/*
- * $Id: cnid_add.c,v 1.11 2001-10-18 02:28:56 jmarcus Exp $
+ * $Id: cnid_add.c,v 1.16 2001-12-03 15:46:30 jmarcus Exp $
*
* Copyright (c) 1999. Adrian Sun (asun@zoology.washington.edu)
* All Rights Reserved. See COPYRIGHT.
#endif /* HAVE_FCNTL_H */
#include <errno.h>
#include <syslog.h>
+#ifdef HAVE_TIME_H
+#include <time.h>
+#endif /* HAVE_TIME_H */
+#ifdef HAVE_CMA_H
+#include <cma.h>
+#endif /* HAVE_CMA_H */
#include <db.h>
#include <netatalk/endian.h>
#include "cnid_private.h"
+#define MAX_ABORTS 255
+
/* add an entry to the CNID databases. we do this as a transaction
* to prevent messiness. */
-static int add_cnid(CNID_private *db, DB_TXN *ptid, DBT *key, DBT *data)
-{
- DBT altkey, altdata;
- DB_TXN *tid;
- /* We create rc here because using errno is bad. Why? Well, if you
- * use errno once, then call another function which resets it, you're
- * screwed. */
- int rc = 0;
-
- memset(&altkey, 0, sizeof(altkey));
- memset(&altdata, 0, sizeof(altdata));
-
+static int add_cnid(CNID_private *db, DB_TXN *ptid, DBT *key, DBT *data) {
+ DBT altkey, altdata;
+ DB_TXN *tid;
+ /* We create rc here because using errno is bad. Why? Well, if you
+ * use errno once, then call another function which resets it, you're
+ * screwed. */
+ int rc, ret, aborts = 0;
+
+ memset(&altkey, 0, sizeof(altkey));
+ memset(&altdata, 0, sizeof(altdata));
+
+ if (0) {
retry:
- if ((rc = txn_begin(db->dbenv, ptid, &tid,0))) {
- return rc;
- }
+ if ((rc = txn_abort(tid)) != 0) {
+ return rc;
+ }
+ if (++aborts > MAX_ABORTS) {
+ return DB_LOCK_DEADLOCK;
+ }
+ }
- /* main database */
- if ((rc = db->db_cnid->put(db->db_cnid, tid,
- key, data, DB_NOOVERWRITE))) {
- txn_abort(tid);
- if (rc == DB_LOCK_DEADLOCK)
- goto retry;
+ if ((rc = txn_begin(db->dbenv, ptid, &tid, 0)) != 0) {
+ return rc;
+ }
- return rc;
- }
+ /* main database */
+ if ((rc = db->db_cnid->put(db->db_cnid, tid, key, data, DB_NOOVERWRITE))) {
+ if (rc == DB_LOCK_DEADLOCK) {
+ goto retry;
+ }
- /* did/name database */
- altkey.data = (char *) data->data + CNID_DEVINO_LEN;
- altkey.size = data->size - CNID_DEVINO_LEN;
- if ((rc = db->db_didname->put(db->db_didname, tid,
- &altkey, &altdata, 0))) {
- txn_abort(tid);
- if (rc == DB_LOCK_DEADLOCK)
- goto retry;
+ goto abort;
+ }
- return rc;
- }
-
- /* dev/ino database */
- altkey.data = data->data;
- altkey.size = CNID_DEVINO_LEN;
- altdata.data = key->data;
- altdata.size = key->size;
- if ((rc = db->db_devino->put(db->db_devino, tid,
- &altkey, &altdata, 0))) {
- txn_abort(tid);
- if (rc == DB_LOCK_DEADLOCK)
- goto retry;
- return rc;
- }
+ /* dev/ino database */
+ altkey.data = data->data;
+ altkey.size = CNID_DEVINO_LEN;
+ altdata.data = key->data;
+ altdata.size = key->size;
+ if ((rc = db->db_devino->put(db->db_devino, tid, &altkey, &altdata, 0))) {
+ if (rc == DB_LOCK_DEADLOCK) {
+ goto retry;
+ }
+ goto abort;
+ }
+
+
+ /* did/name database */
+ altkey.data = (char *) data->data + CNID_DEVINO_LEN;
+ altkey.size = data->size - CNID_DEVINO_LEN;
+ if ((rc = db->db_didname->put(db->db_didname, tid, &altkey, &altdata, 0))) {
+ if (rc == DB_LOCK_DEADLOCK) {
+ goto retry;
+ }
+
+ goto abort;
+ }
+
+ if ((rc = txn_commit(tid, 0)) != 0) {
+ syslog(LOG_ERR, "add_cnid: Failed to commit transaction: %s",
+ db_strerror(rc));
+ return rc;
+ }
+ return 0;
+
+abort:
+ if ((ret = txn_abort(tid)) != 0) {
+ return ret;
+ }
+ return rc;
- return txn_commit(tid, 0);
}
-/* 0 is not a valid cnid. this will do a cnid_lookup beforehand and
- return that cnid if it exists. */
cnid_t cnid_add(void *CNID, const struct stat *st,
- const cnid_t did, const char *name, const int len,
- cnid_t hint)
+ const cnid_t did, const char *name, const int len,
+ cnid_t hint)
{
- CNID_private *db;
- DBT key, data;
- DBT rootinfo_key, rootinfo_data;
- DB_TXN *tid;
- cnid_t id, save;
- int rc = 0;
+ CNID_private *db;
+ DBT key, data, rootinfo_key, rootinfo_data;
+ DB_TXN *tid;
+ struct timeval t;
+ cnid_t id, save;
+ int rc;
+
+ if (!(db = CNID) || !st || !name) {
+ return 0;
+ }
- int debug = 0;
+ /* Do a lookup. */
+ id = cnid_lookup(db, st, did, name, len);
+ /* ... Return id if it is valid, or if Rootinfo is read-only. */
+ if (id || (db->flags & CNIDFLAG_DB_RO)) {
+#ifdef DEBUG
+ syslog(LOG_INFO, "cnid_add: Looked up did %u, name %s as %u",
+ ntohl(did), name, ntohl(id));
+#endif
+ return id;
+ }
+ /* Initialize our DBT data structures. */
+ memset(&key, 0, sizeof(key));
+ memset(&data, 0, sizeof(data));
- if (!(db = CNID) || !st || !name) {
- return 0;
- }
-
- /* do a lookup... */
- id = cnid_lookup(db, st, did, name, len);
- /* ...return id if it is valid or if RootInfo is read-only. */
- if (id || (db->flags & CNIDFLAG_DB_RO)) {
- if (debug)
- syslog(LOG_ERR, "cnid_add: looked up did %u, name %s as %u", ntohl(did), name, ntohl(id));
- return id;
- }
-
- /* initialize everything */
- memset(&key, 0, sizeof(key));
- memset(&data, 0, sizeof(data));
-
- /* just set hint, and the key will change. */
- key.data = &hint;
- key.size = sizeof(hint);
-
- if ((data.data =
- make_cnid_data(st, did, name, len)) == NULL) {
- syslog(LOG_ERR, "cnid_add: path name too long.");
- goto cleanup_err;
- }
- data.size = CNID_HEADER_LEN + len + 1;
-
- /* start off with the hint. it should be in network byte order.
- * we need to make sure that somebody doesn't add in restricted
- * cnid's to the database. */
- if (ntohl(hint) >= CNID_START) {
- /* if the key doesn't exist, add it in. don't fiddle with nextID. */
- rc = add_cnid(db, NULL, &key, &data);
- switch (rc) {
- case DB_KEYEXIST: /* need to use RootInfo after all. */
- break;
- default:
- syslog(LOG_ERR, "cnid_add: unable to add CNID %u (%d)", ntohl(hint), rc);
- goto cleanup_err;
+ /* Just tickle hint, and the key will change (gotta love pointers). */
+ key.data = &hint;
+ key.size = sizeof(hint);
+
+ if ((data.data = make_cnid_data(st, did, name, len)) == NULL) {
+ syslog(LOG_ERR, "cnid_add: Path name is too long");
+ goto cleanup_err;
+ }
+
+ data.size = CNID_HEADER_LEN + len + 1;
+
+ /* Start off with the hint. It should be in network byte order.
+ * We need to make sure that somebody doesn't add in restricted
+ * cnid's to the database. */
+ if (ntohl(hint) >= CNID_START) {
+ /* If the key doesn't exist, add it in. Don't fiddle with nextID. */
+ rc = add_cnid(db, NULL, &key, &data);
+ switch (rc) {
+ case DB_KEYEXIST: /* Need to use RootInfo after all. */
+ break;
+ default:
+ syslog(LOG_ERR, "cnid_add: Unable to add CNID %u: %s",
+ ntohl(hint), db_strerror(rc));
+ goto cleanup_err;
+ case 0:
+#ifdef DEBUG
+ syslog(LOG_INFO, "cnid_add: Used hint for did %u, name %s as %u",
+ ntohl(did), name, ntohl(hint));
+#endif
+ return hint;
+ }
+ }
+
+ /* We need to create a random sleep interval to prevent deadlocks. */
+ (void)srand(getpid() ^ time(NULL));
+ t.tv_sec = 0;
+
+ memset(&rootinfo_key, 0, sizeof(rootinfo_key));
+ memset(&rootinfo_data, 0, sizeof(rootinfo_data));
+ rootinfo_key.data = ROOTINFO_KEY;
+ rootinfo_key.size = ROOTINFO_KEYLEN;
+
+ /* Get the key. */
+retry_get:
+ switch (rc = db->db_didname->get(db->db_didname, NULL, &rootinfo_key,
+ &rootinfo_data, 0)) {
+ case DB_LOCK_DEADLOCK:
+ if ((rc = txn_abort(tid)) != 0) {
+ syslog(LOG_ERR, "cnid_add: txn_abort: %s", db_strerror(rc));
+ goto cleanup_err;
+ }
+ goto retry_get;
case 0:
- if (debug)
- syslog(LOG_ERR, "cnid_add: used hint for did %u, name %s as %u", ntohl(did), name, ntohl(hint));
- return hint;
- }
- }
-
-
- memset(&rootinfo_key, 0, sizeof(rootinfo_key));
- memset(&rootinfo_data, 0, sizeof(rootinfo_data));
-
- /* just set hint, and the key will change. */
- rootinfo_key.data = ROOTINFO_KEY;
- rootinfo_key.size = ROOTINFO_KEYLEN;
-
- /* Get the key. */
- switch (rc = db->db_didname->get(db->db_didname, NULL, &rootinfo_key, &rootinfo_data, 0)) {
- case DB_LOCK_DEADLOCK:
- goto retry;
- case 0:
- memcpy (&hint, rootinfo_data.data, sizeof(hint));
- if (debug)
- syslog(LOG_ERR, "cnid_add: found rootinfo for did %u, name %s as %u", ntohl(did), name, ntohl(hint));
- break;
- case DB_NOTFOUND:
- hint = htonl(CNID_START);
- if (debug)
- syslog(LOG_ERR, "cnid_add: using CNID_START for did %u, name %s as %u", ntohl(did), name, ntohl(hint));
- break;
- default:
- syslog(LOG_ERR, "cnid_add: unable to lookup rootinfo (%d)", rc);
- goto cleanup_err;
- }
-
- /* Abort and retry the modification. */
- if (0) {
-retry: if ((rc = txn_abort(tid)) != 0)
- syslog(LOG_ERR, "cnid_add: txn_abort failed (%d)", rc);
- /* FALLTHROUGH */
- }
-
- /* Begin the transaction. */
- if ((rc = txn_begin(db->dbenv, NULL, &tid, 0)) != 0) {
- syslog(LOG_ERR, "cnid_add: txn_begin failed (%d)", rc);
- goto cleanup_err;
- }
-
-
- /* search for a new id. we keep the first id around to check for
- * wrap-around. NOTE: i do it this way so that we can go back and
- * fill in holes. */
- save = id = ntohl(hint);
- while ((rc = add_cnid(db, tid, &key, &data))) {
- /* don't use any of the special CNIDs */
- if (++id < CNID_START)
- id = CNID_START;
-
- if ((rc != DB_KEYEXIST) || (save == id)) {
- syslog(LOG_ERR, "cnid_add: unable to add CNID %u (%d)", ntohl(hint), rc);
- hint = 0;
- goto cleanup_abort;
- }
- hint = htonl(id);
- }
-
- /* update RootInfo with the next id. */
- rootinfo_data.data = &hint;
- rootinfo_data.size = sizeof(hint);
-
- switch (rc = db->db_didname->put(db->db_didname, tid, &rootinfo_key, &rootinfo_data, 0)) {
- case DB_LOCK_DEADLOCK:
- goto retry;
- case 0:
- break;
- default:
- syslog(LOG_ERR, "cnid_add: unable to update rootinfo (%d)", rc);
- goto cleanup_abort;
- }
+ memcpy(&hint, rootinfo_data.data, sizeof(hint));
+#ifdef DEBUG
+ syslog(LOG_INFO, "cnid_add: Found rootinfo for did %u, name %s as %u", ntohl(did), name, ntohl(hint));
+#endif
+ break;
+ case DB_NOTFOUND:
+ hint = htonl(CNID_START);
+#ifdef DEBUG
+ syslog(LOG_INFO, "cnid_add: Using CNID_START for did %u, name %s",
+ ntohl(did), name);
+#endif
+ break;
+ default:
+ syslog(LOG_ERR, "cnid_add: Unable to lookup rootinfo: %s",
+ db_strerror(rc));
+ goto cleanup_err;
+ }
+
+
+retry:
+ t.tv_usec = rand() % 1000000;
+#ifdef DEBUG
+ syslog(LOG_INFO, "cnid_add: Hitting MAX_ABORTS, sleeping");
+#endif
+ (void)select(0, NULL, NULL, NULL, &t);
+ if ((rc = txn_begin(db->dbenv, NULL, &tid, 0)) != 0) {
+ syslog(LOG_ERR, "cnid_add: Failed to begin transaction: %s",
+ db_strerror(rc));
+ goto cleanup_err;
+ }
+
+ /* Search for a new id. We keep the first id around to check for
+ * wrap-around. NOTE: I do it this way so that we can go back and
+ * fill in holes. */
+ save = id = ntohl(hint);
+ while ((rc = add_cnid(db, tid, &key, &data)) != 0) {
+ /* Don't use any special CNIDs. */
+ if (++id < CNID_START) {
+ id = CNID_START;
+ }
+ if (rc == DB_LOCK_DEADLOCK) {
+ if ((rc = txn_abort(tid)) != 0) {
+ syslog(LOG_ERR, "cnid_add: txn_abort: %s", db_strerror(rc));
+ goto cleanup_err;
+ }
+ goto retry;
+ }
+
+ if ((rc != DB_KEYEXIST) || (save == id)) {
+ syslog(LOG_ERR, "cnid_add: Unable to add CNID %u: %s",
+ ntohl(hint), db_strerror(rc));
+ goto cleanup_abort;
+ }
+ hint = htonl(id);
+ }
+
+ rootinfo_data.data = &hint;
+ rootinfo_data.size = sizeof(hint);
+ switch (rc = db->db_didname->put(db->db_didname, tid, &rootinfo_key, &rootinfo_data, 0)) {
+ case DB_LOCK_DEADLOCK:
+ if ((rc = txn_abort(tid)) != 0) {
+ syslog(LOG_ERR, "cnid_add: txn_abort: %s", db_strerror(rc));
+ goto cleanup_err;
+ }
+ goto retry;
+ case 0:
+ break;
+ default:
+ syslog(LOG_ERR, "cnid_add: Unable to update rootinfo: %s",
+ db_strerror(rc));
+ goto cleanup_abort;
+ }
cleanup_commit:
- /* The transaction finished, commit it. */
- if ((rc = txn_commit(tid, 0)) != 0) {
- syslog(LOG_ERR, "cnid_add: txn_commit failed (%d)", rc);
- goto cleanup_err;
- }
+ /* The transaction finished, commit it. */
+ if ((rc = txn_commit(tid, 0)) != 0) {
+ syslog(LOG_ERR, "cnid_add: Unable to commit transaction: %s",
+ db_strerror(rc));
+ goto cleanup_err;
+ }
- if (debug)
- syslog(LOG_ERR, "cnid_add: returned cnid for did %u, name %s as %u", ntohl(did), name, ntohl(hint));
- return hint;
+#ifdef DEBUG
+ syslog(LOG_INFO, "cnid_add: Returned CNID for did %u, name %s as %u",
+ ntohl(did), name, ntohl(hint));
+#endif
+ return hint;
cleanup_abort:
- txn_abort(tid);
+ txn_abort(tid);
cleanup_err:
- return 0;
+ return 0;
}
#endif /* CNID_DB */
+
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