/**
* Synchronize memory mapping with the file.
* Called from process context.
*/
static void
tempesta_unmap_file(struct file *file, unsigned long addr, unsigned long len,
int node)
{
mm_segment_t oldfs;
MArea *ma;
loff_t off = 0;
ssize_t r;
mutex_lock(&map_mtx);
ma = ma_lookup(addr, node);
if (!ma) {
TDB_WARN("Cannot sync memory area for %#lx address at node"
" %d\n", addr, node);
goto err;
}
oldfs = get_fs();
set_fs(get_ds());
r = kernel_write(file, (void *)ma->start, len, &off);
if (r != len) {
TDB_WARN("Cannot sync mapping %lx of size %lu pages\n",
ma->start, ma->pages);
goto err_fs;
}
err_fs:
set_fs(oldfs);
err:
fput(file);
ma_free(addr, node);
mutex_unlock(&map_mtx);
}
void *
tdb_htrie_open(void *addr, const char *fname, size_t size, int *fd)
{
void *p;
struct stat sb = { 0 };
if (!stat(fname, &sb)) {
printf("filesize: %ld\n", sb.st_size);
} else {
TDB_WARN("no files, create them\n");
}
if ((*fd = open(fname, O_RDWR|O_CREAT, O_RDWR)) < 0) {
perror("ERROR: open failure");
exit(1);
}
if (sb.st_size != size)
if (fallocate(*fd, 0, 0, size)) {
perror("ERROR: fallocate failure");
exit(1);
}
/* Use MAP_SHARED to carry changes to underlying file. */
p = mmap(addr, size, PROT_READ | PROT_WRITE, MAP_SHARED, *fd, 0);
if (p != addr) {
perror("ERROR: cannot mmap the file");
exit(1);
}
printf("maped to %p\n", p);
if (mlock(p, size)) {
perror("ERROR: mlock failure");
exit(1);
}
return p;
}