1 /*
2 * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
3 * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this list of
9 * conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
12 * of conditions and the following disclaimer in the documentation and/or other materials
13 * provided with the distribution.
14 *
15 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
16 * to endorse or promote products derived from this software without specific prior written
17 * permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /****************************************************************************
33 * Included Files
34 ****************************************************************************/
35
36 #include "assert.h"
37 #include "errno.h"
38 #include "fcntl.h"
39 #include "fs/file.h"
40 #include "sys/types.h"
41 #include "sched.h"
42 #include "unistd.h"
43 #include "vfs_config.h"
44
45 /****************************************************************************
46 * Name: file_fallocate
47 ****************************************************************************/
48
file_fallocate(struct file *filep, int mode, off_t offset, off_t len)49 static ssize_t file_fallocate(struct file *filep, int mode, off_t offset, off_t len)
50 {
51 int ret;
52
53 if (len <= 0) {
54 ret = EINVAL;
55 goto errout;
56 }
57
58 /* Was this file opened for write access? */
59
60 if (((unsigned int)(filep->f_oflags) & O_ACCMODE) == O_RDONLY) {
61 ret = -EACCES;
62 goto errout;
63 }
64
65 if (!filep->ops || !filep->ops->fallocate) {
66 ret = -EBADF;
67 goto errout;
68 }
69
70 /* Yes, then let the driver perform the fallocate */
71
72 ret = filep->ops->fallocate(filep, mode, offset, len);
73 if (ret < 0) {
74 goto errout;
75 }
76
77 return ret;
78
79 errout:
80 set_errno(-ret);
81 return VFS_ERROR;
82 }
83
84 /***************************************************************************
85 * Name: fallocate
86 *
87 * Description:
88 * The fallocate() function prepares or allocates a contiguous data area to the file.
89 * Thus the write file is guaranteed be contiguous and no allocation delay until the
90 * size reaches that size at least unless any other changes to the volume is performed.
91 *
92 * Parameters:
93 * fp Pointer to the open file object.
94 * mode Operation mode. only support FALLOC_FL_KEEP_SIZE.
95 * offset offset of the file to allocated.
96 * len The size to allocate for the file.
97 *
98 * Returned Value:
99 * On success, allocate contiguous data area to the file . On error, -1 is returned, and errno is set appro-
100 * priately:
101 *
102 *
103 ********************************************************************************************/
104
fallocate(int fd, int mode, off_t offset, off_t len)105 int fallocate(int fd, int mode, off_t offset, off_t len)
106 {
107 #if CONFIG_NFILE_DESCRIPTORS > 0
108 struct file *filep = NULL;
109 #endif
110
111 /* Did we get a valid file descriptor? */
112
113 #if CONFIG_NFILE_DESCRIPTORS > 0
114 if ((unsigned int)fd >= CONFIG_NFILE_DESCRIPTORS)
115 #endif
116 {
117 set_errno(EBADF);
118 return VFS_ERROR;
119 }
120
121 #if CONFIG_NFILE_DESCRIPTORS > 0
122
123 /* The descriptor is in the right range to be a file descriptor... write to the file. */
124
125 int ret = fs_getfilep(fd, &filep);
126 if (ret < 0) {
127 /* The errno value has already been set */
128 return VFS_ERROR;
129 }
130
131 if (filep->f_oflags & O_DIRECTORY) {
132 set_errno(EBADF);
133 return VFS_ERROR;
134 }
135
136 /* Perform the fallocate operation using the file descriptor as an index */
137 return file_fallocate(filep, mode, offset, len);
138 #endif
139 }
140