Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6:
  fs: brlock vfsmount_lock
  fs: scale files_lock
  lglock: introduce special lglock and brlock spin locks
  tty: fix fu_list abuse
  fs: cleanup files_lock locking
  fs: remove extra lookup in __lookup_hash
  fs: fs_struct rwlock to spinlock
  apparmor: use task path helpers
  fs: dentry allocation consolidation
  fs: fix do_lookup false negative
  mbcache: Limit the maximum number of cache entries
  hostfs ->follow_link() braino
  hostfs: dumb (and usually harmless) tpyo - strncpy instead of strlcpy
  remove SWRITE* I/O types
  kill BH_Ordered flag
  vfs: update ctime when changing the file's permission by setfacl
  cramfs: only unlock new inodes
  fix reiserfs_evict_inode end_writeback second call

5 files changed, 197 insertions, 23 deletions

diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 43e649a7252..ec94c12f21d 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -32,7 +32,6 @@ enum bh_state_bits {
 	BH_Delay,	/* Buffer is not yet allocated on disk */
 	BH_Boundary,	/* Block is followed by a discontiguity */
 	BH_Write_EIO,	/* I/O error on write */
-	BH_Ordered,	/* ordered write */
 	BH_Eopnotsupp,	/* operation not supported (barrier) */
 	BH_Unwritten,	/* Buffer is allocated on disk but not written */
 	BH_Quiet,	/* Buffer Error Prinks to be quiet */
@@ -125,7 +124,6 @@ BUFFER_FNS(Async_Write, async_write)
 BUFFER_FNS(Delay, delay)
 BUFFER_FNS(Boundary, boundary)
 BUFFER_FNS(Write_EIO, write_io_error)
-BUFFER_FNS(Ordered, ordered)
 BUFFER_FNS(Eopnotsupp, eopnotsupp)
 BUFFER_FNS(Unwritten, unwritten)
 
@@ -183,6 +181,8 @@ void unlock_buffer(struct buffer_head *bh);
 void __lock_buffer(struct buffer_head *bh);
 void ll_rw_block(int, int, struct buffer_head * bh[]);
 int sync_dirty_buffer(struct buffer_head *bh);
+int __sync_dirty_buffer(struct buffer_head *bh, int rw);
+void write_dirty_buffer(struct buffer_head *bh, int rw);
 int submit_bh(int, struct buffer_head *);
 void write_boundary_block(struct block_device *bdev,
 			sector_t bblock, unsigned blocksize);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 9a96b4d83fc..76041b61475 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -125,9 +125,6 @@ struct inodes_stat_t {
  *			block layer could (in theory) choose to ignore this
  *			request if it runs into resource problems.
  * WRITE		A normal async write. Device will be plugged.
- * SWRITE		Like WRITE, but a special case for ll_rw_block() that
- *			tells it to lock the buffer first. Normally a buffer
- *			must be locked before doing IO.
  * WRITE_SYNC_PLUG	Synchronous write. Identical to WRITE, but passes down
  *			the hint that someone will be waiting on this IO
  *			shortly. The device must still be unplugged explicitly,
@@ -138,9 +135,6 @@ struct inodes_stat_t {
  *			immediately after submission. The write equivalent
  *			of READ_SYNC.
  * WRITE_ODIRECT_PLUG	Special case write for O_DIRECT only.
- * SWRITE_SYNC
- * SWRITE_SYNC_PLUG	Like WRITE_SYNC/WRITE_SYNC_PLUG, but locks the buffer.
- *			See SWRITE.
  * WRITE_BARRIER	Like WRITE_SYNC, but tells the block layer that all
  *			previously submitted writes must be safely on storage
  *			before this one is started. Also guarantees that when
@@ -155,7 +149,6 @@ struct inodes_stat_t {
 #define READ			0
 #define WRITE			RW_MASK
 #define READA			RWA_MASK
-#define SWRITE			(WRITE | READA)
 
 #define READ_SYNC		(READ | REQ_SYNC | REQ_UNPLUG)
 #define READ_META		(READ | REQ_META)
@@ -165,8 +158,6 @@ struct inodes_stat_t {
 #define WRITE_META		(WRITE | REQ_META)
 #define WRITE_BARRIER		(WRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG | \
 				 REQ_HARDBARRIER)
-#define SWRITE_SYNC_PLUG	(SWRITE | REQ_SYNC | REQ_NOIDLE)
-#define SWRITE_SYNC		(SWRITE | REQ_SYNC | REQ_NOIDLE | REQ_UNPLUG)
 
 /*
  * These aren't really reads or writes, they pass down information about
@@ -929,6 +920,9 @@ struct file {
 #define f_vfsmnt	f_path.mnt
 	const struct file_operations	*f_op;
 	spinlock_t		f_lock;  /* f_ep_links, f_flags, no IRQ */
+#ifdef CONFIG_SMP
+	int			f_sb_list_cpu;
+#endif
 	atomic_long_t		f_count;
 	unsigned int 		f_flags;
 	fmode_t			f_mode;
@@ -953,9 +947,6 @@ struct file {
 	unsigned long f_mnt_write_state;
 #endif
 };
-extern spinlock_t files_lock;
-#define file_list_lock() spin_lock(&files_lock);
-#define file_list_unlock() spin_unlock(&files_lock);
 
 #define get_file(x)	atomic_long_inc(&(x)->f_count)
 #define fput_atomic(x)	atomic_long_add_unless(&(x)->f_count, -1, 1)
@@ -1346,7 +1337,11 @@ struct super_block {
 
 	struct list_head	s_inodes;	/* all inodes */
 	struct hlist_head	s_anon;		/* anonymous dentries for (nfs) exporting */
+#ifdef CONFIG_SMP
+	struct list_head __percpu *s_files;
+#else
 	struct list_head	s_files;
+#endif
 	/* s_dentry_lru and s_nr_dentry_unused are protected by dcache_lock */
 	struct list_head	s_dentry_lru;	/* unused dentry lru */
 	int			s_nr_dentry_unused;	/* # of dentry on lru */
@@ -2197,8 +2192,6 @@ static inline void insert_inode_hash(struct inode *inode) {
 	__insert_inode_hash(inode, inode->i_ino);
 }
 
-extern void file_move(struct file *f, struct list_head *list);
-extern void file_kill(struct file *f);
 #ifdef CONFIG_BLOCK
 extern void submit_bio(int, struct bio *);
 extern int bdev_read_only(struct block_device *);
diff --git a/include/linux/fs_struct.h b/include/linux/fs_struct.h
index eca3d520213..a42b5bf02f8 100644
--- a/include/linux/fs_struct.h
+++ b/include/linux/fs_struct.h
@@ -5,7 +5,7 @@
 
 struct fs_struct {
 	int users;
-	rwlock_t lock;
+	spinlock_t lock;
 	int umask;
 	int in_exec;
 	struct path root, pwd;
@@ -23,29 +23,29 @@ extern int unshare_fs_struct(void);
 
 static inline void get_fs_root(struct fs_struct *fs, struct path *root)
 {
-	read_lock(&fs->lock);
+	spin_lock(&fs->lock);
 	*root = fs->root;
 	path_get(root);
-	read_unlock(&fs->lock);
+	spin_unlock(&fs->lock);
 }
 
 static inline void get_fs_pwd(struct fs_struct *fs, struct path *pwd)
 {
-	read_lock(&fs->lock);
+	spin_lock(&fs->lock);
 	*pwd = fs->pwd;
 	path_get(pwd);
-	read_unlock(&fs->lock);
+	spin_unlock(&fs->lock);
 }
 
 static inline void get_fs_root_and_pwd(struct fs_struct *fs, struct path *root,
 				       struct path *pwd)
 {
-	read_lock(&fs->lock);
+	spin_lock(&fs->lock);
 	*root = fs->root;
 	path_get(root);
 	*pwd = fs->pwd;
 	path_get(pwd);
-	read_unlock(&fs->lock);
+	spin_unlock(&fs->lock);
 }
 
 #endif /* _LINUX_FS_STRUCT_H */
diff --git a/include/linux/lglock.h b/include/linux/lglock.h
new file mode 100644
index 00000000000..b288cb713b9
--- /dev/null
+++ b/include/linux/lglock.h
@@ -0,0 +1,172 @@
+/*
+ * Specialised local-global spinlock. Can only be declared as global variables
+ * to avoid overhead and keep things simple (and we don't want to start using
+ * these inside dynamically allocated structures).
+ *
+ * "local/global locks" (lglocks) can be used to:
+ *
+ * - Provide fast exclusive access to per-CPU data, with exclusive access to
+ *   another CPU's data allowed but possibly subject to contention, and to
+ *   provide very slow exclusive access to all per-CPU data.
+ * - Or to provide very fast and scalable read serialisation, and to provide
+ *   very slow exclusive serialisation of data (not necessarily per-CPU data).
+ *
+ * Brlocks are also implemented as a short-hand notation for the latter use
+ * case.
+ *
+ * Copyright 2009, 2010, Nick Piggin, Novell Inc.
+ */
+#ifndef __LINUX_LGLOCK_H
+#define __LINUX_LGLOCK_H
+
+#include <linux/spinlock.h>
+#include <linux/lockdep.h>
+#include <linux/percpu.h>
+
+/* can make br locks by using local lock for read side, global lock for write */
+#define br_lock_init(name)	name##_lock_init()
+#define br_read_lock(name)	name##_local_lock()
+#define br_read_unlock(name)	name##_local_unlock()
+#define br_write_lock(name)	name##_global_lock_online()
+#define br_write_unlock(name)	name##_global_unlock_online()
+
+#define DECLARE_BRLOCK(name)	DECLARE_LGLOCK(name)
+#define DEFINE_BRLOCK(name)	DEFINE_LGLOCK(name)
+
+
+#define lg_lock_init(name)	name##_lock_init()
+#define lg_local_lock(name)	name##_local_lock()
+#define lg_local_unlock(name)	name##_local_unlock()
+#define lg_local_lock_cpu(name, cpu)	name##_local_lock_cpu(cpu)
+#define lg_local_unlock_cpu(name, cpu)	name##_local_unlock_cpu(cpu)
+#define lg_global_lock(name)	name##_global_lock()
+#define lg_global_unlock(name)	name##_global_unlock()
+#define lg_global_lock_online(name) name##_global_lock_online()
+#define lg_global_unlock_online(name) name##_global_unlock_online()
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+#define LOCKDEP_INIT_MAP lockdep_init_map
+
+#define DEFINE_LGLOCK_LOCKDEP(name)					\
+ struct lock_class_key name##_lock_key;					\
+ struct lockdep_map name##_lock_dep_map;				\
+ EXPORT_SYMBOL(name##_lock_dep_map)
+
+#else
+#define LOCKDEP_INIT_MAP(a, b, c, d)
+
+#define DEFINE_LGLOCK_LOCKDEP(name)
+#endif
+
+
+#define DECLARE_LGLOCK(name)						\
+ extern void name##_lock_init(void);					\
+ extern void name##_local_lock(void);					\
+ extern void name##_local_unlock(void);					\
+ extern void name##_local_lock_cpu(int cpu);				\
+ extern void name##_local_unlock_cpu(int cpu);				\
+ extern void name##_global_lock(void);					\
+ extern void name##_global_unlock(void);				\
+ extern void name##_global_lock_online(void);				\
+ extern void name##_global_unlock_online(void);				\
+
+#define DEFINE_LGLOCK(name)						\
+									\
+ DEFINE_PER_CPU(arch_spinlock_t, name##_lock);				\
+ DEFINE_LGLOCK_LOCKDEP(name);						\
+									\
+ void name##_lock_init(void) {						\
+	int i;								\
+	LOCKDEP_INIT_MAP(&name##_lock_dep_map, #name, &name##_lock_key, 0); \
+	for_each_possible_cpu(i) {					\
+		arch_spinlock_t *lock;					\
+		lock = &per_cpu(name##_lock, i);			\
+		*lock = (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;	\
+	}								\
+ }									\
+ EXPORT_SYMBOL(name##_lock_init);					\
+									\
+ void name##_local_lock(void) {						\
+	arch_spinlock_t *lock;						\
+	preempt_disable();						\
+	rwlock_acquire_read(&name##_lock_dep_map, 0, 0, _THIS_IP_);	\
+	lock = &__get_cpu_var(name##_lock);				\
+	arch_spin_lock(lock);						\
+ }									\
+ EXPORT_SYMBOL(name##_local_lock);					\
+									\
+ void name##_local_unlock(void) {					\
+	arch_spinlock_t *lock;						\
+	rwlock_release(&name##_lock_dep_map, 1, _THIS_IP_);		\
+	lock = &__get_cpu_var(name##_lock);				\
+	arch_spin_unlock(lock);						\
+	preempt_enable();						\
+ }									\
+ EXPORT_SYMBOL(name##_local_unlock);					\
+									\
+ void name##_local_lock_cpu(int cpu) {					\
+	arch_spinlock_t *lock;						\
+	preempt_disable();						\
+	rwlock_acquire_read(&name##_lock_dep_map, 0, 0, _THIS_IP_);	\
+	lock = &per_cpu(name##_lock, cpu);				\
+	arch_spin_lock(lock);						\
+ }									\
+ EXPORT_SYMBOL(name##_local_lock_cpu);					\
+									\
+ void name##_local_unlock_cpu(int cpu) {				\
+	arch_spinlock_t *lock;						\
+	rwlock_release(&name##_lock_dep_map, 1, _THIS_IP_);		\
+	lock = &per_cpu(name##_lock, cpu);				\
+	arch_spin_unlock(lock);						\
+	preempt_enable();						\
+ }									\
+ EXPORT_SYMBOL(name##_local_unlock_cpu);				\
+									\
+ void name##_global_lock_online(void) {					\
+	int i;								\
+	preempt_disable();						\
+	rwlock_acquire(&name##_lock_dep_map, 0, 0, _RET_IP_);		\
+	for_each_online_cpu(i) {					\
+		arch_spinlock_t *lock;					\
+		lock = &per_cpu(name##_lock, i);			\
+		arch_spin_lock(lock);					\
+	}								\
+ }									\
+ EXPORT_SYMBOL(name##_global_lock_online);				\
+									\
+ void name##_global_unlock_online(void) {				\
+	int i;								\
+	rwlock_release(&name##_lock_dep_map, 1, _RET_IP_);		\
+	for_each_online_cpu(i) {					\
+		arch_spinlock_t *lock;					\
+		lock = &per_cpu(name##_lock, i);			\
+		arch_spin_unlock(lock);					\
+	}								\
+	preempt_enable();						\
+ }									\
+ EXPORT_SYMBOL(name##_global_unlock_online);				\
+									\
+ void name##_global_lock(void) {					\
+	int i;								\
+	preempt_disable();						\
+	rwlock_acquire(&name##_lock_dep_map, 0, 0, _RET_IP_);		\
+	for_each_online_cpu(i) {					\
+		arch_spinlock_t *lock;					\
+		lock = &per_cpu(name##_lock, i);			\
+		arch_spin_lock(lock);					\
+	}								\
+ }									\
+ EXPORT_SYMBOL(name##_global_lock);					\
+									\
+ void name##_global_unlock(void) {					\
+	int i;								\
+	rwlock_release(&name##_lock_dep_map, 1, _RET_IP_);		\
+	for_each_online_cpu(i) {					\
+		arch_spinlock_t *lock;					\
+		lock = &per_cpu(name##_lock, i);			\
+		arch_spin_unlock(lock);					\
+	}								\
+	preempt_enable();						\
+ }									\
+ EXPORT_SYMBOL(name##_global_unlock);
+#endif
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 1437da3ddc6..67d64e6efe7 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -329,6 +329,13 @@ struct tty_struct {
 	struct tty_port *port;
 };
 
+/* Each of a tty's open files has private_data pointing to tty_file_private */
+struct tty_file_private {
+	struct tty_struct *tty;
+	struct file *file;
+	struct list_head list;
+};
+
 /* tty magic number */
 #define TTY_MAGIC		0x5401
 
@@ -458,6 +465,7 @@ extern void proc_clear_tty(struct task_struct *p);
 extern struct tty_struct *get_current_tty(void);
 extern void tty_default_fops(struct file_operations *fops);
 extern struct tty_struct *alloc_tty_struct(void);
+extern void tty_add_file(struct tty_struct *tty, struct file *file);
 extern void free_tty_struct(struct tty_struct *tty);
 extern void initialize_tty_struct(struct tty_struct *tty,
 		struct tty_driver *driver, int idx);
@@ -470,6 +478,7 @@ extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty);
 extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty);
 
 extern struct mutex tty_mutex;
+extern spinlock_t tty_files_lock;
 
 extern void tty_write_unlock(struct tty_struct *tty);
 extern int tty_write_lock(struct tty_struct *tty, int ndelay);