forked from mtalexander/hercules-390
/
cckddasd.c
5970 lines (5118 loc) · 202 KB
/
cckddasd.c
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/* CCKDDASD.C (c) Copyright Roger Bowler, 1999-2012 */
/* (c) Copyright Greg Smith, 2002-2012 */
/* */
/* ESA/390 Compressed CKD Direct Access Storage Device Handler */
/* */
/* Released under "The Q Public License Version 1" */
/* (http://www.hercules-390.org/herclic.html) as modifications to */
/* Hercules. */
/*-------------------------------------------------------------------*/
/* This module contains device functions for compressed emulated */
/* count-key-data direct access storage devices. */
/*-------------------------------------------------------------------*/
#include "hstdinc.h"
#define _CCKDDASD_C_
#define _HDASD_DLL_
#include "hercules.h"
#include "devtype.h"
#include "opcode.h"
/*-------------------------------------------------------------------*/
/* Internal functions */
/*-------------------------------------------------------------------*/
int cckddasd_init(int argc, BYTE *argv[]);
int cckddasd_term();
int cckddasd_init_handler( DEVBLK *dev, int argc, char *argv[] );
int cckddasd_close_device(DEVBLK *dev);
void cckddasd_start(DEVBLK *dev);
void cckddasd_end(DEVBLK *dev);
int cckd_open (DEVBLK *dev, int sfx, int flags, mode_t mode);
int cckd_close (DEVBLK *dev, int sfx);
int cckd_read (DEVBLK *dev, int sfx, off_t off, void *buf, unsigned int len);
int cckd_write (DEVBLK *dev, int sfx, off_t off, void *buf, unsigned int len);
int cckd_ftruncate(DEVBLK *dev, int sfx, off_t off);
void *cckd_malloc(DEVBLK *dev, char *id, size_t size);
void *cckd_calloc(DEVBLK *dev, char *id, size_t n, size_t size);
void *cckd_free(DEVBLK *dev, char *id,void *p);
int cckd_read_track(DEVBLK *dev, int trk, BYTE *unitstat);
int cckd_update_track(DEVBLK *dev, int trk, int off,
BYTE *buf, int len, BYTE *unitstat);
int cckd_used(DEVBLK *dev);
int cfba_read_block(DEVBLK *dev, int blkgrp, BYTE *unitstat);
int cfba_write_block(DEVBLK *dev, int blkgrp, int off,
BYTE *buf, int wrlen, BYTE *unitstat);
int cfba_used(DEVBLK *dev);
int cckd_read_trk(DEVBLK *dev, int trk, int ra, BYTE *unitstat);
void cckd_readahead(DEVBLK *dev, int trk);
int cckd_readahead_scan(int *answer, int ix, int i, void *data);
void* cckd_ra(void* arg);
void cckd_flush_cache(DEVBLK *dev);
int cckd_flush_cache_scan(int *answer, int ix, int i, void *data);
void cckd_flush_cache_all();
void cckd_purge_cache(DEVBLK *dev);
int cckd_purge_cache_scan(int *answer, int ix, int i, void *data);
void* cckd_writer(void *arg);
int cckd_writer_scan(int *o, int ix, int i, void *data);
off_t cckd_get_space(DEVBLK *dev, int *size, int flags);
void cckd_rel_space(DEVBLK *dev, off_t pos, int len, int size);
void cckd_flush_space(DEVBLK *dev);
int cckd_read_chdr(DEVBLK *dev);
int cckd_write_chdr(DEVBLK *dev);
int cckd_read_l1(DEVBLK *dev);
int cckd_write_l1(DEVBLK *dev);
int cckd_write_l1ent(DEVBLK *dev, int l1x);
int cckd_read_init(DEVBLK *dev);
int cckd_read_fsp(DEVBLK *dev);
int cckd_write_fsp(DEVBLK *dev);
int cckd_read_l2(DEVBLK *dev, int sfx, int l1x);
void cckd_purge_l2(DEVBLK *dev);
int cckd_purge_l2_scan(int *answer, int ix, int i, void *data);
int cckd_steal_l2();
int cckd_steal_l2_scan(int *answer, int ix, int i, void *data);
int cckd_write_l2(DEVBLK *dev);
int cckd_read_l2ent(DEVBLK *dev, CCKD_L2ENT *l2, int trk);
int cckd_write_l2ent(DEVBLK *dev, CCKD_L2ENT *l2, int trk);
int cckd_read_trkimg(DEVBLK *dev, BYTE *buf, int trk, BYTE *unitstat);
int cckd_write_trkimg(DEVBLK *dev, BYTE *buf, int len, int trk, int flags);
int cckd_harden(DEVBLK *dev);
int cckd_trklen(DEVBLK *dev, BYTE *buf);
int cckd_null_trk(DEVBLK *dev, BYTE *buf, int trk, int nullfmt);
int cckd_check_null_trk (DEVBLK *dev, BYTE *buf, int trk, int len);
int cckd_cchh(DEVBLK *dev, BYTE *buf, int trk);
int cckd_validate(DEVBLK *dev, BYTE *buf, int trk, int len);
char *cckd_sf_name(DEVBLK *dev, int sfx);
int cckd_sf_init(DEVBLK *dev);
int cckd_sf_new(DEVBLK *dev);
DLL_EXPORT void *cckd_sf_add(void *data);
DLL_EXPORT void *cckd_sf_remove(void *data);
DLL_EXPORT void *cckd_sf_comp(void *data);
DLL_EXPORT void *cckd_sf_chk(void *data);
DLL_EXPORT void *cckd_sf_stats(void *data);
#ifdef OPTION_SYNCIO
int cckd_disable_syncio(DEVBLK *dev);
#endif // OPTION_SYNCIO
void cckd_lock_devchain(int flag);
void cckd_unlock_devchain();
void* cckd_gcol(void* arg);
int cckd_gc_percolate(DEVBLK *dev, unsigned int size);
int cckd_gc_l2(DEVBLK *dev, BYTE *buf);
DEVBLK *cckd_find_device_by_devnum (U16 devnum);
BYTE *cckd_uncompress(DEVBLK *dev, BYTE *from, int len, int maxlen, int trk);
int cckd_uncompress_zlib(DEVBLK *dev, BYTE *to, BYTE *from, int len, int maxlen);
int cckd_uncompress_bzip2(DEVBLK *dev, BYTE *to, BYTE *from, int len, int maxlen);
int cckd_compress(DEVBLK *dev, BYTE **to, BYTE *from, int len, int comp, int parm);
int cckd_compress_none(DEVBLK *dev, BYTE **to, BYTE *from, int len, int parm);
int cckd_compress_zlib(DEVBLK *dev, BYTE **to, BYTE *from, int len, int parm);
int cckd_compress_bzip2(DEVBLK *dev, BYTE **to, BYTE *from, int len, int parm);
void cckd_command_help();
void cckd_command_opts();
void cckd_command_stats();
void cckd_command_debug();
int cckd_command(char *op, int cmd);
DLL_EXPORT void cckd_print_itrace();
void cckd_trace(DEVBLK *dev, char *msg, ...);
/*-------------------------------------------------------------------*/
/* Definitions for sense data format codes and message codes */
/*-------------------------------------------------------------------*/
#define FORMAT_0 0 /* Program or System Checks */
#define FORMAT_1 1 /* Device Equipment Checks */
#define FORMAT_2 2 /* 3990 Equipment Checks */
#define FORMAT_3 3 /* 3990 Control Checks */
#define FORMAT_4 4 /* Data Checks */
#define FORMAT_5 5 /* Data Check + Displacement */
#define FORMAT_6 6 /* Usage Stats/Overrun Errors*/
#define FORMAT_7 7 /* Device Control Checks */
#define FORMAT_8 8 /* Device Equipment Checks */
#define FORMAT_9 9 /* Device Rd/Wrt/Seek Checks */
#define FORMAT_F 15 /* Cache Storage Checks */
#define MESSAGE_0 0 /* Message 0 */
#define MESSAGE_1 1 /* Message 1 */
#define MESSAGE_2 2 /* Message 2 */
#define MESSAGE_3 3 /* Message 3 */
#define MESSAGE_4 4 /* Message 4 */
#define MESSAGE_5 5 /* Message 5 */
#define MESSAGE_6 6 /* Message 6 */
#define MESSAGE_7 7 /* Message 7 */
#define MESSAGE_8 8 /* Message 8 */
#define MESSAGE_9 9 /* Message 9 */
#define MESSAGE_A 10 /* Message A */
#define MESSAGE_B 11 /* Message B */
#define MESSAGE_C 12 /* Message C */
#define MESSAGE_D 13 /* Message D */
#define MESSAGE_E 14 /* Message E */
#define MESSAGE_F 15 /* Message F */
/*-------------------------------------------------------------------*/
/* Data areas */
/*-------------------------------------------------------------------*/
static CCKD_L2ENT empty_l2[CKDDASD_NULLTRK_FMTMAX+1][256];
static BYTE eighthexFF[] = {0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff};
DEVHND cckddasd_device_hndinfo;
DEVHND cfbadasd_device_hndinfo;
DLL_EXPORT CCKDBLK cckdblk; /* cckd global area */
/*-------------------------------------------------------------------*/
/* CCKD global initialization */
/*-------------------------------------------------------------------*/
int cckddasd_init (int argc, BYTE *argv[])
{
int i, j; /* Loop indexes */
UNREFERENCED(argc);
UNREFERENCED(argv);
if (memcmp (&cckdblk.id, "CCKDBLK ", sizeof(cckdblk.id)) == 0)
return 0;
/* Clear the cckdblk */
memset(&cckdblk, 0, sizeof(CCKDBLK));
/* Initialize locks and conditions */
memcpy (&cckdblk.id, "CCKDBLK ", sizeof(cckdblk.id));
initialize_lock (&cckdblk.gclock);
initialize_lock (&cckdblk.ralock);
initialize_lock (&cckdblk.wrlock);
initialize_lock (&cckdblk.devlock);
initialize_condition (&cckdblk.gccond);
initialize_condition (&cckdblk.racond);
initialize_condition (&cckdblk.wrcond);
initialize_condition (&cckdblk.devcond);
initialize_condition (&cckdblk.termcond);
/* Initialize some variables */
cckdblk.wrprio = 16;
cckdblk.ranbr = CCKD_DEFAULT_RA_SIZE;
cckdblk.ramax = CCKD_DEFAULT_RA;
cckdblk.wrmax = CCKD_DEFAULT_WRITER;
cckdblk.gcmax = CCKD_DEFAULT_GCOL;
cckdblk.gcwait = CCKD_DEFAULT_GCOLWAIT;
cckdblk.gcparm = CCKD_DEFAULT_GCOLPARM;
cckdblk.readaheads = CCKD_DEFAULT_READAHEADS;
cckdblk.freepend = CCKD_DEFAULT_FREEPEND;
#ifdef HAVE_LIBZ
cckdblk.comps |= CCKD_COMPRESS_ZLIB;
#endif
#ifdef CCKD_BZIP2
cckdblk.comps |= CCKD_COMPRESS_BZIP2;
#endif
cckdblk.comp = 0xff;
cckdblk.compparm = -1;
/* Initialize the readahead queue */
cckdblk.ra1st = cckdblk.ralast = -1;
cckdblk.rafree = 0;
for (i = 0; i < cckdblk.ranbr; i++) cckdblk.ra[i].next = i + 1;
cckdblk.ra[cckdblk.ranbr - 1].next = -1;
/* Clear the empty L2 tables */
for (i = 0; i <= CKDDASD_NULLTRK_FMTMAX; i++)
for (j = 0; j < 256; j++)
{
empty_l2[i][j].pos = 0;
empty_l2[i][j].len = empty_l2[i][j].size = i;
}
return 0;
} /* end function cckddasd_init */
/*-------------------------------------------------------------------*/
/* CCKD dasd global termination */
/*-------------------------------------------------------------------*/
int cckddasd_term ()
{
/* Terminate the readahead threads */
obtain_lock (&cckdblk.ralock);
cckdblk.ramax = 0;
if (cckdblk.ras)
{
broadcast_condition (&cckdblk.racond);
wait_condition (&cckdblk.termcond, &cckdblk.ralock);
}
release_lock (&cckdblk.ralock);
destroy_lock (&cckdblk.ralock);
destroy_condition (&cckdblk.racond);
/* Terminate the garbage collection threads */
obtain_lock (&cckdblk.gclock);
cckdblk.gcmax = 0;
if (cckdblk.gcs)
{
broadcast_condition (&cckdblk.gccond);
wait_condition (&cckdblk.termcond, &cckdblk.gclock);
}
release_lock (&cckdblk.gclock);
destroy_lock (&cckdblk.gclock);
destroy_condition (&cckdblk.gccond);
/* Terminate the writer threads */
obtain_lock (&cckdblk.wrlock);
cckdblk.wrmax = 0;
if (cckdblk.wrs)
{
broadcast_condition (&cckdblk.wrcond);
wait_condition (&cckdblk.termcond, &cckdblk.wrlock);
}
release_lock (&cckdblk.wrlock);
destroy_lock (&cckdblk.wrlock);
destroy_condition (&cckdblk.wrcond);
destroy_lock (&cckdblk.devlock);
destroy_condition (&cckdblk.devcond);
destroy_condition (&cckdblk.termcond);
memset(&cckdblk, 0, sizeof(CCKDBLK));
return 0;
} /* end function cckddasd_term */
/*-------------------------------------------------------------------*/
/* CKD dasd initialization */
/*-------------------------------------------------------------------*/
int cckddasd_init_handler ( DEVBLK *dev, int argc, char *argv[] )
{
CCKDDASD_EXT *cckd; /* -> cckd extension */
DEVBLK *dev2; /* -> device in cckd queue */
int i; /* Counter */
int fdflags; /* File flags */
UNREFERENCED(argc);
UNREFERENCED(argv);
/* Initialize the global cckd block if necessary */
if (memcmp (&cckdblk.id, "CCKDBLK ", sizeof(cckdblk.id)))
cckddasd_init (0, NULL);
/* Obtain area for cckd extension */
dev->cckd_ext = cckd = cckd_calloc (dev, "ext", 1, sizeof(CCKDDASD_EXT));
if (cckd == NULL)
return -1;
/* Initialize locks and conditions */
initialize_lock (&cckd->iolock);
initialize_lock (&cckd->filelock);
initialize_condition (&cckd->iocond);
/* Initialize some variables */
obtain_lock (&cckd->filelock);
cckd->l1x = cckd->sfx = cckd->l2active = -1;
dev->cache = cckd->free1st = -1;
cckd->fd[0] = dev->fd;
fdflags = get_file_accmode_flags( dev->fd );
cckd->open[0] = (fdflags & O_RDWR) ? CCKD_OPEN_RW : CCKD_OPEN_RO;
for (i = 1; i <= CCKD_MAX_SF; i++)
{
cckd->fd[i] = -1;
cckd->open[i] = CCKD_OPEN_NONE;
}
cckd->maxsize = sizeof(off_t) > 4 ? 0xffffffffll : 0x7fffffffll;
/* call the chkdsk function */
if (cckd_chkdsk (dev, 0) < 0)
return -1;
/* Perform initial read */
if (cckd_read_init (dev) < 0)
return -1;
if (cckd->fbadasd) dev->ckdtrksz = CFBA_BLOCK_SIZE;
/* open the shadow files */
if (cckd_sf_init (dev) < 0)
{
WRMSG (HHC00300, "E", SSID_TO_LCSS(dev->ssid), dev->devnum);
return -1;
}
/* Update the device handler routines */
if (cckd->ckddasd)
dev->hnd = &cckddasd_device_hndinfo;
else
dev->hnd = &cfbadasd_device_hndinfo;
release_lock (&cckd->filelock);
/* Insert the device into the cckd device queue */
cckd_lock_devchain(1);
for (cckd = NULL, dev2 = cckdblk.dev1st; dev2; dev2 = cckd->devnext)
cckd = dev2->cckd_ext;
if (cckd) cckd->devnext = dev;
else cckdblk.dev1st = dev;
cckd_unlock_devchain();
cckdblk.batch = dev->batch;
if (cckdblk.batch)
{
cckdblk.nostress = 1;
cckdblk.freepend = 0;
cckdblk.linuxnull = 1;
}
return 0;
} /* end function cckddasd_init_handler */
/*-------------------------------------------------------------------*/
/* Close a Compressed CKD Device */
/*-------------------------------------------------------------------*/
int cckddasd_close_device (DEVBLK *dev)
{
CCKDDASD_EXT *cckd; /* -> cckd extension */
int i; /* Index */
cckd = dev->cckd_ext;
/* Wait for readaheads to finish */
obtain_lock(&cckdblk.ralock);
cckd->stopping = 1;
while (cckd->ras)
{
release_lock(&cckdblk.ralock);
usleep(1);
obtain_lock(&cckdblk.ralock);
}
release_lock(&cckdblk.ralock);
/* Flush the cache and wait for the writes to complete */
obtain_lock (&cckd->iolock);
cckd->stopping = 1;
cckd_flush_cache (dev);
while (cckd->wrpending || cckd->ioactive)
{
cckd->iowaiters++;
wait_condition (&cckd->iocond, &cckd->iolock);
cckd->iowaiters--;
cckd_flush_cache (dev);
}
broadcast_condition (&cckd->iocond);
cckd_purge_cache (dev); cckd_purge_l2 (dev);
dev->bufcur = dev->cache = -1;
if (cckd->newbuf) cckd_free (dev, "newbuf", cckd->newbuf);
release_lock (&cckd->iolock);
/* Remove the device from the cckd queue */
cckd_lock_devchain(1);
if (dev == cckdblk.dev1st) cckdblk.dev1st = cckd->devnext;
else
{
DEVBLK *dev2 = cckdblk.dev1st;
CCKDDASD_EXT *cckd2 = dev2->cckd_ext;
while (cckd2->devnext != dev)
{
dev2 = cckd2->devnext; cckd2 = dev2->cckd_ext;
}
cckd2->devnext = cckd->devnext;
}
cckd_unlock_devchain();
/* harden the file */
obtain_lock (&cckd->filelock);
cckd_harden (dev);
/* close the shadow files */
for (i = 1; i <= cckd->sfn; i++)
{
cckd_close (dev, i);
cckd->open[i] = 0;
}
/* free the level 1 tables */
for (i = 0; i <= cckd->sfn; i++)
cckd->l1[i] = cckd_free (dev, "l1", cckd->l1[i]);
/* reset the device handler */
if (cckd->ckddasd)
dev->hnd = &ckddasd_device_hndinfo;
else
dev->hnd = &fbadasd_device_hndinfo;
/* write some statistics */
if (!dev->batch)
cckd_sf_stats (dev);
release_lock (&cckd->filelock);
/* free the cckd extension */
dev->cckd_ext= cckd_free (dev, "ext", cckd);
if (dev->dasdsfn) free (dev->dasdsfn);
dev->dasdsfn = NULL;
close (dev->fd);
dev->fd = -1;
/* If no more devices then perform global termination */
if (cckdblk.dev1st == NULL) cckddasd_term ();
return 0;
} /* end function cckddasd_close_device */
/*-------------------------------------------------------------------*/
/* Compressed ckd start/resume channel program */
/*-------------------------------------------------------------------*/
void cckddasd_start (DEVBLK *dev)
{
CCKDDASD_EXT *cckd; /* -> cckd extension */
U16 devnum = 0; /* Last active device number */
int trk = 0; /* Last active track */
cckd = dev->cckd_ext;
cckd_trace (dev, "start i/o file[%d] bufcur %d cache[%d]",
cckd->sfn, dev->bufcur, dev->cache);
/* Reset buffer offsets */
dev->bufoff = 0;
dev->bufoffhi = cckd->ckddasd ? dev->ckdtrksz : CFBA_BLOCK_SIZE;
#ifdef OPTION_SYNCIO
/* Check for merge - synchronous i/o should be disabled */
#else // OPTION_NOSYNCIO
/* Check for merge */
#endif // OPTION_SYNCIO
obtain_lock(&cckd->iolock);
if (cckd->merging)
{
cckd_trace (dev, "start i/o waiting for merge%s","");
while (cckd->merging)
{
cckd->iowaiters++;
wait_condition (&cckd->iocond, &cckd->iolock);
cckd->iowaiters--;
}
dev->bufcur = dev->cache = -1;
}
cckd->ioactive = 1;
cache_lock(CACHE_DEVBUF);
if (dev->cache >= 0)
CCKD_CACHE_GETKEY(dev->cache, devnum, trk);
/* Check if previous active entry is still valid and not busy */
if (dev->cache >= 0 && dev->devnum == devnum && dev->bufcur == trk
&& !(cache_getflag(CACHE_DEVBUF, dev->cache) & CCKD_CACHE_IOBUSY))
{
/* Make the entry active again */
cache_setflag (CACHE_DEVBUF, dev->cache, ~0, CCKD_CACHE_ACTIVE);
/* If the entry is pending write then change it to `updated' */
if (cache_getflag(CACHE_DEVBUF, dev->cache) & CCKD_CACHE_WRITE)
{
cache_setflag (CACHE_DEVBUF, dev->cache, ~CCKD_CACHE_WRITE, CCKD_CACHE_UPDATED);
cckd->wrpending--;
if (cckd->iowaiters && !cckd->wrpending)
broadcast_condition (&cckd->iocond);
}
}
else
dev->bufcur = dev->cache = -1;
cache_unlock (CACHE_DEVBUF);
release_lock (&cckd->iolock);
return;
} /* end function cckddasd_start */
/*-------------------------------------------------------------------*/
/* Compressed ckd end/suspend channel program */
/*-------------------------------------------------------------------*/
void cckddasd_end (DEVBLK *dev)
{
CCKDDASD_EXT *cckd; /* -> cckd extension */
cckd = dev->cckd_ext;
/* Update length if previous image was updated */
if (dev->bufupd && dev->bufcur >= 0 && dev->cache >= 0)
{
dev->buflen = cckd_trklen (dev, dev->buf);
cache_setval (CACHE_DEVBUF, dev->cache, dev->buflen);
}
dev->bufupd = 0;
cckd_trace (dev, "end i/o bufcur %d cache[%d] waiters %d",
dev->bufcur, dev->cache, cckd->iowaiters);
obtain_lock (&cckd->iolock);
cckd->ioactive = 0;
/* Make the current entry inactive */
if (dev->cache >= 0)
{
cache_lock (CACHE_DEVBUF);
cache_setflag (CACHE_DEVBUF, dev->cache, ~CCKD_CACHE_ACTIVE, 0);
cache_unlock (CACHE_DEVBUF);
}
/* Cause writers to start after first update */
if (cckd->updated && (cckdblk.wrs == 0 || cckd->iowaiters != 0))
cckd_flush_cache (dev);
else if (cckd->iowaiters)
broadcast_condition (&cckd->iocond);
release_lock (&cckd->iolock);
} /* end function cckddasd_end */
/*-------------------------------------------------------------------*/
/* Open a cckd file */
/* */
/* If O_CREAT is not set and mode is non-zero then the error message */
/* will be supressed. */
/*-------------------------------------------------------------------*/
int cckd_open (DEVBLK *dev, int sfx, int flags, mode_t mode)
{
CCKDDASD_EXT *cckd; /* -> cckd extension */
int err; /* 1 = issue error message */
char pathname[MAX_PATH]; /* file path in host format */
cckd = dev->cckd_ext;
err = !((flags & O_CREAT) == 0 && mode != 0);
if (cckd->fd[sfx] >= 0)
cckd_close (dev, sfx);
hostpath(pathname, cckd_sf_name (dev, sfx), sizeof(pathname));
cckd->fd[sfx] = HOPEN (pathname, flags, mode);
if (sfx == 0) dev->fd = cckd->fd[sfx];
if (cckd->fd[sfx] >= 0)
cckd->open[sfx] = flags & O_RDWR ? CCKD_OPEN_RW :
cckd->open[sfx] == CCKD_OPEN_RW ?
CCKD_OPEN_RD : CCKD_OPEN_RO;
else
{
if (err)
{
WRMSG (HHC00301, "E", SSID_TO_LCSS(dev->ssid), dev->devnum, sfx, cckd_sf_name (dev, sfx),
"open()", strerror(errno));
cckd_trace (dev, "file[%d] fd[%d] open %s error flags %8.8x mode %8.8x",
sfx, cckd->fd[sfx], cckd_sf_name (dev, sfx), flags, mode);
cckd_print_itrace ();
}
cckd->open[sfx] = CCKD_OPEN_NONE;
}
cckd_trace (dev, "file[%d] fd[%d] open %s, flags %8.8x mode %8.8x",
sfx, cckd->fd[sfx], cckd_sf_name (dev, sfx), flags, mode);
return cckd->fd[sfx];
} /* end function cckd_open */
/*-------------------------------------------------------------------*/
/* Close a cckd file */
/*-------------------------------------------------------------------*/
int cckd_close (DEVBLK *dev, int sfx)
{
CCKDDASD_EXT *cckd; /* -> cckd extension */
int rc = 0; /* Return code */
cckd = dev->cckd_ext;
cckd_trace (dev, "file[%d] fd[%d] close %s",
sfx, cckd->fd[sfx], cckd_sf_name(dev, sfx));
if (cckd->fd[sfx] >= 0)
rc = close (cckd->fd[sfx]);
if (rc < 0)
{
WRMSG (HHC00301, "E", SSID_TO_LCSS(dev->ssid), dev->devnum, sfx, cckd_sf_name (dev, sfx),
"close()", strerror(errno));
cckd_print_itrace ();
}
cckd->fd[sfx] = -1;
if (sfx == 0) dev->fd = -1;
return rc;
} /* end function cckd_close */
/*-------------------------------------------------------------------*/
/* Read from a cckd file */
/*-------------------------------------------------------------------*/
int cckd_read (DEVBLK *dev, int sfx, off_t off, void *buf, unsigned int len)
{
CCKDDASD_EXT *cckd; /* -> cckd extension */
int rc; /* Return code */
cckd = dev->cckd_ext;
cckd_trace (dev, "file[%d] fd[%d] read, off 0x"I64_FMTx" len %d",
sfx, cckd->fd[sfx], off, len);
/* Seek to specified offset */
if (lseek (cckd->fd[sfx], off, SEEK_SET) < 0)
{
WRMSG (HHC00302, "E", SSID_TO_LCSS(dev->ssid), dev->devnum, sfx, cckd_sf_name (dev, sfx),
"lseek()", off, strerror(errno));
cckd_print_itrace ();
return -1;
}
/* Read the data */
rc = read (cckd->fd[sfx], buf, len);
if (rc < (int)len)
{
if (rc < 0)
WRMSG (HHC00302, "E", SSID_TO_LCSS(dev->ssid), dev->devnum, sfx, cckd_sf_name (dev, sfx),
"read()", off, strerror(errno));
else
{
char buf[128];
MSGBUF( buf, "read incomplete: read %d, expected %d", rc, len);
WRMSG (HHC00302, "E", SSID_TO_LCSS(dev->ssid), dev->devnum, sfx, cckd_sf_name (dev, sfx),
"read()", off, buf);
}
cckd_print_itrace ();
return -1;
}
return rc;
} /* end function cckd_read */
/*-------------------------------------------------------------------*/
/* Write to a cckd file */
/*-------------------------------------------------------------------*/
int cckd_write (DEVBLK *dev, int sfx, off_t off, void *buf, unsigned int len)
{
CCKDDASD_EXT *cckd; /* -> cckd extension */
int rc = 0; /* Return code */
cckd = dev->cckd_ext;
cckd_trace (dev, "file[%d] fd[%d] write, off 0x"I64_FMTx" len %d",
sfx, cckd->fd[sfx], off, len);
/* Seek to specified offset */
if (lseek (cckd->fd[sfx], off, SEEK_SET) < 0)
{
WRMSG (HHC00302, "E", SSID_TO_LCSS(dev->ssid), dev->devnum, sfx, cckd_sf_name (dev, sfx),
"lseek()", off, strerror(errno));
return -1;
}
/* Write the data */
rc = write (cckd->fd[sfx], buf, len);
if (rc < (int)len)
{
if (rc < 0)
WRMSG (HHC00302, "E", SSID_TO_LCSS(dev->ssid), dev->devnum, sfx, cckd_sf_name (dev, sfx),
"write()", off, strerror(errno));
else
{
char buf[128];
MSGBUF( buf, "write incomplete: write %d, expected %d", rc, len);
WRMSG (HHC00302, "E", SSID_TO_LCSS(dev->ssid), dev->devnum, sfx, cckd_sf_name (dev, sfx),
"write()", off, buf);
}
cckd_print_itrace ();
return -1;
}
return rc;
} /* end function cckd_write */
/*-------------------------------------------------------------------*/
/* Truncate a cckd file */
/*-------------------------------------------------------------------*/
int cckd_ftruncate(DEVBLK *dev, int sfx, off_t off)
{
CCKDDASD_EXT *cckd; /* -> cckd extension */
cckd = dev->cckd_ext;
cckd_trace (dev, "file[%d] fd[%d] ftruncate, off 0x"I64_FMTx,
sfx, cckd->fd[sfx], off);
/* Truncate the file */
if (ftruncate (cckd->fd[sfx], off) < 0)
{
WRMSG (HHC00302, "E", SSID_TO_LCSS(dev->ssid), dev->devnum, sfx, cckd_sf_name (dev, sfx),
"ftruncate()", off, strerror(errno));
cckd_print_itrace ();
return -1;
}
return 0;
} /* end function cckd_ftruncate */
/*-------------------------------------------------------------------*/
/* malloc */
/*-------------------------------------------------------------------*/
void *cckd_malloc (DEVBLK *dev, char *id, size_t size)
{
void *p; /* Pointer */
p = malloc (size);
cckd_trace (dev, "%s malloc %p len %ld", id, p, (long)size);
if (p == NULL)
{
char buf[64];
MSGBUF( buf, "malloc(%d)", (int)size);
WRMSG (HHC00303, "E", dev ? SSID_TO_LCSS(dev->ssid) : 0, dev ? dev->devnum : 0, buf, strerror(errno));
cckd_print_itrace ();
}
return p;
} /* end function cckd_malloc */
/*-------------------------------------------------------------------*/
/* calloc */
/*-------------------------------------------------------------------*/
void *cckd_calloc (DEVBLK *dev, char *id, size_t n, size_t size)
{
void *p; /* Pointer */
p = calloc (n, size);
cckd_trace (dev, "%s calloc %p len %ld", id, p, n*(long)size);
if (p == NULL)
{
char buf[64];
MSGBUF( buf, "calloc(%d, %d)", (int)n, (int)size);
WRMSG (HHC00303, "E", dev ? SSID_TO_LCSS(dev->ssid) : 0, dev ? dev->devnum : 0, buf, strerror(errno));
cckd_print_itrace ();
}
return p;
} /* end function cckd_calloc */
/*-------------------------------------------------------------------*/
/* free */
/*-------------------------------------------------------------------*/
void *cckd_free (DEVBLK *dev, char *id, void *p)
{
cckd_trace (dev, "%s free %p", id, p);
if (p) free (p);
return (void*)NULL;
} /* end function cckd_free */
/*-------------------------------------------------------------------*/
/* Compressed ckd read track image */
/*-------------------------------------------------------------------*/
int cckd_read_track (DEVBLK *dev, int trk, BYTE *unitstat)
{
CCKDDASD_EXT *cckd; /* -> cckd extension */
int rc; /* Return code */
int len; /* Compressed length */
BYTE *newbuf; /* Uncompressed buffer */
int cache; /* New active cache entry */
#ifdef OPTION_SYNCIO
int syncio; /* Syncio indicator */
#endif // OPTION_SYNCIO
cckd = dev->cckd_ext;
/* Update length if previous image was updated */
if (dev->bufupd && dev->bufcur >= 0 && dev->cache >= 0)
{
dev->buflen = cckd_trklen (dev, dev->buf);
cache_setval (CACHE_DEVBUF, dev->cache, dev->buflen);
}
#ifdef OPTION_SYNCIO
/* Turn off the synchronous I/O bit if trk overflow or trk 0 */
syncio = dev->syncio_active;
if (dev->ckdtrkof || trk == 0)
dev->syncio_active = 0;
#endif // OPTION_SYNCIO
/* Reset buffer offsets */
dev->bufoff = 0;
dev->bufoffhi = dev->ckdtrksz;
/* Check if reading the same track image */
if (trk == dev->bufcur && dev->cache >= 0)
{
/* Track image may be compressed */
if ((dev->buf[0] & CCKD_COMPRESS_MASK) != 0
&& (dev->buf[0] & dev->comps) == 0)
{
#ifdef OPTION_SYNCIO
#if 0
/* Return if synchronous i/o */
if (dev->syncio_active)
{
cckd_trace (dev, "read trk %d syncio compressed", trk);
cckdblk.stats_synciomisses++;
dev->syncio_retry = 1;
return -1;
}
#endif
#endif // OPTION_SYNCIO
len = cache_getval(CACHE_DEVBUF, dev->cache);
newbuf = cckd_uncompress (dev, dev->buf, len, dev->ckdtrksz, trk);
if (newbuf == NULL) {
ckd_build_sense (dev, SENSE_EC, 0, 0, FORMAT_1, MESSAGE_0);
*unitstat = CSW_CE | CSW_DE | CSW_UC;
dev->bufcur = dev->cache = -1;
#ifdef OPTION_SYNCIO
dev->syncio_active = syncio;
#endif // OPTION_SYNCIO
return -1;
}
cache_setbuf (CACHE_DEVBUF, dev->cache, newbuf, dev->ckdtrksz);
dev->buf = newbuf;
dev->buflen = cckd_trklen (dev, newbuf);
cache_setval (CACHE_DEVBUF, dev->cache, dev->buflen);
dev->bufsize = cache_getlen (CACHE_DEVBUF, dev->cache);
dev->bufupd = 0;
cckd_trace (dev, "read trk %d uncompressed len %d",
trk, dev->buflen);
}
dev->comp = dev->buf[0] & CCKD_COMPRESS_MASK;
if (dev->comp != 0) dev->compoff = CKDDASD_TRKHDR_SIZE;
return 0;
}
cckd_trace (dev, "read trk %d (%s)", trk,
#ifdef OPTION_SYNCIO
dev->syncio_active ? "synchronous" :
#endif // OPTION_SYNCIO
"asynchronous");
/* read the new track */
dev->bufupd = 0;
*unitstat = 0;
cache = cckd_read_trk (dev, trk, 0, unitstat);
if (cache < 0)
{
dev->bufcur = dev->cache = -1;
return -1;
}
dev->cache = cache;
dev->buf = cache_getbuf (CACHE_DEVBUF, dev->cache, 0);
dev->bufcur = trk;
dev->bufoff = 0;
dev->bufoffhi = dev->ckdtrksz;
dev->buflen = cache_getval (CACHE_DEVBUF, dev->cache);
dev->bufsize = cache_getlen (CACHE_DEVBUF, dev->cache);
dev->comp = dev->buf[0] & CCKD_COMPRESS_MASK;
if (dev->comp != 0) dev->compoff = CKDDASD_TRKHDR_SIZE;
/* If the image is compressed then call ourself recursively
to cause the image to get uncompressed */
if (dev->comp != 0 && (dev->comp & dev->comps) == 0)
rc = cckd_read_track (dev, trk, unitstat);
else
rc = 0;
#ifdef OPTION_SYNCIO
dev->syncio_active = syncio;
#endif // OPTION_SYNCIO
return rc;
} /* end function cckd_read_track */
/*-------------------------------------------------------------------*/
/* Compressed ckd update track image */
/*-------------------------------------------------------------------*/
int cckd_update_track (DEVBLK *dev, int trk, int off,
BYTE *buf, int len, BYTE *unitstat)
{
CCKDDASD_EXT *cckd; /* -> cckd extension */
int rc; /* Return code */
cckd = dev->cckd_ext;
/* Error if opened read-only */
if (dev->ckdrdonly && cckd->sfn == 0)
{
ckd_build_sense (dev, SENSE_EC, SENSE1_WRI, 0,FORMAT_1, MESSAGE_0);
*unitstat = CSW_CE | CSW_DE | CSW_UC;
dev->bufcur = dev->cache = -1;
return -1;
}
/* If the track is not current or compressed then read it.
`dev->comps' is set to zero forcing the read routine to
uncompress the image. */
if (trk != dev->bufcur || (dev->buf[0] & CCKD_COMPRESS_MASK) != 0)
{
dev->comps = 0;
rc = (dev->hnd->read) (dev, trk, unitstat);
if (rc < 0)
{
dev->bufcur = dev->cache = -1;
return -1;
}
}
/* Invalid track format if going past buffer end */
if (off + len > dev->ckdtrksz)
{
ckd_build_sense (dev, 0, SENSE1_ITF, 0, 0, 0);
*unitstat = CSW_CE | CSW_DE | CSW_UC;
dev->bufcur = dev->cache = -1;
return -1;
}
/* Copy the data into the buffer */
if (buf && len > 0) memcpy (dev->buf + off, buf, len);
cckd_trace (dev, "updt trk %d offset %d length %d",
trk, off, len);
/* Update the cache entry */
cache_setflag (CACHE_DEVBUF, dev->cache, ~0, CCKD_CACHE_UPDATED | CCKD_CACHE_USED);
cckd->updated = 1;
/* Notify the shared server of the update */
if (!dev->bufupd)
{
dev->bufupd = 1;
shared_update_notify (dev, trk);
}
return len;
} /* end function cckd_update_track */
/*-------------------------------------------------------------------*/
/* Return used cylinders */
/*-------------------------------------------------------------------*/
int cckd_used (DEVBLK *dev)
{
CCKDDASD_EXT *cckd; /* -> cckd extension */
int rc; /* Return code */
int l1x, l2x; /* Lookup table indexes */