1. 17 Oct, 2007 5 commits
  2. 20 Jul, 2007 1 commit
    • Paul Mundt's avatar
      mm: Remove slab destructors from kmem_cache_create(). · 20c2df83
      Paul Mundt authored
      Slab destructors were no longer supported after Christoph's
      c59def9f
      
       change. They've been
      BUGs for both slab and slub, and slob never supported them
      either.
      
      This rips out support for the dtor pointer from kmem_cache_create()
      completely and fixes up every single callsite in the kernel (there were
      about 224, not including the slab allocator definitions themselves,
      or the documentation references).
      Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
      20c2df83
  3. 16 Jun, 2007 1 commit
  4. 24 May, 2007 1 commit
  5. 21 May, 2007 1 commit
    • Alexey Dobriyan's avatar
      Detach sched.h from mm.h · e8edc6e0
      Alexey Dobriyan authored
      
      
      First thing mm.h does is including sched.h solely for can_do_mlock() inline
      function which has "current" dereference inside. By dealing with can_do_mlock()
      mm.h can be detached from sched.h which is good. See below, why.
      
      This patch
      a) removes unconditional inclusion of sched.h from mm.h
      b) makes can_do_mlock() normal function in mm/mlock.c
      c) exports can_do_mlock() to not break compilation
      d) adds sched.h inclusions back to files that were getting it indirectly.
      e) adds less bloated headers to some files (asm/signal.h, jiffies.h) that were
         getting them indirectly
      
      Net result is:
      a) mm.h users would get less code to open, read, preprocess, parse, ... if
         they don't need sched.h
      b) sched.h stops being dependency for significant number of files:
         on x86_64 allmodconfig touching sched.h results in recompile of 4083 files,
         after patch it's only 3744 (-8.3%).
      
      Cross-compile tested on
      
      	all arm defconfigs, all mips defconfigs, all powerpc defconfigs,
      	alpha alpha-up
      	arm
      	i386 i386-up i386-defconfig i386-allnoconfig
      	ia64 ia64-up
      	m68k
      	mips
      	parisc parisc-up
      	powerpc powerpc-up
      	s390 s390-up
      	sparc sparc-up
      	sparc64 sparc64-up
      	um-x86_64
      	x86_64 x86_64-up x86_64-defconfig x86_64-allnoconfig
      
      as well as my two usual configs.
      Signed-off-by: default avatarAlexey Dobriyan <adobriyan@gmail.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e8edc6e0
  6. 17 May, 2007 1 commit
    • Christoph Lameter's avatar
      Remove SLAB_CTOR_CONSTRUCTOR · a35afb83
      Christoph Lameter authored
      
      
      SLAB_CTOR_CONSTRUCTOR is always specified. No point in checking it.
      Signed-off-by: default avatarChristoph Lameter <clameter@sgi.com>
      Cc: David Howells <dhowells@redhat.com>
      Cc: Jens Axboe <jens.axboe@oracle.com>
      Cc: Steven French <sfrench@us.ibm.com>
      Cc: Michael Halcrow <mhalcrow@us.ibm.com>
      Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
      Cc: Miklos Szeredi <miklos@szeredi.hu>
      Cc: Steven Whitehouse <swhiteho@redhat.com>
      Cc: Roman Zippel <zippel@linux-m68k.org>
      Cc: David Woodhouse <dwmw2@infradead.org>
      Cc: Dave Kleikamp <shaggy@austin.ibm.com>
      Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
      Cc: "J. Bruce Fields" <bfields@fieldses.org>
      Cc: Anton Altaparmakov <aia21@cantab.net>
      Cc: Mark Fasheh <mark.fasheh@oracle.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Christoph Hellwig <hch@lst.de>
      Cc: Jan Kara <jack@ucw.cz>
      Cc: David Chinner <dgc@sgi.com>
      Cc: "David S. Miller" <davem@davemloft.net>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      a35afb83
  7. 08 May, 2007 1 commit
    • Miklos Szeredi's avatar
      add filesystem subtype support · 79c0b2df
      Miklos Szeredi authored
      
      
      There's a slight problem with filesystem type representation in fuse
      based filesystems.
      
      From the kernel's view, there are just two filesystem types: fuse and
      fuseblk.  From the user's view there are lots of different filesystem
      types.  The user is not even much concerned if the filesystem is fuse based
      or not.  So there's a conflict of interest in how this should be
      represented in fstab, mtab and /proc/mounts.
      
      The current scheme is to encode the real filesystem type in the mount
      source.  So an sshfs mount looks like this:
      
        sshfs#user@server:/   /mnt/server    fuse   rw,nosuid,nodev,...
      
      This url-ish syntax works OK for sshfs and similar filesystems.  However
      for block device based filesystems (ntfs-3g, zfs) it doesn't work, since
      the kernel expects the mount source to be a real device name.
      
      A possibly better scheme would be to encode the real type in the type
      field as "type.subtype".  So fuse mounts would look like this:
      
        /dev/hda1       /mnt/windows   fuseblk.ntfs-3g   rw,...
        user@server:/   /mnt/server    fuse.sshfs        rw,nosuid,nodev,...
      
      This patch adds the necessary code to the kernel so that this can be
      correctly displayed in /proc/mounts.
      Signed-off-by: default avatarMiklos Szeredi <mszeredi@suse.cz>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      79c0b2df
  8. 07 May, 2007 1 commit
    • Christoph Lameter's avatar
      slab allocators: Remove SLAB_DEBUG_INITIAL flag · 50953fe9
      Christoph Lameter authored
      
      
      I have never seen a use of SLAB_DEBUG_INITIAL.  It is only supported by
      SLAB.
      
      I think its purpose was to have a callback after an object has been freed
      to verify that the state is the constructor state again?  The callback is
      performed before each freeing of an object.
      
      I would think that it is much easier to check the object state manually
      before the free.  That also places the check near the code object
      manipulation of the object.
      
      Also the SLAB_DEBUG_INITIAL callback is only performed if the kernel was
      compiled with SLAB debugging on.  If there would be code in a constructor
      handling SLAB_DEBUG_INITIAL then it would have to be conditional on
      SLAB_DEBUG otherwise it would just be dead code.  But there is no such code
      in the kernel.  I think SLUB_DEBUG_INITIAL is too problematic to make real
      use of, difficult to understand and there are easier ways to accomplish the
      same effect (i.e.  add debug code before kfree).
      
      There is a related flag SLAB_CTOR_VERIFY that is frequently checked to be
      clear in fs inode caches.  Remove the pointless checks (they would even be
      pointless without removeal of SLAB_DEBUG_INITIAL) from the fs constructors.
      
      This is the last slab flag that SLUB did not support.  Remove the check for
      unimplemented flags from SLUB.
      Signed-off-by: default avatarChristoph Lameter <clameter@sgi.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      50953fe9
  9. 03 May, 2007 1 commit
  10. 09 Apr, 2007 1 commit
  11. 12 Feb, 2007 1 commit
  12. 11 Feb, 2007 1 commit
  13. 07 Dec, 2006 6 commits
  14. 17 Oct, 2006 4 commits
    • Miklos Szeredi's avatar
      [PATCH] fuse: fix handling of moved directory · d2a85164
      Miklos Szeredi authored
      
      
      Fuse considered it an error (EIO) if lookup returned a directory inode, to
      which a dentry already refered.  This is because directory aliases are not
      allowed.
      
      But in a network filesystem this could happen legitimately, if a directory is
      moved on a remote client.  This patch attempts to relax the restriction by
      trying to first evict the offending alias from the cache.  If this fails, it
      still returns an error (EBUSY).
      
      A rarer situation is if an mkdir races with an indenpendent lookup, which
      finds the newly created directory already moved.  In this situation the mkdir
      should return success, but that would be incorrect, since the dentry cannot be
      instantiated, so return EBUSY.
      
      Previously checking for a directory alias and instantiation of the dentry
      weren't done atomically in lookup/mkdir, hence two such calls racing with each
      other could create aliased directories.  To prevent this introduce a new
      per-connection mutex: fuse_conn->inst_mutex, which is taken for instantiations
      with a directory inode.
      Signed-off-by: default avatarMiklos Szeredi <miklos@szeredi.hu>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      d2a85164
    • Miklos Szeredi's avatar
      [PATCH] fuse: fix spurious BUG · 265126ba
      Miklos Szeredi authored
      
      
      Fix a spurious BUG in an unlikely race, where at least three parallel lookups
      return the same inode, but with different file type.  This has not yet been
      observed in real life.
      
      Allowing unlimited retries could delay fuse_iget() indefinitely, but this is
      really for the broken userspace filesystem to worry about.
      Signed-off-by: default avatarMiklos Szeredi <miklos@szeredi.hu>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      265126ba
    • Miklos Szeredi's avatar
      [PATCH] fuse: locking fix for nlookup · 8da5ff23
      Miklos Szeredi authored
      
      
      An inode could be returned by independent parallel lookups, in this case an
      update of the lookup counter could be lost resulting in a memory leak in
      userspace.
      Signed-off-by: default avatarMiklos Szeredi <miklos@szeredi.hu>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      8da5ff23
    • Miklos Szeredi's avatar
      [PATCH] fuse: fix hang on SMP · 9ffbb916
      Miklos Szeredi authored
      
      
      Fuse didn't always call i_size_write() with i_mutex held which caused rare
      hangs on SMP/32bit.  This bug has been present since fuse-2.2, well before
      being merged into mainline.
      
      The simplest solution is to protect i_size_write() with the per-connection
      spinlock.  Using i_mutex for this purpose would require some restructuring of
      the code and I'm not even sure it's always safe to acquire i_mutex in all
      places i_size needs to be set.
      
      Since most of vmtruncate is already duplicated for other reasons, duplicate
      the remaining part as well, making all i_size_write() calls internal to fuse.
      
      Using i_size_write() was unnecessary in fuse_init_inode(), since this function
      is only called on a newly created locked inode.
      
      Reported by a few people over the years, but special thanks to Dana Henriksen
      who was persistent enough in helping me debug it.
      Signed-off-by: default avatarMiklos Szeredi <miklos@szeredi.hu>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      9ffbb916
  15. 29 Sep, 2006 1 commit
  16. 27 Sep, 2006 1 commit
  17. 31 Jul, 2006 1 commit
    • Miklos Szeredi's avatar
      [PATCH] fuse: use jiffies_64 · 0a0898cf
      Miklos Szeredi authored
      
      
      It is entirely possible (though rare) that jiffies half-wraps around, while a
      dentry/inode remains in the cache.  This could mean that the dentry/inode is
      not invalidated for another half wraparound-time.
      
      To get around this problem, use 64-bit jiffies.  The only problem with this is
      that dentry->d_time is 32 bits on 32-bit archs.  So use d_fsdata as the high
      32 bits.  This is an ugly hack, but far simpler, than having to allocate
      private data just for this purpose.
      
      Since 64-bit jiffies can be assumed never to wrap around, simple comparison
      can be used, and a zero time value can represent "invalid".
      Signed-off-by: default avatarMiklos Szeredi <miklos@szeredi.hu>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      0a0898cf
  18. 25 Jun, 2006 5 commits
  19. 23 Jun, 2006 2 commits
    • David Howells's avatar
      [PATCH] VFS: Permit filesystem to perform statfs with a known root dentry · 726c3342
      David Howells authored
      
      
      Give the statfs superblock operation a dentry pointer rather than a superblock
      pointer.
      
      This complements the get_sb() patch.  That reduced the significance of
      sb->s_root, allowing NFS to place a fake root there.  However, NFS does
      require a dentry to use as a target for the statfs operation.  This permits
      the root in the vfsmount to be used instead.
      
      linux/mount.h has been added where necessary to make allyesconfig build
      successfully.
      
      Interest has also been expressed for use with the FUSE and XFS filesystems.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Acked-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      Cc: Nathan Scott <nathans@sgi.com>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      726c3342
    • David Howells's avatar
      [PATCH] VFS: Permit filesystem to override root dentry on mount · 454e2398
      David Howells authored
      
      
      Extend the get_sb() filesystem operation to take an extra argument that
      permits the VFS to pass in the target vfsmount that defines the mountpoint.
      
      The filesystem is then required to manually set the superblock and root dentry
      pointers.  For most filesystems, this should be done with simple_set_mnt()
      which will set the superblock pointer and then set the root dentry to the
      superblock's s_root (as per the old default behaviour).
      
      The get_sb() op now returns an integer as there's now no need to return the
      superblock pointer.
      
      This patch permits a superblock to be implicitly shared amongst several mount
      points, such as can be done with NFS to avoid potential inode aliasing.  In
      such a case, simple_set_mnt() would not be called, and instead the mnt_root
      and mnt_sb would be set directly.
      
      The patch also makes the following changes:
      
       (*) the get_sb_*() convenience functions in the core kernel now take a vfsmount
           pointer argument and return an integer, so most filesystems have to change
           very little.
      
       (*) If one of the convenience function is not used, then get_sb() should
           normally call simple_set_mnt() to instantiate the vfsmount. This will
           always return 0, and so can be tail-called from get_sb().
      
       (*) generic_shutdown_super() now calls shrink_dcache_sb() to clean up the
           dcache upon superblock destruction rather than shrink_dcache_anon().
      
           This is required because the superblock may now have multiple trees that
           aren't actually bound to s_root, but that still need to be cleaned up. The
           currently called functions assume that the whole tree is rooted at s_root,
           and that anonymous dentries are not the roots of trees which results in
           dentries being left unculled.
      
           However, with the way NFS superblock sharing are currently set to be
           implemented, these assumptions are violated: the root of the filesystem is
           simply a dummy dentry and inode (the real inode for '/' may well be
           inaccessible), and all the vfsmounts are rooted on anonymous[*] dentries
           with child trees.
      
           [*] Anonymous until discovered from another tree.
      
       (*) The documentation has been adjusted, including the additional bit of
           changing ext2_* into foo_* in the documentation.
      
      [akpm@osdl.org: convert ipath_fs, do other stuff]
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Acked-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      Cc: Nathan Scott <nathans@sgi.com>
      Cc: Roland Dreier <rolandd@cisco.com>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      454e2398
  20. 09 Jun, 2006 1 commit
  21. 26 Apr, 2006 2 commits
  22. 11 Apr, 2006 1 commit
    • Miklos Szeredi's avatar
      [fuse] fix deadlock between fuse_put_super() and request_end() · 73ce8355
      Miklos Szeredi authored
      
      
      A deadlock was possible, when the last reference to the superblock was
      held due to a background request containing a file reference.
      
      Releasing the file would release the vfsmount which in turn would
      release the superblock.  Since sbput_sem is held during the fput() and
      fuse_put_super() tries to acquire this same semaphore, a deadlock
      results.
      
      The chosen soltuion is to get rid of sbput_sem, and instead use the
      spinlock to ensure the referenced inodes/file are released only once.
      Since the actual release may sleep, defer these outside the locked
      region, but using local variables instead of the structure members.
      
      This is a much more rubust solution.
      Signed-off-by: default avatarMiklos Szeredi <miklos@szeredi.hu>
      73ce8355