Reserve the EXT4_FEATURE_INCOMPAT_INLINEDATA feature flag for use
with storing small file data in the i_blocks field (up to 60 bytes)
and/or the large xattr space (after i_extra_isize, up to the large
inode size). On typical filesystems this can save 1-3% of the space,
and more importantly it also avoids seeking to read the data block.
This will become increasingly important with bigalloc filesystems,
since they consume a full cluster of blocks for each file, including
small directories that could easily fit into the inode itself.
Signed-off-by: Andreas Dilger <adilger@xxxxxxxxxxxxx>
Originally-by: Tao Ma <tm@xxxxxx>
---
lib/ext2fs/ext2_fs.h | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
index 0f8cde8..6cf47f9 100644
--- a/lib/ext2fs/ext2_fs.h
+++ b/lib/ext2fs/ext2_fs.h
@@ -719,6 +719,7 @@ struct ext2_super_block {
#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400
#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000
+#define EXT4_FEATURE_INCOMPAT_INLINEDATA 0x2000 /* data in inode */
#define EXT2_FEATURE_COMPAT_SUPP 0
#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \
--
1.7.2
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