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gfs2: Add trusted xattr support

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Add support for an additional filesystem version (sb_fs_format = 1802).
When a filesystem with the new version is mounted, the filesystem
supports "trusted.*" xattrs.

In addition, version 1802 filesystems implement a form of forward
compatibility for xattrs: when xattrs with an unknown prefix (ea_type)
are found on a version 1802 filesystem, those attributes are not shown
by listxattr, and they are not accessible by getxattr, setxattr, or
removexattr.

This mechanism might turn out to be what we need in the future, but if
not, we can always bump the filesystem version and break compatibility
instead.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Andrew Price <anprice@redhat.com>
This commit is contained in:
Andreas Gruenbacher
2021-02-05 17:10:18 +00:00
parent 47b7ec1daa
commit 866eef48d8
4 changed files with 63 additions and 8 deletions
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5
include/uapi/linux/gfs2_ondisk.h
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@@ -47,7 +47,7 @@
#define GFS2_FORMAT_DE 1200
#define GFS2_FORMAT_QU 1500
/* These are part of the superblock */
#define GFS2_FORMAT_FS 1801
#define GFS2_FORMAT_FS 1802
#define GFS2_FORMAT_MULTI 1900
/*
@@ -389,8 +389,9 @@ struct gfs2_leaf {
#define GFS2_EATYPE_USR 1
#define GFS2_EATYPE_SYS 2
#define GFS2_EATYPE_SECURITY 3
#define GFS2_EATYPE_TRUSTED 4
#define GFS2_EATYPE_LAST 3
#define GFS2_EATYPE_LAST 4
#define GFS2_EATYPE_VALID(x) ((x) <= GFS2_EATYPE_LAST)
#define GFS2_EAFLAG_LAST 0x01 /* last ea in block */