+++ /dev/null
-// SPDX-License-Identifier: LGPL-2.1
-/*
- *
- * Copyright (C) International Business Machines Corp., 2002,2008
- * Author(s): Steve French (sfrench@us.ibm.com)
- *
- */
-
-#include <linux/slab.h>
-#include <linux/ctype.h>
-#include <linux/mempool.h>
-#include <linux/vmalloc.h>
-#include "cifspdu.h"
-#include "cifsglob.h"
-#include "cifsproto.h"
-#include "cifs_debug.h"
-#include "smberr.h"
-#include "nterr.h"
-#include "cifs_unicode.h"
-#include "smb2pdu.h"
-#include "cifsfs.h"
-#ifdef CONFIG_CIFS_DFS_UPCALL
-#include "dns_resolve.h"
-#include "dfs_cache.h"
-#include "dfs.h"
-#endif
-#include "fs_context.h"
-#include "cached_dir.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
-_get_xid(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)
- cifs_dbg(FYI, "warning: more than 65000 requests active\n");
- xid = GlobalCurrentXid++;
- spin_unlock(&GlobalMid_Lock);
- return xid;
-}
-
-void
-_free_xid(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);
- spin_lock_init(&ret_buf->ses_lock);
- ret_buf->ses_status = SES_NEW;
- ++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);
- spin_lock_init(&ret_buf->iface_lock);
- INIT_LIST_HEAD(&ret_buf->iface_list);
- spin_lock_init(&ret_buf->chan_lock);
- }
- return ret_buf;
-}
-
-void
-sesInfoFree(struct cifs_ses *buf_to_free)
-{
- struct cifs_server_iface *iface = NULL, *niface = NULL;
-
- if (buf_to_free == NULL) {
- cifs_dbg(FYI, "Null buffer passed to sesInfoFree\n");
- return;
- }
-
- atomic_dec(&sesInfoAllocCount);
- kfree(buf_to_free->serverOS);
- kfree(buf_to_free->serverDomain);
- kfree(buf_to_free->serverNOS);
- kfree_sensitive(buf_to_free->password);
- kfree(buf_to_free->user_name);
- kfree(buf_to_free->domainName);
- kfree_sensitive(buf_to_free->auth_key.response);
- spin_lock(&buf_to_free->iface_lock);
- list_for_each_entry_safe(iface, niface, &buf_to_free->iface_list,
- iface_head)
- kref_put(&iface->refcount, release_iface);
- spin_unlock(&buf_to_free->iface_lock);
- kfree_sensitive(buf_to_free);
-}
-
-struct cifs_tcon *
-tconInfoAlloc(void)
-{
- struct cifs_tcon *ret_buf;
-
- ret_buf = kzalloc(sizeof(*ret_buf), GFP_KERNEL);
- if (!ret_buf)
- return NULL;
- ret_buf->cfids = init_cached_dirs();
- if (!ret_buf->cfids) {
- kfree(ret_buf);
- return NULL;
- }
-
- atomic_inc(&tconInfoAllocCount);
- ret_buf->status = TID_NEW;
- ++ret_buf->tc_count;
- spin_lock_init(&ret_buf->tc_lock);
- INIT_LIST_HEAD(&ret_buf->openFileList);
- INIT_LIST_HEAD(&ret_buf->tcon_list);
- spin_lock_init(&ret_buf->open_file_lock);
- spin_lock_init(&ret_buf->stat_lock);
- atomic_set(&ret_buf->num_local_opens, 0);
- atomic_set(&ret_buf->num_remote_opens, 0);
-#ifdef CONFIG_CIFS_DFS_UPCALL
- INIT_LIST_HEAD(&ret_buf->dfs_ses_list);
-#endif
-
- return ret_buf;
-}
-
-void
-tconInfoFree(struct cifs_tcon *tcon)
-{
- if (tcon == NULL) {
- cifs_dbg(FYI, "Null buffer passed to tconInfoFree\n");
- return;
- }
- free_cached_dirs(tcon->cfids);
- atomic_dec(&tconInfoAllocCount);
- kfree(tcon->nativeFileSystem);
- kfree_sensitive(tcon->password);
-#ifdef CONFIG_CIFS_DFS_UPCALL
- dfs_put_root_smb_sessions(&tcon->dfs_ses_list);
-#endif
- kfree(tcon);
-}
-
-struct smb_hdr *
-cifs_buf_get(void)
-{
- struct smb_hdr *ret_buf = NULL;
- /*
- * SMB2 header is bigger than CIFS one - no problems to clean some
- * more bytes for CIFS.
- */
- size_t buf_size = sizeof(struct smb2_hdr);
-
- /*
- * 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 */
- memset(ret_buf, 0, buf_size + 3);
- atomic_inc(&buf_alloc_count);
-#ifdef CONFIG_CIFS_STATS2
- atomic_inc(&total_buf_alloc_count);
-#endif /* CONFIG_CIFS_STATS2 */
-
- return ret_buf;
-}
-
-void
-cifs_buf_release(void *buf_to_free)
-{
- if (buf_to_free == NULL) {
- /* cifs_dbg(FYI, "Null buffer passed to cifs_buf_release\n");*/
- return;
- }
- mempool_free(buf_to_free, cifs_req_poolp);
-
- atomic_dec(&buf_alloc_count);
- 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);
- /* No need to clear memory here, cleared in header assemble */
- /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
- atomic_inc(&small_buf_alloc_count);
-#ifdef CONFIG_CIFS_STATS2
- atomic_inc(&total_small_buf_alloc_count);
-#endif /* CONFIG_CIFS_STATS2 */
-
- return ret_buf;
-}
-
-void
-cifs_small_buf_release(void *buf_to_free)
-{
-
- if (buf_to_free == NULL) {
- cifs_dbg(FYI, "Null buffer passed to cifs_small_buf_release\n");
- return;
- }
- mempool_free(buf_to_free, cifs_sm_req_poolp);
-
- atomic_dec(&small_buf_alloc_count);
- return;
-}
-
-void
-free_rsp_buf(int resp_buftype, void *rsp)
-{
- if (resp_buftype == CIFS_SMALL_BUFFER)
- cifs_small_buf_release(rsp);
- else if (resp_buftype == CIFS_LARGE_BUFFER)
- cifs_buf_release(rsp);
-}
-
-/* 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 */)
-{
- 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;
- if (treeCon->ses->server)
- buffer->Mid = get_next_mid(treeCon->ses->server);
- }
- 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->sign)
- 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)
-{
- /* does it have the right SMB "signature" ? */
- if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) {
- cifs_dbg(VFS, "Bad protocol string signature header 0x%x\n",
- *(unsigned int *)smb->Protocol);
- 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;
-
- cifs_dbg(VFS, "Server sent request, not response. mid=%u\n",
- get_mid(smb));
- return 1;
-}
-
-int
-checkSMB(char *buf, unsigned int total_read, struct TCP_Server_Info *server)
-{
- struct smb_hdr *smb = (struct smb_hdr *)buf;
- __u32 rfclen = be32_to_cpu(smb->smb_buf_length);
- __u32 clc_len; /* calculated length */
- cifs_dbg(FYI, "checkSMB Length: 0x%x, smb_buf_length: 0x%x\n",
- 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;
- }
- cifs_dbg(VFS, "rcvd invalid byte count (bcc)\n");
- } else {
- cifs_dbg(VFS, "Length less than smb header size\n");
- }
- return -EIO;
- }
-
- /* otherwise, there is enough to get to the BCC */
- if (check_smb_hdr(smb))
- return -EIO;
- clc_len = smbCalcSize(smb);
-
- if (4 + rfclen != total_read) {
- cifs_dbg(VFS, "Length read does not match RFC1001 length %d\n",
- rfclen);
- return -EIO;
- }
-
- if (4 + rfclen != clc_len) {
- __u16 mid = get_mid(smb);
- /* 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 */
- }
- cifs_dbg(FYI, "Calculated size %u vs length %u mismatch for mid=%u\n",
- clc_len, 4 + rfclen, mid);
-
- if (4 + rfclen < clc_len) {
- cifs_dbg(VFS, "RFC1001 size %u smaller than SMB for mid=%u\n",
- rfclen, 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.
- */
- cifs_dbg(VFS, "RFC1001 size %u more than 512 bytes larger than SMB for mid=%u\n",
- rfclen, 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 TCP_Server_Info *pserver;
- struct cifs_ses *ses;
- struct cifs_tcon *tcon;
- struct cifsInodeInfo *pCifsInode;
- struct cifsFileInfo *netfile;
-
- cifs_dbg(FYI, "Checking for oplock break or dnotify response\n");
- 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;
- size_t len = srv->total_read - sizeof(pSMBr->hdr.smb_buf_length);
-
- if (get_bcc(buf) > sizeof(struct file_notify_information)) {
- data_offset = le32_to_cpu(pSMBr->DataOffset);
-
- if (data_offset >
- len - sizeof(struct file_notify_information)) {
- cifs_dbg(FYI, "Invalid data_offset %u\n",
- data_offset);
- return true;
- }
- pnotify = (struct file_notify_information *)
- ((char *)&pSMBr->hdr.Protocol + data_offset);
- cifs_dbg(FYI, "dnotify on %s Action: 0x%x\n",
- pnotify->FileName, pnotify->Action);
- /* cifs_dump_mem("Rcvd notify Data: ",buf,
- sizeof(struct smb_hdr)+60); */
- return true;
- }
- if (pSMBr->hdr.Status.CifsError) {
- cifs_dbg(FYI, "notify err 0x%x\n",
- 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)) {
- cifs_dbg(FYI, "Invalid handle on oplock break\n");
- 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;
-
- cifs_dbg(FYI, "oplock type 0x%x level 0x%x\n",
- pSMB->LockType, pSMB->OplockLevel);
- if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE))
- return false;
-
- /* If server is a channel, select the primary channel */
- pserver = CIFS_SERVER_IS_CHAN(srv) ? srv->primary_server : srv;
-
- /* look up tcon based on tid & uid */
- spin_lock(&cifs_tcp_ses_lock);
- list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
- list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
- if (tcon->tid != buf->Tid)
- continue;
-
- cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
- spin_lock(&tcon->open_file_lock);
- list_for_each_entry(netfile, &tcon->openFileList, tlist) {
- if (pSMB->Fid != netfile->fid.netfid)
- continue;
-
- cifs_dbg(FYI, "file id match, oplock break\n");
- pCifsInode = CIFS_I(d_inode(netfile->dentry));
-
- set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
- &pCifsInode->flags);
-
- netfile->oplock_epoch = 0;
- netfile->oplock_level = pSMB->OplockLevel;
- netfile->oplock_break_cancelled = false;
- cifs_queue_oplock_break(netfile);
-
- spin_unlock(&tcon->open_file_lock);
- spin_unlock(&cifs_tcp_ses_lock);
- return true;
- }
- spin_unlock(&tcon->open_file_lock);
- spin_unlock(&cifs_tcp_ses_lock);
- cifs_dbg(FYI, "No matching file for oplock break\n");
- return true;
- }
- }
- spin_unlock(&cifs_tcp_ses_lock);
- cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n");
- return true;
-}
-
-void
-dump_smb(void *buf, int smb_buf_length)
-{
- if (traceSMB == 0)
- return;
-
- print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, 8, 2, buf,
- smb_buf_length, true);
-}
-
-void
-cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb)
-{
- if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
- struct cifs_tcon *tcon = NULL;
-
- if (cifs_sb->master_tlink)
- tcon = cifs_sb_master_tcon(cifs_sb);
-
- cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
- cifs_sb->mnt_cifs_serverino_autodisabled = true;
- cifs_dbg(VFS, "Autodisabling the use of server inode numbers on %s\n",
- tcon ? tcon->tree_name : "new server");
- cifs_dbg(VFS, "The server doesn't seem to support them properly or the files might be on different servers (DFS)\n");
- cifs_dbg(VFS, "Hardlinks will not be recognized on this mount. Consider mounting with the \"noserverino\" option to silence this message.\n");
-
- }
-}
-
-void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
-{
- oplock &= 0xF;
-
- if (oplock == OPLOCK_EXCLUSIVE) {
- cinode->oplock = CIFS_CACHE_WRITE_FLG | CIFS_CACHE_READ_FLG;
- cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
- &cinode->netfs.inode);
- } else if (oplock == OPLOCK_READ) {
- cinode->oplock = CIFS_CACHE_READ_FLG;
- cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
- &cinode->netfs.inode);
- } else
- cinode->oplock = 0;
-}
-
-/*
- * We wait for oplock breaks to be processed before we attempt to perform
- * writes.
- */
-int cifs_get_writer(struct cifsInodeInfo *cinode)
-{
- int rc;
-
-start:
- rc = wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK,
- TASK_KILLABLE);
- if (rc)
- return rc;
-
- spin_lock(&cinode->writers_lock);
- if (!cinode->writers)
- set_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
- cinode->writers++;
- /* Check to see if we have started servicing an oplock break */
- if (test_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags)) {
- cinode->writers--;
- if (cinode->writers == 0) {
- clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
- wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS);
- }
- spin_unlock(&cinode->writers_lock);
- goto start;
- }
- spin_unlock(&cinode->writers_lock);
- return 0;
-}
-
-void cifs_put_writer(struct cifsInodeInfo *cinode)
-{
- spin_lock(&cinode->writers_lock);
- cinode->writers--;
- if (cinode->writers == 0) {
- clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
- wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS);
- }
- spin_unlock(&cinode->writers_lock);
-}
-
-/**
- * cifs_queue_oplock_break - queue the oplock break handler for cfile
- * @cfile: The file to break the oplock on
- *
- * This function is called from the demultiplex thread when it
- * receives an oplock break for @cfile.
- *
- * Assumes the tcon->open_file_lock is held.
- * Assumes cfile->file_info_lock is NOT held.
- */
-void cifs_queue_oplock_break(struct cifsFileInfo *cfile)
-{
- /*
- * Bump the handle refcount now while we hold the
- * open_file_lock to enforce the validity of it for the oplock
- * break handler. The matching put is done at the end of the
- * handler.
- */
- cifsFileInfo_get(cfile);
-
- queue_work(cifsoplockd_wq, &cfile->oplock_break);
-}
-
-void cifs_done_oplock_break(struct cifsInodeInfo *cinode)
-{
- clear_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags);
- wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK);
-}
-
-bool
-backup_cred(struct cifs_sb_info *cifs_sb)
-{
- if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) {
- if (uid_eq(cifs_sb->ctx->backupuid, current_fsuid()))
- return true;
- }
- if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) {
- if (in_group_p(cifs_sb->ctx->backupgid))
- return true;
- }
-
- return false;
-}
-
-void
-cifs_del_pending_open(struct cifs_pending_open *open)
-{
- spin_lock(&tlink_tcon(open->tlink)->open_file_lock);
- list_del(&open->olist);
- spin_unlock(&tlink_tcon(open->tlink)->open_file_lock);
-}
-
-void
-cifs_add_pending_open_locked(struct cifs_fid *fid, struct tcon_link *tlink,
- struct cifs_pending_open *open)
-{
- memcpy(open->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
- open->oplock = CIFS_OPLOCK_NO_CHANGE;
- open->tlink = tlink;
- fid->pending_open = open;
- list_add_tail(&open->olist, &tlink_tcon(tlink)->pending_opens);
-}
-
-void
-cifs_add_pending_open(struct cifs_fid *fid, struct tcon_link *tlink,
- struct cifs_pending_open *open)
-{
- spin_lock(&tlink_tcon(tlink)->open_file_lock);
- cifs_add_pending_open_locked(fid, tlink, open);
- spin_unlock(&tlink_tcon(open->tlink)->open_file_lock);
-}
-
-/*
- * Critical section which runs after acquiring deferred_lock.
- * As there is no reference count on cifs_deferred_close, pdclose
- * should not be used outside deferred_lock.
- */
-bool
-cifs_is_deferred_close(struct cifsFileInfo *cfile, struct cifs_deferred_close **pdclose)
-{
- struct cifs_deferred_close *dclose;
-
- list_for_each_entry(dclose, &CIFS_I(d_inode(cfile->dentry))->deferred_closes, dlist) {
- if ((dclose->netfid == cfile->fid.netfid) &&
- (dclose->persistent_fid == cfile->fid.persistent_fid) &&
- (dclose->volatile_fid == cfile->fid.volatile_fid)) {
- *pdclose = dclose;
- return true;
- }
- }
- return false;
-}
-
-/*
- * Critical section which runs after acquiring deferred_lock.
- */
-void
-cifs_add_deferred_close(struct cifsFileInfo *cfile, struct cifs_deferred_close *dclose)
-{
- bool is_deferred = false;
- struct cifs_deferred_close *pdclose;
-
- is_deferred = cifs_is_deferred_close(cfile, &pdclose);
- if (is_deferred) {
- kfree(dclose);
- return;
- }
-
- dclose->tlink = cfile->tlink;
- dclose->netfid = cfile->fid.netfid;
- dclose->persistent_fid = cfile->fid.persistent_fid;
- dclose->volatile_fid = cfile->fid.volatile_fid;
- list_add_tail(&dclose->dlist, &CIFS_I(d_inode(cfile->dentry))->deferred_closes);
-}
-
-/*
- * Critical section which runs after acquiring deferred_lock.
- */
-void
-cifs_del_deferred_close(struct cifsFileInfo *cfile)
-{
- bool is_deferred = false;
- struct cifs_deferred_close *dclose;
-
- is_deferred = cifs_is_deferred_close(cfile, &dclose);
- if (!is_deferred)
- return;
- list_del(&dclose->dlist);
- kfree(dclose);
-}
-
-void
-cifs_close_deferred_file(struct cifsInodeInfo *cifs_inode)
-{
- struct cifsFileInfo *cfile = NULL;
- struct file_list *tmp_list, *tmp_next_list;
- struct list_head file_head;
-
- if (cifs_inode == NULL)
- return;
-
- INIT_LIST_HEAD(&file_head);
- spin_lock(&cifs_inode->open_file_lock);
- list_for_each_entry(cfile, &cifs_inode->openFileList, flist) {
- if (delayed_work_pending(&cfile->deferred)) {
- if (cancel_delayed_work(&cfile->deferred)) {
- spin_lock(&cifs_inode->deferred_lock);
- cifs_del_deferred_close(cfile);
- spin_unlock(&cifs_inode->deferred_lock);
-
- tmp_list = kmalloc(sizeof(struct file_list), GFP_ATOMIC);
- if (tmp_list == NULL)
- break;
- tmp_list->cfile = cfile;
- list_add_tail(&tmp_list->list, &file_head);
- }
- }
- }
- spin_unlock(&cifs_inode->open_file_lock);
-
- list_for_each_entry_safe(tmp_list, tmp_next_list, &file_head, list) {
- _cifsFileInfo_put(tmp_list->cfile, false, false);
- list_del(&tmp_list->list);
- kfree(tmp_list);
- }
-}
-
-void
-cifs_close_all_deferred_files(struct cifs_tcon *tcon)
-{
- struct cifsFileInfo *cfile;
- struct file_list *tmp_list, *tmp_next_list;
- struct list_head file_head;
-
- INIT_LIST_HEAD(&file_head);
- spin_lock(&tcon->open_file_lock);
- list_for_each_entry(cfile, &tcon->openFileList, tlist) {
- if (delayed_work_pending(&cfile->deferred)) {
- if (cancel_delayed_work(&cfile->deferred)) {
- spin_lock(&CIFS_I(d_inode(cfile->dentry))->deferred_lock);
- cifs_del_deferred_close(cfile);
- spin_unlock(&CIFS_I(d_inode(cfile->dentry))->deferred_lock);
-
- tmp_list = kmalloc(sizeof(struct file_list), GFP_ATOMIC);
- if (tmp_list == NULL)
- break;
- tmp_list->cfile = cfile;
- list_add_tail(&tmp_list->list, &file_head);
- }
- }
- }
- spin_unlock(&tcon->open_file_lock);
-
- list_for_each_entry_safe(tmp_list, tmp_next_list, &file_head, list) {
- _cifsFileInfo_put(tmp_list->cfile, true, false);
- list_del(&tmp_list->list);
- kfree(tmp_list);
- }
-}
-void
-cifs_close_deferred_file_under_dentry(struct cifs_tcon *tcon, const char *path)
-{
- struct cifsFileInfo *cfile;
- struct file_list *tmp_list, *tmp_next_list;
- struct list_head file_head;
- void *page;
- const char *full_path;
-
- INIT_LIST_HEAD(&file_head);
- page = alloc_dentry_path();
- spin_lock(&tcon->open_file_lock);
- list_for_each_entry(cfile, &tcon->openFileList, tlist) {
- full_path = build_path_from_dentry(cfile->dentry, page);
- if (strstr(full_path, path)) {
- if (delayed_work_pending(&cfile->deferred)) {
- if (cancel_delayed_work(&cfile->deferred)) {
- spin_lock(&CIFS_I(d_inode(cfile->dentry))->deferred_lock);
- cifs_del_deferred_close(cfile);
- spin_unlock(&CIFS_I(d_inode(cfile->dentry))->deferred_lock);
-
- tmp_list = kmalloc(sizeof(struct file_list), GFP_ATOMIC);
- if (tmp_list == NULL)
- break;
- tmp_list->cfile = cfile;
- list_add_tail(&tmp_list->list, &file_head);
- }
- }
- }
- }
- spin_unlock(&tcon->open_file_lock);
-
- list_for_each_entry_safe(tmp_list, tmp_next_list, &file_head, list) {
- _cifsFileInfo_put(tmp_list->cfile, true, false);
- list_del(&tmp_list->list);
- kfree(tmp_list);
- }
- free_dentry_path(page);
-}
-
-/* parses DFS referral V3 structure
- * caller is responsible for freeing target_nodes
- * returns:
- * - on success - 0
- * - on failure - errno
- */
-int
-parse_dfs_referrals(struct get_dfs_referral_rsp *rsp, u32 rsp_size,
- unsigned int *num_of_nodes,
- struct dfs_info3_param **target_nodes,
- const struct nls_table *nls_codepage, int remap,
- const char *searchName, bool is_unicode)
-{
- int i, rc = 0;
- char *data_end;
- struct dfs_referral_level_3 *ref;
-
- *num_of_nodes = le16_to_cpu(rsp->NumberOfReferrals);
-
- if (*num_of_nodes < 1) {
- cifs_dbg(VFS, "num_referrals: must be at least > 0, but we get num_referrals = %d\n",
- *num_of_nodes);
- rc = -EINVAL;
- goto parse_DFS_referrals_exit;
- }
-
- ref = (struct dfs_referral_level_3 *) &(rsp->referrals);
- if (ref->VersionNumber != cpu_to_le16(3)) {
- cifs_dbg(VFS, "Referrals of V%d version are not supported, should be V3\n",
- le16_to_cpu(ref->VersionNumber));
- rc = -EINVAL;
- goto parse_DFS_referrals_exit;
- }
-
- /* get the upper boundary of the resp buffer */
- data_end = (char *)rsp + rsp_size;
-
- cifs_dbg(FYI, "num_referrals: %d dfs flags: 0x%x ...\n",
- *num_of_nodes, le32_to_cpu(rsp->DFSFlags));
-
- *target_nodes = kcalloc(*num_of_nodes, sizeof(struct dfs_info3_param),
- GFP_KERNEL);
- if (*target_nodes == NULL) {
- rc = -ENOMEM;
- goto parse_DFS_referrals_exit;
- }
-
- /* collect necessary data from referrals */
- for (i = 0; i < *num_of_nodes; i++) {
- char *temp;
- int max_len;
- struct dfs_info3_param *node = (*target_nodes)+i;
-
- node->flags = le32_to_cpu(rsp->DFSFlags);
- if (is_unicode) {
- __le16 *tmp = kmalloc(strlen(searchName)*2 + 2,
- GFP_KERNEL);
- if (tmp == NULL) {
- rc = -ENOMEM;
- goto parse_DFS_referrals_exit;
- }
- cifsConvertToUTF16((__le16 *) tmp, searchName,
- PATH_MAX, nls_codepage, remap);
- node->path_consumed = cifs_utf16_bytes(tmp,
- le16_to_cpu(rsp->PathConsumed),
- nls_codepage);
- kfree(tmp);
- } else
- node->path_consumed = le16_to_cpu(rsp->PathConsumed);
-
- node->server_type = le16_to_cpu(ref->ServerType);
- node->ref_flag = le16_to_cpu(ref->ReferralEntryFlags);
-
- /* copy DfsPath */
- temp = (char *)ref + le16_to_cpu(ref->DfsPathOffset);
- max_len = data_end - temp;
- node->path_name = cifs_strndup_from_utf16(temp, max_len,
- is_unicode, nls_codepage);
- if (!node->path_name) {
- rc = -ENOMEM;
- goto parse_DFS_referrals_exit;
- }
-
- /* copy link target UNC */
- temp = (char *)ref + le16_to_cpu(ref->NetworkAddressOffset);
- max_len = data_end - temp;
- node->node_name = cifs_strndup_from_utf16(temp, max_len,
- is_unicode, nls_codepage);
- if (!node->node_name) {
- rc = -ENOMEM;
- goto parse_DFS_referrals_exit;
- }
-
- node->ttl = le32_to_cpu(ref->TimeToLive);
-
- ref++;
- }
-
-parse_DFS_referrals_exit:
- if (rc) {
- free_dfs_info_array(*target_nodes, *num_of_nodes);
- *target_nodes = NULL;
- *num_of_nodes = 0;
- }
- return rc;
-}
-
-struct cifs_aio_ctx *
-cifs_aio_ctx_alloc(void)
-{
- struct cifs_aio_ctx *ctx;
-
- /*
- * Must use kzalloc to initialize ctx->bv to NULL and ctx->direct_io
- * to false so that we know when we have to unreference pages within
- * cifs_aio_ctx_release()
- */
- ctx = kzalloc(sizeof(struct cifs_aio_ctx), GFP_KERNEL);
- if (!ctx)
- return NULL;
-
- INIT_LIST_HEAD(&ctx->list);
- mutex_init(&ctx->aio_mutex);
- init_completion(&ctx->done);
- kref_init(&ctx->refcount);
- return ctx;
-}
-
-void
-cifs_aio_ctx_release(struct kref *refcount)
-{
- struct cifs_aio_ctx *ctx = container_of(refcount,
- struct cifs_aio_ctx, refcount);
-
- cifsFileInfo_put(ctx->cfile);
-
- /*
- * ctx->bv is only set if setup_aio_ctx_iter() was call successfuly
- * which means that iov_iter_extract_pages() was a success and thus
- * that we may have references or pins on pages that we need to
- * release.
- */
- if (ctx->bv) {
- if (ctx->should_dirty || ctx->bv_need_unpin) {
- unsigned int i;
-
- for (i = 0; i < ctx->nr_pinned_pages; i++) {
- struct page *page = ctx->bv[i].bv_page;
-
- if (ctx->should_dirty)
- set_page_dirty(page);
- if (ctx->bv_need_unpin)
- unpin_user_page(page);
- }
- }
- kvfree(ctx->bv);
- }
-
- kfree(ctx);
-}
-
-/**
- * cifs_alloc_hash - allocate hash and hash context together
- * @name: The name of the crypto hash algo
- * @sdesc: SHASH descriptor where to put the pointer to the hash TFM
- *
- * The caller has to make sure @sdesc is initialized to either NULL or
- * a valid context. It can be freed via cifs_free_hash().
- */
-int
-cifs_alloc_hash(const char *name, struct shash_desc **sdesc)
-{
- int rc = 0;
- struct crypto_shash *alg = NULL;
-
- if (*sdesc)
- return 0;
-
- alg = crypto_alloc_shash(name, 0, 0);
- if (IS_ERR(alg)) {
- cifs_dbg(VFS, "Could not allocate shash TFM '%s'\n", name);
- rc = PTR_ERR(alg);
- *sdesc = NULL;
- return rc;
- }
-
- *sdesc = kmalloc(sizeof(struct shash_desc) + crypto_shash_descsize(alg), GFP_KERNEL);
- if (*sdesc == NULL) {
- cifs_dbg(VFS, "no memory left to allocate shash TFM '%s'\n", name);
- crypto_free_shash(alg);
- return -ENOMEM;
- }
-
- (*sdesc)->tfm = alg;
- return 0;
-}
-
-/**
- * cifs_free_hash - free hash and hash context together
- * @sdesc: Where to find the pointer to the hash TFM
- *
- * Freeing a NULL descriptor is safe.
- */
-void
-cifs_free_hash(struct shash_desc **sdesc)
-{
- if (unlikely(!sdesc) || !*sdesc)
- return;
-
- if ((*sdesc)->tfm) {
- crypto_free_shash((*sdesc)->tfm);
- (*sdesc)->tfm = NULL;
- }
-
- kfree_sensitive(*sdesc);
- *sdesc = NULL;
-}
-
-void extract_unc_hostname(const char *unc, const char **h, size_t *len)
-{
- const char *end;
-
- /* skip initial slashes */
- while (*unc && (*unc == '\\' || *unc == '/'))
- unc++;
-
- end = unc;
-
- while (*end && !(*end == '\\' || *end == '/'))
- end++;
-
- *h = unc;
- *len = end - unc;
-}
-
-/**
- * copy_path_name - copy src path to dst, possibly truncating
- * @dst: The destination buffer
- * @src: The source name
- *
- * returns number of bytes written (including trailing nul)
- */
-int copy_path_name(char *dst, const char *src)
-{
- int name_len;
-
- /*
- * PATH_MAX includes nul, so if strlen(src) >= PATH_MAX it
- * will truncate and strlen(dst) will be PATH_MAX-1
- */
- name_len = strscpy(dst, src, PATH_MAX);
- if (WARN_ON_ONCE(name_len < 0))
- name_len = PATH_MAX-1;
-
- /* we count the trailing nul */
- name_len++;
- return name_len;
-}
-
-struct super_cb_data {
- void *data;
- struct super_block *sb;
-};
-
-static void tcp_super_cb(struct super_block *sb, void *arg)
-{
- struct super_cb_data *sd = arg;
- struct TCP_Server_Info *server = sd->data;
- struct cifs_sb_info *cifs_sb;
- struct cifs_tcon *tcon;
-
- if (sd->sb)
- return;
-
- cifs_sb = CIFS_SB(sb);
- tcon = cifs_sb_master_tcon(cifs_sb);
- if (tcon->ses->server == server)
- sd->sb = sb;
-}
-
-static struct super_block *__cifs_get_super(void (*f)(struct super_block *, void *),
- void *data)
-{
- struct super_cb_data sd = {
- .data = data,
- .sb = NULL,
- };
- struct file_system_type **fs_type = (struct file_system_type *[]) {
- &cifs_fs_type, &smb3_fs_type, NULL,
- };
-
- for (; *fs_type; fs_type++) {
- iterate_supers_type(*fs_type, f, &sd);
- if (sd.sb) {
- /*
- * Grab an active reference in order to prevent automounts (DFS links)
- * of expiring and then freeing up our cifs superblock pointer while
- * we're doing failover.
- */
- cifs_sb_active(sd.sb);
- return sd.sb;
- }
- }
- return ERR_PTR(-EINVAL);
-}
-
-static void __cifs_put_super(struct super_block *sb)
-{
- if (!IS_ERR_OR_NULL(sb))
- cifs_sb_deactive(sb);
-}
-
-struct super_block *cifs_get_tcp_super(struct TCP_Server_Info *server)
-{
- return __cifs_get_super(tcp_super_cb, server);
-}
-
-void cifs_put_tcp_super(struct super_block *sb)
-{
- __cifs_put_super(sb);
-}
-
-#ifdef CONFIG_CIFS_DFS_UPCALL
-int match_target_ip(struct TCP_Server_Info *server,
- const char *share, size_t share_len,
- bool *result)
-{
- int rc;
- char *target;
- struct sockaddr_storage ss;
-
- *result = false;
-
- target = kzalloc(share_len + 3, GFP_KERNEL);
- if (!target)
- return -ENOMEM;
-
- scnprintf(target, share_len + 3, "\\\\%.*s", (int)share_len, share);
-
- cifs_dbg(FYI, "%s: target name: %s\n", __func__, target + 2);
-
- rc = dns_resolve_server_name_to_ip(target, (struct sockaddr *)&ss, NULL);
- kfree(target);
-
- if (rc < 0)
- return rc;
-
- spin_lock(&server->srv_lock);
- *result = cifs_match_ipaddr((struct sockaddr *)&server->dstaddr, (struct sockaddr *)&ss);
- spin_unlock(&server->srv_lock);
- cifs_dbg(FYI, "%s: ip addresses match: %u\n", __func__, *result);
- return 0;
-}
-
-int cifs_update_super_prepath(struct cifs_sb_info *cifs_sb, char *prefix)
-{
- kfree(cifs_sb->prepath);
-
- if (prefix && *prefix) {
- cifs_sb->prepath = cifs_sanitize_prepath(prefix, GFP_ATOMIC);
- if (!cifs_sb->prepath)
- return -ENOMEM;
-
- convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
- } else
- cifs_sb->prepath = NULL;
-
- cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
- return 0;
-}
-
-/*
- * Handle weird Windows SMB server behaviour. It responds with
- * STATUS_OBJECT_NAME_INVALID code to SMB2 QUERY_INFO request for
- * "\<server>\<dfsname>\<linkpath>" DFS reference, where <dfsname> contains
- * non-ASCII unicode symbols.
- */
-int cifs_inval_name_dfs_link_error(const unsigned int xid,
- struct cifs_tcon *tcon,
- struct cifs_sb_info *cifs_sb,
- const char *full_path,
- bool *islink)
-{
- struct cifs_ses *ses = tcon->ses;
- size_t len;
- char *path;
- char *ref_path;
-
- *islink = false;
-
- /*
- * Fast path - skip check when @full_path doesn't have a prefix path to
- * look up or tcon is not DFS.
- */
- if (strlen(full_path) < 2 || !cifs_sb ||
- (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS) ||
- !is_tcon_dfs(tcon) || !ses->server->origin_fullpath)
- return 0;
-
- /*
- * Slow path - tcon is DFS and @full_path has prefix path, so attempt
- * to get a referral to figure out whether it is an DFS link.
- */
- len = strnlen(tcon->tree_name, MAX_TREE_SIZE + 1) + strlen(full_path) + 1;
- path = kmalloc(len, GFP_KERNEL);
- if (!path)
- return -ENOMEM;
-
- scnprintf(path, len, "%s%s", tcon->tree_name, full_path);
- ref_path = dfs_cache_canonical_path(path + 1, cifs_sb->local_nls,
- cifs_remap(cifs_sb));
- kfree(path);
-
- if (IS_ERR(ref_path)) {
- if (PTR_ERR(ref_path) != -EINVAL)
- return PTR_ERR(ref_path);
- } else {
- struct dfs_info3_param *refs = NULL;
- int num_refs = 0;
-
- /*
- * XXX: we are not using dfs_cache_find() here because we might
- * end filling all the DFS cache and thus potentially
- * removing cached DFS targets that the client would eventually
- * need during failover.
- */
- ses = CIFS_DFS_ROOT_SES(ses);
- if (ses->server->ops->get_dfs_refer &&
- !ses->server->ops->get_dfs_refer(xid, ses, ref_path, &refs,
- &num_refs, cifs_sb->local_nls,
- cifs_remap(cifs_sb)))
- *islink = refs[0].server_type == DFS_TYPE_LINK;
- free_dfs_info_array(refs, num_refs);
- kfree(ref_path);
- }
- return 0;
-}
-#endif
-
-int cifs_wait_for_server_reconnect(struct TCP_Server_Info *server, bool retry)
-{
- int timeout = 10;
- int rc;
-
- spin_lock(&server->srv_lock);
- if (server->tcpStatus != CifsNeedReconnect) {
- spin_unlock(&server->srv_lock);
- return 0;
- }
- timeout *= server->nr_targets;
- spin_unlock(&server->srv_lock);
-
- /*
- * Give demultiplex thread up to 10 seconds to each target available for
- * reconnect -- should be greater than cifs socket timeout which is 7
- * seconds.
- *
- * On "soft" mounts we wait once. Hard mounts keep retrying until
- * process is killed or server comes back on-line.
- */
- do {
- rc = wait_event_interruptible_timeout(server->response_q,
- (server->tcpStatus != CifsNeedReconnect),
- timeout * HZ);
- if (rc < 0) {
- cifs_dbg(FYI, "%s: aborting reconnect due to received signal\n",
- __func__);
- return -ERESTARTSYS;
- }
-
- /* are we still trying to reconnect? */
- spin_lock(&server->srv_lock);
- if (server->tcpStatus != CifsNeedReconnect) {
- spin_unlock(&server->srv_lock);
- return 0;
- }
- spin_unlock(&server->srv_lock);
- } while (retry);
-
- cifs_dbg(FYI, "%s: gave up waiting on reconnect\n", __func__);
- return -EHOSTDOWN;
-}
projects / linux-2.6-microblaze.git / blobdiff