1 /* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * linux/cluster/ssi/cfs/symlink.c 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation; either version 2 of 9 * the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE 14 * or NON INFRINGEMENT. See the GNU General Public License for more 15 * details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 * 21 * Questions/Comments/Bugfixes to ssic-linux-devel@lists.sourceforge.net 22 * 23 * Copyright (C) 1992 Rick Sladkey 24 * 25 * Optimization changes Copyright (C) 1994 Florian La Roche 26 * 27 * Jun 7 1999, cache symlink lookups in the page cache. -DaveM 28 * 29 * Portions Copyright (C) 2001 Compaq Computer Corporation 30 * 31 * ocfs2 symlink handling code. 32 * 33 * Copyright (C) 2004, 2005 Oracle. 34 * 35 */ 36 37 #include <linux/fs.h> 38 #include <linux/types.h> 39 #include <linux/slab.h> 40 #include <linux/pagemap.h> 41 #include <linux/namei.h> 42 43 #include <cluster/masklog.h> 44 45 #include "ocfs2.h" 46 47 #include "alloc.h" 48 #include "file.h" 49 #include "inode.h" 50 #include "journal.h" 51 #include "symlink.h" 52 #include "xattr.h" 53 54 #include "buffer_head_io.h" 55 56 57 static int ocfs2_fast_symlink_readpage(struct file *unused, struct page *page) 58 { 59 struct inode *inode = page->mapping->host; 60 struct buffer_head *bh = NULL; 61 int status = ocfs2_read_inode_block(inode, &bh); 62 struct ocfs2_dinode *fe; 63 const char *link; 64 void *kaddr; 65 size_t len; 66 67 if (status < 0) { 68 mlog_errno(status); 69 return status; 70 } 71 72 fe = (struct ocfs2_dinode *) bh->b_data; 73 link = (char *) fe->id2.i_symlink; 74 /* will be less than a page size */ 75 len = strnlen(link, ocfs2_fast_symlink_chars(inode->i_sb)); 76 kaddr = kmap_atomic(page); 77 memcpy(kaddr, link, len + 1); 78 kunmap_atomic(kaddr); 79 SetPageUptodate(page); 80 unlock_page(page); 81 brelse(bh); 82 return 0; 83 } 84 85 const struct address_space_operations ocfs2_fast_symlink_aops = { 86 .readpage = ocfs2_fast_symlink_readpage, 87 }; 88 89 const struct inode_operations ocfs2_symlink_inode_operations = { 90 .readlink = generic_readlink, 91 .follow_link = page_follow_link_light, 92 .put_link = page_put_link, 93 .getattr = ocfs2_getattr, 94 .setattr = ocfs2_setattr, 95 .setxattr = generic_setxattr, 96 .getxattr = generic_getxattr, 97 .listxattr = ocfs2_listxattr, 98 .removexattr = generic_removexattr, 99 .fiemap = ocfs2_fiemap, 100 }; 101