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/*
* inode.c
*
* Copyright (C) 1995, 1996 by Paal-Kr. Engstad and Volker Lendecke
* Copyright (C) 1997 by Volker Lendecke
*
* Please add a note about your changes to smbfs in the ChangeLog file.
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/locks.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/file.h>
#include <linux/dcache.h>
#include <linux/smp_lock.h>
#include <linux/nls.h>
#include <linux/seq_file.h>
#include <linux/smb_fs.h>
#include <linux/smbno.h>
#include <linux/smb_mount.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include "smb_debug.h"
#include "getopt.h"
#include "proto.h"
/* Always pick a default string */
#ifdef CONFIG_SMB_NLS_REMOTE
#define SMB_NLS_REMOTE CONFIG_SMB_NLS_REMOTE
#else
#define SMB_NLS_REMOTE ""
#endif
#define SMB_TTL_DEFAULT 1000
static void smb_delete_inode(struct inode *);
static void smb_put_super(struct super_block *);
static int smb_statfs(struct super_block *, struct statfs *);
static int smb_show_options(struct seq_file *, struct vfsmount *);
static struct super_operations smb_sops =
{
put_inode: force_delete,
delete_inode: smb_delete_inode,
put_super: smb_put_super,
statfs: smb_statfs,
show_options: smb_show_options,
};
/* We are always generating a new inode here */
struct inode *
smb_iget(struct super_block *sb, struct smb_fattr *fattr)
{
struct inode *result;
DEBUG1("smb_iget: %p\n", fattr);
result = new_inode(sb);
if (!result)
return result;
result->i_ino = fattr->f_ino;
memset(&(result->u.smbfs_i), 0, sizeof(result->u.smbfs_i));
smb_set_inode_attr(result, fattr);
if (S_ISREG(result->i_mode)) {
result->i_op = &smb_file_inode_operations;
result->i_fop = &smb_file_operations;
result->i_data.a_ops = &smb_file_aops;
} else if (S_ISDIR(result->i_mode)) {
result->i_op = &smb_dir_inode_operations;
result->i_fop = &smb_dir_operations;
}
insert_inode_hash(result);
return result;
}
/*
* Copy the inode data to a smb_fattr structure.
*/
void
smb_get_inode_attr(struct inode *inode, struct smb_fattr *fattr)
{
memset(fattr, 0, sizeof(struct smb_fattr));
fattr->f_mode = inode->i_mode;
fattr->f_nlink = inode->i_nlink;
fattr->f_ino = inode->i_ino;
fattr->f_uid = inode->i_uid;
fattr->f_gid = inode->i_gid;
fattr->f_rdev = inode->i_rdev;
fattr->f_size = inode->i_size;
fattr->f_mtime = inode->i_mtime;
fattr->f_ctime = inode->i_ctime;
fattr->f_atime = inode->i_atime;
fattr->f_blksize= inode->i_blksize;
fattr->f_blocks = inode->i_blocks;
fattr->attr = inode->u.smbfs_i.attr;
/*
* Keep the attributes in sync with the inode permissions.
*/
if (fattr->f_mode & S_IWUSR)
fattr->attr &= ~aRONLY;
else
fattr->attr |= aRONLY;
}
/*
* Update the inode, possibly causing it to invalidate its pages if mtime/size
* is different from last time.
*/
void
smb_set_inode_attr(struct inode *inode, struct smb_fattr *fattr)
{
/*
* A size change should have a different mtime, or same mtime
* but different size.
*/
time_t last_time = inode->i_mtime;
loff_t last_sz = inode->i_size;
inode->i_mode = fattr->f_mode;
inode->i_nlink = fattr->f_nlink;
inode->i_uid = fattr->f_uid;
inode->i_gid = fattr->f_gid;
inode->i_rdev = fattr->f_rdev;
inode->i_ctime = fattr->f_ctime;
inode->i_blksize= fattr->f_blksize;
inode->i_blocks = fattr->f_blocks;
inode->i_size = fattr->f_size;
inode->i_mtime = fattr->f_mtime;
inode->i_atime = fattr->f_atime;
inode->u.smbfs_i.attr = fattr->attr;
/*
* Update the "last time refreshed" field for revalidation.
*/
inode->u.smbfs_i.oldmtime = jiffies;
if (inode->i_mtime != last_time || inode->i_size != last_sz) {
VERBOSE("%ld changed, old=%ld, new=%ld, oz=%ld, nz=%ld\n",
inode->i_ino,
(long) last_time, (long) inode->i_mtime,
(long) last_sz, (long) inode->i_size);
if (!S_ISDIR(inode->i_mode))
invalidate_inode_pages(inode);
}
}
/*
* This is called if the connection has gone bad ...
* try to kill off all the current inodes.
*/
void
smb_invalidate_inodes(struct smb_sb_info *server)
{
VERBOSE("\n");
shrink_dcache_sb(SB_of(server));
invalidate_inodes(SB_of(server));
}
/*
* This is called to update the inode attributes after
* we've made changes to a file or directory.
*/
static int
smb_refresh_inode(struct dentry *dentry)
{
struct inode *inode = dentry->d_inode;
int error;
struct smb_fattr fattr;
error = smb_proc_getattr(dentry, &fattr);
if (!error) {
smb_renew_times(dentry);
/*
* Check whether the type part of the mode changed,
* and don't update the attributes if it did.
*/
if ((inode->i_mode & S_IFMT) == (fattr.f_mode & S_IFMT)) {
smb_set_inode_attr(inode, &fattr);
} else {
/*
* Big trouble! The inode has become a new object,
* so any operations attempted on it are invalid.
*
* To limit damage, mark the inode as bad so that
* subsequent lookup validations will fail.
*/
PARANOIA("%s/%s changed mode, %07o to %07o\n",
DENTRY_PATH(dentry),
inode->i_mode, fattr.f_mode);
fattr.f_mode = inode->i_mode; /* save mode */
make_bad_inode(inode);
inode->i_mode = fattr.f_mode; /* restore mode */
/*
* No need to worry about unhashing the dentry: the
* lookup validation will see that the inode is bad.
* But we do want to invalidate the caches ...
*/
if (!S_ISDIR(inode->i_mode))
invalidate_inode_pages(inode);
else
smb_invalid_dir_cache(inode);
error = -EIO;
}
}
return error;
}
/*
* This is called when we want to check whether the inode
* has changed on the server. If it has changed, we must
* invalidate our local caches.
*/
int
smb_revalidate_inode(struct dentry *dentry)
{
struct smb_sb_info *s = server_from_dentry(dentry);
struct inode *inode = dentry->d_inode;
int error = 0;
DEBUG1("smb_revalidate_inode\n");
lock_kernel();
/*
* Check whether we've recently refreshed the inode.
*/
if (time_before(jiffies, inode->u.smbfs_i.oldmtime + SMB_MAX_AGE(s))) {
VERBOSE("up-to-date, ino=%ld, jiffies=%lu, oldtime=%lu\n",
inode->i_ino, jiffies, inode->u.smbfs_i.oldmtime);
goto out;
}
error = smb_refresh_inode(dentry);
out:
unlock_kernel();
return error;
}
/*
* This routine is called when i_nlink == 0 and i_count goes to 0.
* All blocking cleanup operations need to go here to avoid races.
*/
static void
smb_delete_inode(struct inode *ino)
{
DEBUG1("ino=%ld\n", ino->i_ino);
lock_kernel();
if (smb_close(ino))
PARANOIA("could not close inode %ld\n", ino->i_ino);
unlock_kernel();
clear_inode(ino);
}
static struct option opts[] = {
{ "version", 0, 'v' },
{ "win95", SMB_MOUNT_WIN95, 1 },
{ "oldattr", SMB_MOUNT_OLDATTR, 1 },
{ "dirattr", SMB_MOUNT_DIRATTR, 1 },
{ "case", SMB_MOUNT_CASE, 1 },
{ "uid", 0, 'u' },
{ "gid", 0, 'g' },
{ "file_mode", 0, 'f' },
{ "dir_mode", 0, 'd' },
{ "iocharset", 0, 'i' },
{ "codepage", 0, 'c' },
{ "ttl", 0, 't' },
{ NULL, 0, 0}
};
static int
parse_options(struct smb_mount_data_kernel *mnt, char *options)
{
int c;
unsigned long flags;
unsigned long value;
char *optarg;
char *optopt;
flags = 0;
while ( (c = smb_getopt("smbfs", &options, opts,
&optopt, &optarg, &flags, &value)) > 0) {
VERBOSE("'%s' -> '%s'\n", optopt, optarg ? optarg : "<none>");
switch (c) {
case 1:
/* got a "flag" option */
break;
case 'v':
if (value != SMB_MOUNT_VERSION) {
printk ("smbfs: Bad mount version %ld, expected %d\n",
value, SMB_MOUNT_VERSION);
return 0;
}
mnt->version = value;
break;
case 'u':
mnt->uid = value;
break;
case 'g':
mnt->gid = value;
break;
case 'f':
mnt->file_mode = (value & S_IRWXUGO) | S_IFREG;
break;
case 'd':
mnt->dir_mode = (value & S_IRWXUGO) | S_IFDIR;
break;
case 'i':
strncpy(mnt->codepage.local_name, optarg,
SMB_NLS_MAXNAMELEN);
break;
case 'c':
strncpy(mnt->codepage.remote_name, optarg,
SMB_NLS_MAXNAMELEN);
break;
case 't':
mnt->ttl = value;
break;
default:
printk ("smbfs: Unrecognized mount option %s\n",
optopt);
return -1;
}
}
mnt->flags = flags;
return c;
}
/*
* smb_show_options() is for displaying mount options in /proc/mounts.
* It tries to avoid showing settings that were not changed from their
* defaults.
*/
static int
smb_show_options(struct seq_file *s, struct vfsmount *m)
{
struct smb_mount_data_kernel *mnt = m->mnt_sb->u.smbfs_sb.mnt;
int i;
for (i = 0; opts[i].name != NULL; i++)
if (mnt->flags & opts[i].flag)
seq_printf(s, ",%s", opts[i].name);
if (mnt->uid != 0)
seq_printf(s, ",uid=%d", mnt->uid);
if (mnt->gid != 0)
seq_printf(s, ",gid=%d", mnt->gid);
if (mnt->mounted_uid != 0)
seq_printf(s, ",mounted_uid=%d", mnt->mounted_uid);
/*
* Defaults for file_mode and dir_mode are unknown to us; they
* depend on the current umask of the user doing the mount.
*/
seq_printf(s, ",file_mode=%04o", mnt->file_mode & S_IRWXUGO);
seq_printf(s, ",dir_mode=%04o", mnt->dir_mode & S_IRWXUGO);
if (strcmp(mnt->codepage.local_name, CONFIG_NLS_DEFAULT))
seq_printf(s, ",iocharset=%s", mnt->codepage.local_name);
if (strcmp(mnt->codepage.remote_name, SMB_NLS_REMOTE))
seq_printf(s, ",codepage=%s", mnt->codepage.remote_name);
if (mnt->ttl != SMB_TTL_DEFAULT)
seq_printf(s, ",ttl=%d", mnt->ttl);
return 0;
}
static void
smb_put_super(struct super_block *sb)
{
struct smb_sb_info *server = &(sb->u.smbfs_sb);
if (server->sock_file) {
smb_dont_catch_keepalive(server);
fput(server->sock_file);
}
if (server->conn_pid)
kill_proc(server->conn_pid, SIGTERM, 1);
smb_kfree(server->mnt);
smb_kfree(server->temp_buf);
if (server->packet)
smb_vfree(server->packet);
if (server->remote_nls) {
unload_nls(server->remote_nls);
server->remote_nls = NULL;
}
if (server->local_nls) {
unload_nls(server->local_nls);
server->local_nls = NULL;
}
}
struct super_block *
smb_read_super(struct super_block *sb, void *raw_data, int silent)
{
struct smb_sb_info *server = &sb->u.smbfs_sb;
struct smb_mount_data_kernel *mnt;
struct smb_mount_data *oldmnt;
struct inode *root_inode;
struct smb_fattr root;
int ver;
if (!raw_data)
goto out_no_data;
oldmnt = (struct smb_mount_data *) raw_data;
ver = oldmnt->version;
if (ver != SMB_MOUNT_OLDVERSION && cpu_to_be32(ver) != SMB_MOUNT_ASCII)
goto out_wrong_data;
sb->s_blocksize = 1024; /* Eh... Is this correct? */
sb->s_blocksize_bits = 10;
sb->s_magic = SMB_SUPER_MAGIC;
sb->s_op = &smb_sops;
server->mnt = NULL;
server->sock_file = NULL;
init_MUTEX(&server->sem);
init_waitqueue_head(&server->wait);
server->conn_pid = 0;
server->state = CONN_INVALID; /* no connection yet */
server->generation = 0;
server->packet_size = smb_round_length(SMB_INITIAL_PACKET_SIZE);
server->packet = smb_vmalloc(server->packet_size);
if (!server->packet)
goto out_no_mem;
/* Allocate the global temp buffer */
server->temp_buf = smb_kmalloc(2*SMB_MAXPATHLEN+20, GFP_KERNEL);
if (!server->temp_buf)
goto out_no_temp;
/* Setup NLS stuff */
server->remote_nls = NULL;
server->local_nls = NULL;
server->name_buf = server->temp_buf + SMB_MAXPATHLEN + 20;
/* Allocate the mount data structure */
/* FIXME: merge this with the other malloc and get a whole page? */
mnt = smb_kmalloc(sizeof(struct smb_mount_data_kernel), GFP_KERNEL);
if (!mnt)
goto out_no_mount;
server->mnt = mnt;
memset(mnt, 0, sizeof(struct smb_mount_data_kernel));
strncpy(mnt->codepage.local_name, CONFIG_NLS_DEFAULT,
SMB_NLS_MAXNAMELEN);
strncpy(mnt->codepage.remote_name, SMB_NLS_REMOTE,
SMB_NLS_MAXNAMELEN);
mnt->ttl = SMB_TTL_DEFAULT;
if (ver == SMB_MOUNT_OLDVERSION) {
mnt->version = oldmnt->version;
/* FIXME: is this enough to convert uid/gid's ? */
mnt->mounted_uid = oldmnt->mounted_uid;
mnt->uid = oldmnt->uid;
mnt->gid = oldmnt->gid;
mnt->file_mode = (oldmnt->file_mode & S_IRWXUGO) | S_IFREG;
mnt->dir_mode = (oldmnt->dir_mode & S_IRWXUGO) | S_IFDIR;
mnt->flags = (oldmnt->file_mode >> 9);
} else {
if (parse_options(mnt, raw_data))
goto out_bad_option;
mnt->mounted_uid = current->uid;
}
smb_setcodepage(server, &mnt->codepage);
/*
* Display the enabled options
* Note: smb_proc_getattr uses these in 2.4 (but was changed in 2.2)
*/
if (mnt->flags & SMB_MOUNT_OLDATTR)
printk("SMBFS: Using core getattr (Win 95 speedup)\n");
else if (mnt->flags & SMB_MOUNT_DIRATTR)
printk("SMBFS: Using dir ff getattr\n");
/*
* Keep the super block locked while we get the root inode.
*/
smb_init_root_dirent(server, &root);
root_inode = smb_iget(sb, &root);
if (!root_inode)
goto out_no_root;
sb->s_root = d_alloc_root(root_inode);
if (!sb->s_root)
goto out_no_root;
smb_new_dentry(sb->s_root);
return sb;
out_no_root:
iput(root_inode);
out_bad_option:
smb_kfree(server->mnt);
out_no_mount:
smb_kfree(server->temp_buf);
out_no_temp:
smb_vfree(server->packet);
out_no_mem:
if (!server->mnt)
printk(KERN_ERR "smb_read_super: allocation failure\n");
goto out_fail;
out_wrong_data:
printk(KERN_ERR "smbfs: mount_data version %d is not supported\n", ver);
goto out_fail;
out_no_data:
printk(KERN_ERR "smb_read_super: missing data argument\n");
out_fail:
return NULL;
}
static int
smb_statfs(struct super_block *sb, struct statfs *buf)
{
int result = smb_proc_dskattr(sb, buf);
buf->f_type = SMB_SUPER_MAGIC;
buf->f_namelen = SMB_MAXPATHLEN;
return result;
}
int
smb_notify_change(struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = dentry->d_inode;
struct smb_sb_info *server = server_from_dentry(dentry);
unsigned int mask = (S_IFREG | S_IFDIR | S_IRWXUGO);
int error, changed, refresh = 0;
struct smb_fattr fattr;
error = smb_revalidate_inode(dentry);
if (error)
goto out;
if ((error = inode_change_ok(inode, attr)) < 0)
goto out;
error = -EPERM;
if ((attr->ia_valid & ATTR_UID) && (attr->ia_uid != server->mnt->uid))
goto out;
if ((attr->ia_valid & ATTR_GID) && (attr->ia_uid != server->mnt->gid))
goto out;
if ((attr->ia_valid & ATTR_MODE) && (attr->ia_mode & ~mask))
goto out;
if ((attr->ia_valid & ATTR_SIZE) != 0) {
VERBOSE("changing %s/%s, old size=%ld, new size=%ld\n",
DENTRY_PATH(dentry),
(long) inode->i_size, (long) attr->ia_size);
filemap_fdatasync(inode->i_mapping);
filemap_fdatawait(inode->i_mapping);
error = smb_open(dentry, O_WRONLY);
if (error)
goto out;
error = smb_proc_trunc(server, inode->u.smbfs_i.fileid,
attr->ia_size);
if (error)
goto out;
error = vmtruncate(inode, attr->ia_size);
if (error)
goto out;
refresh = 1;
}
/*
* Initialize the fattr and check for changed fields.
* Note: CTIME under SMB is creation time rather than
* change time, so we don't attempt to change it.
*/
smb_get_inode_attr(inode, &fattr);
changed = 0;
if ((attr->ia_valid & ATTR_MTIME) != 0) {
fattr.f_mtime = attr->ia_mtime;
changed = 1;
}
if ((attr->ia_valid & ATTR_ATIME) != 0) {
fattr.f_atime = attr->ia_atime;
/* Earlier protocols don't have an access time */
if (server->opt.protocol >= SMB_PROTOCOL_LANMAN2)
changed = 1;
}
if (changed) {
error = smb_proc_settime(dentry, &fattr);
if (error)
goto out;
refresh = 1;
}
/*
* Check for mode changes ... we're extremely limited in
* what can be set for SMB servers: just the read-only bit.
*/
if ((attr->ia_valid & ATTR_MODE) != 0) {
VERBOSE("%s/%s mode change, old=%x, new=%x\n",
DENTRY_PATH(dentry), fattr.f_mode, attr->ia_mode);
changed = 0;
if (attr->ia_mode & S_IWUSR) {
if (fattr.attr & aRONLY) {
fattr.attr &= ~aRONLY;
changed = 1;
}
} else {
if (!(fattr.attr & aRONLY)) {
fattr.attr |= aRONLY;
changed = 1;
}
}
if (changed) {
error = smb_proc_setattr(dentry, &fattr);
if (error)
goto out;
refresh = 1;
}
}
error = 0;
out:
if (refresh)
smb_refresh_inode(dentry);
return error;
}
#ifdef DEBUG_SMB_MALLOC
int smb_malloced;
int smb_current_kmalloced;
int smb_current_vmalloced;
#endif
static DECLARE_FSTYPE( smb_fs_type, "smbfs", smb_read_super, 0);
static int __init init_smb_fs(void)
{
DEBUG1("registering ...\n");
#ifdef DEBUG_SMB_MALLOC
smb_malloced = 0;
smb_current_kmalloced = 0;
smb_current_vmalloced = 0;
#endif
return register_filesystem(&smb_fs_type);
}
static void __exit exit_smb_fs(void)
{
DEBUG1("unregistering ...\n");
unregister_filesystem(&smb_fs_type);
#ifdef DEBUG_SMB_MALLOC
printk(KERN_DEBUG "smb_malloced: %d\n", smb_malloced);
printk(KERN_DEBUG "smb_current_kmalloced: %d\n",smb_current_kmalloced);
printk(KERN_DEBUG "smb_current_vmalloced: %d\n",smb_current_vmalloced);
#endif
}
EXPORT_NO_SYMBOLS;
module_init(init_smb_fs)
module_exit(exit_smb_fs)
MODULE_LICENSE("GPL");
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