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[Qemu-devel] [PULL 16/41] qemu-img: add support for fully allocated imag
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] [PULL 16/41] qemu-img: add support for fully allocated images |
Date: |
Fri, 29 Nov 2013 17:45:31 +0100 |
From: Peter Lieven <address@hidden>
Signed-off-by: Peter Lieven <address@hidden>
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
qemu-img.c | 10 +++++++---
qemu-img.texi | 6 ++++++
2 files changed, 13 insertions(+), 3 deletions(-)
diff --git a/qemu-img.c b/qemu-img.c
index b6b5644..cc3fed7 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -100,8 +100,12 @@ static void help(void)
" '-h' with or without a command shows this help and lists the
supported formats\n"
" '-p' show progress of command (only certain commands)\n"
" '-q' use Quiet mode - do not print any output (except errors)\n"
- " '-S' indicates the consecutive number of bytes that must contain
only zeros\n"
- " for qemu-img to create a sparse image during conversion\n"
+ " '-S' indicates the consecutive number of bytes (defaults to 4k)
that must\n"
+ " contain only zeros for qemu-img to create a sparse image
during\n"
+ " conversion. If the number of bytes is 0, the source will
not be scanned for\n"
+ " unallocated or zero sectors, and the destination image will
always be\n"
+ " fully allocated\n"
+ " images will always be fully allocated\n"
" '--output' takes the format in which the output must be done
(human or json)\n"
" '-n' skips the target volume creation (useful if the volume is
created\n"
" prior to running qemu-img)\n"
@@ -1465,7 +1469,7 @@ static int img_convert(int argc, char **argv)
/* signal EOF to align */
bdrv_write_compressed(out_bs, 0, NULL, 0);
} else {
- int has_zero_init = bdrv_has_zero_init(out_bs);
+ int has_zero_init = min_sparse ? bdrv_has_zero_init(out_bs) : 0;
sector_num = 0; // total number of sectors converted so far
nb_sectors = total_sectors - sector_num;
diff --git a/qemu-img.texi b/qemu-img.texi
index 768054e..da36975 100644
--- a/qemu-img.texi
+++ b/qemu-img.texi
@@ -193,6 +193,12 @@ Image conversion is also useful to get smaller image when
using a
growable format such as @code{qcow} or @code{cow}: the empty sectors
are detected and suppressed from the destination image.
address@hidden indicates the consecutive number of bytes (defaults to 4k)
+that must contain only zeros for qemu-img to create a sparse image during
+conversion. If @var{sparse_size} is 0, the source will not be scanned for
+unallocated or zero sectors, and the destination image will always be
+fully allocated.
+
You can use the @var{backing_file} option to force the output image to be
created as a copy on write image of the specified base image; the
@var{backing_file} should have the same content as the input's base image,
--
1.8.1.4
- [Qemu-devel] [PULL 06/41] block/iscsi: add .bdrv_get_info, (continued)
- [Qemu-devel] [PULL 06/41] block/iscsi: add .bdrv_get_info, Kevin Wolf, 2013/11/29
- [Qemu-devel] [PULL 05/41] block: add wrappers for logical block provisioning information, Kevin Wolf, 2013/11/29
- [Qemu-devel] [PULL 08/41] block/raw: copy BlockLimits on raw_open, Kevin Wolf, 2013/11/29
- [Qemu-devel] [PULL 09/41] block: honour BlockLimits in bdrv_co_do_write_zeroes, Kevin Wolf, 2013/11/29
- [Qemu-devel] [PULL 10/41] block: honour BlockLimits in bdrv_co_discard, Kevin Wolf, 2013/11/29
- [Qemu-devel] [PULL 11/41] iscsi: set limits in BlockDriverState, Kevin Wolf, 2013/11/29
- [Qemu-devel] [PULL 12/41] iscsi: simplify iscsi_co_discard, Kevin Wolf, 2013/11/29
- [Qemu-devel] [PULL 13/41] iscsi: add bdrv_co_write_zeroes, Kevin Wolf, 2013/11/29
- [Qemu-devel] [PULL 14/41] block: introduce bdrv_make_zero, Kevin Wolf, 2013/11/29
- [Qemu-devel] [PULL 15/41] block/get_block_status: fix BDRV_BLOCK_ZERO for unallocated blocks, Kevin Wolf, 2013/11/29
- [Qemu-devel] [PULL 16/41] qemu-img: add support for fully allocated images,
Kevin Wolf <=
- [Qemu-devel] [PULL 17/41] qemu-img: conditionally zero out target on convert, Kevin Wolf, 2013/11/29
- [Qemu-devel] [PULL 18/41] util/error: Save errno from clobbering, Kevin Wolf, 2013/11/29
- [Qemu-devel] [PULL 19/41] Test coroutine execution order, Kevin Wolf, 2013/11/29
- [Qemu-devel] [PULL 20/41] sheepdog: implement .bdrv_get_allocated_file_size, Kevin Wolf, 2013/11/29
- [Qemu-devel] [PULL 21/41] block/stream: Don't stream unbacked devices, Kevin Wolf, 2013/11/29
- [Qemu-devel] [PULL 22/41] block: per caller dirty bitmap, Kevin Wolf, 2013/11/29
- [Qemu-devel] [PULL 24/41] COW: Speed up writes, Kevin Wolf, 2013/11/29
- [Qemu-devel] [PULL 25/41] COW: Extend checking allocated bits to beyond one sector, Kevin Wolf, 2013/11/29
- [Qemu-devel] [PULL 26/41] MAINTAINERS: add sheepdog development mailing list, Kevin Wolf, 2013/11/29
- [Qemu-devel] [PULL 23/41] qapi: Change BlockDirtyInfo to list, Kevin Wolf, 2013/11/29