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block/file: Add file-specific image info

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Add some (optional) information that the file driver can provide for
image files, namely the extent size hint.

Signed-off-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20220620162704.80987-3-hreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Hanna Reitz 2022-06-20 18:26:54 +02:00 • committed by Kevin Wolf
parent 3716470b24
commit 7f36a50ab4
2 changed files with 54 additions and 2 deletions
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30
block/file-posix.c
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@ -3092,6 +3092,34 @@ raw_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
return 0;
}
static ImageInfoSpecific *raw_get_specific_info(BlockDriverState *bs,
Error **errp)
{
ImageInfoSpecificFile *file_info = g_new0(ImageInfoSpecificFile, 1);
ImageInfoSpecific *spec_info = g_new(ImageInfoSpecific, 1);
*spec_info = (ImageInfoSpecific){
.type = IMAGE_INFO_SPECIFIC_KIND_FILE,
.u.file.data = file_info,
};
#ifdef FS_IOC_FSGETXATTR
{
BDRVRawState *s = bs->opaque;
struct fsxattr attr;
int ret;
ret = ioctl(s->fd, FS_IOC_FSGETXATTR, &attr);
if (!ret && attr.fsx_extsize != 0) {
file_info->has_extent_size_hint = true;
file_info->extent_size_hint = attr.fsx_extsize;
}
}
#endif
return spec_info;
}
static BlockStatsSpecificFile get_blockstats_specific_file(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
@ -3325,6 +3353,7 @@ BlockDriver bdrv_file = {
.bdrv_co_truncate = raw_co_truncate,
.bdrv_co_getlength = raw_co_getlength,
.bdrv_co_get_info = raw_co_get_info,
.bdrv_get_specific_info = raw_get_specific_info,
.bdrv_co_get_allocated_file_size = raw_co_get_allocated_file_size,
.bdrv_get_specific_stats = raw_get_specific_stats,
.bdrv_check_perm = raw_check_perm,
@ -3696,6 +3725,7 @@ static BlockDriver bdrv_host_device = {
.bdrv_co_truncate = raw_co_truncate,
.bdrv_co_getlength = raw_co_getlength,
.bdrv_co_get_info = raw_co_get_info,
.bdrv_get_specific_info = raw_get_specific_info,
.bdrv_co_get_allocated_file_size = raw_co_get_allocated_file_size,
.bdrv_get_specific_stats = hdev_get_specific_stats,
.bdrv_check_perm = raw_check_perm,