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userns: Pass a userns parameter into posix_acl_to_xattr and posix_acl_from_xattr

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- Pass the user namespace the uid and gid values in the xattr are stored
   in into posix_acl_from_xattr.

 - Pass the user namespace kuid and kgid values should be converted into
   when storing uid and gid values in an xattr in posix_acl_to_xattr.

- Modify all callers of posix_acl_from_xattr and posix_acl_to_xattr to
  pass in &init_user_ns.

In the short term this change is not strictly needed but it makes the
code clearer.  In the longer term this change is necessary to be able to
mount filesystems outside of the initial user namespace that natively
store posix acls in the linux xattr format.

Cc: Theodore Tso <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Andreas Dilger <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: Al Viro <[email protected]>
Signed-off-by: "Eric W. Biederman" <[email protected]>
This commit is contained in:
Eric W. Biederman 2012-09-10 20:17:44 -07:00
commit 5f3a4a28ec
17 changed files with 53 additions and 49 deletions
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4
fs/ext2/acl.c
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@ -350,7 +350,7 @@ ext2_xattr_get_acl(struct dentry *dentry, const char *name, void *buffer,
return PTR_ERR(acl);
if (acl == NULL)
return -ENODATA;
error = posix_acl_to_xattr(acl, buffer, size);
error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
posix_acl_release(acl);
return error;
@ -371,7 +371,7 @@ ext2_xattr_set_acl(struct dentry *dentry, const char *name, const void *value,
return -EPERM;
if (value) {
acl = posix_acl_from_xattr(value, size);
acl = posix_acl_from_xattr(&init_user_ns, value, size);
if (IS_ERR(acl))
return PTR_ERR(acl);
else if (acl) {