[XFS] Cleanup the use of zones/slabs, more consistent and allows flags to

be passed.

SGI-PV: 949073
SGI-Modid: xfs-linux-melb:xfs-kern:25122a
Signed-off-by: NNathan Scott <nathans@sgi.com>

fs/xfs/linux-2.6/kmem.h

@@ -23,17 +23,8 @@
 #include <linux/mm.h>
 
 /*
- * memory management routines
+ * Process flags handling
  */
-#define KM_SLEEP	0x0001u
-#define KM_NOSLEEP	0x0002u
-#define KM_NOFS		0x0004u
-#define KM_MAYFAIL	0x0008u
-
-#define	kmem_zone	kmem_cache
-#define kmem_zone_t	struct kmem_cache
-
-typedef unsigned long xfs_pflags_t;
 
 #define PFLAGS_TEST_NOIO()              (current->flags & PF_NOIO)
 #define PFLAGS_TEST_FSTRANS()           (current->flags & PF_FSTRANS)
@@ -67,74 +58,102 @@ typedef unsigned long xfs_pflags_t;
 	*(NSTATEP) = *(OSTATEP);	\
 } while (0)
 
-static __inline gfp_t kmem_flags_convert(unsigned int __nocast flags)
+/*
+ * General memory allocation interfaces
+ */
+
+#define KM_SLEEP	0x0001u
+#define KM_NOSLEEP	0x0002u
+#define KM_NOFS		0x0004u
+#define KM_MAYFAIL	0x0008u
+
+/*
+ * We use a special process flag to avoid recursive callbacks into
+ * the filesystem during transactions.  We will also issue our own
+ * warnings, so we explicitly skip any generic ones (silly of us).
+ */
+static inline gfp_t
+kmem_flags_convert(unsigned int __nocast flags)
 {
-	gfp_t	lflags = __GFP_NOWARN;	/* we'll report problems, if need be */
+	gfp_t	lflags;
 
-#ifdef DEBUG
-	if (unlikely(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL))) {
-		printk(KERN_WARNING
-		    "XFS: memory allocation with wrong flags (%x)\n", flags);
-		BUG();
-	}
-#endif
+	BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL));
 
 	if (flags & KM_NOSLEEP) {
-		lflags |= GFP_ATOMIC;
+		lflags = GFP_ATOMIC | __GFP_NOWARN;
 	} else {
-		lflags |= GFP_KERNEL;
-
-		/* avoid recusive callbacks to filesystem during transactions */
+		lflags = GFP_KERNEL | __GFP_NOWARN;
 		if (PFLAGS_TEST_FSTRANS() || (flags & KM_NOFS))
 			lflags &= ~__GFP_FS;
 	}
-
 	return lflags;
 }
 
-static __inline kmem_zone_t *
+extern void *kmem_alloc(size_t, unsigned int __nocast);
+extern void *kmem_realloc(void *, size_t, size_t, unsigned int __nocast);
+extern void *kmem_zalloc(size_t, unsigned int __nocast);
+extern void  kmem_free(void *, size_t);
+
+/*
+ * Zone interfaces
+ */
+
+#define KM_ZONE_HWALIGN	SLAB_HWCACHE_ALIGN
+#define KM_ZONE_RECLAIM	SLAB_RECLAIM_ACCOUNT
+#define KM_ZONE_SPREAD	0
+
+#define kmem_zone	kmem_cache
+#define kmem_zone_t	struct kmem_cache
+
+static inline kmem_zone_t *
 kmem_zone_init(int size, char *zone_name)
 {
 	return kmem_cache_create(zone_name, size, 0, 0, NULL, NULL);
 }
 
-static __inline void
+static inline kmem_zone_t *
+kmem_zone_init_flags(int size, char *zone_name, unsigned long flags,
+		     void (*construct)(void *, kmem_zone_t *, unsigned long))
+{
+	return kmem_cache_create(zone_name, size, 0, flags, construct, NULL);
+}
+
+static inline void
 kmem_zone_free(kmem_zone_t *zone, void *ptr)
 {
 	kmem_cache_free(zone, ptr);
 }
 
-static __inline void
+static inline void
 kmem_zone_destroy(kmem_zone_t *zone)
 {
 	if (zone && kmem_cache_destroy(zone))
 		BUG();
 }
 
-extern void *kmem_zone_zalloc(kmem_zone_t *, unsigned int __nocast);
 extern void *kmem_zone_alloc(kmem_zone_t *, unsigned int __nocast);
+extern void *kmem_zone_zalloc(kmem_zone_t *, unsigned int __nocast);
 
-extern void *kmem_alloc(size_t, unsigned int __nocast);
-extern void *kmem_realloc(void *, size_t, size_t, unsigned int __nocast);
-extern void *kmem_zalloc(size_t, unsigned int __nocast);
-extern void  kmem_free(void *, size_t);
+/*
+ * Low memory cache shrinkers
+ */
 
 typedef struct shrinker *kmem_shaker_t;
 typedef int (*kmem_shake_func_t)(int, gfp_t);
 
-static __inline kmem_shaker_t
+static inline kmem_shaker_t
 kmem_shake_register(kmem_shake_func_t sfunc)
 {
 	return set_shrinker(DEFAULT_SEEKS, sfunc);
 }
 
-static __inline void
+static inline void
 kmem_shake_deregister(kmem_shaker_t shrinker)
 {
 	remove_shrinker(shrinker);
 }
 
-static __inline int
+static inline int
 kmem_shake_allow(gfp_t gfp_mask)
 {
 	return (gfp_mask & __GFP_WAIT);

fs/xfs/linux-2.6/xfs_buf.c

@@ -1805,13 +1805,12 @@ xfs_flush_buftarg(
 int __init
 xfs_buf_init(void)
 {
-	int		error = -ENOMEM;
-
 #ifdef XFS_BUF_TRACE
 	xfs_buf_trace_buf = ktrace_alloc(XFS_BUF_TRACE_SIZE, KM_SLEEP);
 #endif
 
-	xfs_buf_zone = kmem_zone_init(sizeof(xfs_buf_t), "xfs_buf");
+	xfs_buf_zone = kmem_zone_init_flags(sizeof(xfs_buf_t), "xfs_buf",
+						KM_ZONE_HWALIGN, NULL);
 	if (!xfs_buf_zone)
 		goto out_free_trace_buf;
 
@@ -1839,7 +1838,7 @@ xfs_buf_init(void)
 #ifdef XFS_BUF_TRACE
 	ktrace_free(xfs_buf_trace_buf);
 #endif
-	return error;
+	return -ENOMEM;
 }
 
 void

fs/xfs/linux-2.6/xfs_super.c

@@ -337,8 +337,8 @@ linvfs_alloc_inode(
 {
 	vnode_t			*vp;
 
-	vp = kmem_cache_alloc(xfs_vnode_zone, kmem_flags_convert(KM_SLEEP));
-	if (!vp)
+	vp = kmem_zone_alloc(xfs_vnode_zone, KM_SLEEP);
+	if (unlikely(!vp))
 		return NULL;
 	return LINVFS_GET_IP(vp);
 }
@@ -352,23 +352,21 @@ linvfs_destroy_inode(
 
 STATIC void
 linvfs_inode_init_once(
-	void			*data,
-	kmem_cache_t		*cachep,
+	void			*vnode,
+	kmem_zone_t		*zonep,
 	unsigned long		flags)
 {
-	vnode_t			*vp = (vnode_t *)data;
-
 	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
 		      SLAB_CTOR_CONSTRUCTOR)
-		inode_init_once(LINVFS_GET_IP(vp));
+		inode_init_once(LINVFS_GET_IP((vnode_t *)vnode));
 }
 
 STATIC int
-linvfs_init_zones(void)
+xfs_init_zones(void)
 {
-	xfs_vnode_zone = kmem_cache_create("xfs_vnode",
-				sizeof(vnode_t), 0, SLAB_RECLAIM_ACCOUNT,
-				linvfs_inode_init_once, NULL);
+	xfs_vnode_zone = kmem_zone_init_flags(sizeof(vnode_t), "xfs_vnode_t",
+					KM_ZONE_HWALIGN | KM_ZONE_RECLAIM,
+					linvfs_inode_init_once);
 	if (!xfs_vnode_zone)
 		goto out;
 
@@ -381,10 +379,8 @@ linvfs_init_zones(void)
 					xfs_ioend_zone);
 	if (!xfs_ioend_pool)
 		goto out_free_ioend_zone;
-
 	return 0;
 
-
  out_free_ioend_zone:
 	kmem_zone_destroy(xfs_ioend_zone);
  out_destroy_vnode_zone:
@@ -394,7 +390,7 @@ linvfs_init_zones(void)
 }
 
 STATIC void
-linvfs_destroy_zones(void)
+xfs_destroy_zones(void)
 {
 	mempool_destroy(xfs_ioend_pool);
 	kmem_zone_destroy(xfs_vnode_zone);
@@ -963,7 +959,7 @@ init_xfs_fs( void )
 
 	ktrace_init(64);
 
-	error = linvfs_init_zones();
+	error = xfs_init_zones();
 	if (error < 0)
 		goto undo_zones;
 
@@ -986,7 +982,7 @@ init_xfs_fs( void )
 	xfs_buf_terminate();
 
 undo_buffers:
-	linvfs_destroy_zones();
+	xfs_destroy_zones();
 
 undo_zones:
 	return error;
@@ -1000,7 +996,7 @@ exit_xfs_fs( void )
 	unregister_filesystem(&xfs_fs_type);
 	xfs_cleanup();
 	xfs_buf_terminate();
-	linvfs_destroy_zones();
+	xfs_destroy_zones();
 	ktrace_uninit();
 }
 

fs/xfs/xfs_trans.h

@@ -380,7 +380,7 @@ typedef struct xfs_trans {
 	xfs_trans_header_t	t_header;	/* header for in-log trans */
 	unsigned int		t_busy_free;	/* busy descs free */
 	xfs_log_busy_chunk_t	t_busy;		/* busy/async free blocks */
-        xfs_pflags_t            t_pflags;       /* saved pflags state */
+	unsigned long		t_pflags;	/* saved process flags state */
 } xfs_trans_t;
 
 #endif	/* __KERNEL__ */

fs/xfs/xfs_vfsops.c

@@ -77,11 +77,12 @@ xfs_init(void)
 						 "xfs_bmap_free_item");
 	xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
 					    "xfs_btree_cur");
-	xfs_inode_zone = kmem_zone_init(sizeof(xfs_inode_t), "xfs_inode");
 	xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
 	xfs_da_state_zone =
 		kmem_zone_init(sizeof(xfs_da_state_t), "xfs_da_state");
 	xfs_dabuf_zone = kmem_zone_init(sizeof(xfs_dabuf_t), "xfs_dabuf");
+	xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
+	xfs_acl_zone_init(xfs_acl_zone, "xfs_acl");
 
 	/*
 	 * The size of the zone allocated buf log item is the maximum
@@ -93,17 +94,30 @@ xfs_init(void)
 				(((XFS_MAX_BLOCKSIZE / XFS_BLI_CHUNK) /
 				  NBWORD) * sizeof(int))),
 			       "xfs_buf_item");
-	xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
-				       ((XFS_EFD_MAX_FAST_EXTENTS - 1) * sizeof(xfs_extent_t))),
+	xfs_efd_zone =
+		kmem_zone_init((sizeof(xfs_efd_log_item_t) +
+			       ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
+				 sizeof(xfs_extent_t))),
 				      "xfs_efd_item");
-	xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
-				       ((XFS_EFI_MAX_FAST_EXTENTS - 1) * sizeof(xfs_extent_t))),
+	xfs_efi_zone =
+		kmem_zone_init((sizeof(xfs_efi_log_item_t) +
+			       ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
+				 sizeof(xfs_extent_t))),
 				      "xfs_efi_item");
-	xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
-	xfs_ili_zone = kmem_zone_init(sizeof(xfs_inode_log_item_t), "xfs_ili");
-	xfs_chashlist_zone = kmem_zone_init(sizeof(xfs_chashlist_t),
-					    "xfs_chashlist");
-	xfs_acl_zone_init(xfs_acl_zone, "xfs_acl");
+
+	/*
+	 * These zones warrant special memory allocator hints
+	 */
+	xfs_inode_zone =
+		kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
+					KM_ZONE_HWALIGN | KM_ZONE_RECLAIM |
+					KM_ZONE_SPREAD, NULL);
+	xfs_ili_zone =
+		kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
+					KM_ZONE_SPREAD, NULL);
+	xfs_chashlist_zone =
+		kmem_zone_init_flags(sizeof(xfs_chashlist_t), "xfs_chashlist",
+					KM_ZONE_SPREAD, NULL);
 
 	/*
 	 * Allocate global trace buffers.