ext4: isolate ext4_extents.h file

After applied the commit (4a092d73), we have reduced the number of
source files that need to #include ext4_extents.h.  But we can do
better.

This commit defines ext4_zeroout_es() in extents.c and move
EXT_MAX_BLOCKS into ext4.h in order not to include ext4_extents.h in
indirect.c and ioctl.c.  Meanwhile we just need to include this file in
extent_status.c when ES_AGGRESSIVE_TEST is defined.  Otherwise, this
commit removes a duplicated declaration in trace/events/ext4.h.

After applied this patch, we just need to include ext4_extents.h file
in {super,migrate,move_extents,extents}.c, and it is easy for us to
define a new extent disk layout.

Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 19 insertions, 2 deletions

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 916e88498c87..54d52afcdb19 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3048,6 +3048,23 @@ void ext4_ext_release(struct super_block *sb)
 #endif
 }
 
+static int ext4_zeroout_es(struct inode *inode, struct ext4_extent *ex)
+{
+        ext4_lblk_t  ee_block;
+        ext4_fsblk_t ee_pblock;
+        unsigned int ee_len;
+
+        ee_block  = le32_to_cpu(ex->ee_block);
+        ee_len    = ext4_ext_get_actual_len(ex);
+        ee_pblock = ext4_ext_pblock(ex);
+
+        if (ee_len == 0)
+                return 0;
+
+        return ext4_es_insert_extent(inode, ee_block, ee_len, ee_pblock,
+                                     EXTENT_STATUS_WRITTEN);
+}
+
 /* FIXME!! we need to try to merge to left or right after zero-out  */
 static int ext4_ext_zeroout(struct inode *inode, struct ext4_extent *ex)
 {
@@ -3200,7 +3217,7 @@ static int ext4_split_extent_at(handle_t *handle,
                         goto fix_extent_len;
 
                 /* update extent status tree */
-                err = ext4_es_zeroout(inode, &zero_ex);
+                err = ext4_zeroout_es(inode, &zero_ex);
 
                 goto out;
         } else if (err)
@@ -3551,7 +3568,7 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
 out:
         /* If we have gotten a failure, don't zero out status tree */
         if (!err)
-                err = ext4_es_zeroout(inode, &zero_ex);
+                err = ext4_zeroout_es(inode, &zero_ex);
         return err ? err : allocated;
 }