Release 4.7 fs/btrfs/ordered-data.h

/*
 * 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 preallocated 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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
chris mason
chris mason
37
82.22%
2
66.67%
miao xie
miao xie
8
17.78%
1
33.33%
Total
45
100.00%
3
100.00%


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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
chris mason
chris mason
29
90.62%
2
50.00%
josef bacik
josef bacik
2
6.25%
1
25.00%
eric paris
eric paris
1
3.12%
1
25.00%
Total
32
100.00%
4
100.00%

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,
			       const u64 range_start, const u64 range_len);
int btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, int nr,
			      const u64 range_start, const u64 range_len);
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
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
chris mason
chris mason
375
52.89%
17
34.69%
josef bacik
josef bacik
150
21.16%
9
18.37%
miao xie
miao xie
83
11.71%
9
18.37%
filipe david borba manana
filipe david borba manana
40
5.64%
4
8.16%
li zefan
li zefan
31
4.37%
1
2.04%
zheng yan
zheng yan
22
3.10%
4
8.16%
jeff mahoney
jeff mahoney
3
0.42%
1
2.04%
qu wenruo
qu wenruo
2
0.28%
1
2.04%
adam buchbinder
adam buchbinder
1
0.14%
1
2.04%
nicholas d steeves
nicholas d steeves
1
0.14%
1
2.04%
eric paris
eric paris
1
0.14%
1
2.04%
Total
709
100.00%
49
100.00%
  
Directory: fs/btrfs

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.