Btrfs: mount -o max_inline=size to control the maximum inline extent size

Signed-off-by: Chris Mason <chris.mason@oracle.com>

fs/btrfs/ctree.h

@@ -325,6 +325,7 @@ struct btrfs_fs_info {
 	u64 last_trans_committed;
 	unsigned long mount_opt;
 	u64 max_extent;
+	u64 max_inline;
 	u64 alloc_start;
 	struct btrfs_transaction *running_transaction;
 	struct btrfs_super_block super_copy;

fs/btrfs/disk-io.c

@@ -659,6 +659,7 @@ struct btrfs_root *open_ctree(struct super_block *sb)
 	fs_info->throttles = 0;
 	fs_info->mount_opt = 0;
 	fs_info->max_extent = (u64)-1;
+	fs_info->max_inline = 8192 * 1024;
 	fs_info->delalloc_bytes = 0;
 	fs_info->btree_inode = new_inode(sb);
 	fs_info->btree_inode->i_ino = 1;

fs/btrfs/extent_io.c

@@ -2451,7 +2451,6 @@ sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
 		goto out;
 
 	sector = (em->block_start + start - em->start) >> inode->i_blkbits;
-printk("bmap finds %Lu %Lu block %Lu\n", em->start, em->len, em->block_start);
 out:
 	free_extent_map(em);
 	return sector;

fs/btrfs/file.c

@@ -301,7 +301,8 @@ static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans,
 	 */
 	inline_size = end_pos;
 	if (isize >= BTRFS_MAX_INLINE_DATA_SIZE(root) ||
-	    inline_size > 8192 ||
+	    inline_size > root->fs_info->max_inline ||
+	    (inline_size & (root->sectorsize -1)) == 0 ||
 	    inline_size >= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
 		u64 last_end;
 		u64 existing_delalloc = 0;

fs/btrfs/super.c

@@ -64,7 +64,7 @@ static void btrfs_put_super (struct super_block * sb)
 
 enum {
 	Opt_subvol, Opt_nodatasum, Opt_nodatacow, Opt_max_extent,
-	Opt_alloc_start, Opt_nobarrier, Opt_ssd, Opt_err,
+	Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, Opt_err,
 };
 
 static match_table_t tokens = {
@@ -73,6 +73,7 @@ static match_table_t tokens = {
 	{Opt_nodatacow, "nodatacow"},
 	{Opt_nobarrier, "nobarrier"},
 	{Opt_max_extent, "max_extent=%s"},
+	{Opt_max_inline, "max_inline=%s"},
 	{Opt_alloc_start, "alloc_start=%s"},
 	{Opt_ssd, "ssd"},
 	{Opt_err, NULL}
@@ -178,6 +179,22 @@ static int parse_options (char * options,
 				}
 			}
 			break;
+		case Opt_max_inline:
+			if (info) {
+				char *num = match_strdup(&args[0]);
+				if (num) {
+					info->max_inline =
+						btrfs_parse_size(num);
+					kfree(num);
+
+					info->max_inline = max_t(u64,
+							 info->max_inline,
+							 root->sectorsize);
+					printk("btrfs: max_inline at %Lu\n",
+					       info->max_inline);
+				}
+			}
+			break;
 		case Opt_alloc_start:
 			if (info) {
 				char *num = match_strdup(&args[0]);