mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-11-05 20:35:44 +00:00
Add a parameter to disable host cache, by Laurent Vivier.
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4836 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
ths
parent
23fb600b87
commit
2f7264888a
6 changed files with 40 additions and 24 deletions
5
Makefile
5
Makefile
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@ -177,8 +177,11 @@ qemu-img-%.o: %.c
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%.o: %.c
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$(CC) $(CFLAGS) $(CPPFLAGS) -c -o $@ $<
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qemu-nbd-%.o: %.c
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$(CC) $(CFLAGS) $(CPPFLAGS) -DQEMU_NBD -c -o $@ $<
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qemu-nbd$(EXESUF): qemu-nbd.o nbd.o qemu-img-block.o \
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$(QEMU_IMG_BLOCK_OBJS)
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osdep.o qemu-nbd-block-raw-posix.o $(BLOCK_OBJS)
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$(CC) $(LDFLAGS) -o $@ $^ -lz $(LIBS)
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# dyngen host tool
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@ -22,7 +22,7 @@
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* THE SOFTWARE.
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*/
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#include "qemu-common.h"
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#ifndef QEMU_IMG
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#if !defined(QEMU_IMG) && !defined(QEMU_NBD)
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#include "qemu-timer.h"
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#include "exec-all.h"
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#endif
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@ -59,7 +59,7 @@
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//#define DEBUG_FLOPPY
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//#define DEBUG_BLOCK
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#if defined(DEBUG_BLOCK) && !defined(QEMU_IMG)
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#if defined(DEBUG_BLOCK) && !defined(QEMU_IMG) && !defined(QEMU_NBD)
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#define DEBUG_BLOCK_PRINT(formatCstr, args...) do { if (loglevel != 0) \
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{ fprintf(logfile, formatCstr, ##args); fflush(logfile); } } while (0)
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#else
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@ -434,7 +434,7 @@ static int aio_initialized = 0;
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static void aio_signal_handler(int signum)
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{
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#ifndef QEMU_IMG
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#if !defined(QEMU_IMG) && !defined(QEMU_NBD)
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CPUState *env = cpu_single_env;
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if (env) {
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/* stop the currently executing cpu because a timer occured */
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@ -544,7 +544,7 @@ void qemu_aio_wait(void)
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sigset_t set;
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int nb_sigs;
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#ifndef QEMU_IMG
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#if !defined(QEMU_IMG) && !defined(QEMU_NBD)
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if (qemu_bh_poll())
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return;
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#endif
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@ -586,7 +586,7 @@ static RawAIOCB *raw_aio_setup(BlockDriverState *bs,
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return acb;
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}
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#ifndef QEMU_IMG
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#if !defined(QEMU_IMG) && !defined(QEMU_NBD)
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static void raw_aio_em_cb(void* opaque)
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{
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RawAIOCB *acb = opaque;
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@ -605,7 +605,7 @@ static BlockDriverAIOCB *raw_aio_read(BlockDriverState *bs,
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* If O_DIRECT is used and the buffer is not aligned fall back
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* to synchronous IO.
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*/
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#if defined(O_DIRECT) && !defined(QEMU_IMG)
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#if defined(O_DIRECT) && !defined(QEMU_IMG) && !defined(QEMU_NBD)
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BDRVRawState *s = bs->opaque;
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if (unlikely(s->aligned_buf != NULL && ((uintptr_t) buf % 512))) {
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@ -638,7 +638,7 @@ static BlockDriverAIOCB *raw_aio_write(BlockDriverState *bs,
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* If O_DIRECT is used and the buffer is not aligned fall back
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* to synchronous IO.
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*/
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#if defined(O_DIRECT) && !defined(QEMU_IMG)
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#if defined(O_DIRECT) && !defined(QEMU_IMG) && !defined(QEMU_NBD)
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BDRVRawState *s = bs->opaque;
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if (unlikely(s->aligned_buf != NULL && ((uintptr_t) buf % 512))) {
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@ -941,7 +941,7 @@ static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
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return 0;
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}
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#if defined(__linux__) && !defined(QEMU_IMG)
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#if defined(__linux__) && !defined(QEMU_IMG) && !defined(QEMU_NBD)
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/* Note: we do not have a reliable method to detect if the floppy is
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present. The current method is to try to open the floppy at every
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14
nbd.c
14
nbd.c
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@ -404,13 +404,9 @@ int nbd_client(int fd, int csock)
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return ret;
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}
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int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset, off_t *offset, bool readonly)
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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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{
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#ifndef _REENTRANT
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static uint8_t data[1024 * 1024]; // keep this off of the stack
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#else
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uint8_t data[1024 * 1024];
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#endif
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uint8_t buf[4 + 4 + 8 + 8 + 4];
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uint32_t magic;
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uint32_t type;
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@ -449,9 +445,9 @@ int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset, o
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return -1;
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}
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if (len > sizeof(data)) {
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LOG("len (%u) is larger than max len (%lu)",
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len, (unsigned long)sizeof(data));
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if (len > data_size) {
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LOG("len (%u) is larger than max len (%u)",
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len, data_size);
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errno = EINVAL;
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return -1;
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}
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3
nbd.h
3
nbd.h
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@ -33,7 +33,8 @@ int unix_socket_incoming(const char *path);
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int nbd_negotiate(BlockDriverState *bs, int csock, off_t size);
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int nbd_receive_negotiate(int csock, off_t *size, size_t *blocksize);
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int nbd_init(int fd, int csock, off_t size, size_t blocksize);
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int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset, off_t *offset, bool readonly);
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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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int nbd_client(int fd, int csock);
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int nbd_disconnect(int fd);
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22
qemu-nbd.c
22
qemu-nbd.c
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@ -34,6 +34,8 @@
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#define SOCKET_PATH "/var/lock/qemu-nbd-%s"
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#define NBD_BUFFER_SIZE (1024*1024)
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int verbose;
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static void usage(const char *name)
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@ -49,6 +51,8 @@ static void usage(const char *name)
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" (default '"SOCKET_PATH"')\n"
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" -r, --read-only export read-only\n"
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" -P, --partition=NUM only expose partition NUM\n"
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" -s, --snapshot use snapshot file\n"
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" -n, --nocache disable host cache\n"
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" -c, --connect=DEV connect FILE to the local NBD device DEV\n"
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" -d, --disconnect disconnect the specified device\n"
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" -v, --verbose display extra debugging information\n"
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@ -185,7 +189,7 @@ int main(int argc, char **argv)
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char *device = NULL;
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char *socket = NULL;
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char sockpath[128];
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const char *sopt = "hVbo:p:rsP:c:dvk:";
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const char *sopt = "hVbo:p:rsnP:c:dvk:";
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struct option lopt[] = {
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{ "help", 0, 0, 'h' },
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{ "version", 0, 0, 'V' },
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@ -198,6 +202,7 @@ int main(int argc, char **argv)
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{ "connect", 1, 0, 'c' },
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{ "disconnect", 0, 0, 'd' },
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{ "snapshot", 0, 0, 's' },
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{ "nocache", 0, 0, 'n' },
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{ "verbose", 0, 0, 'v' },
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{ NULL, 0, 0, 0 }
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};
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@ -205,15 +210,19 @@ int main(int argc, char **argv)
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int opt_ind = 0;
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int li;
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char *end;
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bool snapshot = false;
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int flags = 0;
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int partition = -1;
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int fd;
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int ret;
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uint8_t *data;
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while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
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switch (ch) {
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case 's':
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snapshot = true;
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flags |= BDRV_O_SNAPSHOT;
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break;
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case 'n':
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flags |= BDRV_O_DIRECT;
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break;
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case 'b':
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bindto = optarg;
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@ -301,7 +310,7 @@ int main(int argc, char **argv)
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if (bs == NULL)
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return 1;
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if (bdrv_open(bs, argv[optind], snapshot) == -1)
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if (bdrv_open(bs, argv[optind], flags) == -1)
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return 1;
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fd_size = bs->total_sectors * 512;
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@ -394,7 +403,10 @@ int main(int argc, char **argv)
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if (nbd_negotiate(bs, csock, fd_size) == -1)
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return 1;
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while (nbd_trip(bs, csock, fd_size, dev_offset, &offset, readonly) == 0);
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data = qemu_memalign(512, NBD_BUFFER_SIZE);
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while (nbd_trip(bs, csock, fd_size, dev_offset, &offset, readonly,
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data, NBD_BUFFER_SIZE) == 0);
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qemu_free(data);
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close(csock);
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close(sock);
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@ -26,6 +26,10 @@ Export Qemu disk image using NBD protocol.
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export read-only
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@item -P, --partition=NUM
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only expose partition NUM
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@item -s, --snapshot
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use snapshot file
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@item -n, --nocache
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disable host cache
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@item -c, --connect
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connect FILE to NBD device DEV
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@item -d, --disconnect
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