diff options
Diffstat (limited to 'src/backend/storage/smgr/md.c')
| -rw-r--r-- | src/backend/storage/smgr/md.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/src/backend/storage/smgr/md.c b/src/backend/storage/smgr/md.c index d9d0367c89d..d1124d46f49 100644 --- a/src/backend/storage/smgr/md.c +++ b/src/backend/storage/smgr/md.c @@ -453,6 +453,10 @@ mdextend(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum, int nbytes; MdfdVec *v; + /* If this build supports direct I/O, the buffer must be I/O aligned. */ + if (PG_O_DIRECT != 0 && PG_IO_ALIGN_SIZE <= BLCKSZ) + Assert((uintptr_t) buffer == TYPEALIGN(PG_IO_ALIGN_SIZE, buffer)); + /* This assert is too expensive to have on normally ... */ #ifdef CHECK_WRITE_VS_EXTEND Assert(blocknum >= mdnblocks(reln, forknum)); @@ -783,6 +787,10 @@ mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum, int nbytes; MdfdVec *v; + /* If this build supports direct I/O, the buffer must be I/O aligned. */ + if (PG_O_DIRECT != 0 && PG_IO_ALIGN_SIZE <= BLCKSZ) + Assert((uintptr_t) buffer == TYPEALIGN(PG_IO_ALIGN_SIZE, buffer)); + TRACE_POSTGRESQL_SMGR_MD_READ_START(forknum, blocknum, reln->smgr_rlocator.locator.spcOid, reln->smgr_rlocator.locator.dbOid, @@ -848,6 +856,10 @@ mdwrite(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum, int nbytes; MdfdVec *v; + /* If this build supports direct I/O, the buffer must be I/O aligned. */ + if (PG_O_DIRECT != 0 && PG_IO_ALIGN_SIZE <= BLCKSZ) + Assert((uintptr_t) buffer == TYPEALIGN(PG_IO_ALIGN_SIZE, buffer)); + /* This assert is too expensive to have on normally ... */ #ifdef CHECK_WRITE_VS_EXTEND Assert(blocknum < mdnblocks(reln, forknum)); @@ -1429,7 +1441,8 @@ _mdfd_getseg(SMgrRelation reln, ForkNumber forknum, BlockNumber blkno, */ if (nblocks < ((BlockNumber) RELSEG_SIZE)) { - char *zerobuf = palloc0(BLCKSZ); + char *zerobuf = palloc_aligned(BLCKSZ, PG_IO_ALIGN_SIZE, + MCXT_ALLOC_ZERO); mdextend(reln, forknum, nextsegno * ((BlockNumber) RELSEG_SIZE) - 1, |