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/efs_fs.h>
   11 #include <linux/pagemap.h>
   12 #include <linux/smp_lock.h>
   13 
   14 static int efs_symlink_readpage(struct file *file, struct page *page)
   15 {
   16         char *link = kmap(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         lock_kernel();
   27         /* read first 512 bytes of link target */
   28         err = -EIO;
   29         bh = sb_bread(inode->i_sb, efs_bmap(inode, 0));
   30         if (!bh)
   31                 goto fail;
   32         memcpy(link, bh->b_data, (size > EFS_BLOCKSIZE) ? EFS_BLOCKSIZE : size);
   33         brelse(bh);
   34         if (size > EFS_BLOCKSIZE) {
   35                 bh = sb_bread(inode->i_sb, efs_bmap(inode, 1));
   36                 if (!bh)
   37                         goto fail;
   38                 memcpy(link + EFS_BLOCKSIZE, bh->b_data, size - EFS_BLOCKSIZE);
   39                 brelse(bh);
   40         }
   41         link[size] = '\0';
   42         unlock_kernel();
   43         SetPageUptodate(page);
   44         kunmap(page);
   45         UnlockPage(page);
   46         return 0;
   47 fail:
   48         unlock_kernel();
   49         SetPageError(page);
   50         kunmap(page);
   51         UnlockPage(page);
   52         return err;
   53 }
   54 
   55 struct address_space_operations efs_symlink_aops = {
   56         readpage:       efs_symlink_readpage
   57 };

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FreeBSD/Linux Kernel Cross Reference sys/fs/efs/symlink.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/efs/symlink.c