db/io.h

   1 /*
   2  * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18
  19 struct typ;
  20
  21 #define BBMAP_SIZE              (XFS_MAX_BLOCKSIZE / BBSIZE)
  22 typedef struct bbmap {
  23         __int64_t               b[BBMAP_SIZE];
  24 } bbmap_t;
  25
  26 typedef struct iocur {
  27         __int64_t               bb;     /* BB number in filesystem of buf */
  28         int                     blen;   /* length of "buf", bb's */
  29         int                     boff;   /* data - buf */
  30         void                    *buf;   /* base address of buffer */
  31         void                    *data;  /* current interesting data */
  32         xfs_ino_t               dirino; /* current directory inode number */
  33         xfs_ino_t               ino;    /* current inode number */
  34         int                     len;    /* length of "data", bytes */
  35         __uint16_t              mode;   /* current inode's mode */
  36         xfs_off_t               off;    /* fs offset of "data" in bytes */
  37         const struct typ        *typ;   /* type of "data" */
  38         int                     use_bbmap; /* set if bbmap is valid */
  39         bbmap_t                 bbmap;  /* map daddr if fragmented */
  40 } iocur_t;
  41
  42 #define DB_RING_ADD 1                   /* add to ring on set_cur */
  43 #define DB_RING_IGN 0                   /* do not add to ring on set_cur */
  44
  45 extern iocur_t  *iocur_base;            /* base of stack */
  46 extern iocur_t  *iocur_top;             /* top element of stack */
  47 extern int      iocur_sp;               /* current top of stack */
  48 extern int      iocur_len;              /* length of stack array */
  49
  50 extern void     io_init(void);
  51 extern void     off_cur(int off, int len);
  52 extern void     pop_cur(void);
  53 extern void     print_iocur(char *tag, iocur_t *ioc);
  54 extern void     push_cur(void);
  55 extern int      read_bbs(__int64_t daddr, int count, void **bufp,
  56                          bbmap_t *bbmap);
  57 extern int      write_bbs(__int64_t daddr, int count, void *bufp,
  58                           bbmap_t *bbmap);
  59 extern void     write_cur(void);
  60 extern void     set_cur(const struct typ *t, __int64_t d, int c, int ring_add,
  61                         bbmap_t *bbmap);
  62 extern void     ring_add(void);