VisionFive2 Linux kernel

b24413180f560 (Greg Kroah-Hartman 2017-11-01 15:07:57 +0100  1) // SPDX-License-Identifier: GPL-2.0
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  2) /*
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  3)  *  linux/fs/affs/symlink.c
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  4)  *
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  5)  *  1995  Hans-Joachim Widmaier - Modified for affs.
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  6)  *
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  7)  *  Copyright (C) 1991, 1992  Linus Torvalds
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  8)  *
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  9)  *  affs symlink handling code
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 10)  */
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 11) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 12) #include "affs.h"
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 13) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 14) static int affs_symlink_readpage(struct file *file, struct page *page)
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 15) {
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 16) 	struct buffer_head *bh;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 17) 	struct inode *inode = page->mapping->host;
21fc61c73c390 (Al Viro            2015-11-17 01:07:57 -0500 18) 	char *link = page_address(page);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 19) 	struct slink_front *lf;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 20) 	int			 i, j;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 21) 	char			 c;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 22) 	char			 lc;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 23) 
6b2553918d8b4 (Al Viro            2015-11-17 10:20:54 -0500 24) 	pr_debug("get_link(ino=%lu)\n", inode->i_ino);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 25) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 26) 	bh = affs_bread(inode->i_sb, inode->i_ino);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 27) 	if (!bh)
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 28) 		goto fail;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 29) 	i  = 0;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 30) 	j  = 0;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 31) 	lf = (struct slink_front *)bh->b_data;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 32) 	lc = 0;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 33) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 34) 	if (strchr(lf->symname,':')) {	/* Handle assign or volume name */
29333920a5a46 (Al Viro            2010-01-24 00:04:07 -0500 35) 		struct affs_sb_info *sbi = AFFS_SB(inode->i_sb);
29333920a5a46 (Al Viro            2010-01-24 00:04:07 -0500 36) 		char *pf;
29333920a5a46 (Al Viro            2010-01-24 00:04:07 -0500 37) 		spin_lock(&sbi->symlink_lock);
29333920a5a46 (Al Viro            2010-01-24 00:04:07 -0500 38) 		pf = sbi->s_prefix ? sbi->s_prefix : "/";
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 39) 		while (i < 1023 && (c = pf[i]))
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 40) 			link[i++] = c;
29333920a5a46 (Al Viro            2010-01-24 00:04:07 -0500 41) 		spin_unlock(&sbi->symlink_lock);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 42) 		while (i < 1023 && lf->symname[j] != ':')
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 43) 			link[i++] = lf->symname[j++];
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 44) 		if (i < 1023)
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 45) 			link[i++] = '/';
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 46) 		j++;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 47) 		lc = '/';
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 48) 	}
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 49) 	while (i < 1023 && (c = lf->symname[j])) {
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 50) 		if (c == '/' && lc == '/' && i < 1020) {	/* parent dir */
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 51) 			link[i++] = '.';
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 52) 			link[i++] = '.';
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 53) 		}
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 54) 		link[i++] = c;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 55) 		lc = c;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 56) 		j++;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 57) 	}
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 58) 	link[i] = '\0';
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 59) 	affs_brelse(bh);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 60) 	SetPageUptodate(page);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 61) 	unlock_page(page);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 62) 	return 0;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 63) fail:
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 64) 	SetPageError(page);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 65) 	unlock_page(page);
196a4f82bddb2 (Fabian Frederick   2015-06-30 14:58:01 -0700 66) 	return -EIO;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 67) }
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 68) 
f5e54d6e53a20 (Christoph Hellwig  2006-06-28 04:26:44 -0700 69) const struct address_space_operations affs_symlink_aops = {
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 70) 	.readpage	= affs_symlink_readpage,
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 71) };
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 72) 
754661f143e70 (Arjan van de Ven   2007-02-12 00:55:38 -0800 73) const struct inode_operations affs_symlink_inode_operations = {
6b2553918d8b4 (Al Viro            2015-11-17 10:20:54 -0500 74) 	.get_link	= page_get_link,
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 75) 	.setattr	= affs_notify_change,
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 76) };