cifsfs.c

Linux Kernel 2.6.9 for OMAP1710

/*
 *   fs/cifs/cifsfs.c
 *
 *   Copyright (C) International Business Machines  Corp., 2002,2004
 *   Author(s): Steve French ([e-mail])
 *
 *   Common Internet FileSystem (CIFS) client
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library 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 Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

/* Note that BB means BUGBUG (ie something to fix eventually) */

#include <linux/module.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/seq_file.h>
#include <linux/vfs.h>
#include <linux/mempool.h>
#include "cifsfs.h"
#include "cifspdu.h"
#define DECLARE_GLOBALS_HERE
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
#include <linux/mm.h>
#define CIFS_MAGIC_NUMBER 0xFF534D42	/* the first four bytes of SMB PDUs */

#ifdef CONFIG_CIFS_QUOTA
static struct quotactl_ops cifs_quotactl_ops;
#endif

int cifsFYI = 0;
int cifsERROR = 1;
int traceSMB = 0;
unsigned int oplockEnabled = 1;
unsigned int quotaEnabled = 0;
unsigned int linuxExtEnabled = 1;
unsigned int lookupCacheEnabled = 1;
unsigned int multiuser_mount = 0;
unsigned int extended_security = 0;
unsigned int ntlmv2_support = 0;
unsigned int sign_CIFS_PDUs = 1;
unsigned int CIFSMaximumBufferSize = CIFS_MAX_MSGSIZE;
struct task_struct * oplockThread = NULL;

extern int cifs_mount(struct super_block *, struct cifs_sb_info *, char *,
			const char *);
extern int cifs_umount(struct super_block *, struct cifs_sb_info *);
void cifs_proc_init(void);
void cifs_proc_clean(void);

static DECLARE_COMPLETION(cifs_oplock_exited);


static int
cifs_read_super(struct super_block *sb, void *data,
		const char *devname, int silent)
{
	struct inode *inode;
	struct cifs_sb_info *cifs_sb;
	int rc = 0;

	sb->s_flags |= MS_NODIRATIME; /* and probably even noatime */
	sb->s_fs_info = kmalloc(sizeof(struct cifs_sb_info),GFP_KERNEL);
	cifs_sb = CIFS_SB(sb);
	if(cifs_sb == NULL)
		return -ENOMEM;
	else
		memset(cifs_sb,0,sizeof(struct cifs_sb_info));
	

	rc = cifs_mount(sb, cifs_sb, data, devname);

	if (rc) {
		if (!silent)
			cERROR(1,
			       ("cifs_mount failed w/return code = %d", rc));
		goto out_mount_failed;
	}

	sb->s_magic = CIFS_MAGIC_NUMBER;
	sb->s_op = &cifs_super_ops;
/*	if(cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
	    sb->s_blocksize = cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
#ifdef CONFIG_CIFS_QUOTA
	sb->s_qcop = &cifs_quotactl_ops;
#endif
	sb->s_blocksize = CIFS_MAX_MSGSIZE;
	sb->s_blocksize_bits = 14;	/* default 2**14 = CIFS_MAX_MSGSIZE */
	inode = iget(sb, ROOT_I);

	if (!inode) {
		rc = -ENOMEM;
		goto out_no_root;
	}

	sb->s_root = d_alloc_root(inode);

	if (!sb->s_root) {
		rc = -ENOMEM;
		goto out_no_root;
	}

	return 0;

out_no_root:
	cERROR(1, ("cifs_read_super: get root inode failed"));
	if (inode)
		iput(inode);

out_mount_failed:
	if(cifs_sb) {
		if(cifs_sb->local_nls)
			unload_nls(cifs_sb->local_nls);	
		kfree(cifs_sb);
	}
	return rc;
}

static void
cifs_put_super(struct super_block *sb)
{
	int rc = 0;
	struct cifs_sb_info *cifs_sb;

	cFYI(1, ("In cifs_put_super"));
	cifs_sb = CIFS_SB(sb);
	if(cifs_sb == NULL) {
		cFYI(1,("Empty cifs superblock info passed to unmount"));
		return;
	}
	rc = cifs_umount(sb, cifs_sb); 
	if (rc) {
		cERROR(1, ("cifs_umount failed with return code %d", rc));
	}
	unload_nls(cifs_sb->local_nls);
	kfree(cifs_sb);
	return;
}

static int
cifs_statfs(struct super_block *sb, struct kstatfs *buf)
{
	int xid, rc;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;

	xid = GetXid();

	cifs_sb = CIFS_SB(sb);
	pTcon = cifs_sb->tcon;

	buf->f_type = CIFS_MAGIC_NUMBER;

	/* instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO */
	buf->f_namelen = PATH_MAX;	/* PATH_MAX may be too long - it would presumably
					   be length of total path, note that some servers may be 
					   able to support more than this, but best to be safe
					   since Win2k and others can not handle very long filenames */
	buf->f_files = 0;	/* undefined */
	buf->f_ffree = 0;	/* unlimited */

	rc = CIFSSMBQFSInfo(xid, pTcon, buf, cifs_sb->local_nls);

	/*     
	   int f_type;
	   __fsid_t f_fsid;
	   int f_namelen;  */
	/* BB get from info put in tcon struct at mount time with call to QFSAttrInfo */
	FreeXid(xid);
	return 0;		/* always return success? what if volume is no longer available? */
}

static int cifs_permission(struct inode * inode, int mask, struct nameidata *nd)
{
	struct cifs_sb_info *cifs_sb;

	cifs_sb = CIFS_SB(inode->i_sb);

	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
		return 0;
	} else /* file mode might have been restricted at mount time 
		on the client (above and beyond ACL on servers) for  
		servers which do not support setting and viewing mode bits,
		so allowing client to check permissions is useful */ 
		return vfs_permission(inode, mask);
}

static kmem_cache_t *cifs_inode_cachep;
static kmem_cache_t *cifs_req_cachep;
static kmem_cache_t *cifs_mid_cachep;
kmem_cache_t *cifs_oplock_cachep;
mempool_t *cifs_req_poolp;
mempool_t *cifs_mid_poolp;

static struct inode *
cifs_alloc_inode(struct super_block *sb)
{
	struct cifsInodeInfo *cifs_inode;
	cifs_inode =
	    (struct cifsInodeInfo *) kmem_cache_alloc(cifs_inode_cachep,
						      SLAB_KERNEL);
	if (!cifs_inode)
		return NULL;
	cifs_inode->cifsAttrs = 0x20;	/* default */
	atomic_set(&cifs_inode->inUse, 0);
	cifs_inode->time = 0;
	/* Until the file is open and we have gotten oplock
	info back from the server, can not assume caching of
	file data or metadata */
	cifs_inode->clientCanCacheRead = FALSE;
	cifs_inode->clientCanCacheAll = FALSE;
	cifs_inode->vfs_inode.i_blksize = CIFS_MAX_MSGSIZE;
	cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */

	INIT_LIST_HEAD(&cifs_inode->openFileList);
	return &cifs_inode->vfs_inode;
}

static void
cifs_destroy_inode(struct inode *inode)
{
	kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
}

/*
 * cifs_show_options() is for displaying mount options in /proc/mounts.
 * Not all settable options are displayed but most of the important
 * ones are.
 */
static int
cifs_show_options(struct seq_file *s, struct vfsmount *m)
{
	struct cifs_sb_info *cifs_sb;

	cifs_sb = CIFS_SB(m->mnt_sb);

	if (cifs_sb) {
		if (cifs_sb->tcon) {
			seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
			if (cifs_sb->tcon->ses) {
				if (cifs_sb->tcon->ses->userName)
					seq_printf(s, ",username=%s",
					   cifs_sb->tcon->ses->userName);
				if(cifs_sb->tcon->ses->domainName)
					seq_printf(s, ",domain=%s",
					   cifs_sb->tcon->ses->domainName);
			}
		}
		seq_printf(s, ",rsize=%d",cifs_sb->rsize);
		seq_printf(s, ",wsize=%d",cifs_sb->wsize);
	}
	return 0;
}

#ifdef CONFIG_CIFS_QUOTA
int cifs_xquota_set(struct super_block * sb, int quota_type, qid_t qid,
		struct fs_disk_quota * pdquota)
{
	int xid;
	int rc = 0;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	struct cifsTconInfo *pTcon;
	
	if(cifs_sb)
		pTcon = cifs_sb->tcon;
	else
		return -EIO;


	xid = GetXid();
	if(pTcon) {
		cFYI(1,("set type: 0x%x id: %d",quota_type,qid));		
	} else {
		return -EIO;
	}

	FreeXid(xid);
	return rc;
}

int cifs_xquota_get(struct super_block * sb, int quota_type, qid_t qid,
                struct fs_disk_quota * pdquota)
{
	int xid;
	int rc = 0;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	struct cifsTconInfo *pTcon;

	if(cifs_sb)
		pTcon = cifs_sb->tcon;
	else
		return -EIO;

	xid = GetXid();
	if(pTcon) {
                cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
	} else {
		rc = -EIO;
	}

	FreeXid(xid);
	return rc;
}

int cifs_xstate_set(struct super_block * sb, unsigned int flags, int operation)
{
	int xid; 
	int rc = 0;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	struct cifsTconInfo *pTcon;

	if(cifs_sb)
		pTcon = cifs_sb->tcon;
	else
		return -EIO;

	xid = GetXid();
	if(pTcon) {
                cFYI(1,("flags: 0x%x operation: 0x%x",flags,operation));
	} else {
		rc = -EIO;
	}

	FreeXid(xid);
	return rc;
}

int cifs_xstate_get(struct super_block * sb, struct fs_quota_stat *qstats)
{
	int xid;
	int rc = 0;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	struct cifsTconInfo *pTcon;

	if(cifs_sb) {
		pTcon = cifs_sb->tcon;
	} else {
		return -EIO;
	}
	xid = GetXid();
	if(pTcon) {
		cFYI(1,("pqstats %p",qstats));		
	} else {
		rc = -EIO;
	}

	FreeXid(xid);
	return rc;
}

static struct quotactl_ops cifs_quotactl_ops = {
	.set_xquota	= cifs_xquota_set,
	.get_xquota	= cifs_xquota_set,
	.set_xstate	= cifs_xstate_set,
	.get_xstate	= cifs_xstate_get,
};
#endif

static int cifs_remount(struct super_block *sb, int *flags, char *data)
{
	*flags |= MS_NODIRATIME;
	return 0;
}

struct super_operations cifs_super_ops = {
	.read_inode = cifs_read_inode,
	.put_super = cifs_put_super,
	.statfs = cifs_statfs,
	.alloc_inode = cifs_alloc_inode,
	.destroy_inode = cifs_destroy_inode,
/*	.drop_inode	    = generic_delete_inode, 
	.delete_inode	= cifs_delete_inode,  *//* Do not need the above two functions     
   unless later we add lazy close of inodes or unless the kernel forgets to call
   us with the same number of releases (closes) as opens */
	.show_options = cifs_show_options,
/*    .umount_begin   = cifs_umount_begin, *//* consider adding in the future */
	.remount_fs = cifs_remount,
};

static struct super_block *
cifs_get_sb(struct file_system_type *fs_type,
	    int flags, const char *dev_name, void *data)
{
	int rc;
	struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);