aboutsummaryrefslogtreecommitdiffstats
path: root/fs/proc/base.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/proc/base.c')
-rw-r--r--fs/proc/base.c46
1 files changed, 22 insertions, 24 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 39a3d7c969c5..aeaf0d0f2f51 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2255,27 +2255,6 @@ static const struct inode_operations proc_tgid_base_inode_operations = {
2255 .setattr = proc_setattr, 2255 .setattr = proc_setattr,
2256}; 2256};
2257 2257
2258/**
2259 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
2260 *
2261 * @task: task that should be flushed.
2262 *
2263 * Looks in the dcache for
2264 * /proc/@pid
2265 * /proc/@tgid/task/@pid
2266 * if either directory is present flushes it and all of it'ts children
2267 * from the dcache.
2268 *
2269 * It is safe and reasonable to cache /proc entries for a task until
2270 * that task exits. After that they just clog up the dcache with
2271 * useless entries, possibly causing useful dcache entries to be
2272 * flushed instead. This routine is proved to flush those useless
2273 * dcache entries at process exit time.
2274 *
2275 * NOTE: This routine is just an optimization so it does not guarantee
2276 * that no dcache entries will exist at process exit time it
2277 * just makes it very unlikely that any will persist.
2278 */
2279static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid) 2258static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid)
2280{ 2259{
2281 struct dentry *dentry, *leader, *dir; 2260 struct dentry *dentry, *leader, *dir;
@@ -2322,10 +2301,29 @@ out:
2322 return; 2301 return;
2323} 2302}
2324 2303
2325/* 2304/**
2326 * when flushing dentries from proc one need to flush them from global 2305 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
2306 * @task: task that should be flushed.
2307 *
2308 * When flushing dentries from proc, one needs to flush them from global
2327 * proc (proc_mnt) and from all the namespaces' procs this task was seen 2309 * proc (proc_mnt) and from all the namespaces' procs this task was seen
2328 * in. this call is supposed to make all this job. 2310 * in. This call is supposed to do all of this job.
2311 *
2312 * Looks in the dcache for
2313 * /proc/@pid
2314 * /proc/@tgid/task/@pid
2315 * if either directory is present flushes it and all of it'ts children
2316 * from the dcache.
2317 *
2318 * It is safe and reasonable to cache /proc entries for a task until
2319 * that task exits. After that they just clog up the dcache with
2320 * useless entries, possibly causing useful dcache entries to be
2321 * flushed instead. This routine is proved to flush those useless
2322 * dcache entries at process exit time.
2323 *
2324 * NOTE: This routine is just an optimization so it does not guarantee
2325 * that no dcache entries will exist at process exit time it
2326 * just makes it very unlikely that any will persist.
2329 */ 2327 */
2330 2328
2331void proc_flush_task(struct task_struct *task) 2329void proc_flush_task(struct task_struct *task)