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File locking related changes for v4.9 

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Merge tag 'locks-v4.9-1' of git://git.samba.org/jlayton/linux

Pull file locking updates from Jeff Layton:
 "Only a single patch from Nikolay this cycle, with a small change to
  better handle /proc/locks in a containerized host"

* tag 'locks-v4.9-1' of git://git.samba.org/jlayton/linux:
  locks: Filter /proc/locks output on proc pid ns
This commit is contained in:
Linus Torvalds 2016-10-04 13:36:19 -07:00
parent ce866e2d18 d67fd44f69
commit c35bcfd8e4
1 changed files with 18 additions and 3 deletions
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21
fs/locks.c
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@ -2603,9 +2603,20 @@ static void lock_get_status(struct seq_file *f, struct file_lock *fl,
struct inode *inode = NULL;
unsigned int fl_pid;
if (fl->fl_nspid)
fl_pid = pid_vnr(fl->fl_nspid);
else
if (fl->fl_nspid) {
struct pid_namespace *proc_pidns = file_inode(f->file)->i_sb->s_fs_info;
/* Don't let fl_pid change based on who is reading the file */
fl_pid = pid_nr_ns(fl->fl_nspid, 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 (fl_pid == 0)
return;
} else
fl_pid = fl->fl_pid;
if (fl->fl_file != NULL)
@ -2677,9 +2688,13 @@ static int locks_show(struct seq_file *f, void *v)
{
struct locks_iterator *iter = f->private;
struct file_lock *fl, *bfl;
struct pid_namespace *proc_pidns = file_inode(f->file)->i_sb->s_fs_info;
fl = hlist_entry(v, struct file_lock, fl_link);
if (fl->fl_nspid && !pid_nr_ns(fl->fl_nspid, proc_pidns))
return 0;
lock_get_status(f, fl, iter->li_pos, "");
list_for_each_entry(bfl, &fl->fl_block, fl_block)