diff options
Diffstat (limited to 'source4/lib/dbwrap')
| -rw-r--r-- | source4/lib/dbwrap/config.mk | 6 | ||||
| -rw-r--r-- | source4/lib/dbwrap/dbwrap.c | 39 | ||||
| -rw-r--r-- | source4/lib/dbwrap/dbwrap.h | 54 | ||||
| -rw-r--r-- | source4/lib/dbwrap/dbwrap_ctdb.c | 192 | ||||
| -rw-r--r-- | source4/lib/dbwrap/dbwrap_tdb.c | 267 |
5 files changed, 558 insertions, 0 deletions
diff --git a/source4/lib/dbwrap/config.mk b/source4/lib/dbwrap/config.mk new file mode 100644 index 0000000000..34e2629b16 --- /dev/null +++ b/source4/lib/dbwrap/config.mk @@ -0,0 +1,6 @@ +[SUBSYSTEM::LIBDBWRAP] +PUBLIC_DEPENDENCIES = \ + LIBTDB ctdb + +LIBDBWRAP_OBJ_FILES = $(addprefix $(libdbwrapsrcdir)/, dbwrap.o dbwrap_tdb.o dbwrap_ctdb.o) + diff --git a/source4/lib/dbwrap/dbwrap.c b/source4/lib/dbwrap/dbwrap.c new file mode 100644 index 0000000000..be48e97b5a --- /dev/null +++ b/source4/lib/dbwrap/dbwrap.c @@ -0,0 +1,39 @@ +/* + Unix SMB/CIFS implementation. + + database wrapper code + + Copyright (C) Andrew Tridgell 2007 + Copyright (C) Volker Lendecke 2005 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include "includes.h" +#include "lib/tdb/include/tdb.h" +#include "lib/dbwrap/dbwrap.h" +#include "param/param.h" + +/** + open a temporary database + */ +struct db_context *db_tmp_open(TALLOC_CTX *mem_ctx, struct loadparm_context *lp_ctx, const char *name, int tdb_flags) +{ + if (lp_parm_bool(lp_ctx, NULL, "ctdb", "enable", false) && + lp_parm_bool(lp_ctx, NULL, "ctdb", name, true)) { + return db_tmp_open_ctdb(mem_ctx, lp_ctx, name, tdb_flags); + } + + return db_tmp_open_tdb(mem_ctx, lp_ctx, name, tdb_flags); +} diff --git a/source4/lib/dbwrap/dbwrap.h b/source4/lib/dbwrap/dbwrap.h new file mode 100644 index 0000000000..1a3b3f5273 --- /dev/null +++ b/source4/lib/dbwrap/dbwrap.h @@ -0,0 +1,54 @@ +/* + Unix SMB/CIFS implementation. + + database wrapper code + + Copyright (C) Volker Lendecks 2005-2007 + Copyright (C) Andrew Tridgell 2007 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +struct db_record { + TDB_DATA key, value; + NTSTATUS (*store)(struct db_record *rec, TDB_DATA data, int flag); + NTSTATUS (*delete_rec)(struct db_record *rec); + void *private_data; +}; + +struct db_context { + struct db_record *(*fetch_locked)(struct db_context *db, + TALLOC_CTX *mem_ctx, + TDB_DATA key); + int (*fetch)(struct db_context *db, TALLOC_CTX *mem_ctx, + TDB_DATA key, TDB_DATA *data); + int (*traverse)(struct db_context *db, + int (*f)(struct db_record *db, + void *private_data), + void *private_data); + int (*traverse_read)(struct db_context *db, + int (*f)(struct db_record *db, + void *private_data), + void *private_data); + int (*get_seqnum)(struct db_context *db); + void *private_data; +}; + +struct loadparm_context; +struct db_context *db_tmp_open(TALLOC_CTX *mem_ctx, struct loadparm_context *lp_ctx, const char *name, int tdb_flags); + + +/* backends */ +struct db_context *db_tmp_open_tdb(TALLOC_CTX *mem_ctx, struct loadparm_context *lp_ctx, const char *name, int tdb_flags); +struct db_context *db_tmp_open_ctdb(TALLOC_CTX *mem_ctx, struct loadparm_context *lp_ctx, const char *name, int tdb_flags); diff --git a/source4/lib/dbwrap/dbwrap_ctdb.c b/source4/lib/dbwrap/dbwrap_ctdb.c new file mode 100644 index 0000000000..f3daa7dfe5 --- /dev/null +++ b/source4/lib/dbwrap/dbwrap_ctdb.c @@ -0,0 +1,192 @@ +/* + Unix SMB/CIFS implementation. + + Database interface wrapper around ctdbd + + Copyright (C) Andrew Tridgell 2007 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include "includes.h" +#include "lib/tdb/include/tdb.h" +#include "lib/dbwrap/dbwrap.h" +#include "cluster/cluster.h" +#include "cluster/ctdb/include/ctdb.h" + +static NTSTATUS db_ctdb_store(struct db_record *rec, TDB_DATA data, int flag) +{ + struct ctdb_record_handle *h = talloc_get_type(rec->private_data, struct ctdb_record_handle); + int ret; + + ret = ctdb_record_store(h, data); + if (ret != 0) { + return NT_STATUS_INTERNAL_DB_CORRUPTION; + } + return NT_STATUS_OK; +} + +static NTSTATUS db_ctdb_delete(struct db_record *rec) +{ + return rec->store(rec, tdb_null, TDB_REPLACE); +} + + +static struct db_record *db_ctdb_fetch_locked(struct db_context *db, + TALLOC_CTX *mem_ctx, + TDB_DATA key) +{ + struct db_record *rec; + struct ctdb_record_handle *h; + struct ctdb_db_context *cdb = talloc_get_type(db->private_data, struct ctdb_db_context); + + rec = talloc(mem_ctx, struct db_record); + if (!rec) return NULL; + + h = ctdb_fetch_lock(cdb, rec, key, &rec->value); + if (h == NULL) { + talloc_free(rec); + return NULL; + } + + rec->private_data = h; + rec->store = db_ctdb_store; + rec->delete_rec = db_ctdb_delete; + + return rec; +} + +/* + fetch (unlocked, no migration) operation on ctdb + */ +static int db_ctdb_fetch(struct db_context *db, TALLOC_CTX *mem_ctx, + TDB_DATA key, TDB_DATA *data) +{ + struct ctdb_db_context *cdb = talloc_get_type(db->private_data, struct ctdb_db_context); + + return ctdb_fetch(cdb, mem_ctx, key, data); +} + +struct traverse_state { + struct db_context *db; + int (*fn)(struct db_record *rec, void *private_data); + void *private_data; +}; + +static int traverse_callback(struct ctdb_context *ctdb, TDB_DATA key, TDB_DATA data, void *private_data) +{ + struct traverse_state *state = (struct traverse_state *)private_data; + struct db_record *rec; + TALLOC_CTX *tmp_ctx = talloc_new(state->db); + /* we have to give them a locked record to prevent races */ + rec = db_ctdb_fetch_locked(state->db, tmp_ctx, key); + if (rec && rec->value.dsize > 0) { + state->fn(rec, state->private_data); + } + talloc_free(tmp_ctx); + return 0; +} + +static int db_ctdb_traverse(struct db_context *db, + int (*fn)(struct db_record *rec, void *private_data), + void *private_data) +{ + struct ctdb_db_context *cdb = talloc_get_type(db->private_data, struct ctdb_db_context); + struct traverse_state state; + + state.db = db; + state.fn = fn; + state.private_data = private_data; + + ctdb_traverse(cdb, traverse_callback, &state); + return 0; +} + +static NTSTATUS db_ctdb_store_deny(struct db_record *rec, TDB_DATA data, int flag) +{ + return NT_STATUS_MEDIA_WRITE_PROTECTED; +} + +static NTSTATUS db_ctdb_delete_deny(struct db_record *rec) +{ + return NT_STATUS_MEDIA_WRITE_PROTECTED; +} + +static int traverse_read_callback(struct ctdb_context *ctdb, + TDB_DATA key, TDB_DATA data, void *private_data) +{ + struct traverse_state *state = (struct traverse_state *)private_data; + struct db_record rec; + rec.key = key; + rec.value = data; + rec.store = db_ctdb_store_deny; + rec.delete_rec = db_ctdb_delete_deny; + rec.private_data = state->db; + state->fn(&rec, state->private_data); + return 0; +} + +static int db_ctdb_traverse_read(struct db_context *db, + int (*fn)(struct db_record *rec, + void *private_data), + void *private_data) +{ + struct traverse_state state; + struct ctdb_db_context *cdb = talloc_get_type(db->private_data, struct ctdb_db_context); + + state.db = db; + state.fn = fn; + state.private_data = private_data; + + ctdb_traverse(cdb, traverse_read_callback, &state); + return 0; +} + +static int db_ctdb_get_seqnum(struct db_context *db) +{ + DEBUG(0,("ctdb_get_seqnum not implemented\n")); + return -1; +} + +struct db_context *db_tmp_open_ctdb(TALLOC_CTX *mem_ctx, struct loadparm_context *lp_ctx, + const char *name, int tdb_flags) +{ + struct db_context *db; + struct ctdb_context *ctdb = talloc_get_type(cluster_backend_handle(), + struct ctdb_context); + struct ctdb_db_context *cdb; + + db = talloc_zero(mem_ctx, struct db_context); + if (db == NULL) { + return NULL; + } + + cdb = ctdb_attach(ctdb, name); + if (!cdb) { + DEBUG(0,("Failed to attach to ctdb database '%s'\n", name)); + talloc_free(db); + return NULL; + } + + db->private_data = cdb; + db->fetch_locked = db_ctdb_fetch_locked; + db->fetch = db_ctdb_fetch; + db->traverse = db_ctdb_traverse; + db->traverse_read = db_ctdb_traverse_read; + db->get_seqnum = db_ctdb_get_seqnum; + + DEBUG(3,("db_tmp_open_ctdb: opened database '%s'\n", name)); + + return db; +} diff --git a/source4/lib/dbwrap/dbwrap_tdb.c b/source4/lib/dbwrap/dbwrap_tdb.c new file mode 100644 index 0000000000..fae73a1db8 --- /dev/null +++ b/source4/lib/dbwrap/dbwrap_tdb.c @@ -0,0 +1,267 @@ +/* + Unix SMB/CIFS implementation. + + Database interface wrapper around tdb + + Copyright (C) Volker Lendecke 2005 + Copyright (C) Andrew Tridgell 2007 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include "includes.h" +#include "lib/tdb/include/tdb.h" +#include "lib/dbwrap/dbwrap.h" +#include "system/filesys.h" +#include "tdb_wrap.h" +#include "param/param.h" + +struct db_tdb_ctx { + struct tdb_wrap *wtdb; +}; + +static NTSTATUS db_tdb_store(struct db_record *rec, TDB_DATA data, int flag); +static NTSTATUS db_tdb_delete(struct db_record *rec); + +static int db_tdb_record_destr(struct db_record* data) +{ + struct db_tdb_ctx *ctx = talloc_get_type(data->private_data, struct db_tdb_ctx); + + if (tdb_chainunlock(ctx->wtdb->tdb, data->key) != 0) { + DEBUG(0, ("tdb_chainunlock failed\n")); + return -1; + } + return 0; +} + +static int db_tdb_fetch(struct db_context *db, TALLOC_CTX *mem_ctx, TDB_DATA key, TDB_DATA *data) +{ + struct db_tdb_ctx *ctx = talloc_get_type(db->private_data, struct db_tdb_ctx); + TDB_DATA value; + + value = tdb_fetch(ctx->wtdb->tdb, key); + if (value.dptr == NULL) { + return -1; + } + + data->dsize = value.dsize; + data->dptr = (uint8_t *)talloc_memdup(mem_ctx, value.dptr, value.dsize); + free(value.dptr); + if (data->dptr == NULL) { + errno = ENOMEM; + return -1; + } + + return 0; +} + +static struct db_record *db_tdb_fetch_locked(struct db_context *db, + TALLOC_CTX *mem_ctx, TDB_DATA key) +{ + struct db_tdb_ctx *ctx = talloc_get_type(db->private_data, struct db_tdb_ctx); + struct db_record *result; + TDB_DATA value; + + result = talloc(mem_ctx, struct db_record); + if (result == NULL) { + return NULL; + } + + result->key.dsize = key.dsize; + result->key.dptr = (uint8_t *)talloc_memdup(result, key.dptr, key.dsize); + if (result->key.dptr == NULL) { + talloc_free(result); + return NULL; + } + + result->value.dptr = NULL; + result->value.dsize = 0; + result->private_data = talloc_reference(result, ctx); + result->store = db_tdb_store; + result->delete_rec = db_tdb_delete; + + if (tdb_chainlock(ctx->wtdb->tdb, key) != 0) { + talloc_free(result); + return NULL; + } + + talloc_set_destructor(result, db_tdb_record_destr); + + value = tdb_fetch(ctx->wtdb->tdb, key); + + if (value.dptr == NULL) { + return result; + } + + result->value.dsize = value.dsize; + result->value.dptr = (uint8_t *)talloc_memdup(result, value.dptr, + value.dsize); + free(value.dptr); + if (result->value.dptr == NULL) { + talloc_free(result); + return NULL; + } + + return result; +} + +static NTSTATUS db_tdb_store(struct db_record *rec, TDB_DATA data, int flag) +{ + struct db_tdb_ctx *ctx = talloc_get_type(rec->private_data, struct db_tdb_ctx); + + /* + * This has a bug: We need to replace rec->value for correct + * operation, but right now brlock and locking don't use the value + * anymore after it was stored. + */ + + return (tdb_store(ctx->wtdb->tdb, rec->key, data, flag) == 0) ? + NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL; +} + +static NTSTATUS db_tdb_delete(struct db_record *rec) +{ + struct db_tdb_ctx *ctx = talloc_get_type(rec->private_data, struct db_tdb_ctx); + + return (tdb_delete(ctx->wtdb->tdb, rec->key) == 0) ? + NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL; +} + +struct db_tdb_traverse_ctx { + struct db_context *db; + int (*f)(struct db_record *rec, void *private_data); + void *private_data; +}; + +static int db_tdb_traverse_func(TDB_CONTEXT *tdb, TDB_DATA kbuf, TDB_DATA dbuf, + void *private_data) +{ + struct db_tdb_traverse_ctx *ctx = + (struct db_tdb_traverse_ctx *)private_data; + struct db_record rec; + + rec.key = kbuf; + rec.value = dbuf; + rec.store = db_tdb_store; + rec.delete_rec = db_tdb_delete; + rec.private_data = ctx->db->private_data; + + return ctx->f(&rec, ctx->private_data); +} + +static int db_tdb_traverse(struct db_context *db, + int (*f)(struct db_record *rec, void *private_data), + void *private_data) +{ + struct db_tdb_ctx *db_ctx = + talloc_get_type(db->private_data, struct db_tdb_ctx); + struct db_tdb_traverse_ctx ctx; + + ctx.db = db; + ctx.f = f; + ctx.private_data = private_data; + return tdb_traverse(db_ctx->wtdb->tdb, db_tdb_traverse_func, &ctx); +} + +static NTSTATUS db_tdb_store_deny(struct db_record *rec, TDB_DATA data, int flag) +{ + return NT_STATUS_MEDIA_WRITE_PROTECTED; +} + +static NTSTATUS db_tdb_delete_deny(struct db_record *rec) +{ + return NT_STATUS_MEDIA_WRITE_PROTECTED; +} + +static int db_tdb_traverse_read_func(TDB_CONTEXT *tdb, TDB_DATA kbuf, TDB_DATA dbuf, + void *private_data) +{ + struct db_tdb_traverse_ctx *ctx = + (struct db_tdb_traverse_ctx *)private_data; + struct db_record rec; + + rec.key = kbuf; + rec.value = dbuf; + rec.store = db_tdb_store_deny; + rec.delete_rec = db_tdb_delete_deny; + rec.private_data = ctx->db->private_data; + + return ctx->f(&rec, ctx->private_data); +} + +static int db_tdb_traverse_read(struct db_context *db, + int (*f)(struct db_record *rec, void *private_data), + void *private_data) +{ + struct db_tdb_ctx *db_ctx = + talloc_get_type(db->private_data, struct db_tdb_ctx); + struct db_tdb_traverse_ctx ctx; + + ctx.db = db; + ctx.f = f; + ctx.private_data = private_data; + return tdb_traverse_read(db_ctx->wtdb->tdb, db_tdb_traverse_read_func, &ctx); +} + +static int db_tdb_get_seqnum(struct db_context *db) + +{ + struct db_tdb_ctx *db_ctx = + talloc_get_type(db->private_data, struct db_tdb_ctx); + return tdb_get_seqnum(db_ctx->wtdb->tdb); +} + +/* + open a temporary database + */ +struct db_context *db_tmp_open_tdb(TALLOC_CTX *mem_ctx, struct loadparm_context *lp_ctx, + const char *name, int tdb_flags) +{ + struct db_context *result; + struct db_tdb_ctx *db_tdb; + char *path; + + result = talloc_zero(mem_ctx, struct db_context); + if (result == NULL) goto failed; + + db_tdb = talloc(result, struct db_tdb_ctx); + if (db_tdb == NULL) goto failed; + + result->private_data = db_tdb; + + /* the name passed in should not be a full path, it should be + just be the db name */ + path = smbd_tmp_path(result, lp_ctx, name); + + db_tdb->wtdb = tdb_wrap_open(db_tdb, path, 0, tdb_flags, + O_CREAT|O_RDWR, 0666); + if (db_tdb->wtdb == NULL) { + DEBUG(3, ("Could not open tdb '%s': %s\n", path, strerror(errno))); + goto failed; + } + + talloc_free(path); + + result->fetch_locked = db_tdb_fetch_locked; + result->fetch = db_tdb_fetch; + result->traverse = db_tdb_traverse; + result->traverse_read = db_tdb_traverse_read; + result->get_seqnum = db_tdb_get_seqnum; + + return result; + + failed: + talloc_free(result); + return NULL; +} |