locks: make /proc/locks show IS_FILE_PVT locks as type "FLPVT"

In a later patch, we'll be adding a new type of lock that's owned by
the struct file instead of the files_struct. Those sorts of locks
will be flagged with a new FL_FILE_PVT flag.

Report these types of locks as "FLPVT" in /proc/locks to distinguish
them from "classic" POSIX locks.

Acked-by: J. Bruce Fields <bfields@fieldses.org>
Signed-off-by: Jeff Layton <jlayton@redhat.com>

2 files changed, 10 insertions, 2 deletions

diff --git a/fs/locks.c b/fs/locks.c
index 4d4e790150e0..0e1f0df8de12 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -135,6 +135,7 @@
 #define IS_POSIX(fl)    (fl->fl_flags & FL_POSIX)
 #define IS_FLOCK(fl)    (fl->fl_flags & FL_FLOCK)
 #define IS_LEASE(fl)    (fl->fl_flags & (FL_LEASE|FL_DELEG))
+#define IS_FILE_PVT(fl) (fl->fl_flags & FL_FILE_PVT)
 
 static bool lease_breaking(struct file_lock *fl)
 {
@@ -2313,8 +2314,14 @@ static void lock_get_status(struct seq_file *f, struct file_lock *fl,
 
         seq_printf(f, "%lld:%s ", id, pfx);
         if (IS_POSIX(fl)) {
-                seq_printf(f, "%6s %s ",
-                             (fl->fl_flags & FL_ACCESS) ? "ACCESS" : "POSIX ",
+                if (fl->fl_flags & FL_ACCESS)
+                        seq_printf(f, "ACCESS");
+                else if (IS_FILE_PVT(fl))
+                        seq_printf(f, "FLPVT ");
+                else
+                        seq_printf(f, "POSIX ");
+
+                seq_printf(f, " %s ",
                              (inode == NULL) ? "*NOINODE*" :
                              mandatory_lock(inode) ? "MANDATORY" : "ADVISORY ");
         } else if (IS_FLOCK(fl)) {
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 7527d96913d3..5ddeb8de5e77 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -888,6 +888,7 @@ static inline int file_check_writeable(struct file *filp)
 #define FL_SLEEP        128     /* A blocking lock */
 #define FL_DOWNGRADE_PENDING    256 /* Lease is being downgraded */
 #define FL_UNLOCK_PENDING       512 /* Lease is being broken */
+#define FL_FILE_PVT     1024    /* lock is private to the file */
 
 /*
  * Special return value from posix_lock_file() and vfs_lock_file() for