1 files changed, 0 insertions, 558 deletions

diff --git a/fs/cifs/cached_dir.c b/fs/cifs/cached_dir.c
deleted file mode 100644
index 60399081046a..000000000000
--- a/fs/cifs/cached_dir.c
+++ /dev/null
@@ -1,558 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- *  Functions to handle the cached directory entries
- *
- *  Copyright (c) 2022, Ronnie Sahlberg <lsahlber@redhat.com>
- */
-
-#include <linux/namei.h>
-#include "cifsglob.h"
-#include "cifsproto.h"
-#include "cifs_debug.h"
-#include "smb2proto.h"
-#include "cached_dir.h"
-
-static struct cached_fid *init_cached_dir(const char *path);
-static void free_cached_dir(struct cached_fid *cfid);
-
-static struct cached_fid *find_or_create_cached_dir(struct cached_fids *cfids,
-						    const char *path,
-						    bool lookup_only)
-{
-	struct cached_fid *cfid;
-
-	spin_lock(&cfids->cfid_list_lock);
-	list_for_each_entry(cfid, &cfids->entries, entry) {
-		if (!strcmp(cfid->path, path)) {
-			/*
-			 * If it doesn't have a lease it is either not yet
-			 * fully cached or it may be in the process of
-			 * being deleted due to a lease break.
-			 */
-			if (!cfid->has_lease) {
-				spin_unlock(&cfids->cfid_list_lock);
-				return NULL;
-			}
-			kref_get(&cfid->refcount);
-			spin_unlock(&cfids->cfid_list_lock);
-			return cfid;
-		}
-	}
-	if (lookup_only) {
-		spin_unlock(&cfids->cfid_list_lock);
-		return NULL;
-	}
-	if (cfids->num_entries >= MAX_CACHED_FIDS) {
-		spin_unlock(&cfids->cfid_list_lock);
-		return NULL;
-	}
-	cfid = init_cached_dir(path);
-	if (cfid == NULL) {
-		spin_unlock(&cfids->cfid_list_lock);
-		return NULL;
-	}
-	cfid->cfids = cfids;
-	cfids->num_entries++;
-	list_add(&cfid->entry, &cfids->entries);
-	cfid->on_list = true;
-	kref_get(&cfid->refcount);
-	spin_unlock(&cfids->cfid_list_lock);
-	return cfid;
-}
-
-static struct dentry *
-path_to_dentry(struct cifs_sb_info *cifs_sb, const char *path)
-{
-	struct dentry *dentry;
-	const char *s, *p;
-	char sep;
-
-	sep = CIFS_DIR_SEP(cifs_sb);
-	dentry = dget(cifs_sb->root);
-	s = path;
-
-	do {
-		struct inode *dir = d_inode(dentry);
-		struct dentry *child;
-
-		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_positive_unlocked(p, dentry, s - p);
-		dput(dentry);
-		dentry = child;
-	} while (!IS_ERR(dentry));
-	return dentry;
-}
-
-/*
- * 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 = NULL;
-	u8 oplock = SMB2_OPLOCK_LEVEL_II;
-	struct cifs_fid *pfid;
-	struct dentry *dentry = NULL;
-	struct cached_fid *cfid;
-	struct cached_fids *cfids;
-
-	if (tcon == NULL || tcon->cfids == NULL || tcon->nohandlecache ||
-	    is_smb1_server(tcon->ses->server))
-		return -EOPNOTSUPP;
-
-	ses = tcon->ses;
-	server = ses->server;
-	cfids = tcon->cfids;
-
-	if (!server->ops->new_lease_key)
-		return -EIO;
-
-	if (cifs_sb->root == NULL)
-		return -ENOENT;
-
-	utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
-	if (!utf16_path)
-		return -ENOMEM;
-
-	cfid = find_or_create_cached_dir(cfids, path, lookup_only);
-	if (cfid == NULL) {
-		kfree(utf16_path);
-		return -ENOENT;
-	}
-	/*
-	 * At this point we either have a lease already and we can just
-	 * return it. If not we are guaranteed to be the only thread accessing
-	 * this cfid.
-	 */
-	if (cfid->has_lease) {
-		*ret_cfid = cfid;
-		kfree(utf16_path);
-		return 0;
-	}
-
-	/*
-	 * We do not hold the lock for the open because in case
-	 * SMB2_open needs to reconnect.
-	 * This is safe because no other thread will be able to get a ref
-	 * to the cfid until we have finished opening the file and (possibly)
-	 * acquired a lease.
-	 */
-	if (smb3_encryption_required(tcon))
-		flags |= CIFS_TRANSFORM_REQ;
-
-	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);
-	if (rc) {
-		if (rc == -EREMCHG) {
-			tcon->need_reconnect = true;
-			pr_warn_once("server share %s deleted\n",
-				     tcon->tree_name);
-		}
-		goto oshr_free;
-	}
-
-	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 */
-
-	if (o_rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
-		goto oshr_free;
-
-
-	smb2_parse_contexts(server, o_rsp,
-			    &oparms.fid->epoch,
-			    oparms.fid->lease_key, &oplock,
-			    NULL, NULL);
-
-	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_free;
-	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;
-
-	if (!path[0])
-		dentry = dget(cifs_sb->root);
-	else {
-		dentry = path_to_dentry(cifs_sb, path);
-		if (IS_ERR(dentry)) {
-			rc = -ENOENT;
-			goto oshr_free;
-		}
-	}
-	cfid->dentry = dentry;
-	cfid->tcon = tcon;
-	cfid->time = jiffies;
-	cfid->is_open = true;
-	cfid->has_lease = true;
-
-oshr_free:
-	kfree(utf16_path);
-	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);
-	spin_lock(&cfids->cfid_list_lock);
-	if (!cfid->has_lease) {
-		if (cfid->on_list) {
-			list_del(&cfid->entry);
-			cfid->on_list = false;
-			cfids->num_entries--;
-		}
-		rc = -ENOENT;
-	}
-	spin_unlock(&cfids->cfid_list_lock);
-	if (rc) {
-		free_cached_dir(cfid);
-		cfid = NULL;
-	}
-
-	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;
-	struct cached_fids *cfids = tcon->cfids;
-
-	if (cfids == NULL)
-		return -ENOENT;
-
-	spin_lock(&cfids->cfid_list_lock);
-	list_for_each_entry(cfid, &cfids->entries, entry) {
-		if (dentry && cfid->dentry == dentry) {
-			cifs_dbg(FYI, "found a cached root file handle by dentry\n");
-			kref_get(&cfid->refcount);
-			*ret_cfid = cfid;
-			spin_unlock(&cfids->cfid_list_lock);
-			return 0;
-		}
-	}
-	spin_unlock(&cfids->cfid_list_lock);
-	return -ENOENT;
-}
-
-static void
-smb2_close_cached_fid(struct kref *ref)
-{
-	struct cached_fid *cfid = container_of(ref, struct cached_fid,
-					       refcount);
-
-	spin_lock(&cfid->cfids->cfid_list_lock);
-	if (cfid->on_list) {
-		list_del(&cfid->entry);
-		cfid->on_list = false;
-		cfid->cfids->num_entries--;
-	}
-	spin_unlock(&cfid->cfids->cfid_list_lock);
-
-	dput(cfid->dentry);
-	cfid->dentry = NULL;
-
-	if (cfid->is_open) {
-		SMB2_close(0, cfid->tcon, cfid->fid.persistent_fid,
-			   cfid->fid.volatile_fid);
-	}
-
-	free_cached_dir(cfid);
-}
-
-void drop_cached_dir_by_name(const unsigned int xid, struct cifs_tcon *tcon,
-			     const char *name, struct cifs_sb_info *cifs_sb)
-{
-	struct cached_fid *cfid = NULL;
-	int rc;
-
-	rc = open_cached_dir(xid, tcon, name, cifs_sb, true, &cfid);
-	if (rc) {
-		cifs_dbg(FYI, "no cached dir found for rmdir(%s)\n", name);
-		return;
-	}
-	spin_lock(&cfid->cfids->cfid_list_lock);
-	if (cfid->has_lease) {
-		cfid->has_lease = false;
-		kref_put(&cfid->refcount, smb2_close_cached_fid);
-	}
-	spin_unlock(&cfid->cfids->cfid_list_lock);
-	close_cached_dir(cfid);
-}
-
-
-void close_cached_dir(struct cached_fid *cfid)
-{
-	kref_put(&cfid->refcount, smb2_close_cached_fid);
-}
-
-/*
- * 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;
-	struct cached_fids *cfids;
-
-	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;
-		cfids = tcon->cfids;
-		if (cfids == NULL)
-			continue;
-		list_for_each_entry(cfid, &cfids->entries, entry) {
-			dput(cfid->dentry);
-			cfid->dentry = NULL;
-		}
-	}
-}
-
-/*
- * Invalidate all cached dirs when a TCON has been reset
- * due to a session loss.
- */
-void invalidate_all_cached_dirs(struct cifs_tcon *tcon)
-{
-	struct cached_fids *cfids = tcon->cfids;
-	struct cached_fid *cfid, *q;
-	LIST_HEAD(entry);
-
-	spin_lock(&cfids->cfid_list_lock);
-	list_for_each_entry_safe(cfid, q, &cfids->entries, entry) {
-		list_move(&cfid->entry, &entry);
-		cfids->num_entries--;
-		cfid->is_open = false;
-		cfid->on_list = false;
-		/* To prevent race with smb2_cached_lease_break() */
-		kref_get(&cfid->refcount);
-	}
-	spin_unlock(&cfids->cfid_list_lock);
-
-	list_for_each_entry_safe(cfid, q, &entry, entry) {
-		list_del(&cfid->entry);
-		cancel_work_sync(&cfid->lease_break);
-		if (cfid->has_lease) {
-			/*
-			 * We lease was never cancelled from the server so we
-			 * need to drop the reference.
-			 */
-			spin_lock(&cfids->cfid_list_lock);
-			cfid->has_lease = false;
-			spin_unlock(&cfids->cfid_list_lock);
-			kref_put(&cfid->refcount, smb2_close_cached_fid);
-		}
-		/* Drop the extra reference opened above*/
-		kref_put(&cfid->refcount, smb2_close_cached_fid);
-	}
-}
-
-static void
-smb2_cached_lease_break(struct work_struct *work)
-{
-	struct cached_fid *cfid = container_of(work,
-				struct cached_fid, lease_break);
-
-	spin_lock(&cfid->cfids->cfid_list_lock);
-	cfid->has_lease = false;
-	spin_unlock(&cfid->cfids->cfid_list_lock);
-	kref_put(&cfid->refcount, smb2_close_cached_fid);
-}
-
-int cached_dir_lease_break(struct cifs_tcon *tcon, __u8 lease_key[16])
-{
-	struct cached_fids *cfids = tcon->cfids;
-	struct cached_fid *cfid;
-
-	if (cfids == NULL)
-		return false;
-
-	spin_lock(&cfids->cfid_list_lock);
-	list_for_each_entry(cfid, &cfids->entries, entry) {
-		if (cfid->has_lease &&
-		    !memcmp(lease_key,
-			    cfid->fid.lease_key,
-			    SMB2_LEASE_KEY_SIZE)) {
-			cfid->time = 0;
-			/*
-			 * We found a lease remove it from the list
-			 * so no threads can access it.
-			 */
-			list_del(&cfid->entry);
-			cfid->on_list = false;
-			cfids->num_entries--;
-
-			queue_work(cifsiod_wq,
-				   &cfid->lease_break);
-			spin_unlock(&cfids->cfid_list_lock);
-			return true;
-		}
-	}
-	spin_unlock(&cfids->cfid_list_lock);
-	return false;
-}
-
-static struct cached_fid *init_cached_dir(const char *path)
-{
-	struct cached_fid *cfid;
-
-	cfid = kzalloc(sizeof(*cfid), GFP_ATOMIC);
-	if (!cfid)
-		return NULL;
-	cfid->path = kstrdup(path, GFP_ATOMIC);
-	if (!cfid->path) {
-		kfree(cfid);
-		return NULL;
-	}
-
-	INIT_WORK(&cfid->lease_break, smb2_cached_lease_break);
-	INIT_LIST_HEAD(&cfid->entry);
-	INIT_LIST_HEAD(&cfid->dirents.entries);
-	mutex_init(&cfid->dirents.de_mutex);
-	spin_lock_init(&cfid->fid_lock);
-	kref_init(&cfid->refcount);
-	return cfid;
-}
-
-static void free_cached_dir(struct cached_fid *cfid)
-{
-	struct cached_dirent *dirent, *q;
-
-	dput(cfid->dentry);
-	cfid->dentry = NULL;
-
-	/*
-	 * Delete all cached dirent names
-	 */
-	list_for_each_entry_safe(dirent, q, &cfid->dirents.entries, entry) {
-		list_del(&dirent->entry);
-		kfree(dirent->name);
-		kfree(dirent);
-	}
-
-	kfree(cfid->path);
-	cfid->path = NULL;
-	kfree(cfid);
-}
-
-struct cached_fids *init_cached_dirs(void)
-{
-	struct cached_fids *cfids;
-
-	cfids = kzalloc(sizeof(*cfids), GFP_KERNEL);
-	if (!cfids)
-		return NULL;
-	spin_lock_init(&cfids->cfid_list_lock);
-	INIT_LIST_HEAD(&cfids->entries);
-	return cfids;
-}
-
-/*
- * Called from tconInfoFree when we are tearing down the tcon.
- * There are no active users or open files/directories at this point.
- */
-void free_cached_dirs(struct cached_fids *cfids)
-{
-	struct cached_fid *cfid, *q;
-	LIST_HEAD(entry);
-
-	spin_lock(&cfids->cfid_list_lock);
-	list_for_each_entry_safe(cfid, q, &cfids->entries, entry) {
-		cfid->on_list = false;
-		cfid->is_open = false;
-		list_move(&cfid->entry, &entry);
-	}
-	spin_unlock(&cfids->cfid_list_lock);
-
-	list_for_each_entry_safe(cfid, q, &entry, entry) {
-		list_del(&cfid->entry);
-		free_cached_dir(cfid);
-	}
-
-	kfree(cfids);
-}