os/bluestore/BlueFS: convert all read/write IO to direct IO.

RocksDB is the sole user of BlueFS, after BlueFS uses direct IO,
RocksDB will have to use its own block cache to cache raw data
blocks.

Signed-off-by: Jianjian Huo <jianjian.huo@ssi.samsung.com>

diff --git a/src/os/bluestore/BlueFS.cc b/src/os/bluestore/BlueFS.cc
index ff1dc71b94475cc5c14a9de1d5c48c8cccbefd7e..da0ff9a4c73c1394995455c5abc57d410c51f8a9 100644 (file)
--- a/src/os/bluestore/BlueFS.cc
+++ b/src/os/bluestore/BlueFS.cc
@@ -738,7 +738,7 @@ int BlueFS::_read_random(
     }
     dout(20) << __func__ << " read buffered " << x_off << "~" << l << " of "
               << *p << dendl;
-    int r = bdev[p->bdev]->read_random(p->offset + x_off, l, out, true);
+    int r = bdev[p->bdev]->read_random(p->offset + x_off, l, out, false);
     assert(r == 0);
     off += l;
     len -= l;
@@ -797,7 +797,7 @@ int BlueFS::_read(
       dout(20) << __func__ << " fetching " << x_off << "~" << l << " of "
               << *p << dendl;
       int r = bdev[p->bdev]->read(p->offset + x_off, l, &buf->bl, ioc[p->bdev],
-                                 true);
+                                 false);
       assert(r == 0);
     }
     left = buf->get_buf_remaining(off);
@@ -1121,7 +1121,7 @@ int BlueFS::_flush_range(FileWriter *h, uint64_t offset, uint64_t length)
       h->tail_block.substr_of(bl, bl.length() - tail, tail);
       t.append_zero(super.block_size - tail);
     }
-    bdev[p->bdev]->aio_write(p->offset + x_off, t, h->iocv[p->bdev], true);
+    bdev[p->bdev]->aio_write(p->offset + x_off, t, h->iocv[p->bdev], false);
     bloff += x_len;
     length -= x_len;
     ++p;