nfs/flexfilelayout/flexfilelayout.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Module for pnfs flexfile layout driver.
0004  *
0005  * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
0006  *
0007  * Tao Peng <bergwolf@primarydata.com>
0008  */
0009
0010 #include <linux/nfs_fs.h>
0011 #include <linux/nfs_mount.h>
0012 #include <linux/nfs_page.h>
0013 #include <linux/module.h>
0014 #include <linux/sched/mm.h>
0015
0016 #include <linux/sunrpc/metrics.h>
0017
0018 #include "flexfilelayout.h"
0019 #include "../nfs4session.h"
0020 #include "../nfs4idmap.h"
0021 #include "../internal.h"
0022 #include "../delegation.h"
0023 #include "../nfs4trace.h"
0024 #include "../iostat.h"
0025 #include "../nfs.h"
0026 #include "../nfs42.h"
0027
0028 #define NFSDBG_FACILITY         NFSDBG_PNFS_LD
0029
0030 #define FF_LAYOUT_POLL_RETRY_MAX     (15*HZ)
0031 #define FF_LAYOUTRETURN_MAXERR 20
0032
0033 static unsigned short io_maxretrans;
0034
0035 static const struct pnfs_commit_ops ff_layout_commit_ops;
0036 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
0037         struct nfs_pgio_header *hdr);
0038 static int ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
0039                    struct nfs42_layoutstat_devinfo *devinfo,
0040                    int dev_limit);
0041 static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
0042                   const struct nfs42_layoutstat_devinfo *devinfo,
0043                   struct nfs4_ff_layout_mirror *mirror);
0044
0045 static struct pnfs_layout_hdr *
0046 ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
0047 {
0048     struct nfs4_flexfile_layout *ffl;
0049
0050     ffl = kzalloc(sizeof(*ffl), gfp_flags);
0051     if (ffl) {
0052         pnfs_init_ds_commit_info(&ffl->commit_info);
0053         INIT_LIST_HEAD(&ffl->error_list);
0054         INIT_LIST_HEAD(&ffl->mirrors);
0055         ffl->last_report_time = ktime_get();
0056         ffl->commit_info.ops = &ff_layout_commit_ops;
0057         return &ffl->generic_hdr;
0058     } else
0059         return NULL;
0060 }
0061
0062 static void
0063 ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
0064 {
0065     struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(lo);
0066     struct nfs4_ff_layout_ds_err *err, *n;
0067
0068     list_for_each_entry_safe(err, n, &ffl->error_list, list) {
0069         list_del(&err->list);
0070         kfree(err);
0071     }
0072     kfree_rcu(ffl, generic_hdr.plh_rcu);
0073 }
0074
0075 static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
0076 {
0077     __be32 *p;
0078
0079     p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
0080     if (unlikely(p == NULL))
0081         return -ENOBUFS;
0082     stateid->type = NFS4_PNFS_DS_STATEID_TYPE;
0083     memcpy(stateid->data, p, NFS4_STATEID_SIZE);
0084     dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
0085         p[0], p[1], p[2], p[3]);
0086     return 0;
0087 }
0088
0089 static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
0090 {
0091     __be32 *p;
0092
0093     p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
0094     if (unlikely(!p))
0095         return -ENOBUFS;
0096     memcpy(devid, p, NFS4_DEVICEID4_SIZE);
0097     nfs4_print_deviceid(devid);
0098     return 0;
0099 }
0100
0101 static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
0102 {
0103     __be32 *p;
0104
0105     p = xdr_inline_decode(xdr, 4);
0106     if (unlikely(!p))
0107         return -ENOBUFS;
0108     fh->size = be32_to_cpup(p++);
0109     if (fh->size > NFS_MAXFHSIZE) {
0110         printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
0111                fh->size);
0112         return -EOVERFLOW;
0113     }
0114     /* fh.data */
0115     p = xdr_inline_decode(xdr, fh->size);
0116     if (unlikely(!p))
0117         return -ENOBUFS;
0118     memcpy(&fh->data, p, fh->size);
0119     dprintk("%s: fh len %d\n", __func__, fh->size);
0120
0121     return 0;
0122 }
0123
0124 /*
0125  * Currently only stringified uids and gids are accepted.
0126  * I.e., kerberos is not supported to the DSes, so no pricipals.
0127  *
0128  * That means that one common function will suffice, but when
0129  * principals are added, this should be split to accomodate
0130  * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
0131  */
0132 static int
0133 decode_name(struct xdr_stream *xdr, u32 *id)
0134 {
0135     __be32 *p;
0136     int len;
0137
0138     /* opaque_length(4)*/
0139     p = xdr_inline_decode(xdr, 4);
0140     if (unlikely(!p))
0141         return -ENOBUFS;
0142     len = be32_to_cpup(p++);
0143     if (len < 0)
0144         return -EINVAL;
0145
0146     dprintk("%s: len %u\n", __func__, len);
0147
0148     /* opaque body */
0149     p = xdr_inline_decode(xdr, len);
0150     if (unlikely(!p))
0151         return -ENOBUFS;
0152
0153     if (!nfs_map_string_to_numeric((char *)p, len, id))
0154         return -EINVAL;
0155
0156     return 0;
0157 }
0158
0159 static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1,
0160         const struct nfs4_ff_layout_mirror *m2)
0161 {
0162     int i, j;
0163
0164     if (m1->fh_versions_cnt != m2->fh_versions_cnt)
0165         return false;
0166     for (i = 0; i < m1->fh_versions_cnt; i++) {
0167         bool found_fh = false;
0168         for (j = 0; j < m2->fh_versions_cnt; j++) {
0169             if (nfs_compare_fh(&m1->fh_versions[i],
0170                     &m2->fh_versions[j]) == 0) {
0171                 found_fh = true;
0172                 break;
0173             }
0174         }
0175         if (!found_fh)
0176             return false;
0177     }
0178     return true;
0179 }
0180
0181 static struct nfs4_ff_layout_mirror *
0182 ff_layout_add_mirror(struct pnfs_layout_hdr *lo,
0183         struct nfs4_ff_layout_mirror *mirror)
0184 {
0185     struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
0186     struct nfs4_ff_layout_mirror *pos;
0187     struct inode *inode = lo->plh_inode;
0188
0189     spin_lock(&inode->i_lock);
0190     list_for_each_entry(pos, &ff_layout->mirrors, mirrors) {
0191         if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0)
0192             continue;
0193         if (!ff_mirror_match_fh(mirror, pos))
0194             continue;
0195         if (refcount_inc_not_zero(&pos->ref)) {
0196             spin_unlock(&inode->i_lock);
0197             return pos;
0198         }
0199     }
0200     list_add(&mirror->mirrors, &ff_layout->mirrors);
0201     mirror->layout = lo;
0202     spin_unlock(&inode->i_lock);
0203     return mirror;
0204 }
0205
0206 static void
0207 ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror)
0208 {
0209     struct inode *inode;
0210     if (mirror->layout == NULL)
0211         return;
0212     inode = mirror->layout->plh_inode;
0213     spin_lock(&inode->i_lock);
0214     list_del(&mirror->mirrors);
0215     spin_unlock(&inode->i_lock);
0216     mirror->layout = NULL;
0217 }
0218
0219 static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
0220 {
0221     struct nfs4_ff_layout_mirror *mirror;
0222
0223     mirror = kzalloc(sizeof(*mirror), gfp_flags);
0224     if (mirror != NULL) {
0225         spin_lock_init(&mirror->lock);
0226         refcount_set(&mirror->ref, 1);
0227         INIT_LIST_HEAD(&mirror->mirrors);
0228     }
0229     return mirror;
0230 }
0231
0232 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
0233 {
0234     const struct cred   *cred;
0235
0236     ff_layout_remove_mirror(mirror);
0237     kfree(mirror->fh_versions);
0238     cred = rcu_access_pointer(mirror->ro_cred);
0239     put_cred(cred);
0240     cred = rcu_access_pointer(mirror->rw_cred);
0241     put_cred(cred);
0242     nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
0243     kfree(mirror);
0244 }
0245
0246 static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror)
0247 {
0248     if (mirror != NULL && refcount_dec_and_test(&mirror->ref))
0249         ff_layout_free_mirror(mirror);
0250 }
0251
0252 static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
0253 {
0254     u32 i;
0255
0256     for (i = 0; i < fls->mirror_array_cnt; i++)
0257         ff_layout_put_mirror(fls->mirror_array[i]);
0258 }
0259
0260 static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
0261 {
0262     if (fls) {
0263         ff_layout_free_mirror_array(fls);
0264         kfree(fls);
0265     }
0266 }
0267
0268 static bool
0269 ff_lseg_match_mirrors(struct pnfs_layout_segment *l1,
0270         struct pnfs_layout_segment *l2)
0271 {
0272     const struct nfs4_ff_layout_segment *fl1 = FF_LAYOUT_LSEG(l1);
0273     const struct nfs4_ff_layout_segment *fl2 = FF_LAYOUT_LSEG(l1);
0274     u32 i;
0275
0276     if (fl1->mirror_array_cnt != fl2->mirror_array_cnt)
0277         return false;
0278     for (i = 0; i < fl1->mirror_array_cnt; i++) {
0279         if (fl1->mirror_array[i] != fl2->mirror_array[i])
0280             return false;
0281     }
0282     return true;
0283 }
0284
0285 static bool
0286 ff_lseg_range_is_after(const struct pnfs_layout_range *l1,
0287         const struct pnfs_layout_range *l2)
0288 {
0289     u64 end1, end2;
0290
0291     if (l1->iomode != l2->iomode)
0292         return l1->iomode != IOMODE_READ;
0293     end1 = pnfs_calc_offset_end(l1->offset, l1->length);
0294     end2 = pnfs_calc_offset_end(l2->offset, l2->length);
0295     if (end1 < l2->offset)
0296         return false;
0297     if (end2 < l1->offset)
0298         return true;
0299     return l2->offset <= l1->offset;
0300 }
0301
0302 static bool
0303 ff_lseg_merge(struct pnfs_layout_segment *new,
0304         struct pnfs_layout_segment *old)
0305 {
0306     u64 new_end, old_end;
0307
0308     if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags))
0309         return false;
0310     if (new->pls_range.iomode != old->pls_range.iomode)
0311         return false;
0312     old_end = pnfs_calc_offset_end(old->pls_range.offset,
0313             old->pls_range.length);
0314     if (old_end < new->pls_range.offset)
0315         return false;
0316     new_end = pnfs_calc_offset_end(new->pls_range.offset,
0317             new->pls_range.length);
0318     if (new_end < old->pls_range.offset)
0319         return false;
0320     if (!ff_lseg_match_mirrors(new, old))
0321         return false;
0322
0323     /* Mergeable: copy info from 'old' to 'new' */
0324     if (new_end < old_end)
0325         new_end = old_end;
0326     if (new->pls_range.offset < old->pls_range.offset)
0327         new->pls_range.offset = old->pls_range.offset;
0328     new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset,
0329             new_end);
0330     if (test_bit(NFS_LSEG_ROC, &old->pls_flags))
0331         set_bit(NFS_LSEG_ROC, &new->pls_flags);
0332     return true;
0333 }
0334
0335 static void
0336 ff_layout_add_lseg(struct pnfs_layout_hdr *lo,
0337         struct pnfs_layout_segment *lseg,
0338         struct list_head *free_me)
0339 {
0340     pnfs_generic_layout_insert_lseg(lo, lseg,
0341             ff_lseg_range_is_after,
0342             ff_lseg_merge,
0343             free_me);
0344 }
0345
0346 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
0347 {
0348     int i, j;
0349
0350     for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
0351         for (j = i + 1; j < fls->mirror_array_cnt; j++)
0352             if (fls->mirror_array[i]->efficiency <
0353                 fls->mirror_array[j]->efficiency)
0354                 swap(fls->mirror_array[i],
0355                      fls->mirror_array[j]);
0356     }
0357 }
0358
0359 static struct pnfs_layout_segment *
0360 ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
0361              struct nfs4_layoutget_res *lgr,
0362              gfp_t gfp_flags)
0363 {
0364     struct pnfs_layout_segment *ret;
0365     struct nfs4_ff_layout_segment *fls = NULL;
0366     struct xdr_stream stream;
0367     struct xdr_buf buf;
0368     struct page *scratch;
0369     u64 stripe_unit;
0370     u32 mirror_array_cnt;
0371     __be32 *p;
0372     int i, rc;
0373
0374     dprintk("--> %s\n", __func__);
0375     scratch = alloc_page(gfp_flags);
0376     if (!scratch)
0377         return ERR_PTR(-ENOMEM);
0378
0379     xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
0380                   lgr->layoutp->len);
0381     xdr_set_scratch_page(&stream, scratch);
0382
0383     /* stripe unit and mirror_array_cnt */
0384     rc = -EIO;
0385     p = xdr_inline_decode(&stream, 8 + 4);
0386     if (!p)
0387         goto out_err_free;
0388
0389     p = xdr_decode_hyper(p, &stripe_unit);
0390     mirror_array_cnt = be32_to_cpup(p++);
0391     dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
0392         stripe_unit, mirror_array_cnt);
0393
0394     if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
0395         mirror_array_cnt == 0)
0396         goto out_err_free;
0397
0398     rc = -ENOMEM;
0399     fls = kzalloc(struct_size(fls, mirror_array, mirror_array_cnt),
0400             gfp_flags);
0401     if (!fls)
0402         goto out_err_free;
0403
0404     fls->mirror_array_cnt = mirror_array_cnt;
0405     fls->stripe_unit = stripe_unit;
0406
0407     for (i = 0; i < fls->mirror_array_cnt; i++) {
0408         struct nfs4_ff_layout_mirror *mirror;
0409         struct cred *kcred;
0410         const struct cred __rcu *cred;
0411         kuid_t uid;
0412         kgid_t gid;
0413         u32 ds_count, fh_count, id;
0414         int j;
0415
0416         rc = -EIO;
0417         p = xdr_inline_decode(&stream, 4);
0418         if (!p)
0419             goto out_err_free;
0420         ds_count = be32_to_cpup(p);
0421
0422         /* FIXME: allow for striping? */
0423         if (ds_count != 1)
0424             goto out_err_free;
0425
0426         fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
0427         if (fls->mirror_array[i] == NULL) {
0428             rc = -ENOMEM;
0429             goto out_err_free;
0430         }
0431
0432         fls->mirror_array[i]->ds_count = ds_count;
0433
0434         /* deviceid */
0435         rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid);
0436         if (rc)
0437             goto out_err_free;
0438
0439         /* efficiency */
0440         rc = -EIO;
0441         p = xdr_inline_decode(&stream, 4);
0442         if (!p)
0443             goto out_err_free;
0444         fls->mirror_array[i]->efficiency = be32_to_cpup(p);
0445
0446         /* stateid */
0447         rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid);
0448         if (rc)
0449             goto out_err_free;
0450
0451         /* fh */
0452         rc = -EIO;
0453         p = xdr_inline_decode(&stream, 4);
0454         if (!p)
0455             goto out_err_free;
0456         fh_count = be32_to_cpup(p);
0457
0458         fls->mirror_array[i]->fh_versions =
0459             kcalloc(fh_count, sizeof(struct nfs_fh),
0460                 gfp_flags);
0461         if (fls->mirror_array[i]->fh_versions == NULL) {
0462             rc = -ENOMEM;
0463             goto out_err_free;
0464         }
0465
0466         for (j = 0; j < fh_count; j++) {
0467             rc = decode_nfs_fh(&stream,
0468                        &fls->mirror_array[i]->fh_versions[j]);
0469             if (rc)
0470                 goto out_err_free;
0471         }
0472
0473         fls->mirror_array[i]->fh_versions_cnt = fh_count;
0474
0475         /* user */
0476         rc = decode_name(&stream, &id);
0477         if (rc)
0478             goto out_err_free;
0479
0480         uid = make_kuid(&init_user_ns, id);
0481
0482         /* group */
0483         rc = decode_name(&stream, &id);
0484         if (rc)
0485             goto out_err_free;
0486
0487         gid = make_kgid(&init_user_ns, id);
0488
0489         if (gfp_flags & __GFP_FS)
0490             kcred = prepare_kernel_cred(NULL);
0491         else {
0492             unsigned int nofs_flags = memalloc_nofs_save();
0493             kcred = prepare_kernel_cred(NULL);
0494             memalloc_nofs_restore(nofs_flags);
0495         }
0496         rc = -ENOMEM;
0497         if (!kcred)
0498             goto out_err_free;
0499         kcred->fsuid = uid;
0500         kcred->fsgid = gid;
0501         cred = RCU_INITIALIZER(kcred);
0502
0503         if (lgr->range.iomode == IOMODE_READ)
0504             rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
0505         else
0506             rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
0507
0508         mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
0509         if (mirror != fls->mirror_array[i]) {
0510             /* swap cred ptrs so free_mirror will clean up old */
0511             if (lgr->range.iomode == IOMODE_READ) {
0512                 cred = xchg(&mirror->ro_cred, cred);
0513                 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
0514             } else {
0515                 cred = xchg(&mirror->rw_cred, cred);
0516                 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
0517             }
0518             ff_layout_free_mirror(fls->mirror_array[i]);
0519             fls->mirror_array[i] = mirror;
0520         }
0521
0522         dprintk("%s: iomode %s uid %u gid %u\n", __func__,
0523             lgr->range.iomode == IOMODE_READ ? "READ" : "RW",
0524             from_kuid(&init_user_ns, uid),
0525             from_kgid(&init_user_ns, gid));
0526     }
0527
0528     p = xdr_inline_decode(&stream, 4);
0529     if (!p)
0530         goto out_sort_mirrors;
0531     fls->flags = be32_to_cpup(p);
0532
0533     p = xdr_inline_decode(&stream, 4);
0534     if (!p)
0535         goto out_sort_mirrors;
0536     for (i=0; i < fls->mirror_array_cnt; i++)
0537         fls->mirror_array[i]->report_interval = be32_to_cpup(p);
0538
0539 out_sort_mirrors:
0540     ff_layout_sort_mirrors(fls);
0541     ret = &fls->generic_hdr;
0542     dprintk("<-- %s (success)\n", __func__);
0543 out_free_page:
0544     __free_page(scratch);
0545     return ret;
0546 out_err_free:
0547     _ff_layout_free_lseg(fls);
0548     ret = ERR_PTR(rc);
0549     dprintk("<-- %s (%d)\n", __func__, rc);
0550     goto out_free_page;
0551 }
0552
0553 static void
0554 ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
0555 {
0556     struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
0557
0558     dprintk("--> %s\n", __func__);
0559
0560     if (lseg->pls_range.iomode == IOMODE_RW) {
0561         struct nfs4_flexfile_layout *ffl;
0562         struct inode *inode;
0563
0564         ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
0565         inode = ffl->generic_hdr.plh_inode;
0566         spin_lock(&inode->i_lock);
0567         pnfs_generic_ds_cinfo_release_lseg(&ffl->commit_info, lseg);
0568         spin_unlock(&inode->i_lock);
0569     }
0570     _ff_layout_free_lseg(fls);
0571 }
0572
0573 static void
0574 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
0575 {
0576     /* first IO request? */
0577     if (atomic_inc_return(&timer->n_ops) == 1) {
0578         timer->start_time = now;
0579     }
0580 }
0581
0582 static ktime_t
0583 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
0584 {
0585     ktime_t start;
0586
0587     if (atomic_dec_return(&timer->n_ops) < 0)
0588         WARN_ON_ONCE(1);
0589
0590     start = timer->start_time;
0591     timer->start_time = now;
0592     return ktime_sub(now, start);
0593 }
0594
0595 static bool
0596 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
0597                 struct nfs4_ff_layoutstat *layoutstat,
0598                 ktime_t now)
0599 {
0600     s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
0601     struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
0602
0603     nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
0604     if (!mirror->start_time)
0605         mirror->start_time = now;
0606     if (mirror->report_interval != 0)
0607         report_interval = (s64)mirror->report_interval * 1000LL;
0608     else if (layoutstats_timer != 0)
0609         report_interval = (s64)layoutstats_timer * 1000LL;
0610     if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
0611             report_interval) {
0612         ffl->last_report_time = now;
0613         return true;
0614     }
0615
0616     return false;
0617 }
0618
0619 static void
0620 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
0621         __u64 requested)
0622 {
0623     struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
0624
0625     iostat->ops_requested++;
0626     iostat->bytes_requested += requested;
0627 }
0628
0629 static void
0630 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
0631         __u64 requested,
0632         __u64 completed,
0633         ktime_t time_completed,
0634         ktime_t time_started)
0635 {
0636     struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
0637     ktime_t completion_time = ktime_sub(time_completed, time_started);
0638     ktime_t timer;
0639
0640     iostat->ops_completed++;
0641     iostat->bytes_completed += completed;
0642     iostat->bytes_not_delivered += requested - completed;
0643
0644     timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
0645     iostat->total_busy_time =
0646             ktime_add(iostat->total_busy_time, timer);
0647     iostat->aggregate_completion_time =
0648             ktime_add(iostat->aggregate_completion_time,
0649                     completion_time);
0650 }
0651
0652 static void
0653 nfs4_ff_layout_stat_io_start_read(struct inode *inode,
0654         struct nfs4_ff_layout_mirror *mirror,
0655         __u64 requested, ktime_t now)
0656 {
0657     bool report;
0658
0659     spin_lock(&mirror->lock);
0660     report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
0661     nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
0662     set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
0663     spin_unlock(&mirror->lock);
0664
0665     if (report)
0666         pnfs_report_layoutstat(inode, nfs_io_gfp_mask());
0667 }
0668
0669 static void
0670 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
0671         struct nfs4_ff_layout_mirror *mirror,
0672         __u64 requested,
0673         __u64 completed)
0674 {
0675     spin_lock(&mirror->lock);
0676     nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
0677             requested, completed,
0678             ktime_get(), task->tk_start);
0679     set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
0680     spin_unlock(&mirror->lock);
0681 }
0682
0683 static void
0684 nfs4_ff_layout_stat_io_start_write(struct inode *inode,
0685         struct nfs4_ff_layout_mirror *mirror,
0686         __u64 requested, ktime_t now)
0687 {
0688     bool report;
0689
0690     spin_lock(&mirror->lock);
0691     report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
0692     nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
0693     set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
0694     spin_unlock(&mirror->lock);
0695
0696     if (report)
0697         pnfs_report_layoutstat(inode, nfs_io_gfp_mask());
0698 }
0699
0700 static void
0701 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
0702         struct nfs4_ff_layout_mirror *mirror,
0703         __u64 requested,
0704         __u64 completed,
0705         enum nfs3_stable_how committed)
0706 {
0707     if (committed == NFS_UNSTABLE)
0708         requested = completed = 0;
0709
0710     spin_lock(&mirror->lock);
0711     nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
0712             requested, completed, ktime_get(), task->tk_start);
0713     set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
0714     spin_unlock(&mirror->lock);
0715 }
0716
0717 static void
0718 ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, u32 idx)
0719 {
0720     struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
0721
0722     if (devid)
0723         nfs4_mark_deviceid_unavailable(devid);
0724 }
0725
0726 static void
0727 ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, u32 idx)
0728 {
0729     struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
0730
0731     if (devid)
0732         nfs4_mark_deviceid_available(devid);
0733 }
0734
0735 static struct nfs4_pnfs_ds *
0736 ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg,
0737                  u32 start_idx, u32 *best_idx,
0738                  bool check_device)
0739 {
0740     struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
0741     struct nfs4_ff_layout_mirror *mirror;
0742     struct nfs4_pnfs_ds *ds;
0743     u32 idx;
0744
0745     /* mirrors are initially sorted by efficiency */
0746     for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
0747         mirror = FF_LAYOUT_COMP(lseg, idx);
0748         ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false);
0749         if (!ds)
0750             continue;
0751
0752         if (check_device &&
0753             nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node))
0754             continue;
0755
0756         *best_idx = idx;
0757         return ds;
0758     }
0759
0760     return NULL;
0761 }
0762
0763 static struct nfs4_pnfs_ds *
0764 ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg,
0765                  u32 start_idx, u32 *best_idx)
0766 {
0767     return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, false);
0768 }
0769
0770 static struct nfs4_pnfs_ds *
0771 ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg,
0772                    u32 start_idx, u32 *best_idx)
0773 {
0774     return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, true);
0775 }
0776
0777 static struct nfs4_pnfs_ds *
0778 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
0779                   u32 start_idx, u32 *best_idx)
0780 {
0781     struct nfs4_pnfs_ds *ds;
0782
0783     ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx);
0784     if (ds)
0785         return ds;
0786     return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx);
0787 }
0788
0789 static struct nfs4_pnfs_ds *
0790 ff_layout_get_ds_for_read(struct nfs_pageio_descriptor *pgio,
0791               u32 *best_idx)
0792 {
0793     struct pnfs_layout_segment *lseg = pgio->pg_lseg;
0794     struct nfs4_pnfs_ds *ds;
0795
0796     ds = ff_layout_choose_best_ds_for_read(lseg, pgio->pg_mirror_idx,
0797                            best_idx);
0798     if (ds || !pgio->pg_mirror_idx)
0799         return ds;
0800     return ff_layout_choose_best_ds_for_read(lseg, 0, best_idx);
0801 }
0802
0803 static void
0804 ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
0805               struct nfs_page *req,
0806               bool strict_iomode)
0807 {
0808     pnfs_put_lseg(pgio->pg_lseg);
0809     pgio->pg_lseg =
0810         pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
0811                    req_offset(req), req->wb_bytes, IOMODE_READ,
0812                    strict_iomode, nfs_io_gfp_mask());
0813     if (IS_ERR(pgio->pg_lseg)) {
0814         pgio->pg_error = PTR_ERR(pgio->pg_lseg);
0815         pgio->pg_lseg = NULL;
0816     }
0817 }
0818
0819 static void
0820 ff_layout_pg_check_layout(struct nfs_pageio_descriptor *pgio,
0821               struct nfs_page *req)
0822 {
0823     pnfs_generic_pg_check_layout(pgio);
0824     pnfs_generic_pg_check_range(pgio, req);
0825 }
0826
0827 static void
0828 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
0829             struct nfs_page *req)
0830 {
0831     struct nfs_pgio_mirror *pgm;
0832     struct nfs4_ff_layout_mirror *mirror;
0833     struct nfs4_pnfs_ds *ds;
0834     u32 ds_idx;
0835
0836 retry:
0837     ff_layout_pg_check_layout(pgio, req);
0838     /* Use full layout for now */
0839     if (!pgio->pg_lseg) {
0840         ff_layout_pg_get_read(pgio, req, false);
0841         if (!pgio->pg_lseg)
0842             goto out_nolseg;
0843     }
0844     if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
0845         ff_layout_pg_get_read(pgio, req, true);
0846         if (!pgio->pg_lseg)
0847             goto out_nolseg;
0848     }
0849
0850     ds = ff_layout_get_ds_for_read(pgio, &ds_idx);
0851     if (!ds) {
0852         if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
0853             goto out_mds;
0854         pnfs_generic_pg_cleanup(pgio);
0855         /* Sleep for 1 second before retrying */
0856         ssleep(1);
0857         goto retry;
0858     }
0859
0860     mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
0861     pgm = &pgio->pg_mirrors[0];
0862     pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
0863
0864     pgio->pg_mirror_idx = ds_idx;
0865
0866     if (NFS_SERVER(pgio->pg_inode)->flags &
0867             (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
0868         pgio->pg_maxretrans = io_maxretrans;
0869     return;
0870 out_nolseg:
0871     if (pgio->pg_error < 0)
0872         return;
0873 out_mds:
0874     trace_pnfs_mds_fallback_pg_init_read(pgio->pg_inode,
0875             0, NFS4_MAX_UINT64, IOMODE_READ,
0876             NFS_I(pgio->pg_inode)->layout,
0877             pgio->pg_lseg);
0878     pgio->pg_maxretrans = 0;
0879     nfs_pageio_reset_read_mds(pgio);
0880 }
0881
0882 static void
0883 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
0884             struct nfs_page *req)
0885 {
0886     struct nfs4_ff_layout_mirror *mirror;
0887     struct nfs_pgio_mirror *pgm;
0888     struct nfs4_pnfs_ds *ds;
0889     u32 i;
0890
0891 retry:
0892     ff_layout_pg_check_layout(pgio, req);
0893     if (!pgio->pg_lseg) {
0894         pgio->pg_lseg =
0895             pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
0896                        req_offset(req), req->wb_bytes,
0897                        IOMODE_RW, false, nfs_io_gfp_mask());
0898         if (IS_ERR(pgio->pg_lseg)) {
0899             pgio->pg_error = PTR_ERR(pgio->pg_lseg);
0900             pgio->pg_lseg = NULL;
0901             return;
0902         }
0903     }
0904     /* If no lseg, fall back to write through mds */
0905     if (pgio->pg_lseg == NULL)
0906         goto out_mds;
0907
0908     /* Use a direct mapping of ds_idx to pgio mirror_idx */
0909     if (pgio->pg_mirror_count != FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg))
0910         goto out_eagain;
0911
0912     for (i = 0; i < pgio->pg_mirror_count; i++) {
0913         mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
0914         ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, true);
0915         if (!ds) {
0916             if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
0917                 goto out_mds;
0918             pnfs_generic_pg_cleanup(pgio);
0919             /* Sleep for 1 second before retrying */
0920             ssleep(1);
0921             goto retry;
0922         }
0923         pgm = &pgio->pg_mirrors[i];
0924         pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
0925     }
0926
0927     if (NFS_SERVER(pgio->pg_inode)->flags &
0928             (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
0929         pgio->pg_maxretrans = io_maxretrans;
0930     return;
0931 out_eagain:
0932     pnfs_generic_pg_cleanup(pgio);
0933     pgio->pg_error = -EAGAIN;
0934     return;
0935 out_mds:
0936     trace_pnfs_mds_fallback_pg_init_write(pgio->pg_inode,
0937             0, NFS4_MAX_UINT64, IOMODE_RW,
0938             NFS_I(pgio->pg_inode)->layout,
0939             pgio->pg_lseg);
0940     pgio->pg_maxretrans = 0;
0941     nfs_pageio_reset_write_mds(pgio);
0942     pgio->pg_error = -EAGAIN;
0943 }
0944
0945 static unsigned int
0946 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
0947                     struct nfs_page *req)
0948 {
0949     if (!pgio->pg_lseg) {
0950         pgio->pg_lseg =
0951             pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
0952                        req_offset(req), req->wb_bytes,
0953                        IOMODE_RW, false, nfs_io_gfp_mask());
0954         if (IS_ERR(pgio->pg_lseg)) {
0955             pgio->pg_error = PTR_ERR(pgio->pg_lseg);
0956             pgio->pg_lseg = NULL;
0957             goto out;
0958         }
0959     }
0960     if (pgio->pg_lseg)
0961         return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
0962
0963     trace_pnfs_mds_fallback_pg_get_mirror_count(pgio->pg_inode,
0964             0, NFS4_MAX_UINT64, IOMODE_RW,
0965             NFS_I(pgio->pg_inode)->layout,
0966             pgio->pg_lseg);
0967     /* no lseg means that pnfs is not in use, so no mirroring here */
0968     nfs_pageio_reset_write_mds(pgio);
0969 out:
0970     return 1;
0971 }
0972
0973 static u32
0974 ff_layout_pg_set_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx)
0975 {
0976     u32 old = desc->pg_mirror_idx;
0977
0978     desc->pg_mirror_idx = idx;
0979     return old;
0980 }
0981
0982 static struct nfs_pgio_mirror *
0983 ff_layout_pg_get_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx)
0984 {
0985     return &desc->pg_mirrors[idx];
0986 }
0987
0988 static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
0989     .pg_init = ff_layout_pg_init_read,
0990     .pg_test = pnfs_generic_pg_test,
0991     .pg_doio = pnfs_generic_pg_readpages,
0992     .pg_cleanup = pnfs_generic_pg_cleanup,
0993 };
0994
0995 static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
0996     .pg_init = ff_layout_pg_init_write,
0997     .pg_test = pnfs_generic_pg_test,
0998     .pg_doio = pnfs_generic_pg_writepages,
0999     .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
1000     .pg_cleanup = pnfs_generic_pg_cleanup,
1001     .pg_get_mirror = ff_layout_pg_get_mirror_write,
1002     .pg_set_mirror = ff_layout_pg_set_mirror_write,
1003 };
1004
1005 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
1006 {
1007     struct rpc_task *task = &hdr->task;
1008
1009     pnfs_layoutcommit_inode(hdr->inode, false);
1010
1011     if (retry_pnfs) {
1012         dprintk("%s Reset task %5u for i/o through pNFS "
1013             "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1014             hdr->task.tk_pid,
1015             hdr->inode->i_sb->s_id,
1016             (unsigned long long)NFS_FILEID(hdr->inode),
1017             hdr->args.count,
1018             (unsigned long long)hdr->args.offset);
1019
1020         hdr->completion_ops->reschedule_io(hdr);
1021         return;
1022     }
1023
1024     if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1025         dprintk("%s Reset task %5u for i/o through MDS "
1026             "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1027             hdr->task.tk_pid,
1028             hdr->inode->i_sb->s_id,
1029             (unsigned long long)NFS_FILEID(hdr->inode),
1030             hdr->args.count,
1031             (unsigned long long)hdr->args.offset);
1032
1033         trace_pnfs_mds_fallback_write_done(hdr->inode,
1034                 hdr->args.offset, hdr->args.count,
1035                 IOMODE_RW, NFS_I(hdr->inode)->layout,
1036                 hdr->lseg);
1037         task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1038     }
1039 }
1040
1041 static void ff_layout_resend_pnfs_read(struct nfs_pgio_header *hdr)
1042 {
1043     u32 idx = hdr->pgio_mirror_idx + 1;
1044     u32 new_idx = 0;
1045
1046     if (ff_layout_choose_any_ds_for_read(hdr->lseg, idx, &new_idx))
1047         ff_layout_send_layouterror(hdr->lseg);
1048     else
1049         pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg);
1050     pnfs_read_resend_pnfs(hdr, new_idx);
1051 }
1052
1053 static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1054 {
1055     struct rpc_task *task = &hdr->task;
1056
1057     pnfs_layoutcommit_inode(hdr->inode, false);
1058     pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg);
1059
1060     if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1061         dprintk("%s Reset task %5u for i/o through MDS "
1062             "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1063             hdr->task.tk_pid,
1064             hdr->inode->i_sb->s_id,
1065             (unsigned long long)NFS_FILEID(hdr->inode),
1066             hdr->args.count,
1067             (unsigned long long)hdr->args.offset);
1068
1069         trace_pnfs_mds_fallback_read_done(hdr->inode,
1070                 hdr->args.offset, hdr->args.count,
1071                 IOMODE_READ, NFS_I(hdr->inode)->layout,
1072                 hdr->lseg);
1073         task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1074     }
1075 }
1076
1077 static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1078                        struct nfs4_state *state,
1079                        struct nfs_client *clp,
1080                        struct pnfs_layout_segment *lseg,
1081                        u32 idx)
1082 {
1083     struct pnfs_layout_hdr *lo = lseg->pls_layout;
1084     struct inode *inode = lo->plh_inode;
1085     struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1086     struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1087
1088     switch (task->tk_status) {
1089     case -NFS4ERR_BADSESSION:
1090     case -NFS4ERR_BADSLOT:
1091     case -NFS4ERR_BAD_HIGH_SLOT:
1092     case -NFS4ERR_DEADSESSION:
1093     case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1094     case -NFS4ERR_SEQ_FALSE_RETRY:
1095     case -NFS4ERR_SEQ_MISORDERED:
1096         dprintk("%s ERROR %d, Reset session. Exchangeid "
1097             "flags 0x%x\n", __func__, task->tk_status,
1098             clp->cl_exchange_flags);
1099         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1100         break;
1101     case -NFS4ERR_DELAY:
1102     case -NFS4ERR_GRACE:
1103         rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1104         break;
1105     case -NFS4ERR_RETRY_UNCACHED_REP:
1106         break;
1107     /* Invalidate Layout errors */
1108     case -NFS4ERR_PNFS_NO_LAYOUT:
1109     case -ESTALE:           /* mapped NFS4ERR_STALE */
1110     case -EBADHANDLE:       /* mapped NFS4ERR_BADHANDLE */
1111     case -EISDIR:           /* mapped NFS4ERR_ISDIR */
1112     case -NFS4ERR_FHEXPIRED:
1113     case -NFS4ERR_WRONG_TYPE:
1114         dprintk("%s Invalid layout error %d\n", __func__,
1115             task->tk_status);
1116         /*
1117          * Destroy layout so new i/o will get a new layout.
1118          * Layout will not be destroyed until all current lseg
1119          * references are put. Mark layout as invalid to resend failed
1120          * i/o and all i/o waiting on the slot table to the MDS until
1121          * layout is destroyed and a new valid layout is obtained.
1122          */
1123         pnfs_destroy_layout(NFS_I(inode));
1124         rpc_wake_up(&tbl->slot_tbl_waitq);
1125         goto reset;
1126     /* RPC connection errors */
1127     case -ECONNREFUSED:
1128     case -EHOSTDOWN:
1129     case -EHOSTUNREACH:
1130     case -ENETUNREACH:
1131     case -EIO:
1132     case -ETIMEDOUT:
1133     case -EPIPE:
1134     case -EPROTO:
1135     case -ENODEV:
1136         dprintk("%s DS connection error %d\n", __func__,
1137             task->tk_status);
1138         nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1139                 &devid->deviceid);
1140         rpc_wake_up(&tbl->slot_tbl_waitq);
1141         fallthrough;
1142     default:
1143         if (ff_layout_avoid_mds_available_ds(lseg))
1144             return -NFS4ERR_RESET_TO_PNFS;
1145 reset:
1146         dprintk("%s Retry through MDS. Error %d\n", __func__,
1147             task->tk_status);
1148         return -NFS4ERR_RESET_TO_MDS;
1149     }
1150     task->tk_status = 0;
1151     return -EAGAIN;
1152 }
1153
1154 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1155 static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1156                        struct pnfs_layout_segment *lseg,
1157                        u32 idx)
1158 {
1159     struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1160
1161     switch (task->tk_status) {
1162     /* File access problems. Don't mark the device as unavailable */
1163     case -EACCES:
1164     case -ESTALE:
1165     case -EISDIR:
1166     case -EBADHANDLE:
1167     case -ELOOP:
1168     case -ENOSPC:
1169         break;
1170     case -EJUKEBOX:
1171         nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1172         goto out_retry;
1173     default:
1174         dprintk("%s DS connection error %d\n", __func__,
1175             task->tk_status);
1176         nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1177                 &devid->deviceid);
1178     }
1179     /* FIXME: Need to prevent infinite looping here. */
1180     return -NFS4ERR_RESET_TO_PNFS;
1181 out_retry:
1182     task->tk_status = 0;
1183     rpc_restart_call_prepare(task);
1184     rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1185     return -EAGAIN;
1186 }
1187
1188 static int ff_layout_async_handle_error(struct rpc_task *task,
1189                     struct nfs4_state *state,
1190                     struct nfs_client *clp,
1191                     struct pnfs_layout_segment *lseg,
1192                     u32 idx)
1193 {
1194     int vers = clp->cl_nfs_mod->rpc_vers->number;
1195
1196     if (task->tk_status >= 0) {
1197         ff_layout_mark_ds_reachable(lseg, idx);
1198         return 0;
1199     }
1200
1201     /* Handle the case of an invalid layout segment */
1202     if (!pnfs_is_valid_lseg(lseg))
1203         return -NFS4ERR_RESET_TO_PNFS;
1204
1205     switch (vers) {
1206     case 3:
1207         return ff_layout_async_handle_error_v3(task, lseg, idx);
1208     case 4:
1209         return ff_layout_async_handle_error_v4(task, state, clp,
1210                                lseg, idx);
1211     default:
1212         /* should never happen */
1213         WARN_ON_ONCE(1);
1214         return 0;
1215     }
1216 }
1217
1218 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1219                     u32 idx, u64 offset, u64 length,
1220                     u32 *op_status, int opnum, int error)
1221 {
1222     struct nfs4_ff_layout_mirror *mirror;
1223     u32 status = *op_status;
1224     int err;
1225
1226     if (status == 0) {
1227         switch (error) {
1228         case -ETIMEDOUT:
1229         case -EPFNOSUPPORT:
1230         case -EPROTONOSUPPORT:
1231         case -EOPNOTSUPP:
1232         case -ECONNREFUSED:
1233         case -ECONNRESET:
1234         case -EHOSTDOWN:
1235         case -EHOSTUNREACH:
1236         case -ENETUNREACH:
1237         case -EADDRINUSE:
1238         case -ENOBUFS:
1239         case -EPIPE:
1240         case -EPERM:
1241         case -EPROTO:
1242         case -ENODEV:
1243             *op_status = status = NFS4ERR_NXIO;
1244             break;
1245         case -EACCES:
1246             *op_status = status = NFS4ERR_ACCESS;
1247             break;
1248         default:
1249             return;
1250         }
1251     }
1252
1253     mirror = FF_LAYOUT_COMP(lseg, idx);
1254     err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1255                        mirror, offset, length, status, opnum,
1256                        nfs_io_gfp_mask());
1257
1258     switch (status) {
1259     case NFS4ERR_DELAY:
1260     case NFS4ERR_GRACE:
1261         break;
1262     case NFS4ERR_NXIO:
1263         ff_layout_mark_ds_unreachable(lseg, idx);
1264         /*
1265          * Don't return the layout if this is a read and we still
1266          * have layouts to try
1267          */
1268         if (opnum == OP_READ)
1269             break;
1270         fallthrough;
1271     default:
1272         pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode,
1273                           lseg);
1274     }
1275
1276     dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1277 }
1278
1279 /* NFS_PROTO call done callback routines */
1280 static int ff_layout_read_done_cb(struct rpc_task *task,
1281                 struct nfs_pgio_header *hdr)
1282 {
1283     int err;
1284
1285     if (task->tk_status < 0) {
1286         ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1287                         hdr->args.offset, hdr->args.count,
1288                         &hdr->res.op_status, OP_READ,
1289                         task->tk_status);
1290         trace_ff_layout_read_error(hdr);
1291     }
1292
1293     err = ff_layout_async_handle_error(task, hdr->args.context->state,
1294                        hdr->ds_clp, hdr->lseg,
1295                        hdr->pgio_mirror_idx);
1296
1297     trace_nfs4_pnfs_read(hdr, err);
1298     clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1299     clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1300     switch (err) {
1301     case -NFS4ERR_RESET_TO_PNFS:
1302         set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1303         return task->tk_status;
1304     case -NFS4ERR_RESET_TO_MDS:
1305         set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1306         return task->tk_status;
1307     case -EAGAIN:
1308         goto out_eagain;
1309     }
1310
1311     return 0;
1312 out_eagain:
1313     rpc_restart_call_prepare(task);
1314     return -EAGAIN;
1315 }
1316
1317 static bool
1318 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1319 {
1320     return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1321 }
1322
1323 /*
1324  * We reference the rpc_cred of the first WRITE that triggers the need for
1325  * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1326  * rfc5661 is not clear about which credential should be used.
1327  *
1328  * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1329  * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1330  * we always send layoutcommit after DS writes.
1331  */
1332 static void
1333 ff_layout_set_layoutcommit(struct inode *inode,
1334         struct pnfs_layout_segment *lseg,
1335         loff_t end_offset)
1336 {
1337     if (!ff_layout_need_layoutcommit(lseg))
1338         return;
1339
1340     pnfs_set_layoutcommit(inode, lseg, end_offset);
1341     dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1342         (unsigned long long) NFS_I(inode)->layout->plh_lwb);
1343 }
1344
1345 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1346         struct nfs_pgio_header *hdr)
1347 {
1348     if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1349         return;
1350     nfs4_ff_layout_stat_io_start_read(hdr->inode,
1351             FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1352             hdr->args.count,
1353             task->tk_start);
1354 }
1355
1356 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1357         struct nfs_pgio_header *hdr)
1358 {
1359     if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1360         return;
1361     nfs4_ff_layout_stat_io_end_read(task,
1362             FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1363             hdr->args.count,
1364             hdr->res.count);
1365     set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
1366 }
1367
1368 static int ff_layout_read_prepare_common(struct rpc_task *task,
1369                      struct nfs_pgio_header *hdr)
1370 {
1371     if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1372         rpc_exit(task, -EIO);
1373         return -EIO;
1374     }
1375
1376     ff_layout_read_record_layoutstats_start(task, hdr);
1377     return 0;
1378 }
1379
1380 /*
1381  * Call ops for the async read/write cases
1382  * In the case of dense layouts, the offset needs to be reset to its
1383  * original value.
1384  */
1385 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1386 {
1387     struct nfs_pgio_header *hdr = data;
1388
1389     if (ff_layout_read_prepare_common(task, hdr))
1390         return;
1391
1392     rpc_call_start(task);
1393 }
1394
1395 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1396 {
1397     struct nfs_pgio_header *hdr = data;
1398
1399     if (nfs4_setup_sequence(hdr->ds_clp,
1400                 &hdr->args.seq_args,
1401                 &hdr->res.seq_res,
1402                 task))
1403         return;
1404
1405     ff_layout_read_prepare_common(task, hdr);
1406 }
1407
1408 static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1409 {
1410     struct nfs_pgio_header *hdr = data;
1411
1412     if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1413         task->tk_status == 0) {
1414         nfs4_sequence_done(task, &hdr->res.seq_res);
1415         return;
1416     }
1417
1418     /* Note this may cause RPC to be resent */
1419     hdr->mds_ops->rpc_call_done(task, hdr);
1420 }
1421
1422 static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1423 {
1424     struct nfs_pgio_header *hdr = data;
1425
1426     ff_layout_read_record_layoutstats_done(task, hdr);
1427     rpc_count_iostats_metrics(task,
1428         &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1429 }
1430
1431 static void ff_layout_read_release(void *data)
1432 {
1433     struct nfs_pgio_header *hdr = data;
1434
1435     ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
1436     if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags))
1437         ff_layout_resend_pnfs_read(hdr);
1438     else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1439         ff_layout_reset_read(hdr);
1440     pnfs_generic_rw_release(data);
1441 }
1442
1443
1444 static int ff_layout_write_done_cb(struct rpc_task *task,
1445                 struct nfs_pgio_header *hdr)
1446 {
1447     loff_t end_offs = 0;
1448     int err;
1449
1450     if (task->tk_status < 0) {
1451         ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1452                         hdr->args.offset, hdr->args.count,
1453                         &hdr->res.op_status, OP_WRITE,
1454                         task->tk_status);
1455         trace_ff_layout_write_error(hdr);
1456     }
1457
1458     err = ff_layout_async_handle_error(task, hdr->args.context->state,
1459                        hdr->ds_clp, hdr->lseg,
1460                        hdr->pgio_mirror_idx);
1461
1462     trace_nfs4_pnfs_write(hdr, err);
1463     clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1464     clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1465     switch (err) {
1466     case -NFS4ERR_RESET_TO_PNFS:
1467         set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1468         return task->tk_status;
1469     case -NFS4ERR_RESET_TO_MDS:
1470         set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1471         return task->tk_status;
1472     case -EAGAIN:
1473         return -EAGAIN;
1474     }
1475
1476     if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1477         hdr->res.verf->committed == NFS_DATA_SYNC)
1478         end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1479
1480     /* Note: if the write is unstable, don't set end_offs until commit */
1481     ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
1482
1483     /* zero out fattr since we don't care DS attr at all */
1484     hdr->fattr.valid = 0;
1485     if (task->tk_status >= 0)
1486         nfs_writeback_update_inode(hdr);
1487
1488     return 0;
1489 }
1490
1491 static int ff_layout_commit_done_cb(struct rpc_task *task,
1492                      struct nfs_commit_data *data)
1493 {
1494     int err;
1495
1496     if (task->tk_status < 0) {
1497         ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1498                         data->args.offset, data->args.count,
1499                         &data->res.op_status, OP_COMMIT,
1500                         task->tk_status);
1501         trace_ff_layout_commit_error(data);
1502     }
1503
1504     err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1505                        data->lseg, data->ds_commit_index);
1506
1507     trace_nfs4_pnfs_commit_ds(data, err);
1508     switch (err) {
1509     case -NFS4ERR_RESET_TO_PNFS:
1510         pnfs_generic_prepare_to_resend_writes(data);
1511         return -EAGAIN;
1512     case -NFS4ERR_RESET_TO_MDS:
1513         pnfs_generic_prepare_to_resend_writes(data);
1514         return -EAGAIN;
1515     case -EAGAIN:
1516         rpc_restart_call_prepare(task);
1517         return -EAGAIN;
1518     }
1519
1520     ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
1521
1522     return 0;
1523 }
1524
1525 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1526         struct nfs_pgio_header *hdr)
1527 {
1528     if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1529         return;
1530     nfs4_ff_layout_stat_io_start_write(hdr->inode,
1531             FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1532             hdr->args.count,
1533             task->tk_start);
1534 }
1535
1536 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1537         struct nfs_pgio_header *hdr)
1538 {
1539     if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1540         return;
1541     nfs4_ff_layout_stat_io_end_write(task,
1542             FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1543             hdr->args.count, hdr->res.count,
1544             hdr->res.verf->committed);
1545     set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
1546 }
1547
1548 static int ff_layout_write_prepare_common(struct rpc_task *task,
1549                       struct nfs_pgio_header *hdr)
1550 {
1551     if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1552         rpc_exit(task, -EIO);
1553         return -EIO;
1554     }
1555
1556     ff_layout_write_record_layoutstats_start(task, hdr);
1557     return 0;
1558 }
1559
1560 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1561 {
1562     struct nfs_pgio_header *hdr = data;
1563
1564     if (ff_layout_write_prepare_common(task, hdr))
1565         return;
1566
1567     rpc_call_start(task);
1568 }
1569
1570 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1571 {
1572     struct nfs_pgio_header *hdr = data;
1573
1574     if (nfs4_setup_sequence(hdr->ds_clp,
1575                 &hdr->args.seq_args,
1576                 &hdr->res.seq_res,
1577                 task))
1578         return;
1579
1580     ff_layout_write_prepare_common(task, hdr);
1581 }
1582
1583 static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1584 {
1585     struct nfs_pgio_header *hdr = data;
1586
1587     if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1588         task->tk_status == 0) {
1589         nfs4_sequence_done(task, &hdr->res.seq_res);
1590         return;
1591     }
1592
1593     /* Note this may cause RPC to be resent */
1594     hdr->mds_ops->rpc_call_done(task, hdr);
1595 }
1596
1597 static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1598 {
1599     struct nfs_pgio_header *hdr = data;
1600
1601     ff_layout_write_record_layoutstats_done(task, hdr);
1602     rpc_count_iostats_metrics(task,
1603         &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1604 }
1605
1606 static void ff_layout_write_release(void *data)
1607 {
1608     struct nfs_pgio_header *hdr = data;
1609
1610     ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
1611     if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) {
1612         ff_layout_send_layouterror(hdr->lseg);
1613         ff_layout_reset_write(hdr, true);
1614     } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1615         ff_layout_reset_write(hdr, false);
1616     pnfs_generic_rw_release(data);
1617 }
1618
1619 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
1620         struct nfs_commit_data *cdata)
1621 {
1622     if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1623         return;
1624     nfs4_ff_layout_stat_io_start_write(cdata->inode,
1625             FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1626             0, task->tk_start);
1627 }
1628
1629 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1630         struct nfs_commit_data *cdata)
1631 {
1632     struct nfs_page *req;
1633     __u64 count = 0;
1634
1635     if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1636         return;
1637
1638     if (task->tk_status == 0) {
1639         list_for_each_entry(req, &cdata->pages, wb_list)
1640             count += req->wb_bytes;
1641     }
1642     nfs4_ff_layout_stat_io_end_write(task,
1643             FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1644             count, count, NFS_FILE_SYNC);
1645     set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags);
1646 }
1647
1648 static void ff_layout_commit_prepare_common(struct rpc_task *task,
1649         struct nfs_commit_data *cdata)
1650 {
1651     ff_layout_commit_record_layoutstats_start(task, cdata);
1652 }
1653
1654 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1655 {
1656     ff_layout_commit_prepare_common(task, data);
1657     rpc_call_start(task);
1658 }
1659
1660 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1661 {
1662     struct nfs_commit_data *wdata = data;
1663
1664     if (nfs4_setup_sequence(wdata->ds_clp,
1665                 &wdata->args.seq_args,
1666                 &wdata->res.seq_res,
1667                 task))
1668         return;
1669     ff_layout_commit_prepare_common(task, data);
1670 }
1671
1672 static void ff_layout_commit_done(struct rpc_task *task, void *data)
1673 {
1674     pnfs_generic_write_commit_done(task, data);
1675 }
1676
1677 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1678 {
1679     struct nfs_commit_data *cdata = data;
1680
1681     ff_layout_commit_record_layoutstats_done(task, cdata);
1682     rpc_count_iostats_metrics(task,
1683         &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1684 }
1685
1686 static void ff_layout_commit_release(void *data)
1687 {
1688     struct nfs_commit_data *cdata = data;
1689
1690     ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1691     pnfs_generic_commit_release(data);
1692 }
1693
1694 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1695     .rpc_call_prepare = ff_layout_read_prepare_v3,
1696     .rpc_call_done = ff_layout_read_call_done,
1697     .rpc_count_stats = ff_layout_read_count_stats,
1698     .rpc_release = ff_layout_read_release,
1699 };
1700
1701 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1702     .rpc_call_prepare = ff_layout_read_prepare_v4,
1703     .rpc_call_done = ff_layout_read_call_done,
1704     .rpc_count_stats = ff_layout_read_count_stats,
1705     .rpc_release = ff_layout_read_release,
1706 };
1707
1708 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1709     .rpc_call_prepare = ff_layout_write_prepare_v3,
1710     .rpc_call_done = ff_layout_write_call_done,
1711     .rpc_count_stats = ff_layout_write_count_stats,
1712     .rpc_release = ff_layout_write_release,
1713 };
1714
1715 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1716     .rpc_call_prepare = ff_layout_write_prepare_v4,
1717     .rpc_call_done = ff_layout_write_call_done,
1718     .rpc_count_stats = ff_layout_write_count_stats,
1719     .rpc_release = ff_layout_write_release,
1720 };
1721
1722 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1723     .rpc_call_prepare = ff_layout_commit_prepare_v3,
1724     .rpc_call_done = ff_layout_commit_done,
1725     .rpc_count_stats = ff_layout_commit_count_stats,
1726     .rpc_release = ff_layout_commit_release,
1727 };
1728
1729 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1730     .rpc_call_prepare = ff_layout_commit_prepare_v4,
1731     .rpc_call_done = ff_layout_commit_done,
1732     .rpc_count_stats = ff_layout_commit_count_stats,
1733     .rpc_release = ff_layout_commit_release,
1734 };
1735
1736 static enum pnfs_try_status
1737 ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1738 {
1739     struct pnfs_layout_segment *lseg = hdr->lseg;
1740     struct nfs4_pnfs_ds *ds;
1741     struct rpc_clnt *ds_clnt;
1742     struct nfs4_ff_layout_mirror *mirror;
1743     const struct cred *ds_cred;
1744     loff_t offset = hdr->args.offset;
1745     u32 idx = hdr->pgio_mirror_idx;
1746     int vers;
1747     struct nfs_fh *fh;
1748
1749     dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n",
1750         __func__, hdr->inode->i_ino,
1751         hdr->args.pgbase, (size_t)hdr->args.count, offset);
1752
1753     mirror = FF_LAYOUT_COMP(lseg, idx);
1754     ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false);
1755     if (!ds)
1756         goto out_failed;
1757
1758     ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1759                            hdr->inode);
1760     if (IS_ERR(ds_clnt))
1761         goto out_failed;
1762
1763     ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
1764     if (!ds_cred)
1765         goto out_failed;
1766
1767     vers = nfs4_ff_layout_ds_version(mirror);
1768
1769     dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1770         ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers);
1771
1772     hdr->pgio_done_cb = ff_layout_read_done_cb;
1773     refcount_inc(&ds->ds_clp->cl_count);
1774     hdr->ds_clp = ds->ds_clp;
1775     fh = nfs4_ff_layout_select_ds_fh(mirror);
1776     if (fh)
1777         hdr->args.fh = fh;
1778
1779     nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
1780
1781     /*
1782      * Note that if we ever decide to split across DSes,
1783      * then we may need to handle dense-like offsets.
1784      */
1785     hdr->args.offset = offset;
1786     hdr->mds_offset = offset;
1787
1788     /* Perform an asynchronous read to ds */
1789     nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1790               vers == 3 ? &ff_layout_read_call_ops_v3 :
1791                       &ff_layout_read_call_ops_v4,
1792               0, RPC_TASK_SOFTCONN);
1793     put_cred(ds_cred);
1794     return PNFS_ATTEMPTED;
1795
1796 out_failed:
1797     if (ff_layout_avoid_mds_available_ds(lseg))
1798         return PNFS_TRY_AGAIN;
1799     trace_pnfs_mds_fallback_read_pagelist(hdr->inode,
1800             hdr->args.offset, hdr->args.count,
1801             IOMODE_READ, NFS_I(hdr->inode)->layout, lseg);
1802     return PNFS_NOT_ATTEMPTED;
1803 }
1804
1805 /* Perform async writes. */
1806 static enum pnfs_try_status
1807 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1808 {
1809     struct pnfs_layout_segment *lseg = hdr->lseg;
1810     struct nfs4_pnfs_ds *ds;
1811     struct rpc_clnt *ds_clnt;
1812     struct nfs4_ff_layout_mirror *mirror;
1813     const struct cred *ds_cred;
1814     loff_t offset = hdr->args.offset;
1815     int vers;
1816     struct nfs_fh *fh;
1817     u32 idx = hdr->pgio_mirror_idx;
1818
1819     mirror = FF_LAYOUT_COMP(lseg, idx);
1820     ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
1821     if (!ds)
1822         goto out_failed;
1823
1824     ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1825                            hdr->inode);
1826     if (IS_ERR(ds_clnt))
1827         goto out_failed;
1828
1829     ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
1830     if (!ds_cred)
1831         goto out_failed;
1832
1833     vers = nfs4_ff_layout_ds_version(mirror);
1834
1835     dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n",
1836         __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1837         offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count),
1838         vers);
1839
1840     hdr->pgio_done_cb = ff_layout_write_done_cb;
1841     refcount_inc(&ds->ds_clp->cl_count);
1842     hdr->ds_clp = ds->ds_clp;
1843     hdr->ds_commit_idx = idx;
1844     fh = nfs4_ff_layout_select_ds_fh(mirror);
1845     if (fh)
1846         hdr->args.fh = fh;
1847
1848     nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
1849
1850     /*
1851      * Note that if we ever decide to split across DSes,
1852      * then we may need to handle dense-like offsets.
1853      */
1854     hdr->args.offset = offset;
1855
1856     /* Perform an asynchronous write */
1857     nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1858               vers == 3 ? &ff_layout_write_call_ops_v3 :
1859                       &ff_layout_write_call_ops_v4,
1860               sync, RPC_TASK_SOFTCONN);
1861     put_cred(ds_cred);
1862     return PNFS_ATTEMPTED;
1863
1864 out_failed:
1865     if (ff_layout_avoid_mds_available_ds(lseg))
1866         return PNFS_TRY_AGAIN;
1867     trace_pnfs_mds_fallback_write_pagelist(hdr->inode,
1868             hdr->args.offset, hdr->args.count,
1869             IOMODE_RW, NFS_I(hdr->inode)->layout, lseg);
1870     return PNFS_NOT_ATTEMPTED;
1871 }
1872
1873 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1874 {
1875     return i;
1876 }
1877
1878 static struct nfs_fh *
1879 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1880 {
1881     struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1882
1883     /* FIXME: Assume that there is only one NFS version available
1884      * for the DS.
1885      */
1886     return &flseg->mirror_array[i]->fh_versions[0];
1887 }
1888
1889 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1890 {
1891     struct pnfs_layout_segment *lseg = data->lseg;
1892     struct nfs4_pnfs_ds *ds;
1893     struct rpc_clnt *ds_clnt;
1894     struct nfs4_ff_layout_mirror *mirror;
1895     const struct cred *ds_cred;
1896     u32 idx;
1897     int vers, ret;
1898     struct nfs_fh *fh;
1899
1900     if (!lseg || !(pnfs_is_valid_lseg(lseg) ||
1901         test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)))
1902         goto out_err;
1903
1904     idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1905     mirror = FF_LAYOUT_COMP(lseg, idx);
1906     ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
1907     if (!ds)
1908         goto out_err;
1909
1910     ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1911                            data->inode);
1912     if (IS_ERR(ds_clnt))
1913         goto out_err;
1914
1915     ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred);
1916     if (!ds_cred)
1917         goto out_err;
1918
1919     vers = nfs4_ff_layout_ds_version(mirror);
1920
1921     dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1922         data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count),
1923         vers);
1924     data->commit_done_cb = ff_layout_commit_done_cb;
1925     data->cred = ds_cred;
1926     refcount_inc(&ds->ds_clp->cl_count);
1927     data->ds_clp = ds->ds_clp;
1928     fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1929     if (fh)
1930         data->args.fh = fh;
1931
1932     ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
1933                    vers == 3 ? &ff_layout_commit_call_ops_v3 :
1934                            &ff_layout_commit_call_ops_v4,
1935                    how, RPC_TASK_SOFTCONN);
1936     put_cred(ds_cred);
1937     return ret;
1938 out_err:
1939     pnfs_generic_prepare_to_resend_writes(data);
1940     pnfs_generic_commit_release(data);
1941     return -EAGAIN;
1942 }
1943
1944 static int
1945 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1946                int how, struct nfs_commit_info *cinfo)
1947 {
1948     return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1949                         ff_layout_initiate_commit);
1950 }
1951
1952 static struct pnfs_ds_commit_info *
1953 ff_layout_get_ds_info(struct inode *inode)
1954 {
1955     struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1956
1957     if (layout == NULL)
1958         return NULL;
1959
1960     return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1961 }
1962
1963 static void
1964 ff_layout_setup_ds_info(struct pnfs_ds_commit_info *fl_cinfo,
1965         struct pnfs_layout_segment *lseg)
1966 {
1967     struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1968     struct inode *inode = lseg->pls_layout->plh_inode;
1969     struct pnfs_commit_array *array, *new;
1970
1971     new = pnfs_alloc_commit_array(flseg->mirror_array_cnt,
1972                       nfs_io_gfp_mask());
1973     if (new) {
1974         spin_lock(&inode->i_lock);
1975         array = pnfs_add_commit_array(fl_cinfo, new, lseg);
1976         spin_unlock(&inode->i_lock);
1977         if (array != new)
1978             pnfs_free_commit_array(new);
1979     }
1980 }
1981
1982 static void
1983 ff_layout_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo,
1984         struct inode *inode)
1985 {
1986     spin_lock(&inode->i_lock);
1987     pnfs_generic_ds_cinfo_destroy(fl_cinfo);
1988     spin_unlock(&inode->i_lock);
1989 }
1990
1991 static void
1992 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
1993 {
1994     nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1995                           id_node));
1996 }
1997
1998 static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
1999                   const struct nfs4_layoutreturn_args *args,
2000                   const struct nfs4_flexfile_layoutreturn_args *ff_args)
2001 {
2002     __be32 *start;
2003
2004     start = xdr_reserve_space(xdr, 4);
2005     if (unlikely(!start))
2006         return -E2BIG;
2007
2008     *start = cpu_to_be32(ff_args->num_errors);
2009     /* This assume we always return _ALL_ layouts */
2010     return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
2011 }
2012
2013 static void
2014 encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
2015 {
2016     WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
2017 }
2018
2019 static void
2020 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
2021                 const nfs4_stateid *stateid,
2022                 const struct nfs42_layoutstat_devinfo *devinfo)
2023 {
2024     __be32 *p;
2025
2026     p = xdr_reserve_space(xdr, 8 + 8);
2027     p = xdr_encode_hyper(p, devinfo->offset);
2028     p = xdr_encode_hyper(p, devinfo->length);
2029     encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
2030     p = xdr_reserve_space(xdr, 4*8);
2031     p = xdr_encode_hyper(p, devinfo->read_count);
2032     p = xdr_encode_hyper(p, devinfo->read_bytes);
2033     p = xdr_encode_hyper(p, devinfo->write_count);
2034     p = xdr_encode_hyper(p, devinfo->write_bytes);
2035     encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
2036 }
2037
2038 static void
2039 ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
2040                 const nfs4_stateid *stateid,
2041                 const struct nfs42_layoutstat_devinfo *devinfo)
2042 {
2043     ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
2044     ff_layout_encode_ff_layoutupdate(xdr, devinfo,
2045             devinfo->ld_private.data);
2046 }
2047
2048 /* report nothing for now */
2049 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
2050         const struct nfs4_layoutreturn_args *args,
2051         struct nfs4_flexfile_layoutreturn_args *ff_args)
2052 {
2053     __be32 *p;
2054     int i;
2055
2056     p = xdr_reserve_space(xdr, 4);
2057     *p = cpu_to_be32(ff_args->num_dev);
2058     for (i = 0; i < ff_args->num_dev; i++)
2059         ff_layout_encode_ff_iostat(xdr,
2060                 &args->layout->plh_stateid,
2061                 &ff_args->devinfo[i]);
2062 }
2063
2064 static void
2065 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
2066         unsigned int num_entries)
2067 {
2068     unsigned int i;
2069
2070     for (i = 0; i < num_entries; i++) {
2071         if (!devinfo[i].ld_private.ops)
2072             continue;
2073         if (!devinfo[i].ld_private.ops->free)
2074             continue;
2075         devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
2076     }
2077 }
2078
2079 static struct nfs4_deviceid_node *
2080 ff_layout_alloc_deviceid_node(struct nfs_server *server,
2081                   struct pnfs_device *pdev, gfp_t gfp_flags)
2082 {
2083     struct nfs4_ff_layout_ds *dsaddr;
2084
2085     dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2086     if (!dsaddr)
2087         return NULL;
2088     return &dsaddr->id_node;
2089 }
2090
2091 static void
2092 ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
2093         const void *voidargs,
2094         const struct nfs4_xdr_opaque_data *ff_opaque)
2095 {
2096     const struct nfs4_layoutreturn_args *args = voidargs;
2097     struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
2098     struct xdr_buf tmp_buf = {
2099         .head = {
2100             [0] = {
2101                 .iov_base = page_address(ff_args->pages[0]),
2102             },
2103         },
2104         .buflen = PAGE_SIZE,
2105     };
2106     struct xdr_stream tmp_xdr;
2107     __be32 *start;
2108
2109     dprintk("%s: Begin\n", __func__);
2110
2111     xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL);
2112
2113     ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
2114     ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
2115
2116     start = xdr_reserve_space(xdr, 4);
2117     *start = cpu_to_be32(tmp_buf.len);
2118     xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
2119
2120     dprintk("%s: Return\n", __func__);
2121 }
2122
2123 static void
2124 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2125 {
2126     struct nfs4_flexfile_layoutreturn_args *ff_args;
2127
2128     if (!args->data)
2129         return;
2130     ff_args = args->data;
2131     args->data = NULL;
2132
2133     ff_layout_free_ds_ioerr(&ff_args->errors);
2134     ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
2135
2136     put_page(ff_args->pages[0]);
2137     kfree(ff_args);
2138 }
2139
2140 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
2141     .encode = ff_layout_encode_layoutreturn,
2142     .free = ff_layout_free_layoutreturn,
2143 };
2144
2145 static int
2146 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2147 {
2148     struct nfs4_flexfile_layoutreturn_args *ff_args;
2149     struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
2150
2151     ff_args = kmalloc(sizeof(*ff_args), nfs_io_gfp_mask());
2152     if (!ff_args)
2153         goto out_nomem;
2154     ff_args->pages[0] = alloc_page(nfs_io_gfp_mask());
2155     if (!ff_args->pages[0])
2156         goto out_nomem_free;
2157
2158     INIT_LIST_HEAD(&ff_args->errors);
2159     ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2160             &args->range, &ff_args->errors,
2161             FF_LAYOUTRETURN_MAXERR);
2162
2163     spin_lock(&args->inode->i_lock);
2164     ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2165             &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo));
2166     spin_unlock(&args->inode->i_lock);
2167
2168     args->ld_private->ops = &layoutreturn_ops;
2169     args->ld_private->data = ff_args;
2170     return 0;
2171 out_nomem_free:
2172     kfree(ff_args);
2173 out_nomem:
2174     return -ENOMEM;
2175 }
2176
2177 #ifdef CONFIG_NFS_V4_2
2178 void
2179 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2180 {
2181     struct pnfs_layout_hdr *lo = lseg->pls_layout;
2182     struct nfs42_layout_error *errors;
2183     LIST_HEAD(head);
2184
2185     if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR))
2186         return;
2187     ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1);
2188     if (list_empty(&head))
2189         return;
2190
2191     errors = kmalloc_array(NFS42_LAYOUTERROR_MAX, sizeof(*errors),
2192                    nfs_io_gfp_mask());
2193     if (errors != NULL) {
2194         const struct nfs4_ff_layout_ds_err *pos;
2195         size_t n = 0;
2196
2197         list_for_each_entry(pos, &head, list) {
2198             errors[n].offset = pos->offset;
2199             errors[n].length = pos->length;
2200             nfs4_stateid_copy(&errors[n].stateid, &pos->stateid);
2201             errors[n].errors[0].dev_id = pos->deviceid;
2202             errors[n].errors[0].status = pos->status;
2203             errors[n].errors[0].opnum = pos->opnum;
2204             n++;
2205             if (!list_is_last(&pos->list, &head) &&
2206                 n < NFS42_LAYOUTERROR_MAX)
2207                 continue;
2208             if (nfs42_proc_layouterror(lseg, errors, n) < 0)
2209                 break;
2210             n = 0;
2211         }
2212         kfree(errors);
2213     }
2214     ff_layout_free_ds_ioerr(&head);
2215 }
2216 #else
2217 void
2218 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2219 {
2220 }
2221 #endif
2222
2223 static int
2224 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2225 {
2226     const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2227
2228     return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2229 }
2230
2231 static size_t
2232 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2233               const int buflen)
2234 {
2235     const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2236     const struct in6_addr *addr = &sin6->sin6_addr;
2237
2238     /*
2239      * RFC 4291, Section 2.2.2
2240      *
2241      * Shorthanded ANY address
2242      */
2243     if (ipv6_addr_any(addr))
2244         return snprintf(buf, buflen, "::");
2245
2246     /*
2247      * RFC 4291, Section 2.2.2
2248      *
2249      * Shorthanded loopback address
2250      */
2251     if (ipv6_addr_loopback(addr))
2252         return snprintf(buf, buflen, "::1");
2253
2254     /*
2255      * RFC 4291, Section 2.2.3
2256      *
2257      * Special presentation address format for mapped v4
2258      * addresses.
2259      */
2260     if (ipv6_addr_v4mapped(addr))
2261         return snprintf(buf, buflen, "::ffff:%pI4",
2262                     &addr->s6_addr32[3]);
2263
2264     /*
2265      * RFC 4291, Section 2.2.1
2266      */
2267     return snprintf(buf, buflen, "%pI6c", addr);
2268 }
2269
2270 /* Derived from rpc_sockaddr2uaddr */
2271 static void
2272 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2273 {
2274     struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2275     char portbuf[RPCBIND_MAXUADDRPLEN];
2276     char addrbuf[RPCBIND_MAXUADDRLEN];
2277     unsigned short port;
2278     int len, netid_len;
2279     __be32 *p;
2280
2281     switch (sap->sa_family) {
2282     case AF_INET:
2283         if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2284             return;
2285         port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2286         break;
2287     case AF_INET6:
2288         if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2289             return;
2290         port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2291         break;
2292     default:
2293         WARN_ON_ONCE(1);
2294         return;
2295     }
2296
2297     snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2298     len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2299
2300     netid_len = strlen(da->da_netid);
2301     p = xdr_reserve_space(xdr, 4 + netid_len);
2302     xdr_encode_opaque(p, da->da_netid, netid_len);
2303
2304     p = xdr_reserve_space(xdr, 4 + len);
2305     xdr_encode_opaque(p, addrbuf, len);
2306 }
2307
2308 static void
2309 ff_layout_encode_nfstime(struct xdr_stream *xdr,
2310              ktime_t t)
2311 {
2312     struct timespec64 ts;
2313     __be32 *p;
2314
2315     p = xdr_reserve_space(xdr, 12);
2316     ts = ktime_to_timespec64(t);
2317     p = xdr_encode_hyper(p, ts.tv_sec);
2318     *p++ = cpu_to_be32(ts.tv_nsec);
2319 }
2320
2321 static void
2322 ff_layout_encode_io_latency(struct xdr_stream *xdr,
2323                 struct nfs4_ff_io_stat *stat)
2324 {
2325     __be32 *p;
2326
2327     p = xdr_reserve_space(xdr, 5 * 8);
2328     p = xdr_encode_hyper(p, stat->ops_requested);
2329     p = xdr_encode_hyper(p, stat->bytes_requested);
2330     p = xdr_encode_hyper(p, stat->ops_completed);
2331     p = xdr_encode_hyper(p, stat->bytes_completed);
2332     p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2333     ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2334     ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2335 }
2336
2337 static void
2338 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2339                   const struct nfs42_layoutstat_devinfo *devinfo,
2340                   struct nfs4_ff_layout_mirror *mirror)
2341 {
2342     struct nfs4_pnfs_ds_addr *da;
2343     struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2344     struct nfs_fh *fh = &mirror->fh_versions[0];
2345     __be32 *p;
2346
2347     da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2348     dprintk("%s: DS %s: encoding address %s\n",
2349         __func__, ds->ds_remotestr, da->da_remotestr);
2350     /* netaddr4 */
2351     ff_layout_encode_netaddr(xdr, da);
2352     /* nfs_fh4 */
2353     p = xdr_reserve_space(xdr, 4 + fh->size);
2354     xdr_encode_opaque(p, fh->data, fh->size);
2355     /* ff_io_latency4 read */
2356     spin_lock(&mirror->lock);
2357     ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2358     /* ff_io_latency4 write */
2359     ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2360     spin_unlock(&mirror->lock);
2361     /* nfstime4 */
2362     ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2363     /* bool */
2364     p = xdr_reserve_space(xdr, 4);
2365     *p = cpu_to_be32(false);
2366 }
2367
2368 static void
2369 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2370                  const struct nfs4_xdr_opaque_data *opaque)
2371 {
2372     struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2373             struct nfs42_layoutstat_devinfo, ld_private);
2374     __be32 *start;
2375
2376     /* layoutupdate length */
2377     start = xdr_reserve_space(xdr, 4);
2378     ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
2379
2380     *start = cpu_to_be32((xdr->p - start - 1) * 4);
2381 }
2382
2383 static void
2384 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2385 {
2386     struct nfs4_ff_layout_mirror *mirror = opaque->data;
2387
2388     ff_layout_put_mirror(mirror);
2389 }
2390
2391 static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2392     .encode = ff_layout_encode_layoutstats,
2393     .free   = ff_layout_free_layoutstats,
2394 };
2395
2396 static int
2397 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2398                    struct nfs42_layoutstat_devinfo *devinfo,
2399                    int dev_limit)
2400 {
2401     struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
2402     struct nfs4_ff_layout_mirror *mirror;
2403     struct nfs4_deviceid_node *dev;
2404     int i = 0;
2405
2406     list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2407         if (i >= dev_limit)
2408             break;
2409         if (IS_ERR_OR_NULL(mirror->mirror_ds))
2410             continue;
2411         if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags))
2412             continue;
2413         /* mirror refcount put in cleanup_layoutstats */
2414         if (!refcount_inc_not_zero(&mirror->ref))
2415             continue;
2416         dev = &mirror->mirror_ds->id_node;
2417         memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
2418         devinfo->offset = 0;
2419         devinfo->length = NFS4_MAX_UINT64;
2420         spin_lock(&mirror->lock);
2421         devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
2422         devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
2423         devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
2424         devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2425         spin_unlock(&mirror->lock);
2426         devinfo->layout_type = LAYOUT_FLEX_FILES;
2427         devinfo->ld_private.ops = &layoutstat_ops;
2428         devinfo->ld_private.data = mirror;
2429
2430         devinfo++;
2431         i++;
2432     }
2433     return i;
2434 }
2435
2436 static int
2437 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2438 {
2439     struct nfs4_flexfile_layout *ff_layout;
2440     const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
2441
2442     /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
2443     args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo),
2444                       nfs_io_gfp_mask());
2445     if (!args->devinfo)
2446         return -ENOMEM;
2447
2448     spin_lock(&args->inode->i_lock);
2449     ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2450     args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2451             &args->devinfo[0], dev_count);
2452     spin_unlock(&args->inode->i_lock);
2453     if (!args->num_dev) {
2454         kfree(args->devinfo);
2455         args->devinfo = NULL;
2456         return -ENOENT;
2457     }
2458
2459     return 0;
2460 }
2461
2462 static int
2463 ff_layout_set_layoutdriver(struct nfs_server *server,
2464         const struct nfs_fh *dummy)
2465 {
2466 #if IS_ENABLED(CONFIG_NFS_V4_2)
2467     server->caps |= NFS_CAP_LAYOUTSTATS;
2468 #endif
2469     return 0;
2470 }
2471
2472 static const struct pnfs_commit_ops ff_layout_commit_ops = {
2473     .setup_ds_info      = ff_layout_setup_ds_info,
2474     .release_ds_info    = ff_layout_release_ds_info,
2475     .mark_request_commit    = pnfs_layout_mark_request_commit,
2476     .clear_request_commit   = pnfs_generic_clear_request_commit,
2477     .scan_commit_lists  = pnfs_generic_scan_commit_lists,
2478     .recover_commit_reqs    = pnfs_generic_recover_commit_reqs,
2479     .commit_pagelist    = ff_layout_commit_pagelist,
2480 };
2481
2482 static struct pnfs_layoutdriver_type flexfilelayout_type = {
2483     .id         = LAYOUT_FLEX_FILES,
2484     .name           = "LAYOUT_FLEX_FILES",
2485     .owner          = THIS_MODULE,
2486     .flags          = PNFS_LAYOUTGET_ON_OPEN,
2487     .max_layoutget_response = 4096, /* 1 page or so... */
2488     .set_layoutdriver   = ff_layout_set_layoutdriver,
2489     .alloc_layout_hdr   = ff_layout_alloc_layout_hdr,
2490     .free_layout_hdr    = ff_layout_free_layout_hdr,
2491     .alloc_lseg     = ff_layout_alloc_lseg,
2492     .free_lseg      = ff_layout_free_lseg,
2493     .add_lseg       = ff_layout_add_lseg,
2494     .pg_read_ops        = &ff_layout_pg_read_ops,
2495     .pg_write_ops       = &ff_layout_pg_write_ops,
2496     .get_ds_info        = ff_layout_get_ds_info,
2497     .free_deviceid_node = ff_layout_free_deviceid_node,
2498     .read_pagelist      = ff_layout_read_pagelist,
2499     .write_pagelist     = ff_layout_write_pagelist,
2500     .alloc_deviceid_node    = ff_layout_alloc_deviceid_node,
2501     .prepare_layoutreturn   = ff_layout_prepare_layoutreturn,
2502     .sync           = pnfs_nfs_generic_sync,
2503     .prepare_layoutstats    = ff_layout_prepare_layoutstats,
2504 };
2505
2506 static int __init nfs4flexfilelayout_init(void)
2507 {
2508     printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2509            __func__);
2510     return pnfs_register_layoutdriver(&flexfilelayout_type);
2511 }
2512
2513 static void __exit nfs4flexfilelayout_exit(void)
2514 {
2515     printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2516            __func__);
2517     pnfs_unregister_layoutdriver(&flexfilelayout_type);
2518 }
2519
2520 MODULE_ALIAS("nfs-layouttype4-4");
2521
2522 MODULE_LICENSE("GPL");
2523 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2524
2525 module_init(nfs4flexfilelayout_init);
2526 module_exit(nfs4flexfilelayout_exit);
2527
2528 module_param(io_maxretrans, ushort, 0644);
2529 MODULE_PARM_DESC(io_maxretrans, "The  number of times the NFSv4.1 client "
2530             "retries an I/O request before returning an error. ");