![Magnus Deininger](/assets/img/avatar_default.png)
In v9fs_get_inode(), for block, as well as char devices (in theory), the function init_special_inode() is called to set up callback functions for file ops. this function uses the file mode's value to determine whether to use block or char dev functions. In v9fs_inode_from_fid(), the function p9mode2unixmode() is used, but for all devices it initially returns S_IFBLK, then uses v9fs_get_inode() to initialise a new inode, then finally uses v9fs_stat2inode(), which would determine whether the inode is a block or character device. However, at that point init_special_inode() had already decided to use the block device functions, so even if the inode's mode is turned to a character device, the block functions are still used to operate on them. The attached patch simply calls init_special_inode() again for devices after parsing device node data in v9fs_stat2inode() so that the proper functions are used. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
1202 lines
25 KiB
C
1202 lines
25 KiB
C
/*
|
|
* linux/fs/9p/vfs_inode.c
|
|
*
|
|
* This file contains vfs inode ops for the 9P2000 protocol.
|
|
*
|
|
* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
|
|
* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to:
|
|
* Free Software Foundation
|
|
* 51 Franklin Street, Fifth Floor
|
|
* Boston, MA 02111-1301 USA
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/file.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/string.h>
|
|
#include <linux/inet.h>
|
|
#include <linux/namei.h>
|
|
#include <linux/idr.h>
|
|
#include <linux/sched.h>
|
|
#include <net/9p/9p.h>
|
|
#include <net/9p/client.h>
|
|
|
|
#include "v9fs.h"
|
|
#include "v9fs_vfs.h"
|
|
#include "fid.h"
|
|
|
|
static const struct inode_operations v9fs_dir_inode_operations;
|
|
static const struct inode_operations v9fs_dir_inode_operations_ext;
|
|
static const struct inode_operations v9fs_file_inode_operations;
|
|
static const struct inode_operations v9fs_symlink_inode_operations;
|
|
|
|
/**
|
|
* unixmode2p9mode - convert unix mode bits to plan 9
|
|
* @v9ses: v9fs session information
|
|
* @mode: mode to convert
|
|
*
|
|
*/
|
|
|
|
static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
|
|
{
|
|
int res;
|
|
res = mode & 0777;
|
|
if (S_ISDIR(mode))
|
|
res |= P9_DMDIR;
|
|
if (v9fs_extended(v9ses)) {
|
|
if (S_ISLNK(mode))
|
|
res |= P9_DMSYMLINK;
|
|
if (v9ses->nodev == 0) {
|
|
if (S_ISSOCK(mode))
|
|
res |= P9_DMSOCKET;
|
|
if (S_ISFIFO(mode))
|
|
res |= P9_DMNAMEDPIPE;
|
|
if (S_ISBLK(mode))
|
|
res |= P9_DMDEVICE;
|
|
if (S_ISCHR(mode))
|
|
res |= P9_DMDEVICE;
|
|
}
|
|
|
|
if ((mode & S_ISUID) == S_ISUID)
|
|
res |= P9_DMSETUID;
|
|
if ((mode & S_ISGID) == S_ISGID)
|
|
res |= P9_DMSETGID;
|
|
if ((mode & S_ISVTX) == S_ISVTX)
|
|
res |= P9_DMSETVTX;
|
|
if ((mode & P9_DMLINK))
|
|
res |= P9_DMLINK;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* p9mode2unixmode- convert plan9 mode bits to unix mode bits
|
|
* @v9ses: v9fs session information
|
|
* @mode: mode to convert
|
|
*
|
|
*/
|
|
|
|
static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
|
|
{
|
|
int res;
|
|
|
|
res = mode & 0777;
|
|
|
|
if ((mode & P9_DMDIR) == P9_DMDIR)
|
|
res |= S_IFDIR;
|
|
else if ((mode & P9_DMSYMLINK) && (v9fs_extended(v9ses)))
|
|
res |= S_IFLNK;
|
|
else if ((mode & P9_DMSOCKET) && (v9fs_extended(v9ses))
|
|
&& (v9ses->nodev == 0))
|
|
res |= S_IFSOCK;
|
|
else if ((mode & P9_DMNAMEDPIPE) && (v9fs_extended(v9ses))
|
|
&& (v9ses->nodev == 0))
|
|
res |= S_IFIFO;
|
|
else if ((mode & P9_DMDEVICE) && (v9fs_extended(v9ses))
|
|
&& (v9ses->nodev == 0))
|
|
res |= S_IFBLK;
|
|
else
|
|
res |= S_IFREG;
|
|
|
|
if (v9fs_extended(v9ses)) {
|
|
if ((mode & P9_DMSETUID) == P9_DMSETUID)
|
|
res |= S_ISUID;
|
|
|
|
if ((mode & P9_DMSETGID) == P9_DMSETGID)
|
|
res |= S_ISGID;
|
|
|
|
if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
|
|
res |= S_ISVTX;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
|
|
* @uflags: flags to convert
|
|
* @extended: if .u extensions are active
|
|
*/
|
|
|
|
int v9fs_uflags2omode(int uflags, int extended)
|
|
{
|
|
int ret;
|
|
|
|
ret = 0;
|
|
switch (uflags&3) {
|
|
default:
|
|
case O_RDONLY:
|
|
ret = P9_OREAD;
|
|
break;
|
|
|
|
case O_WRONLY:
|
|
ret = P9_OWRITE;
|
|
break;
|
|
|
|
case O_RDWR:
|
|
ret = P9_ORDWR;
|
|
break;
|
|
}
|
|
|
|
if (uflags & O_TRUNC)
|
|
ret |= P9_OTRUNC;
|
|
|
|
if (extended) {
|
|
if (uflags & O_EXCL)
|
|
ret |= P9_OEXCL;
|
|
|
|
if (uflags & O_APPEND)
|
|
ret |= P9_OAPPEND;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* v9fs_blank_wstat - helper function to setup a 9P stat structure
|
|
* @v9ses: 9P session info (for determining extended mode)
|
|
* @wstat: structure to initialize
|
|
*
|
|
*/
|
|
|
|
static void
|
|
v9fs_blank_wstat(struct p9_wstat *wstat)
|
|
{
|
|
wstat->type = ~0;
|
|
wstat->dev = ~0;
|
|
wstat->qid.type = ~0;
|
|
wstat->qid.version = ~0;
|
|
*((long long *)&wstat->qid.path) = ~0;
|
|
wstat->mode = ~0;
|
|
wstat->atime = ~0;
|
|
wstat->mtime = ~0;
|
|
wstat->length = ~0;
|
|
wstat->name = NULL;
|
|
wstat->uid = NULL;
|
|
wstat->gid = NULL;
|
|
wstat->muid = NULL;
|
|
wstat->n_uid = ~0;
|
|
wstat->n_gid = ~0;
|
|
wstat->n_muid = ~0;
|
|
wstat->extension = NULL;
|
|
}
|
|
|
|
/**
|
|
* v9fs_get_inode - helper function to setup an inode
|
|
* @sb: superblock
|
|
* @mode: mode to setup inode with
|
|
*
|
|
*/
|
|
|
|
struct inode *v9fs_get_inode(struct super_block *sb, int mode)
|
|
{
|
|
struct inode *inode;
|
|
struct v9fs_session_info *v9ses = sb->s_fs_info;
|
|
|
|
P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
|
|
|
|
inode = new_inode(sb);
|
|
if (inode) {
|
|
inode->i_mode = mode;
|
|
inode->i_uid = current->fsuid;
|
|
inode->i_gid = current->fsgid;
|
|
inode->i_blocks = 0;
|
|
inode->i_rdev = 0;
|
|
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
|
|
inode->i_mapping->a_ops = &v9fs_addr_operations;
|
|
|
|
switch (mode & S_IFMT) {
|
|
case S_IFIFO:
|
|
case S_IFBLK:
|
|
case S_IFCHR:
|
|
case S_IFSOCK:
|
|
if (!v9fs_extended(v9ses)) {
|
|
P9_DPRINTK(P9_DEBUG_ERROR,
|
|
"special files without extended mode\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
init_special_inode(inode, inode->i_mode,
|
|
inode->i_rdev);
|
|
break;
|
|
case S_IFREG:
|
|
inode->i_op = &v9fs_file_inode_operations;
|
|
inode->i_fop = &v9fs_file_operations;
|
|
break;
|
|
case S_IFLNK:
|
|
if (!v9fs_extended(v9ses)) {
|
|
P9_DPRINTK(P9_DEBUG_ERROR,
|
|
"extended modes used w/o 9P2000.u\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
inode->i_op = &v9fs_symlink_inode_operations;
|
|
break;
|
|
case S_IFDIR:
|
|
inc_nlink(inode);
|
|
if (v9fs_extended(v9ses))
|
|
inode->i_op = &v9fs_dir_inode_operations_ext;
|
|
else
|
|
inode->i_op = &v9fs_dir_inode_operations;
|
|
inode->i_fop = &v9fs_dir_operations;
|
|
break;
|
|
default:
|
|
P9_DPRINTK(P9_DEBUG_ERROR,
|
|
"BAD mode 0x%x S_IFMT 0x%x\n",
|
|
mode, mode & S_IFMT);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
} else {
|
|
P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
return inode;
|
|
}
|
|
|
|
/*
|
|
static struct v9fs_fid*
|
|
v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
|
|
{
|
|
int err;
|
|
int nfid;
|
|
struct v9fs_fid *ret;
|
|
struct v9fs_fcall *fcall;
|
|
|
|
nfid = v9fs_get_idpool(&v9ses->fidpool);
|
|
if (nfid < 0) {
|
|
eprintk(KERN_WARNING, "no free fids available\n");
|
|
return ERR_PTR(-ENOSPC);
|
|
}
|
|
|
|
err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
|
|
&fcall);
|
|
|
|
if (err < 0) {
|
|
if (fcall && fcall->id == RWALK)
|
|
goto clunk_fid;
|
|
|
|
PRINT_FCALL_ERROR("walk error", fcall);
|
|
v9fs_put_idpool(nfid, &v9ses->fidpool);
|
|
goto error;
|
|
}
|
|
|
|
kfree(fcall);
|
|
fcall = NULL;
|
|
ret = v9fs_fid_create(v9ses, nfid);
|
|
if (!ret) {
|
|
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_inode_from_fid - populate an inode by issuing a attribute request
|
|
* @v9ses: session information
|
|
* @fid: fid to issue attribute request for
|
|
* @sb: superblock on which to create inode
|
|
*
|
|
*/
|
|
|
|
static struct inode *
|
|
v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
|
|
struct super_block *sb)
|
|
{
|
|
int err, umode;
|
|
struct inode *ret;
|
|
struct p9_wstat *st;
|
|
|
|
ret = NULL;
|
|
st = p9_client_stat(fid);
|
|
if (IS_ERR(st)) {
|
|
err = PTR_ERR(st);
|
|
st = NULL;
|
|
goto error;
|
|
}
|
|
|
|
umode = p9mode2unixmode(v9ses, st->mode);
|
|
ret = v9fs_get_inode(sb, umode);
|
|
if (IS_ERR(ret)) {
|
|
err = PTR_ERR(ret);
|
|
ret = NULL;
|
|
goto error;
|
|
}
|
|
|
|
v9fs_stat2inode(st, ret, sb);
|
|
ret->i_ino = v9fs_qid2ino(&st->qid);
|
|
kfree(st);
|
|
return ret;
|
|
|
|
error:
|
|
kfree(st);
|
|
if (ret)
|
|
iput(ret);
|
|
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
/**
|
|
* v9fs_remove - helper function to remove files and directories
|
|
* @dir: directory inode that is being deleted
|
|
* @file: dentry that is being deleted
|
|
* @rmdir: removing a directory
|
|
*
|
|
*/
|
|
|
|
static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
|
|
{
|
|
struct inode *file_inode;
|
|
struct v9fs_session_info *v9ses;
|
|
struct p9_fid *v9fid;
|
|
|
|
P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
|
|
rmdir);
|
|
|
|
file_inode = file->d_inode;
|
|
v9ses = v9fs_inode2v9ses(file_inode);
|
|
v9fid = v9fs_fid_clone(file);
|
|
if (IS_ERR(v9fid))
|
|
return PTR_ERR(v9fid);
|
|
|
|
return p9_client_remove(v9fid);
|
|
}
|
|
|
|
static int
|
|
v9fs_open_created(struct inode *inode, struct file *file)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* v9fs_create - Create a file
|
|
* @v9ses: session information
|
|
* @dir: directory that dentry is being created in
|
|
* @dentry: dentry that is being created
|
|
* @perm: create permissions
|
|
* @mode: open mode
|
|
* @extension: 9p2000.u extension string to support devices, etc.
|
|
*
|
|
*/
|
|
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_clone(dentry->d_parent);
|
|
if (IS_ERR(dfid)) {
|
|
err = PTR_ERR(dfid);
|
|
P9_DPRINTK(P9_DEBUG_VFS, "fid clone failed %d\n", err);
|
|
dfid = NULL;
|
|
goto error;
|
|
}
|
|
|
|
/* 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);
|
|
ofid = NULL;
|
|
goto error;
|
|
}
|
|
|
|
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, 0);
|
|
if (IS_ERR(fid)) {
|
|
err = PTR_ERR(fid);
|
|
P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
|
|
fid = NULL;
|
|
goto error;
|
|
} else
|
|
dfid = NULL;
|
|
|
|
/* instantiate inode and assign the unopened fid to the dentry */
|
|
inode = v9fs_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;
|
|
}
|
|
|
|
if (v9ses->cache)
|
|
dentry->d_op = &v9fs_cached_dentry_operations;
|
|
else
|
|
dentry->d_op = &v9fs_dentry_operations;
|
|
|
|
d_instantiate(dentry, inode);
|
|
v9fs_fid_add(dentry, fid);
|
|
return ofid;
|
|
|
|
error:
|
|
if (dfid)
|
|
p9_client_clunk(dfid);
|
|
|
|
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 v9fs_session_info *v9ses;
|
|
struct p9_fid *fid;
|
|
struct file *filp;
|
|
|
|
err = 0;
|
|
fid = NULL;
|
|
v9ses = v9fs_inode2v9ses(dir);
|
|
perm = unixmode2p9mode(v9ses, mode);
|
|
if (nd && nd->flags & LOOKUP_OPEN)
|
|
flags = nd->intent.open.flags - 1;
|
|
else
|
|
flags = O_RDWR;
|
|
|
|
fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
|
|
v9fs_uflags2omode(flags, v9fs_extended(v9ses)));
|
|
if (IS_ERR(fid)) {
|
|
err = PTR_ERR(fid);
|
|
fid = NULL;
|
|
goto error;
|
|
}
|
|
|
|
/* if we are opening a file, assign the open fid to the file */
|
|
if (nd && nd->flags & LOOKUP_OPEN) {
|
|
filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created);
|
|
if (IS_ERR(filp)) {
|
|
err = PTR_ERR(filp);
|
|
goto error;
|
|
}
|
|
|
|
filp->private_data = fid;
|
|
} 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 v9fs_session_info *v9ses;
|
|
struct p9_fid *fid;
|
|
|
|
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;
|
|
}
|
|
|
|
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
|
|
*
|
|
*/
|
|
|
|
static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
|
|
struct nameidata *nameidata)
|
|
{
|
|
struct super_block *sb;
|
|
struct v9fs_session_info *v9ses;
|
|
struct 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);
|
|
|
|
sb = dir->i_sb;
|
|
v9ses = v9fs_inode2v9ses(dir);
|
|
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) {
|
|
d_add(dentry, NULL);
|
|
return NULL;
|
|
}
|
|
|
|
return ERR_PTR(result);
|
|
}
|
|
|
|
inode = v9fs_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;
|
|
|
|
if ((fid->qid.version) && (v9ses->cache))
|
|
dentry->d_op = &v9fs_cached_dentry_operations;
|
|
else
|
|
dentry->d_op = &v9fs_dentry_operations;
|
|
|
|
d_add(dentry, inode);
|
|
return NULL;
|
|
|
|
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
|
|
*
|
|
*/
|
|
|
|
static int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
|
|
{
|
|
return v9fs_remove(i, d, 0);
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_rmdir - VFS unlink hook to delete a directory
|
|
* @i: inode that is being unlinked
|
|
* @d: dentry that is being unlinked
|
|
*
|
|
*/
|
|
|
|
static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
|
|
{
|
|
return v9fs_remove(i, d, 1);
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_rename - VFS hook to rename an inode
|
|
* @old_dir: old dir inode
|
|
* @old_dentry: old dentry
|
|
* @new_dir: new dir inode
|
|
* @new_dentry: new dentry
|
|
*
|
|
*/
|
|
|
|
static int
|
|
v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry)
|
|
{
|
|
struct inode *old_inode;
|
|
struct v9fs_session_info *v9ses;
|
|
struct p9_fid *oldfid;
|
|
struct p9_fid *olddirfid;
|
|
struct p9_fid *newdirfid;
|
|
struct p9_wstat wstat;
|
|
int retval;
|
|
|
|
P9_DPRINTK(P9_DEBUG_VFS, "\n");
|
|
retval = 0;
|
|
old_inode = old_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;
|
|
}
|
|
|
|
/* 9P can only handle file rename in the same directory */
|
|
if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) {
|
|
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:
|
|
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_inode2v9ses(dentry->d_inode);
|
|
if (v9ses->cache == CACHE_LOOSE)
|
|
return simple_getattr(mnt, dentry, stat);
|
|
|
|
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);
|
|
|
|
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 = -EPERM;
|
|
v9ses = v9fs_inode2v9ses(dentry->d_inode);
|
|
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_extended(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;
|
|
}
|
|
|
|
retval = p9_client_wstat(fid, &wstat);
|
|
if (retval >= 0)
|
|
retval = inode_setattr(dentry->d_inode, iattr);
|
|
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* 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];
|
|
struct v9fs_session_info *v9ses = sb->s_fs_info;
|
|
|
|
inode->i_nlink = 1;
|
|
|
|
inode->i_atime.tv_sec = stat->atime;
|
|
inode->i_mtime.tv_sec = stat->mtime;
|
|
inode->i_ctime.tv_sec = stat->mtime;
|
|
|
|
inode->i_uid = v9ses->dfltuid;
|
|
inode->i_gid = v9ses->dfltgid;
|
|
|
|
if (v9fs_extended(v9ses)) {
|
|
inode->i_uid = stat->n_uid;
|
|
inode->i_gid = stat->n_gid;
|
|
}
|
|
|
|
inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
|
|
if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
|
|
char type = 0;
|
|
int major = -1;
|
|
int minor = -1;
|
|
|
|
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;
|
|
|
|
inode->i_size = stat->length;
|
|
|
|
/* not real number of blocks, but 512 byte ones ... */
|
|
inode->i_blocks = (inode->i_size + 512 - 1) >> 9;
|
|
}
|
|
|
|
/**
|
|
* 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_inode2v9ses(dentry->d_inode);
|
|
fid = v9fs_fid_lookup(dentry);
|
|
if (IS_ERR(fid))
|
|
return PTR_ERR(fid);
|
|
|
|
if (!v9fs_extended(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 = buflen;
|
|
|
|
done:
|
|
kfree(st);
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_readlink - read a symlink's location
|
|
* @dentry: dentry for symlink
|
|
* @buffer: buffer to load symlink location into
|
|
* @buflen: length of buffer
|
|
*
|
|
*/
|
|
|
|
static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer,
|
|
int buflen)
|
|
{
|
|
int retval;
|
|
int ret;
|
|
char *link = __getname();
|
|
|
|
if (unlikely(!link))
|
|
return -ENOMEM;
|
|
|
|
if (buflen > PATH_MAX)
|
|
buflen = PATH_MAX;
|
|
|
|
P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
|
|
|
|
retval = v9fs_readlink(dentry, link, buflen);
|
|
|
|
if (retval > 0) {
|
|
if ((ret = copy_to_user(buffer, link, retval)) != 0) {
|
|
P9_DPRINTK(P9_DEBUG_ERROR,
|
|
"problem copying to user: %d\n", ret);
|
|
retval = ret;
|
|
}
|
|
}
|
|
|
|
__putname(link);
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_follow_link - follow a symlink path
|
|
* @dentry: dentry for symlink
|
|
* @nd: nameidata
|
|
*
|
|
*/
|
|
|
|
static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
|
|
{
|
|
int len = 0;
|
|
char *link = __getname();
|
|
|
|
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[len] = 0;
|
|
}
|
|
nd_set_link(nd, link);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_put_link - release a symlink path
|
|
* @dentry: dentry for symlink
|
|
* @nd: nameidata
|
|
* @p: unused
|
|
*
|
|
*/
|
|
|
|
static 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, 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 v9fs_session_info *v9ses;
|
|
struct p9_fid *fid;
|
|
|
|
v9ses = v9fs_inode2v9ses(dir);
|
|
if (!v9fs_extended(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);
|
|
|
|
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;
|
|
struct p9_fid *oldfid;
|
|
char *name;
|
|
|
|
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);
|
|
|
|
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 {
|
|
__putname(name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
|
|
__putname(name);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static const struct inode_operations v9fs_dir_inode_operations_ext = {
|
|
.create = v9fs_vfs_create,
|
|
.lookup = v9fs_vfs_lookup,
|
|
.symlink = v9fs_vfs_symlink,
|
|
.link = v9fs_vfs_link,
|
|
.unlink = v9fs_vfs_unlink,
|
|
.mkdir = v9fs_vfs_mkdir,
|
|
.rmdir = v9fs_vfs_rmdir,
|
|
.mknod = v9fs_vfs_mknod,
|
|
.rename = v9fs_vfs_rename,
|
|
.readlink = v9fs_vfs_readlink,
|
|
.getattr = v9fs_vfs_getattr,
|
|
.setattr = v9fs_vfs_setattr,
|
|
};
|
|
|
|
static const struct inode_operations v9fs_dir_inode_operations = {
|
|
.create = v9fs_vfs_create,
|
|
.lookup = v9fs_vfs_lookup,
|
|
.unlink = v9fs_vfs_unlink,
|
|
.mkdir = v9fs_vfs_mkdir,
|
|
.rmdir = v9fs_vfs_rmdir,
|
|
.mknod = v9fs_vfs_mknod,
|
|
.rename = v9fs_vfs_rename,
|
|
.getattr = v9fs_vfs_getattr,
|
|
.setattr = v9fs_vfs_setattr,
|
|
};
|
|
|
|
static const struct inode_operations v9fs_file_inode_operations = {
|
|
.getattr = v9fs_vfs_getattr,
|
|
.setattr = v9fs_vfs_setattr,
|
|
};
|
|
|
|
static const struct inode_operations v9fs_symlink_inode_operations = {
|
|
.readlink = v9fs_vfs_readlink,
|
|
.follow_link = v9fs_vfs_follow_link,
|
|
.put_link = v9fs_vfs_put_link,
|
|
.getattr = v9fs_vfs_getattr,
|
|
.setattr = v9fs_vfs_setattr,
|
|
};
|