store_swapin.c
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上传日期:2007-01-04
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- /*
- * $Id: store_swapin.c,v 1.17 1999/01/21 21:10:38 wessels Exp $
- *
- * DEBUG: section 20 Storage Manager Swapin Functions
- * 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"
- typedef struct swapin_ctrl_t {
- StoreEntry *e;
- char *path;
- SIH *callback;
- void *callback_data;
- store_client *sc;
- } swapin_ctrl_t;
- /* start swapping in */
- /* callback_data will become the tag on which the stat/open can be aborted */
- void
- storeSwapInStart(StoreEntry * e, SIH * callback, void *callback_data)
- {
- swapin_ctrl_t *ctrlp;
- assert(e->mem_status == NOT_IN_MEMORY);
- if (!EBIT_TEST(e->flags, ENTRY_VALIDATED)) {
- /* We're still reloading and haven't validated this entry yet */
- callback(-1, callback_data);
- return;
- }
- debug(20, 3) ("storeSwapInStart: called for %08X %s n",
- e->swap_file_number, storeKeyText(e->key));
- assert(e->swap_status == SWAPOUT_WRITING || e->swap_status == SWAPOUT_DONE);
- assert(e->swap_file_number >= 0);
- assert(e->mem_obj != NULL);
- ctrlp = xmalloc(sizeof(swapin_ctrl_t));
- ctrlp->e = e;
- ctrlp->callback = callback;
- ctrlp->callback_data = callback_data;
- if (EBIT_TEST(e->flags, ENTRY_VALIDATED))
- storeSwapInValidateComplete(ctrlp, 0, 0);
- else
- storeValidate(e, storeSwapInValidateComplete, ctrlp, callback_data);
- }
- void
- storeSwapInValidateComplete(void *data, int retcode, int errcode)
- {
- swapin_ctrl_t *ctrlp = (swapin_ctrl_t *) data;
- StoreEntry *e;
- if (retcode == -2 && errcode == -2) {
- xfree(ctrlp);
- return;
- }
- e = ctrlp->e;
- assert(e->mem_status == NOT_IN_MEMORY);
- if (!EBIT_TEST(e->flags, ENTRY_VALIDATED)) {
- /* Invoke a store abort that should free the memory object */
- (ctrlp->callback) (-1, ctrlp->callback_data);
- xfree(ctrlp);
- return;
- }
- ctrlp->path = xstrdup(storeSwapFullPath(e->swap_file_number, NULL));
- debug(20, 3) ("storeSwapInValidateComplete: Opening %sn", ctrlp->path);
- store_open_disk_fd++;
- file_open(ctrlp->path,
- O_RDONLY,
- storeSwapInFileOpened,
- ctrlp,
- ctrlp->callback_data);
- }
- void
- storeSwapInFileOpened(void *data, int fd, int errcode)
- {
- swapin_ctrl_t *ctrlp = data;
- StoreEntry *e = ctrlp->e;
- MemObject *mem = e->mem_obj;
- struct stat sb;
- if (fd == -2 && errcode == -2) {
- xfree(ctrlp->path);
- xfree(ctrlp);
- store_open_disk_fd--;
- return;
- }
- assert(mem != NULL);
- assert(e->mem_status == NOT_IN_MEMORY);
- assert(e->swap_status == SWAPOUT_WRITING || e->swap_status == SWAPOUT_DONE);
- if (fd < 0) {
- debug(20, 3) ("storeSwapInFileOpened: Failedn"
- "tFile:t'%s'nt URL:t'%s'n",
- ctrlp->path, storeUrl(e));
- storeEntryDump(e, 3);
- store_open_disk_fd--;
- } else if (e->swap_status != SWAPOUT_DONE) {
- (void) 0;
- } else if (fstat(fd, &sb) < 0) {
- debug(20, 1) ("storeSwapInFileOpened: fstat() FD %d: %sn", fd, xstrerror());
- file_close(fd);
- store_open_disk_fd--;
- fd = -1;
- } else if (sb.st_size == 0 || sb.st_size != e->swap_file_sz) {
- debug(20, 1) ("storeSwapInFileOpened: %s: Size mismatch: %d(fstat) != %d(object)n", ctrlp->path, (int) sb.st_size, e->swap_file_sz);
- file_close(fd);
- store_open_disk_fd--;
- fd = -1;
- }
- if (fd < 0) {
- storeReleaseRequest(e);
- } else {
- debug(20, 5) ("storeSwapInFileOpened: initialized '%s' for '%s'n",
- ctrlp->path, storeUrl(e));
- }
- (ctrlp->callback) (fd, ctrlp->callback_data);
- xfree(ctrlp->path);
- xfree(ctrlp);
- }