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c959df9f01
v9fs_insert uses v9fs_fid_lookup (which also locks the fid) to get the primary fid associated with the dentry and destroys the v9fs_fid struct after removing the file. If another process called v9fs_fid_lookup on the same dentry, it may wait undefinitely for the fid's lock (as the struct is freed). This patch changes v9fs_remove to use a cloned fid, so the primary fid is not locked and freed. Signed-off-by: Latchesar Ionkov <lucho@ionkov.net> Cc: Eric Van Hensbergen <ericvh@hera.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1357 lines
28 KiB
C
1357 lines
28 KiB
C
/*
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* linux/fs/9p/vfs_inode.c
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*
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* This file contains vfs inode ops for the 9P2000 protocol.
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*
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* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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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. See the
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* GNU General Public License for more 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:
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02111-1301 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/pagemap.h>
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#include <linux/stat.h>
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#include <linux/string.h>
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#include <linux/smp_lock.h>
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#include <linux/inet.h>
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#include <linux/namei.h>
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#include <linux/idr.h>
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#include "debug.h"
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#include "v9fs.h"
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#include "9p.h"
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#include "v9fs_vfs.h"
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#include "fid.h"
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static const struct inode_operations v9fs_dir_inode_operations;
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static const struct inode_operations v9fs_dir_inode_operations_ext;
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static const struct inode_operations v9fs_file_inode_operations;
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static const struct inode_operations v9fs_symlink_inode_operations;
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/**
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* unixmode2p9mode - convert unix mode bits to plan 9
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* @v9ses: v9fs session information
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* @mode: mode to convert
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*
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*/
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static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
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{
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int res;
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res = mode & 0777;
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if (S_ISDIR(mode))
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res |= V9FS_DMDIR;
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if (v9ses->extended) {
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if (S_ISLNK(mode))
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res |= V9FS_DMSYMLINK;
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if (v9ses->nodev == 0) {
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if (S_ISSOCK(mode))
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res |= V9FS_DMSOCKET;
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if (S_ISFIFO(mode))
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res |= V9FS_DMNAMEDPIPE;
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if (S_ISBLK(mode))
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res |= V9FS_DMDEVICE;
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if (S_ISCHR(mode))
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res |= V9FS_DMDEVICE;
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}
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if ((mode & S_ISUID) == S_ISUID)
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res |= V9FS_DMSETUID;
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if ((mode & S_ISGID) == S_ISGID)
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res |= V9FS_DMSETGID;
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if ((mode & V9FS_DMLINK))
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res |= V9FS_DMLINK;
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}
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return res;
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}
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/**
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* p9mode2unixmode- convert plan9 mode bits to unix mode bits
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* @v9ses: v9fs session information
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* @mode: mode to convert
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*
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*/
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static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
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{
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int res;
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res = mode & 0777;
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if ((mode & V9FS_DMDIR) == V9FS_DMDIR)
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res |= S_IFDIR;
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else if ((mode & V9FS_DMSYMLINK) && (v9ses->extended))
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res |= S_IFLNK;
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else if ((mode & V9FS_DMSOCKET) && (v9ses->extended)
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&& (v9ses->nodev == 0))
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res |= S_IFSOCK;
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else if ((mode & V9FS_DMNAMEDPIPE) && (v9ses->extended)
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&& (v9ses->nodev == 0))
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res |= S_IFIFO;
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else if ((mode & V9FS_DMDEVICE) && (v9ses->extended)
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&& (v9ses->nodev == 0))
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res |= S_IFBLK;
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else
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res |= S_IFREG;
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if (v9ses->extended) {
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if ((mode & V9FS_DMSETUID) == V9FS_DMSETUID)
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res |= S_ISUID;
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if ((mode & V9FS_DMSETGID) == V9FS_DMSETGID)
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res |= S_ISGID;
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}
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return res;
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}
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int v9fs_uflags2omode(int uflags)
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{
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int ret;
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ret = 0;
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switch (uflags&3) {
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default:
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case O_RDONLY:
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ret = V9FS_OREAD;
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break;
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case O_WRONLY:
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ret = V9FS_OWRITE;
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break;
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case O_RDWR:
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ret = V9FS_ORDWR;
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break;
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}
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if (uflags & O_EXCL)
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ret |= V9FS_OEXCL;
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if (uflags & O_TRUNC)
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ret |= V9FS_OTRUNC;
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if (uflags & O_APPEND)
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ret |= V9FS_OAPPEND;
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return ret;
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}
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/**
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* v9fs_blank_wstat - helper function to setup a 9P stat structure
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* @v9ses: 9P session info (for determining extended mode)
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* @wstat: structure to initialize
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*
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*/
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static void
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v9fs_blank_wstat(struct v9fs_wstat *wstat)
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{
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wstat->type = ~0;
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wstat->dev = ~0;
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wstat->qid.type = ~0;
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wstat->qid.version = ~0;
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*((long long *)&wstat->qid.path) = ~0;
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wstat->mode = ~0;
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wstat->atime = ~0;
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wstat->mtime = ~0;
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wstat->length = ~0;
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wstat->name = NULL;
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wstat->uid = NULL;
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wstat->gid = NULL;
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wstat->muid = NULL;
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wstat->n_uid = ~0;
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wstat->n_gid = ~0;
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wstat->n_muid = ~0;
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wstat->extension = NULL;
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}
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/**
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* v9fs_get_inode - helper function to setup an inode
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* @sb: superblock
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* @mode: mode to setup inode with
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*
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*/
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struct inode *v9fs_get_inode(struct super_block *sb, int mode)
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{
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struct inode *inode;
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struct v9fs_session_info *v9ses = sb->s_fs_info;
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dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
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inode = new_inode(sb);
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if (inode) {
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inode->i_mode = mode;
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inode->i_uid = current->fsuid;
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inode->i_gid = current->fsgid;
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inode->i_blocks = 0;
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inode->i_rdev = 0;
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inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
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inode->i_mapping->a_ops = &v9fs_addr_operations;
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switch (mode & S_IFMT) {
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case S_IFIFO:
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case S_IFBLK:
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case S_IFCHR:
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case S_IFSOCK:
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if(!v9ses->extended) {
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dprintk(DEBUG_ERROR, "special files without extended mode\n");
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return ERR_PTR(-EINVAL);
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}
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init_special_inode(inode, inode->i_mode,
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inode->i_rdev);
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break;
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case S_IFREG:
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inode->i_op = &v9fs_file_inode_operations;
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inode->i_fop = &v9fs_file_operations;
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break;
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case S_IFLNK:
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if(!v9ses->extended) {
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dprintk(DEBUG_ERROR, "extended modes used w/o 9P2000.u\n");
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return ERR_PTR(-EINVAL);
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}
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inode->i_op = &v9fs_symlink_inode_operations;
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break;
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case S_IFDIR:
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inc_nlink(inode);
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if(v9ses->extended)
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inode->i_op = &v9fs_dir_inode_operations_ext;
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else
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inode->i_op = &v9fs_dir_inode_operations;
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inode->i_fop = &v9fs_dir_operations;
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break;
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default:
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dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
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mode, mode & S_IFMT);
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return ERR_PTR(-EINVAL);
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}
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} else {
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eprintk(KERN_WARNING, "Problem allocating inode\n");
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return ERR_PTR(-ENOMEM);
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}
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return inode;
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}
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static int
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v9fs_create(struct v9fs_session_info *v9ses, u32 pfid, char *name, u32 perm,
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u8 mode, char *extension, u32 *fidp, struct v9fs_qid *qid, u32 *iounit)
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{
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int fid;
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int err;
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struct v9fs_fcall *fcall;
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fid = v9fs_get_idpool(&v9ses->fidpool);
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if (fid < 0) {
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eprintk(KERN_WARNING, "no free fids available\n");
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return -ENOSPC;
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}
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err = v9fs_t_walk(v9ses, pfid, fid, NULL, &fcall);
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if (err < 0) {
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PRINT_FCALL_ERROR("clone error", fcall);
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if (fcall && fcall->id == RWALK)
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goto clunk_fid;
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else
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goto put_fid;
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}
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kfree(fcall);
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err = v9fs_t_create(v9ses, fid, name, perm, mode, extension, &fcall);
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if (err < 0) {
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PRINT_FCALL_ERROR("create fails", fcall);
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goto clunk_fid;
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}
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if (iounit)
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*iounit = fcall->params.rcreate.iounit;
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if (qid)
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*qid = fcall->params.rcreate.qid;
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if (fidp)
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*fidp = fid;
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kfree(fcall);
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return 0;
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clunk_fid:
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v9fs_t_clunk(v9ses, fid);
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fid = V9FS_NOFID;
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put_fid:
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if (fid != V9FS_NOFID)
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v9fs_put_idpool(fid, &v9ses->fidpool);
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kfree(fcall);
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return err;
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}
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static struct v9fs_fid*
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v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
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{
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int err;
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int nfid;
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struct v9fs_fid *ret;
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struct v9fs_fcall *fcall;
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nfid = v9fs_get_idpool(&v9ses->fidpool);
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if (nfid < 0) {
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eprintk(KERN_WARNING, "no free fids available\n");
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return ERR_PTR(-ENOSPC);
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}
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err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
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&fcall);
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if (err < 0) {
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if (fcall && fcall->id == RWALK)
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goto clunk_fid;
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PRINT_FCALL_ERROR("walk error", fcall);
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v9fs_put_idpool(nfid, &v9ses->fidpool);
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goto error;
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}
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kfree(fcall);
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fcall = NULL;
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ret = v9fs_fid_create(v9ses, nfid);
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if (!ret) {
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err = -ENOMEM;
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goto clunk_fid;
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}
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err = v9fs_fid_insert(ret, dentry);
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if (err < 0) {
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v9fs_fid_destroy(ret);
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goto clunk_fid;
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}
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return ret;
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clunk_fid:
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v9fs_t_clunk(v9ses, nfid);
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error:
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kfree(fcall);
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return ERR_PTR(err);
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}
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static struct inode *
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v9fs_inode_from_fid(struct v9fs_session_info *v9ses, u32 fid,
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struct super_block *sb)
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{
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int err, umode;
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struct inode *ret;
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struct v9fs_fcall *fcall;
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ret = NULL;
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err = v9fs_t_stat(v9ses, fid, &fcall);
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if (err) {
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PRINT_FCALL_ERROR("stat error", fcall);
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goto error;
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}
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umode = p9mode2unixmode(v9ses, fcall->params.rstat.stat.mode);
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ret = v9fs_get_inode(sb, umode);
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if (IS_ERR(ret)) {
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err = PTR_ERR(ret);
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ret = NULL;
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goto error;
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}
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v9fs_stat2inode(&fcall->params.rstat.stat, ret, sb);
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kfree(fcall);
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return ret;
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error:
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kfree(fcall);
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if (ret)
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iput(ret);
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return ERR_PTR(err);
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}
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/**
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* v9fs_remove - helper function to remove files and directories
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* @dir: directory inode that is being deleted
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* @file: dentry that is being deleted
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* @rmdir: removing a directory
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*
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*/
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static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
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{
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struct v9fs_fcall *fcall = NULL;
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struct super_block *sb = NULL;
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struct v9fs_session_info *v9ses = NULL;
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struct v9fs_fid *v9fid = NULL;
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struct inode *file_inode = NULL;
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int fid = -1;
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int result = 0;
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|
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dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
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rmdir);
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file_inode = file->d_inode;
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sb = file_inode->i_sb;
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v9ses = v9fs_inode2v9ses(file_inode);
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v9fid = v9fs_fid_clone(file);
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if(IS_ERR(v9fid))
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return PTR_ERR(v9fid);
|
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|
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fid = v9fid->fid;
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if (fid < 0) {
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dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n",
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file_inode->i_ino);
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return -EBADF;
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}
|
|
|
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result = v9fs_t_remove(v9ses, fid, &fcall);
|
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if (result < 0) {
|
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PRINT_FCALL_ERROR("remove fails", fcall);
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goto Error;
|
|
}
|
|
|
|
v9fs_put_idpool(fid, &v9ses->fidpool);
|
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v9fs_fid_destroy(v9fid);
|
|
|
|
Error:
|
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kfree(fcall);
|
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return result;
|
|
}
|
|
|
|
static int
|
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v9fs_open_created(struct inode *inode, struct file *file)
|
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{
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_create - VFS hook to create files
|
|
* @inode: directory inode that is being deleted
|
|
* @dentry: dentry that is being deleted
|
|
* @mode: create permissions
|
|
* @nd: path information
|
|
*
|
|
*/
|
|
|
|
static int
|
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v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
|
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struct nameidata *nd)
|
|
{
|
|
int err;
|
|
u32 fid, perm, iounit;
|
|
int flags;
|
|
struct v9fs_session_info *v9ses;
|
|
struct v9fs_fid *dfid, *vfid, *ffid;
|
|
struct inode *inode;
|
|
struct v9fs_qid qid;
|
|
struct file *filp;
|
|
|
|
inode = NULL;
|
|
vfid = NULL;
|
|
v9ses = v9fs_inode2v9ses(dir);
|
|
dfid = v9fs_fid_clone(dentry->d_parent);
|
|
if(IS_ERR(dfid)) {
|
|
err = PTR_ERR(dfid);
|
|
goto error;
|
|
}
|
|
|
|
perm = unixmode2p9mode(v9ses, mode);
|
|
if (nd && nd->flags & LOOKUP_OPEN)
|
|
flags = nd->intent.open.flags - 1;
|
|
else
|
|
flags = O_RDWR;
|
|
|
|
err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
|
|
perm, v9fs_uflags2omode(flags), NULL, &fid, &qid, &iounit);
|
|
|
|
if (err)
|
|
goto clunk_dfid;
|
|
|
|
vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
|
|
v9fs_fid_clunk(v9ses, dfid);
|
|
if (IS_ERR(vfid)) {
|
|
err = PTR_ERR(vfid);
|
|
vfid = NULL;
|
|
goto error;
|
|
}
|
|
|
|
inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
|
|
if (IS_ERR(inode)) {
|
|
err = PTR_ERR(inode);
|
|
inode = NULL;
|
|
goto error;
|
|
}
|
|
|
|
if(v9ses->cache)
|
|
dentry->d_op = &v9fs_cached_dentry_operations;
|
|
else
|
|
dentry->d_op = &v9fs_dentry_operations;
|
|
d_instantiate(dentry, inode);
|
|
|
|
if (nd && nd->flags & LOOKUP_OPEN) {
|
|
ffid = v9fs_fid_create(v9ses, fid);
|
|
if (!ffid)
|
|
return -ENOMEM;
|
|
|
|
filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created);
|
|
if (IS_ERR(filp)) {
|
|
v9fs_fid_destroy(ffid);
|
|
return PTR_ERR(filp);
|
|
}
|
|
|
|
ffid->rdir_pos = 0;
|
|
ffid->rdir_fcall = NULL;
|
|
ffid->fidopen = 1;
|
|
ffid->iounit = iounit;
|
|
ffid->filp = filp;
|
|
filp->private_data = ffid;
|
|
}
|
|
|
|
return 0;
|
|
|
|
clunk_dfid:
|
|
v9fs_fid_clunk(v9ses, dfid);
|
|
|
|
error:
|
|
if (vfid)
|
|
v9fs_fid_destroy(vfid);
|
|
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_mkdir - VFS mkdir hook to create a directory
|
|
* @inode: inode that is being unlinked
|
|
* @dentry: dentry that is being unlinked
|
|
* @mode: mode for new directory
|
|
*
|
|
*/
|
|
|
|
static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
|
|
{
|
|
int err;
|
|
u32 fid, perm;
|
|
struct v9fs_session_info *v9ses;
|
|
struct v9fs_fid *dfid, *vfid;
|
|
struct inode *inode;
|
|
|
|
inode = NULL;
|
|
vfid = NULL;
|
|
v9ses = v9fs_inode2v9ses(dir);
|
|
dfid = v9fs_fid_clone(dentry->d_parent);
|
|
if(IS_ERR(dfid)) {
|
|
err = PTR_ERR(dfid);
|
|
goto error;
|
|
}
|
|
|
|
perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
|
|
|
|
err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
|
|
perm, V9FS_OREAD, NULL, &fid, NULL, NULL);
|
|
|
|
if (err) {
|
|
dprintk(DEBUG_ERROR, "create error %d\n", err);
|
|
goto clean_up_dfid;
|
|
}
|
|
|
|
vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
|
|
if (IS_ERR(vfid)) {
|
|
err = PTR_ERR(vfid);
|
|
vfid = NULL;
|
|
goto clean_up_dfid;
|
|
}
|
|
|
|
v9fs_fid_clunk(v9ses, dfid);
|
|
inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
|
|
if (IS_ERR(inode)) {
|
|
err = PTR_ERR(inode);
|
|
inode = NULL;
|
|
v9fs_fid_destroy(vfid);
|
|
goto error;
|
|
}
|
|
|
|
if(v9ses->cache)
|
|
dentry->d_op = &v9fs_cached_dentry_operations;
|
|
else
|
|
dentry->d_op = &v9fs_dentry_operations;
|
|
d_instantiate(dentry, inode);
|
|
return 0;
|
|
|
|
clean_up_dfid:
|
|
v9fs_fid_clunk(v9ses, dfid);
|
|
|
|
error:
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
|
|
* @dir: inode that is being walked from
|
|
* @dentry: dentry that is being walked to?
|
|
* @nameidata: path data
|
|
*
|
|
*/
|
|
|
|
static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
|
|
struct nameidata *nameidata)
|
|
{
|
|
struct super_block *sb;
|
|
struct v9fs_session_info *v9ses;
|
|
struct v9fs_fid *dirfid;
|
|
struct v9fs_fid *fid;
|
|
struct inode *inode;
|
|
struct v9fs_fcall *fcall = NULL;
|
|
int dirfidnum = -1;
|
|
int newfid = -1;
|
|
int result = 0;
|
|
|
|
dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
|
|
dir, dentry->d_name.name, dentry, nameidata);
|
|
|
|
sb = dir->i_sb;
|
|
v9ses = v9fs_inode2v9ses(dir);
|
|
dirfid = v9fs_fid_lookup(dentry->d_parent);
|
|
|
|
if(IS_ERR(dirfid))
|
|
return ERR_PTR(PTR_ERR(dirfid));
|
|
|
|
dirfidnum = dirfid->fid;
|
|
|
|
newfid = v9fs_get_idpool(&v9ses->fidpool);
|
|
if (newfid < 0) {
|
|
eprintk(KERN_WARNING, "newfid fails!\n");
|
|
result = -ENOSPC;
|
|
goto Release_Dirfid;
|
|
}
|
|
|
|
result = v9fs_t_walk(v9ses, dirfidnum, newfid,
|
|
(char *)dentry->d_name.name, &fcall);
|
|
|
|
up(&dirfid->lock);
|
|
|
|
if (result < 0) {
|
|
if (fcall && fcall->id == RWALK)
|
|
v9fs_t_clunk(v9ses, newfid);
|
|
else
|
|
v9fs_put_idpool(newfid, &v9ses->fidpool);
|
|
|
|
if (result == -ENOENT) {
|
|
d_add(dentry, NULL);
|
|
dprintk(DEBUG_VFS,
|
|
"Return negative dentry %p count %d\n",
|
|
dentry, atomic_read(&dentry->d_count));
|
|
kfree(fcall);
|
|
return NULL;
|
|
}
|
|
dprintk(DEBUG_ERROR, "walk error:%d\n", result);
|
|
goto FreeFcall;
|
|
}
|
|
kfree(fcall);
|
|
|
|
result = v9fs_t_stat(v9ses, newfid, &fcall);
|
|
if (result < 0) {
|
|
dprintk(DEBUG_ERROR, "stat error\n");
|
|
goto FreeFcall;
|
|
}
|
|
|
|
inode = v9fs_get_inode(sb, p9mode2unixmode(v9ses,
|
|
fcall->params.rstat.stat.mode));
|
|
|
|
if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) {
|
|
eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n",
|
|
PTR_ERR(inode));
|
|
|
|
result = -ENOSPC;
|
|
goto FreeFcall;
|
|
}
|
|
|
|
inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat.qid);
|
|
|
|
fid = v9fs_fid_create(v9ses, newfid);
|
|
if (fid == NULL) {
|
|
dprintk(DEBUG_ERROR, "couldn't insert\n");
|
|
result = -ENOMEM;
|
|
goto FreeFcall;
|
|
}
|
|
|
|
result = v9fs_fid_insert(fid, dentry);
|
|
if (result < 0)
|
|
goto FreeFcall;
|
|
|
|
fid->qid = fcall->params.rstat.stat.qid;
|
|
v9fs_stat2inode(&fcall->params.rstat.stat, inode, inode->i_sb);
|
|
if((fid->qid.version)&&(v9ses->cache))
|
|
dentry->d_op = &v9fs_cached_dentry_operations;
|
|
else
|
|
dentry->d_op = &v9fs_dentry_operations;
|
|
|
|
d_add(dentry, inode);
|
|
kfree(fcall);
|
|
|
|
return NULL;
|
|
|
|
Release_Dirfid:
|
|
up(&dirfid->lock);
|
|
|
|
FreeFcall:
|
|
kfree(fcall);
|
|
|
|
return ERR_PTR(result);
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_unlink - VFS unlink hook to delete an inode
|
|
* @i: inode that is being unlinked
|
|
* @d: dentry that is being unlinked
|
|
*
|
|
*/
|
|
|
|
static int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
|
|
{
|
|
return v9fs_remove(i, d, 0);
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_rmdir - VFS unlink hook to delete a directory
|
|
* @i: inode that is being unlinked
|
|
* @d: dentry that is being unlinked
|
|
*
|
|
*/
|
|
|
|
static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
|
|
{
|
|
return v9fs_remove(i, d, 1);
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_rename - VFS hook to rename an inode
|
|
* @old_dir: old dir inode
|
|
* @old_dentry: old dentry
|
|
* @new_dir: new dir inode
|
|
* @new_dentry: new dentry
|
|
*
|
|
*/
|
|
|
|
static int
|
|
v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry)
|
|
{
|
|
struct inode *old_inode = old_dentry->d_inode;
|
|
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode);
|
|
struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry);
|
|
struct v9fs_fid *olddirfid;
|
|
struct v9fs_fid *newdirfid;
|
|
struct v9fs_wstat wstat;
|
|
struct v9fs_fcall *fcall = NULL;
|
|
int fid = -1;
|
|
int olddirfidnum = -1;
|
|
int newdirfidnum = -1;
|
|
int retval = 0;
|
|
|
|
dprintk(DEBUG_VFS, "\n");
|
|
|
|
if(IS_ERR(oldfid))
|
|
return PTR_ERR(oldfid);
|
|
|
|
olddirfid = v9fs_fid_clone(old_dentry->d_parent);
|
|
if(IS_ERR(olddirfid)) {
|
|
retval = PTR_ERR(olddirfid);
|
|
goto Release_lock;
|
|
}
|
|
|
|
newdirfid = v9fs_fid_clone(new_dentry->d_parent);
|
|
if(IS_ERR(newdirfid)) {
|
|
retval = PTR_ERR(newdirfid);
|
|
goto Clunk_olddir;
|
|
}
|
|
|
|
/* 9P can only handle file rename in the same directory */
|
|
if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) {
|
|
dprintk(DEBUG_ERROR, "old dir and new dir are different\n");
|
|
retval = -EXDEV;
|
|
goto Clunk_newdir;
|
|
}
|
|
|
|
fid = oldfid->fid;
|
|
olddirfidnum = olddirfid->fid;
|
|
newdirfidnum = newdirfid->fid;
|
|
|
|
if (fid < 0) {
|
|
dprintk(DEBUG_ERROR, "no fid for old file #%lu\n",
|
|
old_inode->i_ino);
|
|
retval = -EBADF;
|
|
goto Clunk_newdir;
|
|
}
|
|
|
|
v9fs_blank_wstat(&wstat);
|
|
wstat.muid = v9ses->name;
|
|
wstat.name = (char *) new_dentry->d_name.name;
|
|
|
|
retval = v9fs_t_wstat(v9ses, fid, &wstat, &fcall);
|
|
|
|
if (retval < 0)
|
|
PRINT_FCALL_ERROR("wstat error", fcall);
|
|
|
|
kfree(fcall);
|
|
|
|
Clunk_newdir:
|
|
v9fs_fid_clunk(v9ses, newdirfid);
|
|
|
|
Clunk_olddir:
|
|
v9fs_fid_clunk(v9ses, olddirfid);
|
|
|
|
Release_lock:
|
|
up(&oldfid->lock);
|
|
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_getattr - retrieve file metadata
|
|
* @mnt - mount information
|
|
* @dentry - file to get attributes on
|
|
* @stat - metadata structure to populate
|
|
*
|
|
*/
|
|
|
|
static int
|
|
v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
|
|
struct kstat *stat)
|
|
{
|
|
struct v9fs_fcall *fcall = NULL;
|
|
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
|
|
struct v9fs_fid *fid = v9fs_fid_clone(dentry);
|
|
int err = -EPERM;
|
|
|
|
dprintk(DEBUG_VFS, "dentry: %p\n", dentry);
|
|
if(IS_ERR(fid))
|
|
return PTR_ERR(fid);
|
|
|
|
err = v9fs_t_stat(v9ses, fid->fid, &fcall);
|
|
|
|
if (err < 0)
|
|
dprintk(DEBUG_ERROR, "stat error\n");
|
|
else {
|
|
v9fs_stat2inode(&fcall->params.rstat.stat, dentry->d_inode,
|
|
dentry->d_inode->i_sb);
|
|
generic_fillattr(dentry->d_inode, stat);
|
|
}
|
|
|
|
kfree(fcall);
|
|
v9fs_fid_clunk(v9ses, fid);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_setattr - set file metadata
|
|
* @dentry: file whose metadata to set
|
|
* @iattr: metadata assignment structure
|
|
*
|
|
*/
|
|
|
|
static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
|
|
{
|
|
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
|
|
struct v9fs_fid *fid = v9fs_fid_clone(dentry);
|
|
struct v9fs_fcall *fcall = NULL;
|
|
struct v9fs_wstat wstat;
|
|
int res = -EPERM;
|
|
|
|
dprintk(DEBUG_VFS, "\n");
|
|
if(IS_ERR(fid))
|
|
return PTR_ERR(fid);
|
|
|
|
v9fs_blank_wstat(&wstat);
|
|
if (iattr->ia_valid & ATTR_MODE)
|
|
wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
|
|
|
|
if (iattr->ia_valid & ATTR_MTIME)
|
|
wstat.mtime = iattr->ia_mtime.tv_sec;
|
|
|
|
if (iattr->ia_valid & ATTR_ATIME)
|
|
wstat.atime = iattr->ia_atime.tv_sec;
|
|
|
|
if (iattr->ia_valid & ATTR_SIZE)
|
|
wstat.length = iattr->ia_size;
|
|
|
|
if (v9ses->extended) {
|
|
if (iattr->ia_valid & ATTR_UID)
|
|
wstat.n_uid = iattr->ia_uid;
|
|
|
|
if (iattr->ia_valid & ATTR_GID)
|
|
wstat.n_gid = iattr->ia_gid;
|
|
}
|
|
|
|
res = v9fs_t_wstat(v9ses, fid->fid, &wstat, &fcall);
|
|
|
|
if (res < 0)
|
|
PRINT_FCALL_ERROR("wstat error", fcall);
|
|
|
|
kfree(fcall);
|
|
if (res >= 0)
|
|
res = inode_setattr(dentry->d_inode, iattr);
|
|
|
|
v9fs_fid_clunk(v9ses, fid);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* v9fs_stat2inode - populate an inode structure with mistat info
|
|
* @stat: Plan 9 metadata (mistat) structure
|
|
* @inode: inode to populate
|
|
* @sb: superblock of filesystem
|
|
*
|
|
*/
|
|
|
|
void
|
|
v9fs_stat2inode(struct v9fs_stat *stat, struct inode *inode,
|
|
struct super_block *sb)
|
|
{
|
|
int n;
|
|
char ext[32];
|
|
struct v9fs_session_info *v9ses = sb->s_fs_info;
|
|
|
|
inode->i_nlink = 1;
|
|
|
|
inode->i_atime.tv_sec = stat->atime;
|
|
inode->i_mtime.tv_sec = stat->mtime;
|
|
inode->i_ctime.tv_sec = stat->mtime;
|
|
|
|
inode->i_uid = v9ses->uid;
|
|
inode->i_gid = v9ses->gid;
|
|
|
|
if (v9ses->extended) {
|
|
inode->i_uid = stat->n_uid;
|
|
inode->i_gid = stat->n_gid;
|
|
}
|
|
|
|
inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
|
|
if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
|
|
char type = 0;
|
|
int major = -1;
|
|
int minor = -1;
|
|
|
|
n = stat->extension.len;
|
|
if (n > sizeof(ext)-1)
|
|
n = sizeof(ext)-1;
|
|
memmove(ext, stat->extension.str, n);
|
|
ext[n] = 0;
|
|
sscanf(ext, "%c %u %u", &type, &major, &minor);
|
|
switch (type) {
|
|
case 'c':
|
|
inode->i_mode &= ~S_IFBLK;
|
|
inode->i_mode |= S_IFCHR;
|
|
break;
|
|
case 'b':
|
|
break;
|
|
default:
|
|
dprintk(DEBUG_ERROR, "Unknown special type %c (%.*s)\n",
|
|
type, stat->extension.len, stat->extension.str);
|
|
};
|
|
inode->i_rdev = MKDEV(major, minor);
|
|
} else
|
|
inode->i_rdev = 0;
|
|
|
|
inode->i_size = stat->length;
|
|
|
|
inode->i_blocks =
|
|
(inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
|
|
}
|
|
|
|
/**
|
|
* v9fs_qid2ino - convert qid into inode number
|
|
* @qid: qid to hash
|
|
*
|
|
* BUG: potential for inode number collisions?
|
|
*/
|
|
|
|
ino_t v9fs_qid2ino(struct v9fs_qid *qid)
|
|
{
|
|
u64 path = qid->path + 2;
|
|
ino_t i = 0;
|
|
|
|
if (sizeof(ino_t) == sizeof(path))
|
|
memcpy(&i, &path, sizeof(ino_t));
|
|
else
|
|
i = (ino_t) (path ^ (path >> 32));
|
|
|
|
return i;
|
|
}
|
|
|
|
/**
|
|
* v9fs_readlink - read a symlink's location (internal version)
|
|
* @dentry: dentry for symlink
|
|
* @buffer: buffer to load symlink location into
|
|
* @buflen: length of buffer
|
|
*
|
|
*/
|
|
|
|
static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
|
|
{
|
|
int retval = -EPERM;
|
|
|
|
struct v9fs_fcall *fcall = NULL;
|
|
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
|
|
struct v9fs_fid *fid = v9fs_fid_clone(dentry);
|
|
|
|
if(IS_ERR(fid))
|
|
return PTR_ERR(fid);
|
|
|
|
if (!v9ses->extended) {
|
|
retval = -EBADF;
|
|
dprintk(DEBUG_ERROR, "not extended\n");
|
|
goto ClunkFid;
|
|
}
|
|
|
|
dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name);
|
|
retval = v9fs_t_stat(v9ses, fid->fid, &fcall);
|
|
|
|
if (retval < 0) {
|
|
dprintk(DEBUG_ERROR, "stat error\n");
|
|
goto FreeFcall;
|
|
}
|
|
|
|
if (!fcall) {
|
|
retval = -EIO;
|
|
goto ClunkFid;
|
|
}
|
|
|
|
if (!(fcall->params.rstat.stat.mode & V9FS_DMSYMLINK)) {
|
|
retval = -EINVAL;
|
|
goto FreeFcall;
|
|
}
|
|
|
|
/* copy extension buffer into buffer */
|
|
if (fcall->params.rstat.stat.extension.len < buflen)
|
|
buflen = fcall->params.rstat.stat.extension.len + 1;
|
|
|
|
memmove(buffer, fcall->params.rstat.stat.extension.str, buflen - 1);
|
|
buffer[buflen-1] = 0;
|
|
|
|
dprintk(DEBUG_ERROR, "%s -> %.*s (%s)\n", dentry->d_name.name, fcall->params.rstat.stat.extension.len,
|
|
fcall->params.rstat.stat.extension.str, buffer);
|
|
retval = buflen;
|
|
|
|
FreeFcall:
|
|
kfree(fcall);
|
|
|
|
ClunkFid:
|
|
v9fs_fid_clunk(v9ses, fid);
|
|
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_readlink - read a symlink's location
|
|
* @dentry: dentry for symlink
|
|
* @buf: buffer to load symlink location into
|
|
* @buflen: length of buffer
|
|
*
|
|
*/
|
|
|
|
static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer,
|
|
int buflen)
|
|
{
|
|
int retval;
|
|
int ret;
|
|
char *link = __getname();
|
|
|
|
if (unlikely(!link))
|
|
return -ENOMEM;
|
|
|
|
if (buflen > PATH_MAX)
|
|
buflen = PATH_MAX;
|
|
|
|
dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
|
|
|
|
retval = v9fs_readlink(dentry, link, buflen);
|
|
|
|
if (retval > 0) {
|
|
if ((ret = copy_to_user(buffer, link, retval)) != 0) {
|
|
dprintk(DEBUG_ERROR, "problem copying to user: %d\n",
|
|
ret);
|
|
retval = ret;
|
|
}
|
|
}
|
|
|
|
__putname(link);
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_follow_link - follow a symlink path
|
|
* @dentry: dentry for symlink
|
|
* @nd: nameidata
|
|
*
|
|
*/
|
|
|
|
static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
|
|
{
|
|
int len = 0;
|
|
char *link = __getname();
|
|
|
|
dprintk(DEBUG_VFS, "%s n", dentry->d_name.name);
|
|
|
|
if (!link)
|
|
link = ERR_PTR(-ENOMEM);
|
|
else {
|
|
len = v9fs_readlink(dentry, link, PATH_MAX);
|
|
|
|
if (len < 0) {
|
|
__putname(link);
|
|
link = ERR_PTR(len);
|
|
} else
|
|
link[len] = 0;
|
|
}
|
|
nd_set_link(nd, link);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_put_link - release a symlink path
|
|
* @dentry: dentry for symlink
|
|
* @nd: nameidata
|
|
*
|
|
*/
|
|
|
|
static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
|
|
{
|
|
char *s = nd_get_link(nd);
|
|
|
|
dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s);
|
|
if (!IS_ERR(s))
|
|
__putname(s);
|
|
}
|
|
|
|
static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
|
|
int mode, const char *extension)
|
|
{
|
|
int err;
|
|
u32 fid, perm;
|
|
struct v9fs_session_info *v9ses;
|
|
struct v9fs_fid *dfid, *vfid = NULL;
|
|
struct inode *inode = NULL;
|
|
|
|
v9ses = v9fs_inode2v9ses(dir);
|
|
if (!v9ses->extended) {
|
|
dprintk(DEBUG_ERROR, "not extended\n");
|
|
return -EPERM;
|
|
}
|
|
|
|
dfid = v9fs_fid_clone(dentry->d_parent);
|
|
if(IS_ERR(dfid)) {
|
|
err = PTR_ERR(dfid);
|
|
goto error;
|
|
}
|
|
|
|
perm = unixmode2p9mode(v9ses, mode);
|
|
|
|
err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
|
|
perm, V9FS_OREAD, (char *) extension, &fid, NULL, NULL);
|
|
|
|
if (err)
|
|
goto clunk_dfid;
|
|
|
|
err = v9fs_t_clunk(v9ses, fid);
|
|
if (err)
|
|
goto clunk_dfid;
|
|
|
|
vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
|
|
if (IS_ERR(vfid)) {
|
|
err = PTR_ERR(vfid);
|
|
vfid = NULL;
|
|
goto clunk_dfid;
|
|
}
|
|
|
|
inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
|
|
if (IS_ERR(inode)) {
|
|
err = PTR_ERR(inode);
|
|
inode = NULL;
|
|
goto free_vfid;
|
|
}
|
|
|
|
if(v9ses->cache)
|
|
dentry->d_op = &v9fs_cached_dentry_operations;
|
|
else
|
|
dentry->d_op = &v9fs_dentry_operations;
|
|
d_instantiate(dentry, inode);
|
|
return 0;
|
|
|
|
free_vfid:
|
|
v9fs_fid_destroy(vfid);
|
|
|
|
clunk_dfid:
|
|
v9fs_fid_clunk(v9ses, dfid);
|
|
|
|
error:
|
|
return err;
|
|
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_symlink - helper function to create symlinks
|
|
* @dir: directory inode containing symlink
|
|
* @dentry: dentry for symlink
|
|
* @symname: symlink data
|
|
*
|
|
* See 9P2000.u RFC for more information
|
|
*
|
|
*/
|
|
|
|
static int
|
|
v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
|
|
{
|
|
dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
|
|
symname);
|
|
|
|
return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_link - create a hardlink
|
|
* @old_dentry: dentry for file to link to
|
|
* @dir: inode destination for new link
|
|
* @dentry: dentry for link
|
|
*
|
|
*/
|
|
|
|
/* XXX - lots of code dup'd from symlink and creates,
|
|
* figure out a better reuse strategy
|
|
*/
|
|
|
|
static int
|
|
v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
|
|
struct dentry *dentry)
|
|
{
|
|
int retval;
|
|
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
|
|
struct v9fs_fid *oldfid;
|
|
char *name;
|
|
|
|
dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
|
|
old_dentry->d_name.name);
|
|
|
|
oldfid = v9fs_fid_clone(old_dentry);
|
|
if(IS_ERR(oldfid))
|
|
return PTR_ERR(oldfid);
|
|
|
|
name = __getname();
|
|
if (unlikely(!name)) {
|
|
retval = -ENOMEM;
|
|
goto clunk_fid;
|
|
}
|
|
|
|
sprintf(name, "%d\n", oldfid->fid);
|
|
retval = v9fs_vfs_mkspecial(dir, dentry, V9FS_DMLINK, name);
|
|
__putname(name);
|
|
|
|
clunk_fid:
|
|
v9fs_fid_clunk(v9ses, oldfid);
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_mknod - create a special file
|
|
* @dir: inode destination for new link
|
|
* @dentry: dentry for file
|
|
* @mode: mode for creation
|
|
* @dev_t: device associated with special file
|
|
*
|
|
*/
|
|
|
|
static int
|
|
v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
|
|
{
|
|
int retval;
|
|
char *name;
|
|
|
|
dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
|
|
dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
|
|
|
|
if (!new_valid_dev(rdev))
|
|
return -EINVAL;
|
|
|
|
name = __getname();
|
|
if (!name)
|
|
return -ENOMEM;
|
|
/* build extension */
|
|
if (S_ISBLK(mode))
|
|
sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
|
|
else if (S_ISCHR(mode))
|
|
sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
|
|
else if (S_ISFIFO(mode))
|
|
*name = 0;
|
|
else {
|
|
__putname(name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
|
|
__putname(name);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static const struct inode_operations v9fs_dir_inode_operations_ext = {
|
|
.create = v9fs_vfs_create,
|
|
.lookup = v9fs_vfs_lookup,
|
|
.symlink = v9fs_vfs_symlink,
|
|
.link = v9fs_vfs_link,
|
|
.unlink = v9fs_vfs_unlink,
|
|
.mkdir = v9fs_vfs_mkdir,
|
|
.rmdir = v9fs_vfs_rmdir,
|
|
.mknod = v9fs_vfs_mknod,
|
|
.rename = v9fs_vfs_rename,
|
|
.readlink = v9fs_vfs_readlink,
|
|
.getattr = v9fs_vfs_getattr,
|
|
.setattr = v9fs_vfs_setattr,
|
|
};
|
|
|
|
static const struct inode_operations v9fs_dir_inode_operations = {
|
|
.create = v9fs_vfs_create,
|
|
.lookup = v9fs_vfs_lookup,
|
|
.unlink = v9fs_vfs_unlink,
|
|
.mkdir = v9fs_vfs_mkdir,
|
|
.rmdir = v9fs_vfs_rmdir,
|
|
.mknod = v9fs_vfs_mknod,
|
|
.rename = v9fs_vfs_rename,
|
|
.getattr = v9fs_vfs_getattr,
|
|
.setattr = v9fs_vfs_setattr,
|
|
};
|
|
|
|
static const struct inode_operations v9fs_file_inode_operations = {
|
|
.getattr = v9fs_vfs_getattr,
|
|
.setattr = v9fs_vfs_setattr,
|
|
};
|
|
|
|
static const struct inode_operations v9fs_symlink_inode_operations = {
|
|
.readlink = v9fs_vfs_readlink,
|
|
.follow_link = v9fs_vfs_follow_link,
|
|
.put_link = v9fs_vfs_put_link,
|
|
.getattr = v9fs_vfs_getattr,
|
|
.setattr = v9fs_vfs_setattr,
|
|
};
|