From 2444ff277a686d743b5479dd52d8357c21d5ce13 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Thu, 14 Feb 2019 13:45:45 -0500 Subject: NFS/flexfiles: refactor calls to fs4_ff_layout_prepare_ds() While we may want to skip attempting to connect to a downed mirror when we're deciding which mirror to select for a read, we do not want to do so once we've committed to attempting the I/O in ff_layout_read/write_pagelist(), or ff_layout_initiate_commit() Signed-off-by: Trond Myklebust --- fs/nfs/flexfilelayout/flexfilelayout.c | 26 ++++++++++++++++++++------ fs/nfs/flexfilelayout/flexfilelayout.h | 3 ++- fs/nfs/flexfilelayout/flexfilelayoutdev.c | 21 ++++++--------------- 3 files changed, 28 insertions(+), 22 deletions(-) (limited to 'fs/nfs/flexfilelayout') diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c index eb86da30d4b9..0134bcac46a7 100644 --- a/fs/nfs/flexfilelayout/flexfilelayout.c +++ b/fs/nfs/flexfilelayout/flexfilelayout.c @@ -794,6 +794,7 @@ ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg, int *best_idx) { struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); + struct nfs4_ff_layout_mirror *mirror; struct nfs4_pnfs_ds *ds; bool fail_return = false; int idx; @@ -802,7 +803,12 @@ ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg, for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) { if (idx+1 == fls->mirror_array_cnt) fail_return = true; - ds = nfs4_ff_layout_prepare_ds(lseg, idx, fail_return); + + mirror = FF_LAYOUT_COMP(lseg, idx); + if (ff_layout_test_devid_unavailable(&mirror->mirror_ds->id_node)) + continue; + + ds = nfs4_ff_layout_prepare_ds(lseg, mirror, fail_return); if (ds) { *best_idx = idx; return ds; @@ -925,7 +931,10 @@ retry: goto out_mds; for (i = 0; i < pgio->pg_mirror_count; i++) { - ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, i, true); + mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i); + if (ff_layout_test_devid_unavailable(&mirror->mirror_ds->id_node)) + continue; + ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, true); if (!ds) { if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg)) goto out_mds; @@ -936,7 +945,6 @@ retry: goto retry; } pgm = &pgio->pg_mirrors[i]; - mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i); pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize; } @@ -1724,6 +1732,7 @@ 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 nfs4_ff_layout_mirror *mirror; const struct cred *ds_cred; loff_t offset = hdr->args.offset; u32 idx = hdr->pgio_mirror_idx; @@ -1734,7 +1743,8 @@ ff_layout_read_pagelist(struct nfs_pgio_header *hdr) __func__, hdr->inode->i_ino, hdr->args.pgbase, (size_t)hdr->args.count, offset); - ds = nfs4_ff_layout_prepare_ds(lseg, idx, false); + mirror = FF_LAYOUT_COMP(lseg, idx); + ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false); if (!ds) goto out_failed; @@ -1791,13 +1801,15 @@ 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 nfs4_ff_layout_mirror *mirror; const struct 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); + mirror = FF_LAYOUT_COMP(lseg, idx); + ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true); if (!ds) goto out_failed; @@ -1870,6 +1882,7 @@ 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 nfs4_ff_layout_mirror *mirror; const struct cred *ds_cred; u32 idx; int vers, ret; @@ -1880,7 +1893,8 @@ static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how) goto out_err; idx = calc_ds_index_from_commit(lseg, data->ds_commit_index); - ds = nfs4_ff_layout_prepare_ds(lseg, idx, true); + mirror = FF_LAYOUT_COMP(lseg, idx); + ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true); if (!ds) goto out_err; diff --git a/fs/nfs/flexfilelayout/flexfilelayout.h b/fs/nfs/flexfilelayout/flexfilelayout.h index 31a62820a5c6..93508112486a 100644 --- a/fs/nfs/flexfilelayout/flexfilelayout.h +++ b/fs/nfs/flexfilelayout/flexfilelayout.h @@ -228,7 +228,8 @@ nfs4_ff_layout_select_ds_stateid(struct pnfs_layout_segment *lseg, nfs4_stateid *stateid); struct nfs4_pnfs_ds * -nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx, +nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, + struct nfs4_ff_layout_mirror *mirror, bool fail_return); struct rpc_clnt * diff --git a/fs/nfs/flexfilelayout/flexfilelayoutdev.c b/fs/nfs/flexfilelayout/flexfilelayoutdev.c index c174f23afc6d..f9a13e1fb1a8 100644 --- a/fs/nfs/flexfilelayout/flexfilelayoutdev.c +++ b/fs/nfs/flexfilelayout/flexfilelayoutdev.c @@ -391,7 +391,7 @@ out: /** * nfs4_ff_layout_prepare_ds - prepare a DS connection for an RPC call * @lseg: the layout segment we're operating on - * @ds_idx: index of the DS to use + * @mirror: layout mirror describing the DS to use * @fail_return: return layout on connect failure? * * Try to prepare a DS connection to accept an RPC call. This involves @@ -406,26 +406,18 @@ out: * Returns a pointer to a connected DS object on success or NULL on failure. */ struct nfs4_pnfs_ds * -nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx, +nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, + struct nfs4_ff_layout_mirror *mirror, 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; int status; - if (!ff_layout_mirror_valid(lseg, mirror, true)) { - pr_err_ratelimited("NFS: %s: No data server for offset index %d\n", - __func__, ds_idx); + if (!ff_layout_mirror_valid(lseg, mirror, true)) goto out; - } - - devid = &mirror->mirror_ds->id_node; - if (ff_layout_test_devid_unavailable(devid)) - goto out_fail; ds = mirror->mirror_ds->ds; /* matching smp_wmb() in _nfs4_pnfs_v3/4_ds_connect */ @@ -436,8 +428,8 @@ nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx, /* FIXME: For now we assume the server sent only one version of NFS * to use for the DS. */ - status = nfs4_pnfs_ds_connect(s, ds, devid, dataserver_timeo, - dataserver_retrans, + status = nfs4_pnfs_ds_connect(s, ds, &mirror->mirror_ds->id_node, + dataserver_timeo, dataserver_retrans, mirror->mirror_ds->ds_versions[0].version, mirror->mirror_ds->ds_versions[0].minor_version); @@ -452,7 +444,6 @@ nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx, mirror->mirror_ds->ds_versions[0].wsize = max_payload; goto out; } -out_fail: ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout), mirror, lseg->pls_range.offset, lseg->pls_range.length, NFS4ERR_NXIO, -- cgit v1.2.3