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ext4: add largedir feature

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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.

This patch was originally written by Yang Sheng to support the Lustre server.

[ Bumped the credits needed to update an indexed directory -- tytso ]

Signed-off-by: Liang Zhen <liang.zhen@intel.com>
Signed-off-by: Yang Sheng <yang.sheng@intel.com>
Signed-off-by: Artem Blagodarenko <artem.blagodarenko@seagate.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
This commit is contained in:
Artem Blagodarenko
2017-06-21 21:09:57 -04:00
committed by Theodore Ts'o
parent 67a7d5f561
commit e08ac99fa2
4 changed files with 113 additions and 47 deletions
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9
fs/ext4/ext4_jbd2.h
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@@ -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