From: Sage Weil <sage@redhat.com>
Date: Fri, 11 Mar 2016 16:13:02 +0000 (-0500)
Subject: os/filestore: add filestore_punch_hole = false option
X-Git-Tag: v10.1.0~114^2
X-Git-Url: http://git.apps.os.sepia.ceph.com/?a=commitdiff_plain;h=55a66975ef7e8e354b554a5682d36c980aa883ac;p=ceph-ci.git

os/filestore: add filestore_punch_hole = false option

Make punch hole usage optional.

Default to off, since it's relatively untested.

Signed-off-by: Sage Weil <sage@redhat.com>
---

diff --git a/src/common/config_opts.h b/src/common/config_opts.h
index 79837bec6f6..a6f7428f226 100644
--- a/src/common/config_opts.h
+++ b/src/common/config_opts.h
@@ -1016,6 +1016,7 @@ OPTION(filestore_btrfs_clone_range, OPT_BOOL, true)
 OPTION(filestore_zfs_snap, OPT_BOOL, false) // zfsonlinux is still unstable
 OPTION(filestore_fsync_flushes_journal_data, OPT_BOOL, false)
 OPTION(filestore_fiemap, OPT_BOOL, false)     // (try to) use fiemap
+OPTION(filestore_punch_hole, OPT_BOOL, false)
 OPTION(filestore_seek_data_hole, OPT_BOOL, false)     // (try to) use seek_data/hole
 OPTION(filestore_fadvise, OPT_BOOL, true)
 //collect device partition information for management application to use
diff --git a/src/os/filestore/FileStore.cc b/src/os/filestore/FileStore.cc
index fea8618b851..26d56c9713d 100644
--- a/src/os/filestore/FileStore.cc
+++ b/src/os/filestore/FileStore.cc
@@ -3239,57 +3239,60 @@ int FileStore::_zero(const coll_t& cid, const ghobject_t& oid, uint64_t offset,
   dout(15) << "zero " << cid << "/" << oid << " " << offset << "~" << len << dendl;
   int ret = 0;
 
+  if (g_conf->filestore_punch_hole) {
 #ifdef CEPH_HAVE_FALLOCATE
 # if !defined(DARWIN) && !defined(__FreeBSD__)
 #    ifdef FALLOC_FL_KEEP_SIZE
-  // first try to punch a hole.
-  FDRef fd;
-  ret = lfn_open(cid, oid, false, &fd);
-  if (ret < 0) {
-    goto out;
-  }
+    // first try to punch a hole.
+    FDRef fd;
+    ret = lfn_open(cid, oid, false, &fd);
+    if (ret < 0) {
+      goto out;
+    }
 
-  struct stat st;
-  ret = ::fstat(**fd, &st);
-  if (ret < 0) {
-    ret = -errno;
-    lfn_close(fd);
-    goto out;
-  }
+    struct stat st;
+    ret = ::fstat(**fd, &st);
+    if (ret < 0) {
+      ret = -errno;
+      lfn_close(fd);
+      goto out;
+    }
 
-  // first try fallocate
-  ret = fallocate(**fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE, offset, len);
-  if (ret < 0) {
-    ret = -errno;
-  } else {
-    // ensure we extent file size, if needed
-    if (offset + len > st.st_size) {
-      ret = ::ftruncate(**fd, offset + len);
-      if (ret < 0) {
-	ret = -errno;
-	lfn_close(fd);
-	goto out;
+    // first try fallocate
+    ret = fallocate(**fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
+		    offset, len);
+    if (ret < 0) {
+      ret = -errno;
+    } else {
+      // ensure we extent file size, if needed
+      if (offset + len > st.st_size) {
+	ret = ::ftruncate(**fd, offset + len);
+	if (ret < 0) {
+	  ret = -errno;
+	  lfn_close(fd);
+	  goto out;
+	}
       }
     }
-  }
-  lfn_close(fd);
+    lfn_close(fd);
 
-  if (ret >= 0 && m_filestore_sloppy_crc) {
-    int rc = backend->_crc_update_zero(**fd, offset, len);
-    assert(rc >= 0);
-  }
+    if (ret >= 0 && m_filestore_sloppy_crc) {
+      int rc = backend->_crc_update_zero(**fd, offset, len);
+      assert(rc >= 0);
+    }
 
-  if (ret == 0)
-    goto out;  // yay!
-  if (ret != -EOPNOTSUPP)
-    goto out;  // some other error
+    if (ret == 0)
+      goto out;  // yay!
+    if (ret != -EOPNOTSUPP)
+      goto out;  // some other error
 #    endif
 # endif
 #endif
+  }
 
   // lame, kernel is old and doesn't support it.
   // write zeros.. yuck!
-  dout(20) << "zero FALLOC_FL_PUNCH_HOLE not supported, falling back to writing zeros" << dendl;
+  dout(20) << "zero falling back to writing zeros" << dendl;
   {
     bufferlist bl;
     bl.append_zero(len);