mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Christian Brauner](/assets/img/avatar_default.png)
Extend some inode methods with an additional user namespace argument. A filesystem that is aware of idmapped mounts will receive the user namespace the mount has been marked with. This can be used for additional permission checking and also to enable filesystems to translate between uids and gids if they need to. We have implemented all relevant helpers in earlier patches. As requested we simply extend the exisiting inode method instead of introducing new ones. This is a little more code churn but it's mostly mechanical and doesnt't leave us with additional inode methods. Link: https://lore.kernel.org/r/20210121131959.646623-25-christian.brauner@ubuntu.com Cc: Christoph Hellwig <hch@lst.de> Cc: David Howells <dhowells@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
726 lines
17 KiB
C
726 lines
17 KiB
C
/*
|
|
* fs/cifs/link.c
|
|
*
|
|
* Copyright (C) International Business Machines Corp., 2002,2008
|
|
* Author(s): Steve French (sfrench@us.ibm.com)
|
|
*
|
|
* This library is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU Lesser General Public License as published
|
|
* by the Free Software Foundation; either version 2.1 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
|
|
* the GNU Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
#include <linux/fs.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/namei.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 "smb2proto.h"
|
|
|
|
/*
|
|
* M-F Symlink Functions - Begin
|
|
*/
|
|
|
|
#define CIFS_MF_SYMLINK_LEN_OFFSET (4+1)
|
|
#define CIFS_MF_SYMLINK_MD5_OFFSET (CIFS_MF_SYMLINK_LEN_OFFSET+(4+1))
|
|
#define CIFS_MF_SYMLINK_LINK_OFFSET (CIFS_MF_SYMLINK_MD5_OFFSET+(32+1))
|
|
#define CIFS_MF_SYMLINK_LINK_MAXLEN (1024)
|
|
#define CIFS_MF_SYMLINK_FILE_SIZE \
|
|
(CIFS_MF_SYMLINK_LINK_OFFSET + CIFS_MF_SYMLINK_LINK_MAXLEN)
|
|
|
|
#define CIFS_MF_SYMLINK_LEN_FORMAT "XSym\n%04u\n"
|
|
#define CIFS_MF_SYMLINK_MD5_FORMAT "%16phN\n"
|
|
#define CIFS_MF_SYMLINK_MD5_ARGS(md5_hash) md5_hash
|
|
|
|
static int
|
|
symlink_hash(unsigned int link_len, const char *link_str, u8 *md5_hash)
|
|
{
|
|
int rc;
|
|
struct crypto_shash *md5 = NULL;
|
|
struct sdesc *sdescmd5 = NULL;
|
|
|
|
rc = cifs_alloc_hash("md5", &md5, &sdescmd5);
|
|
if (rc)
|
|
goto symlink_hash_err;
|
|
|
|
rc = crypto_shash_init(&sdescmd5->shash);
|
|
if (rc) {
|
|
cifs_dbg(VFS, "%s: Could not init md5 shash\n", __func__);
|
|
goto symlink_hash_err;
|
|
}
|
|
rc = crypto_shash_update(&sdescmd5->shash, link_str, link_len);
|
|
if (rc) {
|
|
cifs_dbg(VFS, "%s: Could not update with link_str\n", __func__);
|
|
goto symlink_hash_err;
|
|
}
|
|
rc = crypto_shash_final(&sdescmd5->shash, md5_hash);
|
|
if (rc)
|
|
cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
|
|
|
|
symlink_hash_err:
|
|
cifs_free_hash(&md5, &sdescmd5);
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
parse_mf_symlink(const u8 *buf, unsigned int buf_len, unsigned int *_link_len,
|
|
char **_link_str)
|
|
{
|
|
int rc;
|
|
unsigned int link_len;
|
|
const char *md5_str1;
|
|
const char *link_str;
|
|
u8 md5_hash[16];
|
|
char md5_str2[34];
|
|
|
|
if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE)
|
|
return -EINVAL;
|
|
|
|
md5_str1 = (const char *)&buf[CIFS_MF_SYMLINK_MD5_OFFSET];
|
|
link_str = (const char *)&buf[CIFS_MF_SYMLINK_LINK_OFFSET];
|
|
|
|
rc = sscanf(buf, CIFS_MF_SYMLINK_LEN_FORMAT, &link_len);
|
|
if (rc != 1)
|
|
return -EINVAL;
|
|
|
|
rc = symlink_hash(link_len, link_str, md5_hash);
|
|
if (rc) {
|
|
cifs_dbg(FYI, "%s: MD5 hash failure: %d\n", __func__, rc);
|
|
return rc;
|
|
}
|
|
|
|
scnprintf(md5_str2, sizeof(md5_str2),
|
|
CIFS_MF_SYMLINK_MD5_FORMAT,
|
|
CIFS_MF_SYMLINK_MD5_ARGS(md5_hash));
|
|
|
|
if (strncmp(md5_str1, md5_str2, 17) != 0)
|
|
return -EINVAL;
|
|
|
|
if (_link_str) {
|
|
*_link_str = kstrndup(link_str, link_len, GFP_KERNEL);
|
|
if (!*_link_str)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
*_link_len = link_len;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
format_mf_symlink(u8 *buf, unsigned int buf_len, const char *link_str)
|
|
{
|
|
int rc;
|
|
unsigned int link_len;
|
|
unsigned int ofs;
|
|
u8 md5_hash[16];
|
|
|
|
if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE)
|
|
return -EINVAL;
|
|
|
|
link_len = strlen(link_str);
|
|
|
|
if (link_len > CIFS_MF_SYMLINK_LINK_MAXLEN)
|
|
return -ENAMETOOLONG;
|
|
|
|
rc = symlink_hash(link_len, link_str, md5_hash);
|
|
if (rc) {
|
|
cifs_dbg(FYI, "%s: MD5 hash failure: %d\n", __func__, rc);
|
|
return rc;
|
|
}
|
|
|
|
scnprintf(buf, buf_len,
|
|
CIFS_MF_SYMLINK_LEN_FORMAT CIFS_MF_SYMLINK_MD5_FORMAT,
|
|
link_len,
|
|
CIFS_MF_SYMLINK_MD5_ARGS(md5_hash));
|
|
|
|
ofs = CIFS_MF_SYMLINK_LINK_OFFSET;
|
|
memcpy(buf + ofs, link_str, link_len);
|
|
|
|
ofs += link_len;
|
|
if (ofs < CIFS_MF_SYMLINK_FILE_SIZE) {
|
|
buf[ofs] = '\n';
|
|
ofs++;
|
|
}
|
|
|
|
while (ofs < CIFS_MF_SYMLINK_FILE_SIZE) {
|
|
buf[ofs] = ' ';
|
|
ofs++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
bool
|
|
couldbe_mf_symlink(const struct cifs_fattr *fattr)
|
|
{
|
|
if (!S_ISREG(fattr->cf_mode))
|
|
/* it's not a symlink */
|
|
return false;
|
|
|
|
if (fattr->cf_eof != CIFS_MF_SYMLINK_FILE_SIZE)
|
|
/* it's not a symlink */
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static int
|
|
create_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon,
|
|
struct cifs_sb_info *cifs_sb, const char *fromName,
|
|
const char *toName)
|
|
{
|
|
int rc;
|
|
u8 *buf;
|
|
unsigned int bytes_written = 0;
|
|
|
|
buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
rc = format_mf_symlink(buf, CIFS_MF_SYMLINK_FILE_SIZE, toName);
|
|
if (rc)
|
|
goto out;
|
|
|
|
if (tcon->ses->server->ops->create_mf_symlink)
|
|
rc = tcon->ses->server->ops->create_mf_symlink(xid, tcon,
|
|
cifs_sb, fromName, buf, &bytes_written);
|
|
else
|
|
rc = -EOPNOTSUPP;
|
|
|
|
if (rc)
|
|
goto out;
|
|
|
|
if (bytes_written != CIFS_MF_SYMLINK_FILE_SIZE)
|
|
rc = -EIO;
|
|
out:
|
|
kfree(buf);
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
query_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon,
|
|
struct cifs_sb_info *cifs_sb, const unsigned char *path,
|
|
char **symlinkinfo)
|
|
{
|
|
int rc;
|
|
u8 *buf = NULL;
|
|
unsigned int link_len = 0;
|
|
unsigned int bytes_read = 0;
|
|
|
|
buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
if (tcon->ses->server->ops->query_mf_symlink)
|
|
rc = tcon->ses->server->ops->query_mf_symlink(xid, tcon,
|
|
cifs_sb, path, buf, &bytes_read);
|
|
else
|
|
rc = -ENOSYS;
|
|
|
|
if (rc)
|
|
goto out;
|
|
|
|
if (bytes_read == 0) { /* not a symlink */
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
rc = parse_mf_symlink(buf, bytes_read, &link_len, symlinkinfo);
|
|
out:
|
|
kfree(buf);
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
check_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
|
|
struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
|
|
const unsigned char *path)
|
|
{
|
|
int rc;
|
|
u8 *buf = NULL;
|
|
unsigned int link_len = 0;
|
|
unsigned int bytes_read = 0;
|
|
|
|
if (!couldbe_mf_symlink(fattr))
|
|
/* it's not a symlink */
|
|
return 0;
|
|
|
|
buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
if (tcon->ses->server->ops->query_mf_symlink)
|
|
rc = tcon->ses->server->ops->query_mf_symlink(xid, tcon,
|
|
cifs_sb, path, buf, &bytes_read);
|
|
else
|
|
rc = -ENOSYS;
|
|
|
|
if (rc)
|
|
goto out;
|
|
|
|
if (bytes_read == 0) /* not a symlink */
|
|
goto out;
|
|
|
|
rc = parse_mf_symlink(buf, bytes_read, &link_len, NULL);
|
|
if (rc == -EINVAL) {
|
|
/* it's not a symlink */
|
|
rc = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (rc != 0)
|
|
goto out;
|
|
|
|
/* it is a symlink */
|
|
fattr->cf_eof = link_len;
|
|
fattr->cf_mode &= ~S_IFMT;
|
|
fattr->cf_mode |= S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO;
|
|
fattr->cf_dtype = DT_LNK;
|
|
out:
|
|
kfree(buf);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* SMB 1.0 Protocol specific functions
|
|
*/
|
|
|
|
int
|
|
cifs_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
|
|
struct cifs_sb_info *cifs_sb, const unsigned char *path,
|
|
char *pbuf, unsigned int *pbytes_read)
|
|
{
|
|
int rc;
|
|
int oplock = 0;
|
|
struct cifs_fid fid;
|
|
struct cifs_open_parms oparms;
|
|
struct cifs_io_parms io_parms = {0};
|
|
int buf_type = CIFS_NO_BUFFER;
|
|
FILE_ALL_INFO file_info;
|
|
|
|
oparms.tcon = tcon;
|
|
oparms.cifs_sb = cifs_sb;
|
|
oparms.desired_access = GENERIC_READ;
|
|
oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
|
|
oparms.disposition = FILE_OPEN;
|
|
oparms.path = path;
|
|
oparms.fid = &fid;
|
|
oparms.reconnect = false;
|
|
|
|
rc = CIFS_open(xid, &oparms, &oplock, &file_info);
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
|
|
rc = -ENOENT;
|
|
/* it's not a symlink */
|
|
goto out;
|
|
}
|
|
|
|
io_parms.netfid = fid.netfid;
|
|
io_parms.pid = current->tgid;
|
|
io_parms.tcon = tcon;
|
|
io_parms.offset = 0;
|
|
io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
|
|
|
|
rc = CIFSSMBRead(xid, &io_parms, pbytes_read, &pbuf, &buf_type);
|
|
out:
|
|
CIFSSMBClose(xid, tcon, fid.netfid);
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
cifs_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
|
|
struct cifs_sb_info *cifs_sb, const unsigned char *path,
|
|
char *pbuf, unsigned int *pbytes_written)
|
|
{
|
|
int rc;
|
|
int oplock = 0;
|
|
struct cifs_fid fid;
|
|
struct cifs_open_parms oparms;
|
|
struct cifs_io_parms io_parms = {0};
|
|
|
|
oparms.tcon = tcon;
|
|
oparms.cifs_sb = cifs_sb;
|
|
oparms.desired_access = GENERIC_WRITE;
|
|
oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
|
|
oparms.disposition = FILE_CREATE;
|
|
oparms.path = path;
|
|
oparms.fid = &fid;
|
|
oparms.reconnect = false;
|
|
|
|
rc = CIFS_open(xid, &oparms, &oplock, NULL);
|
|
if (rc)
|
|
return rc;
|
|
|
|
io_parms.netfid = fid.netfid;
|
|
io_parms.pid = current->tgid;
|
|
io_parms.tcon = tcon;
|
|
io_parms.offset = 0;
|
|
io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
|
|
|
|
rc = CIFSSMBWrite(xid, &io_parms, pbytes_written, pbuf);
|
|
CIFSSMBClose(xid, tcon, fid.netfid);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* SMB 2.1/SMB3 Protocol specific functions
|
|
*/
|
|
int
|
|
smb3_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
|
|
struct cifs_sb_info *cifs_sb, const unsigned char *path,
|
|
char *pbuf, unsigned int *pbytes_read)
|
|
{
|
|
int rc;
|
|
struct cifs_fid fid;
|
|
struct cifs_open_parms oparms;
|
|
struct cifs_io_parms io_parms = {0};
|
|
int buf_type = CIFS_NO_BUFFER;
|
|
__le16 *utf16_path;
|
|
__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
|
|
struct smb2_file_all_info *pfile_info = NULL;
|
|
|
|
oparms.tcon = tcon;
|
|
oparms.cifs_sb = cifs_sb;
|
|
oparms.desired_access = GENERIC_READ;
|
|
oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
|
|
oparms.disposition = FILE_OPEN;
|
|
oparms.fid = &fid;
|
|
oparms.reconnect = false;
|
|
|
|
utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
|
|
if (utf16_path == NULL)
|
|
return -ENOMEM;
|
|
|
|
pfile_info = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
|
|
GFP_KERNEL);
|
|
|
|
if (pfile_info == NULL) {
|
|
kfree(utf16_path);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
rc = SMB2_open(xid, &oparms, utf16_path, &oplock, pfile_info, NULL,
|
|
NULL, NULL);
|
|
if (rc)
|
|
goto qmf_out_open_fail;
|
|
|
|
if (pfile_info->EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
|
|
/* it's not a symlink */
|
|
rc = -ENOENT; /* Is there a better rc to return? */
|
|
goto qmf_out;
|
|
}
|
|
|
|
io_parms.netfid = fid.netfid;
|
|
io_parms.pid = current->tgid;
|
|
io_parms.tcon = tcon;
|
|
io_parms.offset = 0;
|
|
io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
|
|
io_parms.persistent_fid = fid.persistent_fid;
|
|
io_parms.volatile_fid = fid.volatile_fid;
|
|
rc = SMB2_read(xid, &io_parms, pbytes_read, &pbuf, &buf_type);
|
|
qmf_out:
|
|
SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
|
|
qmf_out_open_fail:
|
|
kfree(utf16_path);
|
|
kfree(pfile_info);
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
smb3_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
|
|
struct cifs_sb_info *cifs_sb, const unsigned char *path,
|
|
char *pbuf, unsigned int *pbytes_written)
|
|
{
|
|
int rc;
|
|
struct cifs_fid fid;
|
|
struct cifs_open_parms oparms;
|
|
struct cifs_io_parms io_parms = {0};
|
|
__le16 *utf16_path;
|
|
__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
|
|
struct kvec iov[2];
|
|
|
|
cifs_dbg(FYI, "%s: path: %s\n", __func__, path);
|
|
|
|
utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
|
|
if (!utf16_path)
|
|
return -ENOMEM;
|
|
|
|
oparms.tcon = tcon;
|
|
oparms.cifs_sb = cifs_sb;
|
|
oparms.desired_access = GENERIC_WRITE;
|
|
oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
|
|
oparms.disposition = FILE_CREATE;
|
|
oparms.fid = &fid;
|
|
oparms.reconnect = false;
|
|
|
|
rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL,
|
|
NULL, NULL);
|
|
if (rc) {
|
|
kfree(utf16_path);
|
|
return rc;
|
|
}
|
|
|
|
io_parms.netfid = fid.netfid;
|
|
io_parms.pid = current->tgid;
|
|
io_parms.tcon = tcon;
|
|
io_parms.offset = 0;
|
|
io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
|
|
io_parms.persistent_fid = fid.persistent_fid;
|
|
io_parms.volatile_fid = fid.volatile_fid;
|
|
|
|
/* iov[0] is reserved for smb header */
|
|
iov[1].iov_base = pbuf;
|
|
iov[1].iov_len = CIFS_MF_SYMLINK_FILE_SIZE;
|
|
|
|
rc = SMB2_write(xid, &io_parms, pbytes_written, iov, 1);
|
|
|
|
/* Make sure we wrote all of the symlink data */
|
|
if ((rc == 0) && (*pbytes_written != CIFS_MF_SYMLINK_FILE_SIZE))
|
|
rc = -EIO;
|
|
|
|
SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
|
|
|
|
kfree(utf16_path);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* M-F Symlink Functions - End
|
|
*/
|
|
|
|
int
|
|
cifs_hardlink(struct dentry *old_file, struct inode *inode,
|
|
struct dentry *direntry)
|
|
{
|
|
int rc = -EACCES;
|
|
unsigned int xid;
|
|
char *from_name = NULL;
|
|
char *to_name = NULL;
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
|
|
struct tcon_link *tlink;
|
|
struct cifs_tcon *tcon;
|
|
struct TCP_Server_Info *server;
|
|
struct cifsInodeInfo *cifsInode;
|
|
|
|
tlink = cifs_sb_tlink(cifs_sb);
|
|
if (IS_ERR(tlink))
|
|
return PTR_ERR(tlink);
|
|
tcon = tlink_tcon(tlink);
|
|
|
|
xid = get_xid();
|
|
|
|
from_name = build_path_from_dentry(old_file);
|
|
to_name = build_path_from_dentry(direntry);
|
|
if ((from_name == NULL) || (to_name == NULL)) {
|
|
rc = -ENOMEM;
|
|
goto cifs_hl_exit;
|
|
}
|
|
|
|
if (tcon->unix_ext)
|
|
rc = CIFSUnixCreateHardLink(xid, tcon, from_name, to_name,
|
|
cifs_sb->local_nls,
|
|
cifs_remap(cifs_sb));
|
|
else {
|
|
server = tcon->ses->server;
|
|
if (!server->ops->create_hardlink) {
|
|
rc = -ENOSYS;
|
|
goto cifs_hl_exit;
|
|
}
|
|
rc = server->ops->create_hardlink(xid, tcon, from_name, to_name,
|
|
cifs_sb);
|
|
if ((rc == -EIO) || (rc == -EINVAL))
|
|
rc = -EOPNOTSUPP;
|
|
}
|
|
|
|
d_drop(direntry); /* force new lookup from server of target */
|
|
|
|
/*
|
|
* if source file is cached (oplocked) revalidate will not go to server
|
|
* until the file is closed or oplock broken so update nlinks locally
|
|
*/
|
|
if (d_really_is_positive(old_file)) {
|
|
cifsInode = CIFS_I(d_inode(old_file));
|
|
if (rc == 0) {
|
|
spin_lock(&d_inode(old_file)->i_lock);
|
|
inc_nlink(d_inode(old_file));
|
|
spin_unlock(&d_inode(old_file)->i_lock);
|
|
|
|
/*
|
|
* parent dir timestamps will update from srv within a
|
|
* second, would it really be worth it to set the parent
|
|
* dir cifs inode time to zero to force revalidate
|
|
* (faster) for it too?
|
|
*/
|
|
}
|
|
/*
|
|
* if not oplocked will force revalidate to get info on source
|
|
* file from srv. Note Samba server prior to 4.2 has bug -
|
|
* not updating src file ctime on hardlinks but Windows servers
|
|
* handle it properly
|
|
*/
|
|
cifsInode->time = 0;
|
|
|
|
/*
|
|
* Will update parent dir timestamps from srv within a second.
|
|
* Would it really be worth it to set the parent dir (cifs
|
|
* inode) time field to zero to force revalidate on parent
|
|
* directory faster ie
|
|
*
|
|
* CIFS_I(inode)->time = 0;
|
|
*/
|
|
}
|
|
|
|
cifs_hl_exit:
|
|
kfree(from_name);
|
|
kfree(to_name);
|
|
free_xid(xid);
|
|
cifs_put_tlink(tlink);
|
|
return rc;
|
|
}
|
|
|
|
const char *
|
|
cifs_get_link(struct dentry *direntry, struct inode *inode,
|
|
struct delayed_call *done)
|
|
{
|
|
int rc = -ENOMEM;
|
|
unsigned int xid;
|
|
char *full_path = NULL;
|
|
char *target_path = NULL;
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
|
|
struct tcon_link *tlink = NULL;
|
|
struct cifs_tcon *tcon;
|
|
struct TCP_Server_Info *server;
|
|
|
|
if (!direntry)
|
|
return ERR_PTR(-ECHILD);
|
|
|
|
xid = get_xid();
|
|
|
|
tlink = cifs_sb_tlink(cifs_sb);
|
|
if (IS_ERR(tlink)) {
|
|
free_xid(xid);
|
|
return ERR_CAST(tlink);
|
|
}
|
|
tcon = tlink_tcon(tlink);
|
|
server = tcon->ses->server;
|
|
|
|
full_path = build_path_from_dentry(direntry);
|
|
if (!full_path) {
|
|
free_xid(xid);
|
|
cifs_put_tlink(tlink);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
cifs_dbg(FYI, "Full path: %s inode = 0x%p\n", full_path, inode);
|
|
|
|
rc = -EACCES;
|
|
/*
|
|
* First try Minshall+French Symlinks, if configured
|
|
* and fallback to UNIX Extensions Symlinks.
|
|
*/
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
|
|
rc = query_mf_symlink(xid, tcon, cifs_sb, full_path,
|
|
&target_path);
|
|
|
|
if (rc != 0 && server->ops->query_symlink) {
|
|
struct cifsInodeInfo *cifsi = CIFS_I(inode);
|
|
bool reparse_point = false;
|
|
|
|
if (cifsi->cifsAttrs & ATTR_REPARSE)
|
|
reparse_point = true;
|
|
|
|
rc = server->ops->query_symlink(xid, tcon, cifs_sb, full_path,
|
|
&target_path, reparse_point);
|
|
}
|
|
|
|
kfree(full_path);
|
|
free_xid(xid);
|
|
cifs_put_tlink(tlink);
|
|
if (rc != 0) {
|
|
kfree(target_path);
|
|
return ERR_PTR(rc);
|
|
}
|
|
set_delayed_call(done, kfree_link, target_path);
|
|
return target_path;
|
|
}
|
|
|
|
int
|
|
cifs_symlink(struct user_namespace *mnt_userns, struct inode *inode,
|
|
struct dentry *direntry, const char *symname)
|
|
{
|
|
int rc = -EOPNOTSUPP;
|
|
unsigned int xid;
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
|
|
struct tcon_link *tlink;
|
|
struct cifs_tcon *pTcon;
|
|
char *full_path = NULL;
|
|
struct inode *newinode = NULL;
|
|
|
|
xid = get_xid();
|
|
|
|
tlink = cifs_sb_tlink(cifs_sb);
|
|
if (IS_ERR(tlink)) {
|
|
rc = PTR_ERR(tlink);
|
|
goto symlink_exit;
|
|
}
|
|
pTcon = tlink_tcon(tlink);
|
|
|
|
full_path = build_path_from_dentry(direntry);
|
|
if (full_path == NULL) {
|
|
rc = -ENOMEM;
|
|
goto symlink_exit;
|
|
}
|
|
|
|
cifs_dbg(FYI, "Full path: %s\n", full_path);
|
|
cifs_dbg(FYI, "symname is %s\n", symname);
|
|
|
|
/* BB what if DFS and this volume is on different share? BB */
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
|
|
rc = create_mf_symlink(xid, pTcon, cifs_sb, full_path, symname);
|
|
else if (pTcon->unix_ext)
|
|
rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
|
|
cifs_sb->local_nls,
|
|
cifs_remap(cifs_sb));
|
|
/* else
|
|
rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,
|
|
cifs_sb_target->local_nls); */
|
|
|
|
if (rc == 0) {
|
|
if (pTcon->posix_extensions)
|
|
rc = smb311_posix_get_inode_info(&newinode, full_path, inode->i_sb, xid);
|
|
else if (pTcon->unix_ext)
|
|
rc = cifs_get_inode_info_unix(&newinode, full_path,
|
|
inode->i_sb, xid);
|
|
else
|
|
rc = cifs_get_inode_info(&newinode, full_path, NULL,
|
|
inode->i_sb, xid, NULL);
|
|
|
|
if (rc != 0) {
|
|
cifs_dbg(FYI, "Create symlink ok, getinodeinfo fail rc = %d\n",
|
|
rc);
|
|
} else {
|
|
d_instantiate(direntry, newinode);
|
|
}
|
|
}
|
|
symlink_exit:
|
|
kfree(full_path);
|
|
cifs_put_tlink(tlink);
|
|
free_xid(xid);
|
|
return rc;
|
|
}
|