Merge toomuch.toronto.redhat.com:/md0/linux-2.5

into toomuch.toronto.redhat.com:/md0/net-aio/bk/aio-2.5

6 files changed, 262 insertions, 106 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index ec0f6edac31b..f773053fdbc5 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -624,8 +624,6 @@ extern void __kill_fasync(struct fasync_struct *, int, int);
 
 #include <linux/ext3_fs_sb.h>
 #include <linux/hpfs_fs_sb.h>
-#include <linux/ufs_fs_sb.h>
-#include <linux/romfs_fs_sb.h>
 
 extern struct list_head super_blocks;
 extern spinlock_t sb_lock;
@@ -670,8 +668,6 @@ struct super_block {
 	union {
 		struct ext3_sb_info	ext3_sb;
 		struct hpfs_sb_info	hpfs_sb;
-		struct ufs_sb_info	ufs_sb;
-		struct romfs_sb_info	romfs_sb;
 		void			*generic_sbp;
 	} u;
 	/*
diff --git a/include/linux/preempt.h b/include/linux/preempt.h
index 3864d46eadba..b4ff1a7c881c 100644
--- a/include/linux/preempt.h
+++ b/include/linux/preempt.h
@@ -1,9 +1,14 @@
 #ifndef __LINUX_PREEMPT_H
 #define __LINUX_PREEMPT_H
 
+/*
+ * include/linux/preempt.h - macros for accessing and manipulating
+ * preempt_count (used for kernel preemption, interrupt count, etc.)
+ */
+
 #include <linux/config.h>
 
-#define preempt_count() (current_thread_info()->preempt_count)
+#define preempt_count()	(current_thread_info()->preempt_count)
 
 #define inc_preempt_count() \
 do { \
@@ -31,17 +36,16 @@ do { \
 	barrier(); \
 } while (0)
 
-#define preempt_enable() \
+#define preempt_check_resched() \
 do { \
-	preempt_enable_no_resched(); \
 	if (unlikely(test_thread_flag(TIF_NEED_RESCHED))) \
 		preempt_schedule(); \
 } while (0)
 
-#define preempt_check_resched() \
+#define preempt_enable() \
 do { \
-	if (unlikely(test_thread_flag(TIF_NEED_RESCHED))) \
-		preempt_schedule(); \
+	preempt_enable_no_resched(); \
+	preempt_check_resched(); \
 } while (0)
 
 #define inc_preempt_count_non_preempt()	do { } while (0)
@@ -50,7 +54,7 @@ do { \
 #else
 
 #define preempt_disable()		do { } while (0)
-#define preempt_enable_no_resched()	do {} while(0)
+#define preempt_enable_no_resched()	do { } while (0)
 #define preempt_enable()		do { } while (0)
 #define preempt_check_resched()		do { } while (0)
 
diff --git a/include/linux/romfs_fs_sb.h b/include/linux/romfs_fs_sb.h
deleted file mode 100644
index 02da2280a6df..000000000000
--- a/include/linux/romfs_fs_sb.h
+++ /dev/null
@@ -1,10 +0,0 @@
-#ifndef __ROMFS_FS_SB
-#define __ROMFS_FS_SB
-
-/* romfs superblock in-core data */
-
-struct romfs_sb_info {
-	unsigned long s_maxsize;
-};
-
-#endif
diff --git a/include/linux/smp_lock.h b/include/linux/smp_lock.h
index cfb23f363e61..40f5358fc856 100644
--- a/include/linux/smp_lock.h
+++ b/include/linux/smp_lock.h
@@ -13,7 +13,59 @@
 
 #else
 
-#include <asm/smplock.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/sched.h>
+#include <asm/current.h>
+
+extern spinlock_t kernel_flag;
+
+#define kernel_locked()		(current->lock_depth >= 0)
+
+#define get_kernel_lock()	spin_lock(&kernel_flag)
+#define put_kernel_lock()	spin_unlock(&kernel_flag)
+
+/*
+ * Release global kernel lock and global interrupt lock
+ */
+#define release_kernel_lock(task)		\
+do {						\
+	if (unlikely(task->lock_depth >= 0))	\
+		put_kernel_lock();		\
+} while (0)
+
+/*
+ * Re-acquire the kernel lock
+ */
+#define reacquire_kernel_lock(task)		\
+do {						\
+	if (unlikely(task->lock_depth >= 0))	\
+		get_kernel_lock();		\
+} while (0)
+
+
+/*
+ * Getting the big kernel lock.
+ *
+ * This cannot happen asynchronously,
+ * so we only need to worry about other
+ * CPU's.
+ */
+static __inline__ void lock_kernel(void)
+{
+	int depth = current->lock_depth+1;
+	if (!depth)
+		get_kernel_lock();
+	current->lock_depth = depth;
+}
+
+static __inline__ void unlock_kernel(void)
+{
+	if (current->lock_depth < 0)
+		BUG();
+	if (--current->lock_depth < 0)
+		put_kernel_lock();
+}
 
 #endif /* CONFIG_SMP */
 
diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index 749d3054b2dc..6de41e91171f 100644
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -1,52 +1,23 @@
 #ifndef __LINUX_SPINLOCK_H
 #define __LINUX_SPINLOCK_H
 
+/*
+ * include/linux/spinlock.h - generic locking declarations
+ */
+
 #include <linux/config.h>
 #include <linux/preempt.h>
 #include <linux/linkage.h>
 #include <linux/compiler.h>
 #include <linux/thread_info.h>
 #include <linux/kernel.h>
+#include <linux/stringify.h>
 
 #include <asm/system.h>
 
 /*
- * These are the generic versions of the spinlocks and read-write
- * locks..
+ * Must define these before including other files, inline functions need them
  */
-#define spin_lock_irqsave(lock, flags)		do { local_irq_save(flags);       spin_lock(lock); } while (0)
-#define spin_lock_irq(lock)			do { local_irq_disable();         spin_lock(lock); } while (0)
-#define spin_lock_bh(lock)			do { local_bh_disable();          spin_lock(lock); } while (0)
-
-#define read_lock_irqsave(lock, flags)		do { local_irq_save(flags);       read_lock(lock); } while (0)
-#define read_lock_irq(lock)			do { local_irq_disable();         read_lock(lock); } while (0)
-#define read_lock_bh(lock)			do { local_bh_disable();          read_lock(lock); } while (0)
-
-#define write_lock_irqsave(lock, flags)		do { local_irq_save(flags);      write_lock(lock); } while (0)
-#define write_lock_irq(lock)			do { local_irq_disable();        write_lock(lock); } while (0)
-#define write_lock_bh(lock)			do { local_bh_disable();         write_lock(lock); } while (0)
-
-#define spin_unlock_irqrestore(lock, flags)	do { _raw_spin_unlock(lock);  local_irq_restore(flags); preempt_enable(); } while (0)
-#define _raw_spin_unlock_irqrestore(lock, flags) do { _raw_spin_unlock(lock);  local_irq_restore(flags); } while (0)
-#define spin_unlock_irq(lock)			do { _raw_spin_unlock(lock);  local_irq_enable(); preempt_enable();       } while (0)
-#define spin_unlock_bh(lock)			do { spin_unlock(lock); local_bh_enable(); } while (0)
-
-#define read_unlock_irqrestore(lock, flags)	do { _raw_read_unlock(lock);  local_irq_restore(flags); preempt_enable(); } while (0)
-#define read_unlock_irq(lock)			do { _raw_read_unlock(lock);  local_irq_enable(); preempt_enable(); } while (0)
-#define read_unlock_bh(lock)			do { read_unlock(lock);  local_bh_enable();        } while (0)
-
-#define write_unlock_irqrestore(lock, flags)	do { _raw_write_unlock(lock); local_irq_restore(flags); preempt_enable(); } while (0)
-#define write_unlock_irq(lock)			do { _raw_write_unlock(lock); local_irq_enable(); preempt_enable();       } while (0)
-#define write_unlock_bh(lock)			do { write_unlock(lock); local_bh_enable();        } while (0)
-#define spin_trylock_bh(lock)			({ int __r; local_bh_disable();\
-						__r = spin_trylock(lock);      \
-						if (!__r) local_bh_enable();   \
-						__r; })
-
-/* Must define these before including other files, inline functions need them */
-
-#include <linux/stringify.h>
-
 #define LOCK_SECTION_NAME			\
 	".text.lock." __stringify(KBUILD_BASENAME)
 
@@ -60,11 +31,17 @@
 #define LOCK_SECTION_END			\
 	".previous\n\t"
 
+/*
+ * If CONFIG_SMP is set, pull in the _raw_* definitions
+ */
 #ifdef CONFIG_SMP
 #include <asm/spinlock.h>
 
-#elif !defined(spin_lock_init) /* !SMP and spin_lock_init not previously
-                                  defined (e.g. by including asm/spinlock.h */
+/*
+ * !CONFIG_SMP and spin_lock_init not previously defined
+ * (e.g. by including include/asm/spinlock.h)
+ */
+#elif !defined(spin_lock_init)
 
 #ifndef CONFIG_PREEMPT
 # define atomic_dec_and_lock(atomic,lock) atomic_dec_and_test(atomic)
@@ -72,55 +49,42 @@
 #endif
 
 /*
- * Your basic spinlocks, allowing only a single CPU anywhere
- *
- * Most gcc versions have a nasty bug with empty initializers.
+ * gcc versions before ~2.95 have a nasty bug with empty initializers.
  */
 #if (__GNUC__ > 2)
   typedef struct { } spinlock_t;
-# define SPIN_LOCK_UNLOCKED (spinlock_t) { }
+  typedef struct { } rwlock_t;
+  #define SPIN_LOCK_UNLOCKED (spinlock_t) { }
+  #define RW_LOCK_UNLOCKED (rwlock_t) { }
 #else
   typedef struct { int gcc_is_buggy; } spinlock_t;
-# define SPIN_LOCK_UNLOCKED (spinlock_t) { 0 }
+  typedef struct { int gcc_is_buggy; } rwlock_t;
+  #define SPIN_LOCK_UNLOCKED (spinlock_t) { 0 }
+  #define RW_LOCK_UNLOCKED (rwlock_t) { 0 }
 #endif
 
+/*
+ * If CONFIG_SMP is unset, declare the _raw_* definitions as nops
+ */
 #define spin_lock_init(lock)	do { (void)(lock); } while(0)
-#define _raw_spin_lock(lock)	(void)(lock) /* Not "unused variable". */
+#define _raw_spin_lock(lock)	(void)(lock)
 #define spin_is_locked(lock)	((void)(lock), 0)
 #define _raw_spin_trylock(lock)	((void)(lock), 1)
 #define spin_unlock_wait(lock)	do { (void)(lock); } while(0)
 #define _raw_spin_unlock(lock)	do { (void)(lock); } while(0)
-
-/*
- * Read-write spinlocks, allowing multiple readers
- * but only one writer.
- *
- * NOTE! it is quite common to have readers in interrupts
- * but no interrupt writers. For those circumstances we
- * can "mix" irq-safe locks - any writer needs to get a
- * irq-safe write-lock, but readers can get non-irqsafe
- * read-locks.
- *
- * Most gcc versions have a nasty bug with empty initializers.
- */
-#if (__GNUC__ > 2)
-  typedef struct { } rwlock_t;
-  #define RW_LOCK_UNLOCKED (rwlock_t) { }
-#else
-  typedef struct { int gcc_is_buggy; } rwlock_t;
-  #define RW_LOCK_UNLOCKED (rwlock_t) { 0 }
-#endif
-
 #define rwlock_init(lock)	do { } while(0)
-#define _raw_read_lock(lock)	(void)(lock) /* Not "unused variable". */
+#define _raw_read_lock(lock)	(void)(lock)
 #define _raw_read_unlock(lock)	do { } while(0)
-#define _raw_write_lock(lock)	(void)(lock) /* Not "unused variable". */
+#define _raw_write_lock(lock)	(void)(lock)
 #define _raw_write_unlock(lock)	do { } while(0)
 
 #endif /* !SMP */
 
-#ifdef CONFIG_PREEMPT
-
+/*
+ * Define the various spin_lock and rw_lock methods.  Note we define these
+ * regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various
+ * methods are defined as nops in the case they are not required.
+ */
 #define spin_lock(lock)	\
 do { \
 	preempt_disable(); \
@@ -129,31 +93,175 @@ do { \
 
 #define spin_trylock(lock)	({preempt_disable(); _raw_spin_trylock(lock) ? \
 				1 : ({preempt_enable(); 0;});})
+
 #define spin_unlock(lock) \
 do { \
 	_raw_spin_unlock(lock); \
 	preempt_enable(); \
 } while (0)
 
-#define read_lock(lock)		({preempt_disable(); _raw_read_lock(lock);})
-#define read_unlock(lock)	({_raw_read_unlock(lock); preempt_enable();})
-#define write_lock(lock)	({preempt_disable(); _raw_write_lock(lock);})
-#define write_unlock(lock)	({_raw_write_unlock(lock); preempt_enable();})
+#define read_lock(lock)	\
+do { \
+	preempt_disable(); \
+	_raw_read_lock(lock); \
+} while(0)
+
+#define read_unlock(lock) \
+do { \
+	_raw_read_unlock(lock); \
+	preempt_enable(); \
+} while(0)
+
+#define write_lock(lock) \
+do { \
+	preempt_disable(); \
+	_raw_write_lock(lock); \
+} while(0)
+
+#define write_unlock(lock) \
+do { \
+	_raw_write_unlock(lock); \
+	preempt_enable(); \
+} while(0)
+
 #define write_trylock(lock)	({preempt_disable();_raw_write_trylock(lock) ? \
 				1 : ({preempt_enable(); 0;});})
 
-#else
+#define spin_lock_irqsave(lock, flags) \
+do { \
+	local_irq_save(flags); \
+	preempt_disable(); \
+	_raw_spin_lock(lock); \
+} while (0)
 
-#define spin_lock(lock)			_raw_spin_lock(lock)
-#define spin_trylock(lock)		_raw_spin_trylock(lock)
-#define spin_unlock(lock)		_raw_spin_unlock(lock)
+#define spin_lock_irq(lock) \
+do { \
+	local_irq_disable(); \
+	preempt_disable(); \
+	_raw_spin_lock(lock); \
+} while (0)
 
-#define read_lock(lock)			_raw_read_lock(lock)
-#define read_unlock(lock)		_raw_read_unlock(lock)
-#define write_lock(lock)		_raw_write_lock(lock)
-#define write_unlock(lock)		_raw_write_unlock(lock)
-#define write_trylock(lock)		_raw_write_trylock(lock)
-#endif
+#define spin_lock_bh(lock) \
+do { \
+	local_bh_disable(); \
+	preempt_disable(); \
+	_raw_spin_lock(lock); \
+} while (0)
+
+#define read_lock_irqsave(lock, flags) \
+do { \
+	local_irq_save(flags); \
+	preempt_disable(); \
+	_raw_read_lock(lock); \
+} while (0)
+
+#define read_lock_irq(lock) \
+do { \
+	local_irq_disable(); \
+	preempt_disable(); \
+	_raw_read_lock(lock); \
+} while (0)
+
+#define read_lock_bh(lock) \
+do { \
+	local_bh_disable(); \
+	preempt_disable(); \
+	_raw_read_lock(lock); \
+} while (0)
+
+#define write_lock_irqsave(lock, flags) \
+do { \
+	local_irq_save(flags); \
+	preempt_disable(); \
+	_raw_write_lock(lock); \
+} while (0)
+
+#define write_lock_irq(lock) \
+do { \
+	local_irq_disable(); \
+	preempt_disable(); \
+	_raw_write_lock(lock); \
+} while (0)
+
+#define write_lock_bh(lock) \
+do { \
+	local_bh_disable(); \
+	preempt_disable(); \
+	_raw_write_lock(lock); \
+} while (0)
+
+#define spin_unlock_irqrestore(lock, flags) \
+do { \
+	_raw_spin_unlock(lock); \
+	local_irq_restore(flags); \
+	preempt_enable(); \
+} while (0)
+
+#define _raw_spin_unlock_irqrestore(lock, flags) \
+do { \
+	_raw_spin_unlock(lock); \
+	local_irq_restore(flags); \
+} while (0)
+
+#define spin_unlock_irq(lock) \
+do { \
+	_raw_spin_unlock(lock); \
+	local_irq_enable(); \
+	preempt_enable(); \
+} while (0)
+
+#define spin_unlock_bh(lock) \
+do { \
+	_raw_spin_unlock(lock); \
+	preempt_enable(); \
+	local_bh_enable(); \
+} while (0)
+
+#define read_unlock_irqrestore(lock, flags) \
+do { \
+	_raw_read_unlock(lock); \
+	local_irq_restore(flags); \
+	preempt_enable(); \
+} while (0)
+
+#define read_unlock_irq(lock) \
+do { \
+	_raw_read_unlock(lock); \
+	local_irq_enable(); \
+	preempt_enable(); \
+} while (0)
+
+#define read_unlock_bh(lock) \
+do { \
+	_raw_read_unlock(lock); \
+	preempt_enable(); \
+	local_bh_enable(); \
+} while (0)
+
+#define write_unlock_irqrestore(lock, flags) \
+do { \
+	_raw_write_unlock(lock); \
+	local_irq_restore(flags); \
+	preempt_enable(); \
+} while (0)
+
+#define write_unlock_irq(lock) \
+do { \
+	_raw_write_unlock(lock); \
+	local_irq_enable(); \
+	preempt_enable(); \
+} while (0)
+
+#define write_unlock_bh(lock) \
+do { \
+	_raw_write_unlock(lock); \
+	preempt_enable(); \
+	local_bh_enable(); \
+} while (0)
+
+#define spin_trylock_bh(lock)	({ local_bh_disable(); preempt_disable(); \
+				_raw_spin_trylock(lock) ? 1 : \
+				({preempt_enable(); local_bh_enable(); 0;});})
 
 /* "lock on reference count zero" */
 #ifndef ATOMIC_DEC_AND_LOCK
diff --git a/include/linux/ufs_fs.h b/include/linux/ufs_fs.h
index 7ba4e3e66e4e..dd9bc72d795e 100644
--- a/include/linux/ufs_fs.h
+++ b/include/linux/ufs_fs.h
@@ -33,6 +33,9 @@
 #include <linux/stat.h>
 #include <linux/fs.h>
 
+#include <linux/ufs_fs_i.h>
+#include <linux/ufs_fs_sb.h>
+
 #define UFS_BBLOCK 0
 #define UFS_BBSIZE 8192
 #define UFS_SBLOCK 8192
@@ -398,7 +401,7 @@ struct ufs_super_block {
  * Convert cylinder group to base address of its global summary info.
  */
 #define fs_cs(indx) \
-	u.ufs_sb.s_csp[(indx) >> uspi->s_csshift][(indx) & ~uspi->s_csmask]
+	s_csp[(indx) >> uspi->s_csshift][(indx) & ~uspi->s_csmask]
 
 /*
  * Cylinder group block for a file system.
@@ -780,7 +783,10 @@ extern struct inode_operations ufs_fast_symlink_inode_operations;
 /* truncate.c */
 extern void ufs_truncate (struct inode *);
 
-#include <linux/ufs_fs_i.h>
+static inline struct ufs_sb_info *UFS_SB(struct super_block *sb)
+{
+	return sb->u.generic_sbp;
+}
 
 static inline struct ufs_inode_info *UFS_I(struct inode *inode)
 {