/* * 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 */ 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; 	/* number of bytes that still need csumming */	u64 csum_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; 	/* 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 voidbtrfs_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);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_run_ordered_operations(struct btrfs_trans_handle *trans,				 struct btrfs_root *root, int wait);void btrfs_add_ordered_operation(struct btrfs_trans_handle *trans,				 struct btrfs_root *root,				 struct inode *inode);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 btrfs_root *log, struct inode *inode);void btrfs_wait_logged_extents(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