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/*

 *   fs/cifs/cifsfs.c

 *

 *   Copyright (C) International Business Machines  Corp., 2002,2007

 *   Author(s): Steve French (sfrench@us.ibm.com)

 *

 *   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 <linux/delay.h>

#include <linux/kthread.h>

#include <linux/freezer.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>

#include <linux/key-type.h>

#include "cifs_spnego.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 /* QUOTA */

int cifsFYI = 0;

int cifsERROR = 1;

int traceSMB = 0;

unsigned int oplockEnabled = 1;

unsigned int experimEnabled = 0;

unsigned int linuxExtEnabled = 1;

unsigned int lookupCacheEnabled = 1;

unsigned int multiuser_mount = 0;

unsigned int extended_security = CIFSSEC_DEF;

/* unsigned int ntlmv2_support = 0; */

unsigned int sign_CIFS_PDUs = 1;

extern struct task_struct *oplockThread; /* remove sparse warning */

struct task_struct *oplockThread = NULL;

/* extern struct task_struct * dnotifyThread; remove sparse warning */

static struct task_struct *dnotifyThread = NULL;

static const struct super_operations cifs_super_ops;

unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;

module_param(CIFSMaxBufSize, int, 0);

MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "

                                 "Default: 16384 Range: 8192 to 130048");

unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;

module_param(cifs_min_rcv, int, 0);

MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "

                                "1 to 64");

unsigned int cifs_min_small = 30;

module_param(cifs_min_small, int, 0);

MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "

                                 "Range: 2 to 256");

unsigned int cifs_max_pending = CIFS_MAX_REQ;

module_param(cifs_max_pending, int, 0);

MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "

                                   "Default: 50 Range: 2 to 256");

extern mempool_t *cifs_sm_req_poolp;

extern mempool_t *cifs_req_poolp;

extern mempool_t *cifs_mid_poolp;

extern struct kmem_cache *cifs_oplock_cachep;

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;

        /* BB should we make this contingent on mount parm? */

        sb->s_flags |= MS_NODIRATIME | MS_NOATIME;

        sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);

        cifs_sb = CIFS_SB(sb);

        if (cifs_sb == NULL)

                return -ENOMEM;

        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;

        }

#ifdef CONFIG_CIFS_EXPERIMENTAL

        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {

                cFYI(1, ("export ops supported"));

                sb->s_export_op = &cifs_export_ops;

        }

#endif /* EXPERIMENTAL */

        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 dentry *dentry, struct kstatfs *buf)

{

        struct super_block *sb = dentry->d_sb;

        int xid;

        int rc = -EOPNOTSUPP;

        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 total path, but note

                                      that some servers (includinng Samba 3)

                                      have a shorter maximum path */

        buf->f_files = 0;        /* undefined */

        buf->f_ffree = 0;        /* unlimited */

/* BB we could add a second check for a QFS Unix capability bit */

/* BB FIXME check CIFS_POSIX_EXTENSIONS Unix cap first FIXME BB */

    if ((pTcon->ses->capabilities & CAP_UNIX) && (CIFS_POSIX_EXTENSIONS &

                        le64_to_cpu(pTcon->fsUnixInfo.Capability)))

            rc = CIFSSMBQFSPosixInfo(xid, pTcon, buf);

    /* Only need to call the old QFSInfo if failed

    on newer one */

    if (rc)

        if (pTcon->ses->capabilities & CAP_NT_SMBS)

                rc = CIFSSMBQFSInfo(xid, pTcon, buf); /* not supported by OS2 */

        /* Some old Windows servers also do not support level 103, retry with

           older level one if old server failed the previous call or we

           bypassed it because we detected that this was an older LANMAN sess */

        if (rc)

                rc = SMBOldQFSInfo(xid, pTcon, buf);

        /* int f_type;

           __fsid_t f_fsid;

           int f_namelen;  */

        /* BB get from info in tcon struct at mount time 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 generic_permission(inode, mask, NULL);

}

static struct kmem_cache *cifs_inode_cachep;

static struct kmem_cache *cifs_req_cachep;

static struct kmem_cache *cifs_mid_cachep;

struct kmem_cache *cifs_oplock_cachep;

static struct kmem_cache *cifs_sm_req_cachep;

mempool_t *cifs_sm_req_poolp;

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 = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);

        if (!cifs_inode)

                return NULL;

        cifs_inode->cifsAttrs = 0x20;   /* default */

        atomic_set(&cifs_inode->inUse, 0);

        cifs_inode->time = 0;

        cifs_inode->write_behind_rc = 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_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */

        /* Can not set i_flags here - they get immediately overwritten

           to zero by the VFS */

/*      cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/

        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) {

/* BB add prepath to mount options displayed */

                        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);

                        }

                        if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) ||

                           !(cifs_sb->tcon->unix_ext))

                                seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);

                        if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) ||

                           !(cifs_sb->tcon->unix_ext))

                                seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);

                }

                if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)

                        seq_printf(s, ",posixpaths");

                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 {

                rc = -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 void cifs_umount_begin(struct vfsmount *vfsmnt, int flags)

{

        struct cifs_sb_info *cifs_sb;

        struct cifsTconInfo *tcon;

        if (!(flags & MNT_FORCE))

                return;

        cifs_sb = CIFS_SB(vfsmnt->mnt_sb);

        if (cifs_sb == NULL)

                return;

        tcon = cifs_sb->tcon;

        if (tcon == NULL)

                return;

        down(&tcon->tconSem);

        if (atomic_read(&tcon->useCount) == 1)

                tcon->tidStatus = CifsExiting;

        up(&tcon->tconSem);

        /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */

        /* cancel_notify_requests(tcon); */

        if (tcon->ses && tcon->ses->server) {

                cFYI(1, ("wake up tasks now - umount begin not complete"));

                wake_up_all(&tcon->ses->server->request_q);

                wake_up_all(&tcon->ses->server->response_q);

                msleep(1); /* yield */

                /* we have to kick the requests once more */

                wake_up_all(&tcon->ses->server->response_q);

                msleep(1);

        }

/* BB FIXME - finish add checks for tidStatus BB */

        return;

}

#ifdef CONFIG_CIFS_STATS2

static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)

{

        /* BB FIXME */

        return 0;

}

#endif

static int cifs_remount(struct super_block *sb, int *flags, char *data)

{

        *flags |= MS_NODIRATIME;

        return 0;

}

static const 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 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,

        .remount_fs = cifs_remount,

#ifdef CONFIG_CIFS_STATS2

        .show_stats = cifs_show_stats,

#endif

};

static int

cifs_get_sb(struct file_system_type *fs_type,

            int flags, const char *dev_name, void *data, struct vfsmount *mnt)

{

        int rc;

        struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);

        cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));

        if (IS_ERR(sb))

                return PTR_ERR(sb);

        sb->s_flags = flags;

        rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);

        if (rc) {

                up_write(&sb->s_umount);

                deactivate_super(sb);

                return rc;

        }

        sb->s_flags |= MS_ACTIVE;

        return simple_set_mnt(mnt, sb);

}

static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,

                                   unsigned long nr_segs, loff_t pos)

{

        struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;

        ssize_t written;

        written = generic_file_aio_write(iocb, iov, nr_segs, pos);

        if (!CIFS_I(inode)->clientCanCacheAll)

                filemap_fdatawrite(inode->i_mapping);

        return written;

}

static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)

{

        /* origin == SEEK_END => we must revalidate the cached file length */

        if (origin == SEEK_END) {

                int retval;

                /* some applications poll for the file length in this strange

                   way so we must seek to end on non-oplocked files by

                   setting the revalidate time to zero */

                CIFS_I(file->f_path.dentry->d_inode)->time = 0;

                retval = cifs_revalidate(file->f_path.dentry);

                if (retval < 0)

                        return (loff_t)retval;

        }

        return remote_llseek(file, offset, origin);

}

static struct file_system_type cifs_fs_type = {

        .owner = THIS_MODULE,

        .name = "cifs",

        .get_sb = cifs_get_sb,

        .kill_sb = kill_anon_super,

        /*  .fs_flags */

};

const struct inode_operations cifs_dir_inode_ops = {

        .create = cifs_create,

        .lookup = cifs_lookup,

        .getattr = cifs_getattr,

        .unlink = cifs_unlink,

        .link = cifs_hardlink,

        .mkdir = cifs_mkdir,

        .rmdir = cifs_rmdir,

        .rename = cifs_rename,

        .permission = cifs_permission,

/*      revalidate:cifs_revalidate,   */

        .setattr = cifs_setattr,

        .symlink = cifs_symlink,

        .mknod   = cifs_mknod,

#ifdef CONFIG_CIFS_XATTR

        .setxattr = cifs_setxattr,

        .getxattr = cifs_getxattr,

        .listxattr = cifs_listxattr,

        .removexattr = cifs_removexattr,

#endif

};

const struct inode_operations cifs_file_inode_ops = {

/*      revalidate:cifs_revalidate, */

        .setattr = cifs_setattr,

        .getattr = cifs_getattr, /* do we need this anymore? */

        .rename = cifs_rename,

        .permission = cifs_permission,

#ifdef CONFIG_CIFS_XATTR

        .setxattr = cifs_setxattr,

        .getxattr = cifs_getxattr,

        .listxattr = cifs_listxattr,

        .removexattr = cifs_removexattr,

#endif

};

const struct inode_operations cifs_symlink_inode_ops = {

        .readlink = generic_readlink,

        .follow_link = cifs_follow_link,

        .put_link = cifs_put_link,

        .permission = cifs_permission,

        /* BB add the following two eventually */

        /* revalidate: cifs_revalidate,

           setattr:    cifs_notify_change, *//* BB do we need notify change */

#ifdef CONFIG_CIFS_XATTR

        .setxattr = cifs_setxattr,

        .getxattr = cifs_getxattr,

        .listxattr = cifs_listxattr,

        .removexattr = cifs_removexattr,

#endif

};

const struct file_operations cifs_file_ops = {

        .read = do_sync_read,

        .write = do_sync_write,

        .aio_read = generic_file_aio_read,

        .aio_write = cifs_file_aio_write,

        .open = cifs_open,

        .release = cifs_close,

        .lock = cifs_lock,

        .fsync = cifs_fsync,

        .flush = cifs_flush,

        .mmap  = cifs_file_mmap,

        .splice_read = generic_file_splice_read,

        .llseek = cifs_llseek,

#ifdef CONFIG_CIFS_POSIX

        .ioctl  = cifs_ioctl,

#endif /* CONFIG_CIFS_POSIX */

#ifdef CONFIG_CIFS_EXPERIMENTAL

        .dir_notify = cifs_dir_notify,

#endif /* CONFIG_CIFS_EXPERIMENTAL */

};

const struct file_operations cifs_file_direct_ops = {

        /* no mmap, no aio, no readv -

           BB reevaluate whether they can be done with directio, no cache */

        .read = cifs_user_read,

        .write = cifs_user_write,

        .open = cifs_open,

        .release = cifs_close,

        .lock = cifs_lock,

        .fsync = cifs_fsync,

        .flush = cifs_flush,

        .splice_read = generic_file_splice_read,

#ifdef CONFIG_CIFS_POSIX

        .ioctl  = cifs_ioctl,

#endif /* CONFIG_CIFS_POSIX */

        .llseek = cifs_llseek,

#ifdef CONFIG_CIFS_EXPERIMENTAL

        .dir_notify = cifs_dir_notify,

#endif /* CONFIG_CIFS_EXPERIMENTAL */

};

const struct file_operations cifs_file_nobrl_ops = {

        .read = do_sync_read,

        .write = do_sync_write,

        .aio_read = generic_file_aio_read,

        .aio_write = cifs_file_aio_write,

        .open = cifs_open,

        .release = cifs_close,

        .fsync = cifs_fsync,

        .flush = cifs_flush,

        .mmap  = cifs_file_mmap,

        .splice_read = generic_file_splice_read,

        .llseek = cifs_llseek,

#ifdef CONFIG_CIFS_POSIX

        .ioctl  = cifs_ioctl,

#endif /* CONFIG_CIFS_POSIX */

#ifdef CONFIG_CIFS_EXPERIMENTAL

        .dir_notify = cifs_dir_notify,

#endif /* CONFIG_CIFS_EXPERIMENTAL */

};

const struct file_operations cifs_file_direct_nobrl_ops = {

        /* no mmap, no aio, no readv -

           BB reevaluate whether they can be done with directio, no cache */