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Commit ae812306 authored by Aditya Kali's avatar Aditya Kali Committed by Theodore Ts'o
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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: default avatarAditya Kali <adityakali@google.com>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent c5e06d10

fs/ext4/ext4.h

+3 −0
Original line number Diff line number Diff line
@@ -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 */
@@ -1344,6 +1346,7 @@ 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