if server supports them and we need oplocks.
Signed-off-by: Pavel Shilovsky <piastryyy@xxxxxxxxx>
---
fs/cifs/cifsfs.c | 20 +++++---
fs/cifs/cifsglob.h | 10 ++++
fs/cifs/dir.c | 5 ++
fs/cifs/file.c | 15 ++++--
fs/cifs/smb2file.c | 9 +++-
fs/cifs/smb2ops.c | 21 ++++++++
fs/cifs/smb2pdu.c | 142 +++++++++++++++++++++++++++++++++++++++++++++++----
fs/cifs/smb2pdu.h | 41 +++++++++++++++-
8 files changed, 237 insertions(+), 26 deletions(-)
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index e958d94..d86b755 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"
@@ -218,9 +219,10 @@ cifs_alloc_inode(struct super_block *sb)
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 +230,14 @@ cifs_alloc_inode(struct super_block *sb)
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;
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index efe3b84..3155080 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -361,6 +361,12 @@ struct smb_version_operations {
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 @@ struct cifs_fid {
#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 @@ struct cifsInodeInfo {
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..b633eb0 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -287,6 +287,9 @@ cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
if (backup_cred(cifs_sb))
create_options |= CREATE_OPEN_BACKUP_INTENT;
+ if (server->ops->new_lease_key)
+ server->ops->new_lease_key(fid);
+
rc = server->ops->open(xid, tcon, full_path, disposition,
desired_access, create_options, fid, oplock,
buf, cifs_sb);
@@ -340,6 +343,8 @@ cifs_create_get_file_info:
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) &&
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 0d525eb..930a66a 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -177,8 +177,9 @@ cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb,
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 +219,12 @@ cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb,
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);
+ if (server->ops->get_lease_key)
+ server->ops->get_lease_key(inode, fid);
+
+ rc = server->ops->open(xid, tcon, full_path, disposition,
+ desired_access, create_options, fid, oplock, buf,
+ cifs_sb);
if (rc)
goto out;
@@ -566,6 +570,9 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush)
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 de122f7..b344bd3 100644
--- a/fs/cifs/smb2file.c
+++ b/fs/cifs/smb2file.c
@@ -63,6 +63,7 @@ smb2_open_file(const unsigned int xid, struct cifs_tcon *tcon, const char *path,
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 @@ smb2_open_file(const unsigned int xid, struct cifs_tcon *tcon, const char *path,
}
desired_access |= FILE_READ_ATTRIBUTES;
- *oplock = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
+ *smb2_oplock = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
+
+ if (tcon->ses->server->dialect == SMB21_PROT_ID)
+ 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 @@ smb2_open_file(const unsigned int xid, struct cifs_tcon *tcon, const char *path,
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 @@ smb2_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
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 @@ struct smb_version_operations smb21_operations = {
.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 f7e0a54..23ae3b3 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -304,16 +304,12 @@ free_rsp_buf(int resp_buftype, void *rsp)
cifs_buf_release(rsp);
}
-#define SMB2_NUM_PROT 1
+#define SMB2_NUM_PROT 2
#define SMB2_PROT 0
#define SMB21_PROT 1
#define BAD_PROT 0xFFFF
-#define SMB2_PROT_ID 0x0202
-#define SMB21_PROT_ID 0x0210
-#define BAD_PROT_ID 0xFFFF
-
static struct {
int index;
__le16 name;
@@ -392,6 +388,8 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
req->SecurityMode = cpu_to_le16(temp);
req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
+ /* random value */
+ req->ClientGUID[0] = req->ClientGUID[3] = req->ClientGUID[7] = 7;
iov[0].iov_base = (char *)req;
/* 4 for rfc1002 length field */
@@ -868,6 +866,83 @@ SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
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 +953,11 @@ SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
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 +972,6 @@ SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
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 +981,7 @@ SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
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 +992,20 @@ SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
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 +1014,37 @@ SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
*/
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->dialect == SMB2_PROT_ID ||
+ *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 +1069,12 @@ SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
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 102dea8..a9eeb1b 100644
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -38,6 +38,10 @@
* Knowing this helps avoid response buffer allocations and copy in some cases.
*/
+#define SMB2_PROT_ID 0x0202
+#define SMB21_PROT_ID 0x0210
+#define BAD_PROT_ID 0xFFFF
+
/* List of commands in host endian */
#define SMB2_NEGOTIATE_HE 0x0000
#define SMB2_SESSION_SETUP_HE 0x0001
@@ -307,6 +311,8 @@ struct smb2_tree_disconnect_rsp {
#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 @@ struct smb2_create_req {
__le16 NameLength;
__le32 CreateContextsOffset;
__le32 CreateContextsLength;
- __u8 Buffer[1];
+ __u8 Buffer[8];
} __packed;
struct smb2_create_rsp {
@@ -428,6 +434,39 @@ struct smb2_create_rsp {
__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 cpu_to_le32(0x00)
+#define SMB2_LEASE_READ_CACHING cpu_to_le32(0x01)
+#define SMB2_LEASE_HANDLE_CACHING cpu_to_le32(0x02)
+#define SMB2_LEASE_WRITE_CACHING cpu_to_le32(0x04)
+
+#define SMB2_LEASE_FLAG_BREAK_IN_PROGRESS 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 {
--
1.7.1
--
To unsubscribe from this list: send the line "unsubscribe linux-cifs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
