diff options
| -rw-r--r-- | block/qapi.c | 26 | ||||
| -rw-r--r-- | qapi/block-core.json | 5 |
2 files changed, 30 insertions, 1 deletions
diff --git a/block/qapi.c b/block/qapi.c index 28ebb62c8e..79d1e6a9f4 100644 --- a/block/qapi.c +++ b/block/qapi.c @@ -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"); + } } diff --git a/qapi/block-core.json b/qapi/block-core.json index e378653a77..72b4015fb4 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -115,6 +115,8 @@ # @format-specific: #optional structure supplying additional format-specific # information (since 1.7) # +# @nocow: #optional info of whether NOCOW flag is set or not. (since 2.2) +# # Since: 1.3 # ## @@ -126,7 +128,8 @@ '*backing-filename': 'str', '*full-backing-filename': 'str', '*backing-filename-format': 'str', '*snapshots': ['SnapshotInfo'], '*backing-image': 'ImageInfo', - '*format-specific': 'ImageInfoSpecific' } } + '*format-specific': 'ImageInfoSpecific', + '*nocow': 'bool' } } ## # @ImageCheck: |