| Message ID | 20211012120445.861860-4-hch@lst.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [1/7] block: add a ->get_unique_id method | expand |
On Tue, Oct 12, 2021 at 02:04:41PM +0200, Christoph Hellwig wrote: > Call the ->get_unique_id method to query the SCSI identifiers. This can > use the cached VPD page in the sd driver instead of sending a command > on every LAYOUTGET. It will also allow to support NVMe based volumes > if the draft for that ever takes off. Acked-by: J. Bruce Fields <bfields@redhat.com> (But I'm not really in a position to review scsi layout code, so this is more just an acknowledgement that you're the expert.) --b. > > Signed-off-by: Christoph Hellwig <hch@lst.de> > --- > fs/nfsd/Kconfig | 1 - > fs/nfsd/blocklayout.c | 158 +++++++++++------------------------------- > fs/nfsd/nfs4layouts.c | 5 +- > 3 files changed, 44 insertions(+), 120 deletions(-) > > diff --git a/fs/nfsd/Kconfig b/fs/nfsd/Kconfig > index 6e9ea4ee0f737..3d1d17256a91c 100644 > --- a/fs/nfsd/Kconfig > +++ b/fs/nfsd/Kconfig > @@ -109,7 +109,6 @@ config NFSD_SCSILAYOUT > depends on NFSD_V4 && BLOCK > select NFSD_PNFS > select EXPORTFS_BLOCK_OPS > - select SCSI_COMMON > help > This option enables support for the exporting pNFS SCSI layouts > in the kernel's NFS server. The pNFS SCSI layout enables NFS > diff --git a/fs/nfsd/blocklayout.c b/fs/nfsd/blocklayout.c > index c99dee99a3c15..e5c0982a381de 100644 > --- a/fs/nfsd/blocklayout.c > +++ b/fs/nfsd/blocklayout.c > @@ -9,9 +9,6 @@ > #include <linux/pr.h> > > #include <linux/nfsd/debug.h> > -#include <scsi/scsi_proto.h> > -#include <scsi/scsi_common.h> > -#include <scsi/scsi_request.h> > > #include "blocklayoutxdr.h" > #include "pnfs.h" > @@ -211,109 +208,6 @@ const struct nfsd4_layout_ops bl_layout_ops = { > #endif /* CONFIG_NFSD_BLOCKLAYOUT */ > > #ifdef CONFIG_NFSD_SCSILAYOUT > -static int nfsd4_scsi_identify_device(struct block_device *bdev, > - struct pnfs_block_volume *b) > -{ > - struct request_queue *q = bdev->bd_disk->queue; > - struct request *rq; > - struct scsi_request *req; > - /* > - * The allocation length (passed in bytes 3 and 4 of the INQUIRY > - * command descriptor block) specifies the number of bytes that have > - * been allocated for the data-in buffer. > - * 252 is the highest one-byte value that is a multiple of 4. > - * 65532 is the highest two-byte value that is a multiple of 4. > - */ > - size_t bufflen = 252, maxlen = 65532, len, id_len; > - u8 *buf, *d, type, assoc; > - int retries = 1, error; > - > - if (WARN_ON_ONCE(!blk_queue_scsi_passthrough(q))) > - return -EINVAL; > - > -again: > - buf = kzalloc(bufflen, GFP_KERNEL); > - if (!buf) > - return -ENOMEM; > - > - rq = blk_get_request(q, REQ_OP_DRV_IN, 0); > - if (IS_ERR(rq)) { > - error = -ENOMEM; > - goto out_free_buf; > - } > - req = scsi_req(rq); > - > - error = blk_rq_map_kern(q, rq, buf, bufflen, GFP_KERNEL); > - if (error) > - goto out_put_request; > - > - req->cmd[0] = INQUIRY; > - req->cmd[1] = 1; > - req->cmd[2] = 0x83; > - req->cmd[3] = bufflen >> 8; > - req->cmd[4] = bufflen & 0xff; > - req->cmd_len = COMMAND_SIZE(INQUIRY); > - > - blk_execute_rq(NULL, rq, 1); > - if (req->result) { > - pr_err("pNFS: INQUIRY 0x83 failed with: %x\n", > - req->result); > - error = -EIO; > - goto out_put_request; > - } > - > - len = (buf[2] << 8) + buf[3] + 4; > - if (len > bufflen) { > - if (len <= maxlen && retries--) { > - blk_put_request(rq); > - kfree(buf); > - bufflen = len; > - goto again; > - } > - pr_err("pNFS: INQUIRY 0x83 response invalid (len = %zd)\n", > - len); > - goto out_put_request; > - } > - > - d = buf + 4; > - for (d = buf + 4; d < buf + len; d += id_len + 4) { > - id_len = d[3]; > - type = d[1] & 0xf; > - assoc = (d[1] >> 4) & 0x3; > - > - /* > - * We only care about a EUI-64 and NAA designator types > - * with LU association. > - */ > - if (assoc != 0x00) > - continue; > - if (type != 0x02 && type != 0x03) > - continue; > - if (id_len != 8 && id_len != 12 && id_len != 16) > - continue; > - > - b->scsi.code_set = PS_CODE_SET_BINARY; > - b->scsi.designator_type = type == 0x02 ? > - PS_DESIGNATOR_EUI64 : PS_DESIGNATOR_NAA; > - b->scsi.designator_len = id_len; > - memcpy(b->scsi.designator, d + 4, id_len); > - > - /* > - * If we found a 8 or 12 byte descriptor continue on to > - * see if a 16 byte one is available. If we find a > - * 16 byte descriptor we're done. > - */ > - if (id_len == 16) > - break; > - } > - > -out_put_request: > - blk_put_request(rq); > -out_free_buf: > - kfree(buf); > - return error; > -} > - > #define NFSD_MDS_PR_KEY 0x0100000000000000ULL > > /* > @@ -325,6 +219,31 @@ static u64 nfsd4_scsi_pr_key(struct nfs4_client *clp) > return ((u64)clp->cl_clientid.cl_boot << 32) | clp->cl_clientid.cl_id; > } > > +static const u8 designator_types[] = { > + PS_DESIGNATOR_EUI64, > + PS_DESIGNATOR_NAA, > +}; > + > +static int > +nfsd4_block_get_unique_id(struct gendisk *disk, struct pnfs_block_volume *b) > +{ > + int ret, i; > + > + for (i = 0; i < ARRAY_SIZE(designator_types); i++) { > + u8 type = designator_types[i]; > + > + ret = disk->fops->get_unique_id(disk, b->scsi.designator, type); > + if (ret > 0) { > + b->scsi.code_set = PS_CODE_SET_BINARY; > + b->scsi.designator_type = type; > + b->scsi.designator_len = ret; > + return 0; > + } > + } > + > + return -EINVAL; > +} > + > static int > nfsd4_block_get_device_info_scsi(struct super_block *sb, > struct nfs4_client *clp, > @@ -333,7 +252,7 @@ nfsd4_block_get_device_info_scsi(struct super_block *sb, > struct pnfs_block_deviceaddr *dev; > struct pnfs_block_volume *b; > const struct pr_ops *ops; > - int error; > + int ret; > > dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) + > sizeof(struct pnfs_block_volume), GFP_KERNEL); > @@ -347,33 +266,38 @@ nfsd4_block_get_device_info_scsi(struct super_block *sb, > b->type = PNFS_BLOCK_VOLUME_SCSI; > b->scsi.pr_key = nfsd4_scsi_pr_key(clp); > > - error = nfsd4_scsi_identify_device(sb->s_bdev, b); > - if (error) > - return error; > + ret = nfsd4_block_get_unique_id(sb->s_bdev->bd_disk, b); > + if (ret < 0) > + goto out_free_dev; > > + ret = -EINVAL; > ops = sb->s_bdev->bd_disk->fops->pr_ops; > if (!ops) { > pr_err("pNFS: device %s does not support PRs.\n", > sb->s_id); > - return -EINVAL; > + goto out_free_dev; > } > > - error = ops->pr_register(sb->s_bdev, 0, NFSD_MDS_PR_KEY, true); > - if (error) { > + ret = ops->pr_register(sb->s_bdev, 0, NFSD_MDS_PR_KEY, true); > + if (ret) { > pr_err("pNFS: failed to register key for device %s.\n", > sb->s_id); > - return -EINVAL; > + goto out_free_dev; > } > > - error = ops->pr_reserve(sb->s_bdev, NFSD_MDS_PR_KEY, > + ret = ops->pr_reserve(sb->s_bdev, NFSD_MDS_PR_KEY, > PR_EXCLUSIVE_ACCESS_REG_ONLY, 0); > - if (error) { > + if (ret) { > pr_err("pNFS: failed to reserve device %s.\n", > sb->s_id); > - return -EINVAL; > + goto out_free_dev; > } > > return 0; > + > +out_free_dev: > + kfree(dev); > + return ret; > } > > static __be32 > diff --git a/fs/nfsd/nfs4layouts.c b/fs/nfsd/nfs4layouts.c > index a97873f2d22b0..6d1b5bb051c56 100644 > --- a/fs/nfsd/nfs4layouts.c > +++ b/fs/nfsd/nfs4layouts.c > @@ -145,8 +145,9 @@ void nfsd4_setup_layout_type(struct svc_export *exp) > #ifdef CONFIG_NFSD_SCSILAYOUT > if (sb->s_export_op->map_blocks && > sb->s_export_op->commit_blocks && > - sb->s_bdev && sb->s_bdev->bd_disk->fops->pr_ops && > - blk_queue_scsi_passthrough(sb->s_bdev->bd_disk->queue)) > + sb->s_bdev && > + sb->s_bdev->bd_disk->fops->pr_ops && > + sb->s_bdev->bd_disk->fops->get_unique_id) > exp->ex_layout_types |= 1 << LAYOUT_SCSI; > #endif > } > -- > 2.30.2
On 10/12/21 2:04 PM, Christoph Hellwig wrote: > Call the ->get_unique_id method to query the SCSI identifiers. This can > use the cached VPD page in the sd driver instead of sending a command > on every LAYOUTGET. It will also allow to support NVMe based volumes > if the draft for that ever takes off. > > Signed-off-by: Christoph Hellwig <hch@lst.de> > --- > fs/nfsd/Kconfig | 1 - > fs/nfsd/blocklayout.c | 158 +++++++++++------------------------------- > fs/nfsd/nfs4layouts.c | 5 +- > 3 files changed, 44 insertions(+), 120 deletions(-) > Not that I'm an NFS expert, but anyway: Reviewed-by: Hannes Reinecke <hare@suse.de> Cheers, Hannes
diff --git a/fs/nfsd/Kconfig b/fs/nfsd/Kconfig index 6e9ea4ee0f737..3d1d17256a91c 100644 --- a/fs/nfsd/Kconfig +++ b/fs/nfsd/Kconfig @@ -109,7 +109,6 @@ config NFSD_SCSILAYOUT depends on NFSD_V4 && BLOCK select NFSD_PNFS select EXPORTFS_BLOCK_OPS - select SCSI_COMMON help This option enables support for the exporting pNFS SCSI layouts in the kernel's NFS server. The pNFS SCSI layout enables NFS diff --git a/fs/nfsd/blocklayout.c b/fs/nfsd/blocklayout.c index c99dee99a3c15..e5c0982a381de 100644 --- a/fs/nfsd/blocklayout.c +++ b/fs/nfsd/blocklayout.c @@ -9,9 +9,6 @@ #include <linux/pr.h> #include <linux/nfsd/debug.h> -#include <scsi/scsi_proto.h> -#include <scsi/scsi_common.h> -#include <scsi/scsi_request.h> #include "blocklayoutxdr.h" #include "pnfs.h" @@ -211,109 +208,6 @@ const struct nfsd4_layout_ops bl_layout_ops = { #endif /* CONFIG_NFSD_BLOCKLAYOUT */ #ifdef CONFIG_NFSD_SCSILAYOUT -static int nfsd4_scsi_identify_device(struct block_device *bdev, - struct pnfs_block_volume *b) -{ - struct request_queue *q = bdev->bd_disk->queue; - struct request *rq; - struct scsi_request *req; - /* - * The allocation length (passed in bytes 3 and 4 of the INQUIRY - * command descriptor block) specifies the number of bytes that have - * been allocated for the data-in buffer. - * 252 is the highest one-byte value that is a multiple of 4. - * 65532 is the highest two-byte value that is a multiple of 4. - */ - size_t bufflen = 252, maxlen = 65532, len, id_len; - u8 *buf, *d, type, assoc; - int retries = 1, error; - - if (WARN_ON_ONCE(!blk_queue_scsi_passthrough(q))) - return -EINVAL; - -again: - buf = kzalloc(bufflen, GFP_KERNEL); - if (!buf) - return -ENOMEM; - - rq = blk_get_request(q, REQ_OP_DRV_IN, 0); - if (IS_ERR(rq)) { - error = -ENOMEM; - goto out_free_buf; - } - req = scsi_req(rq); - - error = blk_rq_map_kern(q, rq, buf, bufflen, GFP_KERNEL); - if (error) - goto out_put_request; - - req->cmd[0] = INQUIRY; - req->cmd[1] = 1; - req->cmd[2] = 0x83; - req->cmd[3] = bufflen >> 8; - req->cmd[4] = bufflen & 0xff; - req->cmd_len = COMMAND_SIZE(INQUIRY); - - blk_execute_rq(NULL, rq, 1); - if (req->result) { - pr_err("pNFS: INQUIRY 0x83 failed with: %x\n", - req->result); - error = -EIO; - goto out_put_request; - } - - len = (buf[2] << 8) + buf[3] + 4; - if (len > bufflen) { - if (len <= maxlen && retries--) { - blk_put_request(rq); - kfree(buf); - bufflen = len; - goto again; - } - pr_err("pNFS: INQUIRY 0x83 response invalid (len = %zd)\n", - len); - goto out_put_request; - } - - d = buf + 4; - for (d = buf + 4; d < buf + len; d += id_len + 4) { - id_len = d[3]; - type = d[1] & 0xf; - assoc = (d[1] >> 4) & 0x3; - - /* - * We only care about a EUI-64 and NAA designator types - * with LU association. - */ - if (assoc != 0x00) - continue; - if (type != 0x02 && type != 0x03) - continue; - if (id_len != 8 && id_len != 12 && id_len != 16) - continue; - - b->scsi.code_set = PS_CODE_SET_BINARY; - b->scsi.designator_type = type == 0x02 ? - PS_DESIGNATOR_EUI64 : PS_DESIGNATOR_NAA; - b->scsi.designator_len = id_len; - memcpy(b->scsi.designator, d + 4, id_len); - - /* - * If we found a 8 or 12 byte descriptor continue on to - * see if a 16 byte one is available. If we find a - * 16 byte descriptor we're done. - */ - if (id_len == 16) - break; - } - -out_put_request: - blk_put_request(rq); -out_free_buf: - kfree(buf); - return error; -} - #define NFSD_MDS_PR_KEY 0x0100000000000000ULL /* @@ -325,6 +219,31 @@ static u64 nfsd4_scsi_pr_key(struct nfs4_client *clp) return ((u64)clp->cl_clientid.cl_boot << 32) | clp->cl_clientid.cl_id; } +static const u8 designator_types[] = { + PS_DESIGNATOR_EUI64, + PS_DESIGNATOR_NAA, +}; + +static int +nfsd4_block_get_unique_id(struct gendisk *disk, struct pnfs_block_volume *b) +{ + int ret, i; + + for (i = 0; i < ARRAY_SIZE(designator_types); i++) { + u8 type = designator_types[i]; + + ret = disk->fops->get_unique_id(disk, b->scsi.designator, type); + if (ret > 0) { + b->scsi.code_set = PS_CODE_SET_BINARY; + b->scsi.designator_type = type; + b->scsi.designator_len = ret; + return 0; + } + } + + return -EINVAL; +} + static int nfsd4_block_get_device_info_scsi(struct super_block *sb, struct nfs4_client *clp, @@ -333,7 +252,7 @@ nfsd4_block_get_device_info_scsi(struct super_block *sb, struct pnfs_block_deviceaddr *dev; struct pnfs_block_volume *b; const struct pr_ops *ops; - int error; + int ret; dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) + sizeof(struct pnfs_block_volume), GFP_KERNEL); @@ -347,33 +266,38 @@ nfsd4_block_get_device_info_scsi(struct super_block *sb, b->type = PNFS_BLOCK_VOLUME_SCSI; b->scsi.pr_key = nfsd4_scsi_pr_key(clp); - error = nfsd4_scsi_identify_device(sb->s_bdev, b); - if (error) - return error; + ret = nfsd4_block_get_unique_id(sb->s_bdev->bd_disk, b); + if (ret < 0) + goto out_free_dev; + ret = -EINVAL; ops = sb->s_bdev->bd_disk->fops->pr_ops; if (!ops) { pr_err("pNFS: device %s does not support PRs.\n", sb->s_id); - return -EINVAL; + goto out_free_dev; } - error = ops->pr_register(sb->s_bdev, 0, NFSD_MDS_PR_KEY, true); - if (error) { + ret = ops->pr_register(sb->s_bdev, 0, NFSD_MDS_PR_KEY, true); + if (ret) { pr_err("pNFS: failed to register key for device %s.\n", sb->s_id); - return -EINVAL; + goto out_free_dev; } - error = ops->pr_reserve(sb->s_bdev, NFSD_MDS_PR_KEY, + ret = ops->pr_reserve(sb->s_bdev, NFSD_MDS_PR_KEY, PR_EXCLUSIVE_ACCESS_REG_ONLY, 0); - if (error) { + if (ret) { pr_err("pNFS: failed to reserve device %s.\n", sb->s_id); - return -EINVAL; + goto out_free_dev; } return 0; + +out_free_dev: + kfree(dev); + return ret; } static __be32 diff --git a/fs/nfsd/nfs4layouts.c b/fs/nfsd/nfs4layouts.c index a97873f2d22b0..6d1b5bb051c56 100644 --- a/fs/nfsd/nfs4layouts.c +++ b/fs/nfsd/nfs4layouts.c @@ -145,8 +145,9 @@ void nfsd4_setup_layout_type(struct svc_export *exp) #ifdef CONFIG_NFSD_SCSILAYOUT if (sb->s_export_op->map_blocks && sb->s_export_op->commit_blocks && - sb->s_bdev && sb->s_bdev->bd_disk->fops->pr_ops && - blk_queue_scsi_passthrough(sb->s_bdev->bd_disk->queue)) + sb->s_bdev && + sb->s_bdev->bd_disk->fops->pr_ops && + sb->s_bdev->bd_disk->fops->get_unique_id) exp->ex_layout_types |= 1 << LAYOUT_SCSI; #endif }
Call the ->get_unique_id method to query the SCSI identifiers. This can use the cached VPD page in the sd driver instead of sending a command on every LAYOUTGET. It will also allow to support NVMe based volumes if the draft for that ever takes off. Signed-off-by: Christoph Hellwig <hch@lst.de> --- fs/nfsd/Kconfig | 1 - fs/nfsd/blocklayout.c | 158 +++++++++++------------------------------- fs/nfsd/nfs4layouts.c | 5 +- 3 files changed, 44 insertions(+), 120 deletions(-)