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path: root/fs/cifs/cifsglob.h
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* CIFS: Move get_next_mid to ops structPavel Shilovsky2012-06-011-0/+7
| | | | | | Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steve French <sfrench@us.ibm.com>
* cifs: fix oops while traversing open file list (try #4)Shirish Pargaonkar2012-05-231-0/+1
| | | | | | | | | | | | | | | | | | | While traversing the linked list of open file handles, if the identfied file handle is invalid, a reopen is attempted and if it fails, we resume traversing where we stopped and cifs can oops while accessing invalid next element, for list might have changed. So mark the invalid file handle and attempt reopen if no valid file handle is found in rest of the list. If reopen fails, move the invalid file handle to the end of the list and start traversing the list again from the begining. Repeat this four times before giving up and returning an error if file reopen keeps failing. Cc: <stable@vger.kernel.org> Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
* CIFS: Introduce SMB2 mounts as vers=2.1Steve French2012-05-231-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | As with Linux nfs client, which uses "nfsvers=" or "vers=" to indicate which protocol to use for mount, specifying "vers=2.1" will force an SMB2 mount. When vers is not specified CIFS is used "vers=1" We can eventually autonegotiate down from SMB2 to CIFS when SMB2 is stable enough to make it the default, but this is for the future. At that time we could also implement a "maxprotocol" mount option as smbclient and Samba have today, but that would be premature until SMB2 is stable. Intially the SMB2 Kconfig option will depend on "BROKEN" until the merge is complete, and then be "EXPERIMENTAL" When it is no longer experimental we can consider changing the default protocol to attempt first. Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Jeff Layton <jlayton@redhat.com> Acked-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
* CIFS: Move add/set_credits and get_credits_field to ops structurePavel Shilovsky2012-05-231-10/+15
| | | | | | | 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>
* CIFS: Move protocol specific demultiplex thread calls to ops structPavel Shilovsky2012-05-231-0/+6
| | | | | | Acked-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
* CIFS: Move protocol specific part from cifs_readv_receive to ops structPavel Shilovsky2012-05-231-0/+7
| | | | | | | 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>
* CIFS: Move header_size/max_header_size to ops structurePavel Shilovsky2012-05-231-12/+5
| | | | | | | 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>
* CIFS: Move protocol specific part from SendReceive2 to ops structPavel Shilovsky2012-05-231-0/+7
| | | | | | | 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>
* CIFS: Separate protocol specific part from getlkPavel Shilovsky2012-05-171-0/+2
| | | | Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
* CIFS: Separate protocol specific lock type handlingPavel Shilovsky2012-05-161-0/+4
| | | | Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
* CIFS: Convert lock type to 32 bit variablePavel Shilovsky2012-05-161-1/+1
| | | | | | | to handle SMB2 lock type field further. Acked-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
* CIFS: Move locks to cifsFileInfo structurePavel Shilovsky2012-05-161-3/+9
| | | | | | | | | CIFS brlock cache can be used by several file handles if we have a write-caching lease on the file that is supported by SMB2 protocol. Prepate the code to handle this situation correctly by sorting brlocks by a fid to easily push them in portions when lease break comes. Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
* cifs: convert send_nt_cancel into a version specific opJeff Layton2012-05-161-1/+5
| | | | | | | | 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>
* cifs: add a smb_version_operations/values structures and a smb_version enumJeff Layton2012-05-161-0/+19
| | | | | | | | | | | We need a way to dispatch different operations for different versions. Behold the smb_version_operations/values structures. For now, those structures just hold the version enum value and nothing uses them. Eventually, we'll expand them to cover other operations/values as we change the callers to dispatch from here. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
* cifs: remove legacy MultiuserMount optionJeff Layton2012-05-161-6/+1
| | | | | | We've now warned about this for two releases. Remove it for 3.5. Signed-off-by: Jeff Layton <jlayton@redhat.com>
* cifs: call cifs_update_eof with i_lock heldJeff Layton2012-03-231-1/+1
| | | | | | | | cifs_update_eof has the potential to be racy if multiple threads are trying to modify it at the same time. Protect modifications of the server_eof value with the inode->i_lock. Signed-off-by: Jeff Layton <jlayton@redhat.com>
* cifs: make cifsFileInfo_get return the cifsFileInfo pointerJeff Layton2012-03-231-1/+3
| | | | | Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru>
* cifs: add new cifsiod_wq workqueueJeff Layton2012-03-231-0/+1
| | | | | | | | | | ...and convert existing cifs users of system_nrt_wq to use that instead. Also, make it freezable, and set WQ_MEM_RECLAIM since we use it to deal with write reply handling. Signed-off-by: Jeff Layton <jlayton@redhat.com> Acked-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
* CIFS: Change mid_q_entry structure fieldsPavel Shilovsky2012-03-231-5/+5
| | | | | | | to be protocol-unspecific and big enough to keep both CIFS and SMB2 values. Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
* CIFS: Expand CurrentMid fieldPavel Shilovsky2012-03-231-1/+1
| | | | | | | | While in CIFS/SMB we have 16 bit mid, in SMB2 it is 64 bit. Convert the existing field to 64 bit and mask off higher bits for CIFS/SMB. Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
* CIFS: Separate protocol-specific code from cifs_readv_receive codePavel Shilovsky2012-03-231-0/+12
| | | | Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
* CIFS: Separate protocol-specific code from demultiplex codePavel Shilovsky2012-03-231-1/+1
| | | | Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
* CIFS: Separate protocol-specific code from transport routinesPavel Shilovsky2012-03-231-0/+6
| | | | | | that lets us use this functions for SMB2. Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
* CIFS: Delete echo_retries module parmPavel Shilovsky2012-03-211-3/+0
| | | | | | | | | | | It's the essential step before respecting MaxMpxCount value during negotiating because we will keep only one extra slot for sending echo requests. If there is no response during two echo intervals - reconnect the tcp session. Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
* CIFS: Prepare credits code for a slot reservationPavel Shilovsky2012-03-211-2/+12
| | | | | | | | 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>
* CIFS: Introduce credit-based flow controlPavel Shilovsky2012-03-211-4/+7
| | | | | | | | | | 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>
* CIFS: Simplify inFlight logicPavel Shilovsky2012-03-211-1/+20
| | | | | | | | | 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>
* CIFS: Respect negotiated MaxMpxCountPavel Shilovsky2012-03-201-7/+3
| | | | | | | | | | | 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)>
* [CIFS] Fix build break with multiuser patch when LANMAN disabledSteve French2012-01-181-0/+2
| | | | | CC: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
* cifs: propagate umode_tAl Viro2012-01-031-2/+2
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* CIFS: Implement caching mechanism for mandatory brlocksPavel Shilovsky2011-10-241-0/+2
| | | | | | | | | If we have an oplock and negotiate mandatory locking style we handle all brlock requests on the client. Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Acked-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
* cifs: add a callback function to receive the rest of the frameJeff Layton2011-10-191-3/+20
| | | | | | | | | | | | | | | 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>
* cifs: move buffer pointers into TCP_Server_InfoJeff Layton2011-10-191-0/+4
| | | | | | | | | We have several functions that need to access these pointers. Currently that's done with a lot of double pointer passing. Instead, move them into the TCP_Server_Info and simplify the handling. Reviewed-and-Tested-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Jeff Layton <jlayton@redhat.com>
* cifs: keep a reusable kvec array for receivesJeff Layton2011-10-191-0/+2
| | | | | | | | Having to continually allocate a new kvec array is expensive. Allocate one that's big enough, and only reallocate it as needed. Reviewed-and-Tested-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Jeff Layton <jlayton@redhat.com>
* CIFS: Move byte range lock list from fd to inodePavel Shilovsky2011-10-131-3/+4
| | | | | | | that let us do local lock checks before requesting to the server. Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <smfrench@gmail.com>
* CIFS: Simplify byte range locking codePavel Shilovsky2011-10-131-0/+1
| | | | | | | | Split cifs_lock into several functions and let CIFSSMBLock get pid as an argument. Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <smfrench@gmail.com>
* cifs: Add data structures and functions for uid/gid to SID mapping (try #4)Shirish Pargaonkar2011-10-121-0/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add data structures and functions necessary to map a uid and gid to SID. These functions are very similar to the ones used to map a SID to uid and gid. This time, instead of storing sid to id mapping sorted on a sid value, id to sid is stored, sorted on an id. A cifs upcall sends an id (uid or gid) and expects a SID structure in return, if mapping was done successfully. A failed id to sid mapping to EINVAL. This patchset aims to enable chown and chgrp commands when cifsacl mount option is specified, especially to Windows SMB servers. Currently we can't do that. So now along with chmod command, chown and chgrp work. Winbind is used to map id to a SID. chown and chgrp use an upcall to provide an id to winbind and upcall returns with corrosponding SID if any exists. That SID is used to build security descriptor. The DACL part of a security descriptor is not changed by either chown or chgrp functionality. cifs client maintains a separate caches for uid to SID and gid to SID mapping. This is similar to the one used earlier to map SID to id (as part of ID mapping code). I tested it by mounting shares from a Windows (2003) server by authenticating as two users, one at a time, as Administrator and as a ordinary user. And then attempting to change owner of a file on the share. Depending on the permissions/privileges at the server for that file, chown request fails to either open a file (to change the ownership) or to set security descriptor. So it all depends on privileges on the file at the server and what user you are authenticated as at the server, cifs client is just a conduit. I compared the security descriptor during chown command to that what smbcacls sends when it is used with -M OWNNER: option and they are similar. This patchset aim to enable chown and chgrp commands when cifsacl mount option is specified, especially to Windows SMB servers. Currently we can't do that. So now along with chmod command, chown and chgrp work. I tested it by mounting shares from a Windows (2003) server by authenticating as two users, one at a time, as Administrator and as a ordinary user. And then attempting to change owner of a file on the share. Depending on the permissions/privileges at the server for that file, chown request fails to either open a file (to change the ownership) or to set security descriptor. So it all depends on privileges on the file at the server and what user you are authenticated as at the server, cifs client is just a conduit. Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Signed-off-by: Steve French <smfrench@gmail.com>
* cifs: Add mount options for backup intent (try #6)Shirish Pargaonkar2011-10-121-1/+6
| | | | | | | | | | | | | | | | | | | | | | | | Add mount options backupuid and backugid. It allows an authenticated user to access files with the intent to back them up including their ACLs, who may not have access permission but has "Backup files and directories user right" on them (by virtue of being part of the built-in group Backup Operators. When mount options backupuid is specified, cifs client restricts the use of backup intents to the user whose effective user id is specified along with the mount option. When mount options backupgid is specified, cifs client restricts the use of backup intents to the users whose effective user id belongs to the group id specified along with the mount option. If an authenticated user is not part of the built-in group Backup Operators at the server, access to such files is denied, even if allowed by the client. Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
* add new module parameter 'enable_oplocks'Steve French2011-10-121-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Thus spake Jeff Layton: "Making that a module parm would allow you to set that parameter at boot time without needing to add special startup scripts. IMO, all of the procfile "switches" under /proc/fs/cifs should be module parms instead." This patch doesn't alter the default behavior (Oplocks are enabled by default). To disable oplocks when loading the module, use modprobe cifs enable_oplocks=0 (any of '0' or 'n' or 'N' conventions can be used). To disable oplocks at runtime using the new interface, use echo 0 > /sys/module/cifs/parameters/enable_oplocks The older /proc/fs/cifs/OplockEnabled interface will be deprecated after two releases. A subsequent patch will add an warning message about this deprecation. Changes since v2: - make enable_oplocks a 'bool' Changes since v1: - eliminate the use of extra variable by renaming the old one to enable_oplocks and make it an 'int' type. Reported-by: Alexander Swen <alex@swen.nu> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Steve French <smfrench@gmail.com>
* [CIFS] Cleanup use of CONFIG_CIFS_STATS2 ifdef to make transport routines ↵Steve French2011-08-111-7/+49
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | more readable 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>
* cifs: simplify refcounting for oplock breaksJeff Layton2011-07-311-2/+0
| | | | | | | | | | | | | | | | | Currently, we take a sb->s_active reference and a cifsFileInfo reference when an oplock break workqueue job is queued. This is unnecessary and more complicated than it needs to be. Also as Al points out, deactivate_super has non-trivial locking implications so it's best to avoid that if we can. Instead, just cancel any pending oplock breaks for this filehandle synchronously in cifsFileInfo_put after taking it off the lists. That should ensure that this job doesn't outlive the structures it depends on. Reported-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
* cifs: use cifs_dirent in cifs_save_resume_keyChristoph Hellwig2011-07-251-1/+1
| | | | | | Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
* [CIFS] Rename three structures to avoid camel caseSteve French2011-05-271-11/+11
| | | | | | | | | | secMode to sec_mode and cifsTconInfo to cifs_tcon and cifsSesInfo to cifs_ses Signed-off-by: Steve French <sfrench@us.ibm.com>
* CIFS: Add rwpidforward mount optionPavel Shilovsky2011-05-271-0/+1
| | | | | | | | | | | | | | | | | | Add rwpidforward mount option that switches on a mode when we forward pid of a process who opened a file to any read and write operation. This can prevent applications like WINE from failing on read or write operation on a previously locked file region from the same netfd from another process if we use mandatory brlock style. It is actual for WINE because during a run of WINE program two processes work on the same netfd - share the same file struct between several VFS fds: 1) WINE-server does open and lock; 2) WINE-application does read and write. Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
* CIFS: Migrate to shared superblock modelPavel Shilovsky2011-05-271-0/+19
| | | | | | | | | | Add cifs_match_super to use in sget to share superblock between mounts that have the same //server/sharename, credentials and mount options. It helps us to improve performance on work with future SMB2.1 leases. Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
* [CIFS] Migrate from prefixpath logicSteve French2011-05-271-0/+75
| | | | | | | | | | | Now we point superblock to a server share root and set a root dentry appropriately. This let us share superblock between mounts like //server/sharename/foo/bar and //server/sharename/foo further. Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
* CIFS: Use pid saved from cifsFileInfo in writepages and set_file_sizePavel Shilovsky2011-05-261-0/+8
| | | | | | | | | We need it to make them work with mandatory locking style because we can fail in a situation like when kernel need to flush dirty pages and there is a lock held by a process who opened file. Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
* cifs: don't call mid_q_entry->callback under the Global_MidLock (try #5)Jeff Layton2011-05-241-3/+3
| | | | | | | | | | | | | | | | | | | | | 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>
* cifs: Add idmap key and related data structures and functions (try #17 repost)Shirish Pargaonkar2011-05-191-0/+5
| | | | | | | | | | | | | | | | Define (global) data structures to store ids, uids and gids, to which a SID maps. There are two separate trees, one for SID/uid and another one for SID/gid. A new type of key, cifs_idmap_key_type, is used. Keys are instantiated and searched using credential of the root by overriding and restoring the credentials of the caller requesting the key. Id mapping functions are invoked under config option of cifs acl. Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
* Shrink stack space usage in cifs_construct_tconSteve French2011-05-191-1/+2
| | | | | | | | We were reserving MAX_USERNAME (now 256) on stack for something which only needs to fit about 24 bytes ie string krb50x + printf version of uid Signed-off-by: Steve French <sfrench@us.ibm.com>
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