ext4: Get journal write access before modifying the extent tree

When the user was writing into an unitialized extent,
ext4_ext_convert_to_initialize() was not requesting journal write access
before it started to modify the extent tree.   Fix this oversight.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 8 insertions, 3 deletions

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 995ac16102a9..c4d6f19faf37 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -2168,6 +2168,10 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
         newblock = iblock - ee_block + ext_pblock(ex);
         ex2 = ex;
 
+        err = ext4_ext_get_access(handle, inode, path + depth);
+        if (err)
+                goto out;
+
         /* ex1: ee_block to iblock - 1 : uninitialized */
         if (iblock > ee_block) {
                 ex1 = ex;
@@ -2210,6 +2214,10 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
                         ex = path[depth].p_ext;
                         if (ex2 != &newex)
                                 ex2 = ex;
+
+                        err = ext4_ext_get_access(handle, inode, path + depth);
+                        if (err)
+                                goto out;
                 }
                 allocated = max_blocks;
         }
@@ -2230,9 +2238,6 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
         ex2->ee_len = cpu_to_le16(allocated);
         if (ex2 != ex)
                 goto insert;
-        err = ext4_ext_get_access(handle, inode, path + depth);
-        if (err)
-                goto out;
         /*
          * New (initialized) extent starts from the first block
          * in the current extent. i.e., ex2 == ex