File operations
[MySQL FS Kernel Module]

Classes
struct	write_buffer
Functions
ssize_t	rkfs_file_read (struct file *filp, char __user *buf, size_t count, loff_t *ppos)
	Function for read from file.
ssize_t	rkfs_file_write (struct file *filp, const char __user *buf, size_t count, loff_t *ppos)
	Function for write to file.
int	rkfs_file_open (struct inode *inode, struct file *file)
	Function for open file.
int	rkfs_file_release (struct inode *ino, struct file *file)
	Function for release file.
int	rkfs_file_readdir (struct file *file, void *dirent, filldir_t filldir)
	Read dir.
loff_t	rkfs_file_llseek (struct file *file, loff_t offset, int origin)
	Lseek.
Variables
file_operations	rkfs_fops

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Function Documentation

loff_t rkfs_file_llseek	(	struct file *	file,
		loff_t	offset,
		int	origin
	)

Lseek.

Impelementation of lseek handler of VFS call ...

Parameters:

	file	Pointer to a file structure representing file to be read from.
	offset	Where to seek.
	origin	Start point of seek call.

Returns:

return Value of generic lseek operation.

1 OK.

Definition at line 417 of file fs_file.c.

References FSPDEBUG.

int rkfs_file_open	(	struct inode *	inode,
		struct file *	file
	)

Function for open file.

Open file ...

Parameters:

	inode.
	file.

Returns:

Return value of function generic_file_open.

Definition at line 309 of file fs_file.c.

References FSPDEBUG.

ssize_t rkfs_file_read	(	struct file *	filp,
		char __user *	buf,
		size_t	count,
		loff_t *	ppos
	)

Function for read from file.

Read up to count bytes from file represented by file structure pointed by filp.

Parameters:

	filp	Pointer to a file structure to be readen from.
	buf	Whereto place readen data.
	count	Maximum amount of readen bytes.
	ppos	Position in file.

Returns:

number realy readen bytes.

Definition at line 65 of file fs_file.c.

References CMD_ER_NR, struct_command::command_nr, struct_command::data, FSPDEBUG, MAX_QUERY_LENGTH, query(), ret_command, RKFS_BLOCKSIZE, and RKFS_DEF_QUERY_OK.

int rkfs_file_readdir	(	struct file *	file,
		void *	dirent,
		filldir_t	filldir
	)

Read dir.

Impelementation of readdir handler of VFS call ...

Parameters:

	file	Pointer to a file structure epresenting directory to read.
	dirent	Dirent to filled.
	filldir	pointer to a Function for filling a dirent.

Returns:

0 on error.

1 OK.

Definition at line 348 of file fs_file.c.

References CMD_OK_NR, struct_command::command_nr, struct_command::data, FSPDEBUG, MAX_ID_LENGTH, MAX_NAME_LENGTH, MAX_QUERY_LENGTH, struct_command::param, query(), ret_command, rkfs_atoi(), and rkfs_next_data_item().

int rkfs_file_release	(	struct inode *	ino,
		struct file *	file
	)

Function for release file.

Release file, used by CFS call release file ...

Parameters:

	ino	Inode representing a file to be released. Omitted.
	file	File structure representing a file to be released. Omitted.

Returns:

always 0

Definition at line 329 of file fs_file.c.

References FSPDEBUG.

ssize_t rkfs_file_write	(	struct file *	filp,
		const char __user *	buf,
		size_t	count,
		loff_t *	ppos
	)

Function for write to file.

Write up to count bytes from buf to file repesente by file structure poited by filp.

Parameters:

	filp	Pointer to a to file structure.
	buf	Buffer for incoming data.
	count	Maximum amount of bytes to written to the file.
	ppos	Position in the file.

Returns:

Number realy readen bytes.

Definition at line 147 of file fs_file.c.

References CMD_ER_NR, struct_command::command_nr, struct_command::data, FSPDEBUG, MAX_QUERY_LENGTH, struct_command::param, query(), ret_command, RKFS_BLOCKSIZE, RKFS_DEF_QUERY_OK, and rkfs_inode_truncate().

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Variable Documentation

struct file_operations rkfs_fops

Initial value:

 {
        open: rkfs_file_open,
        read: rkfs_file_read,
        readdir: rkfs_file_readdir,
        write: rkfs_file_write,
        release: rkfs_file_release,
        fsync: simple_sync_file,
        llseek: rkfs_file_llseek
}

file operations structure

Definition at line 42 of file fs_file.c.

Referenced by rkfs_inode_create(), and rkfs_super_read_inode().

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