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author | Ingo Molnar <mingo@elte.hu> | 2009-01-10 14:04:41 +0300 |
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committer | Ingo Molnar <mingo@elte.hu> | 2009-01-10 14:04:41 +0300 |
commit | b17304245f0db0ac69b795c411407808f3f2796d (patch) | |
tree | 63ed3915d9295bd08f640bf25c322064ba787fad /fs/btrfs/ordered-data.h | |
parent | 889c92d21db40be0b7d22a59395060237895bb85 (diff) | |
parent | 9a100a4464917b5ffff3a8ce1c2758088fd9bb32 (diff) | |
download | linux-b17304245f0db0ac69b795c411407808f3f2796d.tar.xz |
Merge branch 'linus' into x86/setup-lzma
Conflicts:
init/do_mounts_rd.c
Diffstat (limited to 'fs/btrfs/ordered-data.h')
-rw-r--r-- | fs/btrfs/ordered-data.h | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/fs/btrfs/ordered-data.h b/fs/btrfs/ordered-data.h new file mode 100644 index 000000000000..ab66d5e8d6d6 --- /dev/null +++ b/fs/btrfs/ordered-data.h @@ -0,0 +1,158 @@ +/* + * 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 { + /* bytenr on disk */ + u64 bytenr; + u32 sum; +}; + +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. + */ + 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 */ + +#define BTRFS_ORDERED_NOCOW 2 /* set when we want to write in place */ + +#define BTRFS_ORDERED_COMPRESSED 3 /* writing a compressed extent */ + +#define BTRFS_ORDERED_PREALLOC 4 /* set when writing to prealloced 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; + + /* flags (described above) */ + unsigned long flags; + + /* 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; + + /* 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; +}; + + +/* + * 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) +{ + 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, u64 disk_len, int tyep); +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); +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); +int btrfs_ordered_update_i_size(struct inode *inode, + struct btrfs_ordered_extent *ordered); +int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr, 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); +int btrfs_wait_ordered_extents(struct btrfs_root *root, int nocow_only); +#endif |