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https://github.com/edk2-porting/linux-next.git
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ea022dfb3c
seeing that "fast" symlinks still get allocation + copy, we might as well simply switch them to pagecache-based variant of ->follow_link(); just need an appropriate ->readpage() for them... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
101 lines
2.7 KiB
C
101 lines
2.7 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* linux/cluster/ssi/cfs/symlink.c
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE
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* or NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Questions/Comments/Bugfixes to ssic-linux-devel@lists.sourceforge.net
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*
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* Copyright (C) 1992 Rick Sladkey
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*
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* Optimization changes Copyright (C) 1994 Florian La Roche
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*
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* Jun 7 1999, cache symlink lookups in the page cache. -DaveM
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*
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* Portions Copyright (C) 2001 Compaq Computer Corporation
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*
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* ocfs2 symlink handling code.
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*
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* Copyright (C) 2004, 2005 Oracle.
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*
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*/
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/pagemap.h>
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#include <linux/namei.h>
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "alloc.h"
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#include "file.h"
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#include "inode.h"
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#include "journal.h"
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#include "symlink.h"
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#include "xattr.h"
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#include "buffer_head_io.h"
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static int ocfs2_fast_symlink_readpage(struct file *unused, struct page *page)
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{
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struct inode *inode = page->mapping->host;
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struct buffer_head *bh;
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int status = ocfs2_read_inode_block(inode, &bh);
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struct ocfs2_dinode *fe;
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const char *link;
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void *kaddr;
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size_t len;
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if (status < 0) {
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mlog_errno(status);
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return status;
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}
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fe = (struct ocfs2_dinode *) bh->b_data;
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link = (char *) fe->id2.i_symlink;
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/* will be less than a page size */
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len = strnlen(link, ocfs2_fast_symlink_chars(inode->i_sb));
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kaddr = kmap_atomic(page);
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memcpy(kaddr, link, len + 1);
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kunmap_atomic(kaddr);
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SetPageUptodate(page);
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unlock_page(page);
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brelse(bh);
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return 0;
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}
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const struct address_space_operations ocfs2_fast_symlink_aops = {
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.readpage = ocfs2_fast_symlink_readpage,
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};
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const struct inode_operations ocfs2_symlink_inode_operations = {
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.readlink = generic_readlink,
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.follow_link = page_follow_link_light,
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.put_link = page_put_link,
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.getattr = ocfs2_getattr,
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.setattr = ocfs2_setattr,
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.setxattr = generic_setxattr,
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.getxattr = generic_getxattr,
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.listxattr = ocfs2_listxattr,
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.removexattr = generic_removexattr,
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.fiemap = ocfs2_fiemap,
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};
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