1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/fs/affs/symlink.c 4 * 5 * 1995 Hans-Joachim Widmaier - Modified for affs. 6 * 7 * Copyright (C) 1991, 1992 Linus Torvalds 8 * 9 * affs symlink handling code 10 */ 11 12 #include "affs.h" 13 14 static int affs_symlink_read_folio(struct file *file, struct folio *folio) 15 { 16 struct page *page = &folio->page; 17 struct buffer_head *bh; 18 struct inode *inode = page->mapping->host; 19 char *link = page_address(page); 20 struct slink_front *lf; 21 int i, j; 22 char c; 23 char lc; 24 25 pr_debug("get_link(ino=%lu)\n", inode->i_ino); 26 27 bh = affs_bread(inode->i_sb, inode->i_ino); 28 if (!bh) 29 goto fail; 30 i = 0; 31 j = 0; 32 lf = (struct slink_front *)bh->b_data; 33 lc = 0; 34 35 if (strchr(lf->symname,':')) { /* Handle assign or volume name */ 36 struct affs_sb_info *sbi = AFFS_SB(inode->i_sb); 37 char *pf; 38 spin_lock(&sbi->symlink_lock); 39 pf = sbi->s_prefix ? sbi->s_prefix : "/"; 40 while (i < 1023 && (c = pf[i])) 41 link[i++] = c; 42 spin_unlock(&sbi->symlink_lock); 43 while (i < 1023 && lf->symname[j] != ':') 44 link[i++] = lf->symname[j++]; 45 if (i < 1023) 46 link[i++] = '/'; 47 j++; 48 lc = '/'; 49 } 50 while (i < 1023 && (c = lf->symname[j])) { 51 if (c == '/' && lc == '/' && i < 1020) { /* parent dir */ 52 link[i++] = '.'; 53 link[i++] = '.'; 54 } 55 link[i++] = c; 56 lc = c; 57 j++; 58 } 59 link[i] = '\0'; 60 affs_brelse(bh); 61 SetPageUptodate(page); 62 unlock_page(page); 63 return 0; 64 fail: 65 SetPageError(page); 66 unlock_page(page); 67 return -EIO; 68 } 69 70 const struct address_space_operations affs_symlink_aops = { 71 .read_folio = affs_symlink_read_folio, 72 }; 73 74 const struct inode_operations affs_symlink_inode_operations = { 75 .get_link = page_get_link, 76 .setattr = affs_notify_change, 77 }; 78