Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *  linux/fs/ext4/symlink.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Only fast symlinks left here - the rest is done by generic code. AV, 1999
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * Copyright (C) 1992, 1993, 1994, 1995
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * Remy Card (card@masi.ibp.fr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * Laboratoire MASI - Institut Blaise Pascal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * Universite Pierre et Marie Curie (Paris VI)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  *  from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  *  linux/fs/minix/symlink.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  *  Copyright (C) 1991, 1992  Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  *  ext4 symlink handling code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/namei.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include "ext4.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include "xattr.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static const char *ext4_encrypted_get_link(struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 					   struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 					   struct delayed_call *done)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	struct page *cpage = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	const void *caddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	unsigned int max_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	const char *paddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	if (!dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		return ERR_PTR(-ECHILD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	if (ext4_inode_is_fast_symlink(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		caddr = EXT4_I(inode)->i_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		max_size = sizeof(EXT4_I(inode)->i_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 		cpage = read_mapping_page(inode->i_mapping, 0, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 		if (IS_ERR(cpage))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 			return ERR_CAST(cpage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 		caddr = page_address(cpage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 		max_size = inode->i_sb->s_blocksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	paddr = fscrypt_get_symlink(inode, caddr, max_size, done);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	if (cpage)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 		put_page(cpage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	return paddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static int ext4_encrypted_symlink_getattr(const struct path *path,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 					  struct kstat *stat, u32 request_mask,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 					  unsigned int query_flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	ext4_getattr(path, stat, request_mask, query_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	return fscrypt_symlink_getattr(path, stat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) const struct inode_operations ext4_encrypted_symlink_inode_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	.get_link	= ext4_encrypted_get_link,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	.setattr	= ext4_setattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	.getattr	= ext4_encrypted_symlink_getattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	.listxattr	= ext4_listxattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) const struct inode_operations ext4_symlink_inode_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	.get_link	= page_get_link,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 	.setattr	= ext4_setattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	.getattr	= ext4_getattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	.listxattr	= ext4_listxattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) const struct inode_operations ext4_fast_symlink_inode_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 	.get_link	= simple_get_link,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 	.setattr	= ext4_setattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 	.getattr	= ext4_getattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) 	.listxattr	= ext4_listxattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) };