X-Git-Url: http://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Ftdb2%2Ftdb.c;h=a7aa4572382b0f8b10ef03c4adc08599fd7e7293;hp=8bae9fc298516738f3e896aa4c31edfa7350f893;hb=98c754ffe65bc335f66161d6cc8705d4ea2710ec;hpb=d95645d52cea0c68cddfd72d21246394596d87e1
diff --git a/ccan/tdb2/tdb.c b/ccan/tdb2/tdb.c
index 8bae9fc2..a7aa4572 100644
--- a/ccan/tdb2/tdb.c
+++ b/ccan/tdb2/tdb.c
@@ -1,431 +1,135 @@
+ /*
+ Trivial Database 2: fetch, store and misc routines.
+ 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
-#include
-#include
-
-/* The null return. */
-struct tdb_data tdb_null = { .dptr = NULL, .dsize = 0 };
-
-/* all contexts, to ensure no double-opens (fcntl locks don't nest!) */
-static struct tdb_context *tdbs = NULL;
-
-PRINTF_FMT(4, 5) static void
-null_log_fn(struct tdb_context *tdb,
- enum tdb_debug_level level, void *priv,
- const char *fmt, ...)
-{
-}
-
-static bool tdb_already_open(dev_t device, ino_t ino)
-{
- struct tdb_context *i;
-
- for (i = tdbs; i; i = i->next) {
- if (i->device == device && i->inode == ino) {
- return true;
- }
- }
-
- return false;
-}
-
-static uint64_t random_number(struct tdb_context *tdb)
-{
- int fd;
- uint64_t ret = 0;
- struct timeval now;
-
- fd = open("/dev/urandom", O_RDONLY);
- if (fd >= 0) {
- if (tdb_read_all(fd, &ret, sizeof(ret))) {
- tdb->log(tdb, TDB_DEBUG_TRACE, tdb->log_priv,
- "tdb_open: random from /dev/urandom\n");
- close(fd);
- return ret;
- }
- close(fd);
- }
- /* FIXME: Untested! Based on Wikipedia protocol description! */
- fd = open("/dev/egd-pool", O_RDWR);
- if (fd >= 0) {
- /* Command is 1, next byte is size we want to read. */
- char cmd[2] = { 1, sizeof(uint64_t) };
- if (write(fd, cmd, sizeof(cmd)) == sizeof(cmd)) {
- char reply[1 + sizeof(uint64_t)];
- int r = read(fd, reply, sizeof(reply));
- if (r > 1) {
- tdb->log(tdb, TDB_DEBUG_TRACE, tdb->log_priv,
- "tdb_open: %u random bytes from"
- " /dev/egd-pool\n", r-1);
- /* Copy at least some bytes. */
- memcpy(&ret, reply+1, r - 1);
- if (reply[0] == sizeof(uint64_t)
- && r == sizeof(reply)) {
- close(fd);
- return ret;
- }
- }
- }
- close(fd);
- }
-
- /* Fallback: pid and time. */
- gettimeofday(&now, NULL);
- ret = getpid() * 100132289ULL + now.tv_sec * 1000000ULL + now.tv_usec;
- tdb->log(tdb, TDB_DEBUG_TRACE, tdb->log_priv,
- "tdb_open: random from getpid and time\n");
- return ret;
-}
-
-struct new_database {
- struct tdb_header hdr;
- struct tdb_freelist flist;
-};
-
-/* initialise a new database */
-static int tdb_new_database(struct tdb_context *tdb,
- struct tdb_attribute_seed *seed,
- struct tdb_header *hdr)
+#include
+#include
+
+static enum TDB_ERROR update_rec_hdr(struct tdb_context *tdb,
+ tdb_off_t off,
+ tdb_len_t keylen,
+ tdb_len_t datalen,
+ struct tdb_used_record *rec,
+ uint64_t h)
{
- /* We make it up in memory, then write it out if not internal */
- struct new_database newdb;
- unsigned int magic_len;
-
- /* Fill in the header */
- newdb.hdr.version = TDB_VERSION;
- if (seed)
- newdb.hdr.hash_seed = seed->seed;
- else
- newdb.hdr.hash_seed = random_number(tdb);
- newdb.hdr.hash_test = TDB_HASH_MAGIC;
- newdb.hdr.hash_test = tdb->khash(&newdb.hdr.hash_test,
- sizeof(newdb.hdr.hash_test),
- newdb.hdr.hash_seed,
- tdb->hash_priv);
- newdb.hdr.recovery = 0;
- memset(newdb.hdr.reserved, 0, sizeof(newdb.hdr.reserved));
- /* Initial hashes are empty. */
- memset(newdb.hdr.hashtable, 0, sizeof(newdb.hdr.hashtable));
-
- /* Free is empty. */
- newdb.hdr.free_list = offsetof(struct new_database, flist);
- memset(&newdb.flist, 0, sizeof(newdb.flist));
- set_header(NULL, &newdb.flist.hdr, 0,
- sizeof(newdb.flist) - sizeof(newdb.flist.hdr),
- sizeof(newdb.flist) - sizeof(newdb.flist.hdr), 1);
-
- /* Magic food */
- memset(newdb.hdr.magic_food, 0, sizeof(newdb.hdr.magic_food));
- strcpy(newdb.hdr.magic_food, TDB_MAGIC_FOOD);
-
- /* This creates an endian-converted database, as if read from disk */
- magic_len = sizeof(newdb.hdr.magic_food);
- tdb_convert(tdb,
- (char *)&newdb.hdr + magic_len, sizeof(newdb) - magic_len);
-
- *hdr = newdb.hdr;
-
- if (tdb->flags & TDB_INTERNAL) {
- tdb->map_size = sizeof(newdb);
- tdb->map_ptr = malloc(tdb->map_size);
- if (!tdb->map_ptr) {
- tdb->ecode = TDB_ERR_OOM;
- return -1;
- }
- memcpy(tdb->map_ptr, &newdb, tdb->map_size);
- return 0;
- }
- if (lseek(tdb->fd, 0, SEEK_SET) == -1)
- return -1;
-
- if (ftruncate(tdb->fd, 0) == -1)
- return -1;
+ uint64_t dataroom = rec_data_length(rec) + rec_extra_padding(rec);
+ enum TDB_ERROR ecode;
- if (!tdb_pwrite_all(tdb->fd, &newdb, sizeof(newdb), 0)) {
- tdb->ecode = TDB_ERR_IO;
- return -1;
+ ecode = set_header(tdb, rec, TDB_USED_MAGIC, keylen, datalen,
+ keylen + dataroom, h);
+ if (ecode == TDB_SUCCESS) {
+ ecode = tdb_write_convert(tdb, off, rec, sizeof(*rec));
}
- return 0;
+ return ecode;
}
-struct tdb_context *tdb_open(const char *name, int tdb_flags,
- int open_flags, mode_t mode,
- union tdb_attribute *attr)
+static enum TDB_ERROR replace_data(struct tdb_context *tdb,
+ struct hash_info *h,
+ struct tdb_data key, struct tdb_data dbuf,
+ tdb_off_t old_off, tdb_len_t old_room,
+ bool growing)
{
- struct tdb_context *tdb;
- struct stat st;
- int save_errno;
- uint64_t hash_test;
- unsigned v;
- struct tdb_header hdr;
- struct tdb_attribute_seed *seed = NULL;
-
- tdb = malloc(sizeof(*tdb));
- if (!tdb) {
- /* Can't log this */
- errno = ENOMEM;
- goto fail;
- }
- tdb->name = NULL;
- tdb->map_ptr = NULL;
- tdb->direct_access = 0;
- tdb->fd = -1;
- tdb->map_size = sizeof(struct tdb_header);
- tdb->ecode = TDB_SUCCESS;
- tdb->flags = tdb_flags;
- tdb->log = null_log_fn;
- tdb->log_priv = NULL;
- tdb->transaction = NULL;
- tdb_hash_init(tdb);
- tdb_io_init(tdb);
- tdb_lock_init(tdb);
-
- while (attr) {
- switch (attr->base.attr) {
- case TDB_ATTRIBUTE_LOG:
- tdb->log = attr->log.log_fn;
- tdb->log_priv = attr->log.log_private;
- break;
- case TDB_ATTRIBUTE_HASH:
- tdb->khash = attr->hash.hash_fn;
- tdb->hash_priv = attr->hash.hash_private;
- break;
- case TDB_ATTRIBUTE_SEED:
- seed = &attr->seed;
- break;
- default:
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_open: unknown attribute type %u\n",
- attr->base.attr);
- errno = EINVAL;
- goto fail;
- }
- attr = attr->base.next;
- }
+ tdb_off_t new_off;
+ enum TDB_ERROR ecode;
- if ((open_flags & O_ACCMODE) == O_WRONLY) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_open: can't open tdb %s write-only\n", name);
- errno = EINVAL;
- goto fail;
+ /* Allocate a new record. */
+ new_off = alloc(tdb, key.dsize, dbuf.dsize, h->h, TDB_USED_MAGIC,
+ growing);
+ if (TDB_OFF_IS_ERR(new_off)) {
+ return new_off;
}
- if ((open_flags & O_ACCMODE) == O_RDONLY) {
- tdb->read_only = true;
- /* read only databases don't do locking */
- tdb->flags |= TDB_NOLOCK;
- tdb->mmap_flags = PROT_READ;
+ /* We didn't like the existing one: remove it. */
+ if (old_off) {
+ tdb->stats.frees++;
+ ecode = add_free_record(tdb, old_off,
+ sizeof(struct tdb_used_record)
+ + key.dsize + old_room,
+ TDB_LOCK_WAIT, true);
+ if (ecode == TDB_SUCCESS)
+ ecode = replace_in_hash(tdb, h, new_off);
} else {
- tdb->read_only = false;
- tdb->mmap_flags = PROT_READ | PROT_WRITE;
+ ecode = add_to_hash(tdb, h, new_off);
}
-
- /* internal databases don't need any of the rest. */
- if (tdb->flags & TDB_INTERNAL) {
- tdb->flags |= (TDB_NOLOCK | TDB_NOMMAP);
- if (tdb_new_database(tdb, seed, &hdr) != 0) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_open: tdb_new_database failed!");
- goto fail;
- }
- tdb_convert(tdb, &hdr.hash_seed, sizeof(hdr.hash_seed));
- tdb->hash_seed = hdr.hash_seed;
- tdb_flist_init(tdb);
- return tdb;
- }
-
- if ((tdb->fd = open(name, open_flags, mode)) == -1) {
- tdb->log(tdb, TDB_DEBUG_WARNING, tdb->log_priv,
- "tdb_open: could not open file %s: %s\n",
- name, strerror(errno));
- goto fail; /* errno set by open(2) */
- }
-
- /* on exec, don't inherit the fd */
- v = fcntl(tdb->fd, F_GETFD, 0);
- fcntl(tdb->fd, F_SETFD, v | FD_CLOEXEC);
-
- /* ensure there is only one process initialising at once */
- if (tdb_lock_open(tdb, TDB_LOCK_WAIT|TDB_LOCK_NOCHECK) == -1) {
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_open: failed to get open lock on %s: %s\n",
- name, strerror(errno));
- goto fail; /* errno set by tdb_brlock */
- }
-
- if (!tdb_pread_all(tdb->fd, &hdr, sizeof(hdr), 0)
- || strcmp(hdr.magic_food, TDB_MAGIC_FOOD) != 0) {
- if (!(open_flags & O_CREAT)
- || tdb_new_database(tdb, seed, &hdr) == -1) {
- if (errno == 0) {
- errno = EIO; /* ie bad format or something */
- }
- goto fail;
- }
- } else if (hdr.version != TDB_VERSION) {
- if (hdr.version == bswap_64(TDB_VERSION))
- tdb->flags |= TDB_CONVERT;
- else {
- /* wrong version */
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_open: %s is unknown version 0x%llx\n",
- name, (long long)hdr.version);
- errno = EIO;
- goto fail;
- }
+ if (ecode != TDB_SUCCESS) {
+ return ecode;
}
- tdb_convert(tdb, &hdr, sizeof(hdr));
- tdb->hash_seed = hdr.hash_seed;
- hash_test = TDB_HASH_MAGIC;
- hash_test = tdb_hash(tdb, &hash_test, sizeof(hash_test));
- if (hdr.hash_test != hash_test) {
- /* wrong hash variant */
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_open: %s uses a different hash function\n",
- name);
- errno = EIO;
- goto fail;
- }
-
- if (fstat(tdb->fd, &st) == -1)
- goto fail;
-
- /* Is it already in the open list? If so, fail. */
- if (tdb_already_open(st.st_dev, st.st_ino)) {
- /* FIXME */
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_open: %s (%d,%d) is already open in this process\n",
- name, (int)st.st_dev, (int)st.st_ino);
- errno = EBUSY;
- goto fail;
- }
-
- tdb->name = strdup(name);
- if (!tdb->name) {
- errno = ENOMEM;
- goto fail;
- }
-
- tdb->device = st.st_dev;
- tdb->inode = st.st_ino;
- tdb_unlock_open(tdb);
-
- /* This make sure we have current map_size and mmap. */
- tdb->methods->oob(tdb, tdb->map_size + 1, true);
-
- /* Now it's fully formed, recover if necessary. */
- if (tdb_needs_recovery(tdb) && tdb_lock_and_recover(tdb) == -1) {
- errno = EIO;
- goto fail;
+ new_off += sizeof(struct tdb_used_record);
+ ecode = tdb->tdb2.io->twrite(tdb, new_off, key.dptr, key.dsize);
+ if (ecode != TDB_SUCCESS) {
+ return ecode;
}
- if (tdb_flist_init(tdb) == -1)
- goto fail;
-
- tdb->next = tdbs;
- tdbs = tdb;
- return tdb;
-
- fail:
- save_errno = errno;
-
- if (!tdb)
- return NULL;
-
-#ifdef TDB_TRACE
- close(tdb->tracefd);
-#endif
- if (tdb->map_ptr) {
- if (tdb->flags & TDB_INTERNAL) {
- free(tdb->map_ptr);
- } else
- tdb_munmap(tdb);
+ new_off += key.dsize;
+ ecode = tdb->tdb2.io->twrite(tdb, new_off, dbuf.dptr, dbuf.dsize);
+ if (ecode != TDB_SUCCESS) {
+ return ecode;
}
- free((char *)tdb->name);
- if (tdb->fd != -1)
- if (close(tdb->fd) != 0)
- tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
- "tdb_open: failed to close tdb->fd"
- " on error!\n");
- free(tdb);
- errno = save_errno;
- return NULL;
-}
-/* FIXME: modify, don't rewrite! */
-static int update_rec_hdr(struct tdb_context *tdb,
- tdb_off_t off,
- tdb_len_t keylen,
- tdb_len_t datalen,
- struct tdb_used_record *rec,
- uint64_t h)
-{
- uint64_t dataroom = rec_data_length(rec) + rec_extra_padding(rec);
-
- if (set_header(tdb, rec, keylen, datalen, keylen + dataroom, h))
- return -1;
+ if (tdb->flags & TDB_SEQNUM)
+ tdb_inc_seqnum(tdb);
- return tdb_write_convert(tdb, off, rec, sizeof(*rec));
+ return TDB_SUCCESS;
}
-/* Returns -1 on error, 0 on OK */
-static int replace_data(struct tdb_context *tdb,
- struct hash_info *h,
- struct tdb_data key, struct tdb_data dbuf,
- tdb_off_t old_off, tdb_len_t old_room,
- bool growing)
+static enum TDB_ERROR update_data(struct tdb_context *tdb,
+ tdb_off_t off,
+ struct tdb_data dbuf,
+ tdb_len_t extra)
{
- tdb_off_t new_off;
-
- /* Allocate a new record. */
- new_off = alloc(tdb, key.dsize, dbuf.dsize, h->h, growing);
- if (unlikely(new_off == TDB_OFF_ERR))
- return -1;
+ enum TDB_ERROR ecode;
- /* We didn't like the existing one: remove it. */
- if (old_off) {
- add_free_record(tdb, old_off,
- sizeof(struct tdb_used_record)
- + key.dsize + old_room);
- if (replace_in_hash(tdb, h, new_off) == -1)
- return -1;
- } else {
- if (add_to_hash(tdb, h, new_off) == -1)
- return -1;
+ ecode = tdb->tdb2.io->twrite(tdb, off, dbuf.dptr, dbuf.dsize);
+ if (ecode == TDB_SUCCESS && extra) {
+ /* Put a zero in; future versions may append other data. */
+ ecode = tdb->tdb2.io->twrite(tdb, off + dbuf.dsize, "", 1);
}
+ if (tdb->flags & TDB_SEQNUM)
+ tdb_inc_seqnum(tdb);
- new_off += sizeof(struct tdb_used_record);
- if (tdb->methods->write(tdb, new_off, key.dptr, key.dsize) == -1)
- return -1;
-
- new_off += key.dsize;
- if (tdb->methods->write(tdb, new_off, dbuf.dptr, dbuf.dsize) == -1)
- return -1;
-
- /* FIXME: tdb_increment_seqnum(tdb); */
- return 0;
+ return ecode;
}
-int tdb_store(struct tdb_context *tdb,
- struct tdb_data key, struct tdb_data dbuf, int flag)
+enum TDB_ERROR tdb_store(struct tdb_context *tdb,
+ struct tdb_data key, struct tdb_data dbuf, int flag)
{
struct hash_info h;
tdb_off_t off;
tdb_len_t old_room = 0;
struct tdb_used_record rec;
- int ret;
+ enum TDB_ERROR ecode;
+
+ if (tdb->flags & TDB_VERSION1) {
+ if (tdb1_store(tdb, key, dbuf, flag) == -1)
+ return tdb->last_error;
+ return TDB_SUCCESS;
+ }
off = find_and_lock(tdb, key, F_WRLCK, &h, &rec, NULL);
- if (unlikely(off == TDB_OFF_ERR))
- return -1;
+ if (TDB_OFF_IS_ERR(off)) {
+ return tdb->last_error = off;
+ }
/* Now we have lock on this hash bucket. */
if (flag == TDB_INSERT) {
if (off) {
- tdb->ecode = TDB_ERR_EXISTS;
- goto fail;
+ ecode = TDB_ERR_EXISTS;
+ goto out;
}
} else {
if (off) {
@@ -433,42 +137,43 @@ int tdb_store(struct tdb_context *tdb,
+ rec_extra_padding(&rec);
if (old_room >= dbuf.dsize) {
/* Can modify in-place. Easy! */
- if (update_rec_hdr(tdb, off,
- key.dsize, dbuf.dsize,
- &rec, h.h))
- goto fail;
- if (tdb->methods->write(tdb, off + sizeof(rec)
- + key.dsize,
- dbuf.dptr, dbuf.dsize))
- goto fail;
+ ecode = update_rec_hdr(tdb, off,
+ key.dsize, dbuf.dsize,
+ &rec, h.h);
+ if (ecode != TDB_SUCCESS) {
+ goto out;
+ }
+ ecode = update_data(tdb,
+ off + sizeof(rec)
+ + key.dsize, dbuf,
+ old_room - dbuf.dsize);
+ if (ecode != TDB_SUCCESS) {
+ goto out;
+ }
tdb_unlock_hashes(tdb, h.hlock_start,
h.hlock_range, F_WRLCK);
- return 0;
+ return tdb->last_error = TDB_SUCCESS;
}
- /* FIXME: See if right record is free? */
} else {
if (flag == TDB_MODIFY) {
/* if the record doesn't exist and we
are in TDB_MODIFY mode then we should fail
the store */
- tdb->ecode = TDB_ERR_NOEXIST;
- goto fail;
+ ecode = TDB_ERR_NOEXIST;
+ goto out;
}
}
}
/* If we didn't use the old record, this implies we're growing. */
- ret = replace_data(tdb, &h, key, dbuf, off, old_room, off != 0);
+ ecode = replace_data(tdb, &h, key, dbuf, off, old_room, off);
+out:
tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_WRLCK);
- return ret;
-
-fail:
- tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_WRLCK);
- return -1;
+ return tdb->last_error = ecode;
}
-int tdb_append(struct tdb_context *tdb,
- struct tdb_data key, struct tdb_data dbuf)
+enum TDB_ERROR tdb_append(struct tdb_context *tdb,
+ struct tdb_data key, struct tdb_data dbuf)
{
struct hash_info h;
tdb_off_t off;
@@ -476,11 +181,12 @@ int tdb_append(struct tdb_context *tdb,
tdb_len_t old_room = 0, old_dlen;
unsigned char *newdata;
struct tdb_data new_dbuf;
- int ret;
+ enum TDB_ERROR ecode;
off = find_and_lock(tdb, key, F_WRLCK, &h, &rec, NULL);
- if (unlikely(off == TDB_OFF_ERR))
- return -1;
+ if (TDB_OFF_IS_ERR(off)) {
+ return tdb->last_error = off;
+ }
if (off) {
old_dlen = rec_data_length(&rec);
@@ -488,35 +194,33 @@ int tdb_append(struct tdb_context *tdb,
/* Fast path: can append in place. */
if (rec_extra_padding(&rec) >= dbuf.dsize) {
- if (update_rec_hdr(tdb, off, key.dsize,
- old_dlen + dbuf.dsize, &rec, h.h))
- goto fail;
+ ecode = update_rec_hdr(tdb, off, key.dsize,
+ old_dlen + dbuf.dsize, &rec,
+ h.h);
+ if (ecode != TDB_SUCCESS) {
+ goto out;
+ }
off += sizeof(rec) + key.dsize + old_dlen;
- if (tdb->methods->write(tdb, off, dbuf.dptr,
- dbuf.dsize) == -1)
- goto fail;
-
- /* FIXME: tdb_increment_seqnum(tdb); */
- tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range,
- F_WRLCK);
- return 0;
+ ecode = update_data(tdb, off, dbuf,
+ rec_extra_padding(&rec));
+ goto out;
}
- /* FIXME: Check right record free? */
/* Slow path. */
newdata = malloc(key.dsize + old_dlen + dbuf.dsize);
if (!newdata) {
- tdb->ecode = TDB_ERR_OOM;
- tdb->log(tdb, TDB_DEBUG_FATAL, tdb->log_priv,
- "tdb_append: cannot allocate %llu bytes!\n",
- (long long)key.dsize + old_dlen + dbuf.dsize);
- goto fail;
+ ecode = tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
+ "tdb_append:"
+ " failed to allocate %zu bytes",
+ (size_t)(key.dsize + old_dlen
+ + dbuf.dsize));
+ goto out;
}
- if (tdb->methods->read(tdb, off + sizeof(rec) + key.dsize,
- newdata, old_dlen) != 0) {
- free(newdata);
- goto fail;
+ ecode = tdb->tdb2.io->tread(tdb, off + sizeof(rec) + key.dsize,
+ newdata, old_dlen);
+ if (ecode != TDB_SUCCESS) {
+ goto out_free_newdata;
}
memcpy(newdata + old_dlen, dbuf.dptr, dbuf.dsize);
new_dbuf.dptr = newdata;
@@ -527,135 +231,324 @@ int tdb_append(struct tdb_context *tdb,
}
/* If they're using tdb_append(), it implies they're growing record. */
- ret = replace_data(tdb, &h, key, new_dbuf, off, old_room, true);
- tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_WRLCK);
- free(newdata);
+ ecode = replace_data(tdb, &h, key, new_dbuf, off, old_room, true);
- return ret;
-
-fail:
+out_free_newdata:
+ free(newdata);
+out:
tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_WRLCK);
- return -1;
+ return tdb->last_error = ecode;
}
-struct tdb_data tdb_fetch(struct tdb_context *tdb, struct tdb_data key)
+enum TDB_ERROR tdb_fetch(struct tdb_context *tdb, struct tdb_data key,
+ struct tdb_data *data)
{
tdb_off_t off;
struct tdb_used_record rec;
struct hash_info h;
- struct tdb_data ret;
+ enum TDB_ERROR ecode;
off = find_and_lock(tdb, key, F_RDLCK, &h, &rec, NULL);
- if (unlikely(off == TDB_OFF_ERR))
- return tdb_null;
+ if (TDB_OFF_IS_ERR(off)) {
+ return tdb->last_error = off;
+ }
if (!off) {
- tdb->ecode = TDB_ERR_NOEXIST;
- ret = tdb_null;
+ ecode = TDB_ERR_NOEXIST;
} else {
- ret.dsize = rec_data_length(&rec);
- ret.dptr = tdb_alloc_read(tdb, off + sizeof(rec) + key.dsize,
- ret.dsize);
+ data->dsize = rec_data_length(&rec);
+ data->dptr = tdb_alloc_read(tdb, off + sizeof(rec) + key.dsize,
+ data->dsize);
+ if (TDB_PTR_IS_ERR(data->dptr)) {
+ ecode = TDB_PTR_ERR(data->dptr);
+ } else
+ ecode = TDB_SUCCESS;
}
tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_RDLCK);
- return ret;
+ return tdb->last_error = ecode;
+}
+
+bool tdb_exists(struct tdb_context *tdb, TDB_DATA key)
+{
+ tdb_off_t off;
+ struct tdb_used_record rec;
+ struct hash_info h;
+
+ off = find_and_lock(tdb, key, F_RDLCK, &h, &rec, NULL);
+ if (TDB_OFF_IS_ERR(off)) {
+ tdb->last_error = off;
+ return false;
+ }
+ tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_RDLCK);
+
+ tdb->last_error = TDB_SUCCESS;
+ return off ? true : false;
}
-int tdb_delete(struct tdb_context *tdb, struct tdb_data key)
+enum TDB_ERROR tdb_delete(struct tdb_context *tdb, struct tdb_data key)
{
tdb_off_t off;
struct tdb_used_record rec;
struct hash_info h;
+ enum TDB_ERROR ecode;
off = find_and_lock(tdb, key, F_WRLCK, &h, &rec, NULL);
- if (unlikely(off == TDB_OFF_ERR))
- return -1;
+ if (TDB_OFF_IS_ERR(off)) {
+ return tdb->last_error = off;
+ }
if (!off) {
- tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_WRLCK);
- tdb->ecode = TDB_ERR_NOEXIST;
- return -1;
+ ecode = TDB_ERR_NOEXIST;
+ goto unlock;
}
- if (delete_from_hash(tdb, &h) == -1)
- goto unlock_err;
+ ecode = delete_from_hash(tdb, &h);
+ if (ecode != TDB_SUCCESS) {
+ goto unlock;
+ }
/* Free the deleted entry. */
- if (add_free_record(tdb, off,
- sizeof(struct tdb_used_record)
- + rec_key_length(&rec)
- + rec_data_length(&rec)
- + rec_extra_padding(&rec)) != 0)
- goto unlock_err;
+ tdb->stats.frees++;
+ ecode = add_free_record(tdb, off,
+ sizeof(struct tdb_used_record)
+ + rec_key_length(&rec)
+ + rec_data_length(&rec)
+ + rec_extra_padding(&rec),
+ TDB_LOCK_WAIT, true);
- tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_WRLCK);
- return 0;
+ if (tdb->flags & TDB_SEQNUM)
+ tdb_inc_seqnum(tdb);
-unlock_err:
+unlock:
tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_WRLCK);
- return -1;
+ return tdb->last_error = ecode;
}
-int tdb_close(struct tdb_context *tdb)
+unsigned int tdb_get_flags(struct tdb_context *tdb)
{
- struct tdb_context **i;
- int ret = 0;
+ return tdb->flags;
+}
- tdb_trace(tdb, "tdb_close");
+static bool inside_transaction(const struct tdb_context *tdb)
+{
+ if (tdb->flags & TDB_VERSION1)
+ return tdb->tdb1.transaction != NULL;
+ else
+ return tdb->tdb2.transaction != NULL;
+}
- if (tdb->transaction) {
- tdb_transaction_cancel(tdb);
+static bool readonly_changable(struct tdb_context *tdb, const char *caller)
+{
+ if (inside_transaction(tdb)) {
+ tdb->last_error = tdb_logerr(tdb, TDB_ERR_EINVAL,
+ TDB_LOG_USE_ERROR,
+ "%s: can't change"
+ " TDB_RDONLY inside transaction",
+ caller);
+ return false;
}
- if (tdb->map_ptr) {
- if (tdb->flags & TDB_INTERNAL)
- free(tdb->map_ptr);
- else
- tdb_munmap(tdb);
+ if (tdb->file->allrecord_lock.count != 0
+ || tdb->file->num_lockrecs != 0) {
+ tdb->last_error = tdb_logerr(tdb, TDB_ERR_EINVAL,
+ TDB_LOG_USE_ERROR,
+ "%s: can't change"
+ " TDB_RDONLY holding locks",
+ caller);
+ return false;
}
- free((char *)tdb->name);
- if (tdb->fd != -1) {
- ret = close(tdb->fd);
- tdb->fd = -1;
- }
- free(tdb->lockrecs);
+ return true;
+}
- /* Remove from contexts list */
- for (i = &tdbs; *i; i = &(*i)->next) {
- if (*i == tdb) {
- *i = tdb->next;
- break;
- }
+void tdb_add_flag(struct tdb_context *tdb, unsigned flag)
+{
+ if (tdb->flags & TDB_INTERNAL) {
+ tdb->last_error = tdb_logerr(tdb, TDB_ERR_EINVAL,
+ TDB_LOG_USE_ERROR,
+ "tdb_add_flag: internal db");
+ return;
+ }
+ switch (flag) {
+ case TDB_NOLOCK:
+ tdb->flags |= TDB_NOLOCK;
+ break;
+ case TDB_NOMMAP:
+ tdb->flags |= TDB_NOMMAP;
+ tdb_munmap(tdb->file);
+ break;
+ case TDB_NOSYNC:
+ tdb->flags |= TDB_NOSYNC;
+ break;
+ case TDB_SEQNUM:
+ tdb->flags |= TDB_SEQNUM;
+ break;
+ case TDB_ALLOW_NESTING:
+ tdb->flags |= TDB_ALLOW_NESTING;
+ break;
+ case TDB_RDONLY:
+ if (readonly_changable(tdb, "tdb_add_flag"))
+ tdb->flags |= TDB_RDONLY;
+ break;
+ default:
+ tdb->last_error = tdb_logerr(tdb, TDB_ERR_EINVAL,
+ TDB_LOG_USE_ERROR,
+ "tdb_add_flag: Unknown flag %u",
+ flag);
}
-
-#ifdef TDB_TRACE
- close(tdb->tracefd);
-#endif
- free(tdb);
-
- return ret;
}
-enum TDB_ERROR tdb_error(struct tdb_context *tdb)
+void tdb_remove_flag(struct tdb_context *tdb, unsigned flag)
{
- return tdb->ecode;
+ if (tdb->flags & TDB_INTERNAL) {
+ tdb->last_error = tdb_logerr(tdb, TDB_ERR_EINVAL,
+ TDB_LOG_USE_ERROR,
+ "tdb_remove_flag: internal db");
+ return;
+ }
+ switch (flag) {
+ case TDB_NOLOCK:
+ tdb->flags &= ~TDB_NOLOCK;
+ break;
+ case TDB_NOMMAP:
+ tdb->flags &= ~TDB_NOMMAP;
+ tdb_mmap(tdb);
+ break;
+ case TDB_NOSYNC:
+ tdb->flags &= ~TDB_NOSYNC;
+ break;
+ case TDB_SEQNUM:
+ tdb->flags &= ~TDB_SEQNUM;
+ break;
+ case TDB_ALLOW_NESTING:
+ tdb->flags &= ~TDB_ALLOW_NESTING;
+ break;
+ case TDB_RDONLY:
+ if ((tdb->open_flags & O_ACCMODE) == O_RDONLY) {
+ tdb->last_error = tdb_logerr(tdb, TDB_ERR_EINVAL,
+ TDB_LOG_USE_ERROR,
+ "tdb_remove_flag: can't"
+ " remove TDB_RDONLY on tdb"
+ " opened with O_RDONLY");
+ break;
+ }
+ if (readonly_changable(tdb, "tdb_remove_flag"))
+ tdb->flags &= ~TDB_RDONLY;
+ break;
+ default:
+ tdb->last_error = tdb_logerr(tdb, TDB_ERR_EINVAL,
+ TDB_LOG_USE_ERROR,
+ "tdb_remove_flag: Unknown flag %u",
+ flag);
+ }
}
-const char *tdb_errorstr(struct tdb_context *tdb)
+const char *tdb_errorstr(enum TDB_ERROR ecode)
{
/* Gcc warns if you miss a case in the switch, so use that. */
- switch (tdb->ecode) {
+ switch (ecode) {
case TDB_SUCCESS: return "Success";
case TDB_ERR_CORRUPT: return "Corrupt database";
case TDB_ERR_IO: return "IO Error";
case TDB_ERR_LOCK: return "Locking error";
case TDB_ERR_OOM: return "Out of memory";
case TDB_ERR_EXISTS: return "Record exists";
- case TDB_ERR_NESTING: return "Transaction already started";
case TDB_ERR_EINVAL: return "Invalid parameter";
case TDB_ERR_NOEXIST: return "Record does not exist";
case TDB_ERR_RDONLY: return "write not permitted";
}
return "Invalid error code";
}
+
+enum TDB_ERROR tdb_error(struct tdb_context *tdb)
+{
+ return tdb->last_error;
+}
+
+enum TDB_ERROR COLD tdb_logerr(struct tdb_context *tdb,
+ enum TDB_ERROR ecode,
+ enum tdb_log_level level,
+ const char *fmt, ...)
+{
+ char *message;
+ va_list ap;
+ size_t len;
+ /* tdb_open paths care about errno, so save it. */
+ int saved_errno = errno;
+
+ if (!tdb->log_fn)
+ return ecode;
+
+ va_start(ap, fmt);
+ len = vasprintf(&message, fmt, ap);
+ va_end(ap);
+
+ if (len < 0) {
+ tdb->log_fn(tdb, TDB_LOG_ERROR, TDB_ERR_OOM,
+ "out of memory formatting message:", tdb->log_data);
+ tdb->log_fn(tdb, level, ecode, fmt, tdb->log_data);
+ } else {
+ tdb->log_fn(tdb, level, ecode, message, tdb->log_data);
+ free(message);
+ }
+ errno = saved_errno;
+ return ecode;
+}
+
+enum TDB_ERROR tdb_parse_record_(struct tdb_context *tdb,
+ TDB_DATA key,
+ enum TDB_ERROR (*parse)(TDB_DATA k,
+ TDB_DATA d,
+ void *data),
+ void *data)
+{
+ tdb_off_t off;
+ struct tdb_used_record rec;
+ struct hash_info h;
+ enum TDB_ERROR ecode;
+
+ off = find_and_lock(tdb, key, F_RDLCK, &h, &rec, NULL);
+ if (TDB_OFF_IS_ERR(off)) {
+ return tdb->last_error = off;
+ }
+
+ if (!off) {
+ ecode = TDB_ERR_NOEXIST;
+ } else {
+ const void *dptr;
+ dptr = tdb_access_read(tdb, off + sizeof(rec) + key.dsize,
+ rec_data_length(&rec), false);
+ if (TDB_PTR_IS_ERR(dptr)) {
+ ecode = TDB_PTR_ERR(dptr);
+ } else {
+ TDB_DATA d = tdb_mkdata(dptr, rec_data_length(&rec));
+
+ ecode = parse(key, d, data);
+ tdb_access_release(tdb, dptr);
+ }
+ }
+
+ tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_RDLCK);
+ return tdb->last_error = ecode;
+}
+
+const char *tdb_name(const struct tdb_context *tdb)
+{
+ return tdb->name;
+}
+
+int64_t tdb_get_seqnum(struct tdb_context *tdb)
+{
+ tdb_off_t off = tdb_read_off(tdb, offsetof(struct tdb_header, seqnum));
+ if (TDB_OFF_IS_ERR(off))
+ tdb->last_error = off;
+ else
+ tdb->last_error = TDB_SUCCESS;
+ return off;
+}
+
+
+int tdb_fd(const struct tdb_context *tdb)
+{
+ return tdb->file->fd;
+}