| Age | Commit message (Collapse) | Author | Files | Lines | |
|---|---|---|---|---|---|
| 2009-04-07 | namespaces: ipc namespaces: implement support for posix msqueues | Serge E. Hallyn | 1 | -6/+3 | |
| 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: Cedric Le Goater <[email protected]> Signed-off-by: Serge E. Hallyn <[email protected]> Cc: Alexey Dobriyan <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> | |||||
| 2009-04-07 | namespaces: mqueue ns: move mqueue_mnt into struct ipc_namespace | Serge E. Hallyn | 1 | -0/+22 | |
| 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: Cedric Le Goater <[email protected]> Signed-off-by: Serge E. Hallyn <[email protected]> Cc: Alexey Dobriyan <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> | |||||
| 2006-12-13 | [PATCH] getting rid of all casts of k[cmz]alloc() calls | Robert P. J. Day | 1 | -2/+2 | |
| Run this: #!/bin/sh for f in $(grep -Erl "\([^\)]*\) *k[cmz]alloc" *) ; do echo "De-casting $f..." perl -pi -e "s/ ?= ?\([^\)]*\) *(k[cmz]alloc) *\(/ = \1\(/" $f done And then go through and reinstate those cases where code is casting pointers to non-pointers. And then drop a few hunks which conflicted with outstanding work. Cc: Russell King <[email protected]>, Ian Molton <[email protected]> Cc: Mikael Starvik <[email protected]> Cc: Yoshinori Sato <[email protected]> Cc: Roman Zippel <[email protected]> Cc: Geert Uytterhoeven <[email protected]> Cc: Ralf Baechle <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Kyle McMartin <[email protected]> Cc: Benjamin Herrenschmidt <[email protected]> Cc: Martin Schwidefsky <[email protected]> Cc: "David S. Miller" <[email protected]> Cc: Jeff Dike <[email protected]> Cc: Greg KH <[email protected]> Cc: Jens Axboe <[email protected]> Cc: Paul Fulghum <[email protected]> Cc: Alan Cox <[email protected]> Cc: Karsten Keil <[email protected]> Cc: Mauro Carvalho Chehab <[email protected]> Cc: Jeff Garzik <[email protected]> Cc: James Bottomley <[email protected]> Cc: Ian Kent <[email protected]> Cc: Steven French <[email protected]> Cc: David Woodhouse <[email protected]> Cc: Neil Brown <[email protected]> Cc: Jaroslav Kysela <[email protected]> Cc: Takashi Iwai <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> | |||||
| 2006-10-03 | fix file specification in comments | Uwe Zeisberger | 1 | -1/+1 | |
| Many files include the filename at the beginning, serveral used a wrong one. Signed-off-by: Uwe Zeisberger <[email protected]> Signed-off-by: Adrian Bunk <[email protected]> | |||||
| 2005-04-16 | Linux-2.6.12-rc2 | Linus Torvalds | 1 | -0/+127 | |
| 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! | |||||