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cckdutil.c
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cckdutil.c
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/* CCKDUTIL.C (c) Copyright Greg Smith, 2000-2009 */
/* Compressed CKD Common routines */
/*-------------------------------------------------------------------*/
/* This module contains functions for compressed CKD devices */
/* used by more than 1 main program. */
/*-------------------------------------------------------------------*/
#include "hstdinc.h"
#define _CCKDUTIL_C_
#define _HDASD_DLL_
#include "hercules.h"
#include "opcode.h"
/*-------------------------------------------------------------------*/
typedef struct _SPCTAB { /* Space table */
BYTE typ; /* Type of space */
int val; /* Value for space */
U32 pos; /* Space offset */
U32 len; /* Space length */
U32 siz; /* Space size */
} SPCTAB;
#define SPCTAB_NONE 0 /* Ignore this space entry */
#define SPCTAB_DEVHDR 1 /* Space is device header */
#define SPCTAB_CDEVHDR 2 /* Space is compressed hdr */
#define SPCTAB_L1 3 /* Space is level 1 table */
#define SPCTAB_L2 4 /* Space is level 2 table */
#define SPCTAB_TRK 5 /* Space is track image */
#define SPCTAB_BLKGRP 6 /* Space is blkgrp image */
#define SPCTAB_FREE 7 /* Space is free block */
#define SPCTAB_EOF 8 /* Space is end-of-file */
/*-------------------------------------------------------------------*/
/* Internal functions */
/*-------------------------------------------------------------------*/
static int comp_spctab_sort(const void *a, const void *b);
static int cdsk_spctab_sort(const void *a, const void *b);
static int cdsk_build_free_space(SPCTAB *spctab, int s);
static int cdsk_valid_trk (int trk, BYTE *buf, int heads, int len);
/*-------------------------------------------------------------------*/
/* Static data areas */
/*-------------------------------------------------------------------*/
static BYTE eighthexFF[] = {0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff};
static char *spaces[] = { "none", "devhdr", "cdevhdr", "l1", "l2",
"trk", "blkgrp", "free", "eof" };
static char *comps[] = { "none", "zlib", "bzip2" };
/*-------------------------------------------------------------------*/
/* Change the endianess of a compressed file */
/*-------------------------------------------------------------------*/
DLL_EXPORT int cckd_swapend (DEVBLK *dev)
{
CCKDDASD_EXT *cckd; /* -> cckd extension */
int fd; /* File descriptor */
int rc; /* Return code */
struct stat fst; /* File status buffer */
int i; /* Index */
int swapend; /* 1=swap space */
int len; /* Length */
off_t off, lopos, hipos; /* File offsets */
CCKD_DEVHDR cdevhdr; /* Compressed ckd header */
CCKD_L1ENT *l1 = NULL; /* Level 1 table */
CCKD_L2ENT l2[256]; /* Level 2 table */
CCKD_FREEBLK freeblk; /* Free block */
/* Get fd */
cckd = dev->cckd_ext;
if (cckd == NULL)
fd = dev->fd;
else
fd = cckd->fd[cckd->sfn];
/* Get file size */
if (fstat (fd, &fst) < 0)
goto cswp_fstat_error;
hipos = fst.st_size;
/* Device header */
off = CCKD_DEVHDR_POS;
if (lseek (fd, off, SEEK_SET) < 0)
goto cswp_lseek_error;
len = CCKD_DEVHDR_SIZE;
if ((rc = read (fd, &cdevhdr, len)) != len)
goto cswp_read_error;
swapend = (cdevhdr.options & CCKD_BIGENDIAN) != cckd_endian();
cckd_swapend_chdr (&cdevhdr);
cdevhdr.options |= CCKD_ORDWR;
if (lseek (fd, off, SEEK_SET) < 0)
goto cswp_lseek_error;
if ((rc = write (fd, &cdevhdr, len)) != len)
goto cswp_write_error;
if (!swapend) cckd_swapend_chdr (&cdevhdr);
/* l1 table */
len = cdevhdr.numl1tab * CCKD_L1ENT_SIZE;
if ((l1 = malloc (len)) == NULL)
goto cswp_malloc_error;
off = CCKD_L1TAB_POS;
if (lseek (fd, off, SEEK_SET) < 0)
goto cswp_lseek_error;
if ((rc = read (fd, l1, len)) != len)
goto cswp_read_error;
cckd_swapend_l1 (l1, (int)cdevhdr.numl1tab);
if (lseek (fd, off, SEEK_SET) < 0)
goto cswp_lseek_error;
if ((rc = write (fd, l1, len)) != len)
goto cswp_write_error;
if (!swapend) cckd_swapend_l1 (l1, (int)cdevhdr.numl1tab);
lopos = CCKD_L1TAB_POS + len;
/* l2 tables */
for (i = 0; i < cdevhdr.numl1tab; i++)
{
if (l1[i] == 0 || l1[i] == 0xffffffff
|| l1[i] < lopos || l1[i] > hipos - CCKD_L2TAB_SIZE)
continue;
off = (off_t)l1[i];
if (lseek (fd, off, SEEK_SET) < 0)
goto cswp_lseek_error;
len = CCKD_L2TAB_SIZE;
if ((rc = read (fd, l2, len)) != len)
goto cswp_read_error;
cckd_swapend_l2 (l2);
if (lseek (fd, off, SEEK_SET) < 0)
goto cswp_lseek_error;
if ((rc = write (fd, l2, len)) != len)
goto cswp_write_error;
}
free (l1);
l1 = NULL;
/* free space */
if (cdevhdr.free && cdevhdr.free >= lopos
&& cdevhdr.free <= hipos - CCKD_FREEBLK_SIZE)
{
off = (off_t)cdevhdr.free;
if (lseek (fd, off, SEEK_SET) < 0)
goto cswp_lseek_error;
len = CCKD_FREEBLK_SIZE;
if ((rc = read (fd, &freeblk, len)) != len)
goto cswp_read_error;
if (memcmp(&freeblk, "FREE_BLK", 8) == 0)
{
/* New format free space */
for (i = 0; i < cdevhdr.free_number; i++)
{
off += CCKD_FREEBLK_SIZE;
if (off > hipos - CCKD_FREEBLK_SIZE)
break;
if (lseek (fd, off, SEEK_SET) < 0)
goto cswp_lseek_error;
if ((rc = read (fd, &freeblk, len)) != len)
goto cswp_read_error;
cckd_swapend_free (&freeblk);
if (lseek (fd, off, SEEK_SET) < 0)
goto cswp_lseek_error;
if ((rc = write (fd, &freeblk, len)) != len)
goto cswp_write_error;
} /* for each free space */
} /* if new format free space */
else
{
/* Old format free space */
for (i = 0; i < cdevhdr.free_number; i++)
{
if (off < lopos || off > hipos - CCKD_FREEBLK_SIZE)
break;
if (lseek (fd, off, SEEK_SET) < 0)
goto cswp_lseek_error;
if ((rc = read (fd, &freeblk, len)) != len)
goto cswp_read_error;
cckd_swapend_free (&freeblk);
if (lseek (fd, off, SEEK_SET) < 0)
goto cswp_lseek_error;
if ((rc = write (fd, &freeblk, len)) != len)
goto cswp_write_error;
if (!swapend) cckd_swapend_free (&freeblk);
off = (off_t)freeblk.pos;
} /* for each free space */
} /* else old format free space */
} /* if free space */
return 0;
/* error exits */
cswp_fstat_error:
cckdumsg (dev, 701, "fstat error: %s\n", strerror(errno));
goto cswp_error;
cswp_lseek_error:
cckdumsg (dev, 702, "lseek error, offset 0x%" I64_FMT "x: %s\n",
(long long)off, strerror(errno));
goto cswp_error;
cswp_read_error:
cckdumsg (dev, 703, "read error rc=%d, offset 0x%" I64_FMT "x len %d: %s\n",
rc, (long long)off, len, rc < 0 ? strerror(errno) : "incomplete");
goto cswp_error;
cswp_write_error:
cckdumsg (dev, 704, "write error rc=%d, offset 0x%" I64_FMT "x len %d: %s\n",
rc, (long long)off, len, rc < 0 ? strerror(errno) : "incomplete");
goto cswp_error;
cswp_malloc_error:
cckdumsg (dev, 705, "malloc error, size %d: %s\n",
len, strerror(errno));
goto cswp_error;
cswp_error:
if (l1) free(l1);
return -1;
}
/*-------------------------------------------------------------------*/
/* Swap endian - compressed device header */
/*-------------------------------------------------------------------*/
DLL_EXPORT void cckd_swapend_chdr (CCKD_DEVHDR *cdevhdr)
{
/* fix the compressed ckd header */
cdevhdr->options ^= CCKD_BIGENDIAN;
cckd_swapend4 ((char *) &cdevhdr->numl1tab);
cckd_swapend4 ((char *) &cdevhdr->numl2tab);
cckd_swapend4 ((char *) &cdevhdr->size);
cckd_swapend4 ((char *) &cdevhdr->used);
cckd_swapend4 ((char *) &cdevhdr->free);
cckd_swapend4 ((char *) &cdevhdr->free_total);
cckd_swapend4 ((char *) &cdevhdr->free_largest);
cckd_swapend4 ((char *) &cdevhdr->free_number);
cckd_swapend4 ((char *) &cdevhdr->free_imbed);
cckd_swapend2 ((char *) &cdevhdr->compress_parm);
}
/*-------------------------------------------------------------------*/
/* Swap endian - level 1 table */
/*-------------------------------------------------------------------*/
DLL_EXPORT void cckd_swapend_l1 (CCKD_L1ENT *l1, int n)
{
int i; /* Index */
for (i = 0; i < n; i++)
cckd_swapend4 ((char *) &l1[i]);
}
/*-------------------------------------------------------------------*/
/* Swap endian - level 2 table */
/*-------------------------------------------------------------------*/
DLL_EXPORT void cckd_swapend_l2 (CCKD_L2ENT *l2)
{
int i; /* Index */
for (i = 0; i < 256; i++)
{
cckd_swapend4 ((char *) &l2[i].pos);
cckd_swapend2 ((char *) &l2[i].len);
cckd_swapend2 ((char *) &l2[i].size);
}
}
/*-------------------------------------------------------------------*/
/* Swap endian - free space entry */
/*-------------------------------------------------------------------*/
DLL_EXPORT void cckd_swapend_free (CCKD_FREEBLK *fb)
{
cckd_swapend4 ((char *) &fb->pos);
cckd_swapend4 ((char *) &fb->len);
}
/*-------------------------------------------------------------------*/
/* Swap endian - 4 bytes */
/*-------------------------------------------------------------------*/
DLL_EXPORT void cckd_swapend4 (char *c)
{
char temp[4];
memcpy (&temp, c, 4);
c[0] = temp[3];
c[1] = temp[2];
c[2] = temp[1];
c[3] = temp[0];
}
/*-------------------------------------------------------------------*/
/* Swap endian - 2 bytes */
/*-------------------------------------------------------------------*/
DLL_EXPORT void cckd_swapend2 (char *c)
{
char temp[2];
memcpy (&temp, c, 2);
c[0] = temp[1];
c[1] = temp[0];
}
/*-------------------------------------------------------------------*/
/* Are we little or big endian? From Harbison&Steele. */
/*-------------------------------------------------------------------*/
DLL_EXPORT int cckd_endian()
{
union
{
long l;
char c[sizeof (long)];
} u;
u.l = 1;
return u.c[sizeof (long) - 1] == 1 ? CCKD_BIGENDIAN : 0;
}
/*-------------------------------------------------------------------
* Remove all free space from a compressed ckd file
*-------------------------------------------------------------------*/
DLL_EXPORT int cckd_comp (DEVBLK *dev)
{
CCKDDASD_EXT *cckd; /* -> cckd extension */
int fd; /* File descriptor */
struct stat fst; /* File status buffer */
long long maxsize; /* Max cckd file size */
int rc; /* Return code */
off_t off; /* File offset */
off_t l2area; /* Boundary for l2 tables */
int len; /* Length */
int i, j, l, n; /* Work variables */
int relocate = 0; /* 1=spaces will be relocated*/
int l1size; /* l1 table size */
U32 next; /* offset of next space */
int s; /* space table index */
CKDDASD_DEVHDR devhdr; /* CKD device header */
CCKD_DEVHDR cdevhdr; /* CCKD device header */
CCKD_L1ENT *l1=NULL; /* -> l1 table */
CCKD_L2ENT **l2=NULL; /* -> l2 table array */
SPCTAB *spctab=NULL; /* -> space table */
BYTE *rbuf=NULL; /* Relocation buffer */
BYTE *p; /* -> relocation buffer */
int rlen=0; /* Relocation buffer length */
CCKD_L2ENT zero_l2[256]; /* Empty l2 table (zeros) */
CCKD_L2ENT ff_l2[256]; /* Empty l2 table (0xff's) */
BYTE buf[65536*4]; /* Buffer */
/*---------------------------------------------------------------
* Get fd
*---------------------------------------------------------------*/
cckd = dev->cckd_ext;
if (cckd == NULL)
fd = dev->fd;
else
fd = cckd->fd[cckd->sfn];
/*---------------------------------------------------------------
* Get file statistics
*---------------------------------------------------------------*/
if (fstat (fd, &fst) < 0)
goto comp_fstat_error;
maxsize = sizeof(off_t) == 4 ? 0x7fffffffll : 0xffffffffll;
/*---------------------------------------------------------------
* Read device header
*---------------------------------------------------------------*/
off = 0;
if (lseek (fd, off, SEEK_SET) < 0)
goto comp_lseek_error;
len = CKDDASD_DEVHDR_SIZE;
if ((rc = read (fd, &devhdr, len)) != len)
goto comp_read_error;
if (memcmp (devhdr.devid, "CKD_C370", 8) != 0
&& memcmp (devhdr.devid, "CKD_S370", 8) != 0
&& memcmp (devhdr.devid, "FBA_C370", 8) != 0
&& memcmp (devhdr.devid, "FBA_S370", 8) != 0)
{
cckdumsg (dev, 999, "not a compressed dasd file\n");
goto comp_error;
}
comp_restart:
/*---------------------------------------------------------------
* Read compressed device header
*---------------------------------------------------------------*/
off = CCKD_DEVHDR_POS;
if (lseek (fd, off, SEEK_SET) < 0)
goto comp_lseek_error;
len = CCKD_DEVHDR_SIZE;
if ((rc = read (fd, &cdevhdr, len)) != len)
goto comp_read_error;
/*---------------------------------------------------------------
* Check the endianess of the file
*---------------------------------------------------------------*/
if ((cdevhdr.options & CCKD_BIGENDIAN) != cckd_endian())
{
cckdumsg (dev, 101, "converting to %s\n",
cckd_endian() ? "big-endian" : "little-endian");
if (cckd_swapend (dev) < 0)
goto comp_error;
else
goto comp_restart;
}
/*---------------------------------------------------------------
* Some header checks
*---------------------------------------------------------------*/
if ((off_t)cdevhdr.size != fst.st_size
|| cdevhdr.size != cdevhdr.used || cdevhdr.free != 0
|| cdevhdr.free_total != 0 || cdevhdr.free_largest != 0
|| cdevhdr.free_number != 0 || cdevhdr.free_imbed != 0)
relocate = 1;
/*---------------------------------------------------------------
* Build empty l2 tables
*---------------------------------------------------------------*/
memset (&zero_l2, 0, CCKD_L2TAB_SIZE);
if (cdevhdr.nullfmt != 0)
for (i = 0; i < 256; i++)
zero_l2[i].len = zero_l2[i].size = cdevhdr.nullfmt;
memset (&ff_l2, 0xff, CCKD_L2TAB_SIZE);
/*---------------------------------------------------------------
* Read the l1 table
*---------------------------------------------------------------*/
l1size = len = cdevhdr.numl1tab * CCKD_L1ENT_SIZE;
if ((l1 = malloc (len)) == NULL)
goto comp_malloc_error;
off = CCKD_L1TAB_POS;
if (lseek (fd, off, SEEK_SET) < 0)
goto comp_lseek_error;
if ((rc = read (fd, l1, len)) != len)
goto comp_read_error;
/*---------------------------------------------------------------
* Build the space table
*---------------------------------------------------------------*/
n = 1 + 1 + 1 + cdevhdr.numl1tab + 1;
for (i = 0; i < cdevhdr.numl1tab; i++)
if (l1[i] != 0 && l1[i] != 0xffffffff)
n += 256;
len = sizeof(SPCTAB);
if ((spctab = calloc (n, len)) == NULL)
goto comp_calloc_error;
s = 0;
spctab[s].typ = SPCTAB_DEVHDR;
spctab[s].val = -1;
spctab[s].pos = 0;
spctab[s].len =
spctab[s].siz = CKDDASD_DEVHDR_SIZE;
s++;
spctab[s].typ = SPCTAB_CDEVHDR;
spctab[s].val = -1;
spctab[s].pos = CCKD_DEVHDR_POS;
spctab[s].len =
spctab[s].siz = CCKD_DEVHDR_SIZE;
s++;
spctab[s].typ = SPCTAB_L1;
spctab[s].val = -1;
spctab[s].pos = CCKD_L1TAB_POS;
spctab[s].len =
spctab[s].siz = l1size;
s++;
spctab[s].typ = SPCTAB_EOF;
spctab[s].val = -1;
spctab[s].pos = fst.st_size;
spctab[s].len =
spctab[s].siz = 0;
s++;
for (i = 0; i < cdevhdr.numl1tab; i++)
if (l1[i] != 0 && l1[i] != 0xffffffff)
{
spctab[s].typ = SPCTAB_L2;
spctab[s].val = i;
spctab[s].pos = l1[i];
spctab[s].len =
spctab[s].siz = CCKD_L2TAB_SIZE;
s++;
}
qsort (spctab, s, sizeof(SPCTAB), comp_spctab_sort);
/*---------------------------------------------------------------
* Read level 2 tables
*---------------------------------------------------------------*/
n = cdevhdr.numl1tab;
len = sizeof (void *);
if ((l2 = calloc (n, len)) == NULL)
goto comp_calloc_error;
for (i = 0; spctab[i].typ != SPCTAB_EOF; i++)
{
if (spctab[i].typ != SPCTAB_L2) continue;
l = spctab[i].val;
len = CCKD_L2TAB_SIZE;
if ((l2[l] = malloc (len)) == NULL)
goto comp_malloc_error;
off = (off_t)spctab[i].pos;
if (lseek (fd, off, SEEK_SET) < 0)
goto comp_lseek_error;
if ((rc = read (fd, l2[l], len)) != len)
goto comp_read_error;
for (j = 0; j < 256; j++)
{
if (l2[l][j].pos == 0 || l2[l][j].pos == 0xffffffff)
continue;
spctab[s].typ = SPCTAB_TRK;
spctab[s].val = spctab[i].val*256 + j;
spctab[s].pos = l2[l][j].pos;
spctab[s].len = l2[l][j].len;
spctab[s].siz = l2[l][j].size;
s++;
} /* for each l2 entry */
/* check if empty l2 table */
if (memcmp (l2[l], &zero_l2, CCKD_L2TAB_SIZE) == 0
|| memcmp (l2[l], &ff_l2, CCKD_L2TAB_SIZE) == 0)
{
l1[l] = l2[l][0].pos; /* 0x00000000 or 0xffffffff */
spctab[i].typ = SPCTAB_NONE;
free (l2[l]);
l2[l] = NULL;
relocate = 1;
}
} /* for each space */
qsort (spctab, s, sizeof(SPCTAB), comp_spctab_sort);
while (spctab[s-1].typ == SPCTAB_NONE) s--;
/* set relocate flag if last space is free space */
if (spctab[s-2].pos + spctab[s-2].len != spctab[s-1].pos)
relocate = 1;
/*---------------------------------------------------------------
* relocate l2 tables in order
*---------------------------------------------------------------*/
/* determine l2 area */
l2area = CCKD_L1TAB_POS + l1size;
for (i = 0; i < cdevhdr.numl1tab; i++)
{
if (l1[i] == 0 || l1[i] == 0xffffffff) continue;
if (l1[i] != l2area)
relocate = 1;
l2area += CCKD_L2TAB_SIZE;
}
/* quick return if all l2 tables are orderered and no free space */
if (!relocate)
{
for (i = 1; spctab[i].typ != SPCTAB_EOF; i++)
if (spctab[i-1].pos + spctab[i-1].len != spctab[i].pos)
break;
if (spctab[i].typ == SPCTAB_EOF)
{
cckdumsg (dev, 103, "file already compressed\n");
goto comp_return_ok;
}
}
/* file will be updated */
cdevhdr.options |= CCKD_ORDWR;
/* calculate track size within the l2 area */
for (i = rlen = 0; spctab[i].pos < l2area; i++)
if (spctab[i].typ == SPCTAB_TRK)
rlen += sizeof(spctab[i].val) + sizeof(spctab[i].len)
+ spctab[i].len;
/* read any tracks in the l2area into rbuf */
if ((len = rlen) > 0)
{
if ((rbuf = malloc (len)) == NULL)
goto comp_malloc_error;
for (i = 0, p = rbuf; spctab[i].pos < l2area; i++)
{
if (spctab[i].typ != SPCTAB_TRK) continue;
memcpy (p, &spctab[i].val, sizeof(spctab[i].val));
p += sizeof(spctab[i].val);
memcpy (p, &spctab[i].len, sizeof(spctab[i].len));
p += sizeof(spctab[i].len);
off = (off_t)spctab[i].pos;
if (lseek (fd, off, SEEK_SET) < 0)
goto comp_lseek_error;
len = spctab[i].len;
if ((rc = read (fd, p, len)) != len)
goto comp_read_error;
p += len;
spctab[i].typ = SPCTAB_NONE;
} /* for each space in the l2 area */
qsort (spctab, s, sizeof(SPCTAB), comp_spctab_sort);
while (spctab[s-1].typ == SPCTAB_NONE) s--;
} /* if any tracks to relocate */
/* remove all l2 tables from the space table */
for (i = 0; spctab[i].typ != SPCTAB_EOF; i++)
if (spctab[i].typ == SPCTAB_L2)
spctab[i].typ = SPCTAB_NONE;
qsort (spctab, s, sizeof(SPCTAB), comp_spctab_sort);
while (spctab[s-1].typ == SPCTAB_NONE) s--;
/* add all l2 tables at their ordered offsets */
off = CCKD_L1TAB_POS + l1size;
for (i = 0; i < cdevhdr.numl1tab; i++)
{
if (l1[i] == 0 || l1[i] == 0xffffffff) continue;
spctab[s].typ = SPCTAB_L2;
spctab[s].val = i;
spctab[s].pos = (U32)off;
spctab[s].len =
spctab[s].siz = CCKD_L2TAB_SIZE;
s++;
off += CCKD_L2TAB_SIZE;
}
qsort (spctab, s, sizeof(SPCTAB), comp_spctab_sort);
/* set end-of-file position */
spctab[s-1].pos = spctab[s-2].pos + spctab[s-2].len;
/*---------------------------------------------------------------
* Perform compression
*---------------------------------------------------------------*/
/* move spaces left */
for (i = 0; spctab[i].typ != SPCTAB_EOF; i++)
{
/* ignore contiguous spaces */
if (spctab[i].pos + spctab[i].len == spctab[i+1].pos)
continue;
/* found a gap */
off = (off_t)spctab[i+1].pos;
/* figure out how much we can read */
for (len = 0, j = i + 1; spctab[j].typ != SPCTAB_EOF; j++)
{
if (len + spctab[j].len > sizeof(buf))
break;
next = spctab[j].pos + spctab[j].len;
spctab[j].pos = spctab[i].pos + spctab[i].len + len;
spctab[j].siz = spctab[j].len;
len += spctab[j].len;
if (next != spctab[j+1].pos)
break;
} /* search for contiguous spaces */
/* this can happen if the next space is end-of-file */
if (len == 0)
continue;
/* read the image(s) to be relocated */
if (lseek (fd, off, SEEK_SET) < 0)
goto comp_lseek_error;
if ((rc = read (fd, buf, len)) != len)
goto comp_write_error;
/* write the images */
off = (off_t)spctab[i].pos + spctab[i].len;
if (lseek (fd, off, SEEK_SET) < 0)
goto comp_lseek_error;
if ((rc = write (fd, buf, len)) != len)
goto comp_write_error;
}
/* adjust the size of the file */
spctab[s-1].pos = spctab[s-2].pos + spctab[s-2].len;
/*---------------------------------------------------------------
* Write spaces relocated from the l2area to the end of the file
*---------------------------------------------------------------*/
off = (off_t)spctab[s-1].pos;
p = rbuf;
while (rlen)
{
spctab[s].typ = SPCTAB_TRK;
spctab[s].pos = (U32)off;
memcpy (&spctab[s].val, p, sizeof(spctab[s].val));
p += sizeof(spctab[s].val);
memcpy (&spctab[s].len, p, sizeof(spctab[s].len));
spctab[s].siz = spctab[s].len;
p += sizeof(spctab[s].len);
if (lseek (fd, off, SEEK_SET) < 0)
goto comp_lseek_error;
len = spctab[s].len;
if ((rc = write (fd, p, len)) != len)
goto comp_write_error;
p += len;
off += len;
rlen -= len + sizeof(spctab[s].val) + sizeof(spctab[s].len);
s++;
} /* for each relocated space in l2area */
/* adjust the space table */
if (rbuf)
{
free (rbuf); rbuf = NULL;
qsort (spctab, s, sizeof(SPCTAB), comp_spctab_sort);
spctab[s-1].pos = spctab[s-2].pos + spctab[s-2].len;
}
/*---------------------------------------------------------------
* Update the device header
*---------------------------------------------------------------*/
cdevhdr.size =
cdevhdr.used = spctab[s-1].pos;
cdevhdr.free =
cdevhdr.free_total =
cdevhdr.free_largest =
cdevhdr.free_number =
cdevhdr.free_imbed = 0;
cdevhdr.vrm[0] = CCKD_VERSION;
cdevhdr.vrm[1] = CCKD_RELEASE;
cdevhdr.vrm[2] = CCKD_MODLVL;
/*---------------------------------------------------------------
* Update the lookup tables
*---------------------------------------------------------------*/
for (i = 0; spctab[i].typ != SPCTAB_EOF; i++)
if (spctab[i].typ == SPCTAB_L2)
l1[spctab[i].val] = spctab[i].pos;
else if (spctab[i].typ == SPCTAB_TRK)
{
l = spctab[i].val / 256;
j = spctab[i].val % 256;
l2[l][j].pos = spctab[i].pos;
l2[l][j].len =
l2[l][j].size = spctab[i].len;
}
/*---------------------------------------------------------------
* Write the cdevhdr, l1 table and l2 tables
*---------------------------------------------------------------*/
/* write cdevhdr */
off = CCKD_DEVHDR_POS;
if (lseek (fd, off, SEEK_SET) < 0)
goto comp_lseek_error;
len = CCKD_DEVHDR_SIZE;
if ((rc = write (fd, &cdevhdr, len)) != len)
goto comp_write_error;
/* write l1 table */
off = CCKD_L1TAB_POS;
if (lseek (fd, off, SEEK_SET) < 0)
goto comp_lseek_error;
len = l1size;
if ((rc = write (fd, l1, len)) != len)
goto comp_write_error;
/* write l2 tables */
for (i = 0; i < cdevhdr.numl1tab; i++)
if (l1[i] != 0 && l1[i] != 0xffffffff)
{
off = (off_t)l1[i];
if (lseek (fd, off, SEEK_SET) < 0)
goto comp_lseek_error;
len = CCKD_L2TAB_SIZE;
if ((rc = write (fd, l2[i], len)) != len)
goto comp_lseek_error;
}
/* truncate the file */
off = (off_t)spctab[s-1].pos;
if (off < fst.st_size)
{
ftruncate (fd, off);
cckdumsg (dev, 102, "compress successful, %lld bytes released\n",
(long long)fst.st_size - off);
}
else
cckdumsg (dev, 102, "compress successful, L2 tables relocated\n");
/*---------------------------------------------------------------
* Return
*---------------------------------------------------------------*/
comp_return_ok:
rc = 0;
comp_return:
if (rbuf) free(rbuf);
if (l2)
{
for (i = 0; i < cdevhdr.numl1tab; i++)
if (l2[i])
free (l2[i]);
free (l2);
}
if (l1) free (l1);
if (spctab) free (spctab);
return rc;
/*---------------------------------------------------------------
* Error exits
*---------------------------------------------------------------*/
comp_fstat_error:
cckdumsg (dev, 701, "fstat error: %s\n",
strerror(errno));
goto comp_error;
comp_lseek_error:
cckdumsg (dev, 702, "lseek error, offset 0x%" I64_FMT "x: %s\n",
(long long)off, strerror(errno));
goto comp_error;
comp_read_error:
cckdumsg (dev, 703, "read error rc=%d, offset 0x%" I64_FMT "x len %d: %s\n",
rc, (long long)off, len, rc < 0 ? strerror(errno) : "incomplete");
goto comp_error;
comp_write_error:
cckdumsg (dev, 704, "write error rc=%d, offset 0x%" I64_FMT "x len %d: %s\n",
rc, (long long)off, len, rc < 0 ? strerror(errno) : "incomplete");
goto comp_error;
comp_malloc_error:
cckdumsg (dev, 705, "malloc error, size %d: %s\n",
len, strerror(errno));
goto comp_error;
comp_calloc_error:
cckdumsg (dev, 706, "calloc error, size %d: %s\n",
n*len, strerror(errno));
goto comp_error;
comp_error:
rc = -1;
goto comp_return;
} /* cckd_comp() */
/*-------------------------------------------------------------------
* cckd_comp() space table sort
*-------------------------------------------------------------------*/
static int comp_spctab_sort(const void *a, const void *b)
{
const SPCTAB *x = a, *y = b;
if (x->typ == SPCTAB_NONE) return 1;
else if (y->typ == SPCTAB_NONE) return -1;
else if (x->typ == SPCTAB_EOF) return 1;
else if (y->typ == SPCTAB_EOF) return -1;
else if (x->pos < y->pos) return -1;
else return 1;
}
/*-------------------------------------------------------------------
* Perform check function on a compressed ckd file
*
* check levels
* -1 devhdr, cdevhdr, l1 table
* 0 devhdr, cdevhdr, l1 table, l2 tables
* 1 devhdr, cdevhdr, l1 table, l2 tables, free spaces
* 2 devhdr, cdevhdr, l1 table, l2 tables, free spaces, trkhdrs
* 3 devhdr, cdevhdr, l1 table, l2 tables, free spaces, trkimgs
* 4 devhdr, cdevhdr. Build everything else from recovery
*-------------------------------------------------------------------*/
DLL_EXPORT int cckd_chkdsk(DEVBLK *dev, int level)
{
CCKDDASD_EXT *cckd; /* -> ckd extension */
int fd; /* file descriptor */
struct stat fst; /* file status information */
int fdflags; /* file descriptor flags */
long long maxsize; /* max cckd file size */
int ro; /* 1=file opened read-only */
int f, i, j, l, n; /* work integers */
int l1x, l2x; /* l1, l2 table indexes */
BYTE compmask[256]; /* compression byte mask
00 - supported
0x - valid, not supported
ff - invalid */
off_t off; /* file offset */
int len; /* length to read */
int rc; /* function return code */
int comp; /* trkhdr compression byte[0]*/
int cyl; /* trkhdr cyl bytes[1-2]*/
int head; /* trkhdr head bytes[3-4]*/
int trk; /* trkhdr calculated trk */
int cyls; /* number cylinders */
int heads; /* number heads/cylinder */
int trks; /* number tracks */
unsigned int trksz; /* track size */
int blks; /* number fba blocks */
int blkgrp; /* current block group nbr */
int blkgrps; /* number fba block groups */
unsigned int blkgrpsz; /* fba block group size */
int trktyp; /* track type (TRK, BLKGRP) */
int ckddasd=0; /* 1=ckd */
int fbadasd=0; /* 1= fba */
int shadow=0; /* 0xff=shadow file */
int hdrerr=0; /* non-zero: header errors */
int fsperr=0; /* 1=rebuild free space */
int comperrs=0; /* 1=unsupported comp found */
int recovery=0; /* 1=perform track recovery */
int valid; /* 1=valid trk recovered */
int l1size; /* size of l1 table */
int swapend=0; /* 1=call cckd_swapend */
U32 lopos, hipos; /* low/high file positions */
int pass; /* recovery pass number (fba)*/
int s; /* space table index */
SPCTAB *spctab=NULL; /* -> space table */
BYTE *l2errs=NULL; /* l2 error table */
BYTE *rcvtab=NULL; /* recovered tracks */
CKDDASD_DEVHDR devhdr; /* device header */
CCKD_DEVHDR cdevhdr; /* compressed device header */
CCKD_DEVHDR cdevhdr2; /* compressed device header 2*/
CCKD_L1ENT *l1=NULL; /* -> level 1 table */
CCKD_L2ENT l2ent; /* level 2 entry */
CCKD_L2ENT l2tab[256]; /* level 2 table */
CCKD_L2ENT **l2=NULL; /* -> level 2 table array */
CCKD_L2ENT empty_l2[256]; /* Empty l2 table */
CCKD_FREEBLK freeblk; /* free block */
CCKD_FREEBLK *fsp=NULL; /* free blocks (new format) */
BYTE buf[4*65536]; /* buffer */
/* Get fd */
cckd = dev->cckd_ext;
if (cckd == NULL)
fd = dev->fd;
else
fd = cckd->fd[cckd->sfn];
/* Get some file information */
if ( fstat (fd, &fst) < 0 )
goto cdsk_fstat_error;
hipos = fst.st_size;
maxsize = sizeof(off_t) == 4 ? 0x7fffffffll : 0xffffffffll;
fdflags = get_file_accmode_flags(fd);
ro = (fdflags & O_RDWR) == 0;
/* Build table for compression byte test */
memset (compmask, 0xff, 256);
compmask[0] = 0;
#if defined(HAVE_LIBZ)
compmask[CCKD_COMPRESS_ZLIB] = 0;
#else
compmask[CCKD_COMPRESS_ZLIB] = 1;
#endif
#if defined(CCKD_BZIP2)
compmask[CCKD_COMPRESS_BZIP2] = 0;
#else
compmask[CCKD_COMPRESS_BZIP2] = 2;
#endif
/*---------------------------------------------------------------
* Header checks
*---------------------------------------------------------------*/
/* Read the device header */
off = 0;
if ( lseek (fd, off, SEEK_SET) < 0)
goto cdsk_lseek_error;
len = CKDDASD_DEVHDR_SIZE;
if ((rc = read (fd, &devhdr, len)) != len)
goto cdsk_read_error;
/* Device header checks */
if (memcmp(devhdr.devid, "CKD_C370", 8) == 0
|| memcmp(devhdr.devid, "CKD_S370", 8) == 0
)
ckddasd = 1;
else if (memcmp(devhdr.devid, "FBA_C370", 8) == 0
|| memcmp(devhdr.devid, "FBA_S370", 8) == 0
)
fbadasd = 1;
else
{
cckdumsg (dev, 999, "not a compressed dasd file\n");
goto cdsk_error;
}
if (memcmp(devhdr.devid, "CKD_S370", 8) == 0
|| memcmp(devhdr.devid, "FBA_S370", 8) == 0
)
shadow = 0xff;
trktyp = ckddasd ? SPCTAB_TRK : SPCTAB_BLKGRP;
/* Read the cckd device header */
off = CCKD_DEVHDR_POS;
if ( lseek (fd, off, SEEK_SET) < 0)
goto cdsk_lseek_error;
len = CCKD_DEVHDR_SIZE;
if ((rc = read (fd, &cdevhdr, len)) != len)
goto cdsk_read_error;