Add support for a new inode flag, which is to be used
for indicating the top of directory hierarchies for the
Orlov block allocator.
diff --git a/lib/e2p/pf.c b/lib/e2p/pf.c
index a540c73..5edd690 100644
--- a/lib/e2p/pf.c
+++ b/lib/e2p/pf.c
@@ -40,6 +40,7 @@
{ EXT2_ECOMPR_FL, "E", "Compression_Error" },
{ EXT3_JOURNAL_DATA_FL, "j", "Journaled_Data" },
{ EXT2_NOTAIL_FL, "t", "No_Tailmerging" },
+ { EXT2_TOPDIR_FL, "T", "Top_of_Directory_Hierarchies" },
{ 0, NULL, NULL }
};
diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
index 7cd679d..4f32466 100644
--- a/lib/ext2fs/ext2_fs.h
+++ b/lib/ext2fs/ext2_fs.h
@@ -232,9 +232,10 @@
#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
#define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */
#define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */
+#define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
-#define EXT2_FL_USER_VISIBLE 0x0001DFFF /* User visible flags */
+#define EXT2_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
#define EXT2_FL_USER_MODIFIABLE 0x000080FF /* User modifiable flags */
/*
diff --git a/misc/chattr.1.in b/misc/chattr.1.in
index 218a291..1e17bd8 100644
--- a/misc/chattr.1.in
+++ b/misc/chattr.1.in
@@ -19,7 +19,7 @@
.B chattr
changes the file attributes on a Linux second extended file system.
.PP
-The format of a symbolic mode is +-=[ASacDdistu].
+The format of a symbolic mode is +-=[ASacDdisTtu].
.PP
The operator `+' causes the selected attributes to be added to the
existing attributes of the files; `-' causes them to be removed; and
@@ -28,7 +28,8 @@
The letters `ASacDdijsu' select the new attributes for the files:
don't update atime (A), synchronous updates (S), synchronous directory
updates (D), append only (a), compressed (c), no dump (d), immutable (i),
-data journalling (j), secure deletion (s), and undeletable (u).
+data journalling (j), secure deletion (s), top of directory hierarchy
+(T), no tail-merging (t), and undeletable (u).
.SH OPTIONS
.TP
.B \-R
@@ -85,6 +86,10 @@
the changes are written synchronously on the disk; this is equivalent to
the `sync' mount option applied to a subset of the files.
.PP
+A directory with the 'T' attribute will be deemed to be the top of
+directory hierarchies for the purposes of the Orlov block allocator
+(which is used in newer kernels).
+.PP
A file with the 't' attribute will not have a partial block fragment at
the of the file merged with other files (for those filesystems which
support tail-merging). This is necessary for applications such as LILO
diff --git a/misc/chattr.c b/misc/chattr.c
index 467e6ba..4ff1564 100644
--- a/misc/chattr.c
+++ b/misc/chattr.c
@@ -98,6 +98,7 @@
{ EXT2_SECRM_FL, 's' },
{ EXT2_UNRM_FL, 'u' },
{ EXT2_NOTAIL_FL, 't' },
+ { EXT2_TOPDIR_FL, 'T' },
{ 0, 0 }
};