Revision b90fb4b8 nbd.c
| b/nbd.c | ||
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#include <ctype.h> |
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#include <inttypes.h> |
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#ifdef __linux__ |
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#include <linux/fs.h> |
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#endif |
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#include "qemu_socket.h" |
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//#define DEBUG_NBD |
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Request (type == 2) |
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*/ |
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int nbd_negotiate(int csock, off_t size) |
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int nbd_negotiate(int csock, off_t size, uint32_t flags)
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{
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char buf[8 + 8 + 8 + 128]; |
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|
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[ 0 .. 7] passwd ("NBDMAGIC")
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[ 8 .. 15] magic (0x00420281861253) |
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[16 .. 23] size |
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[24 .. 151] reserved (0) |
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[24 .. 27] flags |
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[28 .. 151] reserved (0) |
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*/ |
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TRACE("Beginning negotiation.");
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memcpy(buf, "NBDMAGIC", 8); |
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cpu_to_be64w((uint64_t*)(buf + 8), 0x00420281861253LL); |
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cpu_to_be64w((uint64_t*)(buf + 16), size); |
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memset(buf + 24, 0, 128); |
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cpu_to_be32w((uint32_t*)(buf + 24), flags | NBD_FLAG_HAS_FLAGS); |
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memset(buf + 28, 0, 124); |
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if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) {
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LOG("write failed");
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return 0; |
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} |
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#ifndef _WIN32
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int nbd_init(int fd, int csock, off_t size, size_t blocksize) |
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#ifdef __linux__
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int nbd_init(int fd, int csock, uint32_t flags, off_t size, size_t blocksize)
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{
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TRACE("Setting block size to %lu", (unsigned long)blocksize);
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|
| ... | ... | |
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return -1; |
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} |
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if (flags & NBD_FLAG_READ_ONLY) {
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int read_only = 1; |
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TRACE("Setting readonly attribute");
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if (ioctl(fd, BLKROSET, (unsigned long) &read_only) < 0) {
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int serrno = errno; |
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LOG("Failed setting read-only attribute");
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errno = serrno; |
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return -1; |
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} |
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} |
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TRACE("Clearing NBD socket");
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if (ioctl(fd, NBD_CLEAR_SOCK) == -1) {
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| ... | ... | |
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} |
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int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset, |
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off_t *offset, bool readonly, uint8_t *data, int data_size)
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off_t *offset, uint32_t nbdflags, uint8_t *data, int data_size)
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{
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struct nbd_request request; |
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struct nbd_reply reply; |
| ... | ... | |
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return -1; |
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} |
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if (readonly) {
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if (nbdflags & NBD_FLAG_READ_ONLY) {
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TRACE("Server is read-only, return error");
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reply.error = 1; |
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} else {
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