Commit 80942521 authored by Jan Kara's avatar Jan Kara
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udf: Add flag to disable block preallocation 



In some cases we don't want to create block preallocation when
allocating blocks. Add a flag to udf_map_rq controlling the behavior.

Signed-off-by: default avatarJan Kara <jack@suse.cz>
parent b3c03fce

fs/udf/inode.c

+11 −6
Original line number Diff line number Diff line
@@ -323,6 +323,7 @@ int udf_expand_file_adinicb(struct inode *inode) 
}



#define UDF_MAP_CREATE		0x01	/* Mapping can allocate new blocks */

#define UDF_MAP_NOPREALLOC	0x02	/* Do not preallocate blocks */



#define UDF_BLK_MAPPED	0x01	/* Block was successfully mapped */

#define UDF_BLK_NEW	0x02	/* Block was freshly allocated */
@@ -381,6 +382,14 @@ static int udf_get_block(struct inode *inode, sector_t block, 
		.iflags = create ? UDF_MAP_CREATE : 0,

	};



	/*

	 * We preallocate blocks only for regular files. It also makes sense

	 * for directories but there's a problem when to drop the

	 * preallocation. We might use some delayed work for that but I feel

	 * it's overengineering for a filesystem like UDF.

	 */

	if (!S_ISREG(inode->i_mode))

		map.iflags |= UDF_MAP_NOPREALLOC;

	err = udf_map_block(inode, &map);

	if (err < 0)

		return err;
@@ -808,11 +817,7 @@ static int inode_getblk(struct inode *inode, struct udf_map_rq *map) 
	 * block */

	udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);



	/* We preallocate blocks only for regular files. It also makes sense

	 * for directories but there's a problem when to drop the

	 * preallocation. We might use some delayed work for that but I feel

	 * it's overengineering for a filesystem like UDF. */

	if (S_ISREG(inode->i_mode))

	if (!(map->iflags & UDF_MAP_NOPREALLOC))

		udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);



	/* merge any continuous blocks in laarr */