Adding patch for getting O_DIRECT to work on linux; also enabling in build of BDB
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Dave Smith
parent
fb9230ffb9
commit
ce393ba7b2
2 changed files with 135 additions and 1 deletions
133
c_src/bdb-align.patch
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133
c_src/bdb-align.patch
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@ -0,0 +1,133 @@
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--- dbinc/mp.h.orig 2006-09-07 14:31:58.000000000 -0700
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+++ dbinc/mp.h 2007-01-06 19:14:56.000000000 -0800
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@@ -378,6 +378,23 @@
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#define BH_FREE_REUSE 0x02
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#define BH_FREE_UNLOCKED 0x04
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+#ifdef DIAG_MVCC
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+#define BH_ALIGNED
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+#define VM_PAGESIZE 4096
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+#endif
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+
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+/* Linux O_DIRECT needs aligned buffers. 2.6 kernel allows 512 byte
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+ * alignment, otherwise need page sized (4096).
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+ */
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+#if defined(linux) && !defined(BH_ALIGNED)
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+#define BH_ALIGNED
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+#ifdef LINUX_NEEDS_PAGE_ALIGNMENT
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+#define VM_PAGESIZE 4096
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+#else /* Linux 2.6+ */
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+#define VM_PAGESIZE 512
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+#endif
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+#endif
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+
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/*
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* BH --
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* Buffer header.
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@@ -404,7 +421,7 @@
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roff_t td_off; /* MVCC: creating TXN_DETAIL offset. */
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SH_CHAIN_ENTRY vc; /* MVCC: version chain. */
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-#ifdef DIAG_MVCC
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+#ifdef BH_ALIGNED
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u_int16_t align_off; /* Alignment offset for diagnostics.*/
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#endif
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@@ -465,15 +482,14 @@
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(dbc->txn != NULL && F_ISSET(dbc->txn, TXN_SNAPSHOT) && \
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dbc->txn->td != NULL && __memp_skip_curadj(dbc, pgno))
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-#if defined(DIAG_MVCC) && defined(HAVE_MPROTECT)
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-#define VM_PAGESIZE 4096
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-#define MVCC_BHSIZE(mfp, sz) do { \
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+#ifdef BH_ALIGNED
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+#define BHSIZE(mfp, sz) do { \
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sz += VM_PAGESIZE + sizeof(BH); \
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if (mfp->stat.st_pagesize < VM_PAGESIZE) \
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sz += VM_PAGESIZE - mfp->stat.st_pagesize; \
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} while (0)
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-#define MVCC_BHALIGN(mfp, p) do { \
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+#define BHALIGN(mfp, p) do { \
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if (mfp != NULL) { \
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BH *__bhp; \
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void *__orig = (p); \
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@@ -493,13 +509,19 @@
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} \
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} while (0)
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-#define MVCC_BHUNALIGN(mfp, p) do { \
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+#define BHUNALIGN(mfp, p) do { \
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if ((mfp) != NULL) { \
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BH *bhp = (BH *)(p); \
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(p) = ((u_int8_t *)bhp - bhp->align_off); \
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} \
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} while (0)
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+#else
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+#define BHSIZE(mfp, sz) do {} while (0)
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+#define BHALIGN(mfp, p) do {} while (0)
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+#define BHUNALIGN(mfp, p) do {} while (0)
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+#endif
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+#if defined(DIAG_MVCC) && defined(HAVE_MPROTECT)
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#ifdef linux
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#define MVCC_MPROTECT(buf, sz, mode) do { \
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int __ret = mprotect((buf), (sz), (mode)); \
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@@ -513,11 +535,7 @@
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} \
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} while (0)
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#endif /* linux */
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-
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-#else /* defined(DIAG_MVCC) && defined(HAVE_MPROTECT) */
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-#define MVCC_BHSIZE(mfp, sz) do {} while (0)
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-#define MVCC_BHALIGN(mfp, p) do {} while (0)
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-#define MVCC_BHUNALIGN(mfp, p) do {} while (0)
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+#else
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#define MVCC_MPROTECT(buf, size, mode) do {} while (0)
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#endif
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--- mp/mp_alloc.c.orig 2006-09-07 14:32:03.000000000 -0700
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+++ mp/mp_alloc.c 2007-01-06 19:14:56.000000000 -0800
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@@ -66,7 +66,7 @@
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if (mfp != NULL) {
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len = SSZA(BH, buf) + mfp->stat.st_pagesize;
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/* Add space for alignment padding for MVCC diagnostics. */
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- MVCC_BHSIZE(mfp, len);
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+ BHSIZE(mfp, len);
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}
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MPOOL_REGION_LOCK(dbenv, infop);
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@@ -91,10 +91,10 @@
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c_mp->stat.st_pages++;
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MPOOL_REGION_UNLOCK(dbenv, infop);
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/*
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- * For MVCC diagnostics, align the pointer so that the buffer
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+ * If necessary, align the pointer so that the buffer
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* starts on a page boundary.
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*/
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- MVCC_BHALIGN(mfp, p);
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+ BHALIGN(mfp, p);
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found: if (offsetp != NULL)
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*offsetp = R_OFFSET(infop, p);
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@@ -447,7 +447,7 @@
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MPOOLFILE *mfp;
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void *buf;
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{
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- MVCC_BHUNALIGN(mfp, buf);
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+ BHUNALIGN(mfp, buf);
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COMPQUIET(mfp, NULL);
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__db_shalloc_free(infop, buf);
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}
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--- mp/mp_fget.c.orig 2006-09-13 09:22:42.000000000 -0700
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+++ mp/mp_fget.c 2007-01-06 19:14:56.000000000 -0800
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@@ -708,7 +708,7 @@
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* the hash bucket's priority.
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*/
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/*lint --e{668} (flexelint: bhp cannot be NULL). */
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-#ifdef DIAG_MVCC
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+#ifdef BH_ALIGNED
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memset(bhp, 0, SSZ(BH, align_off));
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#else
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memset(bhp, 0, sizeof(BH));
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@ -19,8 +19,9 @@ rm -rf system db-${DB_VER}
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## Untar and build everything
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tar -xzf db-${DB_VER}.tar.gz && \
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(cd db-${DB_VER} && patch -p0 < ../bdb-align.patch ) && \
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(cd db-${DB_VER}/build_unix && \
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../dist/configure --prefix=$WORKDIR --disable-shared --with-pic && make && ranlib libdb-*.a && make install) && \
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../dist/configure --prefix=$WORKDIR --disable-shared --enable-o_direct --with-pic && make && ranlib libdb-*.a && make install) && \
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mkdir -p $TARGETDIR/utils && \
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rm -rf db-${DB_VER}
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