143 lines
4.5 KiB
C
143 lines
4.5 KiB
C
/*
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* Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
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* Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include "assert.h"
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#include "errno.h"
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#include "fcntl.h"
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#include "fs/file.h"
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#include "sys/types.h"
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#include "sched.h"
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#include "unistd.h"
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#include "vfs_config.h"
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/****************************************************************************
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* Name: file_fallocate
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****************************************************************************/
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static ssize_t file_fallocate(struct file *filep, int mode, off_t offset, off_t len)
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{
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int ret;
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if (len <= 0) {
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ret = EINVAL;
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goto errout;
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}
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/* Was this file opened for write access? */
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if (((unsigned int)(filep->f_oflags) & O_ACCMODE) == O_RDONLY) {
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ret = -EACCES;
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goto errout;
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}
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if (!filep->ops || !filep->ops->fallocate) {
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ret = -EBADF;
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goto errout;
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}
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/* Yes, then let the driver perform the fallocate */
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ret = filep->ops->fallocate(filep, mode, offset, len);
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if (ret < 0) {
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goto errout;
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}
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return ret;
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errout:
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set_errno(-ret);
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return VFS_ERROR;
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}
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/***************************************************************************
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* Name: fallocate
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*
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* Description:
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* The fallocate() function prepares or allocates a contiguous data area to the file.
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* Thus the write file is guaranteed be contiguous and no allocation delay until the
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* size reaches that size at least unless any other changes to the volume is performed.
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*
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* Parameters:
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* fp Pointer to the open file object.
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* mode Operation mode. only support FALLOC_FL_KEEP_SIZE.
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* offset offset of the file to allocated.
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* len The size to allocate for the file.
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*
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* Returned Value:
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* On success, allocate contiguous data area to the file . On error, -1 is returned, and errno is set appro-
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* priately:
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*
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*
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********************************************************************************************/
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int fallocate(int fd, int mode, off_t offset, off_t len)
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{
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#if CONFIG_NFILE_DESCRIPTORS > 0
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struct file *filep = NULL;
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#endif
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/* Did we get a valid file descriptor? */
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#if CONFIG_NFILE_DESCRIPTORS > 0
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if ((unsigned int)fd >= CONFIG_NFILE_DESCRIPTORS)
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#endif
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{
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set_errno(EBADF);
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return VFS_ERROR;
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}
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#if CONFIG_NFILE_DESCRIPTORS > 0
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/* The descriptor is in the right range to be a file descriptor... write to the file.*/
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int ret = fs_getfilep(fd, &filep);
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if (ret < 0)
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{
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/* The errno value has already been set */
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return VFS_ERROR;
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}
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if (filep->f_oflags & O_DIRECTORY)
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{
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set_errno(EBADF);
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return VFS_ERROR;
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}
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/* Perform the fallocate operation using the file descriptor as an index */
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return file_fallocate(filep, mode, offset, len);
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#endif
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}
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