linux-toradex.git/drivers/base/devtmpfs.c, branch v3.15-rc6

devtmpfs: Calling delete_path() only when necessary

2013-12-19T18:10:32+00:00

The deleted variable is always 1 in current code.
Initialize deleted variable to be 0, so delete_path() will be called only when
necessary.

Signed-off-by: Axel Lin 
Signed-off-by: Greg Kroah-Hartman

locks: break delegations on any attribute modification

2013-11-09T05:16:44+00:00

NFSv4 uses leases to guarantee that clients can cache metadata as well
as data.

Cc: Mikulas Patocka 
Cc: David Howells 
Cc: Tyler Hicks 
Cc: Dustin Kirkland 
Acked-by: Jeff Layton 
Signed-off-by: J. Bruce Fields 
Signed-off-by: Al Viro

locks: break delegations on unlink

2013-11-09T05:16:42+00:00

We need to break delegations on any operation that changes the set of
links pointing to an inode.  Start with unlink.

Such operations also hold the i_mutex on a parent directory.  Breaking a
delegation may require waiting for a timeout (by default 90 seconds) in
the case of a unresponsive NFS client.  To avoid blocking all directory
operations, we therefore drop locks before waiting for the delegation.
The logic then looks like:

	acquire locks
	...
	test for delegation; if found:
		take reference on inode
		release locks
		wait for delegation break
		drop reference on inode
		retry

It is possible this could never terminate.  (Even if we take precautions
to prevent another delegation being acquired on the same inode, we could
get a different inode on each retry.)  But this seems very unlikely.

The initial test for a delegation happens after the lock on the target
inode is acquired, but the directory inode may have been acquired
further up the call stack.  We therefore add a "struct inode **"
argument to any intervening functions, which we use to pass the inode
back up to the caller in the case it needs a delegation synchronously
broken.

Cc: David Howells 
Cc: Tyler Hicks 
Cc: Dustin Kirkland 
Acked-by: Jeff Layton 
Signed-off-by: J. Bruce Fields 
Signed-off-by: Al Viro

driver core: handle user namespaces properly with the uid/gid devtmpfs change

2013-04-11T18:43:29+00:00

Now that devtmpfs is caring about uid/gid, we need to use the correct
internal types so users who have USER_NS enabled will have things work
properly for them.

Thanks to Eric for pointing this out, and the patch review.

Reported-by: Eric W. Biederman 
Cc: Kay Sievers 
Cc: Ming Lei 
Signed-off-by: Greg Kroah-Hartman

driver core: devtmpfs: fix compile failure with CONFIG_UIDGID_STRICT_TYPE_CHECKS

2013-04-10T16:36:06+00:00

If CONFIG_UIDGID_STRICT_TYPE_CHECKS is enalbed, the below compile
failure will be triggered:

	drivers/base/devtmpfs.c: In function 'handle_create':
	drivers/base/devtmpfs.c:214:19: error: incompatible types when assigning to type 'kuid_t' from type 'uid_t'
	drivers/base/devtmpfs.c:215:19: error: incompatible types when assigning to type 'kgid_t' from type 'gid_t'
	make[2]: *** [drivers/base/devtmpfs.o] Error 1

This patch fixes the compile failure.

Signed-off-by: Ming Lei 
Cc: Kay Sievers 
Signed-off-by: Greg Kroah-Hartman

devtmpfs: add base.h include

2013-04-10T16:00:15+00:00

This fixes a sparse warning, and is a good idea given that the
devtmpfs_init() prototype is in this file.

Signed-off-by: Greg Kroah-Hartman

driver core: add uid and gid to devtmpfs

2013-04-08T15:21:48+00:00

Some drivers want to tell userspace what uid and gid should be used for
their device nodes, so allow that information to percolate through the
driver core to userspace in order to make this happen.  This means that
some systems (i.e.  Android and friends) will not need to even run a
udev-like daemon for their device node manager and can just rely in
devtmpfs fully, reducing their footprint even more.

Signed-off-by: Kay Sievers 
Signed-off-by: Greg Kroah-Hartman

switch vfs_getattr() to struct path

2013-02-26T07:46:08+00:00

Signed-off-by: Al Viro

vfs: turn is_dir argument to kern_path_create into a lookup_flags arg

2012-12-20T23:50:02+00:00

Where we can pass in LOOKUP_DIRECTORY or LOOKUP_REVAL. Any other flags
passed in here are currently ignored.

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

userns: Convert devtmpfs to use GLOBAL_ROOT_UID and GLOBAL_ROOT_GID

2012-09-21T10:13:05+00:00

Acked-by: Greg Kroah-Hartman 
Acked-by: Serge Hallyn 
Signed-off-by: Eric W. Biederman