From: Trond Myklebust Date: Mon, 11 Feb 2019 03:38:43 +0000 (-0500) Subject: NFS/flexfiles: Send LAYOUTERROR when failing over mirrored reads X-Git-Tag: v5.4-rc1~1375^2~32 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f0922a6c0cdb928d21c2599f9671206237e7e505;p=platform%2Fkernel%2Flinux-rpi.git NFS/flexfiles: Send LAYOUTERROR when failing over mirrored reads When a read to the preferred mirror returns an error, the flexfiles driver records the error in the inode list and currently marks the layout for return before failing over the attempted read to the next mirror. What we actually want to do is fire off a LAYOUTERROR to notify the MDS that there is an issue with the preferred mirror, then we fail over. Only once we've failed to read from all mirrors should we return the layout. Signed-off-by: Trond Myklebust --- diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c index a8e9bdd9..eb86da3 100644 --- a/fs/nfs/flexfilelayout/flexfilelayout.c +++ b/fs/nfs/flexfilelayout/flexfilelayout.c @@ -1252,7 +1252,7 @@ static int ff_layout_read_done_cb(struct rpc_task *task, if (ff_layout_choose_best_ds_for_read(hdr->lseg, hdr->pgio_mirror_idx + 1, &hdr->pgio_mirror_idx)) - goto out_eagain; + goto out_layouterror; set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); return task->tk_status; case -NFS4ERR_RESET_TO_MDS: @@ -1263,6 +1263,8 @@ static int ff_layout_read_done_cb(struct rpc_task *task, } return 0; +out_layouterror: + ff_layout_send_layouterror(hdr->lseg); out_eagain: rpc_restart_call_prepare(task); return -EAGAIN; @@ -1412,9 +1414,10 @@ static void ff_layout_read_release(void *data) struct nfs_pgio_header *hdr = data; ff_layout_read_record_layoutstats_done(&hdr->task, hdr); - if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) + if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) { + ff_layout_send_layouterror(hdr->lseg); pnfs_read_resend_pnfs(hdr); - else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) + } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) ff_layout_reset_read(hdr); pnfs_generic_rw_release(data); } @@ -1586,9 +1589,10 @@ static void ff_layout_write_release(void *data) struct nfs_pgio_header *hdr = data; ff_layout_write_record_layoutstats_done(&hdr->task, hdr); - if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) + if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) { + ff_layout_send_layouterror(hdr->lseg); ff_layout_reset_write(hdr, true); - else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) + } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) ff_layout_reset_write(hdr, false); pnfs_generic_rw_release(data); } @@ -2119,6 +2123,52 @@ out_nomem: return -ENOMEM; } +#ifdef CONFIG_NFS_V4_2 +void +ff_layout_send_layouterror(struct pnfs_layout_segment *lseg) +{ + struct pnfs_layout_hdr *lo = lseg->pls_layout; + struct nfs42_layout_error *errors; + LIST_HEAD(head); + + if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR)) + return; + ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1); + if (list_empty(&head)) + return; + + errors = kmalloc_array(NFS42_LAYOUTERROR_MAX, + sizeof(*errors), GFP_NOFS); + if (errors != NULL) { + const struct nfs4_ff_layout_ds_err *pos; + size_t n = 0; + + list_for_each_entry(pos, &head, list) { + errors[n].offset = pos->offset; + errors[n].length = pos->length; + nfs4_stateid_copy(&errors[n].stateid, &pos->stateid); + errors[n].errors[0].dev_id = pos->deviceid; + errors[n].errors[0].status = pos->status; + errors[n].errors[0].opnum = pos->opnum; + n++; + if (!list_is_last(&pos->list, &head) && + n < NFS42_LAYOUTERROR_MAX) + continue; + if (nfs42_proc_layouterror(lseg, errors, n) < 0) + break; + n = 0; + } + kfree(errors); + } + ff_layout_free_ds_ioerr(&head); +} +#else +void +ff_layout_send_layouterror(struct pnfs_layout_segment *lseg) +{ +} +#endif + static int ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen) { diff --git a/fs/nfs/flexfilelayout/flexfilelayout.h b/fs/nfs/flexfilelayout/flexfilelayout.h index 8a2d5d6..31a6282 100644 --- a/fs/nfs/flexfilelayout/flexfilelayout.h +++ b/fs/nfs/flexfilelayout/flexfilelayout.h @@ -213,6 +213,7 @@ int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo, struct nfs4_ff_layout_mirror *mirror, u64 offset, u64 length, int status, enum nfs_opnum4 opnum, gfp_t gfp_flags); +void ff_layout_send_layouterror(struct pnfs_layout_segment *lseg); int ff_layout_encode_ds_ioerr(struct xdr_stream *xdr, const struct list_head *head); void ff_layout_free_ds_ioerr(struct list_head *head); unsigned int ff_layout_fetch_ds_ioerr(struct pnfs_layout_hdr *lo, diff --git a/fs/nfs/flexfilelayout/flexfilelayoutdev.c b/fs/nfs/flexfilelayout/flexfilelayoutdev.c index ca7a620..c174f23 100644 --- a/fs/nfs/flexfilelayout/flexfilelayoutdev.c +++ b/fs/nfs/flexfilelayout/flexfilelayoutdev.c @@ -326,7 +326,6 @@ int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo, spin_lock(&flo->generic_hdr.plh_inode->i_lock); ff_layout_add_ds_error_locked(flo, dserr); spin_unlock(&flo->generic_hdr.plh_inode->i_lock); - return 0; } @@ -458,6 +457,7 @@ out_fail: mirror, lseg->pls_range.offset, lseg->pls_range.length, NFS4ERR_NXIO, OP_ILLEGAL, GFP_NOIO); + ff_layout_send_layouterror(lseg); if (fail_return || !ff_layout_has_available_ds(lseg)) pnfs_error_mark_layout_for_return(ino, lseg); ds = NULL;