summaryrefslogtreecommitdiff
path: root/fs/nfs/flexfilelayout
diff options
context:
space:
mode:
Diffstat (limited to 'fs/nfs/flexfilelayout')
-rw-r--r--fs/nfs/flexfilelayout/Makefile5
-rw-r--r--fs/nfs/flexfilelayout/flexfilelayout.c1535
-rw-r--r--fs/nfs/flexfilelayout/flexfilelayout.h155
-rw-r--r--fs/nfs/flexfilelayout/flexfilelayoutdev.c553
4 files changed, 2248 insertions, 0 deletions
diff --git a/fs/nfs/flexfilelayout/Makefile b/fs/nfs/flexfilelayout/Makefile
new file mode 100644
index 000000000..1d2c9f6bb
--- /dev/null
+++ b/fs/nfs/flexfilelayout/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for the pNFS Flexfile Layout Driver kernel module
+#
+obj-$(CONFIG_PNFS_FLEXFILE_LAYOUT) += nfs_layout_flexfiles.o
+nfs_layout_flexfiles-y := flexfilelayout.o flexfilelayoutdev.o
diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c
new file mode 100644
index 000000000..6f5f0f425
--- /dev/null
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -0,0 +1,1535 @@
+/*
+ * Module for pnfs flexfile layout driver.
+ *
+ * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
+ *
+ * Tao Peng <bergwolf@primarydata.com>
+ */
+
+#include <linux/nfs_fs.h>
+#include <linux/nfs_page.h>
+#include <linux/module.h>
+
+#include <linux/sunrpc/metrics.h>
+
+#include "flexfilelayout.h"
+#include "../nfs4session.h"
+#include "../nfs4idmap.h"
+#include "../internal.h"
+#include "../delegation.h"
+#include "../nfs4trace.h"
+#include "../iostat.h"
+#include "../nfs.h"
+
+#define NFSDBG_FACILITY NFSDBG_PNFS_LD
+
+#define FF_LAYOUT_POLL_RETRY_MAX (15*HZ)
+
+static struct pnfs_layout_hdr *
+ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
+{
+ struct nfs4_flexfile_layout *ffl;
+
+ ffl = kzalloc(sizeof(*ffl), gfp_flags);
+ if (ffl) {
+ INIT_LIST_HEAD(&ffl->error_list);
+ return &ffl->generic_hdr;
+ } else
+ return NULL;
+}
+
+static void
+ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
+{
+ struct nfs4_ff_layout_ds_err *err, *n;
+
+ list_for_each_entry_safe(err, n, &FF_LAYOUT_FROM_HDR(lo)->error_list,
+ list) {
+ list_del(&err->list);
+ kfree(err);
+ }
+ kfree(FF_LAYOUT_FROM_HDR(lo));
+}
+
+static int decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
+{
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
+ if (unlikely(p == NULL))
+ return -ENOBUFS;
+ memcpy(stateid, p, NFS4_STATEID_SIZE);
+ dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
+ p[0], p[1], p[2], p[3]);
+ return 0;
+}
+
+static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
+{
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
+ if (unlikely(!p))
+ return -ENOBUFS;
+ memcpy(devid, p, NFS4_DEVICEID4_SIZE);
+ nfs4_print_deviceid(devid);
+ return 0;
+}
+
+static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
+{
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, 4);
+ if (unlikely(!p))
+ return -ENOBUFS;
+ fh->size = be32_to_cpup(p++);
+ if (fh->size > sizeof(struct nfs_fh)) {
+ printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
+ fh->size);
+ return -EOVERFLOW;
+ }
+ /* fh.data */
+ p = xdr_inline_decode(xdr, fh->size);
+ if (unlikely(!p))
+ return -ENOBUFS;
+ memcpy(&fh->data, p, fh->size);
+ dprintk("%s: fh len %d\n", __func__, fh->size);
+
+ return 0;
+}
+
+/*
+ * Currently only stringified uids and gids are accepted.
+ * I.e., kerberos is not supported to the DSes, so no pricipals.
+ *
+ * That means that one common function will suffice, but when
+ * principals are added, this should be split to accomodate
+ * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
+ */
+static int
+decode_name(struct xdr_stream *xdr, u32 *id)
+{
+ __be32 *p;
+ int len;
+
+ /* opaque_length(4)*/
+ p = xdr_inline_decode(xdr, 4);
+ if (unlikely(!p))
+ return -ENOBUFS;
+ len = be32_to_cpup(p++);
+ if (len < 0)
+ return -EINVAL;
+
+ dprintk("%s: len %u\n", __func__, len);
+
+ /* opaque body */
+ p = xdr_inline_decode(xdr, len);
+ if (unlikely(!p))
+ return -ENOBUFS;
+
+ if (!nfs_map_string_to_numeric((char *)p, len, id))
+ return -EINVAL;
+
+ return 0;
+}
+
+static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
+{
+ int i;
+
+ if (fls->mirror_array) {
+ for (i = 0; i < fls->mirror_array_cnt; i++) {
+ /* normally mirror_ds is freed in
+ * .free_deviceid_node but we still do it here
+ * for .alloc_lseg error path */
+ if (fls->mirror_array[i]) {
+ kfree(fls->mirror_array[i]->fh_versions);
+ nfs4_ff_layout_put_deviceid(fls->mirror_array[i]->mirror_ds);
+ kfree(fls->mirror_array[i]);
+ }
+ }
+ kfree(fls->mirror_array);
+ fls->mirror_array = NULL;
+ }
+}
+
+static int ff_layout_check_layout(struct nfs4_layoutget_res *lgr)
+{
+ int ret = 0;
+
+ dprintk("--> %s\n", __func__);
+
+ /* FIXME: remove this check when layout segment support is added */
+ if (lgr->range.offset != 0 ||
+ lgr->range.length != NFS4_MAX_UINT64) {
+ dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
+ __func__);
+ ret = -EINVAL;
+ }
+
+ dprintk("--> %s returns %d\n", __func__, ret);
+ return ret;
+}
+
+static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
+{
+ if (fls) {
+ ff_layout_free_mirror_array(fls);
+ kfree(fls);
+ }
+}
+
+static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
+{
+ struct nfs4_ff_layout_mirror *tmp;
+ int i, j;
+
+ for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
+ for (j = i + 1; j < fls->mirror_array_cnt; j++)
+ if (fls->mirror_array[i]->efficiency <
+ fls->mirror_array[j]->efficiency) {
+ tmp = fls->mirror_array[i];
+ fls->mirror_array[i] = fls->mirror_array[j];
+ fls->mirror_array[j] = tmp;
+ }
+ }
+}
+
+static struct pnfs_layout_segment *
+ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
+ struct nfs4_layoutget_res *lgr,
+ gfp_t gfp_flags)
+{
+ struct pnfs_layout_segment *ret;
+ struct nfs4_ff_layout_segment *fls = NULL;
+ struct xdr_stream stream;
+ struct xdr_buf buf;
+ struct page *scratch;
+ u64 stripe_unit;
+ u32 mirror_array_cnt;
+ __be32 *p;
+ int i, rc;
+
+ dprintk("--> %s\n", __func__);
+ scratch = alloc_page(gfp_flags);
+ if (!scratch)
+ return ERR_PTR(-ENOMEM);
+
+ xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
+ lgr->layoutp->len);
+ xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
+
+ /* stripe unit and mirror_array_cnt */
+ rc = -EIO;
+ p = xdr_inline_decode(&stream, 8 + 4);
+ if (!p)
+ goto out_err_free;
+
+ p = xdr_decode_hyper(p, &stripe_unit);
+ mirror_array_cnt = be32_to_cpup(p++);
+ dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
+ stripe_unit, mirror_array_cnt);
+
+ if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
+ mirror_array_cnt == 0)
+ goto out_err_free;
+
+ rc = -ENOMEM;
+ fls = kzalloc(sizeof(*fls), gfp_flags);
+ if (!fls)
+ goto out_err_free;
+
+ fls->mirror_array_cnt = mirror_array_cnt;
+ fls->stripe_unit = stripe_unit;
+ fls->mirror_array = kcalloc(fls->mirror_array_cnt,
+ sizeof(fls->mirror_array[0]), gfp_flags);
+ if (fls->mirror_array == NULL)
+ goto out_err_free;
+
+ for (i = 0; i < fls->mirror_array_cnt; i++) {
+ struct nfs4_deviceid devid;
+ struct nfs4_deviceid_node *idnode;
+ u32 ds_count;
+ u32 fh_count;
+ int j;
+
+ rc = -EIO;
+ p = xdr_inline_decode(&stream, 4);
+ if (!p)
+ goto out_err_free;
+ ds_count = be32_to_cpup(p);
+
+ /* FIXME: allow for striping? */
+ if (ds_count != 1)
+ goto out_err_free;
+
+ fls->mirror_array[i] =
+ kzalloc(sizeof(struct nfs4_ff_layout_mirror),
+ gfp_flags);
+ if (fls->mirror_array[i] == NULL) {
+ rc = -ENOMEM;
+ goto out_err_free;
+ }
+
+ spin_lock_init(&fls->mirror_array[i]->lock);
+ fls->mirror_array[i]->ds_count = ds_count;
+
+ /* deviceid */
+ rc = decode_deviceid(&stream, &devid);
+ if (rc)
+ goto out_err_free;
+
+ idnode = nfs4_find_get_deviceid(NFS_SERVER(lh->plh_inode),
+ &devid, lh->plh_lc_cred,
+ gfp_flags);
+ /*
+ * upon success, mirror_ds is allocated by previous
+ * getdeviceinfo, or newly by .alloc_deviceid_node
+ * nfs4_find_get_deviceid failure is indeed getdeviceinfo falure
+ */
+ if (idnode)
+ fls->mirror_array[i]->mirror_ds =
+ FF_LAYOUT_MIRROR_DS(idnode);
+ else
+ goto out_err_free;
+
+ /* efficiency */
+ rc = -EIO;
+ p = xdr_inline_decode(&stream, 4);
+ if (!p)
+ goto out_err_free;
+ fls->mirror_array[i]->efficiency = be32_to_cpup(p);
+
+ /* stateid */
+ rc = decode_stateid(&stream, &fls->mirror_array[i]->stateid);
+ if (rc)
+ goto out_err_free;
+
+ /* fh */
+ p = xdr_inline_decode(&stream, 4);
+ if (!p)
+ goto out_err_free;
+ fh_count = be32_to_cpup(p);
+
+ fls->mirror_array[i]->fh_versions =
+ kzalloc(fh_count * sizeof(struct nfs_fh),
+ gfp_flags);
+ if (fls->mirror_array[i]->fh_versions == NULL) {
+ rc = -ENOMEM;
+ goto out_err_free;
+ }
+
+ for (j = 0; j < fh_count; j++) {
+ rc = decode_nfs_fh(&stream,
+ &fls->mirror_array[i]->fh_versions[j]);
+ if (rc)
+ goto out_err_free;
+ }
+
+ fls->mirror_array[i]->fh_versions_cnt = fh_count;
+
+ /* user */
+ rc = decode_name(&stream, &fls->mirror_array[i]->uid);
+ if (rc)
+ goto out_err_free;
+
+ /* group */
+ rc = decode_name(&stream, &fls->mirror_array[i]->gid);
+ if (rc)
+ goto out_err_free;
+
+ dprintk("%s: uid %d gid %d\n", __func__,
+ fls->mirror_array[i]->uid,
+ fls->mirror_array[i]->gid);
+ }
+
+ ff_layout_sort_mirrors(fls);
+ rc = ff_layout_check_layout(lgr);
+ if (rc)
+ goto out_err_free;
+
+ ret = &fls->generic_hdr;
+ dprintk("<-- %s (success)\n", __func__);
+out_free_page:
+ __free_page(scratch);
+ return ret;
+out_err_free:
+ _ff_layout_free_lseg(fls);
+ ret = ERR_PTR(rc);
+ dprintk("<-- %s (%d)\n", __func__, rc);
+ goto out_free_page;
+}
+
+static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout)
+{
+ struct pnfs_layout_segment *lseg;
+
+ list_for_each_entry(lseg, &layout->plh_segs, pls_list)
+ if (lseg->pls_range.iomode == IOMODE_RW)
+ return true;
+
+ return false;
+}
+
+static void
+ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
+{
+ struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
+ int i;
+
+ dprintk("--> %s\n", __func__);
+
+ for (i = 0; i < fls->mirror_array_cnt; i++) {
+ if (fls->mirror_array[i]) {
+ nfs4_ff_layout_put_deviceid(fls->mirror_array[i]->mirror_ds);
+ fls->mirror_array[i]->mirror_ds = NULL;
+ if (fls->mirror_array[i]->cred) {
+ put_rpccred(fls->mirror_array[i]->cred);
+ fls->mirror_array[i]->cred = NULL;
+ }
+ }
+ }
+
+ if (lseg->pls_range.iomode == IOMODE_RW) {
+ struct nfs4_flexfile_layout *ffl;
+ struct inode *inode;
+
+ ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
+ inode = ffl->generic_hdr.plh_inode;
+ spin_lock(&inode->i_lock);
+ if (!ff_layout_has_rw_segments(lseg->pls_layout)) {
+ ffl->commit_info.nbuckets = 0;
+ kfree(ffl->commit_info.buckets);
+ ffl->commit_info.buckets = NULL;
+ }
+ spin_unlock(&inode->i_lock);
+ }
+ _ff_layout_free_lseg(fls);
+}
+
+/* Return 1 until we have multiple lsegs support */
+static int
+ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls)
+{
+ return 1;
+}
+
+static int
+ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg,
+ struct nfs_commit_info *cinfo,
+ gfp_t gfp_flags)
+{
+ struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
+ struct pnfs_commit_bucket *buckets;
+ int size;
+
+ if (cinfo->ds->nbuckets != 0) {
+ /* This assumes there is only one RW lseg per file.
+ * To support multiple lseg per file, we need to
+ * change struct pnfs_commit_bucket to allow dynamic
+ * increasing nbuckets.
+ */
+ return 0;
+ }
+
+ size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg);
+
+ buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
+ gfp_flags);
+ if (!buckets)
+ return -ENOMEM;
+ else {
+ int i;
+
+ spin_lock(cinfo->lock);
+ if (cinfo->ds->nbuckets != 0)
+ kfree(buckets);
+ else {
+ cinfo->ds->buckets = buckets;
+ cinfo->ds->nbuckets = size;
+ for (i = 0; i < size; i++) {
+ INIT_LIST_HEAD(&buckets[i].written);
+ INIT_LIST_HEAD(&buckets[i].committing);
+ /* mark direct verifier as unset */
+ buckets[i].direct_verf.committed =
+ NFS_INVALID_STABLE_HOW;
+ }
+ }
+ spin_unlock(cinfo->lock);
+ return 0;
+ }
+}
+
+static struct nfs4_pnfs_ds *
+ff_layout_choose_best_ds_for_read(struct nfs_pageio_descriptor *pgio,
+ int *best_idx)
+{
+ struct nfs4_ff_layout_segment *fls;
+ struct nfs4_pnfs_ds *ds;
+ int idx;
+
+ fls = FF_LAYOUT_LSEG(pgio->pg_lseg);
+ /* mirrors are sorted by efficiency */
+ for (idx = 0; idx < fls->mirror_array_cnt; idx++) {
+ ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, idx, false);
+ if (ds) {
+ *best_idx = idx;
+ return ds;
+ }
+ }
+
+ return NULL;
+}
+
+static void
+ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
+ struct nfs_page *req)
+{
+ struct nfs_pgio_mirror *pgm;
+ struct nfs4_ff_layout_mirror *mirror;
+ struct nfs4_pnfs_ds *ds;
+ int ds_idx;
+
+ /* Use full layout for now */
+ if (!pgio->pg_lseg)
+ pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
+ req->wb_context,
+ 0,
+ NFS4_MAX_UINT64,
+ IOMODE_READ,
+ GFP_KERNEL);
+ /* If no lseg, fall back to read through mds */
+ if (pgio->pg_lseg == NULL)
+ goto out_mds;
+
+ ds = ff_layout_choose_best_ds_for_read(pgio, &ds_idx);
+ if (!ds)
+ goto out_mds;
+ mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
+
+ pgio->pg_mirror_idx = ds_idx;
+
+ /* read always uses only one mirror - idx 0 for pgio layer */
+ pgm = &pgio->pg_mirrors[0];
+ pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
+
+ return;
+out_mds:
+ pnfs_put_lseg(pgio->pg_lseg);
+ pgio->pg_lseg = NULL;
+ nfs_pageio_reset_read_mds(pgio);
+}
+
+static void
+ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
+ struct nfs_page *req)
+{
+ struct nfs4_ff_layout_mirror *mirror;
+ struct nfs_pgio_mirror *pgm;
+ struct nfs_commit_info cinfo;
+ struct nfs4_pnfs_ds *ds;
+ int i;
+ int status;
+
+ if (!pgio->pg_lseg)
+ pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
+ req->wb_context,
+ 0,
+ NFS4_MAX_UINT64,
+ IOMODE_RW,
+ GFP_NOFS);
+ /* If no lseg, fall back to write through mds */
+ if (pgio->pg_lseg == NULL)
+ goto out_mds;
+
+ nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
+ status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
+ if (status < 0)
+ goto out_mds;
+
+ /* Use a direct mapping of ds_idx to pgio mirror_idx */
+ if (WARN_ON_ONCE(pgio->pg_mirror_count !=
+ FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)))
+ goto out_mds;
+
+ for (i = 0; i < pgio->pg_mirror_count; i++) {
+ ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, i, true);
+ if (!ds)
+ goto out_mds;
+ pgm = &pgio->pg_mirrors[i];
+ mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
+ pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
+ }
+
+ return;
+
+out_mds:
+ pnfs_put_lseg(pgio->pg_lseg);
+ pgio->pg_lseg = NULL;
+ nfs_pageio_reset_write_mds(pgio);
+}
+
+static unsigned int
+ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
+ struct nfs_page *req)
+{
+ if (!pgio->pg_lseg)
+ pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
+ req->wb_context,
+ 0,
+ NFS4_MAX_UINT64,
+ IOMODE_RW,
+ GFP_NOFS);
+ if (pgio->pg_lseg)
+ return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
+
+ /* no lseg means that pnfs is not in use, so no mirroring here */
+ pnfs_put_lseg(pgio->pg_lseg);
+ pgio->pg_lseg = NULL;
+ nfs_pageio_reset_write_mds(pgio);
+ return 1;
+}
+
+static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
+ .pg_init = ff_layout_pg_init_read,
+ .pg_test = pnfs_generic_pg_test,
+ .pg_doio = pnfs_generic_pg_readpages,
+ .pg_cleanup = pnfs_generic_pg_cleanup,
+};
+
+static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
+ .pg_init = ff_layout_pg_init_write,
+ .pg_test = pnfs_generic_pg_test,
+ .pg_doio = pnfs_generic_pg_writepages,
+ .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
+ .pg_cleanup = pnfs_generic_pg_cleanup,
+};
+
+static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
+{
+ struct rpc_task *task = &hdr->task;
+
+ pnfs_layoutcommit_inode(hdr->inode, false);
+
+ if (retry_pnfs) {
+ dprintk("%s Reset task %5u for i/o through pNFS "
+ "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
+ hdr->task.tk_pid,
+ hdr->inode->i_sb->s_id,
+ (unsigned long long)NFS_FILEID(hdr->inode),
+ hdr->args.count,
+ (unsigned long long)hdr->args.offset);
+
+ if (!hdr->dreq) {
+ struct nfs_open_context *ctx;
+
+ ctx = nfs_list_entry(hdr->pages.next)->wb_context;
+ set_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags);
+ hdr->completion_ops->error_cleanup(&hdr->pages);
+ } else {
+ nfs_direct_set_resched_writes(hdr->dreq);
+ /* fake unstable write to let common nfs resend pages */
+ hdr->verf.committed = NFS_UNSTABLE;
+ hdr->good_bytes = hdr->args.count;
+ }
+ return;
+ }
+
+ if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
+ dprintk("%s Reset task %5u for i/o through MDS "
+ "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
+ hdr->task.tk_pid,
+ hdr->inode->i_sb->s_id,
+ (unsigned long long)NFS_FILEID(hdr->inode),
+ hdr->args.count,
+ (unsigned long long)hdr->args.offset);
+
+ task->tk_status = pnfs_write_done_resend_to_mds(hdr);
+ }
+}
+
+static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
+{
+ struct rpc_task *task = &hdr->task;
+
+ pnfs_layoutcommit_inode(hdr->inode, false);
+
+ if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
+ dprintk("%s Reset task %5u for i/o through MDS "
+ "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
+ hdr->task.tk_pid,
+ hdr->inode->i_sb->s_id,
+ (unsigned long long)NFS_FILEID(hdr->inode),
+ hdr->args.count,
+ (unsigned long long)hdr->args.offset);
+
+ task->tk_status = pnfs_read_done_resend_to_mds(hdr);
+ }
+}
+
+static int ff_layout_async_handle_error_v4(struct rpc_task *task,
+ struct nfs4_state *state,
+ struct nfs_client *clp,
+ struct pnfs_layout_segment *lseg,
+ int idx)
+{
+ struct pnfs_layout_hdr *lo = lseg->pls_layout;
+ struct inode *inode = lo->plh_inode;
+ struct nfs_server *mds_server = NFS_SERVER(inode);
+
+ struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
+ struct nfs_client *mds_client = mds_server->nfs_client;
+ struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
+
+ if (task->tk_status >= 0)
+ return 0;
+
+ switch (task->tk_status) {
+ /* MDS state errors */
+ case -NFS4ERR_DELEG_REVOKED:
+ case -NFS4ERR_ADMIN_REVOKED:
+ case -NFS4ERR_BAD_STATEID:
+ if (state == NULL)
+ break;
+ nfs_remove_bad_delegation(state->inode);
+ case -NFS4ERR_OPENMODE:
+ if (state == NULL)
+ break;
+ if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
+ goto out_bad_stateid;
+ goto wait_on_recovery;
+ case -NFS4ERR_EXPIRED:
+ if (state != NULL) {
+ if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
+ goto out_bad_stateid;
+ }
+ nfs4_schedule_lease_recovery(mds_client);
+ goto wait_on_recovery;
+ /* DS session errors */
+ case -NFS4ERR_BADSESSION:
+ case -NFS4ERR_BADSLOT:
+ case -NFS4ERR_BAD_HIGH_SLOT:
+ case -NFS4ERR_DEADSESSION:
+ case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
+ case -NFS4ERR_SEQ_FALSE_RETRY:
+ case -NFS4ERR_SEQ_MISORDERED:
+ dprintk("%s ERROR %d, Reset session. Exchangeid "
+ "flags 0x%x\n", __func__, task->tk_status,
+ clp->cl_exchange_flags);
+ nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
+ break;
+ case -NFS4ERR_DELAY:
+ case -NFS4ERR_GRACE:
+ rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
+ break;
+ case -NFS4ERR_RETRY_UNCACHED_REP:
+ break;
+ /* Invalidate Layout errors */
+ case -NFS4ERR_PNFS_NO_LAYOUT:
+ case -ESTALE: /* mapped NFS4ERR_STALE */
+ case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
+ case -EISDIR: /* mapped NFS4ERR_ISDIR */
+ case -NFS4ERR_FHEXPIRED:
+ case -NFS4ERR_WRONG_TYPE:
+ dprintk("%s Invalid layout error %d\n", __func__,
+ task->tk_status);
+ /*
+ * Destroy layout so new i/o will get a new layout.
+ * Layout will not be destroyed until all current lseg
+ * references are put. Mark layout as invalid to resend failed
+ * i/o and all i/o waiting on the slot table to the MDS until
+ * layout is destroyed and a new valid layout is obtained.
+ */
+ pnfs_destroy_layout(NFS_I(inode));
+ rpc_wake_up(&tbl->slot_tbl_waitq);
+ goto reset;
+ /* RPC connection errors */
+ case -ECONNREFUSED:
+ case -EHOSTDOWN:
+ case -EHOSTUNREACH:
+ case -ENETUNREACH:
+ case -EIO:
+ case -ETIMEDOUT:
+ case -EPIPE:
+ dprintk("%s DS connection error %d\n", __func__,
+ task->tk_status);
+ nfs4_mark_deviceid_unavailable(devid);
+ rpc_wake_up(&tbl->slot_tbl_waitq);
+ /* fall through */
+ default:
+ if (ff_layout_has_available_ds(lseg))
+ return -NFS4ERR_RESET_TO_PNFS;
+reset:
+ dprintk("%s Retry through MDS. Error %d\n", __func__,
+ task->tk_status);
+ return -NFS4ERR_RESET_TO_MDS;
+ }
+out:
+ task->tk_status = 0;
+ return -EAGAIN;
+out_bad_stateid:
+ task->tk_status = -EIO;
+ return 0;
+wait_on_recovery:
+ rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
+ if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
+ rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
+ goto out;
+}
+
+/* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
+static int ff_layout_async_handle_error_v3(struct rpc_task *task,
+ struct pnfs_layout_segment *lseg,
+ int idx)
+{
+ struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
+
+ if (task->tk_status >= 0)
+ return 0;
+
+ if (task->tk_status != -EJUKEBOX) {
+ dprintk("%s DS connection error %d\n", __func__,
+ task->tk_status);
+ nfs4_mark_deviceid_unavailable(devid);
+ if (ff_layout_has_available_ds(lseg))
+ return -NFS4ERR_RESET_TO_PNFS;
+ else
+ return -NFS4ERR_RESET_TO_MDS;
+ }
+
+ if (task->tk_status == -EJUKEBOX)
+ nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
+ task->tk_status = 0;
+ rpc_restart_call(task);
+ rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
+ return -EAGAIN;
+}
+
+static int ff_layout_async_handle_error(struct rpc_task *task,
+ struct nfs4_state *state,
+ struct nfs_client *clp,
+ struct pnfs_layout_segment *lseg,
+ int idx)
+{
+ int vers = clp->cl_nfs_mod->rpc_vers->number;
+
+ switch (vers) {
+ case 3:
+ return ff_layout_async_handle_error_v3(task, lseg, idx);
+ case 4:
+ return ff_layout_async_handle_error_v4(task, state, clp,
+ lseg, idx);
+ default:
+ /* should never happen */
+ WARN_ON_ONCE(1);
+ return 0;
+ }
+}
+
+static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
+ int idx, u64 offset, u64 length,
+ u32 status, int opnum)
+{
+ struct nfs4_ff_layout_mirror *mirror;
+ int err;
+
+ mirror = FF_LAYOUT_COMP(lseg, idx);
+ err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
+ mirror, offset, length, status, opnum,
+ GFP_NOIO);
+ dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
+}
+
+/* NFS_PROTO call done callback routines */
+
+static int ff_layout_read_done_cb(struct rpc_task *task,
+ struct nfs_pgio_header *hdr)
+{
+ struct inode *inode;
+ int err;
+
+ trace_nfs4_pnfs_read(hdr, task->tk_status);
+ if (task->tk_status == -ETIMEDOUT && !hdr->res.op_status)
+ hdr->res.op_status = NFS4ERR_NXIO;
+ if (task->tk_status < 0 && hdr->res.op_status)
+ ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
+ hdr->args.offset, hdr->args.count,
+ hdr->res.op_status, OP_READ);
+ err = ff_layout_async_handle_error(task, hdr->args.context->state,
+ hdr->ds_clp, hdr->lseg,
+ hdr->pgio_mirror_idx);
+
+ switch (err) {
+ case -NFS4ERR_RESET_TO_PNFS:
+ set_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
+ &hdr->lseg->pls_layout->plh_flags);
+ pnfs_read_resend_pnfs(hdr);
+ return task->tk_status;
+ case -NFS4ERR_RESET_TO_MDS:
+ inode = hdr->lseg->pls_layout->plh_inode;
+ pnfs_error_mark_layout_for_return(inode, hdr->lseg);
+ ff_layout_reset_read(hdr);
+ return task->tk_status;
+ case -EAGAIN:
+ rpc_restart_call_prepare(task);
+ return -EAGAIN;
+ }
+
+ return 0;
+}
+
+/*
+ * We reference the rpc_cred of the first WRITE that triggers the need for
+ * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
+ * rfc5661 is not clear about which credential should be used.
+ *
+ * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
+ * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
+ * we always send layoutcommit after DS writes.
+ */
+static void
+ff_layout_set_layoutcommit(struct nfs_pgio_header *hdr)
+{
+ pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
+ hdr->mds_offset + hdr->res.count);
+ dprintk("%s inode %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino,
+ (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb);
+}
+
+static bool
+ff_layout_reset_to_mds(struct pnfs_layout_segment *lseg, int idx)
+{
+ /* No mirroring for now */
+ struct nfs4_deviceid_node *node = FF_LAYOUT_DEVID_NODE(lseg, idx);
+
+ return ff_layout_test_devid_unavailable(node);
+}
+
+static int ff_layout_read_prepare_common(struct rpc_task *task,
+ struct nfs_pgio_header *hdr)
+{
+ if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
+ rpc_exit(task, -EIO);
+ return -EIO;
+ }
+ if (ff_layout_reset_to_mds(hdr->lseg, hdr->pgio_mirror_idx)) {
+ dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
+ if (ff_layout_has_available_ds(hdr->lseg))
+ pnfs_read_resend_pnfs(hdr);
+ else
+ ff_layout_reset_read(hdr);
+ rpc_exit(task, 0);
+ return -EAGAIN;
+ }
+ hdr->pgio_done_cb = ff_layout_read_done_cb;
+
+ return 0;
+}
+
+/*
+ * Call ops for the async read/write cases
+ * In the case of dense layouts, the offset needs to be reset to its
+ * original value.
+ */
+static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
+{
+ struct nfs_pgio_header *hdr = data;
+
+ if (ff_layout_read_prepare_common(task, hdr))
+ return;
+
+ rpc_call_start(task);
+}
+
+static int ff_layout_setup_sequence(struct nfs_client *ds_clp,
+ struct nfs4_sequence_args *args,
+ struct nfs4_sequence_res *res,
+ struct rpc_task *task)
+{
+ if (ds_clp->cl_session)
+ return nfs41_setup_sequence(ds_clp->cl_session,
+ args,
+ res,
+ task);
+ return nfs40_setup_sequence(ds_clp->cl_slot_tbl,
+ args,
+ res,
+ task);
+}
+
+static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
+{
+ struct nfs_pgio_header *hdr = data;
+
+ if (ff_layout_read_prepare_common(task, hdr))
+ return;
+
+ if (ff_layout_setup_sequence(hdr->ds_clp,
+ &hdr->args.seq_args,
+ &hdr->res.seq_res,
+ task))
+ return;
+
+ if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
+ hdr->args.lock_context, FMODE_READ) == -EIO)
+ rpc_exit(task, -EIO); /* lost lock, terminate I/O */
+}
+
+static void ff_layout_read_call_done(struct rpc_task *task, void *data)
+{
+ struct nfs_pgio_header *hdr = data;
+
+ dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
+
+ if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
+ task->tk_status == 0) {
+ nfs4_sequence_done(task, &hdr->res.seq_res);
+ return;
+ }
+
+ /* Note this may cause RPC to be resent */
+ hdr->mds_ops->rpc_call_done(task, hdr);
+}
+
+static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
+{
+ struct nfs_pgio_header *hdr = data;
+
+ rpc_count_iostats_metrics(task,
+ &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
+}
+
+static int ff_layout_write_done_cb(struct rpc_task *task,
+ struct nfs_pgio_header *hdr)
+{
+ struct inode *inode;
+ int err;
+
+ trace_nfs4_pnfs_write(hdr, task->tk_status);
+ if (task->tk_status == -ETIMEDOUT && !hdr->res.op_status)
+ hdr->res.op_status = NFS4ERR_NXIO;
+ if (task->tk_status < 0 && hdr->res.op_status)
+ ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
+ hdr->args.offset, hdr->args.count,
+ hdr->res.op_status, OP_WRITE);
+ err = ff_layout_async_handle_error(task, hdr->args.context->state,
+ hdr->ds_clp, hdr->lseg,
+ hdr->pgio_mirror_idx);
+
+ switch (err) {
+ case -NFS4ERR_RESET_TO_PNFS:
+ case -NFS4ERR_RESET_TO_MDS:
+ inode = hdr->lseg->pls_layout->plh_inode;
+ pnfs_error_mark_layout_for_return(inode, hdr->lseg);
+ if (err == -NFS4ERR_RESET_TO_PNFS) {
+ pnfs_set_retry_layoutget(hdr->lseg->pls_layout);
+ ff_layout_reset_write(hdr, true);
+ } else {
+ pnfs_clear_retry_layoutget(hdr->lseg->pls_layout);
+ ff_layout_reset_write(hdr, false);
+ }
+ return task->tk_status;
+ case -EAGAIN:
+ rpc_restart_call_prepare(task);
+ return -EAGAIN;
+ }
+
+ if (hdr->res.verf->committed == NFS_FILE_SYNC ||
+ hdr->res.verf->committed == NFS_DATA_SYNC)
+ ff_layout_set_layoutcommit(hdr);
+
+ return 0;
+}
+
+static int ff_layout_commit_done_cb(struct rpc_task *task,
+ struct nfs_commit_data *data)
+{
+ struct inode *inode;
+ int err;
+
+ trace_nfs4_pnfs_commit_ds(data, task->tk_status);
+ if (task->tk_status == -ETIMEDOUT && !data->res.op_status)
+ data->res.op_status = NFS4ERR_NXIO;
+ if (task->tk_status < 0 && data->res.op_status)
+ ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
+ data->args.offset, data->args.count,
+ data->res.op_status, OP_COMMIT);
+ err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
+ data->lseg, data->ds_commit_index);
+
+ switch (err) {
+ case -NFS4ERR_RESET_TO_PNFS:
+ case -NFS4ERR_RESET_TO_MDS:
+ inode = data->lseg->pls_layout->plh_inode;
+ pnfs_error_mark_layout_for_return(inode, data->lseg);
+ if (err == -NFS4ERR_RESET_TO_PNFS)
+ pnfs_set_retry_layoutget(data->lseg->pls_layout);
+ else
+ pnfs_clear_retry_layoutget(data->lseg->pls_layout);
+ pnfs_generic_prepare_to_resend_writes(data);
+ return -EAGAIN;
+ case -EAGAIN:
+ rpc_restart_call_prepare(task);
+ return -EAGAIN;
+ }
+
+ if (data->verf.committed == NFS_UNSTABLE)
+ pnfs_set_layoutcommit(data->inode, data->lseg, data->lwb);
+
+ return 0;
+}
+
+static int ff_layout_write_prepare_common(struct rpc_task *task,
+ struct nfs_pgio_header *hdr)
+{
+ if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
+ rpc_exit(task, -EIO);
+ return -EIO;
+ }
+
+ if (ff_layout_reset_to_mds(hdr->lseg, hdr->pgio_mirror_idx)) {
+ bool retry_pnfs;
+
+ retry_pnfs = ff_layout_has_available_ds(hdr->lseg);
+ dprintk("%s task %u reset io to %s\n", __func__,
+ task->tk_pid, retry_pnfs ? "pNFS" : "MDS");
+ ff_layout_reset_write(hdr, retry_pnfs);
+ rpc_exit(task, 0);
+ return -EAGAIN;
+ }
+
+ return 0;
+}
+
+static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
+{
+ struct nfs_pgio_header *hdr = data;
+
+ if (ff_layout_write_prepare_common(task, hdr))
+ return;
+
+ rpc_call_start(task);
+}
+
+static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
+{
+ struct nfs_pgio_header *hdr = data;
+
+ if (ff_layout_write_prepare_common(task, hdr))
+ return;
+
+ if (ff_layout_setup_sequence(hdr->ds_clp,
+ &hdr->args.seq_args,
+ &hdr->res.seq_res,
+ task))
+ return;
+
+ if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
+ hdr->args.lock_context, FMODE_WRITE) == -EIO)
+ rpc_exit(task, -EIO); /* lost lock, terminate I/O */
+}
+
+static void ff_layout_write_call_done(struct rpc_task *task, void *data)
+{
+ struct nfs_pgio_header *hdr = data;
+
+ if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
+ task->tk_status == 0) {
+ nfs4_sequence_done(task, &hdr->res.seq_res);
+ return;
+ }
+
+ /* Note this may cause RPC to be resent */
+ hdr->mds_ops->rpc_call_done(task, hdr);
+}
+
+static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
+{
+ struct nfs_pgio_header *hdr = data;
+
+ rpc_count_iostats_metrics(task,
+ &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
+}
+
+static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
+{
+ rpc_call_start(task);
+}
+
+static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
+{
+ struct nfs_commit_data *wdata = data;
+
+ ff_layout_setup_sequence(wdata->ds_clp,
+ &wdata->args.seq_args,
+ &wdata->res.seq_res,
+ task);
+}
+
+static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
+{
+ struct nfs_commit_data *cdata = data;
+
+ rpc_count_iostats_metrics(task,
+ &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
+}
+
+static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
+ .rpc_call_prepare = ff_layout_read_prepare_v3,
+ .rpc_call_done = ff_layout_read_call_done,
+ .rpc_count_stats = ff_layout_read_count_stats,
+ .rpc_release = pnfs_generic_rw_release,
+};
+
+static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
+ .rpc_call_prepare = ff_layout_read_prepare_v4,
+ .rpc_call_done = ff_layout_read_call_done,
+ .rpc_count_stats = ff_layout_read_count_stats,
+ .rpc_release = pnfs_generic_rw_release,
+};
+
+static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
+ .rpc_call_prepare = ff_layout_write_prepare_v3,
+ .rpc_call_done = ff_layout_write_call_done,
+ .rpc_count_stats = ff_layout_write_count_stats,
+ .rpc_release = pnfs_generic_rw_release,
+};
+
+static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
+ .rpc_call_prepare = ff_layout_write_prepare_v4,
+ .rpc_call_done = ff_layout_write_call_done,
+ .rpc_count_stats = ff_layout_write_count_stats,
+ .rpc_release = pnfs_generic_rw_release,
+};
+
+static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
+ .rpc_call_prepare = ff_layout_commit_prepare_v3,
+ .rpc_call_done = pnfs_generic_write_commit_done,
+ .rpc_count_stats = ff_layout_commit_count_stats,
+ .rpc_release = pnfs_generic_commit_release,
+};
+
+static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
+ .rpc_call_prepare = ff_layout_commit_prepare_v4,
+ .rpc_call_done = pnfs_generic_write_commit_done,
+ .rpc_count_stats = ff_layout_commit_count_stats,
+ .rpc_release = pnfs_generic_commit_release,
+};
+
+static enum pnfs_try_status
+ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
+{
+ struct pnfs_layout_segment *lseg = hdr->lseg;
+ struct nfs4_pnfs_ds *ds;
+ struct rpc_clnt *ds_clnt;
+ struct rpc_cred *ds_cred;
+ loff_t offset = hdr->args.offset;
+ u32 idx = hdr->pgio_mirror_idx;
+ int vers;
+ struct nfs_fh *fh;
+
+ dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
+ __func__, hdr->inode->i_ino,
+ hdr->args.pgbase, (size_t)hdr->args.count, offset);
+
+ ds = nfs4_ff_layout_prepare_ds(lseg, idx, false);
+ if (!ds)
+ goto out_failed;
+
+ ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
+ hdr->inode);
+ if (IS_ERR(ds_clnt))
+ goto out_failed;
+
+ ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
+ if (IS_ERR(ds_cred))
+ goto out_failed;
+
+ vers = nfs4_ff_layout_ds_version(lseg, idx);
+
+ dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
+ ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count), vers);
+
+ atomic_inc(&ds->ds_clp->cl_count);
+ hdr->ds_clp = ds->ds_clp;
+ fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
+ if (fh)
+ hdr->args.fh = fh;
+
+ /*
+ * Note that if we ever decide to split across DSes,
+ * then we may need to handle dense-like offsets.
+ */
+ hdr->args.offset = offset;
+ hdr->mds_offset = offset;
+
+ /* Perform an asynchronous read to ds */
+ nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
+ vers == 3 ? &ff_layout_read_call_ops_v3 :
+ &ff_layout_read_call_ops_v4,
+ 0, RPC_TASK_SOFTCONN);
+
+ return PNFS_ATTEMPTED;
+
+out_failed:
+ if (ff_layout_has_available_ds(lseg))
+ return PNFS_TRY_AGAIN;
+ return PNFS_NOT_ATTEMPTED;
+}
+
+/* Perform async writes. */
+static enum pnfs_try_status
+ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
+{
+ struct pnfs_layout_segment *lseg = hdr->lseg;
+ struct nfs4_pnfs_ds *ds;
+ struct rpc_clnt *ds_clnt;
+ struct rpc_cred *ds_cred;
+ loff_t offset = hdr->args.offset;
+ int vers;
+ struct nfs_fh *fh;
+ int idx = hdr->pgio_mirror_idx;
+
+ ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
+ if (!ds)
+ return PNFS_NOT_ATTEMPTED;
+
+ ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
+ hdr->inode);
+ if (IS_ERR(ds_clnt))
+ return PNFS_NOT_ATTEMPTED;
+
+ ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
+ if (IS_ERR(ds_cred))
+ return PNFS_NOT_ATTEMPTED;
+
+ vers = nfs4_ff_layout_ds_version(lseg, idx);
+
+ dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d vers %d\n",
+ __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
+ offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count),
+ vers);
+
+ hdr->pgio_done_cb = ff_layout_write_done_cb;
+ atomic_inc(&ds->ds_clp->cl_count);
+ hdr->ds_clp = ds->ds_clp;
+ hdr->ds_commit_idx = idx;
+ fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
+ if (fh)
+ hdr->args.fh = fh;
+
+ /*
+ * Note that if we ever decide to split across DSes,
+ * then we may need to handle dense-like offsets.
+ */
+ hdr->args.offset = offset;
+
+ /* Perform an asynchronous write */
+ nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
+ vers == 3 ? &ff_layout_write_call_ops_v3 :
+ &ff_layout_write_call_ops_v4,
+ sync, RPC_TASK_SOFTCONN);
+ return PNFS_ATTEMPTED;
+}
+
+static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
+{
+ return i;
+}
+
+static struct nfs_fh *
+select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
+{
+ struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
+
+ /* FIXME: Assume that there is only one NFS version available
+ * for the DS.
+ */
+ return &flseg->mirror_array[i]->fh_versions[0];
+}
+
+static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
+{
+ struct pnfs_layout_segment *lseg = data->lseg;
+ struct nfs4_pnfs_ds *ds;
+ struct rpc_clnt *ds_clnt;
+ struct rpc_cred *ds_cred;
+ u32 idx;
+ int vers;
+ struct nfs_fh *fh;
+
+ idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
+ ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
+ if (!ds)
+ goto out_err;
+
+ ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
+ data->inode);
+ if (IS_ERR(ds_clnt))
+ goto out_err;
+
+ ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred);
+ if (IS_ERR(ds_cred))
+ goto out_err;
+
+ vers = nfs4_ff_layout_ds_version(lseg, idx);
+
+ dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
+ data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count),
+ vers);
+ data->commit_done_cb = ff_layout_commit_done_cb;
+ data->cred = ds_cred;
+ atomic_inc(&ds->ds_clp->cl_count);
+ data->ds_clp = ds->ds_clp;
+ fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
+ if (fh)
+ data->args.fh = fh;
+ return nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
+ vers == 3 ? &ff_layout_commit_call_ops_v3 :
+ &ff_layout_commit_call_ops_v4,
+ how, RPC_TASK_SOFTCONN);
+out_err:
+ pnfs_generic_prepare_to_resend_writes(data);
+ pnfs_generic_commit_release(data);
+ return -EAGAIN;
+}
+
+static int
+ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
+ int how, struct nfs_commit_info *cinfo)
+{
+ return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
+ ff_layout_initiate_commit);
+}
+
+static struct pnfs_ds_commit_info *
+ff_layout_get_ds_info(struct inode *inode)
+{
+ struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
+
+ if (layout == NULL)
+ return NULL;
+
+ return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
+}
+
+static void
+ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
+{
+ nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
+ id_node));
+}
+
+static int ff_layout_encode_ioerr(struct nfs4_flexfile_layout *flo,
+ struct xdr_stream *xdr,
+ const struct nfs4_layoutreturn_args *args)
+{
+ struct pnfs_layout_hdr *hdr = &flo->generic_hdr;
+ __be32 *start;
+ int count = 0, ret = 0;
+
+ start = xdr_reserve_space(xdr, 4);
+ if (unlikely(!start))
+ return -E2BIG;
+
+ /* This assume we always return _ALL_ layouts */
+ spin_lock(&hdr->plh_inode->i_lock);
+ ret = ff_layout_encode_ds_ioerr(flo, xdr, &count, &args->range);
+ spin_unlock(&hdr->plh_inode->i_lock);
+
+ *start = cpu_to_be32(count);
+
+ return ret;
+}
+
+/* report nothing for now */
+static void ff_layout_encode_iostats(struct nfs4_flexfile_layout *flo,
+ struct xdr_stream *xdr,
+ const struct nfs4_layoutreturn_args *args)
+{
+ __be32 *p;
+
+ p = xdr_reserve_space(xdr, 4);
+ if (likely(p))
+ *p = cpu_to_be32(0);
+}
+
+static struct nfs4_deviceid_node *
+ff_layout_alloc_deviceid_node(struct nfs_server *server,
+ struct pnfs_device *pdev, gfp_t gfp_flags)
+{
+ struct nfs4_ff_layout_ds *dsaddr;
+
+ dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
+ if (!dsaddr)
+ return NULL;
+ return &dsaddr->id_node;
+}
+
+static void
+ff_layout_encode_layoutreturn(struct pnfs_layout_hdr *lo,
+ struct xdr_stream *xdr,
+ const struct nfs4_layoutreturn_args *args)
+{
+ struct nfs4_flexfile_layout *flo = FF_LAYOUT_FROM_HDR(lo);
+ __be32 *start;
+
+ dprintk("%s: Begin\n", __func__);
+ start = xdr_reserve_space(xdr, 4);
+ BUG_ON(!start);
+
+ if (ff_layout_encode_ioerr(flo, xdr, args))
+ goto out;
+
+ ff_layout_encode_iostats(flo, xdr, args);
+out:
+ *start = cpu_to_be32((xdr->p - start - 1) * 4);
+ dprintk("%s: Return\n", __func__);
+}
+
+static struct pnfs_layoutdriver_type flexfilelayout_type = {
+ .id = LAYOUT_FLEX_FILES,
+ .name = "LAYOUT_FLEX_FILES",
+ .owner = THIS_MODULE,
+ .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
+ .free_layout_hdr = ff_layout_free_layout_hdr,
+ .alloc_lseg = ff_layout_alloc_lseg,
+ .free_lseg = ff_layout_free_lseg,
+ .pg_read_ops = &ff_layout_pg_read_ops,
+ .pg_write_ops = &ff_layout_pg_write_ops,
+ .get_ds_info = ff_layout_get_ds_info,
+ .free_deviceid_node = ff_layout_free_deviceid_node,
+ .mark_request_commit = pnfs_layout_mark_request_commit,
+ .clear_request_commit = pnfs_generic_clear_request_commit,
+ .scan_commit_lists = pnfs_generic_scan_commit_lists,
+ .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
+ .commit_pagelist = ff_layout_commit_pagelist,
+ .read_pagelist = ff_layout_read_pagelist,
+ .write_pagelist = ff_layout_write_pagelist,
+ .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
+ .encode_layoutreturn = ff_layout_encode_layoutreturn,
+ .sync = pnfs_nfs_generic_sync,
+};
+
+static int __init nfs4flexfilelayout_init(void)
+{
+ printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
+ __func__);
+ return pnfs_register_layoutdriver(&flexfilelayout_type);
+}
+
+static void __exit nfs4flexfilelayout_exit(void)
+{
+ printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
+ __func__);
+ pnfs_unregister_layoutdriver(&flexfilelayout_type);
+}
+
+MODULE_ALIAS("nfs-layouttype4-4");
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
+
+module_init(nfs4flexfilelayout_init);
+module_exit(nfs4flexfilelayout_exit);
diff --git a/fs/nfs/flexfilelayout/flexfilelayout.h b/fs/nfs/flexfilelayout/flexfilelayout.h
new file mode 100644
index 000000000..070f20445
--- /dev/null
+++ b/fs/nfs/flexfilelayout/flexfilelayout.h
@@ -0,0 +1,155 @@
+/*
+ * NFSv4 flexfile layout driver data structures.
+ *
+ * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
+ *
+ * Tao Peng <bergwolf@primarydata.com>
+ */
+
+#ifndef FS_NFS_NFS4FLEXFILELAYOUT_H
+#define FS_NFS_NFS4FLEXFILELAYOUT_H
+
+#include "../pnfs.h"
+
+/* XXX: Let's filter out insanely large mirror count for now to avoid oom
+ * due to network error etc. */
+#define NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT 4096
+
+struct nfs4_ff_ds_version {
+ u32 version;
+ u32 minor_version;
+ u32 rsize;
+ u32 wsize;
+ bool tightly_coupled;
+};
+
+/* chained in global deviceid hlist */
+struct nfs4_ff_layout_ds {
+ struct nfs4_deviceid_node id_node;
+ u32 ds_versions_cnt;
+ struct nfs4_ff_ds_version *ds_versions;
+ struct nfs4_pnfs_ds *ds;
+};
+
+struct nfs4_ff_layout_ds_err {
+ struct list_head list; /* linked in mirror error_list */
+ u64 offset;
+ u64 length;
+ int status;
+ enum nfs_opnum4 opnum;
+ nfs4_stateid stateid;
+ struct nfs4_deviceid deviceid;
+};
+
+struct nfs4_ff_layout_mirror {
+ u32 ds_count;
+ u32 efficiency;
+ struct nfs4_ff_layout_ds *mirror_ds;
+ u32 fh_versions_cnt;
+ struct nfs_fh *fh_versions;
+ nfs4_stateid stateid;
+ struct nfs4_string user_name;
+ struct nfs4_string group_name;
+ u32 uid;
+ u32 gid;
+ struct rpc_cred *cred;
+ spinlock_t lock;
+};
+
+struct nfs4_ff_layout_segment {
+ struct pnfs_layout_segment generic_hdr;
+ u64 stripe_unit;
+ u32 mirror_array_cnt;
+ struct nfs4_ff_layout_mirror **mirror_array;
+};
+
+struct nfs4_flexfile_layout {
+ struct pnfs_layout_hdr generic_hdr;
+ struct pnfs_ds_commit_info commit_info;
+ struct list_head error_list; /* nfs4_ff_layout_ds_err */
+};
+
+static inline struct nfs4_flexfile_layout *
+FF_LAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo)
+{
+ return container_of(lo, struct nfs4_flexfile_layout, generic_hdr);
+}
+
+static inline struct nfs4_ff_layout_segment *
+FF_LAYOUT_LSEG(struct pnfs_layout_segment *lseg)
+{
+ return container_of(lseg,
+ struct nfs4_ff_layout_segment,
+ generic_hdr);
+}
+
+static inline struct nfs4_deviceid_node *
+FF_LAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg, u32 idx)
+{
+ if (idx >= FF_LAYOUT_LSEG(lseg)->mirror_array_cnt ||
+ FF_LAYOUT_LSEG(lseg)->mirror_array[idx] == NULL ||
+ FF_LAYOUT_LSEG(lseg)->mirror_array[idx]->mirror_ds == NULL)
+ return NULL;
+ return &FF_LAYOUT_LSEG(lseg)->mirror_array[idx]->mirror_ds->id_node;
+}
+
+static inline struct nfs4_ff_layout_ds *
+FF_LAYOUT_MIRROR_DS(struct nfs4_deviceid_node *node)
+{
+ return container_of(node, struct nfs4_ff_layout_ds, id_node);
+}
+
+static inline struct nfs4_ff_layout_mirror *
+FF_LAYOUT_COMP(struct pnfs_layout_segment *lseg, u32 idx)
+{
+ if (idx >= FF_LAYOUT_LSEG(lseg)->mirror_array_cnt)
+ return NULL;
+ return FF_LAYOUT_LSEG(lseg)->mirror_array[idx];
+}
+
+static inline u32
+FF_LAYOUT_MIRROR_COUNT(struct pnfs_layout_segment *lseg)
+{
+ return FF_LAYOUT_LSEG(lseg)->mirror_array_cnt;
+}
+
+static inline bool
+ff_layout_test_devid_unavailable(struct nfs4_deviceid_node *node)
+{
+ return nfs4_test_deviceid_unavailable(node);
+}
+
+static inline int
+nfs4_ff_layout_ds_version(struct pnfs_layout_segment *lseg, u32 ds_idx)
+{
+ return FF_LAYOUT_COMP(lseg, ds_idx)->mirror_ds->ds_versions[0].version;
+}
+
+struct nfs4_ff_layout_ds *
+nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
+ gfp_t gfp_flags);
+void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds);
+void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds);
+int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
+ struct nfs4_ff_layout_mirror *mirror, u64 offset,
+ u64 length, int status, enum nfs_opnum4 opnum,
+ gfp_t gfp_flags);
+int ff_layout_encode_ds_ioerr(struct nfs4_flexfile_layout *flo,
+ struct xdr_stream *xdr, int *count,
+ const struct pnfs_layout_range *range);
+struct nfs_fh *
+nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx);
+
+struct nfs4_pnfs_ds *
+nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx,
+ bool fail_return);
+
+struct rpc_clnt *
+nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg,
+ u32 ds_idx,
+ struct nfs_client *ds_clp,
+ struct inode *inode);
+struct rpc_cred *ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg,
+ u32 ds_idx, struct rpc_cred *mdscred);
+bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg);
+#endif /* FS_NFS_NFS4FLEXFILELAYOUT_H */
diff --git a/fs/nfs/flexfilelayout/flexfilelayoutdev.c b/fs/nfs/flexfilelayout/flexfilelayoutdev.c
new file mode 100644
index 000000000..f13e1969e
--- /dev/null
+++ b/fs/nfs/flexfilelayout/flexfilelayoutdev.c
@@ -0,0 +1,553 @@
+/*
+ * Device operations for the pnfs nfs4 file layout driver.
+ *
+ * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
+ *
+ * Tao Peng <bergwolf@primarydata.com>
+ */
+
+#include <linux/nfs_fs.h>
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <linux/sunrpc/addr.h>
+
+#include "../internal.h"
+#include "../nfs4session.h"
+#include "flexfilelayout.h"
+
+#define NFSDBG_FACILITY NFSDBG_PNFS_LD
+
+static unsigned int dataserver_timeo = NFS4_DEF_DS_TIMEO;
+static unsigned int dataserver_retrans = NFS4_DEF_DS_RETRANS;
+
+void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds)
+{
+ if (mirror_ds)
+ nfs4_put_deviceid_node(&mirror_ds->id_node);
+}
+
+void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds)
+{
+ nfs4_print_deviceid(&mirror_ds->id_node.deviceid);
+ nfs4_pnfs_ds_put(mirror_ds->ds);
+ kfree_rcu(mirror_ds, id_node.rcu);
+}
+
+/* Decode opaque device data and construct new_ds using it */
+struct nfs4_ff_layout_ds *
+nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
+ gfp_t gfp_flags)
+{
+ struct xdr_stream stream;
+ struct xdr_buf buf;
+ struct page *scratch;
+ struct list_head dsaddrs;
+ struct nfs4_pnfs_ds_addr *da;
+ struct nfs4_ff_layout_ds *new_ds = NULL;
+ struct nfs4_ff_ds_version *ds_versions = NULL;
+ u32 mp_count;
+ u32 version_count;
+ __be32 *p;
+ int i, ret = -ENOMEM;
+
+ /* set up xdr stream */
+ scratch = alloc_page(gfp_flags);
+ if (!scratch)
+ goto out_err;
+
+ new_ds = kzalloc(sizeof(struct nfs4_ff_layout_ds), gfp_flags);
+ if (!new_ds)
+ goto out_scratch;
+
+ nfs4_init_deviceid_node(&new_ds->id_node,
+ server,
+ &pdev->dev_id);
+ INIT_LIST_HEAD(&dsaddrs);
+
+ xdr_init_decode_pages(&stream, &buf, pdev->pages, pdev->pglen);
+ xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
+
+ /* multipath count */
+ p = xdr_inline_decode(&stream, 4);
+ if (unlikely(!p))
+ goto out_err_drain_dsaddrs;
+ mp_count = be32_to_cpup(p);
+ dprintk("%s: multipath ds count %d\n", __func__, mp_count);
+
+ for (i = 0; i < mp_count; i++) {
+ /* multipath ds */
+ da = nfs4_decode_mp_ds_addr(server->nfs_client->cl_net,
+ &stream, gfp_flags);
+ if (da)
+ list_add_tail(&da->da_node, &dsaddrs);
+ }
+ if (list_empty(&dsaddrs)) {
+ dprintk("%s: no suitable DS addresses found\n",
+ __func__);
+ ret = -ENOMEDIUM;
+ goto out_err_drain_dsaddrs;
+ }
+
+ /* version count */
+ p = xdr_inline_decode(&stream, 4);
+ if (unlikely(!p))
+ goto out_err_drain_dsaddrs;
+ version_count = be32_to_cpup(p);
+ dprintk("%s: version count %d\n", __func__, version_count);
+
+ ds_versions = kzalloc(version_count * sizeof(struct nfs4_ff_ds_version),
+ gfp_flags);
+ if (!ds_versions)
+ goto out_scratch;
+
+ for (i = 0; i < version_count; i++) {
+ /* 20 = version(4) + minor_version(4) + rsize(4) + wsize(4) +
+ * tightly_coupled(4) */
+ p = xdr_inline_decode(&stream, 20);
+ if (unlikely(!p))
+ goto out_err_drain_dsaddrs;
+ ds_versions[i].version = be32_to_cpup(p++);
+ ds_versions[i].minor_version = be32_to_cpup(p++);
+ ds_versions[i].rsize = nfs_block_size(be32_to_cpup(p++), NULL);
+ ds_versions[i].wsize = nfs_block_size(be32_to_cpup(p++), NULL);
+ ds_versions[i].tightly_coupled = be32_to_cpup(p);
+
+ if (ds_versions[i].rsize > NFS_MAX_FILE_IO_SIZE)
+ ds_versions[i].rsize = NFS_MAX_FILE_IO_SIZE;
+ if (ds_versions[i].wsize > NFS_MAX_FILE_IO_SIZE)
+ ds_versions[i].wsize = NFS_MAX_FILE_IO_SIZE;
+
+ if (ds_versions[i].version != 3 || ds_versions[i].minor_version != 0) {
+ dprintk("%s: [%d] unsupported ds version %d-%d\n", __func__,
+ i, ds_versions[i].version,
+ ds_versions[i].minor_version);
+ ret = -EPROTONOSUPPORT;
+ goto out_err_drain_dsaddrs;
+ }
+
+ dprintk("%s: [%d] vers %u minor_ver %u rsize %u wsize %u coupled %d\n",
+ __func__, i, ds_versions[i].version,
+ ds_versions[i].minor_version,
+ ds_versions[i].rsize,
+ ds_versions[i].wsize,
+ ds_versions[i].tightly_coupled);
+ }
+
+ new_ds->ds_versions = ds_versions;
+ new_ds->ds_versions_cnt = version_count;
+
+ new_ds->ds = nfs4_pnfs_ds_add(&dsaddrs, gfp_flags);
+ if (!new_ds->ds)
+ goto out_err_drain_dsaddrs;
+
+ /* If DS was already in cache, free ds addrs */
+ while (!list_empty(&dsaddrs)) {
+ da = list_first_entry(&dsaddrs,
+ struct nfs4_pnfs_ds_addr,
+ da_node);
+ list_del_init(&da->da_node);
+ kfree(da->da_remotestr);
+ kfree(da);
+ }
+
+ __free_page(scratch);
+ return new_ds;
+
+out_err_drain_dsaddrs:
+ while (!list_empty(&dsaddrs)) {
+ da = list_first_entry(&dsaddrs, struct nfs4_pnfs_ds_addr,
+ da_node);
+ list_del_init(&da->da_node);
+ kfree(da->da_remotestr);
+ kfree(da);
+ }
+
+ kfree(ds_versions);
+out_scratch:
+ __free_page(scratch);
+out_err:
+ kfree(new_ds);
+
+ dprintk("%s ERROR: returning %d\n", __func__, ret);
+ return NULL;
+}
+
+static u64
+end_offset(u64 start, u64 len)
+{
+ u64 end;
+
+ end = start + len;
+ return end >= start ? end : NFS4_MAX_UINT64;
+}
+
+static void extend_ds_error(struct nfs4_ff_layout_ds_err *err,
+ u64 offset, u64 length)
+{
+ u64 end;
+
+ end = max_t(u64, end_offset(err->offset, err->length),
+ end_offset(offset, length));
+ err->offset = min_t(u64, err->offset, offset);
+ err->length = end - err->offset;
+}
+
+static bool ds_error_can_merge(struct nfs4_ff_layout_ds_err *err, u64 offset,
+ u64 length, int status, enum nfs_opnum4 opnum,
+ nfs4_stateid *stateid,
+ struct nfs4_deviceid *deviceid)
+{
+ return err->status == status && err->opnum == opnum &&
+ nfs4_stateid_match(&err->stateid, stateid) &&
+ !memcmp(&err->deviceid, deviceid, sizeof(*deviceid)) &&
+ end_offset(err->offset, err->length) >= offset &&
+ err->offset <= end_offset(offset, length);
+}
+
+static bool merge_ds_error(struct nfs4_ff_layout_ds_err *old,
+ struct nfs4_ff_layout_ds_err *new)
+{
+ if (!ds_error_can_merge(old, new->offset, new->length, new->status,
+ new->opnum, &new->stateid, &new->deviceid))
+ return false;
+
+ extend_ds_error(old, new->offset, new->length);
+ return true;
+}
+
+static bool
+ff_layout_add_ds_error_locked(struct nfs4_flexfile_layout *flo,
+ struct nfs4_ff_layout_ds_err *dserr)
+{
+ struct nfs4_ff_layout_ds_err *err;
+
+ list_for_each_entry(err, &flo->error_list, list) {
+ if (merge_ds_error(err, dserr)) {
+ return true;
+ }
+ }
+
+ list_add(&dserr->list, &flo->error_list);
+ return false;
+}
+
+static bool
+ff_layout_update_ds_error(struct nfs4_flexfile_layout *flo, u64 offset,
+ u64 length, int status, enum nfs_opnum4 opnum,
+ nfs4_stateid *stateid, struct nfs4_deviceid *deviceid)
+{
+ bool found = false;
+ struct nfs4_ff_layout_ds_err *err;
+
+ list_for_each_entry(err, &flo->error_list, list) {
+ if (ds_error_can_merge(err, offset, length, status, opnum,
+ stateid, deviceid)) {
+ found = true;
+ extend_ds_error(err, offset, length);
+ break;
+ }
+ }
+
+ return found;
+}
+
+int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
+ struct nfs4_ff_layout_mirror *mirror, u64 offset,
+ u64 length, int status, enum nfs_opnum4 opnum,
+ gfp_t gfp_flags)
+{
+ struct nfs4_ff_layout_ds_err *dserr;
+ bool needfree;
+
+ if (status == 0)
+ return 0;
+
+ if (mirror->mirror_ds == NULL)
+ return -EINVAL;
+
+ spin_lock(&flo->generic_hdr.plh_inode->i_lock);
+ if (ff_layout_update_ds_error(flo, offset, length, status, opnum,
+ &mirror->stateid,
+ &mirror->mirror_ds->id_node.deviceid)) {
+ spin_unlock(&flo->generic_hdr.plh_inode->i_lock);
+ return 0;
+ }
+ spin_unlock(&flo->generic_hdr.plh_inode->i_lock);
+ dserr = kmalloc(sizeof(*dserr), gfp_flags);
+ if (!dserr)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&dserr->list);
+ dserr->offset = offset;
+ dserr->length = length;
+ dserr->status = status;
+ dserr->opnum = opnum;
+ nfs4_stateid_copy(&dserr->stateid, &mirror->stateid);
+ memcpy(&dserr->deviceid, &mirror->mirror_ds->id_node.deviceid,
+ NFS4_DEVICEID4_SIZE);
+
+ spin_lock(&flo->generic_hdr.plh_inode->i_lock);
+ needfree = ff_layout_add_ds_error_locked(flo, dserr);
+ spin_unlock(&flo->generic_hdr.plh_inode->i_lock);
+ if (needfree)
+ kfree(dserr);
+
+ return 0;
+}
+
+/* currently we only support AUTH_NONE and AUTH_SYS */
+static rpc_authflavor_t
+nfs4_ff_layout_choose_authflavor(struct nfs4_ff_layout_mirror *mirror)
+{
+ if (mirror->uid == (u32)-1)
+ return RPC_AUTH_NULL;
+ return RPC_AUTH_UNIX;
+}
+
+/* fetch cred for NFSv3 DS */
+static int ff_layout_update_mirror_cred(struct nfs4_ff_layout_mirror *mirror,
+ struct nfs4_pnfs_ds *ds)
+{
+ if (ds->ds_clp && !mirror->cred &&
+ mirror->mirror_ds->ds_versions[0].version == 3) {
+ struct rpc_auth *auth = ds->ds_clp->cl_rpcclient->cl_auth;
+ struct rpc_cred *cred;
+ struct auth_cred acred = {
+ .uid = make_kuid(&init_user_ns, mirror->uid),
+ .gid = make_kgid(&init_user_ns, mirror->gid),
+ };
+
+ /* AUTH_NULL ignores acred */
+ cred = auth->au_ops->lookup_cred(auth, &acred, 0);
+ if (IS_ERR(cred)) {
+ dprintk("%s: lookup_cred failed with %ld\n",
+ __func__, PTR_ERR(cred));
+ return PTR_ERR(cred);
+ } else {
+ if (cmpxchg(&mirror->cred, NULL, cred))
+ put_rpccred(cred);
+ }
+ }
+ return 0;
+}
+
+struct nfs_fh *
+nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx)
+{
+ struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, mirror_idx);
+ struct nfs_fh *fh = NULL;
+ struct nfs4_deviceid_node *devid;
+
+ if (mirror == NULL || mirror->mirror_ds == NULL ||
+ mirror->mirror_ds->ds == NULL) {
+ printk(KERN_ERR "NFS: %s: No data server for mirror offset index %d\n",
+ __func__, mirror_idx);
+ if (mirror && mirror->mirror_ds) {
+ devid = &mirror->mirror_ds->id_node;
+ pnfs_generic_mark_devid_invalid(devid);
+ }
+ goto out;
+ }
+
+ /* FIXME: For now assume there is only 1 version available for the DS */
+ fh = &mirror->fh_versions[0];
+out:
+ return fh;
+}
+
+/* Upon return, either ds is connected, or ds is NULL */
+struct nfs4_pnfs_ds *
+nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx,
+ bool fail_return)
+{
+ struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
+ struct nfs4_pnfs_ds *ds = NULL;
+ struct nfs4_deviceid_node *devid;
+ struct inode *ino = lseg->pls_layout->plh_inode;
+ struct nfs_server *s = NFS_SERVER(ino);
+ unsigned int max_payload;
+ rpc_authflavor_t flavor;
+
+ if (mirror == NULL || mirror->mirror_ds == NULL ||
+ mirror->mirror_ds->ds == NULL) {
+ printk(KERN_ERR "NFS: %s: No data server for offset index %d\n",
+ __func__, ds_idx);
+ if (mirror && mirror->mirror_ds) {
+ devid = &mirror->mirror_ds->id_node;
+ pnfs_generic_mark_devid_invalid(devid);
+ }
+ goto out;
+ }
+
+ devid = &mirror->mirror_ds->id_node;
+ if (ff_layout_test_devid_unavailable(devid))
+ goto out;
+
+ ds = mirror->mirror_ds->ds;
+ /* matching smp_wmb() in _nfs4_pnfs_v3/4_ds_connect */
+ smp_rmb();
+ if (ds->ds_clp)
+ goto out_update_creds;
+
+ flavor = nfs4_ff_layout_choose_authflavor(mirror);
+
+ /* FIXME: For now we assume the server sent only one version of NFS
+ * to use for the DS.
+ */
+ nfs4_pnfs_ds_connect(s, ds, devid, dataserver_timeo,
+ dataserver_retrans,
+ mirror->mirror_ds->ds_versions[0].version,
+ mirror->mirror_ds->ds_versions[0].minor_version,
+ flavor);
+
+ /* connect success, check rsize/wsize limit */
+ if (ds->ds_clp) {
+ max_payload =
+ nfs_block_size(rpc_max_payload(ds->ds_clp->cl_rpcclient),
+ NULL);
+ if (mirror->mirror_ds->ds_versions[0].rsize > max_payload)
+ mirror->mirror_ds->ds_versions[0].rsize = max_payload;
+ if (mirror->mirror_ds->ds_versions[0].wsize > max_payload)
+ mirror->mirror_ds->ds_versions[0].wsize = max_payload;
+ } else {
+ ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
+ mirror, lseg->pls_range.offset,
+ lseg->pls_range.length, NFS4ERR_NXIO,
+ OP_ILLEGAL, GFP_NOIO);
+ if (fail_return) {
+ pnfs_error_mark_layout_for_return(ino, lseg);
+ if (ff_layout_has_available_ds(lseg))
+ pnfs_set_retry_layoutget(lseg->pls_layout);
+ else
+ pnfs_clear_retry_layoutget(lseg->pls_layout);
+
+ } else {
+ if (ff_layout_has_available_ds(lseg))
+ set_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
+ &lseg->pls_layout->plh_flags);
+ else {
+ pnfs_error_mark_layout_for_return(ino, lseg);
+ pnfs_clear_retry_layoutget(lseg->pls_layout);
+ }
+ }
+ }
+out_update_creds:
+ if (ff_layout_update_mirror_cred(mirror, ds))
+ ds = NULL;
+out:
+ return ds;
+}
+
+struct rpc_cred *
+ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg, u32 ds_idx,
+ struct rpc_cred *mdscred)
+{
+ struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
+ struct rpc_cred *cred = ERR_PTR(-EINVAL);
+
+ if (!nfs4_ff_layout_prepare_ds(lseg, ds_idx, true))
+ goto out;
+
+ if (mirror && mirror->cred)
+ cred = mirror->cred;
+ else
+ cred = mdscred;
+out:
+ return cred;
+}
+
+/**
+* Find or create a DS rpc client with th MDS server rpc client auth flavor
+* in the nfs_client cl_ds_clients list.
+*/
+struct rpc_clnt *
+nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg, u32 ds_idx,
+ struct nfs_client *ds_clp, struct inode *inode)
+{
+ struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
+
+ switch (mirror->mirror_ds->ds_versions[0].version) {
+ case 3:
+ /* For NFSv3 DS, flavor is set when creating DS connections */
+ return ds_clp->cl_rpcclient;
+ case 4:
+ return nfs4_find_or_create_ds_client(ds_clp, inode);
+ default:
+ BUG();
+ }
+}
+
+static bool is_range_intersecting(u64 offset1, u64 length1,
+ u64 offset2, u64 length2)
+{
+ u64 end1 = end_offset(offset1, length1);
+ u64 end2 = end_offset(offset2, length2);
+
+ return (end1 == NFS4_MAX_UINT64 || end1 > offset2) &&
+ (end2 == NFS4_MAX_UINT64 || end2 > offset1);
+}
+
+/* called with inode i_lock held */
+int ff_layout_encode_ds_ioerr(struct nfs4_flexfile_layout *flo,
+ struct xdr_stream *xdr, int *count,
+ const struct pnfs_layout_range *range)
+{
+ struct nfs4_ff_layout_ds_err *err, *n;
+ __be32 *p;
+
+ list_for_each_entry_safe(err, n, &flo->error_list, list) {
+ if (!is_range_intersecting(err->offset, err->length,
+ range->offset, range->length))
+ continue;
+ /* offset(8) + length(8) + stateid(NFS4_STATEID_SIZE)
+ * + deviceid(NFS4_DEVICEID4_SIZE) + status(4) + opnum(4)
+ */
+ p = xdr_reserve_space(xdr,
+ 24 + NFS4_STATEID_SIZE + NFS4_DEVICEID4_SIZE);
+ if (unlikely(!p))
+ return -ENOBUFS;
+ p = xdr_encode_hyper(p, err->offset);
+ p = xdr_encode_hyper(p, err->length);
+ p = xdr_encode_opaque_fixed(p, &err->stateid,
+ NFS4_STATEID_SIZE);
+ p = xdr_encode_opaque_fixed(p, &err->deviceid,
+ NFS4_DEVICEID4_SIZE);
+ *p++ = cpu_to_be32(err->status);
+ *p++ = cpu_to_be32(err->opnum);
+ *count += 1;
+ list_del(&err->list);
+ dprintk("%s: offset %llu length %llu status %d op %d count %d\n",
+ __func__, err->offset, err->length, err->status,
+ err->opnum, *count);
+ kfree(err);
+ }
+
+ return 0;
+}
+
+bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg)
+{
+ struct nfs4_ff_layout_mirror *mirror;
+ struct nfs4_deviceid_node *devid;
+ int idx;
+
+ for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) {
+ mirror = FF_LAYOUT_COMP(lseg, idx);
+ if (mirror && mirror->mirror_ds) {
+ devid = &mirror->mirror_ds->id_node;
+ if (!ff_layout_test_devid_unavailable(devid))
+ return true;
+ }
+ }
+
+ return false;
+}
+
+module_param(dataserver_retrans, uint, 0644);
+MODULE_PARM_DESC(dataserver_retrans, "The number of times the NFSv4.1 client "
+ "retries a request before it attempts further "
+ " recovery action.");
+module_param(dataserver_timeo, uint, 0644);
+MODULE_PARM_DESC(dataserver_timeo, "The time (in tenths of a second) the "
+ "NFSv4.1 client waits for a response from a "
+ " data server before it retries an NFS request.");
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-17 08:59:19 +0000