void
umain(void)
{
int r;
int fileid;
struct Fd *fd;
if ((r = fsipc_open("/not-found", O_RDONLY, FVA)) < 0 && r != -E_NOT_FOUND)
panic("serve_open /not-found: %e", r);
else if (r == 0)
panic("serve_open /not-found succeeded!");
if ((r = fsipc_open("/newmotd", O_RDONLY, FVA)) < 0)
panic("serve_open /newmotd: %e", r);
fd = (struct Fd*) FVA;
if (strlen(msg) != fd->fd_file.file.f_size)
panic("serve_open returned size %d wanted %d\n", fd->fd_file.file.f_size, strlen(msg));
cprintf("serve_open is good\n");
if ((r = fsipc_map(fd->fd_file.id, 0, UTEMP)) < 0)
panic("serve_map: %e", r);
if (strecmp(UTEMP, msg) != 0)
panic("serve_map returned wrong data");
cprintf("serve_map is good\n");
if ((r = fsipc_close(fd->fd_file.id)) < 0)
panic("serve_close: %e", r);
cprintf("serve_close is good\n");
fileid = fd->fd_file.id;
sys_page_unmap(0, (void*) FVA);
if ((r = fsipc_map(fileid, 0, UTEMP)) != -E_INVAL)
panic("serve_map does not handle stale fileids correctly");
cprintf("stale fileid is good\n");
}
// Call the file system server to obtain and map file pages
// when the size of the file as mapped in our memory increases.
// Harmlessly does nothing if oldsize >= newsize.
// Returns 0 on success, < 0 on error.
// If there is an error, unmaps any newly allocated pages.
static int
fmap(struct Fd* fd, off_t oldsize, off_t newsize)
{
size_t i;
char *va;
int r;
va = fd2data(fd);
for (i = ROUNDUP(oldsize, PGSIZE); i < newsize; i += PGSIZE) {
if ((r = fsipc_map(fd->fd_file.id, i, va + i)) < 0) {
// unmap anything we may have mapped so far
funmap(fd, i, oldsize, 0);
return r;
}
}
return 0;
}
// Call the file system server to obtain and map file pages
// when the size of the file as mapped in our memory increases.
// Harmlessly does nothing if oldsize >= newsize.
// Returns 0 on success, < 0 on error.
// If there is an error, unmaps any newly allocated pages.
static int
fmap(struct Fd* fd, off_t oldsize, off_t newsize)
{
size_t i;
char *va;
int r;
// Hint: Use fsipc_map.
// Hint: Remember to unmap any pages you mapped if
// an error occurs.
// LAB 5: Your code here.
va = fd2data(fd);
for (i = ROUNDUP(oldsize, PGSIZE); i < newsize; i += PGSIZE) {
if ((r = fsipc_map(fd->fd_file.id, i, va + i)) < 0) {
funmap(fd, i, oldsize, 0);
return r;
}
}
return 0;
}
