ext4: extent macros cleanup

Use the EXT_LAST_INDEX macro; that's what it's there for.

Clean up ext4_ext_ext_grow_indepth() so the correct EXT_FIRST_INDEX or
EXT_FIRST_MACRO is used as necessary.  The two macros are equivalent, so
the C will collapse the if statement out, but it makes the code much
more readable.

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Acked-by: Alex Tomas <alex@clusterfs.com>
Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Singed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 11ce15d..750c46f 100644 (file)
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -376,7 +376,7 @@ ext4_ext_binsearch_idx(struct inode *inode, struct ext4_ext_path *path, int bloc
        ext_debug("binsearch for %d(idx):  ", block);
 
        l = EXT_FIRST_INDEX(eh) + 1;
-       r = EXT_FIRST_INDEX(eh) + le16_to_cpu(eh->eh_entries) - 1;
+       r = EXT_LAST_INDEX(eh);
        while (l <= r) {
                m = l + (r - l) / 2;
                if (block < le32_to_cpu(m->ei_block))
@@ -441,7 +441,7 @@ ext4_ext_binsearch(struct inode *inode, struct ext4_ext_path *path, int block)
        ext_debug("binsearch for %d:  ", block);
 
        l = EXT_FIRST_EXTENT(eh) + 1;
-       r = EXT_FIRST_EXTENT(eh) + le16_to_cpu(eh->eh_entries) - 1;
+       r = EXT_LAST_EXTENT(eh);
 
        while (l <= r) {
                m = l + (r - l) / 2;
@@ -924,8 +924,13 @@ static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode,
        curp->p_hdr->eh_max = cpu_to_le16(ext4_ext_space_root_idx(inode));
        curp->p_hdr->eh_entries = cpu_to_le16(1);
        curp->p_idx = EXT_FIRST_INDEX(curp->p_hdr);
-       /* FIXME: it works, but actually path[0] can be index */
-       curp->p_idx->ei_block = EXT_FIRST_EXTENT(path[0].p_hdr)->ee_block;
+
+       if (path[0].p_hdr->eh_depth)
+               curp->p_idx->ei_block =
+                       EXT_FIRST_INDEX(path[0].p_hdr)->ei_block;
+       else
+               curp->p_idx->ei_block =
+                       EXT_FIRST_EXTENT(path[0].p_hdr)->ee_block;
        ext4_idx_store_pblock(curp->p_idx, newblock);
 
        neh = ext_inode_hdr(inode);