[PATCH 2/3] f2fs: support finding extents after isize

[Fan Li <fanofcode.li@samsung.com>]

f2fs allows preallocation beyond isize, but f2fs_fiemap only look up
extents within isize. Therefore add this support.

Note: It's possible that there are holes after isize, for example,
fallocate  multiple discontinuous extents after isize with 
FALLOC_FL_KEEP_SIZE set. Since I can tell no differences between 
EOF and holes from return of get_data_block, I'm afaid this patch
can't support such scenarios. 


Signed-off-by: Fan li <fanofcode.li@samsung.com>
---
 fs/f2fs/data.c |    7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index a9a4d89..f89cf07 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -798,12 +798,6 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 	isize = i_size_read(inode);
 
 	mutex_lock(&inode->i_mutex);
-	if (start >= isize)
-		goto out;
-
-	if (start + len > isize)
-		len = isize - start;
-
 	if (logical_to_blk(inode, len) == 0)
 		len = blk_to_logical(inode, 1);
 
@@ -829,6 +823,7 @@ next:
 		 * punch holes beyond isize and keep size unchanged.
 		 */
 		flags |= FIEMAP_EXTENT_LAST;
+		last_blk = start_blk - 1;
 	}
 
 	if (size)
-- 
1.7.9.5


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