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ext4: reserve xattr index for the Hurd

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The Hurd is using inode fields which restricts it from using more
advanced ext4 file system features, due to design choices made over a
decade ago.  By giving the Hurd an extended attribute index field we
allow it to move the translator and author fields out of the core
inode fields, and hopefully we can get rid of ugly hacks such as
EXT4_OS_HURD and EXT4_MOUNT2_HURD_COMPAT somday.

For more information please see:
      https://summerofcode.withgoogle.com/projects/#5869799859027968

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2016-07-31 23:38:36 -04:00
parent 7bc9491645
commit 3980bd3b40
1 changed files with 1 additions and 0 deletions
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fs/ext4/xattr.h
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@ -24,6 +24,7 @@
#define EXT4_XATTR_INDEX_SYSTEM 7
#define EXT4_XATTR_INDEX_RICHACL 8
#define EXT4_XATTR_INDEX_ENCRYPTION 9
#define EXT4_XATTR_INDEX_HURD 10 /* Reserved for Hurd */
struct ext4_xattr_header {
__le32 h_magic; /* magic number for identification */