[v4 5/6] Add inherit flags for project quota

[Li Xi <pkuelelixi@gmail.com>]

This patch add EXT4_PROJINHERIT_FL to enable inherit feature for
project ID. If an directory has its inherit flag set, all its
newly created children will inherit its project ID. Conversely,
new inodes will get a default project ID (i.e. zero). Also, no
hard link or rename is permitted if the directory and child has
different project ID.

Signed-off-by: Li Xi <lixi@ddn.com>
Signed-off-by: Wang Shilong <wshilong@ddn.com>
---
 lib/e2p/pf.c         |    1 +
 lib/ext2fs/ext2_fs.h |    5 +++--
 misc/chattr.c        |    3 ++-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/lib/e2p/pf.c b/lib/e2p/pf.c
index 8961727..27421a6 100644
--- a/lib/e2p/pf.c
+++ b/lib/e2p/pf.c
@@ -46,6 +46,7 @@ static struct flags_name flags_array[] = {
 	{ EXT4_HUGE_FILE_FL, "h", "Huge_file" },
 	{ FS_NOCOW_FL, "C", "No_COW" },
 	{ EXT4_INLINE_DATA_FL, "N", "Inline_Data" },
+	{ EXT4_PROJINHERIT_FL, "P", "Project_Iherit" },
 	{ 0, NULL, NULL }
 };
 
diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
index fa3b309..d16dd80 100644
--- a/lib/ext2fs/ext2_fs.h
+++ b/lib/ext2fs/ext2_fs.h
@@ -326,10 +326,11 @@ struct ext2_dx_tail {
 #define EXT4_SNAPFILE_DELETED_FL	0x04000000  /* Snapshot is being deleted */
 #define EXT4_SNAPFILE_SHRUNK_FL		0x08000000  /* Snapshot shrink has completed */
 #define EXT4_INLINE_DATA_FL		0x10000000 /* Inode has inline data */
+#define EXT4_PROJINHERIT_FL		0x20000000 /* Create with parents projid */
 #define EXT2_RESERVED_FL		0x80000000 /* reserved for ext2 lib */
 
-#define EXT2_FL_USER_VISIBLE		0x004BDFFF /* User visible flags */
-#define EXT2_FL_USER_MODIFIABLE		0x004B80FF /* User modifiable flags */
+#define EXT2_FL_USER_VISIBLE		0x204BDFFF /* User visible flags */
+#define EXT2_FL_USER_MODIFIABLE		0x204B80FF /* User modifiable flags */
 
 /*
  * ioctl commands
diff --git a/misc/chattr.c b/misc/chattr.c
index e55d693..40069c9 100644
--- a/misc/chattr.c
+++ b/misc/chattr.c
@@ -83,7 +83,7 @@ static unsigned long sf;
 static void usage(void)
 {
 	fprintf(stderr,
-		_("Usage: %s [-RVf] [-+=aAcCdDeijsStTu] [-v version] files...\n"),
+		_("Usage: %s [-RVf] [-+=aAcCdDeijPsStTu] [-v version] files...\n"),
 		program_name);
 	exit(1);
 }
@@ -103,6 +103,7 @@ static const struct flags_char flags_array[] = {
 	{ EXT4_EXTENTS_FL, 'e'},
 	{ EXT2_IMMUTABLE_FL, 'i' },
 	{ EXT3_JOURNAL_DATA_FL, 'j' },
+	{ EXT4_PROJINHERIT_FL, 'P' },
 	{ EXT2_SECRM_FL, 's' },
 	{ EXT2_UNRM_FL, 'u' },
 	{ EXT2_NOTAIL_FL, 't' },
-- 
1.7.1