update Documentation/filesystems/vfs.txt

Update Documentation/filesystems/vfs.txt

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>

diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index f023609fa7185a3a1d69e83f8bdeee0cc7219b75..045f3e055a28932c76864a19696732311a4f9838 100644 (file)
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -197,7 +197,7 @@ struct super_operations
 -----------------------
 
 This describes how the VFS can manipulate the superblock of your
-filesystem. As of kernel 2.6.13, the following members are defined:
+filesystem. As of kernel 2.6.22, the following members are defined:
 
 struct super_operations {
         struct inode *(*alloc_inode)(struct super_block *sb);
@@ -220,8 +220,6 @@ struct super_operations {
         void (*clear_inode) (struct inode *);
         void (*umount_begin) (struct super_block *);
 
-        void (*sync_inodes) (struct super_block *sb,
-                                struct writeback_control *wbc);
         int (*show_options)(struct seq_file *, struct vfsmount *);
 
         ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
@@ -304,9 +302,6 @@ or bottom half).
 
   umount_begin: called when the VFS is unmounting a filesystem.
 
-  sync_inodes: called when the VFS is writing out dirty data associated with
-       a superblock.
-
   show_options: called by the VFS to show mount options for /proc/<pid>/mounts.
 
   quota_read: called by the VFS to read from filesystem quota file.
@@ -328,7 +323,7 @@ struct inode_operations
 -----------------------
 
 This describes how the VFS can manipulate an inode in your
-filesystem. As of kernel 2.6.13, the following members are defined:
+filesystem. As of kernel 2.6.22, the following members are defined:
 
 struct inode_operations {
        int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
@@ -352,6 +347,7 @@ struct inode_operations {
        ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
        ssize_t (*listxattr) (struct dentry *, char *, size_t);
        int (*removexattr) (struct dentry *, const char *);
+       void (*truncate_range)(struct inode *, loff_t, loff_t);
 };
 
 Again, all methods are called without any locks being held, unless
@@ -448,6 +444,9 @@ otherwise noted.
   removexattr: called by the VFS to remove an extended attribute from
        a file. This method is called by removexattr(2) system call.
 
+  truncate_range: a method provided by the underlying filesystem to truncate a
+       range of blocks , i.e. punch a hole somewhere in a file.
+
 
 The Address Space Object
 ========================
@@ -526,7 +525,7 @@ struct address_space_operations
 -------------------------------
 
 This describes how the VFS can manipulate mapping of a file to page cache in
-your filesystem. As of kernel 2.6.16, the following members are defined:
+your filesystem. As of kernel 2.6.22, the following members are defined:
 
 struct address_space_operations {
        int (*writepage)(struct page *page, struct writeback_control *wbc);
@@ -547,6 +546,7 @@ struct address_space_operations {
                        int);
        /* migrate the contents of a page to the specified target */
        int (*migratepage) (struct page *, struct page *);
+       int (*launder_page) (struct page *);
 };
 
   writepage: called by the VM to write a dirty page to backing store.
@@ -693,6 +693,10 @@ struct address_space_operations {
        transfer any private data across and update any references
         that it has to the page.
 
+  launder_page: Called before freeing a page - it writes back the dirty page. To
+       prevent redirtying the page, it is kept locked during the whole
+       operation.
+
 The File Object
 ===============
 
@@ -703,9 +707,10 @@ struct file_operations
 ----------------------
 
 This describes how the VFS can manipulate an open file. As of kernel
-2.6.17, the following members are defined:
+2.6.22, the following members are defined:
 
 struct file_operations {
+       struct module *owner;
        loff_t (*llseek) (struct file *, loff_t, int);
        ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
        ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
@@ -732,10 +737,8 @@ struct file_operations {
        int (*check_flags)(int);
        int (*dir_notify)(struct file *filp, unsigned long arg);
        int (*flock) (struct file *, int, struct file_lock *);
-       ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, size_t, unsigned 
-int);
-       ssize_t (*splice_read)(struct file *, struct pipe_inode_info *, size_t, unsigned  
-int);
+       ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, size_t, unsigned int);
+       ssize_t (*splice_read)(struct file *, struct pipe_inode_info *, size_t, unsigned int);
 };
 
 Again, all methods are called without any locks being held, unless