No arch seems to use these values for anything, so defining them
globally should be ok. When they are specified, translate them into
their non-P variants, and set the FL_FILP_PRIVATE flag to indicate
that they should get the proper behavior on close.
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
fs/locks.c | 11 +++++++++++
include/linux/fs.h | 1 +
include/uapi/asm-generic/fcntl.h | 9 +++++++++
3 files changed, 21 insertions(+)
diff --git a/fs/locks.c b/fs/locks.c
index 389382c..086c3b4 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -348,6 +348,17 @@ static int posix_assign_type(struct file_lock *fl, long type)
{
int err;
+ switch(type) {
+ case F_RDLCKP:
+ type = F_RDLCK;
+ fl->fl_flags |= FL_FILP_PRIVATE;
+ break;
+ case F_WRLCKP:
+ type = F_WRLCK;
+ fl->fl_flags |= FL_FILP_PRIVATE;
+ break;
+ }
+
err = assign_type(fl, type);
if (err)
return err;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index b46bfa5..df502bf 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -889,6 +889,7 @@ 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_FILP_PRIVATE 1024 /* only release on close of filp on which it was set */
/*
* Special return value from posix_lock_file() and vfs_lock_file() for
diff --git a/include/uapi/asm-generic/fcntl.h b/include/uapi/asm-generic/fcntl.h
index 95e46c8..0a4be0d 100644
--- a/include/uapi/asm-generic/fcntl.h
+++ b/include/uapi/asm-generic/fcntl.h
@@ -151,6 +151,15 @@ struct f_owner_ex {
#define F_UNLCK 2
#endif
+/*
+ * fd "private" POSIX locks. Usually POSIX locks held by a process are
+ * released on *any* close. If they are acquired using these l_type
+ * values, then they are only released on close of the fd on which they
+ * were acquired, similar to how BSD locks work.
+ */
+#define F_RDLCKP 5
+#define F_WRLCKP 6
+
/* for old implementation of bsd flock () */
#ifndef F_EXLCK
#define F_EXLCK 4 /* or 3 */
--
1.8.3.1
--
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