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authorLinus Torvalds <torvalds@linux-foundation.org>2018-08-13 21:56:50 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-13 21:56:50 -0700
commit575b94386bd539a7d803aee9fd4a8d275844c40f (patch)
treeef5390206b64cf724a1485cfa3566ae20e4b73d2 /fs/locks.c
parent4591343e3560d51fa37a24cd262192a7b889a6a3 (diff)
parentda33a871ba178dbe81da7d755818d3c2088cae32 (diff)
downloadlinux-575b94386bd539a7d803aee9fd4a8d275844c40f.tar.bz2
Merge tag 'locks-v4.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux
Pull file locking updates from Jeff Layton: "Just a couple of patches from Konstantin to fix /proc/locks when the process that set the lock has exited, and a new tracepoint for the flock() codepath. Also threw in mailmap entries for my addresses and a comment cleanup" * tag 'locks-v4.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux: locks: remove misleading obsolete comment mailmap: remap some of my email addresses to kernel.org address locks: add tracepoint in flock codepath fs/lock: show locks taken by processes from another pidns fs/lock: skip lock owner pid translation in case we are in init_pid_ns
Diffstat (limited to 'fs/locks.c')
-rw-r--r--fs/locks.c20
1 files changed, 11 insertions, 9 deletions
diff --git a/fs/locks.c b/fs/locks.c
index db7b6917d9c5..bc047a7edc47 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -202,10 +202,6 @@ static DEFINE_HASHTABLE(blocked_hash, BLOCKED_HASH_BITS);
* we often hold the flc_lock as well. In certain cases, when reading the fields
* protected by this lock, we can skip acquiring it iff we already hold the
* flc_lock.
- *
- * In particular, adding an entry to the fl_block list requires that you hold
- * both the flc_lock and the blocked_lock_lock (acquired in that order).
- * Deleting an entry from the list however only requires the file_lock_lock.
*/
static DEFINE_SPINLOCK(blocked_lock_lock);
@@ -990,6 +986,7 @@ out:
if (new_fl)
locks_free_lock(new_fl);
locks_dispose_list(&dispose);
+ trace_flock_lock_inode(inode, request, error);
return error;
}
@@ -2072,6 +2069,13 @@ static pid_t locks_translate_pid(struct file_lock *fl, struct pid_namespace *ns)
return -1;
if (IS_REMOTELCK(fl))
return fl->fl_pid;
+ /*
+ * If the flock owner process is dead and its pid has been already
+ * freed, the translation below won't work, but we still want to show
+ * flock owner pid number in init pidns.
+ */
+ if (ns == &init_pid_ns)
+ return (pid_t)fl->fl_pid;
rcu_read_lock();
pid = find_pid_ns(fl->fl_pid, &init_pid_ns);
@@ -2626,12 +2630,10 @@ static void lock_get_status(struct seq_file *f, struct file_lock *fl,
fl_pid = locks_translate_pid(fl, proc_pidns);
/*
- * If there isn't a fl_pid don't display who is waiting on
- * the lock if we are called from locks_show, or if we are
- * called from __show_fd_info - skip lock entirely
+ * If lock owner is dead (and pid is freed) or not visible in current
+ * pidns, zero is shown as a pid value. Check lock info from
+ * init_pid_ns to get saved lock pid value.
*/
- if (fl_pid == 0)
- return;
if (fl->fl_file != NULL)
inode = locks_inode(fl->fl_file);