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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>
hifive-unleashed-5.1
Borislav Petkov 2007-07-15 23:41:43 -07:00 committed by Linus Torvalds
parent d52988023a
commit 422b14c2e2
1 changed files with 16 additions and 13 deletions
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29
Documentation/filesystems/vfs.txt
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@ -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