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authorTheodore Ts'o <tytso@mit.edu>2011-09-09 18:46:51 -0400
committerTheodore Ts'o <tytso@mit.edu>2011-09-09 18:46:51 -0400
commit3212a80a58062056bb922811071062be58d8fee1 (patch)
tree0ae97cdc351f18e9090c8b33505eabe59c3da21c /fs/ext4/balloc.c
parentd5b8f31007a93777cfb0603b665858fb7aebebfc (diff)
ext4: convert block group-relative offsets to use clusters
Certain parts of the ext4 code base, primarily in mballoc.c, use a block group number and offset from the beginning of the block group. This offset is invariably used to index into the allocation bitmap, so change the offset to be denominated in units of clusters. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/balloc.c')
-rw-r--r--fs/ext4/balloc.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 1c6d777b35a..89abf1f7b25 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -28,7 +28,8 @@
*/
/*
- * Calculate the block group number and offset, given a block number
+ * Calculate the block group number and offset into the block/cluster
+ * allocation bitmap, given a block number
*/
void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp)
@@ -37,7 +38,8 @@ void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
ext4_grpblk_t offset;
blocknr = blocknr - le32_to_cpu(es->s_first_data_block);
- offset = do_div(blocknr, EXT4_BLOCKS_PER_GROUP(sb));
+ offset = do_div(blocknr, EXT4_BLOCKS_PER_GROUP(sb)) >>
+ EXT4_SB(sb)->s_cluster_bits;
if (offsetp)
*offsetp = offset;
if (blockgrpp)