428 lines
11 KiB
C
428 lines
11 KiB
C
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/*
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* dat.c - 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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Written by Koji Sato <koji@osrg.net>.
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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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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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return nilfs_palloc_get_entry_block(dat, req->pr_entry_nr,
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create, &req->pr_entry_bh);
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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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nilfs_mdt_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, KM_USER0);
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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, KM_USER0);
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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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void nilfs_dat_commit_free(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, KM_USER0);
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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, KM_USER0);
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nilfs_dat_commit_entry(dat, req);
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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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int ret;
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ret = nilfs_dat_prepare_entry(dat, req, 0);
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WARN_ON(ret == -ENOENT);
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return ret;
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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, KM_USER0);
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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, KM_USER0);
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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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WARN_ON(ret == -ENOENT);
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return ret;
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}
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kaddr = kmap_atomic(req->pr_entry_bh->b_page, KM_USER0);
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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, KM_USER0);
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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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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, KM_USER0);
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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, KM_USER0);
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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, KM_USER0);
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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, KM_USER0);
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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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* nagative 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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kaddr = kmap_atomic(entry_bh->b_page, KM_USER0);
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entry = nilfs_palloc_block_get_entry(dat, vblocknr, entry_bh, kaddr);
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if (unlikely(entry->de_blocknr == cpu_to_le64(0))) {
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printk(KERN_CRIT "%s: vbn = %llu, [%llu, %llu)\n", __func__,
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(unsigned long long)vblocknr,
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(unsigned long long)le64_to_cpu(entry->de_start),
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(unsigned long long)le64_to_cpu(entry->de_end));
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kunmap_atomic(kaddr, KM_USER0);
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brelse(entry_bh);
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return -EINVAL;
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}
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WARN_ON(blocknr == 0);
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entry->de_blocknr = cpu_to_le64(blocknr);
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kunmap_atomic(kaddr, KM_USER0);
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nilfs_mdt_mark_buffer_dirty(entry_bh);
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nilfs_mdt_mark_dirty(dat);
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brelse(entry_bh);
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return 0;
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}
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/**
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* nilfs_dat_translate - translate a virtual block number to a block number
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* @dat: DAT file inode
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* @vblocknr: virtual block number
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* @blocknrp: pointer to a block number
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*
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* Description: nilfs_dat_translate() maps the virtual block number @vblocknr
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* to the corresponding block number.
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*
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* Return Value: On success, 0 is returned and the block number associated
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* with @vblocknr is stored in the place pointed by @blocknrp. On error, one
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* of the following 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 - 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;
|
||
|
|
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;
|
||
|
|
|
||
|
|
kaddr = kmap_atomic(entry_bh->b_page, KM_USER0);
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
if (blocknrp != NULL)
|
||
|
|
*blocknrp = blocknr;
|
||
|
|
|
||
|
|
out:
|
||
|
|
kunmap_atomic(kaddr, KM_USER0);
|
||
|
|
brelse(entry_bh);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
ssize_t nilfs_dat_get_vinfo(struct inode *dat, void *buf, unsigned 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, KM_USER0);
|
||
|
|
/* 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, KM_USER0);
|
||
|
|
brelse(entry_bh);
|
||
|
|
}
|
||
|
|
|
||
|
|
return nvi;
|
||
|
|
}
|