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Documentation/filesystems: update documentation of file_operations 

...to kernel 4.18.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein 2018-08-27 15:56:01 +03:00 committed by Miklos Szeredi
parent 5b910bd615
commit 17ef445f9b
1 changed files with 16 additions and 2 deletions
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18
Documentation/filesystems/vfs.txt
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@ -848,7 +848,7 @@ struct file_operations
----------------------
This describes how the VFS can manipulate an open file. As of kernel
4.1, the following members are defined:
4.18, the following members are defined:
struct file_operations {
struct module *owner;
@ -858,11 +858,11 @@ struct file_operations {
ssize_t (*read_iter) (struct kiocb *, struct iov_iter *);
ssize_t (*write_iter) (struct kiocb *, struct iov_iter *);
int (*iterate) (struct file *, struct dir_context *);
int (*iterate_shared) (struct file *, struct dir_context *);
__poll_t (*poll) (struct file *, struct poll_table_struct *);
long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
int (*mmap) (struct file *, struct vm_area_struct *);
int (*mremap)(struct file *, struct vm_area_struct *);
int (*open) (struct inode *, struct file *);
int (*flush) (struct file *, fl_owner_t id);
int (*release) (struct inode *, struct file *);
@ -882,6 +882,9 @@ struct file_operations {
#ifndef CONFIG_MMU
unsigned (*mmap_capabilities)(struct file *);
#endif
ssize_t (*copy_file_range)(struct file *, loff_t, struct file *, loff_t, size_t, unsigned int);
int (*clone_file_range)(struct file *, loff_t, struct file *, loff_t, u64);
int (*dedupe_file_range)(struct file *, loff_t, struct file *, loff_t, u64);
};
Again, all methods are called without any locks being held, unless
@ -899,6 +902,9 @@ otherwise noted.
iterate: called when the VFS needs to read the directory contents
iterate_shared: called when the VFS needs to read the directory contents
when filesystem supports concurrent dir iterators
poll: called by the VFS when a process wants to check if there is
activity on this file and (optionally) go to sleep until there
is activity. Called by the select(2) and poll(2) system calls
@ -951,6 +957,14 @@ otherwise noted.
fallocate: called by the VFS to preallocate blocks or punch a hole.
copy_file_range: called by the copy_file_range(2) system call.
clone_file_range: called by the ioctl(2) system call for FICLONERANGE and
FICLONE commands.
dedupe_file_range: called by the ioctl(2) system call for FIDEDUPERANGE
command.
Note that the file operations are implemented by the specific
filesystem in which the inode resides. When opening a device node
(character or block special) most filesystems will call special