1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2018 FUJITSU LIMITED. All rights reserved.
4 * Author: Xiao Yang <yangx.jy@cn.fujitsu.com>
5 */
6
7 /*
8 * Description:
9 * Check the basic functionality of the preadv(2) for the file
10 * opened with O_DIRECT in all filesystem.
11 * preadv(2) should succeed to read the expected content of data
12 * and after reading the file, the file offset is not changed.
13 */
14
15 #define _GNU_SOURCE
16 #include <stdlib.h>
17 #include <string.h>
18 #include <sys/uio.h>
19 #include <sys/ioctl.h>
20 #include <sys/mount.h>
21 #include "tst_test.h"
22 #include "preadv.h"
23
24 #define MNTPOINT "mntpoint"
25 #define FNAME MNTPOINT"/file"
26
27 static int fd;
28 static off_t blk_off, zero_off;
29 static ssize_t blksz;
30 static char *pop_buf;
31
32 static struct iovec rd_iovec[] = {
33 {NULL, 0},
34 {NULL, 0},
35 };
36
37 static struct tcase {
38 int count;
39 off_t *offset;
40 ssize_t *size;
41 char content;
42 } tcases[] = {
43 {1, &zero_off, &blksz, 0x61},
44 {2, &zero_off, &blksz, 0x61},
45 {1, &blk_off, &blksz, 0x62},
46 };
47
verify_direct_preadv(unsigned int n)48 static void verify_direct_preadv(unsigned int n)
49 {
50 int i;
51 char *vec;
52 struct tcase *tc = &tcases[n];
53
54 vec = rd_iovec[0].iov_base;
55 memset(vec, 0x00, blksz);
56
57 SAFE_LSEEK(fd, 0, SEEK_SET);
58
59 TEST(preadv(fd, rd_iovec, tc->count, *tc->offset));
60 if (TST_RET < 0) {
61 tst_res(TFAIL | TTERRNO, "preadv(O_DIRECT) fails");
62 return;
63 }
64
65 if (TST_RET != *tc->size) {
66 tst_res(TFAIL, "preadv(O_DIRECT) read %li bytes, expected %zi",
67 TST_RET, *tc->size);
68 return;
69 }
70
71 for (i = 0; i < *tc->size; i++) {
72 if (vec[i] != tc->content)
73 break;
74 }
75
76 if (i < *tc->size) {
77 tst_res(TFAIL, "Buffer wrong at %i have %02x expected %02x",
78 i, vec[i], tc->content);
79 return;
80 }
81
82 if (SAFE_LSEEK(fd, 0, SEEK_CUR) != 0) {
83 tst_res(TFAIL, "preadv(O_DIRECT) has changed file offset");
84 return;
85 }
86
87 tst_res(TPASS, "preadv(O_DIRECT) read %zi bytes successfully "
88 "with content '%c' expectedly", *tc->size, tc->content);
89 }
90
setup(void)91 static void setup(void)
92 {
93 int dev_fd, ret;
94
95 dev_fd = SAFE_OPEN(tst_device->dev, O_RDWR);
96 SAFE_IOCTL(dev_fd, BLKSSZGET, &ret);
97 SAFE_CLOSE(dev_fd);
98
99 if (ret <= 0)
100 tst_brk(TBROK, "BLKSSZGET returned invalid block size %i", ret);
101
102 tst_res(TINFO, "Using block size %i", ret);
103
104 blksz = ret;
105 blk_off = ret;
106
107 fd = SAFE_OPEN(FNAME, O_RDWR | O_CREAT | O_DIRECT, 0644);
108
109 pop_buf = SAFE_MEMALIGN(blksz, blksz);
110 memset(pop_buf, 0x61, blksz);
111 SAFE_WRITE(1, fd, pop_buf, blksz);
112
113 memset(pop_buf, 0x62, blksz);
114 SAFE_WRITE(1, fd, pop_buf, blksz);
115
116 rd_iovec[0].iov_base = SAFE_MEMALIGN(blksz, blksz);
117 rd_iovec[0].iov_len = blksz;
118 }
119
cleanup(void)120 static void cleanup(void)
121 {
122 free(pop_buf);
123 free(rd_iovec[0].iov_base);
124
125 if (fd > 0)
126 SAFE_CLOSE(fd);
127 }
128
129 static struct tst_test test = {
130 .tcnt = ARRAY_SIZE(tcases),
131 .setup = setup,
132 .cleanup = cleanup,
133 .test = verify_direct_preadv,
134 .min_kver = "2.6.30",
135 .mntpoint = MNTPOINT,
136 .mount_device = 1,
137 .all_filesystems = 1,
138 .skip_filesystems = (const char *[]) {
139 "tmpfs",
140 NULL
141 }
142 };
143