Added some error handling.
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parent
44b2f13ad4
commit
408c99ba0b
32
buse.c
32
buse.c
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@ -31,14 +31,14 @@ u_int64_t ntohll(u_int64_t a) {
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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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static int read_all(int fd, char* buf, size_t count)
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{
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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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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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@ -46,14 +46,14 @@ static int read_all(int fd, void *buf, size_t count)
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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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static int write_all(int fd, char* buf, size_t count)
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{
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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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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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@ -71,7 +71,7 @@ int buse_main(int argc, char *argv[], const struct buse_operations *aop, void *u
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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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char *chunk;
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(void) userdata;
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@ -104,8 +104,8 @@ int buse_main(int argc, char *argv[], const struct buse_operations *aop, void *u
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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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ioctl(nbd, NBD_CLEAR_QUE);
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ioctl(nbd, NBD_CLEAR_SOCK);
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exit(0);
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}
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@ -141,29 +141,31 @@ int buse_main(int argc, char *argv[], const struct buse_operations *aop, void *u
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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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reply.error = aop->read((char *)chunk + sizeof(struct nbd_reply), len, from);
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write_all(sk, (char*)&reply, sizeof(struct nbd_reply));
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if(reply.error == 0)
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write_all(sk, (char*)chunk, len);
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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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reply.error = 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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write_all(sk, (char*)&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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reply.error = aop->flush();
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write_all(sk, (char*)&reply, sizeof(struct nbd_reply));
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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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write_all(sk, &reply, sizeof(struct nbd_reply));
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reply.error = aop->trim(from, len);
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write_all(sk, (char*)&reply, sizeof(struct nbd_reply));
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break;
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default:
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assert(0);
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2
buse.h
2
buse.h
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@ -61,7 +61,7 @@ struct nbd_reply {
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struct buse_operations {
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int (*read)(void *buf, u_int32_t len, u_int64_t offset);
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int (*write)(const void *buf, u_int32_t len, u_int64_t offset);
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int (*disc)();
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void (*disc)();
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int (*flush)();
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int (*trim)(u_int64_t from, u_int32_t len);
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