Attachment 299375 Details for Bug 438423 – reproducer program

reproducer program

write-error-test.c (text/plain), 1.95 KB, created by Jeff Layton on 2008-03-27 18:19:05 UTC

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Creator: Jeff Layton

Created: 2008-03-27 18:19:05 UTC

Size: 1.95 KB

patch

obsolete

>#include <stdio.h>
>#include <stdlib.h>
>#include <sys/types.h>
>#include <sys/stat.h>
>#include <fcntl.h>
>#include <errno.h>
>#include <unistd.h>
>#include <sys/vfs.h>
>
>#define BUFSZ 1024
>
>/*
> * write specified number of kbytes to given filename, and then do a
> * fsync to make sure the writes are flushed. Then, try to write 1k
> * more and check the return value to make sure it errors out. Should
> * be run with a number of kbytes which is more than the amount of
> * space on the destination filesystem
> */
>int
>main(int argc, char **argv)
>{
>	char *buf;
>	int fd, bytes, i, err;
>	ssize_t written;
>	struct statfs statfsbuf;
>
>	if (argc < 2) {
>		printf("Usage: %s filename\n", argv[0]);
>		return 1;
>	}
>
>	buf = calloc(1, BUFSZ);
>	if (buf == NULL) {
>		printf("calloc failed: %d\n", -ENOMEM);
>		return -ENOMEM;
>	}
>
>	fd = open(argv[1], O_WRONLY|O_CREAT|O_TRUNC, 0600);
>	if (fd < 0) {
>		printf("open failed: %d\n", -errno);
>		return -errno;
>	}
>
>	err = fstatfs(fd, &statfsbuf);
>	if (err < 0) {
>		printf("fstatfs failed: %d\n", -errno);
>		return -errno;
>	}
>
>	/* bytes of space left on fs */
>	bytes = statfsbuf.f_bsize * statfsbuf.f_bfree;
>
>	for (i = 0; i < ((bytes/1024) + 1); i++)
>		write(fd, buf, BUFSZ);
>
>	fsync(fd);
>
>	/* if we've overrun the amount of space, then we should now be
>	 * doing synchronous writes.
>	 */
>	written = write(fd, buf, BUFSZ);
>	if (written < 0)
>		printf("success: final write returned error!\n");
>	else {
>		printf("failure: final write did not return error!\n");
>		return 1;
>	}
>
>	/* shrink file to slightly less than the amount of space */
>	err = ftruncate(fd, bytes - (3 * BUFSZ));
>	if (err < 0) {
>		printf("truncate failed: %d\n", errno);
>		return 1;
>	}
>
>	/* this write should succeed */
>	write(fd, buf, BUFSZ);
>	fsync(fd);
>
>	for (i = 0; i < 4; i++) {
>		written = write(fd, buf, BUFSZ);
>		if (written < 0) {
>			printf("failure: write errored out -- should have succeeded!\n");
>			return 1;
>		}
>	}
>	printf("success: writes didn't error -- async writes reenabled!\n");
>	return 0;	
>}

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Attachments on bug 438423: 298747 | 299375 | 299887 | 302444