Comments? - Ted On-disk format for controlling the inode size - EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE (0x0040?) - add s_min_extra_isize and s_want_extra_isize fields to superblock, which allow specifying the minimum and desired i_extra_isize fields in large inodes (for nsec+epoch timestamps, potential other uses). Needs RO_COMPAT flag handling, needs e2fsck support, patch complete, little testing. Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx> Index: e2fsprogs/lib/ext2fs/ext2_fs.h =================================================================== --- e2fsprogs.orig/lib/ext2fs/ext2_fs.h 2006-10-18 01:49:51.000000000 -0400 +++ e2fsprogs/lib/ext2fs/ext2_fs.h 2006-10-18 02:07:35.000000000 -0400 @@ -298,7 +298,7 @@ __u16 i_uid; /* Low 16 bits of Owner Uid */ __u32 i_size; /* Size in bytes */ __u32 i_atime; /* Access time */ - __u32 i_ctime; /* Creation time */ + __u32 i_ctime; /* Inode Change time */ __u32 i_mtime; /* Modification time */ __u32 i_dtime; /* Deletion Time */ __u16 i_gid; /* Low 16 bits of Group Id */ @@ -356,7 +356,7 @@ __u16 i_uid; /* Low 16 bits of Owner Uid */ __u32 i_size; /* Size in bytes */ __u32 i_atime; /* Access time */ - __u32 i_ctime; /* Creation time */ + __u32 i_ctime; /* Inode Change time */ __u32 i_mtime; /* Modification time */ __u32 i_dtime; /* Deletion Time */ __u16 i_gid; /* Low 16 bits of Group Id */ @@ -405,6 +405,11 @@ } osd2; /* OS dependent 2 */ __u16 i_extra_isize; __u16 i_pad1; + __u32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ + __u32 i_mtime_extra; /* extra Mod. time (nsec << 2 | epoch) */ + __u32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ + __u32 i_crtime; /* File creation time */ + __u32 i_crtime_extra; /* extra File creation time (nsec << 2 | epoch)*/ }; #define i_size_high i_dir_acl @@ -554,7 +559,9 @@ __u32 s_blocks_count_hi; /* Blocks count high 32bits */ __u32 s_r_blocks_count_hi; /* Reserved blocks count high 32 bits*/ __u32 s_free_blocks_hi; /* Free blocks count */ - __u32 s_reserved[169]; /* Padding to the end of the block */ + __u16 s_min_extra_isize; /* All inodes have at least # bytes */ + __u16 s_want_extra_isize; /* New inodes should reserve # bytes */ + __u32 s_reserved[168]; /* Padding to the end of the block */ }; /* @@ -607,6 +614,7 @@ #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 #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 EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
