]> git.baikalelectronics.ru Git - kernel.git/commit
VFS: Reorder vfs_getxattr to avoid unnecessary calls to the LSM
authorDavid P. Quigley <dpquigl@tycho.nsa.gov>
Tue, 5 Feb 2008 06:29:40 +0000 (22:29 -0800)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Tue, 5 Feb 2008 17:44:20 +0000 (09:44 -0800)
commit3b0b9167f29073d6410a5c9a8593d1a851cd8050
tree50df31f6b7e8d38ac0988a523e331babb6462216
parentbca7f52d50a8aff6dcc89dcb15d4063af1a75da0
VFS: Reorder vfs_getxattr to avoid unnecessary calls to the LSM

Originally vfs_getxattr would pull the security xattr variable using
the inode getxattr handle and then proceed to clobber it with a subsequent call
to the LSM.

This patch reorders the two operations such that when the xattr requested is
in the security namespace it first attempts to grab the value from the LSM
directly.

If it fails to obtain the value because there is no module present or the
module does not support the operation it will fall back to using the inode
getxattr operation.

In the event that both are inaccessible it returns EOPNOTSUPP.

Signed-off-by: David P. Quigley <dpquigl@tycho.nsa.gov>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: Chris Wright <chrisw@sous-sol.org>
Acked-by: James Morris <jmorris@namei.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Cc: Casey Schaufler <casey@schaufler-ca.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/xattr.c