pm24.git/fs/afs, branch v3.15

AFS: Pass an afs_call* to call->async_workfn() instead of a work_struct*

2014-05-23T12:05:22Z

call->async_workfn() can take an afs_call* arg rather than a work_struct* as the functions assigned there are now called from afs_async_workfn() which has to call container_of() anyway. Signed-off-by: David Howells Reviewed-by: Nathaniel Wesley Filardo Reviewed-by: Tejun Heo

AFS: Fix kafs module unloading

2014-05-23T12:05:22Z

At present, it is not possible to successfully unload the kafs module if there are outstanding async outgoing calls (those made with afs_make_call()). This appears to be due to the changes introduced by: commit 059499453a9abd1857d442b44da8b4c126dc72a8 Author: Tejun Heo Date: Fri Mar 7 10:24:50 2014 -0500 Subject: afs: don't use PREPARE_WORK which didn't go far enough. The problem is due to: (1) The aforementioned commit introduced a separate handler function pointer in the call, call->async_workfn, in addition to the original workqueue item, call->async_work, for asynchronous operations because workqueues subsystem cannot handle the workqueue item pointer being changed whilst the item is queued or being processed. (2) afs_async_workfn() was introduced in that commit to be the callback for call->async_work. Its sole purpose is to run whatever call->async_workfn points to. (3) call->async_workfn is only used from afs_async_workfn(), which is only set on async_work by afs_collect_incoming_call() - ie. for incoming calls. (4) call->async_workfn is *not* set by afs_make_call() when outgoing calls are made, and call->async_work is set afs_process_async_call() - and not afs_async_workfn(). (5) afs_process_async_call() now changes call->async_workfn rather than call->async_work to point to afs_delete_async_call() to clean up, but this is only effective for incoming calls because call->async_work does not point to afs_async_workfn() for outgoing calls. (6) Because, for incoming calls, call->async_work remains pointing to afs_process_async_call() this results in an infinite loop. Instead, make the workqueue uniformly vector through call->async_workfn, via afs_async_workfn() and simply initialise call->async_workfn to point to afs_process_async_call() in afs_make_call(). Signed-off-by: Nathaniel Wesley Filardo Signed-off-by: David Howells Reviewed-by: Tejun Heo

AFS: Part of afs_end_call() is identical to code elsewhere, so split it

2014-05-23T12:05:15Z

Split afs_end_call() into two pieces, one of which is identical to code in afs_process_async_call(). Replace the latter with a call to the first part of afs_end_call(). Signed-off-by: Nathaniel Wesley Filardo Signed-off-by: David Howells

AFS: Fix cache manager service handlers

2014-05-21T13:48:05Z

Fix the cache manager RPC service handlers. The afs_send_empty_reply() and afs_send_simple_reply() functions: (a) Kill the call and free up the buffers associated with it if they fail. (b) Return with call intact if it they succeed. However, none of the callers actually check the result or clean up if successful - and may use the now non-existent data if it fails. This was detected by Dan Carpenter using a static checker: The patch 08e0e7c82eea: "[AF_RXRPC]: Make the in-kernel AFS filesystem use AF_RXRPC." from Apr 26, 2007, leads to the following static checker warning: "fs/afs/cmservice.c:155 SRXAFSCB_CallBack() warn: 'call' was already freed." Reported-by: Dan Carpenter Signed-off-by: David Howells

mm + fs: store shadow entries in page cache

2014-04-03T23:21:01Z

Reclaim will be leaving shadow entries in the page cache radix tree upon evicting the real page. As those pages are found from the LRU, an iput() can lead to the inode being freed concurrently. At this point, reclaim must no longer install shadow pages because the inode freeing code needs to ensure the page tree is really empty. Add an address_space flag, AS_EXITING, that the inode freeing code sets under the tree lock before doing the final truncate. Reclaim will check for this flag before installing shadow pages. Signed-off-by: Johannes Weiner Reviewed-by: Rik van Riel Reviewed-by: Minchan Kim Cc: Andrea Arcangeli Cc: Bob Liu Cc: Christoph Hellwig Cc: Dave Chinner Cc: Greg Thelen Cc: Hugh Dickins Cc: Jan Kara Cc: KOSAKI Motohiro Cc: Luigi Semenzato Cc: Mel Gorman Cc: Metin Doslu Cc: Michel Lespinasse Cc: Ozgun Erdogan Cc: Peter Zijlstra Cc: Roman Gushchin Cc: Ryan Mallon Cc: Tejun Heo Cc: Vlastimil Babka Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

afs: don't use PREPARE_WORK

2014-03-07T15:24:50Z

PREPARE_[DELAYED_]WORK() are being phased out. They have few users and a nasty surprise in terms of reentrancy guarantee as workqueue considers work items to be different if they don't have the same work function. afs_call->async_work is multiplexed with multiple work functions. Introduce afs_async_workfn() which invokes afs_call->async_workfn and always use it as the work function and update the users to set the ->async_workfn field instead of overriding the work function using PREPARE_WORK(). It would probably be best to route this with other related updates through the workqueue tree. Compile tested. Signed-off-by: Tejun Heo Cc: David Howells Cc: linux-afs@lists.infradead.org

afs: proc cells and rootcell are writeable

2014-02-01T18:59:39Z

Both proc files are writeable and used for configuring cells. But there is missing correct mode flag for writeable files. Without this patch both proc files are read only. [ It turns out they aren't really read-only, since root can write to them even if the write bit isn't set due to CAP_DAC_OVERRIDE ] Signed-off-by: Pali Rohár Signed-off-by: David Howells Signed-off-by: Linus Torvalds

afs: get rid of junk in fs/afs/proc.c

2014-01-25T08:14:06Z

kill pointless method instances and don't bother with ->owner - it's ignored for procfs files anyway, make use of remove_proc_subtree() for removal, get rid of cell->proc_dir. Signed-off-by: Al Viro

Merge branch 'fscache' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs into linux-next

2013-10-28T23:36:46Z

Pull fs-cache fixes from David Howells: Can you pull these commits to fix an issue with NFS whereby caching can be enabled on a file that is open for writing by subsequently opening it for reading. This can be made to crash by opening it for writing again if you're quick enough. The gist of the patchset is that the cookie should be acquired at inode creation only and subsequently enabled and disabled as appropriate (which dispenses with the backing objects when they're not needed). The extra synchronisation that NFS does can then be dispensed with as it is thenceforth managed by FS-Cache. Could you send these on to Linus? This likely will need fixing also in CIFS and 9P also once the FS-Cache changes are upstream. AFS and Ceph are probably safe. * 'fscache' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs: NFS: Use i_writecount to control whether to get an fscache cookie in nfs_open() FS-Cache: Provide the ability to enable/disable cookies FS-Cache: Add use/unuse/wake cookie wrappers

afs: dget_parent() can't return a negative dentry

2013-09-30T02:02:24Z

Signed-off-by: Al Viro