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Commit 1bf9d14d authored by Al Viro's avatar Al Viro
Browse files

new helper: fixed_size_llseek() 



Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 0747fdb2

fs/read_write.c

+20 −0
Original line number Diff line number Diff line
@@ -144,6 +144,26 @@ loff_t generic_file_llseek(struct file *file, loff_t offset, int whence) 
}

EXPORT_SYMBOL(generic_file_llseek);



/**

 * fixed_size_llseek - llseek implementation for fixed-sized devices

 * @file:	file structure to seek on

 * @offset:	file offset to seek to

 * @whence:	type of seek

 * @size:	size of the file

 *

 */

loff_t fixed_size_llseek(struct file *file, loff_t offset, int whence, loff_t size)

{

	switch (whence) {

	case SEEK_SET: case SEEK_CUR: case SEEK_END:

		return generic_file_llseek_size(file, offset, whence,

						size, size);

	default:

		return -EINVAL;

	}

}

EXPORT_SYMBOL(fixed_size_llseek);



/**

 * noop_llseek - No Operation Performed llseek implementation

 * @file:	file structure to seek on

include/linux/fs.h

+2 −0
Original line number Diff line number Diff line
@@ -2428,6 +2428,8 @@ extern loff_t no_llseek(struct file *file, loff_t offset, int whence); 
extern loff_t generic_file_llseek(struct file *file, loff_t offset, int whence);

extern loff_t generic_file_llseek_size(struct file *file, loff_t offset,

		int whence, loff_t maxsize, loff_t eof);

extern loff_t fixed_size_llseek(struct file *file, loff_t offset,

		int whence, loff_t size);

extern int generic_file_open(struct inode * inode, struct file * filp);

extern int nonseekable_open(struct inode * inode, struct file * filp);