656 lines
18 KiB
C
656 lines
18 KiB
C
/*
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* sufile.c - NILFS segment usage file.
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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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* Rivised by Ryusuke Konishi <ryusuke@osrg.net>.
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*/
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/buffer_head.h>
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#include <linux/errno.h>
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#include <linux/nilfs2_fs.h>
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#include "mdt.h"
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#include "sufile.h"
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static inline unsigned long
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nilfs_sufile_segment_usages_per_block(const struct inode *sufile)
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{
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return NILFS_MDT(sufile)->mi_entries_per_block;
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}
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static unsigned long
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nilfs_sufile_get_blkoff(const struct inode *sufile, __u64 segnum)
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{
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__u64 t = segnum + NILFS_MDT(sufile)->mi_first_entry_offset;
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do_div(t, nilfs_sufile_segment_usages_per_block(sufile));
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return (unsigned long)t;
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}
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static unsigned long
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nilfs_sufile_get_offset(const struct inode *sufile, __u64 segnum)
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{
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__u64 t = segnum + NILFS_MDT(sufile)->mi_first_entry_offset;
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return do_div(t, nilfs_sufile_segment_usages_per_block(sufile));
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}
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static unsigned long
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nilfs_sufile_segment_usages_in_block(const struct inode *sufile, __u64 curr,
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__u64 max)
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{
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return min_t(unsigned long,
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nilfs_sufile_segment_usages_per_block(sufile) -
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nilfs_sufile_get_offset(sufile, curr),
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max - curr + 1);
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}
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static inline struct nilfs_sufile_header *
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nilfs_sufile_block_get_header(const struct inode *sufile,
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struct buffer_head *bh,
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void *kaddr)
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{
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return kaddr + bh_offset(bh);
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}
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static struct nilfs_segment_usage *
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nilfs_sufile_block_get_segment_usage(const struct inode *sufile, __u64 segnum,
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struct buffer_head *bh, void *kaddr)
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{
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return kaddr + bh_offset(bh) +
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nilfs_sufile_get_offset(sufile, segnum) *
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NILFS_MDT(sufile)->mi_entry_size;
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}
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static inline int nilfs_sufile_get_header_block(struct inode *sufile,
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struct buffer_head **bhp)
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{
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return nilfs_mdt_get_block(sufile, 0, 0, NULL, bhp);
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}
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static inline int
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nilfs_sufile_get_segment_usage_block(struct inode *sufile, __u64 segnum,
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int create, struct buffer_head **bhp)
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{
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return nilfs_mdt_get_block(sufile,
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nilfs_sufile_get_blkoff(sufile, segnum),
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create, NULL, bhp);
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}
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static void nilfs_sufile_mod_counter(struct buffer_head *header_bh,
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u64 ncleanadd, u64 ndirtyadd)
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{
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struct nilfs_sufile_header *header;
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void *kaddr;
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kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
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header = kaddr + bh_offset(header_bh);
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le64_add_cpu(&header->sh_ncleansegs, ncleanadd);
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le64_add_cpu(&header->sh_ndirtysegs, ndirtyadd);
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kunmap_atomic(kaddr, KM_USER0);
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nilfs_mdt_mark_buffer_dirty(header_bh);
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}
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/**
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* nilfs_sufile_updatev - modify multiple segment usages at a time
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* @sufile: inode of segment usage file
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* @segnumv: array of segment numbers
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* @nsegs: size of @segnumv array
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* @create: creation flag
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* @ndone: place to store number of modified segments on @segnumv
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* @dofunc: primitive operation for the update
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*
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* Description: nilfs_sufile_updatev() repeatedly calls @dofunc
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* against the given array of segments. The @dofunc is called with
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* buffers of a header block and the sufile block in which the target
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* segment usage entry is contained. If @ndone is given, the number
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* of successfully modified segments from the head is stored in the
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* place @ndone points to.
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*
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* Return Value: On success, zero is returned. On error, one of the
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* 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 - Given segment usage is in hole block (may be returned if
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* @create is zero)
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*
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* %-EINVAL - Invalid segment usage number
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*/
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int nilfs_sufile_updatev(struct inode *sufile, __u64 *segnumv, size_t nsegs,
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int create, size_t *ndone,
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void (*dofunc)(struct inode *, __u64,
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struct buffer_head *,
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struct buffer_head *))
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{
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struct buffer_head *header_bh, *bh;
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unsigned long blkoff, prev_blkoff;
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__u64 *seg;
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size_t nerr = 0, n = 0;
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int ret = 0;
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if (unlikely(nsegs == 0))
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goto out;
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down_write(&NILFS_MDT(sufile)->mi_sem);
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for (seg = segnumv; seg < segnumv + nsegs; seg++) {
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if (unlikely(*seg >= nilfs_sufile_get_nsegments(sufile))) {
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printk(KERN_WARNING
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"%s: invalid segment number: %llu\n", __func__,
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(unsigned long long)*seg);
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nerr++;
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}
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}
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if (nerr > 0) {
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ret = -EINVAL;
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goto out_sem;
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}
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ret = nilfs_sufile_get_header_block(sufile, &header_bh);
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if (ret < 0)
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goto out_sem;
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seg = segnumv;
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blkoff = nilfs_sufile_get_blkoff(sufile, *seg);
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ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh);
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if (ret < 0)
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goto out_header;
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for (;;) {
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dofunc(sufile, *seg, header_bh, bh);
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if (++seg >= segnumv + nsegs)
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break;
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prev_blkoff = blkoff;
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blkoff = nilfs_sufile_get_blkoff(sufile, *seg);
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if (blkoff == prev_blkoff)
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continue;
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/* get different block */
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brelse(bh);
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ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh);
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if (unlikely(ret < 0))
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goto out_header;
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}
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brelse(bh);
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out_header:
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n = seg - segnumv;
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brelse(header_bh);
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out_sem:
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up_write(&NILFS_MDT(sufile)->mi_sem);
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out:
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if (ndone)
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*ndone = n;
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return ret;
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}
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int nilfs_sufile_update(struct inode *sufile, __u64 segnum, int create,
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void (*dofunc)(struct inode *, __u64,
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struct buffer_head *,
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struct buffer_head *))
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{
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struct buffer_head *header_bh, *bh;
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int ret;
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if (unlikely(segnum >= nilfs_sufile_get_nsegments(sufile))) {
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printk(KERN_WARNING "%s: invalid segment number: %llu\n",
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__func__, (unsigned long long)segnum);
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return -EINVAL;
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}
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down_write(&NILFS_MDT(sufile)->mi_sem);
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ret = nilfs_sufile_get_header_block(sufile, &header_bh);
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if (ret < 0)
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goto out_sem;
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ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, create, &bh);
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if (!ret) {
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dofunc(sufile, segnum, header_bh, bh);
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brelse(bh);
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}
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brelse(header_bh);
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out_sem:
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up_write(&NILFS_MDT(sufile)->mi_sem);
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return ret;
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}
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/**
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* nilfs_sufile_alloc - allocate a segment
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* @sufile: inode of segment usage file
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* @segnump: pointer to segment number
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*
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* Description: nilfs_sufile_alloc() allocates a clean segment.
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*
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* Return Value: On success, 0 is returned and the segment number of the
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* allocated segment is stored in the place pointed by @segnump. 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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* %-ENOSPC - No clean segment left.
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*/
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int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump)
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{
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struct buffer_head *header_bh, *su_bh;
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struct nilfs_sufile_header *header;
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struct nilfs_segment_usage *su;
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size_t susz = NILFS_MDT(sufile)->mi_entry_size;
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__u64 segnum, maxsegnum, last_alloc;
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void *kaddr;
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unsigned long nsegments, ncleansegs, nsus;
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int ret, i, j;
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down_write(&NILFS_MDT(sufile)->mi_sem);
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ret = nilfs_sufile_get_header_block(sufile, &header_bh);
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if (ret < 0)
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goto out_sem;
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kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
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header = nilfs_sufile_block_get_header(sufile, header_bh, kaddr);
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ncleansegs = le64_to_cpu(header->sh_ncleansegs);
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last_alloc = le64_to_cpu(header->sh_last_alloc);
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kunmap_atomic(kaddr, KM_USER0);
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nsegments = nilfs_sufile_get_nsegments(sufile);
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segnum = last_alloc + 1;
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maxsegnum = nsegments - 1;
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for (i = 0; i < nsegments; i += nsus) {
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if (segnum >= nsegments) {
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/* wrap around */
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segnum = 0;
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maxsegnum = last_alloc;
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}
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ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 1,
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&su_bh);
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if (ret < 0)
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goto out_header;
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kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
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su = nilfs_sufile_block_get_segment_usage(
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sufile, segnum, su_bh, kaddr);
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nsus = nilfs_sufile_segment_usages_in_block(
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sufile, segnum, maxsegnum);
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for (j = 0; j < nsus; j++, su = (void *)su + susz, segnum++) {
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if (!nilfs_segment_usage_clean(su))
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continue;
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/* found a clean segment */
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nilfs_segment_usage_set_dirty(su);
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kunmap_atomic(kaddr, KM_USER0);
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kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
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header = nilfs_sufile_block_get_header(
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sufile, header_bh, kaddr);
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le64_add_cpu(&header->sh_ncleansegs, -1);
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le64_add_cpu(&header->sh_ndirtysegs, 1);
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header->sh_last_alloc = cpu_to_le64(segnum);
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kunmap_atomic(kaddr, KM_USER0);
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nilfs_mdt_mark_buffer_dirty(header_bh);
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nilfs_mdt_mark_buffer_dirty(su_bh);
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nilfs_mdt_mark_dirty(sufile);
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brelse(su_bh);
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*segnump = segnum;
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goto out_header;
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}
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kunmap_atomic(kaddr, KM_USER0);
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brelse(su_bh);
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}
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/* no segments left */
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ret = -ENOSPC;
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out_header:
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brelse(header_bh);
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out_sem:
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up_write(&NILFS_MDT(sufile)->mi_sem);
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return ret;
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}
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void nilfs_sufile_do_cancel_free(struct inode *sufile, __u64 segnum,
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struct buffer_head *header_bh,
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struct buffer_head *su_bh)
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{
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struct nilfs_segment_usage *su;
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void *kaddr;
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kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
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su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
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if (unlikely(!nilfs_segment_usage_clean(su))) {
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printk(KERN_WARNING "%s: segment %llu must be clean\n",
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__func__, (unsigned long long)segnum);
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kunmap_atomic(kaddr, KM_USER0);
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return;
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}
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nilfs_segment_usage_set_dirty(su);
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kunmap_atomic(kaddr, KM_USER0);
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nilfs_sufile_mod_counter(header_bh, -1, 1);
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nilfs_mdt_mark_buffer_dirty(su_bh);
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nilfs_mdt_mark_dirty(sufile);
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}
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void nilfs_sufile_do_scrap(struct inode *sufile, __u64 segnum,
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struct buffer_head *header_bh,
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struct buffer_head *su_bh)
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{
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struct nilfs_segment_usage *su;
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void *kaddr;
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int clean, dirty;
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kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
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su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
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if (su->su_flags == cpu_to_le32(1UL << NILFS_SEGMENT_USAGE_DIRTY) &&
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su->su_nblocks == cpu_to_le32(0)) {
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kunmap_atomic(kaddr, KM_USER0);
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return;
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}
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clean = nilfs_segment_usage_clean(su);
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dirty = nilfs_segment_usage_dirty(su);
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/* make the segment garbage */
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su->su_lastmod = cpu_to_le64(0);
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su->su_nblocks = cpu_to_le32(0);
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su->su_flags = cpu_to_le32(1UL << NILFS_SEGMENT_USAGE_DIRTY);
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kunmap_atomic(kaddr, KM_USER0);
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nilfs_sufile_mod_counter(header_bh, clean ? (u64)-1 : 0, dirty ? 0 : 1);
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nilfs_mdt_mark_buffer_dirty(su_bh);
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nilfs_mdt_mark_dirty(sufile);
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}
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void nilfs_sufile_do_free(struct inode *sufile, __u64 segnum,
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struct buffer_head *header_bh,
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struct buffer_head *su_bh)
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{
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struct nilfs_segment_usage *su;
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void *kaddr;
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int sudirty;
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kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
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su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
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if (nilfs_segment_usage_clean(su)) {
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printk(KERN_WARNING "%s: segment %llu is already clean\n",
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__func__, (unsigned long long)segnum);
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kunmap_atomic(kaddr, KM_USER0);
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return;
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}
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WARN_ON(nilfs_segment_usage_error(su));
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WARN_ON(!nilfs_segment_usage_dirty(su));
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sudirty = nilfs_segment_usage_dirty(su);
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nilfs_segment_usage_set_clean(su);
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kunmap_atomic(kaddr, KM_USER0);
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nilfs_mdt_mark_buffer_dirty(su_bh);
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nilfs_sufile_mod_counter(header_bh, 1, sudirty ? (u64)-1 : 0);
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nilfs_mdt_mark_dirty(sufile);
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}
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/**
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* nilfs_sufile_get_segment_usage - get a segment usage
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* @sufile: inode of segment usage file
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* @segnum: segment number
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* @sup: pointer to segment usage
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* @bhp: pointer to buffer head
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*
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* Description: nilfs_sufile_get_segment_usage() acquires the segment usage
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* specified by @segnum.
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*
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* Return Value: On success, 0 is returned, and the segment usage and the
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* buffer head of the buffer on which the segment usage is located are stored
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* in the place pointed by @sup and @bhp, respectively. On error, one of the
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* 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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* %-EINVAL - Invalid segment usage number.
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*/
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int nilfs_sufile_get_segment_usage(struct inode *sufile, __u64 segnum,
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struct nilfs_segment_usage **sup,
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struct buffer_head **bhp)
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{
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struct buffer_head *bh;
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struct nilfs_segment_usage *su;
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void *kaddr;
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int ret;
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/* segnum is 0 origin */
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if (segnum >= nilfs_sufile_get_nsegments(sufile))
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return -EINVAL;
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down_write(&NILFS_MDT(sufile)->mi_sem);
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ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 1, &bh);
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if (ret < 0)
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goto out_sem;
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kaddr = kmap(bh->b_page);
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su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr);
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if (nilfs_segment_usage_error(su)) {
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kunmap(bh->b_page);
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brelse(bh);
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ret = -EINVAL;
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goto out_sem;
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}
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if (sup != NULL)
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*sup = su;
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*bhp = bh;
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out_sem:
|
|
up_write(&NILFS_MDT(sufile)->mi_sem);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* nilfs_sufile_put_segment_usage - put a segment usage
|
|
* @sufile: inode of segment usage file
|
|
* @segnum: segment number
|
|
* @bh: buffer head
|
|
*
|
|
* Description: nilfs_sufile_put_segment_usage() releases the segment usage
|
|
* specified by @segnum. @bh must be the buffer head which have been returned
|
|
* by a previous call to nilfs_sufile_get_segment_usage() with @segnum.
|
|
*/
|
|
void nilfs_sufile_put_segment_usage(struct inode *sufile, __u64 segnum,
|
|
struct buffer_head *bh)
|
|
{
|
|
kunmap(bh->b_page);
|
|
brelse(bh);
|
|
}
|
|
|
|
/**
|
|
* nilfs_sufile_get_stat - get segment usage statistics
|
|
* @sufile: inode of segment usage file
|
|
* @stat: pointer to a structure of segment usage statistics
|
|
*
|
|
* Description: nilfs_sufile_get_stat() returns information about segment
|
|
* usage.
|
|
*
|
|
* Return Value: On success, 0 is returned, and segment usage information is
|
|
* stored in the place pointed by @stat. On error, one of the following
|
|
* negative error codes is returned.
|
|
*
|
|
* %-EIO - I/O error.
|
|
*
|
|
* %-ENOMEM - Insufficient amount of memory available.
|
|
*/
|
|
int nilfs_sufile_get_stat(struct inode *sufile, struct nilfs_sustat *sustat)
|
|
{
|
|
struct buffer_head *header_bh;
|
|
struct nilfs_sufile_header *header;
|
|
struct the_nilfs *nilfs = NILFS_MDT(sufile)->mi_nilfs;
|
|
void *kaddr;
|
|
int ret;
|
|
|
|
down_read(&NILFS_MDT(sufile)->mi_sem);
|
|
|
|
ret = nilfs_sufile_get_header_block(sufile, &header_bh);
|
|
if (ret < 0)
|
|
goto out_sem;
|
|
|
|
kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
|
|
header = nilfs_sufile_block_get_header(sufile, header_bh, kaddr);
|
|
sustat->ss_nsegs = nilfs_sufile_get_nsegments(sufile);
|
|
sustat->ss_ncleansegs = le64_to_cpu(header->sh_ncleansegs);
|
|
sustat->ss_ndirtysegs = le64_to_cpu(header->sh_ndirtysegs);
|
|
sustat->ss_ctime = nilfs->ns_ctime;
|
|
sustat->ss_nongc_ctime = nilfs->ns_nongc_ctime;
|
|
spin_lock(&nilfs->ns_last_segment_lock);
|
|
sustat->ss_prot_seq = nilfs->ns_prot_seq;
|
|
spin_unlock(&nilfs->ns_last_segment_lock);
|
|
kunmap_atomic(kaddr, KM_USER0);
|
|
brelse(header_bh);
|
|
|
|
out_sem:
|
|
up_read(&NILFS_MDT(sufile)->mi_sem);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* nilfs_sufile_get_ncleansegs - get the number of clean segments
|
|
* @sufile: inode of segment usage file
|
|
* @nsegsp: pointer to the number of clean segments
|
|
*
|
|
* Description: nilfs_sufile_get_ncleansegs() acquires the number of clean
|
|
* segments.
|
|
*
|
|
* Return Value: On success, 0 is returned and the number of clean segments is
|
|
* stored in the place pointed by @nsegsp. On error, one of the following
|
|
* negative error codes is returned.
|
|
*
|
|
* %-EIO - I/O error.
|
|
*
|
|
* %-ENOMEM - Insufficient amount of memory available.
|
|
*/
|
|
int nilfs_sufile_get_ncleansegs(struct inode *sufile, unsigned long *nsegsp)
|
|
{
|
|
struct nilfs_sustat sustat;
|
|
int ret;
|
|
|
|
ret = nilfs_sufile_get_stat(sufile, &sustat);
|
|
if (ret == 0)
|
|
*nsegsp = sustat.ss_ncleansegs;
|
|
return ret;
|
|
}
|
|
|
|
void nilfs_sufile_do_set_error(struct inode *sufile, __u64 segnum,
|
|
struct buffer_head *header_bh,
|
|
struct buffer_head *su_bh)
|
|
{
|
|
struct nilfs_segment_usage *su;
|
|
void *kaddr;
|
|
int suclean;
|
|
|
|
kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
|
|
su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
|
|
if (nilfs_segment_usage_error(su)) {
|
|
kunmap_atomic(kaddr, KM_USER0);
|
|
return;
|
|
}
|
|
suclean = nilfs_segment_usage_clean(su);
|
|
nilfs_segment_usage_set_error(su);
|
|
kunmap_atomic(kaddr, KM_USER0);
|
|
|
|
if (suclean)
|
|
nilfs_sufile_mod_counter(header_bh, -1, 0);
|
|
nilfs_mdt_mark_buffer_dirty(su_bh);
|
|
nilfs_mdt_mark_dirty(sufile);
|
|
}
|
|
|
|
/**
|
|
* nilfs_sufile_get_suinfo -
|
|
* @sufile: inode of segment usage file
|
|
* @segnum: segment number to start looking
|
|
* @si: array of suinfo
|
|
* @nsi: size of suinfo array
|
|
*
|
|
* Description:
|
|
*
|
|
* Return Value: On success, 0 is returned and .... On error, one of the
|
|
* following negative error codes is returned.
|
|
*
|
|
* %-EIO - I/O error.
|
|
*
|
|
* %-ENOMEM - Insufficient amount of memory available.
|
|
*/
|
|
ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum,
|
|
struct nilfs_suinfo *si, size_t nsi)
|
|
{
|
|
struct buffer_head *su_bh;
|
|
struct nilfs_segment_usage *su;
|
|
size_t susz = NILFS_MDT(sufile)->mi_entry_size;
|
|
struct the_nilfs *nilfs = NILFS_MDT(sufile)->mi_nilfs;
|
|
void *kaddr;
|
|
unsigned long nsegs, segusages_per_block;
|
|
ssize_t n;
|
|
int ret, i, j;
|
|
|
|
down_read(&NILFS_MDT(sufile)->mi_sem);
|
|
|
|
segusages_per_block = nilfs_sufile_segment_usages_per_block(sufile);
|
|
nsegs = min_t(unsigned long,
|
|
nilfs_sufile_get_nsegments(sufile) - segnum,
|
|
nsi);
|
|
for (i = 0; i < nsegs; i += n, segnum += n) {
|
|
n = min_t(unsigned long,
|
|
segusages_per_block -
|
|
nilfs_sufile_get_offset(sufile, segnum),
|
|
nsegs - i);
|
|
ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0,
|
|
&su_bh);
|
|
if (ret < 0) {
|
|
if (ret != -ENOENT)
|
|
goto out;
|
|
/* hole */
|
|
memset(&si[i], 0, sizeof(struct nilfs_suinfo) * n);
|
|
continue;
|
|
}
|
|
|
|
kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
|
|
su = nilfs_sufile_block_get_segment_usage(
|
|
sufile, segnum, su_bh, kaddr);
|
|
for (j = 0; j < n; j++, su = (void *)su + susz) {
|
|
si[i + j].sui_lastmod = le64_to_cpu(su->su_lastmod);
|
|
si[i + j].sui_nblocks = le32_to_cpu(su->su_nblocks);
|
|
si[i + j].sui_flags = le32_to_cpu(su->su_flags) &
|
|
~(1UL << NILFS_SEGMENT_USAGE_ACTIVE);
|
|
if (nilfs_segment_is_active(nilfs, segnum + j))
|
|
si[i + j].sui_flags |=
|
|
(1UL << NILFS_SEGMENT_USAGE_ACTIVE);
|
|
}
|
|
kunmap_atomic(kaddr, KM_USER0);
|
|
brelse(su_bh);
|
|
}
|
|
ret = nsegs;
|
|
|
|
out:
|
|
up_read(&NILFS_MDT(sufile)->mi_sem);
|
|
return ret;
|
|
}
|