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fs/btrfs/ordered-data.h
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/* * 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__ |
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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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/* * 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 */ |
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struct btrfs_sector_sum { |
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/* bytenr on disk */ u64 bytenr; |
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u32 sum; }; struct btrfs_ordered_sum { |
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/* bytenr is the start of this extent on disk */ u64 bytenr; |
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/* * this is the length in bytes covered by the sums array below. |
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*/ unsigned long len; |
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struct list_head list; |
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/* last field is a variable length array of btrfs_sector_sums */ |
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struct btrfs_sector_sum sums[]; |
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}; |
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/* * 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. */ |
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#define BTRFS_ORDERED_IO_DONE 0 /* set when all the pages are written */ |
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|
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#define BTRFS_ORDERED_COMPLETE 1 /* set when removed from the tree */ |
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|
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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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|
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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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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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|
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/* ram length of the extent in bytes */ |
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u64 len; |
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|
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/* extent length on disk */ u64 disk_len; |
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/* number of bytes that still need writing */ u64 bytes_left; |
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/* flags (described above) */ |
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unsigned long flags; |
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|
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/* compression algorithm */ int compress_type; |
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/* reference count */ |
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atomic_t refs; |
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|
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/* the inode we belong to */ 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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/* 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 */ struct list_head root_extent_list; |
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}; |
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/* * calculates the total size you need to allocate for an ordered sum * structure spanning 'bytes' in the file */ |
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static inline int btrfs_ordered_sum_size(struct btrfs_root *root, unsigned long bytes) |
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{ unsigned long num_sectors = (bytes + root->sectorsize - 1) / root->sectorsize; |
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num_sectors++; |
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return sizeof(struct btrfs_ordered_sum) + num_sectors * sizeof(struct btrfs_sector_sum); } |
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static inline void btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t) { |
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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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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, |
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struct btrfs_ordered_extent **cached, u64 file_offset, u64 io_size); |
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int btrfs_dec_test_first_ordered_pending(struct inode *inode, struct btrfs_ordered_extent **cached, u64 *file_offset, u64 io_size); |
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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); int btrfs_add_ordered_extent_dio(struct inode *inode, u64 file_offset, 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, u64 start, u64 len, u64 disk_len, int type, int compress_type); |
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int btrfs_add_ordered_sum(struct inode *inode, struct btrfs_ordered_extent *entry, struct btrfs_ordered_sum *sum); |
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struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode, u64 file_offset); |
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void btrfs_start_ordered_extent(struct inode *inode, 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 * 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, u64 file_offset, 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, u32 *sum); |
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int btrfs_run_ordered_operations(struct btrfs_root *root, int wait); int btrfs_add_ordered_operation(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct inode *inode); |
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int btrfs_wait_ordered_extents(struct btrfs_root *root, int nocow_only, int delay_iput); |
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#endif |