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[v3] Add largedir feature

Message ID 20170704175617.3mhx6koi3tebh72w@thunk.org
State Accepted, archived
Headers show

Commit Message

Theodore Ts'o July 4, 2017, 5:56 p.m. UTC 
On Sat, May 06, 2017 at 02:19:21PM -0400, Artem Blagodarenko wrote:
> From: Artem Blagodarenko <artem.blagodarenko@gmail.com>
> 
> This INCOMPAT_LARGEDIR feature allows larger directories to be created
> in ldiskfs, both with directory sizes over 2GB and and a maximum htree
> depth of 3 instead of the current limit of 2. These features are needed
> in order to exceed the current limit of approximately 10M entries in a
> single directory.
> 
> Signed-off-by: Yang Sheng <yang.sheng@intel.com>
> Signed-off-by: Artem Blagodarenko <artem.blagodarenko@seagate.com>

I'm going to fold the following minor fix-up to this patch before I
send it to Linus.

					- Ted
diff mbox

Patch

diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h
index f97611171023..5e61e464d71c 100644
--- a/fs/ext4/ext4_jbd2.h
+++ b/fs/ext4/ext4_jbd2.h
@@ -77,7 +77,14 @@ 
 
 #define EXT4_RESERVE_TRANS_BLOCKS	12U
 
-#define EXT4_INDEX_EXTRA_TRANS_BLOCKS	8
+/*
+ * Number of credits needed if we need to insert an entry into a
+ * directory.  For each new index block, we need 4 blocks (old index
+ * block, new index block, bitmap block, bg summary).  For normal
+ * htree directories there are 2 levels; if the largedir feature
+ * enabled it's 3 levels.
+ */
+#define EXT4_INDEX_EXTRA_TRANS_BLOCKS	12U
 
 #ifdef CONFIG_QUOTA
 /* Amount of blocks needed for quota update - we know that the structure was