Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mfasheh/ocfs2

* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mfasheh/ocfs2: (23 commits)
  ocfs2: Optionally return filldir errors
  ocfs2: Write support for directories with inline data
  ocfs2: Read support for directories with inline data
  ocfs2: Write support for inline data
  ocfs2: Read support for inline data
  ocfs2: Structure updates for inline data
  ocfs2: Cleanup dirent size check
  ocfs2: Rename cleanups
  ocfs2: Provide convenience function for ino lookup
  ocfs2: Implement ocfs2_empty_dir() as a caller of ocfs2_dir_foreach()
  ocfs2: Remove open coded readdir()
  ocfs2: Pass raw u64 to filldir
  ocfs2: Abstract out core dir listing functionality
  ocfs2: Move directory manipulation code into dir.c
  ocfs2: Small refactor of truncate zeroing code
  ocfs2: move nonsparse hole-filling into ocfs2_write_begin()
  ocfs2: Sync ocfs2_fs.h with ocfs2-tools
  [PATCH] fs/ocfs2/: removed unneeded initial value and function's return value
  ocfs2: Implement show_options()
  ocfs2: Clear slot map when umounting a local volume
  ...

22 files changed, 2386 insertions, 1054 deletions

diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 778a850b463..4ba7f0bdc24 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -354,7 +354,6 @@ struct ocfs2_insert_type {
 	enum ocfs2_append_type	ins_appending;
 	enum ocfs2_contig_type	ins_contig;
 	int			ins_contig_index;
-	int			ins_free_records;
 	int			ins_tree_depth;
 };
 
@@ -362,7 +361,6 @@ struct ocfs2_merge_ctxt {
 	enum ocfs2_contig_type	c_contig_type;
 	int			c_has_empty_extent;
 	int			c_split_covers_rec;
-	int			c_used_tail_recs;
 };
 
 /*
@@ -2808,36 +2806,28 @@ static int ocfs2_try_to_merge_extent(struct inode *inode,
 				     struct ocfs2_merge_ctxt *ctxt)
 
 {
-	int ret = 0, delete_tail_recs = 0;
+	int ret = 0;
 	struct ocfs2_extent_list *el = path_leaf_el(left_path);
 	struct ocfs2_extent_rec *rec = &el->l_recs[split_index];
 
 	BUG_ON(ctxt->c_contig_type == CONTIG_NONE);
 
-	if (ctxt->c_split_covers_rec) {
-		delete_tail_recs++;
-
-		if (ctxt->c_contig_type == CONTIG_LEFTRIGHT ||
-		    ctxt->c_has_empty_extent)
-			delete_tail_recs++;
-
-		if (ctxt->c_has_empty_extent) {
-			/*
-			 * The merge code will need to create an empty
-			 * extent to take the place of the newly
-			 * emptied slot. Remove any pre-existing empty
-			 * extents - having more than one in a leaf is
-			 * illegal.
-			 */
-			ret = ocfs2_rotate_tree_left(inode, handle, left_path,
-						     dealloc);
-			if (ret) {
-				mlog_errno(ret);
-				goto out;
-			}
-			split_index--;
-			rec = &el->l_recs[split_index];
+	if (ctxt->c_split_covers_rec && ctxt->c_has_empty_extent) {
+		/*
+		 * The merge code will need to create an empty
+		 * extent to take the place of the newly
+		 * emptied slot. Remove any pre-existing empty
+		 * extents - having more than one in a leaf is
+		 * illegal.
+		 */
+		ret = ocfs2_rotate_tree_left(inode, handle, left_path,
+					     dealloc);
+		if (ret) {
+			mlog_errno(ret);
+			goto out;
 		}
+		split_index--;
+		rec = &el->l_recs[split_index];
 	}
 
 	if (ctxt->c_contig_type == CONTIG_LEFTRIGHT) {
@@ -3593,6 +3583,7 @@ static int ocfs2_figure_insert_type(struct inode *inode,
 				    struct buffer_head *di_bh,
 				    struct buffer_head **last_eb_bh,
 				    struct ocfs2_extent_rec *insert_rec,
+				    int *free_records,
 				    struct ocfs2_insert_type *insert)
 {
 	int ret;
@@ -3633,7 +3624,7 @@ static int ocfs2_figure_insert_type(struct inode *inode,
 	 * XXX: This test is simplistic, we can search for empty
 	 * extent records too.
 	 */
-	insert->ins_free_records = le16_to_cpu(el->l_count) -
+	*free_records = le16_to_cpu(el->l_count) -
 		le16_to_cpu(el->l_next_free_rec);
 
 	if (!insert->ins_tree_depth) {
@@ -3730,10 +3721,13 @@ int ocfs2_insert_extent(struct ocfs2_super *osb,
 			struct ocfs2_alloc_context *meta_ac)
 {
 	int status;
+	int uninitialized_var(free_records);
 	struct buffer_head *last_eb_bh = NULL;
 	struct ocfs2_insert_type insert = {0, };
 	struct ocfs2_extent_rec rec;
 
+	BUG_ON(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL);
+
 	mlog(0, "add %u clusters at position %u to inode %llu\n",
 	     new_clusters, cpos, (unsigned long long)OCFS2_I(inode)->ip_blkno);
 
@@ -3752,7 +3746,7 @@ int ocfs2_insert_extent(struct ocfs2_super *osb,
 	rec.e_flags = flags;
 
 	status = ocfs2_figure_insert_type(inode, fe_bh, &last_eb_bh, &rec,
-					  &insert);
+					  &free_records, &insert);
 	if (status < 0) {
 		mlog_errno(status);
 		goto bail;
@@ -3762,9 +3756,9 @@ int ocfs2_insert_extent(struct ocfs2_super *osb,
 	     "Insert.contig_index: %d, Insert.free_records: %d, "
 	     "Insert.tree_depth: %d\n",
 	     insert.ins_appending, insert.ins_contig, insert.ins_contig_index,
-	     insert.ins_free_records, insert.ins_tree_depth);
+	     free_records, insert.ins_tree_depth);
 
-	if (insert.ins_contig == CONTIG_NONE && insert.ins_free_records == 0) {
+	if (insert.ins_contig == CONTIG_NONE && free_records == 0) {
 		status = ocfs2_grow_tree(inode, handle, fe_bh,
 					 &insert.ins_tree_depth, &last_eb_bh,
 					 meta_ac);
@@ -3847,26 +3841,17 @@ leftright:
 
 	if (le16_to_cpu(rightmost_el->l_next_free_rec) ==
 	    le16_to_cpu(rightmost_el->l_count)) {
-		int old_depth = depth;
-
 		ret = ocfs2_grow_tree(inode, handle, di_bh, &depth, last_eb_bh,
 				      meta_ac);
 		if (ret) {
 			mlog_errno(ret);
 			goto out;
 		}
-
-		if (old_depth != depth) {
-			eb = (struct ocfs2_extent_block *)(*last_eb_bh)->b_data;
-			rightmost_el = &eb->h_list;
-		}
 	}
 
 	memset(&insert, 0, sizeof(struct ocfs2_insert_type));
 	insert.ins_appending = APPEND_NONE;
 	insert.ins_contig = CONTIG_NONE;
-	insert.ins_free_records = le16_to_cpu(rightmost_el->l_count)
-		- le16_to_cpu(rightmost_el->l_next_free_rec);
 	insert.ins_tree_depth = depth;
 
 	insert_range = le32_to_cpu(split_rec.e_cpos) +
@@ -4015,11 +4000,6 @@ static int __ocfs2_mark_extent_written(struct inode *inode,
 	} else
 		rightmost_el = path_root_el(path);
 
-	ctxt.c_used_tail_recs = le16_to_cpu(rightmost_el->l_next_free_rec);
-	if (ctxt.c_used_tail_recs > 0 &&
-	    ocfs2_is_empty_extent(&rightmost_el->l_recs[0]))
-		ctxt.c_used_tail_recs--;
-
 	if (rec->e_cpos == split_rec->e_cpos &&
 	    rec->e_leaf_clusters == split_rec->e_leaf_clusters)
 		ctxt.c_split_covers_rec = 1;
@@ -4028,10 +4008,9 @@ static int __ocfs2_mark_extent_written(struct inode *inode,
 
 	ctxt.c_has_empty_extent = ocfs2_is_empty_extent(&el->l_recs[0]);
 
-	mlog(0, "index: %d, contig: %u, used_tail_recs: %u, "
-	     "has_empty: %u, split_covers: %u\n", split_index,
-	     ctxt.c_contig_type, ctxt.c_used_tail_recs,
-	     ctxt.c_has_empty_extent, ctxt.c_split_covers_rec);
+	mlog(0, "index: %d, contig: %u, has_empty: %u, split_covers: %u\n",
+	     split_index, ctxt.c_contig_type, ctxt.c_has_empty_extent,
+	     ctxt.c_split_covers_rec);
 
 	if (ctxt.c_contig_type == CONTIG_NONE) {
 		if (ctxt.c_split_covers_rec)
@@ -4180,27 +4159,18 @@ static int ocfs2_split_tree(struct inode *inode, struct buffer_head *di_bh,
 
 	if (le16_to_cpu(rightmost_el->l_next_free_rec) ==
 	    le16_to_cpu(rightmost_el->l_count)) {
-		int old_depth = depth;
-
 		ret = ocfs2_grow_tree(inode, handle, di_bh, &depth, &last_eb_bh,
 				      meta_ac);
 		if (ret) {
 			mlog_errno(ret);
 			goto out;
 		}
-
-		if (old_depth != depth) {
-			eb = (struct ocfs2_extent_block *)last_eb_bh->b_data;
-			rightmost_el = &eb->h_list;
-		}
 	}
 
 	memset(&insert, 0, sizeof(struct ocfs2_insert_type));
 	insert.ins_appending = APPEND_NONE;
 	insert.ins_contig = CONTIG_NONE;
 	insert.ins_split = SPLIT_RIGHT;
-	insert.ins_free_records = le16_to_cpu(rightmost_el->l_count)
-		- le16_to_cpu(rightmost_el->l_next_free_rec);
 	insert.ins_tree_depth = depth;
 
 	ret = ocfs2_do_insert_extent(inode, handle, di_bh, &split_rec, &insert);
@@ -5665,12 +5635,50 @@ static int ocfs2_ordered_zero_func(handle_t *handle, struct buffer_head *bh)
 	return ocfs2_journal_dirty_data(handle, bh);
 }
 
+static void ocfs2_map_and_dirty_page(struct inode *inode, handle_t *handle,
+				     unsigned int from, unsigned int to,
+				     struct page *page, int zero, u64 *phys)
+{
+	int ret, partial = 0;
+
+	ret = ocfs2_map_page_blocks(page, phys, inode, from, to, 0);
+	if (ret)
+		mlog_errno(ret);
+
+	if (zero)
+		zero_user_page(page, from, to - from, KM_USER0);
+
+	/*
+	 * Need to set the buffers we zero'd into uptodate
+	 * here if they aren't - ocfs2_map_page_blocks()
+	 * might've skipped some
+	 */
+	if (ocfs2_should_order_data(inode)) {
+		ret = walk_page_buffers(handle,
+					page_buffers(page),
+					from, to, &partial,
+					ocfs2_ordered_zero_func);
+		if (ret < 0)
+			mlog_errno(ret);
+	} else {
+		ret = walk_page_buffers(handle, page_buffers(page),
+					from, to, &partial,
+					ocfs2_writeback_zero_func);
+		if (ret < 0)
+			mlog_errno(ret);
+	}
+
+	if (!partial)
+		SetPageUptodate(page);
+
+	flush_dcache_page(page);
+}
+
 static void ocfs2_zero_cluster_pages(struct inode *inode, loff_t start,
 				     loff_t end, struct page **pages,
 				     int numpages, u64 phys, handle_t *handle)
 {
-	int i, ret, partial = 0;
-	void *kaddr;
+	int i;
 	struct page *page;
 	unsigned int from, to = PAGE_CACHE_SIZE;
 	struct super_block *sb = inode->i_sb;
@@ -5691,87 +5699,31 @@ static void ocfs2_zero_cluster_pages(struct inode *inode, loff_t start,
 		BUG_ON(from > PAGE_CACHE_SIZE);
 		BUG_ON(to > PAGE_CACHE_SIZE);
 
-		ret = ocfs2_map_page_blocks(page, &phys, inode, from, to, 0);
-		if (ret)
-			mlog_errno(ret);
-
-		kaddr = kmap_atomic(page, KM_USER0);
-		memset(kaddr + from, 0, to - from);
-		kunmap_atomic(kaddr, KM_USER0);
-
-		/*
-		 * Need to set the buffers we zero'd into uptodate
-		 * here if they aren't - ocfs2_map_page_blocks()
-		 * might've skipped some
-		 */
-		if (ocfs2_should_order_data(inode)) {
-			ret = walk_page_buffers(handle,
-						page_buffers(page),
-						from, to, &partial,
-						ocfs2_ordered_zero_func);
-			if (ret < 0)
-				mlog_errno(ret);
-		} else {
-			ret = walk_page_buffers(handle, page_buffers(page),
-						from, to, &partial,
-						ocfs2_writeback_zero_func);
-			if (ret < 0)
-				mlog_errno(ret);
-		}
-
-		if (!partial)
-			SetPageUptodate(page);
-
-		flush_dcache_page(page);
+		ocfs2_map_and_dirty_page(inode, handle, from, to, page, 1,
+					 &phys);
 
 		start = (page->index + 1) << PAGE_CACHE_SHIFT;
 	}
 out:
-	if (pages) {
-		for (i = 0; i < numpages; i++) {
-			page = pages[i];
-			unlock_page(page);
-			mark_page_accessed(page);
-			page_cache_release(page);
-		}
-	}
+	if (pages)
+		ocfs2_unlock_and_free_pages(pages, numpages);
 }
 
 static int ocfs2_grab_eof_pages(struct inode *inode, loff_t start, loff_t end,
-				struct page **pages, int *num, u64 *phys)
+				struct page **pages, int *num)
 {
-	int i, numpages = 0, ret = 0;
-	unsigned int ext_flags;
+	int numpages, ret = 0;
 	struct super_block *sb = inode->i_sb;
 	struct address_space *mapping = inode->i_mapping;
 	unsigned long index;
 	loff_t last_page_bytes;
 
-	BUG_ON(!ocfs2_sparse_alloc(OCFS2_SB(sb)));
 	BUG_ON(start > end);
 
-	if (start == end)
-		goto out;
-
 	BUG_ON(start >> OCFS2_SB(sb)->s_clustersize_bits !=
 	       (end - 1) >> OCFS2_SB(sb)->s_clustersize_bits);
 
-	ret = ocfs2_extent_map_get_blocks(inode, start >> sb->s_blocksize_bits,
-					  phys, NULL, &ext_flags);
-	if (ret) {
-		mlog_errno(ret);
-		goto out;
-	}
-
-	/* Tail is a hole. */
-	if (*phys == 0)
-		goto out;
-
-	/* Tail is marked as unwritten, we can count on write to zero
-	 * in that case. */
-	if (ext_flags & OCFS2_EXT_UNWRITTEN)
-		goto out;
-
+	numpages = 0;
 	last_page_bytes = PAGE_ALIGN(end);
 	index = start >> PAGE_CACHE_SHIFT;
 	do {
@@ -5788,14 +5740,8 @@ static int ocfs2_grab_eof_pages(struct inode *inode, loff_t start, loff_t end,
 
 out:
 	if (ret != 0) {
-		if (pages) {
-			for (i = 0; i < numpages; i++) {
-				if (pages[i]) {
-					unlock_page(pages[i]);
-					page_cache_release(pages[i]);
-				}
-			}
-		}
+		if (pages)
+			ocfs2_unlock_and_free_pages(pages, numpages);
 		numpages = 0;
 	}
 
@@ -5816,18 +5762,20 @@ out:
 int ocfs2_zero_range_for_truncate(struct inode *inode, handle_t *handle,
 				  u64 range_start, u64 range_end)
 {
-	int ret, numpages;
+	int ret = 0, numpages;
 	struct page **pages = NULL;
 	u64 phys;
+	unsigned int ext_flags;
+	struct super_block *sb = inode->i_sb;
 
 	/*
 	 * File systems which don't support sparse files zero on every
 	 * extend.
 	 */
-	if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
+	if (!ocfs2_sparse_alloc(OCFS2_SB(sb)))
 		return 0;
 
-	pages = kcalloc(ocfs2_pages_per_cluster(inode->i_sb),
+	pages = kcalloc(ocfs2_pages_per_cluster(sb),
 			sizeof(struct page *), GFP_NOFS);
 	if (pages == NULL) {
 		ret = -ENOMEM;
@@ -5835,16 +5783,31 @@ int ocfs2_zero_range_for_truncate(struct inode *inode, handle_t *handle,
 		goto out;
 	}
 
-	ret = ocfs2_grab_eof_pages(inode, range_start, range_end, pages,
-				   &numpages, &phys);
+	if (range_start == range_end)
+		goto out;
+
+	ret = ocfs2_extent_map_get_blocks(inode,
+					  range_start >> sb->s_blocksize_bits,
+					  &phys, NULL, &ext_flags);
 	if (ret) {
 		mlog_errno(ret);
 		goto out;
 	}
 
-	if (numpages == 0)
+	/*
+	 * Tail is a hole, or is marked unwritten. In either case, we
+	 * can count on read and write to return/push zero's.
+	 */
+	if (phys == 0 || ext_flags & OCFS2_EXT_UNWRITTEN)
 		goto out;
 
+	ret = ocfs2_grab_eof_pages(inode, range_start, range_end, pages,
+				   &numpages);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+
 	ocfs2_zero_cluster_pages(inode, range_start, range_end, pages,
 				 numpages, phys, handle);
 
@@ -5865,6 +5828,178 @@ out:
 	return ret;
 }
 
+static void ocfs2_zero_dinode_id2(struct inode *inode, struct ocfs2_dinode *di)
+{
+	unsigned int blocksize = 1 << inode->i_sb->s_blocksize_bits;
+
+	memset(&di->id2, 0, blocksize - offsetof(struct ocfs2_dinode, id2));
+}
+
+void ocfs2_dinode_new_extent_list(struct inode *inode,
+				  struct ocfs2_dinode *di)
+{
+	ocfs2_zero_dinode_id2(inode, di);
+	di->id2.i_list.l_tree_depth = 0;
+	di->id2.i_list.l_next_free_rec = 0;
+	di->id2.i_list.l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(inode->i_sb));
+}
+
+void ocfs2_set_inode_data_inline(struct inode *inode, struct ocfs2_dinode *di)
+{
+	struct ocfs2_inode_info *oi = OCFS2_I(inode);
+	struct ocfs2_inline_data *idata = &di->id2.i_data;
+
+	spin_lock(&oi->ip_lock);
+	oi->ip_dyn_features |= OCFS2_INLINE_DATA_FL;
+	di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
+	spin_unlock(&oi->ip_lock);
+
+	/*
+	 * We clear the entire i_data structure here so that all
+	 * fields can be properly initialized.
+	 */
+	ocfs2_zero_dinode_id2(inode, di);
+
+	idata->id_count = cpu_to_le16(ocfs2_max_inline_data(inode->i_sb));
+}
+
+int ocfs2_convert_inline_data_to_extents(struct inode *inode,
+					 struct buffer_head *di_bh)
+{
+	int ret, i, has_data, num_pages = 0;
+	handle_t *handle;
+	u64 uninitialized_var(block);
+	struct ocfs2_inode_info *oi = OCFS2_I(inode);
+	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+	struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+	struct ocfs2_alloc_context *data_ac = NULL;
+	struct page **pages = NULL;
+	loff_t end = osb->s_clustersize;
+
+	has_data = i_size_read(inode) ? 1 : 0;
+
+	if (has_data) {
+		pages = kcalloc(ocfs2_pages_per_cluster(osb->sb),
+				sizeof(struct page *), GFP_NOFS);
+		if (pages == NULL) {
+			ret = -ENOMEM;
+			mlog_errno(ret);
+			goto out;
+		}
+
+		ret = ocfs2_reserve_clusters(osb, 1, &data_ac);
+		if (ret) {
+			mlog_errno(ret);
+			goto out;
+		}
+	}
+
+	handle = ocfs2_start_trans(osb, OCFS2_INLINE_TO_EXTENTS_CREDITS);
+	if (IS_ERR(handle)) {
+		ret = PTR_ERR(handle);
+		mlog_errno(ret);
+		goto out_unlock;
+	}
+
+	ret = ocfs2_journal_access(handle, inode, di_bh,
+				   OCFS2_JOURNAL_ACCESS_WRITE);
+	if (ret) {
+		mlog_errno(ret);
+		goto out_commit;
+	}
+
+	if (has_data) {
+		u32 bit_off, num;
+		unsigned int page_end;
+		u64 phys;
+
+		ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off,
+					   &num);
+		if (ret) {
+			mlog_errno(ret);
+			goto out_commit;
+		}
+
+		/*
+		 * Save two copies, one for insert, and one that can
+		 * be changed by ocfs2_map_and_dirty_page() below.
+		 */
+		block = phys = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
+
+		/*
+		 * Non sparse file systems zero on extend, so no need
+		 * to do that now.
+		 */
+		if (!ocfs2_sparse_alloc(osb) &&
+		    PAGE_CACHE_SIZE < osb->s_clustersize)
+			end = PAGE_CACHE_SIZE;
+
+		ret = ocfs2_grab_eof_pages(inode, 0, end, pages, &num_pages);
+		if (ret) {
+			mlog_errno(ret);
+			goto out_commit;
+		}
+
+		/*
+		 * This should populate the 1st page for us and mark
+		 * it up to date.
+		 */
+		ret = ocfs2_read_inline_data(inode, pages[0], di_bh);
+		if (ret) {
+			mlog_errno(ret);
+			goto out_commit;
+		}
+
+		page_end = PAGE_CACHE_SIZE;
+		if (PAGE_CACHE_SIZE > osb->s_clustersize)
+			page_end = osb->s_clustersize;
+
+		for (i = 0; i < num_pages; i++)
+			ocfs2_map_and_dirty_page(inode, handle, 0, page_end,
+						 pages[i], i > 0, &phys);
+	}
+
+	spin_lock(&oi->ip_lock);
+	oi->ip_dyn_features &= ~OCFS2_INLINE_DATA_FL;
+	di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
+	spin_unlock(&oi->ip_lock);
+
+	ocfs2_dinode_new_extent_list(inode, di);
+
+	ocfs2_journal_dirty(handle, di_bh);
+
+	if (has_data) {
+		/*
+		 * An error at this point should be extremely rare. If
+		 * this proves to be false, we could always re-build
+		 * the in-inode data from our pages.
+		 */
+		ret = ocfs2_insert_extent(osb, handle, inode, di_bh,
+					  0, block, 1, 0, NULL);
+		if (ret) {
+			mlog_errno(ret);
+			goto out_commit;
+		}
+
+		inode->i_blocks = ocfs2_inode_sector_count(inode);
+	}
+
+out_commit:
+	ocfs2_commit_trans(osb, handle);
+
+out_unlock:
+	if (data_ac)
+		ocfs2_free_alloc_context(data_ac);
+
+out:
+	if (pages) {
+		ocfs2_unlock_and_free_pages(pages, num_pages);
+		kfree(pages);
+	}
+
+	return ret;
+}
+
 /*
  * It is expected, that by the time you call this function,
  * inode->i_size and fe->i_size have been adjusted.
@@ -6090,6 +6225,81 @@ bail:
 	return status;
 }
 
+/*
+ * 'start' is inclusive, 'end' is not.
+ */
+int ocfs2_truncate_inline(struct inode *inode, struct buffer_head *di_bh,
+			  unsigned int start, unsigned int end, int trunc)
+{
+	int ret;
+	unsigned int numbytes;
+	handle_t *handle;
+	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+	struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+	struct ocfs2_inline_data *idata = &di->id2.i_data;
+
+	if (end > i_size_read(inode))
+		end = i_size_read(inode);
+
+	BUG_ON(start >= end);
+
+	if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) ||
+	    !(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL) ||
+	    !ocfs2_supports_inline_data(osb)) {
+		ocfs2_error(inode->i_sb,
+			    "Inline data flags for inode %llu don't agree! "
+			    "Disk: 0x%x, Memory: 0x%x, Superblock: 0x%x\n",
+			    (unsigned long long)OCFS2_I(inode)->ip_blkno,
+			    le16_to_cpu(di->i_dyn_features),
+			    OCFS2_I(inode)->ip_dyn_features,
+			    osb->s_feature_incompat);
+		ret = -EROFS;
+		goto out;
+	}
+
+	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
+	if (IS_ERR(handle)) {
+		ret = PTR_ERR(handle);
+		mlog_errno(ret);
+		goto out;
+	}
+
+	ret = ocfs2_journal_access(handle, inode, di_bh,
+				   OCFS2_JOURNAL_ACCESS_WRITE);
+	if (ret) {
+		mlog_errno(ret);
+		goto out_commit;
+	}
+
+	numbytes = end - start;
+	memset(idata->id_data + start, 0, numbytes);
+
+	/*
+	 * No need to worry about the data page here - it's been
+	 * truncated already and inline data doesn't need it for
+	 * pushing zero's to disk, so we'll let readpage pick it up
+	 * later.
+	 */
+	if (trunc) {
+		i_size_write(inode, start);
+		di->i_size = cpu_to_le64(start);
+	}
+
+	inode->i_blocks = ocfs2_inode_sector_count(inode);
+	inode->i_ctime = inode->i_mtime = CURRENT_TIME;
+
+	di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
+	di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
+
+	ocfs2_journal_dirty(handle, di_bh);
+
+out_commit:
+	ocfs2_commit_trans(osb, handle);
+
+out:
+	return ret;
+}
+
 static void ocfs2_free_truncate_context(struct ocfs2_truncate_context *tc)
 {
 	/*
diff --git a/fs/ocfs2/alloc.h b/fs/ocfs2/alloc.h
index 990df48ae8d..42ff94bd801 100644
--- a/fs/ocfs2/alloc.h
+++ b/fs/ocfs2/alloc.h
@@ -62,6 +62,11 @@ static inline int ocfs2_extend_meta_needed(struct ocfs2_dinode *fe)
 	return le16_to_cpu(fe->id2.i_list.l_tree_depth) + 2;
 }
 
+void ocfs2_dinode_new_extent_list(struct inode *inode, struct ocfs2_dinode *di);
+void ocfs2_set_inode_data_inline(struct inode *inode, struct ocfs2_dinode *di);
+int ocfs2_convert_inline_data_to_extents(struct inode *inode,
+					 struct buffer_head *di_bh);
+
 int ocfs2_truncate_log_init(struct ocfs2_super *osb);
 void ocfs2_truncate_log_shutdown(struct ocfs2_super *osb);
 void ocfs2_schedule_truncate_log_flush(struct ocfs2_super *osb,
@@ -115,6 +120,8 @@ int ocfs2_commit_truncate(struct ocfs2_super *osb,
 			  struct inode *inode,
 			  struct buffer_head *fe_bh,
 			  struct ocfs2_truncate_context *tc);
+int ocfs2_truncate_inline(struct inode *inode, struct buffer_head *di_bh,
+			  unsigned int start, unsigned int end, int trunc);
 
 int ocfs2_find_leaf(struct inode *inode, struct ocfs2_extent_list *root_el,
 		    u32 cpos, struct buffer_head **leaf_bh);
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index f37f25c931f..34d10452c56 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -206,9 +206,70 @@ bail:
 	return err;
 }
 
+int ocfs2_read_inline_data(struct inode *inode, struct page *page,
+			   struct buffer_head *di_bh)
+{
+	void *kaddr;
+	unsigned int size;
+	struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+
+	if (!(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL)) {
+		ocfs2_error(inode->i_sb, "Inode %llu lost inline data flag",
+			    (unsigned long long)OCFS2_I(inode)->ip_blkno);
+		return -EROFS;
+	}
+
+	size = i_size_read(inode);
+
+	if (size > PAGE_CACHE_SIZE ||
+	    size > ocfs2_max_inline_data(inode->i_sb)) {
+		ocfs2_error(inode->i_sb,
+			    "Inode %llu has with inline data has bad size: %u",
+			    (unsigned long long)OCFS2_I(inode)->ip_blkno, size);
+		return -EROFS;
+	}
+
+	kaddr = kmap_atomic(page, KM_USER0);
+	if (size)
+		memcpy(kaddr, di->id2.i_data.id_data, size);
+	/* Clear the remaining part of the page */
+	memset(kaddr + size, 0, PAGE_CACHE_SIZE - size);
+	flush_dcache_page(page);
+	kunmap_atomic(kaddr, KM_USER0);
+
+	SetPageUptodate(page);
+
+	return 0;
+}
+
+static int ocfs2_readpage_inline(struct inode *inode, struct page *page)
+{
+	int ret;
+	struct buffer_head *di_bh = NULL;
+	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+	BUG_ON(!PageLocked(page));
+	BUG_ON(!OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL);
+
+	ret = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &di_bh,
+			       OCFS2_BH_CACHED, inode);
+	if (ret) {
+		mlog_errno(ret);
+		goto out;
+	}
+
+	ret = ocfs2_read_inline_data(inode, page, di_bh);
+out:
+	unlock_page(page);
+
+	brelse(di_bh);
+	return ret;
+}
+
 static int ocfs2_readpage(struct file *file, struct page *page)
 {
 	struct inode *inode = page->mapping->host;
+	struct ocfs2_inode_info *oi = OCFS2_I(inode);
 	loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT;
 	int ret, unlock = 1;
 
@@ -222,7 +283,7 @@ static int ocfs2_readpage(struct file *file, struct page *page)
 		goto out;
 	}
 
-	if (down_read_trylock(&OCFS2_I(inode)->ip_alloc_sem) == 0) {
+	if (down_read_trylock(&oi->ip_alloc_sem) == 0) {
 		ret = AOP_TRUNCATED_PAGE;
 		goto out_meta_unlock;
 	}
@@ -252,7 +313,10 @@ static int ocfs2_readpage(struct file *file, struct page *page)
 		goto out_alloc;
 	}
 
-	ret = block_read_full_page(page, ocfs2_get_block);
+	if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
+		ret = ocfs2_readpage_inline(inode, page);
+	else
+		ret = block_read_full_page(page, ocfs2_get_block);
 	unlock = 0;
 
 	ocfs2_data_unlock(inode, 0);
@@ -301,12 +365,8 @@ int ocfs2_prepare_write_nolock(struct inode *inode, struct page *page,
 {
 	int ret;
 
-	down_read(&OCFS2_I(inode)->ip_alloc_sem);
-
 	ret = block_prepare_write(page, from, to, ocfs2_get_block);
 
-	up_read(&OCFS2_I(inode)->ip_alloc_sem);
-
 	return ret;
 }
 
@@ -401,7 +461,9 @@ static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block)
 		down_read(&OCFS2_I(inode)->ip_alloc_sem);
 	}
 
-	err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL, NULL);
+	if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
+		err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL,
+						  NULL);
 
 	if (!INODE_JOURNAL(inode)) {
 		up_read(&OCFS2_I(inode)->ip_alloc_sem);
@@ -415,7 +477,6 @@ static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block)
 		goto bail;
 	}
 
-
 bail:
 	status = err ? 0 : p_blkno;
 
@@ -570,6 +631,13 @@ static ssize_t ocfs2_direct_IO(int rw,
 
 	mlog_entry_void();
 
+	/*
+	 * Fallback to buffered I/O if we see an inode without
+	 * extents.
+	 */
+	if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
+		return 0;
+
 	if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) {
 		/*
 		 * We get PR data locks even for O_DIRECT.  This
@@ -834,18 +902,22 @@ struct ocfs2_write_ctxt {
 	struct ocfs2_cached_dealloc_ctxt w_dealloc;
 };
 
-static void ocfs2_free_write_ctxt(struct ocfs2_write_ctxt *wc)
+void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages)
 {
 	int i;
 
-	for(i = 0; i < wc->w_num_pages; i++) {
-		if (wc->w_pages[i] == NULL)
-			continue;
-
-		unlock_page(wc->w_pages[i]);
-		mark_page_accessed(wc->w_pages[i]);
-		page_cache_release(wc->w_pages[i]);
+	for(i = 0; i < num_pages; i++) {
+		if (pages[i]) {
+			unlock_page(pages[i]);
+			mark_page_accessed(pages[i]);
+			page_cache_release(pages[i]);
+		}
 	}
+}
+
+static void ocfs2_free_write_ctxt(struct ocfs2_write_ctxt *wc)
+{
+	ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages);
 
 	brelse(wc->w_di_bh);
 	kfree(wc);
@@ -1360,6 +1432,160 @@ out:
 	return ret;
 }
 
+static int ocfs2_write_begin_inline(struct address_space *mapping,
+				    struct inode *inode,
+				    struct ocfs2_write_ctxt *wc)
+{
+	int ret;
+	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+	struct page *page;
+	handle_t *handle;
+	struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
+
+	page = find_or_create_page(mapping, 0, GFP_NOFS);
+	if (!page) {
+		ret = -ENOMEM;
+		mlog_errno(ret);
+		goto out;
+	}
+	/*
+	 * If we don't set w_num_pages then this page won't get unlocked
+	 * and freed on cleanup of the write context.
+	 */
+	wc->w_pages[0] = wc->w_target_page = page;
+	wc->w_num_pages = 1;
+
+	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
+	if (IS_ERR(handle)) {
+		ret = PTR_ERR(handle);
+		mlog_errno(ret);
+		goto out;
+	}
+
+	ret = ocfs2_journal_access(handle, inode, wc->w_di_bh,
+				   OCFS2_JOURNAL_ACCESS_WRITE);
+	if (ret) {
+		ocfs2_commit_trans(osb, handle);
+
+		mlog_errno(ret);
+		goto out;
+	}
+
+	if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
+		ocfs2_set_inode_data_inline(inode, di);
+
+	if (!PageUptodate(page)) {
+		ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh);
+		if (ret) {
+			ocfs2_commit_trans(osb, handle);
+
+			goto out;
+		}
+	}
+
+	wc->w_handle = handle;
+out:
+	return ret;
+}
+
+int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size)
+{
+	struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+
+	if (new_size < le16_to_cpu(di->id2.i_data.id_count))
+		return 1;
+	return 0;
+}
+
+static int ocfs2_try_to_write_inline_data(struct address_space *mapping,
+					  struct inode *inode, loff_t pos,
+					  unsigned len, struct page *mmap_page,
+					  struct ocfs2_write_ctxt *wc)
+{
+	int ret, written = 0;
+	loff_t end = pos + len;
+	struct ocfs2_inode_info *oi = OCFS2_I(inode);
+
+	mlog(0, "Inode %llu, write of %u bytes at off %llu. features: 0x%x\n",
+	     (unsigned lon