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-rw-r--r--fs/libfs.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/fs/libfs.c b/fs/libfs.c
index 892d41cb3382..baeb71ee1cde 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -512,6 +512,20 @@ void simple_release_fs(struct vfsmount **mount, int *count)
512 mntput(mnt); 512 mntput(mnt);
513} 513}
514 514
515/**
516 * simple_read_from_buffer - copy data from the buffer to user space
517 * @to: the user space buffer to read to
518 * @count: the maximum number of bytes to read
519 * @ppos: the current position in the buffer
520 * @from: the buffer to read from
521 * @available: the size of the buffer
522 *
523 * The simple_read_from_buffer() function reads up to @count bytes from the
524 * buffer @from at offset @ppos into the user space address starting at @to.
525 *
526 * On success, the number of bytes read is returned and the offset @ppos is
527 * advanced by this number, or negative value is returned on error.
528 **/
515ssize_t simple_read_from_buffer(void __user *to, size_t count, loff_t *ppos, 529ssize_t simple_read_from_buffer(void __user *to, size_t count, loff_t *ppos,
516 const void *from, size_t available) 530 const void *from, size_t available)
517{ 531{
@@ -528,6 +542,20 @@ ssize_t simple_read_from_buffer(void __user *to, size_t count, loff_t *ppos,
528 return count; 542 return count;
529} 543}
530 544
545/**
546 * memory_read_from_buffer - copy data from the buffer
547 * @to: the kernel space buffer to read to
548 * @count: the maximum number of bytes to read
549 * @ppos: the current position in the buffer
550 * @from: the buffer to read from
551 * @available: the size of the buffer
552 *
553 * The memory_read_from_buffer() function reads up to @count bytes from the
554 * buffer @from at offset @ppos into the kernel space address starting at @to.
555 *
556 * On success, the number of bytes read is returned and the offset @ppos is
557 * advanced by this number, or negative value is returned on error.
558 **/
531ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos, 559ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos,
532 const void *from, size_t available) 560 const void *from, size_t available)
533{ 561{