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root/fs/cifs/cifsfs.c

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DEFINITIONS

This source file includes following definitions.
  1. cifs_read_super
  2. cifs_put_super
  3. cifs_statfs
  4. cifs_permission
  5. cifs_alloc_inode
  6. cifs_destroy_inode
  7. cifs_show_options
  8. cifs_xquota_set
  9. cifs_xquota_get
  10. cifs_xstate_set
  11. cifs_xstate_get
  12. cifs_umount_begin
  13. cifs_show_stats
  14. cifs_remount
  15. cifs_get_sb
  16. cifs_file_aio_write
  17. cifs_llseek
  18. cifs_init_once
  19. cifs_init_inodecache
  20. cifs_destroy_inodecache
  21. cifs_init_request_bufs
  22. cifs_destroy_request_bufs
  23. cifs_init_mids
  24. cifs_destroy_mids
  25. cifs_oplock_thread
  26. cifs_dnotify_thread
  27. init_cifs
  28. exit_cifs

/*
 *   fs/cifs/cifsfs.c
 *
 *   Copyright (C) International Business Machines  Corp., 2002,2008
 *   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 "dns_resolve.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;

#ifdef CONFIG_CIFS_DFS_UPCALL
        /* copy mount params to sb for use in submounts */
        /* BB: should we move this after the mount so we
         * do not have to do the copy on failed mounts?
         * BB: May be it is better to do simple copy before
         * complex operation (mount), and in case of fail
         * just exit instead of doing mount and attempting
         * undo it if this copy fails?*/
        if (data) {
                int len = strlen(data);
                cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
                if (cifs_sb->mountdata == NULL) {
                        kfree(sb->s_fs_info);
                        sb->s_fs_info = NULL;
                        return -ENOMEM;
                }
                strncpy(cifs_sb->mountdata, data, len + 1);
                cifs_sb->mountdata[len] = '\0';
        }
#endif

        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 = cifs_iget(sb, ROOT_I);

        if (IS_ERR(inode)) {
                rc = PTR_ERR(inode);
                inode = NULL;
                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);

        cifs_umount(sb, cifs_sb);

out_mount_failed:
        if (cifs_sb) {
#ifdef CONFIG_CIFS_DFS_UPCALL
                if (cifs_sb->mountdata) {
                        kfree(cifs_sb->mountdata);
                        cifs_sb->mountdata = NULL;
                }
#endif
                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));
#ifdef CONFIG_CIFS_DFS_UPCALL
        if (cifs_sb->mountdata) {
                kfree(cifs_sb->mountdata);
                cifs_sb->mountdata = NULL;
        }
#endif

        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;
        struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
        struct cifsTconInfo *tcon = cifs_sb->tcon;
        int rc = -EOPNOTSUPP;
        int xid;

        xid = GetXid();

        buf->f_type = CIFS_MAGIC_NUMBER;

        /*
         * 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.
         *
         * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
         */
        buf->f_namelen = PATH_MAX;
        buf->f_files = 0;       /* undefined */
        buf->f_ffree = 0;       /* unlimited */

        /*
         * We could add a second check for a QFS Unix capability bit
         */
        if ((tcon->ses->capabilities & CAP_UNIX) &&
            (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
                rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);

        /*
         * Only need to call the old QFSInfo if failed on newer one,
         * e.g. by OS/2.
         **/
        if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
                rc = CIFSSMBQFSInfo(xid, tcon, buf);

        /*
         * 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, tcon, buf);

        FreeXid(xid);
        return 0;
}

static int cifs_permission(struct inode *inode, int mask)
{
        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->tcon->unix_ext) {
                                seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
                                           cifs_sb->mnt_file_mode,
                                           cifs_sb->mnt_dir_mode);
                        }
                        if (cifs_sb->tcon->seal)
                                seq_printf(s, ",seal");
                        if (cifs_sb->tcon->nocase)
                                seq_printf(s, ",nocase");
                        if (cifs_sb->tcon->retry)
                                seq_printf(s, ",hard");
                }
                if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
                        seq_printf(s, ",posixpaths");
                if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
                        seq_printf(s, ",setuids");
                if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
                        seq_printf(s, ",serverino");
                if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
                        seq_printf(s, ",directio");
                if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
                        seq_printf(s, ",nouser_xattr");
                if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
                        seq_printf(s, ",mapchars");
                if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
                        seq_printf(s, ",sfu");
                if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
                        seq_printf(s, ",nobrl");
                if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
                        seq_printf(s, ",cifsacl");
                if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
                        seq_printf(s, ",dynperm");
                if (m->mnt_sb->s_flags & MS_POSIXACL)
                        seq_printf(s, ",acl");

                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_get,
        .set_xstate     = cifs_xstate_set,
        .get_xstate     = cifs_xstate_get,
};
#endif

static void cifs_umount_begin(struct super_block *sb)
{
        struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
        struct cifsTconInfo *tcon;

        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 = {
        .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 generic_file_llseek_unlocked(file, offset, origin);
}

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
        .unlocked_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
        .unlocked_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
        .unlocked_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 */
        .read = cifs_user_read,
        .write = cifs_user_write,
        .open = cifs_open,
        .release = cifs_close,
        .fsync = cifs_fsync,
        .flush = cifs_flush,
        .splice_read = generic_file_splice_read,
#ifdef CONFIG_CIFS_POSIX
        .unlocked_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_dir_ops = {
        .readdir = cifs_readdir,
        .release = cifs_closedir,
        .read    = generic_read_dir,
#ifdef CONFIG_CIFS_EXPERIMENTAL
        .dir_notify = cifs_dir_notify,
#endif /* CONFIG_CIFS_EXPERIMENTAL */
        .unlocked_ioctl  = cifs_ioctl,
};

static void
cifs_init_once(void *inode)
{
        struct cifsInodeInfo *cifsi = inode;

        inode_init_once(&cifsi->vfs_inode);
        INIT_LIST_HEAD(&cifsi->lockList);
}

static int
cifs_init_inodecache(void)
{
        cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
                                              sizeof(struct cifsInodeInfo),
                                              0, (SLAB_RECLAIM_ACCOUNT|
                                                SLAB_MEM_SPREAD),
                                              cifs_init_once);
        if (cifs_inode_cachep == NULL)
                return -ENOMEM;

        return 0;
}

static void
cifs_destroy_inodecache(void)
{
        kmem_cache_destroy(cifs_inode_cachep);
}

static int
cifs_init_request_bufs(void)
{
        if (CIFSMaxBufSize < 8192) {
        /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
        Unicode path name has to fit in any SMB/CIFS path based frames */
                CIFSMaxBufSize = 8192;
        } else if (CIFSMaxBufSize > 1024*127) {
                CIFSMaxBufSize = 1024 * 127;
        } else {
                CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
        }
/*      cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
        cifs_req_cachep = kmem_cache_create("cifs_request",
                                            CIFSMaxBufSize +
                                            MAX_CIFS_HDR_SIZE, 0,
                                            SLAB_HWCACHE_ALIGN, NULL);
        if (cifs_req_cachep == NULL)
                return -ENOMEM;

        if (cifs_min_rcv < 1)
                cifs_min_rcv = 1;
        else if (cifs_min_rcv > 64) {
                cifs_min_rcv = 64;
                cERROR(1, ("cifs_min_rcv set to maximum (64)"));
        }

        cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
                                                  cifs_req_cachep);

        if (cifs_req_poolp == NULL) {
                kmem_cache_destroy(cifs_req_cachep);
                return -ENOMEM;
        }
        /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
        almost all handle based requests (but not write response, nor is it
        sufficient for path based requests).  A smaller size would have
        been more efficient (compacting multiple slab items on one 4k page)
        for the case in which debug was on, but this larger size allows
        more SMBs to use small buffer alloc and is still much more
        efficient to alloc 1 per page off the slab compared to 17K (5page)
        alloc of large cifs buffers even when page debugging is on */
        cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
                        MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
                        NULL);
        if (cifs_sm_req_cachep == NULL) {
                mempool_destroy(cifs_req_poolp);
                kmem_cache_destroy(cifs_req_cachep);
                return -ENOMEM;
        }

        if (cifs_min_small < 2)
                cifs_min_small = 2;
        else if (cifs_min_small > 256) {
                cifs_min_small = 256;
                cFYI(1, ("cifs_min_small set to maximum (256)"));
        }

        cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
                                                     cifs_sm_req_cachep);

        if (cifs_sm_req_poolp == NULL) {
                mempool_destroy(cifs_req_poolp);
                kmem_cache_destroy(cifs_req_cachep);
                kmem_cache_destroy(cifs_sm_req_cachep);
                return -ENOMEM;
        }

        return 0;
}

static void
cifs_destroy_request_bufs(void)
{
        mempool_destroy(cifs_req_poolp);
        kmem_cache_destroy(cifs_req_cachep);
        mempool_destroy(cifs_sm_req_poolp);
        kmem_cache_destroy(cifs_sm_req_cachep);
}

static int
cifs_init_mids(void)
{
        cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
                                            sizeof(struct mid_q_entry), 0,
                                            SLAB_HWCACHE_ALIGN, NULL);
        if (cifs_mid_cachep == NULL)
                return -ENOMEM;

        /* 3 is a reasonable minimum number of simultaneous operations */
        cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
        if (cifs_mid_poolp == NULL) {
                kmem_cache_destroy(cifs_mid_cachep);
                return -ENOMEM;
        }

        cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
                                        sizeof(struct oplock_q_entry), 0,
                                        SLAB_HWCACHE_ALIGN, NULL);
        if (cifs_oplock_cachep == NULL) {
                mempool_destroy(cifs_mid_poolp);
                kmem_cache_destroy(cifs_mid_cachep);
                return -ENOMEM;
        }

        return 0;
}

static void
cifs_destroy_mids(void)
{
        mempool_destroy(cifs_mid_poolp);
        kmem_cache_destroy(cifs_mid_cachep);
        kmem_cache_destroy(cifs_oplock_cachep);
}

static int cifs_oplock_thread(void *dummyarg)
{
        struct oplock_q_entry *oplock_item;
        struct cifsTconInfo *pTcon;
        struct inode *inode;
        __u16  netfid;
        int rc, waitrc = 0;

        set_freezable();
        do {
                if (try_to_freeze())
                        continue;

                spin_lock(&GlobalMid_Lock);
                if (list_empty(&GlobalOplock_Q)) {
                        spin_unlock(&GlobalMid_Lock);
                        set_current_state(TASK_INTERRUPTIBLE);
                        schedule_timeout(39*HZ);
                } else {
                        oplock_item = list_entry(GlobalOplock_Q.next,
                                                struct oplock_q_entry, qhead);
                        cFYI(1, ("found oplock item to write out"));
                        pTcon = oplock_item->tcon;
                        inode = oplock_item->pinode;
                        netfid = oplock_item->netfid;
                        spin_unlock(&GlobalMid_Lock);
                        DeleteOplockQEntry(oplock_item);
                        /* can not grab inode sem here since it would
                                deadlock when oplock received on delete
                                since vfs_unlink holds the i_mutex across
                                the call */
                        /* mutex_lock(&inode->i_mutex);*/
                        if (S_ISREG(inode->i_mode)) {
                                rc = filemap_fdatawrite(inode->i_mapping);
                                if (CIFS_I(inode)->clientCanCacheRead == 0) {
                                        waitrc = filemap_fdatawait(
                                                              inode->i_mapping);
                                        invalidate_remote_inode(inode);
                                }
                                if (rc == 0)
                                        rc = waitrc;
                        } else
                                rc = 0;
                        /* mutex_unlock(&inode->i_mutex);*/
                        if (rc)
                                CIFS_I(inode)->write_behind_rc = rc;
                        cFYI(1, ("Oplock flush inode %p rc %d",
                                inode, rc));

                                /* releasing stale oplock after recent reconnect
                                of smb session using a now incorrect file
                                handle is not a data integrity issue but do
                                not bother sending an oplock release if session
                                to server still is disconnected since oplock
                                already released by the server in that case */
                        if (pTcon->tidStatus != CifsNeedReconnect) {
                                rc = CIFSSMBLock(0, pTcon, netfid,
                                                0 /* len */ , 0 /* offset */, 0,
                                                0, LOCKING_ANDX_OPLOCK_RELEASE,
                                                false /* wait flag */);
                                cFYI(1, ("Oplock release rc = %d", rc));
                        }
                        set_current_state(TASK_INTERRUPTIBLE);
                        schedule_timeout(1);  /* yield in case q were corrupt */
                }
        } while (!kthread_should_stop());

        return 0;
}

static int cifs_dnotify_thread(void *dummyarg)
{
        struct list_head *tmp;
        struct cifsSesInfo *ses;

        do {
                if (try_to_freeze())
                        continue;
                set_current_state(TASK_INTERRUPTIBLE);
                schedule_timeout(15*HZ);
                read_lock(&GlobalSMBSeslock);
                /* check if any stuck requests that need
                   to be woken up and wakeq so the
                   thread can wake up and error out */
                list_for_each(tmp, &GlobalSMBSessionList) {
                        ses = list_entry(tmp, struct cifsSesInfo,
                                cifsSessionList);
                        if (ses->server && atomic_read(&ses->server->inFlight))
                                wake_up_all(&ses->server->response_q);
                }
                read_unlock(&GlobalSMBSeslock);
        } while (!kthread_should_stop());

        return 0;
}

static int __init
init_cifs(void)
{
        int rc = 0;
        cifs_proc_init();
/*      INIT_LIST_HEAD(&GlobalServerList);*/    /* BB not implemented yet */
        INIT_LIST_HEAD(&GlobalSMBSessionList);
        INIT_LIST_HEAD(&GlobalTreeConnectionList);
        INIT_LIST_HEAD(&GlobalOplock_Q);
#ifdef CONFIG_CIFS_EXPERIMENTAL
        INIT_LIST_HEAD(&GlobalDnotifyReqList);
        INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
#endif
/*
 *  Initialize Global counters
 */
        atomic_set(&sesInfoAllocCount, 0);
        atomic_set(&tconInfoAllocCount, 0);
        atomic_set(&tcpSesAllocCount, 0);
        atomic_set(&tcpSesReconnectCount, 0);
        atomic_set(&tconInfoReconnectCount, 0);

        atomic_set(&bufAllocCount, 0);
        atomic_set(&smBufAllocCount, 0);
#ifdef CONFIG_CIFS_STATS2
        atomic_set(&totBufAllocCount, 0);
        atomic_set(&totSmBufAllocCount, 0);
#endif /* CONFIG_CIFS_STATS2 */

        atomic_set(&midCount, 0);
        GlobalCurrentXid = 0;
        GlobalTotalActiveXid = 0;
        GlobalMaxActiveXid = 0;
        memset(Local_System_Name, 0, 15);
        rwlock_init(&GlobalSMBSeslock);
        spin_lock_init(&GlobalMid_Lock);

        if (cifs_max_pending < 2) {
                cifs_max_pending = 2;
                cFYI(1, ("cifs_max_pending set to min of 2"));
        } else if (cifs_max_pending > 256) {
                cifs_max_pending = 256;
                cFYI(1, ("cifs_max_pending set to max of 256"));
        }

        rc = cifs_init_inodecache();
        if (rc)
                goto out_clean_proc;

        rc = cifs_init_mids();
        if (rc)
                goto out_destroy_inodecache;

        rc = cifs_init_request_bufs();
        if (rc)
                goto out_destroy_mids;

        rc = register_filesystem(&cifs_fs_type);
        if (rc)
                goto out_destroy_request_bufs;
#ifdef CONFIG_CIFS_UPCALL
        rc = register_key_type(&cifs_spnego_key_type);
        if (rc)
                goto out_unregister_filesystem;
#endif
#ifdef CONFIG_CIFS_DFS_UPCALL
        rc = register_key_type(&key_type_dns_resolver);
        if (rc)
                goto out_unregister_key_type;
#endif
        oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
        if (IS_ERR(oplockThread)) {
                rc = PTR_ERR(oplockThread);
                cERROR(1, ("error %d create oplock thread", rc));
                goto out_unregister_dfs_key_type;
        }

        dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
        if (IS_ERR(dnotifyThread)) {
                rc = PTR_ERR(dnotifyThread);
                cERROR(1, ("error %d create dnotify thread", rc));
                goto out_stop_oplock_thread;
        }

        return 0;

 out_stop_oplock_thread:
        kthread_stop(oplockThread);
 out_unregister_dfs_key_type:
#ifdef CONFIG_CIFS_DFS_UPCALL
        unregister_key_type(&key_type_dns_resolver);
 out_unregister_key_type:
#endif
#ifdef CONFIG_CIFS_UPCALL
        unregister_key_type(&cifs_spnego_key_type);
 out_unregister_filesystem:
#endif
        unregister_filesystem(&cifs_fs_type);
 out_destroy_request_bufs:
        cifs_destroy_request_bufs();
 out_destroy_mids:
        cifs_destroy_mids();
 out_destroy_inodecache:
        cifs_destroy_inodecache();
 out_clean_proc:
        cifs_proc_clean();
        return rc;
}

static void __exit
exit_cifs(void)
{
        cFYI(DBG2, ("exit_cifs"));
        cifs_proc_clean();
#ifdef CONFIG_CIFS_DFS_UPCALL
        cifs_dfs_release_automount_timer();
        unregister_key_type(&key_type_dns_resolver);
#endif
#ifdef CONFIG_CIFS_UPCALL
        unregister_key_type(&cifs_spnego_key_type);
#endif
        unregister_filesystem(&cifs_fs_type);
        cifs_destroy_inodecache();
        cifs_destroy_mids();
        cifs_destroy_request_bufs();
        kthread_stop(oplockThread);
        kthread_stop(dnotifyThread);
}

MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
MODULE_DESCRIPTION
    ("VFS to access servers complying with the SNIA CIFS Specification "
     "e.g. Samba and Windows");
MODULE_VERSION(CIFS_VERSION);
module_init(init_cifs)
module_exit(exit_cifs)

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