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author | Simo Sorce <idra@samba.org> | 2008-09-05 10:13:10 -0400 |
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committer | Simo Sorce <idra@samba.org> | 2008-09-05 10:13:10 -0400 |
commit | 23b61265b85f321ae2ceddc6c75771f8881566d8 (patch) | |
tree | bb43d44fb09247c8e12d58371e56af911a7c0db9 /tdb/common/freelistcheck.c | |
download | sssd-23b61265b85f321ae2ceddc6c75771f8881566d8.tar.gz sssd-23b61265b85f321ae2ceddc6c75771f8881566d8.tar.bz2 sssd-23b61265b85f321ae2ceddc6c75771f8881566d8.zip |
Initial Import
Diffstat (limited to 'tdb/common/freelistcheck.c')
-rw-r--r-- | tdb/common/freelistcheck.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/tdb/common/freelistcheck.c b/tdb/common/freelistcheck.c new file mode 100644 index 00000000..efc050df --- /dev/null +++ b/tdb/common/freelistcheck.c @@ -0,0 +1,107 @@ +/* + Unix SMB/CIFS implementation. + + trivial database library + + Copyright (C) Jeremy Allison 2006 + + ** NOTE! The following LGPL license applies to the tdb + ** library. This does NOT imply that all of Samba is released + ** under the LGPL + + 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 "tdb_private.h" + +/* Check the freelist is good and contains no loops. + Very memory intensive - only do this as a consistency + checker. Heh heh - uses an in memory tdb as the storage + for the "seen" record list. For some reason this strikes + me as extremely clever as I don't have to write another tree + data structure implementation :-). + */ + +static int seen_insert(struct tdb_context *mem_tdb, tdb_off_t rec_ptr) +{ + TDB_DATA key, data; + + memset(&data, '\0', sizeof(data)); + key.dptr = (unsigned char *)&rec_ptr; + key.dsize = sizeof(rec_ptr); + return tdb_store(mem_tdb, key, data, TDB_INSERT); +} + +int tdb_validate_freelist(struct tdb_context *tdb, int *pnum_entries) +{ + struct tdb_context *mem_tdb = NULL; + struct list_struct rec; + tdb_off_t rec_ptr, last_ptr; + int ret = -1; + + *pnum_entries = 0; + + mem_tdb = tdb_open("flval", tdb->header.hash_size, + TDB_INTERNAL, O_RDWR, 0600); + if (!mem_tdb) { + return -1; + } + + if (tdb_lock(tdb, -1, F_WRLCK) == -1) { + tdb_close(mem_tdb); + return 0; + } + + last_ptr = FREELIST_TOP; + + /* Store the FREELIST_TOP record. */ + if (seen_insert(mem_tdb, last_ptr) == -1) { + ret = TDB_ERRCODE(TDB_ERR_CORRUPT, -1); + goto fail; + } + + /* read in the freelist top */ + if (tdb_ofs_read(tdb, FREELIST_TOP, &rec_ptr) == -1) { + goto fail; + } + + while (rec_ptr) { + + /* If we can't store this record (we've seen it + before) then the free list has a loop and must + be corrupt. */ + + if (seen_insert(mem_tdb, rec_ptr)) { + ret = TDB_ERRCODE(TDB_ERR_CORRUPT, -1); + goto fail; + } + + if (tdb_rec_free_read(tdb, rec_ptr, &rec) == -1) { + goto fail; + } + + /* move to the next record */ + last_ptr = rec_ptr; + rec_ptr = rec.next; + *pnum_entries += 1; + } + + ret = 0; + + fail: + + tdb_close(mem_tdb); + tdb_unlock(tdb, -1, F_WRLCK); + return ret; +} |