| /* |
| * 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 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; |
| } |