LCOV - code coverage report
Current view: top level - fs/btrfs - ordered-data.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 5 0.0 %
Date: 2014-02-18 Functions: 0 0 -
Branches: 0 0 -

           Branch data     Line data    Source code
       1                 :            : /*
       2                 :            :  * Copyright (C) 2007 Oracle.  All rights reserved.
       3                 :            :  *
       4                 :            :  * This program is free software; you can redistribute it and/or
       5                 :            :  * modify it under the terms of the GNU General Public
       6                 :            :  * License v2 as published by the Free Software Foundation.
       7                 :            :  *
       8                 :            :  * This program is distributed in the hope that it will be useful,
       9                 :            :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      10                 :            :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      11                 :            :  * General Public License for more details.
      12                 :            :  *
      13                 :            :  * You should have received a copy of the GNU General Public
      14                 :            :  * License along with this program; if not, write to the
      15                 :            :  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
      16                 :            :  * Boston, MA 021110-1307, USA.
      17                 :            :  */
      18                 :            : 
      19                 :            : #ifndef __BTRFS_ORDERED_DATA__
      20                 :            : #define __BTRFS_ORDERED_DATA__
      21                 :            : 
      22                 :            : /* one of these per inode */
      23                 :            : struct btrfs_ordered_inode_tree {
      24                 :            :         spinlock_t lock;
      25                 :            :         struct rb_root tree;
      26                 :            :         struct rb_node *last;
      27                 :            : };
      28                 :            : 
      29                 :            : struct btrfs_ordered_sum {
      30                 :            :         /* bytenr is the start of this extent on disk */
      31                 :            :         u64 bytenr;
      32                 :            : 
      33                 :            :         /*
      34                 :            :          * this is the length in bytes covered by the sums array below.
      35                 :            :          */
      36                 :            :         int len;
      37                 :            :         struct list_head list;
      38                 :            :         /* last field is a variable length array of csums */
      39                 :            :         u32 sums[];
      40                 :            : };
      41                 :            : 
      42                 :            : /*
      43                 :            :  * bits for the flags field:
      44                 :            :  *
      45                 :            :  * BTRFS_ORDERED_IO_DONE is set when all of the blocks are written.
      46                 :            :  * It is used to make sure metadata is inserted into the tree only once
      47                 :            :  * per extent.
      48                 :            :  *
      49                 :            :  * BTRFS_ORDERED_COMPLETE is set when the extent is removed from the
      50                 :            :  * rbtree, just before waking any waiters.  It is used to indicate the
      51                 :            :  * IO is done and any metadata is inserted into the tree.
      52                 :            :  */
      53                 :            : #define BTRFS_ORDERED_IO_DONE 0 /* set when all the pages are written */
      54                 :            : 
      55                 :            : #define BTRFS_ORDERED_COMPLETE 1 /* set when removed from the tree */
      56                 :            : 
      57                 :            : #define BTRFS_ORDERED_NOCOW 2 /* set when we want to write in place */
      58                 :            : 
      59                 :            : #define BTRFS_ORDERED_COMPRESSED 3 /* writing a zlib compressed extent */
      60                 :            : 
      61                 :            : #define BTRFS_ORDERED_PREALLOC 4 /* set when writing to prealloced extent */
      62                 :            : 
      63                 :            : #define BTRFS_ORDERED_DIRECT 5 /* set when we're doing DIO with this extent */
      64                 :            : 
      65                 :            : #define BTRFS_ORDERED_IOERR 6 /* We had an io error when writing this out */
      66                 :            : 
      67                 :            : #define BTRFS_ORDERED_UPDATED_ISIZE 7 /* indicates whether this ordered extent
      68                 :            :                                        * has done its due diligence in updating
      69                 :            :                                        * the isize. */
      70                 :            : #define BTRFS_ORDERED_LOGGED_CSUM 8 /* We've logged the csums on this ordered
      71                 :            :                                        ordered extent */
      72                 :            : #define BTRFS_ORDERED_TRUNCATED 9 /* Set when we have to truncate an extent */
      73                 :            : 
      74                 :            : struct btrfs_ordered_extent {
      75                 :            :         /* logical offset in the file */
      76                 :            :         u64 file_offset;
      77                 :            : 
      78                 :            :         /* disk byte number */
      79                 :            :         u64 start;
      80                 :            : 
      81                 :            :         /* ram length of the extent in bytes */
      82                 :            :         u64 len;
      83                 :            : 
      84                 :            :         /* extent length on disk */
      85                 :            :         u64 disk_len;
      86                 :            : 
      87                 :            :         /* number of bytes that still need writing */
      88                 :            :         u64 bytes_left;
      89                 :            : 
      90                 :            :         /* number of bytes that still need csumming */
      91                 :            :         u64 csum_bytes_left;
      92                 :            : 
      93                 :            :         /*
      94                 :            :          * the end of the ordered extent which is behind it but
      95                 :            :          * didn't update disk_i_size. Please see the comment of
      96                 :            :          * btrfs_ordered_update_i_size();
      97                 :            :          */
      98                 :            :         u64 outstanding_isize;
      99                 :            : 
     100                 :            :         /*
     101                 :            :          * If we get truncated we need to adjust the file extent we enter for
     102                 :            :          * this ordered extent so that we do not expose stale data.
     103                 :            :          */
     104                 :            :         u64 truncated_len;
     105                 :            : 
     106                 :            :         /* flags (described above) */
     107                 :            :         unsigned long flags;
     108                 :            : 
     109                 :            :         /* compression algorithm */
     110                 :            :         int compress_type;
     111                 :            : 
     112                 :            :         /* reference count */
     113                 :            :         atomic_t refs;
     114                 :            : 
     115                 :            :         /* the inode we belong to */
     116                 :            :         struct inode *inode;
     117                 :            : 
     118                 :            :         /* list of checksums for insertion when the extent io is done */
     119                 :            :         struct list_head list;
     120                 :            : 
     121                 :            :         /* If we need to wait on this to be done */
     122                 :            :         struct list_head log_list;
     123                 :            : 
     124                 :            :         /* used to wait for the BTRFS_ORDERED_COMPLETE bit */
     125                 :            :         wait_queue_head_t wait;
     126                 :            : 
     127                 :            :         /* our friendly rbtree entry */
     128                 :            :         struct rb_node rb_node;
     129                 :            : 
     130                 :            :         /* a per root list of all the pending ordered extents */
     131                 :            :         struct list_head root_extent_list;
     132                 :            : 
     133                 :            :         struct btrfs_work work;
     134                 :            : 
     135                 :            :         struct completion completion;
     136                 :            :         struct btrfs_work flush_work;
     137                 :            :         struct list_head work_list;
     138                 :            : };
     139                 :            : 
     140                 :            : /*
     141                 :            :  * calculates the total size you need to allocate for an ordered sum
     142                 :            :  * structure spanning 'bytes' in the file
     143                 :            :  */
     144                 :            : static inline int btrfs_ordered_sum_size(struct btrfs_root *root,
     145                 :            :                                          unsigned long bytes)
     146                 :            : {
     147                 :          0 :         int num_sectors = (int)DIV_ROUND_UP(bytes, root->sectorsize);
     148                 :          0 :         return sizeof(struct btrfs_ordered_sum) + num_sectors * sizeof(u32);
     149                 :            : }
     150                 :            : 
     151                 :            : static inline void
     152                 :            : btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t)
     153                 :            : {
     154                 :          0 :         spin_lock_init(&t->lock);
     155                 :          0 :         t->tree = RB_ROOT;
     156                 :          0 :         t->last = NULL;
     157                 :            : }
     158                 :            : 
     159                 :            : void btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry);
     160                 :            : void btrfs_remove_ordered_extent(struct inode *inode,
     161                 :            :                                 struct btrfs_ordered_extent *entry);
     162                 :            : int btrfs_dec_test_ordered_pending(struct inode *inode,
     163                 :            :                                    struct btrfs_ordered_extent **cached,
     164                 :            :                                    u64 file_offset, u64 io_size, int uptodate);
     165                 :            : int btrfs_dec_test_first_ordered_pending(struct inode *inode,
     166                 :            :                                    struct btrfs_ordered_extent **cached,
     167                 :            :                                    u64 *file_offset, u64 io_size,
     168                 :            :                                    int uptodate);
     169                 :            : int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
     170                 :            :                              u64 start, u64 len, u64 disk_len, int type);
     171                 :            : int btrfs_add_ordered_extent_dio(struct inode *inode, u64 file_offset,
     172                 :            :                                  u64 start, u64 len, u64 disk_len, int type);
     173                 :            : int btrfs_add_ordered_extent_compress(struct inode *inode, u64 file_offset,
     174                 :            :                                       u64 start, u64 len, u64 disk_len,
     175                 :            :                                       int type, int compress_type);
     176                 :            : void btrfs_add_ordered_sum(struct inode *inode,
     177                 :            :                            struct btrfs_ordered_extent *entry,
     178                 :            :                            struct btrfs_ordered_sum *sum);
     179                 :            : struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode,
     180                 :            :                                                          u64 file_offset);
     181                 :            : void btrfs_start_ordered_extent(struct inode *inode,
     182                 :            :                                 struct btrfs_ordered_extent *entry, int wait);
     183                 :            : int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len);
     184                 :            : struct btrfs_ordered_extent *
     185                 :            : btrfs_lookup_first_ordered_extent(struct inode * inode, u64 file_offset);
     186                 :            : struct btrfs_ordered_extent *btrfs_lookup_ordered_range(struct inode *inode,
     187                 :            :                                                         u64 file_offset,
     188                 :            :                                                         u64 len);
     189                 :            : int btrfs_ordered_update_i_size(struct inode *inode, u64 offset,
     190                 :            :                                 struct btrfs_ordered_extent *ordered);
     191                 :            : int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr,
     192                 :            :                            u32 *sum, int len);
     193                 :            : int btrfs_run_ordered_operations(struct btrfs_trans_handle *trans,
     194                 :            :                                  struct btrfs_root *root, int wait);
     195                 :            : void btrfs_add_ordered_operation(struct btrfs_trans_handle *trans,
     196                 :            :                                  struct btrfs_root *root,
     197                 :            :                                  struct inode *inode);
     198                 :            : int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr);
     199                 :            : void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, int nr);
     200                 :            : void btrfs_get_logged_extents(struct btrfs_root *log, struct inode *inode);
     201                 :            : void btrfs_wait_logged_extents(struct btrfs_root *log, u64 transid);
     202                 :            : void btrfs_free_logged_extents(struct btrfs_root *log, u64 transid);
     203                 :            : int __init ordered_data_init(void);
     204                 :            : void ordered_data_exit(void);
     205                 :            : #endif

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