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  1. 09 11月, 2013 8 次提交
    • A
      restore 32bit aout coredump · 7d2f551f
      由 Al Viro 提交于 
      just getting rid of bitrot
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      7d2f551f
    • A
      no need to keep brlock macros anymore... · 0f6ed63b
      由 Al Viro 提交于 
      Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      0f6ed63b
    • A
      coda_revalidate_inode(): switch to passing inode... · 11d100d9
      由 Al Viro 提交于 
      Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      11d100d9
    • A
      fold __d_shrink() into its only remaining caller · b61625d2
      由 Al Viro 提交于 
      Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      b61625d2
    • A
      get rid of s_files and files_lock · eee5cc27
      由 Al Viro 提交于 
      The only thing we need it for is alt-sysrq-r (emergency remount r/o)
and these days we can do just as well without going through the
list of files.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      eee5cc27
    • A
      get rid of {lock,unlock}_rcu_walk() · 8b61e74f
      由 Al Viro 提交于 
      those have become aliases for rcu_read_{lock,unlock}()
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      8b61e74f
    • A
      RCU'd vfsmounts · 48a066e7
      由 Al Viro 提交于 
      * RCU-delayed freeing of vfsmounts
* vfsmount_lock replaced with a seqlock (mount_lock)
* sequence number from mount_lock is stored in nameidata->m_seq and
used when we exit RCU mode
* new vfsmount flag - MNT_SYNC_UMOUNT.  Set by umount_tree() when its
caller knows that vfsmount will have no surviving references.
* synchronize_rcu() done between unlocking namespace_sem in namespace_unlock()
and doing pending mntput().
* new helper: legitimize_mnt(mnt, seq).  Checks the mount_lock sequence
number against seq, then grabs reference to mnt.  Then it rechecks mount_lock
again to close the race and either returns success or drops the reference it
has acquired.  The subtle point is that in case of MNT_SYNC_UMOUNT we can
simply decrement the refcount and sod off - aforementioned synchronize_rcu()
makes sure that final mntput() won't come until we leave RCU mode.  We need
that, since we don't want to end up with some lazy pathwalk racing with
umount() and stealing the final mntput() from it - caller of umount() may
expect it to return only once the fs is shut down and we don't want to break
that.  In other cases (i.e. with MNT_SYNC_UMOUNT absent) we have to do
full-blown mntput() in case of mount_lock sequence number mismatch happening
just as we'd grabbed the reference, but in those cases we won't be stealing
the final mntput() from anything that would care.
* mntput_no_expire() doesn't lock anything on the fast path now.  Incidentally,
SMP and UP cases are handled the same way - no ifdefs there.
* normal pathname resolution does *not* do any writes to mount_lock.  It does,
of course, bump the refcounts of vfsmount and dentry in the very end, but that's
it.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      48a066e7
    • A
      switch shrink_dcache_for_umount() to use of d_walk() · 42c32608
      由 Al Viro 提交于 
      we have too many iterators in fs/dcache.c...
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      42c32608
  3. 25 10月, 2013 32 次提交