fs/ocfs2/symlink.c

   1 /*
   2  *  linux/cluster/ssi/cfs/symlink.c
   3  *
   4  *      This program is free software; you can redistribute it and/or
   5  *      modify it under the terms of the GNU General Public License as
   6  *      published by the Free Software Foundation; either version 2 of
   7  *      the License, or (at your option) any later version.
   8  *
   9  *      This program is distributed in the hope that it will be useful,
  10  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *      MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE
  12  *      or NON INFRINGEMENT.  See the GNU General Public License for more
  13  *      details.
  14  *
  15  *      You should have received a copy of the GNU General Public License
  16  *      along with this program; if not, write to the Free Software
  17  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  *
  19  *      Questions/Comments/Bugfixes to ssic-linux-devel@lists.sourceforge.net
  20  *
  21  *  Copyright (C) 1992  Rick Sladkey
  22  *
  23  *  Optimization changes Copyright (C) 1994 Florian La Roche
  24  *
  25  *  Jun 7 1999, cache symlink lookups in the page cache.  -DaveM
  26  *
  27  *  Portions Copyright (C) 2001 Compaq Computer Corporation
  28  *
  29  *  ocfs2 symlink handling code.
  30  *
  31  *  Copyright (C) 2004, 2005 Oracle.
  32  *
  33  */
  34
  35 #include <linux/fs.h>
  36 #include <linux/types.h>
  37 #include <linux/slab.h>
  38 #include <linux/pagemap.h>
  39 #include <linux/namei.h>
  40
  41 #include <cluster/masklog.h>
  42
  43 #include "ocfs2.h"
  44
  45 #include "alloc.h"
  46 #include "file.h"
  47 #include "inode.h"
  48 #include "journal.h"
  49 #include "symlink.h"
  50 #include "xattr.h"
  51
  52 #include "buffer_head_io.h"
  53
  54
  55 static int ocfs2_fast_symlink_read_folio(struct file *f, struct folio *folio)
  56 {
  57         struct page *page = &folio->page;
  58         struct inode *inode = page->mapping->host;
  59         struct buffer_head *bh = NULL;
  60         int status = ocfs2_read_inode_block(inode, &bh);
  61         struct ocfs2_dinode *fe;
  62         const char *link;
  63         void *kaddr;
  64         size_t len;
  65
  66         if (status < 0) {
  67                 mlog_errno(status);
  68                 return status;
  69         }
  70
  71         fe = (struct ocfs2_dinode *) bh->b_data;
  72         link = (char *) fe->id2.i_symlink;
  73         /* will be less than a page size */
  74         len = strnlen(link, ocfs2_fast_symlink_chars(inode->i_sb));
  75         kaddr = kmap_atomic(page);
  76         memcpy(kaddr, link, len + 1);
  77         kunmap_atomic(kaddr);
  78         SetPageUptodate(page);
  79         unlock_page(page);
  80         brelse(bh);
  81         return 0;
  82 }
  83
  84 const struct address_space_operations ocfs2_fast_symlink_aops = {
  85         .read_folio             = ocfs2_fast_symlink_read_folio,
  86 };
  87
  88 const struct inode_operations ocfs2_symlink_inode_operations = {
  89         .get_link       = page_get_link,
  90         .getattr        = ocfs2_getattr,
  91         .setattr        = ocfs2_setattr,
  92         .listxattr      = ocfs2_listxattr,
  93         .fiemap         = ocfs2_fiemap,
  94 };