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cckddasd.c
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cckddasd.c
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/* CCKDDASD.C (c) Copyright Roger Bowler, 1999-2004 */
/* ESA/390 Compressed CKD Direct Access Storage Device Handler */
/*-------------------------------------------------------------------*/
/* This module contains device functions for compressed emulated */
/* count-key-data direct access storage devices. */
/*-------------------------------------------------------------------*/
#include "hercules.h"
#include "devtype.h"
#include "opcode.h"
#define cckdtrc(format, a...) \
do { \
if (dev && (dev->ccwtrace||dev->ccwstep)) \
logmsg("%4.4X:" format, dev->devnum, a); \
if (cckdblk.itrace) { \
struct timeval tv; \
CCKD_TRACE *p; \
p = cckdblk.itracep++; \
if (p >= cckdblk.itracex) { \
p = cckdblk.itrace; \
cckdblk.itracep = p + 1; \
} \
gettimeofday(&tv, NULL); \
if (p) sprintf ((char *)p, "%6.6ld" "." "%6.6ld %4.4X:" format, \
tv.tv_sec, tv.tv_usec, dev ? dev->devnum : 0, a); \
} \
} while (0)
/*-------------------------------------------------------------------*/
/* Internal functions */
/*-------------------------------------------------------------------*/
int cckddasd_init(int argc, BYTE *argv[]);
int cckddasd_term();
int cckddasd_init_handler( DEVBLK *dev, int argc, BYTE *argv[] );
int cckddasd_close_device(DEVBLK *dev);
void cckddasd_start(DEVBLK *dev);
void cckddasd_end(DEVBLK *dev);
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 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();
int cckd_writer_scan(int *o, int ix, int i, void *data);
off_t cckd_get_space(DEVBLK *dev, unsigned int len);
void cckd_rel_space(DEVBLK *dev, off_t pos, int len);
void cckd_rel_free_atend(DEVBLK *dev, unsigned int pos, int len, int i);
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 cckd_harden(DEVBLK *dev);
int cckd_trklen(DEVBLK *dev, BYTE *buf);
void cckd_truncate(DEVBLK *dev, int now);
int cckd_null_trk(DEVBLK *dev, BYTE *buf, int trk, int sz0);
int cckd_cchh(DEVBLK *dev, BYTE *buf, int trk);
int cckd_validate(DEVBLK *dev, BYTE *buf, int trk, int len);
int cckd_sf_name(DEVBLK *dev, int sfx, char *sfn);
int cckd_sf_init(DEVBLK *dev);
int cckd_sf_new(DEVBLK *dev);
void cckd_sf_add(DEVBLK *dev);
void cckd_sf_remove(DEVBLK *dev, int merge);
void cckd_sf_newname(DEVBLK *dev, BYTE *sfn);
void cckd_sf_comp(DEVBLK *dev);
void cckd_sf_stats(DEVBLK *dev);
int cckd_disable_syncio(DEVBLK *dev);
void cckd_lock_devchain(int flag);
void cckd_unlock_devchain();
void cckd_gcol();
int cckd_gc_percolate(DEVBLK *dev, unsigned int size);
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(BYTE *op, int cmd);
void cckd_print_itrace();
/*-------------------------------------------------------------------*/
/* 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 BYTE cckd_empty_l2tab[CCKD_L2TAB_SIZE]; /* Empty L2 table */
static BYTE eighthexFF[] = {0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff};
DEVHND cckddasd_device_hndinfo;
DEVHND cfbadasd_device_hndinfo;
CCKDBLK cckdblk; /* cckd global area */
/*-------------------------------------------------------------------*/
/* CCKD global initialization */
/*-------------------------------------------------------------------*/
int cckddasd_init (int argc, BYTE *argv[])
{
int i; /* Index */
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;
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);
/* 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);
/* 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);
memset(&cckdblk, 0, sizeof(CCKDBLK));
return 0;
} /* end function cckddasd_term */
/*-------------------------------------------------------------------*/
/* CKD dasd initialization */
/*-------------------------------------------------------------------*/
int cckddasd_init_handler ( DEVBLK *dev, int argc, BYTE *argv[] )
{
CCKDDASD_EXT *cckd; /* -> cckd extension */
DEVBLK *dev2; /* -> device in cckd queue */
int rc; /* Return code */
int fdflags; /* File flags */
UNREFERENCED(argc);
UNREFERENCED(argv);
/* Obtain area for cckd extension */
dev->cckd_ext = cckd = malloc(sizeof(CCKDDASD_EXT));
if (cckd == NULL)
{
logmsg ("%4.4X:",dev->devnum); logmsg (_("HHCCD100E malloc failed for cckd extension: %s\n"),
strerror(errno));
return -1;
}
memset(cckd, 0, sizeof(CCKDDASD_EXT));
memset(&cckd_empty_l2tab, 0, CCKD_L2TAB_SIZE);
/* Initialize the global cckd block if necessary */
if (memcmp (&cckdblk.id, "CCKDBLK ", sizeof(cckdblk.id)))
cckddasd_init (0, NULL);
/* 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 = dev->cache = cckd->free1st = -1;
cckd->fd[0] = dev->fd;
fdflags = fcntl (dev->fd, F_GETFL);
cckd->open[0] = (fdflags & O_RDWR) ? CCKD_OPEN_RW : CCKD_OPEN_RO;
/* call the chkdsk function */
rc = cckd_chkdsk (cckd->fd[0], stdout, 0);
if (rc < 0) return -1;
/* Perform initial read */
rc = cckd_read_init (dev);
if (rc < 0) return -1;
if (cckd->fbadasd) dev->ckdtrksz = CFBA_BLOCK_SIZE;
/* open the shadow files */
rc = cckd_sf_init (dev);
if (rc < 0)
{ logmsg ("%4.4X:",dev->devnum); logmsg (_("HHCCD101E error initializing shadow files\n"));
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;
}
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);
}
cckd_purge_cache (dev); cckd_purge_l2 (dev);
dev->bufcur = dev->cache = -1;
if (cckd->newbuf) free (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++)
{
close (cckd->fd[i]);
cckd->open[i] = 0;
}
/* free the level 1 tables */
for (i = 0; i <= cckd->sfn; i++)
free (cckd->l1[i]);
/* write some statistics */
if (!dev->batch)
cckd_sf_stats (dev);
release_lock (&cckd->filelock);
/* free the cckd extension */
dev->cckd_ext= NULL;
free (cckd);
memset (&dev->dasdsfn, 0, sizeof(dev->dasdsfn));
close (dev->fd);
/* 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;
cckdtrc ("cckddasd: start i/o bufcur %d cache[%d]\n",
dev->bufcur, dev->cache);
/* Reset buffer offsets */
dev->bufoff = 0;
dev->bufoffhi = cckd->ckddasd ? dev->ckdtrksz : CFBA_BLOCK_SIZE;
/* Check for merge - synchronous i/o should be disabled */
obtain_lock(&cckd->iolock);
if (cckd->merging)
{
cckdtrc("cckddasd: start i/o waiting for merge%s\n","");
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;
cckdtrc ("cckddasd: end i/o bufcur %d cache[%d] waiters %d\n",
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 */
/*-------------------------------------------------------------------*/
/* 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 */
int syncio; /* Syncio indicator */
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);
}
/* 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;
/* 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)
{
/* Return if synchronous i/o */
if (dev->syncio_active)
{
cckdtrc ("cckddasd: read trk %d syncio compressed\n", trk);
cckdblk.stats_synciomisses++;
dev->syncio_retry = 1;
return -1;
}
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;
dev->syncio_active = 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;
cckdtrc ("cckddasd: read trk %d uncompressed len %d\n",
trk, dev->buflen);
}
dev->comp = dev->buf[0] & CCKD_COMPRESS_MASK;
if (dev->comp != 0) dev->compoff = CKDDASD_TRKHDR_SIZE;
return 0;
}
cckdtrc ("cckddasd: read trk %d (%s)\n", trk,
dev->syncio_active ? "synchronous" : "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;
dev->syncio_active = 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;
/* Immediately return if fake writing */
if (dev->ckdfakewr)
return len;
/* Error if opened read-only */
if (dev->ckdrdonly)
{
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);
cckdtrc ("cckddasd: updt trk %d offset %d length %d\n",
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 */
int sfx; /* Shadow file suffix */
CCKD_L2ENT l2; /* Copied level 2 entry */
cckd = dev->cckd_ext;
obtain_lock (&cckd->filelock);
/* Find the last used level 1 table entry */
for (l1x = cckd->cdevhdr[0].numl1tab - 1; l1x > 0; l1x--)
{
sfx = cckd->sfn;
while (cckd->l1[sfx][l1x] == 0xffffffff && sfx > 0) sfx--;
if (cckd->l1[sfx][l1x]) break;
}
/* Find the last used level 2 table entry */
for (l2x = 255; l2x >= 0; l2x--)
{
rc = cckd_read_l2ent (dev, &l2, l1x * 256 + l2x);
if (rc < 0 || l2.pos != 0) break;
}
release_lock (&cckd->filelock);
return (l1x * 256 + l2x + dev->ckdheads) / dev->ckdheads;
}
/*-------------------------------------------------------------------*/
/* Compressed fba read block(s) */
/*-------------------------------------------------------------------*/
int cfba_read_block (DEVBLK *dev, int blkgrp, BYTE *unitstat)
{
CCKDDASD_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_BLOCK_SIZE + CKDDASD_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)
{
/* Return if synchronous i/o */
if (dev->syncio_active)
{
cckdtrc ("cckddasd: read blkgrp %d syncio compressed\n",
blkgrp);
cckdblk.stats_synciomisses++;
dev->syncio_retry = 1;
return -1;
}
len = cache_getval(CACHE_DEVBUF, dev->cache);
newbuf = cckd_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 + CKDDASD_TRKHDR_SIZE;
dev->buflen = CFBA_BLOCK_SIZE;
cache_setval (CACHE_DEVBUF, dev->cache, dev->buflen);
dev->bufsize = cache_getlen (CACHE_DEVBUF, dev->cache);
dev->bufupd = 0;
cckdtrc ("cckddasd: read bkgrp %d uncompressed len %d\n",
blkgrp, dev->buflen);
}
dev->comp = cbuf[0] & CCKD_COMPRESS_MASK;
return 0;
}
cckdtrc ("cckddasd: read blkgrp %d (%s)\n", blkgrp,
dev->syncio_active ? "synchronous" : "asynchronous");
/* Read the new blkgrp */
dev->bufupd = 0;
*unitstat = 0;
cache = cckd_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 + CKDDASD_TRKHDR_SIZE;
dev->bufcur = blkgrp;
dev->bufoff = 0;
dev->bufoffhi = CFBA_BLOCK_SIZE;
dev->buflen = cache_getval (CACHE_DEVBUF, dev->cache);
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 = cfba_read_block (dev, blkgrp, unitstat);
else
rc = 0;
return rc;
} /* end function cfba_read_block */
/*-------------------------------------------------------------------*/
/* Compressed fba write block(s) */
/*-------------------------------------------------------------------*/
int cfba_write_block (DEVBLK *dev, int blkgrp, int off,
BYTE *buf, int len, BYTE *unitstat)
{
CCKDDASD_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 cfba_write_block */
/*-------------------------------------------------------------------*/
/* Return used blocks */
/*-------------------------------------------------------------------*/
int cfba_used (DEVBLK *dev)
{
CCKDDASD_EXT *cckd; /* -> cckd extension */
int rc; /* Return code */
int l1x, l2x; /* Lookup table indexes */
int sfx; /* Shadow file suffix */
CCKD_L2ENT l2; /* Copied level 2 entry */
cckd = dev->cckd_ext;
obtain_lock (&cckd->filelock);
/* Find the last used level 1 table entry */
for (l1x = cckd->cdevhdr[0].numl1tab - 1; l1x > 0; l1x--)
{
sfx = cckd->sfn;
while (cckd->l1[sfx][l1x] == 0xffffffff && sfx > 0) sfx--;
if (cckd->l1[sfx][l1x]) break;
}
/* Find the last used level 2 table entry */
for (l2x = 255; l2x >= 0; l2x--)
{
rc = cckd_read_l2ent (dev, &l2, l1x * 256 + l2x);
if (rc < 0 || l2.pos != 0) break;
}
release_lock (&cckd->filelock);
return (l1x * 256 + l2x + CFBA_BLOCK_NUM) / CFBA_BLOCK_NUM;
}
/*-------------------------------------------------------------------*/
/* 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 cckd_read_trk(DEVBLK *dev, int trk, int ra, BYTE *unitstat)
{
CCKDDASD_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 */
cckd = dev->cckd_ext;
cckdtrc ("cckddasd: %d rdtrk %d\n", ra, trk);
maxlen = cckd->ckddasd ? dev->ckdtrksz
: CFBA_BLOCK_SIZE + CKDDASD_TRKHDR_SIZE;
if (!ra) obtain_lock (&cckd->iolock);
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;
}
/* If synchronous I/O and I/O is active then return
with syncio_retry bit on */
if (dev->syncio_active)
{
if (cache_getflag(CACHE_DEVBUF, fnd) & CCKD_CACHE_IOBUSY)
{
cckdtrc ("cckddasd: %d rdtrk[%d] %d syncio %s\n", ra, fnd, trk,
cache_getflag(CACHE_DEVBUF, fnd) & CCKD_CACHE_READING ?
"reading" : "writing");
cckdblk.stats_synciomisses++;
dev->syncio_retry = 1;
cache_unlock (CACHE_DEVBUF);
release_lock (&cckd->iolock);
return -1;
}
else cckdblk.stats_syncios++;
}
/* 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->iowaiters && !cckd->wrpending)
broadcast_condition (&cckd->iocond);
}
cache_unlock (CACHE_DEVBUF);
cckdtrc ("cckddasd: %d rdtrk[%d] %d cache hit\n", ra, fnd, trk);
cckdblk.stats_switches++; cckd->switches++;
cckdblk.stats_cachehits++; cckd->cachehits++;
/* if read/write is in progress then wait for it to finish */