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block.c
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/***************************************************************************
*
* Copyright (c) 1997-2022 Jeff V. Merkey
* 7260 SE Tenino St.
* Portland, Oregon 97206
* jeffmerkey@gmail.com
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the Lesser GNU Public License as published by the
* Free Software Foundation, version 2.1, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* Original Authorship :
* source code written by Jeff V. Merkey
*
* Original Contributors :
* Jeff V. Merkey
*
*
*
****************************************************************************
*
*
* AUTHORS : Jeff V. Merkey (jeffmerkey@gmail.com)
* FILE : BLOCK.C
* DESCRIP : Block Device Interface Module
* DATE : December 2, 1998
*
*
***************************************************************************/
#include "globals.h"
BYTE *ZeroBuffer = 0;
#if (FILE_DISK_EMULATION)
void SyncDevice(ULONG disk)
{
return;
}
uint32 pReadDiskSectors(
uint32 disk_id,
uint32 sector_offset,
uint8 *buffer,
uint32 sector_count,
uint32 extra)
{
#if (MULTI_MACHINE_EMULATION)
m2machine *machine;
NWDISK **SystemDisk;
m2group_get_context(&machine);
SystemDisk = (NWDISK **) &machine->LSystemDisk;
#endif
if (extra) {};
if (SystemDisk[disk_id] != 0)
{
fseek((FILE *) SystemDisk[disk_id]->PhysicalDiskHandle, sector_offset * 512, 0);
return (fread(buffer, 512, sector_count, (FILE *) SystemDisk[disk_id]->PhysicalDiskHandle));
}
return(0);
}
uint32 pWriteDiskSectors(
uint32 disk_id,
uint32 sector_offset,
uint8 *buffer,
uint32 sector_count,
uint32 extra)
{
#if (MULTI_MACHINE_EMULATION)
m2machine *machine;
NWDISK **SystemDisk;
m2group_get_context(&machine);
SystemDisk = (NWDISK **) &machine->LSystemDisk;
#endif
if (extra) {};
if (SystemDisk[disk_id] != 0)
{
fseek((FILE *) SystemDisk[disk_id]->PhysicalDiskHandle, sector_offset * 512, 0);
return (fwrite(buffer, 512, sector_count, (FILE *) SystemDisk[disk_id]->PhysicalDiskHandle));
}
return(0);
}
ULONG pZeroFillDiskSectors(
uint32 disk_id,
uint32 sector_offset,
uint32 sector_count,
uint32 extra)
{
#if (MULTI_MACHINE_EMULATION)
m2machine *machine;
NWDISK **SystemDisk;
m2group_get_context(&machine);
SystemDisk = (NWDISK **) &machine->LSystemDisk;
#endif
if (extra) {};
if (SystemDisk[disk_id] != 0)
{
fseek((FILE *) SystemDisk[disk_id]->PhysicalDiskHandle, sector_offset * 512, 0);
return (fwrite(ZeroBuffer, 512, sector_count, (FILE *) SystemDisk[disk_id]->PhysicalDiskHandle));
}
return(0);
}
ULONG ReadDiskSectors(ULONG disk, ULONG LBA, BYTE *Sector,
ULONG sectors, ULONG readAhead)
{
return (pReadDiskSectors(disk, LBA, Sector, sectors, readAhead));
}
ULONG WriteDiskSectors(ULONG disk, ULONG LBA, BYTE *Sector,
ULONG sectors, ULONG readAhead)
{
return (pWriteDiskSectors(disk, LBA, Sector, sectors, readAhead));
}
ULONG ZeroFillDiskSectors(ULONG disk, ULONG StartingLBA,
ULONG sectors, ULONG readAhead)
{
return (pZeroFillDiskSectors(disk, StartingLBA, sectors, readAhead));
}
#else
#if (LINUX_20 | LINUX_22 | LINUX_24)
extern ULONG insert_io(ULONG disk, ASYNCH_IO *io);
extern void RunAsynchIOQueue(ULONG disk);
extern void profile_complete(void);
void insert_callback(ASYNCH_IO *io);
#if (LINUX_24)
DECLARE_WAIT_QUEUE_HEAD(wait_for_bh);
#elif (LINUX_20 | LINUX_22)
struct wait_queue *wait_for_bh = NULL;
#endif
#if (LINUX_22 | LINUX_24)
kmem_cache_t *bh_p = 0;
#endif
//
// low level disk sector interface routines
//
#define AIO_SIGNATURE (ULONG)"AIOD"
struct buffer_head *bh_head = 0;
struct buffer_head *bh_tail = 0;
ULONG bh_count = 0;
ULONG bh_waiters = 0;
#if (LINUX_SLEEP)
#if (LINUX_SPIN)
spinlock_t bh_spinlock = SPIN_LOCK_UNLOCKED;
long bh_flags = 0;
#else
NWFSInitMutex(bh_semaphore);
#endif
#endif
void lock_bh_free(void)
{
#if (LINUX_SLEEP)
#if (LINUX_SPIN)
spin_lock_irqsave(&bh_spinlock, bh_flags);
#else
if (WaitOnSemaphore(&bh_semaphore) == -EINTR)
NWFSPrint("lock bh was interrupted\n");
#endif
#endif
}
void unlock_bh_free(void)
{
#if (LINUX_SLEEP)
#if (LINUX_SPIN)
spin_unlock_irqrestore(&bh_spinlock, bh_flags);
#else
SignalSemaphore(&bh_semaphore);
#endif
#endif
}
void nwfs_put_bh(struct buffer_head *bh)
{
lock_bh_free();
if (!bh_head)
{
bh_head = bh_tail = bh;
bh->b_next_free = bh->b_prev_free = 0;
}
else
{
bh_tail->b_next_free = bh;
bh->b_next_free = 0;
bh->b_prev_free = bh_tail;
bh_tail = bh;
}
unlock_bh_free();
// wake up any waiters
wake_up(&wait_for_bh);
return;
}
struct buffer_head *int_get_bh(void)
{
struct buffer_head *bh;
lock_bh_free();
if (bh_head)
{
bh = bh_head;
bh_head = bh->b_next_free;
if (bh_head)
bh_head->b_prev_free = NULL;
else
bh_tail = NULL;
bh->b_next_free = bh->b_prev_free = 0;
unlock_bh_free();
return bh;
}
else
if (bh_count < MAX_BUFFER_HEADS)
{
unlock_bh_free();
#if (LINUX_20)
bh = (struct buffer_head *)kmalloc(sizeof(struct buffer_head),
GFP_ATOMIC);
BH_TRACKING.count += sizeof(struct buffer_head);
BH_TRACKING.units++;
MemoryInUse += sizeof(struct buffer_head);
#elif (LINUX_22 | LINUX_24)
bh = (struct buffer_head *)kmem_cache_alloc(bh_p, SLAB_KERNEL);
BH_TRACKING.count += sizeof(struct buffer_head);
BH_TRACKING.units++;
MemoryInUse += sizeof(struct buffer_head);
#else
bh = (struct buffer_head *)NWFSIOAlloc(sizeof(struct buffer_head), BH_TAG);
#endif
if (!bh)
return 0;
bh_count++;
NWFSSet(bh, 0, sizeof(struct buffer_head));
#if (LINUX_24)
init_waitqueue_head(&bh->b_wait);
#endif
return bh;
}
unlock_bh_free();
return 0;
}
void free_bh_list(void)
{
struct buffer_head *bh;
lock_bh_free();
while (bh_head)
{
bh = bh_head;
bh_head = bh->b_next_free;
#if (LINUX_20)
kfree(bh);
BH_TRACKING.count -= sizeof(struct buffer_head);
BH_TRACKING.units--;
MemoryInUse -= sizeof(struct buffer_head);
#elif (LINUX_22 | LINUX_24)
if (bh_p)
{
kmem_cache_free(bh_p, bh);
BH_TRACKING.count -= sizeof(struct buffer_head);
BH_TRACKING.units--;
MemoryInUse -= sizeof(struct buffer_head);
}
#else
NWFSFree(bh);
#endif
}
bh_head = bh_tail = 0;
#if (LINUX_22 | LINUX_24)
if (bh_p)
{
kmem_cache_shrink(bh_p);
#if (LINUX_24)
kmem_cache_destroy(bh_p);
#endif
}
bh_p = 0;
#endif
bh_count = 0;
unlock_bh_free();
return;
}
struct buffer_head *__get_bh_wait(void)
{
struct buffer_head *bh;
#if (LINUX_20 | LINUX_22)
struct wait_queue wait = { current, NULL };
#elif (LINUX_24)
DECLARE_WAITQUEUE(wait, current);
#endif
#if (LINUX_20 | LINUX_22)
add_wait_queue(&wait_for_bh, &wait);
#elif (LINUX_24)
add_wait_queue_exclusive(&wait_for_bh, &wait);
#endif
for (;;)
{
current->state = TASK_UNINTERRUPTIBLE;
bh = int_get_bh();
if (bh)
break;
#if (!POST_IMMEDIATE)
#if (LINUX_22)
lock_kernel();
#endif
run_task_queue(&tq_disk);
#if (LINUX_22)
unlock_kernel();
#endif
#endif
bh_waiters++;
schedule();
bh_waiters--;
}
remove_wait_queue(&wait_for_bh, &wait);
current->state = TASK_RUNNING;
return bh;
}
struct buffer_head *nwfs_get_bh(void)
{
struct buffer_head *bh;
#if (LINUX_22 | LINUX_24)
if (!bh_p)
{
bh_p = kmem_cache_create("nwfs_buffer_head", sizeof(struct buffer_head),
0, SLAB_HWCACHE_ALIGN, NULL, NULL);
if (!bh_p)
{
NWFSPrint("Cannot create buffer head SLAB cache\n");
unlock_bh_free();
return 0;
}
}
#endif
bh = int_get_bh();
if (bh)
return bh;
return __get_bh_wait();
}
#if (LINUX_BUFFER_CACHE)
//
// The 2.2.X buffer cache is not SMP thread safe,
// so lock the kernel when we enter it to prevent memory corruption
// from occurring on SMP systems.
//
ULONG pReadDiskSectors(ULONG disk, ULONG StartingLBA, BYTE *Sector,
ULONG sectors, ULONG readAhead)
{
register ULONG i, bytesRead = 0;
register ULONG bps, lba;
register NWDISK *NWDisk;
register ULONG read_error = 0;
register ULONG rsize, blocks, blocksize, spb;
struct buffer_head *bh[sectors];
NWDisk = SystemDisk[disk];
bps = NWDisk->BytesPerSector;
blocksize = NWDisk->DeviceBlockSize;
#if (VERBOSE)
NWFSPrint("read disk-%d lba-%d for %d sectors\n",
(int)disk, (int)StartingLBA, (int)sectors);
#endif
rsize = sectors * bps;
blocks = rsize / blocksize;
if (!blocks)
return 0;
spb = blocksize / bps;
lba = StartingLBA / spb;
if (StartingLBA % spb)
{
NWFSPrint("request not %d block aligned (%d) sectors-%d lba-%d (read-bc)\n",
(int)blocksize, (int)(StartingLBA % spb), (int)sectors,
(int)StartingLBA);
return 0;
}
#if (LINUX_22)
lock_kernel();
#endif
for (i=0; i < blocks; i++)
{
if (!(bh[i] = getblk((ULONG)NWDisk->PhysicalDiskHandle,
lba + i, blocksize)))
{
for (i=0; i < blocks; i++)
if (bh[i])
brelse(bh[i]);
#if (LINUX_22)
unlock_kernel();
#endif
return 0;
}
}
#if (DUMP_BUFFER_HEADS)
if (1)
{
for (i=0; i < blocks; i++)
{
NWFSPrint("getblk buffer head (read) %d-0x%08X\n", (int)i,
(unsigned)bh[i]);
dumpRecordBytes(bh[i], sizeof(struct buffer_head));
dumpRecord(bh[i], sizeof(struct buffer_head));
}
#if (LINUX_22)
unlock_kernel();
#endif
return 0;
}
#endif
ll_rw_block(READ, blocks, bh);
for(i=0; i < blocks; i++)
{
wait_on_buffer(bh[i]);
if (buffer_uptodate(bh[i]))
{
NWFSCopy(&Sector[i * blocksize], bh[i]->b_data, blocksize);
bytesRead += blocksize;
}
else
{
NWFSPrint("read error %d of %d bytes read %d blksize-%d\n",
(int)i, (int)blocks, (int)bytesRead,
(int)blocksize);
read_error = 1;
}
brelse(bh[i]);
}
#if (LINUX_22)
unlock_kernel();
#endif
#if (PROFILE_AIO)
profile_complete();
#endif
return (read_error ? 0 : bytesRead);
}
ULONG pWriteDiskSectors(ULONG disk, ULONG StartingLBA, BYTE *Sector,
ULONG sectors, ULONG readAhead)
{
register ULONG i, bytesWritten = 0;
register ULONG bps, lba;
struct buffer_head *bh[sectors];
register ULONG write_error = 0;
register ULONG rsize, blocks, blocksize, spb;
register NWDISK *NWDisk;
NWDisk = SystemDisk[disk];
bps = NWDisk->BytesPerSector;
blocksize = NWDisk->DeviceBlockSize;
#if (VERBOSE)
NWFSPrint("write disk-%d lba-%d for %d sectors\n",
(int)disk, (int)StartingLBA, (int)sectors);
#endif
rsize = sectors * bps;
blocks = rsize / blocksize;
if (!blocks)
return 0;
spb = blocksize / bps;
lba = StartingLBA / spb;
if (StartingLBA % spb)
{
NWFSPrint("request not %d block aligned (%d) sectors-%d lba-%d (write-bc)\n",
(int)blocksize, (int)(StartingLBA % spb), (int)sectors,
(int)StartingLBA);
return 0;
}
#if (LINUX_22)
lock_kernel();
#endif
for (i=0; i < blocks; i++)
{
if (!(bh[i] = getblk((ULONG)NWDisk->PhysicalDiskHandle,
lba + i, blocksize)))
{
for (i=0; i < blocks; i++)
if (bh[i])
brelse(bh[i]);
#if (LINUX_22)
unlock_kernel();
#endif
return 0;
}
NWFSCopy(bh[i]->b_data, &Sector[i * blocksize], blocksize);
mark_buffer_uptodate(bh[i], 1);
#if (LINUX_24)
mark_buffer_dirty(bh[i]);
#else
mark_buffer_dirty(bh[i], 0);
#endif
bytesWritten += blocksize;
}
#if (DUMP_BUFFER_HEADS)
if (1)
{
for (i=0; i < blocks; i++)
{
NWFSPrint("getblk buffer head (write) %d-0x%08X\n", (int)i,
(unsigned)bh[i]);
dumpRecordBytes(bh[i], sizeof(struct buffer_head));
dumpRecord(bh[i], sizeof(struct buffer_head));
}
#if (LINUX_22)
unlock_kernel();
#endif
return 0;
}
#endif
ll_rw_block(WRITE, blocks, bh);
for (i=0; i < blocks; i++)
{
wait_on_buffer(bh[i]);
if (!buffer_uptodate(bh[i]))
write_error = 1;
brelse(bh[i]);
}
#if (LINUX_22)
unlock_kernel();
#endif
#if (PROFILE_AIO)
profile_complete();
#endif
return (write_error ? 0 : bytesWritten);
}
ULONG pZeroFillDiskSectors(ULONG disk, ULONG StartingLBA, ULONG sectors,
ULONG readAhead)
{
register ULONG i, bytesWritten = 0;
register ULONG bps, lba;
struct buffer_head *bh[sectors];
register ULONG write_error = 0;
register ULONG rsize, blocks, blocksize, spb;
register NWDISK *NWDisk;
NWDisk = SystemDisk[disk];
bps = NWDisk->BytesPerSector;
blocksize = NWDisk->DeviceBlockSize;
#if (VERBOSE)
NWFSPrint("zero disk-%d lba-%d for %d sectors\n",
(int)disk, (int)StartingLBA, (int)sectors);
#endif
rsize = sectors * bps;
blocks = rsize / blocksize;
if (!blocks)
return 0;
spb = blocksize / bps;
lba = StartingLBA / spb;
if (StartingLBA % spb)
{
NWFSPrint("request not %d block aligned (%d) sectors-%d lba-%d (fill-bc)\n",
(int)blocksize, (int)(StartingLBA % spb), (int)sectors,
(int)StartingLBA);
return 0;
}
#if (LINUX_22)
lock_kernel();
#endif
for (i=0; i < blocks; i++)
{
if (!(bh[i] = getblk((ULONG)NWDisk->PhysicalDiskHandle,
lba + i, blocksize)))
{
for (i=0; i < blocks; i++)
if (bh[i])
brelse(bh[i]);
#if (LINUX_22)
unlock_kernel();
#endif
return 0;
}
NWFSSet(bh[i]->b_data, 0, blocksize);
mark_buffer_uptodate(bh[i], 1);
#if (LINUX_24)
mark_buffer_dirty(bh[i]);
#else
mark_buffer_dirty(bh[i], 0);
#endif
bytesWritten += blocksize;
}
#if (DUMP_BUFFER_HEADS)
if (1)
{
for (i=0; i < blocks; i++)
{
NWFSPrint("getblk buffer head (fill) %d-0x%08X\n", (int)i,
(unsigned)bh[i]);
dumpRecordBytes(bh[i], sizeof(struct buffer_head));
dumpRecord(bh[i], sizeof(struct buffer_head));
}
#if (LINUX_22)
unlock_kernel();
#endif
return 0;
}
#endif
ll_rw_block(WRITE, blocks, bh);
for (i=0; i < blocks; i++)
{
wait_on_buffer(bh[i]);
if (!buffer_uptodate(bh[i]))
write_error = 1;
brelse(bh[i]);
}
#if (LINUX_22)
unlock_kernel();
#endif
#if (PROFILE_AIO)
profile_complete();
#endif
return (write_error ? 0 : bytesWritten);
}
#else
//
// this case assumes we will use the NWFS buffer cache and not allow
// cache sharing with the linux buffer cache.
//
//
// Linux 2.0
//
#if (LINUX_20)
ULONG pReadDiskSectors(ULONG disk, ULONG StartingLBA, BYTE *Sector,
ULONG sectors, ULONG readAhead)
{
register ULONG i, j, bytesRead = 0;
register ULONG bps, lba;
register NWDISK *NWDisk;
register ULONG read_error = 0;
register ULONG rsize, blocks, blocksize, spb;
struct buffer_head *bh[sectors];
NWDisk = SystemDisk[disk];
bps = NWDisk->BytesPerSector;
blocksize = NWDisk->DeviceBlockSize;
rsize = sectors * bps;
blocks = rsize / blocksize;
if (!blocks)
return 0;
spb = blocksize / bps;
lba = StartingLBA / spb;
if (StartingLBA % spb)
{
NWFSPrint("request not %d block aligned (%d) sectors-%d lba-%d (read)\n",
(int)blocksize, (int)(StartingLBA % spb), (int)sectors,
(int)StartingLBA);
return 0;
}
for (i=0; i < blocks; i++)
{
bh[i] = nwfs_get_bh();
if (!bh[i])
{
for (j=0; j < i; j++)
if (bh[j])
nwfs_put_bh(bh[j]);
return 0;
}
}
for (i=0; i < blocks; i++)
{
bh[i]->b_this_page = bh[(i + 1) % blocks]; // create circular list
bh[i]->b_state = 0;
bh[i]->b_next_free = (struct buffer_head *)NULL;
bh[i]->b_size = blocksize;
bh[i]->b_data = (char *)&Sector[i * blocksize];
bh[i]->b_list = BUF_CLEAN;
bh[i]->b_dev = (int)NWDisk->PhysicalDiskHandle;
bh[i]->b_blocknr = lba + i;
bh[i]->b_count = 1;
bh[i]->b_flushtime = 0;
clear_bit(BH_Uptodate, &bh[i]->b_state);
}
ll_rw_block(READ, blocks, bh);
for(i=0; i < blocks; i++)
{
wait_on_buffer(bh[i]);
if (buffer_uptodate(bh[i]))
bytesRead += blocksize;
else
read_error = 1;
nwfs_put_bh(bh[i]);
}
#if (PROFILE_AIO)
profile_complete();
#endif
return (read_error ? 0 : bytesRead);
}
ULONG pWriteDiskSectors(ULONG disk, ULONG StartingLBA, BYTE *Sector,
ULONG sectors, ULONG readAhead)
{
register ULONG i, j, bytesWritten = 0;
register ULONG bps, lba;
register ULONG write_error = 0;
register ULONG rsize, blocks, blocksize, spb;
register NWDISK *NWDisk;
struct buffer_head *bh[sectors];
NWDisk = SystemDisk[disk];
bps = NWDisk->BytesPerSector;
blocksize = NWDisk->DeviceBlockSize;
rsize = sectors * bps;
blocks = rsize / blocksize;
if (!blocks)
return 0;
spb = blocksize / bps;
lba = StartingLBA / spb;
if (StartingLBA % spb)
{
NWFSPrint("request not %d block aligned (%d) sectors-%d lba-%d (read)\n",
(int)blocksize, (int)(StartingLBA % spb), (int)sectors,
(int)StartingLBA);
return 0;
}
for (i=0; i < blocks; i++)
{
bh[i] = nwfs_get_bh();
if (!bh[i])
{
for (j=0; j < i; j++)
if (bh[j])
nwfs_put_bh(bh[j]);
return 0;
}
}
for (i=0; i < blocks; i++)
{
bh[i]->b_this_page = bh[(i + 1) % blocks]; // create circular list
bh[i]->b_state = 0;
bh[i]->b_next_free = (struct buffer_head *) NULL;
bh[i]->b_size = blocksize;
bh[i]->b_data = (char *)&Sector[i * blocksize];
bh[i]->b_list = BUF_CLEAN;
bh[i]->b_dev = (int)NWDisk->PhysicalDiskHandle;
bh[i]->b_blocknr = lba + i;
bh[i]->b_count = 1;
bh[i]->b_flushtime = 0;
set_bit(BH_Uptodate, &bh[i]->b_state);
set_bit(BH_Dirty, &bh[i]->b_state);
}
ll_rw_block(WRITE, blocks, bh);
for (i=0; i < blocks; i++)
{
wait_on_buffer(bh[i]);
if (buffer_uptodate(bh[i]))
bytesWritten += blocksize;
else
write_error = 1;
nwfs_put_bh(bh[i]);
}
#if (PROFILE_AIO)
profile_complete();
#endif
return (write_error ? 0 : bytesWritten);
}
ULONG pZeroFillDiskSectors(ULONG disk, ULONG StartingLBA, ULONG sectors,
ULONG readAhead)
{
register ULONG i, j, bytesWritten = 0;
register ULONG bps, lba;
register ULONG write_error = 0;
register ULONG rsize, blocks, blocksize, spb;
register NWDISK *NWDisk;
struct buffer_head *bh[sectors];
NWDisk = SystemDisk[disk];
bps = NWDisk->BytesPerSector;
blocksize = NWDisk->DeviceBlockSize;
rsize = sectors * bps;
blocks = rsize / blocksize;
if (!blocks)
return 0;
spb = blocksize / bps;
lba = StartingLBA / spb;
if (StartingLBA % spb)
{
NWFSPrint("request not %d block aligned (%d) sectors-%d lba-%d (read)\n",
(int)blocksize, (int)(StartingLBA % spb), (int)sectors,
(int)StartingLBA);
return 0;
}
for (i=0; i < blocks; i++)
{
bh[i] = nwfs_get_bh();
if (!bh[i])
{
for (j=0; j < i; j++)
if (bh[j])
nwfs_put_bh(bh[j]);
return 0;
}
}
for (i=0; i < blocks; i++)
{
bh[i]->b_this_page = bh[(i + 1) % blocks]; // create circular list
bh[i]->b_state = 0;
bh[i]->b_next_free = (struct buffer_head *) NULL;
bh[i]->b_size = blocksize;
bh[i]->b_data = (char *) ZeroBuffer;
bh[i]->b_list = BUF_CLEAN;
bh[i]->b_dev = (int)NWDisk->PhysicalDiskHandle;
bh[i]->b_blocknr = lba + i;
bh[i]->b_count = 1;
bh[i]->b_flushtime = 0;
set_bit(BH_Uptodate, &bh[i]->b_state);
set_bit(BH_Dirty, &bh[i]->b_state);
}
ll_rw_block(WRITE, blocks, bh);
for (i=0; i < blocks; i++)
{
wait_on_buffer(bh[i]);
if (buffer_uptodate(bh[i]))
bytesWritten += blocksize;
else
write_error = 1;
nwfs_put_bh(bh[i]);
}
#if (PROFILE_AIO)
profile_complete();
#endif
return (write_error ? 0 : bytesWritten);
}
#endif
//
// Linux 2.2
//
#if (LINUX_22)
void end_io(struct buffer_head *bh, int uptodate)
{
mark_buffer_uptodate(bh, uptodate);
unlock_buffer(bh);
return;
}
ULONG pReadDiskSectors(ULONG disk, ULONG StartingLBA, BYTE *Sector,
ULONG sectors, ULONG readAhead)
{
register ULONG i, j, bytesRead = 0;
register ULONG bps, lba;
register NWDISK *NWDisk;
register ULONG read_error = 0;
register ULONG rsize, blocks, blocksize, spb;
struct buffer_head *bh[sectors];
NWDisk = SystemDisk[disk];
bps = NWDisk->BytesPerSector;
blocksize = NWDisk->DeviceBlockSize;
rsize = sectors * bps;
blocks = rsize / blocksize;
if (!blocks)
return 0;
spb = blocksize / bps;
lba = StartingLBA / spb;
if (StartingLBA % spb)
{
NWFSPrint("request not %d block aligned (%d) sectors-%d lba-%d (read)\n",
(int)blocksize, (int)(StartingLBA % spb), (int)sectors,
(int)StartingLBA);
return 0;
}
for (i=0; i < blocks; i++)
{
bh[i] = nwfs_get_bh();
if (!bh[i])
{
for (j=0; j < i; j++)
if (bh[j])
nwfs_put_bh(bh[j]);
return 0;
}
}
for (i=0; i < blocks; i++)
{
bh[i]->b_this_page = bh[(i + 1) % blocks]; // create circular list
bh[i]->b_state = 0;
bh[i]->b_next_free = (struct buffer_head *)NULL;
bh[i]->b_size = blocksize;
bh[i]->b_data = (char *)&Sector[i * blocksize];
bh[i]->b_list = BUF_CLEAN;
bh[i]->b_dev = (int)NWDisk->PhysicalDiskHandle;
bh[i]->b_blocknr = lba + i;
bh[i]->b_count = 1;