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提交 b2e3d87f 编写于 作者: N Nick Thomas 提交者： Kevin Wolf
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NBD library: whitespace changes 

Signed-off-by: NNick Thomas <nick@bytemark.co.uk>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
上级 75717903
隐藏空白更改
内联 并排
Showing with 418 addition and 417 deletion
nbd.c
浏览文件 @ b2e3d87f
...@@ -49,7 +49,7 @@ ...@@ -49,7 +49,7 @@
/* This is all part of the "official" NBD API */ /* This is all part of the "official" NBD API */
#define NBD_REPLY_SIZE (4 + 4 + 8) #define NBD_REPLY_SIZE (4 + 4 + 8)
#define NBD_REQUEST_MAGIC 0x25609513 #define NBD_REQUEST_MAGIC 0x25609513
#define NBD_REPLY_MAGIC 0x67446698 #define NBD_REPLY_MAGIC 0x67446698
...@@ -59,11 +59,11 @@ ...@@ -59,11 +59,11 @@
#define NBD_DO_IT _IO(0xab, 3) #define NBD_DO_IT _IO(0xab, 3)
#define NBD_CLEAR_SOCK _IO(0xab, 4) #define NBD_CLEAR_SOCK _IO(0xab, 4)
#define NBD_CLEAR_QUE _IO(0xab, 5) #define NBD_CLEAR_QUE _IO(0xab, 5)
#define NBD_PRINT_DEBUG _IO(0xab, 6) #define NBD_PRINT_DEBUG _IO(0xab, 6)
#define NBD_SET_SIZE_BLOCKS _IO(0xab, 7) #define NBD_SET_SIZE_BLOCKS _IO(0xab, 7)
#define NBD_DISCONNECT _IO(0xab, 8) #define NBD_DISCONNECT _IO(0xab, 8)
#define NBD_OPT_EXPORT_NAME (1 << 0) #define NBD_OPT_EXPORT_NAME (1 << 0)
/* That's all folks */ /* That's all folks */
...@@ -273,241 +273,241 @@ int unix_socket_outgoing(const char *path) ...@@ -273,241 +273,241 @@ int unix_socket_outgoing(const char *path)
int nbd_negotiate(int csock, off_t size) int nbd_negotiate(int csock, off_t size)
{ {
char buf[8 + 8 + 8 + 128]; char buf[8 + 8 + 8 + 128];
/* Negotiate /* Negotiate
[ 0 .. 7] passwd ("NBDMAGIC") [ 0 .. 7] passwd ("NBDMAGIC")
[ 8 .. 15] magic (0x00420281861253) [ 8 .. 15] magic (0x00420281861253)
[16 .. 23] size [16 .. 23] size
[24 .. 151] reserved (0) [24 .. 151] reserved (0)
*/ */
TRACE("Beginning negotiation."); TRACE("Beginning negotiation.");
memcpy(buf, "NBDMAGIC", 8); memcpy(buf, "NBDMAGIC", 8);
cpu_to_be64w((uint64_t*)(buf + 8), 0x00420281861253LL); cpu_to_be64w((uint64_t*)(buf + 8), 0x00420281861253LL);
cpu_to_be64w((uint64_t*)(buf + 16), size); cpu_to_be64w((uint64_t*)(buf + 16), size);
memset(buf + 24, 0, 128); memset(buf + 24, 0, 128);
if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) {
LOG("write failed"); LOG("write failed");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
TRACE("Negotation succeeded."); TRACE("Negotation succeeded.");
return 0; return 0;
} }
int nbd_receive_negotiate(int csock, const char *name, uint32_t *flags, int nbd_receive_negotiate(int csock, const char *name, uint32_t *flags,
off_t *size, size_t *blocksize) off_t *size, size_t *blocksize)
{ {
char buf[256]; char buf[256];
uint64_t magic, s; uint64_t magic, s;
uint16_t tmp; uint16_t tmp;
TRACE("Receiving negotation."); TRACE("Receiving negotation.");
if (read_sync(csock, buf, 8) != 8) { if (read_sync(csock, buf, 8) != 8) {
LOG("read failed"); LOG("read failed");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
buf[8] = '\0'; buf[8] = '\0';
if (strlen(buf) == 0) { if (strlen(buf) == 0) {
LOG("server connection closed"); LOG("server connection closed");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
TRACE("Magic is %c%c%c%c%c%c%c%c", TRACE("Magic is %c%c%c%c%c%c%c%c",
qemu_isprint(buf[0]) ? buf[0] : '.', qemu_isprint(buf[0]) ? buf[0] : '.',
qemu_isprint(buf[1]) ? buf[1] : '.', qemu_isprint(buf[1]) ? buf[1] : '.',
qemu_isprint(buf[2]) ? buf[2] : '.', qemu_isprint(buf[2]) ? buf[2] : '.',
qemu_isprint(buf[3]) ? buf[3] : '.', qemu_isprint(buf[3]) ? buf[3] : '.',
qemu_isprint(buf[4]) ? buf[4] : '.', qemu_isprint(buf[4]) ? buf[4] : '.',
qemu_isprint(buf[5]) ? buf[5] : '.', qemu_isprint(buf[5]) ? buf[5] : '.',
qemu_isprint(buf[6]) ? buf[6] : '.', qemu_isprint(buf[6]) ? buf[6] : '.',
qemu_isprint(buf[7]) ? buf[7] : '.'); qemu_isprint(buf[7]) ? buf[7] : '.');
if (memcmp(buf, "NBDMAGIC", 8) != 0) { if (memcmp(buf, "NBDMAGIC", 8) != 0) {
LOG("Invalid magic received"); LOG("Invalid magic received");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
if (read_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) { if (read_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) {
LOG("read failed"); LOG("read failed");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
magic = be64_to_cpu(magic); magic = be64_to_cpu(magic);
TRACE("Magic is 0x%" PRIx64, magic); TRACE("Magic is 0x%" PRIx64, magic);
if (name) { if (name) {
uint32_t reserved = 0; uint32_t reserved = 0;
uint32_t opt; uint32_t opt;
uint32_t namesize; uint32_t namesize;
TRACE("Checking magic (opts_magic)"); TRACE("Checking magic (opts_magic)");
if (magic != 0x49484156454F5054LL) { if (magic != 0x49484156454F5054LL) {
LOG("Bad magic received"); LOG("Bad magic received");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) { if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) {
LOG("flags read failed"); LOG("flags read failed");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
*flags = be16_to_cpu(tmp) << 16; *flags = be16_to_cpu(tmp) << 16;
/* reserved for future use */ /* reserved for future use */
if (write_sync(csock, &reserved, sizeof(reserved)) != if (write_sync(csock, &reserved, sizeof(reserved)) !=
sizeof(reserved)) { sizeof(reserved)) {
LOG("write failed (reserved)"); LOG("write failed (reserved)");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
/* write the export name */ /* write the export name */
magic = cpu_to_be64(magic); magic = cpu_to_be64(magic);
if (write_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) { if (write_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) {
LOG("write failed (magic)"); LOG("write failed (magic)");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
opt = cpu_to_be32(NBD_OPT_EXPORT_NAME); opt = cpu_to_be32(NBD_OPT_EXPORT_NAME);
if (write_sync(csock, &opt, sizeof(opt)) != sizeof(opt)) { if (write_sync(csock, &opt, sizeof(opt)) != sizeof(opt)) {
LOG("write failed (opt)"); LOG("write failed (opt)");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
namesize = cpu_to_be32(strlen(name)); namesize = cpu_to_be32(strlen(name));
if (write_sync(csock, &namesize, sizeof(namesize)) != if (write_sync(csock, &namesize, sizeof(namesize)) !=
sizeof(namesize)) { sizeof(namesize)) {
LOG("write failed (namesize)"); LOG("write failed (namesize)");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
if (write_sync(csock, (char*)name, strlen(name)) != strlen(name)) { if (write_sync(csock, (char*)name, strlen(name)) != strlen(name)) {
LOG("write failed (name)"); LOG("write failed (name)");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
} else { } else {
TRACE("Checking magic (cli_magic)"); TRACE("Checking magic (cli_magic)");
if (magic != 0x00420281861253LL) { if (magic != 0x00420281861253LL) {
LOG("Bad magic received"); LOG("Bad magic received");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
} }
if (read_sync(csock, &s, sizeof(s)) != sizeof(s)) { if (read_sync(csock, &s, sizeof(s)) != sizeof(s)) {
LOG("read failed"); LOG("read failed");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
*size = be64_to_cpu(s); *size = be64_to_cpu(s);
*blocksize = 1024; *blocksize = 1024;
TRACE("Size is %" PRIu64, *size); TRACE("Size is %" PRIu64, *size);
if (!name) { if (!name) {
if (read_sync(csock, flags, sizeof(*flags)) != sizeof(*flags)) { if (read_sync(csock, flags, sizeof(*flags)) != sizeof(*flags)) {
LOG("read failed (flags)"); LOG("read failed (flags)");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
*flags = be32_to_cpup(flags); *flags = be32_to_cpup(flags);
} else { } else {
if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) { if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) {
LOG("read failed (tmp)"); LOG("read failed (tmp)");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
*flags |= be32_to_cpu(tmp); *flags |= be32_to_cpu(tmp);
} }
if (read_sync(csock, &buf, 124) != 124) { if (read_sync(csock, &buf, 124) != 124) {
LOG("read failed (buf)"); LOG("read failed (buf)");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
return 0; return 0;
} }
#ifndef _WIN32 #ifndef _WIN32
int nbd_init(int fd, int csock, off_t size, size_t blocksize) int nbd_init(int fd, int csock, off_t size, size_t blocksize)
{ {
TRACE("Setting block size to %lu", (unsigned long)blocksize); TRACE("Setting block size to %lu", (unsigned long)blocksize);
if (ioctl(fd, NBD_SET_BLKSIZE, blocksize) == -1) { if (ioctl(fd, NBD_SET_BLKSIZE, blocksize) == -1) {
int serrno = errno; int serrno = errno;
LOG("Failed setting NBD block size"); LOG("Failed setting NBD block size");
errno = serrno; errno = serrno;
return -1; return -1;
} }
TRACE("Setting size to %zd block(s)", (size_t)(size / blocksize)); TRACE("Setting size to %zd block(s)", (size_t)(size / blocksize));
if (ioctl(fd, NBD_SET_SIZE_BLOCKS, size / blocksize) == -1) { if (ioctl(fd, NBD_SET_SIZE_BLOCKS, size / blocksize) == -1) {
int serrno = errno; int serrno = errno;
LOG("Failed setting size (in blocks)"); LOG("Failed setting size (in blocks)");
errno = serrno; errno = serrno;
return -1; return -1;
} }
TRACE("Clearing NBD socket"); TRACE("Clearing NBD socket");
if (ioctl(fd, NBD_CLEAR_SOCK) == -1) { if (ioctl(fd, NBD_CLEAR_SOCK) == -1) {
int serrno = errno; int serrno = errno;
LOG("Failed clearing NBD socket"); LOG("Failed clearing NBD socket");
errno = serrno; errno = serrno;
return -1; return -1;
} }
TRACE("Setting NBD socket"); TRACE("Setting NBD socket");
if (ioctl(fd, NBD_SET_SOCK, csock) == -1) { if (ioctl(fd, NBD_SET_SOCK, csock) == -1) {
int serrno = errno; int serrno = errno;
LOG("Failed to set NBD socket"); LOG("Failed to set NBD socket");
errno = serrno; errno = serrno;
return -1; return -1;
} }
TRACE("Negotiation ended"); TRACE("Negotiation ended");
return 0; return 0;
} }
int nbd_disconnect(int fd) int nbd_disconnect(int fd)
{ {
ioctl(fd, NBD_CLEAR_QUE); ioctl(fd, NBD_CLEAR_QUE);
ioctl(fd, NBD_DISCONNECT); ioctl(fd, NBD_DISCONNECT);
ioctl(fd, NBD_CLEAR_SOCK); ioctl(fd, NBD_CLEAR_SOCK);
return 0; return 0;
} }
int nbd_client(int fd) int nbd_client(int fd)
{ {
int ret; int ret;
int serrno; int serrno;
TRACE("Doing NBD loop"); TRACE("Doing NBD loop");
ret = ioctl(fd, NBD_DO_IT); ret = ioctl(fd, NBD_DO_IT);
serrno = errno; serrno = errno;
TRACE("NBD loop returned %d: %s", ret, strerror(serrno)); TRACE("NBD loop returned %d: %s", ret, strerror(serrno));
TRACE("Clearing NBD queue"); TRACE("Clearing NBD queue");
ioctl(fd, NBD_CLEAR_QUE); ioctl(fd, NBD_CLEAR_QUE);
TRACE("Clearing NBD socket"); TRACE("Clearing NBD socket");
ioctl(fd, NBD_CLEAR_SOCK); ioctl(fd, NBD_CLEAR_SOCK);
errno = serrno; errno = serrno;
return ret; return ret;
} }
#else #else
int nbd_init(int fd, int csock, off_t size, size_t blocksize) int nbd_init(int fd, int csock, off_t size, size_t blocksize)
...@@ -531,235 +531,236 @@ int nbd_client(int fd) ...@@ -531,235 +531,236 @@ int nbd_client(int fd)
int nbd_send_request(int csock, struct nbd_request *request) int nbd_send_request(int csock, struct nbd_request *request)
{ {
uint8_t buf[4 + 4 + 8 + 8 + 4]; uint8_t buf[4 + 4 + 8 + 8 + 4];
cpu_to_be32w((uint32_t*)buf, NBD_REQUEST_MAGIC); cpu_to_be32w((uint32_t*)buf, NBD_REQUEST_MAGIC);
cpu_to_be32w((uint32_t*)(buf + 4), request->type); cpu_to_be32w((uint32_t*)(buf + 4), request->type);
cpu_to_be64w((uint64_t*)(buf + 8), request->handle); cpu_to_be64w((uint64_t*)(buf + 8), request->handle);
cpu_to_be64w((uint64_t*)(buf + 16), request->from); cpu_to_be64w((uint64_t*)(buf + 16), request->from);
cpu_to_be32w((uint32_t*)(buf + 24), request->len); cpu_to_be32w((uint32_t*)(buf + 24), request->len);
TRACE("Sending request to client");
if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) {
LOG("writing to socket failed");
errno = EINVAL;
return -1;
}
return 0;
}
TRACE("Sending request to client: "
"{ .from = %" PRIu64", .len = %u, .handle = %" PRIu64", .type=%i}",
request->from, request->len, request->handle, request->type);
if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) {
LOG("writing to socket failed");
errno = EINVAL;
return -1;
}
return 0;
}
static int nbd_receive_request(int csock, struct nbd_request *request) static int nbd_receive_request(int csock, struct nbd_request *request)
{ {
uint8_t buf[4 + 4 + 8 + 8 + 4]; uint8_t buf[4 + 4 + 8 + 8 + 4];
uint32_t magic; uint32_t magic;
if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) {
LOG("read failed"); LOG("read failed");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
/* Request /* Request
[ 0 .. 3] magic (NBD_REQUEST_MAGIC) [ 0 .. 3] magic (NBD_REQUEST_MAGIC)
[ 4 .. 7] type (0 == READ, 1 == WRITE) [ 4 .. 7] type (0 == READ, 1 == WRITE)
[ 8 .. 15] handle [ 8 .. 15] handle
[16 .. 23] from [16 .. 23] from
[24 .. 27] len [24 .. 27] len
*/ */
magic = be32_to_cpup((uint32_t*)buf); magic = be32_to_cpup((uint32_t*)buf);
request->type = be32_to_cpup((uint32_t*)(buf + 4)); request->type = be32_to_cpup((uint32_t*)(buf + 4));
request->handle = be64_to_cpup((uint64_t*)(buf + 8)); request->handle = be64_to_cpup((uint64_t*)(buf + 8));
request->from = be64_to_cpup((uint64_t*)(buf + 16)); request->from = be64_to_cpup((uint64_t*)(buf + 16));
request->len = be32_to_cpup((uint32_t*)(buf + 24)); request->len = be32_to_cpup((uint32_t*)(buf + 24));
TRACE("Got request: " TRACE("Got request: "
"{ magic = 0x%x, .type = %d, from = %" PRIu64" , len = %u }", "{ magic = 0x%x, .type = %d, from = %" PRIu64" , len = %u }",
magic, request->type, request->from, request->len); magic, request->type, request->from, request->len);
if (magic != NBD_REQUEST_MAGIC) { if (magic != NBD_REQUEST_MAGIC) {
LOG("invalid magic (got 0x%x)", magic); LOG("invalid magic (got 0x%x)", magic);
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
return 0; return 0;
} }
int nbd_receive_reply(int csock, struct nbd_reply *reply) int nbd_receive_reply(int csock, struct nbd_reply *reply)
{ {
uint8_t buf[NBD_REPLY_SIZE]; uint8_t buf[NBD_REPLY_SIZE];
uint32_t magic; uint32_t magic;
memset(buf, 0xAA, sizeof(buf)); memset(buf, 0xAA, sizeof(buf));
if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) {
LOG("read failed"); LOG("read failed");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
/* Reply /* Reply
[ 0 .. 3] magic (NBD_REPLY_MAGIC) [ 0 .. 3] magic (NBD_REPLY_MAGIC)
[ 4 .. 7] error (0 == no error) [ 4 .. 7] error (0 == no error)
[ 7 .. 15] handle [ 7 .. 15] handle
*/ */
magic = be32_to_cpup((uint32_t*)buf); magic = be32_to_cpup((uint32_t*)buf);
reply->error = be32_to_cpup((uint32_t*)(buf + 4)); reply->error = be32_to_cpup((uint32_t*)(buf + 4));
reply->handle = be64_to_cpup((uint64_t*)(buf + 8)); reply->handle = be64_to_cpup((uint64_t*)(buf + 8));
TRACE("Got reply: " TRACE("Got reply: "
"{ magic = 0x%x, .error = %d, handle = %" PRIu64" }", "{ magic = 0x%x, .error = %d, handle = %" PRIu64" }",
magic, reply->error, reply->handle); magic, reply->error, reply->handle);
if (magic != NBD_REPLY_MAGIC) { if (magic != NBD_REPLY_MAGIC) {
LOG("invalid magic (got 0x%x)", magic); LOG("invalid magic (got 0x%x)", magic);
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
return 0; return 0;
} }
static int nbd_send_reply(int csock, struct nbd_reply *reply) static int nbd_send_reply(int csock, struct nbd_reply *reply)
{ {
uint8_t buf[4 + 4 + 8]; uint8_t buf[4 + 4 + 8];
/* Reply /* Reply
[ 0 .. 3] magic (NBD_REPLY_MAGIC) [ 0 .. 3] magic (NBD_REPLY_MAGIC)
[ 4 .. 7] error (0 == no error) [ 4 .. 7] error (0 == no error)
[ 7 .. 15] handle [ 7 .. 15] handle
*/ */
cpu_to_be32w((uint32_t*)buf, NBD_REPLY_MAGIC); cpu_to_be32w((uint32_t*)buf, NBD_REPLY_MAGIC);
cpu_to_be32w((uint32_t*)(buf + 4), reply->error); cpu_to_be32w((uint32_t*)(buf + 4), reply->error);
cpu_to_be64w((uint64_t*)(buf + 8), reply->handle); cpu_to_be64w((uint64_t*)(buf + 8), reply->handle);
TRACE("Sending response to client"); TRACE("Sending response to client");
if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) {
LOG("writing to socket failed"); LOG("writing to socket failed");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
return 0; return 0;
} }
int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset, int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset,
off_t *offset, bool readonly, uint8_t *data, int data_size) off_t *offset, bool readonly, uint8_t *data, int data_size)
{ {
struct nbd_request request; struct nbd_request request;
struct nbd_reply reply; struct nbd_reply reply;
TRACE("Reading request."); TRACE("Reading request.");
if (nbd_receive_request(csock, &request) == -1) if (nbd_receive_request(csock, &request) == -1)
return -1; return -1;
if (request.len + NBD_REPLY_SIZE > data_size) { if (request.len + NBD_REPLY_SIZE > data_size) {
LOG("len (%u) is larger than max len (%u)", LOG("len (%u) is larger than max len (%u)",
request.len + NBD_REPLY_SIZE, data_size); request.len + NBD_REPLY_SIZE, data_size);
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
if ((request.from + request.len) < request.from) { if ((request.from + request.len) < request.from) {
LOG("integer overflow detected! " LOG("integer overflow detected! "
"you're probably being attacked"); "you're probably being attacked");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
if ((request.from + request.len) > size) { if ((request.from + request.len) > size) {
LOG("From: %" PRIu64 ", Len: %u, Size: %" PRIu64 LOG("From: %" PRIu64 ", Len: %u, Size: %" PRIu64
", Offset: %" PRIu64 "\n", ", Offset: %" PRIu64 "\n",
request.from, request.len, (uint64_t)size, dev_offset); request.from, request.len, (uint64_t)size, dev_offset);
LOG("requested operation past EOF--bad client?"); LOG("requested operation past EOF--bad client?");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
TRACE("Decoding type"); TRACE("Decoding type");
reply.handle = request.handle; reply.handle = request.handle;
reply.error = 0; reply.error = 0;
switch (request.type) { switch (request.type) {
case NBD_CMD_READ: case NBD_CMD_READ:
TRACE("Request type is READ"); TRACE("Request type is READ");
if (bdrv_read(bs, (request.from + dev_offset) / 512, if (bdrv_read(bs, (request.from + dev_offset) / 512,
data + NBD_REPLY_SIZE, data + NBD_REPLY_SIZE,
request.len / 512) == -1) { request.len / 512) == -1) {
LOG("reading from file failed"); LOG("reading from file failed");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
*offset += request.len; *offset += request.len;
TRACE("Read %u byte(s)", request.len); TRACE("Read %u byte(s)", request.len);
/* Reply /* Reply
[ 0 .. 3] magic (NBD_REPLY_MAGIC) [ 0 .. 3] magic (NBD_REPLY_MAGIC)
[ 4 .. 7] error (0 == no error) [ 4 .. 7] error (0 == no error)
[ 7 .. 15] handle [ 7 .. 15] handle
*/ */
cpu_to_be32w((uint32_t*)data, NBD_REPLY_MAGIC); cpu_to_be32w((uint32_t*)data, NBD_REPLY_MAGIC);
cpu_to_be32w((uint32_t*)(data + 4), reply.error); cpu_to_be32w((uint32_t*)(data + 4), reply.error);
cpu_to_be64w((uint64_t*)(data + 8), reply.handle); cpu_to_be64w((uint64_t*)(data + 8), reply.handle);
TRACE("Sending data to client"); TRACE("Sending data to client");
if (write_sync(csock, data, if (write_sync(csock, data,
request.len + NBD_REPLY_SIZE) != request.len + NBD_REPLY_SIZE) !=
request.len + NBD_REPLY_SIZE) { request.len + NBD_REPLY_SIZE) {
LOG("writing to socket failed"); LOG("writing to socket failed");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
break; break;
case NBD_CMD_WRITE: case NBD_CMD_WRITE:
TRACE("Request type is WRITE"); TRACE("Request type is WRITE");
TRACE("Reading %u byte(s)", request.len); TRACE("Reading %u byte(s)", request.len);
if (read_sync(csock, data, request.len) != request.len) { if (read_sync(csock, data, request.len) != request.len) {
LOG("reading from socket failed"); LOG("reading from socket failed");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
if (readonly) { if (readonly) {
TRACE("Server is read-only, return error"); TRACE("Server is read-only, return error");
reply.error = 1; reply.error = 1;
} else { } else {
TRACE("Writing to device"); TRACE("Writing to device");
if (bdrv_write(bs, (request.from + dev_offset) / 512, if (bdrv_write(bs, (request.from + dev_offset) / 512,
data, request.len / 512) == -1) { data, request.len / 512) == -1) {
LOG("writing to file failed"); LOG("writing to file failed");
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
*offset += request.len; *offset += request.len;
} }
if (nbd_send_reply(csock, &reply) == -1) if (nbd_send_reply(csock, &reply) == -1)
return -1; return -1;
break; break;
case NBD_CMD_DISC: case NBD_CMD_DISC:
TRACE("Request type is DISCONNECT"); TRACE("Request type is DISCONNECT");
errno = 0; errno = 0;
return 1; return 1;
default: default:
LOG("invalid request type (%u) received", request.type); LOG("invalid request type (%u) received", request.type);
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
TRACE("Request/Reply complete"); TRACE("Request/Reply complete");
return 0; return 0;
} }
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