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cifs: Move cached-dir functions into a separate file

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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>
This commit is contained in:
Ronnie Sahlberg 2022-08-10 22:00:08 -05:00 committed by Steve French
parent cd04345598
commit 05b98fd2da
15 changed files with 411 additions and 351 deletions
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2
fs/cifs/Makefile
View File

@ -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 \

362
fs/cifs/cached_dir.c Normal file
View File

@ -0,0 +1,362 @@
// 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;
}

26
fs/cifs/cached_dir.h Normal file
View File

@ -0,0 +1,26 @@
/* 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 */

20
fs/cifs/cifsfs.c
View File

@ -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 @@ out_no_root:
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);

2
fs/cifs/cifsglob.h
View File

@ -1257,7 +1257,7 @@ 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 */

1
fs/cifs/cifsproto.h
View File

@ -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);

9
fs/cifs/file.c
View File

@ -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;

1
fs/cifs/inode.c
View File

@ -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)
{

12
fs/cifs/misc.c
View File

@ -116,13 +116,13 @@ 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.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;
@ -131,7 +131,7 @@ 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);
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);
@ -149,7 +149,7 @@ tconInfoFree(struct cifs_tcon *buf_to_free)
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);
}

1
fs/cifs/readdir.c
View File

@ -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

5
fs/cifs/smb2inode.c
View File

@ -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)
@ -518,9 +519,9 @@ smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
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,

11
fs/cifs/smb2misc.c
View File

@ -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;
}

297
fs/cifs/smb2ops.c
View File

@ -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 @@ out:
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)
@ -1077,7 +784,7 @@ smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
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);

3
fs/cifs/smb2pdu.c
View File

@ -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);
close_cached_dir_lease(&tcon->cfid);
rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, ses->server,
(void **) &req,

10
fs/cifs/smb2proto.h
View File

@ -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,