vfs: define kernel_read_file_id enumeration

[mirror_ubuntu-zesty-kernel.git] / include / linux / fs.h

diff --git a/include/linux/fs.h b/include/linux/fs.h
index eb73d74ed99262c83f2fa5e51582b2da0344bafa..aa84bcb9c3684c49ccc2b9417e63a6a06b9ea92c 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -433,7 +433,8 @@ struct address_space {
        struct rw_semaphore     i_mmap_rwsem;   /* protect tree, count, list */
        /* Protected by tree_lock together with the radix tree */
        unsigned long           nrpages;        /* number of total pages */
-       unsigned long           nrshadows;      /* number of shadow entries */
+       /* number of shadow or DAX exceptional entries */
+       unsigned long           nrexceptional;
        pgoff_t                 writeback_index;/* writeback starts here */
        const struct address_space_operations *a_ops;   /* methods */
        unsigned long           flags;          /* error bits/gfp mask */
@@ -483,9 +484,6 @@ struct block_device {
        int                     bd_fsfreeze_count;
        /* Mutex for freeze */
        struct mutex            bd_fsfreeze_mutex;
-#ifdef CONFIG_FS_DAX
-       int                     bd_map_count;
-#endif
 };
 
 /*
@@ -714,6 +712,31 @@ enum inode_i_mutex_lock_class
        I_MUTEX_PARENT2,
 };
 
+static inline void inode_lock(struct inode *inode)
+{
+       mutex_lock(&inode->i_mutex);
+}
+
+static inline void inode_unlock(struct inode *inode)
+{
+       mutex_unlock(&inode->i_mutex);
+}
+
+static inline int inode_trylock(struct inode *inode)
+{
+       return mutex_trylock(&inode->i_mutex);
+}
+
+static inline int inode_is_locked(struct inode *inode)
+{
+       return mutex_is_locked(&inode->i_mutex);
+}
+
+static inline void inode_lock_nested(struct inode *inode, unsigned subclass)
+{
+       mutex_lock_nested(&inode->i_mutex, subclass);
+}
+
 void lock_two_nondirectories(struct inode *, struct inode*);
 void unlock_two_nondirectories(struct inode *, struct inode*);
 
@@ -2553,7 +2576,13 @@ static inline void i_readcount_inc(struct inode *inode)
 #endif
 extern int do_pipe_flags(int *, int);
 
+enum kernel_read_file_id {
+       READING_MAX_ID
+};
+
 extern int kernel_read(struct file *, loff_t, char *, unsigned long);
+extern int kernel_read_file(struct file *, void **, loff_t *, loff_t,
+                           enum kernel_read_file_id);
 extern ssize_t kernel_write(struct file *, const char *, size_t, loff_t);
 extern ssize_t __kernel_write(struct file *, const char *, size_t, loff_t *);
 extern struct file * open_exec(const char *);
@@ -2881,7 +2910,7 @@ extern void replace_mount_options(struct super_block *sb, char *options);
 
 static inline bool io_is_direct(struct file *filp)
 {
-       return (filp->f_flags & O_DIRECT) || IS_DAX(file_inode(filp));
+       return (filp->f_flags & O_DIRECT) || IS_DAX(filp->f_mapping->host);
 }
 
 static inline int iocb_flags(struct file *file)
@@ -3047,8 +3076,8 @@ static inline bool dir_emit_dots(struct file *file, struct dir_context *ctx)
 }
 static inline bool dir_relax(struct inode *inode)
 {
-       mutex_unlock(&inode->i_mutex);
-       mutex_lock(&inode->i_mutex);
+       inode_unlock(inode);
+       inode_lock(inode);
        return !IS_DEADDIR(inode);
 }