluster;
|
|
|
|
/* All metadata allocations go through this cluster. */
|
|
struct btrfs_free_cluster meta_alloc_cluster;
|
|
|
|
/* Auto defrag inodes go here. */
|
|
spinlock_t defrag_inodes_lock;
|
|
struct rb_root defrag_inodes;
|
|
atomic_t defrag_running;
|
|
|
|
/* Used to protect avail_{data, metadata, system}_alloc_bits */
|
|
seqlock_t profiles_lock;
|
|
/*
|
|
* These three are in extended format (availability of single chunks is
|
|
* denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other types are denoted
|
|
* by corresponding BTRFS_BLOCK_GROUP_* bits)
|
|
*/
|
|
u64 avail_data_alloc_bits;
|
|
u64 avail_metadata_alloc_bits;
|
|
u64 avail_system_alloc_bits;
|
|
|
|
/* Balance state */
|
|
spinlock_t balance_lock;
|
|
struct mutex balance_mutex;
|
|
atomic_t balance_pause_req;
|
|
atomic_t balance_cancel_req;
|
|
struct btrfs_balance_control *balance_ctl;
|
|
wait_queue_head_t balance_wait_q;
|
|
|
|
/* Cancellation requests for chunk relocation */
|
|
atomic_t reloc_cancel_req;
|
|
|
|
u32 data_chunk_allocations;
|
|
u32 metadata_ratio;
|
|
|
|
void *bdev_holder;
|
|
|
|
/* Private scrub information */
|
|
struct mutex scrub_lock;
|
|
atomic_t scrubs_running;
|
|
atomic_t scrub_pause_req;
|
|
atomic_t scrubs_paused;
|
|
atomic_t scrub_cancel_req;
|
|
wait_queue_head_t scrub_pause_wait;
|
|
/*
|
|
* The worker pointers are NULL iff the refcount is 0, ie. scrub is not
|
|
* running.
|
|
*/
|
|
refcount_t scrub_workers_refcnt;
|
|
struct workqueue_struct *scrub_workers;
|
|
struct btrfs_subpage_info *subpage_info;
|
|
|
|
struct btrfs_discard_ctl discard_ctl;
|
|
|
|
/* Is qgroup tracking in a consistent state? */
|
|
u64 qgroup_flags;
|
|
|
|
/* Holds configuration and tracking. Protected by qgroup_lock. */
|
|
struct rb_root qgroup_tree;
|
|
spinlock_t qgroup_lock;
|
|
|
|
/*
|
|
* Used to avoid frequently calling ulist_alloc()/ulist_free()
|
|
* when doing qgroup accounting, it must be protected by qgroup_lock.
|
|
*/
|
|
struct ulist *qgroup_ulist;
|
|
|
|
/*
|
|
* Protect user change for quota operations. If a transaction is needed,
|
|
* it must be started before locking this lock.
|
|
*/
|
|
struct mutex qgroup_ioctl_lock;
|
|
|
|
/* List of dirty qgroups to be written at next commit. */
|
|
struct list_head dirty_qgroups;
|
|
|
|
/* Used by qgroup for an efficient tree traversal. */
|
|
u64 qgroup_seq;
|
|
|
|
/* Qgroup rescan items. */
|
|
/* Protects the progress item */
|
|
struct mutex qgroup_rescan_lock;
|
|
struct btrfs_key qgroup_rescan_progress;
|
|
struct btrfs_workqueue *qgroup_rescan_workers;
|
|
struct completion qgroup_rescan_completion;
|
|
struct btrfs_work qgroup_rescan_work;
|
|
/* Protected by qgroup_rescan_lock */
|
|
bool qgroup_rescan_running;
|
|
u8 qgroup_drop_subtree_thres;
|
|
u64 qgroup_enable_gen;
|
|
|
|
/*
|
|
* If this is not 0, then it indicates a serious filesystem error has
|
|
* happened and it contains that error (negative errno value).
|
|
*/
|
|
int fs_error;
|
|
|
|
/* Filesystem state */
|
|
unsigned long fs_state;
|
|
|
|
struct btrfs_delayed_root *delayed_root;
|
|
|
|
/* Extent buffer radix tree */
|
|
spinlock_t buffer_lock;
|
|
/* Entries are eb->start / sectorsize */
|
|
struct radix_tree_root buffer_radix;
|
|
|
|
/* Next backup root to be overwritten */
|
|
int backup_root_index;
|
|
|
|
/* Device replace state */
|
|
struct btrfs_dev_replace dev_replace;
|
|
|
|
struct semaphore uuid_tree_rescan_sem;
|
|
|
|
/* Used to reclaim the metadata space in the background. */
|
|
struct work_struct async_reclaim_work;
|
|
struct work_struct async_data_reclaim_work;
|
|
struct work_struct preempt_reclaim_work;
|
|
|
|
/* Reclaim partially filled block groups in the background */
|
|
struct work_struct reclaim_bgs_work;
|
|
/* Protected by unused_bgs_lock. */
|
|
struct list_head reclaim_bgs;
|
|
int bg_reclaim_threshold;
|
|
|
|
/* Protects the lists unused_bgs and reclaim_bgs. */
|
|
spinlock_t unused_bgs_lock;
|
|
/* Protected by unused_bgs_lock. */
|
|
struct list_head unused_bgs;
|
|
struct mutex unused_bg_unpin_mutex;
|
|
/* Protect block groups that are going to be deleted */
|
|
struct mutex reclaim_bgs_lock;
|
|
|
|
/* Cached block sizes */
|
|
u32 nodesize;
|
|
u32 sectorsize;
|
|
/* ilog2 of sectorsize, use to avoid 64bit division */
|
|
u32 sectorsize_bits;
|
|
u32 csum_size;
|
|
u32 csums_per_leaf;
|
|
u32 stripesize;
|
|
|
|
/*
|
|
* Maximum size of an extent. BTRFS_MAX_EXTENT_SIZE on regular
|
|
* filesystem, on zoned it depends on the device constraints.
|
|
*/
|
|
u64 max_extent_size;
|
|
|
|
/* Block groups and devices containing active swapfiles. */
|
|
spinlock_t swapfile_pins_lock;
|
|
struct rb_root swapfile_pins;
|
|
|
|
struct crypto_shash *csum_shash;
|
|
|
|
/* Type of exclusive operation running, protected by super_lock */
|
|
enum btrfs_exclusive_operation exclusive_operation;
|
|
|
|
/*
|
|
* Zone size > 0 when in ZONED mode, otherwise it's used for a check
|
|
* if the mode is enabled
|
|
*/
|
|
u64 zone_size;
|
|
|
|
/* Constraints for ZONE_APPEND commands: */
|
|
struct queue_limits limits;
|
|
u64 max_zone_append_size;
|
|
|
|
struct mutex zoned_meta_io_lock;
|
|
spinlock_t treelog_bg_lock;
|
|
u64 treelog_bg;
|
|
|
|
/*
|
|
* Start of the dedicated data relocation block group, protected by
|
|
* relocation_bg_lock.
|
|
*/
|
|
spinlock_t relocation_bg_lock;
|
|
u64 data_reloc_bg;
|
|
struct mutex zoned_data_reloc_io_lock;
|
|
|
|
struct btrfs_block_group *active_meta_bg;
|
|
struct btrfs_block_group *active_system_bg;
|
|
|
|
u64 nr_global_roots;
|
|
|
|
spinlock_t zone_active_bgs_lock;
|
|
struct list_head zone_active_bgs;
|
|
|
|
/* Updates are not protected by any lock */
|
|
struct btrfs_commit_stats commit_stats;
|
|
|
|
/*
|
|
* Last generation where we dropped a non-relocation root.
|
|
* Use btrfs_set_last_root_drop_gen() and btrfs_get_last_root_drop_gen()
|
|
* to change it and to read it, respectively.
|
|
*/
|
|
u64 last_root_drop_gen;
|
|
|
|
/*
|
|
* Annotations for transaction events (structures are empty when
|
|
* compiled without lockdep).
|
|
*/
|
|
struct lockdep_map btrfs_trans_num_writers_map;
|
|
struct lockdep_map btrfs_trans_num_extwriters_map;
|
|
struct lockdep_map btrfs_state_change_map[4];
|
|
struct lockdep_map btrfs_trans_pending_ordered_map;
|
|
struct lockdep_map btrfs_ordered_extent_map;
|
|
|
|
#ifdef CONFIG_BTRFS_FS_REF_VERIFY
|
|
spinlock_t ref_verify_lock;
|
|
struct rb_root block_tree;
|
|
#endif
|
|
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
struct kobject *debug_kobj;
|
|
struct list_head allocated_roots;
|
|
|
|
spinlock_t eb_leak_lock;
|
|
struct list_head allocated_ebs;
|
|
#endif
|
|
};
|
|
|
|
#define page_to_inode(_page) (BTRFS_I(_Generic((_page), \
|
|
struct page *: (_page))->mapping->host))
|
|
#define folio_to_inode(_folio) (BTRFS_I(_Generic((_folio), \
|
|
struct folio *: (_folio))->mapping->host))
|
|
|
|
#define page_to_fs_info(_page) (page_to_inode(_page)->root->fs_info)
|
|
#define folio_to_fs_info(_folio) (folio_to_inode(_folio)->root->fs_info)
|
|
|
|
#define inode_to_fs_info(_inode) (BTRFS_I(_Generic((_inode), \
|
|
struct inode *: (_inode)))->root->fs_info)
|
|
|
|
static inline u64 btrfs_get_fs_generation(const struct btrfs_fs_info *fs_info)
|
|
{
|
|
return READ_ONCE(fs_info->generation);
|
|
}
|
|
|
|
static inline void btrfs_set_fs_generation(struct btrfs_fs_info *fs_info, u64 gen)
|
|
{
|
|
WRITE_ONCE(fs_info->generation, gen);
|
|
}
|
|
|
|
static inline u64 btrfs_get_last_trans_committed(const struct btrfs_fs_info *fs_info)
|
|
{
|
|
return READ_ONCE(fs_info->last_trans_committed);
|
|
}
|
|
|
|
static inline void btrfs_set_last_trans_committed(struct btrfs_fs_info *fs_info, u64 gen)
|
|
{
|
|
WRITE_ONCE(fs_info->last_trans_committed, gen);
|
|
}
|
|
|
|
static inline void btrfs_set_last_root_drop_gen(struct btrfs_fs_info *fs_info,
|
|
u64 gen)
|
|
{
|
|
WRITE_ONCE(fs_info->last_root_drop_gen, gen);
|
|
}
|
|
|
|
static inline u64 btrfs_get_last_root_drop_gen(const struct btrfs_fs_info *fs_info)
|
|
{
|
|
return READ_ONCE(fs_info->last_root_drop_gen);
|
|
}
|
|
|
|
/*
|
|
* Take the number of bytes to be checksummed and figure out how many leaves
|
|
* it would require to store the csums for that many bytes.
|
|
*/
|
|
static inline u64 btrfs_csum_bytes_to_leaves(
|
|
const struct btrfs_fs_info *fs_info, u64 csum_bytes)
|
|
{
|
|
const u64 num_csums = csum_bytes >> fs_info->sectorsize_bits;
|
|
|
|
return DIV_ROUND_UP_ULL(num_csums, fs_info->csums_per_leaf);
|
|
}
|
|
|
|
/*
|
|
* Use this if we would be adding new items, as we could split nodes as we cow
|
|
* down the tree.
|
|
*/
|
|
static inline u64 btrfs_calc_insert_metadata_size(const struct btrfs_fs_info *fs_info,
|
|
unsigned num_items)
|
|
{
|
|
return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
|
|
}
|
|
|
|
/*
|
|
* Doing a truncate or a modification won't result in new nodes or leaves, just
|
|
* what we need for COW.
|
|
*/
|
|
static inline u64 btrfs_calc_metadata_size(const struct btrfs_fs_info *fs_info,
|
|
unsigned num_items)
|
|
{
|
|
return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
|
|
}
|
|
|
|
#define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
|
|
sizeof(struct btrfs_item))
|
|
|
|
static inline bool btrfs_is_zoned(const struct btrfs_fs_info *fs_info)
|
|
{
|
|
return IS_ENABLED(CONFIG_BLK_DEV_ZONED) && fs_info->zone_size > 0;
|
|
}
|
|
|
|
/*
|
|
* Count how many fs_info->max_extent_size cover the @size
|
|
*/
|
|
static inline u32 count_max_extents(struct btrfs_fs_info *fs_info, u64 size)
|
|
{
|
|
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
|
|
if (!fs_info)
|
|
return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE);
|
|
#endif
|
|
|
|
return div_u64(size + fs_info->max_extent_size - 1, fs_info->max_extent_size);
|
|
}
|
|
|
|
bool btrfs_exclop_start(struct btrfs_fs_info *fs_info,
|
|
enum btrfs_exclusive_operation type);
|
|
bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info,
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enum btrfs_exclusive_operation type);
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void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info);
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void btrfs_exclop_finish(struct btrfs_fs_info *fs_info);
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void btrfs_exclop_balance(struct btrfs_fs_info *fs_info,
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enum btrfs_exclusive_operation op);
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|
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int btrfs_check_ioctl_vol_args_path(const struct btrfs_ioctl_vol_args *vol_args);
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|
|
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/* Compatibility and incompatibility defines */
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void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag,
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const char *name);
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void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag,
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|
const char *name);
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void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag,
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|
const char *name);
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void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag,
|
|
const char *name);
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|
|
|
#define __btrfs_fs_incompat(fs_info, flags) \
|
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(!!(btrfs_super_incompat_flags((fs_info)->super_copy) & (flags)))
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|
|
|
#define __btrfs_fs_compat_ro(fs_info, flags) \
|
|
(!!(btrfs_super_compat_ro_flags((fs_info)->super_copy) & (flags)))
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|
|
|
#define btrfs_set_fs_incompat(__fs_info, opt) \
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|
__btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, #opt)
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|
|
|
#define btrfs_clear_fs_incompat(__fs_info, opt) \
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|
__btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, #opt)
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|
|
|
#define btrfs_fs_incompat(fs_info, opt) \
|
|
__btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
|
|
|
|
#define btrfs_set_fs_compat_ro(__fs_info, opt) \
|
|
__btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, #opt)
|
|
|
|
#define btrfs_clear_fs_compat_ro(__fs_info, opt) \
|
|
__btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, #opt)
|
|
|
|
#define btrfs_fs_compat_ro(fs_info, opt) \
|
|
__btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
|
|
|
|
#define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
|
|
#define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
|
|
#define btrfs_raw_test_opt(o, opt) ((o) & BTRFS_MOUNT_##opt)
|
|
#define btrfs_test_opt(fs_info, opt) ((fs_info)->mount_opt & \
|
|
BTRFS_MOUNT_##opt)
|
|
|
|
static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
|
|
{
|
|
/* Do it this way so we only ever do one test_bit in the normal case. */
|
|
if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
|
|
if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
|
|
return 2;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If we remount the fs to be R/O or umount the fs, the cleaner needn't do
|
|
* anything except sleeping. This function is used to check the status of
|
|
* the fs.
|
|
* We check for BTRFS_FS_STATE_RO to avoid races with a concurrent remount,
|
|
* since setting and checking for SB_RDONLY in the superblock's flags is not
|
|
* atomic.
|
|
*/
|
|
static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
|
|
{
|
|
return test_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state) ||
|
|
btrfs_fs_closing(fs_info);
|
|
}
|
|
|
|
static inline void btrfs_wake_unfinished_drop(struct btrfs_fs_info *fs_info)
|
|
{
|
|
clear_and_wake_up_bit(BTRFS_FS_UNFINISHED_DROPS, &fs_info->flags);
|
|
}
|
|
|
|
#define BTRFS_FS_ERROR(fs_info) (READ_ONCE((fs_info)->fs_error))
|
|
|
|
#define BTRFS_FS_LOG_CLEANUP_ERROR(fs_info) \
|
|
(unlikely(test_bit(BTRFS_FS_STATE_LOG_CLEANUP_ERROR, \
|
|
&(fs_info)->fs_state)))
|
|
|
|
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
|
|
|
|
#define EXPORT_FOR_TESTS
|
|
|
|
static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
|
|
{
|
|
return test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
|
|
}
|
|
|
|
void btrfs_test_destroy_inode(struct inode *inode);
|
|
|
|
#else
|
|
|
|
#define EXPORT_FOR_TESTS static
|
|
|
|
static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#endif
|