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e2fsprogs
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Add support for a new inode flag, which is to be used 

for indicating the top of directory hierarchies for the
Orlov block allocator.
bitmap-optimize
Theodore Ts'o 2002-11-01 01:53:52 -05:00
parent 085d2a8397
commit 15f9011add
4 changed files with 11 additions and 3 deletions
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1
lib/e2p/pf.c
View File

@ -40,6 +40,7 @@ static struct flags_name flags_array[] = {
{ 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 }
};

3
lib/ext2fs/ext2_fs.h
View File

@ -232,9 +232,10 @@ struct ext2_dx_countlimit {
#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 */
/*

9
misc/chattr.1.in
View File

@ -19,7 +19,7 @@ chattr \- change file attributes on a Linux second extended file system
.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 @@ existing attributes of the files; `-' causes them to be removed; and
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 @@ When a file with the `S' attribute set is modified,
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

1
misc/chattr.c
View File

@ -98,6 +98,7 @@ static const struct flags_char flags_array[] = {
{ EXT2_SECRM_FL, 's' },
{ EXT2_UNRM_FL, 'u' },
{ EXT2_NOTAIL_FL, 't' },
{ EXT2_TOPDIR_FL, 'T' },
{ 0, 0 }
};