568 lines
14 KiB
C
568 lines
14 KiB
C
/*
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* bmap.c - NILFS block mapping.
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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/fs.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 "bmap.h"
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#include "btree.h"
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#include "direct.h"
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#include "btnode.h"
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#include "mdt.h"
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#include "dat.h"
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#include "alloc.h"
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struct inode *nilfs_bmap_get_dat(const struct nilfs_bmap *bmap)
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{
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struct the_nilfs *nilfs = bmap->b_inode->i_sb->s_fs_info;
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return nilfs->ns_dat;
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}
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static int nilfs_bmap_convert_error(struct nilfs_bmap *bmap,
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const char *fname, int err)
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{
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struct inode *inode = bmap->b_inode;
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if (err == -EINVAL) {
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nilfs_error(inode->i_sb, fname,
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"broken bmap (inode number=%lu)\n", inode->i_ino);
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err = -EIO;
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}
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return err;
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}
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/**
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* nilfs_bmap_lookup_at_level - find a data block or node block
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* @bmap: bmap
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* @key: key
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* @level: level
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* @ptrp: place to store the value associated to @key
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*
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* Description: nilfs_bmap_lookup_at_level() finds a record whose key
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* matches @key in the block at @level of the bmap.
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*
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* Return Value: On success, 0 is returned and the record associated with @key
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* is stored in the place pointed by @ptrp. 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 - A record associated with @key does not exist.
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*/
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int nilfs_bmap_lookup_at_level(struct nilfs_bmap *bmap, __u64 key, int level,
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__u64 *ptrp)
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{
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sector_t blocknr;
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int ret;
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down_read(&bmap->b_sem);
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ret = bmap->b_ops->bop_lookup(bmap, key, level, ptrp);
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if (ret < 0) {
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ret = nilfs_bmap_convert_error(bmap, __func__, ret);
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goto out;
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}
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if (NILFS_BMAP_USE_VBN(bmap)) {
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ret = nilfs_dat_translate(nilfs_bmap_get_dat(bmap), *ptrp,
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&blocknr);
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if (!ret)
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*ptrp = blocknr;
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}
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out:
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up_read(&bmap->b_sem);
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return ret;
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}
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int nilfs_bmap_lookup_contig(struct nilfs_bmap *bmap, __u64 key, __u64 *ptrp,
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unsigned maxblocks)
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{
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int ret;
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down_read(&bmap->b_sem);
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ret = bmap->b_ops->bop_lookup_contig(bmap, key, ptrp, maxblocks);
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up_read(&bmap->b_sem);
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return nilfs_bmap_convert_error(bmap, __func__, ret);
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}
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static int nilfs_bmap_do_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr)
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{
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__u64 keys[NILFS_BMAP_SMALL_HIGH + 1];
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__u64 ptrs[NILFS_BMAP_SMALL_HIGH + 1];
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int ret, n;
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if (bmap->b_ops->bop_check_insert != NULL) {
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ret = bmap->b_ops->bop_check_insert(bmap, key);
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if (ret > 0) {
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n = bmap->b_ops->bop_gather_data(
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bmap, keys, ptrs, NILFS_BMAP_SMALL_HIGH + 1);
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if (n < 0)
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return n;
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ret = nilfs_btree_convert_and_insert(
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bmap, key, ptr, keys, ptrs, n);
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if (ret == 0)
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bmap->b_u.u_flags |= NILFS_BMAP_LARGE;
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return ret;
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} else if (ret < 0)
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return ret;
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}
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return bmap->b_ops->bop_insert(bmap, key, ptr);
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}
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/**
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* nilfs_bmap_insert - insert a new key-record pair into a bmap
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* @bmap: bmap
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* @key: key
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* @rec: record
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*
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* Description: nilfs_bmap_insert() inserts the new key-record pair specified
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* by @key and @rec into @bmap.
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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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* %-EEXIST - A record associated with @key already exist.
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*/
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int nilfs_bmap_insert(struct nilfs_bmap *bmap,
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unsigned long key,
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unsigned long rec)
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{
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int ret;
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down_write(&bmap->b_sem);
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ret = nilfs_bmap_do_insert(bmap, key, rec);
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up_write(&bmap->b_sem);
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return nilfs_bmap_convert_error(bmap, __func__, ret);
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}
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static int nilfs_bmap_do_delete(struct nilfs_bmap *bmap, __u64 key)
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{
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__u64 keys[NILFS_BMAP_LARGE_LOW + 1];
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__u64 ptrs[NILFS_BMAP_LARGE_LOW + 1];
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int ret, n;
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if (bmap->b_ops->bop_check_delete != NULL) {
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ret = bmap->b_ops->bop_check_delete(bmap, key);
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if (ret > 0) {
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n = bmap->b_ops->bop_gather_data(
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bmap, keys, ptrs, NILFS_BMAP_LARGE_LOW + 1);
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if (n < 0)
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return n;
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ret = nilfs_direct_delete_and_convert(
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bmap, key, keys, ptrs, n);
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if (ret == 0)
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bmap->b_u.u_flags &= ~NILFS_BMAP_LARGE;
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return ret;
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} else if (ret < 0)
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return ret;
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}
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return bmap->b_ops->bop_delete(bmap, key);
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}
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int nilfs_bmap_last_key(struct nilfs_bmap *bmap, unsigned long *key)
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{
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__u64 lastkey;
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int ret;
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down_read(&bmap->b_sem);
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ret = bmap->b_ops->bop_last_key(bmap, &lastkey);
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up_read(&bmap->b_sem);
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if (ret < 0)
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ret = nilfs_bmap_convert_error(bmap, __func__, ret);
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else
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*key = lastkey;
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return ret;
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}
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/**
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* nilfs_bmap_delete - delete a key-record pair from a bmap
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* @bmap: bmap
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* @key: key
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*
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* Description: nilfs_bmap_delete() deletes the key-record pair specified by
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* @key from @bmap.
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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 - A record associated with @key does not exist.
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*/
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int nilfs_bmap_delete(struct nilfs_bmap *bmap, unsigned long key)
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{
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int ret;
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down_write(&bmap->b_sem);
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ret = nilfs_bmap_do_delete(bmap, key);
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up_write(&bmap->b_sem);
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return nilfs_bmap_convert_error(bmap, __func__, ret);
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}
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static int nilfs_bmap_do_truncate(struct nilfs_bmap *bmap, unsigned long key)
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{
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__u64 lastkey;
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int ret;
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ret = bmap->b_ops->bop_last_key(bmap, &lastkey);
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if (ret < 0) {
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if (ret == -ENOENT)
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ret = 0;
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return ret;
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}
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while (key <= lastkey) {
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ret = nilfs_bmap_do_delete(bmap, lastkey);
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if (ret < 0)
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return ret;
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ret = bmap->b_ops->bop_last_key(bmap, &lastkey);
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if (ret < 0) {
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if (ret == -ENOENT)
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ret = 0;
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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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/**
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* nilfs_bmap_truncate - truncate a bmap to a specified key
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* @bmap: bmap
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* @key: key
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*
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* Description: nilfs_bmap_truncate() removes key-record pairs whose keys are
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* greater than or equal to @key from @bmap.
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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_bmap_truncate(struct nilfs_bmap *bmap, unsigned long key)
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{
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int ret;
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down_write(&bmap->b_sem);
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ret = nilfs_bmap_do_truncate(bmap, key);
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up_write(&bmap->b_sem);
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return nilfs_bmap_convert_error(bmap, __func__, ret);
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}
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/**
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* nilfs_bmap_clear - free resources a bmap holds
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* @bmap: bmap
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*
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* Description: nilfs_bmap_clear() frees resources associated with @bmap.
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*/
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void nilfs_bmap_clear(struct nilfs_bmap *bmap)
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{
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down_write(&bmap->b_sem);
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if (bmap->b_ops->bop_clear != NULL)
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bmap->b_ops->bop_clear(bmap);
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up_write(&bmap->b_sem);
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}
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/**
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* nilfs_bmap_propagate - propagate dirty state
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* @bmap: bmap
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* @bh: buffer head
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*
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* Description: nilfs_bmap_propagate() marks the buffers that directly or
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* indirectly refer to the block specified by @bh dirty.
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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_bmap_propagate(struct nilfs_bmap *bmap, struct buffer_head *bh)
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{
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int ret;
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down_write(&bmap->b_sem);
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ret = bmap->b_ops->bop_propagate(bmap, bh);
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up_write(&bmap->b_sem);
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return nilfs_bmap_convert_error(bmap, __func__, ret);
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}
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/**
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* nilfs_bmap_lookup_dirty_buffers -
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* @bmap: bmap
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* @listp: pointer to buffer head list
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*/
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void nilfs_bmap_lookup_dirty_buffers(struct nilfs_bmap *bmap,
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struct list_head *listp)
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{
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if (bmap->b_ops->bop_lookup_dirty_buffers != NULL)
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bmap->b_ops->bop_lookup_dirty_buffers(bmap, listp);
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}
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/**
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* nilfs_bmap_assign - assign a new block number to a block
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* @bmap: bmap
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* @bhp: pointer to buffer head
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* @blocknr: block number
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* @binfo: block information
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*
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* Description: nilfs_bmap_assign() assigns the block number @blocknr to the
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* buffer specified by @bh.
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*
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* Return Value: On success, 0 is returned and the buffer head of a newly
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* create buffer and the block information associated with the buffer are
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* stored in the place pointed by @bh and @binfo, respectively. 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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int nilfs_bmap_assign(struct nilfs_bmap *bmap,
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struct buffer_head **bh,
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unsigned long blocknr,
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union nilfs_binfo *binfo)
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{
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int ret;
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down_write(&bmap->b_sem);
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ret = bmap->b_ops->bop_assign(bmap, bh, blocknr, binfo);
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up_write(&bmap->b_sem);
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return nilfs_bmap_convert_error(bmap, __func__, ret);
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}
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/**
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* nilfs_bmap_mark - mark block dirty
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* @bmap: bmap
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* @key: key
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* @level: level
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*
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* Description: nilfs_bmap_mark() marks the block specified by @key and @level
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* as dirty.
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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_bmap_mark(struct nilfs_bmap *bmap, __u64 key, int level)
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{
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int ret;
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if (bmap->b_ops->bop_mark == NULL)
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return 0;
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down_write(&bmap->b_sem);
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ret = bmap->b_ops->bop_mark(bmap, key, level);
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up_write(&bmap->b_sem);
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return nilfs_bmap_convert_error(bmap, __func__, ret);
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}
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/**
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* nilfs_bmap_test_and_clear_dirty - test and clear a bmap dirty state
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* @bmap: bmap
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*
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* Description: nilfs_test_and_clear() is the atomic operation to test and
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* clear the dirty state of @bmap.
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*
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* Return Value: 1 is returned if @bmap is dirty, or 0 if clear.
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*/
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int nilfs_bmap_test_and_clear_dirty(struct nilfs_bmap *bmap)
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{
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int ret;
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down_write(&bmap->b_sem);
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ret = nilfs_bmap_dirty(bmap);
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nilfs_bmap_clear_dirty(bmap);
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up_write(&bmap->b_sem);
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return ret;
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}
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/*
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* Internal use only
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*/
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__u64 nilfs_bmap_data_get_key(const struct nilfs_bmap *bmap,
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const struct buffer_head *bh)
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{
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struct buffer_head *pbh;
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__u64 key;
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key = page_index(bh->b_page) << (PAGE_CACHE_SHIFT -
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bmap->b_inode->i_blkbits);
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for (pbh = page_buffers(bh->b_page); pbh != bh; pbh = pbh->b_this_page)
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key++;
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return key;
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}
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__u64 nilfs_bmap_find_target_seq(const struct nilfs_bmap *bmap, __u64 key)
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{
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__s64 diff;
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diff = key - bmap->b_last_allocated_key;
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if ((nilfs_bmap_keydiff_abs(diff) < NILFS_INODE_BMAP_SIZE) &&
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(bmap->b_last_allocated_ptr != NILFS_BMAP_INVALID_PTR) &&
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(bmap->b_last_allocated_ptr + diff > 0))
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return bmap->b_last_allocated_ptr + diff;
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else
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return NILFS_BMAP_INVALID_PTR;
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}
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#define NILFS_BMAP_GROUP_DIV 8
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__u64 nilfs_bmap_find_target_in_group(const struct nilfs_bmap *bmap)
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{
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struct inode *dat = nilfs_bmap_get_dat(bmap);
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unsigned long entries_per_group = nilfs_palloc_entries_per_group(dat);
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unsigned long group = bmap->b_inode->i_ino / entries_per_group;
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return group * entries_per_group +
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(bmap->b_inode->i_ino % NILFS_BMAP_GROUP_DIV) *
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(entries_per_group / NILFS_BMAP_GROUP_DIV);
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}
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static struct lock_class_key nilfs_bmap_dat_lock_key;
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static struct lock_class_key nilfs_bmap_mdt_lock_key;
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/**
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* nilfs_bmap_read - read a bmap from an inode
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* @bmap: bmap
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* @raw_inode: on-disk inode
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*
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* Description: nilfs_bmap_read() initializes the bmap @bmap.
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*
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* Return Value: On success, 0 is returned. On error, the following negative
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* error code is returned.
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*
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* %-ENOMEM - Insufficient amount of memory available.
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*/
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int nilfs_bmap_read(struct nilfs_bmap *bmap, struct nilfs_inode *raw_inode)
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{
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if (raw_inode == NULL)
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memset(bmap->b_u.u_data, 0, NILFS_BMAP_SIZE);
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else
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memcpy(bmap->b_u.u_data, raw_inode->i_bmap, NILFS_BMAP_SIZE);
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init_rwsem(&bmap->b_sem);
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bmap->b_state = 0;
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bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode;
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switch (bmap->b_inode->i_ino) {
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case NILFS_DAT_INO:
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bmap->b_ptr_type = NILFS_BMAP_PTR_P;
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bmap->b_last_allocated_key = 0;
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bmap->b_last_allocated_ptr = NILFS_BMAP_NEW_PTR_INIT;
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lockdep_set_class(&bmap->b_sem, &nilfs_bmap_dat_lock_key);
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|
break;
|
|
case NILFS_CPFILE_INO:
|
|
case NILFS_SUFILE_INO:
|
|
bmap->b_ptr_type = NILFS_BMAP_PTR_VS;
|
|
bmap->b_last_allocated_key = 0;
|
|
bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR;
|
|
lockdep_set_class(&bmap->b_sem, &nilfs_bmap_mdt_lock_key);
|
|
break;
|
|
case NILFS_IFILE_INO:
|
|
lockdep_set_class(&bmap->b_sem, &nilfs_bmap_mdt_lock_key);
|
|
/* Fall through */
|
|
default:
|
|
bmap->b_ptr_type = NILFS_BMAP_PTR_VM;
|
|
bmap->b_last_allocated_key = 0;
|
|
bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR;
|
|
break;
|
|
}
|
|
|
|
return (bmap->b_u.u_flags & NILFS_BMAP_LARGE) ?
|
|
nilfs_btree_init(bmap) : nilfs_direct_init(bmap);
|
|
}
|
|
|
|
/**
|
|
* nilfs_bmap_write - write back a bmap to an inode
|
|
* @bmap: bmap
|
|
* @raw_inode: on-disk inode
|
|
*
|
|
* Description: nilfs_bmap_write() stores @bmap in @raw_inode.
|
|
*/
|
|
void nilfs_bmap_write(struct nilfs_bmap *bmap, struct nilfs_inode *raw_inode)
|
|
{
|
|
down_write(&bmap->b_sem);
|
|
memcpy(raw_inode->i_bmap, bmap->b_u.u_data,
|
|
NILFS_INODE_BMAP_SIZE * sizeof(__le64));
|
|
if (bmap->b_inode->i_ino == NILFS_DAT_INO)
|
|
bmap->b_last_allocated_ptr = NILFS_BMAP_NEW_PTR_INIT;
|
|
|
|
up_write(&bmap->b_sem);
|
|
}
|
|
|
|
void nilfs_bmap_init_gc(struct nilfs_bmap *bmap)
|
|
{
|
|
memset(&bmap->b_u, 0, NILFS_BMAP_SIZE);
|
|
init_rwsem(&bmap->b_sem);
|
|
bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode;
|
|
bmap->b_ptr_type = NILFS_BMAP_PTR_U;
|
|
bmap->b_last_allocated_key = 0;
|
|
bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR;
|
|
bmap->b_state = 0;
|
|
nilfs_btree_init_gc(bmap);
|
|
}
|
|
|
|
void nilfs_bmap_save(const struct nilfs_bmap *bmap,
|
|
struct nilfs_bmap_store *store)
|
|
{
|
|
memcpy(store->data, bmap->b_u.u_data, sizeof(store->data));
|
|
store->last_allocated_key = bmap->b_last_allocated_key;
|
|
store->last_allocated_ptr = bmap->b_last_allocated_ptr;
|
|
store->state = bmap->b_state;
|
|
}
|
|
|
|
void nilfs_bmap_restore(struct nilfs_bmap *bmap,
|
|
const struct nilfs_bmap_store *store)
|
|
{
|
|
memcpy(bmap->b_u.u_data, store->data, sizeof(store->data));
|
|
bmap->b_last_allocated_key = store->last_allocated_key;
|
|
bmap->b_last_allocated_ptr = store->last_allocated_ptr;
|
|
bmap->b_state = store->state;
|
|
}
|