| Message ID | 20240611051929.513387-3-hch@lst.de (mailing list archive) |
|---|---|
| State | Handled Elsewhere, archived |
| Headers | show |
| Series | [01/26] sd: fix sd_is_zoned | expand |
On 6/11/24 2:19 PM, Christoph Hellwig wrote: > Move a bit of code that sets up the zone flag and the write granularity > into sd_zbc_read_zones to be with the rest of the zoned limits. > > Signed-off-by: Christoph Hellwig <hch@lst.de> > --- > drivers/scsi/sd.c | 21 +-------------------- > drivers/scsi/sd_zbc.c | 13 ++++++++++++- > 2 files changed, 13 insertions(+), 21 deletions(-) > > diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c > index 85b45345a27739..5bfed61c70db8f 100644 > --- a/drivers/scsi/sd.c > +++ b/drivers/scsi/sd.c > @@ -3308,29 +3308,10 @@ static void sd_read_block_characteristics(struct scsi_disk *sdkp, > blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q); > } > > - > -#ifdef CONFIG_BLK_DEV_ZONED /* sd_probe rejects ZBD devices early otherwise */ > - if (sdkp->device->type == TYPE_ZBC) { > - lim->zoned = true; > - > - /* > - * Per ZBC and ZAC specifications, writes in sequential write > - * required zones of host-managed devices must be aligned to > - * the device physical block size. > - */ > - lim->zone_write_granularity = sdkp->physical_block_size; > - } else { > - /* > - * Host-aware devices are treated as conventional. > - */ > - lim->zoned = false; > - } > -#endif /* CONFIG_BLK_DEV_ZONED */ > - > if (!sdkp->first_scan) > return; > > - if (lim->zoned) > + if (sdkp->device->type == TYPE_ZBC) Nit: use sd_is_zoned() here ? > sd_printk(KERN_NOTICE, sdkp, "Host-managed zoned block device\n"); > else if (sdkp->zoned == 1) > sd_printk(KERN_NOTICE, sdkp, "Host-aware SMR disk used as regular disk\n"); > diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c > index 422eaed8457227..e9501db0450be3 100644 > --- a/drivers/scsi/sd_zbc.c > +++ b/drivers/scsi/sd_zbc.c > @@ -598,8 +598,19 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp, struct queue_limits *lim, > u32 zone_blocks = 0; > int ret; > > - if (!sd_is_zoned(sdkp)) > + if (!sd_is_zoned(sdkp)) { > + lim->zoned = false; Maybe we should clear the other zone related limits here ? If the drive is reformatted/converted from SMR to CMR (FORMAT WITH PRESET), the other zone limits may be set already, no ? > return 0; > + } > + > + lim->zoned = true; > + > + /* > + * Per ZBC and ZAC specifications, writes in sequential write required > + * zones of host-managed devices must be aligned to the device physical > + * block size. > + */ > + lim->zone_write_granularity = sdkp->physical_block_size; > > /* READ16/WRITE16/SYNC16 is mandatory for ZBC devices */ > sdkp->device->use_16_for_rw = 1;
On Tue, Jun 11, 2024 at 02:51:24PM +0900, Damien Le Moal wrote: > > - if (lim->zoned) > > + if (sdkp->device->type == TYPE_ZBC) > > Nit: use sd_is_zoned() here ? Yes. > > - if (!sd_is_zoned(sdkp)) > > + if (!sd_is_zoned(sdkp)) { > > + lim->zoned = false; > > Maybe we should clear the other zone related limits here ? If the drive is > reformatted/converted from SMR to CMR (FORMAT WITH PRESET), the other zone > limits may be set already, no ? blk_validate_zoned_limits already takes care of that.
On Tue, Jun 11, 2024 at 07:52:39AM +0200, Christoph Hellwig wrote: > > Maybe we should clear the other zone related limits here ? If the drive is > > reformatted/converted from SMR to CMR (FORMAT WITH PRESET), the other zone > > limits may be set already, no ? > > blk_validate_zoned_limits already takes care of that. Sorry, brainfart. The integrity code does that, but not the zoned code. I suspect the core code might be a better place for it, though.
On 6/11/24 2:52 PM, Christoph Hellwig wrote: > On Tue, Jun 11, 2024 at 02:51:24PM +0900, Damien Le Moal wrote: >>> - if (lim->zoned) >>> + if (sdkp->device->type == TYPE_ZBC) >> >> Nit: use sd_is_zoned() here ? > > Yes. > >>> - if (!sd_is_zoned(sdkp)) >>> + if (!sd_is_zoned(sdkp)) { >>> + lim->zoned = false; >> >> Maybe we should clear the other zone related limits here ? If the drive is >> reformatted/converted from SMR to CMR (FORMAT WITH PRESET), the other zone >> limits may be set already, no ? > > blk_validate_zoned_limits already takes care of that. I do not think it does: static int blk_validate_zoned_limits(struct queue_limits *lim) { if (!lim->zoned) { if (WARN_ON_ONCE(lim->max_open_zones) || WARN_ON_ONCE(lim->max_active_zones) || WARN_ON_ONCE(lim->zone_write_granularity) || WARN_ON_ONCE(lim->max_zone_append_sectors)) return -EINVAL; return 0; } ... So setting lim->zoned to false without clearing the other limits potentially will trigger warnings...
On 6/11/24 2:54 PM, Christoph Hellwig wrote: > On Tue, Jun 11, 2024 at 07:52:39AM +0200, Christoph Hellwig wrote: >>> Maybe we should clear the other zone related limits here ? If the drive is >>> reformatted/converted from SMR to CMR (FORMAT WITH PRESET), the other zone >>> limits may be set already, no ? >> >> blk_validate_zoned_limits already takes care of that. > > Sorry, brainfart. The integrity code does that, but not the zoned > code. I suspect the core code might be a better place for it, > though. Yes. Just replied to your previous email before seeing this one. I think that: static int blk_validate_zoned_limits(struct queue_limits *lim) { if (!lim->zoned) { if (WARN_ON_ONCE(lim->max_open_zones) || WARN_ON_ONCE(lim->max_active_zones) || WARN_ON_ONCE(lim->zone_write_granularity) || WARN_ON_ONCE(lim->max_zone_append_sectors)) return -EINVAL; return 0; } ... could be changed into: static int blk_validate_zoned_limits(struct queue_limits *lim) { if (!lim->zoned) { lim->max_open_zones = 0; lim->max_active_zones = 0; lim->zone_write_granularity = 0; lim->max_zone_append_sectors = 0 return 0; } But then we would not see "bad" drivers. Could have a small blk_clear_zoned_limits(struct queue_limits *lim) helper too.
On 6/11/24 07:19, Christoph Hellwig wrote: > Move a bit of code that sets up the zone flag and the write granularity > into sd_zbc_read_zones to be with the rest of the zoned limits. > > Signed-off-by: Christoph Hellwig <hch@lst.de> > --- > drivers/scsi/sd.c | 21 +-------------------- > drivers/scsi/sd_zbc.c | 13 ++++++++++++- > 2 files changed, 13 insertions(+), 21 deletions(-) > > diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c > index 85b45345a27739..5bfed61c70db8f 100644 > --- a/drivers/scsi/sd.c > +++ b/drivers/scsi/sd.c > @@ -3308,29 +3308,10 @@ static void sd_read_block_characteristics(struct scsi_disk *sdkp, > blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q); > } > > - > -#ifdef CONFIG_BLK_DEV_ZONED /* sd_probe rejects ZBD devices early otherwise */ > - if (sdkp->device->type == TYPE_ZBC) { > - lim->zoned = true; > - > - /* > - * Per ZBC and ZAC specifications, writes in sequential write > - * required zones of host-managed devices must be aligned to > - * the device physical block size. > - */ > - lim->zone_write_granularity = sdkp->physical_block_size; > - } else { > - /* > - * Host-aware devices are treated as conventional. > - */ > - lim->zoned = false; > - } > -#endif /* CONFIG_BLK_DEV_ZONED */ > - > if (!sdkp->first_scan) > return; > > - if (lim->zoned) > + if (sdkp->device->type == TYPE_ZBC) Why not sd_is_zoned()? Cheers, Hannes
On Tue, Jun 11, 2024 at 02:51:24PM +0900, Damien Le Moal wrote: > > - if (!sd_is_zoned(sdkp)) > > + if (!sd_is_zoned(sdkp)) { > > + lim->zoned = false; > > Maybe we should clear the other zone related limits here ? If the drive is > reformatted/converted from SMR to CMR (FORMAT WITH PRESET), the other zone > limits may be set already, no ? Yes, but we would not end up here. The device type is constant over the struct of the scsi_device and we'd have to fully reprobe it. So we don't need to clear any flags, including the actual zoned flag here.
On Tue, Jun 11, 2024 at 02:51:24PM +0900, Damien Le Moal wrote: > > + if (sdkp->device->type == TYPE_ZBC) > > Nit: use sd_is_zoned() here ? Actually - is there much in even keeping sd_is_zoned now that the host aware support is removed? Just open coding the type check isn't any more code, and probably easier to follow.
On 6/13/24 18:39, Christoph Hellwig wrote: > On Tue, Jun 11, 2024 at 02:51:24PM +0900, Damien Le Moal wrote: >>> + if (sdkp->device->type == TYPE_ZBC) >> >> Nit: use sd_is_zoned() here ? > > Actually - is there much in even keeping sd_is_zoned now that the > host aware support is removed? Just open coding the type check isn't > any more code, and probably easier to follow. Removing this helper is fine by me. There are only 2 call sites in sd.c and the some of 4 calls in sd_zbc.c are not really needed: 1) The call in sd_zbc_print_zones() is not needed at all since this function is called only for a zoned drive from sd_zbc_revalidate_zones(). 2) The calls in sd_zbc_report_zones() and sd_zbc_cmnd_checks() are probably useless as these are called only for zoned drives in the first place. The checks would be useful only for passthrough commands, but then we do not really care about these and the user will get a failure anyway if it tries to do ZBC commands on non-ZBC drives. 3) That leaves only the call in sd_zbc_read_zones() but that check can probably be moved to sd.c to conditionally call sd_zbc_read_zones().
On Mon, Jun 17, 2024 at 08:01:04AM +0900, Damien Le Moal wrote: > On 6/13/24 18:39, Christoph Hellwig wrote: > > On Tue, Jun 11, 2024 at 02:51:24PM +0900, Damien Le Moal wrote: > >>> + if (sdkp->device->type == TYPE_ZBC) > >> > >> Nit: use sd_is_zoned() here ? > > > > Actually - is there much in even keeping sd_is_zoned now that the > > host aware support is removed? Just open coding the type check isn't > > any more code, and probably easier to follow. > > Removing this helper is fine by me. FYI, I've removed it yesterday, but not done much of the cleanups suggest here. We should probably do those in a follow up up, uncluding removing the !ZBC check in sd_zbc_check_zoned_characteristics.
On 6/17/24 13:53, Christoph Hellwig wrote: > On Mon, Jun 17, 2024 at 08:01:04AM +0900, Damien Le Moal wrote: >> On 6/13/24 18:39, Christoph Hellwig wrote: >>> On Tue, Jun 11, 2024 at 02:51:24PM +0900, Damien Le Moal wrote: >>>>> + if (sdkp->device->type == TYPE_ZBC) >>>> >>>> Nit: use sd_is_zoned() here ? >>> >>> Actually - is there much in even keeping sd_is_zoned now that the >>> host aware support is removed? Just open coding the type check isn't >>> any more code, and probably easier to follow. >> >> Removing this helper is fine by me. > > FYI, I've removed it yesterday, but not done much of the cleanups suggest > here. We should probably do those in a follow up up, uncluding removing > the !ZBC check in sd_zbc_check_zoned_characteristics. OK. I will send that once your series in queued.
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 85b45345a27739..5bfed61c70db8f 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -3308,29 +3308,10 @@ static void sd_read_block_characteristics(struct scsi_disk *sdkp, blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q); } - -#ifdef CONFIG_BLK_DEV_ZONED /* sd_probe rejects ZBD devices early otherwise */ - if (sdkp->device->type == TYPE_ZBC) { - lim->zoned = true; - - /* - * Per ZBC and ZAC specifications, writes in sequential write - * required zones of host-managed devices must be aligned to - * the device physical block size. - */ - lim->zone_write_granularity = sdkp->physical_block_size; - } else { - /* - * Host-aware devices are treated as conventional. - */ - lim->zoned = false; - } -#endif /* CONFIG_BLK_DEV_ZONED */ - if (!sdkp->first_scan) return; - if (lim->zoned) + if (sdkp->device->type == TYPE_ZBC) sd_printk(KERN_NOTICE, sdkp, "Host-managed zoned block device\n"); else if (sdkp->zoned == 1) sd_printk(KERN_NOTICE, sdkp, "Host-aware SMR disk used as regular disk\n"); diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c index 422eaed8457227..e9501db0450be3 100644 --- a/drivers/scsi/sd_zbc.c +++ b/drivers/scsi/sd_zbc.c @@ -598,8 +598,19 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp, struct queue_limits *lim, u32 zone_blocks = 0; int ret; - if (!sd_is_zoned(sdkp)) + if (!sd_is_zoned(sdkp)) { + lim->zoned = false; return 0; + } + + lim->zoned = true; + + /* + * Per ZBC and ZAC specifications, writes in sequential write required + * zones of host-managed devices must be aligned to the device physical + * block size. + */ + lim->zone_write_granularity = sdkp->physical_block_size; /* READ16/WRITE16/SYNC16 is mandatory for ZBC devices */ sdkp->device->use_16_for_rw = 1;
Move a bit of code that sets up the zone flag and the write granularity into sd_zbc_read_zones to be with the rest of the zoned limits. Signed-off-by: Christoph Hellwig <hch@lst.de> --- drivers/scsi/sd.c | 21 +-------------------- drivers/scsi/sd_zbc.c | 13 ++++++++++++- 2 files changed, 13 insertions(+), 21 deletions(-)