// SPDX-License-Identifier: GPL-2.0-only
/*
* SMB1 (CIFS) version specific operations
*
* Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
*/
#include <linux/pagemap.h>
#include <linux/vfs.h>
#include <linux/fs_struct.h>
#include <uapi/linux/magic.h>
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifs_unicode.h"
#include "fs_context.h"
#include "nterr.h"
#include "smberr.h"
#include "reparse.h"
void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
{
/*
* If we are reconnecting then should we check to see if
* any requested capabilities changed locally e.g. via
* remount but we can not do much about it here
* if they have (even if we could detect it by the following)
* Perhaps we could add a backpointer to array of sb from tcon
* or if we change to make all sb to same share the same
* sb as NFS - then we only have one backpointer to sb.
* What if we wanted to mount the server share twice once with
* and once without posixacls or posix paths?
*/
__u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
if (ctx && ctx->no_linux_ext) {
tcon->fsUnixInfo.Capability = 0;
tcon->unix_ext = 0; /* Unix Extensions disabled */
cifs_dbg(FYI, "Linux protocol extensions disabled\n");
return;
} else if (ctx)
tcon->unix_ext = 1; /* Unix Extensions supported */
if (!tcon->unix_ext) {
cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
return;
}
if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
__u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
/*
* check for reconnect case in which we do not
* want to change the mount behavior if we can avoid it
*/
if (ctx == NULL) {
/*
* turn off POSIX ACL and PATHNAMES if not set
* originally at mount time
*/
if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
cifs_dbg(VFS, "POSIXPATH support change\n");
cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
} else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
cifs_dbg(VFS, "possible reconnect error\n");
cifs_dbg(VFS, "server disabled POSIX path support\n");
}
}
if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
cifs_dbg(VFS, "per-share encryption not supported yet\n");
cap &= CIFS_UNIX_CAP_MASK;
if (ctx && ctx->no_psx_acl)
cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
cifs_dbg(FYI, "negotiated posix acl support\n");
if (cifs_sb) {
atomic_or(CIFS_MOUNT_POSIXACL,
&cifs_sb->mnt_cifs_flags);
}
}
if (ctx && ctx->posix_paths == 0)
cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
cifs_dbg(FYI, "negotiate posix pathnames\n");
if (cifs_sb) {
atomic_or(CIFS_MOUNT_POSIX_PATHS,
&cifs_sb->mnt_cifs_flags);
}
}
cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
#ifdef CONFIG_CIFS_DEBUG2
if (cap & CIFS_UNIX_FCNTL_CAP)
cifs_dbg(FYI, "FCNTL cap\n");
if (cap & CIFS_UNIX_EXTATTR_CAP)
cifs_dbg(FYI, "EXTATTR cap\n");
if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
cifs_dbg(FYI, "POSIX path cap\n");
if (cap & CIFS_UNIX_XATTR_CAP)
cifs_dbg(FYI, "XATTR cap\n");
if (cap & CIFS_UNIX_POSIX_ACL_CAP)
cifs_dbg(FYI, "POSIX ACL cap\n");
if (cap & CIFS_UNIX_LARGE_READ_CAP)
cifs_dbg(FYI, "very large read cap\n");
if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
cifs_dbg(FYI, "very large write cap\n");
if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
cifs_dbg(FYI, "transport encryption cap\n");
if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
cifs_dbg(FYI, "mandatory transport encryption cap\n");
#endif /* CIFS_DEBUG2 */
if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
if (ctx == NULL)
cifs_dbg(FYI, "resetting capabilities failed\n");
else
cifs_dbg(VFS, "Negotiating Unix capabilities with the server failed. Consider mounting with the Unix Extensions disabled if problems are found by specifying the nounix mount option.\n");
}
}
}
/*
* An NT cancel request header looks just like the original request except:
*
* The Command is SMB_COM_NT_CANCEL
* The WordCount is zeroed out
* The ByteCount is zeroed out
*
* This function mangles an existing request buffer into a
* SMB_COM_NT_CANCEL request and then sends it.
*/
static int
send_nt_cancel(struct cifs_ses *ses, struct TCP_Server_Info *server,
struct smb_rqst *rqst, struct mid_q_entry *mid,
unsigned int xid)
{
struct smb_hdr *in_buf = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
struct kvec iov[1];
struct smb_rqst crqst = { .rq_iov = iov, .rq_nvec = 1 };
int rc = 0;
/* +2 for BCC field */
in_buf->Command = SMB_COM_NT_CANCEL;
in_buf->WordCount = 0;
put_bcc(0, in_buf);
iov[0].iov_base = in_buf;
iov[0].iov_len = sizeof(struct smb_hdr) + 2;
cifs_server_lock(server);
rc = cifs_sign_rqst(&crqst, server, &mid->sequence_number);
if (rc) {
cifs_server_unlock(server);
return rc;
}
/*
* The response to this call was already factored into the sequence
* number when the call went out, so we must adjust it back downward
* after signing here.
*/
--server->sequence_number;
rc = __smb_send_rqst(server, 1, &crqst);
if (rc < 0)
server->sequence_number--;
cifs_server_unlock(server);
cifs_dbg(FYI, "issued NT_CANCEL for mid %u, rc = %d\n",
get_mid(in_buf), rc);
return rc;
}
/*
* Send a LOCKINGX_CANCEL_LOCK to cause the Windows blocking lock to
* return.
*/
static int
send_lock_cancel(struct cifs_ses *ses, struct TCP_Server_Info *server,
struct smb_rqst *rqst, struct mid_q_entry *mid,
unsigned int xid)
{
struct smb_hdr *in_buf = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
unsigned int in_len = rqst->rq_iov[0].iov_len;
LOCK_REQ *pSMB = (LOCK_REQ *)in_buf;
int rc;
/* We just modify the current in_buf to change
* the type of lock from LOCKING_ANDX_SHARED_LOCK
* or LOCKING_ANDX_EXCLUSIVE_LOCK to
* LOCKING_ANDX_CANCEL_LOCK.
*/
pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES;
pSMB->Timeout = 0;
pSMB->hdr.Mid = get_next_mid(ses->server);
rc = SendReceive(xid, ses, in_buf, in_len, NULL, NULL, 0);
if (rc == -ENOLCK)
rc = 0; /* If we get back -ENOLCK, it probably means we managed
* to cancel the lock command before it took effect.
*/
return rc;
}
static int cifs_send_cancel(struct cifs_ses *ses, struct TCP_Server_Info *server,
struct smb_rqst *rqst, struct mid_q_entry *mid,
unsigned int xid)
{
if (mid->sr_flags & CIFS_WINDOWS_LOCK)
return send_lock_cancel(ses, server, rqst, mid, xid);
return send_nt_cancel(ses, server, rqst, mid, xid);
}
static bool
cifs_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
{
return ob1->fid.netfid == ob2->fid.netfid;
}
static unsigned int
cifs_read_data_offset(char *buf)
{
READ_RSP *rsp = (READ_RSP *)buf;
return le16_to_cpu(rsp->DataOffset);
}
static unsigned int
cifs_read_data_length(char *buf, bool in_remaining)
{
READ_RSP *rsp = (READ_RSP *)buf;
/* It's a bug reading remaining data for SMB1 packets */
WARN_ON(in_remaining);
return (le16_to_cpu(rsp->DataLengthHigh) << 16) +
le16_to_cpu(rsp->DataLength);
}
static struct mid_q_entry *
cifs_find_mid(struct TCP_Server_Info *server, char *buffer)
{
struct smb_hdr *buf = (struct smb_hdr *)buffer;
struct mid_q_entry *mid;
spin_lock(&server->mid_queue_lock);
list_for_each_entry(mid, &server->pending_mid_q, qhead) {
if (compare_mid(mid->mid, buf) &&
mid->mid_state == MID_REQUEST_SUBMITTED &&
le16_to_cpu(mid->command) == buf->Command) {
smb_get_mid(mid);
spin_unlock(&server->mid_queue_lock);
return mid;
}
}
spin_unlock(&server->mid_queue_lock);
return NULL;
}
static void
cifs_add_credits(struct TCP_Server_Info *server,
struct cifs_credits *credits, const int optype)
{
spin_lock(&server->req_lock);
server->credits += credits->value;
server->in_flight--;
spin_unlock(&server->req_lock);
wake_up(&server->request_q);
}
static 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);
}
static int *
cifs_get_credits_field(struct TCP_Server_Info *server, const int optype)
{
return &server->credits;
}
static unsigned int
cifs_get_credits(struct mid_q_entry *mid)
{
return 1;
}
/*
* 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.
*/
static __u64
cifs_get_next_mid(struct TCP_Server_Info *server)
{
__u64 mid = 0;
__u16 last_mid, cur_mid;
bool collision, reconnect = false;
spin_lock(&server->mid_counter_lock);
/* mid is 16 bit only for CIFS/SMB */
cur_mid = (__u16)((server->current_mid) & 0xffff);
/* we do not want to loop forever */
last_mid = cur_mid;
cur_mid++;
/* avoid 0xFFFF MID */
if (cur_mid == 0xffff)
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;
spin_lock(&server->mid_queue_lock);
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;
}
}
spin_unlock(&server->mid_queue_lock);
/*
* 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)
reconnect = true;
if (!collision) {
mid = (__u64)cur_mid;
server->current_mid = mid;
break;
}
cur_mid++;
}
spin_unlock(&server->mid_counter_lock);
if (reconnect) {
cifs_signal_cifsd_for_reconnect(server, false);
}
return mid;
}
static void
cifs_downgrade_oplock(struct TCP_Server_Info *server,
struct cifsInodeInfo *cinode, __u32 oplock,
__u16 epoch, bool *purge_cache)
{
lockdep_assert_held(&cinode->open_file_lock);
cifs_set_oplock_level(cinode, oplock);
}
static bool
cifs_need_neg(struct TCP_Server_Info *server)
{
return server->maxBuf == 0;
}
static int
cifs_negotiate(const unsigned int xid,
struct cifs_ses *ses,
struct TCP_Server_Info *server)
{
int rc;
rc = CIFSSMBNegotiate(xid, ses, server);
return rc;
}
static unsigned int
smb1_negotiate_wsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
{
__u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
struct TCP_Server_Info *server = tcon->ses->server;
unsigned int wsize;
/* start with specified wsize, or default */
if (ctx->got_wsize)
wsize = ctx->vol_wsize;
else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
wsize = CIFS_DEFAULT_IOSIZE;
else
wsize = CIFS_DEFAULT_NON_POSIX_WSIZE;
/* can server support 24-bit write sizes? (via UNIX extensions) */
if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE);
/*
* no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set?
* Limit it to max buffer offered by the server, minus the size of the
* WRITEX header, not including the 4 byte RFC1001 length.
*/
if (!(server->capabilities & CAP_LARGE_WRITE_X) ||
(!(server->capabilities & CAP_UNIX) && server->sign))
wsize = min_t(unsigned int, wsize,
server->maxBuf - sizeof(WRITE_REQ));
/* hard limit of CIFS_MAX_WSIZE */
wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);
return wsize;
}
static unsigned int
smb1_negotiate_rsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
{
__u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
struct TCP_Server_Info *server = tcon->ses->server;
unsigned int rsize, defsize;
/*
* Set default value...
*
* HACK alert! Ancient servers have very small buffers. Even though
* MS-CIFS indicates that servers are only limited by the client's
* bufsize for reads, testing against win98se shows that it throws
* INVALID_PARAMETER errors if you try to request too large a read.
* OS/2 just sends back short reads.
*
* If the server doesn't advertise CAP_LARGE_READ_X, then assume that
* it can't handle a read request larger than its MaxBufferSize either.
*/
if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP))
defsize = CIFS_DEFAULT_IOSIZE;
else if (server->capabilities & CAP_LARGE_READ_X)
defsize = CIFS_DEFAULT_NON_POSIX_RSIZE;
else
defsize = server->maxBuf - sizeof(READ_RSP);
rsize = ctx->got_rsize ? ctx->vol_rsize : defsize;
/*
* no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to
* the client's MaxBufferSize.
*/
if (!(server->capabilities & CAP_LARGE_READ_X))
rsize = min_t(unsigned int, CIFSMaxBufSize, rsize);
/* hard limit of CIFS_MAX_RSIZE */
rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE);
return rsize;
}
static void
cifs_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb)
{
CIFSSMBQFSDeviceInfo(xid, tcon);
CIFSSMBQFSAttributeInfo(xid, tcon);
}
static int
cifs_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb, const char *full_path)
{
int rc = -EOPNOTSUPP;
FILE_ALL_INFO file_info;
if (tcon->ses->capabilities & CAP_NT_SMBS)
rc = CIFSSMBQPathInfo(xid, tcon, full_path, &file_info,
0 /* not legacy */, cifs_sb->local_nls,
cifs_remap(cifs_sb));
/*
* Non-UNICODE variant of fallback functions below expands wildcards,
* so they cannot be used for querying paths with wildcard characters.
* Therefore for such paths returns -ENOENT as they cannot exist.
*/
if ((rc == -EOPNOTSUPP || rc == -EINVAL) &&
!(tcon->ses->capabilities & CAP_UNICODE) &&
strpbrk(full_path, "*?\"><"))
rc = -ENOENT;
if (rc == -EOPNOTSUPP || rc == -EINVAL)
rc = SMBQueryInformation(xid, tcon, full_path, &file_info,
cifs_sb->local_nls, cifs_remap(cifs_sb));
return rc;
}
static int cifs_query_path_info(const unsigned int xid,
struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb,
const char *full_path,
struct cifs_open_info_data *data)
{
int rc = -EOPNOTSUPP;
FILE_ALL_INFO fi = {};
struct cifs_search_info search_info = {};
bool non_unicode_wildcard = false;
data->reparse_point = false;
data->adjust_tz = false;
/*
* First try CIFSSMBQPathInfo() function which returns more info
* (NumberOfLinks) than CIFSFindFirst() fallback function.
* Some servers like Win9x do not support SMB_QUERY_FILE_ALL_INFO over
* TRANS2_QUERY_PATH_INFORMATION, but supports it with filehandle over
* TRANS2_QUERY_FILE_INFORMATION (function CIFSSMBQFileInfo(). But SMB
* Open command on non-NT servers works only for files, does not work
* for directories. And moreover Win9x SMB server returns bogus data in
* SMB_QUERY_FILE_ALL_INFO Attributes field. So for non-NT servers,
* do not even use CIFSSMBQPathInfo() or CIFSSMBQFileInfo() function.
*/
if (tcon->ses->capabilities & CAP_NT_SMBS)
rc = CIFSSMBQPathInfo(xid, tcon, full_path, &fi, 0 /* not legacy */,
cifs_sb->local_nls, cifs_remap(cifs_sb));
/*
* Non-UNICODE variant of fallback functions below expands wildcards,
* so they cannot be used for querying paths with wildcard characters.
*/
if (rc && !(tcon->ses->capabilities & CAP_UNICODE) && strpbrk(full_path, "*?\"><"))
non_unicode_wildcard = true;
/*
* Then fallback to CIFSFindFirst() which works also with non-NT servers
* but does not does not provide NumberOfLinks.
*/
if ((rc == -EOPNOTSUPP || rc == -EINVAL) &&
!non_unicode_wildcard) {
if (!(tcon->ses->capabilities & tcon->ses->server->vals->cap_nt_find))
search_info.info_level = SMB_FIND_FILE_INFO_STANDARD;
else
search_info.info_level = SMB_FIND_FILE_FULL_DIRECTORY_INFO;
rc = CIFSFindFirst(xid, tcon, full_path, cifs_sb, NULL,
CIFS_SEARCH_CLOSE_ALWAYS | CIFS_SEARCH_CLOSE_AT_END,
&search_info, false);
if (rc == 0) {
if (!(tcon->ses->capabilities & tcon->ses->server->vals->cap_nt_find)) {
FIND_FILE_STANDARD_INFO *di;
int offset = tcon->ses->server->timeAdj;
di = (FIND_FILE_STANDARD_INFO *)search_info.srch_entries_start;
fi.CreationTime = cpu_to_le64(cifs_UnixTimeToNT(cnvrtDosUnixTm(
di->CreationDate, di->CreationTime, offset)));
fi.LastAccessTime = cpu_to_le64(cifs_UnixTimeToNT(cnvrtDosUnixTm(
di->LastAccessDate, di->LastAccessTime, offset)));
fi.LastWriteTime = cpu_to_le64(cifs_UnixTimeToNT(cnvrtDosUnixTm(
di->LastWriteDate, di->LastWriteTime, offset)));
fi.ChangeTime = fi.LastWriteTime;
fi.Attributes = cpu_to_le32(le16_to_cpu(di->Attributes));
fi.AllocationSize = cpu_to_le64(le32_to_cpu(di->AllocationSize));
fi.EndOfFile = cpu_to_le64(le32_to_cpu(di->DataSize));
} else {
FILE_FULL_DIRECTORY_INFO *di;
di = (FILE_FULL_DIRECTORY_INFO *)search_info.srch_entries_start;
fi.CreationTime = di->CreationTime;
fi.LastAccessTime = di->LastAccessTime;
fi.LastWriteTime = di->LastWriteTime;
fi.ChangeTime = di->ChangeTime;
fi.Attributes = di->ExtFileAttributes;
fi.AllocationSize = di->AllocationSize;
fi.EndOfFile = di->EndOfFile;
fi.EASize = di->EaSize;
}
fi.NumberOfLinks = cpu_to_le32(1);
fi.DeletePending = 0;
fi.Directory = !!(le32_to_cpu(fi.Attributes) & ATTR_DIRECTORY);
cifs_buf_release(search_info.ntwrk_buf_start);
} else if (!full_path[0]) {
/*
* CIFSFindFirst() does not work on root path if the
* root path was exported on the server from the top
* level path (drive letter).
*/
rc = -EOPNOTSUPP;
}
}
/*
* If everything failed then fallback to the legacy SMB command
* SMB_COM_QUERY_INFORMATION which works with all servers, but
* provide just few information.
*/
if ((rc == -EOPNOTSUPP || rc == -EINVAL) && !non_unicode_wildcard) {
rc = SMBQueryInformation(xid, tcon, full_path, &fi, cifs_sb->local_nls,
cifs_remap(cifs_sb));
data->adjust_tz = true;
} else if ((rc == -EOPNOTSUPP || rc == -EINVAL) && non_unicode_wildcard) {
/* Path with non-UNICODE wildcard character cannot exist. */
rc = -ENOENT;
}
if (!rc) {
move_cifs_info_to_smb2(&data->fi, &fi);
data->reparse_point = le32_to_cpu(fi.Attributes) & ATTR_REPARSE_POINT;
}
#ifdef CONFIG_CIFS_XATTR
/*
* For non-symlink WSL reparse points it is required to fetch
* EA $LXMOD which contains in its S_DT part the mandatory file type.
*/
if (!rc && data->reparse_point) {
struct smb2_file_full_ea_info *ea;
u32 next = 0;
ea = (struct smb2_file_full_ea_info *)data->wsl.eas;
do {
ea = (void *)((u8 *)ea + next);
next = le32_to_cpu(ea->next_entry_offset);
} while (next);
if (le16_to_cpu(ea->ea_value_length)) {
ea->next_entry_offset = cpu_to_le32(ALIGN(sizeof(*ea) +
ea->ea_name_length + 1 +
le16_to_cpu(ea->ea_value_length), 4));
ea = (void *)((u8 *)ea + le32_to_cpu(ea->next_entry_offset));
}
rc = CIFSSMBQAllEAs(xid, tcon, full_path, SMB2_WSL_XATTR_MODE,
&ea->ea_data[SMB2_WSL_XATTR_NAME_LEN + 1],
SMB2_WSL_XATTR_MODE_SIZE, cifs_sb);
if (rc == SMB2_WSL_XATTR_MODE_SIZE) {
ea->next_entry_offset = cpu_to_le32(0);
ea->flags = 0;
ea->ea_name_length = SMB2_WSL_XATTR_NAME_LEN;
ea->ea_value_length = cpu_to_le16(SMB2_WSL_XATTR_MODE_SIZE);
memcpy(&ea->ea_data[0], SMB2_WSL_XATTR_MODE, SMB2_WSL_XATTR_NAME_LEN + 1);
data->wsl.eas_len += ALIGN(sizeof(*ea) + SMB2_WSL_XATTR_NAME_LEN + 1 +
SMB2_WSL_XATTR_MODE_SIZE, 4);
rc = 0;
} else if (rc >= 0) {
/* It is an error if EA $LXMOD has wrong size. */
rc = -EINVAL;
} else {
/*
* In all other cases ignore error if fetching
* of EA $LXMOD failed. It is needed only for
* non-symlink WSL reparse points and wsl_to_fattr()
* handle the case when EA is missing.
*/
rc = 0;
}
}
/*
* For WSL CHR and BLK reparse points it is required to fetch
* EA $LXDEV which contains major and minor device numbers.
*/
if (!rc && data->reparse_point) {
struct smb2_file_full_ea_info *ea;
u32 next = 0;
ea = (struct smb2_file_full_ea_info *)data->wsl.eas;
do {
ea = (void *)((u8 *)ea + next);
next = le32_to_cpu(ea->next_entry_offset);
} while (next);
if (le16_to_cpu(ea->ea_value_length)) {
ea->next_entry_offset = cpu_to_le32(ALIGN(sizeof(*ea) +
ea->ea_name_length + 1 +
le16_to_cpu(ea->ea_value_length), 4));
ea = (void *)((u8 *)ea + le32_to_cpu(ea->next_entry_offset));
}
rc = CIFSSMBQAllEAs(xid, tcon, full_path, SMB2_WSL_XATTR_DEV,
&ea->ea_data[SMB2_WSL_XATTR_NAME_LEN + 1],
SMB2_WSL_XATTR_DEV_SIZE, cifs_sb);
if (rc == SMB2_WSL_XATTR_DEV_SIZE) {
ea->next_entry_offset = cpu_to_le32(0);
ea->flags = 0;
ea->ea_name_length = SMB2_WSL_XATTR_NAME_LEN;
ea->ea_value_length = cpu_to_le16(SMB2_WSL_XATTR_DEV_SIZE);
memcpy(&ea->ea_data[0], SMB2_WSL_XATTR_DEV, SMB2_WSL_XATTR_NAME_LEN + 1);
data->wsl.eas_len += ALIGN(sizeof(*ea) + SMB2_WSL_XATTR_NAME_LEN + 1 +
SMB2_WSL_XATTR_MODE_SIZE, 4);
rc = 0;
} else if (rc >= 0) {
/* It is an error if EA $LXDEV has wrong size. */
rc = -EINVAL;
} else {
/*
* In all other cases ignore error if fetching
* of EA $LXDEV failed. It is needed only for
* WSL CHR and BLK reparse points and wsl_to_fattr()
* handle the case when EA is missing.
*/
rc = 0;
}
}
#endif
return rc;
}
static int cifs_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb, const char *full_path,
u64 *uniqueid, struct cifs_open_info_data *unused)
{
/*
* We can not use the IndexNumber field by default from Windows or
* Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA
* CIFS spec claims that this value is unique within the scope of a
* share, and the windows docs hint that it's actually unique
* per-machine.
*
* There may be higher info levels that work but are there Windows
* server or network appliances for which IndexNumber field is not
* guaranteed unique?
*
* CIFSGetSrvInodeNumber() uses SMB_QUERY_FILE_INTERNAL_INFO
* which is SMB PASSTHROUGH level therefore check for capability.
* Note that this function can be called with tcon == NULL.
*/
if (tcon && !(tcon->ses->capabilities & CAP_INFOLEVEL_PASSTHRU))
return -EOPNOTSUPP;
return CIFSGetSrvInodeNumber(xid, tcon, full_path, uniqueid,
cifs_sb->local_nls,
cifs_remap(cifs_sb));
}
static int cifs_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
struct cifsFileInfo *cfile, struct cifs_open_info_data *data)
{
int rc;
FILE_ALL_INFO fi = {};
/*
* CIFSSMBQFileInfo() for non-NT servers returns bogus data in
* Attributes fields. So do not use this command for non-NT servers.
*/
if (!(tcon->ses->capabilities & CAP_NT_SMBS))
return -EOPNOTSUPP;
if (cfile->symlink_target) {
data->symlink_target = kstrdup(cfile->symlink_target, GFP_KERNEL);
if (!data->symlink_target)
return -ENOMEM;
}
rc = CIFSSMBQFileInfo(xid, tcon, cfile->fid.netfid, &fi);
if (!rc)
move_cifs_info_to_smb2(&data->fi, &fi);
return rc;
}
static void
cifs_clear_stats(struct cifs_tcon *tcon)
{
atomic_set(&tcon->stats.cifs_stats.num_writes, 0);
atomic_set(&tcon->stats.cifs_stats.num_reads, 0);
atomic_set(&tcon->stats.cifs_stats.num_flushes, 0);
atomic_set(&tcon->stats.cifs_stats.num_oplock_brks, 0);
atomic_set(&tcon->stats.cifs_stats.num_opens, 0);
atomic_set(&tcon->stats.cifs_stats.num_posixopens, 0);
atomic_set(&tcon->stats.cifs_stats.num_posixmkdirs, 0);
atomic_set(&tcon->stats.cifs_stats.num_closes, 0);
atomic_set(&tcon->stats.cifs_stats.num_deletes, 0);
atomic_set(&tcon->stats.cifs_stats.num_mkdirs, 0);
atomic_set(&tcon->stats.cifs_stats.num_rmdirs, 0);
atomic_set(&tcon->stats.cifs_stats.num_renames, 0);
atomic_set(&tcon->stats.cifs_stats.num_t2renames, 0);
atomic_set(&tcon->stats.cifs_stats.num_ffirst, 0);
atomic_set(&tcon->stats.cifs_stats.num_fnext, 0);
atomic_set(&tcon->stats.cifs_stats.num_fclose, 0);
atomic_set(&tcon->stats.cifs_stats.num_hardlinks, 0);
atomic_set(&tcon->stats.cifs_stats.num_symlinks, 0);
atomic_set(&tcon->stats.cifs_stats.num_locks, 0);
atomic_set(&tcon->stats.cifs_stats.num_acl_get, 0);
atomic_set(&tcon->stats.cifs_stats.num_acl_set, 0);
}
static void
cifs_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
{
seq_printf(m, " Oplocks breaks: %d",
atomic_read(&tcon->stats.cifs_stats.num_oplock_brks));
seq_printf(m, "\nReads: %d Bytes: %llu",
atomic_read(&tcon->stats.cifs_stats.num_reads),
(long long)(tcon->bytes_read));
seq_printf(m, "\nWrites: %d Bytes: %llu",
atomic_read(&tcon->stats.cifs_stats.num_writes),
(long long)(tcon->bytes_written));
seq_printf(m, "\nFlushes: %d",
atomic_read(&tcon->stats.cifs_stats.num_flushes));
seq_printf(m, "\nLocks: %d HardLinks: %d Symlinks: %d",
atomic_read(&tcon->stats.cifs_stats.num_locks),
atomic_read(&tcon->stats.cifs_stats.num_hardlinks),
atomic_read(&tcon->stats.cifs_stats.num_symlinks));
seq_printf(m, "\nOpens: %d Closes: %d Deletes: %d",
atomic_read(&tcon->stats.cifs_stats.num_opens),
atomic_read(&tcon->stats.cifs_stats.num_closes),
atomic_read(&tcon->stats.cifs_stats.num_deletes));
seq_printf(m, "\nPosix Opens: %d Posix Mkdirs: %d",
atomic_read(&tcon->stats.cifs_stats.num_posixopens),
atomic_read(&tcon->stats.cifs_stats.num_posixmkdirs));
seq_printf(m, "\nMkdirs: %d Rmdirs: %d",
atomic_read(&tcon->stats.cifs_stats.num_mkdirs),
atomic_read(&tcon->stats.cifs_stats.num_rmdirs));
seq_printf(m, "\nRenames: %d T2 Renames %d",
atomic_read(&tcon->stats.cifs_stats.num_renames),
atomic_read(&tcon->stats.cifs_stats.num_t2renames));
seq_printf(m, "\nFindFirst: %d FNext %d FClose %d",
atomic_read(&tcon->stats.cifs_stats.num_ffirst),
atomic_read(&tcon->stats.cifs_stats.num_fnext),
atomic_read(&tcon->stats.cifs_stats.num_fclose));
}
static void
cifs_mkdir_setinfo(struct inode *inode, const char *full_path,
struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
const unsigned int xid)
{
FILE_BASIC_INFO info;
struct cifsInodeInfo *cifsInode;
u32 dosattrs;
int rc;
memset(&info, 0, sizeof(info));
cifsInode = CIFS_I(inode);
dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
info.Attributes = cpu_to_le32(dosattrs);
rc = CIFSSMBSetPathInfo(xid, tcon, full_path, &info, cifs_sb->local_nls,
cifs_sb);
if (rc == -EOPNOTSUPP || rc == -EINVAL)
rc = SMBSetInformation(xid, tcon, full_path,
info.Attributes,
0 /* do not change write time */,
cifs_sb->local_nls, cifs_sb);
if (rc == 0)
cifsInode->cifsAttrs = dosattrs;
}
static int cifs_open_file(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock,
void *buf)
{
struct cifs_open_info_data *data = buf;
FILE_ALL_INFO fi = {};
int rc;
if (!(oparms->tcon->ses->capabilities & CAP_NT_SMBS))
rc = SMBLegacyOpen(xid, oparms->tcon, oparms->path,
oparms->disposition,
oparms->desired_access,
oparms->create_options,
&oparms->fid->netfid, oplock, &fi,
oparms->cifs_sb->local_nls,
cifs_remap(oparms->cifs_sb));
else
rc = CIFS_open(xid, oparms, oplock, &fi);
if (!rc && data)
move_cifs_info_to_smb2(&data->fi, &fi);
return rc;
}
static void
cifs_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
{
struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
lockdep_assert_held(&cinode->open_file_lock);
cfile->fid.netfid = fid->netfid;
cifs_set_oplock_level(cinode, oplock);
cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
}
static int
cifs_close_file(const unsigned int xid, struct cifs_tcon *tcon,
struct cifs_fid *fid)
{
return CIFSSMBClose(xid, tcon, fid->netfid);
}
static int
cifs_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
struct cifs_fid *fid)
{
return CIFSSMBFlush(xid, tcon, fid->netfid);
}
static int
cifs_sync_read(const unsigned int xid, struct cifs_fid *pfid,
struct cifs_io_parms *parms, unsigned int *bytes_read,
char **buf, int *buf_type)
{
parms->netfid = pfid->netfid;
return CIFSSMBRead(xid, parms, bytes_read, buf, buf_type);
}
static int
cifs_sync_write(const unsigned int xid, struct cifs_fid *pfid,
struct cifs_io_parms *parms, unsigned int *written,
struct kvec *iov, unsigned long nr_segs)
{
parms->netfid = pfid->netfid;
return CIFSSMBWrite2(xid, parms, written, iov, nr_segs);
}
static int
smb_set_file_info(struct inode *inode, const char *full_path,
FILE_BASIC_INFO *buf, const unsigned int xid)
{
int oplock = 0;
int rc;
__u32 netpid;
struct cifs_fid fid;
struct cifs_open_parms oparms;
struct cifsFileInfo *open_file;
FILE_BASIC_INFO new_buf;
struct cifs_open_info_data query_data = {};
__le64 write_time = buf->LastWriteTime;
struct cifsInodeInfo *cinode = CIFS_I(inode);
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct tcon_link *tlink = NULL;
struct cifs_tcon *tcon;
/* if the file is already open for write, just use that fileid */
open_file = find_writable_file(cinode, FIND_FSUID_ONLY);
if (open_file) {
fid.netfid = open_file->fid.netfid;
netpid = open_file->pid;
tcon = tlink_tcon(open_file->tlink);
} else {
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink)) {
rc = PTR_ERR(tlink);
tlink = NULL;
goto out;
}
tcon = tlink_tcon(tlink);
}
/*
* Non-NT servers interprets zero time value in SMB_SET_FILE_BASIC_INFO
* over TRANS2_SET_FILE_INFORMATION as a valid time value. NT servers
* interprets zero time value as do not change existing value on server.
* API of ->set_file_info() callback expects that zero time value has
* the NT meaning - do not change. Therefore if server is non-NT and
* some time values in "buf" are zero, then fetch missing time values.
*/
if (!(tcon->ses->capabilities & CAP_NT_SMBS) &&
(!buf->CreationTime || !buf->LastAccessTime ||
!buf->LastWriteTime || !buf->ChangeTime)) {
rc = cifs_query_path_info(xid, tcon, cifs_sb, full_path, &query_data);
if (rc) {
if (open_file) {
cifsFileInfo_put(open_file);
open_file = NULL;
}
goto out;
}
/*
* Original write_time from buf->LastWriteTime is preserved
* as SMBSetInformation() interprets zero as do not change.
*/
new_buf = *buf;
buf = &new_buf;
if (!buf->CreationTime)
buf->CreationTime = query_data.fi.CreationTime;
if (!buf->LastAccessTime)
buf->LastAccessTime = query_data.fi.LastAccessTime;
if (!buf->LastWriteTime)
buf->LastWriteTime = query_data.fi.LastWriteTime;
if (!buf->ChangeTime)
buf->ChangeTime = query_data.fi.ChangeTime;
}
if (open_file)
goto set_via_filehandle;
rc = CIFSSMBSetPathInfo(xid, tcon, full_path, buf, cifs_sb->local_nls,
cifs_sb);
if (rc == 0) {
cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
goto out;
} else if (rc != -EOPNOTSUPP && rc != -EINVAL) {
goto out;
}
oparms = (struct cifs_open_parms) {
.tcon = tcon,
.cifs_sb = cifs_sb,
.desired_access = SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
.create_options = cifs_create_options(cifs_sb, 0),
.disposition = FILE_OPEN,
.path = full_path,
.fid = &fid,
};
if (S_ISDIR(inode->i_mode) && !(tcon->ses->capabilities & CAP_NT_SMBS)) {
/* Opening directory path is not possible on non-NT servers. */
rc = -EOPNOTSUPP;
} else {
/*
* Use cifs_open_file() instead of CIFS_open() as the
* cifs_open_file() selects the correct function which
* works also on non-NT servers.
*/
rc = cifs_open_file(xid, &oparms, &oplock, NULL);
/*
* Opening path for writing on non-NT servers is not
* possible when the read-only attribute is already set.
* Non-NT server in this case returns -EACCES. For those
* servers the only possible way how to clear the read-only
* bit is via SMB_COM_SETATTR command.
*/
if (rc == -EACCES &&
(cinode->cifsAttrs & ATTR_READONLY) &&
le32_to_cpu(buf->Attributes) != 0 && /* 0 = do not change attrs */
!(le32_to_cpu(buf->Attributes) & ATTR_READONLY) &&
!(tcon->ses->capabilities & CAP_NT_SMBS))
rc = -EOPNOTSUPP;
}
/* Fallback to SMB_COM_SETATTR command when absolutely needed. */
if (rc == -EOPNOTSUPP) {
cifs_dbg(FYI, "calling SetInformation since SetPathInfo for attrs/times not supported by this server\n");
rc = SMBSetInformation(xid, tcon, full_path,
buf->Attributes != 0 ? buf->Attributes : cpu_to_le32(cinode->cifsAttrs),
write_time,
cifs_sb->local_nls, cifs_sb);
if (rc == 0)
cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
else
rc = -EACCES;
goto out;
}
if (rc != 0) {
if (rc == -EIO)
rc = -EINVAL;
goto out;
}
netpid = current->tgid;
cifs_dbg(FYI, "calling SetFileInfo since SetPathInfo for attrs/times not supported by this server\n");
set_via_filehandle:
rc = CIFSSMBSetFileInfo(xid, tcon, buf, fid.netfid, netpid);
if (!rc)
cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
if (open_file == NULL)
CIFSSMBClose(xid, tcon, fid.netfid);
else
cifsFileInfo_put(open_file);
/*
* Setting the read-only bit is not honored on non-NT servers when done
* via open-semantics. So for setting it, use SMB_COM_SETATTR command.
* This command works only after the file is closed, so use it only when
* operation was called without the filehandle.
*/
if (open_file == NULL &&
!(tcon->ses->capabilities & CAP_NT_SMBS) &&
le32_to_cpu(buf->Attributes) & ATTR_READONLY) {
SMBSetInformation(xid, tcon, full_path,
buf->Attributes,
0 /* do not change write time */,
cifs_sb->local_nls, cifs_sb);
}
out:
if (tlink != NULL)
cifs_put_tlink(tlink);
return rc;
}
static int
cifs_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
struct cifsFileInfo *cfile, __u16 compression_state)
{
return CIFSSMB_set_compression(xid, tcon, cfile->fid.netfid,
compression_state);
}
static int
cifs_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
const char *path, struct cifs_sb_info *cifs_sb,
struct cifs_fid *fid, __u16 search_flags,
struct cifs_search_info *srch_inf)
{
int rc;
rc = CIFSFindFirst(xid, tcon, path, cifs_sb,
&fid->netfid, search_flags, srch_inf, true);
if (rc)
cifs_dbg(FYI, "find first failed=%d\n", rc);
return rc;
}
static int
cifs_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
struct cifs_fid *fid, __u16 search_flags,
struct cifs_search_info *srch_inf)
{
return CIFSFindNext(xid, tcon, fid->netfid, search_flags, srch_inf);
}
static int
cifs_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
struct cifs_fid *fid)
{
return CIFSFindClose(xid, tcon, fid->netfid);
}
static int cifs_oplock_response(struct cifs_tcon *tcon, __u64 persistent_fid,
__u64 volatile_fid, __u16 net_fid,
struct cifsInodeInfo *cinode, unsigned int oplock)
{
unsigned int sbflags = cifs_sb_flags(CIFS_SB(cinode));
__u8 op;
op = !!((oplock & CIFS_CACHE_READ_FLG) || (sbflags & CIFS_MOUNT_RO_CACHE));
return CIFSSMBLock(0, tcon, net_fid, current->tgid, 0, 0, 0, 0,
LOCKING_ANDX_OPLOCK_RELEASE, false, op);
}
static int
cifs_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
const char *path, struct cifs_sb_info *cifs_sb, struct kstatfs *buf)
{
int rc = -EOPNOTSUPP;
buf->f_type = CIFS_SUPER_MAGIC;
/*
* We could add a second check for a QFS Unix capability bit
*/
if ((tcon->ses->capabilities & CAP_UNIX) &&
(CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
/*
* Only need to call the old QFSInfo if failed on newer one,
* e.g. by OS/2.
**/
if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
rc = CIFSSMBQFSInfo(xid, tcon, buf);
/*
* Some old Windows servers also do not support level 103, retry with
* older level one if old server failed the previous call or we
* bypassed it because we detected that this was an older LANMAN sess
*/
if (rc)
rc = SMBOldQFSInfo(xid, tcon, buf);
return rc;
}
static int
cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
__u64 length, __u32 type, int lock, int unlock, bool wait)
{
return CIFSSMBLock(xid, tlink_tcon(cfile->tlink), cfile->fid.netfid,
current->tgid, length, offset, unlock, lock,
(__u8)type, wait, 0);
}
static int
cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon,
const unsigned char *searchName, char **symlinkinfo,
const struct nls_table *nls_codepage)
{
#ifdef CONFIG_CIFS_DFS_UPCALL
int rc;
struct dfs_info3_param referral = {0};
rc = get_dfs_path(xid, tcon->ses, searchName, nls_codepage, &referral,
0);
if (!rc) {
*symlinkinfo = kstrdup(referral.node_name, GFP_KERNEL);
free_dfs_info_param(&referral);
if (!*symlinkinfo)
rc = -ENOMEM;
}
return rc;
#else /* No DFS support */
return -EREMOTE;
#endif
}
static int cifs_query_symlink(const unsigned int xid,
struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb,
const char *full_path,
char **target_path)
{
int rc;
cifs_tcon_dbg(FYI, "%s: path=%s\n", __func__, full_path);
if (!cap_unix(tcon->ses))
return -EOPNOTSUPP;
rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path,
cifs_sb->local_nls, cifs_remap(cifs_sb));
if (rc == -EREMOTE)
rc = cifs_unix_dfs_readlink(xid, tcon, full_path,
target_path, cifs_sb->local_nls);
return rc;
}
static struct reparse_data_buffer *cifs_get_reparse_point_buffer(const struct kvec *rsp_iov,
u32 *plen)
{
TRANSACT_IOCTL_RSP *io = rsp_iov->iov_base;
*plen = le16_to_cpu(io->ByteCount);
return (struct reparse_data_buffer *)((__u8 *)&io->hdr.Protocol +
le32_to_cpu(io->DataOffset));
}
static bool
cifs_is_read_op(__u32 oplock)
{
return oplock == OPLOCK_READ;
}
static unsigned int
cifs_wp_retry_size(struct inode *inode)
{
return CIFS_SB(inode->i_sb)->ctx->wsize;
}
static bool
cifs_dir_needs_close(struct cifsFileInfo *cfile)
{
return !cfile->srch_inf.endOfSearch && !cfile->invalidHandle;
}
static bool
cifs_can_echo(struct TCP_Server_Info *server)
{
if (server->tcpStatus == CifsGood)
return true;
return false;
}
static int
cifs_make_node(unsigned int xid, struct inode *inode,
struct dentry *dentry, struct cifs_tcon *tcon,
const char *full_path, umode_t mode, dev_t dev)
{
struct cifs_sb_info *cifs_sb = CIFS_SB(inode);
unsigned int sbflags = cifs_sb_flags(cifs_sb);
struct inode *newinode = NULL;
int rc;
if (tcon->unix_ext) {
/*
* SMB1 Unix Extensions: requires server support but
* works with all special files
*/
struct cifs_unix_set_info_args args = {
.mode = mode & ~current_umask(),
.ctime = NO_CHANGE_64,
.atime = NO_CHANGE_64,
.mtime = NO_CHANGE_64,
.device = dev,
};
if (sbflags & CIFS_MOUNT_SET_UID) {
args.uid = current_fsuid();
args.gid = current_fsgid();
} else {
args.uid = INVALID_UID; /* no change */
args.gid = INVALID_GID; /* no change */
}
rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
cifs_sb->local_nls,
cifs_remap(cifs_sb));
if (rc)
return rc;
rc = cifs_get_inode_info_unix(&newinode, full_path,
inode->i_sb, xid);
if (rc == 0)
d_instantiate(dentry, newinode);
return rc;
} else if (sbflags & CIFS_MOUNT_UNX_EMUL) {
/*
* Check if mounted with mount parm 'sfu' mount parm.
* SFU emulation should work with all servers
* and was used by default in earlier versions of Windows.
*/
return cifs_sfu_make_node(xid, inode, dentry, tcon,
full_path, mode, dev);
} else if (CIFS_REPARSE_SUPPORT(tcon)) {
/*
* mknod via reparse points requires server support for
* storing reparse points, which is available since
* Windows 2000, but was not widely used until release
* of Windows Server 2012 by the Windows NFS server.
*/
return mknod_reparse(xid, inode, dentry, tcon,
full_path, mode, dev);
} else {
return -EOPNOTSUPP;
}
}
static bool
cifs_is_network_name_deleted(char *buf, struct TCP_Server_Info *server)
{
struct smb_hdr *shdr = (struct smb_hdr *)buf;
struct TCP_Server_Info *pserver;
struct cifs_ses *ses;
struct cifs_tcon *tcon;
if (shdr->Flags2 & SMBFLG2_ERR_STATUS) {
if (shdr->Status.CifsError != cpu_to_le32(NT_STATUS_NETWORK_NAME_DELETED))
return false;
} else {
if (shdr->Status.DosError.ErrorClass != ERRSRV ||
shdr->Status.DosError.Error != cpu_to_le16(ERRinvtid))
return false;
}
/* If server is a channel, select the primary channel */
pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
spin_lock(&cifs_tcp_ses_lock);
list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
if (cifs_ses_exiting(ses))
continue;
list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
if (tcon->tid == shdr->Tid) {
spin_lock(&tcon->tc_lock);
tcon->need_reconnect = true;
spin_unlock(&tcon->tc_lock);
spin_unlock(&cifs_tcp_ses_lock);
pr_warn_once("Server share %s deleted.\n",
tcon->tree_name);
return true;
}
}
}
spin_unlock(&cifs_tcp_ses_lock);
return false;
}
struct smb_version_operations smb1_operations = {
.send_cancel = cifs_send_cancel,
.compare_fids = cifs_compare_fids,
.setup_request = cifs_setup_request,
.setup_async_request = cifs_setup_async_request,
.check_receive = cifs_check_receive,
.add_credits = cifs_add_credits,
.set_credits = cifs_set_credits,
.get_credits_field = cifs_get_credits_field,
.get_credits = cifs_get_credits,
.wait_mtu_credits = cifs_wait_mtu_credits,
.get_next_mid = cifs_get_next_mid,
.read_data_offset = cifs_read_data_offset,
.read_data_length = cifs_read_data_length,
.map_error = map_smb_to_linux_error,
.find_mid = cifs_find_mid,
.check_message = checkSMB,
.dump_detail = cifs_dump_detail,
.clear_stats = cifs_clear_stats,
.print_stats = cifs_print_stats,
.is_oplock_break = is_valid_oplock_break,
.downgrade_oplock = cifs_downgrade_oplock,
.check_trans2 = cifs_check_trans2,
.need_neg = cifs_need_neg,
.negotiate = cifs_negotiate,
.negotiate_wsize = smb1_negotiate_wsize,
.negotiate_rsize = smb1_negotiate_rsize,
.sess_setup = CIFS_SessSetup,
.logoff = CIFSSMBLogoff,
.tree_connect = CIFSTCon,
.tree_disconnect = CIFSSMBTDis,
.get_dfs_refer = CIFSGetDFSRefer,
.qfs_tcon = cifs_qfs_tcon,
.is_path_accessible = cifs_is_path_accessible,
.can_echo = cifs_can_echo,
.query_path_info = cifs_query_path_info,
.query_reparse_point = cifs_query_reparse_point,
.query_file_info = cifs_query_file_info,
.get_srv_inum = cifs_get_srv_inum,
.set_path_size = CIFSSMBSetEOF,
.set_file_size = CIFSSMBSetFileSize,
.set_file_info = smb_set_file_info,
.set_compression = cifs_set_compression,
.echo = CIFSSMBEcho,
.mkdir = CIFSSMBMkDir,
.mkdir_setinfo = cifs_mkdir_setinfo,
.rmdir = CIFSSMBRmDir,
.unlink = CIFSSMBDelFile,
.rename_pending_delete = cifs_rename_pending_delete,
.rename = CIFSSMBRename,
.create_hardlink = CIFSCreateHardLink,
.query_symlink = cifs_query_symlink,
.get_reparse_point_buffer = cifs_get_reparse_point_buffer,
.create_reparse_inode = cifs_create_reparse_inode,
.open = cifs_open_file,
.set_fid = cifs_set_fid,
.close = cifs_close_file,
.flush = cifs_flush_file,
.async_readv = cifs_async_readv,
.async_writev = cifs_async_writev,
.sync_read = cifs_sync_read,
.sync_write = cifs_sync_write,
.query_dir_first = cifs_query_dir_first,
.query_dir_next = cifs_query_dir_next,
.close_dir = cifs_close_dir,
.calc_smb_size = smbCalcSize,
.oplock_response = cifs_oplock_response,
.queryfs = cifs_queryfs,
.mand_lock = cifs_mand_lock,
.mand_unlock_range = cifs_unlock_range,
.push_mand_locks = cifs_push_mandatory_locks,
.query_mf_symlink = cifs_query_mf_symlink,
.create_mf_symlink = cifs_create_mf_symlink,
.is_read_op = cifs_is_read_op,
.wp_retry_size = cifs_wp_retry_size,
.dir_needs_close = cifs_dir_needs_close,
.select_sectype = cifs_select_sectype,
#ifdef CONFIG_CIFS_XATTR
.query_all_EAs = CIFSSMBQAllEAs,
.set_EA = CIFSSMBSetEA,
#endif /* CIFS_XATTR */
.get_acl = get_cifs_acl,
.get_acl_by_fid = get_cifs_acl_by_fid,
.set_acl = set_cifs_acl,
.make_node = cifs_make_node,
.is_network_name_deleted = cifs_is_network_name_deleted,
};
struct smb_version_values smb1_values = {
.version_string = SMB1_VERSION_STRING,
.protocol_id = SMB10_PROT_ID,
.large_lock_type = LOCKING_ANDX_LARGE_FILES,
.exclusive_lock_type = 0,
.shared_lock_type = LOCKING_ANDX_SHARED_LOCK,
.unlock_lock_type = 0,
.header_size = sizeof(struct smb_hdr),
.max_header_size = MAX_CIFS_HDR_SIZE,
.read_rsp_size = sizeof(READ_RSP),
.lock_cmd = cpu_to_le16(SMB_COM_LOCKING_ANDX),
.cap_unix = CAP_UNIX,
.cap_nt_find = CAP_NT_SMBS | CAP_NT_FIND,
.cap_large_files = CAP_LARGE_FILES,
.cap_unicode = CAP_UNICODE,
.signing_enabled = SECMODE_SIGN_ENABLED,
.signing_required = SECMODE_SIGN_REQUIRED,
};
