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X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: fam@euphon.net, kwolf@redhat.com, den@openvz.org, qemu-devel@nongnu.org, mreitz@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 8/7/19 10:12 AM, Vladimir Sementsov-Ogievskiy wrote: > - Correct check for write access to file child, and in correct place > (only if we want to write). > - Support reopen rw -> rw (which will be used in following commit), > for example, !bdrv_dirty_bitmap_readonly() is not a corruption if > bitmap is marked IN_USE in the image. > - Consider unexpected bitmap as a corruption and check other > combinations of in-image and in-RAM bitmaps. > > Signed-off-by: Vladimir Sementsov-Ogievskiy > --- > block/qcow2-bitmap.c | 56 +++++++++++++++++++++++++++++--------------- > 1 file changed, 37 insertions(+), 19 deletions(-) > > diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c > index a636dc50ca..e276a95154 100644 > --- a/block/qcow2-bitmap.c > +++ b/block/qcow2-bitmap.c > @@ -1108,18 +1108,14 @@ int qcow2_reopen_bitmaps_rw(BlockDriverState *bs, Error **errp) > Qcow2BitmapList *bm_list; > Qcow2Bitmap *bm; > GSList *ro_dirty_bitmaps = NULL; > - int ret = 0; > + int ret = -EINVAL; > + bool need_header_update = false; > > if (s->nb_bitmaps == 0) { > /* No bitmaps - nothing to do */ > return 0; > } > > - if (!can_write(bs)) { > - error_setg(errp, "Can't write to the image on reopening bitmaps rw"); > - return -EINVAL; > - } > - > bm_list = bitmap_list_load(bs, s->bitmap_directory_offset, > s->bitmap_directory_size, errp); > if (bm_list == NULL) { > @@ -1128,32 +1124,54 @@ int qcow2_reopen_bitmaps_rw(BlockDriverState *bs, Error **errp) > > QSIMPLEQ_FOREACH(bm, bm_list, entry) { > BdrvDirtyBitmap *bitmap = bdrv_find_dirty_bitmap(bs, bm->name); > - if (bitmap == NULL) { > - continue; > - } > > - if (!bdrv_dirty_bitmap_readonly(bitmap)) { > - error_setg(errp, "Bitmap %s was loaded prior to rw-reopen, but was " > - "not marked as readonly. This is a bug, something went " > - "wrong. All of the bitmaps may be corrupted", bm->name); > - ret = -EINVAL; > + if (!bitmap) { > + error_setg(errp, "Unexpected bitmap '%s' in the image '%s'", > + bm->name, bs->filename); > goto out; > } > I think you can actually drop the definite article, because the image name is the specifier. "Unexpected bitmap '%s' in image '%s'" is sufficient. > - bm->flags |= BME_FLAG_IN_USE; > - ro_dirty_bitmaps = g_slist_append(ro_dirty_bitmaps, bitmap); > + if (!(bm->flags & BME_FLAG_IN_USE)) { > + if (!bdrv_dirty_bitmap_readonly(bitmap)) { > + error_setg(errp, "Corruption: bitmap '%s' is not marked IN_USE " > + "in the image '%s' and not marked readonly in RAM", > + bm->name, bs->filename); > + goto out; > + } > + if (bdrv_dirty_bitmap_inconsistent(bitmap)) { > + error_setg(errp, "Corruption: bitmap '%s' is inconsistent but " > + "is not marked IN_USE in the image '%s'", bm->name, > + bs->filename); > + goto out; > + } We support RW --> RW now, but what happens if something is marked IN_USE on RO --> RW? It's not obvious from this function alone why that's safe to ignore. > + > + bm->flags |= BME_FLAG_IN_USE; > + need_header_update = true; > + } > + > + if (bdrv_dirty_bitmap_readonly(bitmap)) { > + ro_dirty_bitmaps = g_slist_append(ro_dirty_bitmaps, bitmap); > + } > } > > - if (ro_dirty_bitmaps != NULL) { > + if (need_header_update) { > + if (!can_write(bs->file->bs) || !(bs->file->perm & BLK_PERM_WRITE)) { > + error_setg(errp, "Failed to reopen bitmaps rw: no write access " > + "the protocol file"); > + goto out; > + } > + > /* in_use flags must be updated */ > ret = update_ext_header_and_dir_in_place(bs, bm_list); > if (ret < 0) { > - error_setg_errno(errp, -ret, "Can't update bitmap directory"); > + error_setg_errno(errp, -ret, "Cannot update bitmap directory"); > goto out; > } > - g_slist_foreach(ro_dirty_bitmaps, set_readonly_helper, false); > } > > + g_slist_foreach(ro_dirty_bitmaps, set_readonly_helper, false); > + ret = 0; > + > out: > g_slist_free(ro_dirty_bitmaps); > bitmap_list_free(bm_list); > Seems OK otherwise, but I just have that one doubt.