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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2021 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <djwong@kernel.org>
*
* Regression test for failing to undo delalloc quota reservations when
* changing project id and we fail some other FSSETXATTR validation.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <linux/fs.h>
#include "global.h"
static char zerobuf[65536];
int
main(
int argc,
char *argv[])
{
struct fsxattr fa;
ssize_t sz;
int fd, ret;
if (argc < 2) {
printf("Usage: %s filename\n", argv[0]);
return 1;
}
fd = open(argv[1], O_CREAT | O_TRUNC | O_RDWR, 0600);
if (fd < 0) {
perror(argv[1]);
return 2;
}
/* Zero the project id and the extent size hint. */
ret = ioctl(fd, FS_IOC_FSGETXATTR, &fa);
if (ret) {
perror("FSGETXATTR check file");
return 2;
}
if (fa.fsx_projid != 0 || fa.fsx_extsize != 0) {
fa.fsx_projid = 0;
fa.fsx_extsize = 0;
ret = ioctl(fd, FS_IOC_FSSETXATTR, &fa);
if (ret) {
perror("FSSETXATTR zeroing");
return 2;
}
}
/* Dirty a few kb of a file to create delalloc extents. */
sz = write(fd, zerobuf, sizeof(zerobuf));
if (sz != sizeof(zerobuf)) {
perror("delalloc write");
return 2;
}
/*
* The regression we're trying to test happens when the fsxattr input
* validation decides to bail out after the chown quota reservation has
* been made on a file containing delalloc extents. Extent size hints
* can't be set on non-empty files and we can't check the value until
* we've reserved resources and taken the file's ILOCK, so this is a
* perfect vector for triggering this condition. In this way we set up
* a FSSETXATTR call that will fail.
*/
ret = ioctl(fd, FS_IOC_FSGETXATTR, &fa);
if (ret) {
perror("FSGETXATTR");
return 2;
}
fa.fsx_projid = 23652;
fa.fsx_extsize = 2;
fa.fsx_xflags |= FS_XFLAG_EXTSIZE;
ret = ioctl(fd, FS_IOC_FSSETXATTR, &fa);
if (ret) {
printf("FSSETXATTRR should fail: %s\n", strerror(errno));
return 0;
}
/* Uhoh, that FSSETXATTR call should have failed! */
return 3;
}
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