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cmsfsany.c
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cmsfsany.c
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/*
*
* Name: cmsfsany.c (C program source)
* CMS FS common routines (any mode: util or driver)
* This is included in cmsfsusa.c and cmsfsvfs.c.
*
* See also: cmsfsusa.c (utility) and cmsfsvfs.c (driver)
*
* This source contains the routines common to both the
* "utility" build of CMS FS and the "driver" build,
* to be included by either "cmsfsvfs.c" or "cmsfsusa.c".
* If there were ever a stand alone mode (neither Linux
* filesystem nor a Unix utility), then these routines
* should be common to that mode also.
*
*/
#include <ctype.h>
#include "aecs.h"
/* ------------------------------------------------------------ CMSFSBEX
* This function was moved to cmsfsusa.c (the utility source).
* FS driver should use kernel header macros for endian conversion.
*/
/* ------------------------------------------------------------ CMSFSX2I
* CMS FS heXadecimal-to-Integer function
* The EDF filesystem uses several "packed decimal" fields.
* (Actually a visual approximation of packed decimal format
* lacking the sign nibble.) This is for converting them to integers.
*/
int cmsfsx2i ( unsigned char *ivalue , int l )
{
int i , ovalue ;
ovalue = (ivalue[0] & 0x0F) + ((ivalue[0]>>4) & 0x0F) * 10;
for (i = 1 ; i < l ; i++)
{
ovalue = ovalue << 8 ;
ovalue += (ivalue[i] & 0x0F) + ((ivalue[i]>>4) & 0x0F) * 10;
}
return ovalue ;
}
/* ---------------------------------------------------- CMSFS_FIND_LABEL
* Look for the CMS volume label structure (ADT).
* If we don't find it, this ain't no CMS EDF filesystem.
* Returns the physical blocksize of the disk on success.
*/
int cmsfs_find_label(struct CMSSUPER *vol,struct CMSFSADT *adt)
{
int i, rc;
static
unsigned char cmsfsflb[4096]; /* known max blocksize */
/* (probably should compute) */
/* char array (4 bytes) "CMS1" filesystem identifier */
unsigned
char cmsfsvsk[8] = CMSFSVSK ;
/* (a "magic number" by any other name) */
/* array of possible CMS FS blocksizes */
int cmsfsbkt[8] = CMSFSBKT ;
#ifdef CMSFS_DEBUG
(void) sprintf((char*)cmsfs_ermsg,
"cmsfs_find_label(0x%08X,0x%08X)",vol,adt);
cmsfs_error(cmsfs_ermsg);
#endif
/*
* FBA DASDs are special. Physical blocsize is always 512
* and the label is at physical offset 512 (second record),
* though the logical blocksize may be 512, 1K, 2K, or 4K.
*/
if (vol->pbksz == 0 || vol->pbksz == 512) {
#ifdef CMSFS_DEBUG
cmsfs_error(
(unsigned char *)
"cmsfs_find_label(): trying FBA ...");
#endif /* CMSFS_DEBUG */
/* read FBA block #1 (second record) */
rc = cmsfs_bread(vol,cmsfsflb,1,512);
if (rc != 512)
{
if (vol->error == 0)
vol->error = CMSFS_EIO; /* I/O error */
return -1;
}
(void) memcpy(adt,cmsfsflb,sizeof(*adt));
/* check for the CMS1 magic at the FBA offset */
if (adt->ADTIDENT[0] == cmsfsvsk[0]
&& adt->ADTIDENT[1] == cmsfsvsk[1]
&& adt->ADTIDENT[2] == cmsfsvsk[2]
&& adt->ADTIDENT[3] == cmsfsvsk[3])
{
int blksz;
/* blksz = cmsfsbex((unsigned char *)adt->ADTDBSIZ,4); */
blksz = be32_to_cpu(*(int*)adt->ADTDBSIZ);
if (blksz != 512)
{
(void) sprintf((char*)cmsfs_ermsg,
"cmsfs_find_label(): FS blksize %d does not match device blksize %d",
blksz,512);
cmsfs_error(cmsfs_ermsg);
}
vol->flags = CMSFSFBA;
vol->blksz = 512;
return vol->blksz;
} }
/* not an FBA volume; try CKD blocksizes */
/*
* CKD DASDs are C/H/S in nature and can have any blocksize
* that the utility or operating system decided to put there.
* OS/390 uses no particular blocksize, referring to tracks
* directly. For CMS CKD volumes, the physical blocksize
* should match logical, unless obscured by the access method.
*/
for (i = 0 ; cmsfsbkt[i] != 0 ; i++)
{
if (vol->pbksz == 0 || vol->pbksz == cmsfsbkt[i]) {
#ifdef CMSFS_DEBUG
(void) sprintf((char*)cmsfs_ermsg,
"cmsfs_find_label(): trying %d blocksize ...",
cmsfsbkt[i]);
cmsfs_error(cmsfs_ermsg);
#endif /* CMSFS_DEBUG */
/* read CKD block #2 (third record) */
rc = cmsfs_bread(vol,cmsfsflb,2,cmsfsbkt[i]);
if (rc != cmsfsbkt[i])
{
if (vol->error == 0)
vol->error = CMSFS_EIO; /* I/O error */
return -1;
}
(void) memcpy(adt,cmsfsflb,sizeof(*adt));
/* check for the CMS1 magic */
if (adt->ADTIDENT[0] == cmsfsvsk[0]
&& adt->ADTIDENT[1] == cmsfsvsk[1]
&& adt->ADTIDENT[2] == cmsfsvsk[2]
&& adt->ADTIDENT[3] == cmsfsvsk[3])
{
int blksz;
/* blksz = cmsfsbex(adt->ADTDBSIZ,4); */
blksz = be32_to_cpu(*(int*)adt->ADTDBSIZ);
if (blksz == cmsfsbkt[i])
{
vol->flags = CMSFSCKD;
vol->blksz = cmsfsbkt[i];
return vol->blksz;
}
(void) sprintf((char*)cmsfs_ermsg,
"cmsfs_find_label(): FS blksize %d does not match device blksize %d",
blksz,cmsfsbkt[i]);
cmsfs_error(cmsfs_ermsg);
} }
}
vol->error = CMSFS_ENOCMS; /* "No medium found" */
return -1; /* not a CMS volume */
}
/*
* The above routine presumes that even an FBA volume will be
* at least 12K. This is technically incorrect: FBA CMS formatting
* can use as little as 8K. But since such a volume would have
* only 1024 bytes for storage, I think this is a small exposure.
*/
/* ------------------------------------------------------- CMSFS_MAP_ADT
* Map an ADT struct into our own CMSSUPER superblock struct.
* CMS flavor superblock struct must be supplied.
* CMS flavor inode struct will be allocated, if this succeeeds.
*/
int cmsfs_map_ADT(struct CMSSUPER *vol)
{
int i, /* a counter */
rc, /* a return code */
bktry; /* a trial blocksize */
/* partial "ADT" structure (per IBM) */
static
struct CMSFSADT cmsvol;
static
unsigned char cmsfsflb[4096]; /* known max blocksize */
/* (probably should compute instead of always using max) */
#ifdef CMSFS_DEBUG
(void) sprintf((char*)cmsfs_ermsg,"cmsfs_map_ADT(0x%08X)",vol);
cmsfs_error(cmsfs_ermsg);
#endif
/* should check that CMSSUPER passed is non-NULL */
/* should perhaps check that vol->inuse == 0 */
/* set this to zero now because it serves as a check later */
vol->blksz = 0;
/* look for the CMS volume label (aka VOLSER) */
rc = cmsfs_find_label(vol,&cmsvol);
/* this also effects a load of the ADT struct to &cmsvol */
/* and sets the blksz member to match the volume found */
/* did we find a CMS1 volume label? */
if (rc <= 0)
{
cmsfs_error(
(unsigned char*)
"cmsfs_map_ADT(): cannot find a CMS1 label");
return -1;
}
/* extract volume label and translate */
for (i = 0 ; i < 6 ; i++) vol->volid[i] = cmsvol.ADTID[i] ;
vol->volid[6] = 0x00;
#ifdef CMSFS_HOST_ASCII
(void) stretoa(vol->volid);
#endif
#ifdef CMSFS_DEBUG
(void) sprintf((char*)cmsfs_ermsg,
"cmsfs_map_ADT(): processing volume '%s'",vol->volid);
cmsfs_error(cmsfs_ermsg);
#endif
/* extract "directory origin pointer" */
/* vol->origin = cmsfsbex(cmsvol.ADTDOP,4); */
vol->origin = be32_to_cpu(*(int*)cmsvol.ADTDOP);
/* extract number of cylinders used */
/* vol->ncyls = cmsfsbex(cmsvol.ADTCYL,4); */
vol->ncyls = be32_to_cpu(*(int*)cmsvol.ADTCYL);
/* extract max number of cylinders */
/* vol->mcyls = cmsfsbex(cmsvol.ADTMCYL,4); */
vol->mcyls = be32_to_cpu(*(int*)cmsvol.ADTMCYL);
/* extract "total blocks on disk" count */
/* vol->blocks = cmsfsbex(cmsvol.ADTNUM,4); */
vol->blocks = be32_to_cpu(*(int*)cmsvol.ADTNUM);
/* compute "blocks used" count */
/* vol->bkused = cmsfsbex(cmsvol.ADTUSED,4); */
vol->bkused = be32_to_cpu(*(int*)cmsvol.ADTUSED);
vol->bkused += 1 ; /* why??? */
/* compute "blocks free" count */
vol->bkfree = vol->blocks - vol->bkused ;
/* compute time (as ctime) when this volume was created */
{
struct cmsfs_tm temptime; /* temporary */
temptime.tm_sec = cmsfsx2i(
(unsigned char *)&cmsvol.ADTDCRED[5],1);
temptime.tm_min = cmsfsx2i(
(unsigned char *)&cmsvol.ADTDCRED[4],1);
temptime.tm_hour = cmsfsx2i(
(unsigned char *)&cmsvol.ADTDCRED[3],1);
temptime.tm_mday = cmsfsx2i(
(unsigned char *)&cmsvol.ADTDCRED[2],1);
temptime.tm_mon = cmsfsx2i(
(unsigned char *)&cmsvol.ADTDCRED[1],1) - 1;
temptime.tm_year = cmsfsx2i(
(unsigned char *)&cmsvol.ADTDCRED[0],1);
if (cmsvol.ADTFLGL[0] & ADTCNTRY)
temptime.tm_year += 100 ;
vol->ctime = cmsfs_mktime(&temptime);
}
/* extract offset to reserved file, if any */
/* vol->resoff = cmsfsbex(cmsvol.ADTOFFST,4); */
vol->resoff = be32_to_cpu(*(int*)cmsvol.ADTOFFST);
/* extract size and number of FSTs */
/* vol->fstsz = cmsfsbex(cmsvol.ADTFSTSZ,4); */
vol->fstsz = be32_to_cpu(*(int*)cmsvol.ADTFSTSZ);
/* vol->fstct = cmsfsbex(cmsvol.ADTNFST,4); */
vol->fstct = be32_to_cpu(*(int*)cmsvol.ADTNFST);
/* initial filetype mapping table is NULL */
vol->cmsfsext = NULL;
/* allocate and map the directory inode from its FST */
vol->cmsrooti = cmsfs_malloc(sizeof(struct CMSINODE));
if (vol->cmsrooti == NULL)
{
cmsfs_error(
(unsigned char *)
"cmsfs_map_ADT(): cannot allocate CMS directory inode");
return -1;
}
/* read in the first FST */
rc = cmsfs_bread(vol,cmsfsflb,vol->origin-1,vol->blksz);
if (rc != vol->blksz)
{
cmsfs_free(vol->cmsrooti);
vol->inuse = 0; /* we just deallocated that inode */
return -1;
}
vol->inuse = 1; /* we just allocated one inode */
/* point dir inode back to the superblock */
vol->cmsrooti->cmssuper = vol;
/* must be set BEFORE calling cmsfs_map_FST() */
/* map the directory ADT into a the root directory inode */
rc = cmsfs_map_FST(vol->cmsrooti,(struct CMSFSFST *)cmsfsflb);
if (rc != 0) {
(void) sprintf((char*)cmsfs_ermsg,
"cmsfs_map_ADT(): cmsfs_map_FST() of the directory returned %d",rc);
cmsfs_error(cmsfs_ermsg);
cmsfs_free(vol->cmsrooti);
vol->inuse = 0; /* we just deallocated that inode */
return rc; }
vol->cmsrooti->flags = CMSFSBIN; /* directory is F 64 binary */
/* (announce if debugging) dir inode is now allocd and mapped */
#ifdef CMSFS_DEBUG
cmsfs_error(
(unsigned char *)
"cmsfs_map_ADT(): CMS dir inode allocated and mapped");
#endif
/* sanity check: FOP in dir entry must match DOP in vol */
/*
if (vol->origin != vol->cmsrooti->origin)
{
unsigned char buff[32];
unsigned char buf2[4096];
(void) sprintf((char*)cmsfs_ermsg,
"cmsfs_map_ADT(): FOP %d (of directory) does not match DOP %d",
vol->cmsrooti->origin,vol->origin);
cmsfs_error(cmsfs_ermsg);
(void) sprintf((char*)cmsfs_ermsg,
"cmsfs_map_ADT(): blocksize %d, levels %d, blocks %d",
vol->blksz,vol->cmsrooti->level,vol->cmsrooti->bloks);
cmsfs_error(cmsfs_ermsg);
(void) lseek(vol->devfd,vol->blksz*(vol->origin-1),SEEK_SET);
(void) read(vol->devfd,buff,32);
(void) cmsfsdmp(buff,32);
(void) lseek(vol->devfd,vol->blksz*(vol->origin-1),SEEK_SET);
(void) read(vol->devfd,buff,32);
(void) cmsfsdmp(buff,32);
cmsfs_error("cmsfs_map_ADT(): Does it look like indirection?");
(void) cmsfsrd2(vol->cmsrooti,buf2,0);
(void) cmsfsdmp(buf2,32);
}
SHOULD RE-CHECK AFTER READING DIRECTORY BLOCKS
*/
/* sanity check: RECFM of a directory must be "F" */
if (vol->cmsrooti->recfm[0] != 'F')
{
(void) sprintf((char*)cmsfs_ermsg,
"cmsfs_map_ADT(): directory RECFM '%s' not 'F'",
vol->cmsrooti->recfm);
cmsfs_error(cmsfs_ermsg);
cmsfs_free(vol->cmsrooti);
vol->inuse = 0; /* we just deallocated that inode */
return -1;
}
/* sanity check: LRECL of a directory must be 64 */
if (vol->cmsrooti->lrecl != 64)
{
(void) sprintf((char*)cmsfs_ermsg,
"cmsfs_map_ADT(): directory LRECL %d not 64",
vol->cmsrooti->lrecl);
cmsfs_error(cmsfs_ermsg);
cmsfs_free(vol->cmsrooti);
vol->inuse = 0; /* we just deallocated that inode */
return -1;
}
vol->files = vol->cmsrooti->items;
/* report */
#ifdef CMSFS_DEBUG
(void) sprintf((char*)cmsfs_ermsg,
"cmsfs_map_ADT(): volume '%s' blocksize %d files %d",
vol->volid,vol->blksz,vol->files);
cmsfs_error(cmsfs_ermsg);
#endif
vol->error = 0; /* no error yet; this is a new superblock */
return 0;
}
/* ------------------------------------------------------- CMSFS_MAP_FST
* Map a CMS FS FST structure to our own CMSINODE "inode" structure.
* Operation is function(target,source).
*/
int cmsfs_map_FST(struct CMSINODE *finode , struct CMSFSFST *cmsfst)
{
int i;
unsigned
char *p, *q, *qq;
#ifdef CMSFS_DEBUG
(void) sprintf((char*)cmsfs_ermsg,
"cmsfs_map_FST(0x%08X,0x%08X)",finode,cmsfst);
cmsfs_error(cmsfs_ermsg);
#endif
/* extract and translate filename */
p = cmsfst->FSTFNAME;
q = finode->name;
qq = finode->fname;
i = 0;
while (*p != 0x40 && *p != 0x00 && i < 8)
{
#ifdef CMSFS_HOST_ASCII
*qq = *q = chretoa(*p);
#else
*qq = *q = *p;
#endif
if (isupper(*q)) *q = tolower(*q); /* LOCASE */
qq++; q++; p++; i++;
}
*q++ = '.';
*qq++ = 0x00;
p = cmsfst->FSTFTYPE;
qq = finode->ftype;
i = 0;
while (*p != 0x40 && *p != 0x00 && i < 8)
{
#ifdef CMSFS_HOST_ASCII
*qq = *q = chretoa(*p);
#else
*qq = *q = *p;
#endif
if (isupper(*q)) *q = tolower(*q); /* LOCASE */
qq++; q++; p++; i++;
}
*q++ = 0x00;
*qq++ = 0x00;
/* extract and translate FMODE */
p = cmsfst->FSTFMODE;
q = finode->fmode;
#ifdef CMSFS_HOST_ASCII
q[0] = chretoa(p[0]); q[1] = chretoa(p[1]);
#else
q[0] = p[0]; q[1] = p[1];
#endif
q[2] = 0x00;
/* extract and translate RECFM */
p = cmsfst->FSTRECFM;
q = finode->recfm;
#ifdef CMSFS_HOST_ASCII
q[0] = chretoa(p[0]);
#else
q[0] = p[0];
#endif
q[1] = 0x00;
/* extract LRECL */
/* finode->lrecl = cmsfsbex(cmsfst->FSTLRECL,4); */
finode->lrecl = be32_to_cpu(*(int*)cmsfst->FSTLRECL);
/* extract "directory origin pointer" */
/* finode->origin = cmsfsbex(cmsfst->FSTFOP,4); */
finode->origin = be32_to_cpu(*(int*)cmsfst->FSTFOP);
/* extract block count */
/* finode->bloks = cmsfsbex(cmsfst->FSTADBC,4); */
finode->bloks = be32_to_cpu(*(int*)cmsfst->FSTADBC);
/* extract item count */
/* finode->items = cmsfsbex(cmsfst->FSTAIC,4); */
finode->items = be32_to_cpu(*(int*)cmsfst->FSTAIC);
/* conditionally report these CMS file attributes */
#ifdef CMSFS_DEBUG
(void) sprintf((char*)cmsfs_ermsg,
"cmsfs_map_FST(): name '%s', mode '%s', recfm '%s', lrecl %d",
finode->name,finode->fmode,finode->recfm,finode->lrecl);
cmsfs_error(cmsfs_ermsg);
#endif
/* extract date and compute time stamp */
{
struct cmsfs_tm temptime; /* temporary */
temptime.tm_year = cmsfsx2i(
(unsigned char *)&cmsfst->FSTADATI[0],1);
if (cmsfst->FSTFLAGS[0] & FSTCNTRY)
temptime.tm_year += 100 ;
temptime.tm_mon = cmsfsx2i(
(unsigned char *)&cmsfst->FSTADATI[1],1) - 1;
temptime.tm_mday = cmsfsx2i(
(unsigned char *)&cmsfst->FSTADATI[2],1);
temptime.tm_hour = cmsfsx2i(
(unsigned char *)&cmsfst->FSTADATI[3],1);
temptime.tm_min = cmsfsx2i(
(unsigned char *)&cmsfst->FSTADATI[4],1);
temptime.tm_sec = cmsfsx2i(
(unsigned char *)&cmsfst->FSTADATI[5],1);
finode->ctime = cmsfs_mktime(&temptime);
}
/* levels of indirection and pointer size */
finode->level = cmsfst->FSTNLVL[0] & 0xFF ;
finode->psize = cmsfst->FSTPTRSZ[0] & 0xFF ;
/* conditionally report these CMS file attributes */
#ifdef CMSFS_DEBUG
(void) sprintf((char*)cmsfs_ermsg,
"cmsfs_map_FST(): FOP %d, blks, %d recs %d, level %d, psize %d",
finode->origin,finode->bloks,finode->items,
finode->level,finode->psize);
cmsfs_error(cmsfs_ermsg);
#endif
/*
cmsfst.FSTDATEW[0],cmsfst.FSTDATEW[1],
cmsfst.FSTTIMEW[0],cmsfst.FSTTIMEW[1],
cmsfst.FSTYEARW[0],cmsfst.FSTYEARW[1]);
!! above may be all zeros; why? CDF leftover?
*/
/*
nrecs = cmsfst.FSTRECCT[0];
nrecs = nrecs << 8 ;
nrecs += cmsfst.FSTRECCT[1];
(void) printf("%d ",nrecs);
!! above may be zero; why?
*/
finode->rdpnt =
finode->rdblk =
finode->rdoff = 0; /* set read pointers to zero */
finode->rdoff2 = 0; /* set read pointers to zero */
finode->rdbuf = NULL; /* no work buffer unless allocd later */
finode->rdbuf2 = NULL; /* no span buffer unless allocd later */
finode->error = 0; /* no error yet; this is a new inode */
finode->bytes = 0; /* don't bother about the size yet */
finode->flags = 0x0000;
return 0;
}
/* ------------------------------------------------------- CMSFS_MAP_EXT
* Map a CMS filetype (sometimes called an "extension").
* The terms "filetype" and "extension" are used interchangably here.
*/
#include "cmsfsext.h"
void cmsfs_map_EXT(struct CMSINODE * fi)
{
int i;
unsigned char *p;
/* sanity check: be sure supplied "inode" pointer is non-NULL */
if (fi == NULL)
{
cmsfs_error(
(unsigned char *)
"cmsfs_map_EXT(): null CMS inode passed");
return;
}
/* sanity check: be sure inode referenced has a superblock */
if (fi->cmssuper == NULL)
{
cmsfs_error(
(unsigned char *)
"cmsfs_map_EXT(): null CMS superblock in CMS inode");
return;
}
/* silently return if this file has any flags already set */
if (fi->flags != 0x0000) return;
/* possibly initialize the superblock's filetype mapping table */
if (fi->cmssuper->cmsfsext == NULL)
{
#ifdef CMSFS_DEBUG
cmsfs_error(
(unsigned char *)
"cmsfs_map_EXT(): initializing filetypes map");
#endif
fi->cmssuper->cmsfsext = cmsfsext;
for (i = 0 ; fi->cmssuper->cmsfsext[i].ftype[0] != ' '
&& fi->cmssuper->cmsfsext[i].ftype[0] != ' ' ; i++)
{
p = fi->cmssuper->cmsfsext[i].ftype;
while (*p != ' ' && *p != 0x00) p++;
if (*p == ' ') *p = 0x00;
}
#ifdef CMSFS_DEBUG
(void) sprintf((char*)cmsfs_ermsg,
"cmsfs_map_EXT(): filetypes map table has %d entries",i);
cmsfs_error(cmsfs_ermsg);
#endif
}
/* step through the known types list, looking for a match */
for (i = 0 ; fi->cmssuper->cmsfsext[i].ftype[0] != ' ' ; i++)
{
if (strncmp(fi->ftype,
fi->cmssuper->cmsfsext[i].ftype,8) == 0x0000)
{
fi->flags = fi->cmssuper->cmsfsext[i].flags;
#ifdef CMSFS_DEBUG
(void) sprintf((char*)cmsfs_ermsg,
"cmsfs_map_EXT(): found filetype '%s'",
fi->cmssuper->cmsfsext[i].ftype);
cmsfs_error(cmsfs_ermsg);
#endif
return;
}
}
/* file is of a type we don't know how to canonicalize */
(void) sprintf((char*)cmsfs_ermsg,
"cmsfs_map_EXT(): filetype '%s' not mapped",fi->ftype);
cmsfs_error(cmsfs_ermsg);
return;
}
/* ------------------------------------------------------------ CMSFSRD2
* "Read Function number Two" -- read a block from a CMS file.
* This is a second attempt. THIS FUNCTION NEEDS A BETTER NAME.
*/
int cmsfsrd2(struct CMSINODE *inode,void *buffer,int block)
{
int ppb, i, j, b1, b2, rc;
unsigned char *bp;
#ifdef CMSFS_DEBUG
(void) sprintf((char*)cmsfs_ermsg,"cmsfsrd2(,,%d): lev %d, fn '%s'",
block,inode->level,inode->name);
cmsfs_error(cmsfs_ermsg);
#endif
/* when no indirection, do a simple read */
if (inode->level == 0)
return
cmsfs_bread(inode->cmssuper,buffer,
inode->origin-1+block,inode->cmssuper->blksz);
/* pointers per block */
if ( inode->psize > 0 ) ppb = inode->cmssuper->blksz / inode->psize ;
else ppb = inode->cmssuper->blksz / 4 ;
/* read first block for indirection */
b1 = block;
for (i = 0 ; i < inode->level ; i++) b1 = b1 / ppb;
rc = cmsfs_bread(inode->cmssuper,buffer,
inode->origin-1+b1,inode->cmssuper->blksz);
if (rc != inode->cmssuper->blksz)
{
(void) sprintf((char*)cmsfs_ermsg,
"cmsfsrd2(): cmsfs_bread(,,%d,%d) returned %d",
inode->origin-1+b1,inode->cmssuper->blksz,rc);
cmsfs_error(cmsfs_ermsg);
return rc;
}
for (j = 1 ; j <= inode->level ; j++)
{
/* read next block for indirection */
b1 = block;
for (i = j ; i < inode->level ; i++) b1 = b1 / ppb;
b1 = b1 % ppb;
bp = buffer;
bp += b1 * inode->psize;
/* b2 = cmsfsbex(bp,4); */
b2 = be32_to_cpu(*(int*)bp);
/* If the block pointer is null this is a block of zeros
* and CMS didn't bother to allocate disk space,
* then return a buffer of zeros.
*/
if (b2 == 0) {
memset(buffer, 0, inode->cmssuper->blksz);
break;
}
/* read next block for indirection */
rc = cmsfs_bread(inode->cmssuper,buffer,
b2-1,inode->cmssuper->blksz);
if (rc != inode->cmssuper->blksz)
{
(void) sprintf((char*)cmsfs_ermsg,
"cmsfsrd2(): cmsfs_bread(,,%d,%d) returned %d",
inode->origin-1+b1,inode->cmssuper->blksz,rc);
cmsfs_error(cmsfs_ermsg);
return rc;
}
}
return inode->cmssuper->blksz;
}
/* -------------------------------------------------------- CMSFS_LOOKUP
* Lookup a file in the CMS directory. Allocates a CMSINODE struct.
* After successful call to this function, the caller might
* possibly set the ->flags member. In kernel mode (VFS),
* the caller should also set the ->vfsinode member.
*/
struct CMSINODE *
cmsfs_lookup(struct CMSINODE * di,unsigned char * fn)
{
struct CMSINODE * cmsinode;
int i, j, k, rc;
unsigned char *p, xmatch[18], umatch[18];
#ifdef CMSFS_DEBUG
(void) sprintf((char*)cmsfs_ermsg,"cmsfs_lookup(,'%s')",fn);
cmsfs_error(cmsfs_ermsg);
#endif
/* first things first: confirm superblock and root inode */
if (di->cmssuper == NULL)
{
cmsfs_error(
(unsigned char *)
"cmsfs_lookup(): missing CMS superblock allocation");
return NULL;
}
if (di->cmssuper->cmsrooti == NULL)
{
cmsfs_error(
(unsigned char *)
"cmsfs_lookup(): missing CMS dir (root) inode allocation");
return NULL;
}
/* gimme another CMS inode structure */
cmsinode = cmsfs_malloc(sizeof(struct CMSINODE));
if (cmsinode == NULL)
{
cmsfs_error(
(unsigned char *)
"cmsfs_lookup(): cannot allocate CMS inode");
return NULL;
}
/* if we're opening the directory as a file, then ... */
if (strncmp(fn,".dir",4) == 0)
{
#ifdef CMSFS_DEBUG
(void) cmsfs_error(
(unsigned char *)
"cmsfs_lookup(): opening directory");
#endif
(void) memcpy(cmsinode,
di->cmssuper->cmsrooti,sizeof(*cmsinode));
cmsinode->index = 0; /* the number of this inode */
di->cmssuper->inuse += 1; /* another inode for this super */
cmsinode->flags = CMSFSBIN; /* F 64 so, yes, binary */
return cmsinode; /* return "success" */
}
/* set stuff up: fill-in the structure for this file */
cmsinode->cmssuper = di->cmssuper;
/* prepare to search: establish upper-case and exact matches */
p = fn; i = 0;
/* first eight bytes (CMS filename) */
while ( i < 8 && *p != '.' && *p != 0x00)
{
#ifdef CMSFS_HOST_ASCII
umatch[i] = xmatch[i] = chratoe(*p);
#else
umatch[i] = xmatch[i] = *p;
#endif
if (0x80 < umatch[i] && umatch[i] < 0xC0) umatch[i] += 0x40;
i++; p++;
}
/* conditionally adjust pointer */
if (*p != 0x00) p++;
/* possibly pad with blanks */
while ( i < 8 )
{
umatch[i] = xmatch[i] = 0x40;
i++;
}
/* second eight bytes (CMS filetype) */
while ( i < 16 && *p != '.' && *p != 0x00)
{
#ifdef CMSFS_HOST_ASCII
umatch[i] = xmatch[i] = chratoe(*p);
#else
umatch[i] = xmatch[i] = *p;
#endif
if (0x80 < umatch[i] && umatch[i] < 0xC0) umatch[i] += 0x40;
i++; p++;
}
/* possibly pad with blanks */
while ( i < 16 )
{
umatch[i] = xmatch[i] = 0x40;
i++;
}
/* terminate with NULL character */
umatch[i] = xmatch[i] = 0x00;
/* find the file */
j = di->cmssuper->fstct;
/* list the files */
for (i = k = 0 ; i < di->cmssuper->files ; i++)
{
unsigned
char *pp;
static unsigned char buff[4096];
if (j >= di->cmssuper->fstct)
{
(void) cmsfsrd2(di->cmssuper->cmsrooti,buff,k);
k += 1; /* increment block counter */
j = 0; /* reset intermediate item counter */
}
pp = &buff[j*di->cmssuper->fstsz];
/* compare */
rc = strncmp(pp,umatch,16);
if (rc == 0) /* found it?? */
{
/* map the inode for the file */
rc = cmsfs_map_FST(cmsinode,(struct CMSFSFST *)pp);
if (rc != 0)
{
cmsfs_error(
(unsigned char *)
"cmsfs_lookup(): cannot map CMS inode (FST)");
cmsfs_free(cmsinode);
di->cmssuper->inuse -= 1;
return NULL;
}
cmsinode->index = i; /* the number of this inode */
di->cmssuper->inuse += 1; /* another inode for super */
cmsinode->flags = 0x0000; /* CALLER MUST APPLY */
return cmsinode; /* return "success" */
}
j += 1; /* increment intermediate item counter */
}
di->cmssuper->error = di->cmssuper->cmsrooti->error = CMSFS_ENOENT;
/* cmsfs_error(
(unsigned char *)
"cmsfs_lookup(): file not found"); */
(void) sprintf((char*)cmsfs_ermsg,
"cmsfs_lookup(): file '%s' not found",fn);
cmsfs_error(cmsfs_ermsg);
cmsfs_free(cmsinode);
/* di->cmssuper->inuse -= 1; */
return NULL;
}
/* ---------------------------------------------------------- CMSFS_READ
* Read a record at the current pointer in the CMS file.
* Simple: read the record, increment the record counter.
*/
ssize_t cmsfs_read(struct CMSINODE * cmsfil,void * recbuf,size_t reclen)
{
int i, l, rc;
unsigned
char *bufi, *bufo;
/* sanity check: file pointer must non-NULL */
if (cmsfil == NULL)
{ cmsfs_error(
(unsigned char *)
"cmsfs_read(): NULL file pointer (inode pointer)");
return -1; }
/* sanity check: superblock pointer must non-NULL */
if (cmsfil->cmssuper == NULL)
{ cmsfs_error(
(unsigned char *)
"cmsfs_read(): NULL volume pointer in file struct");
return -1; }
/* can't read past end of file */
if (cmsfil->rdpnt >= cmsfil->items)
{
/* cmsfil->error = EEOF; *
* cmsfs_error("cmsfs_read(): attempted read past end-of-file"); *
* return -1; ** negative implies error */
return 0; /* zero clearly means "no data available" */
}
/* possibly allocate a work buffer */
if (cmsfil->rdbuf == NULL)
{ cmsfil->rdbuf = cmsfs_malloc(cmsfil->cmssuper->blksz);
if (cmsfil->rdbuf == NULL)
{ cmsfs_error(
(unsigned char *)
"cmsfs_read(): unable to allocate a work buffer");
return -1; }
#ifdef CMSFS_DEBUG
(void) sprintf((char*)cmsfs_ermsg,
"cmsfs_read(): '%s', blk %d, rec %d (#1)",
cmsfil->name,cmsfil->rdblk,cmsfil->rdpnt);
cmsfs_error(cmsfs_ermsg);
#endif
/* now load-up a block into this new buffer */
rc = cmsfsrd2(cmsfil,cmsfil->rdbuf,cmsfil->rdblk);
if (rc != cmsfil->cmssuper->blksz)
{ cmsfs_error(
(unsigned char *)
"cmsfs_read(): could not read block");
return -1; }
cmsfil->rdblk += 1;
cmsfil->rdoff = 0;
}
/* dereference VOID buffers to CHAR buffers */
bufi = cmsfil->rdbuf;
bufo = recbuf;
/* how big is this record? */
switch (cmsfil->recfm[0])
{
case 'F': l = cmsfil->lrecl;
break;
case 'V':
if (cmsfil->rdoff >= cmsfil->cmssuper->blksz)
{
#ifdef CMSFS_DEBUG
(void) sprintf((char*)cmsfs_ermsg,
"cmsfs_read(): '%s', blk %d, rec %d (#2A)",
cmsfil->name,cmsfil->rdblk,cmsfil->rdpnt);
cmsfs_error(cmsfs_ermsg);
#endif
rc = cmsfsrd2(cmsfil,cmsfil->rdbuf,cmsfil->rdblk);
if (rc != cmsfil->cmssuper->blksz)
{ cmsfs_error(
(unsigned char *)
"cmsfs_read(): could not read block");
return -1; }
cmsfil->rdblk += 1;
cmsfil->rdoff = 0;
}
l = bufi[cmsfil->rdoff++] & 0xFF;
if (cmsfil->rdoff >= cmsfil->cmssuper->blksz)
{
#ifdef CMSFS_DEBUG
(void) sprintf((char*)cmsfs_ermsg,
"cmsfs_read(): '%s', blk %d, rec %d (#2B)",
cmsfil->name,cmsfil->rdblk,cmsfil->rdpnt);
cmsfs_error(cmsfs_ermsg);
#endif
rc = cmsfsrd2(cmsfil,cmsfil->rdbuf,cmsfil->rdblk);
if (rc != cmsfil->cmssuper->blksz)
{ cmsfs_error(
(unsigned char *)
"cmsfs_read(): could not read block");
return -1; }
cmsfil->rdblk += 1;
cmsfil->rdoff = 0;
}
l = (l * 256) + (bufi[cmsfil->rdoff++] & 0xFF);
break;
default: /* Bzzzttt!!! */
cmsfs_error(
(unsigned char *)
"cmsfs_read(): RECFM not 'F' or 'V'");
return -1;
}
if (l > reclen)
{
(void) sprintf((char*)cmsfs_ermsg,
"cmsfs_read(): record (%d) is longer than buffer (%d)",
l,reclen);
cmsfs_error(cmsfs_ermsg);
/* ADDED FOR DIAGNOSTICS */
(void) sprintf((char*)cmsfs_ermsg,
"cmsfs_read(): %s %s LRECL=%d RECFM=%s RECS=%d SIZE=%d",
cmsfil->fname,cmsfil->ftype,cmsfil->lrecl,cmsfil->recfm,
cmsfil->items,cmsfil->bytes);
cmsfs_error(cmsfs_ermsg);
return -1;
}
/* copy bytes from work buffer to caller's buffer */
for (i = 0; i < l; i++)
{
if (cmsfil->rdoff >= cmsfil->cmssuper->blksz)
{
#ifdef CMSFS_DEBUG