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[Qemu-devel] [PATCH 12/14] block: pass BDRV_BACKING flag to open of a ba
From: |
Uri Lublin |
Subject: |
[Qemu-devel] [PATCH 12/14] block: pass BDRV_BACKING flag to open of a backing file |
Date: |
Tue, 17 Mar 2009 22:40:50 +0200 |
There may exist some actions needed to be taken only by
the leaf image (and not backing images), such as keeping track
of highest-allocation-offset.
Signed-off-by: Uri Lublin <address@hidden>
---
block.c | 3 ++-
block.h | 2 ++
2 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/block.c b/block.c
index 39ff1dd..8d92d9e 100644
--- a/block.c
+++ b/block.c
@@ -415,7 +415,7 @@ int bdrv_open2(BlockDriverState *bs, const char *filename,
int flags,
/* Note: for compatibility, we open disk image files as RDWR, and
RDONLY as fallback */
if (!(flags & BDRV_O_FILE))
- open_flags = BDRV_O_RDWR | (flags & BDRV_O_CACHE_MASK);
+ open_flags = BDRV_O_RDWR | (flags & (BDRV_O_CACHE_MASK |
BDRV_O_BACKING));
else
open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
ret = drv->bdrv_open(bs, filename, open_flags);
@@ -446,6 +446,7 @@ int bdrv_open2(BlockDriverState *bs, const char *filename,
int flags,
bs->backing_hd = bdrv_new("");
path_combine(backing_filename, sizeof(backing_filename),
filename, bs->backing_file);
+ open_flags |= BDRV_O_BACKING;
if (bs->backing_format[0] != '\0')
back_drv = bdrv_find_format(bs->backing_format);
ret = bdrv_open2(bs->backing_hd, backing_filename, open_flags,
diff --git a/block.h b/block.h
index fbb445e..18147cf 100644
--- a/block.h
+++ b/block.h
@@ -56,6 +56,8 @@ typedef struct QEMUSnapshotInfo {
#define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_CACHE_WB |
BDRV_O_CACHE_DEF)
+#define BDRV_O_BACKING 0x0100 /* a backing file */
+
void bdrv_info(Monitor *mon);
void bdrv_info_stats(Monitor *mon);
--
1.6.0.6
- [Qemu-devel] [PATCH 02/14] block: support known backing format for image create and open, (continued)
- [Qemu-devel] [PATCH 02/14] block: support known backing format for image create and open, Uri Lublin, 2009/03/17
- [Qemu-devel] [PATCH 03/14] block-qcow2: keep backing file format in a qcow2 extension, Uri Lublin, 2009/03/17
- [Qemu-devel] [PATCH 04/14] qemu-img: adding a "-F base_fmt" option to "qemu-img create -b", Uri Lublin, 2009/03/17
- [Qemu-devel] [PATCH 05/14] block-qcow2: keep highest allocated offset, Uri Lublin, 2009/03/17
- [Qemu-devel] [PATCH 06/14] block-qcow2: export highest-alloc through BlockDriverInfo and get_info(), Uri Lublin, 2009/03/17
- [Qemu-devel] [PATCH 07/14] block: info blockstats: show highest_allocated if exists, Uri Lublin, 2009/03/17
- [Qemu-devel] [PATCH 08/14] Add a bdrv_close_all() and call it at the end of main(), Uri Lublin, 2009/03/17
- [Qemu-devel] [PATCH 09/14] block-qcow2: keep highest alloc offset in a qcow2 extension, Uri Lublin, 2009/03/17
- [Qemu-devel] [PATCH 10/14] qemu-img: info: show highest_alloc if exists, Uri Lublin, 2009/03/17
- [Qemu-devel] [PATCH 11/14] qcow2: qcow_read_extensions: make "advance offset over extension" common, Uri Lublin, 2009/03/17
- [Qemu-devel] [PATCH 12/14] block: pass BDRV_BACKING flag to open of a backing file,
Uri Lublin <=
- [Qemu-devel] [PATCH 13/14] block: keep flags an image was opened with, Uri Lublin, 2009/03/17
- [Qemu-devel] [PATCH 14/14] block-qcow2: do not keep track of highest-alloc for backing files, Uri Lublin, 2009/03/17
Re: [Qemu-devel] [PATCH 00/14] block (mostly qcow2) changes (v6), Gleb Natapov, 2009/03/24