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path: root/fs/cifs/transport.c (follow)
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2012-09-24cifs: change cifs_call_async to use smb_rqst structsJeff Layton1-28/+28
For now, none of the callers populate rq_pages. That will be done for writes in a later patch. While we're at it, change the prototype of setup_async_request not to need a return pointer argument. Just return the pointer to the mid_q_entry or an ERR_PTR. Reviewed-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
2012-09-24cifs: teach signing routines how to deal with arrays of pages in a smb_rqstJeff Layton1-1/+1
Use the smb_send_rqst helper function to kmap each page in the array and update the hash for that chunk. Reviewed-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
2012-09-24cifs: teach smb_send_rqst how to handle arrays of pagesJeff Layton1-2/+54
Add code that allows smb_send_rqst to send an array of pages after the initial kvec array has been sent. For now, we simply kmap the page array and send it using the standard smb_send_kvec function. Eventually, we may want to convert this code to use kernel_sendpage under the hood and avoid the kmap altogether for the page data. Reviewed-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
2012-09-24cifs: cork the socket before a send and uncork it afterwardJeff Layton1-0/+12
We want to send SMBs as "atomically" as possible. Prior to sending any data on the socket, cork it to make sure that no non-full frames go out. Afterward, uncork it to make sure all of the data gets pushed out to the wire. Note that this more or less renders the socket=TCP_NODELAY mount option obsolete. When TCP_CORK and TCP_NODELAY are used on the same socket, TCP_NODELAY is essentially ignored. Acked-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
2012-09-24cifs: convert send code to use smb_rqst structsJeff Layton1-45/+90
Again, just a change in the arguments and some function renaming here. In later patches, we'll change this code to deal with page arrays. In this patch, we add a new smb_send_rqst wrapper and have smb_sendv call that. Then we move most of the existing smb_sendv code into a new function -- smb_send_kvec. This seems a little redundant, but later we'll flesh this out to deal with arrays of pages. Reviewed-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
2012-09-24cifs: change signing routines to deal with smb_rqst structsJeff Layton1-1/+3
We need a way to represent a call to be sent on the wire that does not require having all of the page data kmapped. Behold the smb_rqst struct. This new struct represents an array of kvecs immediately followed by an array of pages. Convert the signing routines to use these structs under the hood and turn the existing functions for this into wrappers around that. For now, we're just changing these functions to take different args. Later, we'll teach them how to deal with arrays of pages. Reviewed-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
2012-09-24CIFS: Enable signing in SMB2Pavel Shilovsky1-12/+12
Use hmac-sha256 and rather than hmac-md5 that is used for CIFS/SMB. Signature field in SMB2 header is 16 bytes instead of 8 bytes. Automatically enable signing by client when requested by the server when signing ability is available to the client. Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Signed-off-by: Sachin Prabhu <sprabhu@redhat.com> Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com> Signed-off-by: Steve French <smfrench@gmail.com>
2012-08-19cifs: print error code if smb signature verification failsSteve French1-3/+6
While trying to debug a SMB signature related issue with Windows Servers figured out it might be easier to debug if we print the error code from cifs_verify_signature(). Also, fix indendation while at it. Signed-off-by: Suresh Jayaraman <sjayaraman@suse.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
2012-07-24CIFS: Setup async request in ops structPavel Shilovsky1-2/+2
Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steve French <smfrench@gmail.com>
2012-07-24CIFS: Make transport routines work with SMB2Pavel Shilovsky1-7/+6
Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <smfrench@gmail.com>
2012-07-24CIFS: Extend credit mechanism to process request typePavel Shilovsky1-31/+39
Split all requests to echos, oplocks and others - each group uses its own credit slot. This is indicated by new flags CIFS_ECHO_OP and CIFS_OBREAK_OP that are not used now for CIFS. This change is required to support SMB2 protocol because of different processing of these commands. Acked-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steve French <smfrench@gmail.com>
2012-07-23cifs: rename cifs_sign_smb2 to cifs_sign_smbvJeff Layton1-2/+2
"smb2" makes me think of the SMB2.x protocol, which isn't at all what this function is for... Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
2012-07-23cifs: remove bogus reset of smb_buf_length in smb_send routinesJeff Layton1-4/+0
There's a comment here about how we don't want to modify this length, but nothing in this function actually does. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
2012-07-16Initialise mid_q_entry before putting it on the pending queueSachin Prabhu1-12/+14
A user reported a crash in cifs_demultiplex_thread() caused by an incorrectly set mid_q_entry->callback() function. It appears that the callback assignment made in cifs_call_async() was not flushed back to memory suggesting that a memory barrier was required here. Changing the code to make sure that the mid_q_entry structure was completely initialised before it was added to the pending queue fixes the problem. Signed-off-by: Sachin Prabhu <sprabhu@redhat.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Signed-off-by: Steve French <smfrench@gmail.com>
2012-06-01CIFS: Move get_next_mid to ops structPavel Shilovsky1-1/+1
Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steve French <sfrench@us.ibm.com>
2012-05-23CIFS: Move add/set_credits and get_credits_field to ops structurePavel Shilovsky1-11/+12
Acked-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
2012-05-23CIFS: Move protocol specific part from SendReceive2 to ops structPavel Shilovsky1-3/+4
Acked-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
2012-05-16cifs: convert send_nt_cancel into a version specific opJeff Layton1-38/+8
For SMB2, this should be a no-op. Obviously if we wanted to do something for the SMB2 case, we could also define an operation here for it. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
2012-03-23CIFS: Change mid_q_entry structure fieldsPavel Shilovsky1-26/+26
to be protocol-unspecific and big enough to keep both CIFS and SMB2 values. Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
2012-03-23CIFS: Separate protocol-specific code from demultiplex codePavel Shilovsky1-2/+2
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
2012-03-23CIFS: Separate protocol-specific code from transport routinesPavel Shilovsky1-72/+99
that lets us use this functions for SMB2. Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
2012-03-21CIFS: Prepare credits code for a slot reservationPavel Shilovsky1-8/+14
that is essential for CIFS/SMB/SMB2 oplock breaks and SMB2 echos. Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
2012-03-21CIFS: Make wait_for_free_request killablePavel Shilovsky1-1/+6
to let us kill the proccess if it hangs waiting for a credit when the session is down and echo is disabled. Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
2012-03-21CIFS: Introduce credit-based flow controlPavel Shilovsky1-24/+20
and send no more than credits value requests at once. For SMB/CIFS it's trivial: increment this value by receiving any message and decrement by sending one. Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
2012-03-21CIFS: Simplify inFlight logicPavel Shilovsky1-22/+23
by making it as unsigned integer and surround access with req_lock from server structure. Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
2012-03-20CIFS: Respect negotiated MaxMpxCountPavel Shilovsky1-2/+2
Some servers sets this value less than 50 that was hardcoded and we lost the connection if when we exceed this limit. Fix this by respecting this value - not sending more than the server allows. Cc: stable@kernel.org Reviewed-by: Jeff Layton <jlayton@samba.org> Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <stevef@smf-gateway.(none)>
2011-10-19cifs, freezer: add wait_event_freezekillable and have cifs use itJeff Layton1-1/+2
CIFS currently uses wait_event_killable to put tasks to sleep while they await replies from the server. That function though does not allow the freezer to run. In many cases, the network interface may be going down anyway, in which case the reply will never come. The client then ends up blocking the computer from suspending. Fix this by adding a new wait_event_freezable variant -- wait_event_freezekillable. The idea is to combine the behavior of wait_event_killable and wait_event_freezable -- put the task to sleep and only allow it to be awoken by fatal signals, but also allow the freezer to do its job. Signed-off-by: Jeff Layton <jlayton@redhat.com>
2011-10-19cifs: add a callback function to receive the rest of the frameJeff Layton1-2/+3
In order to handle larger SMBs for readpages and other calls, we want to be able to read into a preallocated set of buffers. Rather than changing all of the existing code to preallocate buffers however, we instead add a receive callback function to the MID. cifsd will call this function once the mid_q_entry has been identified in order to receive the rest of the SMB. If the mid can't be identified or the receive pointer is unset, then the standard 3rd phase receive function will be called. Reviewed-and-Tested-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Jeff Layton <jlayton@redhat.com>
2011-10-12cifs: consolidate signature generating codeJeff Layton1-3/+8
We have two versions of signature generating code. A vectorized and non-vectorized version. Eliminate a large chunk of cut-and-paste code by turning the non-vectorized version into a wrapper around the vectorized one. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
2011-08-11[CIFS] Cleanup use of CONFIG_CIFS_STATS2 ifdef to make transport routines more readableSteve French1-34/+17
Christoph had requested that the stats related code (in CONFIG_CIFS_STATS2) be moved into helpers to make code flow more readable. This patch should help. For example the following section from transport.c spin_unlock(&GlobalMid_Lock); atomic_inc(&ses->server->num_waiters); wait_event(ses->server->request_q, atomic_read(&ses->server->inFlight) < cifs_max_pending); atomic_dec(&ses->server->num_waiters); spin_lock(&GlobalMid_Lock); becomes simpler (with the patch below): spin_unlock(&GlobalMid_Lock); cifs_num_waiters_inc(server); wait_event(server->request_q, atomic_read(&server->inFlight) < cifs_max_pending); cifs_num_waiters_dec(server); spin_lock(&GlobalMid_Lock); Reviewed-by: Jeff Layton <jlayton@redhat.com> CC: Christoph Hellwig <hch@infradead.org> Signed-off-by: Steve French <sfrench@us.ibm.com> Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru>
2011-08-03CIFS: Fix missing a decrement of inFlight valuePavel Shilovsky1-0/+2
if we failed on getting mid entry in cifs_call_async. Cc: stable@kernel.org Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-05-27[CIFS] Rename three structures to avoid camel caseSteve French1-10/+10
secMode to sec_mode and cifsTconInfo to cifs_tcon and cifsSesInfo to cifs_ses Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-05-24cifs: don't call mid_q_entry->callback under the Global_MidLock (try #5)Jeff Layton1-15/+8
Minor revision to the last version of this patch -- the only difference is the fix to the cFYI statement in cifs_reconnect. Holding the spinlock while we call this function means that it can't sleep, which really limits what it can do. Taking it out from under the spinlock also means less contention for this global lock. Change the semantics such that the Global_MidLock is not held when the callback is called. To do this requires that we take extra care not to have sync_mid_result remove the mid from the list when the mid is in a state where that has already happened. This prevents list corruption when the mid is sitting on a private list for reconnect or when cifsd is coming down. Reviewed-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-05-23cifs: add ignore_pend flag to cifs_call_asyncJeff Layton1-2/+3
The current code always ignores the max_pending limit. Have it instead only optionally ignore the pending limit. For CIFSSMBEcho, we need to ignore it to make sure they always can go out. For async reads, writes and potentially other calls, we need to respect it. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-05-23cifs: make cifs_send_async take a kvec arrayJeff Layton1-6/+7
We'll need this for async writes, so convert the call to take a kvec array. CIFSSMBEcho is changed to put a kvec on the stack and pass in the SMB buffer using that. Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-05-23cifs: consolidate SendReceive response checksJeff Layton1-116/+41
Further consolidate the SendReceive code by moving the checks run over the packet into a separate function that all the SendReceive variants can call. We can also eliminate the check for a receive_len that's too big or too small. cifs_demultiplex_thread already checks that and disconnects the socket if that occurs, while setting the midStatus to MALFORMED. It'll never call this code if that's the case. Finally do a little cleanup. Use "goto out" on errors so that the flow of code in the normal case is more evident. Also switch the logErr variable in map_smb_to_linux_error to a bool. Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-05-19cifs: keep BCC in little-endian formatJeff Layton1-18/+1
This is the same patch as originally posted, just with some merge conflicts fixed up... Currently, the ByteCount is usually converted to host-endian on receive. This is confusing however, as we need to keep two sets of routines for accessing it, and keep track of when to use each routine. Munging received packets like this also limits when the signature can be calulated. Simplify the code by keeping the received ByteCount in little-endian format. This allows us to eliminate a set of routines for accessing it and we can now drop the *_le suffixes from the accessor functions since that's now implied. While we're at it, switch all of the places that read the ByteCount directly to use the get_bcc inline which should also clean up some unaligned accesses. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-05-19consistently use smb_buf_length as be32 for cifs (try 3)Steve French1-26/+21
There is one big endian field in the cifs protocol, the RFC1001 length, which cifs code (unlike in the smb2 code) had been handling as u32 until the last possible moment, when it was converted to be32 (its native form) before sending on the wire. To remove the last sparse endian warning, and to make this consistent with the smb2 implementation (which always treats the fields in their native size and endianness), convert all uses of smb_buf_length to be32. This version incorporates Christoph's comment about using be32_add_cpu, and fixes a typo in the second version of the patch. Signed-off-by: Steve French <sfrench@us.ibm.com> Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-02-11cifs: don't always drop malformed replies on the floor (try #3)Jeff Layton1-0/+3
Slight revision to this patch...use min_t() instead of conditional assignment. Also, remove the FIXME comment and replace it with the explanation that Steve gave earlier. After receiving a packet, we currently check the header. If it's no good, then we toss it out and continue the loop, leaving the caller waiting on that response. In cases where the packet has length inconsistencies, but the MID is valid, this leads to unneeded delays. That's especially problematic now that the client waits indefinitely for responses. Instead, don't immediately discard the packet if checkSMB fails. Try to find a matching mid_q_entry, mark it as having a malformed response and issue the callback. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-02-04cifs: enable signing flag in SMB header when server has it onJeff Layton1-0/+4
cifs_sign_smb only generates a signature if the correct Flags2 bit is set. Make sure that it gets set correctly if we're sending an async call. This patch fixes: https://bugzilla.kernel.org/show_bug.cgi?id=28142 Reported-and-Tested-by: JG <jg@cms.ac> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-01-31cifs: don't pop a printk when sending on a socket is interruptedJeff Layton1-2/+2
If we kill the process while it's sending on a socket then the kernel_sendmsg will return -EINTR. This is normal. No need to spam the ring buffer with this info. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-01-31cifs: send an NT_CANCEL request when a process is signalledJeff Layton1-3/+12
Use the new send_nt_cancel function to send an NT_CANCEL when the process is delivered a fatal signal. This is a "best effort" enterprise however, so don't bother to check the return code. There's nothing we can reasonably do if it fails anyway. Reviewed-by: Pavel Shilovsky <piastryyy@gmail.com> Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-01-31cifs: handle cancelled requests betterJeff Layton1-7/+36
Currently, when a request is cancelled via signal, we delete the mid immediately. If the request was already transmitted however, the client is still likely to receive a response. When it does, it won't recognize it however and will pop a printk. It's also a little dangerous to just delete the mid entry like this. We may end up reusing that mid. If we do then we could potentially get the response from the first request confused with the later one. Prevent the reuse of mids by marking them as cancelled and keeping them on the pending_mid_q list. If the reply comes in, we'll delete it from the list then. If it never comes, then we'll delete it at reconnect or when cifsd comes down. Reviewed-by: Pavel Shilovsky <piastryyy@gmail.com> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-01-20cifs: use get/put_unaligned functions to access ByteCountJeff Layton1-5/+4
It's possible that when we access the ByteCount that the alignment will be off. Most CPUs deal with that transparently, but there's usually some performance impact. Some CPUs raise an exception on unaligned accesses. Fix this by accessing the byte count using the get_unaligned and put_unaligned inlined functions. While we're at it, fix the types of some of the variables that end up getting returns from these functions. Acked-by: Pavel Shilovsky <piastryyy@gmail.com> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-01-20cifs: mangle existing header for SMB_COM_NT_CANCELJeff Layton1-25/+38
The NT_CANCEL command looks just like the original command, except for a few small differences. The send_nt_cancel function however currently takes a tcon, which we don't have in SendReceive and SendReceive2. Instead of "respinning" the entire header for an NT_CANCEL, just mangle the existing header by replacing just the fields we need. This means we don't need a tcon and allows us to call it from other places. Reviewed-by: Pavel Shilovsky <piastryyy@gmail.com> Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-01-20cifs: remove code for setting timeouts on requestsJeff Layton1-1/+1
Since we don't time out individual requests anymore, remove the code that we used to use for setting timeouts on different requests. Reviewed-by: Pavel Shilovsky <piastryyy@gmail.com> Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-01-20cifs: add ability to send an echo requestJeff Layton1-1/+1
Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-01-20cifs: add cifs_call_asyncJeff Layton1-1/+57
Add a function that will send a request, and set up the mid for an async reply. Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-01-20cifs: allow for different handling of received responseJeff Layton1-2/+17
In order to incorporate async requests, we need to allow for a more general way to do things on receive, rather than just waking up a process. Turn the task pointer in the mid_q_entry into a callback function and a generic data pointer. When a response comes in, or the socket is reconnected, cifsd can call the callback function in order to wake up the process. The default is to just wake up the current process which should mean no change in behavior for existing code. Also, clean up the locking in cifs_reconnect. There doesn't seem to be any need to hold both the srv_mutex and GlobalMid_Lock when walking the list of mids. Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-01-20cifs: clean up sync_mid_resultJeff Layton1-17/+18
Make it use a switch statement based on the value of the midStatus. If the resp_buf is set, then MID_RESPONSE_RECEIVED is too. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
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