1 | /* Basic fallocate test (no specific flags is checked). |
2 | Copyright (C) 2016-2022 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <errno.h> |
20 | #include <fcntl.h> |
21 | #include <limits.h> |
22 | #include <stdint.h> |
23 | #include <string.h> |
24 | #include <sys/stat.h> |
25 | #include <sys/types.h> |
26 | #include <unistd.h> |
27 | |
28 | #include <support/support.h> |
29 | #include <support/check.h> |
30 | #include <support/temp_file.h> |
31 | |
32 | #define XSTR(s) STR(S) |
33 | #define STR(s) #s |
34 | |
35 | static char *temp_filename; |
36 | static int temp_fd; |
37 | |
38 | static void |
39 | do_prepare (int argc, char **argv) |
40 | { |
41 | temp_fd = create_temp_file (base: "tst-fallocate." , filename: &temp_filename); |
42 | if (temp_fd == -1) |
43 | FAIL_EXIT1 ("cannot create temporary file: %m" ); |
44 | if (!support_descriptor_supports_holes (fd: temp_fd)) |
45 | FAIL_UNSUPPORTED ("File %s does not support holes" , temp_filename); |
46 | } |
47 | #define PREPARE do_prepare |
48 | |
49 | static int |
50 | do_test_with_offset (off_t offset) |
51 | { |
52 | int ret; |
53 | struct stat finfo; |
54 | #define BLK_SIZE 1024 |
55 | char bwrite[BLK_SIZE] = { 0xf0 }; |
56 | char bread[BLK_SIZE]; |
57 | |
58 | /* It tries to fallocate 1024 bytes from 'offset' and then write 1024 bytes. |
59 | After both operation rewind the file descriptor and read 1024 bytes |
60 | and check if both buffer have the same contents. */ |
61 | ret = fallocate (fd: temp_fd, mode: 0, offset: offset, BLK_SIZE); |
62 | if (ret == -1) |
63 | { |
64 | /* fallocate might not be fully supported by underlying filesystem (for |
65 | instance some NFS versions). */ |
66 | if (errno == EOPNOTSUPP) |
67 | FAIL_EXIT (77, "fallocate not supported" ); |
68 | FAIL_EXIT1 ("fallocate failed" ); |
69 | } |
70 | |
71 | ret = fstat (fd: temp_fd, buf: &finfo); |
72 | if (ret == -1) |
73 | FAIL_EXIT1 ("fstat failed" ); |
74 | |
75 | if (finfo.st_size < (offset + BLK_SIZE)) |
76 | FAIL_EXIT1 ("size of first fallocate less than expected (%llu)" , |
77 | (long long unsigned int)offset + BLK_SIZE); |
78 | |
79 | if (lseek (fd: temp_fd, offset: offset, SEEK_SET) == (off_t) -1) |
80 | FAIL_EXIT1 ("fseek (0, SEEK_SET) failed" ); |
81 | |
82 | if (write (temp_fd, bwrite, BLK_SIZE) != BLK_SIZE) |
83 | FAIL_EXIT1 ("fail trying to write " XSTR (BLK_SIZE) " bytes" ); |
84 | |
85 | if (lseek (fd: temp_fd, offset: offset, SEEK_SET) == (off_t) -1) |
86 | FAIL_EXIT1 ("fseek (0, SEEK_SET) failed" ); |
87 | |
88 | if (read (temp_fd, bread, BLK_SIZE) != BLK_SIZE) |
89 | FAIL_EXIT1 ("fail trying to read " XSTR (BLK_SIZE) " bytes" ); |
90 | |
91 | if (memcmp (bwrite, bread, BLK_SIZE) != 0) |
92 | FAIL_EXIT1 ("buffer written different than buffer readed" ); |
93 | |
94 | return 0; |
95 | } |
96 | |
97 | /* This function is defined by the individual tests. */ |
98 | static int do_test (void); |
99 | |
100 | #include <support/test-driver.c> |
101 | |