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>
Change-Id: Id0b6d9c7a947b512e5683ad3b6188d73582c2de9
Signed-off-by: Kevin F. Haggerty <haggertk@lineageos.org>

diff --git a/fs/locks.c b/fs/locks.c
index 74c9f1db6fca89bdcd05e912d52cd1b9783184ab..c4a9c7a17fa4e89db9ccd0f92469a08fa278a599 100644 (file)
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -132,6 +132,7 @@
 #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)
+#define IS_FILE_PVT(fl)        (fl->fl_flags & FL_FILE_PVT)
 
 static bool lease_breaking(struct file_lock *fl)
 {
@@ -2164,8 +2165,14 @@ 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 66fb6fdd9f107a9e5e0551c75e79f17985fd9b3c..03206754da7fbf7764ab3e3f245481c598aeb299 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -943,6 +943,7 @@ 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