| Message ID | 20221016145110.171262-6-faithilikerun@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add support for zoned device | expand |
On Sun, 2022-10-16 at 22:51 +0800, Sam Li wrote: > 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> > Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Dmitry Fomichev <dmitry.fomichev@wdc.com> > --- > block.c | 19 +++++++++++++++++++ > block/file-posix.c | 12 ++++++++++++ > block/raw-format.c | 1 + > include/block/block_int-common.h | 5 +++++ > 4 files changed, 37 insertions(+) > > diff --git a/block.c b/block.c > index 1fbf6b9e69..5d6fa4a25a 100644 > --- a/block.c > +++ b/block.c > @@ -7951,6 +7951,25 @@ 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) { > + /* > + * The host-aware model allows zoned storage constraints and random > + * write. Allow mixing host-aware and non-zoned drivers. Using > + * host-aware device as a regular device. > + */ > + 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 bd28e3eaea..7c5a330fc1 100644 > --- a/block/file-posix.c > +++ b/block/file-posix.c > @@ -776,6 +776,18 @@ static int raw_open_common(BlockDriverState *bs, QDict > *options, > goto fail; > } > } > +#ifdef CONFIG_BLKZONED > + /* > + * The kernel page cache does not reliably work for writes to SWR zones > + * of zoned block device because it can not guarantee the order of writes. > + */ > + if ((strcmp(bs->drv->format_name, "zoned_host_device") == 0) && > + (!(s->open_flags & O_DIRECT))) { > + error_setg(errp, "driver=zoned_host_device was specified, but it " > + "requires cache.direct=on, which was not specified."); > + return -EINVAL; /* No host kernel page cache */ > + } > +#endif > > if (S_ISBLK(st.st_mode)) { > #ifdef __linux__ > diff --git a/block/raw-format.c b/block/raw-format.c > index bac43f1d25..18dc52a150 100644 > --- a/block/raw-format.c > +++ b/block/raw-format.c > @@ -615,6 +615,7 @@ 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 cdc06e77a6..37dddc603c 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
diff --git a/block.c b/block.c index 1fbf6b9e69..5d6fa4a25a 100644 --- a/block.c +++ b/block.c @@ -7951,6 +7951,25 @@ 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) { + /* + * The host-aware model allows zoned storage constraints and random + * write. Allow mixing host-aware and non-zoned drivers. Using + * host-aware device as a regular device. + */ + 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 bd28e3eaea..7c5a330fc1 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -776,6 +776,18 @@ static int raw_open_common(BlockDriverState *bs, QDict *options, goto fail; } } +#ifdef CONFIG_BLKZONED + /* + * The kernel page cache does not reliably work for writes to SWR zones + * of zoned block device because it can not guarantee the order of writes. + */ + if ((strcmp(bs->drv->format_name, "zoned_host_device") == 0) && + (!(s->open_flags & O_DIRECT))) { + error_setg(errp, "driver=zoned_host_device was specified, but it " + "requires cache.direct=on, which was not specified."); + return -EINVAL; /* No host kernel page cache */ + } +#endif if (S_ISBLK(st.st_mode)) { #ifdef __linux__ diff --git a/block/raw-format.c b/block/raw-format.c index bac43f1d25..18dc52a150 100644 --- a/block/raw-format.c +++ b/block/raw-format.c @@ -615,6 +615,7 @@ 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 cdc06e77a6..37dddc603c 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