fs/btrfs/ordered-data.h - kernel/bruno - Git at Google

 /*
  * Copyright (C) 2007 Oracle.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public
  * License v2 as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * General Public License for more details.
  *
  * You should have received a copy of the GNU General Public
  * License along with this program; if not, write to the
  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  * Boston, MA 021110-1307, USA.
  */

 #ifndef __BTRFS_ORDERED_DATA__
 #define __BTRFS_ORDERED_DATA__

 /* one of these per inode */
 struct btrfs_ordered_inode_tree {
 	spinlock_t lock;
 	struct rb_root tree;
 	struct rb_node *last;
 };

 struct btrfs_ordered_sum {
 	/* bytenr is the start of this extent on disk */
 	u64 bytenr;

 	/*
 	 * this is the length in bytes covered by the sums array below.
 	 */
 	int len;
 	struct list_head list;
 	/* last field is a variable length array of csums */
 	u32 sums[];
 };

 /*
  * bits for the flags field:
  *
  * BTRFS_ORDERED_IO_DONE is set when all of the blocks are written.
  * It is used to make sure metadata is inserted into the tree only once
  * per extent.
  *
  * BTRFS_ORDERED_COMPLETE is set when the extent is removed from the
  * rbtree, just before waking any waiters.  It is used to indicate the
  * IO is done and any metadata is inserted into the tree.
  */
 #define BTRFS_ORDERED_IO_DONE 0 /* set when all the pages are written */

 #define BTRFS_ORDERED_COMPLETE 1 /* set when removed from the tree */

 #define BTRFS_ORDERED_NOCOW 2 /* set when we want to write in place */

 #define BTRFS_ORDERED_COMPRESSED 3 /* writing a zlib compressed extent */

 #define BTRFS_ORDERED_PREALLOC 4 /* set when writing to prealloced extent */

 #define BTRFS_ORDERED_DIRECT 5 /* set when we're doing DIO with this extent */

 #define BTRFS_ORDERED_IOERR 6 /* We had an io error when writing this out */

 #define BTRFS_ORDERED_UPDATED_ISIZE 7 /* indicates whether this ordered extent
 				       * has done its due diligence in updating
 				       * the isize. */
 #define BTRFS_ORDERED_LOGGED_CSUM 8 /* We've logged the csums on this ordered
 				       ordered extent */
 #define BTRFS_ORDERED_TRUNCATED 9 /* Set when we have to truncate an extent */

 #define BTRFS_ORDERED_LOGGED 10 /* Set when we've waited on this ordered extent
 				 * in the logging code. */
 #define BTRFS_ORDERED_PENDING 11 /* We are waiting for this ordered extent to
 				  * complete in the current transaction. */
 struct btrfs_ordered_extent {
 	/* logical offset in the file */
 	u64 file_offset;

 	/* disk byte number */
 	u64 start;

 	/* ram length of the extent in bytes */
 	u64 len;

 	/* extent length on disk */
 	u64 disk_len;

 	/* number of bytes that still need writing */
 	u64 bytes_left;

 	/*
 	 * the end of the ordered extent which is behind it but
 	 * didn't update disk_i_size. Please see the comment of
 	 * btrfs_ordered_update_i_size();
 	 */
 	u64 outstanding_isize;

 	/*
 	 * If we get truncated we need to adjust the file extent we enter for
 	 * this ordered extent so that we do not expose stale data.
 	 */
 	u64 truncated_len;

 	/* flags (described above) */
 	unsigned long flags;

 	/* compression algorithm */
 	int compress_type;

 	/* reference count */
 	atomic_t refs;

 	/* the inode we belong to */
 	struct inode *inode;

 	/* list of checksums for insertion when the extent io is done */
 	struct list_head list;

 	/* If we need to wait on this to be done */
 	struct list_head log_list;

 	/* If the transaction needs to wait on this ordered extent */
 	struct list_head trans_list;

 	/* used to wait for the BTRFS_ORDERED_COMPLETE bit */
 	wait_queue_head_t wait;

 	/* our friendly rbtree entry */
 	struct rb_node rb_node;

 	/* a per root list of all the pending ordered extents */
 	struct list_head root_extent_list;

 	struct btrfs_work work;

 	struct completion completion;
 	struct btrfs_work flush_work;
 	struct list_head work_list;
 };

 /*
  * calculates the total size you need to allocate for an ordered sum
  * structure spanning 'bytes' in the file
  */
 static inline int btrfs_ordered_sum_size(struct btrfs_root *root,
 					 unsigned long bytes)
 {
 	int num_sectors = (int)DIV_ROUND_UP(bytes, root->sectorsize);
 	return sizeof(struct btrfs_ordered_sum) + num_sectors * sizeof(u32);
 }

 static inline void
 btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t)
 {
 	spin_lock_init(&t->lock);
 	t->tree = RB_ROOT;
 	t->last = NULL;
 }

 void btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry);
 void btrfs_remove_ordered_extent(struct inode *inode,
 				struct btrfs_ordered_extent *entry);
 int btrfs_dec_test_ordered_pending(struct inode *inode,
 				   struct btrfs_ordered_extent **cached,
 				   u64 file_offset, u64 io_size, int uptodate);
 int btrfs_dec_test_first_ordered_pending(struct inode *inode,
 				   struct btrfs_ordered_extent **cached,
 				   u64 *file_offset, u64 io_size,
 				   int uptodate);
 int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
 			     u64 start, u64 len, u64 disk_len, int type);
 int btrfs_add_ordered_extent_dio(struct inode *inode, u64 file_offset,
 				 u64 start, u64 len, u64 disk_len, int type);
 int btrfs_add_ordered_extent_compress(struct inode *inode, u64 file_offset,
 				      u64 start, u64 len, u64 disk_len,
 				      int type, int compress_type);
 void btrfs_add_ordered_sum(struct inode *inode,
 			   struct btrfs_ordered_extent *entry,
 			   struct btrfs_ordered_sum *sum);
 struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode,
 							 u64 file_offset);
 void btrfs_start_ordered_extent(struct inode *inode,
 				struct btrfs_ordered_extent *entry, int wait);
 int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len);
 struct btrfs_ordered_extent *
 btrfs_lookup_first_ordered_extent(struct inode * inode, u64 file_offset);
 struct btrfs_ordered_extent *btrfs_lookup_ordered_range(struct inode *inode,
 							u64 file_offset,
 							u64 len);
 bool btrfs_have_ordered_extents_in_range(struct inode *inode,
 					 u64 file_offset,
 					 u64 len);
 int btrfs_ordered_update_i_size(struct inode *inode, u64 offset,
 				struct btrfs_ordered_extent *ordered);
 int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr,
 			   u32 *sum, int len);
 int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr);
 void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, int nr);
 void btrfs_get_logged_extents(struct inode *inode,
 			      struct list_head *logged_list,
 			      const loff_t start,
 			      const loff_t end);
 void btrfs_put_logged_extents(struct list_head *logged_list);
 void btrfs_submit_logged_extents(struct list_head *logged_list,
 				 struct btrfs_root *log);
 void btrfs_wait_logged_extents(struct btrfs_trans_handle *trans,
 			       struct btrfs_root *log, u64 transid);
 void btrfs_free_logged_extents(struct btrfs_root *log, u64 transid);
 int __init ordered_data_init(void);
 void ordered_data_exit(void);
 #endif
	/*
	* Copyright (C) 2007 Oracle. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public
	* License v2 as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public
	* License along with this program; if not, write to the
	* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	* Boston, MA 021110-1307, USA.
	*/

	#ifndef __BTRFS_ORDERED_DATA__
	#define __BTRFS_ORDERED_DATA__

	/* one of these per inode */
	struct btrfs_ordered_inode_tree {
	spinlock_t lock;
	struct rb_root tree;
	struct rb_node *last;
	};

	struct btrfs_ordered_sum {
	/* bytenr is the start of this extent on disk */
	u64 bytenr;

	/*
	* this is the length in bytes covered by the sums array below.
	*/
	int len;
	struct list_head list;
	/* last field is a variable length array of csums */
	u32 sums[];
	};

	/*
	* bits for the flags field:
	*
	* BTRFS_ORDERED_IO_DONE is set when all of the blocks are written.
	* It is used to make sure metadata is inserted into the tree only once
	* per extent.
	*
	* BTRFS_ORDERED_COMPLETE is set when the extent is removed from the
	* rbtree, just before waking any waiters. It is used to indicate the
	* IO is done and any metadata is inserted into the tree.
	*/
	#define BTRFS_ORDERED_IO_DONE 0 /* set when all the pages are written */

	#define BTRFS_ORDERED_COMPLETE 1 /* set when removed from the tree */

	#define BTRFS_ORDERED_NOCOW 2 /* set when we want to write in place */

	#define BTRFS_ORDERED_COMPRESSED 3 /* writing a zlib compressed extent */

	#define BTRFS_ORDERED_PREALLOC 4 /* set when writing to prealloced extent */

	#define BTRFS_ORDERED_DIRECT 5 /* set when we're doing DIO with this extent */

	#define BTRFS_ORDERED_IOERR 6 /* We had an io error when writing this out */

	#define BTRFS_ORDERED_UPDATED_ISIZE 7 /* indicates whether this ordered extent
	* has done its due diligence in updating
	* the isize. */
	#define BTRFS_ORDERED_LOGGED_CSUM 8 /* We've logged the csums on this ordered
	ordered extent */
	#define BTRFS_ORDERED_TRUNCATED 9 /* Set when we have to truncate an extent */

	#define BTRFS_ORDERED_LOGGED 10 /* Set when we've waited on this ordered extent
	* in the logging code. */
	#define BTRFS_ORDERED_PENDING 11 /* We are waiting for this ordered extent to
	* complete in the current transaction. */
	struct btrfs_ordered_extent {
	/* logical offset in the file */
	u64 file_offset;

	/* disk byte number */
	u64 start;

	/* ram length of the extent in bytes */
	u64 len;

	/* extent length on disk */
	u64 disk_len;

	/* number of bytes that still need writing */
	u64 bytes_left;

	/*
	* the end of the ordered extent which is behind it but
	* didn't update disk_i_size. Please see the comment of
	* btrfs_ordered_update_i_size();
	*/
	u64 outstanding_isize;

	/*
	* If we get truncated we need to adjust the file extent we enter for
	* this ordered extent so that we do not expose stale data.
	*/
	u64 truncated_len;

	/* flags (described above) */
	unsigned long flags;

	/* compression algorithm */
	int compress_type;

	/* reference count */
	atomic_t refs;

	/* the inode we belong to */
	struct inode *inode;

	/* list of checksums for insertion when the extent io is done */
	struct list_head list;

	/* If we need to wait on this to be done */
	struct list_head log_list;

	/* If the transaction needs to wait on this ordered extent */
	struct list_head trans_list;

	/* used to wait for the BTRFS_ORDERED_COMPLETE bit */
	wait_queue_head_t wait;

	/* our friendly rbtree entry */
	struct rb_node rb_node;

	/* a per root list of all the pending ordered extents */
	struct list_head root_extent_list;

	struct btrfs_work work;

	struct completion completion;
	struct btrfs_work flush_work;
	struct list_head work_list;
	};

	/*
	* calculates the total size you need to allocate for an ordered sum
	* structure spanning 'bytes' in the file
	*/
	static inline int btrfs_ordered_sum_size(struct btrfs_root *root,
	unsigned long bytes)
	{
	int num_sectors = (int)DIV_ROUND_UP(bytes, root->sectorsize);
	return sizeof(struct btrfs_ordered_sum) + num_sectors * sizeof(u32);
	}

	static inline void
	btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t)
	{
	spin_lock_init(&t->lock);
	t->tree = RB_ROOT;
	t->last = NULL;
	}

	void btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry);
	void btrfs_remove_ordered_extent(struct inode *inode,
	struct btrfs_ordered_extent *entry);
	int btrfs_dec_test_ordered_pending(struct inode *inode,
	struct btrfs_ordered_extent **cached,
	u64 file_offset, u64 io_size, int uptodate);
	int btrfs_dec_test_first_ordered_pending(struct inode *inode,
	struct btrfs_ordered_extent **cached,
	u64 *file_offset, u64 io_size,
	int uptodate);
	int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
	u64 start, u64 len, u64 disk_len, int type);
	int btrfs_add_ordered_extent_dio(struct inode *inode, u64 file_offset,
	u64 start, u64 len, u64 disk_len, int type);
	int btrfs_add_ordered_extent_compress(struct inode *inode, u64 file_offset,
	u64 start, u64 len, u64 disk_len,
	int type, int compress_type);
	void btrfs_add_ordered_sum(struct inode *inode,
	struct btrfs_ordered_extent *entry,
	struct btrfs_ordered_sum *sum);
	struct btrfs_ordered_extent btrfs_lookup_ordered_extent(struct inode inode,
	u64 file_offset);
	void btrfs_start_ordered_extent(struct inode *inode,
	struct btrfs_ordered_extent *entry, int wait);
	int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len);
	struct btrfs_ordered_extent *
	btrfs_lookup_first_ordered_extent(struct inode * inode, u64 file_offset);
	struct btrfs_ordered_extent btrfs_lookup_ordered_range(struct inode inode,
	u64 file_offset,
	u64 len);
	bool btrfs_have_ordered_extents_in_range(struct inode *inode,
	u64 file_offset,
	u64 len);
	int btrfs_ordered_update_i_size(struct inode *inode, u64 offset,
	struct btrfs_ordered_extent *ordered);
	int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr,
	u32 *sum, int len);
	int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr);
	void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, int nr);
	void btrfs_get_logged_extents(struct inode *inode,
	struct list_head *logged_list,
	const loff_t start,
	const loff_t end);
	void btrfs_put_logged_extents(struct list_head *logged_list);
	void btrfs_submit_logged_extents(struct list_head *logged_list,
	struct btrfs_root *log);
	void btrfs_wait_logged_extents(struct btrfs_trans_handle *trans,
	struct btrfs_root *log, u64 transid);
	void btrfs_free_logged_extents(struct btrfs_root *log, u64 transid);
	int __init ordered_data_init(void);
	void ordered_data_exit(void);
	#endif