CIFS: Add oplock break support for SMB2

Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Pavel Shilovsky 2012-09-18 16:20:33 -07:00 committed by Steve French
parent 95a3f2f377
commit 983c88a497
5 changed files with 141 additions and 2 deletions

View File

@ -142,8 +142,8 @@ smb2_check_message(char *buf, unsigned int length)
}
if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) {
if (hdr->Status == 0 ||
pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2) {
if (command != SMB2_OPLOCK_BREAK_HE && (hdr->Status == 0 ||
pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2)) {
/* error packets have 9 byte structure size */
cERROR(1, "Illegal response size %u for command %d",
le16_to_cpu(pdu->StructureSize2), command);
@ -162,6 +162,9 @@ smb2_check_message(char *buf, unsigned int length)
if (4 + len != clc_len) {
cFYI(1, "Calculated size %u length %u mismatch mid %llu",
clc_len, 4 + len, mid);
/* Windows 7 server returns 24 bytes more */
if (clc_len + 20 == len && command == SMB2_OPLOCK_BREAK_HE)
return 0;
/* server can return one byte more */
if (clc_len == 4 + len + 1)
return 0;
@ -356,3 +359,72 @@ cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb)
CIFS_MOUNT_MAP_SPECIAL_CHR);
return to;
}
bool
smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
{
struct smb2_oplock_break *rsp = (struct smb2_oplock_break *)buffer;
struct list_head *tmp, *tmp1, *tmp2;
struct cifs_ses *ses;
struct cifs_tcon *tcon;
struct cifsInodeInfo *cinode;
struct cifsFileInfo *cfile;
cFYI(1, "Checking for oplock break");
if (rsp->hdr.Command != SMB2_OPLOCK_BREAK)
return false;
if (le16_to_cpu(rsp->StructureSize) !=
smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
return false;
}
cFYI(1, "oplock level 0x%d", rsp->OplockLevel);
/* look up tcon based on tid & uid */
spin_lock(&cifs_tcp_ses_lock);
list_for_each(tmp, &server->smb_ses_list) {
ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
list_for_each(tmp1, &ses->tcon_list) {
tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
spin_lock(&cifs_file_list_lock);
list_for_each(tmp2, &tcon->openFileList) {
cfile = list_entry(tmp2, struct cifsFileInfo,
tlist);
if (rsp->PersistentFid !=
cfile->fid.persistent_fid ||
rsp->VolatileFid !=
cfile->fid.volatile_fid)
continue;
cFYI(1, "file id match, oplock break");
cinode = CIFS_I(cfile->dentry->d_inode);
if (!cinode->clientCanCacheAll &&
rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE)
cfile->oplock_break_cancelled = true;
else
cfile->oplock_break_cancelled = false;
smb2_set_oplock_level(cinode,
rsp->OplockLevel ? SMB2_OPLOCK_LEVEL_II : 0);
queue_work(cifsiod_wq, &cfile->oplock_break);
spin_unlock(&cifs_file_list_lock);
spin_unlock(&cifs_tcp_ses_lock);
return true;
}
spin_unlock(&cifs_file_list_lock);
spin_unlock(&cifs_tcp_ses_lock);
cFYI(1, "No matching file for oplock break");
return true;
}
}
spin_unlock(&cifs_tcp_ses_lock);
cFYI(1, "Can not process oplock break for non-existent connection");
return false;
}

View File

@ -65,6 +65,17 @@ smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
server->in_flight--;
if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
rc = change_conf(server);
/*
* Sometimes server returns 0 credits on oplock break ack - we need to
* rebalance credits in this case.
*/
else if (server->in_flight > 0 && server->oplock_credits == 0 &&
server->oplocks) {
if (server->credits > 1) {
server->credits--;
server->oplock_credits++;
}
}
spin_unlock(&server->req_lock);
wake_up(&server->request_q);
if (rc)
@ -502,6 +513,15 @@ smb2_is_status_pending(char *buf, struct TCP_Server_Info *server, int length)
return true;
}
static int
smb2_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
struct cifsInodeInfo *cinode)
{
return SMB2_oplock_break(0, tcon, fid->persistent_fid,
fid->volatile_fid,
cinode->clientCanCacheRead ? 1 : 0);
}
struct smb_version_operations smb21_operations = {
.setup_request = smb2_setup_request,
.setup_async_request = smb2_setup_async_request,
@ -519,6 +539,7 @@ struct smb_version_operations smb21_operations = {
.dump_detail = smb2_dump_detail,
.clear_stats = smb2_clear_stats,
.print_stats = smb2_print_stats,
.is_oplock_break = smb2_is_valid_oplock_break,
.need_neg = smb2_need_neg,
.negotiate = smb2_negotiate,
.negotiate_wsize = smb2_negotiate_wsize,
@ -556,6 +577,7 @@ struct smb_version_operations smb21_operations = {
.close_dir = smb2_close_dir,
.calc_smb_size = smb2_calc_size,
.is_status_pending = smb2_is_status_pending,
.oplock_response = smb2_oplock_response,
};
struct smb_version_values smb21_values = {

View File

@ -1941,3 +1941,33 @@ SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
current->tgid, FILE_BASIC_INFORMATION, 1,
(void **)&buf, &size);
}
int
SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
const u64 persistent_fid, const u64 volatile_fid,
__u8 oplock_level)
{
int rc;
struct smb2_oplock_break *req = NULL;
cFYI(1, "SMB2_oplock_break");
rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
if (rc)
return rc;
req->VolatileFid = volatile_fid;
req->PersistentFid = persistent_fid;
req->OplockLevel = oplock_level;
req->hdr.CreditRequest = cpu_to_le16(1);
rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
/* SMB2 buffer freed by function above */
if (rc) {
cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
cFYI(1, "Send error in Oplock Break = %d", rc);
}
return rc;
}

View File

@ -615,6 +615,16 @@ struct smb2_set_info_rsp {
__le16 StructureSize; /* Must be 2 */
} __packed;
struct smb2_oplock_break {
struct smb2_hdr hdr;
__le16 StructureSize; /* Must be 24 */
__u8 OplockLevel;
__u8 Reserved;
__le32 Reserved2;
__u64 PersistentFid;
__u64 VolatileFid;
} __packed;
/*
* PDU infolevel structure definitions
* BB consider moving to a different header

View File

@ -49,6 +49,8 @@ extern int smb2_setup_async_request(struct TCP_Server_Info *server,
struct kvec *iov, unsigned int nvec,
struct mid_q_entry **ret_mid);
extern void smb2_echo_request(struct work_struct *work);
extern bool smb2_is_valid_oplock_break(char *buffer,
struct TCP_Server_Info *srv);
extern void move_smb2_info_to_cifs(FILE_ALL_INFO *dst,
struct smb2_file_all_info *src);
@ -133,5 +135,8 @@ extern int SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon,
extern int SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid,
FILE_BASIC_INFO *buf);
extern int SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
const u64 persistent_fid, const u64 volatile_fid,
const __u8 oplock_level);
#endif /* _SMB2PROTO_H */