]> git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blame - fs/efs/symlink.c
Merge tag 'pxa-for-4.7' of https://github.com/rjarzmik/linux into fixes
[mirror_ubuntu-zesty-kernel.git] / 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>
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10#include <linux/pagemap.h>
11#include <linux/buffer_head.h>
45254b4f 12#include "efs.h"
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13
14static int efs_symlink_readpage(struct file *file, struct page *page)
15{
21fc61c7 16 char *link = page_address(page);
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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)
e7ec952f 24 goto fail;
1da177e4 25
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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';
1da177e4 41 SetPageUptodate(page);
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42 unlock_page(page);
43 return 0;
44fail:
1da177e4 45 SetPageError(page);
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46 unlock_page(page);
47 return err;
48}
49
f5e54d6e 50const struct address_space_operations efs_symlink_aops = {
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51 .readpage = efs_symlink_readpage
52};