forked from Minki/linux
48e370ff93
unlinkat - Remove a directory entry size[4] Tunlinkat tag[2] dirfid[4] name[s] flag[4] size[4] Runlinkat tag[2] older Tremove have the below request format size[4] Tremove tag[2] fid[4] The remove message is used to remove a directory entry either file or directory The remove opreation is actually a directory opertation and should ideally have dirfid, if not we cannot represent the fid on server with anything other than name. We will have to derive the directory name from fid in the Tremove request. NOTE: The operation doesn't clunk the unlink fid. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
1477 lines
32 KiB
C
1477 lines
32 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/inet.h>
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#include <linux/namei.h>
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#include <linux/idr.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/xattr.h>
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#include <linux/posix_acl.h>
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#include <net/9p/9p.h>
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#include <net/9p/client.h>
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#include "v9fs.h"
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#include "v9fs_vfs.h"
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#include "fid.h"
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#include "cache.h"
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#include "xattr.h"
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#include "acl.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_dotu;
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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 |= P9_DMDIR;
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if (v9fs_proto_dotu(v9ses)) {
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if (S_ISLNK(mode))
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res |= P9_DMSYMLINK;
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if (v9ses->nodev == 0) {
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if (S_ISSOCK(mode))
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res |= P9_DMSOCKET;
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if (S_ISFIFO(mode))
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res |= P9_DMNAMEDPIPE;
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if (S_ISBLK(mode))
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res |= P9_DMDEVICE;
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if (S_ISCHR(mode))
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res |= P9_DMDEVICE;
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}
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if ((mode & S_ISUID) == S_ISUID)
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res |= P9_DMSETUID;
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if ((mode & S_ISGID) == S_ISGID)
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res |= P9_DMSETGID;
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if ((mode & S_ISVTX) == S_ISVTX)
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res |= P9_DMSETVTX;
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if ((mode & P9_DMLINK))
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res |= P9_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 & P9_DMDIR) == P9_DMDIR)
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res |= S_IFDIR;
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else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
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res |= S_IFLNK;
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else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
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&& (v9ses->nodev == 0))
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res |= S_IFSOCK;
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else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
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&& (v9ses->nodev == 0))
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res |= S_IFIFO;
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else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
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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 (v9fs_proto_dotu(v9ses)) {
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if ((mode & P9_DMSETUID) == P9_DMSETUID)
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res |= S_ISUID;
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if ((mode & P9_DMSETGID) == P9_DMSETGID)
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res |= S_ISGID;
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if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
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res |= S_ISVTX;
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}
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return res;
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}
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/**
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* v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
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* @uflags: flags to convert
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* @extended: if .u extensions are active
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*/
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int v9fs_uflags2omode(int uflags, int extended)
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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 = P9_OREAD;
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break;
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case O_WRONLY:
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ret = P9_OWRITE;
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break;
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case O_RDWR:
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ret = P9_ORDWR;
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break;
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}
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if (uflags & O_TRUNC)
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ret |= P9_OTRUNC;
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if (extended) {
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if (uflags & O_EXCL)
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ret |= P9_OEXCL;
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if (uflags & O_APPEND)
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ret |= P9_OAPPEND;
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}
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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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* @wstat: structure to initialize
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*
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*/
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void
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v9fs_blank_wstat(struct p9_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_alloc_inode - helper function to allocate an inode
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*
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*/
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struct inode *v9fs_alloc_inode(struct super_block *sb)
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{
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struct v9fs_inode *v9inode;
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v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache,
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GFP_KERNEL);
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if (!v9inode)
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return NULL;
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#ifdef CONFIG_9P_FSCACHE
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v9inode->fscache = NULL;
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spin_lock_init(&v9inode->fscache_lock);
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#endif
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v9inode->writeback_fid = NULL;
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v9inode->cache_validity = 0;
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mutex_init(&v9inode->v_mutex);
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return &v9inode->vfs_inode;
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}
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/**
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* v9fs_destroy_inode - destroy an inode
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*
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*/
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static void v9fs_i_callback(struct rcu_head *head)
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{
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struct inode *inode = container_of(head, struct inode, i_rcu);
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INIT_LIST_HEAD(&inode->i_dentry);
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kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
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}
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void v9fs_destroy_inode(struct inode *inode)
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{
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call_rcu(&inode->i_rcu, v9fs_i_callback);
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}
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int v9fs_init_inode(struct v9fs_session_info *v9ses,
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struct inode *inode, int mode)
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{
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int err = 0;
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inode_init_owner(inode, NULL, mode);
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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 (v9fs_proto_dotl(v9ses)) {
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inode->i_op = &v9fs_file_inode_operations_dotl;
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inode->i_fop = &v9fs_file_operations_dotl;
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} else if (v9fs_proto_dotu(v9ses)) {
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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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} else {
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P9_DPRINTK(P9_DEBUG_ERROR,
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"special files without extended mode\n");
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err = -EINVAL;
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goto error;
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}
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init_special_inode(inode, inode->i_mode, inode->i_rdev);
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break;
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case S_IFREG:
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if (v9fs_proto_dotl(v9ses)) {
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inode->i_op = &v9fs_file_inode_operations_dotl;
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if (v9ses->cache)
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inode->i_fop =
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&v9fs_cached_file_operations_dotl;
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else
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inode->i_fop = &v9fs_file_operations_dotl;
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} else {
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inode->i_op = &v9fs_file_inode_operations;
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if (v9ses->cache)
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inode->i_fop = &v9fs_cached_file_operations;
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else
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inode->i_fop = &v9fs_file_operations;
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}
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break;
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case S_IFLNK:
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if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
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P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with "
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"legacy protocol.\n");
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err = -EINVAL;
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goto error;
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}
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if (v9fs_proto_dotl(v9ses))
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inode->i_op = &v9fs_symlink_inode_operations_dotl;
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else
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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 (v9fs_proto_dotl(v9ses))
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inode->i_op = &v9fs_dir_inode_operations_dotl;
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else if (v9fs_proto_dotu(v9ses))
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inode->i_op = &v9fs_dir_inode_operations_dotu;
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else
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inode->i_op = &v9fs_dir_inode_operations;
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if (v9fs_proto_dotl(v9ses))
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inode->i_fop = &v9fs_dir_operations_dotl;
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else
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inode->i_fop = &v9fs_dir_operations;
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break;
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default:
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P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
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mode, mode & S_IFMT);
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err = -EINVAL;
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goto error;
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}
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error:
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return err;
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|
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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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int err;
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struct inode *inode;
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struct v9fs_session_info *v9ses = sb->s_fs_info;
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P9_DPRINTK(P9_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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P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n");
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return ERR_PTR(-ENOMEM);
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}
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err = v9fs_init_inode(v9ses, inode, mode);
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if (err) {
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iput(inode);
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return ERR_PTR(err);
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}
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return inode;
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}
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|
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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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|
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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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|
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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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|
|
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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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|
|
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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;
|
|
|
|
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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* v9fs_clear_inode - release an inode
|
|
* @inode: inode to release
|
|
*
|
|
*/
|
|
void v9fs_evict_inode(struct inode *inode)
|
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{
|
|
struct v9fs_inode *v9inode = V9FS_I(inode);
|
|
|
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truncate_inode_pages(inode->i_mapping, 0);
|
|
end_writeback(inode);
|
|
filemap_fdatawrite(inode->i_mapping);
|
|
|
|
#ifdef CONFIG_9P_FSCACHE
|
|
v9fs_cache_inode_put_cookie(inode);
|
|
#endif
|
|
/* clunk the fid stashed in writeback_fid */
|
|
if (v9inode->writeback_fid) {
|
|
p9_client_clunk(v9inode->writeback_fid);
|
|
v9inode->writeback_fid = NULL;
|
|
}
|
|
}
|
|
|
|
static int v9fs_test_inode(struct inode *inode, void *data)
|
|
{
|
|
int umode;
|
|
struct v9fs_inode *v9inode = V9FS_I(inode);
|
|
struct p9_wstat *st = (struct p9_wstat *)data;
|
|
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
|
|
|
|
umode = p9mode2unixmode(v9ses, st->mode);
|
|
/* don't match inode of different type */
|
|
if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
|
|
return 0;
|
|
|
|
/* compare qid details */
|
|
if (memcmp(&v9inode->qid.version,
|
|
&st->qid.version, sizeof(v9inode->qid.version)))
|
|
return 0;
|
|
|
|
if (v9inode->qid.type != st->qid.type)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static int v9fs_test_new_inode(struct inode *inode, void *data)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int v9fs_set_inode(struct inode *inode, void *data)
|
|
{
|
|
struct v9fs_inode *v9inode = V9FS_I(inode);
|
|
struct p9_wstat *st = (struct p9_wstat *)data;
|
|
|
|
memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
|
|
return 0;
|
|
}
|
|
|
|
static struct inode *v9fs_qid_iget(struct super_block *sb,
|
|
struct p9_qid *qid,
|
|
struct p9_wstat *st,
|
|
int new)
|
|
{
|
|
int retval, umode;
|
|
unsigned long i_ino;
|
|
struct inode *inode;
|
|
struct v9fs_session_info *v9ses = sb->s_fs_info;
|
|
int (*test)(struct inode *, void *);
|
|
|
|
if (new)
|
|
test = v9fs_test_new_inode;
|
|
else
|
|
test = v9fs_test_inode;
|
|
|
|
i_ino = v9fs_qid2ino(qid);
|
|
inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
|
|
if (!inode)
|
|
return ERR_PTR(-ENOMEM);
|
|
if (!(inode->i_state & I_NEW))
|
|
return inode;
|
|
/*
|
|
* initialize the inode with the stat info
|
|
* FIXME!! we may need support for stale inodes
|
|
* later.
|
|
*/
|
|
inode->i_ino = i_ino;
|
|
umode = p9mode2unixmode(v9ses, st->mode);
|
|
retval = v9fs_init_inode(v9ses, inode, umode);
|
|
if (retval)
|
|
goto error;
|
|
|
|
v9fs_stat2inode(st, inode, sb);
|
|
#ifdef CONFIG_9P_FSCACHE
|
|
v9fs_cache_inode_get_cookie(inode);
|
|
#endif
|
|
unlock_new_inode(inode);
|
|
return inode;
|
|
error:
|
|
unlock_new_inode(inode);
|
|
iput(inode);
|
|
return ERR_PTR(retval);
|
|
|
|
}
|
|
|
|
struct inode *
|
|
v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
|
|
struct super_block *sb, int new)
|
|
{
|
|
struct p9_wstat *st;
|
|
struct inode *inode = NULL;
|
|
|
|
st = p9_client_stat(fid);
|
|
if (IS_ERR(st))
|
|
return ERR_CAST(st);
|
|
|
|
inode = v9fs_qid_iget(sb, &st->qid, st, new);
|
|
p9stat_free(st);
|
|
kfree(st);
|
|
return inode;
|
|
}
|
|
|
|
/**
|
|
* v9fs_remove - helper function to remove files and directories
|
|
* @dir: directory inode that is being deleted
|
|
* @dentry: dentry that is being deleted
|
|
* @rmdir: removing a directory
|
|
*
|
|
*/
|
|
|
|
static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
|
|
{
|
|
struct inode *inode;
|
|
int retval = -EOPNOTSUPP;
|
|
struct p9_fid *v9fid, *dfid;
|
|
struct v9fs_session_info *v9ses;
|
|
|
|
P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
|
|
dir, dentry, flags);
|
|
|
|
v9ses = v9fs_inode2v9ses(dir);
|
|
inode = dentry->d_inode;
|
|
dfid = v9fs_fid_lookup(dentry->d_parent);
|
|
if (IS_ERR(dfid)) {
|
|
retval = PTR_ERR(dfid);
|
|
P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
|
|
return retval;
|
|
}
|
|
if (v9fs_proto_dotl(v9ses))
|
|
retval = p9_client_unlinkat(dfid, dentry->d_name.name, flags);
|
|
if (retval == -EOPNOTSUPP) {
|
|
/* Try the one based on path */
|
|
v9fid = v9fs_fid_clone(dentry);
|
|
if (IS_ERR(v9fid))
|
|
return PTR_ERR(v9fid);
|
|
retval = p9_client_remove(v9fid);
|
|
}
|
|
if (!retval) {
|
|
/*
|
|
* directories on unlink should have zero
|
|
* link count
|
|
*/
|
|
if (flags & AT_REMOVEDIR) {
|
|
clear_nlink(inode);
|
|
drop_nlink(dir);
|
|
} else
|
|
drop_nlink(inode);
|
|
|
|
v9fs_invalidate_inode_attr(inode);
|
|
v9fs_invalidate_inode_attr(dir);
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* v9fs_create - Create a file
|
|
* @v9ses: session information
|
|
* @dir: directory that dentry is being created in
|
|
* @dentry: dentry that is being created
|
|
* @extension: 9p2000.u extension string to support devices, etc.
|
|
* @perm: create permissions
|
|
* @mode: open mode
|
|
*
|
|
*/
|
|
static struct p9_fid *
|
|
v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
|
|
struct dentry *dentry, char *extension, u32 perm, u8 mode)
|
|
{
|
|
int err;
|
|
char *name;
|
|
struct p9_fid *dfid, *ofid, *fid;
|
|
struct inode *inode;
|
|
|
|
P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
|
|
|
|
err = 0;
|
|
ofid = NULL;
|
|
fid = NULL;
|
|
name = (char *) dentry->d_name.name;
|
|
dfid = v9fs_fid_lookup(dentry->d_parent);
|
|
if (IS_ERR(dfid)) {
|
|
err = PTR_ERR(dfid);
|
|
P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
/* clone a fid to use for creation */
|
|
ofid = p9_client_walk(dfid, 0, NULL, 1);
|
|
if (IS_ERR(ofid)) {
|
|
err = PTR_ERR(ofid);
|
|
P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
err = p9_client_fcreate(ofid, name, perm, mode, extension);
|
|
if (err < 0) {
|
|
P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
|
|
goto error;
|
|
}
|
|
|
|
/* now walk from the parent so we can get unopened fid */
|
|
fid = p9_client_walk(dfid, 1, &name, 1);
|
|
if (IS_ERR(fid)) {
|
|
err = PTR_ERR(fid);
|
|
P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
|
|
fid = NULL;
|
|
goto error;
|
|
}
|
|
|
|
/* instantiate inode and assign the unopened fid to the dentry */
|
|
inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
|
|
if (IS_ERR(inode)) {
|
|
err = PTR_ERR(inode);
|
|
P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
|
|
goto error;
|
|
}
|
|
d_instantiate(dentry, inode);
|
|
err = v9fs_fid_add(dentry, fid);
|
|
if (err < 0)
|
|
goto error;
|
|
|
|
return ofid;
|
|
|
|
error:
|
|
if (ofid)
|
|
p9_client_clunk(ofid);
|
|
|
|
if (fid)
|
|
p9_client_clunk(fid);
|
|
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_create - VFS hook to create files
|
|
* @dir: directory inode that is being created
|
|
* @dentry: dentry that is being deleted
|
|
* @mode: create permissions
|
|
* @nd: path information
|
|
*
|
|
*/
|
|
|
|
static int
|
|
v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
|
|
struct nameidata *nd)
|
|
{
|
|
int err;
|
|
u32 perm;
|
|
int flags;
|
|
struct file *filp;
|
|
struct v9fs_inode *v9inode;
|
|
struct v9fs_session_info *v9ses;
|
|
struct p9_fid *fid, *inode_fid;
|
|
|
|
err = 0;
|
|
fid = NULL;
|
|
v9ses = v9fs_inode2v9ses(dir);
|
|
perm = unixmode2p9mode(v9ses, mode);
|
|
if (nd)
|
|
flags = nd->intent.open.flags;
|
|
else
|
|
flags = O_RDWR;
|
|
|
|
fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
|
|
v9fs_uflags2omode(flags,
|
|
v9fs_proto_dotu(v9ses)));
|
|
if (IS_ERR(fid)) {
|
|
err = PTR_ERR(fid);
|
|
fid = NULL;
|
|
goto error;
|
|
}
|
|
|
|
v9fs_invalidate_inode_attr(dir);
|
|
/* if we are opening a file, assign the open fid to the file */
|
|
if (nd) {
|
|
v9inode = V9FS_I(dentry->d_inode);
|
|
mutex_lock(&v9inode->v_mutex);
|
|
if (v9ses->cache && !v9inode->writeback_fid &&
|
|
((flags & O_ACCMODE) != O_RDONLY)) {
|
|
/*
|
|
* clone a fid and add it to writeback_fid
|
|
* we do it during open time instead of
|
|
* page dirty time via write_begin/page_mkwrite
|
|
* because we want write after unlink usecase
|
|
* to work.
|
|
*/
|
|
inode_fid = v9fs_writeback_fid(dentry);
|
|
if (IS_ERR(inode_fid)) {
|
|
err = PTR_ERR(inode_fid);
|
|
mutex_unlock(&v9inode->v_mutex);
|
|
goto error;
|
|
}
|
|
v9inode->writeback_fid = (void *) inode_fid;
|
|
}
|
|
mutex_unlock(&v9inode->v_mutex);
|
|
filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
|
|
if (IS_ERR(filp)) {
|
|
err = PTR_ERR(filp);
|
|
goto error;
|
|
}
|
|
|
|
filp->private_data = fid;
|
|
#ifdef CONFIG_9P_FSCACHE
|
|
if (v9ses->cache)
|
|
v9fs_cache_inode_set_cookie(dentry->d_inode, filp);
|
|
#endif
|
|
} else
|
|
p9_client_clunk(fid);
|
|
|
|
return 0;
|
|
|
|
error:
|
|
if (fid)
|
|
p9_client_clunk(fid);
|
|
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_mkdir - VFS mkdir hook to create a directory
|
|
* @dir: 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 perm;
|
|
struct p9_fid *fid;
|
|
struct v9fs_session_info *v9ses;
|
|
|
|
P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
|
|
err = 0;
|
|
v9ses = v9fs_inode2v9ses(dir);
|
|
perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
|
|
fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
|
|
if (IS_ERR(fid)) {
|
|
err = PTR_ERR(fid);
|
|
fid = NULL;
|
|
} else {
|
|
inc_nlink(dir);
|
|
v9fs_invalidate_inode_attr(dir);
|
|
}
|
|
|
|
if (fid)
|
|
p9_client_clunk(fid);
|
|
|
|
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
|
|
*
|
|
*/
|
|
|
|
struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
|
|
struct nameidata *nameidata)
|
|
{
|
|
struct super_block *sb;
|
|
struct v9fs_session_info *v9ses;
|
|
struct p9_fid *dfid, *fid;
|
|
struct inode *inode;
|
|
char *name;
|
|
int result = 0;
|
|
|
|
P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
|
|
dir, dentry->d_name.name, dentry, nameidata);
|
|
|
|
if (dentry->d_name.len > NAME_MAX)
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
|
|
sb = dir->i_sb;
|
|
v9ses = v9fs_inode2v9ses(dir);
|
|
/* We can walk d_parent because we hold the dir->i_mutex */
|
|
dfid = v9fs_fid_lookup(dentry->d_parent);
|
|
if (IS_ERR(dfid))
|
|
return ERR_CAST(dfid);
|
|
|
|
name = (char *) dentry->d_name.name;
|
|
fid = p9_client_walk(dfid, 1, &name, 1);
|
|
if (IS_ERR(fid)) {
|
|
result = PTR_ERR(fid);
|
|
if (result == -ENOENT) {
|
|
inode = NULL;
|
|
goto inst_out;
|
|
}
|
|
|
|
return ERR_PTR(result);
|
|
}
|
|
|
|
inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
|
|
if (IS_ERR(inode)) {
|
|
result = PTR_ERR(inode);
|
|
inode = NULL;
|
|
goto error;
|
|
}
|
|
|
|
result = v9fs_fid_add(dentry, fid);
|
|
if (result < 0)
|
|
goto error_iput;
|
|
|
|
inst_out:
|
|
d_add(dentry, inode);
|
|
return NULL;
|
|
|
|
error_iput:
|
|
iput(inode);
|
|
error:
|
|
p9_client_clunk(fid);
|
|
|
|
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
|
|
*
|
|
*/
|
|
|
|
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
|
|
*
|
|
*/
|
|
|
|
int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
|
|
{
|
|
return v9fs_remove(i, d, AT_REMOVEDIR);
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*
|
|
*/
|
|
|
|
int
|
|
v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry)
|
|
{
|
|
int retval;
|
|
struct inode *old_inode;
|
|
struct inode *new_inode;
|
|
struct v9fs_session_info *v9ses;
|
|
struct p9_fid *oldfid;
|
|
struct p9_fid *olddirfid;
|
|
struct p9_fid *newdirfid;
|
|
struct p9_wstat wstat;
|
|
|
|
P9_DPRINTK(P9_DEBUG_VFS, "\n");
|
|
retval = 0;
|
|
old_inode = old_dentry->d_inode;
|
|
new_inode = new_dentry->d_inode;
|
|
v9ses = v9fs_inode2v9ses(old_inode);
|
|
oldfid = v9fs_fid_lookup(old_dentry);
|
|
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 done;
|
|
}
|
|
|
|
newdirfid = v9fs_fid_clone(new_dentry->d_parent);
|
|
if (IS_ERR(newdirfid)) {
|
|
retval = PTR_ERR(newdirfid);
|
|
goto clunk_olddir;
|
|
}
|
|
|
|
down_write(&v9ses->rename_sem);
|
|
if (v9fs_proto_dotl(v9ses)) {
|
|
retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
|
|
newdirfid, new_dentry->d_name.name);
|
|
if (retval == -EOPNOTSUPP)
|
|
retval = p9_client_rename(oldfid, newdirfid,
|
|
new_dentry->d_name.name);
|
|
if (retval != -EOPNOTSUPP)
|
|
goto clunk_newdir;
|
|
}
|
|
if (old_dentry->d_parent != new_dentry->d_parent) {
|
|
/*
|
|
* 9P .u can only handle file rename in the same directory
|
|
*/
|
|
|
|
P9_DPRINTK(P9_DEBUG_ERROR,
|
|
"old dir and new dir are different\n");
|
|
retval = -EXDEV;
|
|
goto clunk_newdir;
|
|
}
|
|
v9fs_blank_wstat(&wstat);
|
|
wstat.muid = v9ses->uname;
|
|
wstat.name = (char *) new_dentry->d_name.name;
|
|
retval = p9_client_wstat(oldfid, &wstat);
|
|
|
|
clunk_newdir:
|
|
if (!retval) {
|
|
if (new_inode) {
|
|
if (S_ISDIR(new_inode->i_mode))
|
|
clear_nlink(new_inode);
|
|
else
|
|
drop_nlink(new_inode);
|
|
}
|
|
if (S_ISDIR(old_inode->i_mode)) {
|
|
if (!new_inode)
|
|
inc_nlink(new_dir);
|
|
drop_nlink(old_dir);
|
|
}
|
|
v9fs_invalidate_inode_attr(old_inode);
|
|
v9fs_invalidate_inode_attr(old_dir);
|
|
v9fs_invalidate_inode_attr(new_dir);
|
|
|
|
/* successful rename */
|
|
d_move(old_dentry, new_dentry);
|
|
}
|
|
up_write(&v9ses->rename_sem);
|
|
p9_client_clunk(newdirfid);
|
|
|
|
clunk_olddir:
|
|
p9_client_clunk(olddirfid);
|
|
|
|
done:
|
|
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)
|
|
{
|
|
int err;
|
|
struct v9fs_session_info *v9ses;
|
|
struct p9_fid *fid;
|
|
struct p9_wstat *st;
|
|
|
|
P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
|
|
err = -EPERM;
|
|
v9ses = v9fs_dentry2v9ses(dentry);
|
|
if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
|
|
generic_fillattr(dentry->d_inode, stat);
|
|
return 0;
|
|
}
|
|
fid = v9fs_fid_lookup(dentry);
|
|
if (IS_ERR(fid))
|
|
return PTR_ERR(fid);
|
|
|
|
st = p9_client_stat(fid);
|
|
if (IS_ERR(st))
|
|
return PTR_ERR(st);
|
|
|
|
v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
|
|
generic_fillattr(dentry->d_inode, stat);
|
|
|
|
p9stat_free(st);
|
|
kfree(st);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
int retval;
|
|
struct v9fs_session_info *v9ses;
|
|
struct p9_fid *fid;
|
|
struct p9_wstat wstat;
|
|
|
|
P9_DPRINTK(P9_DEBUG_VFS, "\n");
|
|
retval = inode_change_ok(dentry->d_inode, iattr);
|
|
if (retval)
|
|
return retval;
|
|
|
|
retval = -EPERM;
|
|
v9ses = v9fs_dentry2v9ses(dentry);
|
|
fid = v9fs_fid_lookup(dentry);
|
|
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 (v9fs_proto_dotu(v9ses)) {
|
|
if (iattr->ia_valid & ATTR_UID)
|
|
wstat.n_uid = iattr->ia_uid;
|
|
|
|
if (iattr->ia_valid & ATTR_GID)
|
|
wstat.n_gid = iattr->ia_gid;
|
|
}
|
|
|
|
/* Write all dirty data */
|
|
if (S_ISREG(dentry->d_inode->i_mode))
|
|
filemap_write_and_wait(dentry->d_inode->i_mapping);
|
|
|
|
retval = p9_client_wstat(fid, &wstat);
|
|
if (retval < 0)
|
|
return retval;
|
|
|
|
if ((iattr->ia_valid & ATTR_SIZE) &&
|
|
iattr->ia_size != i_size_read(dentry->d_inode))
|
|
truncate_setsize(dentry->d_inode, iattr->ia_size);
|
|
|
|
v9fs_invalidate_inode_attr(dentry->d_inode);
|
|
|
|
setattr_copy(dentry->d_inode, iattr);
|
|
mark_inode_dirty(dentry->d_inode);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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 p9_wstat *stat, struct inode *inode,
|
|
struct super_block *sb)
|
|
{
|
|
char ext[32];
|
|
char tag_name[14];
|
|
unsigned int i_nlink;
|
|
struct v9fs_session_info *v9ses = sb->s_fs_info;
|
|
struct v9fs_inode *v9inode = V9FS_I(inode);
|
|
|
|
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->dfltuid;
|
|
inode->i_gid = v9ses->dfltgid;
|
|
|
|
if (v9fs_proto_dotu(v9ses)) {
|
|
inode->i_uid = stat->n_uid;
|
|
inode->i_gid = stat->n_gid;
|
|
}
|
|
if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
|
|
if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
|
|
/*
|
|
* Hadlink support got added later to
|
|
* to the .u extension. So there can be
|
|
* server out there that doesn't support
|
|
* this even with .u extension. So check
|
|
* for non NULL stat->extension
|
|
*/
|
|
strncpy(ext, stat->extension, sizeof(ext));
|
|
/* HARDLINKCOUNT %u */
|
|
sscanf(ext, "%13s %u", tag_name, &i_nlink);
|
|
if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
|
|
inode->i_nlink = i_nlink;
|
|
}
|
|
}
|
|
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;
|
|
|
|
strncpy(ext, stat->extension, sizeof(ext));
|
|
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:
|
|
P9_DPRINTK(P9_DEBUG_ERROR,
|
|
"Unknown special type %c %s\n", type,
|
|
stat->extension);
|
|
};
|
|
inode->i_rdev = MKDEV(major, minor);
|
|
init_special_inode(inode, inode->i_mode, inode->i_rdev);
|
|
} else
|
|
inode->i_rdev = 0;
|
|
|
|
i_size_write(inode, stat->length);
|
|
|
|
/* not real number of blocks, but 512 byte ones ... */
|
|
inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
|
|
v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
|
|
}
|
|
|
|
/**
|
|
* v9fs_qid2ino - convert qid into inode number
|
|
* @qid: qid to hash
|
|
*
|
|
* BUG: potential for inode number collisions?
|
|
*/
|
|
|
|
ino_t v9fs_qid2ino(struct p9_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;
|
|
|
|
struct v9fs_session_info *v9ses;
|
|
struct p9_fid *fid;
|
|
struct p9_wstat *st;
|
|
|
|
P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
|
|
retval = -EPERM;
|
|
v9ses = v9fs_dentry2v9ses(dentry);
|
|
fid = v9fs_fid_lookup(dentry);
|
|
if (IS_ERR(fid))
|
|
return PTR_ERR(fid);
|
|
|
|
if (!v9fs_proto_dotu(v9ses))
|
|
return -EBADF;
|
|
|
|
st = p9_client_stat(fid);
|
|
if (IS_ERR(st))
|
|
return PTR_ERR(st);
|
|
|
|
if (!(st->mode & P9_DMSYMLINK)) {
|
|
retval = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
/* copy extension buffer into buffer */
|
|
strncpy(buffer, st->extension, buflen);
|
|
|
|
P9_DPRINTK(P9_DEBUG_VFS,
|
|
"%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer);
|
|
|
|
retval = strnlen(buffer, buflen);
|
|
done:
|
|
p9stat_free(st);
|
|
kfree(st);
|
|
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();
|
|
|
|
P9_DPRINTK(P9_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[min(len, PATH_MAX-1)] = 0;
|
|
}
|
|
nd_set_link(nd, link);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_put_link - release a symlink path
|
|
* @dentry: dentry for symlink
|
|
* @nd: nameidata
|
|
* @p: unused
|
|
*
|
|
*/
|
|
|
|
void
|
|
v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
|
|
{
|
|
char *s = nd_get_link(nd);
|
|
|
|
P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name,
|
|
IS_ERR(s) ? "<error>" : s);
|
|
if (!IS_ERR(s))
|
|
__putname(s);
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_mkspecial - create a special file
|
|
* @dir: inode to create special file in
|
|
* @dentry: dentry to create
|
|
* @mode: mode to create special file
|
|
* @extension: 9p2000.u format extension string representing special file
|
|
*
|
|
*/
|
|
|
|
static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
|
|
int mode, const char *extension)
|
|
{
|
|
u32 perm;
|
|
struct p9_fid *fid;
|
|
struct v9fs_session_info *v9ses;
|
|
|
|
v9ses = v9fs_inode2v9ses(dir);
|
|
if (!v9fs_proto_dotu(v9ses)) {
|
|
P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n");
|
|
return -EPERM;
|
|
}
|
|
|
|
perm = unixmode2p9mode(v9ses, mode);
|
|
fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
|
|
P9_OREAD);
|
|
if (IS_ERR(fid))
|
|
return PTR_ERR(fid);
|
|
|
|
v9fs_invalidate_inode_attr(dir);
|
|
p9_client_clunk(fid);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_symlink - helper function to create symlinks
|
|
* @dir: directory inode containing symlink
|
|
* @dentry: dentry for symlink
|
|
* @symname: symlink data
|
|
*
|
|
* See Also: 9P2000.u RFC for more information
|
|
*
|
|
*/
|
|
|
|
static int
|
|
v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
|
|
{
|
|
P9_DPRINTK(P9_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
|
|
*
|
|
*/
|
|
|
|
static int
|
|
v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
|
|
struct dentry *dentry)
|
|
{
|
|
int retval;
|
|
char *name;
|
|
struct p9_fid *oldfid;
|
|
|
|
P9_DPRINTK(P9_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, P9_DMLINK, name);
|
|
__putname(name);
|
|
if (!retval) {
|
|
v9fs_refresh_inode(oldfid, old_dentry->d_inode);
|
|
v9fs_invalidate_inode_attr(dir);
|
|
}
|
|
clunk_fid:
|
|
p9_client_clunk(oldfid);
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_mknod - create a special file
|
|
* @dir: inode destination for new link
|
|
* @dentry: dentry for file
|
|
* @mode: mode for creation
|
|
* @rdev: 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;
|
|
|
|
P9_DPRINTK(P9_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 if (S_ISSOCK(mode))
|
|
*name = 0;
|
|
else {
|
|
__putname(name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
|
|
__putname(name);
|
|
|
|
return retval;
|
|
}
|
|
|
|
int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
|
|
{
|
|
loff_t i_size;
|
|
struct p9_wstat *st;
|
|
struct v9fs_session_info *v9ses;
|
|
|
|
v9ses = v9fs_inode2v9ses(inode);
|
|
st = p9_client_stat(fid);
|
|
if (IS_ERR(st))
|
|
return PTR_ERR(st);
|
|
|
|
spin_lock(&inode->i_lock);
|
|
/*
|
|
* We don't want to refresh inode->i_size,
|
|
* because we may have cached data
|
|
*/
|
|
i_size = inode->i_size;
|
|
v9fs_stat2inode(st, inode, inode->i_sb);
|
|
if (v9ses->cache)
|
|
inode->i_size = i_size;
|
|
spin_unlock(&inode->i_lock);
|
|
p9stat_free(st);
|
|
kfree(st);
|
|
return 0;
|
|
}
|
|
|
|
static const struct inode_operations v9fs_dir_inode_operations_dotu = {
|
|
.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,
|
|
.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 = generic_readlink,
|
|
.follow_link = v9fs_vfs_follow_link,
|
|
.put_link = v9fs_vfs_put_link,
|
|
.getattr = v9fs_vfs_getattr,
|
|
.setattr = v9fs_vfs_setattr,
|
|
};
|
|
|