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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
*
* Copyright (C) 1997 University of Chicago.
* See COPYRIGHT notice in top-level directory.
*/
#include "ad_xfs.h"
#ifdef HAVE_MALLOC_H
#include <malloc.h>
#endif
/* style: allow:free:2 sig:0 */
static int ADIOI_XFS_Aligned_Mem_File_Write(ADIO_File fd, void *buf,
ADIO_Offset len, ADIO_Offset offset);
void ADIOI_XFS_WriteContig(ADIO_File fd, void *buf, int count,
MPI_Datatype datatype, int file_ptr_type,
ADIO_Offset offset, ADIO_Status *status, int *error_code)
{
int diff, size;
MPI_Count err=-1, datatype_size;
ssize_t len;
void *newbuf;
static char myname[] = "ADIOI_XFS_WRITECONTIG";
MPI_Type_size_x(datatype, &datatype_size);
len = datatype_size * count;
fd->fp_sys_posn = -1; /* set it to null, since we are using pwrite */
if (file_ptr_type == ADIO_INDIVIDUAL) offset = fd->fp_ind;
if (!(fd->direct_write)) { /* direct I/O not enabled */
err = pwrite(fd->fd_sys, buf, len, offset);
if (err < 0) {goto leaving;}
} else { /* direct I/O enabled */
/* (1) if mem_aligned && file_aligned
use direct I/O to write up to correct io_size
use buffered I/O for remaining */
if (!(((long) buf) % fd->d_mem) && !(offset % fd->d_miniosz)) {
err = ADIOI_XFS_Aligned_Mem_File_Write(fd, buf, len, offset);
if (err < 0) {goto leaving;}
/* (2) if !file_aligned
use buffered I/O to write up to file_aligned
At that point, if still mem_aligned, use (1)
else copy into aligned buf and then use (1) */
} else if (offset % fd->d_miniosz) {
diff = fd->d_miniosz - (offset % fd->d_miniosz);
diff = ADIOI_MIN(diff, len);
err = pwrite(fd->fd_sys, buf, diff, offset);
if (err < 0) {goto leaving;}
buf = ((char *) buf) + diff;
offset += diff;
size = len - diff;
if (!(((long) buf) % fd->d_mem)) {
err = ADIOI_XFS_Aligned_Mem_File_Write(fd, buf, size, offset);
if (err < 0) {goto leaving;}
}
else {
newbuf = (void *) memalign(XFS_MEMALIGN, size);
if (newbuf) {
memcpy(newbuf, buf, size);
err = ADIOI_XFS_Aligned_Mem_File_Write(fd, newbuf, size, offset);
ADIOI_Free(newbuf);
if (err < 0) {goto leaving;}
} else {
err = pwrite(fd->fd_sys, buf, size, offset);
if (err < 0) {goto leaving;}
}
}
}
/* (3) if !mem_aligned && file_aligned
copy into aligned buf, then use (1) */
else {
newbuf = (void *) memalign(XFS_MEMALIGN, len);
if (newbuf) {
memcpy(newbuf, buf, len);
err = ADIOI_XFS_Aligned_Mem_File_Write(fd, newbuf, len, offset);
ADIOI_Free(newbuf);
} else {
err = pwrite(fd->fd_sys, buf, len, offset);
}
if (err < 0) {goto leaving;}
}
}
if (file_ptr_type == ADIO_INDIVIDUAL) fd->fp_ind += len;
#ifdef HAVE_STATUS_SET_BYTES
if (err != -1) MPIR_Status_set_bytes(status, datatype, len);
#endif
leaving:
if (err == -1) {
*error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
myname, __LINE__, MPI_ERR_IO, "**io",
"**io %s", strerror(errno));
}
else *error_code = MPI_SUCCESS;
}
static int
ADIOI_XFS_Aligned_Mem_File_Write(ADIO_File fd, void *buf, ADIO_Offset len,
ADIO_Offset offset)
{
unsigned write_chunk_sz = fd->hints->fs_hints.xfs.write_chunk_sz;
ADIO_Offset nbytes, rem, newrem, size;
int ntimes, i;
/* memory buffer is aligned, offset in file is aligned,
io_size may or may not be of the right size.
use direct I/O to write up to correct io_size,
use buffered I/O for remaining. */
if (!(len % fd->d_miniosz) &&
(len >= fd->d_miniosz) && (len <= write_chunk_sz)) {
nbytes = pwrite(fd->fd_direct, buf, len, offset);
if (nbytes < 0) {return -1;}
} else if (len < fd->d_miniosz) {
nbytes = pwrite(fd->fd_sys, buf, len, offset);
if (nbytes < 0) {return -1;}
} else if (len > write_chunk_sz) {
ntimes = len/(write_chunk_sz);
rem = len - ntimes * write_chunk_sz;
nbytes = 0;
for (i=0; i<ntimes; i++) {
nbytes = pwrite(fd->fd_direct, ((char *)buf) + i * write_chunk_sz,
write_chunk_sz, offset);
offset += write_chunk_sz;
if (nbytes < 0) {return -1;}
}
if (rem) {
if (!(rem % fd->d_miniosz)) {
nbytes = pwrite(fd->fd_direct,
((char *)buf) + ntimes * write_chunk_sz, rem, offset);
if (nbytes < 0) {return -1;}
} else {
newrem = rem % fd->d_miniosz;
size = rem - newrem;
if (size) {
nbytes = pwrite(fd->fd_direct,
((char *)buf) + ntimes * write_chunk_sz, size, offset);
offset += size;
if (nbytes < 0) {return -1;}
}
nbytes = pwrite(fd->fd_sys,
((char *)buf) + ntimes * write_chunk_sz + size, newrem, offset);
if (nbytes < 0) {return -1;}
}
}
}
else {
rem = len % fd->d_miniosz;
size = len - rem;
nbytes = pwrite(fd->fd_direct, buf, size, offset);
if (nbytes < 0) {return -1;}
nbytes = pwrite(fd->fd_sys, (char *)buf + size, rem, offset+size);
if (nbytes < 0) {return -1;}
}
return 0;
}
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