1. 30 Jul, 2012 1 commit
  2. 23 Mar, 2011 1 commit
  3. 21 Jun, 2009 1 commit
  4. 18 Jun, 2009 2 commits
  5. 07 Apr, 2009 2 commits
    • Serge E. Hallyn's avatar
      namespaces: ipc namespaces: implement support for posix msqueues · 7eafd7c7
      Serge E. Hallyn authored
      Implement multiple mounts of the mqueue file system, and link it to usage
      of CLONE_NEWIPC.
      
      Each ipc ns has a corresponding mqueuefs superblock.  When a user does
      clone(CLONE_NEWIPC) or unshare(CLONE_NEWIPC), the unshare will cause an
      internal mount of a new mqueuefs sb linked to the new ipc ns.
      
      When a user does 'mount -t mqueue mqueue /dev/mqueue', he mounts the
      mqueuefs superblock.
      
      Posix message queues can be worked with both through the mq_* system calls
      (see mq_overview(7)), and through the VFS through the mqueue mount.  Any
      usage of mq_open() and friends will work with the acting task's ipc
      namespace.  Any actions through the VFS will work with the mqueuefs in
      which the file was created.  So if a user doesn't remount mqueuefs after
      unshare(CLONE_NEWIPC), mq_open("/ab") will not be reflected in "ls
      /dev/mqueue".
      
      If task a mounts mqueue for ipc_ns:1, then clones task b with a new ipcns,
      ipcns:2, and then task a is the last task in ipc_ns:1 to exit, then (1)
      ipc_ns:1 will be freed, (2) it's superblock will live on until task b
      umounts the corresponding mqueuefs, and vfs actions will continue to
      succeed, but (3) sb->s_fs_info will be NULL for the sb corresponding to
      the deceased ipc_ns:1.
      
      To make this happen, we must protect the ipc reference count when
      
      a) a task exits and drops its ipcns->count, since it might be dropping
         it to 0 and freeing the ipcns
      
      b) a task accesses the ipcns through its mqueuefs interface, since it
         bumps the ipcns refcount and might race with the last task in the ipcns
         exiting.
      
      So the kref is changed to an atomic_t so we can use
      atomic_dec_and_lock(&ns->count,mq_lock), and every access to the ipcns
      through ns = mqueuefs_sb->s_fs_info is protected by the same lock.
      Signed-off-by: default avatarCedric Le Goater <clg@fr.ibm.com>
      Signed-off-by: default avatarSerge E. Hallyn <serue@us.ibm.com>
      Cc: Alexey Dobriyan <adobriyan@gmail.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      7eafd7c7
    • Serge E. Hallyn's avatar
      namespaces: mqueue ns: move mqueue_mnt into struct ipc_namespace · 614b84cf
      Serge E. Hallyn authored
      Move mqueue vfsmount plus a few tunables into the ipc_namespace struct.
      The CONFIG_IPC_NS boolean and the ipc_namespace struct will serve both the
      posix message queue namespaces and the SYSV ipc namespaces.
      
      The sysctl code will be fixed separately in patch 3.  After just this
      patch, making a change to posix mqueue tunables always changes the values
      in the initial ipc namespace.
      Signed-off-by: default avatarCedric Le Goater <clg@fr.ibm.com>
      Signed-off-by: default avatarSerge E. Hallyn <serue@us.ibm.com>
      Cc: Alexey Dobriyan <adobriyan@gmail.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      614b84cf
  6. 25 Jul, 2008 1 commit
  7. 29 Apr, 2008 4 commits
  8. 08 Feb, 2008 3 commits
    • Pierre Peiffer's avatar
      IPC: make struct ipc_ids static in ipc_namespace · ed2ddbf8
      Pierre Peiffer authored
      Each ipc_namespace contains a table of 3 pointers to struct ipc_ids (3 for
      msg, sem and shm, structure used to store all ipcs) These 'struct ipc_ids'
      are dynamically allocated for each icp_namespace as the ipc_namespace
      itself (for the init namespace, they are initialized with pointers to
      static variables instead)
      
      It is so for historical reason: in fact, before the use of idr to store the
      ipcs, the ipcs were stored in tables of variable length, depending of the
      maximum number of ipc allowed.  Now, these 'struct ipc_ids' have a fixed
      size.  As they are allocated in any cases for each new ipc_namespace, there
      is no gain of memory in having them allocated separately of the struct
      ipc_namespace.
      
      This patch proposes to make this table static in the struct ipc_namespace.
      Thus, we can allocate all in once and get rid of all the code needed to
      allocate and free these ipc_ids separately.
      Signed-off-by: default avatarPierre Peiffer <pierre.peiffer@bull.net>
      Acked-by: default avatarCedric Le Goater <clg@fr.ibm.com>
      Cc: Pavel Emelyanov <xemul@openvz.org>
      Cc: Nadia Derbey <Nadia.Derbey@bull.net>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      ed2ddbf8
    • Pavel Emelyanov's avatar
      ipc: uninline some code from util.h · b2d75cdd
      Pavel Emelyanov authored
      ipc_lock_check_down(), ipc_lock_check() and ipcget() seem too large to be
      inline.  Besides, they give no optimization being inline as they perform
      calls inside in any case.
      
      Moving them into ipc/util.c saves 500 bytes of vmlinux and shortens IPC
      internal API.
      
      $ ./scripts/bloat-o-meter vmlinux-orig vmlinux
      add/remove: 3/2 grow/shrink: 0/10 up/down: 490/-989 (-499)
      function                                     old     new   delta
      ipcget                                         -     392    +392
      ipc_lock_check_down                            -      49     +49
      ipc_lock_check                                 -      49     +49
      sys_semget                                   119     105     -14
      sys_shmget                                   108      86     -22
      sys_msgget                                   100      78     -22
      do_msgsnd                                    665     631     -34
      do_msgrcv                                    680     644     -36
      do_shmat                                     771     733     -38
      sys_msgctl                                  1302    1229     -73
      ipcget_new                                    80       -     -80
      sys_semtimedop                              1534    1452     -82
      sys_semctl                                  2034    1922    -112
      sys_shmctl                                  1919    1765    -154
      ipcget_public                                322       -    -322
      
      The ipcget() growth is the result of gcc inlining of currently static
      ipcget_new/_public.
      Signed-off-by: default avatarPavel Emelyanov <xemul@openvz.org>
      Cc: Nadia Derbey <Nadia.Derbey@bull.net>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b2d75cdd
    • Pavel Emelyanov's avatar
      namespaces: move the IPC namespace under IPC_NS option · ae5e1b22
      Pavel Emelyanov authored
      Currently the IPC namespace management code is spread over the ipc/*.c files.
      I moved this code into ipc/namespace.c file which is compiled out when needed.
      
      The linux/ipc_namespace.h file is used to store the prototypes of the
      functions in namespace.c and the stubs for NAMESPACES=n case.  This is done
      so, because the stub for copy_ipc_namespace requires the knowledge of the
      CLONE_NEWIPC flag, which is in sched.h.  But the linux/ipc.h file itself in
      included into many many .c files via the sys.h->sem.h sequence so adding the
      sched.h into it will make all these .c depend on sched.h which is not that
      good.  On the other hand the knowledge about the namespaces stuff is required
      in 4 .c files only.
      
      Besides, this patch compiles out some auxiliary functions from ipc/sem.c,
      msg.c and shm.c files.  It turned out that moving these functions into
      namespaces.c is not that easy because they use many other calls and macros
      from the original file.  Moving them would make this patch complicated.  On
      the other hand all these functions can be consolidated, so I will send a
      separate patch doing this a bit later.
      Signed-off-by: default avatarPavel Emelyanov <xemul@openvz.org>
      Acked-by: default avatarSerge Hallyn <serue@us.ibm.com>
      Cc: Cedric Le Goater <clg@fr.ibm.com>
      Cc: "Eric W. Biederman" <ebiederm@xmission.com>
      Cc: Herbert Poetzl <herbert@13thfloor.at>
      Cc: Kirill Korotaev <dev@sw.ru>
      Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      ae5e1b22
  9. 19 Oct, 2007 10 commits
  10. 16 Jul, 2007 1 commit
  11. 03 Nov, 2006 1 commit
    • Pavel Emelianov's avatar
      [PATCH] Fix ipc entries removal · c7e12b83
      Pavel Emelianov authored
      Fix two issuses related to ipc_ids->entries freeing.
      
      1. When freeing ipc namespace we need to free entries allocated
         with ipc_init_ids().
      
      2. When removing old entries in grow_ary() ipc_rcu_putref()
         may be called on entries set to &ids->nullentry earlier in
         ipc_init_ids().
         This is almost impossible without namespaces, but with
         them this situation becomes possible.
      
      Found during OpenVZ testing after obvious leaks in beancounters.
      Signed-off-by: default avatarPavel Emelianov <xemul@openvz.org>
      Cc: Kirill Korotaev <dev@openvz.org>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      c7e12b83
  12. 02 Oct, 2006 1 commit
  13. 26 Mar, 2006 1 commit
  14. 14 Jan, 2006 1 commit
  15. 07 Sep, 2005 1 commit
  16. 12 Jul, 2005 1 commit
  17. 16 Apr, 2005 1 commit
    • Linus Torvalds's avatar
      Linux-2.6.12-rc2 · 1da177e4
      Linus Torvalds authored
      Initial git repository build. I'm not bothering with the full history,
      even though we have it. We can create a separate "historical" git
      archive of that later if we want to, and in the meantime it's about
      3.2GB when imported into git - space that would just make the early
      git days unnecessarily complicated, when we don't have a lot of good
      infrastructure for it.
      
      Let it rip!
      1da177e4