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 24 pr_debug("follow_link(ino=%lu)\n", inode->i_ino); 25 26 err = -EIO; 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 kunmap(page); 63 unlock_page(page); 64 return 0; 65 fail: 66 SetPageError(page); 67 kunmap(page); 68 unlock_page(page); 69 return err; 70 } 71 72 const struct address_space_operations affs_symlink_aops = { 73 .readpage = affs_symlink_readpage, 74 }; 75 76 const struct inode_operations affs_symlink_inode_operations = { 77 .readlink = generic_readlink, 78 .follow_link = page_follow_link_light, 79 .put_link = page_put_link, 80 .setattr = affs_notify_change, 81 }; 82