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53 lines
1.2 KiB
53 lines
1.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* symlink.c |
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* |
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* Copyright (c) 1999 Al Smith |
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* |
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* Portions derived from work (c) 1995,1996 Christian Vogelgsang. |
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*/ |
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#include <linux/string.h> |
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#include <linux/pagemap.h> |
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#include <linux/buffer_head.h> |
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#include "efs.h" |
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static int efs_symlink_readpage(struct file *file, struct page *page) |
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{ |
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char *link = page_address(page); |
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struct buffer_head * bh; |
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struct inode * inode = page->mapping->host; |
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efs_block_t size = inode->i_size; |
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int err; |
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err = -ENAMETOOLONG; |
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if (size > 2 * EFS_BLOCKSIZE) |
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goto fail; |
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/* read first 512 bytes of link target */ |
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err = -EIO; |
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bh = sb_bread(inode->i_sb, efs_bmap(inode, 0)); |
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if (!bh) |
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goto fail; |
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memcpy(link, bh->b_data, (size > EFS_BLOCKSIZE) ? EFS_BLOCKSIZE : size); |
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brelse(bh); |
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if (size > EFS_BLOCKSIZE) { |
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bh = sb_bread(inode->i_sb, efs_bmap(inode, 1)); |
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if (!bh) |
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goto fail; |
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memcpy(link + EFS_BLOCKSIZE, bh->b_data, size - EFS_BLOCKSIZE); |
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brelse(bh); |
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} |
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link[size] = '\0'; |
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SetPageUptodate(page); |
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unlock_page(page); |
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return 0; |
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fail: |
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SetPageError(page); |
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unlock_page(page); |
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return err; |
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} |
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const struct address_space_operations efs_symlink_aops = { |
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.readpage = efs_symlink_readpage |
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};
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