X-Git-Url: https://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Ftdb2%2Fopen.c;h=49804acfba427236382eb5e76d9790e05833eea7;hp=c6fd9a090ecf3078bb4135e6b0651403d8379978;hb=c8f6f8c2dea76042f74c02eff048847e62adcca6;hpb=703cea0c78a896c658272af06306218fc0bb23cc
diff --git a/ccan/tdb2/open.c b/ccan/tdb2/open.c
index c6fd9a09..49804acf 100644
--- a/ccan/tdb2/open.c
+++ b/ccan/tdb2/open.c
@@ -1,21 +1,37 @@
+ /*
+ 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
-/* all lock info, to detect double-opens (fcntl file don't nest!) */
-static struct tdb_file *files = NULL;
+/* all tdbs, to detect double-opens (fcntl file don't nest!) */
+static struct tdb_context *tdbs = NULL;
static struct tdb_file *find_file(dev_t device, ino_t ino)
{
- struct tdb_file *i;
+ struct tdb_context *i;
- for (i = files; i; i = i->next) {
- if (i->device == device && i->inode == ino) {
- i->refcnt++;
- break;
+ for (i = tdbs; i; i = i->next) {
+ if (i->file->device == device && i->file->inode == ino) {
+ i->file->refcnt++;
+ return i->file;
}
}
- return i;
+ return NULL;
}
static bool read_all(int fd, void *buf, size_t len)
@@ -174,7 +190,7 @@ static enum TDB_ERROR tdb_new_file(struct tdb_context *tdb)
tdb->file = malloc(sizeof(*tdb->file));
if (!tdb->file)
return tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
- "tdb_open: could alloc tdb_file structure");
+ "tdb_open: cannot alloc tdb_file structure");
tdb->file->num_lockrecs = 0;
tdb->file->lockrecs = NULL;
tdb->file->allrecord_lock.count = 0;
@@ -203,6 +219,12 @@ 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;
@@ -219,16 +241,6 @@ enum TDB_ERROR tdb_set_attribute(struct tdb_context *tdb,
return TDB_SUCCESS;
}
-static uint64_t jenkins_hash(const void *key, size_t length, uint64_t seed,
- void *unused)
-{
- uint64_t ret;
- /* hash64_stable assumes lower bits are more important; they are a
- * slightly better hash. We use the upper bits first, so swap them. */
- ret = hash64_stable((const unsigned char *)key, length, seed);
- return (ret >> 32) | (ret << 32);
-}
-
enum TDB_ERROR tdb_get_attribute(struct tdb_context *tdb,
union tdb_attribute *attr)
{
@@ -247,14 +259,18 @@ 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 +295,22 @@ 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;
@@ -317,29 +336,38 @@ 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));
+ tdb = malloc(sizeof(*tdb) + (name ? strlen(name) + 1 : 0));
if (!tdb) {
/* Can't log this */
errno = ENOMEM;
return NULL;
}
- tdb->name = NULL;
- tdb->direct_access = 0;
+ /* Set name immediately for logging functions. */
+ if (name) {
+ tdb->name = strcpy((char *)(tdb + 1), name);
+ } else {
+ tdb->name = NULL;
+ }
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;
+ tdb->hash_fn = tdb_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);
+ tdb->tdb2.direct_access = 0;
+ tdb->tdb2.transaction = NULL;
+ tdb->tdb2.access = NULL;
while (attr) {
switch (attr->base.attr) {
@@ -350,14 +378,9 @@ 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. */
@@ -369,7 +392,8 @@ 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;
@@ -383,11 +407,17 @@ 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. */
@@ -402,16 +432,6 @@ 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);
@@ -442,14 +462,16 @@ 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;
tdb->file->device = st.st_dev;
tdb->file->inode = st.st_ino;
@@ -458,15 +480,15 @@ 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");
@@ -505,6 +527,12 @@ 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));
@@ -520,27 +548,23 @@ 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->tdb2.io->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);
@@ -560,9 +584,8 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
goto fail;
}
- /* Add to linked list if we're new. */
- if (tdb->file->refcnt == 1)
- files = tdb->file;
+ tdb->next = tdbs;
+ tdbs = tdb;
return tdb;
fail:
@@ -590,7 +613,6 @@ fail_errno:
#ifdef TDB_TRACE
close(tdb->tracefd);
#endif
- free(cast_const(char *, tdb->name));
if (tdb->file) {
tdb_lock_cleanup(tdb);
if (--tdb->file->refcnt == 0) {
@@ -618,10 +640,11 @@ fail_errno:
int tdb_close(struct tdb_context *tdb)
{
int ret = 0;
+ struct tdb_context **i;
tdb_trace(tdb, "tdb_close");
- if (tdb->transaction) {
+ if (tdb->tdb2.transaction) {
tdb_transaction_cancel(tdb);
}
@@ -631,26 +654,23 @@ int tdb_close(struct tdb_context *tdb)
else
tdb_munmap(tdb->file);
}
- free(cast_const(char *, tdb->name));
if (tdb->file) {
- struct tdb_file **i;
-
tdb_lock_cleanup(tdb);
if (--tdb->file->refcnt == 0) {
ret = close(tdb->file->fd);
-
- /* Remove from files list */
- for (i = &files; *i; i = &(*i)->next) {
- if (*i == tdb->file) {
- *i = tdb->file->next;
- break;
- }
- }
free(tdb->file->lockrecs);
free(tdb->file);
}
}
+ /* Remove from tdbs list */
+ for (i = &tdbs; *i; i = &(*i)->next) {
+ if (*i == tdb) {
+ *i = tdb->next;
+ break;
+ }
+ }
+
#ifdef TDB_TRACE
close(tdb->tracefd);
#endif
@@ -658,3 +678,13 @@ int tdb_close(struct tdb_context *tdb)
return ret;
}
+
+void tdb_foreach_(int (*fn)(struct tdb_context *, void *), void *p)
+{
+ struct tdb_context *i;
+
+ for (i = tdbs; i; i = i->next) {
+ if (fn(i, p) != 0)
+ break;
+ }
+}