fs/efs/symlink.c

   1 /*
   2  * symlink.c
   3  *
   4  * Copyright (c) 1999 Al Smith
   5  *
   6  * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
   7  */
   8
   9 #include <linux/string.h>
  10 <<<<<<< HEAD:fs/efs/symlink.c
  11 #include <linux/efs_fs.h>
  12 =======
  13 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:fs/efs/symlink.c
  14 #include <linux/pagemap.h>
  15 #include <linux/buffer_head.h>
  16 #include <linux/smp_lock.h>
  17 <<<<<<< HEAD:fs/efs/symlink.c
  18 =======
  19 #include "efs.h"
  20 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:fs/efs/symlink.c
  21
  22 static int efs_symlink_readpage(struct file *file, struct page *page)
  23 {
  24         char *link = kmap(page);
  25         struct buffer_head * bh;
  26         struct inode * inode = page->mapping->host;
  27         efs_block_t size = inode->i_size;
  28         int err;
  29
  30         err = -ENAMETOOLONG;
  31         if (size > 2 * EFS_BLOCKSIZE)
  32                 goto fail_notlocked;
  33
  34         lock_kernel();
  35         /* read first 512 bytes of link target */
  36         err = -EIO;
  37         bh = sb_bread(inode->i_sb, efs_bmap(inode, 0));
  38         if (!bh)
  39                 goto fail;
  40         memcpy(link, bh->b_data, (size > EFS_BLOCKSIZE) ? EFS_BLOCKSIZE : size);
  41         brelse(bh);
  42         if (size > EFS_BLOCKSIZE) {
  43                 bh = sb_bread(inode->i_sb, efs_bmap(inode, 1));
  44                 if (!bh)
  45                         goto fail;
  46                 memcpy(link + EFS_BLOCKSIZE, bh->b_data, size - EFS_BLOCKSIZE);
  47                 brelse(bh);
  48         }
  49         link[size] = '\0';
  50         unlock_kernel();
  51         SetPageUptodate(page);
  52         kunmap(page);
  53         unlock_page(page);
  54         return 0;
  55 fail:
  56         unlock_kernel();
  57 fail_notlocked:
  58         SetPageError(page);
  59         kunmap(page);
  60         unlock_page(page);
  61         return err;
  62 }
  63
  64 const struct address_space_operations efs_symlink_aops = {
  65         .readpage       = efs_symlink_readpage
  66 };