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Linux/fs/efs/symlink.c

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  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 #include <linux/pagemap.h>
 11 #include <linux/buffer_head.h>
 12 #include "efs.h"
 13 
 14 static int efs_symlink_readpage(struct file *file, struct page *page)
 15 {
 16         char *link = page_address(page);
 17         struct buffer_head * bh;
 18         struct inode * inode = page->mapping->host;
 19         efs_block_t size = inode->i_size;
 20         int err;
 21   
 22         err = -ENAMETOOLONG;
 23         if (size > 2 * EFS_BLOCKSIZE)
 24                 goto fail;
 25   
 26         /* read first 512 bytes of link target */
 27         err = -EIO;
 28         bh = sb_bread(inode->i_sb, efs_bmap(inode, 0));
 29         if (!bh)
 30                 goto fail;
 31         memcpy(link, bh->b_data, (size > EFS_BLOCKSIZE) ? EFS_BLOCKSIZE : size);
 32         brelse(bh);
 33         if (size > EFS_BLOCKSIZE) {
 34                 bh = sb_bread(inode->i_sb, efs_bmap(inode, 1));
 35                 if (!bh)
 36                         goto fail;
 37                 memcpy(link + EFS_BLOCKSIZE, bh->b_data, size - EFS_BLOCKSIZE);
 38                 brelse(bh);
 39         }
 40         link[size] = '\0';
 41         SetPageUptodate(page);
 42         unlock_page(page);
 43         return 0;
 44 fail:
 45         SetPageError(page);
 46         unlock_page(page);
 47         return err;
 48 }
 49 
 50 const struct address_space_operations efs_symlink_aops = {
 51         .readpage       = efs_symlink_readpage
 52 };
 53 

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