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drivers/nvdimm/btt.c
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// SPDX-License-Identifier: GPL-2.0-only |
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/* * Block Translation Table * Copyright (c) 2014-2015, Intel Corporation. |
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*/ #include <linux/highmem.h> #include <linux/debugfs.h> #include <linux/blkdev.h> #include <linux/module.h> #include <linux/device.h> #include <linux/mutex.h> #include <linux/hdreg.h> #include <linux/genhd.h> #include <linux/sizes.h> #include <linux/ndctl.h> #include <linux/fs.h> #include <linux/nd.h> |
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#include <linux/backing-dev.h> |
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#include "btt.h" #include "nd.h" enum log_ent_request { LOG_NEW_ENT = 0, LOG_OLD_ENT }; |
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static struct device *to_dev(struct arena_info *arena) { return &arena->nd_btt->dev; } |
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static u64 adjust_initial_offset(struct nd_btt *nd_btt, u64 offset) { return offset + nd_btt->initial_offset; } |
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static int arena_read_bytes(struct arena_info *arena, resource_size_t offset, |
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void *buf, size_t n, unsigned long flags) |
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{ struct nd_btt *nd_btt = arena->nd_btt; struct nd_namespace_common *ndns = nd_btt->ndns; |
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/* arena offsets may be shifted from the base of the device */ |
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offset = adjust_initial_offset(nd_btt, offset); |
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return nvdimm_read_bytes(ndns, offset, buf, n, flags); |
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} static int arena_write_bytes(struct arena_info *arena, resource_size_t offset, |
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void *buf, size_t n, unsigned long flags) |
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{ struct nd_btt *nd_btt = arena->nd_btt; struct nd_namespace_common *ndns = nd_btt->ndns; |
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/* arena offsets may be shifted from the base of the device */ |
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offset = adjust_initial_offset(nd_btt, offset); |
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return nvdimm_write_bytes(ndns, offset, buf, n, flags); |
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} static int btt_info_write(struct arena_info *arena, struct btt_sb *super) { int ret; |
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/* * infooff and info2off should always be at least 512B aligned. * We rely on that to make sure rw_bytes does error clearing * correctly, so make sure that is the case. */ |
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dev_WARN_ONCE(to_dev(arena), !IS_ALIGNED(arena->infooff, 512), "arena->infooff: %#llx is unaligned ", arena->infooff); dev_WARN_ONCE(to_dev(arena), !IS_ALIGNED(arena->info2off, 512), "arena->info2off: %#llx is unaligned ", arena->info2off); |
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ret = arena_write_bytes(arena, arena->info2off, super, |
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sizeof(struct btt_sb), 0); |
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if (ret) return ret; return arena_write_bytes(arena, arena->infooff, super, |
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sizeof(struct btt_sb), 0); |
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} static int btt_info_read(struct arena_info *arena, struct btt_sb *super) { |
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return arena_read_bytes(arena, arena->infooff, super, |
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sizeof(struct btt_sb), 0); |
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} /* * 'raw' version of btt_map write * Assumptions: * mapping is in little-endian * mapping contains 'E' and 'Z' flags as desired */ |
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static int __btt_map_write(struct arena_info *arena, u32 lba, __le32 mapping, unsigned long flags) |
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{ u64 ns_off = arena->mapoff + (lba * MAP_ENT_SIZE); |
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if (unlikely(lba >= arena->external_nlba)) dev_err_ratelimited(to_dev(arena), "%s: lba %#x out of range (max: %#x) ", __func__, lba, arena->external_nlba); |
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return arena_write_bytes(arena, ns_off, &mapping, MAP_ENT_SIZE, flags); |
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} static int btt_map_write(struct arena_info *arena, u32 lba, u32 mapping, |
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u32 z_flag, u32 e_flag, unsigned long rwb_flags) |
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{ u32 ze; __le32 mapping_le; /* * This 'mapping' is supposed to be just the LBA mapping, without * any flags set, so strip the flag bits. */ |
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mapping = ent_lba(mapping); |
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ze = (z_flag << 1) + e_flag; switch (ze) { case 0: /* * We want to set neither of the Z or E flags, and * in the actual layout, this means setting the bit * positions of both to '1' to indicate a 'normal' * map entry */ mapping |= MAP_ENT_NORMAL; break; case 1: mapping |= (1 << MAP_ERR_SHIFT); break; case 2: mapping |= (1 << MAP_TRIM_SHIFT); break; default: /* * The case where Z and E are both sent in as '1' could be * construed as a valid 'normal' case, but we decide not to, * to avoid confusion */ |
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dev_err_ratelimited(to_dev(arena), "Invalid use of Z and E flags "); |
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return -EIO; } mapping_le = cpu_to_le32(mapping); |
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return __btt_map_write(arena, lba, mapping_le, rwb_flags); |
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} static int btt_map_read(struct arena_info *arena, u32 lba, u32 *mapping, |
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int *trim, int *error, unsigned long rwb_flags) |
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{ int ret; __le32 in; u32 raw_mapping, postmap, ze, z_flag, e_flag; u64 ns_off = arena->mapoff + (lba * MAP_ENT_SIZE); |
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if (unlikely(lba >= arena->external_nlba)) dev_err_ratelimited(to_dev(arena), "%s: lba %#x out of range (max: %#x) ", __func__, lba, arena->external_nlba); |
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ret = arena_read_bytes(arena, ns_off, &in, MAP_ENT_SIZE, rwb_flags); |
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if (ret) return ret; raw_mapping = le32_to_cpu(in); |
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z_flag = ent_z_flag(raw_mapping); e_flag = ent_e_flag(raw_mapping); |
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ze = (z_flag << 1) + e_flag; |
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postmap = ent_lba(raw_mapping); |
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/* Reuse the {z,e}_flag variables for *trim and *error */ z_flag = 0; e_flag = 0; switch (ze) { case 0: /* Initial state. Return postmap = premap */ *mapping = lba; break; case 1: *mapping = postmap; e_flag = 1; break; case 2: *mapping = postmap; z_flag = 1; break; case 3: *mapping = postmap; break; default: return -EIO; } if (trim) *trim = z_flag; if (error) *error = e_flag; return ret; } |
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static int btt_log_group_read(struct arena_info *arena, u32 lane, struct log_group *log) |
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{ |
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return arena_read_bytes(arena, |
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arena->logoff + (lane * LOG_GRP_SIZE), log, LOG_GRP_SIZE, 0); |
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} static struct dentry *debugfs_root; static void arena_debugfs_init(struct arena_info *a, struct dentry *parent, int idx) { char dirname[32]; struct dentry *d; /* If for some reason, parent bttN was not created, exit */ if (!parent) return; snprintf(dirname, 32, "arena%d", idx); d = debugfs_create_dir(dirname, parent); if (IS_ERR_OR_NULL(d)) return; a->debugfs_dir = d; debugfs_create_x64("size", S_IRUGO, d, &a->size); debugfs_create_x64("external_lba_start", S_IRUGO, d, &a->external_lba_start); debugfs_create_x32("internal_nlba", S_IRUGO, d, &a->internal_nlba); debugfs_create_u32("internal_lbasize", S_IRUGO, d, &a->internal_lbasize); debugfs_create_x32("external_nlba", S_IRUGO, d, &a->external_nlba); debugfs_create_u32("external_lbasize", S_IRUGO, d, &a->external_lbasize); debugfs_create_u32("nfree", S_IRUGO, d, &a->nfree); debugfs_create_u16("version_major", S_IRUGO, d, &a->version_major); debugfs_create_u16("version_minor", S_IRUGO, d, &a->version_minor); debugfs_create_x64("nextoff", S_IRUGO, d, &a->nextoff); debugfs_create_x64("infooff", S_IRUGO, d, &a->infooff); debugfs_create_x64("dataoff", S_IRUGO, d, &a->dataoff); debugfs_create_x64("mapoff", S_IRUGO, d, &a->mapoff); debugfs_create_x64("logoff", S_IRUGO, d, &a->logoff); debugfs_create_x64("info2off", S_IRUGO, d, &a->info2off); debugfs_create_x32("flags", S_IRUGO, d, &a->flags); |
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debugfs_create_u32("log_index_0", S_IRUGO, d, &a->log_index[0]); debugfs_create_u32("log_index_1", S_IRUGO, d, &a->log_index[1]); |
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} static void btt_debugfs_init(struct btt *btt) { int i = 0; struct arena_info *arena; btt->debugfs_dir = debugfs_create_dir(dev_name(&btt->nd_btt->dev), debugfs_root); if (IS_ERR_OR_NULL(btt->debugfs_dir)) return; list_for_each_entry(arena, &btt->arena_list, list) { arena_debugfs_init(arena, btt->debugfs_dir, i); i++; } } |
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static u32 log_seq(struct log_group *log, int log_idx) { return le32_to_cpu(log->ent[log_idx].seq); } |
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/* * This function accepts two log entries, and uses the * sequence number to find the 'older' entry. * It also updates the sequence number in this old entry to * make it the 'new' one if the mark_flag is set. * Finally, it returns which of the entries was the older one. * * TODO The logic feels a bit kludge-y. make it better.. */ |
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static int btt_log_get_old(struct arena_info *a, struct log_group *log) |
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{ |
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int idx0 = a->log_index[0]; int idx1 = a->log_index[1]; |
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int old; /* * the first ever time this is seen, the entry goes into [0] * the next time, the following logic works out to put this * (next) entry into [1] */ |
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if (log_seq(log, idx0) == 0) { log->ent[idx0].seq = cpu_to_le32(1); |
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return 0; } |
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if (log_seq(log, idx0) == log_seq(log, idx1)) |
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return -EINVAL; |
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if (log_seq(log, idx0) + log_seq(log, idx1) > 5) |
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return -EINVAL; |
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if (log_seq(log, idx0) < log_seq(log, idx1)) { if ((log_seq(log, idx1) - log_seq(log, idx0)) == 1) |
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old = 0; else old = 1; } else { |
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if ((log_seq(log, idx0) - log_seq(log, idx1)) == 1) |
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old = 1; else old = 0; } return old; } |
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/* * This function copies the desired (old/new) log entry into ent if * it is not NULL. It returns the sub-slot number (0 or 1) * where the desired log entry was found. Negative return values * indicate errors. */ static int btt_log_read(struct arena_info *arena, u32 lane, struct log_entry *ent, int old_flag) { int ret; int old_ent, ret_ent; |
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struct log_group log; |
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ret = btt_log_group_read(arena, lane, &log); |
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if (ret) return -EIO; |
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old_ent = btt_log_get_old(arena, &log); |
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if (old_ent < 0 || old_ent > 1) { |
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dev_err(to_dev(arena), |
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"log corruption (%d): lane %d seq [%d, %d] ", |
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old_ent, lane, log.ent[arena->log_index[0]].seq, log.ent[arena->log_index[1]].seq); |
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/* TODO set error state? */ return -EIO; } ret_ent = (old_flag ? old_ent : (1 - old_ent)); if (ent != NULL) |
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memcpy(ent, &log.ent[arena->log_index[ret_ent]], LOG_ENT_SIZE); |
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return ret_ent; } /* * This function commits a log entry to media * It does _not_ prepare the freelist entry for the next write * btt_flog_write is the wrapper for updating the freelist elements */ static int __btt_log_write(struct arena_info *arena, u32 lane, |
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u32 sub, struct log_entry *ent, unsigned long flags) |
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{ int ret; |
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u32 group_slot = arena->log_index[sub]; unsigned int log_half = LOG_ENT_SIZE / 2; |
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void *src = ent; |
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u64 ns_off; |
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|
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ns_off = arena->logoff + (lane * LOG_GRP_SIZE) + (group_slot * LOG_ENT_SIZE); |
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/* split the 16B write into atomic, durable halves */ |
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ret = arena_write_bytes(arena, ns_off, src, log_half, flags); |
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if (ret) return ret; ns_off += log_half; src += log_half; |
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return arena_write_bytes(arena, ns_off, src, log_half, flags); |
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} static int btt_flog_write(struct arena_info *arena, u32 lane, u32 sub, struct log_entry *ent) { int ret; |
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ret = __btt_log_write(arena, lane, sub, ent, NVDIMM_IO_ATOMIC); |
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if (ret) return ret; /* prepare the next free entry */ arena->freelist[lane].sub = 1 - arena->freelist[lane].sub; if (++(arena->freelist[lane].seq) == 4) arena->freelist[lane].seq = 1; |
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if (ent_e_flag(le32_to_cpu(ent->old_map))) |
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arena->freelist[lane].has_err = 1; |
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arena->freelist[lane].block = ent_lba(le32_to_cpu(ent->old_map)); |
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return ret; } /* * This function initializes the BTT map to the initial state, which is * all-zeroes, and indicates an identity mapping */ static int btt_map_init(struct arena_info *arena) { int ret = -EINVAL; void *zerobuf; size_t offset = 0; size_t chunk_size = SZ_2M; size_t mapsize = arena->logoff - arena->mapoff; zerobuf = kzalloc(chunk_size, GFP_KERNEL); if (!zerobuf) return -ENOMEM; |
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/* * mapoff should always be at least 512B aligned. We rely on that to * make sure rw_bytes does error clearing correctly, so make sure that * is the case. */ |
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dev_WARN_ONCE(to_dev(arena), !IS_ALIGNED(arena->mapoff, 512), "arena->mapoff: %#llx is unaligned ", arena->mapoff); |
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|
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while (mapsize) { size_t size = min(mapsize, chunk_size); |
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dev_WARN_ONCE(to_dev(arena), size < 512, |
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"chunk size: %#zx is unaligned ", size); |
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ret = arena_write_bytes(arena, arena->mapoff + offset, zerobuf, |
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size, 0); |
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if (ret) goto free; offset += size; mapsize -= size; cond_resched(); } free: kfree(zerobuf); return ret; } /* * This function initializes the BTT log with 'fake' entries pointing * to the initial reserved set of blocks as being free */ static int btt_log_init(struct arena_info *arena) { |
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size_t logsize = arena->info2off - arena->logoff; size_t chunk_size = SZ_4K, offset = 0; |
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struct log_entry ent; |
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void *zerobuf; |
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int ret; u32 i; |
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|
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zerobuf = kzalloc(chunk_size, GFP_KERNEL); if (!zerobuf) return -ENOMEM; /* * logoff should always be at least 512B aligned. We rely on that to * make sure rw_bytes does error clearing correctly, so make sure that * is the case. */ |
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dev_WARN_ONCE(to_dev(arena), !IS_ALIGNED(arena->logoff, 512), "arena->logoff: %#llx is unaligned ", arena->logoff); |
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while (logsize) { size_t size = min(logsize, chunk_size); |
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dev_WARN_ONCE(to_dev(arena), size < 512, |
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"chunk size: %#zx is unaligned ", size); |
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ret = arena_write_bytes(arena, arena->logoff + offset, zerobuf, size, 0); if (ret) goto free; offset += size; logsize -= size; cond_resched(); } |
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for (i = 0; i < arena->nfree; i++) { |
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ent.lba = cpu_to_le32(i); ent.old_map = cpu_to_le32(arena->external_nlba + i); ent.new_map = cpu_to_le32(arena->external_nlba + i); ent.seq = cpu_to_le32(LOG_SEQ_INIT); ret = __btt_log_write(arena, i, 0, &ent, 0); |
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if (ret) |
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goto free; |
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} |
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free: kfree(zerobuf); return ret; |
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} |
d9b83c756 libnvdimm, btt: r... |
488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 |
static u64 to_namespace_offset(struct arena_info *arena, u64 lba) { return arena->dataoff + ((u64)lba * arena->internal_lbasize); } static int arena_clear_freelist_error(struct arena_info *arena, u32 lane) { int ret = 0; if (arena->freelist[lane].has_err) { void *zero_page = page_address(ZERO_PAGE(0)); u32 lba = arena->freelist[lane].block; u64 nsoff = to_namespace_offset(arena, lba); unsigned long len = arena->sector_size; mutex_lock(&arena->err_lock); while (len) { unsigned long chunk = min(len, PAGE_SIZE); ret = arena_write_bytes(arena, nsoff, zero_page, chunk, 0); if (ret) break; len -= chunk; nsoff += chunk; if (len == 0) arena->freelist[lane].has_err = 0; } mutex_unlock(&arena->err_lock); } return ret; } |
5212e11fd nd_btt: atomic se... |
521 522 |
static int btt_freelist_init(struct arena_info *arena) { |
2f8c90111 libnvdimm/btt: Re... |
523 |
int new, ret; |
2f8c90111 libnvdimm/btt: Re... |
524 |
struct log_entry log_new; |
9dedc73a4 libnvdimm/btt: Fi... |
525 |
u32 i, map_entry, log_oldmap, log_newmap; |
5212e11fd nd_btt: atomic se... |
526 527 528 529 530 531 532 |
arena->freelist = kcalloc(arena->nfree, sizeof(struct free_entry), GFP_KERNEL); if (!arena->freelist) return -ENOMEM; for (i = 0; i < arena->nfree; i++) { |
5212e11fd nd_btt: atomic se... |
533 534 535 |
new = btt_log_read(arena, i, &log_new, LOG_NEW_ENT); if (new < 0) return new; |
9dedc73a4 libnvdimm/btt: Fi... |
536 537 538 |
/* old and new map entries with any flags stripped out */ log_oldmap = ent_lba(le32_to_cpu(log_new.old_map)); log_newmap = ent_lba(le32_to_cpu(log_new.new_map)); |
5212e11fd nd_btt: atomic se... |
539 540 541 |
/* sub points to the next one to be overwritten */ arena->freelist[i].sub = 1 - new; arena->freelist[i].seq = nd_inc_seq(le32_to_cpu(log_new.seq)); |
9dedc73a4 libnvdimm/btt: Fi... |
542 |
arena->freelist[i].block = log_oldmap; |
5212e11fd nd_btt: atomic se... |
543 |
|
d9b83c756 libnvdimm, btt: r... |
544 545 546 547 |
/* * FIXME: if error clearing fails during init, we want to make * the BTT read-only */ |
86aa66687 libnvdimm: Fix en... |
548 549 |
if (ent_e_flag(le32_to_cpu(log_new.old_map)) && !ent_normal(le32_to_cpu(log_new.old_map))) { |
9dedc73a4 libnvdimm/btt: Fi... |
550 |
arena->freelist[i].has_err = 1; |
d9b83c756 libnvdimm, btt: r... |
551 552 |
ret = arena_clear_freelist_error(arena, i); if (ret) |
86652d2eb libnvdimm, btt: c... |
553 554 555 |
dev_err_ratelimited(to_dev(arena), "Unable to clear known errors "); |
d9b83c756 libnvdimm, btt: r... |
556 |
} |
5212e11fd nd_btt: atomic se... |
557 |
/* This implies a newly created or untouched flog entry */ |
9dedc73a4 libnvdimm/btt: Fi... |
558 |
if (log_oldmap == log_newmap) |
5212e11fd nd_btt: atomic se... |
559 560 561 562 |
continue; /* Check if map recovery is needed */ ret = btt_map_read(arena, le32_to_cpu(log_new.lba), &map_entry, |
3ae3d67ba libnvdimm: add an... |
563 |
NULL, NULL, 0); |
5212e11fd nd_btt: atomic se... |
564 565 |
if (ret) return ret; |
9dedc73a4 libnvdimm/btt: Fi... |
566 567 568 569 570 571 572 573 574 |
/* * The map_entry from btt_read_map is stripped of any flag bits, * so use the stripped out versions from the log as well for * testing whether recovery is needed. For restoration, use the * 'raw' version of the log entries as that captured what we * were going to write originally. */ if ((log_newmap != map_entry) && (log_oldmap == map_entry)) { |
5212e11fd nd_btt: atomic se... |
575 576 577 578 579 |
/* * Last transaction wrote the flog, but wasn't able * to complete the map write. So fix up the map. */ ret = btt_map_write(arena, le32_to_cpu(log_new.lba), |
3ae3d67ba libnvdimm: add an... |
580 |
le32_to_cpu(log_new.new_map), 0, 0, 0); |
5212e11fd nd_btt: atomic se... |
581 582 583 |
if (ret) return ret; } |
5212e11fd nd_btt: atomic se... |
584 585 586 587 |
} return 0; } |
24e3a7fb6 libnvdimm, btt: F... |
588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 |
static bool ent_is_padding(struct log_entry *ent) { return (ent->lba == 0) && (ent->old_map == 0) && (ent->new_map == 0) && (ent->seq == 0); } /* * Detecting valid log indices: We read a log group (see the comments in btt.h * for a description of a 'log_group' and its 'slots'), and iterate over its * four slots. We expect that a padding slot will be all-zeroes, and use this * to detect a padding slot vs. an actual entry. * * If a log_group is in the initial state, i.e. hasn't been used since the * creation of this BTT layout, it will have three of the four slots with * zeroes. We skip over these log_groups for the detection of log_index. If * all log_groups are in the initial state (i.e. the BTT has never been * written to), it is safe to assume the 'new format' of log entries in slots * (0, 1). */ static int log_set_indices(struct arena_info *arena) { bool idx_set = false, initial_state = true; int ret, log_index[2] = {-1, -1}; u32 i, j, next_idx = 0; struct log_group log; u32 pad_count = 0; for (i = 0; i < arena->nfree; i++) { ret = btt_log_group_read(arena, i, &log); if (ret < 0) return ret; for (j = 0; j < 4; j++) { if (!idx_set) { if (ent_is_padding(&log.ent[j])) { pad_count++; continue; } else { /* Skip if index has been recorded */ if ((next_idx == 1) && (j == log_index[0])) continue; /* valid entry, record index */ log_index[next_idx] = j; next_idx++; } if (next_idx == 2) { /* two valid entries found */ idx_set = true; } else if (next_idx > 2) { /* too many valid indices */ return -ENXIO; } } else { /* * once the indices have been set, just verify * that all subsequent log groups are either in * their initial state or follow the same * indices. */ if (j == log_index[0]) { /* entry must be 'valid' */ if (ent_is_padding(&log.ent[j])) return -ENXIO; } else if (j == log_index[1]) { ; /* * log_index[1] can be padding if the * lane never got used and it is still * in the initial state (three 'padding' * entries) */ } else { /* entry must be invalid (padding) */ if (!ent_is_padding(&log.ent[j])) return -ENXIO; } } } /* * If any of the log_groups have more than one valid, * non-padding entry, then the we are no longer in the * initial_state */ if (pad_count < 3) initial_state = false; pad_count = 0; } if (!initial_state && !idx_set) return -ENXIO; /* * If all the entries in the log were in the initial state, * assume new padding scheme */ if (initial_state) log_index[1] = 1; /* * Only allow the known permutations of log/padding indices, * i.e. (0, 1), and (0, 2) */ if ((log_index[0] == 0) && ((log_index[1] == 1) || (log_index[1] == 2))) ; /* known index possibilities */ else { dev_err(to_dev(arena), "Found an unknown padding scheme "); return -ENXIO; } arena->log_index[0] = log_index[0]; arena->log_index[1] = log_index[1]; dev_dbg(to_dev(arena), "log_index_0 = %d ", log_index[0]); dev_dbg(to_dev(arena), "log_index_1 = %d ", log_index[1]); return 0; } |
5212e11fd nd_btt: atomic se... |
707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 |
static int btt_rtt_init(struct arena_info *arena) { arena->rtt = kcalloc(arena->nfree, sizeof(u32), GFP_KERNEL); if (arena->rtt == NULL) return -ENOMEM; return 0; } static int btt_maplocks_init(struct arena_info *arena) { u32 i; arena->map_locks = kcalloc(arena->nfree, sizeof(struct aligned_lock), GFP_KERNEL); if (!arena->map_locks) return -ENOMEM; for (i = 0; i < arena->nfree; i++) spin_lock_init(&arena->map_locks[i].lock); return 0; } static struct arena_info *alloc_arena(struct btt *btt, size_t size, size_t start, size_t arena_off) { struct arena_info *arena; u64 logsize, mapsize, datasize; u64 available = size; arena = kzalloc(sizeof(struct arena_info), GFP_KERNEL); if (!arena) return NULL; arena->nd_btt = btt->nd_btt; |
758920045 libnvdimm, btt: c... |
742 |
arena->sector_size = btt->sector_size; |
d08cd5e0e libnvdimm, btt: f... |
743 |
mutex_init(&arena->err_lock); |
5212e11fd nd_btt: atomic se... |
744 745 746 747 748 749 750 751 752 753 |
if (!size) return arena; arena->size = size; arena->external_lba_start = start; arena->external_lbasize = btt->lbasize; arena->internal_lbasize = roundup(arena->external_lbasize, INT_LBASIZE_ALIGNMENT); arena->nfree = BTT_DEFAULT_NFREE; |
14e494542 libnvdimm, btt: B... |
754 755 |
arena->version_major = btt->nd_btt->version_major; arena->version_minor = btt->nd_btt->version_minor; |
5212e11fd nd_btt: atomic se... |
756 757 758 759 760 761 762 763 |
if (available % BTT_PG_SIZE) available -= (available % BTT_PG_SIZE); /* Two pages are reserved for the super block and its copy */ available -= 2 * BTT_PG_SIZE; /* The log takes a fixed amount of space based on nfree */ |
24e3a7fb6 libnvdimm, btt: F... |
764 |
logsize = roundup(arena->nfree * LOG_GRP_SIZE, BTT_PG_SIZE); |
5212e11fd nd_btt: atomic se... |
765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 |
available -= logsize; /* Calculate optimal split between map and data area */ arena->internal_nlba = div_u64(available - BTT_PG_SIZE, arena->internal_lbasize + MAP_ENT_SIZE); arena->external_nlba = arena->internal_nlba - arena->nfree; mapsize = roundup((arena->external_nlba * MAP_ENT_SIZE), BTT_PG_SIZE); datasize = available - mapsize; /* 'Absolute' values, relative to start of storage space */ arena->infooff = arena_off; arena->dataoff = arena->infooff + BTT_PG_SIZE; arena->mapoff = arena->dataoff + datasize; arena->logoff = arena->mapoff + mapsize; arena->info2off = arena->logoff + logsize; |
24e3a7fb6 libnvdimm, btt: F... |
781 782 783 784 |
/* Default log indices are (0,1) */ arena->log_index[0] = 0; arena->log_index[1] = 1; |
5212e11fd nd_btt: atomic se... |
785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 |
return arena; } static void free_arenas(struct btt *btt) { struct arena_info *arena, *next; list_for_each_entry_safe(arena, next, &btt->arena_list, list) { list_del(&arena->list); kfree(arena->rtt); kfree(arena->map_locks); kfree(arena->freelist); debugfs_remove_recursive(arena->debugfs_dir); kfree(arena); } } /* |
5212e11fd nd_btt: atomic se... |
803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 |
* This function reads an existing valid btt superblock and * populates the corresponding arena_info struct */ static void parse_arena_meta(struct arena_info *arena, struct btt_sb *super, u64 arena_off) { arena->internal_nlba = le32_to_cpu(super->internal_nlba); arena->internal_lbasize = le32_to_cpu(super->internal_lbasize); arena->external_nlba = le32_to_cpu(super->external_nlba); arena->external_lbasize = le32_to_cpu(super->external_lbasize); arena->nfree = le32_to_cpu(super->nfree); arena->version_major = le16_to_cpu(super->version_major); arena->version_minor = le16_to_cpu(super->version_minor); arena->nextoff = (super->nextoff == 0) ? 0 : (arena_off + le64_to_cpu(super->nextoff)); arena->infooff = arena_off; arena->dataoff = arena_off + le64_to_cpu(super->dataoff); arena->mapoff = arena_off + le64_to_cpu(super->mapoff); arena->logoff = arena_off + le64_to_cpu(super->logoff); arena->info2off = arena_off + le64_to_cpu(super->info2off); |
5e3294062 libnvdimm, btt: s... |
824 825 826 |
arena->size = (le64_to_cpu(super->nextoff) > 0) ? (le64_to_cpu(super->nextoff)) : (arena->info2off - arena->infooff + BTT_PG_SIZE); |
5212e11fd nd_btt: atomic se... |
827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 |
arena->flags = le32_to_cpu(super->flags); } static int discover_arenas(struct btt *btt) { int ret = 0; struct arena_info *arena; struct btt_sb *super; size_t remaining = btt->rawsize; u64 cur_nlba = 0; size_t cur_off = 0; int num_arenas = 0; super = kzalloc(sizeof(*super), GFP_KERNEL); if (!super) return -ENOMEM; while (remaining) { /* Alloc memory for arena */ arena = alloc_arena(btt, 0, 0, 0); if (!arena) { ret = -ENOMEM; goto out_super; } arena->infooff = cur_off; ret = btt_info_read(arena, super); if (ret) goto out; |
ab45e7632 libnvdimm, btt: c... |
857 |
if (!nd_btt_arena_is_valid(btt->nd_btt, super)) { |
5212e11fd nd_btt: atomic se... |
858 859 860 861 862 863 |
if (remaining == btt->rawsize) { btt->init_state = INIT_NOTFOUND; dev_info(to_dev(arena), "No existing arenas "); goto out; } else { |
e6be2dcbe libnvdimm, btt: c... |
864 |
dev_err(to_dev(arena), |
5212e11fd nd_btt: atomic se... |
865 866 867 868 869 870 871 872 873 |
"Found corrupted metadata! "); ret = -ENODEV; goto out; } } arena->external_lba_start = cur_nlba; parse_arena_meta(arena, super, cur_off); |
24e3a7fb6 libnvdimm, btt: F... |
874 875 876 877 878 879 880 |
ret = log_set_indices(arena); if (ret) { dev_err(to_dev(arena), "Unable to deduce log/padding indices "); goto out; } |
5212e11fd nd_btt: atomic se... |
881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 |
ret = btt_freelist_init(arena); if (ret) goto out; ret = btt_rtt_init(arena); if (ret) goto out; ret = btt_maplocks_init(arena); if (ret) goto out; list_add_tail(&arena->list, &btt->arena_list); remaining -= arena->size; cur_off += arena->size; cur_nlba += arena->external_nlba; num_arenas++; if (arena->nextoff == 0) break; } btt->num_arenas = num_arenas; btt->nlba = cur_nlba; btt->init_state = INIT_READY; kfree(super); return ret; out: kfree(arena); free_arenas(btt); out_super: kfree(super); return ret; } static int create_arenas(struct btt *btt) { size_t remaining = btt->rawsize; size_t cur_off = 0; while (remaining) { struct arena_info *arena; size_t arena_size = min_t(u64, ARENA_MAX_SIZE, remaining); remaining -= arena_size; if (arena_size < ARENA_MIN_SIZE) break; arena = alloc_arena(btt, arena_size, btt->nlba, cur_off); if (!arena) { free_arenas(btt); return -ENOMEM; } btt->nlba += arena->external_nlba; if (remaining >= ARENA_MIN_SIZE) arena->nextoff = arena->size; else arena->nextoff = 0; cur_off += arena_size; list_add_tail(&arena->list, &btt->arena_list); } return 0; } /* * This function completes arena initialization by writing * all the metadata. * It is only called for an uninitialized arena when a write * to that arena occurs for the first time. */ |
fbde1414a libnvdimm, btt: c... |
954 |
static int btt_arena_write_layout(struct arena_info *arena) |
5212e11fd nd_btt: atomic se... |
955 956 |
{ int ret; |
e1455744b libnvdimm, pfn: '... |
957 |
u64 sum; |
5212e11fd nd_btt: atomic se... |
958 |
struct btt_sb *super; |
fbde1414a libnvdimm, btt: c... |
959 |
struct nd_btt *nd_btt = arena->nd_btt; |
6ec689542 libnvdimm, btt: w... |
960 |
const u8 *parent_uuid = nd_dev_to_uuid(&nd_btt->ndns->dev); |
5212e11fd nd_btt: atomic se... |
961 962 963 964 965 966 967 968 969 970 971 972 973 974 |
ret = btt_map_init(arena); if (ret) return ret; ret = btt_log_init(arena); if (ret) return ret; super = kzalloc(sizeof(struct btt_sb), GFP_NOIO); if (!super) return -ENOMEM; strncpy(super->signature, BTT_SIG, BTT_SIG_LEN); |
fbde1414a libnvdimm, btt: c... |
975 |
memcpy(super->uuid, nd_btt->uuid, 16); |
6ec689542 libnvdimm, btt: w... |
976 |
memcpy(super->parent_uuid, parent_uuid, 16); |
5212e11fd nd_btt: atomic se... |
977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 |
super->flags = cpu_to_le32(arena->flags); super->version_major = cpu_to_le16(arena->version_major); super->version_minor = cpu_to_le16(arena->version_minor); super->external_lbasize = cpu_to_le32(arena->external_lbasize); super->external_nlba = cpu_to_le32(arena->external_nlba); super->internal_lbasize = cpu_to_le32(arena->internal_lbasize); super->internal_nlba = cpu_to_le32(arena->internal_nlba); super->nfree = cpu_to_le32(arena->nfree); super->infosize = cpu_to_le32(sizeof(struct btt_sb)); super->nextoff = cpu_to_le64(arena->nextoff); /* * Subtract arena->infooff (arena start) so numbers are relative * to 'this' arena */ super->dataoff = cpu_to_le64(arena->dataoff - arena->infooff); super->mapoff = cpu_to_le64(arena->mapoff - arena->infooff); super->logoff = cpu_to_le64(arena->logoff - arena->infooff); super->info2off = cpu_to_le64(arena->info2off - arena->infooff); super->flags = 0; |
e1455744b libnvdimm, pfn: '... |
997 998 |
sum = nd_sb_checksum((struct nd_gen_sb *) super); super->checksum = cpu_to_le64(sum); |
5212e11fd nd_btt: atomic se... |
999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 |
ret = btt_info_write(arena, super); kfree(super); return ret; } /* * This function completes the initialization for the BTT namespace * such that it is ready to accept IOs */ static int btt_meta_init(struct btt *btt) { int ret = 0; struct arena_info *arena; mutex_lock(&btt->init_lock); list_for_each_entry(arena, &btt->arena_list, list) { |
fbde1414a libnvdimm, btt: c... |
1017 |
ret = btt_arena_write_layout(arena); |
5212e11fd nd_btt: atomic se... |
1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 |
if (ret) goto unlock; ret = btt_freelist_init(arena); if (ret) goto unlock; ret = btt_rtt_init(arena); if (ret) goto unlock; ret = btt_maplocks_init(arena); if (ret) goto unlock; } btt->init_state = INIT_READY; unlock: mutex_unlock(&btt->init_lock); return ret; } |
41cd8b70c libnvdimm, btt: a... |
1040 1041 1042 1043 |
static u32 btt_meta_size(struct btt *btt) { return btt->lbasize - btt->sector_size; } |
5212e11fd nd_btt: atomic se... |
1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 |
/* * This function calculates the arena in which the given LBA lies * by doing a linear walk. This is acceptable since we expect only * a few arenas. If we have backing devices that get much larger, * we can construct a balanced binary tree of arenas at init time * so that this range search becomes faster. */ static int lba_to_arena(struct btt *btt, sector_t sector, __u32 *premap, struct arena_info **arena) { struct arena_info *arena_list; __u64 lba = div_u64(sector << SECTOR_SHIFT, btt->sector_size); list_for_each_entry(arena_list, &btt->arena_list, list) { if (lba < arena_list->external_nlba) { *arena = arena_list; *premap = lba; return 0; } lba -= arena_list->external_nlba; } return -EIO; } /* * The following (lock_map, unlock_map) are mostly just to improve * readability, since they index into an array of locks */ static void lock_map(struct arena_info *arena, u32 premap) __acquires(&arena->map_locks[idx].lock) { u32 idx = (premap * MAP_ENT_SIZE / L1_CACHE_BYTES) % arena->nfree; spin_lock(&arena->map_locks[idx].lock); } static void unlock_map(struct arena_info *arena, u32 premap) __releases(&arena->map_locks[idx].lock) { u32 idx = (premap * MAP_ENT_SIZE / L1_CACHE_BYTES) % arena->nfree; spin_unlock(&arena->map_locks[idx].lock); } |
5212e11fd nd_btt: atomic se... |
1088 1089 1090 1091 1092 1093 |
static int btt_data_read(struct arena_info *arena, struct page *page, unsigned int off, u32 lba, u32 len) { int ret; u64 nsoff = to_namespace_offset(arena, lba); void *mem = kmap_atomic(page); |
3ae3d67ba libnvdimm: add an... |
1094 |
ret = arena_read_bytes(arena, nsoff, mem + off, len, NVDIMM_IO_ATOMIC); |
5212e11fd nd_btt: atomic se... |
1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 |
kunmap_atomic(mem); return ret; } static int btt_data_write(struct arena_info *arena, u32 lba, struct page *page, unsigned int off, u32 len) { int ret; u64 nsoff = to_namespace_offset(arena, lba); void *mem = kmap_atomic(page); |
3ae3d67ba libnvdimm: add an... |
1106 |
ret = arena_write_bytes(arena, nsoff, mem + off, len, NVDIMM_IO_ATOMIC); |
5212e11fd nd_btt: atomic se... |
1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 |
kunmap_atomic(mem); return ret; } static void zero_fill_data(struct page *page, unsigned int off, u32 len) { void *mem = kmap_atomic(page); memset(mem + off, 0, len); kunmap_atomic(mem); } |
41cd8b70c libnvdimm, btt: a... |
1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 |
#ifdef CONFIG_BLK_DEV_INTEGRITY static int btt_rw_integrity(struct btt *btt, struct bio_integrity_payload *bip, struct arena_info *arena, u32 postmap, int rw) { unsigned int len = btt_meta_size(btt); u64 meta_nsoff; int ret = 0; if (bip == NULL) return 0; meta_nsoff = to_namespace_offset(arena, postmap) + btt->sector_size; while (len) { unsigned int cur_len; struct bio_vec bv; void *mem; bv = bvec_iter_bvec(bip->bip_vec, bip->bip_iter); /* * The 'bv' obtained from bvec_iter_bvec has its .bv_len and * .bv_offset already adjusted for iter->bi_bvec_done, and we * can use those directly */ cur_len = min(len, bv.bv_len); mem = kmap_atomic(bv.bv_page); if (rw) ret = arena_write_bytes(arena, meta_nsoff, |
3ae3d67ba libnvdimm: add an... |
1148 1149 |
mem + bv.bv_offset, cur_len, NVDIMM_IO_ATOMIC); |
41cd8b70c libnvdimm, btt: a... |
1150 1151 |
else ret = arena_read_bytes(arena, meta_nsoff, |
3ae3d67ba libnvdimm: add an... |
1152 1153 |
mem + bv.bv_offset, cur_len, NVDIMM_IO_ATOMIC); |
41cd8b70c libnvdimm, btt: a... |
1154 1155 1156 1157 1158 1159 1160 |
kunmap_atomic(mem); if (ret) return ret; len -= cur_len; meta_nsoff += cur_len; |
b1fb2c52b block: guard bvec... |
1161 1162 |
if (!bvec_iter_advance(bip->bip_vec, &bip->bip_iter, cur_len)) return -EIO; |
41cd8b70c libnvdimm, btt: a... |
1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 |
} return ret; } #else /* CONFIG_BLK_DEV_INTEGRITY */ static int btt_rw_integrity(struct btt *btt, struct bio_integrity_payload *bip, struct arena_info *arena, u32 postmap, int rw) { return 0; } #endif static int btt_read_pg(struct btt *btt, struct bio_integrity_payload *bip, struct page *page, unsigned int off, sector_t sector, unsigned int len) |
5212e11fd nd_btt: atomic se... |
1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 |
{ int ret = 0; int t_flag, e_flag; struct arena_info *arena = NULL; u32 lane = 0, premap, postmap; while (len) { u32 cur_len; lane = nd_region_acquire_lane(btt->nd_region); ret = lba_to_arena(btt, sector, &premap, &arena); if (ret) goto out_lane; cur_len = min(btt->sector_size, len); |
3ae3d67ba libnvdimm: add an... |
1195 1196 |
ret = btt_map_read(arena, premap, &postmap, &t_flag, &e_flag, NVDIMM_IO_ATOMIC); |
5212e11fd nd_btt: atomic se... |
1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 |
if (ret) goto out_lane; /* * We loop to make sure that the post map LBA didn't change * from under us between writing the RTT and doing the actual * read. */ while (1) { u32 new_map; |
1398199d8 libnvdimm, btt: e... |
1207 |
int new_t, new_e; |
5212e11fd nd_btt: atomic se... |
1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 |
if (t_flag) { zero_fill_data(page, off, cur_len); goto out_lane; } if (e_flag) { ret = -EIO; goto out_lane; } arena->rtt[lane] = RTT_VALID | postmap; /* * Barrier to make sure this write is not reordered * to do the verification map_read before the RTT store */ barrier(); |
1398199d8 libnvdimm, btt: e... |
1225 1226 |
ret = btt_map_read(arena, premap, &new_map, &new_t, &new_e, NVDIMM_IO_ATOMIC); |
5212e11fd nd_btt: atomic se... |
1227 1228 |
if (ret) goto out_rtt; |
1398199d8 libnvdimm, btt: e... |
1229 1230 |
if ((postmap == new_map) && (t_flag == new_t) && (e_flag == new_e)) |
5212e11fd nd_btt: atomic se... |
1231 1232 1233 |
break; postmap = new_map; |
1398199d8 libnvdimm, btt: e... |
1234 1235 |
t_flag = new_t; e_flag = new_e; |
5212e11fd nd_btt: atomic se... |
1236 1237 1238 |
} ret = btt_data_read(arena, page, off, postmap, cur_len); |
d9b83c756 libnvdimm, btt: r... |
1239 |
if (ret) { |
d9b83c756 libnvdimm, btt: r... |
1240 |
/* Media error - set the e_flag */ |
4e24e37d5 libnvdimm/btt: fi... |
1241 1242 1243 1244 1245 |
if (btt_map_write(arena, premap, postmap, 0, 1, NVDIMM_IO_ATOMIC)) dev_warn_ratelimited(to_dev(arena), "Error persistently tracking bad blocks at %#x ", premap); |
5212e11fd nd_btt: atomic se... |
1246 |
goto out_rtt; |
d9b83c756 libnvdimm, btt: r... |
1247 |
} |
5212e11fd nd_btt: atomic se... |
1248 |
|
41cd8b70c libnvdimm, btt: a... |
1249 1250 1251 1252 1253 |
if (bip) { ret = btt_rw_integrity(btt, bip, arena, postmap, READ); if (ret) goto out_rtt; } |
5212e11fd nd_btt: atomic se... |
1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 |
arena->rtt[lane] = RTT_INVALID; nd_region_release_lane(btt->nd_region, lane); len -= cur_len; off += cur_len; sector += btt->sector_size >> SECTOR_SHIFT; } return 0; out_rtt: arena->rtt[lane] = RTT_INVALID; out_lane: nd_region_release_lane(btt->nd_region, lane); return ret; } |
d9b83c756 libnvdimm, btt: r... |
1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 |
/* * Normally, arena_{read,write}_bytes will take care of the initial offset * adjustment, but in the case of btt_is_badblock, where we query is_bad_pmem, * we need the final, raw namespace offset here */ static bool btt_is_badblock(struct btt *btt, struct arena_info *arena, u32 postmap) { u64 nsoff = adjust_initial_offset(arena->nd_btt, to_namespace_offset(arena, postmap)); sector_t phys_sector = nsoff >> 9; return is_bad_pmem(btt->phys_bb, phys_sector, arena->internal_lbasize); } |
41cd8b70c libnvdimm, btt: a... |
1284 1285 1286 |
static int btt_write_pg(struct btt *btt, struct bio_integrity_payload *bip, sector_t sector, struct page *page, unsigned int off, unsigned int len) |
5212e11fd nd_btt: atomic se... |
1287 1288 1289 1290 1291 1292 1293 1294 1295 |
{ int ret = 0; struct arena_info *arena = NULL; u32 premap = 0, old_postmap, new_postmap, lane = 0, i; struct log_entry log; int sub; while (len) { u32 cur_len; |
d9b83c756 libnvdimm, btt: r... |
1296 |
int e_flag; |
5212e11fd nd_btt: atomic se... |
1297 |
|
d9b83c756 libnvdimm, btt: r... |
1298 |
retry: |
5212e11fd nd_btt: atomic se... |
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 |
lane = nd_region_acquire_lane(btt->nd_region); ret = lba_to_arena(btt, sector, &premap, &arena); if (ret) goto out_lane; cur_len = min(btt->sector_size, len); if ((arena->flags & IB_FLAG_ERROR_MASK) != 0) { ret = -EIO; goto out_lane; } |
d9b83c756 libnvdimm, btt: r... |
1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 |
if (btt_is_badblock(btt, arena, arena->freelist[lane].block)) arena->freelist[lane].has_err = 1; if (mutex_is_locked(&arena->err_lock) || arena->freelist[lane].has_err) { nd_region_release_lane(btt->nd_region, lane); ret = arena_clear_freelist_error(arena, lane); if (ret) return ret; /* OK to acquire a different lane/free block */ goto retry; } |
5212e11fd nd_btt: atomic se... |
1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 |
new_postmap = arena->freelist[lane].block; /* Wait if the new block is being read from */ for (i = 0; i < arena->nfree; i++) while (arena->rtt[i] == (RTT_VALID | new_postmap)) cpu_relax(); if (new_postmap >= arena->internal_nlba) { ret = -EIO; goto out_lane; |
41cd8b70c libnvdimm, btt: a... |
1335 1336 1337 |
} ret = btt_data_write(arena, new_postmap, page, off, cur_len); |
5212e11fd nd_btt: atomic se... |
1338 1339 |
if (ret) goto out_lane; |
41cd8b70c libnvdimm, btt: a... |
1340 1341 1342 1343 1344 1345 |
if (bip) { ret = btt_rw_integrity(btt, bip, arena, new_postmap, WRITE); if (ret) goto out_lane; } |
5212e11fd nd_btt: atomic se... |
1346 |
lock_map(arena, premap); |
d9b83c756 libnvdimm, btt: r... |
1347 |
ret = btt_map_read(arena, premap, &old_postmap, NULL, &e_flag, |
3ae3d67ba libnvdimm: add an... |
1348 |
NVDIMM_IO_ATOMIC); |
5212e11fd nd_btt: atomic se... |
1349 1350 1351 1352 1353 1354 |
if (ret) goto out_map; if (old_postmap >= arena->internal_nlba) { ret = -EIO; goto out_map; } |
d9b83c756 libnvdimm, btt: r... |
1355 1356 |
if (e_flag) set_e_flag(old_postmap); |
5212e11fd nd_btt: atomic se... |
1357 1358 1359 1360 1361 1362 1363 1364 1365 |
log.lba = cpu_to_le32(premap); log.old_map = cpu_to_le32(old_postmap); log.new_map = cpu_to_le32(new_postmap); log.seq = cpu_to_le32(arena->freelist[lane].seq); sub = arena->freelist[lane].sub; ret = btt_flog_write(arena, lane, sub, &log); if (ret) goto out_map; |
1db1f3cea libnvdimm, btt: f... |
1366 1367 |
ret = btt_map_write(arena, premap, new_postmap, 0, 0, NVDIMM_IO_ATOMIC); |
5212e11fd nd_btt: atomic se... |
1368 1369 1370 1371 1372 |
if (ret) goto out_map; unlock_map(arena, premap); nd_region_release_lane(btt->nd_region, lane); |
d9b83c756 libnvdimm, btt: r... |
1373 1374 1375 1376 1377 |
if (e_flag) { ret = arena_clear_freelist_error(arena, lane); if (ret) return ret; } |
5212e11fd nd_btt: atomic se... |
1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 |
len -= cur_len; off += cur_len; sector += btt->sector_size >> SECTOR_SHIFT; } return 0; out_map: unlock_map(arena, premap); out_lane: nd_region_release_lane(btt->nd_region, lane); return ret; } |
41cd8b70c libnvdimm, btt: a... |
1391 1392 |
static int btt_do_bvec(struct btt *btt, struct bio_integrity_payload *bip, struct page *page, unsigned int len, unsigned int off, |
3f289dcb4 block: make bdev_... |
1393 |
unsigned int op, sector_t sector) |
5212e11fd nd_btt: atomic se... |
1394 1395 |
{ int ret; |
3f289dcb4 block: make bdev_... |
1396 |
if (!op_is_write(op)) { |
41cd8b70c libnvdimm, btt: a... |
1397 |
ret = btt_read_pg(btt, bip, page, off, sector, len); |
5212e11fd nd_btt: atomic se... |
1398 1399 1400 |
flush_dcache_page(page); } else { flush_dcache_page(page); |
41cd8b70c libnvdimm, btt: a... |
1401 |
ret = btt_write_pg(btt, bip, sector, page, off, len); |
5212e11fd nd_btt: atomic se... |
1402 1403 1404 1405 |
} return ret; } |
c62b37d96 block: move ->mak... |
1406 |
static blk_qc_t btt_submit_bio(struct bio *bio) |
5212e11fd nd_btt: atomic se... |
1407 |
{ |
41cd8b70c libnvdimm, btt: a... |
1408 |
struct bio_integrity_payload *bip = bio_integrity(bio); |
5713bcc3f nvdimm/btt: stop ... |
1409 |
struct btt *btt = bio->bi_disk->private_data; |
5212e11fd nd_btt: atomic se... |
1410 |
struct bvec_iter iter; |
f0dc089ce libnvdimm: enable... |
1411 |
unsigned long start; |
5212e11fd nd_btt: atomic se... |
1412 |
struct bio_vec bvec; |
abf545484 mm/block: convert... |
1413 |
int err = 0; |
f0dc089ce libnvdimm: enable... |
1414 |
bool do_acct; |
5212e11fd nd_btt: atomic se... |
1415 |
|
e23947bd7 bio-integrity: fo... |
1416 1417 |
if (!bio_integrity_prep(bio)) return BLK_QC_T_NONE; |
41cd8b70c libnvdimm, btt: a... |
1418 |
|
0fd92f89a nvdimm: use bio_{... |
1419 1420 1421 |
do_acct = blk_queue_io_stat(bio->bi_disk->queue); if (do_acct) start = bio_start_io_acct(bio); |
5212e11fd nd_btt: atomic se... |
1422 1423 |
bio_for_each_segment(bvec, bio, iter) { unsigned int len = bvec.bv_len; |
86652d2eb libnvdimm, btt: c... |
1424 1425 1426 1427 1428 1429 1430 1431 |
if (len > PAGE_SIZE || len < btt->sector_size || len % btt->sector_size) { dev_err_ratelimited(&btt->nd_btt->dev, "unaligned bio segment (len: %d) ", len); bio->bi_status = BLK_STS_IOERR; break; } |
5212e11fd nd_btt: atomic se... |
1432 |
|
41cd8b70c libnvdimm, btt: a... |
1433 |
err = btt_do_bvec(btt, bip, bvec.bv_page, len, bvec.bv_offset, |
3f289dcb4 block: make bdev_... |
1434 |
bio_op(bio), iter.bi_sector); |
5212e11fd nd_btt: atomic se... |
1435 |
if (err) { |
e6be2dcbe libnvdimm, btt: c... |
1436 |
dev_err(&btt->nd_btt->dev, |
5212e11fd nd_btt: atomic se... |
1437 1438 |
"io error in %s sector %lld, len %d, ", |
abf545484 mm/block: convert... |
1439 1440 |
(op_is_write(bio_op(bio))) ? "WRITE" : "READ", |
5212e11fd nd_btt: atomic se... |
1441 |
(unsigned long long) iter.bi_sector, len); |
4e4cbee93 block: switch bio... |
1442 |
bio->bi_status = errno_to_blk_status(err); |
f0dc089ce libnvdimm: enable... |
1443 |
break; |
5212e11fd nd_btt: atomic se... |
1444 1445 |
} } |
f0dc089ce libnvdimm: enable... |
1446 |
if (do_acct) |
0fd92f89a nvdimm: use bio_{... |
1447 |
bio_end_io_acct(bio, start); |
5212e11fd nd_btt: atomic se... |
1448 |
|
4246a0b63 block: add a bi_e... |
1449 |
bio_endio(bio); |
dece16353 block: change ->m... |
1450 |
return BLK_QC_T_NONE; |
5212e11fd nd_btt: atomic se... |
1451 1452 1453 |
} static int btt_rw_page(struct block_device *bdev, sector_t sector, |
3f289dcb4 block: make bdev_... |
1454 |
struct page *page, unsigned int op) |
5212e11fd nd_btt: atomic se... |
1455 1456 |
{ struct btt *btt = bdev->bd_disk->private_data; |
c13c43d54 libnvdimm, btt: f... |
1457 |
int rc; |
5212e11fd nd_btt: atomic se... |
1458 |
|
af3bbc12d mm: add thp_size |
1459 |
rc = btt_do_bvec(btt, NULL, page, thp_size(page), 0, op, sector); |
c13c43d54 libnvdimm, btt: f... |
1460 |
if (rc == 0) |
3f289dcb4 block: make bdev_... |
1461 |
page_endio(page, op_is_write(op), 0); |
c13c43d54 libnvdimm, btt: f... |
1462 1463 |
return rc; |
5212e11fd nd_btt: atomic se... |
1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 |
} static int btt_getgeo(struct block_device *bd, struct hd_geometry *geo) { /* some standard values */ geo->heads = 1 << 6; geo->sectors = 1 << 5; geo->cylinders = get_capacity(bd->bd_disk) >> 11; return 0; } static const struct block_device_operations btt_fops = { .owner = THIS_MODULE, |
c62b37d96 block: move ->mak... |
1478 |
.submit_bio = btt_submit_bio, |
5212e11fd nd_btt: atomic se... |
1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 |
.rw_page = btt_rw_page, .getgeo = btt_getgeo, }; static int btt_blk_init(struct btt *btt) { struct nd_btt *nd_btt = btt->nd_btt; struct nd_namespace_common *ndns = nd_btt->ndns; /* create a new disk and request queue for btt */ |
c62b37d96 block: move ->mak... |
1489 |
btt->btt_queue = blk_alloc_queue(NUMA_NO_NODE); |
5212e11fd nd_btt: atomic se... |
1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 |
if (!btt->btt_queue) return -ENOMEM; btt->btt_disk = alloc_disk(0); if (!btt->btt_disk) { blk_cleanup_queue(btt->btt_queue); return -ENOMEM; } nvdimm_namespace_disk_name(ndns, btt->btt_disk->disk_name); |
5212e11fd nd_btt: atomic se... |
1500 1501 1502 1503 1504 |
btt->btt_disk->first_minor = 0; btt->btt_disk->fops = &btt_fops; btt->btt_disk->private_data = btt; btt->btt_disk->queue = btt->btt_queue; btt->btt_disk->flags = GENHD_FL_EXT_DEVT; |
5212e11fd nd_btt: atomic se... |
1505 1506 |
blk_queue_logical_block_size(btt->btt_queue, btt->sector_size); blk_queue_max_hw_sectors(btt->btt_queue, UINT_MAX); |
8b904b5b6 block: Use blk_qu... |
1507 |
blk_queue_flag_set(QUEUE_FLAG_NONROT, btt->btt_queue); |
5212e11fd nd_btt: atomic se... |
1508 |
|
41cd8b70c libnvdimm, btt: a... |
1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 |
if (btt_meta_size(btt)) { int rc = nd_integrity_init(btt->btt_disk, btt_meta_size(btt)); if (rc) { del_gendisk(btt->btt_disk); put_disk(btt->btt_disk); blk_cleanup_queue(btt->btt_queue); return rc; } } set_capacity(btt->btt_disk, btt->nlba * btt->sector_size >> 9); |
fef912bf8 block: genhd: add... |
1520 |
device_add_disk(&btt->nd_btt->dev, btt->btt_disk, NULL); |
abe8b4e3c nvdimm, btt: add ... |
1521 |
btt->nd_btt->size = btt->nlba * (u64)btt->sector_size; |
32f61d675 nvdimm: simplify ... |
1522 |
nvdimm_check_and_set_ro(btt->btt_disk); |
5212e11fd nd_btt: atomic se... |
1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 |
return 0; } static void btt_blk_cleanup(struct btt *btt) { del_gendisk(btt->btt_disk); put_disk(btt->btt_disk); blk_cleanup_queue(btt->btt_queue); } /** * btt_init - initialize a block translation table for the given device * @nd_btt: device with BTT geometry and backing device info * @rawsize: raw size in bytes of the backing device * @lbasize: lba size of the backing device * @uuid: A uuid for the backing device - this is stored on media * @maxlane: maximum number of parallel requests the device can handle * * Initialize a Block Translation Table on a backing device to provide * single sector power fail atomicity. * * Context: * Might sleep. * * Returns: * Pointer to a new struct btt on success, NULL on failure. */ static struct btt *btt_init(struct nd_btt *nd_btt, unsigned long long rawsize, u32 lbasize, u8 *uuid, struct nd_region *nd_region) { int ret; struct btt *btt; |
d9b83c756 libnvdimm, btt: r... |
1556 |
struct nd_namespace_io *nsio; |
5212e11fd nd_btt: atomic se... |
1557 |
struct device *dev = &nd_btt->dev; |
e32bc729a libnvdimm, btt, c... |
1558 |
btt = devm_kzalloc(dev, sizeof(struct btt), GFP_KERNEL); |
5212e11fd nd_btt: atomic se... |
1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 |
if (!btt) return NULL; btt->nd_btt = nd_btt; btt->rawsize = rawsize; btt->lbasize = lbasize; btt->sector_size = ((lbasize >= 4096) ? 4096 : 512); INIT_LIST_HEAD(&btt->arena_list); mutex_init(&btt->init_lock); btt->nd_region = nd_region; |
d9b83c756 libnvdimm, btt: r... |
1569 1570 |
nsio = to_nd_namespace_io(&nd_btt->ndns->dev); btt->phys_bb = &nsio->bb; |
5212e11fd nd_btt: atomic se... |
1571 1572 1573 1574 1575 |
ret = discover_arenas(btt); if (ret) { dev_err(dev, "init: error in arena_discover: %d ", ret); |
e32bc729a libnvdimm, btt, c... |
1576 |
return NULL; |
5212e11fd nd_btt: atomic se... |
1577 |
} |
581388209 libnvdimm, nfit: ... |
1578 |
if (btt->init_state != INIT_READY && nd_region->ro) { |
e6be2dcbe libnvdimm, btt: c... |
1579 1580 |
dev_warn(dev, "%s is read-only, unable to init btt metadata ", |
581388209 libnvdimm, nfit: ... |
1581 |
dev_name(&nd_region->dev)); |
e32bc729a libnvdimm, btt, c... |
1582 |
return NULL; |
581388209 libnvdimm, nfit: ... |
1583 |
} else if (btt->init_state != INIT_READY) { |
5212e11fd nd_btt: atomic se... |
1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 |
btt->num_arenas = (rawsize / ARENA_MAX_SIZE) + ((rawsize % ARENA_MAX_SIZE) ? 1 : 0); dev_dbg(dev, "init: %d arenas for %llu rawsize ", btt->num_arenas, rawsize); ret = create_arenas(btt); if (ret) { dev_info(dev, "init: create_arenas: %d ", ret); |
e32bc729a libnvdimm, btt, c... |
1594 |
return NULL; |
5212e11fd nd_btt: atomic se... |
1595 1596 1597 1598 1599 1600 |
} ret = btt_meta_init(btt); if (ret) { dev_err(dev, "init: error in meta_init: %d ", ret); |
e32bc729a libnvdimm, btt, c... |
1601 |
return NULL; |
5212e11fd nd_btt: atomic se... |
1602 1603 1604 1605 1606 1607 1608 |
} } ret = btt_blk_init(btt); if (ret) { dev_err(dev, "init: error in blk_init: %d ", ret); |
e32bc729a libnvdimm, btt, c... |
1609 |
return NULL; |
5212e11fd nd_btt: atomic se... |
1610 1611 1612 1613 1614 |
} btt_debugfs_init(btt); return btt; |
5212e11fd nd_btt: atomic se... |
1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 |
} /** * btt_fini - de-initialize a BTT * @btt: the BTT handle that was generated by btt_init * * De-initialize a Block Translation Table on device removal * * Context: * Might sleep. */ static void btt_fini(struct btt *btt) { if (btt) { btt_blk_cleanup(btt); free_arenas(btt); debugfs_remove_recursive(btt->debugfs_dir); |
5212e11fd nd_btt: atomic se... |
1632 1633 1634 1635 1636 1637 1638 |
} } int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns) { struct nd_btt *nd_btt = to_nd_btt(ndns->claim); struct nd_region *nd_region; |
14e494542 libnvdimm, btt: B... |
1639 |
struct btt_sb *btt_sb; |
5212e11fd nd_btt: atomic se... |
1640 |
struct btt *btt; |
8f4b01fcd libnvdimm/namespa... |
1641 1642 |
size_t size, rawsize; int rc; |
5212e11fd nd_btt: atomic se... |
1643 |
|
9dec4892c libnvdimm, btt: a... |
1644 1645 1646 |
if (!nd_btt->uuid || !nd_btt->ndns || !nd_btt->lbasize) { dev_dbg(&nd_btt->dev, "incomplete btt configuration "); |
5212e11fd nd_btt: atomic se... |
1647 |
return -ENODEV; |
9dec4892c libnvdimm, btt: a... |
1648 |
} |
5212e11fd nd_btt: atomic se... |
1649 |
|
14e494542 libnvdimm, btt: B... |
1650 |
btt_sb = devm_kzalloc(&nd_btt->dev, sizeof(*btt_sb), GFP_KERNEL); |
ed36b4dba libnvdimm, btt: c... |
1651 1652 |
if (!btt_sb) return -ENOMEM; |
14e494542 libnvdimm, btt: B... |
1653 |
|
8f4b01fcd libnvdimm/namespa... |
1654 1655 1656 1657 |
size = nvdimm_namespace_capacity(ndns); rc = devm_namespace_enable(&nd_btt->dev, ndns, size); if (rc) return rc; |
14e494542 libnvdimm, btt: B... |
1658 1659 1660 1661 1662 1663 1664 |
/* * If this returns < 0, that is ok as it just means there wasn't * an existing BTT, and we're creating a new one. We still need to * call this as we need the version dependent fields in nd_btt to be * set correctly based on the holder class */ nd_btt_version(nd_btt, ndns, btt_sb); |
8f4b01fcd libnvdimm/namespa... |
1665 |
rawsize = size - nd_btt->initial_offset; |
5212e11fd nd_btt: atomic se... |
1666 |
if (rawsize < ARENA_MIN_SIZE) { |
9dec4892c libnvdimm, btt: a... |
1667 1668 |
dev_dbg(&nd_btt->dev, "%s must be at least %ld bytes ", |
14e494542 libnvdimm, btt: B... |
1669 1670 |
dev_name(&ndns->dev), ARENA_MIN_SIZE + nd_btt->initial_offset); |
5212e11fd nd_btt: atomic se... |
1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 |
return -ENXIO; } nd_region = to_nd_region(nd_btt->dev.parent); btt = btt_init(nd_btt, rawsize, nd_btt->lbasize, nd_btt->uuid, nd_region); if (!btt) return -ENOMEM; nd_btt->btt = btt; return 0; } EXPORT_SYMBOL(nvdimm_namespace_attach_btt); |
298f2bc5d libnvdimm, pmem: ... |
1683 |
int nvdimm_namespace_detach_btt(struct nd_btt *nd_btt) |
5212e11fd nd_btt: atomic se... |
1684 |
{ |
5212e11fd nd_btt: atomic se... |
1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 |
struct btt *btt = nd_btt->btt; btt_fini(btt); nd_btt->btt = NULL; return 0; } EXPORT_SYMBOL(nvdimm_namespace_detach_btt); static int __init nd_btt_init(void) { |
ff8e92d5d nvdimm/btt: don't... |
1696 |
int rc = 0; |
5212e11fd nd_btt: atomic se... |
1697 1698 |
debugfs_root = debugfs_create_dir("btt", NULL); |
ff8e92d5d nvdimm/btt: don't... |
1699 |
if (IS_ERR_OR_NULL(debugfs_root)) |
5212e11fd nd_btt: atomic se... |
1700 |
rc = -ENXIO; |
5212e11fd nd_btt: atomic se... |
1701 1702 1703 1704 1705 1706 1707 |
return rc; } static void __exit nd_btt_exit(void) { debugfs_remove_recursive(debugfs_root); |
5212e11fd nd_btt: atomic se... |
1708 1709 1710 1711 1712 1713 1714 |
} MODULE_ALIAS_ND_DEVICE(ND_DEVICE_BTT); MODULE_AUTHOR("Vishal Verma <vishal.l.verma@linux.intel.com>"); MODULE_LICENSE("GPL v2"); module_init(nd_btt_init); module_exit(nd_btt_exit); |