fs: add FL_LAYOUT lease type

This (ab-)uses the file locking code to allow filesystems to recall
outstanding pNFS layouts on a file.  This new lease type is similar but
not quite the same as FL_DELEG.  A FL_LAYOUT lease can always be granted,
an a per-filesystem lock (XFS iolock for the initial implementation)
ensures not FL_LAYOUT leases granted when we would need to recall them.

Also included are changes that allow multiple outstanding read
leases of different types on the same file as long as they have a
differnt owner.  This wasn't a problem until now as nfsd never set
FL_LEASE leases, and no one else used FL_DELEG leases, but given that
nfsd will also issues FL_LAYOUT leases we will have to handle it now.

Signed-off-by: Christoph Hellwig <hch@lst.de>

1 files changed, 16 insertions, 0 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index ddd2fa7cefd3..84740145f835 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -875,6 +875,7 @@ static inline struct file *get_file(struct file *f)
 #define FL_DOWNGRADE_PENDING    256 /* Lease is being downgraded */
 #define FL_UNLOCK_PENDING       512 /* Lease is being broken */
 #define FL_OFDLCK       1024    /* lock is "owned" by struct file */
+#define FL_LAYOUT       2048    /* outstanding pNFS layout */
 
 /*
  * Special return value from posix_lock_file() and vfs_lock_file() for
@@ -2037,6 +2038,16 @@ static inline int break_deleg_wait(struct inode **delegated_inode)
         return ret;
 }
 
+static inline int break_layout(struct inode *inode, bool wait)
+{
+        smp_mb();
+        if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease))
+                return __break_lease(inode,
+                                wait ? O_WRONLY : O_WRONLY | O_NONBLOCK,
+                                FL_LAYOUT);
+        return 0;
+}
+
 #else /* !CONFIG_FILE_LOCKING */
 static inline int locks_mandatory_locked(struct file *file)
 {
@@ -2092,6 +2103,11 @@ static inline int break_deleg_wait(struct inode **delegated_inode)
         return 0;
 }
 
+static inline int break_layout(struct inode *inode, bool wait)
+{
+        return 0;
+}
+
 #endif /* CONFIG_FILE_LOCKING */
 
 /* fs/open.c */