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  1. 18 12月, 2012 1 次提交
  3. 09 10月, 2012 1 次提交
    • K
      mm: kill vma flag VM_CAN_NONLINEAR · 0b173bc4
      由 Konstantin Khlebnikov 提交于 
      Move actual pte filling for non-linear file mappings into the new special
vma operation: ->remap_pages().

Filesystems must implement this method to get non-linear mapping support,
if it uses filemap_fault() then generic_file_remap_pages() can be used.

Now device drivers can implement this method and obtain nonlinear vma support.
Signed-off-by: NKonstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Carsten Otte <cotte@de.ibm.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>	#arch/tile
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Eric Paris <eparis@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Morris <james.l.morris@oracle.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Kentaro Takeda <takedakn@nttdata.co.jp>
Cc: Matt Helsley <matthltc@us.ibm.com>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Venkatesh Pallipadi <venki@google.com>
Acked-by: NLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      0b173bc4
  5. 07 8月, 2012 1 次提交
    • Z
      fuse: verify all ioctl retry iov elements · fb6ccff6
      由 Zach Brown 提交于 
      Commit 7572777e attempted to verify that
the total iovec from the client doesn't overflow iov_length() but it
only checked the first element.  The iovec could still overflow by
starting with a small element.  The obvious fix is to check all the
elements.

The overflow case doesn't look dangerous to the kernel as the copy is
limited by the length after the overflow.  This fix restores the
intention of returning an error instead of successfully copying less
than the iovec represented.

I found this by code inspection.  I built it but don't have a test case.
I'm cc:ing stable because the initial commit did as well.
Signed-off-by: NZach Brown <zab@redhat.com>
Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz>
CC: <stable@vger.kernel.org>         [2.6.37+]
      fb6ccff6
  7. 31 7月, 2012 1 次提交
  9. 18 7月, 2012 1 次提交
    • B
      fuse: update attributes on aio_read · a8894274
      由 Brian Foster 提交于 
      A fuse-based network filesystem might allow for the inode
and/or file data to change unexpectedly. A local client
that opens and repeatedly reads a file might never pick
up on such changes and indefinitely return stale data.

Always invoke fuse_update_attributes() in the read path
to cause an attr revalidation when the attributes expire.
This leads to a page cache invalidation if necessary and
ensures fuse issues new read requests to the fuse client.

The original logic (reval only on reads beyond EOF) is
preserved unless the client specifies FUSE_AUTO_INVAL_DATA
on init.
Signed-off-by: NBrian Foster <bfoster@redhat.com>
Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz>
      a8894274
  11. 02 6月, 2012 1 次提交
    • J
      fs: introduce inode operation ->update_time · c3b2da31
      由 Josef Bacik 提交于 
      Btrfs has to make sure we have space to allocate new blocks in order to modify
the inode, so updating time can fail.  We've gotten around this by having our
own file_update_time but this is kind of a pain, and Christoph has indicated he
would like to make xfs do something different with atime updates.  So introduce
->update_time, where we will deal with i_version an a/m/c time updates and
indicate which changes need to be made.  The normal version just does what it
has always done, updates the time and marks the inode dirty, and then
filesystems can choose to do something different.

I've gone through all of the users of file_update_time and made them check for
errors with the exception of the fault code since it's complicated and I wasn't
quite sure what to do there, also Jan is going to be pushing the file time
updates into page_mkwrite for those who have it so that should satisfy btrfs and
make it not a big deal to check the file_update_time() return code in the
generic fault path. Thanks,
Signed-off-by: NJosef Bacik <josef@redhat.com>
      c3b2da31
  13. 26 4月, 2012 1 次提交
  15. 25 4月, 2012 1 次提交
  17. 20 3月, 2012 1 次提交
  19. 05 3月, 2012 1 次提交
    • A
      fuse: O_DIRECT support for files · 4273b793
      由 Anand Avati 提交于 
      Implement ->direct_IO() method in aops. The ->direct_IO() method combines
the existing fuse_direct_read/fuse_direct_write methods to implement
O_DIRECT functionality.

Reaching ->direct_IO() in the read path via generic_file_aio_read ensures
proper synchronization with page cache with its existing framework.

Reaching ->direct_IO() in the write path via fuse_file_aio_write is made
to come via generic_file_direct_write() which makes it play nice with
the page cache w.r.t other mmap pages etc.

On files marked 'direct_io' by the filesystem server, IO always follows
the fuse_direct_read/write path. There is no effect of fcntl(O_DIRECT)
and it always succeeds.

On files not marked with 'direct_io' by the filesystem server, the IO
path depends on O_DIRECT flag by the application. This can be passed
at the time of open() as well as via fcntl().

Note that asynchronous O_DIRECT iocb jobs are completed synchronously
always (this has been the case with FUSE even before this patch)
Signed-off-by: NAnand Avati <avati@redhat.com>
Reviewed-by: NJeff Moyer <jmoyer@redhat.com>
Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz>
      4273b793
  21. 13 12月, 2011 5 次提交
  23. 08 8月, 2011 3 次提交
    • J
      fuse: mark pages accessed when written to · 478e0841
      由 Johannes Weiner 提交于 
      As fuse does not use the page cache library functions when userspace
writes to a file, it did not benefit from 'c8236db9 mm: mark page
accessed before we write_end()' that made sure pages are properly
marked accessed when written to.
Signed-off-by: NJohannes Weiner <jweiner@redhat.com>
Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz>
      478e0841
    • J
      fuse: delete dead .write_begin and .write_end aops · b40cdd56
      由 Johannes Weiner 提交于 
      Ever since 'ea9b9907 fuse: implement perform_write', the .write_begin
and .write_end aops have been dead code.

Their task - acquiring a page from the page cache, sending out a write
request and releasing the page again - is now done batch-wise to
maximize the number of pages send per userspace request.
Signed-off-by: NJohannes Weiner <jweiner@redhat.com>
Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz>
      b40cdd56
    • M
      fuse: fix flock · 37fb3a30
      由 Miklos Szeredi 提交于 
      Commit a9ff4f87 "fuse: support BSD locking semantics" overlooked a
number of issues with supporing flock locks over existing POSIX
locking infrastructure:

  - it's not backward compatible, passing flock(2) calls to userspace
    unconditionally (if userspace sets FUSE_POSIX_LOCKS)

  - it doesn't cater for the fact that flock locks are automatically
    unlocked on file release

  - it doesn't take into account the fact that flock exclusive locks
    (write locks) don't need an fd opened for write.

The last one invalidates the original premise of the patch that flock
locks can be emulated with POSIX locks.

This patch fixes the first two issues.  The last one needs to be fixed
in userspace if the filesystem assumed that a write lock will happen
only on a file operned for write (as in the case of the current fuse
library).
Reported-by: NSebastian Pipping <webmaster@hartwork.org>
Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz>
      37fb3a30
  25. 21 7月, 2011 3 次提交
  27. 31 3月, 2011 1 次提交
  29. 21 3月, 2011 1 次提交
  31. 25 2月, 2011 1 次提交
  33. 08 12月, 2010 2 次提交
  35. 30 11月, 2010 2 次提交
    • M
      fuse: verify ioctl retries · 7572777e
      由 Miklos Szeredi 提交于 
      Verify that the total length of the iovec returned in FUSE_IOCTL_RETRY
doesn't overflow iov_length().
Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz>
CC: Tejun Heo <tj@kernel.org>
CC: <stable@kernel.org>         [2.6.31+]
      7572777e
    • M
      fuse: fix ioctl when server is 32bit · d9d318d3
      由 Miklos Szeredi 提交于 
      If a 32bit CUSE server is run on 64bit this results in EIO being
returned to the caller.

The reason is that FUSE_IOCTL_RETRY reply was defined to use 'struct
iovec', which is different on 32bit and 64bit archs.

Work around this by looking at the size of the reply to determine
which struct was used.  This is only needed if CONFIG_COMPAT is
defined.

A more permanent fix for the interface will be to use the same struct
on both 32bit and 64bit.
Reported-by: N"ccmail111" <ccmail111@yahoo.com>
Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz>
CC: Tejun Heo <tj@kernel.org>
CC: <stable@kernel.org>         [2.6.31+]
      d9d318d3
  37. 25 11月, 2010 1 次提交
  39. 07 9月, 2010 1 次提交
  41. 12 7月, 2010 1 次提交
    • M
      fuse: add store request · a1d75f25
      由 Miklos Szeredi 提交于 
      Userspace filesystem can request data to be stored in the inode's
mapping.  This request is synchronous and has no reply.  If the write
to the fuse device returns an error then the store request was not
fully completed (but may have updated some pages).

If the stored data overflows the current file size, then the size is
extended, similarly to a write(2) on the filesystem.

Pages which have been completely stored are marked uptodate.
Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz>
      a1d75f25
  43. 28 5月, 2010 1 次提交
  45. 25 5月, 2010 4 次提交
    • M
      fuse: allow splice to move pages · ce534fb0
      由 Miklos Szeredi 提交于 
      When splicing buffers to the fuse device with SPLICE_F_MOVE, try to
move pages from the pipe buffer into the page cache.  This allows
populating the fuse filesystem's cache without ever touching the page
contents, i.e. zero copy read capability.

The following steps are performed when trying to move a page into the
page cache:

 - buf->ops->confirm() to make sure the new page is uptodate
 - buf->ops->steal() to try to remove the new page from it's previous place
 - remove_from_page_cache() on the old page
 - add_to_page_cache_locked() on the new page

If any of the above steps fail (non fatally) then the code falls back
to copying the page.  In particular ->steal() will fail if there are
external references (other than the page cache and the pipe buffer) to
the page.

Also since the remove_from_page_cache() + add_to_page_cache_locked()
are non-atomic it is possible that the page cache is repopulated in
between the two and add_to_page_cache_locked() will fail.  This could
be fixed by creating a new atomic replace_page_cache_page() function.

fuse_readpages_end() needed to be reworked so it works even if
page->mapping is NULL for some or all pages which can happen if the
add_to_page_cache_locked() failed.

A number of sanity checks were added to make sure the stolen pages
don't have weird flags set, etc...  These could be moved into generic
splice/steal code.
Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz>
      ce534fb0
    • M
      fuse: get page reference for readpages · b5dd3285
      由 Miklos Szeredi 提交于 
      Acquire a page ref on pages in ->readpages() and release them when the
read has finished.  Not acquiring a reference didn't seem to cause any
trouble since the page is locked and will not be kicked out of the
page cache during the read.

However the following patches will want to remove the page from the
cache so a separate ref is needed.  Making the reference in req->pages
explicit also makes the code easier to understand.
Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz>
      b5dd3285
    • M
      fuse: use get_user_pages_fast() · 1bf94ca7
      由 Miklos Szeredi 提交于 
      Replace uses of get_user_pages() with get_user_pages_fast().  It looks
nicer and should be faster in most cases.
Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz>
      1bf94ca7
    • D
      fuse: remove unneeded variable · 4aa0edd2
      由 Dan Carpenter 提交于 
      "map" isn't needed any more after: 0bd87182 "fuse: fix kunmap in
fuse_ioctl_copy_user" 
Signed-off-by: NDan Carpenter <error27@gmail.com>
Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz>
      4aa0edd2
  47. 03 2月, 2010 1 次提交
    • A
      mm: flush dcache before writing into page to avoid alias · 931e80e4
      由 anfei zhou 提交于 
      The cache alias problem will happen if the changes of user shared mapping
is not flushed before copying, then user and kernel mapping may be mapped
into two different cache line, it is impossible to guarantee the coherence
after iov_iter_copy_from_user_atomic.  So the right steps should be:

	flush_dcache_page(page);
	kmap_atomic(page);
	write to page;
	kunmap_atomic(page);
	flush_dcache_page(page);

More precisely, we might create two new APIs flush_dcache_user_page and
flush_dcache_kern_page to replace the two flush_dcache_page accordingly.

Here is a snippet tested on omap2430 with VIPT cache, and I think it is
not ARM-specific:

	int val = 0x11111111;
	fd = open("abc", O_RDWR);
	addr = mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
	*(addr+0) = 0x44444444;
	tmp = *(addr+0);
	*(addr+1) = 0x77777777;
	write(fd, &val, sizeof(int));
	close(fd);

The results are not always 0x11111111 0x77777777 at the beginning as expected.  Sometimes we see 0x44444444 0x77777777.
Signed-off-by: NAnfei <anfei.zhou@gmail.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: <linux-arch@vger.kernel.org>
Cc: <stable@kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      931e80e4
  49. 04 11月, 2009 2 次提交
  51. 28 9月, 2009 1 次提交