[PATCH] ext3: add extent map support

On disk extents format:
/*
* this is extent on-disk structure
* it's used at the bottom of the tree
*/
struct ext3_extent {
__le32  ee_block;       /* first logical block extent covers */
__le16  ee_len;         /* number of blocks covered by extent */
__le16  ee_start_hi;    /* high 16 bits of physical block */
__le32  ee_start;       /* low 32 bigs of physical block */
};

Signed-off-by: Alex Tomas <alex@clusterfs.com>
Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 9 insertions, 1 deletions

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index f131bb69b62e..69f875250500 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -390,6 +390,7 @@ static void ext4_put_super (struct super_block * sb)
         struct ext4_super_block *es = sbi->s_es;
         int i;
 
+        ext4_ext_release(sb);
         ext4_xattr_put_super(sb);
         jbd2_journal_destroy(sbi->s_journal);
         if (!(sb->s_flags & MS_RDONLY)) {
@@ -454,6 +455,7 @@ static struct inode *ext4_alloc_inode(struct super_block *sb)
 #endif
         ei->i_block_alloc_info = NULL;
         ei->vfs_inode.i_version = 1;
+        memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
         return &ei->vfs_inode;
 }
 
@@ -677,7 +679,7 @@ enum {
         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
         Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
-        Opt_grpquota
+        Opt_grpquota, Opt_extents,
 };
 
 static match_table_t tokens = {
@@ -727,6 +729,7 @@ static match_table_t tokens = {
         {Opt_quota, "quota"},
         {Opt_usrquota, "usrquota"},
         {Opt_barrier, "barrier=%u"},
+        {Opt_extents, "extents"},
         {Opt_err, NULL},
         {Opt_resize, "resize"},
 };
@@ -1059,6 +1062,9 @@ clear_qf_name:
                 case Opt_bh:
                         clear_opt(sbi->s_mount_opt, NOBH);
                         break;
+                case Opt_extents:
+                        set_opt (sbi->s_mount_opt, EXTENTS);
+                        break;
                 default:
                         printk (KERN_ERR
                                 "EXT4-fs: Unrecognized mount option \"%s\" "
@@ -1787,6 +1793,8 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
                 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
                 "writeback");
 
+        ext4_ext_init(sb);
+
         lock_kernel();
         return 0;