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linux
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nvdimm
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btt_devs.c
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304 lines (253 loc) · 7.67 KB
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linux
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btt_devs.c
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/* * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. */ #include <linux/blkdev.h> #include <linux/device.h> #include <linux/genhd.h> #include <linux/sizes.h> #include <linux/slab.h> #include <linux/fs.h> #include <linux/mm.h> #include "nd-core.h" #include "btt.h" #include "nd.h" static void nd_btt_release(struct device *dev) { struct nd_region *nd_region = to_nd_region(dev->parent); struct nd_btt *nd_btt = to_nd_btt(dev); dev_dbg(dev, "%s\n", __func__); nd_detach_ndns(&nd_btt->dev, &nd_btt->ndns); ida_simple_remove(&nd_region->btt_ida, nd_btt->id); kfree(nd_btt->uuid); kfree(nd_btt); } static struct device_type nd_btt_device_type = { .name = "nd_btt", .release = nd_btt_release, }; bool is_nd_btt(struct device *dev) { return dev->type == &nd_btt_device_type; } EXPORT_SYMBOL(is_nd_btt); struct nd_btt *to_nd_btt(struct device *dev) { struct nd_btt *nd_btt = container_of(dev, struct nd_btt, dev); WARN_ON(!is_nd_btt(dev)); return nd_btt; } EXPORT_SYMBOL(to_nd_btt); static const unsigned long btt_lbasize_supported[] = { 512, 520, 528, 4096, 4104, 4160, 4224, 0 }; static ssize_t sector_size_show(struct device *dev, struct device_attribute *attr, char *buf) { struct nd_btt *nd_btt = to_nd_btt(dev); return nd_sector_size_show(nd_btt->lbasize, btt_lbasize_supported, buf); } static ssize_t sector_size_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct nd_btt *nd_btt = to_nd_btt(dev); ssize_t rc; device_lock(dev); nvdimm_bus_lock(dev); rc = nd_sector_size_store(dev, buf, &nd_btt->lbasize, btt_lbasize_supported); dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__, rc, buf, buf[len - 1] == '\n' ? "" : "\n"); nvdimm_bus_unlock(dev); device_unlock(dev); return rc ? rc : len; } static DEVICE_ATTR_RW(sector_size); static ssize_t uuid_show(struct device *dev, struct device_attribute *attr, char *buf) { struct nd_btt *nd_btt = to_nd_btt(dev); if (nd_btt->uuid) return sprintf(buf, "%pUb\n", nd_btt->uuid); return sprintf(buf, "\n"); } static ssize_t uuid_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct nd_btt *nd_btt = to_nd_btt(dev); ssize_t rc; device_lock(dev); rc = nd_uuid_store(dev, &nd_btt->uuid, buf, len); dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__, rc, buf, buf[len - 1] == '\n' ? "" : "\n"); device_unlock(dev); return rc ? rc : len; } static DEVICE_ATTR_RW(uuid); static ssize_t namespace_show(struct device *dev, struct device_attribute *attr, char *buf) { struct nd_btt *nd_btt = to_nd_btt(dev); ssize_t rc; nvdimm_bus_lock(dev); rc = sprintf(buf, "%s\n", nd_btt->ndns ? dev_name(&nd_btt->ndns->dev) : ""); nvdimm_bus_unlock(dev); return rc; } static ssize_t namespace_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct nd_btt *nd_btt = to_nd_btt(dev); ssize_t rc; device_lock(dev); nvdimm_bus_lock(dev); rc = nd_namespace_store(dev, &nd_btt->ndns, buf, len); dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__, rc, buf, buf[len - 1] == '\n' ? "" : "\n"); nvdimm_bus_unlock(dev); device_unlock(dev); return rc; } static DEVICE_ATTR_RW(namespace); static struct attribute *nd_btt_attributes[] = { &dev_attr_sector_size.attr, &dev_attr_namespace.attr, &dev_attr_uuid.attr, NULL, }; static struct attribute_group nd_btt_attribute_group = { .attrs = nd_btt_attributes, }; static const struct attribute_group *nd_btt_attribute_groups[] = { &nd_btt_attribute_group, &nd_device_attribute_group, &nd_numa_attribute_group, NULL, }; static struct device *__nd_btt_create(struct nd_region *nd_region, unsigned long lbasize, u8 *uuid, struct nd_namespace_common *ndns) { struct nd_btt *nd_btt; struct device *dev; nd_btt = kzalloc(sizeof(*nd_btt), GFP_KERNEL); if (!nd_btt) return NULL; nd_btt->id = ida_simple_get(&nd_region->btt_ida, 0, 0, GFP_KERNEL); if (nd_btt->id < 0) { kfree(nd_btt); return NULL; } nd_btt->lbasize = lbasize; if (uuid) uuid = kmemdup(uuid, 16, GFP_KERNEL); nd_btt->uuid = uuid; dev = &nd_btt->dev; dev_set_name(dev, "btt%d.%d", nd_region->id, nd_btt->id); dev->parent = &nd_region->dev; dev->type = &nd_btt_device_type; dev->groups = nd_btt_attribute_groups; device_initialize(&nd_btt->dev); if (ndns && !__nd_attach_ndns(&nd_btt->dev, ndns, &nd_btt->ndns)) { dev_dbg(&ndns->dev, "%s failed, already claimed by %s\n", __func__, dev_name(ndns->claim)); put_device(dev); return NULL; } return dev; } struct device *nd_btt_create(struct nd_region *nd_region) { struct device *dev = __nd_btt_create(nd_region, 0, NULL, NULL); if (dev) __nd_device_register(dev); return dev; } static bool uuid_is_null(u8 *uuid) { static const u8 null_uuid[16]; return (memcmp(uuid, null_uuid, 16) == 0); } /** * nd_btt_arena_is_valid - check if the metadata layout is valid * @nd_btt: device with BTT geometry and backing device info * @super: pointer to the arena's info block being tested * * Check consistency of the btt info block with itself by validating * the checksum, and with the parent namespace by verifying the * parent_uuid contained in the info block with the one supplied in. * * Returns: * false for an invalid info block, true for a valid one */ bool nd_btt_arena_is_valid(struct nd_btt *nd_btt, struct btt_sb *super) { const u8 *parent_uuid = nd_dev_to_uuid(&nd_btt->ndns->dev); u64 checksum; if (memcmp(super->signature, BTT_SIG, BTT_SIG_LEN) != 0) return false; if (!uuid_is_null(super->parent_uuid)) if (memcmp(super->parent_uuid, parent_uuid, 16) != 0) return false; checksum = le64_to_cpu(super->checksum); super->checksum = 0; if (checksum != nd_sb_checksum((struct nd_gen_sb *) super)) return false; super->checksum = cpu_to_le64(checksum); /* TODO: figure out action for this */ if ((le32_to_cpu(super->flags) & IB_FLAG_ERROR_MASK) != 0) dev_info(&nd_btt->dev, "Found arena with an error flag\n"); return true; } EXPORT_SYMBOL(nd_btt_arena_is_valid); static int __nd_btt_probe(struct nd_btt *nd_btt, struct nd_namespace_common *ndns, struct btt_sb *btt_sb) { if (!btt_sb || !ndns || !nd_btt) return -ENODEV; if (nvdimm_read_bytes(ndns, SZ_4K, btt_sb, sizeof(*btt_sb))) return -ENXIO; if (nvdimm_namespace_capacity(ndns) < SZ_16M) return -ENXIO; if (!nd_btt_arena_is_valid(nd_btt, btt_sb)) return -ENODEV; nd_btt->lbasize = le32_to_cpu(btt_sb->external_lbasize); nd_btt->uuid = kmemdup(btt_sb->uuid, 16, GFP_KERNEL); if (!nd_btt->uuid) return -ENOMEM; __nd_device_register(&nd_btt->dev); return 0; } int nd_btt_probe(struct device *dev, struct nd_namespace_common *ndns) { int rc; struct device *btt_dev; struct btt_sb *btt_sb; struct nd_region *nd_region = to_nd_region(ndns->dev.parent); if (ndns->force_raw) return -ENODEV; nvdimm_bus_lock(&ndns->dev); btt_dev = __nd_btt_create(nd_region, 0, NULL, ndns); nvdimm_bus_unlock(&ndns->dev); if (!btt_dev) return -ENOMEM; btt_sb = devm_kzalloc(dev, sizeof(*btt_sb), GFP_KERNEL); rc = __nd_btt_probe(to_nd_btt(btt_dev), ndns, btt_sb); dev_dbg(dev, "%s: btt: %s\n", __func__, rc == 0 ? dev_name(btt_dev) : "<none>"); if (rc < 0) { struct nd_btt *nd_btt = to_nd_btt(btt_dev); __nd_detach_ndns(btt_dev, &nd_btt->ndns); put_device(btt_dev); } return rc; } EXPORT_SYMBOL(nd_btt_probe);
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