1. 06 Jul, 2017 1 commit
    • David Howells's avatar
      VFS: Don't use save/replace_mount_options if not using generic_show_options · c3d98ea0
      David Howells authored
      btrfs, debugfs, reiserfs and tracefs call save_mount_options() and reiserfs
      calls replace_mount_options(), but they then implement their own
      ->show_options() methods and don't touch s_options, rendering the saved
      options unnecessary.  I'm trying to eliminate s_options to make it easier
      to implement a context-based mount where the mount options can be passed
      individually over a file descriptor.
      
      Remove the calls to save/replace_mount_options() call in these cases.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      cc: Chris Mason <clm@fb.com>
      cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
      cc: Steven Rostedt <rostedt@goodmis.org>
      cc: linux-btrfs@vger.kernel.org
      cc: reiserfs-devel@vger.kernel.org
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      c3d98ea0
  2. 27 Apr, 2017 1 commit
  3. 28 Sep, 2016 1 commit
  4. 29 May, 2016 1 commit
  5. 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>
      5955102c
  6. 05 Nov, 2015 1 commit
  7. 01 Jul, 2015 1 commit
  8. 23 Jun, 2015 1 commit
  9. 03 Feb, 2015 3 commits
    • Steven Rostedt (Red Hat)'s avatar
      tracing: Have mkdir and rmdir be part of tracefs · eae47358
      Steven Rostedt (Red Hat) authored
      The tracing "instances" directory can create sub tracing buffers
      with mkdir, and remove them with rmdir. As a mkdir will also create
      all the files and directories that control the sub buffer the inode
      mutexes need to be released before this is done, to avoid deadlocks.
      It is better to let the tracing system unlock the inode mutexes before
      calling the functions that create the files within the new directory
      (or deletes the files from the one being destroyed).
      
      Now that tracing has been converted over to tracefs, the tracefs file
      system can be modified to accommodate this feature. It still releases
      the locks, but the filesystem itself can take care of the ugly
      business and let the user just do what it needs.
      
      The tracing system now attaches a descriptor to the directory dentry
      that can have userspace create or remove sub directories. If this
      descriptor does not exist for a dentry, then that dentry can not be
      used to create other directories. This descriptor holds a mkdir and
      rmdir method that only takes a character string as an argument.
      
      The tracefs file system will first make a copy of the dentry name
      before releasing the locks. Then it will pass the copied name to the
      methods. It is up to the tracing system that supplied the methods to
      handle races with duplicate names and such as all the inode mutexes
      would be released when the functions are called.
      
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      eae47358
    • Steven Rostedt (Red Hat)'s avatar
      tracefs: Add directory /sys/kernel/tracing · cc31004a
      Steven Rostedt (Red Hat) authored
      When tracefs is configured, have the directory /sys/kernel/tracing appear
      just like /sys/kernel/debug appears when debugfs is configured.
      
      This will give a consistent place for system admins to mount tracefs.
      Acked-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      cc31004a
    • Steven Rostedt (Red Hat)'s avatar
      tracefs: Add new tracefs file system · 4282d606
      Steven Rostedt (Red Hat) authored
      Add a separate file system to handle the tracing directory. Currently it
      is part of debugfs, but that is starting to show its limits.
      
      One thing is that in order to access the tracing infrastructure, you need
      to mount debugfs. As that includes debugging from all sorts of sub systems
      in the kernel, it is not considered advisable to mount such an all
      encompassing debugging system.
      
      Having the tracing system in its own file systems gives access to the
      tracing sub system without needing to include all other systems.
      
      Another problem with tracing using the debugfs system is that the
      instances use mkdir to create sub buffers. debugfs does not support mkdir
      from userspace so to implement it, special hacks were used. By controlling
      the file system that the tracing infrastructure uses, this can be properly
      done without hacks.
      Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      4282d606