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linux/fs/smb/client/smb2inode.c
Pali Rohár 3eb4051253 cifs: Improve creating native symlinks pointing to directory 
SMB protocol for native symlinks distinguish between symlink to directory
and symlink to file. These two symlink types cannot be exchanged, which
means that symlink of file type pointing to directory cannot be resolved at
all (and vice-versa).

Windows follows this rule for local filesystems (NTFS) and also for SMB.

Linux SMB client currenly creates all native symlinks of file type. Which
means that Windows (and some other SMB clients) cannot resolve symlinks
pointing to directory created by Linux SMB client.

As Linux system does not distinguish between directory and file symlinks,
its API does not provide enough information for Linux SMB client during
creating of native symlinks.

Add some heuristic into the Linux SMB client for choosing the correct
symlink type during symlink creation. Check if the symlink target location
ends with slash, or last path component is dot or dot-dot, and check if the
target location on SMB share exists and is a directory. If at least one
condition is truth then create a new SMB symlink of directory type.
Otherwise create it as file type symlink.

This change improves interoperability with Windows systems. Windows systems
would be able to resolve more SMB symlinks created by Linux SMB client
which points to existing directory.

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
2024-10-06 22:57:12 -05:00

1305 lines
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// SPDX-License-Identifier: LGPL-2.1
/*
*
* Copyright (C) International Business Machines Corp., 2002, 2011
* Etersoft, 2012
* Author(s): Pavel Shilovsky (pshilovsky@samba.org),
* Steve French (sfrench@us.ibm.com)
*
*/
#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <asm/div64.h>
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
#include "cifs_unicode.h"
#include "fscache.h"
#include "smb2glob.h"
#include "smb2pdu.h"
#include "smb2proto.h"
#include "cached_dir.h"
#include "../common/smb2status.h"
static struct reparse_data_buffer *reparse_buf_ptr(struct kvec *iov)
{
struct reparse_data_buffer *buf;
struct smb2_ioctl_rsp *io = iov->iov_base;
u32 off, count, len;
count = le32_to_cpu(io->OutputCount);
off = le32_to_cpu(io->OutputOffset);
if (check_add_overflow(off, count, &len) || len > iov->iov_len)
return ERR_PTR(-EIO);
buf = (struct reparse_data_buffer *)((u8 *)io + off);
len = sizeof(*buf);
if (count < len || count < le16_to_cpu(buf->ReparseDataLength) + len)
return ERR_PTR(-EIO);
return buf;
}
static inline __u32 file_create_options(struct dentry *dentry)
{
struct cifsInodeInfo *ci;
if (dentry) {
ci = CIFS_I(d_inode(dentry));
if (ci->cifsAttrs & ATTR_REPARSE)
return OPEN_REPARSE_POINT;
}
return 0;
}
/* Parse owner and group from SMB3.1.1 POSIX query info */
static int parse_posix_sids(struct cifs_open_info_data *data,
struct kvec *rsp_iov)
{
struct smb2_query_info_rsp *qi = rsp_iov->iov_base;
unsigned int out_len = le32_to_cpu(qi->OutputBufferLength);
unsigned int qi_len = sizeof(data->posix_fi);
int owner_len, group_len;
u8 *sidsbuf, *sidsbuf_end;
if (out_len <= qi_len)
return -EINVAL;
sidsbuf = (u8 *)qi + le16_to_cpu(qi->OutputBufferOffset) + qi_len;
sidsbuf_end = sidsbuf + out_len - qi_len;
owner_len = posix_info_sid_size(sidsbuf, sidsbuf_end);
if (owner_len == -1)
return -EINVAL;
memcpy(&data->posix_owner, sidsbuf, owner_len);
group_len = posix_info_sid_size(sidsbuf + owner_len, sidsbuf_end);
if (group_len == -1)
return -EINVAL;
memcpy(&data->posix_group, sidsbuf + owner_len, group_len);
return 0;
}
struct wsl_query_ea {
__le32 next;
__u8 name_len;
__u8 name[SMB2_WSL_XATTR_NAME_LEN + 1];
} __packed;
#define NEXT_OFF cpu_to_le32(sizeof(struct wsl_query_ea))
static const struct wsl_query_ea wsl_query_eas[] = {
{ .next = NEXT_OFF, .name_len = SMB2_WSL_XATTR_NAME_LEN, .name = SMB2_WSL_XATTR_UID, },
{ .next = NEXT_OFF, .name_len = SMB2_WSL_XATTR_NAME_LEN, .name = SMB2_WSL_XATTR_GID, },
{ .next = NEXT_OFF, .name_len = SMB2_WSL_XATTR_NAME_LEN, .name = SMB2_WSL_XATTR_MODE, },
{ .next = 0, .name_len = SMB2_WSL_XATTR_NAME_LEN, .name = SMB2_WSL_XATTR_DEV, },
};
static int check_wsl_eas(struct kvec *rsp_iov)
{
struct smb2_file_full_ea_info *ea;
struct smb2_query_info_rsp *rsp = rsp_iov->iov_base;
unsigned long addr;
u32 outlen, next;
u16 vlen;
u8 nlen;
u8 *end;
outlen = le32_to_cpu(rsp->OutputBufferLength);
if (outlen < SMB2_WSL_MIN_QUERY_EA_RESP_SIZE ||
outlen > SMB2_WSL_MAX_QUERY_EA_RESP_SIZE)
return -EINVAL;
ea = (void *)((u8 *)rsp_iov->iov_base +
le16_to_cpu(rsp->OutputBufferOffset));
end = (u8 *)rsp_iov->iov_base + rsp_iov->iov_len;
for (;;) {
if ((u8 *)ea > end - sizeof(*ea))
return -EINVAL;
nlen = ea->ea_name_length;
vlen = le16_to_cpu(ea->ea_value_length);
if (nlen != SMB2_WSL_XATTR_NAME_LEN ||
(u8 *)ea + nlen + 1 + vlen > end)
return -EINVAL;
switch (vlen) {
case 4:
if (strncmp(ea->ea_data, SMB2_WSL_XATTR_UID, nlen) &&
strncmp(ea->ea_data, SMB2_WSL_XATTR_GID, nlen) &&
strncmp(ea->ea_data, SMB2_WSL_XATTR_MODE, nlen))
return -EINVAL;
break;
case 8:
if (strncmp(ea->ea_data, SMB2_WSL_XATTR_DEV, nlen))
return -EINVAL;
break;
case 0:
if (!strncmp(ea->ea_data, SMB2_WSL_XATTR_UID, nlen) ||
!strncmp(ea->ea_data, SMB2_WSL_XATTR_GID, nlen) ||
!strncmp(ea->ea_data, SMB2_WSL_XATTR_MODE, nlen) ||
!strncmp(ea->ea_data, SMB2_WSL_XATTR_DEV, nlen))
break;
fallthrough;
default:
return -EINVAL;
}
next = le32_to_cpu(ea->next_entry_offset);
if (!next)
break;
if (!IS_ALIGNED(next, 4) ||
check_add_overflow((unsigned long)ea, next, &addr))
return -EINVAL;
ea = (void *)addr;
}
return 0;
}
/*
* note: If cfile is passed, the reference to it is dropped here.
* So make sure that you do not reuse cfile after return from this func.
*
* If passing @out_iov and @out_buftype, ensure to make them both large enough
* (>= 3) to hold all compounded responses. Caller is also responsible for
* freeing them up with free_rsp_buf().
*/
static int smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb, const char *full_path,
struct cifs_open_parms *oparms, struct kvec *in_iov,
int *cmds, int num_cmds, struct cifsFileInfo *cfile,
struct kvec *out_iov, int *out_buftype, struct dentry *dentry)
{
struct reparse_data_buffer *rbuf;
struct smb2_compound_vars *vars = NULL;
struct kvec *rsp_iov, *iov;
struct smb_rqst *rqst;
int rc;
__le16 *utf16_path = NULL;
__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
struct cifs_fid fid;
struct cifs_ses *ses = tcon->ses;
struct TCP_Server_Info *server;
int num_rqst = 0, i;
int resp_buftype[MAX_COMPOUND];
struct smb2_query_info_rsp *qi_rsp = NULL;
struct cifs_open_info_data *idata;
struct inode *inode = NULL;
int flags = 0;
__u8 delete_pending[8] = {1, 0, 0, 0, 0, 0, 0, 0};
unsigned int size[2];
void *data[2];
unsigned int len;
int retries = 0, cur_sleep = 1;
replay_again:
/* reinitialize for possible replay */
flags = 0;
oplock = SMB2_OPLOCK_LEVEL_NONE;
num_rqst = 0;
server = cifs_pick_channel(ses);
vars = kzalloc(sizeof(*vars), GFP_ATOMIC);
if (vars == NULL)
return -ENOMEM;
rqst = &vars->rqst[0];
rsp_iov = &vars->rsp_iov[0];
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
for (i = 0; i < ARRAY_SIZE(resp_buftype); i++)
resp_buftype[i] = CIFS_NO_BUFFER;
/* We already have a handle so we can skip the open */
if (cfile)
goto after_open;
/* Open */
utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
if (!utf16_path) {
rc = -ENOMEM;
goto finished;
}
/* if there is an existing lease, reuse it */
/*
* note: files with hardlinks cause unexpected behaviour. As per MS-SMB2,
* lease keys are associated with the filepath. We are maintaining lease keys
* with the inode on the client. If the file has hardlinks, it is possible
* that the lease for a file be reused for an operation on its hardlink or
* vice versa.
* As a workaround, send request using an existing lease key and if the server
* returns STATUS_INVALID_PARAMETER, which maps to EINVAL, send the request
* again without the lease.
*/
if (dentry) {
inode = d_inode(dentry);
if (CIFS_I(inode)->lease_granted && server->ops->get_lease_key) {
oplock = SMB2_OPLOCK_LEVEL_LEASE;
server->ops->get_lease_key(inode, &fid);
}
}
vars->oparms = *oparms;
vars->oparms.fid = &fid;
rqst[num_rqst].rq_iov = &vars->open_iov[0];
rqst[num_rqst].rq_nvec = SMB2_CREATE_IOV_SIZE;
rc = SMB2_open_init(tcon, server,
&rqst[num_rqst], &oplock, &vars->oparms,
utf16_path);
kfree(utf16_path);
if (rc)
goto finished;
smb2_set_next_command(tcon, &rqst[num_rqst]);
after_open:
num_rqst++;
rc = 0;
for (i = 0; i < num_cmds; i++) {
/* Operation */
switch (cmds[i]) {
case SMB2_OP_QUERY_INFO:
rqst[num_rqst].rq_iov = &vars->qi_iov;
rqst[num_rqst].rq_nvec = 1;
if (cfile) {
rc = SMB2_query_info_init(tcon, server,
&rqst[num_rqst],
cfile->fid.persistent_fid,
cfile->fid.volatile_fid,
FILE_ALL_INFORMATION,
SMB2_O_INFO_FILE, 0,
sizeof(struct smb2_file_all_info) +
PATH_MAX * 2, 0, NULL);
} else {
rc = SMB2_query_info_init(tcon, server,
&rqst[num_rqst],
COMPOUND_FID,
COMPOUND_FID,
FILE_ALL_INFORMATION,
SMB2_O_INFO_FILE, 0,
sizeof(struct smb2_file_all_info) +
PATH_MAX * 2, 0, NULL);
}
if (!rc && (!cfile || num_rqst > 1)) {
smb2_set_next_command(tcon, &rqst[num_rqst]);
smb2_set_related(&rqst[num_rqst]);
} else if (rc) {
goto finished;
}
num_rqst++;
trace_smb3_query_info_compound_enter(xid, ses->Suid,
tcon->tid, full_path);
break;
case SMB2_OP_POSIX_QUERY_INFO:
rqst[num_rqst].rq_iov = &vars->qi_iov;
rqst[num_rqst].rq_nvec = 1;
if (cfile) {
/* TBD: fix following to allow for longer SIDs */
rc = SMB2_query_info_init(tcon, server,
&rqst[num_rqst],
cfile->fid.persistent_fid,
cfile->fid.volatile_fid,
SMB_FIND_FILE_POSIX_INFO,
SMB2_O_INFO_FILE, 0,
sizeof(struct smb311_posix_qinfo *) +
(PATH_MAX * 2) +
(sizeof(struct smb_sid) * 2), 0, NULL);
} else {
rc = SMB2_query_info_init(tcon, server,
&rqst[num_rqst],
COMPOUND_FID,
COMPOUND_FID,
SMB_FIND_FILE_POSIX_INFO,
SMB2_O_INFO_FILE, 0,
sizeof(struct smb311_posix_qinfo *) +
(PATH_MAX * 2) +
(sizeof(struct smb_sid) * 2), 0, NULL);
}
if (!rc && (!cfile || num_rqst > 1)) {
smb2_set_next_command(tcon, &rqst[num_rqst]);
smb2_set_related(&rqst[num_rqst]);
} else if (rc) {
goto finished;
}
num_rqst++;
trace_smb3_posix_query_info_compound_enter(xid, ses->Suid,
tcon->tid, full_path);
break;
case SMB2_OP_DELETE:
trace_smb3_delete_enter(xid, ses->Suid, tcon->tid, full_path);
break;
case SMB2_OP_MKDIR:
/*
* Directories are created through parameters in the
* SMB2_open() call.
*/
trace_smb3_mkdir_enter(xid, ses->Suid, tcon->tid, full_path);
break;
case SMB2_OP_RMDIR:
rqst[num_rqst].rq_iov = &vars->si_iov[0];
rqst[num_rqst].rq_nvec = 1;
size[0] = 1; /* sizeof __u8 See MS-FSCC section 2.4.11 */
data[0] = &delete_pending[0];
rc = SMB2_set_info_init(tcon, server,
&rqst[num_rqst], COMPOUND_FID,
COMPOUND_FID, current->tgid,
FILE_DISPOSITION_INFORMATION,
SMB2_O_INFO_FILE, 0, data, size);
if (rc)
goto finished;
smb2_set_next_command(tcon, &rqst[num_rqst]);
smb2_set_related(&rqst[num_rqst++]);
trace_smb3_rmdir_enter(xid, ses->Suid, tcon->tid, full_path);
break;
case SMB2_OP_SET_EOF:
rqst[num_rqst].rq_iov = &vars->si_iov[0];
rqst[num_rqst].rq_nvec = 1;
size[0] = in_iov[i].iov_len;
data[0] = in_iov[i].iov_base;
if (cfile) {
rc = SMB2_set_info_init(tcon, server,
&rqst[num_rqst],
cfile->fid.persistent_fid,
cfile->fid.volatile_fid,
current->tgid,
FILE_END_OF_FILE_INFORMATION,
SMB2_O_INFO_FILE, 0,
data, size);
} else {
rc = SMB2_set_info_init(tcon, server,
&rqst[num_rqst],
COMPOUND_FID,
COMPOUND_FID,
current->tgid,
FILE_END_OF_FILE_INFORMATION,
SMB2_O_INFO_FILE, 0,
data, size);
}
if (!rc && (!cfile || num_rqst > 1)) {
smb2_set_next_command(tcon, &rqst[num_rqst]);
smb2_set_related(&rqst[num_rqst]);
} else if (rc) {
goto finished;
}
num_rqst++;
trace_smb3_set_eof_enter(xid, ses->Suid, tcon->tid, full_path);
break;
case SMB2_OP_SET_INFO:
rqst[num_rqst].rq_iov = &vars->si_iov[0];
rqst[num_rqst].rq_nvec = 1;
size[0] = in_iov[i].iov_len;
data[0] = in_iov[i].iov_base;
if (cfile) {
rc = SMB2_set_info_init(tcon, server,
&rqst[num_rqst],
cfile->fid.persistent_fid,
cfile->fid.volatile_fid, current->tgid,
FILE_BASIC_INFORMATION,
SMB2_O_INFO_FILE, 0, data, size);
} else {
rc = SMB2_set_info_init(tcon, server,
&rqst[num_rqst],
COMPOUND_FID,
COMPOUND_FID, current->tgid,
FILE_BASIC_INFORMATION,
SMB2_O_INFO_FILE, 0, data, size);
}
if (!rc && (!cfile || num_rqst > 1)) {
smb2_set_next_command(tcon, &rqst[num_rqst]);
smb2_set_related(&rqst[num_rqst]);
} else if (rc) {
goto finished;
}
num_rqst++;
trace_smb3_set_info_compound_enter(xid, ses->Suid,
tcon->tid, full_path);
break;
case SMB2_OP_RENAME:
rqst[num_rqst].rq_iov = &vars->si_iov[0];
rqst[num_rqst].rq_nvec = 2;
len = in_iov[i].iov_len;
vars->rename_info.ReplaceIfExists = 1;
vars->rename_info.RootDirectory = 0;
vars->rename_info.FileNameLength = cpu_to_le32(len);
size[0] = sizeof(struct smb2_file_rename_info);
data[0] = &vars->rename_info;
size[1] = len + 2 /* null */;
data[1] = in_iov[i].iov_base;
if (cfile) {
rc = SMB2_set_info_init(tcon, server,
&rqst[num_rqst],
cfile->fid.persistent_fid,
cfile->fid.volatile_fid,
current->tgid, FILE_RENAME_INFORMATION,
SMB2_O_INFO_FILE, 0, data, size);
} else {
rc = SMB2_set_info_init(tcon, server,
&rqst[num_rqst],
COMPOUND_FID, COMPOUND_FID,
current->tgid, FILE_RENAME_INFORMATION,
SMB2_O_INFO_FILE, 0, data, size);
}
if (!rc && (!cfile || num_rqst > 1)) {
smb2_set_next_command(tcon, &rqst[num_rqst]);
smb2_set_related(&rqst[num_rqst]);
} else if (rc) {
goto finished;
}
num_rqst++;
trace_smb3_rename_enter(xid, ses->Suid, tcon->tid, full_path);
break;
case SMB2_OP_HARDLINK:
rqst[num_rqst].rq_iov = &vars->si_iov[0];
rqst[num_rqst].rq_nvec = 2;
len = in_iov[i].iov_len;
vars->link_info.ReplaceIfExists = 0;
vars->link_info.RootDirectory = 0;
vars->link_info.FileNameLength = cpu_to_le32(len);
size[0] = sizeof(struct smb2_file_link_info);
data[0] = &vars->link_info;
size[1] = len + 2 /* null */;
data[1] = in_iov[i].iov_base;
rc = SMB2_set_info_init(tcon, server,
&rqst[num_rqst], COMPOUND_FID,
COMPOUND_FID, current->tgid,
FILE_LINK_INFORMATION,
SMB2_O_INFO_FILE, 0, data, size);
if (rc)
goto finished;
smb2_set_next_command(tcon, &rqst[num_rqst]);
smb2_set_related(&rqst[num_rqst++]);
trace_smb3_hardlink_enter(xid, ses->Suid, tcon->tid, full_path);
break;
case SMB2_OP_SET_REPARSE:
rqst[num_rqst].rq_iov = vars->io_iov;
rqst[num_rqst].rq_nvec = ARRAY_SIZE(vars->io_iov);
if (cfile) {
rc = SMB2_ioctl_init(tcon, server, &rqst[num_rqst],
cfile->fid.persistent_fid,
cfile->fid.volatile_fid,
FSCTL_SET_REPARSE_POINT,
in_iov[i].iov_base,
in_iov[i].iov_len, 0);
} else {
rc = SMB2_ioctl_init(tcon, server, &rqst[num_rqst],
COMPOUND_FID, COMPOUND_FID,
FSCTL_SET_REPARSE_POINT,
in_iov[i].iov_base,
in_iov[i].iov_len, 0);
}
if (!rc && (!cfile || num_rqst > 1)) {
smb2_set_next_command(tcon, &rqst[num_rqst]);
smb2_set_related(&rqst[num_rqst]);
} else if (rc) {
goto finished;
}
num_rqst++;
trace_smb3_set_reparse_compound_enter(xid, ses->Suid,
tcon->tid, full_path);
break;
case SMB2_OP_GET_REPARSE:
rqst[num_rqst].rq_iov = vars->io_iov;
rqst[num_rqst].rq_nvec = ARRAY_SIZE(vars->io_iov);
if (cfile) {
rc = SMB2_ioctl_init(tcon, server, &rqst[num_rqst],
cfile->fid.persistent_fid,
cfile->fid.volatile_fid,
FSCTL_GET_REPARSE_POINT,
NULL, 0, CIFSMaxBufSize);
} else {
rc = SMB2_ioctl_init(tcon, server, &rqst[num_rqst],
COMPOUND_FID, COMPOUND_FID,
FSCTL_GET_REPARSE_POINT,
NULL, 0, CIFSMaxBufSize);
}
if (!rc && (!cfile || num_rqst > 1)) {
smb2_set_next_command(tcon, &rqst[num_rqst]);
smb2_set_related(&rqst[num_rqst]);
} else if (rc) {
goto finished;
}
num_rqst++;
trace_smb3_get_reparse_compound_enter(xid, ses->Suid,
tcon->tid, full_path);
break;
case SMB2_OP_QUERY_WSL_EA:
rqst[num_rqst].rq_iov = &vars->ea_iov;
rqst[num_rqst].rq_nvec = 1;
if (cfile) {
rc = SMB2_query_info_init(tcon, server,
&rqst[num_rqst],
cfile->fid.persistent_fid,
cfile->fid.volatile_fid,
FILE_FULL_EA_INFORMATION,
SMB2_O_INFO_FILE, 0,
SMB2_WSL_MAX_QUERY_EA_RESP_SIZE,
sizeof(wsl_query_eas),
(void *)wsl_query_eas);
} else {
rc = SMB2_query_info_init(tcon, server,
&rqst[num_rqst],
COMPOUND_FID,
COMPOUND_FID,
FILE_FULL_EA_INFORMATION,
SMB2_O_INFO_FILE, 0,
SMB2_WSL_MAX_QUERY_EA_RESP_SIZE,
sizeof(wsl_query_eas),
(void *)wsl_query_eas);
}
if (!rc && (!cfile || num_rqst > 1)) {
smb2_set_next_command(tcon, &rqst[num_rqst]);
smb2_set_related(&rqst[num_rqst]);
} else if (rc) {
goto finished;
}
num_rqst++;
break;
default:
cifs_dbg(VFS, "Invalid command\n");
rc = -EINVAL;
}
}
if (rc)
goto finished;
/* We already have a handle so we can skip the close */
if (cfile)
goto after_close;
/* Close */
flags |= CIFS_CP_CREATE_CLOSE_OP;
rqst[num_rqst].rq_iov = &vars->close_iov;
rqst[num_rqst].rq_nvec = 1;
rc = SMB2_close_init(tcon, server,
&rqst[num_rqst], COMPOUND_FID,
COMPOUND_FID, false);
smb2_set_related(&rqst[num_rqst]);
if (rc)
goto finished;
after_close:
num_rqst++;
if (cfile) {
if (retries)
for (i = 1; i < num_rqst - 2; i++)
smb2_set_replay(server, &rqst[i]);
rc = compound_send_recv(xid, ses, server,
flags, num_rqst - 2,
&rqst[1], &resp_buftype[1],
&rsp_iov[1]);
} else {
if (retries)
for (i = 0; i < num_rqst; i++)
smb2_set_replay(server, &rqst[i]);
rc = compound_send_recv(xid, ses, server,
flags, num_rqst,
rqst, resp_buftype,
rsp_iov);
}
finished:
num_rqst = 0;
SMB2_open_free(&rqst[num_rqst++]);
if (rc == -EREMCHG) {
pr_warn_once("server share %s deleted\n", tcon->tree_name);
tcon->need_reconnect = true;
}
for (i = 0; i < num_cmds; i++) {
switch (cmds[i]) {
case SMB2_OP_QUERY_INFO:
idata = in_iov[i].iov_base;
if (rc == 0 && cfile && cfile->symlink_target) {
idata->symlink_target = kstrdup(cfile->symlink_target, GFP_KERNEL);
if (!idata->symlink_target)
rc = -ENOMEM;
}
if (rc == 0) {
qi_rsp = (struct smb2_query_info_rsp *)
rsp_iov[i + 1].iov_base;
rc = smb2_validate_and_copy_iov(
le16_to_cpu(qi_rsp->OutputBufferOffset),
le32_to_cpu(qi_rsp->OutputBufferLength),
&rsp_iov[i + 1], sizeof(idata->fi), (char *)&idata->fi);
}
SMB2_query_info_free(&rqst[num_rqst++]);
if (rc)
trace_smb3_query_info_compound_err(xid, ses->Suid,
tcon->tid, rc);
else
trace_smb3_query_info_compound_done(xid, ses->Suid,
tcon->tid);
break;
case SMB2_OP_POSIX_QUERY_INFO:
idata = in_iov[i].iov_base;
if (rc == 0 && cfile && cfile->symlink_target) {
idata->symlink_target = kstrdup(cfile->symlink_target, GFP_KERNEL);
if (!idata->symlink_target)
rc = -ENOMEM;
}
if (rc == 0) {
qi_rsp = (struct smb2_query_info_rsp *)
rsp_iov[i + 1].iov_base;
rc = smb2_validate_and_copy_iov(
le16_to_cpu(qi_rsp->OutputBufferOffset),
le32_to_cpu(qi_rsp->OutputBufferLength),
&rsp_iov[i + 1], sizeof(idata->posix_fi) /* add SIDs */,
(char *)&idata->posix_fi);
}
if (rc == 0)
rc = parse_posix_sids(idata, &rsp_iov[i + 1]);
SMB2_query_info_free(&rqst[num_rqst++]);
if (rc)
trace_smb3_posix_query_info_compound_err(xid, ses->Suid,
tcon->tid, rc);
else
trace_smb3_posix_query_info_compound_done(xid, ses->Suid,
tcon->tid);
break;
case SMB2_OP_DELETE:
if (rc)
trace_smb3_delete_err(xid, ses->Suid, tcon->tid, rc);
else {
/*
* If dentry (hence, inode) is NULL, lease break is going to
* take care of degrading leases on handles for deleted files.
*/
if (inode)
cifs_mark_open_handles_for_deleted_file(inode, full_path);
trace_smb3_delete_done(xid, ses->Suid, tcon->tid);
}
break;
case SMB2_OP_MKDIR:
if (rc)
trace_smb3_mkdir_err(xid, ses->Suid, tcon->tid, rc);
else
trace_smb3_mkdir_done(xid, ses->Suid, tcon->tid);
break;
case SMB2_OP_HARDLINK:
if (rc)
trace_smb3_hardlink_err(xid, ses->Suid, tcon->tid, rc);
else
trace_smb3_hardlink_done(xid, ses->Suid, tcon->tid);
SMB2_set_info_free(&rqst[num_rqst++]);
break;
case SMB2_OP_RENAME:
if (rc)
trace_smb3_rename_err(xid, ses->Suid, tcon->tid, rc);
else
trace_smb3_rename_done(xid, ses->Suid, tcon->tid);
SMB2_set_info_free(&rqst[num_rqst++]);
break;
case SMB2_OP_RMDIR:
if (rc)
trace_smb3_rmdir_err(xid, ses->Suid, tcon->tid, rc);
else
trace_smb3_rmdir_done(xid, ses->Suid, tcon->tid);
SMB2_set_info_free(&rqst[num_rqst++]);
break;
case SMB2_OP_SET_EOF:
if (rc)
trace_smb3_set_eof_err(xid, ses->Suid, tcon->tid, rc);
else
trace_smb3_set_eof_done(xid, ses->Suid, tcon->tid);
SMB2_set_info_free(&rqst[num_rqst++]);
break;
case SMB2_OP_SET_INFO:
if (rc)
trace_smb3_set_info_compound_err(xid, ses->Suid,
tcon->tid, rc);
else
trace_smb3_set_info_compound_done(xid, ses->Suid,
tcon->tid);
SMB2_set_info_free(&rqst[num_rqst++]);
break;
case SMB2_OP_SET_REPARSE:
if (rc) {
trace_smb3_set_reparse_compound_err(xid, ses->Suid,
tcon->tid, rc);
} else {
trace_smb3_set_reparse_compound_done(xid, ses->Suid,
tcon->tid);
}
SMB2_ioctl_free(&rqst[num_rqst++]);
break;
case SMB2_OP_GET_REPARSE:
if (!rc) {
iov = &rsp_iov[i + 1];
idata = in_iov[i].iov_base;
idata->reparse.io.iov = *iov;
idata->reparse.io.buftype = resp_buftype[i + 1];
rbuf = reparse_buf_ptr(iov);
if (IS_ERR(rbuf)) {
rc = PTR_ERR(rbuf);
trace_smb3_set_reparse_compound_err(xid, ses->Suid,
tcon->tid, rc);
} else {
idata->reparse.tag = le32_to_cpu(rbuf->ReparseTag);
trace_smb3_set_reparse_compound_done(xid, ses->Suid,
tcon->tid);
}
memset(iov, 0, sizeof(*iov));
resp_buftype[i + 1] = CIFS_NO_BUFFER;
} else {
trace_smb3_set_reparse_compound_err(xid, ses->Suid,
tcon->tid, rc);
}
SMB2_ioctl_free(&rqst[num_rqst++]);
break;
case SMB2_OP_QUERY_WSL_EA:
if (!rc) {
idata = in_iov[i].iov_base;
qi_rsp = rsp_iov[i + 1].iov_base;
data[0] = (u8 *)qi_rsp + le16_to_cpu(qi_rsp->OutputBufferOffset);
size[0] = le32_to_cpu(qi_rsp->OutputBufferLength);
rc = check_wsl_eas(&rsp_iov[i + 1]);
if (!rc) {
memcpy(idata->wsl.eas, data[0], size[0]);
idata->wsl.eas_len = size[0];
}
}
if (!rc) {
trace_smb3_query_wsl_ea_compound_done(xid, ses->Suid,
tcon->tid);
} else {
trace_smb3_query_wsl_ea_compound_err(xid, ses->Suid,
tcon->tid, rc);
}
SMB2_query_info_free(&rqst[num_rqst++]);
break;
}
}
SMB2_close_free(&rqst[num_rqst]);
num_cmds += 2;
if (out_iov && out_buftype) {
memcpy(out_iov, rsp_iov, num_cmds * sizeof(*out_iov));
memcpy(out_buftype, resp_buftype,
num_cmds * sizeof(*out_buftype));
} else {
for (i = 0; i < num_cmds; i++)
free_rsp_buf(resp_buftype[i], rsp_iov[i].iov_base);
}
num_cmds -= 2; /* correct num_cmds as there could be a retry */
kfree(vars);
if (is_replayable_error(rc) &&
smb2_should_replay(tcon, &retries, &cur_sleep))
goto replay_again;
if (cfile)
cifsFileInfo_put(cfile);
return rc;
}
static int parse_create_response(struct cifs_open_info_data *data,
struct cifs_sb_info *cifs_sb,
const struct kvec *iov)
{
struct smb2_create_rsp *rsp = iov->iov_base;
bool reparse_point = false;
u32 tag = 0;
int rc = 0;
switch (rsp->hdr.Status) {
case STATUS_IO_REPARSE_TAG_NOT_HANDLED:
reparse_point = true;
break;
case STATUS_STOPPED_ON_SYMLINK:
rc = smb2_parse_symlink_response(cifs_sb, iov,
&data->symlink_target);
if (rc)
return rc;
tag = IO_REPARSE_TAG_SYMLINK;
reparse_point = true;
break;
case STATUS_SUCCESS:
reparse_point = !!(rsp->Flags & SMB2_CREATE_FLAG_REPARSEPOINT);
break;
}
data->reparse_point = reparse_point;
data->reparse.tag = tag;
return rc;
}
int smb2_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)
{
struct cifs_open_parms oparms;
__u32 create_options = 0;
struct cifsFileInfo *cfile;
struct cached_fid *cfid = NULL;
struct smb2_hdr *hdr;
struct kvec in_iov[3], out_iov[3] = {};
int out_buftype[3] = {};
int cmds[3];
bool islink;
int i, num_cmds = 0;
int rc, rc2;
data->adjust_tz = false;
data->reparse_point = false;
/*
* BB TODO: Add support for using cached root handle in SMB3.1.1 POSIX.
* Create SMB2_query_posix_info worker function to do non-compounded
* query when we already have an open file handle for this. For now this
* is fast enough (always using the compounded version).
*/
if (!tcon->posix_extensions) {
if (*full_path) {
rc = -ENOENT;
} else {
rc = open_cached_dir(xid, tcon, full_path,
cifs_sb, false, &cfid);
}
/* If it is a root and its handle is cached then use it */
if (!rc) {
if (cfid->file_all_info_is_valid) {
memcpy(&data->fi, &cfid->file_all_info,
sizeof(data->fi));
} else {
rc = SMB2_query_info(xid, tcon,
cfid->fid.persistent_fid,
cfid->fid.volatile_fid,
&data->fi);
}
close_cached_dir(cfid);
return rc;
}
cmds[num_cmds++] = SMB2_OP_QUERY_INFO;
} else {
cmds[num_cmds++] = SMB2_OP_POSIX_QUERY_INFO;
}
in_iov[0].iov_base = data;
in_iov[0].iov_len = sizeof(*data);
in_iov[1] = in_iov[0];
in_iov[2] = in_iov[0];
cifs_get_readable_path(tcon, full_path, &cfile);
oparms = CIFS_OPARMS(cifs_sb, tcon, full_path, FILE_READ_ATTRIBUTES,
FILE_OPEN, create_options, ACL_NO_MODE);
rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
&oparms, in_iov, cmds, num_cmds,
cfile, out_iov, out_buftype, NULL);
hdr = out_iov[0].iov_base;
/*
* If first iov is unset, then SMB session was dropped or we've got a
* cached open file (@cfile).
*/
if (!hdr || out_buftype[0] == CIFS_NO_BUFFER)
goto out;
switch (rc) {
case 0:
rc = parse_create_response(data, cifs_sb, &out_iov[0]);
break;
case -EOPNOTSUPP:
/*
* BB TODO: When support for special files added to Samba
* re-verify this path.
*/
rc = parse_create_response(data, cifs_sb, &out_iov[0]);
if (rc || !data->reparse_point)
goto out;
cmds[num_cmds++] = SMB2_OP_QUERY_WSL_EA;
/*
* Skip SMB2_OP_GET_REPARSE if symlink already parsed in create
* response.
*/
if (data->reparse.tag != IO_REPARSE_TAG_SYMLINK)
cmds[num_cmds++] = SMB2_OP_GET_REPARSE;
oparms = CIFS_OPARMS(cifs_sb, tcon, full_path,
FILE_READ_ATTRIBUTES |
FILE_READ_EA | SYNCHRONIZE,
FILE_OPEN, create_options |
OPEN_REPARSE_POINT, ACL_NO_MODE);
cifs_get_readable_path(tcon, full_path, &cfile);
rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
&oparms, in_iov, cmds, num_cmds,
cfile, NULL, NULL, NULL);
break;
case -EREMOTE:
break;
default:
if (hdr->Status != STATUS_OBJECT_NAME_INVALID)
break;
rc2 = cifs_inval_name_dfs_link_error(xid, tcon, cifs_sb,
full_path, &islink);
if (rc2) {
rc = rc2;
goto out;
}
if (islink)
rc = -EREMOTE;
}
out:
for (i = 0; i < ARRAY_SIZE(out_buftype); i++)
free_rsp_buf(out_buftype[i], out_iov[i].iov_base);
return rc;
}
int
smb2_mkdir(const unsigned int xid, struct inode *parent_inode, umode_t mode,
struct cifs_tcon *tcon, const char *name,
struct cifs_sb_info *cifs_sb)
{
struct cifs_open_parms oparms;
oparms = CIFS_OPARMS(cifs_sb, tcon, name, FILE_WRITE_ATTRIBUTES,
FILE_CREATE, CREATE_NOT_FILE, mode);
return smb2_compound_op(xid, tcon, cifs_sb,
name, &oparms, NULL,
&(int){SMB2_OP_MKDIR}, 1,
NULL, NULL, NULL, NULL);
}
void
smb2_mkdir_setinfo(struct inode *inode, const char *name,
struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
const unsigned int xid)
{
struct cifs_open_parms oparms;
FILE_BASIC_INFO data = {};
struct cifsInodeInfo *cifs_i;
struct cifsFileInfo *cfile;
struct kvec in_iov;
u32 dosattrs;
int tmprc;
in_iov.iov_base = &data;
in_iov.iov_len = sizeof(data);
cifs_i = CIFS_I(inode);
dosattrs = cifs_i->cifsAttrs | ATTR_READONLY;
data.Attributes = cpu_to_le32(dosattrs);
cifs_get_writable_path(tcon, name, FIND_WR_ANY, &cfile);
oparms = CIFS_OPARMS(cifs_sb, tcon, name, FILE_WRITE_ATTRIBUTES,
FILE_CREATE, CREATE_NOT_FILE, ACL_NO_MODE);
tmprc = smb2_compound_op(xid, tcon, cifs_sb, name,
&oparms, &in_iov,
&(int){SMB2_OP_SET_INFO}, 1,
cfile, NULL, NULL, NULL);
if (tmprc == 0)
cifs_i->cifsAttrs = dosattrs;
}
int
smb2_rmdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
struct cifs_sb_info *cifs_sb)
{
struct cifs_open_parms oparms;
drop_cached_dir_by_name(xid, tcon, name, cifs_sb);
oparms = CIFS_OPARMS(cifs_sb, tcon, name, DELETE,
FILE_OPEN, CREATE_NOT_FILE, ACL_NO_MODE);
return smb2_compound_op(xid, tcon, cifs_sb,
name, &oparms, NULL,
&(int){SMB2_OP_RMDIR}, 1,
NULL, NULL, NULL, NULL);
}
int
smb2_unlink(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
struct cifs_sb_info *cifs_sb, struct dentry *dentry)
{
struct cifs_open_parms oparms;
oparms = CIFS_OPARMS(cifs_sb, tcon, name,
DELETE, FILE_OPEN,
CREATE_DELETE_ON_CLOSE | OPEN_REPARSE_POINT,
ACL_NO_MODE);
int rc = smb2_compound_op(xid, tcon, cifs_sb, name, &oparms,
NULL, &(int){SMB2_OP_DELETE}, 1,
NULL, NULL, NULL, dentry);
if (rc == -EINVAL) {
cifs_dbg(FYI, "invalid lease key, resending request without lease");
rc = smb2_compound_op(xid, tcon, cifs_sb, name, &oparms,
NULL, &(int){SMB2_OP_DELETE}, 1,
NULL, NULL, NULL, NULL);
}
return rc;
}
static int smb2_set_path_attr(const unsigned int xid, struct cifs_tcon *tcon,
const char *from_name, const char *to_name,
struct cifs_sb_info *cifs_sb,
__u32 create_options, __u32 access,
int command, struct cifsFileInfo *cfile,
struct dentry *dentry)
{
struct cifs_open_parms oparms;
struct kvec in_iov;
__le16 *smb2_to_name = NULL;
int rc;
smb2_to_name = cifs_convert_path_to_utf16(to_name, cifs_sb);
if (smb2_to_name == NULL) {
rc = -ENOMEM;
goto smb2_rename_path;
}
in_iov.iov_base = smb2_to_name;
in_iov.iov_len = 2 * UniStrnlen((wchar_t *)smb2_to_name, PATH_MAX);
oparms = CIFS_OPARMS(cifs_sb, tcon, from_name, access, FILE_OPEN,
create_options, ACL_NO_MODE);
rc = smb2_compound_op(xid, tcon, cifs_sb, from_name,
&oparms, &in_iov, &command, 1,
cfile, NULL, NULL, dentry);
smb2_rename_path:
kfree(smb2_to_name);
return rc;
}
int smb2_rename_path(const unsigned int xid,
struct cifs_tcon *tcon,
struct dentry *source_dentry,
const char *from_name, const char *to_name,
struct cifs_sb_info *cifs_sb)
{
struct cifsFileInfo *cfile;
__u32 co = file_create_options(source_dentry);
drop_cached_dir_by_name(xid, tcon, from_name, cifs_sb);
cifs_get_writable_path(tcon, from_name, FIND_WR_WITH_DELETE, &cfile);
int rc = smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
co, DELETE, SMB2_OP_RENAME, cfile, source_dentry);
if (rc == -EINVAL) {
cifs_dbg(FYI, "invalid lease key, resending request without lease");
cifs_get_writable_path(tcon, from_name,
FIND_WR_WITH_DELETE, &cfile);
rc = smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
co, DELETE, SMB2_OP_RENAME, cfile, NULL);
}
return rc;
}
int smb2_create_hardlink(const unsigned int xid,
struct cifs_tcon *tcon,
struct dentry *source_dentry,
const char *from_name, const char *to_name,
struct cifs_sb_info *cifs_sb)
{
__u32 co = file_create_options(source_dentry);
return smb2_set_path_attr(xid, tcon, from_name, to_name,
cifs_sb, co, FILE_READ_ATTRIBUTES,
SMB2_OP_HARDLINK, NULL, NULL);
}
int
smb2_set_path_size(const unsigned int xid, struct cifs_tcon *tcon,
const char *full_path, __u64 size,
struct cifs_sb_info *cifs_sb, bool set_alloc,
struct dentry *dentry)
{
struct cifs_open_parms oparms;
struct cifsFileInfo *cfile;
struct kvec in_iov;
__le64 eof = cpu_to_le64(size);
int rc;
in_iov.iov_base = &eof;
in_iov.iov_len = sizeof(eof);
cifs_get_writable_path(tcon, full_path, FIND_WR_ANY, &cfile);
oparms = CIFS_OPARMS(cifs_sb, tcon, full_path, FILE_WRITE_DATA,
FILE_OPEN, 0, ACL_NO_MODE);
rc = smb2_compound_op(xid, tcon, cifs_sb,
full_path, &oparms, &in_iov,
&(int){SMB2_OP_SET_EOF}, 1,
cfile, NULL, NULL, dentry);
if (rc == -EINVAL) {
cifs_dbg(FYI, "invalid lease key, resending request without lease");
cifs_get_writable_path(tcon, full_path, FIND_WR_ANY, &cfile);
rc = smb2_compound_op(xid, tcon, cifs_sb,
full_path, &oparms, &in_iov,
&(int){SMB2_OP_SET_EOF}, 1,
cfile, NULL, NULL, NULL);
}
return rc;
}
int
smb2_set_file_info(struct inode *inode, const char *full_path,
FILE_BASIC_INFO *buf, const unsigned int xid)
{
struct cifs_open_parms oparms;
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct tcon_link *tlink;
struct cifs_tcon *tcon;
struct cifsFileInfo *cfile;
struct kvec in_iov = { .iov_base = buf, .iov_len = sizeof(*buf), };
int rc;
if ((buf->CreationTime == 0) && (buf->LastAccessTime == 0) &&
(buf->LastWriteTime == 0) && (buf->ChangeTime == 0) &&
(buf->Attributes == 0))
return 0; /* would be a no op, no sense sending this */
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink))
return PTR_ERR(tlink);
tcon = tlink_tcon(tlink);
cifs_get_writable_path(tcon, full_path, FIND_WR_ANY, &cfile);
oparms = CIFS_OPARMS(cifs_sb, tcon, full_path, FILE_WRITE_ATTRIBUTES,
FILE_OPEN, 0, ACL_NO_MODE);
rc = smb2_compound_op(xid, tcon, cifs_sb,
full_path, &oparms, &in_iov,
&(int){SMB2_OP_SET_INFO}, 1,
cfile, NULL, NULL, NULL);
cifs_put_tlink(tlink);
return rc;
}
struct inode *smb2_get_reparse_inode(struct cifs_open_info_data *data,
struct super_block *sb,
const unsigned int xid,
struct cifs_tcon *tcon,
const char *full_path,
bool directory,
struct kvec *reparse_iov,
struct kvec *xattr_iov)
{
struct cifs_open_parms oparms;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
struct cifsFileInfo *cfile;
struct inode *new = NULL;
int out_buftype[4] = {};
struct kvec out_iov[4] = {};
struct kvec in_iov[2];
int cmds[2];
int rc;
int i;
oparms = CIFS_OPARMS(cifs_sb, tcon, full_path,
SYNCHRONIZE | DELETE |
FILE_READ_ATTRIBUTES |
FILE_WRITE_ATTRIBUTES,
FILE_CREATE,
(directory ? CREATE_NOT_FILE : CREATE_NOT_DIR) | OPEN_REPARSE_POINT,
ACL_NO_MODE);
if (xattr_iov)
oparms.ea_cctx = xattr_iov;
cmds[0] = SMB2_OP_SET_REPARSE;
in_iov[0] = *reparse_iov;
in_iov[1].iov_base = data;
in_iov[1].iov_len = sizeof(*data);
if (tcon->posix_extensions) {
cmds[1] = SMB2_OP_POSIX_QUERY_INFO;
cifs_get_writable_path(tcon, full_path, FIND_WR_ANY, &cfile);
rc = smb2_compound_op(xid, tcon, cifs_sb, full_path, &oparms,
in_iov, cmds, 2, cfile, out_iov, out_buftype, NULL);
if (!rc) {
rc = smb311_posix_get_inode_info(&new, full_path,
data, sb, xid);
}
} else {
cmds[1] = SMB2_OP_QUERY_INFO;
cifs_get_writable_path(tcon, full_path, FIND_WR_ANY, &cfile);
rc = smb2_compound_op(xid, tcon, cifs_sb, full_path, &oparms,
in_iov, cmds, 2, cfile, out_iov, out_buftype, NULL);
if (!rc) {
rc = cifs_get_inode_info(&new, full_path,
data, sb, xid, NULL);
}
}
/*
* If CREATE was successful but SMB2_OP_SET_REPARSE failed then
* remove the intermediate object created by CREATE. Otherwise
* empty object stay on the server when reparse call failed.
*/
if (rc &&
out_iov[0].iov_base != NULL && out_buftype[0] != CIFS_NO_BUFFER &&
((struct smb2_hdr *)out_iov[0].iov_base)->Status == STATUS_SUCCESS &&
(out_iov[1].iov_base == NULL || out_buftype[1] == CIFS_NO_BUFFER ||
((struct smb2_hdr *)out_iov[1].iov_base)->Status != STATUS_SUCCESS))
smb2_unlink(xid, tcon, full_path, cifs_sb, NULL);
for (i = 0; i < ARRAY_SIZE(out_buftype); i++)
free_rsp_buf(out_buftype[i], out_iov[i].iov_base);
return rc ? ERR_PTR(rc) : new;
}
int smb2_query_reparse_point(const unsigned int xid,
struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb,
const char *full_path,
u32 *tag, struct kvec *rsp,
int *rsp_buftype)
{
struct cifs_open_parms oparms;
struct cifs_open_info_data data = {};
struct cifsFileInfo *cfile;
struct kvec in_iov = { .iov_base = &data, .iov_len = sizeof(data), };
int rc;
cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
cifs_get_readable_path(tcon, full_path, &cfile);
oparms = CIFS_OPARMS(cifs_sb, tcon, full_path,
FILE_READ_ATTRIBUTES | FILE_READ_EA | SYNCHRONIZE,
FILE_OPEN, OPEN_REPARSE_POINT, ACL_NO_MODE);
rc = smb2_compound_op(xid, tcon, cifs_sb,
full_path, &oparms, &in_iov,
&(int){SMB2_OP_GET_REPARSE}, 1,
cfile, NULL, NULL, NULL);
if (rc)
goto out;
*tag = data.reparse.tag;
*rsp = data.reparse.io.iov;
*rsp_buftype = data.reparse.io.buftype;
memset(&data.reparse.io.iov, 0, sizeof(data.reparse.io.iov));
data.reparse.io.buftype = CIFS_NO_BUFFER;
out:
cifs_free_open_info(&data);
return rc;
}
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