X-Git-Url: http://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Ftdb2%2Fopen.c;h=277a95f9e8ba7bb72caed6ac434f7ccb798ebc1c;hp=37e20907fedfc1a9f512c449dea8b8e727ebcf9a;hb=937d0babe99dcd315040a9e48430140e63e4a7df;hpb=66ead2bcb732aa53bde5092b34c16d780df779ea
diff --git a/ccan/tdb2/open.c b/ccan/tdb2/open.c
index 37e20907..277a95f9 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 .
+*/
#include "private.h"
#include
#include
@@ -203,6 +220,12 @@ enum TDB_ERROR tdb_set_attribute(struct tdb_context *tdb,
: attr->base.attr == TDB_ATTRIBUTE_SEED
? "TDB_ATTRIBUTE_SEED"
: "TDB_ATTRIBUTE_OPENHOOK");
+ case TDB_ATTRIBUTE_STATS:
+ return tdb->last_error
+ = tdb_logerr(tdb, TDB_ERR_EINVAL,
+ TDB_LOG_USE_ERROR,
+ "tdb_set_attribute:"
+ " cannot set TDB_ATTRIBUTE_STATS");
case TDB_ATTRIBUTE_FLOCK:
tdb->lock_fn = attr->flock.lock;
tdb->unlock_fn = attr->flock.unlock;
@@ -247,14 +270,18 @@ enum TDB_ERROR tdb_get_attribute(struct tdb_context *tdb,
attr->seed.seed = tdb->hash_seed;
break;
case TDB_ATTRIBUTE_OPENHOOK:
- return tdb->last_error
- = tdb_logerr(tdb, TDB_ERR_EINVAL,
- TDB_LOG_USE_ERROR,
- "tdb_get_attribute:"
- " cannot get TDB_ATTRIBUTE_OPENHOOK");
- case TDB_ATTRIBUTE_STATS:
- /* FIXME */
- return TDB_ERR_EINVAL;
+ if (!tdb->openhook)
+ return tdb->last_error = TDB_ERR_NOEXIST;
+ attr->openhook.fn = tdb->openhook;
+ attr->openhook.data = tdb->openhook_data;
+ break;
+ case TDB_ATTRIBUTE_STATS: {
+ size_t size = attr->stats.size;
+ if (size > tdb->stats.size)
+ size = tdb->stats.size;
+ memcpy(&attr->stats, &tdb->stats, size);
+ break;
+ }
case TDB_ATTRIBUTE_FLOCK:
attr->flock.lock = tdb->lock_fn;
attr->flock.unlock = tdb->unlock_fn;
@@ -279,19 +306,22 @@ void tdb_unset_attribute(struct tdb_context *tdb,
case TDB_ATTRIBUTE_LOG:
tdb->log_fn = NULL;
break;
+ case TDB_ATTRIBUTE_OPENHOOK:
+ tdb->openhook = NULL;
+ break;
case TDB_ATTRIBUTE_HASH:
case TDB_ATTRIBUTE_SEED:
- case TDB_ATTRIBUTE_OPENHOOK:
tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_LOG_USE_ERROR,
"tdb_unset_attribute: cannot unset %s after opening",
type == TDB_ATTRIBUTE_HASH
? "TDB_ATTRIBUTE_HASH"
- : type == TDB_ATTRIBUTE_SEED
- ? "TDB_ATTRIBUTE_SEED"
- : "TDB_ATTRIBUTE_OPENHOOK");
+ : "TDB_ATTRIBUTE_SEED");
break;
case TDB_ATTRIBUTE_STATS:
- /* FIXME */
+ tdb_logerr(tdb, TDB_ERR_EINVAL,
+ TDB_LOG_USE_ERROR,
+ "tdb_unset_attribute:"
+ "cannot unset TDB_ATTRIBUTE_STATS");
break;
case TDB_ATTRIBUTE_FLOCK:
tdb->lock_fn = tdb_fcntl_lock;
@@ -317,9 +347,9 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
ssize_t rlen;
struct tdb_header hdr;
struct tdb_attribute_seed *seed = NULL;
- 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) {
@@ -337,13 +367,17 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
tdb->flags = tdb_flags;
tdb->log_fn = NULL;
tdb->transaction = NULL;
- tdb->stats = NULL;
tdb->access = NULL;
+ tdb->open_flags = open_flags;
tdb->last_error = TDB_SUCCESS;
tdb->file = NULL;
+ tdb->openhook = NULL;
tdb->lock_fn = tdb_fcntl_lock;
tdb->unlock_fn = tdb_fcntl_unlock;
tdb->hash_fn = jenkins_hash;
+ memset(&tdb->stats, 0, sizeof(tdb->stats));
+ tdb->stats.base.attr = TDB_ATTRIBUTE_STATS;
+ tdb->stats.size = sizeof(tdb->stats);
tdb_io_init(tdb);
while (attr) {
@@ -355,14 +389,9 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
case TDB_ATTRIBUTE_SEED:
seed = &attr->seed;
break;
- case TDB_ATTRIBUTE_STATS:
- tdb->stats = &attr->stats;
- /* They have stats we don't know about? Tell them. */
- if (tdb->stats->size > sizeof(attr->stats))
- tdb->stats->size = sizeof(attr->stats);
- break;
case TDB_ATTRIBUTE_OPENHOOK:
- openhook = &attr->openhook;
+ tdb->openhook = attr->openhook.fn;
+ tdb->openhook_data = attr->openhook.data;
break;
default:
/* These are set as normal. */
@@ -374,7 +403,8 @@ 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;
@@ -388,11 +418,17 @@ 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. */
@@ -407,16 +443,6 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
if (ecode != TDB_SUCCESS) {
goto fail;
}
- if (name) {
- tdb->name = strdup(name);
- if (!tdb->name) {
- ecode = tdb_logerr(tdb, TDB_ERR_OOM,
- TDB_LOG_ERROR,
- "tdb_open: failed to"
- " allocate name");
- goto fail;
- }
- }
tdb_convert(tdb, &hdr.hash_seed, sizeof(hdr.hash_seed));
tdb->hash_seed = hdr.hash_seed;
tdb_ftable_init(tdb);
@@ -447,12 +473,15 @@ 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;
@@ -463,15 +492,15 @@ 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;
}
/* call their open hook if they gave us one. */
- if (openhook) {
- ecode = openhook->fn(tdb->file->fd, openhook->data);
+ if (tdb->openhook) {
+ ecode = tdb->openhook(tdb->file->fd, tdb->openhook_data);
if (ecode != TDB_SUCCESS) {
tdb_logerr(tdb, ecode, TDB_LOG_ERROR,
"tdb_open: open hook failed");
@@ -510,6 +539,12 @@ 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));
@@ -525,27 +560,23 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
goto fail;
}
- tdb->name = strdup(name);
- if (!tdb->name) {
- ecode = tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
- "tdb_open: failed to allocate name");
- goto fail;
- }
-
/* 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);