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 buffer_head *bh; 17 struct inode *inode = folio->mapping->host; 18 char *link = folio_address(folio); 19 struct slink_front *lf; 20 int i, j; 21 char c; 22 char lc; 23 24 pr_debug("get_link(ino=%lu)\n", inode->i_ino); 25 26 bh = affs_bread(inode->i_sb, inode->i_ino); 27 if (!bh) 28 goto fail; 29 i = 0; 30 j = 0; 31 lf = (struct slink_front *)bh->b_data; 32 lc = 0; 33 34 if (strchr(lf->symname,':')) { /* Handle assign or volume name */ 35 struct affs_sb_info *sbi = AFFS_SB(inode->i_sb); 36 char *pf; 37 spin_lock(&sbi->symlink_lock); 38 pf = sbi->s_prefix ? sbi->s_prefix : "/"; 39 while (i < 1023 && (c = pf[i])) 40 link[i++] = c; 41 spin_unlock(&sbi->symlink_lock); 42 while (i < 1023 && lf->symname[j] != ':') 43 link[i++] = lf->symname[j++]; 44 if (i < 1023) 45 link[i++] = '/'; 46 j++; 47 lc = '/'; 48 } 49 while (i < 1023 && (c = lf->symname[j])) { 50 if (c == '/' && lc == '/' && i < 1020) { /* parent dir */ 51 link[i++] = '.'; 52 link[i++] = '.'; 53 } 54 link[i++] = c; 55 lc = c; 56 j++; 57 } 58 link[i] = '\0'; 59 affs_brelse(bh); 60 folio_mark_uptodate(folio); 61 folio_unlock(folio); 62 return 0; 63 fail: 64 folio_unlock(folio); 65 return -EIO; 66 } 67 68 const struct address_space_operations affs_symlink_aops = { 69 .read_folio = affs_symlink_read_folio, 70 }; 71 72 const struct inode_operations affs_symlink_inode_operations = { 73 .get_link = page_get_link, 74 .setattr = affs_notify_change, 75 }; 76