X-Git-Url: http://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Ftdb2%2Fopen.c;h=68f707b920ec8cf72bcf66b9788c1abd25bc26c0;hp=1292fcc1ee32ee59431284527706461696096211;hb=b87e14495d5b07e1b247218a72329f10ecb3da7f;hpb=8cca0397ef6f6017b13ce9ab4999bf3d92a2dee5;ds=sidebyside

diff --git a/ccan/tdb2/open.c b/ccan/tdb2/open.c
index 1292fcc1..68f707b9 100644
--- a/ccan/tdb2/open.c
+++ b/ccan/tdb2/open.c
@@ -1,3 +1,20 @@
+ /*
+   Trivial Database 2: opening and closing TDBs
+   Copyright (C) Rusty Russell 2010
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 3 of the License, or (at your option) any later version.
+
+   This library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, see <http://www.gnu.org/licenses/>.
+*/
 #include "private.h"
 #include <ccan/hash/hash.h>
 #include <assert.h>
@@ -333,6 +350,7 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
 	struct tdb_attribute_openhook *openhook = NULL;
 	tdb_bool_err berr;
 	enum TDB_ERROR ecode;
+	int openlock;
 
 	tdb = malloc(sizeof(*tdb) + (name ? strlen(name) + 1 : 0));
 	if (!tdb) {
@@ -351,6 +369,7 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
 	tdb->log_fn = NULL;
 	tdb->transaction = NULL;
 	tdb->access = NULL;
+	tdb->open_flags = open_flags;
 	tdb->last_error = TDB_SUCCESS;
 	tdb->file = NULL;
 	tdb->lock_fn = tdb_fcntl_lock;
@@ -383,7 +402,8 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
 	}
 
 	if (tdb_flags & ~(TDB_INTERNAL | TDB_NOLOCK | TDB_NOMMAP | TDB_CONVERT
-			  | TDB_NOSYNC | TDB_SEQNUM)) {
+			  | TDB_NOSYNC | TDB_SEQNUM | TDB_ALLOW_NESTING
+			  | TDB_RDONLY)) {
 		ecode = tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_LOG_USE_ERROR,
 				   "tdb_open: unknown flags %u", tdb_flags);
 		goto fail;
@@ -397,11 +417,17 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
 	}
 
 	if ((open_flags & O_ACCMODE) == O_RDONLY) {
-		tdb->read_only = true;
-		tdb->mmap_flags = PROT_READ;
+		openlock = F_RDLCK;
+		tdb->flags |= TDB_RDONLY;
 	} else {
-		tdb->read_only = false;
-		tdb->mmap_flags = PROT_READ | PROT_WRITE;
+		if (tdb_flags & TDB_RDONLY) {
+			ecode = tdb_logerr(tdb, TDB_ERR_EINVAL,
+					   TDB_LOG_USE_ERROR,
+					   "tdb_open: can't use TDB_RDONLY"
+					   " without O_RDONLY");
+			goto fail;
+		}
+		openlock = F_WRLCK;
 	}
 
 	/* internal databases don't need any of the rest. */
@@ -446,12 +472,15 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
 			tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
 				   "tdb_open: could not stat open %s: %s",
 				   name, strerror(errno));
+			close(fd);
 			goto fail_errno;
 		}
 
 		ecode = tdb_new_file(tdb);
-		if (ecode != TDB_SUCCESS)
+		if (ecode != TDB_SUCCESS) {
+			close(fd);
 			goto fail;
+		}
 
 		tdb->file->next = files;
 		tdb->file->fd = fd;
@@ -462,7 +491,7 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
  	}
 
 	/* ensure there is only one process initialising at once */
-	ecode = tdb_lock_open(tdb, TDB_LOCK_WAIT|TDB_LOCK_NOCHECK);
+	ecode = tdb_lock_open(tdb, openlock, TDB_LOCK_WAIT|TDB_LOCK_NOCHECK);
 	if (ecode != TDB_SUCCESS) {
 		saved_errno = errno;
 		goto fail_errno;
@@ -509,6 +538,12 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
 					   name, (long long)hdr.version);
 			goto fail;
 		}
+	} else if (tdb->flags & TDB_CONVERT) {
+		ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
+				   "tdb_open:"
+				   " %s does not need TDB_CONVERT",
+				   name);
+		goto fail;
 	}
 
 	tdb_convert(tdb, &hdr, sizeof(hdr));
@@ -527,17 +562,20 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
 	/* Clear any features we don't understand. */
  	if ((open_flags & O_ACCMODE) != O_RDONLY) {
 		hdr.features_used &= TDB_FEATURE_MASK;
-		if (tdb_write_convert(tdb, offsetof(struct tdb_header,
-						    features_used),
-				      &hdr.features_used,
-				      sizeof(hdr.features_used)) == -1)
+		ecode = tdb_write_convert(tdb, offsetof(struct tdb_header,
+							features_used),
+					  &hdr.features_used,
+					  sizeof(hdr.features_used));
+		if (ecode != TDB_SUCCESS)
 			goto fail;
 	}
 
-	tdb_unlock_open(tdb);
+	tdb_unlock_open(tdb, openlock);
 
 	/* This make sure we have current map_size and mmap. */
-	tdb->methods->oob(tdb, tdb->file->map_size + 1, true);
+	ecode = tdb->methods->oob(tdb, tdb->file->map_size + 1, true);
+	if (unlikely(ecode != TDB_SUCCESS))
+		goto fail;
 
 	/* Now it's fully formed, recover if necessary. */
 	berr = tdb_needs_recovery(tdb);