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update description in Documentation/filesystems/vfs.txt

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

Signed-off-by: Borislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Borislav Petkov 2007-07-15 23:41:19 -07:00 committed by Linus Torvalds
parent 132e4b0a04
commit 0746aec3c7
1 changed files with 13 additions and 9 deletions
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22
Documentation/filesystems/vfs.txt
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@ -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