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e2fsprogs
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On-disk format for large number of subdirectories 

- EXT4_FEATURE_RO_COMPAT_DIR_NLINK (0x0020?) - allow directories to have
  > 65000 subdirectories (i_nlinks) by setting i_nlinks = 1 for such
  directories.  RO_COMPAT protects old filesystems from unlinking such
  directories incorrectly and losing all files therein.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
bitmap-optimize
Theodore Ts'o 2006-11-11 09:43:42 -05:00
parent 8815fb8a00
commit bec6f49a46
2 changed files with 8 additions and 1 deletions
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6
lib/ext2fs/ChangeLog
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@ -1,5 +1,11 @@
2006-11-11 Theodore Tso <tytso@mit.edu>
* ext2_fs.h: Add definition of EXT4_FEATURE_RO_COMPAT_DIR_NLINK,
which allow directories to have > 65000 subdirectories
(i_nlinks) by setting i_nlinks = 1 for such directories.
RO_COMPAT protects old filesystems from unlinking such
directories incorrectly and losing all files therein.
* swapfs.c (ext2fs_swap_group_desc):
ext2_fs.h: Add definition of EXT4_FEATURE_RO_COMPAT_GDT_CSUM,
which adds a crc16 checksum in the group descriptor,

3
lib/ext2fs/ext2_fs.h
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@ -71,7 +71,7 @@
/*
* Maximal count of links to a file
*/
#define EXT2_LINK_MAX 32000
#define EXT2_LINK_MAX 65000
/*
* Macro-instructions used to manage several block sizes
@ -578,6 +578,7 @@ struct ext2_super_block {
/* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */
#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 EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002