1. 12 Mar, 2015 2 commits
    • Paul E. McKenney's avatar
      rcu: Move rcu_report_unblock_qs_rnp() to common code · cc99a310
      Paul E. McKenney authored
      The rcu_report_unblock_qs_rnp() function is invoked when the
      last task blocking the current grace period exits its outermost
      RCU read-side critical section.  Previously, this was called only
      from rcu_read_unlock_special(), and was therefore defined only when
      CONFIG_RCU_PREEMPT=y.  However, this function will be invoked even when
      CONFIG_RCU_PREEMPT=n once CPU-hotplug operations are processed only at
      the beginnings of RCU grace periods.  The reason for this change is that
      the last task on a given leaf rcu_node structure's ->blkd_tasks list
      might well exit its RCU read-side critical section between the time that
      recent CPU-hotplug operations were applied and when the new grace period
      was initialized.  This situation could result in RCU waiting forever on
      that leaf rcu_node structure, because if all that structure's CPUs were
      already offline, there would be no quiescent-state events to drive that
      structure's part of the grace period.
      
      This commit therefore moves rcu_report_unblock_qs_rnp() to common code
      that is built unconditionally so that the quiescent-state-forcing code
      can clean up after this situation, avoiding the grace-period stall.
      Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      cc99a310
    • Paul E. McKenney's avatar
      rcu: Rework preemptible expedited bitmask handling · 8eb74b2b
      Paul E. McKenney authored
      Currently, the rcu_node tree ->expmask bitmasks are initially set to
      reflect the online CPUs.  This is pointless, because only the CPUs
      preempted within RCU read-side critical sections by the preceding
      synchronize_sched_expedited() need to be tracked.  This commit therefore
      instead sets up these bitmasks based on the state of the ->blkd_tasks
      lists.
      Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      8eb74b2b
  2. 11 Mar, 2015 12 commits
    • Paul E. McKenney's avatar
      rcu: Remove event tracing from rcu_cpu_notify(), used by offline CPUs · 999c2863
      Paul E. McKenney authored
      Offline CPUs cannot safely invoke trace events, but such CPUs do execute
      within rcu_cpu_notify().  Therefore, this commit removes the trace events
      from rcu_cpu_notify().  These trace events are for utilization, against
      which rcu_cpu_notify() execution time should be negligible.
      Reported-by: default avatarFengguang Wu <fengguang.wu@intel.com>
      Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      999c2863
    • Paul E. McKenney's avatar
      rcutorture: Enable slow grace-period initializations · b6505dea
      Paul E. McKenney authored
      This commit sets CONFIG_RCU_TORTURE_TEST_SLOW_INIT=y, but leaves the
      default time zero.  This can be overridden by passing the
      "--bootargs rcutree.gp_init_delay=1" argument to kvm.sh.
      Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      b6505dea
    • Paul E. McKenney's avatar
      rcu: Provide diagnostic option to slow down grace-period initialization · 37745d28
      Paul E. McKenney authored
      Grace-period initialization normally proceeds quite quickly, so
      that it is very difficult to reproduce races against grace-period
      initialization.  This commit therefore allows grace-period
      initialization to be artificially slowed down, increasing
      race-reproduction probability.  A pair of new Kconfig parameters are
      provided, CONFIG_RCU_TORTURE_TEST_SLOW_INIT to enable the slowdowns, and
      CONFIG_RCU_TORTURE_TEST_SLOW_INIT_DELAY to specify the number of jiffies
      of slowdown to apply.  A boot-time parameter named rcutree.gp_init_delay
      allows boot-time delay to be specified.  By default, no delay will be
      applied even if CONFIG_RCU_TORTURE_TEST_SLOW_INIT is set.
      Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      37745d28
    • Paul E. McKenney's avatar
      rcu: Detect stalls caused by failure to propagate up rcu_node tree · 237a0f21
      Paul E. McKenney authored
      If all CPUs have passed through quiescent states, then stalls might be
      due to starvation of the grace-period kthread or to failure to propagate
      the quiescent states up the rcu_node combining tree.  The current stall
      warning messages do not differentiate, so this commit adds a printout
      of the root rcu_node structure's ->qsmask field.
      Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      237a0f21
    • Paul E. McKenney's avatar
      18c629ea
    • Paul E. McKenney's avatar
      rcu: Simplify sync_rcu_preempt_exp_init() · c8aead6a
      Paul E. McKenney authored
      This commit eliminates a boolean and associated "if" statement by
      rearranging the code.
      Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      c8aead6a
    • Paul E. McKenney's avatar
    • Paul E. McKenney's avatar
      rcu: Consolidate offline-CPU callback initialization · b33078b6
      Paul E. McKenney authored
      Currently, both rcu_cleanup_dead_cpu() and rcu_send_cbs_to_orphanage()
      initialize the outgoing CPU's callback list.  However, only
      rcu_cleanup_dead_cpu() invokes rcu_send_cbs_to_orphanage(), and
      it does so unconditionally, which means that only one of these
      initializations is required.  This commit therefore consolidates the
      callback-list initialization with the rest of the callback handling in
      rcu_send_cbs_to_orphanage().
      Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      b33078b6
    • Paul E. McKenney's avatar
      metag: Use common outgoing-CPU-notification code · 490ab882
      Paul E. McKenney authored
      This commit removes the open-coded CPU-offline notification with new
      common code.  This change avoids calling scheduler code using RCU from
      an offline CPU that RCU is ignoring.  This commit is compatible with
      the existing code in not checking for timeout during a prior offline
      for a given CPU.
      Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      Cc: James Hogan <james.hogan@imgtec.com>
      Cc: <linux-metag@vger.kernel.org>
      490ab882
    • Paul E. McKenney's avatar
      blackfin: Use common outgoing-CPU-notification code · a17b4b74
      Paul E. McKenney authored
      This commit removes the open-coded CPU-offline notification with new
      common code.  This change avoids calling scheduler code using RCU from
      an offline CPU that RCU is ignoring.  This commit is compatible with
      the existing code in not checking for timeout during a prior offline
      for a given CPU.
      Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      Cc: Steven Miao <realmz6@gmail.com>
      Cc: <adi-buildroot-devel@lists.sourceforge.net>
      a17b4b74
    • Paul E. McKenney's avatar
      x86: Use common outgoing-CPU-notification code · 2a442c9c
      Paul E. McKenney authored
      This commit removes the open-coded CPU-offline notification with new
      common code.  Among other things, this change avoids calling scheduler
      code using RCU from an offline CPU that RCU is ignoring.  It also allows
      Xen to notice at online time that the CPU did not go offline correctly.
      Note that Xen has the surviving CPU carry out some cleanup operations,
      so if the surviving CPU times out, these cleanup operations might have
      been carried out while the outgoing CPU was still running.  It might
      therefore be unwise to bring this CPU back online, and this commit
      avoids doing so.
      Signed-off-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
      Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      Cc: <x86@kernel.org>
      Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      Cc: David Vrabel <david.vrabel@citrix.com>
      Cc: <xen-devel@lists.xenproject.org>
      2a442c9c
    • Paul E. McKenney's avatar
      smpboot: Add common code for notification from dying CPU · 8038dad7
      Paul E. McKenney authored
      RCU ignores offlined CPUs, so they cannot safely run RCU read-side code.
      (They -can- use SRCU, but not RCU.)  This means that any use of RCU
      during or after the call to arch_cpu_idle_dead().  Unfortunately,
      commit 2ed53c0d added a complete() call, which will contain RCU
      read-side critical sections if there is a task waiting to be awakened.
      
      Which, as it turns out, there almost never is.  In my qemu/KVM testing,
      the to-be-awakened task is not yet asleep more than 99.5% of the time.
      In current mainline, failure is even harder to reproduce, requiring a
      virtualized environment that delays the outgoing CPU by at least three
      jiffies between the time it exits its stop_machine() task at CPU_DYING
      time and the time it calls arch_cpu_idle_dead() from the idle loop.
      However, this problem really can occur, especially in virtualized
      environments, and therefore really does need to be fixed
      
      This suggests moving back to the polling loop, but using a much shorter
      wait, with gentle exponential backoff instead of the old 100-millisecond
      wait.  Most of the time, the loop will exit without waiting at all,
      and almost all of the remaining uses will wait only five microseconds.
      If the outgoing CPU is preempted, a loop will wait one jiffy, then
      increase the wait by a factor of 11/10ths, rounding up.  As before, there
      is a five-second timeout.
      
      This commit therefore provides common-code infrastructure to do the
      dying-to-surviving CPU handoff in a safe manner.  This code also
      provides an indication at CPU-online of whether the CPU to be onlined
      previously timed out on offline.  The new cpu_check_up_prepare() function
      returns -EBUSY if this CPU previously took more than five seconds to
      go offline, or -EAGAIN if it has not yet managed to go offline.  The
      rationale for -EAGAIN is that it might still be preempted, so an additional
      wait might well find it correctly offlined.  Architecture-specific code
      can decide how to handle these conditions.  Systems in which CPUs take
      themselves completely offline might respond to an -EBUSY return as if
      it was a zero (success) return.  Systems in which the surviving CPU must
      take some action might take it at this time, or might simply mark the
      other CPU as unusable.
      
      Note that architectures that take the easy way out and simply pass the
      -EBUSY and -EAGAIN upwards will change the sysfs API.
      Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      Cc: <linux-api@vger.kernel.org>
      Cc: <linux-arch@vger.kernel.org>
      [ paulmck: Fixed state machine for architectures that don't check earlier
        CPU-hotplug results as suggested by James Hogan. ]
      8038dad7
  3. 23 Feb, 2015 3 commits
    • Linus Torvalds's avatar
      Linux 4.0-rc1 · c517d838
      Linus Torvalds authored
      .. after extensive statistical analysis of my G+ polling, I've come to
      the inescapable conclusion that internet polls are bad.
      
      Big surprise.
      
      But "Hurr durr I'ma sheep" trounced "I like online polls" by a 62-to-38%
      margin, in a poll that people weren't even supposed to participate in.
      Who can argue with solid numbers like that? 5,796 votes from people who
      can't even follow the most basic directions?
      
      In contrast, "v4.0" beat out "v3.20" by a slimmer margin of 56-to-44%,
      but with a total of 29,110 votes right now.
      
      Now, arguably, that vote spread is only about 3,200 votes, which is less
      than the almost six thousand votes that the "please ignore" poll got, so
      it could be considered noise.
      
      But hey, I asked, so I'll honor the votes.
      c517d838
    • Linus Torvalds's avatar
      Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 · feaf2229
      Linus Torvalds authored
      Pull ext4 fixes from Ted Ts'o:
       "Ext4 bug fixes.
      
        We also reserved code points for encryption and read-only images (for
        which the implementation is mostly just the reserved code point for a
        read-only feature :-)"
      
      * tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
        ext4: fix indirect punch hole corruption
        ext4: ignore journal checksum on remount; don't fail
        ext4: remove duplicate remount check for JOURNAL_CHECKSUM change
        ext4: fix mmap data corruption in nodelalloc mode when blocksize < pagesize
        ext4: support read-only images
        ext4: change to use setup_timer() instead of init_timer()
        ext4: reserve codepoints used by the ext4 encryption feature
        jbd2: complain about descriptor block checksum errors
      feaf2229
    • Linus Torvalds's avatar
      Merge branch 'for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs · be5e6616
      Linus Torvalds authored
      Pull more vfs updates from Al Viro:
       "Assorted stuff from this cycle.  The big ones here are multilayer
        overlayfs from Miklos and beginning of sorting ->d_inode accesses out
        from David"
      
      * 'for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (51 commits)
        autofs4 copy_dev_ioctl(): keep the value of ->size we'd used for allocation
        procfs: fix race between symlink removals and traversals
        debugfs: leave freeing a symlink body until inode eviction
        Documentation/filesystems/Locking: ->get_sb() is long gone
        trylock_super(): replacement for grab_super_passive()
        fanotify: Fix up scripted S_ISDIR/S_ISREG/S_ISLNK conversions
        Cachefiles: Fix up scripted S_ISDIR/S_ISREG/S_ISLNK conversions
        VFS: (Scripted) Convert S_ISLNK/DIR/REG(dentry->d_inode) to d_is_*(dentry)
        SELinux: Use d_is_positive() rather than testing dentry->d_inode
        Smack: Use d_is_positive() rather than testing dentry->d_inode
        TOMOYO: Use d_is_dir() rather than d_inode and S_ISDIR()
        Apparmor: Use d_is_positive/negative() rather than testing dentry->d_inode
        Apparmor: mediated_filesystem() should use dentry->d_sb not inode->i_sb
        VFS: Split DCACHE_FILE_TYPE into regular and special types
        VFS: Add a fallthrough flag for marking virtual dentries
        VFS: Add a whiteout dentry type
        VFS: Introduce inode-getting helpers for layered/unioned fs environments
        Infiniband: Fix potential NULL d_inode dereference
        posix_acl: fix reference leaks in posix_acl_create
        autofs4: Wrong format for printing dentry
        ...
      be5e6616
  4. 22 Feb, 2015 21 commits
    • Linus Torvalds's avatar
      Merge branch 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm · 90c453ca
      Linus Torvalds authored
      Pull ARM fix from Russell King:
       "Just one fix this time around.  __iommu_alloc_buffer() can cause a
        BUG() if dma_alloc_coherent() is called with either __GFP_DMA32 or
        __GFP_HIGHMEM set.  The patch from Alexandre addresses this"
      
      * 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm:
        ARM: 8305/1: DMA: Fix kzalloc flags in __iommu_alloc_buffer()
      90c453ca
    • Al Viro's avatar
      autofs4 copy_dev_ioctl(): keep the value of ->size we'd used for allocation · 0a280962
      Al Viro authored
      X-Coverup: just ask spender
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      0a280962
    • Al Viro's avatar
      procfs: fix race between symlink removals and traversals · 7e0e953b
      Al Viro authored
      use_pde()/unuse_pde() in ->follow_link()/->put_link() resp.
      
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      7e0e953b
    • Al Viro's avatar
      debugfs: leave freeing a symlink body until inode eviction · 0db59e59
      Al Viro authored
      As it is, we have debugfs_remove() racing with symlink traversals.
      Supply ->evict_inode() and do freeing there - inode will remain
      pinned until we are done with the symlink body.
      
      And rip the idiocy with checking if dentry is positive right after
      we'd verified debugfs_positive(), which is a stronger check...
      
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      0db59e59
    • Al Viro's avatar
      dca11178
    • Konstantin Khlebnikov's avatar
      trylock_super(): replacement for grab_super_passive() · eb6ef3df
      Konstantin Khlebnikov authored
      I've noticed significant locking contention in memory reclaimer around
      sb_lock inside grab_super_passive(). Grab_super_passive() is called from
      two places: in icache/dcache shrinkers (function super_cache_scan) and
      from writeback (function __writeback_inodes_wb). Both are required for
      progress in memory allocator.
      
      Grab_super_passive() acquires sb_lock to increment sb->s_count and check
      sb->s_instances. It seems sb->s_umount locked for read is enough here:
      super-block deactivation always runs under sb->s_umount locked for write.
      Protecting super-block itself isn't a problem: in super_cache_scan() sb
      is protected by shrinker_rwsem: it cannot be freed if its slab shrinkers
      are still active. Inside writeback super-block comes from inode from bdi
      writeback list under wb->list_lock.
      
      This patch removes locking sb_lock and checks s_instances under s_umount:
      generic_shutdown_super() unlinks it under sb->s_umount locked for write.
      New variant is called trylock_super() and since it only locks semaphore,
      callers must call up_read(&sb->s_umount) instead of drop_super(sb) when
      they're done.
      Signed-off-by: default avatarKonstantin Khlebnikov <khlebnikov@yandex-team.ru>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      eb6ef3df
    • David Howells's avatar
      fanotify: Fix up scripted S_ISDIR/S_ISREG/S_ISLNK conversions · 54f2a2f4
      David Howells authored
      Fanotify probably doesn't want to watch autodirs so make it use d_can_lookup()
      rather than d_is_dir() when checking a dir watch and give an error on fake
      directories.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      54f2a2f4
    • David Howells's avatar
      Cachefiles: Fix up scripted S_ISDIR/S_ISREG/S_ISLNK conversions · ce40fa78
      David Howells authored
      Fix up the following scripted S_ISDIR/S_ISREG/S_ISLNK conversions (or lack
      thereof) in cachefiles:
      
       (1) Cachefiles mostly wants to use d_can_lookup() rather than d_is_dir() as
           it doesn't want to deal with automounts in its cache.
      
       (2) Coccinelle didn't find S_IS* expressions in ASSERT() statements in
           cachefiles.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      ce40fa78
    • David Howells's avatar
      VFS: (Scripted) Convert S_ISLNK/DIR/REG(dentry->d_inode) to d_is_*(dentry) · e36cb0b8
      David Howells authored
      Convert the following where appropriate:
      
       (1) S_ISLNK(dentry->d_inode) to d_is_symlink(dentry).
      
       (2) S_ISREG(dentry->d_inode) to d_is_reg(dentry).
      
       (3) S_ISDIR(dentry->d_inode) to d_is_dir(dentry).  This is actually more
           complicated than it appears as some calls should be converted to
           d_can_lookup() instead.  The difference is whether the directory in
           question is a real dir with a ->lookup op or whether it's a fake dir with
           a ->d_automount op.
      
      In some circumstances, we can subsume checks for dentry->d_inode not being
      NULL into this, provided we the code isn't in a filesystem that expects
      d_inode to be NULL if the dirent really *is* negative (ie. if we're going to
      use d_inode() rather than d_backing_inode() to get the inode pointer).
      
      Note that the dentry type field may be set to something other than
      DCACHE_MISS_TYPE when d_inode is NULL in the case of unionmount, where the VFS
      manages the fall-through from a negative dentry to a lower layer.  In such a
      case, the dentry type of the negative union dentry is set to the same as the
      type of the lower dentry.
      
      However, if you know d_inode is not NULL at the call site, then you can use
      the d_is_xxx() functions even in a filesystem.
      
      There is one further complication: a 0,0 chardev dentry may be labelled
      DCACHE_WHITEOUT_TYPE rather than DCACHE_SPECIAL_TYPE.  Strictly, this was
      intended for special directory entry types that don't have attached inodes.
      
      The following perl+coccinelle script was used:
      
      use strict;
      
      my @callers;
      open($fd, 'git grep -l \'S_IS[A-Z].*->d_inode\' |') ||
          die "Can't grep for S_ISDIR and co. callers";
      @callers = <$fd>;
      close($fd);
      unless (@callers) {
          print "No matches\n";
          exit(0);
      }
      
      my @cocci = (
          '@@',
          'expression E;',
          '@@',
          '',
          '- S_ISLNK(E->d_inode->i_mode)',
          '+ d_is_symlink(E)',
          '',
          '@@',
          'expression E;',
          '@@',
          '',
          '- S_ISDIR(E->d_inode->i_mode)',
          '+ d_is_dir(E)',
          '',
          '@@',
          'expression E;',
          '@@',
          '',
          '- S_ISREG(E->d_inode->i_mode)',
          '+ d_is_reg(E)' );
      
      my $coccifile = "tmp.sp.cocci";
      open($fd, ">$coccifile") || die $coccifile;
      print($fd "$_\n") || die $coccifile foreach (@cocci);
      close($fd);
      
      foreach my $file (@callers) {
          chomp $file;
          print "Processing ", $file, "\n";
          system("spatch", "--sp-file", $coccifile, $file, "--in-place", "--no-show-diff") == 0 ||
      	die "spatch failed";
      }
      
      [AV: overlayfs parts skipped]
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      e36cb0b8
    • David Howells's avatar
      SELinux: Use d_is_positive() rather than testing dentry->d_inode · 2c616d4d
      David Howells authored
      Use d_is_positive() rather than testing dentry->d_inode in SELinux to get rid
      of direct references to d_inode outside of the VFS.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      2c616d4d
    • David Howells's avatar
      Smack: Use d_is_positive() rather than testing dentry->d_inode · 8802565b
      David Howells authored
      Use d_is_positive() rather than testing dentry->d_inode in Smack to get rid of
      direct references to d_inode outside of the VFS.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      8802565b
    • David Howells's avatar
      TOMOYO: Use d_is_dir() rather than d_inode and S_ISDIR() · e656a8eb
      David Howells authored
      Use d_is_dir() rather than d_inode and S_ISDIR().  Note that this will include
      fake directories such as automount triggers.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      e656a8eb
    • David Howells's avatar
      Apparmor: Use d_is_positive/negative() rather than testing dentry->d_inode · 729b8a3d
      David Howells authored
      Use d_is_positive(dentry) or d_is_negative(dentry) rather than testing
      dentry->d_inode as the dentry may cover another layer that has an inode when
      the top layer doesn't or may hold a 0,0 chardev that's actually a whiteout.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      729b8a3d
    • David Howells's avatar
      Apparmor: mediated_filesystem() should use dentry->d_sb not inode->i_sb · 7ac2856d
      David Howells authored
      mediated_filesystem() should use dentry->d_sb not dentry->d_inode->i_sb and
      should avoid file_inode() also since it is really dealing with the path.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      7ac2856d
    • David Howells's avatar
      VFS: Split DCACHE_FILE_TYPE into regular and special types · 44bdb5e5
      David Howells authored
      Split DCACHE_FILE_TYPE into DCACHE_REGULAR_TYPE (dentries representing regular
      files) and DCACHE_SPECIAL_TYPE (representing blockdev, chardev, FIFO and
      socket files).
      
      d_is_reg() and d_is_special() are added to detect these subtypes and
      d_is_file() is left as the union of the two.
      
      This allows a number of places that use S_ISREG(dentry->d_inode->i_mode) to
      use d_is_reg(dentry) instead.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      44bdb5e5
    • David Howells's avatar
      VFS: Add a fallthrough flag for marking virtual dentries · df1a085a
      David Howells authored
      Add a DCACHE_FALLTHRU flag to indicate that, in a layered filesystem, this is
      a virtual dentry that covers another one in a lower layer that should be used
      instead.  This may be recorded on medium if directory integration is stored
      there.
      
      The flag can be set with d_set_fallthru() and tested with d_is_fallthru().
      
      Original-author: Valerie Aurora <vaurora@redhat.com>
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      df1a085a
    • David Howells's avatar
      VFS: Add a whiteout dentry type · e7f7d225
      David Howells authored
      Add DCACHE_WHITEOUT_TYPE and provide a d_is_whiteout() accessor function.  A
      d_is_miss() accessor is also added for ordinary cache misses and
      d_is_negative() is modified to indicate either an ordinary miss or an enforced
      miss (whiteout).
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      e7f7d225
    • David Howells's avatar
      VFS: Introduce inode-getting helpers for layered/unioned fs environments · 155e35d4
      David Howells authored
      Introduce some function for getting the inode (and also the dentry) in an
      environment where layered/unioned filesystems are in operation.
      
      The problem is that we have places where we need *both* the union dentry and
      the lower source or workspace inode or dentry available, but we can only have
      a handle on one of them.  Therefore we need to derive the handle to the other
      from that.
      
      The idea is to introduce an extra field in struct dentry that allows the union
      dentry to refer to and pin the lower dentry.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      155e35d4
    • Linus Torvalds's avatar
      Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus · a135c717
      Linus Torvalds authored
      Pull MIPS updates from Ralf Baechle:
       "This is the main pull request for MIPS:
      
         - a number of fixes that didn't make the 3.19 release.
      
         - a number of cleanups.
      
         - preliminary support for Cavium's Octeon 3 SOCs which feature up to
           48 MIPS64 R3 cores with FPU and hardware virtualization.
      
         - support for MIPS R6 processors.
      
           Revision 6 of the MIPS architecture is a major revision of the MIPS
           architecture which does away with many of original sins of the
           architecture such as branch delay slots.  This and other changes in
           R6 require major changes throughout the entire MIPS core
           architecture code and make up for the lion share of this pull
           request.
      
         - finally some preparatory work for eXtendend Physical Address
           support, which allows support of up to 40 bit of physical address
           space on 32 bit processors"
      
           [ Ahh, MIPS can't leave the PAE brain damage alone.  It's like
             every CPU architect has to make that mistake, but pee in the snow
             by changing the TLA.  But whether it's called PAE, LPAE or XPA,
             it's horrid crud   - Linus ]
      
      * 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: (114 commits)
        MIPS: sead3: Corrected get_c0_perfcount_int
        MIPS: mm: Remove dead macro definitions
        MIPS: OCTEON: irq: add CIB and other fixes
        MIPS: OCTEON: Don't do acknowledge operations for level triggered irqs.
        MIPS: OCTEON: More OCTEONIII support
        MIPS: OCTEON: Remove setting of processor specific CVMCTL icache bits.
        MIPS: OCTEON: Core-15169 Workaround and general CVMSEG cleanup.
        MIPS: OCTEON: Update octeon-model.h code for new SoCs.
        MIPS: OCTEON: Implement DCache errata workaround for all CN6XXX
        MIPS: OCTEON: Add little-endian support to asm/octeon/octeon.h
        MIPS: OCTEON: Implement the core-16057 workaround
        MIPS: OCTEON: Delete unused COP2 saving code
        MIPS: OCTEON: Use correct instruction to read 64-bit COP0 register
        MIPS: OCTEON: Save and restore CP2 SHA3 state
        MIPS: OCTEON: Fix FP context save.
        MIPS: OCTEON: Save/Restore wider multiply registers in OCTEON III CPUs
        MIPS: boot: Provide more uImage options
        MIPS: Remove unneeded #ifdef __KERNEL__ from asm/processor.h
        MIPS: ip22-gio: Remove legacy suspend/resume support
        mips: pci: Add ifdef around pci_proc_domain
        ...
      a135c717
    • Linus Torvalds's avatar
      Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc · 21770332
      Linus Torvalds authored
      Pull ARM SoC fixes from Arnd Bergmann:
       "A few fixes that came in too late to make it into the first set of
        pull requests but would still be nice to have in -rc1.
      
        The majority of these are trivial build fixes for bugs that I found
        myself using randconfig testing, and a set of two patches from Uwe to
        mark DT strings as 'const' where appropriate, to resolve inconsistent
        section attributes"
      
      * tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
        ARM: make of_device_ids const
        ARM: make arrays containing machine compatible strings const
        ARM: mm: Remove Kconfig symbol CACHE_PL310
        ARM: rockchip: force built-in regulator support for PM
        ARM: mvebu: build armada375-smp code conditionally
        ARM: sti: always enable RESET_CONTROLLER
        ARM: rockchip: make rockchip_suspend_init conditional
        ARM: ixp4xx: fix {in,out}s{bwl} data types
        ARM: prima2: do not select SMP_ON_UP
        ARM: at91: fix pm declarations
        ARM: davinci: multi-soc kernels require AUTO_ZRELADDR
        ARM: davinci: davinci_cfg_reg cannot be init
        ARM: BCM: put back ARCH_MULTI_V7 dependency for mobile
        ARM: vexpress: use ARM_CPU_SUSPEND if needed
        ARM: dts: add I2C device nodes for Broadcom Cygnus
        ARM: dts: BCM63xx: fix L2 cache properties
      21770332
    • Linus Torvalds's avatar
      Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi · c8c6c9ba
      Linus Torvalds authored
      Pull misc SCSI patches from James Bottomley:
       "This is a short patch set representing a couple of left overs from the
        merge window (debug removal and MAINTAINER changes).
      
        Plus one merge window regression (the local workqueue for hpsa) and a
        set of bug fixes for several issues (two for scsi-mq and the rest an
        assortment of long standing stuff, all cc'd to stable)"
      
      * tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
        sg: fix EWOULDBLOCK errors with scsi-mq
        sg: fix unkillable I/O wait deadlock with scsi-mq
        sg: fix read() error reporting
        wd719x: add missing .module to wd719x_template
        hpsa: correct compiler warnings introduced by hpsa-add-local-workqueue patch
        fixed invalid assignment of 64bit mask to host dma_boundary for scatter gather segment boundary limit.
        fcoe: Transition maintainership to Vasu
        am53c974: remove left-over debugging code
      c8c6c9ba
  5. 21 Feb, 2015 2 commits
    • Linus Torvalds's avatar
      Merge tag 'xfs-pnfs-for-linus-3.20-rc1' of... · 93aaa830
      Linus Torvalds authored
      Merge tag 'xfs-pnfs-for-linus-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs
      
      Pull xfs pnfs block layout support from Dave Chinner:
       "This contains the changes to XFS needed to support the PNFS block
        layout server that you pulled in through Bruce's NFS server tree
        merge.
      
        I originally thought that I'd need to merge changes into the NFS
        server side, but Bruce had already picked them up and so this is
        purely changes to the fs/xfs/ codebase.
      
        Summary:
      
        This update contains the implementation of the PNFS server export
        methods that enable use of XFS filesystems as a block layout target"
      
      * tag 'xfs-pnfs-for-linus-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs:
        xfs: recall pNFS layouts on conflicting access
        xfs: implement pNFS export operations
      93aaa830
    • Linus Torvalds's avatar
      Merge tag 'nfs-for-3.20-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs · 24a52e41
      Linus Torvalds authored
      Pull more NFS client updates from Trond Myklebust:
       "Highlights include:
      
         - Fix a use-after-free in decode_cb_sequence_args()
         - Fix a compile error when #undef CONFIG_PROC_FS
         - NFSv4.1 backchannel spinlocking issue
         - Cleanups in the NFS unstable write code requested by Linus
         - NFSv4.1 fix issues when the server denies our backchannel request
         - Cleanups in create_session and bind_conn_to_session"
      
      * tag 'nfs-for-3.20-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
        NFSv4.1: Clean up bind_conn_to_session
        NFSv4.1: Always set up a forward channel when binding the session
        NFSv4.1: Don't set up a backchannel if the server didn't agree to do so
        NFSv4.1: Clean up create_session
        pnfs: Refactor the *_layout_mark_request_commit to use pnfs_layout_mark_request_commit
        NFSv4: Kill unused nfs_inode->delegation_state field
        NFS: struct nfs_commit_info.lock must always point to inode->i_lock
        nfs: Can call nfs_clear_page_commit() instead
        nfs: Provide and use helper functions for marking a page as unstable
        SUNRPC: Always manipulate rpc_rqst::rq_bc_pa_list under xprt->bc_pa_lock
        SUNRPC: Fix a compile error when #undef CONFIG_PROC_FS
        NFSv4.1: Convert open-coded array allocation calls to kmalloc_array()
        NFSv4.1: Fix a kfree() of uninitialised pointers in decode_cb_sequence_args
      24a52e41