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-rw-r--r--fs/nfsd/blocklayout.c433
1 files changed, 433 insertions, 0 deletions
diff --git a/fs/nfsd/blocklayout.c b/fs/nfsd/blocklayout.c
new file mode 100644
index 000000000..a07c39c94
--- /dev/null
+++ b/fs/nfsd/blocklayout.c
@@ -0,0 +1,433 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2014-2016 Christoph Hellwig.
+ */
+#include <linux/exportfs.h>
+#include <linux/iomap.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 <scsi/scsi_request.h>
+
+#include "blocklayoutxdr.h"
+#include "pnfs.h"
+#include "filecache.h"
+
+#define NFSDDBG_FACILITY NFSDDBG_PNFS
+
+
+static __be32
+nfsd4_block_proc_layoutget(struct inode *inode, const struct svc_fh *fhp,
+ struct nfsd4_layoutget *args)
+{
+ struct nfsd4_layout_seg *seg = &args->lg_seg;
+ struct super_block *sb = inode->i_sb;
+ u32 block_size = i_blocksize(inode);
+ struct pnfs_block_extent *bex;
+ struct iomap iomap;
+ u32 device_generation = 0;
+ int error;
+
+ if (seg->offset & (block_size - 1)) {
+ dprintk("pnfsd: I/O misaligned\n");
+ goto out_layoutunavailable;
+ }
+
+ /*
+ * Some clients barf on non-zero block numbers for NONE or INVALID
+ * layouts, so make sure to zero the whole structure.
+ */
+ error = -ENOMEM;
+ bex = kzalloc(sizeof(*bex), GFP_KERNEL);
+ if (!bex)
+ goto out_error;
+ args->lg_content = bex;
+
+ error = sb->s_export_op->map_blocks(inode, seg->offset, seg->length,
+ &iomap, seg->iomode != IOMODE_READ,
+ &device_generation);
+ if (error) {
+ if (error == -ENXIO)
+ goto out_layoutunavailable;
+ goto out_error;
+ }
+
+ if (iomap.length < args->lg_minlength) {
+ dprintk("pnfsd: extent smaller than minlength\n");
+ goto out_layoutunavailable;
+ }
+
+ switch (iomap.type) {
+ case IOMAP_MAPPED:
+ if (seg->iomode == IOMODE_READ)
+ bex->es = PNFS_BLOCK_READ_DATA;
+ else
+ bex->es = PNFS_BLOCK_READWRITE_DATA;
+ bex->soff = iomap.addr;
+ break;
+ case IOMAP_UNWRITTEN:
+ if (seg->iomode & IOMODE_RW) {
+ /*
+ * Crack monkey special case from section 2.3.1.
+ */
+ if (args->lg_minlength == 0) {
+ dprintk("pnfsd: no soup for you!\n");
+ goto out_layoutunavailable;
+ }
+
+ bex->es = PNFS_BLOCK_INVALID_DATA;
+ bex->soff = iomap.addr;
+ break;
+ }
+ fallthrough;
+ case IOMAP_HOLE:
+ if (seg->iomode == IOMODE_READ) {
+ bex->es = PNFS_BLOCK_NONE_DATA;
+ break;
+ }
+ fallthrough;
+ case IOMAP_DELALLOC:
+ default:
+ WARN(1, "pnfsd: filesystem returned %d extent\n", iomap.type);
+ goto out_layoutunavailable;
+ }
+
+ error = nfsd4_set_deviceid(&bex->vol_id, fhp, device_generation);
+ if (error)
+ goto out_error;
+ bex->foff = iomap.offset;
+ bex->len = iomap.length;
+
+ seg->offset = iomap.offset;
+ seg->length = iomap.length;
+
+ dprintk("GET: 0x%llx:0x%llx %d\n", bex->foff, bex->len, bex->es);
+ return 0;
+
+out_error:
+ seg->length = 0;
+ return nfserrno(error);
+out_layoutunavailable:
+ seg->length = 0;
+ return nfserr_layoutunavailable;
+}
+
+static __be32
+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 };
+ int error;
+
+ if (lcp->lc_mtime.tv_nsec == UTIME_NOW ||
+ timespec64_compare(&lcp->lc_mtime, &inode->i_mtime) < 0)
+ lcp->lc_mtime = current_time(inode);
+ iattr.ia_valid |= ATTR_ATIME | ATTR_CTIME | ATTR_MTIME;
+ iattr.ia_atime = iattr.ia_ctime = iattr.ia_mtime = lcp->lc_mtime;
+
+ if (new_size > i_size_read(inode)) {
+ iattr.ia_valid |= ATTR_SIZE;
+ iattr.ia_size = new_size;
+ }
+
+ error = inode->i_sb->s_export_op->commit_blocks(inode, iomaps,
+ nr_iomaps, &iattr);
+ kfree(iomaps);
+ 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 svc_rqst *rqstp,
+ struct nfs4_client *clp,
+ struct nfsd4_getdeviceinfo *gdp)
+{
+ if (bdev_is_partition(sb->s_bdev))
+ 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, i_blocksize(inode));
+ 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
+ * 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_block_proc_getdeviceinfo,
+ .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo,
+ .proc_layoutget = nfsd4_block_proc_layoutget,
+ .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;
+ 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_SCSI_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(rq->q, 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
+
+/*
+ * 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 svc_rqst *rqstp,
+ struct nfs4_client *clp,
+ struct nfsd4_getdeviceinfo *gdp)
+{
+ if (bdev_is_partition(sb->s_bdev))
+ 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, i_blocksize(inode));
+ 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->nf_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 */