541 lines
14 KiB
C
541 lines
14 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* NILFS disk address translation.
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*
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* Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
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*
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* Written by Koji Sato.
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*/
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#include <linux/types.h>
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#include <linux/buffer_head.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include "nilfs.h"
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#include "mdt.h"
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#include "alloc.h"
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#include "dat.h"
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#define NILFS_CNO_MIN ((__u64)1)
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#define NILFS_CNO_MAX (~(__u64)0)
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/**
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* struct nilfs_dat_info - on-memory private data of DAT file
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* @mi: on-memory private data of metadata file
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* @palloc_cache: persistent object allocator cache of DAT file
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* @shadow: shadow map of DAT file
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*/
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struct nilfs_dat_info {
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struct nilfs_mdt_info mi;
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struct nilfs_palloc_cache palloc_cache;
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struct nilfs_shadow_map shadow;
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};
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static inline struct nilfs_dat_info *NILFS_DAT_I(struct inode *dat)
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{
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return (struct nilfs_dat_info *)NILFS_MDT(dat);
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}
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static int nilfs_dat_prepare_entry(struct inode *dat,
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struct nilfs_palloc_req *req, int create)
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{
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int ret;
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ret = nilfs_palloc_get_entry_block(dat, req->pr_entry_nr,
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create, &req->pr_entry_bh);
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if (unlikely(ret == -ENOENT)) {
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nilfs_err(dat->i_sb,
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"DAT doesn't have a block to manage vblocknr = %llu",
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(unsigned long long)req->pr_entry_nr);
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/*
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* Return internal code -EINVAL to notify bmap layer of
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* metadata corruption.
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*/
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ret = -EINVAL;
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}
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return ret;
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}
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static void nilfs_dat_commit_entry(struct inode *dat,
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struct nilfs_palloc_req *req)
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{
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mark_buffer_dirty(req->pr_entry_bh);
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nilfs_mdt_mark_dirty(dat);
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brelse(req->pr_entry_bh);
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}
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static void nilfs_dat_abort_entry(struct inode *dat,
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struct nilfs_palloc_req *req)
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{
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brelse(req->pr_entry_bh);
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}
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int nilfs_dat_prepare_alloc(struct inode *dat, struct nilfs_palloc_req *req)
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{
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int ret;
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ret = nilfs_palloc_prepare_alloc_entry(dat, req);
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if (ret < 0)
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return ret;
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ret = nilfs_dat_prepare_entry(dat, req, 1);
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if (ret < 0)
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nilfs_palloc_abort_alloc_entry(dat, req);
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return ret;
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}
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void nilfs_dat_commit_alloc(struct inode *dat, struct nilfs_palloc_req *req)
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{
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struct nilfs_dat_entry *entry;
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void *kaddr;
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kaddr = kmap_atomic(req->pr_entry_bh->b_page);
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entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr,
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req->pr_entry_bh, kaddr);
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entry->de_start = cpu_to_le64(NILFS_CNO_MIN);
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entry->de_end = cpu_to_le64(NILFS_CNO_MAX);
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entry->de_blocknr = cpu_to_le64(0);
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kunmap_atomic(kaddr);
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nilfs_palloc_commit_alloc_entry(dat, req);
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nilfs_dat_commit_entry(dat, req);
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}
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void nilfs_dat_abort_alloc(struct inode *dat, struct nilfs_palloc_req *req)
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{
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nilfs_dat_abort_entry(dat, req);
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nilfs_palloc_abort_alloc_entry(dat, req);
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}
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static void nilfs_dat_commit_free(struct inode *dat,
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struct nilfs_palloc_req *req)
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{
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struct nilfs_dat_entry *entry;
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void *kaddr;
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kaddr = kmap_atomic(req->pr_entry_bh->b_page);
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entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr,
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req->pr_entry_bh, kaddr);
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entry->de_start = cpu_to_le64(NILFS_CNO_MIN);
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entry->de_end = cpu_to_le64(NILFS_CNO_MIN);
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entry->de_blocknr = cpu_to_le64(0);
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kunmap_atomic(kaddr);
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nilfs_dat_commit_entry(dat, req);
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if (unlikely(req->pr_desc_bh == NULL || req->pr_bitmap_bh == NULL)) {
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nilfs_error(dat->i_sb,
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"state inconsistency probably due to duplicate use of vblocknr = %llu",
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(unsigned long long)req->pr_entry_nr);
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return;
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}
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nilfs_palloc_commit_free_entry(dat, req);
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}
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int nilfs_dat_prepare_start(struct inode *dat, struct nilfs_palloc_req *req)
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{
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return nilfs_dat_prepare_entry(dat, req, 0);
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}
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void nilfs_dat_commit_start(struct inode *dat, struct nilfs_palloc_req *req,
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sector_t blocknr)
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{
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struct nilfs_dat_entry *entry;
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void *kaddr;
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kaddr = kmap_atomic(req->pr_entry_bh->b_page);
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entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr,
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req->pr_entry_bh, kaddr);
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entry->de_start = cpu_to_le64(nilfs_mdt_cno(dat));
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entry->de_blocknr = cpu_to_le64(blocknr);
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kunmap_atomic(kaddr);
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nilfs_dat_commit_entry(dat, req);
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}
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int nilfs_dat_prepare_end(struct inode *dat, struct nilfs_palloc_req *req)
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{
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struct nilfs_dat_entry *entry;
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__u64 start;
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sector_t blocknr;
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void *kaddr;
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int ret;
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ret = nilfs_dat_prepare_entry(dat, req, 0);
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if (ret < 0)
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return ret;
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kaddr = kmap_atomic(req->pr_entry_bh->b_page);
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entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr,
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req->pr_entry_bh, kaddr);
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start = le64_to_cpu(entry->de_start);
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blocknr = le64_to_cpu(entry->de_blocknr);
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kunmap_atomic(kaddr);
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if (blocknr == 0) {
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ret = nilfs_palloc_prepare_free_entry(dat, req);
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if (ret < 0) {
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nilfs_dat_abort_entry(dat, req);
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return ret;
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}
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}
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if (unlikely(start > nilfs_mdt_cno(dat))) {
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nilfs_err(dat->i_sb,
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"vblocknr = %llu has abnormal lifetime: start cno (= %llu) > current cno (= %llu)",
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(unsigned long long)req->pr_entry_nr,
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(unsigned long long)start,
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(unsigned long long)nilfs_mdt_cno(dat));
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nilfs_dat_abort_entry(dat, req);
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return -EINVAL;
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}
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return 0;
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}
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void nilfs_dat_commit_end(struct inode *dat, struct nilfs_palloc_req *req,
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int dead)
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{
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struct nilfs_dat_entry *entry;
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__u64 start, end;
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sector_t blocknr;
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void *kaddr;
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kaddr = kmap_atomic(req->pr_entry_bh->b_page);
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entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr,
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req->pr_entry_bh, kaddr);
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end = start = le64_to_cpu(entry->de_start);
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if (!dead) {
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end = nilfs_mdt_cno(dat);
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WARN_ON(start > end);
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}
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entry->de_end = cpu_to_le64(end);
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blocknr = le64_to_cpu(entry->de_blocknr);
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kunmap_atomic(kaddr);
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if (blocknr == 0)
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nilfs_dat_commit_free(dat, req);
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else
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nilfs_dat_commit_entry(dat, req);
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}
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void nilfs_dat_abort_end(struct inode *dat, struct nilfs_palloc_req *req)
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{
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struct nilfs_dat_entry *entry;
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__u64 start;
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sector_t blocknr;
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void *kaddr;
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kaddr = kmap_atomic(req->pr_entry_bh->b_page);
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entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr,
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req->pr_entry_bh, kaddr);
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start = le64_to_cpu(entry->de_start);
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blocknr = le64_to_cpu(entry->de_blocknr);
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kunmap_atomic(kaddr);
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if (start == nilfs_mdt_cno(dat) && blocknr == 0)
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nilfs_palloc_abort_free_entry(dat, req);
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nilfs_dat_abort_entry(dat, req);
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}
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int nilfs_dat_prepare_update(struct inode *dat,
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struct nilfs_palloc_req *oldreq,
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struct nilfs_palloc_req *newreq)
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{
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int ret;
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ret = nilfs_dat_prepare_end(dat, oldreq);
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if (!ret) {
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ret = nilfs_dat_prepare_alloc(dat, newreq);
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if (ret < 0)
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nilfs_dat_abort_end(dat, oldreq);
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}
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return ret;
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}
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void nilfs_dat_commit_update(struct inode *dat,
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struct nilfs_palloc_req *oldreq,
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struct nilfs_palloc_req *newreq, int dead)
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{
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nilfs_dat_commit_end(dat, oldreq, dead);
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nilfs_dat_commit_alloc(dat, newreq);
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}
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void nilfs_dat_abort_update(struct inode *dat,
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struct nilfs_palloc_req *oldreq,
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struct nilfs_palloc_req *newreq)
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{
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nilfs_dat_abort_end(dat, oldreq);
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nilfs_dat_abort_alloc(dat, newreq);
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}
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/**
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* nilfs_dat_mark_dirty -
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* @dat: DAT file inode
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* @vblocknr: virtual block number
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*
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* Description:
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*
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* Return Value: On success, 0 is returned. On error, one of the following
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* negative error codes is returned.
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*
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* %-EIO - I/O error.
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*
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* %-ENOMEM - Insufficient amount of memory available.
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*/
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int nilfs_dat_mark_dirty(struct inode *dat, __u64 vblocknr)
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{
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struct nilfs_palloc_req req;
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int ret;
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req.pr_entry_nr = vblocknr;
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ret = nilfs_dat_prepare_entry(dat, &req, 0);
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if (ret == 0)
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nilfs_dat_commit_entry(dat, &req);
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return ret;
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}
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/**
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* nilfs_dat_freev - free virtual block numbers
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* @dat: DAT file inode
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* @vblocknrs: array of virtual block numbers
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* @nitems: number of virtual block numbers
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*
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* Description: nilfs_dat_freev() frees the virtual block numbers specified by
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* @vblocknrs and @nitems.
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*
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* Return Value: On success, 0 is returned. On error, one of the following
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* negative error codes is returned.
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*
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* %-EIO - I/O error.
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*
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* %-ENOMEM - Insufficient amount of memory available.
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*
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* %-ENOENT - The virtual block number have not been allocated.
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*/
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int nilfs_dat_freev(struct inode *dat, __u64 *vblocknrs, size_t nitems)
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{
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return nilfs_palloc_freev(dat, vblocknrs, nitems);
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}
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/**
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* nilfs_dat_move - change a block number
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* @dat: DAT file inode
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* @vblocknr: virtual block number
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* @blocknr: block number
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*
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* Description: nilfs_dat_move() changes the block number associated with
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* @vblocknr to @blocknr.
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*
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* Return Value: On success, 0 is returned. On error, one of the following
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* negative error codes is returned.
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*
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* %-EIO - I/O error.
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*
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* %-ENOMEM - Insufficient amount of memory available.
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*/
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int nilfs_dat_move(struct inode *dat, __u64 vblocknr, sector_t blocknr)
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{
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struct buffer_head *entry_bh;
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struct nilfs_dat_entry *entry;
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void *kaddr;
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int ret;
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ret = nilfs_palloc_get_entry_block(dat, vblocknr, 0, &entry_bh);
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if (ret < 0)
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return ret;
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|
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|
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/*
|
||
|
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* The given disk block number (blocknr) is not yet written to
|
||
|
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* the device at this point.
|
||
|
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*
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||
|
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* To prevent nilfs_dat_translate() from returning the
|
||
|
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* uncommitted block number, this makes a copy of the entry
|
||
|
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* buffer and redirects nilfs_dat_translate() to the copy.
|
||
|
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*/
|
||
|
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if (!buffer_nilfs_redirected(entry_bh)) {
|
||
|
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ret = nilfs_mdt_freeze_buffer(dat, entry_bh);
|
||
|
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if (ret) {
|
||
|
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brelse(entry_bh);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
}
|
||
|
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|
||
|
|
kaddr = kmap_atomic(entry_bh->b_page);
|
||
|
|
entry = nilfs_palloc_block_get_entry(dat, vblocknr, entry_bh, kaddr);
|
||
|
|
if (unlikely(entry->de_blocknr == cpu_to_le64(0))) {
|
||
|
|
nilfs_crit(dat->i_sb,
|
||
|
|
"%s: invalid vblocknr = %llu, [%llu, %llu)",
|
||
|
|
__func__, (unsigned long long)vblocknr,
|
||
|
|
(unsigned long long)le64_to_cpu(entry->de_start),
|
||
|
|
(unsigned long long)le64_to_cpu(entry->de_end));
|
||
|
|
kunmap_atomic(kaddr);
|
||
|
|
brelse(entry_bh);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
WARN_ON(blocknr == 0);
|
||
|
|
entry->de_blocknr = cpu_to_le64(blocknr);
|
||
|
|
kunmap_atomic(kaddr);
|
||
|
|
|
||
|
|
mark_buffer_dirty(entry_bh);
|
||
|
|
nilfs_mdt_mark_dirty(dat);
|
||
|
|
|
||
|
|
brelse(entry_bh);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* nilfs_dat_translate - translate a virtual block number to a block number
|
||
|
|
* @dat: DAT file inode
|
||
|
|
* @vblocknr: virtual block number
|
||
|
|
* @blocknrp: pointer to a block number
|
||
|
|
*
|
||
|
|
* Description: nilfs_dat_translate() maps the virtual block number @vblocknr
|
||
|
|
* to the corresponding block number.
|
||
|
|
*
|
||
|
|
* Return Value: On success, 0 is returned and the block number associated
|
||
|
|
* with @vblocknr is stored in the place pointed by @blocknrp. On error, one
|
||
|
|
* of the following negative error codes is returned.
|
||
|
|
*
|
||
|
|
* %-EIO - I/O error.
|
||
|
|
*
|
||
|
|
* %-ENOMEM - Insufficient amount of memory available.
|
||
|
|
*
|
||
|
|
* %-ENOENT - A block number associated with @vblocknr does not exist.
|
||
|
|
*/
|
||
|
|
int nilfs_dat_translate(struct inode *dat, __u64 vblocknr, sector_t *blocknrp)
|
||
|
|
{
|
||
|
|
struct buffer_head *entry_bh, *bh;
|
||
|
|
struct nilfs_dat_entry *entry;
|
||
|
|
sector_t blocknr;
|
||
|
|
void *kaddr;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = nilfs_palloc_get_entry_block(dat, vblocknr, 0, &entry_bh);
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
if (!nilfs_doing_gc() && buffer_nilfs_redirected(entry_bh)) {
|
||
|
|
bh = nilfs_mdt_get_frozen_buffer(dat, entry_bh);
|
||
|
|
if (bh) {
|
||
|
|
WARN_ON(!buffer_uptodate(bh));
|
||
|
|
brelse(entry_bh);
|
||
|
|
entry_bh = bh;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
kaddr = kmap_atomic(entry_bh->b_page);
|
||
|
|
entry = nilfs_palloc_block_get_entry(dat, vblocknr, entry_bh, kaddr);
|
||
|
|
blocknr = le64_to_cpu(entry->de_blocknr);
|
||
|
|
if (blocknr == 0) {
|
||
|
|
ret = -ENOENT;
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
*blocknrp = blocknr;
|
||
|
|
|
||
|
|
out:
|
||
|
|
kunmap_atomic(kaddr);
|
||
|
|
brelse(entry_bh);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
ssize_t nilfs_dat_get_vinfo(struct inode *dat, void *buf, unsigned int visz,
|
||
|
|
size_t nvi)
|
||
|
|
{
|
||
|
|
struct buffer_head *entry_bh;
|
||
|
|
struct nilfs_dat_entry *entry;
|
||
|
|
struct nilfs_vinfo *vinfo = buf;
|
||
|
|
__u64 first, last;
|
||
|
|
void *kaddr;
|
||
|
|
unsigned long entries_per_block = NILFS_MDT(dat)->mi_entries_per_block;
|
||
|
|
int i, j, n, ret;
|
||
|
|
|
||
|
|
for (i = 0; i < nvi; i += n) {
|
||
|
|
ret = nilfs_palloc_get_entry_block(dat, vinfo->vi_vblocknr,
|
||
|
|
0, &entry_bh);
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
kaddr = kmap_atomic(entry_bh->b_page);
|
||
|
|
/* last virtual block number in this block */
|
||
|
|
first = vinfo->vi_vblocknr;
|
||
|
|
do_div(first, entries_per_block);
|
||
|
|
first *= entries_per_block;
|
||
|
|
last = first + entries_per_block - 1;
|
||
|
|
for (j = i, n = 0;
|
||
|
|
j < nvi && vinfo->vi_vblocknr >= first &&
|
||
|
|
vinfo->vi_vblocknr <= last;
|
||
|
|
j++, n++, vinfo = (void *)vinfo + visz) {
|
||
|
|
entry = nilfs_palloc_block_get_entry(
|
||
|
|
dat, vinfo->vi_vblocknr, entry_bh, kaddr);
|
||
|
|
vinfo->vi_start = le64_to_cpu(entry->de_start);
|
||
|
|
vinfo->vi_end = le64_to_cpu(entry->de_end);
|
||
|
|
vinfo->vi_blocknr = le64_to_cpu(entry->de_blocknr);
|
||
|
|
}
|
||
|
|
kunmap_atomic(kaddr);
|
||
|
|
brelse(entry_bh);
|
||
|
|
}
|
||
|
|
|
||
|
|
return nvi;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* nilfs_dat_read - read or get dat inode
|
||
|
|
* @sb: super block instance
|
||
|
|
* @entry_size: size of a dat entry
|
||
|
|
* @raw_inode: on-disk dat inode
|
||
|
|
* @inodep: buffer to store the inode
|
||
|
|
*/
|
||
|
|
int nilfs_dat_read(struct super_block *sb, size_t entry_size,
|
||
|
|
struct nilfs_inode *raw_inode, struct inode **inodep)
|
||
|
|
{
|
||
|
|
static struct lock_class_key dat_lock_key;
|
||
|
|
struct inode *dat;
|
||
|
|
struct nilfs_dat_info *di;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
if (entry_size > sb->s_blocksize) {
|
||
|
|
nilfs_err(sb, "too large DAT entry size: %zu bytes",
|
||
|
|
entry_size);
|
||
|
|
return -EINVAL;
|
||
|
|
} else if (entry_size < NILFS_MIN_DAT_ENTRY_SIZE) {
|
||
|
|
nilfs_err(sb, "too small DAT entry size: %zu bytes",
|
||
|
|
entry_size);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
dat = nilfs_iget_locked(sb, NULL, NILFS_DAT_INO);
|
||
|
|
if (unlikely(!dat))
|
||
|
|
return -ENOMEM;
|
||
|
|
if (!(dat->i_state & I_NEW))
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
err = nilfs_mdt_init(dat, NILFS_MDT_GFP, sizeof(*di));
|
||
|
|
if (err)
|
||
|
|
goto failed;
|
||
|
|
|
||
|
|
err = nilfs_palloc_init_blockgroup(dat, entry_size);
|
||
|
|
if (err)
|
||
|
|
goto failed;
|
||
|
|
|
||
|
|
di = NILFS_DAT_I(dat);
|
||
|
|
lockdep_set_class(&di->mi.mi_sem, &dat_lock_key);
|
||
|
|
nilfs_palloc_setup_cache(dat, &di->palloc_cache);
|
||
|
|
err = nilfs_mdt_setup_shadow_map(dat, &di->shadow);
|
||
|
|
if (err)
|
||
|
|
goto failed;
|
||
|
|
|
||
|
|
err = nilfs_read_inode_common(dat, raw_inode);
|
||
|
|
if (err)
|
||
|
|
goto failed;
|
||
|
|
|
||
|
|
unlock_new_inode(dat);
|
||
|
|
out:
|
||
|
|
*inodep = dat;
|
||
|
|
return 0;
|
||
|
|
failed:
|
||
|
|
iget_failed(dat);
|
||
|
|
return err;
|
||
|
|
}
|