[Ocfs2-tools-devel] [PATCH 20/24] tunefs rework: Add feature_inline_data.c

[Joel Becker]

Enable and disable the inline data feature.

This is the 'inline-data' key to the tunefs option '--fs-features'.

Signed-off-by: Joel Becker <joel.becker at oracle.com>

Signed-off-by: Joel Becker <joel.becker at oracle.com>
---
 tunefs.ocfs2/feature_inline_data.c |  235 ++++++++++++++++++++++++++++++++++++
 1 files changed, 235 insertions(+), 0 deletions(-)
 create mode 100644 tunefs.ocfs2/feature_inline_data.c

diff --git a/tunefs.ocfs2/feature_inline_data.c b/tunefs.ocfs2/feature_inline_data.c
new file mode 100644
index 0000000..a95da64
--- /dev/null
+++ b/tunefs.ocfs2/feature_inline_data.c
@@ -0,0 +1,235 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * feature_inline_data.c
+ *
+ * ocfs2 tune utility for enabling and disabling the inline data feature.
+ *
+ * Copyright (C) 2008 Oracle.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <ctype.h>
+#include <inttypes.h>
+#include <assert.h>
+
+#include "ocfs2-kernel/kernel-list.h"
+#include "ocfs2/ocfs2.h"
+
+#include "libocfs2ne.h"
+
+
+/*
+ * We scan up-front to find out how many files we have to expand.  We keep
+ * track of them so that we don't have to scan again to do the work.
+ */
+struct inline_data_inode {
+	struct list_head list;
+	uint64_t blkno;
+};
+
+struct inline_data_context {
+	errcode_t ret;
+	uint32_t more_clusters;
+	struct list_head inodes;
+};
+
+
+static int enable_inline_data(ocfs2_filesys *fs, int flags)
+{
+	errcode_t ret = 0;
+	struct ocfs2_super_block *super = OCFS2_RAW_SB(fs->fs_super);
+
+	if (ocfs2_support_inline_data(super)) {
+		verbosef(VL_APP,
+			 "The inline data feature is already enabled; "
+			 "nothing to enable\n");
+		goto out;
+	}
+
+	if (!tunefs_interact("Enable the inline data feature on device "
+			     "\"%s\"? ",
+			     fs->fs_devname))
+		goto out;
+
+	OCFS2_SET_INCOMPAT_FEATURE(super,
+				   OCFS2_FEATURE_INCOMPAT_INLINE_DATA);
+	tunefs_block_signals();
+	ret = ocfs2_write_super(fs);
+	tunefs_unblock_signals();
+	if (ret)
+		tcom_err(ret, "while writing out the superblock");
+
+out:
+	return ret;
+}
+
+static errcode_t inline_iterate(ocfs2_filesys *fs, struct ocfs2_dinode *di,
+				void *user_data)
+{
+	errcode_t ret = 0;
+	struct inline_data_inode *idi = NULL;
+	struct inline_data_context *ctxt = user_data;
+
+	if (!S_ISREG(di->i_mode) && !S_ISDIR(di->i_mode))
+		goto bail;
+
+	if (!(di->i_dyn_features & OCFS2_INLINE_DATA_FL))
+		goto bail;
+
+	ret = ocfs2_malloc0(sizeof(struct inline_data_inode), &idi);
+	if (ret)
+		goto bail;
+
+	idi->blkno = di->i_blkno;
+	ctxt->more_clusters++;
+	list_add_tail(&idi->list, &ctxt->inodes);
+
+	return 0;
+
+bail:
+	return ret;
+}
+
+static errcode_t find_inline_data(ocfs2_filesys *fs,
+				  struct inline_data_context *ctxt)
+{
+	errcode_t ret;
+	uint32_t free_clusters = 0;
+
+	ret = tunefs_foreach_inode(fs, inline_iterate, ctxt);
+	if (ret)
+		goto bail;
+
+	ret = tunefs_get_free_clusters(fs, &free_clusters);
+	if (ret)
+		goto bail;
+
+	verbosef(VL_APP,
+		 "We have %u clusters free, and need %u clusters to expand "
+		 "all inline data\n",
+		 free_clusters, ctxt->more_clusters);
+
+	if (free_clusters < ctxt->more_clusters)
+		ret = OCFS2_ET_NO_SPACE;
+
+bail:
+	return ret;
+}
+
+static void empty_inline_data_context(struct inline_data_context *ctxt)
+{
+	struct list_head *pos, *n;
+	struct inline_data_inode *idi;
+
+	list_for_each_safe(pos, n, &ctxt->inodes) {
+		idi = list_entry(pos, struct inline_data_inode, list);
+		list_del(&idi->list);
+		ocfs2_free(&idi);
+	}
+}
+
+static errcode_t expand_inline_data(ocfs2_filesys *fs,
+				    struct inline_data_context *ctxt)
+{
+	errcode_t ret = 0;
+	struct list_head *pos;
+	struct inline_data_inode *idi;
+	ocfs2_cached_inode *ci = NULL;
+
+	list_for_each(pos, &ctxt->inodes) {
+		idi = list_entry(pos, struct inline_data_inode, list);
+
+		ret = ocfs2_read_cached_inode(fs, idi->blkno, &ci);
+		if (!ret) {
+			ret = ocfs2_convert_inline_data_to_extents(ci);
+			ocfs2_free_cached_inode(fs, ci);
+		}
+
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
+static int disable_inline_data(ocfs2_filesys *fs, int flags)
+{
+	errcode_t ret = 0;
+	struct ocfs2_super_block *super = OCFS2_RAW_SB(fs->fs_super);
+	struct inline_data_context ctxt;
+
+	if (!ocfs2_support_inline_data(super)) {
+		verbosef(VL_APP,
+			 "The inline data feature is not enabled; "
+			 "nothing to disable\n");
+		goto out;
+	}
+
+	if (!tunefs_interact("Disable the inline data feature on device "
+			     "\"%s\"? ",
+			     fs->fs_devname))
+		goto out;
+
+	memset(&ctxt, 0, sizeof(ctxt));
+	INIT_LIST_HEAD(&ctxt.inodes);
+	ret = find_inline_data(fs, &ctxt);
+	if (ret) {
+		if (ret == OCFS2_ET_NO_SPACE)
+			errorf("There is not enough space to expand all of "
+			       "the inline data on device \"%s\"\n",
+			       fs->fs_devname);
+		else
+			tcom_err(ret,
+				 "while trying to find files with inline data");
+		goto out_cleanup;
+	}
+
+	ret = expand_inline_data(fs, &ctxt);
+	if (ret) {
+		tcom_err(ret,
+			 "while trying to expand the inline data on device "
+			 "\"%s\"",
+			 fs->fs_devname);
+		goto out_cleanup;
+	}
+
+	OCFS2_CLEAR_INCOMPAT_FEATURE(super,
+				     OCFS2_FEATURE_INCOMPAT_INLINE_DATA);
+	tunefs_block_signals();
+	ret = ocfs2_write_super(fs);
+	tunefs_unblock_signals();
+	if (ret)
+		tcom_err(ret, "while writing out the superblock");
+
+out_cleanup:
+	empty_inline_data_context(&ctxt);
+
+out:
+	return ret;
+}
+
+DEFINE_TUNEFS_FEATURE_INCOMPAT(inline_data,
+			       OCFS2_FEATURE_INCOMPAT_INLINE_DATA,
+			       TUNEFS_FLAG_RW | TUNEFS_FLAG_ALLOCATION,
+			       enable_inline_data,
+			       disable_inline_data);
+
+#ifdef DEBUG_EXE
+int main(int argc, char *argv[])
+{
+	return tunefs_feature_main(argc, argv, &inline_data_feature);
+}
+#endif
-- 
1.5.6.3