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