[PATCH] efs: fix direct extent lookup for indirect extents

[Keshav Verma <iganschel@gmail.com>]

The loop that finds the direct extent containing an indirect extent used
cur < ibase as its condition. Since ibase starts at zero, the loop never
advances for normal non-negative cur values, so only the first direct
extent is considered.

Iterate over the direct extents and stop when cur falls within the range
covered by the current direct extent.

Signed-off-by: Keshav Verma <iganschel@gmail.com>
---
 fs/efs/inode.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/fs/efs/inode.c b/fs/efs/inode.c
index 4b132729e638..16b5ee10e323 100644
--- a/fs/efs/inode.c
+++ b/fs/efs/inode.c
@@ -254,9 +254,14 @@ efs_block_t efs_map_block(struct inode *inode, efs_block_t block) {
 		 *
 		 */
 		ibase = 0;
-		for(dirext = 0; cur < ibase && dirext < direxts; dirext++) {
-			ibase += in->extents[dirext].cooked.ex_length *
+		for (dirext = 0; dirext < direxts; dirext++) {
+			int entries = in->extents[dirext].cooked.ex_length *
 				(EFS_BLOCKSIZE / sizeof(efs_extent));
+
+			if (cur < ibase + entries)
+				break;
+
+			ibase += entries;
 		}
 
 		if (dirext == direxts) {
-- 
2.39.5