Commit aac0023c authored by Josef Bacik's avatar Josef Bacik Committed by David Sterba
Browse files

btrfs: move basic block_group definitions to their own header 



This is prep work for moving all of the block group cache code into its
own file.

Signed-off-by: default avatarJosef Bacik <josef@toxicpanda.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
[ minor comment updates ]
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 478b4d9f

fs/btrfs/block-group.h

0 → 100644
+154 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */



#ifndef BTRFS_BLOCK_GROUP_H

#define BTRFS_BLOCK_GROUP_H



enum btrfs_disk_cache_state {

	BTRFS_DC_WRITTEN,

	BTRFS_DC_ERROR,

	BTRFS_DC_CLEAR,

	BTRFS_DC_SETUP,

};



struct btrfs_caching_control {

	struct list_head list;

	struct mutex mutex;

	wait_queue_head_t wait;

	struct btrfs_work work;

	struct btrfs_block_group_cache *block_group;

	u64 progress;

	refcount_t count;

};



/* Once caching_thread() finds this much free space, it will wake up waiters. */

#define CACHING_CTL_WAKE_UP SZ_2M



struct btrfs_block_group_cache {

	struct btrfs_key key;

	struct btrfs_block_group_item item;

	struct btrfs_fs_info *fs_info;

	struct inode *inode;

	spinlock_t lock;

	u64 pinned;

	u64 reserved;

	u64 delalloc_bytes;

	u64 bytes_super;

	u64 flags;

	u64 cache_generation;



	/*

	 * If the free space extent count exceeds this number, convert the block

	 * group to bitmaps.

	 */

	u32 bitmap_high_thresh;



	/*

	 * If the free space extent count drops below this number, convert the

	 * block group back to extents.

	 */

	u32 bitmap_low_thresh;



	/*

	 * It is just used for the delayed data space allocation because

	 * only the data space allocation and the relative metadata update

	 * can be done cross the transaction.

	 */

	struct rw_semaphore data_rwsem;



	/* For raid56, this is a full stripe, without parity */

	unsigned long full_stripe_len;



	unsigned int ro;

	unsigned int iref:1;

	unsigned int has_caching_ctl:1;

	unsigned int removed:1;



	int disk_cache_state;



	/* Cache tracking stuff */

	int cached;

	struct btrfs_caching_control *caching_ctl;

	u64 last_byte_to_unpin;



	struct btrfs_space_info *space_info;



	/* Free space cache stuff */

	struct btrfs_free_space_ctl *free_space_ctl;



	/* Block group cache stuff */

	struct rb_node cache_node;



	/* For block groups in the same raid type */

	struct list_head list;



	/* Usage count */

	atomic_t count;



	/*

	 * List of struct btrfs_free_clusters for this block group.

	 * Today it will only have one thing on it, but that may change

	 */

	struct list_head cluster_list;



	/* For delayed block group creation or deletion of empty block groups */

	struct list_head bg_list;



	/* For read-only block groups */

	struct list_head ro_list;



	atomic_t trimming;



	/* For dirty block groups */

	struct list_head dirty_list;

	struct list_head io_list;



	struct btrfs_io_ctl io_ctl;



	/*

	 * Incremented when doing extent allocations and holding a read lock

	 * on the space_info's groups_sem semaphore.

	 * Decremented when an ordered extent that represents an IO against this

	 * block group's range is created (after it's added to its inode's

	 * root's list of ordered extents) or immediately after the allocation

	 * if it's a metadata extent or fallocate extent (for these cases we

	 * don't create ordered extents).

	 */

	atomic_t reservations;



	/*

	 * Incremented while holding the spinlock *lock* by a task checking if

	 * it can perform a nocow write (incremented if the value for the *ro*

	 * field is 0). Decremented by such tasks once they create an ordered

	 * extent or before that if some error happens before reaching that step.

	 * This is to prevent races between block group relocation and nocow

	 * writes through direct IO.

	 */

	atomic_t nocow_writers;



	/* Lock for free space tree operations. */

	struct mutex free_space_lock;



	/*

	 * Does the block group need to be added to the free space tree?

	 * Protected by free_space_lock.

	 */

	int needs_free_space;



	/* Record locked full stripes for RAID5/6 block group */

	struct btrfs_full_stripe_locks_tree full_stripe_locks_root;

};



#ifdef CONFIG_BTRFS_DEBUG

static inline int btrfs_should_fragment_free_space(

		struct btrfs_block_group_cache *block_group)

{

	struct btrfs_fs_info *fs_info = block_group->fs_info;



	return (btrfs_test_opt(fs_info, FRAGMENT_METADATA) &&

		block_group->flags & BTRFS_BLOCK_GROUP_METADATA) ||

	       (btrfs_test_opt(fs_info, FRAGMENT_DATA) &&

		block_group->flags &  BTRFS_BLOCK_GROUP_DATA);

}

#endif



#endif /* BTRFS_BLOCK_GROUP_H */

fs/btrfs/ctree.h

+1 −147
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@ struct btrfs_transaction; 
struct btrfs_pending_snapshot;

struct btrfs_delayed_ref_root;

struct btrfs_space_info;

struct btrfs_block_group_cache;

extern struct kmem_cache *btrfs_trans_handle_cachep;

extern struct kmem_cache *btrfs_bit_radix_cachep;

extern struct kmem_cache *btrfs_path_cachep;
@@ -439,26 +440,6 @@ enum btrfs_caching_type { 
	BTRFS_CACHE_ERROR,

};



enum btrfs_disk_cache_state {

	BTRFS_DC_WRITTEN,

	BTRFS_DC_ERROR,

	BTRFS_DC_CLEAR,

	BTRFS_DC_SETUP,

};



struct btrfs_caching_control {

	struct list_head list;

	struct mutex mutex;

	wait_queue_head_t wait;

	struct btrfs_work work;

	struct btrfs_block_group_cache *block_group;

	u64 progress;

	refcount_t count;

};



/* Once caching_thread() finds this much free space, it will wake up waiters. */

#define CACHING_CTL_WAKE_UP SZ_2M



struct btrfs_io_ctl {

	void *cur, *orig;

	struct page *page;
@@ -481,120 +462,6 @@ struct btrfs_full_stripe_locks_tree { 
	struct mutex lock;

};



struct btrfs_block_group_cache {

	struct btrfs_key key;

	struct btrfs_block_group_item item;

	struct btrfs_fs_info *fs_info;

	struct inode *inode;

	spinlock_t lock;

	u64 pinned;

	u64 reserved;

	u64 delalloc_bytes;

	u64 bytes_super;

	u64 flags;

	u64 cache_generation;



	/*

	 * If the free space extent count exceeds this number, convert the block

	 * group to bitmaps.

	 */

	u32 bitmap_high_thresh;



	/*

	 * If the free space extent count drops below this number, convert the

	 * block group back to extents.

	 */

	u32 bitmap_low_thresh;



	/*

	 * It is just used for the delayed data space allocation because

	 * only the data space allocation and the relative metadata update

	 * can be done cross the transaction.

	 */

	struct rw_semaphore data_rwsem;



	/* for raid56, this is a full stripe, without parity */

	unsigned long full_stripe_len;



	unsigned int ro;

	unsigned int iref:1;

	unsigned int has_caching_ctl:1;

	unsigned int removed:1;



	int disk_cache_state;



	/* cache tracking stuff */

	int cached;

	struct btrfs_caching_control *caching_ctl;

	u64 last_byte_to_unpin;



	struct btrfs_space_info *space_info;



	/* free space cache stuff */

	struct btrfs_free_space_ctl *free_space_ctl;



	/* block group cache stuff */

	struct rb_node cache_node;



	/* for block groups in the same raid type */

	struct list_head list;



	/* usage count */

	atomic_t count;



	/* List of struct btrfs_free_clusters for this block group.

	 * Today it will only have one thing on it, but that may change

	 */

	struct list_head cluster_list;



	/* For delayed block group creation or deletion of empty block groups */

	struct list_head bg_list;



	/* For read-only block groups */

	struct list_head ro_list;



	atomic_t trimming;



	/* For dirty block groups */

	struct list_head dirty_list;

	struct list_head io_list;



	struct btrfs_io_ctl io_ctl;



	/*

	 * Incremented when doing extent allocations and holding a read lock

	 * on the space_info's groups_sem semaphore.

	 * Decremented when an ordered extent that represents an IO against this

	 * block group's range is created (after it's added to its inode's

	 * root's list of ordered extents) or immediately after the allocation

	 * if it's a metadata extent or fallocate extent (for these cases we

	 * don't create ordered extents).

	 */

	atomic_t reservations;



	/*

	 * Incremented while holding the spinlock *lock* by a task checking if

	 * it can perform a nocow write (incremented if the value for the *ro*

	 * field is 0). Decremented by such tasks once they create an ordered

	 * extent or before that if some error happens before reaching that step.

	 * This is to prevent races between block group relocation and nocow

	 * writes through direct IO.

	 */

	atomic_t nocow_writers;



	/* Lock for free space tree operations. */

	struct mutex free_space_lock;



	/*

	 * Does the block group need to be added to the free space tree?

	 * Protected by free_space_lock.

	 */

	int needs_free_space;



	/* Record locked full stripes for RAID5/6 block group */

	struct btrfs_full_stripe_locks_tree full_stripe_locks_root;

};



/* delayed seq elem */

struct seq_list {

	struct list_head list;
@@ -1387,19 +1254,6 @@ static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info) 
	btrfs_clear_opt(fs_info->mount_opt, opt);			\

}



#ifdef CONFIG_BTRFS_DEBUG

static inline int

btrfs_should_fragment_free_space(struct btrfs_block_group_cache *block_group)

{

	struct btrfs_fs_info *fs_info = block_group->fs_info;



	return (btrfs_test_opt(fs_info, FRAGMENT_METADATA) &&

		block_group->flags & BTRFS_BLOCK_GROUP_METADATA) ||

	       (btrfs_test_opt(fs_info, FRAGMENT_DATA) &&

		block_group->flags &  BTRFS_BLOCK_GROUP_DATA);

}

#endif



/*

 * Requests for changes that need to be done during transaction commit.

 *

fs/btrfs/disk-io.c

+1 −0
Original line number Diff line number Diff line
@@ -40,6 +40,7 @@ 
#include "compression.h"

#include "tree-checker.h"

#include "ref-verify.h"

#include "block-group.h"



#define BTRFS_SUPER_FLAG_SUPP	(BTRFS_HEADER_FLAG_WRITTEN |\

				 BTRFS_HEADER_FLAG_RELOC |\

fs/btrfs/extent-tree.c

+1 −0
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ 
#include "space-info.h"

#include "block-rsv.h"

#include "delalloc-space.h"

#include "block-group.h"



#undef SCRAMBLE_DELAYED_REFS

fs/btrfs/free-space-cache.c

+1 −0
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ 
#include "volumes.h"

#include "space-info.h"

#include "delalloc-space.h"

#include "block-group.h"



#define BITS_PER_BITMAP		(PAGE_SIZE * 8UL)

#define MAX_CACHE_BYTES_PER_GIG	SZ_32K

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