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[Qemu-devel] [PATCHv7 16/17] qemu-img: add support for fully allocated i
From: |
Peter Lieven |
Subject: |
[Qemu-devel] [PATCHv7 16/17] qemu-img: add support for fully allocated images |
Date: |
Thu, 24 Oct 2013 12:07:05 +0200 |
Signed-off-by: Peter Lieven <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 926f0a0..7f08364 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,
--
1.7.9.5
- [Qemu-devel] [PATCHv7 06/17] block/iscsi: add .bdrv_get_info, (continued)
- [Qemu-devel] [PATCHv7 06/17] block/iscsi: add .bdrv_get_info, Peter Lieven, 2013/10/24
- [Qemu-devel] [PATCHv7 05/17] block: add wrappers for logical block provisioning information, Peter Lieven, 2013/10/24
- [Qemu-devel] [PATCHv7 08/17] block/raw: copy BlockLimits on raw_open, Peter Lieven, 2013/10/24
- [Qemu-devel] [PATCHv7 07/17] block: add BlockLimits structure to BlockDriverState, Peter Lieven, 2013/10/24
- [Qemu-devel] [PATCHv7 11/17] iscsi: set limits in BlockDriverState, Peter Lieven, 2013/10/24
- [Qemu-devel] [PATCHv7 10/17] block: honour BlockLimits in bdrv_co_discard, Peter Lieven, 2013/10/24
- [Qemu-devel] [PATCHv7 09/17] block: honour BlockLimits in bdrv_co_do_write_zeroes, Peter Lieven, 2013/10/24
- [Qemu-devel] [PATCHv7 12/17] iscsi: simplify iscsi_co_discard, Peter Lieven, 2013/10/24
- [Qemu-devel] [PATCHv7 13/17] iscsi: add bdrv_co_write_zeroes, Peter Lieven, 2013/10/24
- [Qemu-devel] [PATCHv7 14/17] block: introduce bdrv_make_zero, Peter Lieven, 2013/10/24
- [Qemu-devel] [PATCHv7 16/17] qemu-img: add support for fully allocated images,
Peter Lieven <=
- [Qemu-devel] [PATCHv7 15/17] block/get_block_status: fix BDRV_BLOCK_ZERO for unallocated blocks, Peter Lieven, 2013/10/24
- [Qemu-devel] [PATCHv7 17/17] qemu-img: conditionally zero out target on convert, Peter Lieven, 2013/10/24
- Re: [Qemu-devel] [PATCHv7 00/17] block: logical block provisioning enhancements, Paolo Bonzini, 2013/10/24