aboutsummaryrefslogtreecommitdiffstats
path: root/fs/cifs/smb2file.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/cifs/smb2file.c')
-rw-r--r--fs/cifs/smb2file.c302
1 files changed, 302 insertions, 0 deletions
diff --git a/fs/cifs/smb2file.c b/fs/cifs/smb2file.c
new file mode 100644
index 000000000000..a93eec30a50d
--- /dev/null
+++ b/fs/cifs/smb2file.c
@@ -0,0 +1,302 @@
+/*
+ * fs/cifs/smb2file.c
+ *
+ * Copyright (C) International Business Machines Corp., 2002, 2011
+ * Author(s): Steve French (sfrench@us.ibm.com),
+ * Pavel Shilovsky ((pshilovsky@samba.org) 2012
+ *
+ * This library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/slab.h>
+#include <linux/pagemap.h>
+#include <asm/div64.h>
+#include "cifsfs.h"
+#include "cifspdu.h"
+#include "cifsglob.h"
+#include "cifsproto.h"
+#include "cifs_debug.h"
+#include "cifs_fs_sb.h"
+#include "cifs_unicode.h"
+#include "fscache.h"
+#include "smb2proto.h"
+
+void
+smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
+{
+ oplock &= 0xFF;
+ if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
+ return;
+ if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
+ cinode->clientCanCacheAll = true;
+ cinode->clientCanCacheRead = true;
+ cFYI(1, "Exclusive Oplock granted on inode %p",
+ &cinode->vfs_inode);
+ } else if (oplock == SMB2_OPLOCK_LEVEL_II) {
+ cinode->clientCanCacheAll = false;
+ cinode->clientCanCacheRead = true;
+ cFYI(1, "Level II Oplock granted on inode %p",
+ &cinode->vfs_inode);
+ } else {
+ cinode->clientCanCacheAll = false;
+ cinode->clientCanCacheRead = false;
+ }
+}
+
+int
+smb2_open_file(const unsigned int xid, struct cifs_tcon *tcon, const char *path,
+ int disposition, int desired_access, int create_options,
+ struct cifs_fid *fid, __u32 *oplock, FILE_ALL_INFO *buf,
+ struct cifs_sb_info *cifs_sb)
+{
+ int rc;
+ __le16 *smb2_path;
+ struct smb2_file_all_info *smb2_data = NULL;
+ __u8 smb2_oplock[17];
+
+ smb2_path = cifs_convert_path_to_utf16(path, cifs_sb);
+ if (smb2_path == NULL) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
+ GFP_KERNEL);
+ if (smb2_data == NULL) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ desired_access |= FILE_READ_ATTRIBUTES;
+ *smb2_oplock = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
+
+ if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
+ memcpy(smb2_oplock + 1, fid->lease_key, SMB2_LEASE_KEY_SIZE);
+
+ rc = SMB2_open(xid, tcon, smb2_path, &fid->persistent_fid,
+ &fid->volatile_fid, desired_access, disposition,
+ 0, 0, smb2_oplock, smb2_data);
+ if (rc)
+ goto out;
+
+ if (buf) {
+ /* open response does not have IndexNumber field - get it */
+ rc = SMB2_get_srv_num(xid, tcon, fid->persistent_fid,
+ fid->volatile_fid,
+ &smb2_data->IndexNumber);
+ if (rc) {
+ /* let get_inode_info disable server inode numbers */
+ smb2_data->IndexNumber = 0;
+ rc = 0;
+ }
+ move_smb2_info_to_cifs(buf, smb2_data);
+ }
+
+ *oplock = *smb2_oplock;
+out:
+ kfree(smb2_data);
+ kfree(smb2_path);
+ return rc;
+}
+
+int
+smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
+ const unsigned int xid)
+{
+ int rc = 0, stored_rc;
+ unsigned int max_num, num = 0, max_buf;
+ struct smb2_lock_element *buf, *cur;
+ struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
+ struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
+ struct cifsLockInfo *li, *tmp;
+ __u64 length = 1 + flock->fl_end - flock->fl_start;
+ struct list_head tmp_llist;
+
+ INIT_LIST_HEAD(&tmp_llist);
+
+ /*
+ * Accessing maxBuf is racy with cifs_reconnect - need to store value
+ * and check it for zero before using.
+ */
+ max_buf = tcon->ses->server->maxBuf;
+ if (!max_buf)
+ return -EINVAL;
+
+ max_num = max_buf / sizeof(struct smb2_lock_element);
+ buf = kzalloc(max_num * sizeof(struct smb2_lock_element), GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ cur = buf;
+
+ down_write(&cinode->lock_sem);
+ list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
+ if (flock->fl_start > li->offset ||
+ (flock->fl_start + length) <
+ (li->offset + li->length))
+ continue;
+ if (current->tgid != li->pid)
+ continue;
+ if (cinode->can_cache_brlcks) {
+ /*
+ * We can cache brlock requests - simply remove a lock
+ * from the file's list.
+ */
+ list_del(&li->llist);
+ cifs_del_lock_waiters(li);
+ kfree(li);
+ continue;
+ }
+ cur->Length = cpu_to_le64(li->length);
+ cur->Offset = cpu_to_le64(li->offset);
+ cur->Flags = cpu_to_le32(SMB2_LOCKFLAG_UNLOCK);
+ /*
+ * We need to save a lock here to let us add it again to the
+ * file's list if the unlock range request fails on the server.
+ */
+ list_move(&li->llist, &tmp_llist);
+ if (++num == max_num) {
+ stored_rc = smb2_lockv(xid, tcon,
+ cfile->fid.persistent_fid,
+ cfile->fid.volatile_fid,
+ current->tgid, num, buf);
+ if (stored_rc) {
+ /*
+ * We failed on the unlock range request - add
+ * all locks from the tmp list to the head of
+ * the file's list.
+ */
+ cifs_move_llist(&tmp_llist,
+ &cfile->llist->locks);
+ rc = stored_rc;
+ } else
+ /*
+ * The unlock range request succeed - free the
+ * tmp list.
+ */
+ cifs_free_llist(&tmp_llist);
+ cur = buf;
+ num = 0;
+ } else
+ cur++;
+ }
+ if (num) {
+ stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid,
+ cfile->fid.volatile_fid, current->tgid,
+ num, buf);
+ if (stored_rc) {
+ cifs_move_llist(&tmp_llist, &cfile->llist->locks);
+ rc = stored_rc;
+ } else
+ cifs_free_llist(&tmp_llist);
+ }
+ up_write(&cinode->lock_sem);
+
+ kfree(buf);
+ return rc;
+}
+
+static int
+smb2_push_mand_fdlocks(struct cifs_fid_locks *fdlocks, const unsigned int xid,
+ struct smb2_lock_element *buf, unsigned int max_num)
+{
+ int rc = 0, stored_rc;
+ struct cifsFileInfo *cfile = fdlocks->cfile;
+ struct cifsLockInfo *li;
+ unsigned int num = 0;
+ struct smb2_lock_element *cur = buf;
+ struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
+
+ list_for_each_entry(li, &fdlocks->locks, llist) {
+ cur->Length = cpu_to_le64(li->length);
+ cur->Offset = cpu_to_le64(li->offset);
+ cur->Flags = cpu_to_le32(li->type |
+ SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
+ if (++num == max_num) {
+ stored_rc = smb2_lockv(xid, tcon,
+ cfile->fid.persistent_fid,
+ cfile->fid.volatile_fid,
+ current->tgid, num, buf);
+ if (stored_rc)
+ rc = stored_rc;
+ cur = buf;
+ num = 0;
+ } else
+ cur++;
+ }
+ if (num) {
+ stored_rc = smb2_lockv(xid, tcon,
+ cfile->fid.persistent_fid,
+ cfile->fid.volatile_fid,
+ current->tgid, num, buf);
+ if (stored_rc)
+ rc = stored_rc;
+ }
+
+ return rc;
+}
+
+int
+smb2_push_mandatory_locks(struct cifsFileInfo *cfile)
+{
+ int rc = 0, stored_rc;
+ unsigned int xid;
+ unsigned int max_num, max_buf;
+ struct smb2_lock_element *buf;
+ struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
+ struct cifs_fid_locks *fdlocks;
+
+ xid = get_xid();
+ /* we are going to update can_cache_brlcks here - need a write access */
+ down_write(&cinode->lock_sem);
+ if (!cinode->can_cache_brlcks) {
+ up_write(&cinode->lock_sem);
+ free_xid(xid);
+ return rc;
+ }
+
+ /*
+ * Accessing maxBuf is racy with cifs_reconnect - need to store value
+ * and check it for zero before using.
+ */
+ max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf;
+ if (!max_buf) {
+ up_write(&cinode->lock_sem);
+ free_xid(xid);
+ return -EINVAL;
+ }
+
+ max_num = max_buf / sizeof(struct smb2_lock_element);
+ buf = kzalloc(max_num * sizeof(struct smb2_lock_element), GFP_KERNEL);
+ if (!buf) {
+ up_write(&cinode->lock_sem);
+ free_xid(xid);
+ return -ENOMEM;
+ }
+
+ list_for_each_entry(fdlocks, &cinode->llist, llist) {
+ stored_rc = smb2_push_mand_fdlocks(fdlocks, xid, buf, max_num);
+ if (stored_rc)
+ rc = stored_rc;
+ }
+
+ cinode->can_cache_brlcks = false;
+ kfree(buf);
+
+ up_write(&cinode->lock_sem);
+ free_xid(xid);
+ return rc;
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.