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 i, j; 20 char c; 21 char lc; 22 23 pr_debug("follow_link(ino=%lu)\n", inode->i_ino); 24 25 bh = affs_bread(inode->i_sb, inode->i_ino); 26 if (!bh) 27 goto fail; 28 i = 0; 29 j = 0; 30 lf = (struct slink_front *)bh->b_data; 31 lc = 0; 32 33 if (strchr(lf->symname,':')) { /* Handle assign or volume name */ 34 struct affs_sb_info *sbi = AFFS_SB(inode->i_sb); 35 char *pf; 36 spin_lock(&sbi->symlink_lock); 37 pf = sbi->s_prefix ? sbi->s_prefix : "/"; 38 while (i < 1023 && (c = pf[i])) 39 link[i++] = c; 40 spin_unlock(&sbi->symlink_lock); 41 while (i < 1023 && lf->symname[j] != ':') 42 link[i++] = lf->symname[j++]; 43 if (i < 1023) 44 link[i++] = '/'; 45 j++; 46 lc = '/'; 47 } 48 while (i < 1023 && (c = lf->symname[j])) { 49 if (c == '/' && lc == '/' && i < 1020) { /* parent dir */ 50 link[i++] = '.'; 51 link[i++] = '.'; 52 } 53 link[i++] = c; 54 lc = c; 55 j++; 56 } 57 link[i] = '\0'; 58 affs_brelse(bh); 59 SetPageUptodate(page); 60 kunmap(page); 61 unlock_page(page); 62 return 0; 63 fail: 64 SetPageError(page); 65 kunmap(page); 66 unlock_page(page); 67 return -EIO; 68 } 69 70 const struct address_space_operations affs_symlink_aops = { 71 .readpage = affs_symlink_readpage, 72 }; 73 74 const struct inode_operations affs_symlink_inode_operations = { 75 .readlink = generic_readlink, 76 .follow_link = page_follow_link_light, 77 .put_link = page_put_link, 78 .setattr = affs_notify_change, 79 }; 80