File 0016-tunefs.ocfs2-move-o2ne_add_tailers-into-li... of Package ocfs2-tools

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File 0016-tunefs.ocfs2-move-o2ne_add_tailers-into-libocfs2ne.c.patch of Package ocfs2-tools (Revision fc8da643a748db24600590fececcd2de)

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From 2484ca19295ad347b4b6197345ac0663888361ac Mon Sep 17 00:00:00 2001
From: Mark Fasheh <mfasheh@suse.com>
Date: Mon, 19 Apr 2010 17:17:44 -0700
Subject: [PATCH 16/30] tunefs.ocfs2: move o2ne_add_tailers() into libocfs2ne.c

The prototype is already in libocfs2ne.h - this function is shared between
feature_metaecc.c and feature_indexed_dirs.c so it should be in a shared c
file as well.

Signed-off-by: Mark Fasheh <mfasheh@suse.com>
---
 tunefs.ocfs2/feature_metaecc.c |  547 ----------------------------------------
 tunefs.ocfs2/libocfs2ne.c      |  509 +++++++++++++++++++++++++++++++++++++
 tunefs.ocfs2/libocfs2ne.h      |   39 +++
 3 files changed, 548 insertions(+), 547 deletions(-)

diff --git a/tunefs.ocfs2/feature_metaecc.c b/tunefs.ocfs2/feature_metaecc.c
index e6b48b5..c9c2709 100644
--- a/tunefs.ocfs2/feature_metaecc.c
+++ b/tunefs.ocfs2/feature_metaecc.c
@@ -33,553 +33,6 @@
 
 
 
-/* A dirblock we have to add a trailer to */
-struct tunefs_trailer_dirblock {
-	struct list_head db_list;
-	uint64_t db_blkno;
-	char *db_buf;
-
-	/*
-	 * These require a little explanation.  They point to
-	 * ocfs2_dir_entry structures inside db_buf.
-	 *
-	 * db_last entry we're going to *keep*.  If the last entry in the
-	 * dirblock has enough extra rec_len to allow the trailer, db_last
-	 * points to it.  We will shorten its rec_len and insert the
-	 * trailer.
-	 *
-	 * However, if the last entry in the dirblock cannot be truncated,
-	 * db_move points to the entry we have to move out, and db_last
-	 * points to the entry before that - the last entry we're keeping
-	 * in this dirblock.
-	 *
-	 * Examples:
-	 *
-	 * - The last entry in the dirblock has a name_len of 1 and a
-	 *   rec_len of 128.  We can easily change the rec_len to 64 and
-	 *   insert the trailer.  db_last points to this entry.
-	 *
-	 * - The last entry in the dirblock has a name_len of 1 and a
-	 *   rec_len of 48.  The previous entry has a name_len of 1 and a
-	 *   rec_len of 32.  We have to move the last entry out.  The
-	 *   second-to-last entry can have its rec_len truncated to 16, so
-	 *   we put it in db_last.
-	 */
-	struct ocfs2_dir_entry *db_last;
-};
-
-static void tunefs_trailer_context_free(struct tunefs_trailer_context *tc)
-{
-	struct tunefs_trailer_dirblock *db;
-	struct list_head *n, *pos;
-
-	if (!list_empty(&tc->d_list))
-		list_del(&tc->d_list);
-
-	list_for_each_safe(pos, n, &tc->d_dirblocks) {
-		db = list_entry(pos, struct tunefs_trailer_dirblock, db_list);
-		list_del(&db->db_list);
-		ocfs2_free(&db->db_buf);
-		ocfs2_free(&db);
-	}
-
-	ocfs2_free(&tc);
-}
-
-/*
- * We're calculating how many bytes we need to add to make space for
- * the dir trailers.  But we need to make sure that the added directory
- * blocks also have room for a trailer.
- */
-static void add_bytes_needed(ocfs2_filesys *fs,
-			     struct tunefs_trailer_context *tc,
-			     unsigned int rec_len)
-{
-	unsigned int toff = ocfs2_dir_trailer_blk_off(fs);
-	unsigned int block_offset = tc->d_bytes_needed % fs->fs_blocksize;
-
-	/*
-	 * If the current byte offset would put us into a trailer, push
-	 * it out to the start of the next block.  Remember, dirents have
-	 * to be at least 16 bytes, which is why we check against the
-	 * smallest rec_len.
-	 */
-	if ((block_offset + rec_len) > (toff - OCFS2_DIR_REC_LEN(1)))
-		tc->d_bytes_needed += fs->fs_blocksize - block_offset;
-
-	tc->d_bytes_needed += rec_len;
-	tc->d_blocks_needed =
-		ocfs2_blocks_in_bytes(fs, tc->d_bytes_needed);
-}
-
-static errcode_t walk_dirblock(ocfs2_filesys *fs,
-			       struct tunefs_trailer_context *tc,
-			       struct tunefs_trailer_dirblock *db)
-{
-	errcode_t ret = 0;
-	struct ocfs2_dir_entry *dirent, *prev = NULL;
-	unsigned int real_rec_len;
-	unsigned int offset = 0;
-	unsigned int toff = ocfs2_dir_trailer_blk_off(fs);
-
-	while (offset < fs->fs_blocksize) {
-		dirent = (struct ocfs2_dir_entry *) (db->db_buf + offset);
-		if (((offset + dirent->rec_len) > fs->fs_blocksize) ||
-		    (dirent->rec_len < 8) ||
-		    ((dirent->rec_len % 4) != 0) ||
-		    (((dirent->name_len & 0xFF)+8) > dirent->rec_len)) {
-			ret = OCFS2_ET_DIR_CORRUPTED;
-			break;
-		}
-
-		real_rec_len = dirent->inode ?
-			OCFS2_DIR_REC_LEN(dirent->name_len) :
-			OCFS2_DIR_REC_LEN(1);
-		if ((offset + real_rec_len) <= toff)
-			goto next;
-
-		/*
-		 * The first time through, we store off the last dirent
-		 * before the trailer.
-		 */
-		if (!db->db_last)
-			db->db_last = prev;
-
-		/* Only live dirents need to be moved */
-		if (dirent->inode) {
-			verbosef(VL_DEBUG,
-				 "Will move dirent %.*s out of "
-				 "directory block %"PRIu64" to make way "
-				 "for the trailer\n",
-				 dirent->name_len, dirent->name,
-				 db->db_blkno);
-			add_bytes_needed(fs, tc, real_rec_len);
-		}
-
-next:
-		prev = dirent;
-		offset += dirent->rec_len;
-	}
-
-	/* There were no dirents across the boundary */
-	if (!db->db_last)
-		db->db_last = prev;
-
-	return ret;
-}
-
-static int dirblock_scan_iterate(ocfs2_filesys *fs, uint64_t blkno,
-				 uint64_t bcount, uint16_t ext_flags,
-				 void *priv_data)
-{
-	errcode_t ret = 0;
-	struct tunefs_trailer_dirblock *db = NULL;
-	struct tunefs_trailer_context *tc = priv_data;
-
-	ret = ocfs2_malloc0(sizeof(struct tunefs_trailer_dirblock), &db);
-	if (ret)
-		goto out;
-
-	ret = ocfs2_malloc_block(fs->fs_io, &db->db_buf);
-	if (ret)
-		goto out;
-
-	db->db_blkno = blkno;
-
-	verbosef(VL_DEBUG,
-		 "Reading dinode %"PRIu64" dirblock %"PRIu64" at block "
-		 "%"PRIu64"\n",
-		 tc->d_di->i_blkno, bcount, blkno);
-	ret = ocfs2_read_dir_block(fs, tc->d_di, blkno, db->db_buf);
-	if (ret)
-		goto out;
-
-	ret = walk_dirblock(fs, tc, db);
-	if (ret)
-		goto out;
-
-	list_add_tail(&db->db_list, &tc->d_dirblocks);
-	db = NULL;
-
-out:
-	if (db) {
-		if (db->db_buf)
-			ocfs2_free(&db->db_buf);
-		ocfs2_free(&db);
-	}
-
-	if (ret) {
-		tc->d_err = ret;
-		return OCFS2_BLOCK_ABORT;
-	}
-
-	return 0;
-}
-
-static errcode_t tunefs_prepare_dir_trailer(ocfs2_filesys *fs,
-					    struct ocfs2_dinode *di,
-					    struct tunefs_trailer_context **tc_ret)
-{
-	errcode_t ret = 0;
-	struct tunefs_trailer_context *tc = NULL;
-
-	if (ocfs2_dir_has_trailer(fs, di))
-		goto out;
-
-	ret = ocfs2_malloc0(sizeof(struct tunefs_trailer_context), &tc);
-	if (ret)
-		goto out;
-
-	tc->d_blkno = di->i_blkno;
-	tc->d_di = di;
-	INIT_LIST_HEAD(&tc->d_list);
-	INIT_LIST_HEAD(&tc->d_dirblocks);
-
-	ret = ocfs2_block_iterate_inode(fs, tc->d_di, 0,
-					dirblock_scan_iterate, tc);
-	if (!ret)
-		ret = tc->d_err;
-	if (ret)
-		goto out;
-
-	*tc_ret = tc;
-	tc = NULL;
-
-out:
-	if (tc)
-		tunefs_trailer_context_free(tc);
-
-	return ret;
-}
-
-/*
- * We are hand-coding the directory expansion because we're going to
- * build the new directory blocks ourselves.  We can't just use
- * ocfs2_expand_dir() and ocfs2_link(), because we're moving around
- * entries.
- */
-static errcode_t expand_dir_if_needed(ocfs2_filesys *fs,
-				      struct ocfs2_dinode *di,
-				      uint64_t blocks_needed)
-{
-	errcode_t ret = 0;
-	uint64_t used_blocks, total_blocks;
-	uint32_t clusters_needed;
-
-	/* This relies on the fact that i_size of a directory is a
-	 * multiple of blocksize */
-	used_blocks = ocfs2_blocks_in_bytes(fs, di->i_size);
-	total_blocks = ocfs2_clusters_to_blocks(fs, di->i_clusters);
-	if ((used_blocks + blocks_needed) <= total_blocks)
-		goto out;
-
-	clusters_needed =
-		ocfs2_clusters_in_blocks(fs,
-					 (used_blocks + blocks_needed) -
-					 total_blocks);
-	ret = ocfs2_extend_allocation(fs, di->i_blkno, clusters_needed);
-	if (ret)
-		goto out;
-
-	/* Pick up changes to the inode */
-	ret = ocfs2_read_inode(fs, di->i_blkno, (char *)di);
-
-out:
-	return ret;
-}
-
-static void shift_dirent(ocfs2_filesys *fs,
-			 struct tunefs_trailer_context *tc,
-			 struct ocfs2_dir_entry *dirent)
-{
-	/* Using the real rec_len */
-	unsigned int rec_len = OCFS2_DIR_REC_LEN(dirent->name_len);
-	unsigned int offset, remain;
-
-	/*
-	 * If the current byte offset would put us into a trailer, push
-	 * it out to the start of the next block.  Remember, dirents have
-	 * to be at least 16 bytes, which is why we check against the
-	 * smallest rec_len.
-	 */
-	if (rec_len > (tc->d_next_dirent->rec_len - OCFS2_DIR_REC_LEN(1))) {
-		tc->d_cur_block += fs->fs_blocksize;
-		tc->d_next_dirent = (struct ocfs2_dir_entry *)tc->d_cur_block;
-	}
-
-	assert(ocfs2_blocks_in_bytes(fs,
-				     tc->d_cur_block - tc->d_new_blocks) <
-	       tc->d_blocks_needed);
-
-	offset = (char *)(tc->d_next_dirent) - tc->d_cur_block;
-	remain = tc->d_next_dirent->rec_len - rec_len;
-
-	memcpy(tc->d_cur_block + offset, dirent, rec_len);
-	tc->d_next_dirent->rec_len = rec_len;
-
-	verbosef(VL_DEBUG,
-		 "Installed dirent %.*s at offset %u of new block "
-		 "%"PRIu64", rec_len %u\n",
-		 tc->d_next_dirent->name_len, tc->d_next_dirent->name,
-		 offset,
-		 ocfs2_blocks_in_bytes(fs, tc->d_cur_block - tc->d_new_blocks),
-		 rec_len);
-
-
-	offset += rec_len;
-	tc->d_next_dirent =
-		(struct ocfs2_dir_entry *)(tc->d_cur_block + offset);
-	tc->d_next_dirent->rec_len = remain;
-
-	verbosef(VL_DEBUG,
-		 "New block %"PRIu64" has its last dirent at %u, with %u "
-		 "bytes left\n",
-		 ocfs2_blocks_in_bytes(fs, tc->d_cur_block - tc->d_new_blocks),
-		 offset, remain);
-}
-
-static errcode_t fixup_dirblock(ocfs2_filesys *fs,
-				struct tunefs_trailer_context *tc,
-				struct tunefs_trailer_dirblock *db)
-{
-	errcode_t ret = 0;
-	struct ocfs2_dir_entry *dirent;
-	unsigned int real_rec_len;
-	unsigned int offset;
-	unsigned int toff = ocfs2_dir_trailer_blk_off(fs);
-
-	/*
-	 * db_last is the last dirent we're *keeping*.  So we need to 
-	 * move out every valid dirent *after* db_last.
-	 *
-	 * tunefs_prepare_dir_trailer() should have calculated this
-	 * correctly.
-	 */
-	offset = ((char *)db->db_last) - db->db_buf;
-	offset += db->db_last->rec_len;
-	while (offset < fs->fs_blocksize) {
-		dirent = (struct ocfs2_dir_entry *) (db->db_buf + offset);
-		if (((offset + dirent->rec_len) > fs->fs_blocksize) ||
-		    (dirent->rec_len < 8) ||
-		    ((dirent->rec_len % 4) != 0) ||
-		    (((dirent->name_len & 0xFF)+8) > dirent->rec_len)) {
-			ret = OCFS2_ET_DIR_CORRUPTED;
-			break;
-		}
-
-		real_rec_len = dirent->inode ?
-			OCFS2_DIR_REC_LEN(dirent->name_len) :
-			OCFS2_DIR_REC_LEN(1);
-
-		assert((offset + real_rec_len) > toff);
-
-		/* Only live dirents need to be moved */
-		if (dirent->inode) {
-			verbosef(VL_DEBUG,
-				 "Moving dirent %.*s out of directory "
-				 "block %"PRIu64" to make way for the "
-				 "trailer\n",
-				 dirent->name_len, dirent->name,
-				 db->db_blkno);
-			shift_dirent(fs, tc, dirent);
-		}
-
-		offset += dirent->rec_len;
-	}
-
-	/*
-	 * Now that we've moved any dirents out of the way, we need to
-	 * fix up db_last and install the trailer.
-	 */
-	offset = ((char *)db->db_last) - db->db_buf;
-	verbosef(VL_DEBUG,
-		 "Last valid dirent of directory block %"PRIu64" "
-		 "(\"%.*s\") is %u bytes in.  Setting rec_len to %u and "
-		 "installing the trailer\n",
-		 db->db_blkno, db->db_last->name_len, db->db_last->name,
-		 offset, toff - offset);
-	db->db_last->rec_len = toff - offset;
-	ocfs2_init_dir_trailer(fs, tc->d_di, db->db_blkno, db->db_buf);
-
-	return ret;
-}
-
-static errcode_t run_dirblocks(ocfs2_filesys *fs,
-			       struct tunefs_trailer_context *tc)
-{
-	errcode_t ret = 0;
-	struct list_head *pos;
-	struct tunefs_trailer_dirblock *db;
-
-	list_for_each(pos, &tc->d_dirblocks) {
-		db = list_entry(pos, struct tunefs_trailer_dirblock, db_list);
-		ret = fixup_dirblock(fs, tc, db);
-		if (ret)
-			break;
-	}
-
-	return ret;
-}
-
-static errcode_t write_dirblocks(ocfs2_filesys *fs,
-				 struct tunefs_trailer_context *tc)
-{
-	errcode_t ret = 0;
-	struct list_head *pos;
-	struct tunefs_trailer_dirblock *db;
-
-	list_for_each(pos, &tc->d_dirblocks) {
-		db = list_entry(pos, struct tunefs_trailer_dirblock, db_list);
-		ret = ocfs2_write_dir_block(fs, tc->d_di, db->db_blkno,
-					    db->db_buf);
-		if (ret) {
-			verbosef(VL_DEBUG,
-				 "Error writing dirblock %"PRIu64"\n",
-				 db->db_blkno);
-			break;
-		}
-	}
-
-	return ret;
-}
-
-static errcode_t init_new_dirblocks(ocfs2_filesys *fs,
-				    struct tunefs_trailer_context *tc)
-{
-	int i;
-	errcode_t ret;
-	uint64_t blkno;
-	uint64_t orig_block = ocfs2_blocks_in_bytes(fs, tc->d_di->i_size);
-	ocfs2_cached_inode *cinode;
-	char *blockptr;
-	struct ocfs2_dir_entry *first;
-
-	ret = ocfs2_read_cached_inode(fs, tc->d_blkno, &cinode);
-	if (ret)
-		goto out;
-	assert(!memcmp(tc->d_di, cinode->ci_inode, fs->fs_blocksize));
-
-	for (i = 0; i < tc->d_blocks_needed; i++) {
-		ret = ocfs2_extent_map_get_blocks(cinode, orig_block + i,
-						  1, &blkno, NULL, NULL);
-		if (ret)
-			goto out;
-		blockptr = tc->d_new_blocks + (i * fs->fs_blocksize);
-		memset(blockptr, 0, fs->fs_blocksize);
-		first = (struct ocfs2_dir_entry *)blockptr;
-		first->rec_len = ocfs2_dir_trailer_blk_off(fs);
-		ocfs2_init_dir_trailer(fs, tc->d_di, blkno, blockptr);
-	}
-
-out:
-	return ret;
-}
-
-static errcode_t write_new_dirblocks(ocfs2_filesys *fs,
-				     struct tunefs_trailer_context *tc)
-{
-	int i;
-	errcode_t ret;
-	uint64_t blkno;
-	uint64_t orig_block = ocfs2_blocks_in_bytes(fs, tc->d_di->i_size);
-	ocfs2_cached_inode *cinode;
-	char *blockptr;
-
-	ret = ocfs2_read_cached_inode(fs, tc->d_blkno, &cinode);
-	if (ret)
-		goto out;
-	assert(!memcmp(tc->d_di, cinode->ci_inode, fs->fs_blocksize));
-
-	for (i = 0; i < tc->d_blocks_needed; i++) {
-		ret = ocfs2_extent_map_get_blocks(cinode, orig_block + i,
-						  1, &blkno, NULL, NULL);
-		if (ret)
-			goto out;
-		blockptr = tc->d_new_blocks + (i * fs->fs_blocksize);
-		ret = ocfs2_write_dir_block(fs, tc->d_di, blkno, blockptr);
-		if (ret) {
-			verbosef(VL_DEBUG,
-				 "Error writing dirblock %"PRIu64"\n",
-				 blkno);
-			goto out;
-		}
-	}
-
-out:
-	return ret;
-}
-
-
-errcode_t tunefs_install_dir_trailer(ocfs2_filesys *fs,
-					struct ocfs2_dinode *di,
-					struct tunefs_trailer_context *tc)
-{
-	errcode_t ret = 0;
-	struct tunefs_trailer_context *our_tc = NULL;
-
-	if (!tc) {
-		ret = tunefs_prepare_dir_trailer(fs, di, &our_tc);
-		if (ret)
-			goto out;
-		tc = our_tc;
-	}
-
-	if (tc->d_di != di) {
-		ret = OCFS2_ET_INVALID_ARGUMENT;
-		goto out;
-	}
-
-	if (tc->d_blocks_needed) {
-		ret = ocfs2_malloc_blocks(fs->fs_io, tc->d_blocks_needed,
-					  &tc->d_new_blocks);
-		if (ret)
-			goto out;
-
-		tc->d_cur_block = tc->d_new_blocks;
-
-		ret = expand_dir_if_needed(fs, di, tc->d_blocks_needed);
-		if (ret)
-			goto out;
-
-		ret = init_new_dirblocks(fs, tc);
-		if (ret)
-			goto out;
-		tc->d_next_dirent = (struct ocfs2_dir_entry *)tc->d_cur_block;
-		verbosef(VL_DEBUG, "t_next_dirent has rec_len of %u\n",
-			 tc->d_next_dirent->rec_len);
-	}
-
-	ret = run_dirblocks(fs, tc);
-	if (ret)
-		goto out;
-
-	/*
-	 * We write in a specific order.  We write any new dirblocks first
-	 * so that they are on disk.  Then we write the new i_size in the
-	 * inode.  If we crash at this point, the directory has duplicate
-	 * entries but no lost entries.  fsck can clean it up.  Finally, we
-	 * write the modified dirblocks with trailers.
-	 */
-	if (tc->d_blocks_needed) {
-		ret = write_new_dirblocks(fs, tc);
-		if (ret)
-			goto out;
-
-		di->i_size += ocfs2_blocks_to_bytes(fs, tc->d_blocks_needed);
-		ret = ocfs2_write_inode(fs, di->i_blkno, (char *)di);
-		if (ret)
-			goto out;
-	}
-
-	ret = write_dirblocks(fs, tc);
-
-out:
-	if (our_tc)
-		tunefs_trailer_context_free(our_tc);
-	return ret;
-}
-
-
 /*
  * Since we have to scan the inodes in our first pass to find directories
  * that need trailers, we might as well store them off and avoid reading
diff --git a/tunefs.ocfs2/libocfs2ne.c b/tunefs.ocfs2/libocfs2ne.c
index 174fef0..824214b 100644
--- a/tunefs.ocfs2/libocfs2ne.c
+++ b/tunefs.ocfs2/libocfs2ne.c
@@ -577,6 +577,515 @@ out:
 	return ret;
 }
 
+void tunefs_trailer_context_free(struct tunefs_trailer_context *tc)
+{
+	struct tunefs_trailer_dirblock *db;
+	struct list_head *n, *pos;
+
+	if (!list_empty(&tc->d_list))
+		list_del(&tc->d_list);
+
+	list_for_each_safe(pos, n, &tc->d_dirblocks) {
+		db = list_entry(pos, struct tunefs_trailer_dirblock, db_list);
+		list_del(&db->db_list);
+		ocfs2_free(&db->db_buf);
+		ocfs2_free(&db);
+	}
+
+	ocfs2_free(&tc);
+}
+
+/*
+ * We're calculating how many bytes we need to add to make space for
+ * the dir trailers.  But we need to make sure that the added directory
+ * blocks also have room for a trailer.
+ */
+static void add_bytes_needed(ocfs2_filesys *fs,
+			     struct tunefs_trailer_context *tc,
+			     unsigned int rec_len)
+{
+	unsigned int toff = ocfs2_dir_trailer_blk_off(fs);
+	unsigned int block_offset = tc->d_bytes_needed % fs->fs_blocksize;
+
+	/*
+	 * If the current byte offset would put us into a trailer, push
+	 * it out to the start of the next block.  Remember, dirents have
+	 * to be at least 16 bytes, which is why we check against the
+	 * smallest rec_len.
+	 */
+	if ((block_offset + rec_len) > (toff - OCFS2_DIR_REC_LEN(1)))
+		tc->d_bytes_needed += fs->fs_blocksize - block_offset;
+
+	tc->d_bytes_needed += rec_len;
+	tc->d_blocks_needed =
+		ocfs2_blocks_in_bytes(fs, tc->d_bytes_needed);
+}
+
+static errcode_t walk_dirblock(ocfs2_filesys *fs,
+			       struct tunefs_trailer_context *tc,
+			       struct tunefs_trailer_dirblock *db)
+{
+	errcode_t ret = 0;
+	struct ocfs2_dir_entry *dirent, *prev = NULL;
+	unsigned int real_rec_len;
+	unsigned int offset = 0;
+	unsigned int toff = ocfs2_dir_trailer_blk_off(fs);
+
+	while (offset < fs->fs_blocksize) {
+		dirent = (struct ocfs2_dir_entry *) (db->db_buf + offset);
+		if (((offset + dirent->rec_len) > fs->fs_blocksize) ||
+		    (dirent->rec_len < 8) ||
+		    ((dirent->rec_len % 4) != 0) ||
+		    (((dirent->name_len & 0xFF)+8) > dirent->rec_len)) {
+			ret = OCFS2_ET_DIR_CORRUPTED;
+			break;
+		}
+
+		real_rec_len = dirent->inode ?
+			OCFS2_DIR_REC_LEN(dirent->name_len) :
+			OCFS2_DIR_REC_LEN(1);
+		if ((offset + real_rec_len) <= toff)
+			goto next;
+
+		/*
+		 * The first time through, we store off the last dirent
+		 * before the trailer.
+		 */
+		if (!db->db_last)
+			db->db_last = prev;
+
+		/* Only live dirents need to be moved */
+		if (dirent->inode) {
+			verbosef(VL_DEBUG,
+				 "Will move dirent %.*s out of "
+				 "directory block %"PRIu64" to make way "
+				 "for the trailer\n",
+				 dirent->name_len, dirent->name,
+				 db->db_blkno);
+			add_bytes_needed(fs, tc, real_rec_len);
+		}
+
+next:
+		prev = dirent;
+		offset += dirent->rec_len;
+	}
+
+	/* There were no dirents across the boundary */
+	if (!db->db_last)
+		db->db_last = prev;
+
+	return ret;
+}
+
+static int dirblock_scan_iterate(ocfs2_filesys *fs, uint64_t blkno,
+				 uint64_t bcount, uint16_t ext_flags,
+				 void *priv_data)
+{
+	errcode_t ret = 0;
+	struct tunefs_trailer_dirblock *db = NULL;
+	struct tunefs_trailer_context *tc = priv_data;
+
+	ret = ocfs2_malloc0(sizeof(struct tunefs_trailer_dirblock), &db);
+	if (ret)
+		goto out;
+
+	ret = ocfs2_malloc_block(fs->fs_io, &db->db_buf);
+	if (ret)
+		goto out;
+
+	db->db_blkno = blkno;
+
+	verbosef(VL_DEBUG,
+		 "Reading dinode %"PRIu64" dirblock %"PRIu64" at block "
+		 "%"PRIu64"\n",
+		 tc->d_di->i_blkno, bcount, blkno);
+	ret = ocfs2_read_dir_block(fs, tc->d_di, blkno, db->db_buf);
+	if (ret)
+		goto out;
+
+	ret = walk_dirblock(fs, tc, db);
+	if (ret)
+		goto out;
+
+	list_add_tail(&db->db_list, &tc->d_dirblocks);
+	db = NULL;
+
+out:
+	if (db) {
+		if (db->db_buf)
+			ocfs2_free(&db->db_buf);
+		ocfs2_free(&db);
+	}
+
+	if (ret) {
+		tc->d_err = ret;
+		return OCFS2_BLOCK_ABORT;
+	}
+
+	return 0;
+}
+
+errcode_t tunefs_prepare_dir_trailer(ocfs2_filesys *fs,
+				     struct ocfs2_dinode *di,
+				     struct tunefs_trailer_context **tc_ret)
+{
+	errcode_t ret = 0;
+	struct tunefs_trailer_context *tc = NULL;
+
+	if (ocfs2_dir_has_trailer(fs, di))
+		goto out;
+
+	ret = ocfs2_malloc0(sizeof(struct tunefs_trailer_context), &tc);
+	if (ret)
+		goto out;
+
+	tc->d_blkno = di->i_blkno;
+	tc->d_di = di;
+	INIT_LIST_HEAD(&tc->d_list);
+	INIT_LIST_HEAD(&tc->d_dirblocks);
+
+	ret = ocfs2_block_iterate_inode(fs, tc->d_di, 0,
+					dirblock_scan_iterate, tc);
+	if (!ret)
+		ret = tc->d_err;
+	if (ret)
+		goto out;
+
+	*tc_ret = tc;
+	tc = NULL;
+
+out:
+	if (tc)
+		tunefs_trailer_context_free(tc);
+
+	return ret;
+}
+
+/*
+ * We are hand-coding the directory expansion because we're going to
+ * build the new directory blocks ourselves.  We can't just use
+ * ocfs2_expand_dir() and ocfs2_link(), because we're moving around
+ * entries.
+ */
+static errcode_t expand_dir_if_needed(ocfs2_filesys *fs,
+				      struct ocfs2_dinode *di,
+				      uint64_t blocks_needed)
+{
+	errcode_t ret = 0;
+	uint64_t used_blocks, total_blocks;
+	uint32_t clusters_needed;
+
+	/* This relies on the fact that i_size of a directory is a
+	 * multiple of blocksize */
+	used_blocks = ocfs2_blocks_in_bytes(fs, di->i_size);
+	total_blocks = ocfs2_clusters_to_blocks(fs, di->i_clusters);
+	if ((used_blocks + blocks_needed) <= total_blocks)
+		goto out;
+
+	clusters_needed =
+		ocfs2_clusters_in_blocks(fs,
+					 (used_blocks + blocks_needed) -
+					 total_blocks);
+	ret = ocfs2_extend_allocation(fs, di->i_blkno, clusters_needed);
+	if (ret)
+		goto out;
+
+	/* Pick up changes to the inode */
+	ret = ocfs2_read_inode(fs, di->i_blkno, (char *)di);
+
+out:
+	return ret;
+}
+
+static void shift_dirent(ocfs2_filesys *fs,
+			 struct tunefs_trailer_context *tc,
+			 struct ocfs2_dir_entry *dirent)
+{
+	/* Using the real rec_len */
+	unsigned int rec_len = OCFS2_DIR_REC_LEN(dirent->name_len);
+	unsigned int offset, remain;
+
+	/*
+	 * If the current byte offset would put us into a trailer, push
+	 * it out to the start of the next block.  Remember, dirents have
+	 * to be at least 16 bytes, which is why we check against the
+	 * smallest rec_len.
+	 */
+	if (rec_len > (tc->d_next_dirent->rec_len - OCFS2_DIR_REC_LEN(1))) {
+		tc->d_cur_block += fs->fs_blocksize;
+		tc->d_next_dirent = (struct ocfs2_dir_entry *)tc->d_cur_block;
+	}
+
+	assert(ocfs2_blocks_in_bytes(fs,
+				     tc->d_cur_block - tc->d_new_blocks) <
+	       tc->d_blocks_needed);
+
+	offset = (char *)(tc->d_next_dirent) - tc->d_cur_block;
+	remain = tc->d_next_dirent->rec_len - rec_len;
+
+	memcpy(tc->d_cur_block + offset, dirent, rec_len);
+	tc->d_next_dirent->rec_len = rec_len;
+
+	verbosef(VL_DEBUG,
+		 "Installed dirent %.*s at offset %u of new block "
+		 "%"PRIu64", rec_len %u\n",
+		 tc->d_next_dirent->name_len, tc->d_next_dirent->name,
+		 offset,
+		 ocfs2_blocks_in_bytes(fs, tc->d_cur_block - tc->d_new_blocks),
+		 rec_len);
+
+
+	offset += rec_len;
+	tc->d_next_dirent =
+		(struct ocfs2_dir_entry *)(tc->d_cur_block + offset);
+	tc->d_next_dirent->rec_len = remain;
+
+	verbosef(VL_DEBUG,
+		 "New block %"PRIu64" has its last dirent at %u, with %u "
+		 "bytes left\n",
+		 ocfs2_blocks_in_bytes(fs, tc->d_cur_block - tc->d_new_blocks),
+		 offset, remain);
+}
+
+static errcode_t fixup_dirblock(ocfs2_filesys *fs,
+				struct tunefs_trailer_context *tc,
+				struct tunefs_trailer_dirblock *db)
+{
+	errcode_t ret = 0;
+	struct ocfs2_dir_entry *dirent;
+	unsigned int real_rec_len;
+	unsigned int offset;
+	unsigned int toff = ocfs2_dir_trailer_blk_off(fs);
+
+	/*
+	 * db_last is the last dirent we're *keeping*.  So we need to 
+	 * move out every valid dirent *after* db_last.
+	 *
+	 * tunefs_prepare_dir_trailer() should have calculated this
+	 * correctly.
+	 */
+	offset = ((char *)db->db_last) - db->db_buf;
+	offset += db->db_last->rec_len;
+	while (offset < fs->fs_blocksize) {
+		dirent = (struct ocfs2_dir_entry *) (db->db_buf + offset);
+		if (((offset + dirent->rec_len) > fs->fs_blocksize) ||
+		    (dirent->rec_len < 8) ||
+		    ((dirent->rec_len % 4) != 0) ||
+		    (((dirent->name_len & 0xFF)+8) > dirent->rec_len)) {
+			ret = OCFS2_ET_DIR_CORRUPTED;
+			break;
+		}
+
+		real_rec_len = dirent->inode ?
+			OCFS2_DIR_REC_LEN(dirent->name_len) :
+			OCFS2_DIR_REC_LEN(1);
+
+		assert((offset + real_rec_len) > toff);
+
+		/* Only live dirents need to be moved */
+		if (dirent->inode) {
+			verbosef(VL_DEBUG,
+				 "Moving dirent %.*s out of directory "
+				 "block %"PRIu64" to make way for the "
+				 "trailer\n",
+				 dirent->name_len, dirent->name,
+				 db->db_blkno);
+			shift_dirent(fs, tc, dirent);
+		}
+
+		offset += dirent->rec_len;
+	}
+
+	/*
+	 * Now that we've moved any dirents out of the way, we need to
+	 * fix up db_last and install the trailer.
+	 */
+	offset = ((char *)db->db_last) - db->db_buf;
+	verbosef(VL_DEBUG,
+		 "Last valid dirent of directory block %"PRIu64" "
+		 "(\"%.*s\") is %u bytes in.  Setting rec_len to %u and "
+		 "installing the trailer\n",
+		 db->db_blkno, db->db_last->name_len, db->db_last->name,
+		 offset, toff - offset);
+	db->db_last->rec_len = toff - offset;
+	ocfs2_init_dir_trailer(fs, tc->d_di, db->db_blkno, db->db_buf);
+
+	return ret;
+}
+
+static errcode_t run_dirblocks(ocfs2_filesys *fs,
+			       struct tunefs_trailer_context *tc)
+{
+	errcode_t ret = 0;
+	struct list_head *pos;
+	struct tunefs_trailer_dirblock *db;
+
+	list_for_each(pos, &tc->d_dirblocks) {
+		db = list_entry(pos, struct tunefs_trailer_dirblock, db_list);
+		ret = fixup_dirblock(fs, tc, db);
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
+static errcode_t write_dirblocks(ocfs2_filesys *fs,
+				 struct tunefs_trailer_context *tc)
+{
+	errcode_t ret = 0;
+	struct list_head *pos;
+	struct tunefs_trailer_dirblock *db;
+
+	list_for_each(pos, &tc->d_dirblocks) {
+		db = list_entry(pos, struct tunefs_trailer_dirblock, db_list);
+		ret = ocfs2_write_dir_block(fs, tc->d_di, db->db_blkno,
+					    db->db_buf);
+		if (ret) {
+			verbosef(VL_DEBUG,
+				 "Error writing dirblock %"PRIu64"\n",
+				 db->db_blkno);
+			break;
+		}
+	}
+
+	return ret;
+}
+
+static errcode_t init_new_dirblocks(ocfs2_filesys *fs,
+				    struct tunefs_trailer_context *tc)
+{
+	int i;
+	errcode_t ret;
+	uint64_t blkno;
+	uint64_t orig_block = ocfs2_blocks_in_bytes(fs, tc->d_di->i_size);
+	ocfs2_cached_inode *cinode;
+	char *blockptr;
+	struct ocfs2_dir_entry *first;
+
+	ret = ocfs2_read_cached_inode(fs, tc->d_blkno, &cinode);
+	if (ret)
+		goto out;
+	assert(!memcmp(tc->d_di, cinode->ci_inode, fs->fs_blocksize));
+
+	for (i = 0; i < tc->d_blocks_needed; i++) {
+		ret = ocfs2_extent_map_get_blocks(cinode, orig_block + i,
+						  1, &blkno, NULL, NULL);
+		if (ret)
+			goto out;
+		blockptr = tc->d_new_blocks + (i * fs->fs_blocksize);
+		memset(blockptr, 0, fs->fs_blocksize);
+		first = (struct ocfs2_dir_entry *)blockptr;
+		first->rec_len = ocfs2_dir_trailer_blk_off(fs);
+		ocfs2_init_dir_trailer(fs, tc->d_di, blkno, blockptr);
+	}
+
+out:
+	return ret;
+}
+
+static errcode_t write_new_dirblocks(ocfs2_filesys *fs,
+				     struct tunefs_trailer_context *tc)
+{
+	int i;
+	errcode_t ret;
+	uint64_t blkno;
+	uint64_t orig_block = ocfs2_blocks_in_bytes(fs, tc->d_di->i_size);
+	ocfs2_cached_inode *cinode;
+	char *blockptr;
+
+	ret = ocfs2_read_cached_inode(fs, tc->d_blkno, &cinode);
+	if (ret)
+		goto out;
+	assert(!memcmp(tc->d_di, cinode->ci_inode, fs->fs_blocksize));
+
+	for (i = 0; i < tc->d_blocks_needed; i++) {
+		ret = ocfs2_extent_map_get_blocks(cinode, orig_block + i,
+						  1, &blkno, NULL, NULL);
+		if (ret)
+			goto out;
+		blockptr = tc->d_new_blocks + (i * fs->fs_blocksize);
+		ret = ocfs2_write_dir_block(fs, tc->d_di, blkno, blockptr);
+		if (ret) {
+			verbosef(VL_DEBUG,
+				 "Error writing dirblock %"PRIu64"\n",
+				 blkno);
+			goto out;
+		}
+	}
+
+out:
+	return ret;
+}
+
+errcode_t tunefs_install_dir_trailer(ocfs2_filesys *fs,
+					struct ocfs2_dinode *di,
+					struct tunefs_trailer_context *tc)
+{
+	errcode_t ret = 0;
+	struct tunefs_trailer_context *our_tc = NULL;
+
+	if (!tc) {
+		ret = tunefs_prepare_dir_trailer(fs, di, &our_tc);
+		if (ret)
+			goto out;
+		tc = our_tc;
+	}
+
+	if (tc->d_di != di) {
+		ret = OCFS2_ET_INVALID_ARGUMENT;
+		goto out;
+	}
+
+	if (tc->d_blocks_needed) {
+		ret = ocfs2_malloc_blocks(fs->fs_io, tc->d_blocks_needed,
+					  &tc->d_new_blocks);
+		if (ret)
+			goto out;
+
+		tc->d_cur_block = tc->d_new_blocks;
+
+		ret = expand_dir_if_needed(fs, di, tc->d_blocks_needed);
+		if (ret)
+			goto out;
+
+		ret = init_new_dirblocks(fs, tc);
+		if (ret)
+			goto out;
+		tc->d_next_dirent = (struct ocfs2_dir_entry *)tc->d_cur_block;
+		verbosef(VL_DEBUG, "t_next_dirent has rec_len of %u\n",
+			 tc->d_next_dirent->rec_len);
+	}
+
+	ret = run_dirblocks(fs, tc);
+	if (ret)
+		goto out;
+
+	/*
+	 * We write in a specific order.  We write any new dirblocks first
+	 * so that they are on disk.  Then we write the new i_size in the
+	 * inode.  If we crash at this point, the directory has duplicate
+	 * entries but no lost entries.  fsck can clean it up.  Finally, we
+	 * write the modified dirblocks with trailers.
+	 */
+	if (tc->d_blocks_needed) {
+		ret = write_new_dirblocks(fs, tc);
+		if (ret)
+			goto out;
+
+		di->i_size += ocfs2_blocks_to_bytes(fs, tc->d_blocks_needed);
+		ret = ocfs2_write_inode(fs, di->i_blkno, (char *)di);
+		if (ret)
+			goto out;
+	}
+
+	ret = write_dirblocks(fs, tc);
+
+out:
+	if (our_tc)
+		tunefs_trailer_context_free(our_tc);
+	return ret;
+}
 
 /*
  * Starting, opening, closing, and exiting.
diff --git a/tunefs.ocfs2/libocfs2ne.h b/tunefs.ocfs2/libocfs2ne.h
index 18380be..250ba76 100644
--- a/tunefs.ocfs2/libocfs2ne.h
+++ b/tunefs.ocfs2/libocfs2ne.h
@@ -300,11 +300,50 @@ struct tunefs_trailer_context {
 					   iteration of the directory */
 };
 
+/* A dirblock we have to add a trailer to */
+struct tunefs_trailer_dirblock {
+	struct list_head db_list;
+	uint64_t db_blkno;
+	char *db_buf;
+
+	/*
+	 * These require a little explanation.  They point to
+	 * ocfs2_dir_entry structures inside db_buf.
+	 *
+	 * db_last entry we're going to *keep*.  If the last entry in the
+	 * dirblock has enough extra rec_len to allow the trailer, db_last
+	 * points to it.  We will shorten its rec_len and insert the
+	 * trailer.
+	 *
+	 * However, if the last entry in the dirblock cannot be truncated,
+	 * db_move points to the entry we have to move out, and db_last
+	 * points to the entry before that - the last entry we're keeping
+	 * in this dirblock.
+	 *
+	 * Examples:
+	 *
+	 * - The last entry in the dirblock has a name_len of 1 and a
+	 *   rec_len of 128.  We can easily change the rec_len to 64 and
+	 *   insert the trailer.  db_last points to this entry.
+	 *
+	 * - The last entry in the dirblock has a name_len of 1 and a
+	 *   rec_len of 48.  The previous entry has a name_len of 1 and a
+	 *   rec_len of 32.  We have to move the last entry out.  The
+	 *   second-to-last entry can have its rec_len truncated to 16, so
+	 *   we put it in db_last.
+	 */
+	struct ocfs2_dir_entry *db_last;
+};
+
 /*
  * called from feature_metaecc.c and feature_indexed_dirs.c
  * to install dir trailers
  */
+errcode_t tunefs_prepare_dir_trailer(ocfs2_filesys *fs,
+				     struct ocfs2_dinode *di,
+				     struct tunefs_trailer_context **tc_ret);
 errcode_t tunefs_install_dir_trailer(ocfs2_filesys *fs, struct ocfs2_dinode *di,
 				struct tunefs_trailer_context *tc);
+void tunefs_trailer_context_free(struct tunefs_trailer_context *tc);
 
 #endif  /* _LIBTUNEFS_H */
-- 
1.7.0.2

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File 0016-tunefs.ocfs2-move-o2ne_add_tailers-into-libocfs2ne.c.patch of Package ocfs2-tools (Revision fc8da643a748db24600590fececcd2de)

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