->permission() of its own is a rudiment of sysctl imitation;
normal procfs logics will do just fine here, no need to
mess with ->proc_iops at all.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
this "hooks" scheme is pointless - just make file_operations non-static
and consolidate initialiazation bits.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
proc_create() has shat upon fops argument when mode is S_IFDIR.
Good thing, too, since fops passed to it is completely useless
for any directory. Just use proc_mkdir(), damnit.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
The procfs debug code in rtl_debug.c is, ironically, very buggy: it lacks proper locking.
Since the most useful part of the code (the stats) are available through more
standard APIs, I think it is best to just delete the whole mess.
Signed-off-by: Sean MacLennan <seanm@seanm.ca>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
filesystem module as whole is pinned down by its superblock, no need
to have opened files on it to add anything to that.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
filesystem module as whole is pinned down by its superblock, no need
to have opened files on it to add anything to that.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
filesystem module as whole is pinned down by its superblock, no need
to have opened files on it to add anything to that.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
it's used only as a flag to distinguish normal pipes/FIFOs from the
internal per-task one used by file-to-file splice. And pipe->files
would work just as well for that purpose...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
fs/pipe.c file_operations methods *know* that pipe is not an internal one;
no need to check pipe->inode for those callers.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* new field - pipe->files; number of struct file over that pipe (all
sharing the same inode, of course); protected by inode->i_lock.
* pipe_release() decrements pipe->files, clears inode->i_pipe when
if the counter has reached 0 (all under ->i_lock) and, in that case,
frees pipe after having done pipe_unlock()
* fifo_open() starts with grabbing ->i_lock, and either bumps pipe->files
if ->i_pipe was non-NULL or allocates a new pipe (dropping and regaining
->i_lock) and rechecks ->i_pipe; if it's still NULL, inserts new pipe
there, otherwise bumps ->i_pipe->files and frees the one we'd allocated.
At that point we know that ->i_pipe is non-NULL and won't go away, so
we can do pipe_lock() on it and proceed as we used to. If we end up
failing, decrement pipe->files and if it reaches 0 clear ->i_pipe and
free the sucker after pipe_unlock().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* use the fact that file_inode(file)->i_pipe doesn't change
while the file is opened - no locks needed to access that.
* switch to pipe_lock/pipe_unlock where it's easy to do
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
... and provide namespace_lock() as a trivial wrapper;
switch to those two consistently.
Result is patterned after rtnl_lock/rtnl_unlock pair.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
global list of release_mounts() fodder, protected by namespace_sem;
eventually, all umount_tree() callers will use it as kill list.
Helper picking the contents of that list, releasing namespace_sem
and doing release_mounts() on what it got.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
