mirror of https://gitee.com/openkylin/linux.git
pnfs-obj: decode layout, alloc/free lseg
objlayout_alloc_lseg prepares an xdr_stream and calls the raid engins objio_alloc_lseg() to allocate a private pnfs_layout_segment. objio_osd.c::objio_alloc_lseg() uses passed xdr_stream to decode and store the layout_segment information in an objio_segment struct, using the pnfs_osd_xdr.h API for the actual parsing the layout xdr. objlayout_free_lseg calls objio_free_lseg() to free the allocated space. Signed-off-by: Boaz Harrosh <bharrosh@panasas.com> [gfp_flags] [removed "extern" from function definitions] Signed-off-by: Benny Halevy <bhalevy@panasas.com>
This commit is contained in:
Boaz Harrosh
parent
f1bc893a89
commit
09f5bf4e6d
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@ -1,5 +1,5 @@
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#
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# Makefile for the pNFS Objects Layout Driver kernel module
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#
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objlayoutdriver-y := objio_osd.o pnfs_osd_xdr_cli.o
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objlayoutdriver-y := objio_osd.o pnfs_osd_xdr_cli.o objlayout.o
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obj-$(CONFIG_PNFS_OBJLAYOUT) += objlayoutdriver.o
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@ -38,11 +38,179 @@
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*/
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#include <linux/module.h>
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#include "../pnfs.h"
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#include <scsi/osd_initiator.h>
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#include "objlayout.h"
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#define NFSDBG_FACILITY NFSDBG_PNFS_LD
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#define _LLU(x) ((unsigned long long)x)
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struct caps_buffers {
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u8 caps_key[OSD_CRYPTO_KEYID_SIZE];
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u8 creds[OSD_CAP_LEN];
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};
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struct objio_segment {
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struct pnfs_layout_segment lseg;
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struct pnfs_osd_object_cred *comps;
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unsigned mirrors_p1;
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unsigned stripe_unit;
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unsigned group_width; /* Data stripe_units without integrity comps */
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u64 group_depth;
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unsigned group_count;
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unsigned comps_index;
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unsigned num_comps;
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/* variable length */
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struct objio_dev_ent *ods[];
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};
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static inline struct objio_segment *
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OBJIO_LSEG(struct pnfs_layout_segment *lseg)
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{
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return container_of(lseg, struct objio_segment, lseg);
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}
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static int _verify_data_map(struct pnfs_osd_layout *layout)
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{
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struct pnfs_osd_data_map *data_map = &layout->olo_map;
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u64 stripe_length;
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u32 group_width;
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/* FIXME: Only raid0 for now. if not go through MDS */
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if (data_map->odm_raid_algorithm != PNFS_OSD_RAID_0) {
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printk(KERN_ERR "Only RAID_0 for now\n");
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return -ENOTSUPP;
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}
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if (0 != (data_map->odm_num_comps % (data_map->odm_mirror_cnt + 1))) {
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printk(KERN_ERR "Data Map wrong, num_comps=%u mirrors=%u\n",
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data_map->odm_num_comps, data_map->odm_mirror_cnt);
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return -EINVAL;
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}
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if (data_map->odm_group_width)
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group_width = data_map->odm_group_width;
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else
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group_width = data_map->odm_num_comps /
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(data_map->odm_mirror_cnt + 1);
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stripe_length = (u64)data_map->odm_stripe_unit * group_width;
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if (stripe_length >= (1ULL << 32)) {
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printk(KERN_ERR "Total Stripe length(0x%llx)"
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" >= 32bit is not supported\n", _LLU(stripe_length));
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return -ENOTSUPP;
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}
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if (0 != (data_map->odm_stripe_unit & ~PAGE_MASK)) {
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printk(KERN_ERR "Stripe Unit(0x%llx)"
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" must be Multples of PAGE_SIZE(0x%lx)\n",
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_LLU(data_map->odm_stripe_unit), PAGE_SIZE);
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return -ENOTSUPP;
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}
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return 0;
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}
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static void copy_single_comp(struct pnfs_osd_object_cred *cur_comp,
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struct pnfs_osd_object_cred *src_comp,
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struct caps_buffers *caps_p)
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{
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WARN_ON(src_comp->oc_cap_key.cred_len > sizeof(caps_p->caps_key));
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WARN_ON(src_comp->oc_cap.cred_len > sizeof(caps_p->creds));
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*cur_comp = *src_comp;
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memcpy(caps_p->caps_key, src_comp->oc_cap_key.cred,
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sizeof(caps_p->caps_key));
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cur_comp->oc_cap_key.cred = caps_p->caps_key;
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memcpy(caps_p->creds, src_comp->oc_cap.cred,
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sizeof(caps_p->creds));
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cur_comp->oc_cap.cred = caps_p->creds;
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}
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int objio_alloc_lseg(struct pnfs_layout_segment **outp,
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struct pnfs_layout_hdr *pnfslay,
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struct pnfs_layout_range *range,
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struct xdr_stream *xdr,
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gfp_t gfp_flags)
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{
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struct objio_segment *objio_seg;
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struct pnfs_osd_xdr_decode_layout_iter iter;
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struct pnfs_osd_layout layout;
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struct pnfs_osd_object_cred *cur_comp, src_comp;
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struct caps_buffers *caps_p;
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int err;
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err = pnfs_osd_xdr_decode_layout_map(&layout, &iter, xdr);
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if (unlikely(err))
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return err;
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err = _verify_data_map(&layout);
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if (unlikely(err))
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return err;
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objio_seg = kzalloc(sizeof(*objio_seg) +
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sizeof(objio_seg->ods[0]) * layout.olo_num_comps +
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sizeof(*objio_seg->comps) * layout.olo_num_comps +
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sizeof(struct caps_buffers) * layout.olo_num_comps,
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gfp_flags);
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if (!objio_seg)
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return -ENOMEM;
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objio_seg->comps = (void *)(objio_seg->ods + layout.olo_num_comps);
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cur_comp = objio_seg->comps;
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caps_p = (void *)(cur_comp + layout.olo_num_comps);
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while (pnfs_osd_xdr_decode_layout_comp(&src_comp, &iter, xdr, &err))
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copy_single_comp(cur_comp++, &src_comp, caps_p++);
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if (unlikely(err))
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goto err;
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objio_seg->num_comps = layout.olo_num_comps;
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objio_seg->comps_index = layout.olo_comps_index;
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objio_seg->mirrors_p1 = layout.olo_map.odm_mirror_cnt + 1;
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objio_seg->stripe_unit = layout.olo_map.odm_stripe_unit;
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if (layout.olo_map.odm_group_width) {
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objio_seg->group_width = layout.olo_map.odm_group_width;
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objio_seg->group_depth = layout.olo_map.odm_group_depth;
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objio_seg->group_count = layout.olo_map.odm_num_comps /
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objio_seg->mirrors_p1 /
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objio_seg->group_width;
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} else {
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objio_seg->group_width = layout.olo_map.odm_num_comps /
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objio_seg->mirrors_p1;
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objio_seg->group_depth = -1;
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objio_seg->group_count = 1;
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}
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*outp = &objio_seg->lseg;
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return 0;
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err:
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kfree(objio_seg);
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dprintk("%s: Error: return %d\n", __func__, err);
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*outp = NULL;
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return err;
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}
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void objio_free_lseg(struct pnfs_layout_segment *lseg)
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{
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struct objio_segment *objio_seg = OBJIO_LSEG(lseg);
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kfree(objio_seg);
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}
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static struct pnfs_layoutdriver_type objlayout_type = {
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.id = LAYOUT_OSD2_OBJECTS,
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.name = "LAYOUT_OSD2_OBJECTS",
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.alloc_lseg = objlayout_alloc_lseg,
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.free_lseg = objlayout_free_lseg,
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};
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MODULE_DESCRIPTION("pNFS Layout Driver for OSD2 objects");
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@ -0,0 +1,104 @@
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/*
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* pNFS Objects layout driver high level definitions
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*
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* Copyright (C) 2007 Panasas Inc. [year of first publication]
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* All rights reserved.
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*
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* Benny Halevy <bhalevy@panasas.com>
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* Boaz Harrosh <bharrosh@panasas.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* See the file COPYING included with this distribution for more details.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Panasas company nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <scsi/osd_initiator.h>
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#include "objlayout.h"
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#define NFSDBG_FACILITY NFSDBG_PNFS_LD
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/*
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* Unmarshall layout and store it in pnfslay.
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*/
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struct pnfs_layout_segment *
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objlayout_alloc_lseg(struct pnfs_layout_hdr *pnfslay,
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struct nfs4_layoutget_res *lgr,
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gfp_t gfp_flags)
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{
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int status = -ENOMEM;
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struct xdr_stream stream;
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struct xdr_buf buf = {
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.pages = lgr->layoutp->pages,
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.page_len = lgr->layoutp->len,
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.buflen = lgr->layoutp->len,
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.len = lgr->layoutp->len,
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};
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struct page *scratch;
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struct pnfs_layout_segment *lseg;
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dprintk("%s: Begin pnfslay %p\n", __func__, pnfslay);
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scratch = alloc_page(gfp_flags);
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if (!scratch)
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goto err_nofree;
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xdr_init_decode(&stream, &buf, NULL);
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xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
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status = objio_alloc_lseg(&lseg, pnfslay, &lgr->range, &stream, gfp_flags);
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if (unlikely(status)) {
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dprintk("%s: objio_alloc_lseg Return err %d\n", __func__,
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status);
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goto err;
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}
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__free_page(scratch);
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dprintk("%s: Return %p\n", __func__, lseg);
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return lseg;
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err:
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__free_page(scratch);
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err_nofree:
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dprintk("%s: Err Return=>%d\n", __func__, status);
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return ERR_PTR(status);
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}
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/*
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* Free a layout segement
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*/
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void
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objlayout_free_lseg(struct pnfs_layout_segment *lseg)
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{
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dprintk("%s: freeing layout segment %p\n", __func__, lseg);
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if (unlikely(!lseg))
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return;
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objio_free_lseg(lseg);
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}
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@ -0,0 +1,67 @@
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/*
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* Data types and function declerations for interfacing with the
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* pNFS standard object layout driver.
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*
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* Copyright (C) 2007 Panasas Inc. [year of first publication]
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* All rights reserved.
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*
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* Benny Halevy <bhalevy@panasas.com>
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* Boaz Harrosh <bharrosh@panasas.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* See the file COPYING included with this distribution for more details.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Panasas company nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _OBJLAYOUT_H
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#define _OBJLAYOUT_H
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#include <linux/nfs_fs.h>
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#include <linux/pnfs_osd_xdr.h>
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#include "../pnfs.h"
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/*
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* Raid engine I/O API
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*/
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extern int objio_alloc_lseg(struct pnfs_layout_segment **outp,
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struct pnfs_layout_hdr *pnfslay,
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struct pnfs_layout_range *range,
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struct xdr_stream *xdr,
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gfp_t gfp_flags);
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extern void objio_free_lseg(struct pnfs_layout_segment *lseg);
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/*
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* exported generic objects function vectors
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*/
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extern struct pnfs_layout_segment *objlayout_alloc_lseg(
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struct pnfs_layout_hdr *,
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struct nfs4_layoutget_res *,
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gfp_t gfp_flags);
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extern void objlayout_free_lseg(struct pnfs_layout_segment *);
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#endif /* _OBJLAYOUT_H */
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