Release 4.11 fs/cifs/link.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"
#ifdef CONFIG_CIFS_SMB2
#include "smb2proto.h"
#endif
/*
* 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;
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Steve French | 181 | 78.70% | 1 | 20.00% |
| Shirish Pargaonkar | 27 | 11.74% | 1 | 20.00% |
| Joe Perches | 12 | 5.22% | 1 | 20.00% |
| Jeff Layton | 8 | 3.48% | 1 | 20.00% |
| Stefan Metzmacher | 2 | 0.87% | 1 | 20.00% |
| Total | 230 | 100.00% | 5 | 100.00% |
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;
}
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Stefan Metzmacher | 189 | 88.73% | 2 | 40.00% |
| Steve French | 20 | 9.39% | 1 | 20.00% |
| Joe Perches | 3 | 1.41% | 1 | 20.00% |
| Sachin S. Prabhu | 1 | 0.47% | 1 | 20.00% |
| Total | 213 | 100.00% | 5 | 100.00% |
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;
}
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Stefan Metzmacher | 140 | 84.85% | 2 | 40.00% |
| Steve French | 21 | 12.73% | 1 | 20.00% |
| Joe Perches | 3 | 1.82% | 1 | 20.00% |
| Sachin S. Prabhu | 1 | 0.61% | 1 | 20.00% |
| Total | 165 | 100.00% | 5 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Sachin S. Prabhu | 40 | 100.00% | 2 | 100.00% |
| Total | 40 | 100.00% | 2 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Stefan Metzmacher | 97 | 63.82% | 2 | 28.57% |
| Sachin S. Prabhu | 35 | 23.03% | 2 | 28.57% |
| Steve French | 19 | 12.50% | 2 | 28.57% |
| Pavel Shilovsky | 1 | 0.66% | 1 | 14.29% |
| Total | 152 | 100.00% | 7 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Stefan Metzmacher | 99 | 60.74% | 3 | 37.50% |
| Sachin S. Prabhu | 61 | 37.42% | 2 | 25.00% |
| Pavel Shilovsky | 2 | 1.23% | 2 | 25.00% |
| Steve French | 1 | 0.61% | 1 | 12.50% |
| Total | 163 | 100.00% | 8 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Sachin S. Prabhu | 201 | 89.73% | 1 | 50.00% |
| Stefan Metzmacher | 23 | 10.27% | 1 | 50.00% |
| Total | 224 | 100.00% | 2 | 100.00% |
/*
* 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;
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 = 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Pavel Shilovsky | 98 | 43.75% | 2 | 28.57% |
| Stefan Metzmacher | 76 | 33.93% | 1 | 14.29% |
| Steve French | 27 | 12.05% | 3 | 42.86% |
| Sachin S. Prabhu | 23 | 10.27% | 1 | 14.29% |
| Total | 224 | 100.00% | 7 | 100.00% |
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;
int create_options = CREATE_NOT_DIR;
if (backup_cred(cifs_sb))
create_options |= CREATE_OPEN_BACKUP_INTENT;
oparms.tcon = tcon;
oparms.cifs_sb = cifs_sb;
oparms.desired_access = GENERIC_WRITE;
oparms.create_options = create_options;
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Sachin S. Prabhu | 140 | 68.97% | 1 | 25.00% |
| Pavel Shilovsky | 61 | 30.05% | 1 | 25.00% |
| Steve French | 1 | 0.49% | 1 | 25.00% |
| Björn Baumbach | 1 | 0.49% | 1 | 25.00% |
| Total | 203 | 100.00% | 4 | 100.00% |
/*
* SMB 2.1/SMB3 Protocol specific functions
*/
#ifdef CONFIG_CIFS_SMB2
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;
int buf_type = CIFS_NO_BUFFER;
__le16 *utf16_path;
__u8 oplock = SMB2_OPLOCK_LEVEL_II;
struct smb2_file_all_info *pfile_info = NULL;
oparms.tcon = tcon;
oparms.cifs_sb = cifs_sb;
oparms.desired_access = GENERIC_READ;
oparms.create_options = CREATE_NOT_DIR;
if (backup_cred(cifs_sb))
oparms.create_options |= CREATE_OPEN_BACKUP_INTENT;
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);
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Steve French | 328 | 100.00% | 1 | 100.00% |
| Total | 328 | 100.00% | 1 | 100.00% |
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;
int create_options = CREATE_NOT_DIR;
__le16 *utf16_path;
__u8 oplock = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
struct kvec iov[2];
if (backup_cred(cifs_sb))
create_options |= CREATE_OPEN_BACKUP_INTENT;
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 = create_options;
oparms.disposition = FILE_CREATE;
oparms.fid = &fid;
oparms.reconnect = false;
rc = SMB2_open(xid, &oparms, utf16_path, &oplock, 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Steve French | 315 | 100.00% | 1 | 100.00% |
| Total | 315 | 100.00% | 1 | 100.00% |
#endif /* CONFIG_CIFS_SMB2 */
/*
* 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Steve French | 266 | 78.24% | 12 | 66.67% |
| Jeff Layton | 45 | 13.24% | 2 | 11.11% |
| David Howells | 15 | 4.41% | 1 | 5.56% |
| Christian Engelmayer | 8 | 2.35% | 1 | 5.56% |
| Pavel Shilovsky | 3 | 0.88% | 1 | 5.56% |
| Miklos Szeredi | 3 | 0.88% | 1 | 5.56% |
| Total | 340 | 100.00% | 18 | 100.00% |
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)
rc = server->ops->query_symlink(xid, tcon, full_path,
&target_path, cifs_sb);
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Al Viro | 77 | 27.30% | 4 | 21.05% |
| Steve French | 74 | 26.24% | 4 | 21.05% |
| Jeff Layton | 54 | 19.15% | 3 | 15.79% |
| Pavel Shilovsky | 41 | 14.54% | 2 | 10.53% |
| Stefan Metzmacher | 27 | 9.57% | 1 | 5.26% |
| Joe Perches | 5 | 1.77% | 2 | 10.53% |
| Sachin S. Prabhu | 3 | 1.06% | 2 | 10.53% |
| Linus Torvalds | 1 | 0.35% | 1 | 5.26% |
| Total | 282 | 100.00% | 19 | 100.00% |
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 = 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->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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Steve French | 200 | 67.57% | 8 | 44.44% |
| Jeff Layton | 47 | 15.88% | 2 | 11.11% |
| Stefan Metzmacher | 21 | 7.09% | 1 | 5.56% |
| Joe Perches | 12 | 4.05% | 2 | 11.11% |
| Suresh Jayaraman | 5 | 1.69% | 1 | 5.56% |
| Nakajima Akira | 5 | 1.69% | 1 | 5.56% |
| Sachin S. Prabhu | 3 | 1.01% | 2 | 11.11% |
| Pavel Shilovsky | 3 | 1.01% | 1 | 5.56% |
| Total | 296 | 100.00% | 18 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Steve French | 1496 | 45.85% | 25 | 40.32% |
| Stefan Metzmacher | 708 | 21.70% | 6 | 9.68% |
| Sachin S. Prabhu | 511 | 15.66% | 6 | 9.68% |
| Pavel Shilovsky | 209 | 6.41% | 4 | 6.45% |
| Jeff Layton | 154 | 4.72% | 5 | 8.06% |
| Al Viro | 80 | 2.45% | 4 | 6.45% |
| Joe Perches | 35 | 1.07% | 2 | 3.23% |
| Shirish Pargaonkar | 27 | 0.83% | 1 | 1.61% |
| David Howells | 15 | 0.46% | 1 | 1.61% |
| Christian Engelmayer | 8 | 0.25% | 1 | 1.61% |
| Nakajima Akira | 5 | 0.15% | 1 | 1.61% |
| Suresh Jayaraman | 5 | 0.15% | 1 | 1.61% |
| Miklos Szeredi | 3 | 0.09% | 1 | 1.61% |
| Tejun Heo | 3 | 0.09% | 1 | 1.61% |
| Rasmus Villemoes | 2 | 0.06% | 1 | 1.61% |
| Björn Baumbach | 1 | 0.03% | 1 | 1.61% |
| Linus Torvalds | 1 | 0.03% | 1 | 1.61% |
| Total | 3263 | 100.00% | 62 | 100.00% |
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