| Message ID | 20220826162131.8352-1-faithilikerun@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v8,1/7] include: add zoned device structs | expand |
Sam Li <faithilikerun@gmail.com> 于2022年8月27日周六 00:21写道： > > Putting zoned/non-zoned BlockDrivers on top of each other is not > allowed. > > Signed-off-by: Sam Li <faithilikerun@gmail.com> > Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> > --- > block.c | 14 ++++++++++++++ > block/file-posix.c | 13 +++++++++++++ > block/raw-format.c | 1 + > include/block/block_int-common.h | 5 +++++ > 4 files changed, 33 insertions(+) > > diff --git a/block.c b/block.c > index bc85f46eed..dad2ed3959 100644 > --- a/block.c > +++ b/block.c > @@ -7947,6 +7947,20 @@ void bdrv_add_child(BlockDriverState *parent_bs, BlockDriverState *child_bs, > return; > } > > + /* > + * Non-zoned block drivers do not follow zoned storage constraints > + * (i.e. sequential writes to zones). Refuse mixing zoned and non-zoned > + * drivers in a graph. > + */ > + if (!parent_bs->drv->supports_zoned_children && > + child_bs->bl.zoned == BLK_Z_HM) { > + error_setg(errp, "Cannot add a %s child to a %s parent", > + child_bs->bl.zoned == BLK_Z_HM ? "zoned" : "non-zoned", > + parent_bs->drv->supports_zoned_children ? > + "support zoned children" : "not support zoned children"); > + return; > + } > + > if (!QLIST_EMPTY(&child_bs->parents)) { > error_setg(errp, "The node %s already has a parent", > child_bs->node_name); > diff --git a/block/file-posix.c b/block/file-posix.c > index e3efba6db7..ec8672d33c 100644 > --- a/block/file-posix.c > +++ b/block/file-posix.c > @@ -777,6 +777,19 @@ static int raw_open_common(BlockDriverState *bs, QDict *options, > goto fail; > } > } > +#ifdef CONFIG_BLKZONED > + /* > + * The kernel page chache does not reliably work for writes to SWR zones > + * of zoned block device because it can not guarantee the order of writes. > + */ > + Apology. Should add the device constraint condition line: + if (strcmp(bs->drv->format_name, "zoned_host_device") == 0) { > + if (!(s->open_flags & O_DIRECT)) { > + error_setg(errp, "driver=zoned_host_device was specified, but it " > + "requires cache.direct=on, which was not specified."); > + ret = -EINVAL; > + return ret; /* No host kernel page cache */ > + } + } > +#endif > > if (S_ISBLK(st.st_mode)) { > #ifdef BLKDISCARDZEROES > diff --git a/block/raw-format.c b/block/raw-format.c > index 6b20bd22ef..9441536819 100644 > --- a/block/raw-format.c > +++ b/block/raw-format.c > @@ -614,6 +614,7 @@ static void raw_child_perm(BlockDriverState *bs, BdrvChild *c, > BlockDriver bdrv_raw = { > .format_name = "raw", > .instance_size = sizeof(BDRVRawState), > + .supports_zoned_children = true, > .bdrv_probe = &raw_probe, > .bdrv_reopen_prepare = &raw_reopen_prepare, > .bdrv_reopen_commit = &raw_reopen_commit, > diff --git a/include/block/block_int-common.h b/include/block/block_int-common.h > index 8541f36123..1bb5caa3be 100644 > --- a/include/block/block_int-common.h > +++ b/include/block/block_int-common.h > @@ -127,6 +127,11 @@ struct BlockDriver { > */ > bool is_format; > > + /* > + * Set to true if the BlockDriver supports zoned children. > + */ > + bool supports_zoned_children; > + > /* > * Drivers not implementing bdrv_parse_filename nor bdrv_open should have > * this field set to true, except ones that are defined only by their > -- > 2.37.2 >
diff --git a/block.c b/block.c index bc85f46eed..dad2ed3959 100644 --- a/block.c +++ b/block.c @@ -7947,6 +7947,20 @@ void bdrv_add_child(BlockDriverState *parent_bs, BlockDriverState *child_bs, return; } + /* + * Non-zoned block drivers do not follow zoned storage constraints + * (i.e. sequential writes to zones). Refuse mixing zoned and non-zoned + * drivers in a graph. + */ + if (!parent_bs->drv->supports_zoned_children && + child_bs->bl.zoned == BLK_Z_HM) { + error_setg(errp, "Cannot add a %s child to a %s parent", + child_bs->bl.zoned == BLK_Z_HM ? "zoned" : "non-zoned", + parent_bs->drv->supports_zoned_children ? + "support zoned children" : "not support zoned children"); + return; + } + if (!QLIST_EMPTY(&child_bs->parents)) { error_setg(errp, "The node %s already has a parent", child_bs->node_name); diff --git a/block/file-posix.c b/block/file-posix.c index e3efba6db7..ec8672d33c 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -777,6 +777,19 @@ static int raw_open_common(BlockDriverState *bs, QDict *options, goto fail; } } +#ifdef CONFIG_BLKZONED + /* + * The kernel page chache does not reliably work for writes to SWR zones + * of zoned block device because it can not guarantee the order of writes. + */ + + if (!(s->open_flags & O_DIRECT)) { + error_setg(errp, "driver=zoned_host_device was specified, but it " + "requires cache.direct=on, which was not specified."); + ret = -EINVAL; + return ret; /* No host kernel page cache */ + } +#endif if (S_ISBLK(st.st_mode)) { #ifdef BLKDISCARDZEROES diff --git a/block/raw-format.c b/block/raw-format.c index 6b20bd22ef..9441536819 100644 --- a/block/raw-format.c +++ b/block/raw-format.c @@ -614,6 +614,7 @@ static void raw_child_perm(BlockDriverState *bs, BdrvChild *c, BlockDriver bdrv_raw = { .format_name = "raw", .instance_size = sizeof(BDRVRawState), + .supports_zoned_children = true, .bdrv_probe = &raw_probe, .bdrv_reopen_prepare = &raw_reopen_prepare, .bdrv_reopen_commit = &raw_reopen_commit, diff --git a/include/block/block_int-common.h b/include/block/block_int-common.h index 8541f36123..1bb5caa3be 100644 --- a/include/block/block_int-common.h +++ b/include/block/block_int-common.h @@ -127,6 +127,11 @@ struct BlockDriver { */ bool is_format; + /* + * Set to true if the BlockDriver supports zoned children. + */ + bool supports_zoned_children; + /* * Drivers not implementing bdrv_parse_filename nor bdrv_open should have * this field set to true, except ones that are defined only by their