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cckddasd64.c
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cckddasd64.c
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/* CCKDDASD64.C (C) Copyright Roger Bowler, 1999-2012 */
/* (C) Copyright Greg Smith, 2002-2012 */
/* (C) and others 2013-2022 */
/* */
/* CCKD (Compressed CKD) 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 _CCKDDASD64_C_
#define _HDASD_DLL_
#include "hercules.h"
#include "devtype.h"
#include "opcode.h"
#include "dasdblks.h"
#include "cckddasd.h"
#include "ccwarn.h"
DISABLE_GCC_UNUSED_SET_WARNING;
/*-------------------------------------------------------------------*/
/* Compressed CKD dasd initialization */
/*-------------------------------------------------------------------*/
int cckd64_dasd_init_handler ( DEVBLK *dev, int argc, char *argv[] )
{
CCKD64_EXT *cckd; /* -> cckd extension */
DEVBLK *dev2; /* -> device in cckd queue */
int i; /* Counter */
int fdflags; /* File flags */
char buf[32]; /* Work buffer */
UNREFERENCED( argc );
UNREFERENCED( argv );
/* Initialize the global cckd block if necessary */
if (memcmp( &cckdblk.id, CCKDBLK_ID, sizeof( cckdblk.id )))
cckd_dasd_init( 0, NULL );
/* Obtain area for cckd extension */
dev->cckd_ext = cckd = cckd_calloc( dev, "ext", 1, sizeof( CCKD64_EXT ));
if (cckd == NULL)
return -1;
/* Initialize locks and conditions */
initialize_lock( &cckd->cckdiolock );
MSGBUF( buf, "&cckd->cckdiolock %1d:%04X", LCSS_DEVNUM );
set_lock_name( &cckd->cckdiolock, buf );
initialize_lock( &cckd->filelock );
MSGBUF( buf, "&cckd->filelock %1d:%04X", LCSS_DEVNUM );
set_lock_name( &cckd->filelock, buf );
initialize_condition( &cckd->cckdiocond );
/* Initialize some variables */
obtain_lock( &cckd->filelock );
{
cckd->L1idx = cckd->sfx = cckd->L2_active = -1;
dev->cache = cckd->free_idx1st = -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->cckd_maxsize = CCKD64_MAXSIZE;
/* call the chkdsk function */
if (cckd64_chkdsk (dev, 0) < 0)
return -1;
/* Perform initial read */
if (cckd64_read_init (dev) < 0)
return -1;
if (cckd->fbadasd) dev->ckdtrksz = CFBA_BLKGRP_SIZE;
/* open the shadow files */
if (cckd64_sf_init (dev) < 0)
{
WRMSG (HHC00300, "E", LCSS_DEVNUM);
return -1;
}
/* Update the device handler routines */
if (cckd->ckddasd)
dev->hnd = &cckd_dasd_device_hndinfo;
else
dev->hnd = &cfba_dasd_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 cckd64_dasd_init_handler */
/*-------------------------------------------------------------------*/
/* Close a Compressed CKD Device */
/*-------------------------------------------------------------------*/
int cckd64_dasd_close_device (DEVBLK *dev)
{
CCKD64_EXT *cckd; /* -> cckd extension */
int rc, i; /* Return code, Loop index */
if (!dev->cckd64)
return cckd_dasd_close_device( dev );
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->cckdiolock );
{
cckd->stopping = 1;
cckd64_flush_cache( dev );
while (cckd->wrpending || cckd->cckdioact)
{
cckd->cckdwaiters++;
rc = timed_wait_condition_relative_usecs(
&cckd->cckdiocond, &cckd->cckdiolock, 1000000, NULL );
cckd->cckdwaiters--;
cckd64_flush_cache( dev );
if (EINTR == rc)
continue;
/* Prevent rare but possible hang at shutdown */
if (1
&& ETIMEDOUT == rc
&& (cckd->wrpending || cckd->cckdioact)
&& sysblk.shutdown
)
{
CCKD_TRACE( "closing device while wrpending=%d cckdioact=%d",
cckd->wrpending, cckd->cckdioact );
// "%1d:%04X CCKD file %s: closing device while wrpending=%d cckdioact=%d"
WRMSG( HHC00381, "W", LCSS_DEVNUM, dev->filename,
cckd->wrpending, cckd->cckdioact );
break;
}
}
broadcast_condition( &cckd->cckdiocond );
cckd64_purge_cache( dev );
cckd64_purge_l2( dev );
dev->bufcur = -1;
dev->cache = -1;
if (cckd->newbuf)
cckd_free( dev, "newbuf", cckd->newbuf );
}
release_lock( &cckd->cckdiolock );
/* Remove the device from the cckd queue */
cckd_lock_devchain(1);
if (dev == cckdblk.dev1st) cckdblk.dev1st = cckd->devnext;
else
{
DEVBLK *dev2 = cckdblk.dev1st;
CCKD64_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 );
{
cckd64_harden (dev);
/* close the shadow files */
for (i = 1; i <= cckd->sfn; i++)
{
cckd64_close (dev, i);
cckd->open[i] = 0;
}
/* free the level 1 tables */
for (i = 0; i <= cckd->sfn; i++)
cckd->L1tab[i] = cckd_free (dev, "l1", cckd->L1tab[i]);
/* reset the device handler */
if (cckd->ckddasd)
dev->hnd = &ckd_dasd_device_hndinfo;
else
dev->hnd = &fba_dasd_device_hndinfo;
/* write some statistics */
if (!dev->batch && !cckdblk.nosfd)
cckd64_sf_stats (dev);
}
release_lock( &cckd->filelock );
/* Destroy the cckd extension's locks and conditions */
destroy_lock( &cckd->cckdiolock );
destroy_lock( &cckd->filelock );
destroy_condition( &cckd->cckdiocond );
/* free the cckd extension itself */
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 */
cckd_dasd_term_if_appropriate();
dev->buf = NULL;
dev->bufsize = 0;
return 0;
} /* end function cckd64_dasd_close_device */
/*-------------------------------------------------------------------*/
/* Compressed ckd start/resume channel program */
/*-------------------------------------------------------------------*/
void cckd64_dasd_start (DEVBLK *dev)
{
CCKD64_EXT *cckd; /* -> cckd extension */
U16 devnum = 0; /* Last active device number */
int trk = 0; /* Last active track */
if (!dev->cckd64)
{
cckd_dasd_start( dev );
return;
}
cckd = dev->cckd_ext;
CCKD_TRACE( "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_BLKGRP_SIZE;
/* Check for merge */
obtain_lock(&cckd->cckdiolock);
if (cckd->merging)
{
CCKD_TRACE( "start i/o waiting for merge%s","");
while (cckd->merging)
{
cckd->cckdwaiters++;
wait_condition (&cckd->cckdiocond, &cckd->cckdiolock);
cckd->cckdwaiters--;
}
dev->bufcur = dev->cache = -1;
}
cckd->cckdioact = 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->cckdwaiters && !cckd->wrpending)
broadcast_condition (&cckd->cckdiocond);
}
}
else
dev->bufcur = dev->cache = -1;
cache_unlock (CACHE_DEVBUF);
release_lock (&cckd->cckdiolock);
return;
} /* end function cckd64_dasd_start */
/*-------------------------------------------------------------------*/
/* Compressed ckd end/suspend channel program */
/*-------------------------------------------------------------------*/
void cckd64_dasd_end (DEVBLK *dev)
{
CCKD64_EXT *cckd; /* -> cckd extension */
if (!dev->cckd64)
{
cckd_dasd_end( dev );
return;
}
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( "end i/o bufcur %d cache[%d] waiters %d",
dev->bufcur, dev->cache, cckd->cckdwaiters);
obtain_lock (&cckd->cckdiolock);
cckd->cckdioact = 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->cckdwaiters != 0))
cckd64_flush_cache (dev);
else if (cckd->cckdwaiters)
broadcast_condition (&cckd->cckdiocond);
release_lock (&cckd->cckdiolock);
} /* end function cckd64_dasd_end */
/*-------------------------------------------------------------------*/
/* Open a cckd file */
/* */
/* If O_CREAT is not set and mode is non-zero then the error message */
/* will be supressed. */
/*-------------------------------------------------------------------*/
int cckd64_open (DEVBLK *dev, int sfx, int flags, mode_t mode)
{
CCKD64_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)
cckd64_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", LCSS_DEVNUM, sfx, cckd_sf_name (dev, sfx),
"open()", strerror(errno));
CCKD_TRACE( "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( "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 cckd64_open */
/*-------------------------------------------------------------------*/
/* Close a cckd file */
/*-------------------------------------------------------------------*/
int cckd64_close (DEVBLK *dev, int sfx)
{
CCKD64_EXT *cckd; /* -> cckd extension */
int rc = 0; /* Return code */
cckd = dev->cckd_ext;
CCKD_TRACE( "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", LCSS_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 cckd64_close */
/*-------------------------------------------------------------------*/
/* Read from a cckd file */
/*-------------------------------------------------------------------*/
int cckd64_read( DEVBLK* dev, int sfx, U64 off, void* buf, unsigned int len )
{
CCKD64_EXT *cckd; /* -> cckd extension */
int rc; /* Return code */
cckd = dev->cckd_ext;
CCKD_TRACE( "file[%d] fd[%d] read, off 0x%16.16"PRIx64" len %d",
sfx, cckd->fd[ sfx ], off, len );
/* Seek to specified offset */
if (lseek( cckd->fd[ sfx ], off, SEEK_SET ) < 0)
{
// "%1d:%04X CCKD file[%d] %s: error in function %s at offset 0x%16.16"PRIX64": %s"
WRMSG( HHC00302, "E", LCSS_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)
// "%1d:%04X CCKD file[%d] %s: error in function %s at offset 0x%16.16"PRIX64": %s"
WRMSG( HHC00302, "E", LCSS_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 );
// "%1d:%04X CCKD file[%d] %s: error in function %s at offset 0x%16.16"PRIX64": %s"
WRMSG( HHC00302, "E", LCSS_DEVNUM, sfx, cckd_sf_name( dev, sfx ),
"read()", off, buf );
}
cckd_print_itrace();
return -1;
}
return rc;
} /* end function cckd64_read */
/*-------------------------------------------------------------------*/
/* Write to a cckd file */
/*-------------------------------------------------------------------*/
int cckd64_write( DEVBLK* dev, int sfx, U64 off, void* buf, unsigned int len )
{
CCKD64_EXT *cckd; /* -> cckd extension */
int rc = 0; /* Return code */
cckd = dev->cckd_ext;
CCKD_TRACE( "file[%d] fd[%d] write, off 0x%16.16"PRIx64" len %d",
sfx, cckd->fd[ sfx ], off, len );
/* Seek to specified offset */
if (lseek( cckd->fd[ sfx ], off, SEEK_SET ) < 0)
{
// "%1d:%04X CCKD file[%d] %s: error in function %s at offset 0x%16.16"PRIX64": %s"
WRMSG( HHC00302, "E", LCSS_DEVNUM, sfx, cckd_sf_name( dev, sfx ),
"lseek()", off, strerror( errno ));
cckd_print_itrace();
return -1;
}
/* Write the data */
rc = write( cckd->fd[ sfx ], buf, len );
if (rc < (int)len)
{
if (rc < 0)
// "%1d:%04X CCKD file[%d] %s: error in function %s at offset 0x%16.16"PRIX64": %s"
WRMSG( HHC00302, "E", LCSS_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 );
// "%1d:%04X CCKD file[%d] %s: error in function %s at offset 0x%16.16"PRIX64": %s"
WRMSG( HHC00302, "E", LCSS_DEVNUM, sfx, cckd_sf_name( dev, sfx ),
"write()", off, buf );
}
cckd_print_itrace();
return -1;
}
return rc;
} /* end function cckd64_write */
/*-------------------------------------------------------------------*/
/* Truncate a cckd file */
/*-------------------------------------------------------------------*/
int cckd64_ftruncate(DEVBLK *dev, int sfx, U64 off)
{
CCKD64_EXT *cckd; /* -> cckd extension */
cckd = dev->cckd_ext;
CCKD_TRACE( "file[%d] fd[%d] ftruncate, off 0x%16.16"PRIx64,
sfx, cckd->fd[sfx], off);
/* Truncate the file */
if (ftruncate (cckd->fd[sfx], off) < 0)
{
WRMSG (HHC00302, "E", LCSS_DEVNUM, sfx, cckd_sf_name (dev, sfx),
"ftruncate()", off, strerror(errno));
cckd_print_itrace ();
return -1;
}
return 0;
} /* end function cckd64_ftruncate */
/*-------------------------------------------------------------------*/
/* Compressed ckd read track image */
/*-------------------------------------------------------------------*/
int cckd64_read_track (DEVBLK *dev, int trk, BYTE *unitstat)
{
CCKD64_EXT *cckd; /* -> cckd extension */
int rc; /* Return code */
int len; /* Compressed length */
BYTE *newbuf; /* Uncompressed buffer */
int cache; /* New active cache entry */
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);
}
/* 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)
{
len = cache_getval(CACHE_DEVBUF, dev->cache);
newbuf = cckd64_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;
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( "read trk %d uncompressed len %d",
trk, dev->buflen);
}
dev->comp = dev->buf[0] & CCKD_COMPRESS_MASK;
if (dev->comp != 0) dev->compoff = CKD_TRKHDR_SIZE;
return 0;
}
CCKD_TRACE( "read trk %d (%s)", trk, "asynchronous");
/* read the new track */
dev->bufupd = 0;
cache = cckd64_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 = CKD_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 = cckd64_read_track (dev, trk, unitstat);
else
rc = 0;
return rc;
} /* end function cckd64_read_track */
/*-------------------------------------------------------------------*/
/* Compressed ckd update track image */
/*-------------------------------------------------------------------*/
int cckd64_update_track (DEVBLK *dev, int trk, int off,
BYTE *buf, int len, BYTE *unitstat)
{
CCKD64_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( "updt trk %d offset %"PRId64" 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 cckd64_update_track */
/*-------------------------------------------------------------------*/
/* Return used cylinders */
/*-------------------------------------------------------------------*/
int cckd64_used (DEVBLK *dev)
{
CCKD64_EXT *cckd; /* -> cckd extension */
int rc; /* Return code */
int L1idx, l2x; /* Lookup table indexes */
int sfx; /* Shadow file suffix */
CCKD64_L2ENT l2; /* Copied level 2 entry */
if (!dev->cckd64)
return cckd_used( dev );
cckd = dev->cckd_ext;
obtain_lock( &cckd->filelock );
{
/* Find the last used level 1 table entry */
for (L1idx = cckd->cdevhdr[0].num_L1tab - 1; L1idx > 0; L1idx--)
{
sfx = cckd->sfn;
while (cckd->L1tab[sfx][L1idx] == CCKD64_MAXSIZE && sfx > 0) sfx--;
if (cckd->L1tab[sfx][L1idx]) break;
}
/* Find the last used level 2 table entry */
for (l2x = 255; l2x >= 0; l2x--)
{
rc = cckd64_read_l2ent (dev, &l2, L1idx * 256 + l2x);
if (rc < 0 || l2.L2_trkoff != 0) break;
}
}
release_lock( &cckd->filelock );
return (L1idx * 256 + l2x + dev->ckdheads) / dev->ckdheads;
}
/*-------------------------------------------------------------------*/
/* Compressed fba read block(s) */
/*-------------------------------------------------------------------*/
int cfba64_read_block (DEVBLK *dev, int blkgrp, BYTE *unitstat)
{
CCKD64_EXT *cckd; /* -> cckd extension */
int rc; /* Return code */
int cache; /* New active cache entry */
BYTE *cbuf; /* -> cache buffer */
BYTE *newbuf; /* Uncompressed buffer */
int len; /* Compressed length */
int maxlen; /* Size for cache entry */
cckd = dev->cckd_ext;
if (dev->cache >= 0)
cbuf = cache_getbuf (CACHE_DEVBUF, dev->cache, 0);
else
cbuf = NULL;
maxlen = CFBA_BLKGRP_SIZE + CKD_TRKHDR_SIZE;
/* Return if reading the same track image */
if (blkgrp == dev->bufcur && dev->cache >= 0)
{
/* Block group image may be compressed */
if ((cbuf[0] & CCKD_COMPRESS_MASK) != 0
&& (cbuf[0] & dev->comps) == 0)
{
len = cache_getval(CACHE_DEVBUF, dev->cache) + CKD_TRKHDR_SIZE;
newbuf = cckd64_uncompress (dev, cbuf, len, maxlen, blkgrp);
if (newbuf == NULL) {
dev->sense[0] = SENSE_EC;
*unitstat = CSW_CE | CSW_DE | CSW_UC;
dev->bufcur = dev->cache = -1;
return -1;
}
cache_setbuf (CACHE_DEVBUF, dev->cache, newbuf, maxlen);
cbuf = newbuf;
dev->buf = newbuf + CKD_TRKHDR_SIZE;
dev->buflen = CFBA_BLKGRP_SIZE;
cache_setval (CACHE_DEVBUF, dev->cache, dev->buflen);
dev->bufsize = cache_getlen (CACHE_DEVBUF, dev->cache);
dev->bufupd = 0;
CCKD_TRACE( "read bkgrp %d uncompressed len %d",
blkgrp, dev->buflen);
}
dev->comp = cbuf[0] & CCKD_COMPRESS_MASK;
return 0;
}
CCKD_TRACE( "read blkgrp %d (%s)", blkgrp, "asynchronous");
/* Read the new blkgrp */
dev->bufupd = 0;
cache = cckd64_read_trk (dev, blkgrp, 0, unitstat);
if (cache < 0)
{
dev->bufcur = dev->cache = -1;
return -1;
}
dev->cache = cache;
cbuf = cache_getbuf (CACHE_DEVBUF, dev->cache, 0);
dev->buf = cbuf + CKD_TRKHDR_SIZE;
dev->bufcur = blkgrp;
dev->bufoff = 0;
dev->bufoffhi = CFBA_BLKGRP_SIZE;
dev->buflen = CFBA_BLKGRP_SIZE;
cache_setval (CACHE_DEVBUF, dev->cache, dev->buflen);
dev->bufsize = cache_getlen (CACHE_DEVBUF, dev->cache);
dev->comp = cbuf[0] & CCKD_COMPRESS_MASK;
/* If the image is compressed then call ourself recursively
to cause the image to get uncompressed. This is because
`bufcur' will match blkgrp and `comps' won't match `comp' */
if (dev->comp != 0 && (dev->comp & dev->comps) == 0)
rc = cfba64_read_block (dev, blkgrp, unitstat);
else
rc = 0;
return rc;
} /* end function cfba64_read_block */
/*-------------------------------------------------------------------*/
/* Compressed fba write block(s) */
/*-------------------------------------------------------------------*/
int cfba64_write_block (DEVBLK *dev, int blkgrp, int off,
BYTE *buf, int len, BYTE *unitstat)
{
CCKD64_EXT *cckd; /* -> cckd extension */
int rc; /* Return code */
BYTE *cbuf; /* -> cache buffer */
cckd = dev->cckd_ext;
if (dev->cache >= 0)
cbuf = cache_getbuf (CACHE_DEVBUF, dev->cache, 0);
else
cbuf = NULL;
/* Read the block group if it's not current or compressed.
`dev->comps' is set to zero forcing the read routine to
uncompress the image. */
if (blkgrp != dev->bufcur || (cbuf[0] & CCKD_COMPRESS_MASK) != 0)
{
dev->comps = 0;
rc = (dev->hnd->read) (dev, blkgrp, unitstat);
if (rc < 0)
{
dev->bufcur = dev->cache = -1;
return -1;
}
}
/* Copy the data into the buffer */
if (buf) memcpy (dev->buf + off, buf, 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, blkgrp);
}
return len;
} /* end function cfba64_write_block */
/*-------------------------------------------------------------------*/
/* Return used blocks */
/*-------------------------------------------------------------------*/
int cfba64_used (DEVBLK *dev)
{
CCKD64_EXT *cckd; /* -> cckd extension */
int rc; /* Return code */
int L1idx, l2x; /* Lookup table indexes */
int sfx; /* Shadow file suffix */
CCKD64_L2ENT l2; /* Copied level 2 entry */
if (!dev->cckd64)
return cfba_used( dev );
cckd = dev->cckd_ext;
obtain_lock( &cckd->filelock );
{
/* Find the last used level 1 table entry */
for (L1idx = cckd->cdevhdr[0].num_L1tab - 1; L1idx > 0; L1idx--)
{
sfx = cckd->sfn;
while (cckd->L1tab[sfx][L1idx] == CCKD64_MAXSIZE && sfx > 0) sfx--;
if (cckd->L1tab[sfx][L1idx]) break;
}
/* Find the last used level 2 table entry */
for (l2x = 255; l2x >= 0; l2x--)
{
rc = cckd64_read_l2ent (dev, &l2, L1idx * 256 + l2x);
if (rc < 0 || l2.L2_trkoff != 0) break;
}
}
release_lock( &cckd->filelock );
return (L1idx * 256 + l2x + CFBA_BLKS_PER_GRP) / CFBA_BLKS_PER_GRP;
}
/*-------------------------------------------------------------------*/
/* Read a track image */
/* */
/* This routine can be called by the i/o thread (`ra' == 0) or */
/* by readahead threads (0 < `ra' <= cckdblk.ramax). */
/* */
/*-------------------------------------------------------------------*/
int cckd64_read_trk(DEVBLK *dev, int trk, int ra, BYTE *unitstat)
{
CCKD64_EXT *cckd; /* -> cckd extension */
int fnd; /* Cache index for hit */
int lru; /* Oldest unused cache index */
int len; /* Length of track image */
int maxlen; /* Length for buffer */
int curtrk = -1; /* Current track (at entry) */
U16 devnum; /* Device number */
U32 oldtrk; /* Stolen track number */
U32 flag; /* Cache flag */
BYTE *buf; /* Read buffer */
if (!dev->cckd64)
return cckd_read_trk( dev, trk, ra, unitstat );
cckd = dev->cckd_ext;
CCKD_TRACE( "%d rdtrk %d", ra, trk);
maxlen = cckd->ckddasd ? dev->ckdtrksz
: CKD_TRKHDR_SIZE + CFBA_BLKGRP_SIZE;
if (!ra) obtain_lock (&cckd->cckdiolock);
cache_lock (CACHE_DEVBUF);
/* Inactivate the old entry */
if (!ra)
{
curtrk = dev->bufcur;
if (dev->cache >= 0)
cache_setflag(CACHE_DEVBUF, dev->cache, ~CCKD_CACHE_ACTIVE, 0);
dev->bufcur = dev->cache = -1;
}
cckd_read_trk_retry:
/* scan the cache array for the track */
fnd = cache_lookup (CACHE_DEVBUF, CCKD_CACHE_SETKEY(dev->devnum, trk), &lru);
/* check for cache hit */
if (fnd >= 0)
{
if (ra) /* readahead doesn't care about a cache hit */
{ cache_unlock (CACHE_DEVBUF);
return fnd;
}
/* Mark the new entry active */
cache_setflag(CACHE_DEVBUF, fnd, ~0, CCKD_CACHE_ACTIVE | CCKD_CACHE_USED);
cache_setage(CACHE_DEVBUF, fnd);
/* If the entry is pending write then change it to `updated' */
if (cache_getflag(CACHE_DEVBUF, fnd) & CCKD_CACHE_WRITE)
{
cache_setflag(CACHE_DEVBUF, fnd, ~CCKD_CACHE_WRITE, CCKD_CACHE_UPDATED);
cckd->wrpending--;
if (cckd->cckdwaiters && !cckd->wrpending)
broadcast_condition (&cckd->cckdiocond);
}
buf = cache_getbuf(CACHE_DEVBUF, fnd, 0);
cache_unlock (CACHE_DEVBUF);