594 lines
14 KiB
C
594 lines
14 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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*/
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/crc32.h>
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#include "gfs2.h"
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#include "lm_interface.h"
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#include "incore.h"
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#include "bmap.h"
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#include "glock.h"
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#include "log.h"
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#include "lops.h"
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#include "meta_io.h"
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#include "util.h"
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#include "dir.h"
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#define PULL 1
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/**
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* gfs2_struct2blk - compute stuff
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* @sdp: the filesystem
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* @nstruct: the number of structures
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* @ssize: the size of the structures
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*
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* Compute the number of log descriptor blocks needed to hold a certain number
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* of structures of a certain size.
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*
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* Returns: the number of blocks needed (minimum is always 1)
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*/
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unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct,
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unsigned int ssize)
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{
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unsigned int blks;
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unsigned int first, second;
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blks = 1;
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first = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) /
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ssize;
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if (nstruct > first) {
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second = (sdp->sd_sb.sb_bsize -
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sizeof(struct gfs2_meta_header)) / ssize;
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blks += DIV_ROUND_UP(nstruct - first, second);
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}
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return blks;
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}
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void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags)
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{
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struct list_head *head = &sdp->sd_ail1_list;
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u64 sync_gen;
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struct list_head *first, *tmp;
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struct gfs2_ail *first_ai, *ai;
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gfs2_log_lock(sdp);
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if (list_empty(head)) {
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gfs2_log_unlock(sdp);
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return;
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}
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sync_gen = sdp->sd_ail_sync_gen++;
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first = head->prev;
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first_ai = list_entry(first, struct gfs2_ail, ai_list);
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first_ai->ai_sync_gen = sync_gen;
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gfs2_ail1_start_one(sdp, first_ai);
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if (flags & DIO_ALL)
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first = NULL;
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for (;;) {
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if (first && (head->prev != first ||
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gfs2_ail1_empty_one(sdp, first_ai, 0)))
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break;
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for (tmp = head->prev; tmp != head; tmp = tmp->prev) {
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ai = list_entry(tmp, struct gfs2_ail, ai_list);
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if (ai->ai_sync_gen >= sync_gen)
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continue;
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ai->ai_sync_gen = sync_gen;
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gfs2_ail1_start_one(sdp, ai);
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break;
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}
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if (tmp == head)
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break;
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}
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gfs2_log_unlock(sdp);
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}
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int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags)
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{
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struct gfs2_ail *ai, *s;
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int ret;
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gfs2_log_lock(sdp);
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list_for_each_entry_safe_reverse(ai, s, &sdp->sd_ail1_list, ai_list) {
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if (gfs2_ail1_empty_one(sdp, ai, flags))
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list_move(&ai->ai_list, &sdp->sd_ail2_list);
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else if (!(flags & DIO_ALL))
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break;
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}
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ret = list_empty(&sdp->sd_ail1_list);
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gfs2_log_unlock(sdp);
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return ret;
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}
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static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail)
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{
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struct gfs2_ail *ai, *safe;
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unsigned int old_tail = sdp->sd_log_tail;
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int wrap = (new_tail < old_tail);
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int a, b, rm;
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gfs2_log_lock(sdp);
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list_for_each_entry_safe(ai, safe, &sdp->sd_ail2_list, ai_list) {
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a = (old_tail <= ai->ai_first);
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b = (ai->ai_first < new_tail);
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rm = (wrap) ? (a || b) : (a && b);
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if (!rm)
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continue;
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gfs2_ail2_empty_one(sdp, ai);
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list_del(&ai->ai_list);
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gfs2_assert_warn(sdp, list_empty(&ai->ai_ail1_list));
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gfs2_assert_warn(sdp, list_empty(&ai->ai_ail2_list));
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kfree(ai);
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}
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gfs2_log_unlock(sdp);
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}
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/**
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* gfs2_log_reserve - Make a log reservation
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* @sdp: The GFS2 superblock
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* @blks: The number of blocks to reserve
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*
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* Returns: errno
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*/
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int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks)
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{
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unsigned int try = 0;
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if (gfs2_assert_warn(sdp, blks) ||
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gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks))
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return -EINVAL;
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mutex_lock(&sdp->sd_log_reserve_mutex);
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gfs2_log_lock(sdp);
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while(sdp->sd_log_blks_free <= blks) {
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gfs2_log_unlock(sdp);
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gfs2_ail1_empty(sdp, 0);
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gfs2_log_flush(sdp, NULL);
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if (try++)
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gfs2_ail1_start(sdp, 0);
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gfs2_log_lock(sdp);
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}
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sdp->sd_log_blks_free -= blks;
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gfs2_log_unlock(sdp);
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mutex_unlock(&sdp->sd_log_reserve_mutex);
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down_read(&sdp->sd_log_flush_lock);
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return 0;
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}
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/**
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* gfs2_log_release - Release a given number of log blocks
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* @sdp: The GFS2 superblock
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* @blks: The number of blocks
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*
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*/
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void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks)
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{
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gfs2_log_lock(sdp);
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sdp->sd_log_blks_free += blks;
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gfs2_assert_withdraw(sdp,
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sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks);
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gfs2_log_unlock(sdp);
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up_read(&sdp->sd_log_flush_lock);
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}
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static u64 log_bmap(struct gfs2_sbd *sdp, unsigned int lbn)
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{
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int new = 0;
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u64 dbn;
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int error;
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int bdy;
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error = gfs2_block_map(sdp->sd_jdesc->jd_inode, lbn, &new, &dbn, &bdy);
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if (error || !dbn)
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printk(KERN_INFO "error=%d, dbn=%llu lbn=%u", error, (unsigned long long)dbn, lbn);
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gfs2_assert_withdraw(sdp, !error && dbn);
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return dbn;
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}
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/**
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* log_distance - Compute distance between two journal blocks
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* @sdp: The GFS2 superblock
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* @newer: The most recent journal block of the pair
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* @older: The older journal block of the pair
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*
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* Compute the distance (in the journal direction) between two
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* blocks in the journal
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*
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* Returns: the distance in blocks
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*/
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static inline unsigned int log_distance(struct gfs2_sbd *sdp,
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unsigned int newer,
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unsigned int older)
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{
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int dist;
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dist = newer - older;
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if (dist < 0)
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dist += sdp->sd_jdesc->jd_blocks;
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return dist;
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}
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static unsigned int current_tail(struct gfs2_sbd *sdp)
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{
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struct gfs2_ail *ai;
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unsigned int tail;
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gfs2_log_lock(sdp);
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if (list_empty(&sdp->sd_ail1_list))
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tail = sdp->sd_log_head;
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else {
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ai = list_entry(sdp->sd_ail1_list.prev, struct gfs2_ail,
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ai_list);
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tail = ai->ai_first;
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}
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gfs2_log_unlock(sdp);
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return tail;
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}
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static inline void log_incr_head(struct gfs2_sbd *sdp)
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{
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if (sdp->sd_log_flush_head == sdp->sd_log_tail)
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gfs2_assert_withdraw(sdp,
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sdp->sd_log_flush_head == sdp->sd_log_head);
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if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) {
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sdp->sd_log_flush_head = 0;
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sdp->sd_log_flush_wrapped = 1;
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}
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}
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/**
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* gfs2_log_get_buf - Get and initialize a buffer to use for log control data
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* @sdp: The GFS2 superblock
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*
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* Returns: the buffer_head
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*/
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struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp)
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{
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u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
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struct gfs2_log_buf *lb;
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struct buffer_head *bh;
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lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL);
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list_add(&lb->lb_list, &sdp->sd_log_flush_list);
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bh = lb->lb_bh = sb_getblk(sdp->sd_vfs, blkno);
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lock_buffer(bh);
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memset(bh->b_data, 0, bh->b_size);
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set_buffer_uptodate(bh);
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clear_buffer_dirty(bh);
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unlock_buffer(bh);
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log_incr_head(sdp);
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return bh;
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}
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/**
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* gfs2_log_fake_buf - Build a fake buffer head to write metadata buffer to log
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* @sdp: the filesystem
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* @data: the data the buffer_head should point to
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*
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* Returns: the log buffer descriptor
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*/
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struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp,
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struct buffer_head *real)
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{
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u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
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struct gfs2_log_buf *lb;
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struct buffer_head *bh;
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lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL);
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list_add(&lb->lb_list, &sdp->sd_log_flush_list);
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lb->lb_real = real;
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bh = lb->lb_bh = alloc_buffer_head(GFP_NOFS | __GFP_NOFAIL);
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atomic_set(&bh->b_count, 1);
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bh->b_state = (1 << BH_Mapped) | (1 << BH_Uptodate);
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set_bh_page(bh, real->b_page, bh_offset(real));
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bh->b_blocknr = blkno;
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bh->b_size = sdp->sd_sb.sb_bsize;
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bh->b_bdev = sdp->sd_vfs->s_bdev;
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log_incr_head(sdp);
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return bh;
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}
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static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail, int pull)
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{
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unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail);
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ail2_empty(sdp, new_tail);
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gfs2_log_lock(sdp);
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sdp->sd_log_blks_free += dist - (pull ? 1 : 0);
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/* printk(KERN_INFO "pull tail refunding %u blocks (%u left) pull=%d\n", dist - (pull ? 1 : 0), sdp->sd_log_blks_free, pull); */
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gfs2_assert_withdraw(sdp,
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sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks);
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gfs2_log_unlock(sdp);
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sdp->sd_log_tail = new_tail;
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}
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/**
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* log_write_header - Get and initialize a journal header buffer
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* @sdp: The GFS2 superblock
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*
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* Returns: the initialized log buffer descriptor
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*/
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static void log_write_header(struct gfs2_sbd *sdp, u32 flags, int pull)
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{
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u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
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struct buffer_head *bh;
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struct gfs2_log_header *lh;
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unsigned int tail;
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u32 hash;
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/* printk(KERN_INFO "log write header start (flags=%08x, pull=%d)\n", flags, pull); */
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bh = sb_getblk(sdp->sd_vfs, blkno);
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lock_buffer(bh);
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memset(bh->b_data, 0, bh->b_size);
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set_buffer_uptodate(bh);
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clear_buffer_dirty(bh);
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unlock_buffer(bh);
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gfs2_ail1_empty(sdp, 0);
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tail = current_tail(sdp);
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lh = (struct gfs2_log_header *)bh->b_data;
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memset(lh, 0, sizeof(struct gfs2_log_header));
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lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
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lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH);
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lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH);
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lh->lh_sequence = cpu_to_be64(sdp->sd_log_sequence++);
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lh->lh_flags = cpu_to_be32(flags);
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lh->lh_tail = cpu_to_be32(tail);
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lh->lh_blkno = cpu_to_be32(sdp->sd_log_flush_head);
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hash = gfs2_disk_hash(bh->b_data, sizeof(struct gfs2_log_header));
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lh->lh_hash = cpu_to_be32(hash);
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set_buffer_dirty(bh);
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if (sync_dirty_buffer(bh))
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gfs2_io_error_bh(sdp, bh);
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brelse(bh);
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if (sdp->sd_log_tail != tail)
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log_pull_tail(sdp, tail, pull);
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else
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gfs2_assert_withdraw(sdp, !pull);
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sdp->sd_log_idle = (tail == sdp->sd_log_flush_head);
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log_incr_head(sdp);
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/* printk(KERN_INFO "log write header out\n"); */
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}
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static void log_flush_commit(struct gfs2_sbd *sdp)
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{
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struct list_head *head = &sdp->sd_log_flush_list;
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struct gfs2_log_buf *lb;
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struct buffer_head *bh;
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while (!list_empty(head)) {
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lb = list_entry(head->next, struct gfs2_log_buf, lb_list);
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list_del(&lb->lb_list);
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bh = lb->lb_bh;
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wait_on_buffer(bh);
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if (!buffer_uptodate(bh))
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gfs2_io_error_bh(sdp, bh);
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if (lb->lb_real) {
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while (atomic_read(&bh->b_count) != 1) /* Grrrr... */
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schedule();
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free_buffer_head(bh);
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} else
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brelse(bh);
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kfree(lb);
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}
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log_write_header(sdp, 0, 0);
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}
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/**
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* gfs2_log_flush - flush incore transaction(s)
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* @sdp: the filesystem
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* @gl: The glock structure to flush. If NULL, flush the whole incore log
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*
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*/
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void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl)
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{
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struct gfs2_ail *ai;
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down_write(&sdp->sd_log_flush_lock);
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if (gl) {
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gfs2_log_lock(sdp);
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if (list_empty(&gl->gl_le.le_list)) {
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gfs2_log_unlock(sdp);
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up_write(&sdp->sd_log_flush_lock);
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return;
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}
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gfs2_log_unlock(sdp);
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}
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ai = kzalloc(sizeof(struct gfs2_ail), GFP_NOFS | __GFP_NOFAIL);
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INIT_LIST_HEAD(&ai->ai_ail1_list);
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INIT_LIST_HEAD(&ai->ai_ail2_list);
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gfs2_assert_withdraw(sdp,
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sdp->sd_log_num_buf == sdp->sd_log_commited_buf);
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gfs2_assert_withdraw(sdp,
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sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke);
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sdp->sd_log_flush_head = sdp->sd_log_head;
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sdp->sd_log_flush_wrapped = 0;
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ai->ai_first = sdp->sd_log_flush_head;
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lops_before_commit(sdp);
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if (!list_empty(&sdp->sd_log_flush_list))
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log_flush_commit(sdp);
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else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle)
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log_write_header(sdp, 0, PULL);
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lops_after_commit(sdp, ai);
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sdp->sd_log_head = sdp->sd_log_flush_head;
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/* printk(KERN_INFO "sd_log_num_hdrs %u\n", sdp->sd_log_num_hdrs); */
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sdp->sd_log_blks_free -= sdp->sd_log_num_hdrs;
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sdp->sd_log_blks_reserved =
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sdp->sd_log_commited_buf =
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sdp->sd_log_num_hdrs =
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sdp->sd_log_commited_revoke = 0;
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gfs2_log_lock(sdp);
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if (!list_empty(&ai->ai_ail1_list)) {
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list_add(&ai->ai_list, &sdp->sd_ail1_list);
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ai = NULL;
|
|
}
|
|
gfs2_log_unlock(sdp);
|
|
|
|
sdp->sd_vfs->s_dirt = 0;
|
|
up_write(&sdp->sd_log_flush_lock);
|
|
|
|
kfree(ai);
|
|
}
|
|
|
|
static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
|
|
{
|
|
unsigned int reserved = 0;
|
|
unsigned int old;
|
|
|
|
gfs2_log_lock(sdp);
|
|
|
|
sdp->sd_log_commited_buf += tr->tr_num_buf_new - tr->tr_num_buf_rm;
|
|
gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_buf) >= 0);
|
|
sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm;
|
|
gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_revoke) >= 0);
|
|
|
|
if (sdp->sd_log_commited_buf)
|
|
reserved += sdp->sd_log_commited_buf;
|
|
if (sdp->sd_log_commited_revoke)
|
|
reserved += gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke,
|
|
sizeof(u64));
|
|
if (reserved)
|
|
reserved++;
|
|
|
|
old = sdp->sd_log_blks_free;
|
|
sdp->sd_log_blks_free += tr->tr_reserved -
|
|
(reserved - sdp->sd_log_blks_reserved);
|
|
|
|
gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free >= old);
|
|
gfs2_assert_withdraw(sdp,
|
|
sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks +
|
|
sdp->sd_log_num_hdrs);
|
|
|
|
sdp->sd_log_blks_reserved = reserved;
|
|
|
|
gfs2_log_unlock(sdp);
|
|
}
|
|
|
|
/**
|
|
* gfs2_log_commit - Commit a transaction to the log
|
|
* @sdp: the filesystem
|
|
* @tr: the transaction
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
|
|
{
|
|
log_refund(sdp, tr);
|
|
lops_incore_commit(sdp, tr);
|
|
|
|
sdp->sd_vfs->s_dirt = 1;
|
|
up_read(&sdp->sd_log_flush_lock);
|
|
|
|
gfs2_log_lock(sdp);
|
|
if (sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks)) {
|
|
gfs2_log_unlock(sdp);
|
|
gfs2_log_flush(sdp, NULL);
|
|
} else
|
|
gfs2_log_unlock(sdp);
|
|
}
|
|
|
|
/**
|
|
* gfs2_log_shutdown - write a shutdown header into a journal
|
|
* @sdp: the filesystem
|
|
*
|
|
*/
|
|
|
|
void gfs2_log_shutdown(struct gfs2_sbd *sdp)
|
|
{
|
|
down_write(&sdp->sd_log_flush_lock);
|
|
|
|
gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved);
|
|
gfs2_assert_withdraw(sdp, !sdp->sd_log_num_gl);
|
|
gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf);
|
|
gfs2_assert_withdraw(sdp, !sdp->sd_log_num_jdata);
|
|
gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
|
|
gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg);
|
|
gfs2_assert_withdraw(sdp, !sdp->sd_log_num_databuf);
|
|
gfs2_assert_withdraw(sdp, !sdp->sd_log_num_hdrs);
|
|
gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list));
|
|
|
|
sdp->sd_log_flush_head = sdp->sd_log_head;
|
|
sdp->sd_log_flush_wrapped = 0;
|
|
|
|
log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT, 0);
|
|
|
|
/* printk(KERN_INFO "sd_log_blks_free %u, sd_jdesc->jd_blocks %u\n", sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); */
|
|
gfs2_assert_warn(sdp, sdp->sd_log_blks_free == sdp->sd_jdesc->jd_blocks);
|
|
gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail);
|
|
gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list));
|
|
|
|
sdp->sd_log_head = sdp->sd_log_flush_head;
|
|
sdp->sd_log_tail = sdp->sd_log_head;
|
|
|
|
up_write(&sdp->sd_log_flush_lock);
|
|
}
|
|
|