db/io.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6
   7 struct typ;
   8
   9 #define BBMAP_SIZE              (XFS_MAX_BLOCKSIZE / BBSIZE)
  10 typedef struct bbmap {
  11         int                     nmaps;
  12         struct xfs_buf_map      b[BBMAP_SIZE];
  13 } bbmap_t;
  14
  15 typedef struct iocur {
  16         int64_t                 bb;     /* BB number in filesystem of buf */
  17         int                     blen;   /* length of "buf", bb's */
  18         int                     boff;   /* data - buf */
  19         void                    *buf;   /* base address of buffer */
  20         void                    *data;  /* current interesting data */
  21         xfs_ino_t               dirino; /* current directory inode number */
  22         xfs_ino_t               ino;    /* current inode number */
  23         int                     len;    /* length of "data", bytes */
  24         uint16_t                mode;   /* current inode's mode */
  25         xfs_off_t               off;    /* fs offset of "data" in bytes */
  26         const struct typ        *typ;   /* type of "data" */
  27         bbmap_t                 *bbmap; /* map daddr if fragmented */
  28         struct xfs_buf          *bp;    /* underlying buffer */
  29         bool                    ino_crc_ok;
  30         bool                    ino_buf;
  31         bool                    dquot_buf;
  32         bool                    need_crc;
  33 } iocur_t;
  34
  35 #define DB_RING_ADD 1                   /* add to ring on set_cur */
  36 #define DB_RING_IGN 0                   /* do not add to ring on set_cur */
  37
  38 extern iocur_t  *iocur_base;            /* base of stack */
  39 extern iocur_t  *iocur_top;             /* top element of stack */
  40 extern int      iocur_sp;               /* current top of stack */
  41 extern int      iocur_len;              /* length of stack array */
  42
  43 extern void     io_init(void);
  44 extern void     off_cur(int off, int len);
  45 extern void     pop_cur(void);
  46 extern void     print_iocur(char *tag, iocur_t *ioc);
  47 extern void     push_cur(void);
  48 extern void     push_cur_and_set_type(void);
  49 extern int      read_buf(int64_t daddr, int count, void *bufp);
  50 extern void     write_cur(void);
  51 extern void     set_cur(const struct typ *type, xfs_daddr_t blknum,
  52                         int len, int ring_add, bbmap_t *bbmap);
  53 extern void     ring_add(void);
  54 extern void     set_iocur_type(const struct typ *type);
  55 extern void     xfs_dummy_verify(struct xfs_buf *bp);
  56 extern void     xfs_verify_recalc_crc(struct xfs_buf *bp);
  57
  58 /*
  59  * returns -1 for unchecked, 0 for bad and 1 for good
  60  */
  61 static inline int
  62 iocur_crc_valid(void)
  63 {
  64         if (!iocur_top->bp)
  65                 return -1;
  66         if (iocur_top->bp->b_flags & LIBXFS_B_UNCHECKED)
  67                 return -1;
  68         return (iocur_top->bp->b_error != -EFSBADCRC &&
  69                 (!iocur_top->ino_buf || iocur_top->ino_crc_ok));
  70 }