Lustre 1.6 Operations Manual

if (close(fd) < 0) {
fprintf(stderr, "File close failed: %d (%s)\n", errno,
strerror(errno));
return -1;
}
return 0;
}
int write_file(int fd)
{
char *stng = DUMWORD;
int cnt = 0;
for( cnt = 0; cnt < FILESIZE; cnt++) {
write(fd, stng, sizeof(stng));
}
return 0;
}
/* Open a file, set a specific stripe count, size and starting OST
Adjust the parameters to suit */
int open_stripe_file()
{
char *tfile = TESTFILE;
int stripe_size = 65536; /* System default is 4M */
int stripe_offset = -1; /* Start at default */
int stripe_count = MY_STRIPE_WIDTH; /*Single stripe for this
demo*/
int stripe_pattern = 0;
/* only RAID 0 at this time
*/
int rc, fd;
/*
*/
rc = llapi_file_create(tfile,
stripe_size,stripe_offset,stripe_count,stripe_pattern);
/* result code is inverted, we may return -EINVAL or an ioctl error.
We borrow an error message from sanity.c
*/
if (rc) {
fprintf(stderr,"llapi_file_create failed: %d (%s) \n", rc,
strerror(-rc));
return -1;
}
/* llapi_file_create closes the file descriptor, we must re-open */
fd = open(tfile, O_CREAT | O_RDWR | O_LOV_DELAY_CREATE, 0644);
if (fd < 0) {
fprintf(stderr, "Can't open %s file: %d (%s)\n", tfile, errno,
strerror(errno));
return -1;
}
return fd;
}
/* output a list of uuids for this file */
Chapter 25 Striping and I/O Options 25-13