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-rw-r--r--fs/cifs/misc.c147
1 files changed, 55 insertions, 92 deletions
diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index 703ef5c..e2552d2 100644
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -213,55 +213,62 @@ cifs_small_buf_release(void *buf_to_free)
}
/*
- Find a free multiplex id (SMB mid). Otherwise there could be
- mid collisions which might cause problems, demultiplexing the
- wrong response to this request. Multiplex ids could collide if
- one of a series requests takes much longer than the others, or
- if a very large number of long lived requests (byte range
- locks or FindNotify requests) are pending. No more than
- 64K-1 requests can be outstanding at one time. If no
- mids are available, return zero. A future optimization
- could make the combination of mids and uid the key we use
- to demultiplex on (rather than mid alone).
- In addition to the above check, the cifs demultiplex
- code already used the command code as a secondary
- check of the frame and if signing is negotiated the
- response would be discarded if the mid were the same
- but the signature was wrong. Since the mid is not put in the
- pending queue until later (when it is about to be dispatched)
- we do have to limit the number of outstanding requests
- to somewhat less than 64K-1 although it is hard to imagine
- so many threads being in the vfs at one time.
-*/
-__u16 GetNextMid(struct TCP_Server_Info *server)
+ * Find a free multiplex id (SMB mid). Otherwise there could be
+ * mid collisions which might cause problems, demultiplexing the
+ * wrong response to this request. Multiplex ids could collide if
+ * one of a series requests takes much longer than the others, or
+ * if a very large number of long lived requests (byte range
+ * locks or FindNotify requests) are pending. No more than
+ * 64K-1 requests can be outstanding at one time. If no
+ * mids are available, return zero. A future optimization
+ * could make the combination of mids and uid the key we use
+ * to demultiplex on (rather than mid alone).
+ * In addition to the above check, the cifs demultiplex
+ * code already used the command code as a secondary
+ * check of the frame and if signing is negotiated the
+ * response would be discarded if the mid were the same
+ * but the signature was wrong. Since the mid is not put in the
+ * pending queue until later (when it is about to be dispatched)
+ * we do have to limit the number of outstanding requests
+ * to somewhat less than 64K-1 although it is hard to imagine
+ * so many threads being in the vfs at one time.
+ */
+__u64 GetNextMid(struct TCP_Server_Info *server)
{
- __u16 mid = 0;
- __u16 last_mid;
+ __u64 mid = 0;
+ __u16 last_mid, cur_mid;
bool collision;
spin_lock(&GlobalMid_Lock);
- last_mid = server->CurrentMid; /* we do not want to loop forever */
- server->CurrentMid++;
- /* This nested loop looks more expensive than it is.
- In practice the list of pending requests is short,
- fewer than 50, and the mids are likely to be unique
- on the first pass through the loop unless some request
- takes longer than the 64 thousand requests before it
- (and it would also have to have been a request that
- did not time out) */
- while (server->CurrentMid != last_mid) {
+
+ /* mid is 16 bit only for CIFS/SMB */
+ cur_mid = (__u16)((server->CurrentMid) & 0xffff);
+ /* we do not want to loop forever */
+ last_mid = cur_mid;
+ cur_mid++;
+
+ /*
+ * This nested loop looks more expensive than it is.
+ * In practice the list of pending requests is short,
+ * fewer than 50, and the mids are likely to be unique
+ * on the first pass through the loop unless some request
+ * takes longer than the 64 thousand requests before it
+ * (and it would also have to have been a request that
+ * did not time out).
+ */
+ while (cur_mid != last_mid) {
struct mid_q_entry *mid_entry;
unsigned int num_mids;
collision = false;
- if (server->CurrentMid == 0)
- server->CurrentMid++;
+ if (cur_mid == 0)
+ cur_mid++;
num_mids = 0;
list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) {
++num_mids;
- if (mid_entry->mid == server->CurrentMid &&
- mid_entry->midState == MID_REQUEST_SUBMITTED) {
+ if (mid_entry->mid == cur_mid &&
+ mid_entry->mid_state == MID_REQUEST_SUBMITTED) {
/* This mid is in use, try a different one */
collision = true;
break;
@@ -282,10 +289,11 @@ __u16 GetNextMid(struct TCP_Server_Info *server)
server->tcpStatus = CifsNeedReconnect;
if (!collision) {
- mid = server->CurrentMid;
+ mid = (__u64)cur_mid;
+ server->CurrentMid = mid;
break;
}
- server->CurrentMid++;
+ cur_mid++;
}
spin_unlock(&GlobalMid_Lock);
return mid;
@@ -298,8 +306,6 @@ header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
const struct cifs_tcon *treeCon, int word_count
/* length of fixed section (word count) in two byte units */)
{
- struct list_head *temp_item;
- struct cifs_ses *ses;
char *temp = (char *) buffer;
memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */
@@ -329,51 +335,6 @@ header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
/* Uid is not converted */
buffer->Uid = treeCon->ses->Suid;
buffer->Mid = GetNextMid(treeCon->ses->server);
- if (multiuser_mount != 0) {
- /* For the multiuser case, there are few obvious technically */
- /* possible mechanisms to match the local linux user (uid) */
- /* to a valid remote smb user (smb_uid): */
- /* 1) Query Winbind (or other local pam/nss daemon */
- /* for userid/password/logon_domain or credential */
- /* 2) Query Winbind for uid to sid to username mapping */
- /* and see if we have a matching password for existing*/
- /* session for that user perhas getting password by */
- /* adding a new pam_cifs module that stores passwords */
- /* so that the cifs vfs can get at that for all logged*/
- /* on users */
- /* 3) (Which is the mechanism we have chosen) */
- /* Search through sessions to the same server for a */
- /* a match on the uid that was passed in on mount */
- /* with the current processes uid (or euid?) and use */
- /* that smb uid. If no existing smb session for */
- /* that uid found, use the default smb session ie */
- /* the smb session for the volume mounted which is */
- /* the same as would be used if the multiuser mount */
- /* flag were disabled. */
-
- /* BB Add support for establishing new tCon and SMB Session */
- /* with userid/password pairs found on the smb session */
- /* for other target tcp/ip addresses BB */
- if (current_fsuid() != treeCon->ses->linux_uid) {
- cFYI(1, "Multiuser mode and UID "
- "did not match tcon uid");
- spin_lock(&cifs_tcp_ses_lock);
- list_for_each(temp_item, &treeCon->ses->server->smb_ses_list) {
- ses = list_entry(temp_item, struct cifs_ses, smb_ses_list);
- if (ses->linux_uid == current_fsuid()) {
- if (ses->server == treeCon->ses->server) {
- cFYI(1, "found matching uid substitute right smb_uid");
- buffer->Uid = ses->Suid;
- break;
- } else {
- /* BB eventually call cifs_setup_session here */
- cFYI(1, "local UID found but no smb sess with this server exists");
- }
- }
- }
- spin_unlock(&cifs_tcp_ses_lock);
- }
- }
}
if (treeCon->Flags & SMB_SHARE_IS_IN_DFS)
buffer->Flags2 |= SMBFLG2_DFS;
@@ -420,8 +381,10 @@ check_smb_hdr(struct smb_hdr *smb, __u16 mid)
}
int
-checkSMB(struct smb_hdr *smb, __u16 mid, unsigned int total_read)
+checkSMB(char *buf, unsigned int total_read)
{
+ struct smb_hdr *smb = (struct smb_hdr *)buf;
+ __u16 mid = smb->Mid;
__u32 rfclen = be32_to_cpu(smb->smb_buf_length);
__u32 clc_len; /* calculated length */
cFYI(0, "checkSMB Length: 0x%x, smb_buf_length: 0x%x",
@@ -502,8 +465,9 @@ checkSMB(struct smb_hdr *smb, __u16 mid, unsigned int total_read)
}
bool
-is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv)
+is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv)
{
+ struct smb_hdr *buf = (struct smb_hdr *)buffer;
struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf;
struct list_head *tmp, *tmp1, *tmp2;
struct cifs_ses *ses;
@@ -584,7 +548,7 @@ is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv)
cifs_set_oplock_level(pCifsInode,
pSMB->OplockLevel ? OPLOCK_READ : 0);
- queue_work(system_nrt_wq,
+ queue_work(cifsiod_wq,
&netfile->oplock_break);
netfile->oplock_break_cancelled = false;
@@ -604,16 +568,15 @@ is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv)
}
void
-dump_smb(struct smb_hdr *smb_buf, int smb_buf_length)
+dump_smb(void *buf, int smb_buf_length)
{
int i, j;
char debug_line[17];
- unsigned char *buffer;
+ unsigned char *buffer = buf;
if (traceSMB == 0)
return;
- buffer = (unsigned char *) smb_buf;
for (i = 0, j = 0; i < smb_buf_length; i++, j++) {
if (i % 8 == 0) {
/* have reached the beginning of line */
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