db/io.h

   1 /*
   2  * Copyright (c) 2000-2001 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32
  33 struct typ;
  34
  35 #define BBMAP_SIZE              (XFS_MAX_BLOCKSIZE / BBSIZE)
  36 typedef struct bbmap {
  37         __int64_t               b[BBMAP_SIZE];
  38 } bbmap_t;
  39
  40 typedef struct iocur {
  41         __int64_t               bb;     /* BB number in filesystem of buf */
  42         int                     blen;   /* length of "buf", bb's */
  43         int                     boff;   /* data - buf */
  44         void                    *buf;   /* base address of buffer */
  45         void                    *data;  /* current interesting data */
  46         xfs_ino_t               dirino; /* current directory inode number */
  47         xfs_ino_t               ino;    /* current inode number */
  48         int                     len;    /* length of "data", bytes */
  49         __uint16_t              mode;   /* current inode's mode */
  50         xfs_off_t               off;    /* fs offset of "data" in bytes */
  51         const struct typ        *typ;   /* type of "data" */
  52         int                     use_bbmap; /* set if bbmap is valid */
  53         bbmap_t                 bbmap;  /* map daddr if fragmented */
  54 } iocur_t;
  55
  56 #define DB_RING_ADD 1                   /* add to ring on set_cur */
  57 #define DB_RING_IGN 0                   /* do not add to ring on set_cur */
  58
  59 extern iocur_t  *iocur_base;            /* base of stack */
  60 extern iocur_t  *iocur_top;             /* top element of stack */
  61 extern int      iocur_sp;               /* current top of stack */
  62 extern int      iocur_len;              /* length of stack array */
  63
  64 extern void     io_init(void);
  65 extern void     off_cur(int off, int len);
  66 extern void     pop_cur(void);
  67 extern void     print_iocur(char *tag, iocur_t *ioc);
  68 extern void     push_cur(void);
  69 extern int      read_bbs(__int64_t daddr, int count, void **bufp,
  70                          bbmap_t *bbmap);
  71 extern int      write_bbs(__int64_t daddr, int count, void *bufp,
  72                           bbmap_t *bbmap);
  73 extern void     write_cur(void);
  74 extern void     set_cur(const struct typ *t, __int64_t d, int c, int ring_add,
  75                         bbmap_t *bbmap);
  76 extern void     ring_add(void);