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authorPavel Emelyanov <xemul@openvz.org>2007-10-19 02:40:03 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-19 14:53:38 -0400
commit60347f6716aa49831ac311e04d77ccdc50dc024a (patch)
tree82e666fef22f43550da42ad368a61a5e9a59ef96 /include
parent8bf9725c29f2589237dd696d06a204230add0ba3 (diff)
pid namespaces: prepare proc_flust_task() to flush entries from multiple proc trees
The first part is trivial - we just make the proc_flush_task() to operate on arbitrary vfsmount with arbitrary ids and pass the pid and global proc_mnt to it. The other change is more tricky: I moved the proc_flush_task() call in release_task() higher to address the following problem. When flushing task from many proc trees we need to know the set of ids (not just one pid) to find the dentries' names to flush. Thus we need to pass the task's pid to proc_flush_task() as struct pid is the only object that can provide all the pid numbers. But after __exit_signal() task has detached all his pids and this information is lost. This creates a tiny gap for proc_pid_lookup() to bring some dentries back to tree and keep them in hash (since pids are still alive before __exit_signal()) till the next shrink, but since proc_flush_task() does not provide a 100% guarantee that the dentries will be flushed, this is OK to do so. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com> Cc: Paul Menage <menage@google.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/proc_fs.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h
index 20741f668f7b..dbd601c7244c 100644
--- a/include/linux/proc_fs.h
+++ b/include/linux/proc_fs.h
@@ -207,7 +207,9 @@ extern void proc_net_remove(struct net *net, const char *name);
207#define proc_net_create(net, name, mode, info) ({ (void)(mode), NULL; }) 207#define proc_net_create(net, name, mode, info) ({ (void)(mode), NULL; })
208static inline void proc_net_remove(struct net *net, const char *name) {} 208static inline void proc_net_remove(struct net *net, const char *name) {}
209 209
210static inline void proc_flush_task(struct task_struct *task) { } 210static inline void proc_flush_task(struct task_struct *task)
211{
212}
211 213
212static inline struct proc_dir_entry *create_proc_entry(const char *name, 214static inline struct proc_dir_entry *create_proc_entry(const char *name,
213 mode_t mode, struct proc_dir_entry *parent) { return NULL; } 215 mode_t mode, struct proc_dir_entry *parent) { return NULL; }