[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/fs/cifs/misc.c b/ap/os/linux/linux-3.4.x/fs/cifs/misc.c
new file mode 100644
index 0000000..c29d1aa
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/cifs/misc.c
@@ -0,0 +1,721 @@
+/*
+ * fs/cifs/misc.c
+ *
+ * Copyright (C) International Business Machines Corp., 2002,2008
+ * Author(s): Steve French (sfrench@us.ibm.com)
+ *
+ * This library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/slab.h>
+#include <linux/ctype.h>
+#include <linux/mempool.h>
+#include "cifspdu.h"
+#include "cifsglob.h"
+#include "cifsproto.h"
+#include "cifs_debug.h"
+#include "smberr.h"
+#include "nterr.h"
+#include "cifs_unicode.h"
+
+extern mempool_t *cifs_sm_req_poolp;
+extern mempool_t *cifs_req_poolp;
+
+/* The xid serves as a useful identifier for each incoming vfs request,
+ in a similar way to the mid which is useful to track each sent smb,
+ and CurrentXid can also provide a running counter (although it
+ will eventually wrap past zero) of the total vfs operations handled
+ since the cifs fs was mounted */
+
+unsigned int
+_GetXid(void)
+{
+ unsigned int xid;
+
+ spin_lock(&GlobalMid_Lock);
+ GlobalTotalActiveXid++;
+
+ /* keep high water mark for number of simultaneous ops in filesystem */
+ if (GlobalTotalActiveXid > GlobalMaxActiveXid)
+ GlobalMaxActiveXid = GlobalTotalActiveXid;
+ if (GlobalTotalActiveXid > 65000)
+ cFYI(1, "warning: more than 65000 requests active");
+ xid = GlobalCurrentXid++;
+ spin_unlock(&GlobalMid_Lock);
+ return xid;
+}
+
+void
+_FreeXid(unsigned int xid)
+{
+ spin_lock(&GlobalMid_Lock);
+ /* if (GlobalTotalActiveXid == 0)
+ BUG(); */
+ GlobalTotalActiveXid--;
+ spin_unlock(&GlobalMid_Lock);
+}
+
+struct cifs_ses *
+sesInfoAlloc(void)
+{
+ struct cifs_ses *ret_buf;
+
+ ret_buf = kzalloc(sizeof(struct cifs_ses), GFP_KERNEL);
+ if (ret_buf) {
+ atomic_inc(&sesInfoAllocCount);
+ ret_buf->status = CifsNew;
+ ++ret_buf->ses_count;
+ INIT_LIST_HEAD(&ret_buf->smb_ses_list);
+ INIT_LIST_HEAD(&ret_buf->tcon_list);
+ mutex_init(&ret_buf->session_mutex);
+ }
+ return ret_buf;
+}
+
+void
+sesInfoFree(struct cifs_ses *buf_to_free)
+{
+ if (buf_to_free == NULL) {
+ cFYI(1, "Null buffer passed to sesInfoFree");
+ return;
+ }
+
+ atomic_dec(&sesInfoAllocCount);
+ kfree(buf_to_free->serverOS);
+ kfree(buf_to_free->serverDomain);
+ kfree(buf_to_free->serverNOS);
+ if (buf_to_free->password) {
+ memset(buf_to_free->password, 0, strlen(buf_to_free->password));
+ kfree(buf_to_free->password);
+ }
+ kfree(buf_to_free->user_name);
+ kfree(buf_to_free->domainName);
+ kfree(buf_to_free);
+}
+
+struct cifs_tcon *
+tconInfoAlloc(void)
+{
+ struct cifs_tcon *ret_buf;
+ ret_buf = kzalloc(sizeof(struct cifs_tcon), GFP_KERNEL);
+ if (ret_buf) {
+ atomic_inc(&tconInfoAllocCount);
+ ret_buf->tidStatus = CifsNew;
+ ++ret_buf->tc_count;
+ INIT_LIST_HEAD(&ret_buf->openFileList);
+ INIT_LIST_HEAD(&ret_buf->tcon_list);
+#ifdef CONFIG_CIFS_STATS
+ spin_lock_init(&ret_buf->stat_lock);
+#endif
+ }
+ return ret_buf;
+}
+
+void
+tconInfoFree(struct cifs_tcon *buf_to_free)
+{
+ if (buf_to_free == NULL) {
+ cFYI(1, "Null buffer passed to tconInfoFree");
+ return;
+ }
+ atomic_dec(&tconInfoAllocCount);
+ kfree(buf_to_free->nativeFileSystem);
+ if (buf_to_free->password) {
+ memset(buf_to_free->password, 0, strlen(buf_to_free->password));
+ kfree(buf_to_free->password);
+ }
+ kfree(buf_to_free);
+}
+
+struct smb_hdr *
+cifs_buf_get(void)
+{
+ struct smb_hdr *ret_buf = NULL;
+
+/* We could use negotiated size instead of max_msgsize -
+ but it may be more efficient to always alloc same size
+ albeit slightly larger than necessary and maxbuffersize
+ defaults to this and can not be bigger */
+ ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS);
+
+ /* clear the first few header bytes */
+ /* for most paths, more is cleared in header_assemble */
+ if (ret_buf) {
+ memset(ret_buf, 0, sizeof(struct smb_hdr) + 3);
+ atomic_inc(&bufAllocCount);
+#ifdef CONFIG_CIFS_STATS2
+ atomic_inc(&totBufAllocCount);
+#endif /* CONFIG_CIFS_STATS2 */
+ }
+
+ return ret_buf;
+}
+
+void
+cifs_buf_release(void *buf_to_free)
+{
+ if (buf_to_free == NULL) {
+ /* cFYI(1, "Null buffer passed to cifs_buf_release");*/
+ return;
+ }
+ mempool_free(buf_to_free, cifs_req_poolp);
+
+ atomic_dec(&bufAllocCount);
+ return;
+}
+
+struct smb_hdr *
+cifs_small_buf_get(void)
+{
+ struct smb_hdr *ret_buf = NULL;
+
+/* We could use negotiated size instead of max_msgsize -
+ but it may be more efficient to always alloc same size
+ albeit slightly larger than necessary and maxbuffersize
+ defaults to this and can not be bigger */
+ ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS);
+ if (ret_buf) {
+ /* No need to clear memory here, cleared in header assemble */
+ /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
+ atomic_inc(&smBufAllocCount);
+#ifdef CONFIG_CIFS_STATS2
+ atomic_inc(&totSmBufAllocCount);
+#endif /* CONFIG_CIFS_STATS2 */
+
+ }
+ return ret_buf;
+}
+
+void
+cifs_small_buf_release(void *buf_to_free)
+{
+
+ if (buf_to_free == NULL) {
+ cFYI(1, "Null buffer passed to cifs_small_buf_release");
+ return;
+ }
+ mempool_free(buf_to_free, cifs_sm_req_poolp);
+
+ atomic_dec(&smBufAllocCount);
+ return;
+}
+
+/*
+ * 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)
+{
+ __u64 mid = 0;
+ __u16 last_mid, cur_mid;
+ bool collision;
+
+ spin_lock(&GlobalMid_Lock);
+
+ /* 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 (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 == cur_mid &&
+ mid_entry->mid_state == MID_REQUEST_SUBMITTED) {
+ /* This mid is in use, try a different one */
+ collision = true;
+ break;
+ }
+ }
+
+ /*
+ * if we have more than 32k mids in the list, then something
+ * is very wrong. Possibly a local user is trying to DoS the
+ * box by issuing long-running calls and SIGKILL'ing them. If
+ * we get to 2^16 mids then we're in big trouble as this
+ * function could loop forever.
+ *
+ * Go ahead and assign out the mid in this situation, but force
+ * an eventual reconnect to clean out the pending_mid_q.
+ */
+ if (num_mids > 32768)
+ server->tcpStatus = CifsNeedReconnect;
+
+ if (!collision) {
+ mid = (__u64)cur_mid;
+ server->CurrentMid = mid;
+ break;
+ }
+ cur_mid++;
+ }
+ spin_unlock(&GlobalMid_Lock);
+ return mid;
+}
+
+/* NB: MID can not be set if treeCon not passed in, in that
+ case it is responsbility of caller to set the mid */
+void
+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 */
+
+ buffer->smb_buf_length = cpu_to_be32(
+ (2 * word_count) + sizeof(struct smb_hdr) -
+ 4 /* RFC 1001 length field does not count */ +
+ 2 /* for bcc field itself */) ;
+
+ buffer->Protocol[0] = 0xFF;
+ buffer->Protocol[1] = 'S';
+ buffer->Protocol[2] = 'M';
+ buffer->Protocol[3] = 'B';
+ buffer->Command = smb_command;
+ buffer->Flags = 0x00; /* case sensitive */
+ buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES;
+ buffer->Pid = cpu_to_le16((__u16)current->tgid);
+ buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16));
+ if (treeCon) {
+ buffer->Tid = treeCon->tid;
+ if (treeCon->ses) {
+ if (treeCon->ses->capabilities & CAP_UNICODE)
+ buffer->Flags2 |= SMBFLG2_UNICODE;
+ if (treeCon->ses->capabilities & CAP_STATUS32)
+ buffer->Flags2 |= SMBFLG2_ERR_STATUS;
+
+ /* 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;
+ if (treeCon->nocase)
+ buffer->Flags |= SMBFLG_CASELESS;
+ if ((treeCon->ses) && (treeCon->ses->server))
+ if (treeCon->ses->server->sec_mode &
+ (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
+ buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
+ }
+
+/* endian conversion of flags is now done just before sending */
+ buffer->WordCount = (char) word_count;
+ return;
+}
+
+static int
+check_smb_hdr(struct smb_hdr *smb, __u16 mid)
+{
+ /* does it have the right SMB "signature" ? */
+ if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) {
+ cERROR(1, "Bad protocol string signature header 0x%x",
+ *(unsigned int *)smb->Protocol);
+ return 1;
+ }
+
+ /* Make sure that message ids match */
+ if (mid != smb->Mid) {
+ cERROR(1, "Mids do not match. received=%u expected=%u",
+ smb->Mid, mid);
+ return 1;
+ }
+
+ /* if it's a response then accept */
+ if (smb->Flags & SMBFLG_RESPONSE)
+ return 0;
+
+ /* only one valid case where server sends us request */
+ if (smb->Command == SMB_COM_LOCKING_ANDX)
+ return 0;
+
+ cERROR(1, "Server sent request, not response. mid=%u", smb->Mid);
+ return 1;
+}
+
+int
+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",
+ total_read, rfclen);
+
+ /* is this frame too small to even get to a BCC? */
+ if (total_read < 2 + sizeof(struct smb_hdr)) {
+ if ((total_read >= sizeof(struct smb_hdr) - 1)
+ && (smb->Status.CifsError != 0)) {
+ /* it's an error return */
+ smb->WordCount = 0;
+ /* some error cases do not return wct and bcc */
+ return 0;
+ } else if ((total_read == sizeof(struct smb_hdr) + 1) &&
+ (smb->WordCount == 0)) {
+ char *tmp = (char *)smb;
+ /* Need to work around a bug in two servers here */
+ /* First, check if the part of bcc they sent was zero */
+ if (tmp[sizeof(struct smb_hdr)] == 0) {
+ /* some servers return only half of bcc
+ * on simple responses (wct, bcc both zero)
+ * in particular have seen this on
+ * ulogoffX and FindClose. This leaves
+ * one byte of bcc potentially unitialized
+ */
+ /* zero rest of bcc */
+ tmp[sizeof(struct smb_hdr)+1] = 0;
+ return 0;
+ }
+ cERROR(1, "rcvd invalid byte count (bcc)");
+ } else {
+ cERROR(1, "Length less than smb header size");
+ }
+ return -EIO;
+ }
+
+ /* otherwise, there is enough to get to the BCC */
+ if (check_smb_hdr(smb, mid))
+ return -EIO;
+ clc_len = smbCalcSize(smb);
+
+ if (4 + rfclen != total_read) {
+ cERROR(1, "Length read does not match RFC1001 length %d",
+ rfclen);
+ return -EIO;
+ }
+
+ if (4 + rfclen != clc_len) {
+ /* check if bcc wrapped around for large read responses */
+ if ((rfclen > 64 * 1024) && (rfclen > clc_len)) {
+ /* check if lengths match mod 64K */
+ if (((4 + rfclen) & 0xFFFF) == (clc_len & 0xFFFF))
+ return 0; /* bcc wrapped */
+ }
+ cFYI(1, "Calculated size %u vs length %u mismatch for mid=%u",
+ clc_len, 4 + rfclen, smb->Mid);
+
+ if (4 + rfclen < clc_len) {
+ cERROR(1, "RFC1001 size %u smaller than SMB for mid=%u",
+ rfclen, smb->Mid);
+ return -EIO;
+ } else if (rfclen > clc_len + 512) {
+ /*
+ * Some servers (Windows XP in particular) send more
+ * data than the lengths in the SMB packet would
+ * indicate on certain calls (byte range locks and
+ * trans2 find first calls in particular). While the
+ * client can handle such a frame by ignoring the
+ * trailing data, we choose limit the amount of extra
+ * data to 512 bytes.
+ */
+ cERROR(1, "RFC1001 size %u more than 512 bytes larger "
+ "than SMB for mid=%u", rfclen, smb->Mid);
+ return -EIO;
+ }
+ }
+ return 0;
+}
+
+bool
+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;
+ struct cifs_tcon *tcon;
+ struct cifsInodeInfo *pCifsInode;
+ struct cifsFileInfo *netfile;
+
+ cFYI(1, "Checking for oplock break or dnotify response");
+ if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&
+ (pSMB->hdr.Flags & SMBFLG_RESPONSE)) {
+ struct smb_com_transaction_change_notify_rsp *pSMBr =
+ (struct smb_com_transaction_change_notify_rsp *)buf;
+ struct file_notify_information *pnotify;
+ __u32 data_offset = 0;
+ if (get_bcc(buf) > sizeof(struct file_notify_information)) {
+ data_offset = le32_to_cpu(pSMBr->DataOffset);
+
+ pnotify = (struct file_notify_information *)
+ ((char *)&pSMBr->hdr.Protocol + data_offset);
+ cFYI(1, "dnotify on %s Action: 0x%x",
+ pnotify->FileName, pnotify->Action);
+ /* cifs_dump_mem("Rcvd notify Data: ",buf,
+ sizeof(struct smb_hdr)+60); */
+ return true;
+ }
+ if (pSMBr->hdr.Status.CifsError) {
+ cFYI(1, "notify err 0x%d",
+ pSMBr->hdr.Status.CifsError);
+ return true;
+ }
+ return false;
+ }
+ if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX)
+ return false;
+ if (pSMB->hdr.Flags & SMBFLG_RESPONSE) {
+ /* no sense logging error on invalid handle on oplock
+ break - harmless race between close request and oplock
+ break response is expected from time to time writing out
+ large dirty files cached on the client */
+ if ((NT_STATUS_INVALID_HANDLE) ==
+ le32_to_cpu(pSMB->hdr.Status.CifsError)) {
+ cFYI(1, "invalid handle on oplock break");
+ return true;
+ } else if (ERRbadfid ==
+ le16_to_cpu(pSMB->hdr.Status.DosError.Error)) {
+ return true;
+ } else {
+ return false; /* on valid oplock brk we get "request" */
+ }
+ }
+ if (pSMB->hdr.WordCount != 8)
+ return false;
+
+ cFYI(1, "oplock type 0x%d level 0x%d",
+ pSMB->LockType, pSMB->OplockLevel);
+ if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE))
+ return false;
+
+ /* look up tcon based on tid & uid */
+ spin_lock(&cifs_tcp_ses_lock);
+ list_for_each(tmp, &srv->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);
+ if (tcon->tid != buf->Tid)
+ continue;
+
+ cifs_stats_inc(&tcon->num_oplock_brks);
+ spin_lock(&cifs_file_list_lock);
+ list_for_each(tmp2, &tcon->openFileList) {
+ netfile = list_entry(tmp2, struct cifsFileInfo,
+ tlist);
+ if (pSMB->Fid != netfile->netfid)
+ continue;
+
+ cFYI(1, "file id match, oplock break");
+ pCifsInode = CIFS_I(netfile->dentry->d_inode);
+
+ cifs_set_oplock_level(pCifsInode,
+ pSMB->OplockLevel ? OPLOCK_READ : 0);
+ queue_work(cifsiod_wq,
+ &netfile->oplock_break);
+ netfile->oplock_break_cancelled = false;
+
+ 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 true;
+}
+
+void
+dump_smb(void *buf, int smb_buf_length)
+{
+ int i, j;
+ char debug_line[17];
+ unsigned char *buffer = buf;
+
+ if (traceSMB == 0)
+ return;
+
+ for (i = 0, j = 0; i < smb_buf_length; i++, j++) {
+ if (i % 8 == 0) {
+ /* have reached the beginning of line */
+ printk(KERN_DEBUG "| ");
+ j = 0;
+ }
+ printk("%0#4x ", buffer[i]);
+ debug_line[2 * j] = ' ';
+ if (isprint(buffer[i]))
+ debug_line[1 + (2 * j)] = buffer[i];
+ else
+ debug_line[1 + (2 * j)] = '_';
+
+ if (i % 8 == 7) {
+ /* reached end of line, time to print ascii */
+ debug_line[16] = 0;
+ printk(" | %s\n", debug_line);
+ }
+ }
+ for (; j < 8; j++) {
+ printk(" ");
+ debug_line[2 * j] = ' ';
+ debug_line[1 + (2 * j)] = ' ';
+ }
+ printk(" | %s\n", debug_line);
+ return;
+}
+
+void
+cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb)
+{
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
+ cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
+ cERROR(1, "Autodisabling the use of server inode numbers on "
+ "%s. This server doesn't seem to support them "
+ "properly. Hardlinks will not be recognized on this "
+ "mount. Consider mounting with the \"noserverino\" "
+ "option to silence this message.",
+ cifs_sb_master_tcon(cifs_sb)->treeName);
+ }
+}
+
+void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
+{
+ oplock &= 0xF;
+
+ if (oplock == OPLOCK_EXCLUSIVE) {
+ cinode->clientCanCacheAll = true;
+ cinode->clientCanCacheRead = true;
+ cFYI(1, "Exclusive Oplock granted on inode %p",
+ &cinode->vfs_inode);
+ } else if (oplock == OPLOCK_READ) {
+ cinode->clientCanCacheAll = false;
+ cinode->clientCanCacheRead = true;
+ cFYI(1, "Level II Oplock granted on inode %p",
+ &cinode->vfs_inode);
+ } else {
+ cinode->clientCanCacheAll = false;
+ cinode->clientCanCacheRead = false;
+ }
+}
+
+bool
+backup_cred(struct cifs_sb_info *cifs_sb)
+{
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) {
+ if (cifs_sb->mnt_backupuid == current_fsuid())
+ return true;
+ }
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) {
+ if (in_group_p(cifs_sb->mnt_backupgid))
+ return true;
+ }
+
+ return false;
+}
+
+void
+cifs_add_credits(struct TCP_Server_Info *server, const unsigned int add)
+{
+ spin_lock(&server->req_lock);
+ server->credits += add;
+ server->in_flight--;
+ spin_unlock(&server->req_lock);
+ wake_up(&server->request_q);
+}
+
+void
+cifs_set_credits(struct TCP_Server_Info *server, const int val)
+{
+ spin_lock(&server->req_lock);
+ server->credits = val;
+ server->oplocks = val > 1 ? enable_oplocks : false;
+ spin_unlock(&server->req_lock);
+}