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[Qemu-devel] [PATCHv4 15/17] qemu-img: add support for fully allocated i
From: |
Peter Lieven |
Subject: |
[Qemu-devel] [PATCHv4 15/17] qemu-img: add support for fully allocated images |
Date: |
Tue, 8 Oct 2013 13:58:09 +0200 |
Signed-off-by: Peter Lieven <address@hidden>
---
qemu-img.c | 8 +++++---
qemu-img.texi | 5 +++++
2 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/qemu-img.c b/qemu-img.c
index 926f0a0..c6eff15 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -100,8 +100,10 @@ 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 sparse files are
disabled and\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 +1467,7 @@ 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..51a1ee5 100644
--- a/qemu-img.texi
+++ b/qemu-img.texi
@@ -193,6 +193,11 @@ 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 the number of bytes is 0 sparse files are disabled and
+images 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
- Re: [Qemu-devel] [PATCHv4 14/17] block/get_block_status: fix BDRV_BLOCK_ZERO for unallocated blocks, (continued)
- Re: [Qemu-devel] [PATCHv4 14/17] block/get_block_status: fix BDRV_BLOCK_ZERO for unallocated blocks, Peter Lieven, 2013/10/18
- Re: [Qemu-devel] [PATCHv4 14/17] block/get_block_status: fix BDRV_BLOCK_ZERO for unallocated blocks, Paolo Bonzini, 2013/10/18
- Re: [Qemu-devel] [PATCHv4 14/17] block/get_block_status: fix BDRV_BLOCK_ZERO for unallocated blocks, Peter Lieven, 2013/10/18
- Re: [Qemu-devel] [PATCHv4 14/17] block/get_block_status: fix BDRV_BLOCK_ZERO for unallocated blocks, Stefan Hajnoczi, 2013/10/30
- Re: [Qemu-devel] [PATCHv4 14/17] block/get_block_status: fix BDRV_BLOCK_ZERO for unallocated blocks, Peter Lieven, 2013/10/30
- Re: [Qemu-devel] [PATCHv4 14/17] block/get_block_status: fix BDRV_BLOCK_ZERO for unallocated blocks, Peter Lieven, 2013/10/18
[Qemu-devel] [PATCHv4 12/17] iscsi: add bdrv_co_write_zeroes, Peter Lieven, 2013/10/08
[Qemu-devel] [PATCHv4 13/17] block: introduce bdrv_make_zero, Peter Lieven, 2013/10/08
[Qemu-devel] [PATCHv4 16/17] qemu-img: conditionally zero out target on convert, Peter Lieven, 2013/10/08
[Qemu-devel] [PATCHv4 15/17] qemu-img: add support for fully allocated images,
Peter Lieven <=
[Qemu-devel] [PATCHv4 17/17] block/raw: copy BlockLimits on raw_open, Peter Lieven, 2013/10/08