linux-ext4 - [PATCH] ext4: reserve inodes and feature code for 'quota' feature

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Message-ID: <AANLkTinvSvUXNR-=pYTNp+dwLNFasuuXqfvVukVkw1qp@mail.gmail.com>
Date:	Mon, 14 Feb 2011 17:06:50 -0800
From:	Aditya Kali <adityakali@...gle.com>
To:	linux-ext4@...r.kernel.org, tytso@....edu
Subject: [PATCH] ext4: reserve inodes and feature code for 'quota' feature

I am working on patch to add quota as a built-in feature for ext4
filesystem. The implementation is based on the design given at
https://ext4.wiki.kernel.org/index.php/Design_For_1st_Class_Quota_in_Ext4.
This patch reserves the inode numbers 3 and 4 for quota purposes and
also reserves EXT4_FEATURE_RO_COMPAT_QUOTA feature code.

Signed-off-by: Aditya Kali <adityakali@...gle.com>
---
 fs/ext4/ext4.h |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 0c8d97b..127f76f 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -209,6 +209,8 @@ struct ext4_io_submit {
  */
 #define	EXT4_BAD_INO		 1	/* Bad blocks inode */
 #define EXT4_ROOT_INO		 2	/* Root inode */
+#define EXT4_USR_QUOTA_INO	 3	/* User quota inode */
+#define EXT4_GRP_QUOTA_INO	 4	/* Group quota inode */
 #define EXT4_BOOT_LOADER_INO	 5	/* Boot loader inode */
 #define EXT4_UNDEL_DIR_INO	 6	/* Undelete directory inode */
 #define EXT4_RESIZE_INO		 7	/* Reserved group descriptors inode */
@@ -1337,6 +1339,7 @@ static inline void ext4_clear_state_flags(struct
ext4_inode_info *ei)
 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM		0x0010
 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK	0x0020
 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE	0x0040
+#define EXT4_FEATURE_RO_COMPAT_QUOTA		0x0100

 #define EXT4_FEATURE_INCOMPAT_COMPRESSION	0x0001
 #define EXT4_FEATURE_INCOMPAT_FILETYPE		0x0002
-- 
1.7.3.1
--
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