store_clean.c
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上传日期:2007-01-04
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文件大小:4k
- /*
- * $Id: store_clean.c,v 1.48 1999/01/12 23:38:38 wessels Exp $
- *
- * DEBUG: section 36 Cache Directory Cleanup
- * AUTHOR: Duane Wessels
- *
- * SQUID Internet Object Cache http://squid.nlanr.net/Squid/
- * ----------------------------------------------------------
- *
- * Squid is the result of efforts by numerous individuals from the
- * Internet community. Development is led by Duane Wessels of the
- * National Laboratory for Applied Network Research and funded by the
- * National Science Foundation. Squid is Copyrighted (C) 1998 by
- * Duane Wessels and the University of California San Diego. Please
- * see the COPYRIGHT file for full details. Squid incorporates
- * software developed and/or copyrighted by other sources. Please 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 QS rev_int_sort;
- static int
- rev_int_sort(const void *A, const void *B)
- {
- const int *i1 = A;
- const int *i2 = B;
- return *i2 - *i1;
- }
- void
- storeDirClean(void *datanotused)
- {
- static int swap_index = 0;
- DIR *dp = NULL;
- struct dirent *de = NULL;
- LOCAL_ARRAY(char, p1, MAXPATHLEN + 1);
- LOCAL_ARRAY(char, p2, MAXPATHLEN + 1);
- #if USE_TRUNCATE_NOT_UNLINK
- struct stat sb;
- #endif
- int files[20];
- int swapfileno;
- int fn; /* same as swapfileno, but with dirn bits set */
- int n = 0;
- int k = 0;
- int N0, N1, N2;
- int D0, D1, D2;
- eventAdd("storeDirClean", storeDirClean, NULL, 15.0, 1);
- if (store_rebuilding)
- return;
- N0 = Config.cacheSwap.n_configured;
- D0 = swap_index % N0;
- N1 = Config.cacheSwap.swapDirs[D0].l1;
- D1 = (swap_index / N0) % N1;
- N2 = Config.cacheSwap.swapDirs[D0].l2;
- D2 = ((swap_index / N0) / N1) % N2;
- snprintf(p1, SQUID_MAXPATHLEN, "%s/%02X/%02X",
- Config.cacheSwap.swapDirs[D0].path, D1, D2);
- debug(36, 3) ("storeDirClean: Cleaning directory %sn", p1);
- dp = opendir(p1);
- if (dp == NULL) {
- swap_index++;
- if (errno == ENOENT) {
- debug(36, 0) ("storeDirClean: WARNING: Creating %sn", p1);
- if (mkdir(p1, 0777) == 0)
- return;
- }
- debug(50, 0) ("storeDirClean: %s: %sn", p1, xstrerror());
- safeunlink(p1, 1);
- return;
- }
- while ((de = readdir(dp)) != NULL && k < 20) {
- if (sscanf(de->d_name, "%X", &swapfileno) != 1)
- continue;
- fn = storeDirProperFileno(D0, swapfileno);
- if (storeDirValidFileno(fn))
- if (storeDirMapBitTest(fn))
- if (storeFilenoBelongsHere(fn, D0, D1, D2))
- continue;
- #if USE_TRUNCATE_NOT_UNLINK
- if (!stat(de->d_name, &sb))
- if (sb.st_size == 0)
- continue;
- #endif
- files[k++] = swapfileno;
- }
- closedir(dp);
- swap_index++;
- if (k == 0)
- return;
- qsort(files, k, sizeof(int), rev_int_sort);
- if (k > 10)
- k = 10;
- for (n = 0; n < k; n++) {
- debug(36, 3) ("storeDirClean: Cleaning file %08Xn", files[n]);
- snprintf(p2, MAXPATHLEN + 1, "%s/%08X", p1, files[n]);
- #if USE_TRUNCATE_NOT_UNLINK
- truncate(p2, 0);
- #else
- safeunlink(p2, 0);
- #endif
- Counter.swap_files_cleaned++;
- }
- debug(36, 3) ("Cleaned %d unused files from %sn", k, p1);
- }