forked from Minki/linux
140 lines
4.3 KiB
C
140 lines
4.3 KiB
C
/*
|
|
* 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 {
|
|
struct mutex mutex;
|
|
struct rb_root tree;
|
|
struct rb_node *last;
|
|
};
|
|
|
|
/*
|
|
* these are used to collect checksums done just before bios submission.
|
|
* They are attached via a list into the ordered extent, and
|
|
* checksum items are inserted into the tree after all the blocks in
|
|
* the ordered extent are on disk
|
|
*/
|
|
struct btrfs_sector_sum {
|
|
u64 offset;
|
|
u32 sum;
|
|
};
|
|
|
|
struct btrfs_ordered_sum {
|
|
u64 file_offset;
|
|
/*
|
|
* this is the length in bytes covered by the sums array below.
|
|
* But, the sums array may not be contiguous in the file.
|
|
*/
|
|
unsigned long len;
|
|
struct list_head list;
|
|
/* last field is a variable length array of btrfs_sector_sums */
|
|
struct btrfs_sector_sum 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 */
|
|
|
|
struct btrfs_ordered_extent {
|
|
/* logical offset in the file */
|
|
u64 file_offset;
|
|
|
|
/* disk byte number */
|
|
u64 start;
|
|
|
|
/* length of the extent in bytes */
|
|
u64 len;
|
|
|
|
/* flags (described above) */
|
|
unsigned long flags;
|
|
|
|
/* reference count */
|
|
atomic_t refs;
|
|
|
|
/* list of checksums for insertion when the extent io is done */
|
|
struct list_head list;
|
|
|
|
/* used to wait for the BTRFS_ORDERED_COMPLETE bit */
|
|
wait_queue_head_t wait;
|
|
|
|
/* our friendly rbtree entry */
|
|
struct rb_node rb_node;
|
|
};
|
|
|
|
|
|
/*
|
|
* 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, u64 bytes)
|
|
{
|
|
unsigned long num_sectors = (bytes + root->sectorsize - 1) /
|
|
root->sectorsize;
|
|
num_sectors++;
|
|
return sizeof(struct btrfs_ordered_sum) +
|
|
num_sectors * sizeof(struct btrfs_sector_sum);
|
|
}
|
|
|
|
static inline void
|
|
btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t)
|
|
{
|
|
mutex_init(&t->mutex);
|
|
t->tree.rb_node = NULL;
|
|
t->last = NULL;
|
|
}
|
|
|
|
int btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry);
|
|
int btrfs_remove_ordered_extent(struct inode *inode,
|
|
struct btrfs_ordered_extent *entry);
|
|
int btrfs_dec_test_ordered_pending(struct inode *inode,
|
|
u64 file_offset, u64 io_size);
|
|
int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
|
|
u64 start, u64 len);
|
|
int 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);
|
|
void 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);
|
|
int btrfs_ordered_update_i_size(struct inode *inode,
|
|
struct btrfs_ordered_extent *ordered);
|
|
int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u32 *sum);
|
|
int btrfs_wait_on_page_writeback_range(struct address_space *mapping,
|
|
pgoff_t start, pgoff_t end);
|
|
int btrfs_fdatawrite_range(struct address_space *mapping, loff_t start,
|
|
loff_t end, int sync_mode);
|
|
#endif
|