/* Read the buffer requested by copying as much as needed from each
page. Invalid pages will be replaced with NULLs.
*/
ssize_t pmem_read(struct file *file, char *buf, size_t count,
loff_t *poff) {
size_t to_read, remaining;
to_read = count;
remaining = to_read;
/* Just keep going until the full buffer is copied. Due to the null
padding on error its impossible to fail here.
*/
while(remaining > 0) {
remaining -= pmem_read_partial(file, buf + (to_read - remaining),
remaining, poff);
};
return to_read;
}
/* Read the buffer requested by copying as much as needed from each
page. Invalid pages will be replaced with NULLs.
*/
static ssize_t pmem_read(struct file *file, char *buf, size_t count,
loff_t *poff) {
loff_t file_size = pmem_get_size();
/* How much data is available in the entire memory range. */
size_t available = file_size - *poff;
size_t to_read = min(count, available);
size_t remaining = to_read;
if(file_size < *poff)
return 0;
/* Just keep going until the full buffer is copied. Due to the null
padding on error its impossible to fail here.
*/
while(remaining > 0) {
remaining -= pmem_read_partial(file, buf + (to_read - remaining),
remaining, poff);
};
return to_read;
}