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vfs_inode.c
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/*
* linux/fs/9p/vfs_inode.c
*
* This file contains vfs inode ops for the 9P2000 protocol.
*
* Copyright (C) 2004 by Eric Van Hensbergen <[email protected]>
* Copyright (C) 2002 by Ron Minnich <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 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/smp_lock.h>
#include <linux/inet.h>
#include <linux/namei.h>
#include <linux/idr.h>
#include "debug.h"
#include "v9fs.h"
#include "9p.h"
#include "v9fs_vfs.h"
#include "fid.h"
static struct inode_operations v9fs_dir_inode_operations;
static struct inode_operations v9fs_dir_inode_operations_ext;
static struct inode_operations v9fs_file_inode_operations;
static 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 |= V9FS_DMDIR;
if (v9ses->extended) {
if (S_ISLNK(mode))
res |= V9FS_DMSYMLINK;
if (v9ses->nodev == 0) {
if (S_ISSOCK(mode))
res |= V9FS_DMSOCKET;
if (S_ISFIFO(mode))
res |= V9FS_DMNAMEDPIPE;
if (S_ISBLK(mode))
res |= V9FS_DMDEVICE;
if (S_ISCHR(mode))
res |= V9FS_DMDEVICE;
}
if ((mode & S_ISUID) == S_ISUID)
res |= V9FS_DMSETUID;
if ((mode & S_ISGID) == S_ISGID)
res |= V9FS_DMSETGID;
if ((mode & V9FS_DMLINK))
res |= V9FS_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 & V9FS_DMDIR) == V9FS_DMDIR)
res |= S_IFDIR;
else if ((mode & V9FS_DMSYMLINK) && (v9ses->extended))
res |= S_IFLNK;
else if ((mode & V9FS_DMSOCKET) && (v9ses->extended)
&& (v9ses->nodev == 0))
res |= S_IFSOCK;
else if ((mode & V9FS_DMNAMEDPIPE) && (v9ses->extended)
&& (v9ses->nodev == 0))
res |= S_IFIFO;
else if ((mode & V9FS_DMDEVICE) && (v9ses->extended)
&& (v9ses->nodev == 0))
res |= S_IFBLK;
else
res |= S_IFREG;
if (v9ses->extended) {
if ((mode & V9FS_DMSETUID) == V9FS_DMSETUID)
res |= S_ISUID;
if ((mode & V9FS_DMSETGID) == V9FS_DMSETGID)
res |= S_ISGID;
}
return res;
}
/**
* 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 v9fs_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 = NULL;
struct v9fs_session_info *v9ses = sb->s_fs_info;
dprintk(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_blksize = sb->s_blocksize;
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(!v9ses->extended) {
dprintk(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(!v9ses->extended) {
dprintk(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:
inode->i_nlink++;
if(v9ses->extended)
inode->i_op = &v9fs_dir_inode_operations_ext;
else
inode->i_op = &v9fs_dir_inode_operations;
inode->i_fop = &v9fs_dir_operations;
break;
default:
dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
mode, mode & S_IFMT);
return ERR_PTR(-EINVAL);
}
} else {
eprintk(KERN_WARNING, "Problem allocating inode\n");
return ERR_PTR(-ENOMEM);
}
return inode;
}
/**
* v9fs_create - helper function to create files and directories
* @dir: directory inode file is being created in
* @file_dentry: dentry file is being created in
* @perm: permissions file is being created with
* @open_mode: resulting open mode for file
*
*/
static int
v9fs_create(struct inode *dir,
struct dentry *file_dentry,
unsigned int perm, unsigned int open_mode)
{
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
struct super_block *sb = dir->i_sb;
struct v9fs_fid *dirfid =
v9fs_fid_lookup(file_dentry->d_parent);
struct v9fs_fid *fid = NULL;
struct inode *file_inode = NULL;
struct v9fs_fcall *fcall = NULL;
struct v9fs_qid qid;
int dirfidnum = -1;
long newfid = -1;
int result = 0;
unsigned int iounit = 0;
int wfidno = -1;
int err;
perm = unixmode2p9mode(v9ses, perm);
dprintk(DEBUG_VFS, "dir: %p dentry: %p perm: %o mode: %o\n", dir,
file_dentry, perm, open_mode);
if (!dirfid)
return -EBADF;
dirfidnum = dirfid->fid;
if (dirfidnum < 0) {
dprintk(DEBUG_ERROR, "No fid for the directory #%lu\n",
dir->i_ino);
return -EBADF;
}
if (file_dentry->d_inode) {
dprintk(DEBUG_ERROR,
"Odd. There is an inode for dir %lu, name :%s:\n",
dir->i_ino, file_dentry->d_name.name);
return -EEXIST;
}
newfid = v9fs_get_idpool(&v9ses->fidpool);
if (newfid < 0) {
eprintk(KERN_WARNING, "no free fids available\n");
return -ENOSPC;
}
result = v9fs_t_walk(v9ses, dirfidnum, newfid, NULL, &fcall);
if (result < 0) {
PRINT_FCALL_ERROR("clone error", fcall);
v9fs_put_idpool(newfid, &v9ses->fidpool);
newfid = -1;
goto CleanUpFid;
}
kfree(fcall);
fcall = NULL;
result = v9fs_t_create(v9ses, newfid, (char *)file_dentry->d_name.name,
perm, open_mode, &fcall);
if (result < 0) {
PRINT_FCALL_ERROR("create fails", fcall);
goto CleanUpFid;
}
iounit = fcall->params.rcreate.iounit;
qid = fcall->params.rcreate.qid;
kfree(fcall);
fcall = NULL;
if (!(perm&V9FS_DMDIR)) {
fid = v9fs_fid_create(file_dentry, v9ses, newfid, 1);
dprintk(DEBUG_VFS, "fid %p %d\n", fid, fid->fidcreate);
if (!fid) {
result = -ENOMEM;
goto CleanUpFid;
}
fid->qid = qid;
fid->iounit = iounit;
} else {
err = v9fs_t_clunk(v9ses, newfid);
newfid = -1;
if (err < 0)
dprintk(DEBUG_ERROR, "clunk for mkdir failed: %d\n", err);
}
/* walk to the newly created file and put the fid in the dentry */
wfidno = v9fs_get_idpool(&v9ses->fidpool);
if (wfidno < 0) {
eprintk(KERN_WARNING, "no free fids available\n");
return -ENOSPC;
}
result = v9fs_t_walk(v9ses, dirfidnum, wfidno,
(char *) file_dentry->d_name.name, &fcall);
if (result < 0) {
PRINT_FCALL_ERROR("clone error", fcall);
v9fs_put_idpool(wfidno, &v9ses->fidpool);
wfidno = -1;
goto CleanUpFid;
}
kfree(fcall);
fcall = NULL;
if (!v9fs_fid_create(file_dentry, v9ses, wfidno, 0)) {
v9fs_put_idpool(wfidno, &v9ses->fidpool);
goto CleanUpFid;
}
if ((perm & V9FS_DMSYMLINK) || (perm & V9FS_DMLINK) ||
(perm & V9FS_DMNAMEDPIPE) || (perm & V9FS_DMSOCKET) ||
(perm & V9FS_DMDEVICE))
return 0;
result = v9fs_t_stat(v9ses, wfidno, &fcall);
if (result < 0) {
PRINT_FCALL_ERROR("stat error", fcall);
goto CleanUpFid;
}
file_inode = v9fs_get_inode(sb,
p9mode2unixmode(v9ses, fcall->params.rstat.stat.mode));
if ((!file_inode) || IS_ERR(file_inode)) {
dprintk(DEBUG_ERROR, "create inode failed\n");
result = -EBADF;
goto CleanUpFid;
}
v9fs_stat2inode(&fcall->params.rstat.stat, file_inode, sb);
kfree(fcall);
fcall = NULL;
file_dentry->d_op = &v9fs_dentry_operations;
d_instantiate(file_dentry, file_inode);
return 0;
CleanUpFid:
kfree(fcall);
fcall = NULL;
if (newfid >= 0) {
err = v9fs_t_clunk(v9ses, newfid);
if (err < 0)
dprintk(DEBUG_ERROR, "clunk failed: %d\n", err);
}
if (wfidno >= 0) {
err = v9fs_t_clunk(v9ses, wfidno);
if (err < 0)
dprintk(DEBUG_ERROR, "clunk failed: %d\n", err);
}
return result;
}
/**
* 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 v9fs_fcall *fcall = NULL;
struct super_block *sb = NULL;
struct v9fs_session_info *v9ses = NULL;
struct v9fs_fid *v9fid = NULL;
struct inode *file_inode = NULL;
int fid = -1;
int result = 0;
dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
rmdir);
file_inode = file->d_inode;
sb = file_inode->i_sb;
v9ses = v9fs_inode2v9ses(file_inode);
v9fid = v9fs_fid_lookup(file);
if (!v9fid) {
dprintk(DEBUG_ERROR,
"no v9fs_fid\n");
return -EBADF;
}
fid = v9fid->fid;
if (fid < 0) {
dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n",
file_inode->i_ino);
return -EBADF;
}
result = v9fs_t_remove(v9ses, fid, &fcall);
if (result < 0) {
PRINT_FCALL_ERROR("remove fails", fcall);
} else {
v9fs_put_idpool(fid, &v9ses->fidpool);
v9fs_fid_destroy(v9fid);
}
kfree(fcall);
return result;
}
/**
* v9fs_vfs_create - VFS hook to create files
* @inode: directory inode that is being deleted
* @dentry: dentry that is being deleted
* @perm: create permissions
* @nd: path information
*
*/
static int
v9fs_vfs_create(struct inode *inode, struct dentry *dentry, int perm,
struct nameidata *nd)
{
return v9fs_create(inode, dentry, perm, O_RDWR);
}
/**
* v9fs_vfs_mkdir - VFS mkdir hook to create a directory
* @inode: inode that is being unlinked
* @dentry: dentry that is being unlinked
* @mode: mode for new directory
*
*/
static int v9fs_vfs_mkdir(struct inode *inode, struct dentry *dentry, int mode)
{
return v9fs_create(inode, dentry, mode | S_IFDIR, O_RDONLY);
}
/**
* v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
* @dir: inode that is being walked from
* @dentry: dentry that is being walked to?
* @nameidata: path data
*
*/
static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nameidata)
{
struct super_block *sb;
struct v9fs_session_info *v9ses;
struct v9fs_fid *dirfid;
struct v9fs_fid *fid;
struct inode *inode;
struct v9fs_fcall *fcall = NULL;
int dirfidnum = -1;
int newfid = -1;
int result = 0;
dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
dir, dentry->d_iname, dentry, nameidata);
sb = dir->i_sb;
v9ses = v9fs_inode2v9ses(dir);
dirfid = v9fs_fid_lookup(dentry->d_parent);
if (!dirfid) {
dprintk(DEBUG_ERROR, "no dirfid\n");
return ERR_PTR(-EINVAL);
}
dirfidnum = dirfid->fid;
if (dirfidnum < 0) {
dprintk(DEBUG_ERROR, "no dirfid for inode %p, #%lu\n",
dir, dir->i_ino);
return ERR_PTR(-EBADF);
}
newfid = v9fs_get_idpool(&v9ses->fidpool);
if (newfid < 0) {
eprintk(KERN_WARNING, "newfid fails!\n");
return ERR_PTR(-ENOSPC);
}
result =
v9fs_t_walk(v9ses, dirfidnum, newfid, (char *)dentry->d_name.name,
NULL);
if (result < 0) {
v9fs_put_idpool(newfid, &v9ses->fidpool);
if (result == -ENOENT) {
d_add(dentry, NULL);
dprintk(DEBUG_VFS,
"Return negative dentry %p count %d\n",
dentry, atomic_read(&dentry->d_count));
return NULL;
}
dprintk(DEBUG_ERROR, "walk error:%d\n", result);
goto FreeFcall;
}
result = v9fs_t_stat(v9ses, newfid, &fcall);
if (result < 0) {
dprintk(DEBUG_ERROR, "stat error\n");
goto FreeFcall;
}
inode = v9fs_get_inode(sb, p9mode2unixmode(v9ses,
fcall->params.rstat.stat.mode));
if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) {
eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n",
PTR_ERR(inode));
result = -ENOSPC;
goto FreeFcall;
}
inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat.qid);
fid = v9fs_fid_create(dentry, v9ses, newfid, 0);
if (fid == NULL) {
dprintk(DEBUG_ERROR, "couldn't insert\n");
result = -ENOMEM;
goto FreeFcall;
}
fid->qid = fcall->params.rstat.stat.qid;
dentry->d_op = &v9fs_dentry_operations;
v9fs_stat2inode(&fcall->params.rstat.stat, inode, inode->i_sb);
d_add(dentry, inode);
kfree(fcall);
return NULL;
FreeFcall:
kfree(fcall);
return ERR_PTR(result);
}
/**
* v9fs_vfs_unlink - VFS unlink hook to delete an inode
* @i: inode that is being unlinked
* @d: dentry that is being unlinked
*
*/
static int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
{
return v9fs_remove(i, d, 0);
}
/**
* v9fs_vfs_rmdir - VFS unlink hook to delete a directory
* @i: inode that is being unlinked
* @d: dentry that is being unlinked
*
*/
static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
{
return v9fs_remove(i, d, 1);
}
/**
* v9fs_vfs_rename - VFS hook to rename an inode
* @old_dir: old dir inode
* @old_dentry: old dentry
* @new_dir: new dir inode
* @new_dentry: new dentry
*
*/
static int
v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
struct inode *old_inode = old_dentry->d_inode;
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode);
struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry);
struct v9fs_fid *olddirfid =
v9fs_fid_lookup(old_dentry->d_parent);
struct v9fs_fid *newdirfid =
v9fs_fid_lookup(new_dentry->d_parent);
struct v9fs_wstat wstat;
struct v9fs_fcall *fcall = NULL;
int fid = -1;
int olddirfidnum = -1;
int newdirfidnum = -1;
int retval = 0;
dprintk(DEBUG_VFS, "\n");
if ((!oldfid) || (!olddirfid) || (!newdirfid)) {
dprintk(DEBUG_ERROR, "problem with arguments\n");
return -EBADF;
}
/* 9P can only handle file rename in the same directory */
if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) {
dprintk(DEBUG_ERROR, "old dir and new dir are different\n");
retval = -EPERM;
goto FreeFcallnBail;
}
fid = oldfid->fid;
olddirfidnum = olddirfid->fid;
newdirfidnum = newdirfid->fid;
if (fid < 0) {
dprintk(DEBUG_ERROR, "no fid for old file #%lu\n",
old_inode->i_ino);
retval = -EBADF;
goto FreeFcallnBail;
}
v9fs_blank_wstat(&wstat);
wstat.muid = v9ses->name;
wstat.name = (char *) new_dentry->d_name.name;
retval = v9fs_t_wstat(v9ses, fid, &wstat, &fcall);
FreeFcallnBail:
if (retval < 0)
PRINT_FCALL_ERROR("wstat error", fcall);
kfree(fcall);
return retval;
}
/**
* v9fs_vfs_getattr - retrieve file metadata
* @mnt - mount information
* @dentry - file to get attributes on
* @stat - metadata structure to populate
*
*/
static int
v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
struct kstat *stat)
{
struct v9fs_fcall *fcall = NULL;
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
struct v9fs_fid *fid = v9fs_fid_lookup(dentry);
int err = -EPERM;
dprintk(DEBUG_VFS, "dentry: %p\n", dentry);
if (!fid) {
dprintk(DEBUG_ERROR,
"couldn't find fid associated with dentry\n");
return -EBADF;
}
err = v9fs_t_stat(v9ses, fid->fid, &fcall);
if (err < 0)
dprintk(DEBUG_ERROR, "stat error\n");
else {
v9fs_stat2inode(&fcall->params.rstat.stat, dentry->d_inode,
dentry->d_inode->i_sb);
generic_fillattr(dentry->d_inode, stat);
}
kfree(fcall);
return err;
}
/**
* v9fs_vfs_setattr - set file metadata
* @dentry: file whose metadata to set
* @iattr: metadata assignment structure
*
*/
static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
{
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
struct v9fs_fid *fid = v9fs_fid_lookup(dentry);
struct v9fs_fcall *fcall = NULL;
struct v9fs_wstat wstat;
int res = -EPERM;
dprintk(DEBUG_VFS, "\n");
if (!fid) {
dprintk(DEBUG_ERROR,
"Couldn't find fid associated with dentry\n");
return -EBADF;
}
v9fs_blank_wstat(&wstat);
if (iattr->ia_valid & ATTR_MODE)
wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
if (iattr->ia_valid & ATTR_MTIME)
wstat.mtime = iattr->ia_mtime.tv_sec;
if (iattr->ia_valid & ATTR_ATIME)
wstat.atime = iattr->ia_atime.tv_sec;
if (iattr->ia_valid & ATTR_SIZE)
wstat.length = iattr->ia_size;
if (v9ses->extended) {
if (iattr->ia_valid & ATTR_UID)
wstat.n_uid = iattr->ia_uid;
if (iattr->ia_valid & ATTR_GID)
wstat.n_gid = iattr->ia_gid;
}
res = v9fs_t_wstat(v9ses, fid->fid, &wstat, &fcall);
if (res < 0)
PRINT_FCALL_ERROR("wstat error", fcall);
kfree(fcall);
if (res >= 0)
res = inode_setattr(dentry->d_inode, iattr);
return res;
}
/**
* v9fs_stat2inode - populate an inode structure with mistat info
* @stat: Plan 9 metadata (mistat) structure
* @inode: inode to populate
* @sb: superblock of filesystem
*
*/
void
v9fs_stat2inode(struct v9fs_stat *stat, struct inode *inode,
struct super_block *sb)
{
int n;
char ext[32];
struct v9fs_session_info *v9ses = sb->s_fs_info;
inode->i_nlink = 1;
inode->i_atime.tv_sec = stat->atime;
inode->i_mtime.tv_sec = stat->mtime;
inode->i_ctime.tv_sec = stat->mtime;
inode->i_uid = v9ses->uid;
inode->i_gid = v9ses->gid;
if (v9ses->extended) {
inode->i_uid = stat->n_uid;
inode->i_gid = stat->n_gid;
}
inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
char type = 0;
int major = -1;
int minor = -1;
n = stat->extension.len;
if (n > sizeof(ext)-1)
n = sizeof(ext)-1;
memmove(ext, stat->extension.str, n);
ext[n] = 0;
sscanf(ext, "%c %u %u", &type, &major, &minor);
switch (type) {
case 'c':
inode->i_mode &= ~S_IFBLK;
inode->i_mode |= S_IFCHR;
break;
case 'b':
break;
default:
dprintk(DEBUG_ERROR, "Unknown special type %c (%.*s)\n",
type, stat->extension.len, stat->extension.str);
};
inode->i_rdev = MKDEV(major, minor);
} else
inode->i_rdev = 0;
inode->i_size = stat->length;
inode->i_blksize = sb->s_blocksize;
inode->i_blocks =
(inode->i_size + inode->i_blksize - 1) >> sb->s_blocksize_bits;
}
/**
* v9fs_qid2ino - convert qid into inode number
* @qid: qid to hash
*
* BUG: potential for inode number collisions?
*/
ino_t v9fs_qid2ino(struct v9fs_qid *qid)
{
u64 path = qid->path + 2;
ino_t i = 0;
if (sizeof(ino_t) == sizeof(path))
memcpy(&i, &path, sizeof(ino_t));
else
i = (ino_t) (path ^ (path >> 32));
return i;
}
/**
* v9fs_readlink - read a symlink's location (internal version)
* @dentry: dentry for symlink
* @buffer: buffer to load symlink location into
* @buflen: length of buffer
*
*/
static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
{
int retval = -EPERM;
struct v9fs_fcall *fcall = NULL;
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
struct v9fs_fid *fid = v9fs_fid_lookup(dentry);
if (!fid) {
dprintk(DEBUG_ERROR, "could not resolve fid from dentry\n");
retval = -EBADF;
goto FreeFcall;
}
if (!v9ses->extended) {
retval = -EBADF;
dprintk(DEBUG_ERROR, "not extended\n");
goto FreeFcall;
}
dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name);
retval = v9fs_t_stat(v9ses, fid->fid, &fcall);
if (retval < 0) {
dprintk(DEBUG_ERROR, "stat error\n");
goto FreeFcall;
}
if (!fcall)
return -EIO;
if (!(fcall->params.rstat.stat.mode & V9FS_DMSYMLINK)) {
retval = -EINVAL;
goto FreeFcall;
}
/* copy extension buffer into buffer */
if (fcall->params.rstat.stat.extension.len < buflen)
buflen = fcall->params.rstat.stat.extension.len;
memcpy(buffer, fcall->params.rstat.stat.extension.str, buflen - 1);
buffer[buflen-1] = 0;
retval = buflen;
FreeFcall:
kfree(fcall);
return retval;
}
/**
* v9fs_vfs_readlink - read a symlink's location
* @dentry: dentry for symlink
* @buf: buffer to load symlink location into
* @buflen: length of buffer
*
*/
static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer,
int buflen)
{
int retval;
int ret;
char *link = __getname();
if (buflen > PATH_MAX)
buflen = PATH_MAX;
dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
retval = v9fs_readlink(dentry, link, buflen);
if (retval > 0) {
if ((ret = copy_to_user(buffer, link, retval)) != 0) {
dprintk(DEBUG_ERROR, "problem copying to user: %d\n",
ret);
retval = ret;
}
}
__putname(link);
return retval;
}
/**
* v9fs_vfs_follow_link - follow a symlink path
* @dentry: dentry for symlink
* @nd: nameidata
*
*/
static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
{
int len = 0;
char *link = __getname();
dprintk(DEBUG_VFS, "%s n", dentry->d_name.name);
if (!link)
link = ERR_PTR(-ENOMEM);
else {
len = v9fs_readlink(dentry, link, strlen(link));
if (len < 0) {
__putname(link);
link = ERR_PTR(len);
} else
link[len] = 0;
}
nd_set_link(nd, link);
return NULL;
}
/**
* v9fs_vfs_put_link - release a symlink path
* @dentry: dentry for symlink
* @nd: nameidata
*
*/
static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
{
char *s = nd_get_link(nd);
dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s);
if (!IS_ERR(s))
__putname(s);
}
static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
int mode, const char *extension)
{
int err, retval;
struct v9fs_session_info *v9ses;
struct v9fs_fcall *fcall;
struct v9fs_fid *fid;
struct v9fs_wstat wstat;
v9ses = v9fs_inode2v9ses(dir);
retval = -EPERM;
fcall = NULL;
if (!v9ses->extended) {
dprintk(DEBUG_ERROR, "not extended\n");
goto free_mem;
}