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author	Paul Mackerras <paulus@samba.org>	2006-08-30 02:10:47 -0400
committer	Paul Mackerras <paulus@samba.org>	2006-08-30 02:10:47 -0400
commit	467c37801c453849a2fe243c3226476ee3985868 (patch)
tree	b1e9dedf59ff9144945cb711a96274f4ca9bce62 /net/ipv4/fib_semantics.c
parent	e0d872d536bb93335d5905b09fe374a163486d43 (diff)

[POWERPC] Fix irq enable/disable in smp_generic_take_timebase

Eran Ben-Avi <eranpublic@yahoo.com> pointed out that the arch/ppc version of smp_generic_take_timebase disables interrupts on entry but exits without restoring them. However, both it and the arch/powerpc version have another problem, which is that they use local_irq_disable/enable rather than local_irq_save/restore, and they are called with interrupts disabled. This fixes both problems; it changes a return to a break in the arch/ppc version, and changes both versions to use local_irq_save/restore. Signed-off-by: Paul Mackerras <paulus@samba.org>

Diffstat (limited to 'net/ipv4/fib_semantics.c')

0 files changed, 0 insertions, 0 deletions

gt; 2005-04-16 18:20:36 -0400 committer Linus Torvalds <torvalds@ppc970.osdl.org> 2005-04-16 18:20:36 -0400 Linux-2.6.12-rc2' href='/cgit/cgit.cgi/litmus-rt-ext-res.git/commit/fs/cifs/cifsfs.c?id=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2'>1da177e4c3f4

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/*
 *   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 <linux/namei.h>
#include <linux/random.h>
#include <linux/uuid.h>
#include <linux/xattr.h>
#include <net/ipv6.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"
#include "fscache.h"
#include "smb2pdu.h"

int cifsFYI = 0;
bool traceSMB;
bool enable_oplocks = true;
bool linuxExtEnabled = true;
bool lookupCacheEnabled = true;
bool disable_legacy_dialects; /* false by default */
unsigned int global_secflags = CIFSSEC_DEF;
/* unsigned int ntlmv2_support = 0; */
unsigned int sign_CIFS_PDUs = 1;
static const struct super_operations cifs_super_ops;
unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
module_param(CIFSMaxBufSize, uint, 0444);
MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header) "
				 "for CIFS requests. "
				 "Default: 16384 Range: 8192 to 130048");
unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
module_param(cifs_min_rcv, uint, 0444);
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, uint, 0444);
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, uint, 0444);
MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for "
				   "CIFS/SMB1 dialect (N/A for SMB3) "
				   "Default: 32767 Range: 2 to 32767.");
module_param(enable_oplocks, bool, 0644);
MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");

module_param(disable_legacy_dialects, bool, 0644);
MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be "
				  "helpful to restrict the ability to "
				  "override the default dialects (SMB2.1, "
				  "SMB3 and SMB3.02) on mount with old "
				  "dialects (CIFS/SMB1 and SMB2) since "
				  "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker"
				  " and less secure. Default: n/N/0");

extern mempool_t *cifs_sm_req_poolp;
extern mempool_t *cifs_req_poolp;
extern mempool_t *cifs_mid_poolp;

struct workqueue_struct	*cifsiod_wq;
struct workqueue_struct	*cifsoplockd_wq;
__u32 cifs_lock_secret;

/*
 * Bumps refcount for cifs super block.
 * Note that it should be only called if a referece to VFS super block is
 * already held, e.g. in open-type syscalls context. Otherwise it can race with
 * atomic_dec_and_test in deactivate_locked_super.
 */
void
cifs_sb_active(struct super_block *sb)
{
	struct cifs_sb_info *server = CIFS_SB(sb);

	if (atomic_inc_return(&server->active) == 1)
		atomic_inc(&sb->s_active);
}

void
cifs_sb_deactive(struct super_block *sb)
{
	struct cifs_sb_info *server = CIFS_SB(sb);

	if (atomic_dec_and_test(&server->active))
		deactivate_super(sb);
}

static int
cifs_read_super(struct super_block *sb)
{
	struct inode *inode;
	struct cifs_sb_info *cifs_sb;
	struct cifs_tcon *tcon;
	int rc = 0;

	cifs_sb = CIFS_SB(sb);
	tcon = cifs_sb_master_tcon(cifs_sb);

	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
		sb->s_flags |= SB_POSIXACL;

	if (tcon->snapshot_time)
		sb->s_flags |= SB_RDONLY;

	if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
		sb->s_maxbytes = MAX_LFS_FILESIZE;
	else
		sb->s_maxbytes = MAX_NON_LFS;

	/* BB FIXME fix time_gran to be larger for LANMAN sessions */
	sb->s_time_gran = 100;

	sb->s_magic = CIFS_MAGIC_NUMBER;
	sb->s_op = &cifs_super_ops;
	sb->s_xattr = cifs_xattr_handlers;
	rc = super_setup_bdi(sb);
	if (rc)
		goto out_no_root;
	/* tune readahead according to rsize */
	sb->s_bdi->ra_pages = cifs_sb->rsize / PAGE_SIZE;

	sb->s_blocksize = CIFS_MAX_MSGSIZE;
	sb->s_blocksize_bits = 14;	/* default 2**14 = CIFS_MAX_MSGSIZE */
	inode = cifs_root_iget(sb);

	if (IS_ERR(inode)) {
		rc = PTR_ERR(inode);
		goto out_no_root;
	}

	if (tcon->nocase)
		sb->s_d_op = &cifs_ci_dentry_ops;
	else
		sb->s_d_op = &cifs_dentry_ops;

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

#ifdef CONFIG_CIFS_NFSD_EXPORT
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
		cifs_dbg(FYI, "export ops supported\n");
		sb->s_export_op = &cifs_export_ops;
	}
#endif /* CONFIG_CIFS_NFSD_EXPORT */

	return 0;

out_no_root:
	cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
	return rc;
}

static void cifs_kill_sb(struct super_block *sb)
{
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	kill_anon_super(sb);
	cifs_umount(cifs_sb);
}

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 cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
	struct TCP_Server_Info *server = tcon->ses->server;
	unsigned int xid;
	int rc = 0;

	xid = get_xid();

	if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
		buf->f_namelen =
		       le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
	else
		buf->f_namelen = PATH_MAX;

	buf->f_fsid.val[0] = tcon->vol_serial_number;
	/* are using part of create time for more randomness, see man statfs */
	buf->f_fsid.val[1] =  (int)le64_to_cpu(tcon->vol_create_time);

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

	if (server->ops->queryfs)
		rc = server->ops->queryfs(xid, tcon, buf);

	free_xid(xid);
	return 0;
}

static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
{
	struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
	struct TCP_Server_Info *server = tcon->ses->server;

	if (server->ops->fallocate)
		return server->ops->fallocate(file, tcon, mode, off, len);

	return -EOPNOTSUPP;
}

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) {
		if ((mask & MAY_EXEC) && !execute_ok(inode))
			return -EACCES;
		else
			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);
}

static struct kmem_cache *cifs_inode_cachep;
static struct kmem_cache *cifs_req_cachep;
static struct kmem_cache *cifs_mid_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 */
	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_set_oplock_level(cifs_inode, 0);
	cifs_inode->flags = 0;
	spin_lock_init(&cifs_inode->writers_lock);
	cifs_inode->writers = 0;
	cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
	cifs_inode->server_eof = 0;
	cifs_inode->uniqueid = 0;
	cifs_inode->createtime = 0;
	cifs_inode->epoch = 0;
	generate_random_uuid(cifs_inode->lease_key);

	/*
	 * 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);
	INIT_LIST_HEAD(&cifs_inode->llist);
	return &cifs_inode->vfs_inode;
}

static void cifs_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
}

static void
cifs_destroy_inode(struct inode *inode)
{
	call_rcu(&inode->i_rcu, cifs_i_callback);
}

static void
cifs_evict_inode(struct inode *inode)
{
	truncate_inode_pages_final(&inode->i_data);
	clear_inode(inode);
	cifs_fscache_release_inode_cookie(inode);
}

static void
cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
{
	struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
	struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;

	seq_puts(s, ",addr=");

	switch (server->dstaddr.ss_family) {
	case AF_INET:
		seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
		break;
	case AF_INET6:
		seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
		if (sa6->sin6_scope_id)
			seq_printf(s, "%%%u", sa6->sin6_scope_id);
		break;
	default:
		seq_puts(s, "(unknown)");
	}
	if (server->rdma)
		seq_puts(s, ",rdma");
}

static void
cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
{
	if (ses->sectype == Unspecified) {
		if (ses->user_name == NULL)
			seq_puts(s, ",sec=none");
		return;
	}

	seq_puts(s, ",sec=");

	switch (ses->sectype) {
	case LANMAN:
		seq_puts(s, "lanman");
		break;
	case NTLMv2:
		seq_puts(s, "ntlmv2");
		break;
	case NTLM:
		seq_puts(s, "ntlm");
		break;
	case Kerberos:
		seq_puts(s, "krb5");
		break;
	case RawNTLMSSP:
		seq_puts(s, "ntlmssp");
		break;
	default:
		/* shouldn't ever happen */
		seq_puts(s, "unknown");
		break;
	}

	if (ses->sign)
		seq_puts(s, "i");
}

static void
cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
{
	seq_puts(s, ",cache=");

	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
		seq_puts(s, "strict");
	else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
		seq_puts(s, "none");
	else
		seq_puts(s, "loose");
}

static void
cifs_show_nls(struct seq_file *s, struct nls_table *cur)
{
	struct nls_table *def;

	/* Display iocharset= option if it's not default charset */
	def = load_nls_default();
	if (def != cur)
		seq_printf(s, ",iocharset=%s", cur->charset);
	unload_nls(def);
}

/*
 * 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 dentry *root)
{
	struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
	struct sockaddr *srcaddr;
	srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;

	seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
	cifs_show_security(s, tcon->ses);
	cifs_show_cache_flavor(s, cifs_sb);

	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
		seq_puts(s, ",multiuser");
	else if (tcon->ses->user_name)
		seq_show_option(s, "username", tcon->ses->user_name);

	if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
		seq_show_option(s, "domain", tcon->ses->domainName);

	if (srcaddr->sa_family != AF_UNSPEC) {
		struct sockaddr_in *saddr4;
		struct sockaddr_in6 *saddr6;
		saddr4 = (struct sockaddr_in *)srcaddr;
		saddr6 = (struct sockaddr_in6 *)srcaddr;
		if (srcaddr->sa_family == AF_INET6)
			seq_printf(s, ",srcaddr=%pI6c",
				   &saddr6->sin6_addr);
		else if (srcaddr->sa_family == AF_INET)
			seq_printf(s, ",srcaddr=%pI4",
				   &saddr4->sin_addr.s_addr);
		else
			seq_printf(s, ",srcaddr=BAD-AF:%i",
				   (int)(srcaddr->sa_family));
	}

	seq_printf(s, ",uid=%u",
		   from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
		seq_puts(s, ",forceuid");
	else
		seq_puts(s, ",noforceuid");

	seq_printf(s, ",gid=%u",
		   from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
		seq_puts(s, ",forcegid");
	else
		seq_puts(s, ",noforcegid");

	cifs_show_address(s, tcon->ses->server);

	if (!tcon->unix_ext)
		seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
					   cifs_sb->mnt_file_mode,
					   cifs_sb->mnt_dir_mode);

	cifs_show_nls(s, cifs_sb->local_nls);

	if (tcon->seal)
		seq_puts(s, ",seal");
	if (tcon->nocase)
		seq_puts(s, ",nocase");
	if (tcon->retry)
		seq_puts(s, ",hard");
	else
		seq_puts(s, ",soft");
	if (tcon->use_persistent)
		seq_puts(s, ",persistenthandles");
	else if (tcon->use_resilient)
		seq_puts(s, ",resilienthandles");
	if (tcon->posix_extensions)
		seq_puts(s, ",posix");
	else if (tcon->unix_ext)
		seq_puts(s, ",unix");
	else
		seq_puts(s, ",nounix");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
		seq_puts(s, ",posixpaths");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
		seq_puts(s, ",setuids");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
		seq_puts(s, ",idsfromsid");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
		seq_puts(s, ",serverino");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
		seq_puts(s, ",rwpidforward");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
		seq_puts(s, ",forcemand");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
		seq_puts(s, ",nouser_xattr");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
		seq_puts(s, ",mapchars");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
		seq_puts(s, ",mapposix");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
		seq_puts(s, ",sfu");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
		seq_puts(s, ",nobrl");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
		seq_puts(s, ",nohandlecache");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
		seq_puts(s, ",cifsacl");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
		seq_puts(s, ",dynperm");
	if (root->d_sb->s_flags & SB_POSIXACL)
		seq_puts(s, ",acl");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
		seq_puts(s, ",mfsymlinks");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
		seq_puts(s, ",fsc");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
		seq_puts(s, ",nostrictsync");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
		seq_puts(s, ",noperm");
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
		seq_printf(s, ",backupuid=%u",
			   from_kuid_munged(&init_user_ns,
					    cifs_sb->mnt_backupuid));
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
		seq_printf(s, ",backupgid=%u",
			   from_kgid_munged(&init_user_ns,
					    cifs_sb->mnt_backupgid));

	seq_printf(s, ",rsize=%u", cifs_sb->rsize);
	seq_printf(s, ",wsize=%u", cifs_sb->wsize);
	seq_printf(s, ",echo_interval=%lu",
			tcon->ses->server->echo_interval / HZ);
	if (tcon->snapshot_time)
		seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
	/* convert actimeo and display it in seconds */
	seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);

	return 0;
}

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

	if (cifs_sb == NULL)
		return;

	tcon = cifs_sb_master_tcon(cifs_sb);

	spin_lock(&cifs_tcp_ses_lock);
	if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
		/* we have other mounts to same share or we have
		   already tried to force umount this and woken up
		   all waiting network requests, nothing to do */
		spin_unlock(&cifs_tcp_ses_lock);
		return;
	} else if (tcon->tc_count == 1)
		tcon->tidStatus = CifsExiting;
	spin_unlock(&cifs_tcp_ses_lock);

	/* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
	/* cancel_notify_requests(tcon); */
	if (tcon->ses && tcon->ses->server) {
		cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
		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);
	}

	return;
}

#ifdef CONFIG_CIFS_STATS2
static int cifs_show_stats(struct seq_file *s, struct dentry *root)
{
	/* BB FIXME */
	return 0;
}
#endif

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

static int cifs_drop_inode(struct inode *inode)
{
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);

	/* no serverino => unconditional eviction */
	return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
		generic_drop_inode(inode);
}

static const struct super_operations cifs_super_ops = {
	.statfs = cifs_statfs,
	.alloc_inode = cifs_alloc_inode,
	.destroy_inode = cifs_destroy_inode,
	.drop_inode	= cifs_drop_inode,
	.evict_inode	= cifs_evict_inode,
/*	.delete_inode	= cifs_delete_inode,  */  /* Do not need above
	function 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
};

/*
 * Get root dentry from superblock according to prefix path mount option.
 * Return dentry with refcount + 1 on success and NULL otherwise.
 */
static struct dentry *
cifs_get_root(struct smb_vol *vol, struct super_block *sb)
{
	struct dentry *dentry;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	char *full_path = NULL;
	char *s, *p;
	char sep;

	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
		return dget(sb->s_root);

	full_path = cifs_build_path_to_root(vol, cifs_sb,
				cifs_sb_master_tcon(cifs_sb), 0);
	if (full_path == NULL)
		return ERR_PTR(-ENOMEM);

	cifs_dbg(FYI, "Get root dentry for %s\n", full_path);

	sep = CIFS_DIR_SEP(cifs_sb);
	dentry = dget(sb->s_root);
	p = s = full_path;

	do {
		struct inode *dir = d_inode(dentry);
		struct dentry *child;

		if (!dir) {
			dput(dentry);
			dentry = ERR_PTR(-ENOENT);
			break;
		}
		if (!S_ISDIR(dir->i_mode)) {
			dput(dentry);
			dentry = ERR_PTR(-ENOTDIR);
			break;
		}

		/* skip separators */
		while (*s == sep)
			s++;
		if (!*s)
			break;
		p = s++;
		/* next separator */
		while (*s && *s != sep)
			s++;

		child = lookup_one_len_unlocked(p, dentry, s - p);
		dput(dentry);
		dentry = child;
	} while (!IS_ERR(dentry));
	kfree(full_path);
	return dentry;
}

static int cifs_set_super(struct super_block *sb, void *data)
{
	struct cifs_mnt_data *mnt_data = data;
	sb->s_fs_info = mnt_data->cifs_sb;
	return set_anon_super(sb, NULL);
}

static struct dentry *
cifs_smb3_do_mount(struct file_system_type *fs_type,
	      int flags, const char *dev_name, void *data, bool is_smb3)
{
	int rc;
	struct super_block *sb;
	struct cifs_sb_info *cifs_sb;
	struct smb_vol *volume_info;
	struct cifs_mnt_data mnt_data;
	struct dentry *root;

	cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);

	volume_info = cifs_get_volume_info((char *)data, dev_name, is_smb3);
	if (IS_ERR(volume_info))
		return ERR_CAST(volume_info);

	cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
	if (cifs_sb == NULL) {
		root = ERR_PTR(-ENOMEM);
		goto out_nls;
	}

	cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
	if (cifs_sb->mountdata == NULL) {
		root = ERR_PTR(-ENOMEM);
		goto out_free;
	}

	rc = cifs_setup_cifs_sb(volume_info, cifs_sb);
	if (rc) {
		root = ERR_PTR(rc);
		goto out_free;
	}


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