1 /* 2 * linux/fs/affs/symlink.c 3 * 4 * 1995 Hans-Joachim Widmaier - Modified for affs. 5 * 6 * Copyright (C) 1991, 1992 Linus Torvalds 7 * 8 * affs symlink handling code 9 */ 10 11 #include "affs.h" 12 13 static int affs_symlink_readpage(struct file *file, struct page *page) 14 { 15 struct buffer_head *bh; 16 struct inode *inode = page->mapping->host; 17 char *link = kmap(page); 18 struct slink_front *lf; 19 int err; 20 int i, j; 21 char c; 22 char lc; 23 char *pf; 24 25 pr_debug("AFFS: follow_link(ino=%lu)\n",inode->i_ino); 26 27 err = -EIO; 28 bh = affs_bread(inode->i_sb, inode->i_ino); 29 if (!bh) 30 goto fail; 31 i = 0; 32 j = 0; 33 lf = (struct slink_front *)bh->b_data; 34 lc = 0; 35 pf = AFFS_SB(inode->i_sb)->s_prefix ? AFFS_SB(inode->i_sb)->s_prefix : "/"; 36 37 if (strchr(lf->symname,':')) { /* Handle assign or volume name */ 38 while (i < 1023 && (c = pf[i])) 39 link[i++] = c; 40 while (i < 1023 && lf->symname[j] != ':') 41 link[i++] = lf->symname[j++]; 42 if (i < 1023) 43 link[i++] = '/'; 44 j++; 45 lc = '/'; 46 } 47 while (i < 1023 && (c = lf->symname[j])) { 48 if (c == '/' && lc == '/' && i < 1020) { /* parent dir */ 49 link[i++] = '.'; 50 link[i++] = '.'; 51 } 52 link[i++] = c; 53 lc = c; 54 j++; 55 } 56 link[i] = '\0'; 57 affs_brelse(bh); 58 SetPageUptodate(page); 59 kunmap(page); 60 unlock_page(page); 61 return 0; 62 fail: 63 SetPageError(page); 64 kunmap(page); 65 unlock_page(page); 66 return err; 67 } 68 69 const struct address_space_operations affs_symlink_aops = { 70 .readpage = affs_symlink_readpage, 71 }; 72 73 const struct inode_operations affs_symlink_inode_operations = { 74 .readlink = generic_readlink, 75 .follow_link = page_follow_link_light, 76 .put_link = page_put_link, 77 .setattr = affs_notify_change, 78 }; 79