CIFS: Request SMB2.1 leases
if server supports them and we need oplocks.
Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 4cd68c7..28ac048 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -36,6 +36,7 @@
#include <linux/kthread.h>
#include <linux/freezer.h>
#include <linux/namei.h>
+#include <linux/random.h>
#include <net/ipv6.h>
#include "cifsfs.h"
#include "cifspdu.h"
@@ -88,6 +89,10 @@
struct workqueue_struct *cifsiod_wq;
+#ifdef CONFIG_CIFS_SMB2
+__u8 cifs_client_guid[SMB2_CLIENT_GUID_SIZE];
+#endif
+
static int
cifs_read_super(struct super_block *sb)
{
@@ -218,9 +223,10 @@
return NULL;
cifs_inode->cifsAttrs = 0x20; /* default */
cifs_inode->time = 0;
- /* Until the file is open and we have gotten oplock
- info back from the server, can not assume caching of
- file data or metadata */
+ /*
+ * Until the file is open and we have gotten oplock info back from the
+ * server, can not assume caching of file data or metadata.
+ */
cifs_set_oplock_level(cifs_inode, 0);
cifs_inode->delete_pending = false;
cifs_inode->invalid_mapping = false;
@@ -228,10 +234,14 @@
cifs_inode->server_eof = 0;
cifs_inode->uniqueid = 0;
cifs_inode->createtime = 0;
-
- /* Can not set i_flags here - they get immediately overwritten
- to zero by the VFS */
-/* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
+#ifdef CONFIG_CIFS_SMB2
+ get_random_bytes(cifs_inode->lease_key, SMB2_LEASE_KEY_SIZE);
+#endif
+ /*
+ * Can not set i_flags here - they get immediately overwritten to zero
+ * by the VFS.
+ */
+ /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
INIT_LIST_HEAD(&cifs_inode->openFileList);
INIT_LIST_HEAD(&cifs_inode->llist);
return &cifs_inode->vfs_inode;
@@ -1107,6 +1117,10 @@
spin_lock_init(&cifs_file_list_lock);
spin_lock_init(&GlobalMid_Lock);
+#ifdef CONFIG_CIFS_SMB2
+ get_random_bytes(cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
+#endif
+
if (cifs_max_pending < 2) {
cifs_max_pending = 2;
cFYI(1, "cifs_max_pending set to min of 2");
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index e2492e1..b6ec142 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -361,6 +361,12 @@
const unsigned int);
/* push brlocks from the cache to the server */
int (*push_mand_locks)(struct cifsFileInfo *);
+ /* get lease key of the inode */
+ void (*get_lease_key)(struct inode *, struct cifs_fid *fid);
+ /* set lease key of the inode */
+ void (*set_lease_key)(struct inode *, struct cifs_fid *fid);
+ /* generate new lease key */
+ void (*new_lease_key)(struct cifs_fid *fid);
};
struct smb_version_values {
@@ -895,6 +901,7 @@
#ifdef CONFIG_CIFS_SMB2
__u64 persistent_fid; /* persist file id for smb2 */
__u64 volatile_fid; /* volatile file id for smb2 */
+ __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for smb2 */
#endif
};
@@ -1012,6 +1019,9 @@
u64 server_eof; /* current file size on server -- protected by i_lock */
u64 uniqueid; /* server inode number */
u64 createtime; /* creation time on server */
+#ifdef CONFIG_CIFS_SMB2
+ __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for this inode */
+#endif
#ifdef CONFIG_CIFS_FSCACHE
struct fscache_cookie *fscache;
#endif
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index b99a167..4f2147c 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -340,6 +340,8 @@
rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
xid, &fid->netfid);
if (newinode) {
+ if (server->ops->set_lease_key)
+ server->ops->set_lease_key(newinode, fid);
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
newinode->i_mode = mode;
if ((*oplock & CIFS_CREATE_ACTION) &&
@@ -418,6 +420,9 @@
tcon = tlink_tcon(tlink);
server = tcon->ses->server;
+ if (server->ops->new_lease_key)
+ server->ops->new_lease_key(&fid);
+
rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
&oplock, &fid, opened);
@@ -473,10 +478,14 @@
if (IS_ERR(tlink))
goto out_free_xid;
- rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
- &oplock, &fid, &created);
tcon = tlink_tcon(tlink);
server = tcon->ses->server;
+
+ if (server->ops->new_lease_key)
+ server->ops->new_lease_key(&fid);
+
+ rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
+ &oplock, &fid, &created);
if (!rc && server->ops->close)
server->ops->close(xid, tcon, &fid);
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 2e2e4f9..ccad858 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -177,8 +177,9 @@
int disposition;
int create_options = CREATE_NOT_DIR;
FILE_ALL_INFO *buf;
+ struct TCP_Server_Info *server = tcon->ses->server;
- if (!tcon->ses->server->ops->open)
+ if (!server->ops->open)
return -ENOSYS;
desired_access = cifs_convert_flags(f_flags);
@@ -218,9 +219,9 @@
if (backup_cred(cifs_sb))
create_options |= CREATE_OPEN_BACKUP_INTENT;
- rc = tcon->ses->server->ops->open(xid, tcon, full_path, disposition,
- desired_access, create_options, fid,
- oplock, buf, cifs_sb);
+ rc = server->ops->open(xid, tcon, full_path, disposition,
+ desired_access, create_options, fid, oplock, buf,
+ cifs_sb);
if (rc)
goto out;
@@ -372,6 +373,7 @@
unsigned int xid;
__u32 oplock;
struct cifs_sb_info *cifs_sb;
+ struct TCP_Server_Info *server;
struct cifs_tcon *tcon;
struct tcon_link *tlink;
struct cifsFileInfo *cfile = NULL;
@@ -388,6 +390,7 @@
return PTR_ERR(tlink);
}
tcon = tlink_tcon(tlink);
+ server = tcon->ses->server;
full_path = build_path_from_dentry(file->f_path.dentry);
if (full_path == NULL) {
@@ -432,6 +435,9 @@
}
if (!posix_open_ok) {
+ if (server->ops->get_lease_key)
+ server->ops->get_lease_key(inode, &fid);
+
rc = cifs_nt_open(full_path, inode, cifs_sb, tcon,
file->f_flags, &oplock, &fid, xid);
if (rc)
@@ -440,8 +446,8 @@
cfile = cifs_new_fileinfo(&fid, file, tlink, oplock);
if (cfile == NULL) {
- if (tcon->ses->server->ops->close)
- tcon->ses->server->ops->close(xid, tcon, &fid);
+ if (server->ops->close)
+ server->ops->close(xid, tcon, &fid);
rc = -ENOMEM;
goto out;
}
@@ -567,6 +573,9 @@
if (backup_cred(cifs_sb))
create_options |= CREATE_OPEN_BACKUP_INTENT;
+ if (server->ops->get_lease_key)
+ server->ops->get_lease_key(inode, &fid);
+
/*
* Can not refresh inode by passing in file_info buf to be returned by
* CIFSSMBOpen and then calling get_inode_info with returned buf since
diff --git a/fs/cifs/smb2file.c b/fs/cifs/smb2file.c
index 0ddd617..78fb205 100644
--- a/fs/cifs/smb2file.c
+++ b/fs/cifs/smb2file.c
@@ -63,6 +63,7 @@
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) {
@@ -78,11 +79,14 @@
}
desired_access |= FILE_READ_ATTRIBUTES;
- *oplock = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
+ *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, (__u8 *)oplock, smb2_data);
+ 0, 0, smb2_oplock, smb2_data);
if (rc)
goto out;
@@ -99,6 +103,7 @@
move_smb2_info_to_cifs(buf, smb2_data);
}
+ *oplock = *smb2_oplock;
out:
kfree(smb2_data);
kfree(smb2_path);
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 0808b23..360d907 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -555,6 +555,24 @@
current->tgid, length, offset, type, wait);
}
+static void
+smb2_get_lease_key(struct inode *inode, struct cifs_fid *fid)
+{
+ memcpy(fid->lease_key, CIFS_I(inode)->lease_key, SMB2_LEASE_KEY_SIZE);
+}
+
+static void
+smb2_set_lease_key(struct inode *inode, struct cifs_fid *fid)
+{
+ memcpy(CIFS_I(inode)->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
+}
+
+static void
+smb2_new_lease_key(struct cifs_fid *fid)
+{
+ get_random_bytes(fid->lease_key, SMB2_LEASE_KEY_SIZE);
+}
+
struct smb_version_operations smb21_operations = {
.compare_fids = smb2_compare_fids,
.setup_request = smb2_setup_request,
@@ -616,6 +634,9 @@
.mand_lock = smb2_mand_lock,
.mand_unlock_range = smb2_unlock_range,
.push_mand_locks = smb2_push_mandatory_locks,
+ .get_lease_key = smb2_get_lease_key,
+ .set_lease_key = smb2_set_lease_key,
+ .new_lease_key = smb2_new_lease_key,
};
struct smb_version_values smb21_values = {
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index d3e1cfc..89d2824 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -304,7 +304,7 @@
cifs_buf_release(rsp);
}
-#define SMB2_NUM_PROT 1
+#define SMB2_NUM_PROT 2
#define SMB2_PROT 0
#define SMB21_PROT 1
@@ -393,6 +393,8 @@
req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
+ memcpy(req->ClientGUID, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
+
iov[0].iov_base = (char *)req;
/* 4 for rfc1002 length field */
iov[0].iov_len = get_rfc1002_length(req) + 4;
@@ -868,6 +870,83 @@
return rc;
}
+static struct create_lease *
+create_lease_buf(u8 *lease_key, u8 oplock)
+{
+ struct create_lease *buf;
+
+ buf = kmalloc(sizeof(struct create_lease), GFP_KERNEL);
+ if (!buf)
+ return NULL;
+
+ memset(buf, 0, sizeof(struct create_lease));
+
+ buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
+ buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
+ if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
+ buf->lcontext.LeaseState = SMB2_LEASE_WRITE_CACHING |
+ SMB2_LEASE_READ_CACHING;
+ else if (oplock == SMB2_OPLOCK_LEVEL_II)
+ buf->lcontext.LeaseState = SMB2_LEASE_READ_CACHING;
+ else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
+ buf->lcontext.LeaseState = SMB2_LEASE_HANDLE_CACHING |
+ SMB2_LEASE_READ_CACHING |
+ SMB2_LEASE_WRITE_CACHING;
+
+ buf->ccontext.DataOffset = cpu_to_le16(offsetof
+ (struct create_lease, lcontext));
+ buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
+ buf->ccontext.NameOffset = cpu_to_le16(offsetof
+ (struct create_lease, Name));
+ buf->ccontext.NameLength = cpu_to_le16(4);
+ buf->Name[0] = 'R';
+ buf->Name[1] = 'q';
+ buf->Name[2] = 'L';
+ buf->Name[3] = 's';
+ return buf;
+}
+
+static __u8
+parse_lease_state(struct smb2_create_rsp *rsp)
+{
+ char *data_offset;
+ struct create_lease *lc;
+ __u8 oplock = 0;
+ bool found = false;
+
+ data_offset = (char *)rsp;
+ data_offset += 4 + le32_to_cpu(rsp->CreateContextsOffset);
+ lc = (struct create_lease *)data_offset;
+ do {
+ char *name = le16_to_cpu(lc->ccontext.NameOffset) + (char *)lc;
+ if (le16_to_cpu(lc->ccontext.NameLength) != 4 ||
+ strncmp(name, "RqLs", 4)) {
+ lc = (struct create_lease *)((char *)lc
+ + le32_to_cpu(lc->ccontext.Next));
+ continue;
+ }
+ if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
+ return SMB2_OPLOCK_LEVEL_NOCHANGE;
+ found = true;
+ break;
+ } while (le32_to_cpu(lc->ccontext.Next) != 0);
+
+ if (!found)
+ return oplock;
+
+ if (le32_to_cpu(lc->lcontext.LeaseState) & SMB2_LEASE_WRITE_CACHING) {
+ if (le32_to_cpu(lc->lcontext.LeaseState) &
+ SMB2_LEASE_HANDLE_CACHING)
+ oplock = SMB2_OPLOCK_LEVEL_BATCH;
+ else
+ oplock = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
+ } else if (le32_to_cpu(lc->lcontext.LeaseState) &
+ SMB2_LEASE_READ_CACHING)
+ oplock = SMB2_OPLOCK_LEVEL_II;
+
+ return oplock;
+}
+
int
SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
u64 *persistent_fid, u64 *volatile_fid, __u32 desired_access,
@@ -878,9 +957,11 @@
struct smb2_create_rsp *rsp;
struct TCP_Server_Info *server;
struct cifs_ses *ses = tcon->ses;
- struct kvec iov[2];
+ struct kvec iov[3];
int resp_buftype;
int uni_path_len;
+ __le16 *copy_path = NULL;
+ int copy_size;
int rc = 0;
int num_iovecs = 2;
@@ -895,10 +976,6 @@
if (rc)
return rc;
- if (server->oplocks)
- req->RequestedOplockLevel = *oplock;
- else
- req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
req->ImpersonationLevel = IL_IMPERSONATION;
req->DesiredAccess = cpu_to_le32(desired_access);
/* File attributes ignored on open (used in create though) */
@@ -908,7 +985,7 @@
req->CreateOptions = cpu_to_le32(create_options);
uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)
- - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
+ - 8 /* pad */ - 4 /* do not count rfc1001 len field */);
iov[0].iov_base = (char *)req;
/* 4 for rfc1002 length field */
@@ -919,6 +996,20 @@
req->NameLength = cpu_to_le16(uni_path_len - 2);
/* -1 since last byte is buf[0] which is sent below (path) */
iov[0].iov_len--;
+ if (uni_path_len % 8 != 0) {
+ copy_size = uni_path_len / 8 * 8;
+ if (copy_size < uni_path_len)
+ copy_size += 8;
+
+ copy_path = kzalloc(copy_size, GFP_KERNEL);
+ if (!copy_path)
+ return -ENOMEM;
+ memcpy((char *)copy_path, (const char *)path,
+ uni_path_len);
+ uni_path_len = copy_size;
+ path = copy_path;
+ }
+
iov[1].iov_len = uni_path_len;
iov[1].iov_base = path;
/*
@@ -927,10 +1018,37 @@
*/
inc_rfc1001_len(req, uni_path_len - 1);
} else {
+ iov[0].iov_len += 7;
+ req->hdr.smb2_buf_length = cpu_to_be32(be32_to_cpu(
+ req->hdr.smb2_buf_length) + 8 - 1);
num_iovecs = 1;
req->NameLength = 0;
}
+ if (!server->oplocks)
+ *oplock = SMB2_OPLOCK_LEVEL_NONE;
+
+ if (!(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
+ *oplock == SMB2_OPLOCK_LEVEL_NONE)
+ req->RequestedOplockLevel = *oplock;
+ else {
+ iov[num_iovecs].iov_base = create_lease_buf(oplock+1, *oplock);
+ if (iov[num_iovecs].iov_base == NULL) {
+ cifs_small_buf_release(req);
+ kfree(copy_path);
+ return -ENOMEM;
+ }
+ iov[num_iovecs].iov_len = sizeof(struct create_lease);
+ req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
+ req->CreateContextsOffset = cpu_to_le32(
+ sizeof(struct smb2_create_req) - 4 - 8 +
+ iov[num_iovecs-1].iov_len);
+ req->CreateContextsLength = cpu_to_le32(
+ sizeof(struct create_lease));
+ inc_rfc1001_len(&req->hdr, sizeof(struct create_lease));
+ num_iovecs++;
+ }
+
rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
rsp = (struct smb2_create_rsp *)iov[0].iov_base;
@@ -955,8 +1073,12 @@
buf->DeletePending = 0;
}
- *oplock = rsp->OplockLevel;
+ if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
+ *oplock = parse_lease_state(rsp);
+ else
+ *oplock = rsp->OplockLevel;
creat_exit:
+ kfree(copy_path);
free_rsp_buf(resp_buftype, rsp);
return rc;
}
diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index 889ee5e..e818a5c 100644
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -150,6 +150,10 @@
__u8 ErrorData[1]; /* variable length */
} __packed;
+#define SMB2_CLIENT_GUID_SIZE 16
+
+extern __u8 cifs_client_guid[SMB2_CLIENT_GUID_SIZE];
+
struct smb2_negotiate_req {
struct smb2_hdr hdr;
__le16 StructureSize; /* Must be 36 */
@@ -157,7 +161,7 @@
__le16 SecurityMode;
__le16 Reserved; /* MBZ */
__le32 Capabilities;
- __u8 ClientGUID[16]; /* MBZ */
+ __u8 ClientGUID[SMB2_CLIENT_GUID_SIZE];
__le64 ClientStartTime; /* MBZ */
__le16 Dialects[2]; /* variable length */
} __packed;
@@ -307,6 +311,8 @@
#define SMB2_OPLOCK_LEVEL_EXCLUSIVE 0x08
#define SMB2_OPLOCK_LEVEL_BATCH 0x09
#define SMB2_OPLOCK_LEVEL_LEASE 0xFF
+/* Non-spec internal type */
+#define SMB2_OPLOCK_LEVEL_NOCHANGE 0x99
/* Desired Access Flags */
#define FILE_READ_DATA_LE cpu_to_le32(0x00000001)
@@ -404,7 +410,7 @@
__le16 NameLength;
__le32 CreateContextsOffset;
__le32 CreateContextsLength;
- __u8 Buffer[1];
+ __u8 Buffer[8];
} __packed;
struct smb2_create_rsp {
@@ -428,6 +434,39 @@
__u8 Buffer[1];
} __packed;
+struct create_context {
+ __le32 Next;
+ __le16 NameOffset;
+ __le16 NameLength;
+ __le16 Reserved;
+ __le16 DataOffset;
+ __le32 DataLength;
+ __u8 Buffer[0];
+} __packed;
+
+#define SMB2_LEASE_NONE __constant_cpu_to_le32(0x00)
+#define SMB2_LEASE_READ_CACHING __constant_cpu_to_le32(0x01)
+#define SMB2_LEASE_HANDLE_CACHING __constant_cpu_to_le32(0x02)
+#define SMB2_LEASE_WRITE_CACHING __constant_cpu_to_le32(0x04)
+
+#define SMB2_LEASE_FLAG_BREAK_IN_PROGRESS __constant_cpu_to_le32(0x02)
+
+#define SMB2_LEASE_KEY_SIZE 16
+
+struct lease_context {
+ __le64 LeaseKeyLow;
+ __le64 LeaseKeyHigh;
+ __le32 LeaseState;
+ __le32 LeaseFlags;
+ __le64 LeaseDuration;
+} __packed;
+
+struct create_lease {
+ struct create_context ccontext;
+ __u8 Name[8];
+ struct lease_context lcontext;
+} __packed;
+
/* Currently defined values for close flags */
#define SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB cpu_to_le16(0x0001)
struct smb2_close_req {
