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:
  [PATCH] fix SMP ordering hole in fcntl_setlk()
  [PATCH] kill ->put_inode
  [PATCH] fix reservation discarding in affs

10 files changed, 56 insertions, 62 deletions

diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index c2992bc..8b22d7d8 100644
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -92,7 +92,6 @@ prototypes:
 	void (*destroy_inode)(struct inode *);
 	void (*dirty_inode) (struct inode *);
 	int (*write_inode) (struct inode *, int);
-	void (*put_inode) (struct inode *);
 	void (*drop_inode) (struct inode *);
 	void (*delete_inode) (struct inode *);
 	void (*put_super) (struct super_block *);
@@ -115,7 +114,6 @@ alloc_inode:		no	no	no
 destroy_inode:		no
 dirty_inode:		no				(must not sleep)
 write_inode:		no
-put_inode:		no
 drop_inode:		no				!!!inode_lock!!!
 delete_inode:		no
 put_super:		yes	yes	no
diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index 81e5be6..b7522c6 100644
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -205,7 +205,6 @@ struct super_operations {
 
         void (*dirty_inode) (struct inode *);
         int (*write_inode) (struct inode *, int);
-        void (*put_inode) (struct inode *);
         void (*drop_inode) (struct inode *);
         void (*delete_inode) (struct inode *);
         void (*put_super) (struct super_block *);
@@ -246,9 +245,6 @@ or bottom half).
 	inode to disc.  The second parameter indicates whether the write
 	should be synchronous or not, not all filesystems check this flag.
 
-  put_inode: called when the VFS inode is removed from the inode
-	cache.
-
   drop_inode: called when the last access to the inode is dropped,
 	with the inode_lock spinlock held.
 
diff --git a/fs/affs/affs.h b/fs/affs/affs.h
index d5bd497..223b191 100644
--- a/fs/affs/affs.h
+++ b/fs/affs/affs.h
@@ -48,7 +48,7 @@ struct affs_ext_key {
  * affs fs inode data in memory
  */
 struct affs_inode_info {
-	u32	 i_opencnt;
+	atomic_t i_opencnt;
 	struct semaphore i_link_lock;		/* Protects internal inode access. */
 	struct semaphore i_ext_lock;		/* Protects internal inode access. */
 #define i_hash_lock i_ext_lock
@@ -170,8 +170,6 @@ extern int	affs_rename(struct inode *old_dir, struct dentry *old_dentry,
 extern unsigned long		 affs_parent_ino(struct inode *dir);
 extern struct inode		*affs_new_inode(struct inode *dir);
 extern int			 affs_notify_change(struct dentry *dentry, struct iattr *attr);
-extern void			 affs_put_inode(struct inode *inode);
-extern void			 affs_drop_inode(struct inode *inode);
 extern void			 affs_delete_inode(struct inode *inode);
 extern void			 affs_clear_inode(struct inode *inode);
 extern struct inode		*affs_iget(struct super_block *sb,
diff --git a/fs/affs/file.c b/fs/affs/file.c
index 1a4f092..6eac7bd 100644
--- a/fs/affs/file.c
+++ b/fs/affs/file.c
@@ -48,8 +48,9 @@ affs_file_open(struct inode *inode, struct file *filp)
 {
 	if (atomic_read(&filp->f_count) != 1)
 		return 0;
-	pr_debug("AFFS: open(%d)\n", AFFS_I(inode)->i_opencnt);
-	AFFS_I(inode)->i_opencnt++;
+	pr_debug("AFFS: open(%lu,%d)\n",
+		 inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt));
+	atomic_inc(&AFFS_I(inode)->i_opencnt);
 	return 0;
 }
 
@@ -58,10 +59,16 @@ affs_file_release(struct inode *inode, struct file *filp)
 {
 	if (atomic_read(&filp->f_count) != 0)
 		return 0;
-	pr_debug("AFFS: release(%d)\n", AFFS_I(inode)->i_opencnt);
-	AFFS_I(inode)->i_opencnt--;
-	if (!AFFS_I(inode)->i_opencnt)
+	pr_debug("AFFS: release(%lu, %d)\n",
+		 inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt));
+
+	if (atomic_dec_and_test(&AFFS_I(inode)->i_opencnt)) {
+		mutex_lock(&inode->i_mutex);
+		if (inode->i_size != AFFS_I(inode)->mmu_private)
+			affs_truncate(inode);
 		affs_free_prealloc(inode);
+		mutex_unlock(&inode->i_mutex);
+	}
 
 	return 0;
 }
@@ -180,7 +187,7 @@ affs_get_extblock(struct inode *inode, u32 ext)
 	/* inline the simplest case: same extended block as last time */
 	struct buffer_head *bh = AFFS_I(inode)->i_ext_bh;
 	if (ext == AFFS_I(inode)->i_ext_last)
-		atomic_inc(&bh->b_count);
+		get_bh(bh);
 	else
 		/* we have to do more (not inlined) */
 		bh = affs_get_extblock_slow(inode, ext);
@@ -306,7 +313,7 @@ store_ext:
 	affs_brelse(AFFS_I(inode)->i_ext_bh);
 	AFFS_I(inode)->i_ext_last = ext;
 	AFFS_I(inode)->i_ext_bh = bh;
-	atomic_inc(&bh->b_count);
+	get_bh(bh);
 
 	return bh;
 
@@ -324,7 +331,6 @@ affs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh_resul
 
 	pr_debug("AFFS: get_block(%u, %lu)\n", (u32)inode->i_ino, (unsigned long)block);
 
-
 	BUG_ON(block > (sector_t)0x7fffffffUL);
 
 	if (block >= AFFS_I(inode)->i_blkcnt) {
@@ -827,6 +833,8 @@ affs_truncate(struct inode *inode)
 		res = mapping->a_ops->write_begin(NULL, mapping, size, 0, 0, &page, &fsdata);
 		if (!res)
 			res = mapping->a_ops->write_end(NULL, mapping, size, 0, 0, page, fsdata);
+		else
+			inode->i_size = AFFS_I(inode)->mmu_private;
 		mark_inode_dirty(inode);
 		return;
 	} else if (inode->i_size == AFFS_I(inode)->mmu_private)
@@ -862,6 +870,7 @@ affs_truncate(struct inode *inode)
 		blk++;
 	} else
 		AFFS_HEAD(ext_bh)->first_data = 0;
+	AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(i);
 	size = AFFS_SB(sb)->s_hashsize;
 	if (size > blkcnt - blk + i)
 		size = blkcnt - blk + i;
diff --git a/fs/affs/inode.c b/fs/affs/inode.c
index 27fe6cb..a13b334 100644
--- a/fs/affs/inode.c
+++ b/fs/affs/inode.c
@@ -58,7 +58,7 @@ struct inode *affs_iget(struct super_block *sb, unsigned long ino)
 	AFFS_I(inode)->i_extcnt = 1;
 	AFFS_I(inode)->i_ext_last = ~1;
 	AFFS_I(inode)->i_protect = prot;
-	AFFS_I(inode)->i_opencnt = 0;
+	atomic_set(&AFFS_I(inode)->i_opencnt, 0);
 	AFFS_I(inode)->i_blkcnt = 0;
 	AFFS_I(inode)->i_lc = NULL;
 	AFFS_I(inode)->i_lc_size = 0;
@@ -108,8 +108,6 @@ struct inode *affs_iget(struct super_block *sb, unsigned long ino)
 			inode->i_mode |= S_IFDIR;
 		} else
 			inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
-		if (tail->link_chain)
-			inode->i_nlink = 2;
 		/* Maybe it should be controlled by mount parameter? */
 		//inode->i_mode |= S_ISVTX;
 		inode->i_op = &affs_dir_inode_operations;
@@ -245,31 +243,12 @@ out:
 }
 
 void
-affs_put_inode(struct inode *inode)
-{
-	pr_debug("AFFS: put_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
-	affs_free_prealloc(inode);
-}
-
-void
-affs_drop_inode(struct inode *inode)
-{
-	mutex_lock(&inode->i_mutex);
-	if (inode->i_size != AFFS_I(inode)->mmu_private)
-		affs_truncate(inode);
-	mutex_unlock(&inode->i_mutex);
-
-	generic_drop_inode(inode);
-}
-
-void
 affs_delete_inode(struct inode *inode)
 {
 	pr_debug("AFFS: delete_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
 	truncate_inode_pages(&inode->i_data, 0);
 	inode->i_size = 0;
-	if (S_ISREG(inode->i_mode))
-		affs_truncate(inode);
+	affs_truncate(inode);
 	clear_inode(inode);
 	affs_free_block(inode->i_sb, inode->i_ino);
 }
@@ -277,9 +256,12 @@ affs_delete_inode(struct inode *inode)
 void
 affs_clear_inode(struct inode *inode)
 {
-	unsigned long cache_page = (unsigned long) AFFS_I(inode)->i_lc;
+	unsigned long cache_page;
 
 	pr_debug("AFFS: clear_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
+
+	affs_free_prealloc(inode);
+	cache_page = (unsigned long)AFFS_I(inode)->i_lc;
 	if (cache_page) {
 		pr_debug("AFFS: freeing ext cache\n");
 		AFFS_I(inode)->i_lc = NULL;
@@ -316,7 +298,7 @@ affs_new_inode(struct inode *dir)
 	inode->i_ino     = block;
 	inode->i_nlink   = 1;
 	inode->i_mtime   = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
-	AFFS_I(inode)->i_opencnt = 0;
+	atomic_set(&AFFS_I(inode)->i_opencnt, 0);
 	AFFS_I(inode)->i_blkcnt = 0;
 	AFFS_I(inode)->i_lc = NULL;
 	AFFS_I(inode)->i_lc_size = 0;
@@ -369,12 +351,12 @@ affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s3
 	switch (type) {
 	case ST_LINKFILE:
 	case ST_LINKDIR:
-		inode_bh = bh;
 		retval = -ENOSPC;
 		block = affs_alloc_block(dir, dir->i_ino);
 		if (!block)
 			goto err;
 		retval = -EIO;
+		inode_bh = bh;
 		bh = affs_getzeroblk(sb, block);
 		if (!bh)
 			goto err;
diff --git a/fs/affs/namei.c b/fs/affs/namei.c
index 2218f1e..cfcf1b6 100644
--- a/fs/affs/namei.c
+++ b/fs/affs/namei.c
@@ -234,7 +234,8 @@ affs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
 int
 affs_unlink(struct inode *dir, struct dentry *dentry)
 {
-	pr_debug("AFFS: unlink(dir=%d, \"%.*s\")\n", (u32)dir->i_ino,
+	pr_debug("AFFS: unlink(dir=%d, %lu \"%.*s\")\n", (u32)dir->i_ino,
+		 dentry->d_inode->i_ino,
 		 (int)dentry->d_name.len, dentry->d_name.name);
 
 	return affs_remove_header(dentry);
@@ -302,7 +303,8 @@ affs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 int
 affs_rmdir(struct inode *dir, struct dentry *dentry)
 {
-	pr_debug("AFFS: rmdir(dir=%u, \"%.*s\")\n", (u32)dir->i_ino,
+	pr_debug("AFFS: rmdir(dir=%u, %lu \"%.*s\")\n", (u32)dir->i_ino,
+		 dentry->d_inode->i_ino,
 		 (int)dentry->d_name.len, dentry->d_name.name);
 
 	return affs_remove_header(dentry);
diff --git a/fs/affs/super.c b/fs/affs/super.c
index 01d25d532..d214837 100644
--- a/fs/affs/super.c
+++ b/fs/affs/super.c
@@ -71,12 +71,18 @@ static struct kmem_cache * affs_inode_cachep;
 
 static struct inode *affs_alloc_inode(struct super_block *sb)
 {
-	struct affs_inode_info *ei;
-	ei = (struct affs_inode_info *)kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
-	if (!ei)
+	struct affs_inode_info *i;
+
+	i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
+	if (!i)
 		return NULL;
-	ei->vfs_inode.i_version = 1;
-	return &ei->vfs_inode;
+
+	i->vfs_inode.i_version = 1;
+	i->i_lc = NULL;
+	i->i_ext_bh = NULL;
+	i->i_pa_cnt = 0;
+
+	return &i->vfs_inode;
 }
 
 static void affs_destroy_inode(struct inode *inode)
@@ -114,8 +120,6 @@ static const struct super_operations affs_sops = {
 	.alloc_inode	= affs_alloc_inode,
 	.destroy_inode	= affs_destroy_inode,
 	.write_inode	= affs_write_inode,
-	.put_inode	= affs_put_inode,
-	.drop_inode	= affs_drop_inode,
 	.delete_inode	= affs_delete_inode,
 	.clear_inode	= affs_clear_inode,
 	.put_super	= affs_put_super,
diff --git a/fs/inode.c b/fs/inode.c
index bf64781..18bdce1 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1153,9 +1153,6 @@ void iput(struct inode *inode)
 
 		BUG_ON(inode->i_state == I_CLEAR);
 
-		if (op && op->put_inode)
-			op->put_inode(inode);
-
 		if (atomic_dec_and_lock(&inode->i_count, &inode_lock))
 			iput_final(inode);
 	}
diff --git a/fs/locks.c b/fs/locks.c
index 663c069..0ac6b92 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1753,6 +1753,7 @@ int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd,
 	struct file_lock *file_lock = locks_alloc_lock();
 	struct flock flock;
 	struct inode *inode;
+	struct file *f;
 	int error;
 
 	if (file_lock == NULL)
@@ -1825,7 +1826,15 @@ again:
 	 * Attempt to detect a close/fcntl race and recover by
 	 * releasing the lock that was just acquired.
 	 */
-	if (!error && fcheck(fd) != filp && flock.l_type != F_UNLCK) {
+	/*
+	 * we need that spin_lock here - it prevents reordering between
+	 * update of inode->i_flock and check for it done in close().
+	 * rcu_read_lock() wouldn't do.
+	 */
+	spin_lock(&current->files->file_lock);
+	f = fcheck(fd);
+	spin_unlock(&current->files->file_lock);
+	if (!error && f != filp && flock.l_type != F_UNLCK) {
 		flock.l_type = F_UNLCK;
 		goto again;
 	}
@@ -1881,6 +1890,7 @@ int fcntl_setlk64(unsigned int fd, struct file *filp, unsigned int cmd,
 	struct file_lock *file_lock = locks_alloc_lock();
 	struct flock64 flock;
 	struct inode *inode;
+	struct file *f;
 	int error;
 
 	if (file_lock == NULL)
@@ -1953,7 +1963,10 @@ again:
 	 * Attempt to detect a close/fcntl race and recover by
 	 * releasing the lock that was just acquired.
 	 */
-	if (!error && fcheck(fd) != filp && flock.l_type != F_UNLCK) {
+	spin_lock(&current->files->file_lock);
+	f = fcheck(fd);
+	spin_unlock(&current->files->file_lock);
+	if (!error && f != filp && flock.l_type != F_UNLCK) {
 		flock.l_type = F_UNLCK;
 		goto again;
 	}
diff --git a/include/linux/fs.h b/include/linux/fs.h
index a1ba005..7e0fa9e 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1289,17 +1289,12 @@ extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
 extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
 		unsigned long, loff_t *);
 
-/*
- * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
- * without the big kernel lock held in all filesystems.
- */
 struct super_operations {
    	struct inode *(*alloc_inode)(struct super_block *sb);
 	void (*destroy_inode)(struct inode *);
 
    	void (*dirty_inode) (struct inode *);
 	int (*write_inode) (struct inode *, int);
-	void (*put_inode) (struct inode *);
 	void (*drop_inode) (struct inode *);
 	void (*delete_inode) (struct inode *);
 	void (*put_super) (struct super_block *);