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Commit 0746aec3 authored by Borislav Petkov's avatar Borislav Petkov Committed by Linus Torvalds
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update description in Documentation/filesystems/vfs.txt 



Update the description of struct file_system_type and get_sb() in
Documentation/filesystems/vfs.txt to match the current code.

Signed-off-by: default avatarBorislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 132e4b0a

Documentation/filesystems/vfs.txt

+13 −9
Original line number Diff line number Diff line
@@ -3,7 +3,7 @@ 


	Original author: Richard Gooch <rgooch@atnf.csiro.au>



		  Last updated on October 28, 2005

		  Last updated on June 24, 2007.



  Copyright (C) 1999 Richard Gooch

  Copyright (C) 2005 Pekka Enberg
@@ -107,7 +107,7 @@ file /proc/filesystems. 
struct file_system_type

-----------------------



This describes the filesystem. As of kernel 2.6.13, the following

This describes the filesystem. As of kernel 2.6.22, the following

members are defined:



struct file_system_type {
@@ -119,6 +119,8 @@ struct file_system_type { 
        struct module *owner;

        struct file_system_type * next;

        struct list_head fs_supers;

	struct lock_class_key s_lock_key;

	struct lock_class_key s_umount_key;

};



  name: the name of the filesystem type, such as "ext2", "iso9660",
@@ -137,11 +139,12 @@ struct file_system_type { 


  next: for internal VFS use: you should initialize this to NULL



  s_lock_key, s_umount_key: lockdep-specific



The get_sb() method has the following arguments:



  struct super_block *sb: the superblock structure. This is partially

	initialized by the VFS and the rest must be initialized by the

	get_sb() method

  struct file_system_type *fs_type: decribes the filesystem, partly initialized

  	by the specific filesystem code



  int flags: mount flags
@@ -150,12 +153,13 @@ The get_sb() method has the following arguments: 
  void *data: arbitrary mount options, usually comes as an ASCII

	string



  int silent: whether or not to be silent on error

  struct vfsmount *mnt: a vfs-internal representation of a mount point



The get_sb() method must determine if the block device specified

in the superblock contains a filesystem of the type the method

supports. On success the method returns the superblock pointer, on

failure it returns NULL.

in the dev_name and fs_type contains a filesystem of the type the method

supports. If it succeeds in opening the named block device, it initializes a

struct super_block descriptor for the filesystem contained by the block device.

On failure it returns an error.



The most interesting member of the superblock structure that the

get_sb() method fills in is the "s_op" field. This is a pointer to