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/*
* $Id: store_rebuild.c,v 1.80.2.2 2008/10/06 21:25:45 hno Exp $
*
* DEBUG: section 20 Store Rebuild Routines
* AUTHOR: Duane Wessels
*
* SQUID Web Proxy Cache http://www.squid-cache.org/
* ----------------------------------------------------------
*
* Squid is the result of efforts by numerous individuals from
* the Internet community; see the CONTRIBUTORS file for full
* details. Many organizations have provided support for Squid's
* development; see the SPONSORS file for full details. Squid is
* Copyrighted (C) 2001 by the Regents of the University of
* California; see the COPYRIGHT file for full details. Squid
* incorporates software developed and/or copyrighted by other
* sources; see the CREDITS file for full details.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
*
*/

#include "squid.h"

static struct _store_rebuild_data counts;
static struct timeval rebuild_start;
static void storeCleanup(void *);

typedef struct {
    /* total number of "swap.state" entries that will be read */
    int total;
    /* number of entries read so far */
    int scanned;
} store_rebuild_progress;

static store_rebuild_progress *RebuildProgress = NULL;

static int
storeCleanupDoubleCheck(StoreEntry * e)
{
    SwapDir *SD = &Config.cacheSwap.swapDirs[e->swap_dirn];
    if (SD->dblcheck)
return (SD->dblcheck(SD, e));
    return 0;
}

static void
storeCleanup(void *datanotused)
{
    static int bucketnum = -1;
    static int validnum = 0;
    static int store_errors = 0;
    int validnum_start;
    StoreEntry *e;
    hash_link *link_ptr = NULL;
    hash_link *link_next = NULL;
    int limit = opt_foreground_rebuild ? 1 << 30 : 500;
    validnum_start = validnum;

    while (validnum - validnum_start < limit) {
if (++bucketnum >= store_hash_buckets) {
debug(20, 1) (" Completed Validation Procedure\n");
debug(20, 1) (" Validated %d Entries\n", validnum);
debug(20, 1) (" store_swap_size = %dk\n", store_swap_size);
store_dirs_rebuilding--;
assert(0 == store_dirs_rebuilding);
if (opt_store_doublecheck)
assert(store_errors == 0);
if (store_digest)
storeDigestNoteStoreReady();
return;
}
link_next = hash_get_bucket(store_table, bucketnum);
while (NULL != (link_ptr = link_next)) {
link_next = link_ptr->next;
e = (StoreEntry *) link_ptr;
if (EBIT_TEST(e->flags, ENTRY_VALIDATED))
continue;
/*
* Calling storeRelease() has no effect because we're
* still in 'store_rebuilding' state
*/
if (e->swap_filen < 0)
continue;
if (opt_store_doublecheck)
if (storeCleanupDoubleCheck(e))
store_errors++;
EBIT_SET(e->flags, ENTRY_VALIDATED);
/*
* Only set the file bit if we know its a valid entry
* otherwise, set it in the validation procedure
*/
storeDirUpdateSwapSize(&Config.cacheSwap.swapDirs[e->swap_dirn], e->swap_file_sz, 1);
/* Get rid of private objects. Not useful */
if (EBIT_TEST(e->flags, KEY_PRIVATE))
storeRelease(e);
if ((++validnum & 0x3FFFF) == 0)
debug(20, 1) (" %7d Entries Validated so far.\n", validnum);
}
    }
    eventAdd("storeCleanup", storeCleanup, NULL, 0.0, 1);
}

/* meta data recreated from disk image in swap directory */
void
storeRebuildComplete(struct _store_rebuild_data *dc)
{
    double dt;
    counts.objcount += dc->objcount;
    counts.expcount += dc->expcount;
    counts.scancount += dc->scancount;
    counts.clashcount += dc->clashcount;
    counts.dupcount += dc->dupcount;
    counts.cancelcount += dc->cancelcount;
    counts.invalid += dc->invalid;
    counts.badflags += dc->badflags;
    counts.bad_log_op += dc->bad_log_op;
    counts.zero_object_sz += dc->zero_object_sz;
    /*
* When store_dirs_rebuilding == 1, it means we are done reading
* or scanning all cache_dirs. Now report the stats and start
* the validation (storeCleanup()) thread.
*/
    if (store_dirs_rebuilding > 1)
return;
    dt = tvSubDsec(rebuild_start, current_time);
    debug(20, 1) ("Finished rebuilding storage from disk.\n");
    debug(20, 1) (" %7d Entries scanned\n", counts.scancount);
    debug(20, 1) (" %7d Invalid entries.\n", counts.invalid);
    debug(20, 1) (" %7d With invalid flags.\n", counts.badflags);
    debug(20, 1) (" %7d Objects loaded.\n", counts.objcount);
    debug(20, 1) (" %7d Objects expired.\n", counts.expcount);
    debug(20, 1) (" %7d Objects cancelled.\n", counts.cancelcount);
    debug(20, 1) (" %7d Duplicate URLs purged.\n", counts.dupcount);
    debug(20, 1) (" %7d Swapfile clashes avoided.\n", counts.clashcount);
    debug(20, 1) (" Took %3.1f seconds (%6.1f objects/sec).\n", dt,
(double) counts.objcount / (dt > 0.0 ? dt : 1.0));
    debug(20, 1) ("Beginning Validation Procedure\n");
    eventAdd("storeCleanup", storeCleanup, NULL, 0.0, 1);
    safe_free(RebuildProgress);
}

/*
* this is ugly. We don't actually start any rebuild threads here,
* but only initialize counters, etc. The rebuild threads are
* actually started by the filesystem "fooDirInit" function.
*/
void
storeRebuildStart(void)
{
    memset(&counts, '\0', sizeof(counts));
    rebuild_start = current_time;
    /*
* Note: store_dirs_rebuilding is initialized to 1 in globals.c.
* This prevents us from trying to write clean logs until we
* finished rebuilding for sure. The corresponding decrement
* occurs in storeCleanup(), when it is finished.
*/
    RebuildProgress = xcalloc(Config.cacheSwap.n_configured,
sizeof(store_rebuild_progress));
}

/*
* A fs-specific rebuild procedure periodically reports its
* progress.
*/
void
storeRebuildProgress(int sd_index, int total, int sofar)
{
    static time_t last_report = 0;
    double n = 0.0;
    double d = 0.0;
    if (sd_index < 0)
return;
    if (sd_index >= Config.cacheSwap.n_configured)
return;
    if (NULL == RebuildProgress)
return;
    RebuildProgress[sd_index].total = total;
    RebuildProgress[sd_index].scanned = sofar;
    if (squid_curtime - last_report < 15)
return;
    for (sd_index = 0; sd_index < Config.cacheSwap.n_configured; sd_index++) {
n += (double) RebuildProgress[sd_index].scanned;
d += (double) RebuildProgress[sd_index].total;
    }
    debug(20, 1) ("Store rebuilding is %4.1f%% complete\n", 100.0 * n / d);
    last_report = squid_curtime;
}
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