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: Borislav Petkov <bbpetkov@yahoo.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -3,7 +3,7 @@
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Original author: Richard Gooch <rgooch@atnf.csiro.au>
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Last updated on October 28, 2005
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Last updated on June 24, 2007.
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Copyright (C) 1999 Richard Gooch
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Copyright (C) 2005 Pekka Enberg
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@ -107,7 +107,7 @@ file /proc/filesystems.
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struct file_system_type
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-----------------------
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This describes the filesystem. As of kernel 2.6.13, the following
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This describes the filesystem. As of kernel 2.6.22, the following
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members are defined:
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struct file_system_type {
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@ -119,6 +119,8 @@ struct file_system_type {
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struct module *owner;
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struct file_system_type * next;
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struct list_head fs_supers;
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struct lock_class_key s_lock_key;
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struct lock_class_key s_umount_key;
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};
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name: the name of the filesystem type, such as "ext2", "iso9660",
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@ -137,11 +139,12 @@ struct file_system_type {
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next: for internal VFS use: you should initialize this to NULL
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s_lock_key, s_umount_key: lockdep-specific
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The get_sb() method has the following arguments:
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struct super_block *sb: the superblock structure. This is partially
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initialized by the VFS and the rest must be initialized by the
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get_sb() method
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struct file_system_type *fs_type: decribes the filesystem, partly initialized
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by the specific filesystem code
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int flags: mount flags
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@ -150,12 +153,13 @@ The get_sb() method has the following arguments:
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void *data: arbitrary mount options, usually comes as an ASCII
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string
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int silent: whether or not to be silent on error
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struct vfsmount *mnt: a vfs-internal representation of a mount point
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The get_sb() method must determine if the block device specified
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in the superblock contains a filesystem of the type the method
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supports. On success the method returns the superblock pointer, on
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failure it returns NULL.
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in the dev_name and fs_type contains a filesystem of the type the method
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supports. If it succeeds in opening the named block device, it initializes a
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struct super_block descriptor for the filesystem contained by the block device.
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On failure it returns an error.
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The most interesting member of the superblock structure that the
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get_sb() method fills in is the "s_op" field. This is a pointer to
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