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![David Howells](/assets/img/avatar_default.png)
Convert the following where appropriate: (1) S_ISLNK(dentry->d_inode) to d_is_symlink(dentry). (2) S_ISREG(dentry->d_inode) to d_is_reg(dentry). (3) S_ISDIR(dentry->d_inode) to d_is_dir(dentry). This is actually more complicated than it appears as some calls should be converted to d_can_lookup() instead. The difference is whether the directory in question is a real dir with a ->lookup op or whether it's a fake dir with a ->d_automount op. In some circumstances, we can subsume checks for dentry->d_inode not being NULL into this, provided we the code isn't in a filesystem that expects d_inode to be NULL if the dirent really *is* negative (ie. if we're going to use d_inode() rather than d_backing_inode() to get the inode pointer). Note that the dentry type field may be set to something other than DCACHE_MISS_TYPE when d_inode is NULL in the case of unionmount, where the VFS manages the fall-through from a negative dentry to a lower layer. In such a case, the dentry type of the negative union dentry is set to the same as the type of the lower dentry. However, if you know d_inode is not NULL at the call site, then you can use the d_is_xxx() functions even in a filesystem. There is one further complication: a 0,0 chardev dentry may be labelled DCACHE_WHITEOUT_TYPE rather than DCACHE_SPECIAL_TYPE. Strictly, this was intended for special directory entry types that don't have attached inodes. The following perl+coccinelle script was used: use strict; my @callers; open($fd, 'git grep -l \'S_IS[A-Z].*->d_inode\' |') || die "Can't grep for S_ISDIR and co. callers"; @callers = <$fd>; close($fd); unless (@callers) { print "No matches\n"; exit(0); } my @cocci = ( '@@', 'expression E;', '@@', '', '- S_ISLNK(E->d_inode->i_mode)', '+ d_is_symlink(E)', '', '@@', 'expression E;', '@@', '', '- S_ISDIR(E->d_inode->i_mode)', '+ d_is_dir(E)', '', '@@', 'expression E;', '@@', '', '- S_ISREG(E->d_inode->i_mode)', '+ d_is_reg(E)' ); my $coccifile = "tmp.sp.cocci"; open($fd, ">$coccifile") || die $coccifile; print($fd "$_\n") || die $coccifile foreach (@cocci); close($fd); foreach my $file (@callers) { chomp $file; print "Processing ", $file, "\n"; system("spatch", "--sp-file", $coccifile, $file, "--in-place", "--no-show-diff") == 0 || die "spatch failed"; } [AV: overlayfs parts skipped] Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
1537 lines
34 KiB
C
1537 lines
34 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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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 u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t 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 (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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}
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return res;
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}
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/**
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* p9mode2perm- convert plan9 mode bits to unix permission bits
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* @v9ses: v9fs session information
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* @stat: p9_wstat from which mode need to be derived
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*
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*/
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static int p9mode2perm(struct v9fs_session_info *v9ses,
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struct p9_wstat *stat)
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{
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int res;
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int mode = stat->mode;
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res = mode & S_IALLUGO;
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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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* p9mode2unixmode- convert plan9 mode bits to unix mode bits
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* @v9ses: v9fs session information
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* @stat: p9_wstat from which mode need to be derived
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* @rdev: major number, minor number in case of device files.
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*
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*/
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static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses,
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struct p9_wstat *stat, dev_t *rdev)
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{
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int res;
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u32 mode = stat->mode;
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*rdev = 0;
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res = p9mode2perm(v9ses, stat);
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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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char type = 0, ext[32];
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int major = -1, minor = -1;
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strlcpy(ext, stat->extension, sizeof(ext));
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sscanf(ext, "%c %i %i", &type, &major, &minor);
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switch (type) {
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case 'c':
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res |= S_IFCHR;
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break;
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case 'b':
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res |= S_IFBLK;
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break;
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default:
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p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n",
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type, stat->extension);
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};
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*rdev = MKDEV(major, minor);
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} else
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res |= S_IFREG;
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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 (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 = INVALID_UID;
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wstat->n_gid = INVALID_GID;
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wstat->n_muid = INVALID_UID;
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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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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, umode_t mode, dev_t rdev)
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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 = rdev;
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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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} else if (v9fs_proto_dotu(v9ses)) {
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inode->i_op = &v9fs_file_inode_operations;
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} else {
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p9_debug(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 == CACHE_LOOSE ||
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v9ses->cache == CACHE_FSCACHE)
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inode->i_fop =
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&v9fs_cached_file_operations_dotl;
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else if (v9ses->cache == CACHE_MMAP)
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inode->i_fop = &v9fs_mmap_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 == CACHE_LOOSE ||
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v9ses->cache == CACHE_FSCACHE)
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inode->i_fop =
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&v9fs_cached_file_operations;
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else if (v9ses->cache == CACHE_MMAP)
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inode->i_fop = &v9fs_mmap_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_debug(P9_DEBUG_ERROR,
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"extended modes used with 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_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx 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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* 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, umode_t mode, dev_t rdev)
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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_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode);
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inode = new_inode(sb);
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if (!inode) {
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pr_warn("%s (%d): Problem allocating inode\n",
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__func__, task_pid_nr(current));
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return ERR_PTR(-ENOMEM);
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}
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err = v9fs_init_inode(v9ses, inode, mode, rdev);
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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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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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}
|
|
|
|
kfree(fcall);
|
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fcall = NULL;
|
|
ret = v9fs_fid_create(v9ses, nfid);
|
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if (!ret) {
|
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err = -ENOMEM;
|
|
goto clunk_fid;
|
|
}
|
|
|
|
err = v9fs_fid_insert(ret, dentry);
|
|
if (err < 0) {
|
|
v9fs_fid_destroy(ret);
|
|
goto clunk_fid;
|
|
}
|
|
|
|
return ret;
|
|
|
|
clunk_fid:
|
|
v9fs_t_clunk(v9ses, nfid);
|
|
|
|
error:
|
|
kfree(fcall);
|
|
return ERR_PTR(err);
|
|
}
|
|
*/
|
|
|
|
|
|
/**
|
|
* v9fs_clear_inode - release an inode
|
|
* @inode: inode to release
|
|
*
|
|
*/
|
|
void v9fs_evict_inode(struct inode *inode)
|
|
{
|
|
struct v9fs_inode *v9inode = V9FS_I(inode);
|
|
|
|
truncate_inode_pages_final(inode->i_mapping);
|
|
clear_inode(inode);
|
|
filemap_fdatawrite(inode->i_mapping);
|
|
|
|
v9fs_cache_inode_put_cookie(inode);
|
|
/* 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;
|
|
dev_t rdev;
|
|
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, &rdev);
|
|
/* 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)
|
|
{
|
|
dev_t rdev;
|
|
int retval;
|
|
umode_t 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, &rdev);
|
|
retval = v9fs_init_inode(v9ses, inode, umode, rdev);
|
|
if (retval)
|
|
goto error;
|
|
|
|
v9fs_stat2inode(st, inode, sb);
|
|
v9fs_cache_inode_get_cookie(inode);
|
|
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_at_to_dotl_flags- convert Linux specific AT flags to
|
|
* plan 9 AT flag.
|
|
* @flags: flags to convert
|
|
*/
|
|
static int v9fs_at_to_dotl_flags(int flags)
|
|
{
|
|
int rflags = 0;
|
|
if (flags & AT_REMOVEDIR)
|
|
rflags |= P9_DOTL_AT_REMOVEDIR;
|
|
return rflags;
|
|
}
|
|
|
|
/**
|
|
* v9fs_remove - helper function to remove files and directories
|
|
* @dir: directory inode that is being deleted
|
|
* @dentry: dentry that is being deleted
|
|
* @flags: 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_debug(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_debug(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,
|
|
v9fs_at_to_dotl_flags(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_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
|
|
|
|
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_debug(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_debug(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_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
|
|
goto error;
|
|
}
|
|
|
|
if (!(perm & P9_DMLINK)) {
|
|
/* 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_debug(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_debug(P9_DEBUG_VFS,
|
|
"inode creation failed %d\n", err);
|
|
goto error;
|
|
}
|
|
v9fs_fid_add(dentry, fid);
|
|
d_instantiate(dentry, inode);
|
|
}
|
|
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 a regular file
|
|
*
|
|
* open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called
|
|
* for mknod(2).
|
|
*
|
|
* @dir: directory inode that is being created
|
|
* @dentry: dentry that is being deleted
|
|
* @mode: create permissions
|
|
*
|
|
*/
|
|
|
|
static int
|
|
v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
|
|
bool excl)
|
|
{
|
|
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
|
|
u32 perm = unixmode2p9mode(v9ses, mode);
|
|
struct p9_fid *fid;
|
|
|
|
/* P9_OEXCL? */
|
|
fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR);
|
|
if (IS_ERR(fid))
|
|
return PTR_ERR(fid);
|
|
|
|
v9fs_invalidate_inode_attr(dir);
|
|
p9_client_clunk(fid);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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, umode_t mode)
|
|
{
|
|
int err;
|
|
u32 perm;
|
|
struct p9_fid *fid;
|
|
struct v9fs_session_info *v9ses;
|
|
|
|
p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
|
|
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?
|
|
* @flags: lookup flags (unused)
|
|
*
|
|
*/
|
|
|
|
struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
|
|
unsigned int flags)
|
|
{
|
|
struct dentry *res;
|
|
struct v9fs_session_info *v9ses;
|
|
struct p9_fid *dfid, *fid;
|
|
struct inode *inode;
|
|
char *name;
|
|
|
|
p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n",
|
|
dir, dentry, dentry, flags);
|
|
|
|
if (dentry->d_name.len > NAME_MAX)
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
|
|
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)) {
|
|
if (fid == ERR_PTR(-ENOENT)) {
|
|
d_add(dentry, NULL);
|
|
return NULL;
|
|
}
|
|
return ERR_CAST(fid);
|
|
}
|
|
/*
|
|
* Make sure we don't use a wrong inode due to parallel
|
|
* unlink. For cached mode create calls request for new
|
|
* inode. But with cache disabled, lookup should do this.
|
|
*/
|
|
if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
|
|
inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
|
|
else
|
|
inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
|
|
if (IS_ERR(inode)) {
|
|
p9_client_clunk(fid);
|
|
return ERR_CAST(inode);
|
|
}
|
|
/*
|
|
* If we had a rename on the server and a parallel lookup
|
|
* for the new name, then make sure we instantiate with
|
|
* the new name. ie look up for a/b, while on server somebody
|
|
* moved b under k and client parallely did a lookup for
|
|
* k/b.
|
|
*/
|
|
res = d_splice_alias(inode, dentry);
|
|
if (!res)
|
|
v9fs_fid_add(dentry, fid);
|
|
else if (!IS_ERR(res))
|
|
v9fs_fid_add(res, fid);
|
|
else
|
|
p9_client_clunk(fid);
|
|
return res;
|
|
}
|
|
|
|
static int
|
|
v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
|
|
struct file *file, unsigned flags, umode_t mode,
|
|
int *opened)
|
|
{
|
|
int err;
|
|
u32 perm;
|
|
struct v9fs_inode *v9inode;
|
|
struct v9fs_session_info *v9ses;
|
|
struct p9_fid *fid, *inode_fid;
|
|
struct dentry *res = NULL;
|
|
|
|
if (d_unhashed(dentry)) {
|
|
res = v9fs_vfs_lookup(dir, dentry, 0);
|
|
if (IS_ERR(res))
|
|
return PTR_ERR(res);
|
|
|
|
if (res)
|
|
dentry = res;
|
|
}
|
|
|
|
/* Only creates */
|
|
if (!(flags & O_CREAT) || dentry->d_inode)
|
|
return finish_no_open(file, res);
|
|
|
|
err = 0;
|
|
|
|
v9ses = v9fs_inode2v9ses(dir);
|
|
perm = unixmode2p9mode(v9ses, mode);
|
|
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);
|
|
v9inode = V9FS_I(dentry->d_inode);
|
|
mutex_lock(&v9inode->v_mutex);
|
|
if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
|
|
!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);
|
|
err = finish_open(file, dentry, generic_file_open, opened);
|
|
if (err)
|
|
goto error;
|
|
|
|
file->private_data = fid;
|
|
if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
|
|
v9fs_cache_inode_set_cookie(dentry->d_inode, file);
|
|
|
|
*opened |= FILE_CREATED;
|
|
out:
|
|
dput(res);
|
|
return err;
|
|
|
|
error:
|
|
if (fid)
|
|
p9_client_clunk(fid);
|
|
goto out;
|
|
}
|
|
|
|
/**
|
|
* 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_debug(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_debug(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)
|
|
{
|
|
struct v9fs_session_info *v9ses;
|
|
struct p9_fid *fid;
|
|
struct p9_wstat *st;
|
|
|
|
p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
|
|
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_debug(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 (d_is_reg(dentry))
|
|
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)
|
|
{
|
|
umode_t mode;
|
|
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);
|
|
|
|
set_nlink(inode, 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
|
|
*/
|
|
strlcpy(ext, stat->extension, sizeof(ext));
|
|
/* HARDLINKCOUNT %u */
|
|
sscanf(ext, "%13s %u", tag_name, &i_nlink);
|
|
if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
|
|
set_nlink(inode, i_nlink);
|
|
}
|
|
}
|
|
mode = p9mode2perm(v9ses, stat);
|
|
mode |= inode->i_mode & ~S_IALLUGO;
|
|
inode->i_mode = mode;
|
|
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_debug(P9_DEBUG_VFS, " %pd\n", dentry);
|
|
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 */
|
|
retval = min(strlen(st->extension)+1, (size_t)buflen);
|
|
memcpy(buffer, st->extension, retval);
|
|
|
|
p9_debug(P9_DEBUG_VFS, "%pd -> %s (%.*s)\n",
|
|
dentry, st->extension, buflen, buffer);
|
|
|
|
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_debug(P9_DEBUG_VFS, "%pd\n", dentry);
|
|
|
|
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_debug(P9_DEBUG_VFS, " %pd %s\n",
|
|
dentry, 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
|
|
* @perm: 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,
|
|
u32 perm, const char *extension)
|
|
{
|
|
struct p9_fid *fid;
|
|
struct v9fs_session_info *v9ses;
|
|
|
|
v9ses = v9fs_inode2v9ses(dir);
|
|
if (!v9fs_proto_dotu(v9ses)) {
|
|
p9_debug(P9_DEBUG_ERROR, "not extended\n");
|
|
return -EPERM;
|
|
}
|
|
|
|
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_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n",
|
|
dir->i_ino, dentry, symname);
|
|
|
|
return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, 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_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n",
|
|
dir->i_ino, dentry, old_dentry);
|
|
|
|
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, umode_t mode, dev_t rdev)
|
|
{
|
|
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
|
|
int retval;
|
|
char *name;
|
|
u32 perm;
|
|
|
|
p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
|
|
dir->i_ino, dentry, 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;
|
|
}
|
|
|
|
perm = unixmode2p9mode(v9ses, mode);
|
|
retval = v9fs_vfs_mkspecial(dir, dentry, perm, name);
|
|
__putname(name);
|
|
|
|
return retval;
|
|
}
|
|
|
|
int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
|
|
{
|
|
int umode;
|
|
dev_t rdev;
|
|
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);
|
|
/*
|
|
* Don't update inode if the file type is different
|
|
*/
|
|
umode = p9mode2unixmode(v9ses, st, &rdev);
|
|
if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
|
|
goto out;
|
|
|
|
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 == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
|
|
inode->i_size = i_size;
|
|
spin_unlock(&inode->i_lock);
|
|
out:
|
|
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,
|
|
.atomic_open = v9fs_vfs_atomic_open,
|
|
.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,
|
|
.atomic_open = v9fs_vfs_atomic_open,
|
|
.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,
|
|
};
|
|
|