1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2019 SUSE LLC
4 * Author: Christian Amann <camann@suse.com>
5 *
6 * Tests the ioctl functionality to deduplicate fileranges using
7 * btrfs filesystem.
8 *
9 * 1) Sets the same contents for two files and deduplicates it.
10 * Deduplicates 3 bytes and set the status to
11 * FILE_DEDUPE_RANGE_SAME.
12 * 2) Sets different content for two files and tries to
13 * deduplicate it. 0 bytes get deduplicated and status is
14 * set to FILE_DEDUPE_RANGE_DIFFERS.
15 * 3) Sets same content for two files but sets the length to
16 * deduplicate to -1. ioctl(FIDEDUPERANGE) fails with EINVAL.
17 */
18
19 #include "config.h"
20 #include <stdlib.h>
21 #include <sys/ioctl.h>
22 #include <errno.h>
23 #include "tst_test.h"
24
25 #ifdef HAVE_STRUCT_FILE_DEDUPE_RANGE
26 #include <linux/fs.h>
27
28 #define SUCCESS 0
29
30 #define MNTPOINT "mnt_point"
31 #define FILE_SRC_PATH MNTPOINT"/file_src"
32 #define FILE_DEST_PATH MNTPOINT"/file_dest"
33
34 static int fd_src;
35 static int fd_dest;
36 static struct file_dedupe_range *fdr;
37
38 static struct tcase {
39 uint64_t src_length;
40 char *src_fcontents;
41 char *dest_fcontents;
42 int exp_err;
43 uint64_t bytes_deduped;
44 int status;
45 } tcases[] = {
46 {3, "AAA", "AAA", SUCCESS, 3, FILE_DEDUPE_RANGE_SAME},
47 {3, "AAA", "AAB", SUCCESS, 0, FILE_DEDUPE_RANGE_DIFFERS},
48 {-1, "AAA", "AAA", EINVAL, 0, 0},
49 };
50
verify_ioctl(unsigned int n)51 static void verify_ioctl(unsigned int n)
52 {
53 struct tcase *tc = &tcases[n];
54
55 fd_src = SAFE_OPEN(FILE_SRC_PATH, O_RDWR | O_CREAT, 0664);
56 fd_dest = SAFE_OPEN(FILE_DEST_PATH, O_RDWR | O_CREAT, 0664);
57
58 SAFE_WRITE(SAFE_WRITE_ALL, fd_src, tc->src_fcontents, strlen(tc->src_fcontents));
59 SAFE_WRITE(SAFE_WRITE_ALL, fd_dest, tc->dest_fcontents, strlen(tc->dest_fcontents));
60
61 memset(fdr, 0, sizeof(struct file_dedupe_range) +
62 sizeof(struct file_dedupe_range_info));
63
64 fdr->src_length = tc->src_length;
65 fdr->dest_count = 1;
66 fdr->info[0].dest_fd = fd_dest;
67
68 TEST(ioctl(fd_src, FIDEDUPERANGE, fdr));
69
70 if (tc->exp_err != TST_ERR) {
71 tst_res(TFAIL,
72 "ioctl(FIDEDUPERANGE) ended with %s, expected %s",
73 tst_strerrno(TST_ERR), tst_strerrno(tc->exp_err));
74 return;
75 }
76
77 if (fdr->info[0].bytes_deduped != tc->bytes_deduped) {
78 tst_res(TFAIL,
79 "ioctl(FIDEDUPERANGE) deduplicated %lld bytes, expected %ld. Status: %d",
80 fdr->info[0].bytes_deduped, tc->bytes_deduped,
81 fdr->info[0].status);
82 return;
83 }
84
85 if (fdr->info[0].status != tc->status) {
86 tst_res(TFAIL,
87 "ioctl(FIDEDUPERANGE) status set to %d, expected %d",
88 fdr->info[0].status, tc->status);
89 return;
90 }
91
92 tst_res(TPASS, "ioctl(FIDEDUPERANGE) ended with %s as expected",
93 tst_strerrno(tc->exp_err));
94
95 SAFE_CLOSE(fd_dest);
96 SAFE_CLOSE(fd_src);
97 }
98
cleanup(void)99 static void cleanup(void)
100 {
101 if (fd_dest > 0)
102 SAFE_CLOSE(fd_dest);
103 if (fd_src > 0)
104 SAFE_CLOSE(fd_src);
105 if (fdr)
106 free(fdr);
107 }
108
setup(void)109 static void setup(void)
110 {
111 fdr = SAFE_MALLOC(sizeof(struct file_dedupe_range) +
112 sizeof(struct file_dedupe_range_info));
113 }
114
115
116 static struct tst_test test = {
117 .test = verify_ioctl,
118 .tcnt = ARRAY_SIZE(tcases),
119 .setup = setup,
120 .cleanup = cleanup,
121 .min_kver = "4.5",
122 .needs_root = 1,
123 .mount_device = 1,
124 .mntpoint = MNTPOINT,
125 .dev_fs_type = "btrfs",
126 .needs_drivers = (const char *const[]) {
127 "btrfs",
128 NULL,
129 },
130 };
131 #else
132 TST_TEST_TCONF(
133 "This system does not provide support for ioctl(FIDEDUPERANGE)");
134 #endif
135