Skip to content

GitLab

Switch branch/tag
  1. 08 Sep, 2009 5 commits
  3. 07 Sep, 2009 1 commit
  5. 03 Sep, 2009 1 commit
  7. 28 Jun, 2009 1 commit
  9. 24 Jun, 2009 1 commit
  11. 12 Jun, 2009 7 commits
  13. 21 May, 2009 1 commit
  15. 09 May, 2009 1 commit
  17. 21 Apr, 2009 1 commit
    • David Woodhouse's avatar
      Fix i_mutex vs. readdir handling in nfsd · 2f9092e1
      David Woodhouse authored 
      Commit 14f7dd63 ("Copy XFS readdir hack into nfsd code") introduced a
bug to generic code which had been extant for a long time in the XFS
version -- it started to call through into lookup_one_len() and hence
into the file systems' ->lookup() methods without i_mutex held on the
directory.

This patch fixes it by locking the directory's i_mutex again before
calling the filldir functions. The original deadlocks which commit
14f7dd63 was designed to avoid are still avoided, because they were due
to fs-internal locking, not i_mutex.

While we're at it, fix the return type of nfsd_buffered_readdir() which
should be a __be32 not an int -- it's an NFS errno, not a Linux errno.
And return nfserrno(-ENOMEM) when allocation fails, not just -ENOMEM.
Sparse would have caught that, if it wasn't so busy bitching about
__cold__.

Commit 05f4f678

 ("nfsd4: don't do lookup within readdir in recovery
code") introduced a similar problem with calling lookup_one_len()
without i_mutex, which this patch also addresses. To fix that, it was
necessary to fix the called functions so that they expect i_mutex to be
held; that part was done by J. Bruce Fields.
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
Umm-I-can-live-with-that-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
Reported-by: default avatarJ. R. Okajima <hooanon05@yahoo.co.jp>
Tested-by: default avatarJ. Bruce Fields <bfields@citi.umich.edu>
LKML-Reference: <8036.1237474444@jrobl>
Cc: stable@kernel.org
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      2f9092e1
  19. 01 Apr, 2009 3 commits
  21. 27 Mar, 2009 1 commit
  23. 26 Mar, 2009 1 commit
  25. 05 Feb, 2009 1 commit
  27. 14 Jan, 2009 4 commits
  29. 05 Jan, 2009 1 commit
    • Al Viro's avatar
      inode->i_op is never NULL · acfa4380
      Al Viro authored 
      
We used to have rather schizophrenic set of checks for NULL ->i_op even
though it had been eliminated years ago.  You'd need to go out of your
way to set it to NULL explicitly _and_ a bunch of code would die on
such inodes anyway.  After killing two remaining places that still
did that bogosity, all that crap can go away.
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      acfa4380
  31. 04 Jan, 2009 1 commit
    • Nick Piggin's avatar
      fs: symlink write_begin allocation context fix · 54566b2c
      Nick Piggin authored 
      
With the write_begin/write_end aops, page_symlink was broken because it
could no longer pass a GFP_NOFS type mask into the point where the
allocations happened.  They are done in write_begin, which would always
assume that the filesystem can be entered from reclaim.  This bug could
cause filesystem deadlocks.

The funny thing with having a gfp_t mask there is that it doesn't really
allow the caller to arbitrarily tinker with the context in which it can be
called.  It couldn't ever be GFP_ATOMIC, for example, because it needs to
take the page lock.  The only thing any callers care about is __GFP_FS
anyway, so turn that into a single flag.

Add a new flag for write_begin, AOP_FLAG_NOFS.  Filesystems can now act on
this flag in their write_begin function.  Change __grab_cache_page to
accept a nofs argument as well, to honour that flag (while we're there,
change the name to grab_cache_page_write_begin which is more instructive
and does away with random leading underscores).

This is really a more flexible way to go in the end anyway -- if a
filesystem happens to want any extra allocations aside from the pagecache
ones in ints write_begin function, it may now use GFP_KERNEL (rather than
GFP_NOFS) for common case allocations (eg.  ocfs2_alloc_write_ctxt, for a
random example).

[kosaki.motohiro@jp.fujitsu.com: fix ubifs]
[kosaki.motohiro@jp.fujitsu.com: fix fuse]
Signed-off-by: default avatarNick Piggin <npiggin@suse.de>
Reviewed-by: default avatarKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: <stable@kernel.org>		[2.6.28.x]
Signed-off-by: default avatarKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
[ Cleaned up the calling convention: just pass in the AOP flags
  untouched to the grab_cache_page_write_begin() function.  That
  just simplifies everybody, and may even allow future expansion of the
  logic.   - Linus ]
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      54566b2c
  33. 31 Dec, 2008 8 commits
  35. 20 Nov, 2008 1 commit