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[Qemu-devel] [PATCH v13 05/14] block: Add bdrv_set_backing_hd()
From: |
Fam Zheng |
Subject: |
[Qemu-devel] [PATCH v13 05/14] block: Add bdrv_set_backing_hd() |
Date: |
Wed, 29 Jan 2014 13:07:32 +0800 |
This is the common but non-trivial steps to assign or change the
backing_hd of BDS.
Signed-off-by: Fam Zheng <address@hidden>
---
block.c | 34 +++++++++++++++++++++++++---------
include/block/block.h | 1 +
2 files changed, 26 insertions(+), 9 deletions(-)
diff --git a/block.c b/block.c
index 8000ac0..c4eaa37 100644
--- a/block.c
+++ b/block.c
@@ -1072,6 +1072,26 @@ fail:
return ret;
}
+void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd)
+{
+ if (bs->backing_hd) {
+ bdrv_unref(bs->backing_hd);
+ }
+
+ bs->backing_hd = backing_hd;
+ if (!backing_hd) {
+ bs->backing_file[0] = '\0';
+ bs->backing_format[0] = '\0';
+ goto out;
+ }
+ pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_hd->filename);
+ pstrcpy(bs->backing_format, sizeof(bs->backing_file),
+ backing_hd->drv ? backing_hd->drv->format_name : "");
+ bdrv_ref(bs->backing_hd);
+out:
+ bdrv_refresh_limits(bs);
+}
+
/*
* Opens the backing file for a BlockDriverState if not yet open
*
@@ -1085,6 +1105,7 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict
*options, Error **errp)
char backing_filename[PATH_MAX];
int back_flags, ret;
BlockDriver *back_drv = NULL;
+ BlockDriverState *backing_hd;
Error *local_err = NULL;
if (bs->backing_hd != NULL) {
@@ -1108,7 +1129,7 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict
*options, Error **errp)
sizeof(backing_filename));
}
- bs->backing_hd = bdrv_new("");
+ backing_hd = bdrv_new("");
if (bs->backing_format[0] != '\0') {
back_drv = bdrv_find_format(bs->backing_format);
@@ -1118,23 +1139,18 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict
*options, Error **errp)
back_flags = bs->open_flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT |
BDRV_O_COPY_ON_READ);
- ret = bdrv_open(bs->backing_hd,
+ ret = bdrv_open(backing_hd,
*backing_filename ? backing_filename : NULL, options,
back_flags, back_drv, &local_err);
if (ret < 0) {
- bdrv_unref(bs->backing_hd);
- bs->backing_hd = NULL;
+ bdrv_unref(backing_hd);
bs->open_flags |= BDRV_O_NO_BACKING;
error_setg(errp, "Could not open backing file: %s",
error_get_pretty(local_err));
error_free(local_err);
return ret;
}
-
- if (bs->backing_hd->file) {
- pstrcpy(bs->backing_file, sizeof(bs->backing_file),
- bs->backing_hd->file->filename);
- }
+ bdrv_set_backing_hd(bs, backing_hd);
/* Recalculate the BlockLimits with the backing file */
bdrv_refresh_limits(bs);
diff --git a/include/block/block.h b/include/block/block.h
index 9125bbe..f449753 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -208,6 +208,7 @@ int bdrv_file_open(BlockDriverState **pbs, const char
*filename,
int bdrv_open_image(BlockDriverState **pbs, const char *filename,
QDict *options, const char *bdref_key, int flags,
bool force_raw, bool allow_none, Error **errp);
+void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd);
int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp);
int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
int flags, BlockDriver *drv, Error **errp);
--
1.8.5.3
- [Qemu-devel] [PATCH v13 00/14] Drop in_use from BlockDriverState and enable point-in-time snapshot exporting over NBD, Fam Zheng, 2014/01/29
- [Qemu-devel] [PATCH v13 01/14] block: Add BlockOpType enum, Fam Zheng, 2014/01/29
- [Qemu-devel] [PATCH v13 02/14] block: Introduce op_blockers to BlockDriverState, Fam Zheng, 2014/01/29
- [Qemu-devel] [PATCH v13 03/14] block: Replace in_use with operation blocker, Fam Zheng, 2014/01/29
- [Qemu-devel] [PATCH v13 04/14] block: Move op_blocker check from block_job_create to its caller, Fam Zheng, 2014/01/29
- [Qemu-devel] [PATCH v13 05/14] block: Add bdrv_set_backing_hd(),
Fam Zheng <=
- [Qemu-devel] [PATCH v13 06/14] block: Add backing_blocker in BlockDriverState, Fam Zheng, 2014/01/29
- [Qemu-devel] [PATCH v13 07/14] block: Parse "backing" option to reference existing BDS, Fam Zheng, 2014/01/29
- [Qemu-devel] [PATCH v13 08/14] block: Support dropping active in bdrv_drop_intermediate, Fam Zheng, 2014/01/29
- [Qemu-devel] [PATCH v13 09/14] stream: Use bdrv_drop_intermediate and drop close_unused_images, Fam Zheng, 2014/01/29
- [Qemu-devel] [PATCH v13 10/14] qmp: Add command 'blockdev-backup', Fam Zheng, 2014/01/29
- [Qemu-devel] [PATCH v13 11/14] block: Allow backup on referenced named BlockDriverState, Fam Zheng, 2014/01/29
- [Qemu-devel] [PATCH v13 12/14] block: Add blockdev-backup to transaction, Fam Zheng, 2014/01/29
- [Qemu-devel] [PATCH v13 13/14] qemu-iotests: Test blockdev-backup in 055, Fam Zheng, 2014/01/29
- [Qemu-devel] [PATCH v13 14/14] qemu-iotests: Image fleecing test case 081, Fam Zheng, 2014/01/29
- Re: [Qemu-devel] [PATCH v13 00/14] Drop in_use from BlockDriverState and enable point-in-time snapshot exporting over NBD, Ian Main, 2014/01/31