[PATCH] OCFS2: The Second Oracle Cluster Filesystem
The OCFS2 file system module.
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>
diff --git a/fs/ocfs2/symlink.c b/fs/ocfs2/symlink.c
new file mode 100644
index 0000000..f6986bd
--- /dev/null
+++ b/fs/ocfs2/symlink.c
@@ -0,0 +1,180 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * linux/cluster/ssi/cfs/symlink.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE
+ * or NON INFRINGEMENT. See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Questions/Comments/Bugfixes to ssic-linux-devel@lists.sourceforge.net
+ *
+ * Copyright (C) 1992 Rick Sladkey
+ *
+ * Optimization changes Copyright (C) 1994 Florian La Roche
+ *
+ * Jun 7 1999, cache symlink lookups in the page cache. -DaveM
+ *
+ * Portions Copyright (C) 2001 Compaq Computer Corporation
+ *
+ * ocfs2 symlink handling code.
+ *
+ * Copyright (C) 2004, 2005 Oracle.
+ *
+ */
+
+#include <linux/fs.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/pagemap.h>
+#include <linux/utsname.h>
+
+#define MLOG_MASK_PREFIX ML_NAMEI
+#include <cluster/masklog.h>
+
+#include "ocfs2.h"
+
+#include "alloc.h"
+#include "file.h"
+#include "inode.h"
+#include "journal.h"
+#include "symlink.h"
+
+#include "buffer_head_io.h"
+
+static char *ocfs2_page_getlink(struct dentry * dentry,
+ struct page **ppage);
+static char *ocfs2_fast_symlink_getlink(struct inode *inode,
+ struct buffer_head **bh);
+
+/* get the link contents into pagecache */
+static char *ocfs2_page_getlink(struct dentry * dentry,
+ struct page **ppage)
+{
+ struct page * page;
+ struct address_space *mapping = dentry->d_inode->i_mapping;
+ page = read_cache_page(mapping, 0,
+ (filler_t *)mapping->a_ops->readpage, NULL);
+ if (IS_ERR(page))
+ goto sync_fail;
+ wait_on_page_locked(page);
+ if (!PageUptodate(page))
+ goto async_fail;
+ *ppage = page;
+ return kmap(page);
+
+async_fail:
+ page_cache_release(page);
+ return ERR_PTR(-EIO);
+
+sync_fail:
+ return (char*)page;
+}
+
+static char *ocfs2_fast_symlink_getlink(struct inode *inode,
+ struct buffer_head **bh)
+{
+ int status;
+ char *link = NULL;
+ struct ocfs2_dinode *fe;
+
+ mlog_entry_void();
+
+ status = ocfs2_read_block(OCFS2_SB(inode->i_sb),
+ OCFS2_I(inode)->ip_blkno,
+ bh,
+ OCFS2_BH_CACHED,
+ inode);
+ if (status < 0) {
+ mlog_errno(status);
+ link = ERR_PTR(status);
+ goto bail;
+ }
+
+ fe = (struct ocfs2_dinode *) (*bh)->b_data;
+ link = (char *) fe->id2.i_symlink;
+bail:
+ mlog_exit(status);
+
+ return link;
+}
+
+static int ocfs2_readlink(struct dentry *dentry,
+ char __user *buffer,
+ int buflen)
+{
+ int ret;
+ char *link;
+ struct buffer_head *bh = NULL;
+ struct inode *inode = dentry->d_inode;
+
+ mlog_entry_void();
+
+ link = ocfs2_fast_symlink_getlink(inode, &bh);
+ if (IS_ERR(link)) {
+ ret = PTR_ERR(link);
+ goto out;
+ }
+
+ ret = vfs_readlink(dentry, buffer, buflen, link);
+
+ brelse(bh);
+out:
+ mlog_exit(ret);
+ return ret;
+}
+
+static void *ocfs2_follow_link(struct dentry *dentry,
+ struct nameidata *nd)
+{
+ int status;
+ char *link;
+ struct inode *inode = dentry->d_inode;
+ struct page *page = NULL;
+ struct buffer_head *bh = NULL;
+
+ if (ocfs2_inode_is_fast_symlink(inode))
+ link = ocfs2_fast_symlink_getlink(inode, &bh);
+ else
+ link = ocfs2_page_getlink(dentry, &page);
+ if (IS_ERR(link)) {
+ status = PTR_ERR(link);
+ mlog_errno(status);
+ goto bail;
+ }
+
+ status = vfs_follow_link(nd, link);
+ if (status)
+ mlog_errno(status);
+bail:
+ if (page) {
+ kunmap(page);
+ page_cache_release(page);
+ }
+ if (bh)
+ brelse(bh);
+
+ return ERR_PTR(status);
+}
+
+struct inode_operations ocfs2_symlink_inode_operations = {
+ .readlink = page_readlink,
+ .follow_link = ocfs2_follow_link,
+ .getattr = ocfs2_getattr,
+};
+struct inode_operations ocfs2_fast_symlink_inode_operations = {
+ .readlink = ocfs2_readlink,
+ .follow_link = ocfs2_follow_link,
+ .getattr = ocfs2_getattr,
+};