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![Dan Williams](/assets/img/avatar_default.png)
NVDIMM namespaces, in addition to accepting "struct bio" based requests, also have the capability to perform byte-aligned accesses. By default only the bio/block interface is used. However, if another driver can make effective use of the byte-aligned capability it can claim namespace interface and use the byte-aligned ->rw_bytes() interface. The BTT driver is the initial first consumer of this mechanism to allow adding atomic sector update semantics to a pmem or blk namespace. This patch is the sysfs infrastructure to allow configuring a BTT instance for a namespace. Enabling that BTT and performing i/o is in a subsequent patch. Cc: Greg KH <gregkh@linuxfoundation.org> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
927 lines
24 KiB
C
927 lines
24 KiB
C
/*
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* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
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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 version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/device.h>
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#include <linux/ndctl.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/nd.h>
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#include "nd-core.h"
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#include "label.h"
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#include "nd.h"
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static u32 best_seq(u32 a, u32 b)
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{
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a &= NSINDEX_SEQ_MASK;
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b &= NSINDEX_SEQ_MASK;
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if (a == 0 || a == b)
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return b;
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else if (b == 0)
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return a;
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else if (nd_inc_seq(a) == b)
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return b;
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else
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return a;
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}
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size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd)
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{
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u32 index_span;
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if (ndd->nsindex_size)
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return ndd->nsindex_size;
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/*
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* The minimum index space is 512 bytes, with that amount of
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* index we can describe ~1400 labels which is less than a byte
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* of overhead per label. Round up to a byte of overhead per
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* label and determine the size of the index region. Yes, this
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* starts to waste space at larger config_sizes, but it's
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* unlikely we'll ever see anything but 128K.
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*/
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index_span = ndd->nsarea.config_size / 129;
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index_span /= NSINDEX_ALIGN * 2;
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ndd->nsindex_size = index_span * NSINDEX_ALIGN;
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return ndd->nsindex_size;
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}
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int nvdimm_num_label_slots(struct nvdimm_drvdata *ndd)
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{
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return ndd->nsarea.config_size / 129;
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}
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int nd_label_validate(struct nvdimm_drvdata *ndd)
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{
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/*
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* On media label format consists of two index blocks followed
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* by an array of labels. None of these structures are ever
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* updated in place. A sequence number tracks the current
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* active index and the next one to write, while labels are
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* written to free slots.
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*
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* +------------+
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* | |
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* | nsindex0 |
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* | |
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* +------------+
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* | |
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* | nsindex1 |
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* | |
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* +------------+
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* | label0 |
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* +------------+
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* | label1 |
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* +------------+
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* | |
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* ....nslot...
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* | |
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* +------------+
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* | labelN |
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* +------------+
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*/
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struct nd_namespace_index *nsindex[] = {
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to_namespace_index(ndd, 0),
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to_namespace_index(ndd, 1),
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};
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const int num_index = ARRAY_SIZE(nsindex);
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struct device *dev = ndd->dev;
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bool valid[2] = { 0 };
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int i, num_valid = 0;
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u32 seq;
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for (i = 0; i < num_index; i++) {
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u32 nslot;
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u8 sig[NSINDEX_SIG_LEN];
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u64 sum_save, sum, size;
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memcpy(sig, nsindex[i]->sig, NSINDEX_SIG_LEN);
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if (memcmp(sig, NSINDEX_SIGNATURE, NSINDEX_SIG_LEN) != 0) {
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dev_dbg(dev, "%s: nsindex%d signature invalid\n",
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__func__, i);
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continue;
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}
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sum_save = __le64_to_cpu(nsindex[i]->checksum);
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nsindex[i]->checksum = __cpu_to_le64(0);
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sum = nd_fletcher64(nsindex[i], sizeof_namespace_index(ndd), 1);
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nsindex[i]->checksum = __cpu_to_le64(sum_save);
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if (sum != sum_save) {
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dev_dbg(dev, "%s: nsindex%d checksum invalid\n",
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__func__, i);
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continue;
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}
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seq = __le32_to_cpu(nsindex[i]->seq);
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if ((seq & NSINDEX_SEQ_MASK) == 0) {
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dev_dbg(dev, "%s: nsindex%d sequence: %#x invalid\n",
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__func__, i, seq);
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continue;
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}
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/* sanity check the index against expected values */
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if (__le64_to_cpu(nsindex[i]->myoff)
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!= i * sizeof_namespace_index(ndd)) {
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dev_dbg(dev, "%s: nsindex%d myoff: %#llx invalid\n",
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__func__, i, (unsigned long long)
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__le64_to_cpu(nsindex[i]->myoff));
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continue;
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}
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if (__le64_to_cpu(nsindex[i]->otheroff)
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!= (!i) * sizeof_namespace_index(ndd)) {
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dev_dbg(dev, "%s: nsindex%d otheroff: %#llx invalid\n",
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__func__, i, (unsigned long long)
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__le64_to_cpu(nsindex[i]->otheroff));
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continue;
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}
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size = __le64_to_cpu(nsindex[i]->mysize);
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if (size > sizeof_namespace_index(ndd)
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|| size < sizeof(struct nd_namespace_index)) {
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dev_dbg(dev, "%s: nsindex%d mysize: %#llx invalid\n",
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__func__, i, size);
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continue;
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}
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nslot = __le32_to_cpu(nsindex[i]->nslot);
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if (nslot * sizeof(struct nd_namespace_label)
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+ 2 * sizeof_namespace_index(ndd)
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> ndd->nsarea.config_size) {
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dev_dbg(dev, "%s: nsindex%d nslot: %u invalid, config_size: %#x\n",
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__func__, i, nslot,
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ndd->nsarea.config_size);
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continue;
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}
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valid[i] = true;
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num_valid++;
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}
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switch (num_valid) {
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case 0:
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break;
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case 1:
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for (i = 0; i < num_index; i++)
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if (valid[i])
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return i;
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/* can't have num_valid > 0 but valid[] = { false, false } */
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WARN_ON(1);
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break;
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default:
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/* pick the best index... */
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seq = best_seq(__le32_to_cpu(nsindex[0]->seq),
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__le32_to_cpu(nsindex[1]->seq));
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if (seq == (__le32_to_cpu(nsindex[1]->seq) & NSINDEX_SEQ_MASK))
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return 1;
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else
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return 0;
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break;
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}
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return -1;
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}
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void nd_label_copy(struct nvdimm_drvdata *ndd, struct nd_namespace_index *dst,
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struct nd_namespace_index *src)
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{
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if (dst && src)
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/* pass */;
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else
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return;
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memcpy(dst, src, sizeof_namespace_index(ndd));
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}
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static struct nd_namespace_label *nd_label_base(struct nvdimm_drvdata *ndd)
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{
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void *base = to_namespace_index(ndd, 0);
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return base + 2 * sizeof_namespace_index(ndd);
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}
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static int to_slot(struct nvdimm_drvdata *ndd,
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struct nd_namespace_label *nd_label)
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{
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return nd_label - nd_label_base(ndd);
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}
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#define for_each_clear_bit_le(bit, addr, size) \
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for ((bit) = find_next_zero_bit_le((addr), (size), 0); \
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(bit) < (size); \
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(bit) = find_next_zero_bit_le((addr), (size), (bit) + 1))
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/**
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* preamble_index - common variable initialization for nd_label_* routines
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* @ndd: dimm container for the relevant label set
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* @idx: namespace_index index
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* @nsindex_out: on return set to the currently active namespace index
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* @free: on return set to the free label bitmap in the index
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* @nslot: on return set to the number of slots in the label space
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*/
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static bool preamble_index(struct nvdimm_drvdata *ndd, int idx,
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struct nd_namespace_index **nsindex_out,
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unsigned long **free, u32 *nslot)
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{
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struct nd_namespace_index *nsindex;
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nsindex = to_namespace_index(ndd, idx);
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if (nsindex == NULL)
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return false;
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*free = (unsigned long *) nsindex->free;
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*nslot = __le32_to_cpu(nsindex->nslot);
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*nsindex_out = nsindex;
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return true;
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}
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char *nd_label_gen_id(struct nd_label_id *label_id, u8 *uuid, u32 flags)
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{
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if (!label_id || !uuid)
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return NULL;
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snprintf(label_id->id, ND_LABEL_ID_SIZE, "%s-%pUb",
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flags & NSLABEL_FLAG_LOCAL ? "blk" : "pmem", uuid);
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return label_id->id;
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}
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static bool preamble_current(struct nvdimm_drvdata *ndd,
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struct nd_namespace_index **nsindex,
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unsigned long **free, u32 *nslot)
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{
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return preamble_index(ndd, ndd->ns_current, nsindex,
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free, nslot);
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}
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static bool preamble_next(struct nvdimm_drvdata *ndd,
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struct nd_namespace_index **nsindex,
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unsigned long **free, u32 *nslot)
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{
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return preamble_index(ndd, ndd->ns_next, nsindex,
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free, nslot);
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}
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static bool slot_valid(struct nd_namespace_label *nd_label, u32 slot)
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{
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/* check that we are written where we expect to be written */
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if (slot != __le32_to_cpu(nd_label->slot))
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return false;
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/* check that DPA allocations are page aligned */
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if ((__le64_to_cpu(nd_label->dpa)
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| __le64_to_cpu(nd_label->rawsize)) % SZ_4K)
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return false;
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return true;
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}
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int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd)
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{
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struct nd_namespace_index *nsindex;
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unsigned long *free;
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u32 nslot, slot;
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if (!preamble_current(ndd, &nsindex, &free, &nslot))
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return 0; /* no label, nothing to reserve */
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for_each_clear_bit_le(slot, free, nslot) {
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struct nd_namespace_label *nd_label;
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struct nd_region *nd_region = NULL;
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u8 label_uuid[NSLABEL_UUID_LEN];
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struct nd_label_id label_id;
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struct resource *res;
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u32 flags;
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nd_label = nd_label_base(ndd) + slot;
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if (!slot_valid(nd_label, slot))
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continue;
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memcpy(label_uuid, nd_label->uuid, NSLABEL_UUID_LEN);
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flags = __le32_to_cpu(nd_label->flags);
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nd_label_gen_id(&label_id, label_uuid, flags);
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res = nvdimm_allocate_dpa(ndd, &label_id,
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__le64_to_cpu(nd_label->dpa),
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__le64_to_cpu(nd_label->rawsize));
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nd_dbg_dpa(nd_region, ndd, res, "reserve\n");
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if (!res)
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return -EBUSY;
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}
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return 0;
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}
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int nd_label_active_count(struct nvdimm_drvdata *ndd)
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{
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struct nd_namespace_index *nsindex;
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unsigned long *free;
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u32 nslot, slot;
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int count = 0;
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if (!preamble_current(ndd, &nsindex, &free, &nslot))
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return 0;
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for_each_clear_bit_le(slot, free, nslot) {
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struct nd_namespace_label *nd_label;
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nd_label = nd_label_base(ndd) + slot;
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if (!slot_valid(nd_label, slot)) {
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u32 label_slot = __le32_to_cpu(nd_label->slot);
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u64 size = __le64_to_cpu(nd_label->rawsize);
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u64 dpa = __le64_to_cpu(nd_label->dpa);
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dev_dbg(ndd->dev,
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"%s: slot%d invalid slot: %d dpa: %llx size: %llx\n",
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__func__, slot, label_slot, dpa, size);
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continue;
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}
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count++;
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}
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return count;
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}
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struct nd_namespace_label *nd_label_active(struct nvdimm_drvdata *ndd, int n)
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{
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struct nd_namespace_index *nsindex;
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unsigned long *free;
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u32 nslot, slot;
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if (!preamble_current(ndd, &nsindex, &free, &nslot))
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return NULL;
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for_each_clear_bit_le(slot, free, nslot) {
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struct nd_namespace_label *nd_label;
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nd_label = nd_label_base(ndd) + slot;
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if (!slot_valid(nd_label, slot))
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continue;
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if (n-- == 0)
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return nd_label_base(ndd) + slot;
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}
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return NULL;
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}
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u32 nd_label_alloc_slot(struct nvdimm_drvdata *ndd)
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{
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struct nd_namespace_index *nsindex;
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unsigned long *free;
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u32 nslot, slot;
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if (!preamble_next(ndd, &nsindex, &free, &nslot))
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return UINT_MAX;
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WARN_ON(!is_nvdimm_bus_locked(ndd->dev));
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slot = find_next_bit_le(free, nslot, 0);
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if (slot == nslot)
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return UINT_MAX;
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clear_bit_le(slot, free);
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return slot;
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}
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bool nd_label_free_slot(struct nvdimm_drvdata *ndd, u32 slot)
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{
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struct nd_namespace_index *nsindex;
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unsigned long *free;
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u32 nslot;
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if (!preamble_next(ndd, &nsindex, &free, &nslot))
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return false;
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WARN_ON(!is_nvdimm_bus_locked(ndd->dev));
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if (slot < nslot)
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return !test_and_set_bit_le(slot, free);
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return false;
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}
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u32 nd_label_nfree(struct nvdimm_drvdata *ndd)
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{
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struct nd_namespace_index *nsindex;
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unsigned long *free;
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u32 nslot;
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WARN_ON(!is_nvdimm_bus_locked(ndd->dev));
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if (!preamble_next(ndd, &nsindex, &free, &nslot))
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return nvdimm_num_label_slots(ndd);
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return bitmap_weight(free, nslot);
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}
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static int nd_label_write_index(struct nvdimm_drvdata *ndd, int index, u32 seq,
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unsigned long flags)
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{
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struct nd_namespace_index *nsindex;
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unsigned long offset;
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u64 checksum;
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u32 nslot;
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int rc;
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nsindex = to_namespace_index(ndd, index);
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if (flags & ND_NSINDEX_INIT)
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nslot = nvdimm_num_label_slots(ndd);
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else
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nslot = __le32_to_cpu(nsindex->nslot);
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memcpy(nsindex->sig, NSINDEX_SIGNATURE, NSINDEX_SIG_LEN);
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nsindex->flags = __cpu_to_le32(0);
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nsindex->seq = __cpu_to_le32(seq);
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offset = (unsigned long) nsindex
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- (unsigned long) to_namespace_index(ndd, 0);
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nsindex->myoff = __cpu_to_le64(offset);
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nsindex->mysize = __cpu_to_le64(sizeof_namespace_index(ndd));
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offset = (unsigned long) to_namespace_index(ndd,
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nd_label_next_nsindex(index))
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- (unsigned long) to_namespace_index(ndd, 0);
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nsindex->otheroff = __cpu_to_le64(offset);
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offset = (unsigned long) nd_label_base(ndd)
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- (unsigned long) to_namespace_index(ndd, 0);
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nsindex->labeloff = __cpu_to_le64(offset);
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nsindex->nslot = __cpu_to_le32(nslot);
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nsindex->major = __cpu_to_le16(1);
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nsindex->minor = __cpu_to_le16(1);
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nsindex->checksum = __cpu_to_le64(0);
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if (flags & ND_NSINDEX_INIT) {
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unsigned long *free = (unsigned long *) nsindex->free;
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u32 nfree = ALIGN(nslot, BITS_PER_LONG);
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int last_bits, i;
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memset(nsindex->free, 0xff, nfree / 8);
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for (i = 0, last_bits = nfree - nslot; i < last_bits; i++)
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clear_bit_le(nslot + i, free);
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}
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checksum = nd_fletcher64(nsindex, sizeof_namespace_index(ndd), 1);
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nsindex->checksum = __cpu_to_le64(checksum);
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rc = nvdimm_set_config_data(ndd, __le64_to_cpu(nsindex->myoff),
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nsindex, sizeof_namespace_index(ndd));
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if (rc < 0)
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return rc;
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if (flags & ND_NSINDEX_INIT)
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return 0;
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/* copy the index we just wrote to the new 'next' */
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WARN_ON(index != ndd->ns_next);
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nd_label_copy(ndd, to_current_namespace_index(ndd), nsindex);
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ndd->ns_current = nd_label_next_nsindex(ndd->ns_current);
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ndd->ns_next = nd_label_next_nsindex(ndd->ns_next);
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WARN_ON(ndd->ns_current == ndd->ns_next);
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return 0;
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}
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static unsigned long nd_label_offset(struct nvdimm_drvdata *ndd,
|
|
struct nd_namespace_label *nd_label)
|
|
{
|
|
return (unsigned long) nd_label
|
|
- (unsigned long) to_namespace_index(ndd, 0);
|
|
}
|
|
|
|
static int __pmem_label_update(struct nd_region *nd_region,
|
|
struct nd_mapping *nd_mapping, struct nd_namespace_pmem *nspm,
|
|
int pos)
|
|
{
|
|
u64 cookie = nd_region_interleave_set_cookie(nd_region), rawsize;
|
|
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
|
|
struct nd_namespace_label *victim_label;
|
|
struct nd_namespace_label *nd_label;
|
|
struct nd_namespace_index *nsindex;
|
|
unsigned long *free;
|
|
u32 nslot, slot;
|
|
size_t offset;
|
|
int rc;
|
|
|
|
if (!preamble_next(ndd, &nsindex, &free, &nslot))
|
|
return -ENXIO;
|
|
|
|
/* allocate and write the label to the staging (next) index */
|
|
slot = nd_label_alloc_slot(ndd);
|
|
if (slot == UINT_MAX)
|
|
return -ENXIO;
|
|
dev_dbg(ndd->dev, "%s: allocated: %d\n", __func__, slot);
|
|
|
|
nd_label = nd_label_base(ndd) + slot;
|
|
memset(nd_label, 0, sizeof(struct nd_namespace_label));
|
|
memcpy(nd_label->uuid, nspm->uuid, NSLABEL_UUID_LEN);
|
|
if (nspm->alt_name)
|
|
memcpy(nd_label->name, nspm->alt_name, NSLABEL_NAME_LEN);
|
|
nd_label->flags = __cpu_to_le32(NSLABEL_FLAG_UPDATING);
|
|
nd_label->nlabel = __cpu_to_le16(nd_region->ndr_mappings);
|
|
nd_label->position = __cpu_to_le16(pos);
|
|
nd_label->isetcookie = __cpu_to_le64(cookie);
|
|
rawsize = div_u64(resource_size(&nspm->nsio.res),
|
|
nd_region->ndr_mappings);
|
|
nd_label->rawsize = __cpu_to_le64(rawsize);
|
|
nd_label->dpa = __cpu_to_le64(nd_mapping->start);
|
|
nd_label->slot = __cpu_to_le32(slot);
|
|
|
|
/* update label */
|
|
offset = nd_label_offset(ndd, nd_label);
|
|
rc = nvdimm_set_config_data(ndd, offset, nd_label,
|
|
sizeof(struct nd_namespace_label));
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
/* Garbage collect the previous label */
|
|
victim_label = nd_mapping->labels[0];
|
|
if (victim_label) {
|
|
slot = to_slot(ndd, victim_label);
|
|
nd_label_free_slot(ndd, slot);
|
|
dev_dbg(ndd->dev, "%s: free: %d\n", __func__, slot);
|
|
}
|
|
|
|
/* update index */
|
|
rc = nd_label_write_index(ndd, ndd->ns_next,
|
|
nd_inc_seq(__le32_to_cpu(nsindex->seq)), 0);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
nd_mapping->labels[0] = nd_label;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void del_label(struct nd_mapping *nd_mapping, int l)
|
|
{
|
|
struct nd_namespace_label *next_label, *nd_label;
|
|
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
|
|
unsigned int slot;
|
|
int j;
|
|
|
|
nd_label = nd_mapping->labels[l];
|
|
slot = to_slot(ndd, nd_label);
|
|
dev_vdbg(ndd->dev, "%s: clear: %d\n", __func__, slot);
|
|
|
|
for (j = l; (next_label = nd_mapping->labels[j + 1]); j++)
|
|
nd_mapping->labels[j] = next_label;
|
|
nd_mapping->labels[j] = NULL;
|
|
}
|
|
|
|
static bool is_old_resource(struct resource *res, struct resource **list, int n)
|
|
{
|
|
int i;
|
|
|
|
if (res->flags & DPA_RESOURCE_ADJUSTED)
|
|
return false;
|
|
for (i = 0; i < n; i++)
|
|
if (res == list[i])
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
static struct resource *to_resource(struct nvdimm_drvdata *ndd,
|
|
struct nd_namespace_label *nd_label)
|
|
{
|
|
struct resource *res;
|
|
|
|
for_each_dpa_resource(ndd, res) {
|
|
if (res->start != __le64_to_cpu(nd_label->dpa))
|
|
continue;
|
|
if (resource_size(res) != __le64_to_cpu(nd_label->rawsize))
|
|
continue;
|
|
return res;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* 1/ Account all the labels that can be freed after this update
|
|
* 2/ Allocate and write the label to the staging (next) index
|
|
* 3/ Record the resources in the namespace device
|
|
*/
|
|
static int __blk_label_update(struct nd_region *nd_region,
|
|
struct nd_mapping *nd_mapping, struct nd_namespace_blk *nsblk,
|
|
int num_labels)
|
|
{
|
|
int i, l, alloc, victims, nfree, old_num_resources, nlabel, rc = -ENXIO;
|
|
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
|
|
struct nd_namespace_label *nd_label;
|
|
struct nd_namespace_index *nsindex;
|
|
unsigned long *free, *victim_map = NULL;
|
|
struct resource *res, **old_res_list;
|
|
struct nd_label_id label_id;
|
|
u8 uuid[NSLABEL_UUID_LEN];
|
|
u32 nslot, slot;
|
|
|
|
if (!preamble_next(ndd, &nsindex, &free, &nslot))
|
|
return -ENXIO;
|
|
|
|
old_res_list = nsblk->res;
|
|
nfree = nd_label_nfree(ndd);
|
|
old_num_resources = nsblk->num_resources;
|
|
nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
|
|
|
|
/*
|
|
* We need to loop over the old resources a few times, which seems a
|
|
* bit inefficient, but we need to know that we have the label
|
|
* space before we start mutating the tracking structures.
|
|
* Otherwise the recovery method of last resort for userspace is
|
|
* disable and re-enable the parent region.
|
|
*/
|
|
alloc = 0;
|
|
for_each_dpa_resource(ndd, res) {
|
|
if (strcmp(res->name, label_id.id) != 0)
|
|
continue;
|
|
if (!is_old_resource(res, old_res_list, old_num_resources))
|
|
alloc++;
|
|
}
|
|
|
|
victims = 0;
|
|
if (old_num_resources) {
|
|
/* convert old local-label-map to dimm-slot victim-map */
|
|
victim_map = kcalloc(BITS_TO_LONGS(nslot), sizeof(long),
|
|
GFP_KERNEL);
|
|
if (!victim_map)
|
|
return -ENOMEM;
|
|
|
|
/* mark unused labels for garbage collection */
|
|
for_each_clear_bit_le(slot, free, nslot) {
|
|
nd_label = nd_label_base(ndd) + slot;
|
|
memcpy(uuid, nd_label->uuid, NSLABEL_UUID_LEN);
|
|
if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) != 0)
|
|
continue;
|
|
res = to_resource(ndd, nd_label);
|
|
if (res && is_old_resource(res, old_res_list,
|
|
old_num_resources))
|
|
continue;
|
|
slot = to_slot(ndd, nd_label);
|
|
set_bit(slot, victim_map);
|
|
victims++;
|
|
}
|
|
}
|
|
|
|
/* don't allow updates that consume the last label */
|
|
if (nfree - alloc < 0 || nfree - alloc + victims < 1) {
|
|
dev_info(&nsblk->common.dev, "insufficient label space\n");
|
|
kfree(victim_map);
|
|
return -ENOSPC;
|
|
}
|
|
/* from here on we need to abort on error */
|
|
|
|
|
|
/* assign all resources to the namespace before writing the labels */
|
|
nsblk->res = NULL;
|
|
nsblk->num_resources = 0;
|
|
for_each_dpa_resource(ndd, res) {
|
|
if (strcmp(res->name, label_id.id) != 0)
|
|
continue;
|
|
if (!nsblk_add_resource(nd_region, ndd, nsblk, res->start)) {
|
|
rc = -ENOMEM;
|
|
goto abort;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < nsblk->num_resources; i++) {
|
|
size_t offset;
|
|
|
|
res = nsblk->res[i];
|
|
if (is_old_resource(res, old_res_list, old_num_resources))
|
|
continue; /* carry-over */
|
|
slot = nd_label_alloc_slot(ndd);
|
|
if (slot == UINT_MAX)
|
|
goto abort;
|
|
dev_dbg(ndd->dev, "%s: allocated: %d\n", __func__, slot);
|
|
|
|
nd_label = nd_label_base(ndd) + slot;
|
|
memset(nd_label, 0, sizeof(struct nd_namespace_label));
|
|
memcpy(nd_label->uuid, nsblk->uuid, NSLABEL_UUID_LEN);
|
|
if (nsblk->alt_name)
|
|
memcpy(nd_label->name, nsblk->alt_name,
|
|
NSLABEL_NAME_LEN);
|
|
nd_label->flags = __cpu_to_le32(NSLABEL_FLAG_LOCAL);
|
|
nd_label->nlabel = __cpu_to_le16(0); /* N/A */
|
|
nd_label->position = __cpu_to_le16(0); /* N/A */
|
|
nd_label->isetcookie = __cpu_to_le64(0); /* N/A */
|
|
nd_label->dpa = __cpu_to_le64(res->start);
|
|
nd_label->rawsize = __cpu_to_le64(resource_size(res));
|
|
nd_label->lbasize = __cpu_to_le64(nsblk->lbasize);
|
|
nd_label->slot = __cpu_to_le32(slot);
|
|
|
|
/* update label */
|
|
offset = nd_label_offset(ndd, nd_label);
|
|
rc = nvdimm_set_config_data(ndd, offset, nd_label,
|
|
sizeof(struct nd_namespace_label));
|
|
if (rc < 0)
|
|
goto abort;
|
|
}
|
|
|
|
/* free up now unused slots in the new index */
|
|
for_each_set_bit(slot, victim_map, victim_map ? nslot : 0) {
|
|
dev_dbg(ndd->dev, "%s: free: %d\n", __func__, slot);
|
|
nd_label_free_slot(ndd, slot);
|
|
}
|
|
|
|
/* update index */
|
|
rc = nd_label_write_index(ndd, ndd->ns_next,
|
|
nd_inc_seq(__le32_to_cpu(nsindex->seq)), 0);
|
|
if (rc)
|
|
goto abort;
|
|
|
|
/*
|
|
* Now that the on-dimm labels are up to date, fix up the tracking
|
|
* entries in nd_mapping->labels
|
|
*/
|
|
nlabel = 0;
|
|
for_each_label(l, nd_label, nd_mapping->labels) {
|
|
nlabel++;
|
|
memcpy(uuid, nd_label->uuid, NSLABEL_UUID_LEN);
|
|
if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) != 0)
|
|
continue;
|
|
nlabel--;
|
|
del_label(nd_mapping, l);
|
|
l--; /* retry with the new label at this index */
|
|
}
|
|
if (nlabel + nsblk->num_resources > num_labels) {
|
|
/*
|
|
* Bug, we can't end up with more resources than
|
|
* available labels
|
|
*/
|
|
WARN_ON_ONCE(1);
|
|
rc = -ENXIO;
|
|
goto out;
|
|
}
|
|
|
|
for_each_clear_bit_le(slot, free, nslot) {
|
|
nd_label = nd_label_base(ndd) + slot;
|
|
memcpy(uuid, nd_label->uuid, NSLABEL_UUID_LEN);
|
|
if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) != 0)
|
|
continue;
|
|
res = to_resource(ndd, nd_label);
|
|
res->flags &= ~DPA_RESOURCE_ADJUSTED;
|
|
dev_vdbg(&nsblk->common.dev, "assign label[%d] slot: %d\n",
|
|
l, slot);
|
|
nd_mapping->labels[l++] = nd_label;
|
|
}
|
|
nd_mapping->labels[l] = NULL;
|
|
|
|
out:
|
|
kfree(old_res_list);
|
|
kfree(victim_map);
|
|
return rc;
|
|
|
|
abort:
|
|
/*
|
|
* 1/ repair the allocated label bitmap in the index
|
|
* 2/ restore the resource list
|
|
*/
|
|
nd_label_copy(ndd, nsindex, to_current_namespace_index(ndd));
|
|
kfree(nsblk->res);
|
|
nsblk->res = old_res_list;
|
|
nsblk->num_resources = old_num_resources;
|
|
old_res_list = NULL;
|
|
goto out;
|
|
}
|
|
|
|
static int init_labels(struct nd_mapping *nd_mapping, int num_labels)
|
|
{
|
|
int i, l, old_num_labels = 0;
|
|
struct nd_namespace_index *nsindex;
|
|
struct nd_namespace_label *nd_label;
|
|
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
|
|
size_t size = (num_labels + 1) * sizeof(struct nd_namespace_label *);
|
|
|
|
for_each_label(l, nd_label, nd_mapping->labels)
|
|
old_num_labels++;
|
|
|
|
/*
|
|
* We need to preserve all the old labels for the mapping so
|
|
* they can be garbage collected after writing the new labels.
|
|
*/
|
|
if (num_labels > old_num_labels) {
|
|
struct nd_namespace_label **labels;
|
|
|
|
labels = krealloc(nd_mapping->labels, size, GFP_KERNEL);
|
|
if (!labels)
|
|
return -ENOMEM;
|
|
nd_mapping->labels = labels;
|
|
}
|
|
if (!nd_mapping->labels)
|
|
return -ENOMEM;
|
|
|
|
for (i = old_num_labels; i <= num_labels; i++)
|
|
nd_mapping->labels[i] = NULL;
|
|
|
|
if (ndd->ns_current == -1 || ndd->ns_next == -1)
|
|
/* pass */;
|
|
else
|
|
return max(num_labels, old_num_labels);
|
|
|
|
nsindex = to_namespace_index(ndd, 0);
|
|
memset(nsindex, 0, ndd->nsarea.config_size);
|
|
for (i = 0; i < 2; i++) {
|
|
int rc = nd_label_write_index(ndd, i, i*2, ND_NSINDEX_INIT);
|
|
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
ndd->ns_next = 1;
|
|
ndd->ns_current = 0;
|
|
|
|
return max(num_labels, old_num_labels);
|
|
}
|
|
|
|
static int del_labels(struct nd_mapping *nd_mapping, u8 *uuid)
|
|
{
|
|
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
|
|
struct nd_namespace_label *nd_label;
|
|
struct nd_namespace_index *nsindex;
|
|
u8 label_uuid[NSLABEL_UUID_LEN];
|
|
int l, num_freed = 0;
|
|
unsigned long *free;
|
|
u32 nslot, slot;
|
|
|
|
if (!uuid)
|
|
return 0;
|
|
|
|
/* no index || no labels == nothing to delete */
|
|
if (!preamble_next(ndd, &nsindex, &free, &nslot)
|
|
|| !nd_mapping->labels)
|
|
return 0;
|
|
|
|
for_each_label(l, nd_label, nd_mapping->labels) {
|
|
memcpy(label_uuid, nd_label->uuid, NSLABEL_UUID_LEN);
|
|
if (memcmp(label_uuid, uuid, NSLABEL_UUID_LEN) != 0)
|
|
continue;
|
|
slot = to_slot(ndd, nd_label);
|
|
nd_label_free_slot(ndd, slot);
|
|
dev_dbg(ndd->dev, "%s: free: %d\n", __func__, slot);
|
|
del_label(nd_mapping, l);
|
|
num_freed++;
|
|
l--; /* retry with new label at this index */
|
|
}
|
|
|
|
if (num_freed > l) {
|
|
/*
|
|
* num_freed will only ever be > l when we delete the last
|
|
* label
|
|
*/
|
|
kfree(nd_mapping->labels);
|
|
nd_mapping->labels = NULL;
|
|
dev_dbg(ndd->dev, "%s: no more labels\n", __func__);
|
|
}
|
|
|
|
return nd_label_write_index(ndd, ndd->ns_next,
|
|
nd_inc_seq(__le32_to_cpu(nsindex->seq)), 0);
|
|
}
|
|
|
|
int nd_pmem_namespace_label_update(struct nd_region *nd_region,
|
|
struct nd_namespace_pmem *nspm, resource_size_t size)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < nd_region->ndr_mappings; i++) {
|
|
struct nd_mapping *nd_mapping = &nd_region->mapping[i];
|
|
int rc;
|
|
|
|
if (size == 0) {
|
|
rc = del_labels(nd_mapping, nspm->uuid);
|
|
if (rc)
|
|
return rc;
|
|
continue;
|
|
}
|
|
|
|
rc = init_labels(nd_mapping, 1);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
rc = __pmem_label_update(nd_region, nd_mapping, nspm, i);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int nd_blk_namespace_label_update(struct nd_region *nd_region,
|
|
struct nd_namespace_blk *nsblk, resource_size_t size)
|
|
{
|
|
struct nd_mapping *nd_mapping = &nd_region->mapping[0];
|
|
struct resource *res;
|
|
int count = 0;
|
|
|
|
if (size == 0)
|
|
return del_labels(nd_mapping, nsblk->uuid);
|
|
|
|
for_each_dpa_resource(to_ndd(nd_mapping), res)
|
|
count++;
|
|
|
|
count = init_labels(nd_mapping, count);
|
|
if (count < 0)
|
|
return count;
|
|
|
|
return __blk_label_update(nd_region, nd_mapping, nsblk, count);
|
|
}
|