initial trim support
This commit is contained in:
comatose
parent
a1219f920f
commit
01919ef8a1
234
buse.c
234
buse.c
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@ -18,149 +18,157 @@
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*/
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#ifdef WORDS_BIGENDIAN
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u_int64_t ntohll(u_int64_t a) {
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return a;
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return a;
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}
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#else
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u_int64_t ntohll(u_int64_t a) {
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u_int32_t lo = a & 0xffffffff;
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u_int32_t hi = a >> 32U;
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lo = ntohl(lo);
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hi = ntohl(hi);
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return ((u_int64_t) lo) << 32U | hi;
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u_int32_t lo = a & 0xffffffff;
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u_int32_t hi = a >> 32U;
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lo = ntohl(lo);
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hi = ntohl(hi);
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return ((u_int64_t) lo) << 32U | hi;
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}
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#endif
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#define htonll ntohll
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static int read_all(int fd, void *buf, size_t count)
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{
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int bytes_read;
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int bytes_read;
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while (count > 0) {
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bytes_read = read(fd, buf, count);
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assert(bytes_read > 0);
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buf = (char *)buf + bytes_read;
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count -= bytes_read;
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}
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assert(count == 0);
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while (count > 0) {
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bytes_read = read(fd, buf, count);
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assert(bytes_read > 0);
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buf = (char *)buf + bytes_read;
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count -= bytes_read;
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}
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assert(count == 0);
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return 0;
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return 0;
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}
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static int write_all(int fd, const void *buf, size_t count)
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{
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int bytes_written;
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int bytes_written;
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while (count > 0) {
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bytes_written = write(fd, buf, count);
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assert(bytes_written > 0);
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buf = (char *)buf + bytes_written;
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count -= bytes_written;
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}
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assert(count == 0);
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while (count > 0) {
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bytes_written = write(fd, buf, count);
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assert(bytes_written > 0);
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buf = (char *)buf + bytes_written;
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count -= bytes_written;
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}
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assert(count == 0);
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return 0;
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return 0;
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}
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int buse_main(int argc, char *argv[], const struct buse_operations *aop, void *userdata)
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{
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int sp[2];
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int nbd, sk, err, tmp_fd;
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u_int64_t from;
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u_int32_t len, bytes_read;
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char *dev_file;
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struct nbd_request request;
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struct nbd_reply reply;
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void *chunk;
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int sp[2];
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int nbd, sk, err, tmp_fd;
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u_int64_t from;
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u_int32_t len;
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ssize_t bytes_read;
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char *dev_file;
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struct nbd_request request;
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struct nbd_reply reply;
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void *chunk;
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(void) userdata;
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(void) userdata;
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assert(argc == 3);
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dev_file = argv[2];
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assert(argc == 3);
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dev_file = argv[2];
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assert(!socketpair(AF_UNIX, SOCK_STREAM, 0, sp));
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assert(!socketpair(AF_UNIX, SOCK_STREAM, 0, sp));
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nbd = open(dev_file, O_RDWR);
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assert(nbd != -1);
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nbd = open(dev_file, O_RDWR);
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assert(nbd != -1);
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assert(ioctl(nbd, NBD_SET_SIZE, aop->size) != -1);
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assert(ioctl(nbd, NBD_SET_SIZE, aop->size) != -1);
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assert(ioctl(nbd, NBD_CLEAR_SOCK) != -1);
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if (!fork()) {
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/* The child needs to continue setting things up. */
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close(sp[0]);
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sk = sp[1];
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if(ioctl(nbd, NBD_SET_SOCK, sk) == -1){
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fprintf(stderr, "ioctl(nbd, NBD_SET_SOCK, sk) failed.[%s]\n", strerror(errno));
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}
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else if(ioctl(nbd, NBD_SET_FLAGS, NBD_FLAG_SEND_TRIM) == -1){
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fprintf(stderr, "ioctl(nbd, NBD_SET_FLAGS, NBD_FLAG_SEND_TRIM) failed.[%s]\n", strerror(errno));
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}
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else{
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err = ioctl(nbd, NBD_DO_IT);
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fprintf(stderr, "nbd device terminated with code %d\n", err);
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if (err == -1)
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fprintf(stderr, "%s\n", strerror(errno));
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}
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assert(ioctl(nbd, NBD_CLEAR_QUE) != -1);
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assert(ioctl(nbd, NBD_CLEAR_SOCK) != -1);
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if (!fork()) {
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/* The child needs to continue setting things up. */
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close(sp[0]);
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sk = sp[1];
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exit(0);
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}
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assert(ioctl(nbd, NBD_SET_SOCK, sk) != -1);
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err = ioctl(nbd, NBD_DO_IT);
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fprintf(stderr, "nbd device terminated with code %d\n", err);
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if (err == -1)
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fprintf(stderr, "%s\n", strerror(errno));
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/* The parent opens the device file at least once, to make sure the
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* partition table is updated. Then it closes it and starts serving up
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* requests. */
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assert(ioctl(nbd, NBD_CLEAR_QUE) != -1);
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assert(ioctl(nbd, NBD_CLEAR_SOCK) != -1);
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tmp_fd = open(dev_file, O_RDONLY);
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assert(tmp_fd != -1);
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close(tmp_fd);
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exit(0);
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close(sp[1]);
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sk = sp[0];
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reply.magic = htonl(NBD_REPLY_MAGIC);
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reply.error = htonl(0);
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while ((bytes_read = read(sk, &request, sizeof(request))) > 0) {
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assert(bytes_read == sizeof(request));
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memcpy(reply.handle, request.handle, sizeof(reply.handle));
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len = ntohl(request.len);
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from = ntohll(request.from);
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assert(request.magic == htonl(NBD_REQUEST_MAGIC));
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switch(ntohl(request.type)) {
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/* I may at some point need to deal with the the fact that the
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* official nbd server has a maximum buffer size, and divides up
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* oversized requests into multiple pieces. This applies to reads
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* and writes.
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*/
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case NBD_CMD_READ:
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/* fprintf(stderr, "Request for read of size %d\n", len); */
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chunk = malloc(len + sizeof(struct nbd_reply));
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aop->read((char *)chunk + sizeof(struct nbd_reply), len, from);
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memcpy(chunk, &reply, sizeof(struct nbd_reply));
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write_all(sk, chunk, len + sizeof(struct nbd_reply));
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free(chunk);
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break;
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case NBD_CMD_WRITE:
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/* fprintf(stderr, "Request for write of size %d\n", len); */
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chunk = malloc(len);
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read_all(sk, chunk, len);
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aop->write(chunk, len, from);
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free(chunk);
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write_all(sk, &reply, sizeof(struct nbd_reply));
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break;
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case NBD_CMD_DISC:
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/* Handle a disconnect request. */
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aop->disc();
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return 0;
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case NBD_CMD_FLUSH:
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aop->flush();
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break;
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case NBD_CMD_TRIM:
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aop->trim(from, len);
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break;
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default:
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assert(0);
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}
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/* The parent opens the device file at least once, to make sure the
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* partition table is updated. Then it closes it and starts serving up
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* requests. */
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tmp_fd = open(dev_file, O_RDONLY);
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assert(tmp_fd != -1);
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close(tmp_fd);
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close(sp[1]);
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sk = sp[0];
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reply.magic = htonl(NBD_REPLY_MAGIC);
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reply.error = htonl(0);
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while (1) {
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bytes_read = read(sk, &request, sizeof(request));
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assert(bytes_read == sizeof(request));
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memcpy(reply.handle, request.handle, sizeof(reply.handle));
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len = ntohl(request.len);
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from = ntohll(request.from);
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assert(request.magic == htonl(NBD_REQUEST_MAGIC));
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switch(ntohl(request.type)) {
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/* I may at some point need to deal with the the fact that the
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* official nbd server has a maximum buffer size, and divides up
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* oversized requests into multiple pieces. This applies to reads
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* and writes.
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*/
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case NBD_CMD_READ:
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/* fprintf(stderr, "Request for read of size %d\n", len); */
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chunk = malloc(len + sizeof(struct nbd_reply));
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aop->read((char *)chunk + sizeof(struct nbd_reply), len, from);
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memcpy(chunk, &reply, sizeof(struct nbd_reply));
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write_all(sk, chunk, len + sizeof(struct nbd_reply));
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free(chunk);
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break;
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case NBD_CMD_WRITE:
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/* fprintf(stderr, "Request for write of size %d\n", len); */
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chunk = malloc(len);
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read_all(sk, chunk, len);
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aop->write(chunk, len, from);
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free(chunk);
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write_all(sk, &reply, sizeof(struct nbd_reply));
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break;
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case NBD_CMD_DISC:
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/* Handle a disconnect request. */
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aop->disc();
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return 0;
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case NBD_CMD_FLUSH:
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aop->flush();
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break;
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case NBD_CMD_TRIM:
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aop->trim(from, len);
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break;
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default:
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assert(0);
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}
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}
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return 0;
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}
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if (bytes_read == -1)
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fprintf(stderr, "%s\n", strerror(errno));
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return 0;
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}
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6
buse.h
6
buse.h
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@ -26,6 +26,12 @@ enum {
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NBD_CMD_TRIM = 4
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};
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/* values for flags field */
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#define NBD_FLAG_HAS_FLAGS (1 << 0)
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#define NBD_FLAG_READ_ONLY (1 << 1)
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/* there is a gap here to match userspace */
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#define NBD_FLAG_SEND_TRIM (1 << 5) /* send trim/discard */
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/* Magic numbers */
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#define NBD_REQUEST_MAGIC 0x25609513
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#define NBD_REPLY_MAGIC 0x67446698
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40
busexmp.c
40
busexmp.c
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@ -8,32 +8,48 @@ static void *data;
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static int xmp_read(void *buf, u_int32_t len, u_int64_t offset)
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{
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memcpy(buf, (char *)data + offset, len);
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return 0;
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memcpy(buf, (char *)data + offset, len);
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fprintf(stderr, "R %lu %u\n", offset, len);
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return 0;
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}
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static int xmp_write(const void *buf, u_int32_t len, u_int64_t offset)
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{
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memcpy((char *)data + offset, buf, len);
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return 0;
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memcpy((char *)data + offset, buf, len);
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fprintf(stderr, "W %lu %u\n", offset, len);
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return 0;
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}
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static int xmp_disc()
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{
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fprintf(stderr, "Received a disconnect request.\n");
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return 0;
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fprintf(stderr, "Received a disconnect request.\n");
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return 0;
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}
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static int xmp_flush()
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{
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fprintf(stderr, "Received a flush request.\n");
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return 0;
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}
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static int xmp_trim(u_int64_t from, u_int32_t len)
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{
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fprintf(stderr, "T %lu %u\n", from, len);
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return 0;
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}
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static struct buse_operations aop = {
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.read = xmp_read,
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.write = xmp_write,
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.disc = xmp_disc,
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.size = 128 * 1024 * 1024,
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.read = xmp_read,
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.write = xmp_write,
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.disc = xmp_disc,
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.flush = xmp_flush,
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.trim = xmp_trim,
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.size = 128 * 1024 * 1024,
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};
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int main(int argc, char *argv[])
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{
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data = malloc(aop.size);
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data = malloc(aop.size);
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return buse_main(argc, argv, &aop, NULL);
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return buse_main(argc, argv, &aop, NULL);
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}
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