4 files changed, 54 insertions, 35 deletions

diff --git a/fs/inode.c b/fs/inode.c
index f8cdf05b65a9..257f33f98e05 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -176,6 +176,7 @@ void inode_init_once(struct inode *inode)
 	spin_lock_init(&inode->i_data.private_lock);
 	INIT_LIST_HEAD(&inode->i_data.i_mmap);
 	INIT_LIST_HEAD(&inode->i_data.i_mmap_shared);
+	spin_lock_init(&inode->i_lock);
 }
 
 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
diff --git a/fs/stat.c b/fs/stat.c
index 375661315ecd..113f7d0c2bc0 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -316,3 +316,45 @@ asmlinkage long sys_fstat64(unsigned long fd, struct stat64 * statbuf, long flag
 }
 
 #endif /* LFS-64 */
+
+void inode_add_bytes(struct inode *inode, loff_t bytes)
+{
+	spin_lock(&inode->i_lock);
+	inode->i_blocks += bytes >> 9;
+	bytes &= 511;
+	inode->i_bytes += bytes;
+	if (inode->i_bytes >= 512) {
+		inode->i_blocks++;
+		inode->i_bytes -= 512;
+	}
+	spin_unlock(&inode->i_lock);
+}
+
+void inode_sub_bytes(struct inode *inode, loff_t bytes)
+{
+	spin_lock(&inode->i_lock);
+	inode->i_blocks -= bytes >> 9;
+	bytes &= 511;
+	if (inode->i_bytes < bytes) {
+		inode->i_blocks--;
+		inode->i_bytes += 512;
+	}
+	inode->i_bytes -= bytes;
+	spin_unlock(&inode->i_lock);
+}
+
+loff_t inode_get_bytes(struct inode *inode)
+{
+	loff_t ret;
+
+	spin_lock(&inode->i_lock);
+	ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
+	spin_unlock(&inode->i_lock);
+	return ret;
+}
+
+void inode_set_bytes(struct inode *inode, loff_t bytes)
+{
+	inode->i_blocks = bytes >> 9;
+	inode->i_bytes = bytes & 511;
+}
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 595ea1af33fd..76b32526394f 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -371,9 +371,10 @@ struct inode {
 	struct timespec		i_ctime;
 	unsigned int		i_blkbits;
 	unsigned long		i_blksize;
-	unsigned long		i_blocks;
 	unsigned long		i_version;
+	unsigned long		i_blocks;
 	unsigned short          i_bytes;
+	spinlock_t		i_lock;	/* i_blocks, i_bytes, maybe i_size */
 	struct semaphore	i_sem;
 	struct inode_operations	*i_op;
 	struct file_operations	*i_fop;	/* former ->i_op->default_file_ops */
@@ -400,7 +401,7 @@ struct inode {
 	void			*i_security;
 	__u32			i_generation;
 	union {
-		void				*generic_ip;
+		void		*generic_ip;
 	} u;
 };
 
@@ -412,39 +413,6 @@ struct fown_struct {
 	void *security;
 };
 
-static inline void inode_add_bytes(struct inode *inode, loff_t bytes)
-{
-	inode->i_blocks += bytes >> 9;
-	bytes &= 511;
-	inode->i_bytes += bytes;
-	if (inode->i_bytes >= 512) {
-		inode->i_blocks++;
-		inode->i_bytes -= 512;
-	}
-}
-
-static inline void inode_sub_bytes(struct inode *inode, loff_t bytes)
-{
-	inode->i_blocks -= bytes >> 9;
-	bytes &= 511;
-	if (inode->i_bytes < bytes) {
-		inode->i_blocks--;
-		inode->i_bytes += 512;
-	}
-	inode->i_bytes -= bytes;
-}
-
-static inline loff_t inode_get_bytes(struct inode *inode)
-{
-	return (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
-}
-
-static inline void inode_set_bytes(struct inode *inode, loff_t bytes)
-{
-	inode->i_blocks = bytes >> 9;
-	inode->i_bytes = bytes & 511;
-}
-
 /*
  * Track a single file's readahead state
  */
@@ -1277,6 +1245,10 @@ extern int page_symlink(struct inode *inode, const char *symname, int len);
 extern struct inode_operations page_symlink_inode_operations;
 extern void generic_fillattr(struct inode *, struct kstat *);
 extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
+void inode_add_bytes(struct inode *inode, loff_t bytes);
+void inode_sub_bytes(struct inode *inode, loff_t bytes);
+loff_t inode_get_bytes(struct inode *inode);
+void inode_set_bytes(struct inode *inode, loff_t bytes);
 
 extern int vfs_readdir(struct file *, filldir_t, void *);
 
diff --git a/kernel/ksyms.c b/kernel/ksyms.c
index 574addf5af63..d6f67455a7fe 100644
--- a/kernel/ksyms.c
+++ b/kernel/ksyms.c
@@ -272,6 +272,10 @@ EXPORT_SYMBOL(vfs_fstat);
 EXPORT_SYMBOL(vfs_stat);
 EXPORT_SYMBOL(vfs_lstat);
 EXPORT_SYMBOL(vfs_getattr);
+EXPORT_SYMBOL(inode_add_bytes);
+EXPORT_SYMBOL(inode_sub_bytes);
+EXPORT_SYMBOL(inode_get_bytes);
+EXPORT_SYMBOL(inode_set_bytes);
 EXPORT_SYMBOL(lock_rename);
 EXPORT_SYMBOL(unlock_rename);
 EXPORT_SYMBOL(generic_read_dir);