Also rename crfid to cfid to have consistent naming for this variable.
This commit does not change any logic.
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
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 \
--- /dev/null
+// 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,
+ 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 -EOPNOTSUPP;
+
+ 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->cfid.fid_mutex);
+ if (tcon->cfid.is_valid) {
+ cifs_dbg(FYI, "found a cached root file handle\n");
+ *cfid = &tcon->cfid;
+ kref_get(&tcon->cfid.refcount);
+ mutex_unlock(&tcon->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(&tcon->cfid.fid_mutex);
+
+ if (smb3_encryption_required(tcon))
+ flags |= CIFS_TRANSFORM_REQ;
+
+ if (!server->ops->new_lease_key)
+ return -EIO;
+
+ pfid = tcon->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(&tcon->cfid.fid_mutex);
+
+ /*
+ * Now we need to check again as the cached root might have
+ * been successfully re-opened from a concurrent process
+ */
+
+ if (tcon->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(&tcon->cfid.refcount);
+
+ mutex_unlock(&tcon->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 */
+
+ tcon->cfid.tcon = tcon;
+ tcon->cfid.is_valid = true;
+ tcon->cfid.dentry = dentry;
+ dget(dentry);
+ kref_init(&tcon->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(&tcon->cfid.refcount);
+ tcon->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 *)&tcon->cfid.file_all_info))
+ tcon->cfid.file_all_info_is_valid = true;
+ tcon->cfid.time = jiffies;
+
+
+oshr_exit:
+ mutex_unlock(&tcon->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)
+ *cfid = &tcon->cfid;
+
+ return rc;
+}
+
+int open_cached_dir_by_dentry(struct cifs_tcon *tcon,
+ struct dentry *dentry,
+ struct cached_fid **cfid)
+{
+ mutex_lock(&tcon->cfid.fid_mutex);
+ if (tcon->cfid.dentry == dentry) {
+ cifs_dbg(FYI, "found a cached root file handle by dentry\n");
+ *cfid = &tcon->cfid;
+ kref_get(&tcon->cfid.refcount);
+ mutex_unlock(&tcon->cfid.fid_mutex);
+ return 0;
+ }
+ mutex_unlock(&tcon->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;
+}
--- /dev/null
+/* 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
+
+
+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 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 */
#include "netlink.h"
#endif
#include "fs_context.h"
+#include "cached_dir.h"
/*
* DOS dates from 1980/1/1 through 2107/12/31
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);
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 */
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);
#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
}
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;
#include "fscache.h"
#include "fs_context.h"
#include "cifs_ioctl.h"
+#include "cached_dir.h"
static void cifs_set_ops(struct inode *inode)
{
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.fid = kzalloc(sizeof(*ret_buf->cfid.fid), GFP_KERNEL);
+ if (!ret_buf->cfid.fid) {
kfree(ret_buf);
return NULL;
}
- INIT_LIST_HEAD(&ret_buf->crfid.dirents.entries);
- mutex_init(&ret_buf->crfid.dirents.de_mutex);
+ INIT_LIST_HEAD(&ret_buf->cfid.dirents.entries);
+ mutex_init(&ret_buf->cfid.dirents.de_mutex);
atomic_inc(&tconInfoAllocCount);
ret_buf->status = TID_NEW;
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);
+ mutex_init(&ret_buf->cfid.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);
atomic_dec(&tconInfoAllocCount);
kfree(buf_to_free->nativeFileSystem);
kfree_sensitive(buf_to_free->password);
- kfree(buf_to_free->crfid.fid);
+ kfree(buf_to_free->cfid.fid);
kfree(buf_to_free);
}
#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
#include "smb2glob.h"
#include "smb2pdu.h"
#include "smb2proto.h"
+#include "cached_dir.h"
static void
free_set_inf_compound(struct smb_rqst *rqst)
rc = open_cached_dir(xid, tcon, full_path, cifs_sb, &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 (tcon->cfid.file_all_info_is_valid) {
move_smb2_info_to_cifs(data,
- &tcon->crfid.file_all_info);
+ &tcon->cfid.file_all_info);
} else {
rc = SMB2_query_info(xid, tcon,
cfid->fid->persistent_fid,
#include "smb2status.h"
#include "smb2glob.h"
#include "nterr.h"
+#include "cached_dir.h"
static int
check_smb2_hdr(struct smb2_hdr *shdr, __u64 mid)
}
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;
}
#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
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)
struct cifs_open_parms oparms;
struct cifs_fid fid;
- if ((*full_path == 0) && tcon->crfid.is_valid)
+ if ((*full_path == 0) && tcon->cfid.is_valid)
return 0;
utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
#ifdef CONFIG_CIFS_DFS_UPCALL
#include "dfs_cache.h"
#endif
+#include "cached_dir.h"
/*
* The following table defines the expected "StructureSize" of SMB2 requests
}
spin_unlock(&ses->chan_lock);
- close_cached_dir_lease(&tcon->crfid);
+ close_cached_dir_lease(&tcon->cfid);
rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, ses->server,
(void **) &req,
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,
projects / kernel.git / commitdiff