| 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 | }; |