1. 16 Dec, 2016 2 commits
  2. 15 Sep, 2016 2 commits
  3. 28 Jul, 2016 1 commit
  4. 22 Jan, 2016 1 commit
    • Al Viro's avatar
      wrappers for ->i_mutex access · 5955102c
      Al Viro authored
      parallel to mutex_{lock,unlock,trylock,is_locked,lock_nested},
      inode_foo(inode) being mutex_foo(&inode->i_mutex).
      Please, use those for access to ->i_mutex; over the coming cycle
      ->i_mutex will become rwsem, with ->lookup() done with it held
      only shared.
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
  5. 09 Jan, 2016 1 commit
  6. 01 Jan, 2016 1 commit
  7. 08 Dec, 2015 1 commit
    • Christoph Hellwig's avatar
      vfs: pull btrfs clone API to vfs layer · 04b38d60
      Christoph Hellwig authored
      The btrfs clone ioctls are now adopted by other file systems, with NFS
      and CIFS already having support for them, and XFS being under active
      development.  To avoid growth of various slightly incompatible
      implementations, add one to the VFS.  Note that clones are different from
      file copies in several ways:
       - they are atomic vs other writers
       - they support whole file clones
       - they support 64-bit legth clones
       - they do not allow partial success (aka short writes)
       - clones are expected to be a fast metadata operation
      Because of that it would be rather cumbersome to try to piggyback them on
      top of the recent clone_file_range infrastructure.  The converse isn't
      true and the clone_file_range system call could try clone file range as
      a first attempt to copy, something that further patches will enable.
      Based on earlier work from Peng Tao.
      Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
  8. 10 Feb, 2015 1 commit
  9. 17 Nov, 2014 1 commit
    • Benjamin Marzinski's avatar
      fs: add freeze_super/thaw_super fs hooks · 48b6bca6
      Benjamin Marzinski authored
      Currently, freezing a filesystem involves calling freeze_super, which locks
      sb->s_umount and then calls the fs-specific freeze_fs hook. This makes it
      hard for gfs2 (and potentially other cluster filesystems) to use the vfs
      freezing code to do freezes on all the cluster nodes.
      In order to communicate that a freeze has been requested, and to make sure
      that only one node is trying to freeze at a time, gfs2 uses a glock
      (sd_freeze_gl). The problem is that there is no hook for gfs2 to acquire
      this lock before calling freeze_super. This means that two nodes can
      attempt to freeze the filesystem by both calling freeze_super, acquiring
      the sb->s_umount lock, and then attempting to grab the cluster glock
      sd_freeze_gl. Only one will succeed, and the other will be stuck in
      freeze_super, making it impossible to finish freezing the node.
      To solve this problem, this patch adds the freeze_super and thaw_super
      hooks.  If a filesystem implements these hooks, they are called instead of
      the vfs freeze_super and thaw_super functions. This means that every
      filesystem that implements these hooks must call the vfs freeze_super and
      thaw_super functions itself within the hook function to make use of the vfs
      freezing code.
      Reviewed-by: default avatarJan Kara <jack@suse.cz>
      Signed-off-by: default avatarBenjamin Marzinski <bmarzins@redhat.com>
      Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
  10. 07 Nov, 2014 1 commit
  11. 25 Oct, 2013 1 commit
  12. 23 Feb, 2013 1 commit
  13. 27 Sep, 2012 1 commit
  14. 29 Feb, 2012 1 commit
  15. 05 Jan, 2012 1 commit
    • Linus Torvalds's avatar
      vfs: fix up ENOIOCTLCMD error handling · 07d106d0
      Linus Torvalds authored
      We're doing some odd things there, which already messes up various users
      (see the net/socket.c code that this removes), and it was going to add
      yet more crud to the block layer because of the incorrect error code
      ENOIOCTLCMD is not an error return that should be returned to user mode
      from the "ioctl()" system call, but it should *not* be translated as
      EINVAL ("Invalid argument").  It should be translated as ENOTTY
      ("Inappropriate ioctl for device").
      That EINVAL confusion has apparently so permeated some code that the
      block layer actually checks for it, which is sad.  We continue to do so
      for now, but add a big comment about how wrong that is, and we should
      remove it entirely eventually.  In the meantime, this tries to keep the
      changes localized to just the EINVAL -> ENOTTY fix, and removing code
      that makes it harder to do the right thing.
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
  16. 21 Mar, 2011 1 commit
  17. 03 Feb, 2011 1 commit
  18. 17 Jan, 2011 1 commit
    • Namhyung Kim's avatar
      fs: fix address space warnings in ioctl_fiemap() · ecf5632d
      Namhyung Kim authored
      The fi_extents_start field of struct fiemap_extent_info is a
      user pointer but was not marked as __user. This makes sparse
      emit following warnings:
        CHECK   fs/ioctl.c
      fs/ioctl.c:114:26: warning: incorrect type in argument 1 (different address spaces)
      fs/ioctl.c:114:26:    expected void [noderef] <asn:1>*dst
      fs/ioctl.c:114:26:    got struct fiemap_extent *[assigned] dest
      fs/ioctl.c:202:14: warning: incorrect type in argument 1 (different address spaces)
      fs/ioctl.c:202:14:    expected void const volatile [noderef] <asn:1>*<noident>
      fs/ioctl.c:202:14:    got struct fiemap_extent *[assigned] fi_extents_start
      fs/ioctl.c:212:27: warning: incorrect type in argument 1 (different address spaces)
      fs/ioctl.c:212:27:    expected void [noderef] <asn:1>*dst
      fs/ioctl.c:212:27:    got char *<noident>
      Also add 'ufiemap' variable to eliminate unnecessary casts.
      Signed-off-by: default avatarNamhyung Kim <namhyung@gmail.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
  19. 20 Nov, 2010 1 commit
  20. 17 Nov, 2010 1 commit
  21. 28 Oct, 2010 1 commit
    • Lukas Czerner's avatar
      fs: Add FITRIM ioctl · 367a51a3
      Lukas Czerner authored
      Adds an filesystem independent ioctl to allow implementation of file
      system batched discard support. I takes fstrim_range structure as an
      argument. fstrim_range is definec in the include/fs.h and its
      definition is as follows.
      struct fstrim_range {
      start	- first Byte to trim
      len	- number of Bytes to trim from start
      minlen	- minimum extent length to trim, free extents shorter than this
      	  number of Bytes will be ignored. This will be rounded up to fs
      	  block size.
      It is also possible to specify NULL as an argument. In this case the
      arguments will set itself as follows:
      start = 0;
      len = ULLONG_MAX;
      minlen = 0;
      So it will trim the whole file system at one run.
      After the FITRIM is done, the number of actually discarded Bytes is stored
      in fstrim_range.len to give the user better insight on how much storage
      space has been really released for wear-leveling.
      Signed-off-by: default avatarLukas Czerner <lczerner@redhat.com>
      Reviewed-by: default avatarDmitry Monakhov <dmonakhov@openvz.org>
      Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
  22. 13 Aug, 2010 1 commit
  23. 21 May, 2010 1 commit
    • Josef Bacik's avatar
      Introduce freeze_super and thaw_super for the fsfreeze ioctl · 18e9e510
      Josef Bacik authored
      Currently the way we do freezing is by passing sb>s_bdev to freeze_bdev and then
      letting it do all the work.  But freezing is more of an fs thing, and doesn't
      really have much to do with the bdev at all, all the work gets done with the
      super.  In btrfs we do not populate s_bdev, since we can have multiple bdev's
      for one fs and setting s_bdev makes removing devices from a pool kind of tricky.
      This means that freezing a btrfs filesystem fails, which causes us to corrupt
      with things like tux-on-ice which use the fsfreeze mechanism.  So instead of
      populating sb->s_bdev with a random bdev in our pool, I've broken the actual fs
      freezing stuff into freeze_super and thaw_super.  These just take the
      super_block that we're freezing and does the appropriate work.  It's basically
      just copy and pasted from freeze_bdev.  I've then converted freeze_bdev over to
      use the new super helpers.  I've tested this with ext4 and btrfs and verified
      everything continues to work the same as before.
      The only new gotcha is multiple calls to the fsfreeze ioctl will return EBUSY if
      the fs is already frozen.  I thought this was a better solution than adding a
      freeze counter to the super_block, but if everybody hates this idea I'm open to
      suggestions.  Thanks,
      Signed-off-by: default avatarJosef Bacik <josef@redhat.com>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
  24. 23 Apr, 2010 1 commit
  25. 12 Nov, 2009 1 commit
  26. 24 Sep, 2009 1 commit
  27. 24 Jun, 2009 1 commit
  28. 17 Jun, 2009 1 commit
  29. 06 May, 2009 1 commit
  30. 13 May, 2009 1 commit
  31. 16 Mar, 2009 3 commits
    • Jonathan Corbet's avatar
      Rationalize fasync return values · 60aa4924
      Jonathan Corbet authored
      Most fasync implementations do something like:
           return fasync_helper(...);
      But fasync_helper() will return a positive value at times - a feature used
      in at least one place.  Thus, a number of other drivers do:
           err = fasync_helper(...);
           if (err < 0)
                   return err;
           return 0;
      In the interests of consistency and more concise code, it makes sense to
      map positive return values onto zero where ->fasync() is called.
      Cc: Al Viro <viro@ZenIV.linux.org.uk>
      Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
    • Jonathan Corbet's avatar
      Move FASYNC bit handling to f_op->fasync() · 76398425
      Jonathan Corbet authored
      Removing the BKL from FASYNC handling ran into the challenge of keeping the
      setting of the FASYNC bit in filp->f_flags atomic with regard to calls to
      the underlying fasync() function.  Andi Kleen suggested moving the handling
      of that bit into fasync(); this patch does exactly that.  As a result, we
      have a couple of internal API changes: fasync() must now manage the FASYNC
      bit, and it will be called without the BKL held.
      As it happens, every fasync() implementation in the kernel with one
      exception calls fasync_helper().  So, if we make fasync_helper() set the
      FASYNC bit, we can avoid making any changes to the other fasync()
      functions - as long as those functions, themselves, have proper locking.
      Most fasync() implementations do nothing but call fasync_helper() - which
      has its own lock - so they are easily verified as correct.  The BKL had
      already been pushed down into the rest.
      The networking code has its own version of fasync_helper(), so that code
      has been augmented with explicit FASYNC bit handling.
      Cc: Al Viro <viro@ZenIV.linux.org.uk>
      Cc: David Miller <davem@davemloft.net>
      Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
      Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
    • Jonathan Corbet's avatar
      Use f_lock to protect f_flags · db1dd4d3
      Jonathan Corbet authored
      Traditionally, changes to struct file->f_flags have been done under BKL
      protection, or with no protection at all.  This patch causes all f_flags
      changes after file open/creation time to be done under protection of
      f_lock.  This allows the removal of some BKL usage and fixes a number of
      longstanding (if microscopic) races.
      Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
      Cc: Al Viro <viro@ZenIV.linux.org.uk>
      Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
  32. 14 Jan, 2009 1 commit
  33. 10 Jan, 2009 1 commit
    • Takashi Sato's avatar
      filesystem freeze: implement generic freeze feature · fcccf502
      Takashi Sato authored
      The ioctls for the generic freeze feature are below.
      o Freeze the filesystem
        int ioctl(int fd, int FIFREEZE, arg)
          fd: The file descriptor of the mountpoint
          FIFREEZE: request code for the freeze
          arg: Ignored
          Return value: 0 if the operation succeeds. Otherwise, -1
      o Unfreeze the filesystem
        int ioctl(int fd, int FITHAW, arg)
          fd: The file descriptor of the mountpoint
          FITHAW: request code for unfreeze
          arg: Ignored
          Return value: 0 if the operation succeeds. Otherwise, -1
          Error number: If the filesystem has already been unfrozen,
                        errno is set to EINVAL.
      [akpm@linux-foundation.org: fix CONFIG_BLOCK=n]
      Signed-off-by: default avatarTakashi Sato <t-sato@yk.jp.nec.com>
      Signed-off-by: default avatarMasayuki Hamaguchi <m-hamaguchi@ys.jp.nec.com>
      Cc: <xfs-masters@oss.sgi.com>
      Cc: <linux-ext4@vger.kernel.org>
      Cc: Christoph Hellwig <hch@lst.de>
      Cc: Dave Kleikamp <shaggy@austin.ibm.com>
      Cc: Dave Chinner <david@fromorbit.com>
      Cc: Alasdair G Kergon <agk@redhat.com>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
  34. 05 Jan, 2009 1 commit
    • Steven Whitehouse's avatar
      GFS2: Support for FIEMAP ioctl · e9079cce
      Steven Whitehouse authored
      This patch implements the FIEMAP ioctl for GFS2. We can use the generic
      code (aside from a lock order issue, solved as per Ted Tso's suggestion)
      for which I've introduced a new variant of the generic function. We also
      have one exception to deal with, namely stuffed files, so we do that
      "by hand", setting all the required flags.
      This has been tested with a modified (I could only find an old version) of
      Eric's test program, and appears to work correctly.
      This patch does not currently support FIEMAP of xattrs, but the plan is to add
      that feature at some future point.
      Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
      Cc: Theodore Tso <tytso@mit.edu>
      Cc: Eric Sandeen <sandeen@redhat.com>
  35. 05 Dec, 2008 1 commit
  36. 12 Oct, 2008 1 commit