Merge tag '5.20-rc-smb3-client-fixes-part2' of git://git.samba.org/sfrench/cifs-2.6

Pull more cifs updates from Steve French:

 - two fixes for stable, one for a lock length miscalculation, and
   another fixes a lease break timeout bug

 - improvement to handle leases, allows the close timeout to be
   configured more safely

 - five restructuring/cleanup patches

* tag '5.20-rc-smb3-client-fixes-part2' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: Do not access tcon->cfids->cfid directly from is_path_accessible
  cifs: Add constructor/destructors for tcon->cfid
  SMB3: fix lease break timeout when multiple deferred close handles for the same file.
  smb3: allow deferred close timeout to be configurable
  cifs: Do not use tcon->cfid directly, use the cfid we get from open_cached_dir
  cifs: Move cached-dir functions into a separate file
  cifs: Remove {cifs,nfs}_fscache_release_page()
  cifs: fix lock length calculation

fs/cifs/Makefile

@@ -7,7 +7,7 @@ obj-$(CONFIG_CIFS) += cifs.o
 
 cifs-y := trace.o cifsfs.o cifs_debug.o connect.o dir.o file.o \
 	  inode.o link.o misc.o netmisc.o smbencrypt.o transport.o \
-	  cifs_unicode.o nterr.o cifsencrypt.o \
+	  cached_dir.o cifs_unicode.o nterr.o cifsencrypt.o \
 	  readdir.o ioctl.o sess.o export.o unc.o winucase.o \
 	  smb2ops.o smb2maperror.o smb2transport.o \
 	  smb2misc.o smb2pdu.o smb2inode.o smb2file.o cifsacl.o fs_context.o \

fs/cifs/cached_dir.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  Functions to handle the cached directory entries
+ *
+ *  Copyright (c) 2022, Ronnie Sahlberg <lsahlber@redhat.com>
+ */
+
+#include "cifsglob.h"
+#include "cifsproto.h"
+#include "cifs_debug.h"
+#include "smb2proto.h"
+#include "cached_dir.h"
+
+/*
+ * Open the and cache a directory handle.
+ * If error then *cfid is not initialized.
+ */
+int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
+		    const char *path,
+		    struct cifs_sb_info *cifs_sb,
+		    bool lookup_only, struct cached_fid **ret_cfid)
+{
+	struct cifs_ses *ses;
+	struct TCP_Server_Info *server;
+	struct cifs_open_parms oparms;
+	struct smb2_create_rsp *o_rsp = NULL;
+	struct smb2_query_info_rsp *qi_rsp = NULL;
+	int resp_buftype[2];
+	struct smb_rqst rqst[2];
+	struct kvec rsp_iov[2];
+	struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
+	struct kvec qi_iov[1];
+	int rc, flags = 0;
+	__le16 utf16_path = 0; /* Null - since an open of top of share */
+	u8 oplock = SMB2_OPLOCK_LEVEL_II;
+	struct cifs_fid *pfid;
+	struct dentry *dentry;
+	struct cached_fid *cfid;
+
+	if (tcon == NULL || tcon->nohandlecache ||
+	    is_smb1_server(tcon->ses->server))
+		return -EOPNOTSUPP;
+
+	ses = tcon->ses;
+	server = ses->server;
+
+	if (cifs_sb->root == NULL)
+		return -ENOENT;
+
+	if (strlen(path))
+		return -ENOENT;
+
+	dentry = cifs_sb->root;
+
+	cfid = tcon->cfid;
+	mutex_lock(&cfid->fid_mutex);
+	if (cfid->is_valid) {
+		cifs_dbg(FYI, "found a cached root file handle\n");
+		*ret_cfid = cfid;
+		kref_get(&cfid->refcount);
+		mutex_unlock(&cfid->fid_mutex);
+		return 0;
+	}
+
+	/*
+	 * We do not hold the lock for the open because in case
+	 * SMB2_open needs to reconnect, it will end up calling
+	 * cifs_mark_open_files_invalid() which takes the lock again
+	 * thus causing a deadlock
+	 */
+	mutex_unlock(&cfid->fid_mutex);
+
+	if (lookup_only)
+		return -ENOENT;
+
+	if (smb3_encryption_required(tcon))
+		flags |= CIFS_TRANSFORM_REQ;
+
+	if (!server->ops->new_lease_key)
+		return -EIO;
+
+	pfid = &cfid->fid;
+	server->ops->new_lease_key(pfid);
+
+	memset(rqst, 0, sizeof(rqst));
+	resp_buftype[0] = resp_buftype[1] = CIFS_NO_BUFFER;
+	memset(rsp_iov, 0, sizeof(rsp_iov));
+
+	/* Open */
+	memset(&open_iov, 0, sizeof(open_iov));
+	rqst[0].rq_iov = open_iov;
+	rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
+
+	oparms.tcon = tcon;
+	oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_FILE);
+	oparms.desired_access = FILE_READ_ATTRIBUTES;
+	oparms.disposition = FILE_OPEN;
+	oparms.fid = pfid;
+	oparms.reconnect = false;
+
+	rc = SMB2_open_init(tcon, server,
+			    &rqst[0], &oplock, &oparms, &utf16_path);
+	if (rc)
+		goto oshr_free;
+	smb2_set_next_command(tcon, &rqst[0]);
+
+	memset(&qi_iov, 0, sizeof(qi_iov));
+	rqst[1].rq_iov = qi_iov;
+	rqst[1].rq_nvec = 1;
+
+	rc = SMB2_query_info_init(tcon, server,
+				  &rqst[1], COMPOUND_FID,
+				  COMPOUND_FID, FILE_ALL_INFORMATION,
+				  SMB2_O_INFO_FILE, 0,
+				  sizeof(struct smb2_file_all_info) +
+				  PATH_MAX * 2, 0, NULL);
+	if (rc)
+		goto oshr_free;
+
+	smb2_set_related(&rqst[1]);
+
+	rc = compound_send_recv(xid, ses, server,
+				flags, 2, rqst,
+				resp_buftype, rsp_iov);
+	mutex_lock(&cfid->fid_mutex);
+
+	/*
+	 * Now we need to check again as the cached root might have
+	 * been successfully re-opened from a concurrent process
+	 */
+
+	if (cfid->is_valid) {
+		/* work was already done */
+
+		/* stash fids for close() later */
+		struct cifs_fid fid = {
+			.persistent_fid = pfid->persistent_fid,
+			.volatile_fid = pfid->volatile_fid,
+		};
+
+		/*
+		 * caller expects this func to set the fid in cfid to valid
+		 * cached root, so increment the refcount.
+		 */
+		kref_get(&cfid->refcount);
+
+		mutex_unlock(&cfid->fid_mutex);
+
+		if (rc == 0) {
+			/* close extra handle outside of crit sec */
+			SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+		}
+		rc = 0;
+		goto oshr_free;
+	}
+
+	/* Cached root is still invalid, continue normaly */
+
+	if (rc) {
+		if (rc == -EREMCHG) {
+			tcon->need_reconnect = true;
+			pr_warn_once("server share %s deleted\n",
+				     tcon->treeName);
+		}
+		goto oshr_exit;
+	}
+
+	atomic_inc(&tcon->num_remote_opens);
+
+	o_rsp = (struct smb2_create_rsp *)rsp_iov[0].iov_base;
+	oparms.fid->persistent_fid = o_rsp->PersistentFileId;
+	oparms.fid->volatile_fid = o_rsp->VolatileFileId;
+#ifdef CONFIG_CIFS_DEBUG2
+	oparms.fid->mid = le64_to_cpu(o_rsp->hdr.MessageId);
+#endif /* CIFS_DEBUG2 */
+
+	cfid->tcon = tcon;
+	cfid->is_valid = true;
+	cfid->dentry = dentry;
+	dget(dentry);
+	kref_init(&cfid->refcount);
+
+	/* BB TBD check to see if oplock level check can be removed below */
+	if (o_rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE) {
+		/*
+		 * See commit 2f94a3125b87. Increment the refcount when we
+		 * get a lease for root, release it if lease break occurs
+		 */
+		kref_get(&cfid->refcount);
+		cfid->has_lease = true;
+		smb2_parse_contexts(server, o_rsp,
+				&oparms.fid->epoch,
+				    oparms.fid->lease_key, &oplock,
+				    NULL, NULL);
+	} else
+		goto oshr_exit;
+
+	qi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
+	if (le32_to_cpu(qi_rsp->OutputBufferLength) < sizeof(struct smb2_file_all_info))
+		goto oshr_exit;
+	if (!smb2_validate_and_copy_iov(
+				le16_to_cpu(qi_rsp->OutputBufferOffset),
+				sizeof(struct smb2_file_all_info),
+				&rsp_iov[1], sizeof(struct smb2_file_all_info),
+				(char *)&cfid->file_all_info))
+		cfid->file_all_info_is_valid = true;
+
+	cfid->time = jiffies;
+
+oshr_exit:
+	mutex_unlock(&cfid->fid_mutex);
+oshr_free:
+	SMB2_open_free(&rqst[0]);
+	SMB2_query_info_free(&rqst[1]);
+	free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
+	free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
+	if (rc == 0)
+		*ret_cfid = cfid;
+
+	return rc;
+}
+
+int open_cached_dir_by_dentry(struct cifs_tcon *tcon,
+			      struct dentry *dentry,
+			      struct cached_fid **ret_cfid)
+{
+	struct cached_fid *cfid;
+
+	cfid = tcon->cfid;
+
+	mutex_lock(&cfid->fid_mutex);
+	if (cfid->dentry == dentry) {
+		cifs_dbg(FYI, "found a cached root file handle by dentry\n");
+		*ret_cfid = cfid;
+		kref_get(&cfid->refcount);
+		mutex_unlock(&cfid->fid_mutex);
+		return 0;
+	}
+	mutex_unlock(&cfid->fid_mutex);
+	return -ENOENT;
+}
+
+static void
+smb2_close_cached_fid(struct kref *ref)
+{
+	struct cached_fid *cfid = container_of(ref, struct cached_fid,
+					       refcount);
+	struct cached_dirent *dirent, *q;
+
+	if (cfid->is_valid) {
+		cifs_dbg(FYI, "clear cached root file handle\n");
+		SMB2_close(0, cfid->tcon, cfid->fid.persistent_fid,
+			   cfid->fid.volatile_fid);
+	}
+
+	/*
+	 * We only check validity above to send SMB2_close,
+	 * but we still need to invalidate these entries
+	 * when this function is called
+	 */
+	cfid->is_valid = false;
+	cfid->file_all_info_is_valid = false;
+	cfid->has_lease = false;
+	if (cfid->dentry) {
+		dput(cfid->dentry);
+		cfid->dentry = NULL;
+	}
+	/*
+	 * Delete all cached dirent names
+	 */
+	mutex_lock(&cfid->dirents.de_mutex);
+	list_for_each_entry_safe(dirent, q, &cfid->dirents.entries, entry) {
+		list_del(&dirent->entry);
+		kfree(dirent->name);
+		kfree(dirent);
+	}
+	cfid->dirents.is_valid = 0;
+	cfid->dirents.is_failed = 0;
+	cfid->dirents.ctx = NULL;
+	cfid->dirents.pos = 0;
+	mutex_unlock(&cfid->dirents.de_mutex);
+
+}
+
+void close_cached_dir(struct cached_fid *cfid)
+{
+	mutex_lock(&cfid->fid_mutex);
+	kref_put(&cfid->refcount, smb2_close_cached_fid);
+	mutex_unlock(&cfid->fid_mutex);
+}
+
+void close_cached_dir_lease_locked(struct cached_fid *cfid)
+{
+	if (cfid->has_lease) {
+		cfid->has_lease = false;
+		kref_put(&cfid->refcount, smb2_close_cached_fid);
+	}
+}
+
+void close_cached_dir_lease(struct cached_fid *cfid)
+{
+	mutex_lock(&cfid->fid_mutex);
+	close_cached_dir_lease_locked(cfid);
+	mutex_unlock(&cfid->fid_mutex);
+}
+
+/*
+ * Called from cifs_kill_sb when we unmount a share
+ */
+void close_all_cached_dirs(struct cifs_sb_info *cifs_sb)
+{
+	struct rb_root *root = &cifs_sb->tlink_tree;
+	struct rb_node *node;
+	struct cached_fid *cfid;
+	struct cifs_tcon *tcon;
+	struct tcon_link *tlink;
+
+	for (node = rb_first(root); node; node = rb_next(node)) {
+		tlink = rb_entry(node, struct tcon_link, tl_rbnode);
+		tcon = tlink_tcon(tlink);
+		if (IS_ERR(tcon))
+			continue;
+		cfid = tcon->cfid;
+		mutex_lock(&cfid->fid_mutex);
+		if (cfid->dentry) {
+			dput(cfid->dentry);
+			cfid->dentry = NULL;
+		}
+		mutex_unlock(&cfid->fid_mutex);
+	}
+}
+
+/*
+ * Invalidate and close all cached dirs when a TCON has been reset
+ * due to a session loss.
+ */
+void invalidate_all_cached_dirs(struct cifs_tcon *tcon)
+{
+	mutex_lock(&tcon->cfid->fid_mutex);
+	tcon->cfid->is_valid = false;
+	/* cached handle is not valid, so SMB2_CLOSE won't be sent below */
+	close_cached_dir_lease_locked(tcon->cfid);
+	memset(&tcon->cfid->fid, 0, sizeof(struct cifs_fid));
+	mutex_unlock(&tcon->cfid->fid_mutex);
+}
+
+static void
+smb2_cached_lease_break(struct work_struct *work)
+{
+	struct cached_fid *cfid = container_of(work,
+				struct cached_fid, lease_break);
+
+	close_cached_dir_lease(cfid);
+}
+
+int cached_dir_lease_break(struct cifs_tcon *tcon, __u8 lease_key[16])
+{
+	if (tcon->cfid->is_valid &&
+	    !memcmp(lease_key,
+		    tcon->cfid->fid.lease_key,
+		    SMB2_LEASE_KEY_SIZE)) {
+		tcon->cfid->time = 0;
+		INIT_WORK(&tcon->cfid->lease_break,
+			  smb2_cached_lease_break);
+		queue_work(cifsiod_wq,
+			   &tcon->cfid->lease_break);
+		return true;
+	}
+	return false;
+}
+
+struct cached_fid *init_cached_dir(void)
+{
+	struct cached_fid *cfid;
+
+	cfid = kzalloc(sizeof(*cfid), GFP_KERNEL);
+	if (!cfid)
+		return NULL;
+	INIT_LIST_HEAD(&cfid->dirents.entries);
+	mutex_init(&cfid->dirents.de_mutex);
+	mutex_init(&cfid->fid_mutex);
+	return cfid;
+}
+
+void free_cached_dir(struct cifs_tcon *tcon)
+{
+	kfree(tcon->cfid);
+}

fs/cifs/cached_dir.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *  Functions to handle the cached directory entries
+ *
+ *  Copyright (c) 2022, Ronnie Sahlberg <lsahlber@redhat.com>
+ */
+
+#ifndef _CACHED_DIR_H
+#define _CACHED_DIR_H
+
+
+struct cached_dirent {
+	struct list_head entry;
+	char *name;
+	int namelen;
+	loff_t pos;
+
+	struct cifs_fattr fattr;
+};
+
+struct cached_dirents {
+	bool is_valid:1;
+	bool is_failed:1;
+	struct dir_context *ctx; /*
+				  * Only used to make sure we only take entries
+				  * from a single context. Never dereferenced.
+				  */
+	struct mutex de_mutex;
+	int pos;		 /* Expected ctx->pos */
+	struct list_head entries;
+};
+
+struct cached_fid {
+	bool is_valid:1;	/* Do we have a useable root fid */
+	bool file_all_info_is_valid:1;
+	bool has_lease:1;
+	unsigned long time; /* jiffies of when lease was taken */
+	struct kref refcount;
+	struct cifs_fid fid;
+	struct mutex fid_mutex;
+	struct cifs_tcon *tcon;
+	struct dentry *dentry;
+	struct work_struct lease_break;
+	struct smb2_file_all_info file_all_info;
+	struct cached_dirents dirents;
+};
+
+extern struct cached_fid *init_cached_dir(void);
+extern void free_cached_dir(struct cifs_tcon *tcon);
+extern int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
+			   const char *path,
+			   struct cifs_sb_info *cifs_sb,
+			   bool lookup_only, struct cached_fid **cfid);
+extern int open_cached_dir_by_dentry(struct cifs_tcon *tcon,
+				     struct dentry *dentry,
+				     struct cached_fid **cfid);
+extern void close_cached_dir(struct cached_fid *cfid);
+extern void close_cached_dir_lease(struct cached_fid *cfid);
+extern void close_cached_dir_lease_locked(struct cached_fid *cfid);
+extern void close_all_cached_dirs(struct cifs_sb_info *cifs_sb);
+extern void invalidate_all_cached_dirs(struct cifs_tcon *tcon);
+extern int cached_dir_lease_break(struct cifs_tcon *tcon, __u8 lease_key[16]);
+
+#endif			/* _CACHED_DIR_H */

fs/cifs/cifsfs.c

@@ -46,6 +46,7 @@
 #include "netlink.h"
 #endif
 #include "fs_context.h"
+#include "cached_dir.h"
 
 /*
  * DOS dates from 1980/1/1 through 2107/12/31
@@ -283,30 +284,13 @@ cifs_read_super(struct super_block *sb)
 static void cifs_kill_sb(struct super_block *sb)
 {
 	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
-	struct cifs_tcon *tcon;
-	struct cached_fid *cfid;
-	struct rb_root *root = &cifs_sb->tlink_tree;
-	struct rb_node *node;
-	struct tcon_link *tlink;
 
 	/*
 	 * We ned to release all dentries for the cached directories
 	 * before we kill the sb.
 	 */
 	if (cifs_sb->root) {
-		for (node = rb_first(root); node; node = rb_next(node)) {
-			tlink = rb_entry(node, struct tcon_link, tl_rbnode);
-			tcon = tlink_tcon(tlink);
-			if (IS_ERR(tcon))
-				continue;
-			cfid = &tcon->crfid;
-			mutex_lock(&cfid->fid_mutex);
-			if (cfid->dentry) {
-				dput(cfid->dentry);
-				cfid->dentry = NULL;
-			}
-			mutex_unlock(&cfid->fid_mutex);
-		}
+		close_all_cached_dirs(cifs_sb);
 
 		/* finally release root dentry */
 		dput(cifs_sb->root);
@@ -709,6 +693,7 @@ cifs_show_options(struct seq_file *s, struct dentry *root)
 		seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ);
 		seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ);
 	}
+	seq_printf(s, ",closetimeo=%lu", cifs_sb->ctx->closetimeo / HZ);
 
 	if (tcon->ses->chan_max > 1)
 		seq_printf(s, ",multichannel,max_channels=%zu",

fs/cifs/cifsglob.h

@@ -1128,42 +1128,6 @@ struct cifs_fattr {
 	u32             cf_cifstag;
 };
 
-struct cached_dirent {
-	struct list_head entry;
-	char *name;
-	int namelen;
-	loff_t pos;
-
-	struct cifs_fattr fattr;
-};
-
-struct cached_dirents {
-	bool is_valid:1;
-	bool is_failed:1;
-	struct dir_context *ctx; /*
-				  * Only used to make sure we only take entries
-				  * from a single context. Never dereferenced.
-				  */
-	struct mutex de_mutex;
-	int pos;		 /* Expected ctx->pos */
-	struct list_head entries;
-};
-
-struct cached_fid {
-	bool is_valid:1;	/* Do we have a useable root fid */
-	bool file_all_info_is_valid:1;
-	bool has_lease:1;
-	unsigned long time; /* jiffies of when lease was taken */
-	struct kref refcount;
-	struct cifs_fid *fid;
-	struct mutex fid_mutex;
-	struct cifs_tcon *tcon;
-	struct dentry *dentry;
-	struct work_struct lease_break;
-	struct smb2_file_all_info file_all_info;
-	struct cached_dirents dirents;
-};
-
 /*
  * there is one of these for each connection to a resource on a particular
  * session
@@ -1257,7 +1221,7 @@ struct cifs_tcon {
 	struct fscache_volume *fscache;	/* cookie for share */
 #endif
 	struct list_head pending_opens;	/* list of incomplete opens */
-	struct cached_fid crfid; /* Cached root fid */
+	struct cached_fid *cfid; /* Cached root fid */
 	/* BB add field for back pointer to sb struct(s)? */
 #ifdef CONFIG_CIFS_DFS_UPCALL
 	struct list_head ulist; /* cache update list */
@@ -2132,9 +2096,9 @@ static inline bool cifs_is_referral_server(struct cifs_tcon *tcon,
 	return is_tcon_dfs(tcon) || (ref && (ref->flags & DFSREF_REFERRAL_SERVER));
 }
 
-static inline u64 cifs_flock_len(struct file_lock *fl)
+static inline u64 cifs_flock_len(const struct file_lock *fl)
 {
-	return fl->fl_end == OFFSET_MAX ? 0 : fl->fl_end - fl->fl_start + 1;
+	return (u64)fl->fl_end - fl->fl_start + 1;
 }
 
 static inline size_t ntlmssp_workstation_name_size(const struct cifs_ses *ses)

fs/cifs/cifsproto.h

@@ -597,7 +597,6 @@ enum securityEnum cifs_select_sectype(struct TCP_Server_Info *,
 struct cifs_aio_ctx *cifs_aio_ctx_alloc(void);
 void cifs_aio_ctx_release(struct kref *refcount);
 int setup_aio_ctx_iter(struct cifs_aio_ctx *ctx, struct iov_iter *iter, int rw);
-void smb2_cached_lease_break(struct work_struct *work);
 
 int cifs_alloc_hash(const char *name, struct crypto_shash **shash,
 		    struct sdesc **sdesc);

fs/cifs/connect.c

@@ -2681,6 +2681,8 @@ compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
 		return 0;
 	if (old->ctx->acdirmax != new->ctx->acdirmax)
 		return 0;
+	if (old->ctx->closetimeo != new->ctx->closetimeo)
+		return 0;
 
 	return 1;
 }

fs/cifs/file.c

@@ -34,6 +34,7 @@
 #include "smbdirect.h"
 #include "fs_context.h"
 #include "cifs_ioctl.h"
+#include "cached_dir.h"
 
 /*
  * Mark as invalid, all open files on tree connections since they
@@ -64,13 +65,7 @@ cifs_mark_open_files_invalid(struct cifs_tcon *tcon)
 	}
 	spin_unlock(&tcon->open_file_lock);
 
-	mutex_lock(&tcon->crfid.fid_mutex);
-	tcon->crfid.is_valid = false;
-	/* cached handle is not valid, so SMB2_CLOSE won't be sent below */
-	close_cached_dir_lease_locked(&tcon->crfid);
-	memset(tcon->crfid.fid, 0, sizeof(struct cifs_fid));
-	mutex_unlock(&tcon->crfid.fid_mutex);
-
+	invalidate_all_cached_dirs(tcon);
 	spin_lock(&tcon->tc_lock);
 	if (tcon->status == TID_IN_FILES_INVALIDATE)
 		tcon->status = TID_NEED_TCON;
@@ -969,12 +964,12 @@ int cifs_close(struct inode *inode, struct file *file)
 				 * So, Increase the ref count to avoid use-after-free.
 				 */
 				if (!mod_delayed_work(deferredclose_wq,
-						&cfile->deferred, cifs_sb->ctx->acregmax))
+						&cfile->deferred, cifs_sb->ctx->closetimeo))
 					cifsFileInfo_get(cfile);
 			} else {
 				/* Deferred close for files */
 				queue_delayed_work(deferredclose_wq,
-						&cfile->deferred, cifs_sb->ctx->acregmax);
+						&cfile->deferred, cifs_sb->ctx->closetimeo);
 				cfile->deferred_close_scheduled = true;
 				spin_unlock(&cinode->deferred_lock);
 				return 0;
@@ -1936,9 +1931,9 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *flock)
 	rc = -EACCES;
 	xid = get_xid();
 
-	cifs_dbg(FYI, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld end: %lld\n",
-		 cmd, flock->fl_flags, flock->fl_type,
-		 flock->fl_start, flock->fl_end);
+	cifs_dbg(FYI, "%s: %pD2 cmd=0x%x type=0x%x flags=0x%x r=%lld:%lld\n", __func__, file, cmd,
+		 flock->fl_flags, flock->fl_type, (long long)flock->fl_start,
+		 (long long)flock->fl_end);
 
 	cfile = (struct cifsFileInfo *)file->private_data;
 	tcon = tlink_tcon(cfile->tlink);
@@ -5064,8 +5059,6 @@ void cifs_oplock_break(struct work_struct *work)
 	struct TCP_Server_Info *server = tcon->ses->server;
 	int rc = 0;
 	bool purge_cache = false;
-	bool is_deferred = false;
-	struct cifs_deferred_close *dclose;
 
 	wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS,
 			TASK_UNINTERRUPTIBLE);
@@ -5101,22 +5094,6 @@ void cifs_oplock_break(struct work_struct *work)
 		cifs_dbg(VFS, "Push locks rc = %d\n", rc);
 
 oplock_break_ack:
-	/*
-	 * When oplock break is received and there are no active
-	 * file handles but cached, then schedule deferred close immediately.
-	 * So, new open will not use cached handle.
-	 */
-	spin_lock(&CIFS_I(inode)->deferred_lock);
-	is_deferred = cifs_is_deferred_close(cfile, &dclose);
-	spin_unlock(&CIFS_I(inode)->deferred_lock);
-	if (is_deferred &&
-	    cfile->deferred_close_scheduled &&
-	    delayed_work_pending(&cfile->deferred)) {
-		if (cancel_delayed_work(&cfile->deferred)) {
-			_cifsFileInfo_put(cfile, false, false);
-			goto oplock_break_done;
-		}
-	}
 	/*
 	 * releasing stale oplock after recent reconnect of smb session using
 	 * a now incorrect file handle is not a data integrity issue but do
@@ -5128,7 +5105,7 @@ void cifs_oplock_break(struct work_struct *work)
 							     cinode);
 		cifs_dbg(FYI, "Oplock release rc = %d\n", rc);
 	}
-oplock_break_done:
+
 	_cifsFileInfo_put(cfile, false /* do not wait for ourself */, false);
 	cifs_done_oplock_break(cinode);
 }

fs/cifs/fs_context.c

@@ -147,6 +147,7 @@ const struct fs_parameter_spec smb3_fs_parameters[] = {
 	fsparam_u32("actimeo", Opt_actimeo),
 	fsparam_u32("acdirmax", Opt_acdirmax),
 	fsparam_u32("acregmax", Opt_acregmax),
+	fsparam_u32("closetimeo", Opt_closetimeo),
 	fsparam_u32("echo_interval", Opt_echo_interval),
 	fsparam_u32("max_credits", Opt_max_credits),
 	fsparam_u32("handletimeout", Opt_handletimeout),
@@ -1074,6 +1075,13 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
 		}
 		ctx->acdirmax = ctx->acregmax = HZ * result.uint_32;
 		break;
+	case Opt_closetimeo:
+		ctx->closetimeo = HZ * result.uint_32;
+		if (ctx->closetimeo > SMB3_MAX_DCLOSETIMEO) {
+			cifs_errorf(fc, "closetimeo too large\n");
+			goto cifs_parse_mount_err;
+		}
+		break;
 	case Opt_echo_interval:
 		ctx->echo_interval = result.uint_32;
 		break;
@@ -1521,6 +1529,7 @@ int smb3_init_fs_context(struct fs_context *fc)
 
 	ctx->acregmax = CIFS_DEF_ACTIMEO;
 	ctx->acdirmax = CIFS_DEF_ACTIMEO;
+	ctx->closetimeo = SMB3_DEF_DCLOSETIMEO;
 
 	/* Most clients set timeout to 0, allows server to use its default */
 	ctx->handle_timeout = 0; /* See MS-SMB2 spec section 2.2.14.2.12 */

fs/cifs/fs_context.h

@@ -125,6 +125,7 @@ enum cifs_param {
 	Opt_actimeo,
 	Opt_acdirmax,
 	Opt_acregmax,
+	Opt_closetimeo,
 	Opt_echo_interval,
 	Opt_max_credits,
 	Opt_snapshot,
@@ -247,6 +248,8 @@ struct smb3_fs_context {
 	/* attribute cache timemout for files and directories in jiffies */
 	unsigned long acregmax;
 	unsigned long acdirmax;
+	/* timeout for deferred close of files in jiffies */
+	unsigned long closetimeo;
 	struct smb_version_operations *ops;
 	struct smb_version_values *vals;
 	char *prepath;
@@ -279,4 +282,9 @@ static inline struct smb3_fs_context *smb3_fc2context(const struct fs_context *f
 extern int smb3_fs_context_dup(struct smb3_fs_context *new_ctx, struct smb3_fs_context *ctx);
 extern void smb3_update_mnt_flags(struct cifs_sb_info *cifs_sb);
 
+/*
+ * max deferred close timeout (jiffies) - 2^30
+ */
+#define SMB3_MAX_DCLOSETIMEO (1 << 30)
+#define SMB3_DEF_DCLOSETIMEO (5 * HZ) /* Can increase later, other clients use larger */
 #endif

fs/cifs/fscache.h

@@ -108,17 +108,6 @@ static inline void cifs_readpage_to_fscache(struct inode *inode,
 		__cifs_readpage_to_fscache(inode, page);
 }
 
-static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp)
-{
-	if (PageFsCache(page)) {
-		if (current_is_kswapd() || !(gfp & __GFP_FS))
-			return false;
-		wait_on_page_fscache(page);
-		fscache_note_page_release(cifs_inode_cookie(page->mapping->host));
-	}
-	return true;
-}
-
 #else /* CONFIG_CIFS_FSCACHE */
 static inline
 void cifs_fscache_fill_coherency(struct inode *inode,
@@ -154,11 +143,6 @@ cifs_readpage_from_fscache(struct inode *inode, struct page *page)
 static inline
 void cifs_readpage_to_fscache(struct inode *inode, struct page *page) {}
 
-static inline int nfs_fscache_release_page(struct page *page, gfp_t gfp)
-{
-	return true; /* May release page */
-}
-
 #endif /* CONFIG_CIFS_FSCACHE */
 
 #endif /* _CIFS_FSCACHE_H */

fs/cifs/inode.c

@@ -25,6 +25,7 @@
 #include "fscache.h"
 #include "fs_context.h"
 #include "cifs_ioctl.h"
+#include "cached_dir.h"
 
 static void cifs_set_ops(struct inode *inode)
 {

fs/cifs/misc.c

@@ -23,6 +23,7 @@
 #include "dns_resolve.h"
 #endif
 #include "fs_context.h"
+#include "cached_dir.h"
 
 extern mempool_t *cifs_sm_req_poolp;
 extern mempool_t *cifs_req_poolp;
@@ -116,13 +117,11 @@ tconInfoAlloc(void)
 	ret_buf = kzalloc(sizeof(*ret_buf), GFP_KERNEL);
 	if (!ret_buf)
 		return NULL;
-	ret_buf->crfid.fid = kzalloc(sizeof(*ret_buf->crfid.fid), GFP_KERNEL);
-	if (!ret_buf->crfid.fid) {
+	ret_buf->cfid = init_cached_dir();
+	if (!ret_buf->cfid) {
 		kfree(ret_buf);
 		return NULL;
 	}
-	INIT_LIST_HEAD(&ret_buf->crfid.dirents.entries);
-	mutex_init(&ret_buf->crfid.dirents.de_mutex);
 
 	atomic_inc(&tconInfoAllocCount);
 	ret_buf->status = TID_NEW;
@@ -131,7 +130,6 @@ tconInfoAlloc(void)
 	INIT_LIST_HEAD(&ret_buf->openFileList);
 	INIT_LIST_HEAD(&ret_buf->tcon_list);
 	spin_lock_init(&ret_buf->open_file_lock);
-	mutex_init(&ret_buf->crfid.fid_mutex);
 	spin_lock_init(&ret_buf->stat_lock);
 	atomic_set(&ret_buf->num_local_opens, 0);
 	atomic_set(&ret_buf->num_remote_opens, 0);
@@ -140,17 +138,17 @@ tconInfoAlloc(void)
 }
 
 void
-tconInfoFree(struct cifs_tcon *buf_to_free)
+tconInfoFree(struct cifs_tcon *tcon)
 {
-	if (buf_to_free == NULL) {
+	if (tcon == NULL) {
 		cifs_dbg(FYI, "Null buffer passed to tconInfoFree\n");
 		return;
 	}
+	free_cached_dir(tcon);
 	atomic_dec(&tconInfoAllocCount);
-	kfree(buf_to_free->nativeFileSystem);
-	kfree_sensitive(buf_to_free->password);
-	kfree(buf_to_free->crfid.fid);
-	kfree(buf_to_free);
+	kfree(tcon->nativeFileSystem);
+	kfree_sensitive(tcon->password);
+	kfree(tcon);
 }
 
 struct smb_hdr *

fs/cifs/readdir.c

@@ -21,6 +21,7 @@
 #include "cifsfs.h"
 #include "smb2proto.h"
 #include "fs_context.h"
+#include "cached_dir.h"
 
 /*
  * To be safe - for UCS to UTF-8 with strings loaded with the rare long
@@ -1071,7 +1072,7 @@ int cifs_readdir(struct file *file, struct dir_context *ctx)
 		tcon = tlink_tcon(cifsFile->tlink);
 	}
 
-	rc = open_cached_dir(xid, tcon, full_path, cifs_sb, &cfid);
+	rc = open_cached_dir(xid, tcon, full_path, cifs_sb, false, &cfid);
 	cifs_put_tlink(tlink);
 	if (rc)
 		goto cache_not_found;
@@ -1142,7 +1143,7 @@ int cifs_readdir(struct file *file, struct dir_context *ctx)
 	tcon = tlink_tcon(cifsFile->tlink);
 	rc = find_cifs_entry(xid, tcon, ctx->pos, file, full_path,
 			     &current_entry, &num_to_fill);
-	open_cached_dir(xid, tcon, full_path, cifs_sb, &cfid);
+	open_cached_dir(xid, tcon, full_path, cifs_sb, false, &cfid);
 	if (rc) {
 		cifs_dbg(FYI, "fce error %d\n", rc);
 		goto rddir2_exit;

fs/cifs/smb2inode.c

@@ -23,6 +23,7 @@
 #include "smb2glob.h"
 #include "smb2pdu.h"
 #include "smb2proto.h"
+#include "cached_dir.h"
 
 static void
 free_set_inf_compound(struct smb_rqst *rqst)
@@ -515,16 +516,16 @@ smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
 	if (strcmp(full_path, ""))
 		rc = -ENOENT;
 	else
-		rc = open_cached_dir(xid, tcon, full_path, cifs_sb, &cfid);
+		rc = open_cached_dir(xid, tcon, full_path, cifs_sb, false, &cfid);
 	/* If it is a root and its handle is cached then use it */
 	if (!rc) {
-		if (tcon->crfid.file_all_info_is_valid) {
+		if (cfid->file_all_info_is_valid) {
 			move_smb2_info_to_cifs(data,
-					       &tcon->crfid.file_all_info);
+					       &cfid->file_all_info);
 		} else {
 			rc = SMB2_query_info(xid, tcon,
-					     cfid->fid->persistent_fid,
-					     cfid->fid->volatile_fid, smb2_data);
+					     cfid->fid.persistent_fid,
+					     cfid->fid.volatile_fid, smb2_data);
 			if (!rc)
 				move_smb2_info_to_cifs(data, smb2_data);
 		}

fs/cifs/smb2misc.c

@@ -16,6 +16,7 @@
 #include "smb2status.h"
 #include "smb2glob.h"
 #include "nterr.h"
+#include "cached_dir.h"
 
 static int
 check_smb2_hdr(struct smb2_hdr *shdr, __u64 mid)
@@ -648,15 +649,7 @@ smb2_is_valid_lease_break(char *buffer)
 				}
 				spin_unlock(&tcon->open_file_lock);
 
-				if (tcon->crfid.is_valid &&
-				    !memcmp(rsp->LeaseKey,
-					    tcon->crfid.fid->lease_key,
-					    SMB2_LEASE_KEY_SIZE)) {
-					tcon->crfid.time = 0;
-					INIT_WORK(&tcon->crfid.lease_break,
-						  smb2_cached_lease_break);
-					queue_work(cifsiod_wq,
-						   &tcon->crfid.lease_break);
+				if (cached_dir_lease_break(tcon, rsp->LeaseKey)) {
 					spin_unlock(&cifs_tcp_ses_lock);
 					return true;
 				}

fs/cifs/smb2ops.c

@@ -27,6 +27,7 @@
 #include "smbdirect.h"
 #include "fscache.h"
 #include "fs_context.h"
+#include "cached_dir.h"
 
 /* Change credits for different ops and return the total number of credits */
 static int
@@ -701,300 +702,6 @@ SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon)
 	return rc;
 }
 
-static void
-smb2_close_cached_fid(struct kref *ref)
-{
-	struct cached_fid *cfid = container_of(ref, struct cached_fid,
-					       refcount);
-	struct cached_dirent *dirent, *q;
-
-	if (cfid->is_valid) {
-		cifs_dbg(FYI, "clear cached root file handle\n");
-		SMB2_close(0, cfid->tcon, cfid->fid->persistent_fid,
-			   cfid->fid->volatile_fid);
-	}
-
-	/*
-	 * We only check validity above to send SMB2_close,
-	 * but we still need to invalidate these entries
-	 * when this function is called
-	 */
-	cfid->is_valid = false;
-	cfid->file_all_info_is_valid = false;
-	cfid->has_lease = false;
-	if (cfid->dentry) {
-		dput(cfid->dentry);
-		cfid->dentry = NULL;
-	}
-	/*
-	 * Delete all cached dirent names
-	 */
-	mutex_lock(&cfid->dirents.de_mutex);
-	list_for_each_entry_safe(dirent, q, &cfid->dirents.entries, entry) {
-		list_del(&dirent->entry);
-		kfree(dirent->name);
-		kfree(dirent);
-	}
-	cfid->dirents.is_valid = 0;
-	cfid->dirents.is_failed = 0;
-	cfid->dirents.ctx = NULL;
-	cfid->dirents.pos = 0;
-	mutex_unlock(&cfid->dirents.de_mutex);
-
-}
-
-void close_cached_dir(struct cached_fid *cfid)
-{
-	mutex_lock(&cfid->fid_mutex);
-	kref_put(&cfid->refcount, smb2_close_cached_fid);
-	mutex_unlock(&cfid->fid_mutex);
-}
-
-void close_cached_dir_lease_locked(struct cached_fid *cfid)
-{
-	if (cfid->has_lease) {
-		cfid->has_lease = false;
-		kref_put(&cfid->refcount, smb2_close_cached_fid);
-	}
-}
-
-void close_cached_dir_lease(struct cached_fid *cfid)
-{
-	mutex_lock(&cfid->fid_mutex);
-	close_cached_dir_lease_locked(cfid);
-	mutex_unlock(&cfid->fid_mutex);
-}
-
-void
-smb2_cached_lease_break(struct work_struct *work)
-{
-	struct cached_fid *cfid = container_of(work,
-				struct cached_fid, lease_break);
-
-	close_cached_dir_lease(cfid);
-}
-
-/*
- * Open the and cache a directory handle.
- * Only supported for the root handle.
- * If error then *cfid is not initialized.
- */
-int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
-		const char *path,
-		struct cifs_sb_info *cifs_sb,
-		struct cached_fid **cfid)
-{
-	struct cifs_ses *ses;
-	struct TCP_Server_Info *server;
-	struct cifs_open_parms oparms;
-	struct smb2_create_rsp *o_rsp = NULL;
-	struct smb2_query_info_rsp *qi_rsp = NULL;
-	int resp_buftype[2];
-	struct smb_rqst rqst[2];
-	struct kvec rsp_iov[2];
-	struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
-	struct kvec qi_iov[1];
-	int rc, flags = 0;
-	__le16 utf16_path = 0; /* Null - since an open of top of share */
-	u8 oplock = SMB2_OPLOCK_LEVEL_II;
-	struct cifs_fid *pfid;
-	struct dentry *dentry;
-
-	if (tcon == NULL || tcon->nohandlecache ||
-	    is_smb1_server(tcon->ses->server))
-		return -ENOTSUPP;
-
-	ses = tcon->ses;
-	server = ses->server;
-
-	if (cifs_sb->root == NULL)
-		return -ENOENT;
-
-	if (strlen(path))
-		return -ENOENT;
-
-	dentry = cifs_sb->root;
-
-	mutex_lock(&tcon->crfid.fid_mutex);
-	if (tcon->crfid.is_valid) {
-		cifs_dbg(FYI, "found a cached root file handle\n");
-		*cfid = &tcon->crfid;
-		kref_get(&tcon->crfid.refcount);
-		mutex_unlock(&tcon->crfid.fid_mutex);
-		return 0;
-	}
-
-	/*
-	 * We do not hold the lock for the open because in case
-	 * SMB2_open needs to reconnect, it will end up calling
-	 * cifs_mark_open_files_invalid() which takes the lock again
-	 * thus causing a deadlock
-	 */
-
-	mutex_unlock(&tcon->crfid.fid_mutex);
-
-	if (smb3_encryption_required(tcon))
-		flags |= CIFS_TRANSFORM_REQ;
-
-	if (!server->ops->new_lease_key)
-		return -EIO;
-
-	pfid = tcon->crfid.fid;
-	server->ops->new_lease_key(pfid);
-
-	memset(rqst, 0, sizeof(rqst));
-	resp_buftype[0] = resp_buftype[1] = CIFS_NO_BUFFER;
-	memset(rsp_iov, 0, sizeof(rsp_iov));
-
-	/* Open */
-	memset(&open_iov, 0, sizeof(open_iov));
-	rqst[0].rq_iov = open_iov;
-	rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
-
-	oparms.tcon = tcon;
-	oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_FILE);
-	oparms.desired_access = FILE_READ_ATTRIBUTES;
-	oparms.disposition = FILE_OPEN;
-	oparms.fid = pfid;
-	oparms.reconnect = false;
-
-	rc = SMB2_open_init(tcon, server,
-			    &rqst[0], &oplock, &oparms, &utf16_path);
-	if (rc)
-		goto oshr_free;
-	smb2_set_next_command(tcon, &rqst[0]);
-
-	memset(&qi_iov, 0, sizeof(qi_iov));
-	rqst[1].rq_iov = qi_iov;
-	rqst[1].rq_nvec = 1;
-
-	rc = SMB2_query_info_init(tcon, server,
-				  &rqst[1], COMPOUND_FID,
-				  COMPOUND_FID, FILE_ALL_INFORMATION,
-				  SMB2_O_INFO_FILE, 0,
-				  sizeof(struct smb2_file_all_info) +
-				  PATH_MAX * 2, 0, NULL);
-	if (rc)
-		goto oshr_free;
-
-	smb2_set_related(&rqst[1]);
-
-	rc = compound_send_recv(xid, ses, server,
-				flags, 2, rqst,
-				resp_buftype, rsp_iov);
-	mutex_lock(&tcon->crfid.fid_mutex);
-
-	/*
-	 * Now we need to check again as the cached root might have
-	 * been successfully re-opened from a concurrent process
-	 */
-
-	if (tcon->crfid.is_valid) {
-		/* work was already done */
-
-		/* stash fids for close() later */
-		struct cifs_fid fid = {
-			.persistent_fid = pfid->persistent_fid,
-			.volatile_fid = pfid->volatile_fid,
-		};
-
-		/*
-		 * caller expects this func to set the fid in crfid to valid
-		 * cached root, so increment the refcount.
-		 */
-		kref_get(&tcon->crfid.refcount);
-
-		mutex_unlock(&tcon->crfid.fid_mutex);
-
-		if (rc == 0) {
-			/* close extra handle outside of crit sec */
-			SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
-		}
-		rc = 0;
-		goto oshr_free;
-	}
-
-	/* Cached root is still invalid, continue normaly */
-
-	if (rc) {
-		if (rc == -EREMCHG) {
-			tcon->need_reconnect = true;
-			pr_warn_once("server share %s deleted\n",
-				     tcon->treeName);
-		}
-		goto oshr_exit;
-	}
-
-	atomic_inc(&tcon->num_remote_opens);
-
-	o_rsp = (struct smb2_create_rsp *)rsp_iov[0].iov_base;
-	oparms.fid->persistent_fid = o_rsp->PersistentFileId;
-	oparms.fid->volatile_fid = o_rsp->VolatileFileId;
-#ifdef CONFIG_CIFS_DEBUG2
-	oparms.fid->mid = le64_to_cpu(o_rsp->hdr.MessageId);
-#endif /* CIFS_DEBUG2 */
-
-	tcon->crfid.tcon = tcon;
-	tcon->crfid.is_valid = true;
-	tcon->crfid.dentry = dentry;
-	dget(dentry);
-	kref_init(&tcon->crfid.refcount);
-
-	/* BB TBD check to see if oplock level check can be removed below */
-	if (o_rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE) {
-		/*
-		 * See commit 2f94a3125b87. Increment the refcount when we
-		 * get a lease for root, release it if lease break occurs
-		 */
-		kref_get(&tcon->crfid.refcount);
-		tcon->crfid.has_lease = true;
-		smb2_parse_contexts(server, o_rsp,
-				&oparms.fid->epoch,
-				    oparms.fid->lease_key, &oplock,
-				    NULL, NULL);
-	} else
-		goto oshr_exit;
-
-	qi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
-	if (le32_to_cpu(qi_rsp->OutputBufferLength) < sizeof(struct smb2_file_all_info))
-		goto oshr_exit;
-	if (!smb2_validate_and_copy_iov(
-				le16_to_cpu(qi_rsp->OutputBufferOffset),
-				sizeof(struct smb2_file_all_info),
-				&rsp_iov[1], sizeof(struct smb2_file_all_info),
-				(char *)&tcon->crfid.file_all_info))
-		tcon->crfid.file_all_info_is_valid = true;
-	tcon->crfid.time = jiffies;
-
-
-oshr_exit:
-	mutex_unlock(&tcon->crfid.fid_mutex);
-oshr_free:
-	SMB2_open_free(&rqst[0]);
-	SMB2_query_info_free(&rqst[1]);
-	free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
-	free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
-	if (rc == 0)
-		*cfid = &tcon->crfid;
-	return rc;
-}
-
-int open_cached_dir_by_dentry(struct cifs_tcon *tcon,
-			      struct dentry *dentry,
-			      struct cached_fid **cfid)
-{
-	mutex_lock(&tcon->crfid.fid_mutex);
-	if (tcon->crfid.dentry == dentry) {
-		cifs_dbg(FYI, "found a cached root file handle by dentry\n");
-		*cfid = &tcon->crfid;
-		kref_get(&tcon->crfid.refcount);
-		mutex_unlock(&tcon->crfid.fid_mutex);
-		return 0;
-	}
-	mutex_unlock(&tcon->crfid.fid_mutex);
-	return -ENOENT;
-}
-
 static void
 smb3_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon,
 	      struct cifs_sb_info *cifs_sb)
@@ -1013,9 +720,9 @@ smb3_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon,
 	oparms.fid = &fid;
 	oparms.reconnect = false;
 
-	rc = open_cached_dir(xid, tcon, "", cifs_sb, &cfid);
+	rc = open_cached_dir(xid, tcon, "", cifs_sb, false, &cfid);
 	if (rc == 0)
-		memcpy(&fid, cfid->fid, sizeof(struct cifs_fid));
+		memcpy(&fid, &cfid->fid, sizeof(struct cifs_fid));
 	else
 		rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL,
 			       NULL, NULL);
@@ -1076,9 +783,16 @@ smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
 	__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 	struct cifs_open_parms oparms;
 	struct cifs_fid fid;
+	struct cached_fid *cfid;
 
-	if ((*full_path == 0) && tcon->crfid.is_valid)
-		return 0;
+	rc = open_cached_dir(xid, tcon, full_path, cifs_sb, true, &cfid);
+	if (!rc) {
+		if (cfid->is_valid) {
+			close_cached_dir(cfid);
+			return 0;
+		}
+		close_cached_dir(cfid);
+	}
 
 	utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
 	if (!utf16_path)
@@ -2723,8 +2437,12 @@ smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
 	resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
 	memset(rsp_iov, 0, sizeof(rsp_iov));
 
+	/*
+	 * We can only call this for things we know are directories.
+	 */
 	if (!strcmp(path, ""))
-		open_cached_dir(xid, tcon, path, cifs_sb, &cfid); /* cfid null if open dir failed */
+		open_cached_dir(xid, tcon, path, cifs_sb, false,
+				&cfid); /* cfid null if open dir failed */
 
 	memset(&open_iov, 0, sizeof(open_iov));
 	rqst[0].rq_iov = open_iov;
@@ -2750,8 +2468,8 @@ smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
 	if (cfid) {
 		rc = SMB2_query_info_init(tcon, server,
 					  &rqst[1],
-					  cfid->fid->persistent_fid,
-					  cfid->fid->volatile_fid,
+					  cfid->fid.persistent_fid,
+					  cfid->fid.volatile_fid,
 					  class, type, 0,
 					  output_len, 0,
 					  NULL);

fs/cifs/smb2pdu.c

@@ -39,6 +39,7 @@
 #ifdef CONFIG_CIFS_DFS_UPCALL
 #include "dfs_cache.h"
 #endif
+#include "cached_dir.h"
 
 /*
  *  The following table defines the expected "StructureSize" of SMB2 requests
@@ -1978,7 +1979,7 @@ SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 	}
 	spin_unlock(&ses->chan_lock);
 
-	close_cached_dir_lease(&tcon->crfid);
+	invalidate_all_cached_dirs(tcon);
 
 	rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, ses->server,
 				 (void **) &req,

fs/cifs/smb2proto.h

@@ -54,16 +54,6 @@ extern bool smb2_is_valid_oplock_break(char *buffer,
 extern int smb3_handle_read_data(struct TCP_Server_Info *server,
 				 struct mid_q_entry *mid);
 
-extern int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
-			   const char *path,
-			   struct cifs_sb_info *cifs_sb,
-			   struct cached_fid **cfid);
-extern int open_cached_dir_by_dentry(struct cifs_tcon *tcon,
-				     struct dentry *dentry,
-				     struct cached_fid **cfid);
-extern void close_cached_dir(struct cached_fid *cfid);
-extern void close_cached_dir_lease(struct cached_fid *cfid);
-extern void close_cached_dir_lease_locked(struct cached_fid *cfid);
 extern void move_smb2_info_to_cifs(FILE_ALL_INFO *dst,
 				   struct smb2_file_all_info *src);
 extern int smb2_query_reparse_tag(const unsigned int xid, struct cifs_tcon *tcon,