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qemu-img info: show nocow info

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Add nocow info in 'qemu-img info' output to show whether the file
currently has NOCOW flag set or not.

Signed-off-by: Chunyan Liu <cyliu@suse.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Chunyan Liu 2014-07-30 10:55:06 +08:00 • committed by Kevin Wolf
parent c6ac36e145
commit 000c4dfff4
2 changed files with 30 additions and 1 deletions
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26
block/qapi.c
View file

@ -28,6 +28,13 @@
#include "qapi-visit.h"
#include "qapi/qmp-output-visitor.h"
#include "qapi/qmp/types.h"
#ifdef __linux__
#include <linux/fs.h>
#include <sys/ioctl.h>
#ifndef FS_NOCOW_FL
#define FS_NOCOW_FL 0x00800000 /* Do not cow file */
#endif
#endif
BlockDeviceInfo *bdrv_block_device_info(BlockDriverState *bs)
{
@ -172,6 +179,9 @@ void bdrv_query_image_info(BlockDriverState *bs,
int ret;
Error *err = NULL;
ImageInfo *info;
#ifdef __linux__
int fd, attr;
#endif
size = bdrv_getlength(bs);
if (size < 0) {
@ -201,6 +211,18 @@ void bdrv_query_image_info(BlockDriverState *bs,
info->format_specific = bdrv_get_specific_info(bs);
info->has_format_specific = info->format_specific != NULL;
#ifdef __linux__
/* get NOCOW info */
fd = qemu_open(bs->filename, O_RDONLY | O_NONBLOCK);
if (fd >= 0) {
if (ioctl(fd, FS_IOC_GETFLAGS, &attr) == 0 && (attr & FS_NOCOW_FL)) {
info->has_nocow = true;
info->nocow = true;
}
qemu_close(fd);
}
#endif
backing_filename = bs->backing_file;
if (backing_filename[0] != '\0') {
info->backing_filename = g_strdup(backing_filename);
@ -631,4 +653,8 @@ void bdrv_image_info_dump(fprintf_function func_fprintf, void *f,
func_fprintf(f, "Format specific information:\n");
bdrv_image_info_specific_dump(func_fprintf, f, info->format_specific);
}
if (info->has_nocow && info->nocow) {
func_fprintf(f, "NOCOW flag: set\n");
}
}