diff options
Diffstat (limited to 'src/backend/storage/smgr/smgr.c')
| -rw-r--r-- | src/backend/storage/smgr/smgr.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/src/backend/storage/smgr/smgr.c b/src/backend/storage/smgr/smgr.c index 9e6500ff981..6676e0cae5c 100644 --- a/src/backend/storage/smgr/smgr.c +++ b/src/backend/storage/smgr/smgr.c @@ -586,6 +586,26 @@ smgrnblocks_cached(SMgrRelation reln, ForkNumber forknum) * smgrtruncate() -- Truncate the given forks of supplied relation to * each specified numbers of blocks * + * Backward-compatible version of smgrtruncate2() for the benefit of external + * callers. This version isn't used in PostgreSQL core code, and can't be + * used in a critical section. + */ +void +smgrtruncate(SMgrRelation reln, ForkNumber *forknum, int nforks, + BlockNumber *nblocks) +{ + BlockNumber old_nblocks[MAX_FORKNUM + 1]; + + for (int i = 0; i < nforks; ++i) + old_nblocks[i] = smgrnblocks(reln, forknum[i]); + + return smgrtruncate2(reln, forknum, nforks, old_nblocks, nblocks); +} + +/* + * smgrtruncate2() -- Truncate the given forks of supplied relation to + * each specified numbers of blocks + * * The truncation is done immediately, so this can't be rolled back. * * The caller must hold AccessExclusiveLock on the relation, to ensure that @@ -597,8 +617,8 @@ smgrnblocks_cached(SMgrRelation reln, ForkNumber forknum) * to this relation should be called in between. */ void -smgrtruncate(SMgrRelation reln, ForkNumber *forknum, int nforks, - BlockNumber *old_nblocks, BlockNumber *nblocks) +smgrtruncate2(SMgrRelation reln, ForkNumber *forknum, int nforks, + BlockNumber *old_nblocks, BlockNumber *nblocks) { int i; |