return atomic_dec_return(v);
}
-/* Open a file with the specific @param path, @param flag, @param mode
- * @param fpp the pointer of struct file pointer to get struct file pointer while file opening is success
- * @param path the path of the file to open
- * @param flag file operation flags, please refer to linux document
- * @param mode please refer to linux document
- * @return Linux specific error code
- */
-static int openfile(struct file **fpp, char *path, int flag, int mode)
-{
- struct file *fp;
-
- fp = filp_open(path, flag, mode);
- if (IS_ERR(fp)) {
- *fpp = NULL;
- return PTR_ERR(fp);
- } else {
- *fpp = fp;
- return 0;
- }
-}
-
-/* Close the file with the specific @param fp
- * @param fp the pointer of struct file to close
- * @return always 0
- */
-static int closefile(struct file *fp)
-{
- filp_close(fp, NULL);
- return 0;
-}
-
-static int readfile(struct file *fp, char __user *buf, int len)
-{
- int rlen = 0, sum = 0;
-
- if (!fp->f_op || !fp->f_op->read)
- return -EPERM;
-
- while (sum < len) {
- rlen = fp->f_op->read(fp, buf+sum, len-sum, &fp->f_pos);
- if (rlen > 0)
- sum += rlen;
- else if (0 != rlen)
- return rlen;
- else
- break;
- }
- return sum;
-}
-
-static int writefile(struct file *fp, char __user *buf, int len)
-{
- int wlen = 0, sum = 0;
-
- if (!fp->f_op || !fp->f_op->write)
- return -EPERM;
-
- while (sum < len) {
- wlen = fp->f_op->write(fp, buf+sum, len-sum, &fp->f_pos);
- if (wlen > 0)
- sum += wlen;
- else if (0 != wlen)
- return wlen;
- else
- break;
- }
- return sum;
-}
-
-/* Test if the specifi @param path is a file and readable
- * @param path the path of the file to test
- * @return Linux specific error code
- */
-static int isfilereadable(char *path)
-{
- struct file *fp;
- int ret = 0;
- mm_segment_t oldfs;
- char __user buf;
-
- fp = filp_open(path, O_RDONLY, 0);
- if (IS_ERR(fp)) {
- ret = PTR_ERR(fp);
- } else {
- oldfs = get_fs(); set_fs(get_ds());
-
- if (1 != readfile(fp, &buf, 1))
- ret = PTR_ERR(fp);
-
- set_fs(oldfs);
- filp_close(fp, NULL);
- }
- return ret;
-}
-
-/* Open the file with @param path and retrive the file content into
- * memory starting from @param buf for @param sz at most
- * @param path the path of the file to open and read
- * @param buf the starting address of the buffer to store file content
- * @param sz how many bytes to read at most
- * @return the byte we've read, or Linux specific error code
- */
-static int retrievefromfile(char *path, u8 __user *buf, u32 sz)
-{
- int ret = -1;
- mm_segment_t oldfs;
- struct file *fp;
-
- if (path && buf) {
- ret = openfile(&fp, path, O_RDONLY, 0);
- if (0 == ret) {
- DBG_88E("%s openfile path:%s fp =%p\n", __func__,
- path, fp);
-
- oldfs = get_fs(); set_fs(get_ds());
- ret = readfile(fp, buf, sz);
- set_fs(oldfs);
- closefile(fp);
-
- DBG_88E("%s readfile, ret:%d\n", __func__, ret);
-
- } else {
- DBG_88E("%s openfile path:%s Fail, ret:%d\n", __func__,
- path, ret);
- }
- } else {
- DBG_88E("%s NULL pointer\n", __func__);
- ret = -EINVAL;
- }
- return ret;
-}
-
-/*
-* Open the file with @param path and wirte @param sz byte of data starting from @param buf into the file
-* @param path the path of the file to open and write
-* @param buf the starting address of the data to write into file
-* @param sz how many bytes to write at most
-* @return the byte we've written, or Linux specific error code
-*/
-static int storetofile(char *path, u8 __user *buf, u32 sz)
-{
- int ret = 0;
- mm_segment_t oldfs;
- struct file *fp;
-
- if (path && buf) {
- ret = openfile(&fp, path, O_CREAT|O_WRONLY, 0666);
- if (0 == ret) {
- DBG_88E("%s openfile path:%s fp =%p\n", __func__, path, fp);
-
- oldfs = get_fs(); set_fs(get_ds());
- ret = writefile(fp, buf, sz);
- set_fs(oldfs);
- closefile(fp);
-
- DBG_88E("%s writefile, ret:%d\n", __func__, ret);
-
- } else {
- DBG_88E("%s openfile path:%s Fail, ret:%d\n", __func__, path, ret);
- }
- } else {
- DBG_88E("%s NULL pointer\n", __func__);
- ret = -EINVAL;
- }
- return ret;
-}
-
-/*
-* Test if the specifi @param path is a file and readable
-* @param path the path of the file to test
-* @return true or false
-*/
-int rtw_is_file_readable(char *path)
-{
- if (isfilereadable(path) == 0)
- return true;
- else
- return false;
-}
-
-/*
-* Open the file with @param path and retrive the file content into memory starting from @param buf for @param sz at most
-* @param path the path of the file to open and read
-* @param buf the starting address of the buffer to store file content
-* @param sz how many bytes to read at most
-* @return the byte we've read
-*/
-int rtw_retrive_from_file(char *path, u8 __user *buf, u32 sz)
-{
- int ret = retrievefromfile(path, buf, sz);
-
- return ret >= 0 ? ret : 0;
-}
-
-/*
- * Open the file with @param path and wirte @param sz byte of data
- * starting from @param buf into the file
- * @param path the path of the file to open and write
- * @param buf the starting address of the data to write into file
- * @param sz how many bytes to write at most
- * @return the byte we've written
- */
-int rtw_store_to_file(char *path, u8 __user *buf, u32 sz)
-{
- int ret = storetofile(path, buf, sz);
- return ret >= 0 ? ret : 0;
-}
-
struct net_device *rtw_alloc_etherdev_with_old_priv(int sizeof_priv,
void *old_priv)
{
git.samba.org / sfrench / cifs-2.6.git / blobdiff