213 lines
6.8 KiB
C
213 lines
6.8 KiB
C
/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef __BTRFS_ORDERED_DATA__
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#define __BTRFS_ORDERED_DATA__
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/* one of these per inode */
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struct btrfs_ordered_inode_tree {
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spinlock_t lock;
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struct rb_root tree;
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struct rb_node *last;
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};
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struct btrfs_ordered_sum {
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/* bytenr is the start of this extent on disk */
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u64 bytenr;
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/*
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* this is the length in bytes covered by the sums array below.
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*/
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int len;
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struct list_head list;
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/* last field is a variable length array of csums */
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u32 sums[];
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};
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/*
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* bits for the flags field:
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*
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* BTRFS_ORDERED_IO_DONE is set when all of the blocks are written.
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* It is used to make sure metadata is inserted into the tree only once
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* per extent.
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*
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* BTRFS_ORDERED_COMPLETE is set when the extent is removed from the
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* rbtree, just before waking any waiters. It is used to indicate the
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* IO is done and any metadata is inserted into the tree.
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*/
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#define BTRFS_ORDERED_IO_DONE 0 /* set when all the pages are written */
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#define BTRFS_ORDERED_COMPLETE 1 /* set when removed from the tree */
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#define BTRFS_ORDERED_NOCOW 2 /* set when we want to write in place */
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#define BTRFS_ORDERED_COMPRESSED 3 /* writing a zlib compressed extent */
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#define BTRFS_ORDERED_PREALLOC 4 /* set when writing to prealloced extent */
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#define BTRFS_ORDERED_DIRECT 5 /* set when we're doing DIO with this extent */
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#define BTRFS_ORDERED_IOERR 6 /* We had an io error when writing this out */
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#define BTRFS_ORDERED_UPDATED_ISIZE 7 /* indicates whether this ordered extent
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* has done its due diligence in updating
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* the isize. */
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#define BTRFS_ORDERED_LOGGED_CSUM 8 /* We've logged the csums on this ordered
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ordered extent */
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#define BTRFS_ORDERED_TRUNCATED 9 /* Set when we have to truncate an extent */
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#define BTRFS_ORDERED_LOGGED 10 /* Set when we've waited on this ordered extent
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* in the logging code. */
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struct btrfs_ordered_extent {
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/* logical offset in the file */
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u64 file_offset;
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/* disk byte number */
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u64 start;
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/* ram length of the extent in bytes */
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u64 len;
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/* extent length on disk */
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u64 disk_len;
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/* number of bytes that still need writing */
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u64 bytes_left;
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/* number of bytes that still need csumming */
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u64 csum_bytes_left;
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/*
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* the end of the ordered extent which is behind it but
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* didn't update disk_i_size. Please see the comment of
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* btrfs_ordered_update_i_size();
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*/
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u64 outstanding_isize;
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/*
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* If we get truncated we need to adjust the file extent we enter for
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* this ordered extent so that we do not expose stale data.
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*/
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u64 truncated_len;
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/* flags (described above) */
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unsigned long flags;
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/* compression algorithm */
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int compress_type;
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/* reference count */
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atomic_t refs;
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/* the inode we belong to */
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struct inode *inode;
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/* list of checksums for insertion when the extent io is done */
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struct list_head list;
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/* If we need to wait on this to be done */
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struct list_head log_list;
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/* If the transaction needs to wait on this ordered extent */
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struct list_head trans_list;
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/* used to wait for the BTRFS_ORDERED_COMPLETE bit */
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wait_queue_head_t wait;
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/* our friendly rbtree entry */
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struct rb_node rb_node;
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/* a per root list of all the pending ordered extents */
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struct list_head root_extent_list;
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struct btrfs_work work;
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struct completion completion;
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struct btrfs_work flush_work;
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struct list_head work_list;
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};
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/*
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* calculates the total size you need to allocate for an ordered sum
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* structure spanning 'bytes' in the file
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*/
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static inline int btrfs_ordered_sum_size(struct btrfs_root *root,
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unsigned long bytes)
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{
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int num_sectors = (int)DIV_ROUND_UP(bytes, root->sectorsize);
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return sizeof(struct btrfs_ordered_sum) + num_sectors * sizeof(u32);
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}
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static inline void
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btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t)
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{
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spin_lock_init(&t->lock);
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t->tree = RB_ROOT;
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t->last = NULL;
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}
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void btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry);
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void btrfs_remove_ordered_extent(struct inode *inode,
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struct btrfs_ordered_extent *entry);
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int btrfs_dec_test_ordered_pending(struct inode *inode,
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struct btrfs_ordered_extent **cached,
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u64 file_offset, u64 io_size, int uptodate);
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int btrfs_dec_test_first_ordered_pending(struct inode *inode,
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struct btrfs_ordered_extent **cached,
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u64 *file_offset, u64 io_size,
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int uptodate);
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int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
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u64 start, u64 len, u64 disk_len, int type);
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int btrfs_add_ordered_extent_dio(struct inode *inode, u64 file_offset,
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u64 start, u64 len, u64 disk_len, int type);
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int btrfs_add_ordered_extent_compress(struct inode *inode, u64 file_offset,
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u64 start, u64 len, u64 disk_len,
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int type, int compress_type);
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void btrfs_add_ordered_sum(struct inode *inode,
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struct btrfs_ordered_extent *entry,
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struct btrfs_ordered_sum *sum);
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struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode,
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u64 file_offset);
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void btrfs_start_ordered_extent(struct inode *inode,
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struct btrfs_ordered_extent *entry, int wait);
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int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len);
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struct btrfs_ordered_extent *
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btrfs_lookup_first_ordered_extent(struct inode * inode, u64 file_offset);
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struct btrfs_ordered_extent *btrfs_lookup_ordered_range(struct inode *inode,
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u64 file_offset,
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u64 len);
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int btrfs_ordered_update_i_size(struct inode *inode, u64 offset,
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struct btrfs_ordered_extent *ordered);
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int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr,
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u32 *sum, int len);
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int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr);
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void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, int nr);
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void btrfs_get_logged_extents(struct inode *inode,
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struct list_head *logged_list,
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const loff_t start,
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const loff_t end);
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void btrfs_put_logged_extents(struct list_head *logged_list);
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void btrfs_submit_logged_extents(struct list_head *logged_list,
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struct btrfs_root *log);
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void btrfs_wait_logged_extents(struct btrfs_trans_handle *trans,
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struct btrfs_root *log, u64 transid);
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void btrfs_free_logged_extents(struct btrfs_root *log, u64 transid);
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int __init ordered_data_init(void);
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void ordered_data_exit(void);
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#endif
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