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@google.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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@ -209,6 +209,8 @@ struct ext4_io_submit {
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*/
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#define EXT4_BAD_INO 1 /* Bad blocks inode */
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#define EXT4_ROOT_INO 2 /* Root inode */
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#define EXT4_USR_QUOTA_INO 3 /* User quota inode */
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#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
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#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
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#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
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#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
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@ -1344,6 +1346,7 @@ static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
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#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
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#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
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#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
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#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
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#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
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#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
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