![Joe Perches](/assets/img/avatar_default.png)
It's not obvious from reading the macro names that these macros are for debugging. Convert the names to a single more typical kernel style cifs_dbg macro. cERROR(1, ...) -> cifs_dbg(VFS, ...) cFYI(1, ...) -> cifs_dbg(FYI, ...) cFYI(DBG2, ...) -> cifs_dbg(NOISY, ...) Move the terminating format newline from the macro to the call site. Add CONFIG_CIFS_DEBUG function cifs_vfs_err to emit the "CIFS VFS: " prefix for VFS messages. Size is reduced ~ 1% when CONFIG_CIFS_DEBUG is set (default y) $ size fs/cifs/cifs.ko* text data bss dec hex filename 265245 2525 132 267902 4167e fs/cifs/cifs.ko.new 268359 2525 132 271016 422a8 fs/cifs/cifs.ko.old Other miscellaneous changes around these conversions: o Miscellaneous typo fixes o Add terminating \n's to almost all formats and remove them from the macros to be more kernel style like. A few formats previously had defective \n's o Remove unnecessary OOM messages as kmalloc() calls dump_stack o Coalesce formats to make grep easier, added missing spaces when coalescing formats o Use %s, __func__ instead of embedded function name o Removed unnecessary "cifs: " prefixes o Convert kzalloc with multiply to kcalloc o Remove unused cifswarn macro Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
623 lines
15 KiB
C
623 lines
15 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"
|
|
|
|
#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 \
|
|
"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n"
|
|
#define CIFS_MF_SYMLINK_MD5_ARGS(md5_hash) \
|
|
md5_hash[0], md5_hash[1], md5_hash[2], md5_hash[3], \
|
|
md5_hash[4], md5_hash[5], md5_hash[6], md5_hash[7], \
|
|
md5_hash[8], md5_hash[9], md5_hash[10], md5_hash[11],\
|
|
md5_hash[12], md5_hash[13], md5_hash[14], md5_hash[15]
|
|
|
|
static int
|
|
symlink_hash(unsigned int link_len, const char *link_str, u8 *md5_hash)
|
|
{
|
|
int rc;
|
|
unsigned int size;
|
|
struct crypto_shash *md5;
|
|
struct sdesc *sdescmd5;
|
|
|
|
md5 = crypto_alloc_shash("md5", 0, 0);
|
|
if (IS_ERR(md5)) {
|
|
rc = PTR_ERR(md5);
|
|
cifs_dbg(VFS, "%s: Crypto md5 allocation error %d\n",
|
|
__func__, rc);
|
|
return rc;
|
|
}
|
|
size = sizeof(struct shash_desc) + crypto_shash_descsize(md5);
|
|
sdescmd5 = kmalloc(size, GFP_KERNEL);
|
|
if (!sdescmd5) {
|
|
rc = -ENOMEM;
|
|
goto symlink_hash_err;
|
|
}
|
|
sdescmd5->shash.tfm = md5;
|
|
sdescmd5->shash.flags = 0x0;
|
|
|
|
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:
|
|
crypto_free_shash(md5);
|
|
kfree(sdescmd5);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
CIFSParseMFSymlink(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;
|
|
}
|
|
|
|
snprintf(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
|
|
CIFSFormatMFSymlink(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;
|
|
}
|
|
|
|
snprintf(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;
|
|
}
|
|
|
|
static int
|
|
CIFSCreateMFSymLink(const unsigned int xid, struct cifs_tcon *tcon,
|
|
const char *fromName, const char *toName,
|
|
struct cifs_sb_info *cifs_sb)
|
|
{
|
|
int rc;
|
|
int oplock = 0;
|
|
int remap;
|
|
int create_options = CREATE_NOT_DIR;
|
|
__u16 netfid = 0;
|
|
u8 *buf;
|
|
unsigned int bytes_written = 0;
|
|
struct cifs_io_parms io_parms;
|
|
struct nls_table *nls_codepage;
|
|
|
|
nls_codepage = cifs_sb->local_nls;
|
|
remap = cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR;
|
|
|
|
buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
rc = CIFSFormatMFSymlink(buf, CIFS_MF_SYMLINK_FILE_SIZE, toName);
|
|
if (rc != 0) {
|
|
kfree(buf);
|
|
return rc;
|
|
}
|
|
|
|
if (backup_cred(cifs_sb))
|
|
create_options |= CREATE_OPEN_BACKUP_INTENT;
|
|
|
|
rc = CIFSSMBOpen(xid, tcon, fromName, FILE_CREATE, GENERIC_WRITE,
|
|
create_options, &netfid, &oplock, NULL,
|
|
nls_codepage, remap);
|
|
if (rc != 0) {
|
|
kfree(buf);
|
|
return rc;
|
|
}
|
|
|
|
io_parms.netfid = 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, &bytes_written, buf, NULL, 0);
|
|
CIFSSMBClose(xid, tcon, netfid);
|
|
kfree(buf);
|
|
if (rc != 0)
|
|
return rc;
|
|
|
|
if (bytes_written != CIFS_MF_SYMLINK_FILE_SIZE)
|
|
return -EIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
CIFSQueryMFSymLink(const unsigned int xid, struct cifs_tcon *tcon,
|
|
const unsigned char *searchName, char **symlinkinfo,
|
|
const struct nls_table *nls_codepage, int remap)
|
|
{
|
|
int rc;
|
|
int oplock = 0;
|
|
__u16 netfid = 0;
|
|
u8 *buf;
|
|
char *pbuf;
|
|
unsigned int bytes_read = 0;
|
|
int buf_type = CIFS_NO_BUFFER;
|
|
unsigned int link_len = 0;
|
|
struct cifs_io_parms io_parms;
|
|
FILE_ALL_INFO file_info;
|
|
|
|
rc = CIFSSMBOpen(xid, tcon, searchName, FILE_OPEN, GENERIC_READ,
|
|
CREATE_NOT_DIR, &netfid, &oplock, &file_info,
|
|
nls_codepage, remap);
|
|
if (rc != 0)
|
|
return rc;
|
|
|
|
if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
|
|
CIFSSMBClose(xid, tcon, netfid);
|
|
/* it's not a symlink */
|
|
return -EINVAL;
|
|
}
|
|
|
|
buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
pbuf = buf;
|
|
io_parms.netfid = 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, &bytes_read, &pbuf, &buf_type);
|
|
CIFSSMBClose(xid, tcon, netfid);
|
|
if (rc != 0) {
|
|
kfree(buf);
|
|
return rc;
|
|
}
|
|
|
|
rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, symlinkinfo);
|
|
kfree(buf);
|
|
if (rc != 0)
|
|
return rc;
|
|
|
|
return 0;
|
|
}
|
|
|
|
bool
|
|
CIFSCouldBeMFSymlink(const struct cifs_fattr *fattr)
|
|
{
|
|
if (!(fattr->cf_mode & S_IFREG))
|
|
/* 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;
|
|
}
|
|
|
|
int
|
|
CIFSCheckMFSymlink(struct cifs_fattr *fattr,
|
|
const unsigned char *path,
|
|
struct cifs_sb_info *cifs_sb, unsigned int xid)
|
|
{
|
|
int rc;
|
|
int oplock = 0;
|
|
__u16 netfid = 0;
|
|
struct tcon_link *tlink;
|
|
struct cifs_tcon *pTcon;
|
|
struct cifs_io_parms io_parms;
|
|
u8 *buf;
|
|
char *pbuf;
|
|
unsigned int bytes_read = 0;
|
|
int buf_type = CIFS_NO_BUFFER;
|
|
unsigned int link_len = 0;
|
|
FILE_ALL_INFO file_info;
|
|
|
|
if (!CIFSCouldBeMFSymlink(fattr))
|
|
/* it's not a symlink */
|
|
return 0;
|
|
|
|
tlink = cifs_sb_tlink(cifs_sb);
|
|
if (IS_ERR(tlink))
|
|
return PTR_ERR(tlink);
|
|
pTcon = tlink_tcon(tlink);
|
|
|
|
rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
|
|
CREATE_NOT_DIR, &netfid, &oplock, &file_info,
|
|
cifs_sb->local_nls,
|
|
cifs_sb->mnt_cifs_flags &
|
|
CIFS_MOUNT_MAP_SPECIAL_CHR);
|
|
if (rc != 0)
|
|
goto out;
|
|
|
|
if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
|
|
CIFSSMBClose(xid, pTcon, netfid);
|
|
/* it's not a symlink */
|
|
goto out;
|
|
}
|
|
|
|
buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
|
|
if (!buf) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
pbuf = buf;
|
|
io_parms.netfid = netfid;
|
|
io_parms.pid = current->tgid;
|
|
io_parms.tcon = pTcon;
|
|
io_parms.offset = 0;
|
|
io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
|
|
|
|
rc = CIFSSMBRead(xid, &io_parms, &bytes_read, &pbuf, &buf_type);
|
|
CIFSSMBClose(xid, pTcon, netfid);
|
|
if (rc != 0) {
|
|
kfree(buf);
|
|
goto out;
|
|
}
|
|
|
|
rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, NULL);
|
|
kfree(buf);
|
|
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:
|
|
cifs_put_tlink(tlink);
|
|
return rc;
|
|
}
|
|
|
|
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_sb->mnt_cifs_flags &
|
|
CIFS_MOUNT_MAP_SPECIAL_CHR);
|
|
else {
|
|
server = tcon->ses->server;
|
|
if (!server->ops->create_hardlink)
|
|
return -ENOSYS;
|
|
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 (old_file->d_inode) {
|
|
cifsInode = CIFS_I(old_file->d_inode);
|
|
if (rc == 0) {
|
|
spin_lock(&old_file->d_inode->i_lock);
|
|
inc_nlink(old_file->d_inode);
|
|
spin_unlock(&old_file->d_inode->i_lock);
|
|
/*
|
|
* BB should we make this contingent on superblock flag
|
|
* NOATIME?
|
|
*/
|
|
/* old_file->d_inode->i_ctime = CURRENT_TIME; */
|
|
/*
|
|
* 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
|
|
*/
|
|
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;
|
|
}
|
|
|
|
void *
|
|
cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
|
|
{
|
|
struct inode *inode = direntry->d_inode;
|
|
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;
|
|
|
|
xid = get_xid();
|
|
|
|
tlink = cifs_sb_tlink(cifs_sb);
|
|
if (IS_ERR(tlink)) {
|
|
rc = PTR_ERR(tlink);
|
|
tlink = NULL;
|
|
goto out;
|
|
}
|
|
tcon = tlink_tcon(tlink);
|
|
|
|
/*
|
|
* For now, we just handle symlinks with unix extensions enabled.
|
|
* Eventually we should handle NTFS reparse points, and MacOS
|
|
* symlink support. For instance...
|
|
*
|
|
* rc = CIFSSMBQueryReparseLinkInfo(...)
|
|
*
|
|
* For now, just return -EACCES when the server doesn't support posix
|
|
* extensions. Note that we still allow querying symlinks when posix
|
|
* extensions are manually disabled. We could disable these as well
|
|
* but there doesn't seem to be any harm in allowing the client to
|
|
* read them.
|
|
*/
|
|
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
|
|
!cap_unix(tcon->ses)) {
|
|
rc = -EACCES;
|
|
goto out;
|
|
}
|
|
|
|
full_path = build_path_from_dentry(direntry);
|
|
if (!full_path)
|
|
goto out;
|
|
|
|
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 = CIFSQueryMFSymLink(xid, tcon, full_path, &target_path,
|
|
cifs_sb->local_nls,
|
|
cifs_sb->mnt_cifs_flags &
|
|
CIFS_MOUNT_MAP_SPECIAL_CHR);
|
|
|
|
if ((rc != 0) && cap_unix(tcon->ses))
|
|
rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,
|
|
cifs_sb->local_nls);
|
|
|
|
kfree(full_path);
|
|
out:
|
|
if (rc != 0) {
|
|
kfree(target_path);
|
|
target_path = ERR_PTR(rc);
|
|
}
|
|
|
|
free_xid(xid);
|
|
if (tlink)
|
|
cifs_put_tlink(tlink);
|
|
nd_set_link(nd, target_path);
|
|
return NULL;
|
|
}
|
|
|
|
int
|
|
cifs_symlink(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 = CIFSCreateMFSymLink(xid, pTcon, full_path, symname,
|
|
cifs_sb);
|
|
else if (pTcon->unix_ext)
|
|
rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
|
|
cifs_sb->local_nls);
|
|
/* else
|
|
rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,
|
|
cifs_sb_target->local_nls); */
|
|
|
|
if (rc == 0) {
|
|
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;
|
|
}
|
|
|
|
void cifs_put_link(struct dentry *direntry, struct nameidata *nd, void *cookie)
|
|
{
|
|
char *p = nd_get_link(nd);
|
|
if (!IS_ERR(p))
|
|
kfree(p);
|
|
}
|