@@ -432,7 +432,7 @@ DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi)
const char *devaddr;
DriveInfo *dinfo;
int snapshot = 0;
- int copy_on_read;
+ int copy_on_read, stream;
int ret;
translation = BIOS_ATA_TRANSLATION_AUTO;
@@ -450,6 +450,7 @@ DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi)
snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
ro = qemu_opt_get_bool(opts, "readonly", 0);
copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", 0);
+ stream = qemu_opt_get_bool(opts, "stream", 0);
file = qemu_opt_get(opts, "file");
serial = qemu_opt_get(opts, "serial");
@@ -737,6 +738,15 @@ DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi)
goto err;
}
+ if (stream) {
+ const char *device_name = bdrv_get_device_name(dinfo->bdrv);
+
+ if (!stream_start(device_name)) {
+ fprintf(stderr, "qemu: warning: stream_start failed for '%s'\n",
+ device_name);
+ }
+ }
+
if (bdrv_key_required(dinfo->bdrv))
autostart = 0;
return dinfo;
@@ -909,7 +909,8 @@ ETEXI
"[,unit=m][,media=d][,index=i]\n"
"[,cyls=c,heads=h,secs=s[,trans=t]]\n"
"[,snapshot=on|off][,cache=on|off]\n"
- "[,readonly=on|off][,copy-on-read=on|off]",
+ "[,readonly=on|off][,copy-on-read=on|off]"
+ "[,stream=on|off]",
.help = "add drive to PCI storage controller",
.mhandler.cmd = drive_hot_add,
},
@@ -88,6 +88,10 @@ static QemuOptsList qemu_drive_opts = {
.name = "copy-on-read",
.type = QEMU_OPT_BOOL,
.help = "copy read data from backing file into image file",
+ },{
+ .name = "stream",
+ .type = QEMU_OPT_BOOL,
+ .help = "copy backing file data into image file while guest runs",
},
{ /* end of list */ }
},
@@ -135,7 +135,7 @@ DEF("drive", HAS_ARG, QEMU_OPTION_drive,
" [,cyls=c,heads=h,secs=s[,trans=t]][,snapshot=on|off]\n"
" [,cache=writethrough|writeback|none|unsafe][,format=f]\n"
" [,serial=s][,addr=A][,id=name][,aio=threads|native]\n"
- " [,readonly=on|off][,copy-on-read=on|off]\n"
+ " [,readonly=on|off][,copy-on-read=on|off][,stream=on|off]\n"
" use 'file' as a drive image\n", QEMU_ARCH_ALL)
STEXI
@item -drive @var{option}[,@var{option}[,@var{option}[,...]]]
@@ -186,6 +186,9 @@ Open drive @option{file} as read-only. Guest write attempts will fail.
@item copy-on-read=@var{copy-on-read}
@var{copy-on-read} is "on" or "off" and enables whether to copy read backing
file sectors into the image file.
+@item stream=@var{stream}
+@var{stream} is "on" or "off" and enables background copying of backing file
+contents into the image file until the backing file is no longer needed.
@end table
By default, writethrough caching is used for all block device. This means that
This patch adds the -drive stream=on|off command-line option: stream=on|off stream is "on" or "off" and enables background copying of backing file contents into the image file until the backing file is no longer needed. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> --- blockdev.c | 12 +++++++++++- hmp-commands.hx | 3 ++- qemu-config.c | 4 ++++ qemu-options.hx | 5 ++++- 4 files changed, 21 insertions(+), 3 deletions(-)