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| author | Artem Blagodarenko <artem.blagodarenko@gmail.com> | 2017-06-21 21:09:57 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2017-06-21 21:09:57 -0400 |
| commit | e08ac99fa2a25626f573cfa377ef3ddedf2cfe8f (patch) | |
| tree | f8d44249cdc7a8405a7a73344a7dc45b5a2455c3 /fs/ext4/ext4_jbd2.h | |
| parent | 67a7d5f561f469ad2fa5154d2888258ab8e6df7c (diff) | |
ext4: add largedir feature
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>
Diffstat (limited to 'fs/ext4/ext4_jbd2.h')
| -rw-r--r-- | fs/ext4/ext4_jbd2.h | 9 |
1 files changed, 8 insertions, 1 deletions
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 |