extern "C" void open_file (const char *pathname, int flags, struct client client) {
uint32_t file_id;
struct decafs_file_stat stat;
int cursor;
// If the file does not exist
if ((decafs_file_sstat ((char *)pathname, &stat, client)) == FILE_NOT_FOUND) {
// If we are going to write to the file, create it
if (flags & O_RDWR) {
printf ("\tfile not found... creating now\n");
// Create the file
struct timeval time;
gettimeofday(&time, NULL);
// change 4th param to get_replica_size()
// implement in vmeta
file_id = add_file ((char *)pathname, get_stripe_size(), get_chunk_size(),
get_chunk_size(), time, client);
}
// We can't read from nothing!
else {
if (send_open_result (client, FILE_NOT_FOUND_FOR_READING) < 0) {
printf ("\tOpen result could not reach client.\n");
}
return;
}
}
else {
file_id = stat.file_id;
}
printf ("\tfile %s has id %d.\n", pathname, file_id);
// If we're opening with read only, obtain a read lock
if (flags & O_RDWR) {
// if we can't get a write lock, return that the file is in use so we can't
// open it
if (get_exclusive_lock (client, file_id) < 0) {
if (send_open_result (client, FILE_IN_USE) < 0) {
printf ("\tOpen result could not reach client.\n");
}
return;
}
printf ("\tobtained a write lock.\n");
}
// obtain a write lock
else {
// if we can't get a read lock, return that the file is in use so we can't
// open it
if (get_shared_lock (client, file_id) < 0) {
if (send_open_result (client, FILE_IN_USE) < 0) {
printf ("\tOpen result could not reach client.\n");
}
return;
}
printf ("\tobtained a read lock.\n");
}
cursor = new_file_cursor (file_id, client);
if (flags & O_APPEND) {
printf ("\tfile opened with O_APPEND, moving cursor to EOF.\n");
set_file_cursor (cursor, stat.size, client);
}
if (send_open_result (client, cursor) < 0) {
printf ("\tOpen result could not reach client.\n");
}
}
// open_file
extern "C" void open_file (const char *pathname, int flags, struct client client) {
send_open_result(client, 1);
}
