linux-toradex.git/fs/xattr.c, branch v4.4.32

9p: xattr simplifications

2015-11-14T01:34:33+00:00

Now that the xattr handler is passed to the xattr handler operations, we
can use the same get and set operations for the user, trusted, and security
xattr namespaces.  In those namespaces, we can access the full attribute
name by "reattaching" the name prefix the vfs has skipped for us.  Add a
xattr_full_name helper to make this obvious in the code.

For the "system.posix_acl_access" and "system.posix_acl_default"
attributes, handler->prefix is the full attribute name; the suffix is the
empty string.

Signed-off-by: Andreas Gruenbacher 
Cc: Eric Van Hensbergen 
Cc: Ron Minnich 
Cc: Latchesar Ionkov 
Cc: v9fs-developer@lists.sourceforge.net
Signed-off-by: Al Viro

xattr handlers: Pass handler to operations instead of flags

2015-11-14T01:34:32+00:00

The xattr_handler operations are currently all passed a file system
specific flags value which the operations can use to disambiguate between
different handlers; some file systems use that to distinguish the xattr
namespace, for example.  In some oprations, it would be useful to also have
access to the handler prefix.  To allow that, pass a pointer to the handler
to operations instead of the flags value alone.

Signed-off-by: Andreas Gruenbacher 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Al Viro

evm: fix potential race when removing xattrs

2015-05-21T17:28:47+00:00

EVM needs to be atomically updated when removing xattrs.
Otherwise concurrent EVM verification may fail in between.
This patch fixes by moving i_mutex unlocking after calling
EVM hook. fsnotify_xattr() is also now called while locked
the same way as it is done in __vfs_setxattr_noperm.

Changelog:
- remove unused 'inode' variable.

Signed-off-by: Dmitry Kasatkin 
Signed-off-by: Mimi Zohar

new helper: audit_file()

2014-11-19T18:01:26+00:00

... for situations when we don't have any candidate in pathnames - basically,
in descriptor-based syscalls.

[Folded the build fix for !CONFIG_AUDITSYSCALL configs from Chen Gang]

Signed-off-by: Al Viro

vfs: Deduplicate code shared by xattr system calls operating on paths

2014-10-12T21:09:10+00:00

The following pairs of system calls dealing with extended attributes only
differ in their behavior on whether the symbolic link is followed (when
the named file is a symbolic link):

- setxattr() and lsetxattr()
- getxattr() and lgetxattr()
- listxattr() and llistxattr()
- removexattr() and lremovexattr()

Despite this, the implementations all had duplicated code, so this commit
redirects each of the above pairs of system calls to a corresponding
function to which different lookup flags (LOOKUP_FOLLOW or 0) are passed.

For me this reduced the stripped size of xattr.o from 8824 to 8248 bytes.

Signed-off-by: Eric Biggers 
Signed-off-by: Al Viro

simple_xattr: permit 0-size extended attributes

2014-07-23T22:10:55+00:00

If a filesystem uses simple_xattr to support user extended attributes,
LTP setxattr01 and xfstests generic/062 fail with "Cannot allocate
memory": simple_xattr_alloc()'s wrap-around test mistakenly excludes
values of zero size.  Fix that off-by-one (but apparently no filesystem
needs them yet).

Signed-off-by: Hugh Dickins 
Cc: Al Viro 
Cc: Jeff Layton 
Cc: Aristeu Rozanski 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

vfs: make lremovexattr retry once on ESTALE error

2012-12-20T23:50:11+00:00

Signed-off-by: Jeff Layton 
Signed-off-by: Al Viro

vfs: make removexattr retry once on ESTALE

2012-12-20T23:50:10+00:00

Signed-off-by: Jeff Layton 
Signed-off-by: Al Viro

vfs: make llistxattr retry once on ESTALE error

2012-12-20T23:50:10+00:00

Signed-off-by: Jeff Layton 
Signed-off-by: Al Viro

vfs: make listxattr retry once on ESTALE error

2012-12-20T23:50:10+00:00

Signed-off-by: Jeff Layton 
Signed-off-by: Al Viro