lockd: stop abusing file_lock_list

Currently lockd directly access the file_lock_list from fs/locks.c.
It does so to mark locks granted or reclaimable.  This is very
suboptimal, because a) lockd needs to poke into locks.c internals, and
b) it needs to iterate over all locks in the system for marking locks
granted or reclaimable.

This patch adds lists for granted and reclaimable locks to the nlm_host
structure instead, and adds locks to those.

nlmclnt_lock:
	now adds the lock to h_granted instead of setting the
	NFS_LCK_GRANTED, still O(1)

nlmclnt_mark_reclaim:
	goes away completely, replaced by a list_splice_init.
	Complexity reduced from O(locks in the system) to O(1)

reclaimer:
	iterates over h_reclaim now, complexity reduced from
	O(locks in the system) to O(locks per nlm_host)

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

3 files changed, 3 insertions, 9 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index d2cffee8fc11..5dc0fa288a4c 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -730,8 +730,6 @@ struct file_lock {
 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
 #endif
 
-extern struct list_head file_lock_list;
-
 #include <linux/fcntl.h>
 
 extern int fcntl_getlk(struct file *, struct flock __user *);
diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h
index 860a93f6ce6d..b0f63b6ab0d4 100644
--- a/include/linux/lockd/lockd.h
+++ b/include/linux/lockd/lockd.h
@@ -59,6 +59,8 @@ struct nlm_host {
         unsigned long           h_expires;      /* eligible for GC */
         struct list_head        h_lockowners;   /* Lockowners for the client */
         spinlock_t              h_lock;
+        struct list_head        h_granted;      /* Locks in GRANTED state */
+        struct list_head        h_reclaim;      /* Locks in RECLAIM state */
 };
 
 /*
diff --git a/include/linux/nfs_fs_i.h b/include/linux/nfs_fs_i.h
index e2c18dabff86..861730275ba0 100644
--- a/include/linux/nfs_fs_i.h
+++ b/include/linux/nfs_fs_i.h
@@ -12,8 +12,8 @@ struct nlm_lockowner;
  */
 struct nfs_lock_info {
         u32             state;
-        u32             flags;
         struct nlm_lockowner *owner;
+        struct list_head list;
 };
 
 struct nfs4_lock_state;
@@ -21,10 +21,4 @@ struct nfs4_lock_info {
         struct nfs4_lock_state *owner;
 };
 
-/*
- * Lock flag values
- */
-#define NFS_LCK_GRANTED         0x0001          /* lock has been granted */
-#define NFS_LCK_RECLAIM         0x0002          /* lock marked for reclaiming */
-
 #endif