diff options
Diffstat (limited to 'fs/ocfs2/symlink.c')
| -rw-r--r-- | fs/ocfs2/symlink.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/fs/ocfs2/symlink.c b/fs/ocfs2/symlink.c new file mode 100644 index 00000000000..f6986bd79e7 --- /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, +}; |