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[Qemu-devel] [PATCH v2] block: allow resizing of images residing on host
From: |
Christoph Hellwig |
Subject: |
[Qemu-devel] [PATCH v2] block: allow resizing of images residing on host devices |
Date: |
Wed, 21 Sep 2011 01:10:37 +0200 |
User-agent: |
Mutt/1.5.17 (2007-11-01) |
Allow to resize images that reside on host devices up to the available
space. This allows to grow images after resizing the device manually or
vice versa.
Signed-off-by: Christoph Hellwig <address@hidden>
Index: qemu/block/raw-posix.c
===================================================================
--- qemu.orig/block/raw-posix.c 2011-09-20 13:56:02.422662877 -0400
+++ qemu/block/raw-posix.c 2011-09-20 18:56:23.647165015 -0400
@@ -649,10 +649,24 @@ static void raw_close(BlockDriverState *
static int raw_truncate(BlockDriverState *bs, int64_t offset)
{
BDRVRawState *s = bs->opaque;
- if (s->type != FTYPE_FILE)
- return -ENOTSUP;
- if (ftruncate(s->fd, offset) < 0)
+ struct stat st;
+
+ if (fstat(s->fd, &st)) {
return -errno;
+ }
+
+ if (S_ISREG(st.st_mode)) {
+ if (ftruncate(s->fd, offset) < 0) {
+ return -errno;
+ }
+ } else if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
+ if (offset > raw_getlength(bs)) {
+ return -EINVAL;
+ }
+ } else {
+ return -ENOTSUP;
+ }
+
return 0;
}
@@ -1171,6 +1185,7 @@ static BlockDriver bdrv_host_device = {
.bdrv_read = raw_read,
.bdrv_write = raw_write,
+ .bdrv_truncate = raw_truncate,
.bdrv_getlength = raw_getlength,
.bdrv_get_allocated_file_size
= raw_get_allocated_file_size,
@@ -1292,6 +1307,7 @@ static BlockDriver bdrv_host_floppy = {
.bdrv_read = raw_read,
.bdrv_write = raw_write,
+ .bdrv_truncate = raw_truncate,
.bdrv_getlength = raw_getlength,
.bdrv_get_allocated_file_size
= raw_get_allocated_file_size,
@@ -1393,6 +1409,7 @@ static BlockDriver bdrv_host_cdrom = {
.bdrv_read = raw_read,
.bdrv_write = raw_write,
+ .bdrv_truncate = raw_truncate,
.bdrv_getlength = raw_getlength,
.bdrv_get_allocated_file_size
= raw_get_allocated_file_size,
@@ -1514,6 +1531,7 @@ static BlockDriver bdrv_host_cdrom = {
.bdrv_read = raw_read,
.bdrv_write = raw_write,
+ .bdrv_truncate = raw_truncate,
.bdrv_getlength = raw_getlength,
.bdrv_get_allocated_file_size
= raw_get_allocated_file_size,
- [Qemu-devel] [PATCH v2] block: allow resizing of images residing on host devices,
Christoph Hellwig <=