ext4: Enable extent format for symlinks.

This patch enables extent-formatted normal symlinks.  Using extents
format allows a symlink to refer to a block number larger than 2^32
on large filesystems.  We still don't enable extent format for fast
symlinks, which are contained in the inode itself.

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>

2 files changed, 4 insertions, 2 deletions

diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 486e46a3918d..cb14646117f0 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -750,8 +750,8 @@ got:
                 goto fail_free_drop;
         }
         if (test_opt(sb, EXTENTS)) {
-                /* set extent flag only for directory and file */
-                if (S_ISDIR(mode) || S_ISREG(mode)) {
+                /* set extent flag only for diretory, file and normal symlink*/
+                if (S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode)) {
                         EXT4_I(inode)->i_flags |= EXT4_EXTENTS_FL;
                         ext4_ext_tree_init(handle, inode);
                         err = ext4_update_incompat_feature(handle, sb,
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 28aa2ed4297e..68611945687d 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2217,6 +2217,8 @@ retry:
                         goto out_stop;
                 }
         } else {
+                /* clear the extent format for fast symlink */
+                EXT4_I(inode)->i_flags &= ~EXT4_EXTENTS_FL;
                 inode->i_op = &ext4_fast_symlink_inode_operations;
                 memcpy((char*)&EXT4_I(inode)->i_data,symname,l);
                 inode->i_size = l-1;