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 "sched.h"
41 #include "sys/types.h"
42 #include "unistd.h"
43 #include "vfs_config.h"
44
45 /****************************************************************************
46 * Name: file_fallocate
47 ****************************************************************************/
48
file_fallocate64(struct file * filep,int mode,off64_t offset,off64_t len)49 ssize_t file_fallocate64(struct file *filep, int mode, off64_t offset, off64_t len)
50 {
51 int ret;
52 int err;
53
54 if (len <= 0) {
55 err = EINVAL;
56 goto errout;
57 }
58
59 /* Was this file opened for write access? */
60
61 if (((unsigned int)(filep->f_oflags) & O_ACCMODE) == O_RDONLY) {
62 err = EACCES;
63 goto errout;
64 }
65
66 /* Is a driver registered? Does it support the fallocate method? */
67 if (!filep->ops || !filep->ops->fallocate64) {
68 err = EBADF;
69 goto errout;
70 }
71
72 /* Yes, then let the driver perform the fallocate */
73
74 ret = filep->ops->fallocate64(filep, mode, offset, len);
75 if (ret < 0) {
76 err = -ret;
77 goto errout;
78 }
79
80 return ret;
81
82 errout:
83 set_errno(err);
84 return VFS_ERROR;
85 }
86
87 /***************************************************************************
88 * Name: fallocate
89 *
90 * Description:
91 * The fallocate() function prepares or allocates a contiguous data area to the file.
92 * Thus the write file is guaranteed be contiguous and no allocation delay until the
93 * size reaches that size at least unless any other changes to the volume is performed.
94 *
95 * Parameters:
96 * fp Pointer to the open file object.
97 * mode Operation mode. only support FALLOC_FL_KEEP_SIZE.
98 * offset offset of the file to allocated.
99 * len The size to allocate for the file.
100 *
101 * Returned Value:
102 * On success, allocate contiguous data area to the file . On error, -1 is returned, and errno is set appro-
103 * priately:
104 *
105 *
106 ********************************************************************************************/
107
fallocate64(int fd,int mode,off64_t offset,off64_t len)108 int fallocate64(int fd, int mode, off64_t offset, off64_t len)
109 {
110 #if CONFIG_NFILE_DESCRIPTORS > 0
111 struct file *filep = NULL;
112 #endif
113
114 /* Did we get a valid file descriptor? */
115
116 #if CONFIG_NFILE_DESCRIPTORS > 0
117 if ((unsigned int)fd >= CONFIG_NFILE_DESCRIPTORS)
118 #endif
119 {
120 set_errno(EBADF);
121 return VFS_ERROR;
122 }
123
124 #if CONFIG_NFILE_DESCRIPTORS > 0
125
126 /* The descriptor is in the right range to be a file descriptor... write
127 * to the file.
128 */
129
130 int ret = fs_getfilep(fd, &filep);
131 if (ret < 0) {
132 /* The errno value has already been set */
133 return VFS_ERROR;
134 }
135
136 if ((unsigned int)filep->f_oflags & O_DIRECTORY) {
137 set_errno(EBADF);
138 return VFS_ERROR;
139 }
140
141 /* Perform the fallocate operation using the file descriptor as an index */
142 return file_fallocate64(filep, mode, offset, len);
143 #endif
144 }
145