ext4: use ext4_get_group_desc()

Use ext4_get_group_desc() in ext4_get_inode_block() instead of open
coding the functionality.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: adilger@clusterfs.com
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Mingming Cao <cmm@us.ibm.com>

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 24a2604..aa0fb98 100644 (file)
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2511,12 +2511,10 @@ out_stop:
 static ext4_fsblk_t ext4_get_inode_block(struct super_block *sb,
                unsigned long ino, struct ext4_iloc *iloc)
 {
-       unsigned long desc, group_desc;
        ext4_group_t block_group;
        unsigned long offset;
        ext4_fsblk_t block;
-       struct buffer_head *bh;
-       struct ext4_group_desc * gdp;
+       struct ext4_group_desc *gdp;
 
        if (!ext4_valid_inum(sb, ino)) {
                /*
@@ -2528,22 +2526,10 @@ static ext4_fsblk_t ext4_get_inode_block(struct super_block *sb,
        }
 
        block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb);
-       if (block_group >= EXT4_SB(sb)->s_groups_count) {
-               ext4_error(sb,"ext4_get_inode_block","group >= groups count");
+       gdp = ext4_get_group_desc(sb, block_group, NULL);
+       if (!gdp)
                return 0;
-       }
-       smp_rmb();
-       group_desc = block_group >> EXT4_DESC_PER_BLOCK_BITS(sb);
-       desc = block_group & (EXT4_DESC_PER_BLOCK(sb) - 1);
-       bh = EXT4_SB(sb)->s_group_desc[group_desc];
-       if (!bh) {
-               ext4_error (sb, "ext4_get_inode_block",
-                           "Descriptor not loaded");
-               return 0;
-       }
 
-       gdp = (struct ext4_group_desc *)((__u8 *)bh->b_data +
-               desc * EXT4_DESC_SIZE(sb));
        /*
         * Figure out the offset within the block group inode table
         */