/*
- * Copyright (c) 2014 Christoph Hellwig.
+ * Copyright (c) 2014-2016 Christoph Hellwig.
*/
#include <linux/exportfs.h>
#include <linux/genhd.h>
#include <linux/slab.h>
+#include <linux/pr.h>
#include <linux/nfsd/debug.h>
+#include <scsi/scsi_proto.h>
+#include <scsi/scsi_common.h>
#include "blocklayoutxdr.h"
#include "pnfs.h"
#define NFSDDBG_FACILITY NFSDDBG_PNFS
-static int
-nfsd4_block_get_device_info_simple(struct super_block *sb,
- struct nfsd4_getdeviceinfo *gdp)
-{
- struct pnfs_block_deviceaddr *dev;
- struct pnfs_block_volume *b;
-
- dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) +
- sizeof(struct pnfs_block_volume), GFP_KERNEL);
- if (!dev)
- return -ENOMEM;
- gdp->gd_device = dev;
-
- dev->nr_volumes = 1;
- b = &dev->volumes[0];
-
- b->type = PNFS_BLOCK_VOLUME_SIMPLE;
- b->simple.sig_len = PNFS_BLOCK_UUID_LEN;
- return sb->s_export_op->get_uuid(sb, b->simple.sig, &b->simple.sig_len,
- &b->simple.offset);
-}
-
-static __be32
-nfsd4_block_proc_getdeviceinfo(struct super_block *sb,
- struct nfsd4_getdeviceinfo *gdp)
-{
- if (sb->s_bdev != sb->s_bdev->bd_contains)
- return nfserr_inval;
- return nfserrno(nfsd4_block_get_device_info_simple(sb, gdp));
-}
-
static __be32
nfsd4_block_proc_layoutget(struct inode *inode, const struct svc_fh *fhp,
struct nfsd4_layoutget *args)
}
static __be32
-nfsd4_block_proc_layoutcommit(struct inode *inode,
- struct nfsd4_layoutcommit *lcp)
+nfsd4_block_commit_blocks(struct inode *inode, struct nfsd4_layoutcommit *lcp,
+ struct iomap *iomaps, int nr_iomaps)
{
loff_t new_size = lcp->lc_last_wr + 1;
struct iattr iattr = { .ia_valid = 0 };
- struct iomap *iomaps;
- int nr_iomaps;
int error;
- nr_iomaps = nfsd4_block_decode_layoutupdate(lcp->lc_up_layout,
- lcp->lc_up_len, &iomaps, 1 << inode->i_blkbits);
- if (nr_iomaps < 0)
- return nfserrno(nr_iomaps);
-
if (lcp->lc_mtime.tv_nsec == UTIME_NOW ||
timespec_compare(&lcp->lc_mtime, &inode->i_mtime) < 0)
lcp->lc_mtime = current_fs_time(inode->i_sb);
return nfserrno(error);
}
+#ifdef CONFIG_NFSD_BLOCKLAYOUT
+static int
+nfsd4_block_get_device_info_simple(struct super_block *sb,
+ struct nfsd4_getdeviceinfo *gdp)
+{
+ struct pnfs_block_deviceaddr *dev;
+ struct pnfs_block_volume *b;
+
+ dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) +
+ sizeof(struct pnfs_block_volume), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+ gdp->gd_device = dev;
+
+ dev->nr_volumes = 1;
+ b = &dev->volumes[0];
+
+ b->type = PNFS_BLOCK_VOLUME_SIMPLE;
+ b->simple.sig_len = PNFS_BLOCK_UUID_LEN;
+ return sb->s_export_op->get_uuid(sb, b->simple.sig, &b->simple.sig_len,
+ &b->simple.offset);
+}
+
+static __be32
+nfsd4_block_proc_getdeviceinfo(struct super_block *sb,
+ struct nfs4_client *clp,
+ struct nfsd4_getdeviceinfo *gdp)
+{
+ if (sb->s_bdev != sb->s_bdev->bd_contains)
+ return nfserr_inval;
+ return nfserrno(nfsd4_block_get_device_info_simple(sb, gdp));
+}
+
+static __be32
+nfsd4_block_proc_layoutcommit(struct inode *inode,
+ struct nfsd4_layoutcommit *lcp)
+{
+ struct iomap *iomaps;
+ int nr_iomaps;
+
+ nr_iomaps = nfsd4_block_decode_layoutupdate(lcp->lc_up_layout,
+ lcp->lc_up_len, &iomaps, 1 << inode->i_blkbits);
+ if (nr_iomaps < 0)
+ return nfserrno(nr_iomaps);
+
+ return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps);
+}
+
const struct nfsd4_layout_ops bl_layout_ops = {
/*
* Pretend that we send notification to the client. This is a blatant
.encode_layoutget = nfsd4_block_encode_layoutget,
.proc_layoutcommit = nfsd4_block_proc_layoutcommit,
};
+#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;
+ size_t bufflen = 252, len, id_len;
+ u8 *buf, *d, type, assoc;
+ int error;
+
+ buf = kzalloc(bufflen, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ rq = blk_get_request(q, READ, GFP_KERNEL);
+ if (IS_ERR(rq)) {
+ error = -ENOMEM;
+ goto out_free_buf;
+ }
+ blk_rq_set_block_pc(rq);
+
+ error = blk_rq_map_kern(q, rq, buf, bufflen, GFP_KERNEL);
+ if (error)
+ goto out_put_request;
+
+ rq->cmd[0] = INQUIRY;
+ rq->cmd[1] = 1;
+ rq->cmd[2] = 0x83;
+ rq->cmd[3] = bufflen >> 8;
+ rq->cmd[4] = bufflen & 0xff;
+ rq->cmd_len = COMMAND_SIZE(INQUIRY);
+
+ error = blk_execute_rq(rq->q, NULL, rq, 1);
+ if (error) {
+ pr_err("pNFS: INQUIRY 0x83 failed with: %x\n",
+ rq->errors);
+ goto out_put_request;
+ }
+
+ len = (buf[2] << 8) + buf[3] + 4;
+ if (len > bufflen) {
+ 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 0x0100000000000000
+
+/*
+ * We use the client ID as a unique key for the reservations.
+ * This allows us to easily fence a client when recalls fail.
+ */
+static u64 nfsd4_scsi_pr_key(struct nfs4_client *clp)
+{
+ return ((u64)clp->cl_clientid.cl_boot << 32) | clp->cl_clientid.cl_id;
+}
+
+static int
+nfsd4_block_get_device_info_scsi(struct super_block *sb,
+ struct nfs4_client *clp,
+ struct nfsd4_getdeviceinfo *gdp)
+{
+ struct pnfs_block_deviceaddr *dev;
+ struct pnfs_block_volume *b;
+ const struct pr_ops *ops;
+ int error;
+
+ dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) +
+ sizeof(struct pnfs_block_volume), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+ gdp->gd_device = dev;
+
+ dev->nr_volumes = 1;
+ b = &dev->volumes[0];
+
+ 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;
+
+ 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;
+ }
+
+ error = ops->pr_register(sb->s_bdev, 0, NFSD_MDS_PR_KEY, true);
+ if (error) {
+ pr_err("pNFS: failed to register key for device %s.\n",
+ sb->s_id);
+ return -EINVAL;
+ }
+
+ error = ops->pr_reserve(sb->s_bdev, NFSD_MDS_PR_KEY,
+ PR_EXCLUSIVE_ACCESS_REG_ONLY, 0);
+ if (error) {
+ pr_err("pNFS: failed to reserve device %s.\n",
+ sb->s_id);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static __be32
+nfsd4_scsi_proc_getdeviceinfo(struct super_block *sb,
+ struct nfs4_client *clp,
+ struct nfsd4_getdeviceinfo *gdp)
+{
+ if (sb->s_bdev != sb->s_bdev->bd_contains)
+ return nfserr_inval;
+ return nfserrno(nfsd4_block_get_device_info_scsi(sb, clp, gdp));
+}
+static __be32
+nfsd4_scsi_proc_layoutcommit(struct inode *inode,
+ struct nfsd4_layoutcommit *lcp)
+{
+ struct iomap *iomaps;
+ int nr_iomaps;
+
+ nr_iomaps = nfsd4_scsi_decode_layoutupdate(lcp->lc_up_layout,
+ lcp->lc_up_len, &iomaps, 1 << inode->i_blkbits);
+ if (nr_iomaps < 0)
+ return nfserrno(nr_iomaps);
+
+ return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps);
+}
+
+static void
+nfsd4_scsi_fence_client(struct nfs4_layout_stateid *ls)
+{
+ struct nfs4_client *clp = ls->ls_stid.sc_client;
+ struct block_device *bdev = ls->ls_file->f_path.mnt->mnt_sb->s_bdev;
+
+ bdev->bd_disk->fops->pr_ops->pr_preempt(bdev, NFSD_MDS_PR_KEY,
+ nfsd4_scsi_pr_key(clp), 0, true);
+}
+
+const struct nfsd4_layout_ops scsi_layout_ops = {
+ /*
+ * Pretend that we send notification to the client. This is a blatant
+ * lie to force recent Linux clients to cache our device IDs.
+ * We rarely ever change the device ID, so the harm of leaking deviceids
+ * for a while isn't too bad. Unfortunately RFC5661 is a complete mess
+ * in this regard, but I filed errata 4119 for this a while ago, and
+ * hopefully the Linux client will eventually start caching deviceids
+ * without this again.
+ */
+ .notify_types =
+ NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE,
+ .proc_getdeviceinfo = nfsd4_scsi_proc_getdeviceinfo,
+ .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo,
+ .proc_layoutget = nfsd4_block_proc_layoutget,
+ .encode_layoutget = nfsd4_block_encode_layoutget,
+ .proc_layoutcommit = nfsd4_scsi_proc_layoutcommit,
+ .fence_client = nfsd4_scsi_fence_client,
+};
+#endif /* CONFIG_NFSD_SCSILAYOUT */
projects / linux-2.6-block.git / blobdiff