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Diffstat (limited to 'kernel/fs/btrfs/ordered-data.h')
| -rw-r--r-- | kernel/fs/btrfs/ordered-data.h | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/kernel/fs/btrfs/ordered-data.h b/kernel/fs/btrfs/ordered-data.h new file mode 100644 index 000000000..e96cd4ccd --- /dev/null +++ b/kernel/fs/btrfs/ordered-data.h @@ -0,0 +1,212 @@ +/* + * 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 prealloced 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. */ +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; + + /* number of bytes that still need csumming */ + u64 csum_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); +} + +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; +} + +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); +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); +void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, int nr); +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 |