From: Wolfgang Bumiller <w.bumiller@proxmox.com>
To: qemu-devel@nongnu.org
Cc: Kevin Wolf <kwolf@redhat.com>, Stefan Hajnoczi <stefanha@redhat.com>
Subject: [Qemu-devel] [PATCH] vvfat: add a label option
Date: Thu, 18 Jun 2015 16:08:41 +0200 [thread overview]
Message-ID: <1434636521-24426-1-git-send-email-w.bumiller@proxmox.com> (raw)
Till now the vvfat filesystem's label was hardcoded to be
"QEMU VVFAT", now you can pass a file.label=labelname option
to the -drive to change it.
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
---
block/vvfat.c | 25 ++++++++++++++++++++++---
qapi/block-core.json | 3 ++-
2 files changed, 24 insertions(+), 4 deletions(-)
diff --git a/block/vvfat.c b/block/vvfat.c
index e803589..d407e37 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -322,6 +322,7 @@ typedef struct BDRVVVFATState {
int fat_type; /* 16 or 32 */
array_t fat,directory,mapping;
+ char volume_label[11];
unsigned int cluster_size;
unsigned int sectors_per_cluster;
@@ -859,7 +860,7 @@ static int init_directories(BDRVVVFATState* s,
{
direntry_t* entry=array_get_next(&(s->directory));
entry->attributes=0x28; /* archive | volume label */
- memcpy(entry->name, "QEMU VVFAT ", sizeof(entry->name));
+ memcpy(entry->name, s->volume_label, sizeof(entry->name));
}
/* Now build FAT, and write back information into directory */
@@ -968,7 +969,8 @@ static int init_directories(BDRVVVFATState* s,
bootsector->u.fat16.signature=0x29;
bootsector->u.fat16.id=cpu_to_le32(0xfabe1afd);
- memcpy(bootsector->u.fat16.volume_label,"QEMU VVFAT ",11);
+ memcpy(bootsector->u.fat16.volume_label, s->volume_label,
+ sizeof(bootsector->u.fat16.volume_label));
memcpy(bootsector->fat_type,(s->fat_type==12?"FAT12 ":s->fat_type==16?"FAT16 ":"FAT32 "),8);
bootsector->magic[0]=0x55; bootsector->magic[1]=0xaa;
@@ -1008,6 +1010,11 @@ static QemuOptsList runtime_opts = {
.help = "Create a floppy rather than a hard disk image",
},
{
+ .name = "label",
+ .type = QEMU_OPT_STRING,
+ .help = "Use a partition label other than QEMU VVFAT",
+ },
+ {
.name = "rw",
.type = QEMU_OPT_BOOL,
.help = "Make the image writable",
@@ -1069,7 +1076,7 @@ static int vvfat_open(BlockDriverState *bs, QDict *options, int flags,
BDRVVVFATState *s = bs->opaque;
int cyls, heads, secs;
bool floppy;
- const char *dirname;
+ const char *dirname, *label;
QemuOpts *opts;
Error *local_err = NULL;
int ret;
@@ -1096,6 +1103,18 @@ static int vvfat_open(BlockDriverState *bs, QDict *options, int flags,
s->fat_type = qemu_opt_get_number(opts, "fat-type", 0);
floppy = qemu_opt_get_bool(opts, "floppy", false);
+ memset(s->volume_label, ' ', sizeof(s->volume_label));
+ label = qemu_opt_get(opts, "label");
+ if (label) {
+ size_t label_length = strlen(label);
+ if (label_length > 11) {
+ error_setg(errp, "vvfat label cannot be longer than 11 bytes");
+ ret = -EINVAL;
+ goto fail;
+ }
+ memcpy(s->volume_label, label, label_length);
+ }
+
if (floppy) {
/* 1.44MB or 2.88MB floppy. 2.88MB can be FAT12 (default) or FAT16. */
if (!s->fat_type) {
diff --git a/qapi/block-core.json b/qapi/block-core.json
index afa9d3d..2a529b1 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -1453,13 +1453,14 @@
# @fat-type: #optional FAT type: 12, 16 or 32
# @floppy: #optional whether to export a floppy image (true) or
# partitioned hard disk (false; default)
+# @label: #optional override default label
# @rw: #optional whether to allow write operations (default: false)
#
# Since: 1.7
##
{ 'struct': 'BlockdevOptionsVVFAT',
'data': { 'dir': 'str', '*fat-type': 'int', '*floppy': 'bool',
- '*rw': 'bool' } }
+ '*label': 'str', '*rw': 'bool' } }
##
# @BlockdevOptionsGenericFormat
--
2.1.4
next reply other threads:[~2015-06-18 14:19 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-18 14:08 Wolfgang Bumiller [this message]
2015-06-18 16:09 ` [Qemu-devel] [PATCH] vvfat: add a label option Stefan Hajnoczi
2015-06-18 21:01 ` Eric Blake
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