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6d6b77f163
Replace direct i_nlink updates with the respective updater function (inc_nlink, drop_nlink, clear_nlink, inode_dec_link_count). Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
607 lines
15 KiB
C
607 lines
15 KiB
C
/*
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* fs/cifs/link.c
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*
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* Copyright (C) International Business Machines Corp., 2002,2008
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include <linux/stat.h>
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#include <linux/slab.h>
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#include <linux/namei.h>
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#include "cifsfs.h"
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#include "cifspdu.h"
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "cifs_debug.h"
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#include "cifs_fs_sb.h"
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#define CIFS_MF_SYMLINK_LEN_OFFSET (4+1)
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#define CIFS_MF_SYMLINK_MD5_OFFSET (CIFS_MF_SYMLINK_LEN_OFFSET+(4+1))
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#define CIFS_MF_SYMLINK_LINK_OFFSET (CIFS_MF_SYMLINK_MD5_OFFSET+(32+1))
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#define CIFS_MF_SYMLINK_LINK_MAXLEN (1024)
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#define CIFS_MF_SYMLINK_FILE_SIZE \
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(CIFS_MF_SYMLINK_LINK_OFFSET + CIFS_MF_SYMLINK_LINK_MAXLEN)
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#define CIFS_MF_SYMLINK_LEN_FORMAT "XSym\n%04u\n"
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#define CIFS_MF_SYMLINK_MD5_FORMAT \
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"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n"
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#define CIFS_MF_SYMLINK_MD5_ARGS(md5_hash) \
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md5_hash[0], md5_hash[1], md5_hash[2], md5_hash[3], \
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md5_hash[4], md5_hash[5], md5_hash[6], md5_hash[7], \
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md5_hash[8], md5_hash[9], md5_hash[10], md5_hash[11],\
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md5_hash[12], md5_hash[13], md5_hash[14], md5_hash[15]
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static int
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symlink_hash(unsigned int link_len, const char *link_str, u8 *md5_hash)
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{
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int rc;
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unsigned int size;
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struct crypto_shash *md5;
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struct sdesc *sdescmd5;
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md5 = crypto_alloc_shash("md5", 0, 0);
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if (IS_ERR(md5)) {
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rc = PTR_ERR(md5);
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cERROR(1, "%s: Crypto md5 allocation error %d\n", __func__, rc);
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return rc;
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}
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size = sizeof(struct shash_desc) + crypto_shash_descsize(md5);
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sdescmd5 = kmalloc(size, GFP_KERNEL);
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if (!sdescmd5) {
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rc = -ENOMEM;
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cERROR(1, "%s: Memory allocation failure\n", __func__);
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goto symlink_hash_err;
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}
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sdescmd5->shash.tfm = md5;
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sdescmd5->shash.flags = 0x0;
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rc = crypto_shash_init(&sdescmd5->shash);
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if (rc) {
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cERROR(1, "%s: Could not init md5 shash\n", __func__);
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goto symlink_hash_err;
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}
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rc = crypto_shash_update(&sdescmd5->shash, link_str, link_len);
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if (rc) {
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cERROR(1, "%s: Could not update iwth link_str\n", __func__);
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goto symlink_hash_err;
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}
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rc = crypto_shash_final(&sdescmd5->shash, md5_hash);
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if (rc)
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cERROR(1, "%s: Could not generate md5 hash\n", __func__);
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symlink_hash_err:
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crypto_free_shash(md5);
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kfree(sdescmd5);
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return rc;
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}
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static int
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CIFSParseMFSymlink(const u8 *buf,
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unsigned int buf_len,
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unsigned int *_link_len,
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char **_link_str)
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{
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int rc;
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unsigned int link_len;
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const char *md5_str1;
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const char *link_str;
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u8 md5_hash[16];
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char md5_str2[34];
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if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE)
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return -EINVAL;
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md5_str1 = (const char *)&buf[CIFS_MF_SYMLINK_MD5_OFFSET];
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link_str = (const char *)&buf[CIFS_MF_SYMLINK_LINK_OFFSET];
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rc = sscanf(buf, CIFS_MF_SYMLINK_LEN_FORMAT, &link_len);
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if (rc != 1)
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return -EINVAL;
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rc = symlink_hash(link_len, link_str, md5_hash);
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if (rc) {
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cFYI(1, "%s: MD5 hash failure: %d\n", __func__, rc);
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return rc;
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}
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snprintf(md5_str2, sizeof(md5_str2),
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CIFS_MF_SYMLINK_MD5_FORMAT,
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CIFS_MF_SYMLINK_MD5_ARGS(md5_hash));
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if (strncmp(md5_str1, md5_str2, 17) != 0)
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return -EINVAL;
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if (_link_str) {
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*_link_str = kstrndup(link_str, link_len, GFP_KERNEL);
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if (!*_link_str)
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return -ENOMEM;
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}
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*_link_len = link_len;
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return 0;
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}
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static int
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CIFSFormatMFSymlink(u8 *buf, unsigned int buf_len, const char *link_str)
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{
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int rc;
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unsigned int link_len;
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unsigned int ofs;
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u8 md5_hash[16];
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if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE)
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return -EINVAL;
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link_len = strlen(link_str);
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if (link_len > CIFS_MF_SYMLINK_LINK_MAXLEN)
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return -ENAMETOOLONG;
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rc = symlink_hash(link_len, link_str, md5_hash);
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if (rc) {
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cFYI(1, "%s: MD5 hash failure: %d\n", __func__, rc);
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return rc;
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}
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snprintf(buf, buf_len,
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CIFS_MF_SYMLINK_LEN_FORMAT CIFS_MF_SYMLINK_MD5_FORMAT,
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link_len,
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CIFS_MF_SYMLINK_MD5_ARGS(md5_hash));
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ofs = CIFS_MF_SYMLINK_LINK_OFFSET;
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memcpy(buf + ofs, link_str, link_len);
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ofs += link_len;
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if (ofs < CIFS_MF_SYMLINK_FILE_SIZE) {
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buf[ofs] = '\n';
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ofs++;
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}
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while (ofs < CIFS_MF_SYMLINK_FILE_SIZE) {
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buf[ofs] = ' ';
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ofs++;
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}
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return 0;
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}
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static int
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CIFSCreateMFSymLink(const int xid, struct cifs_tcon *tcon,
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const char *fromName, const char *toName,
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struct cifs_sb_info *cifs_sb)
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{
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int rc;
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int oplock = 0;
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int remap;
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int create_options = CREATE_NOT_DIR;
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__u16 netfid = 0;
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u8 *buf;
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unsigned int bytes_written = 0;
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struct cifs_io_parms io_parms;
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struct nls_table *nls_codepage;
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nls_codepage = cifs_sb->local_nls;
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remap = cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR;
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buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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rc = CIFSFormatMFSymlink(buf, CIFS_MF_SYMLINK_FILE_SIZE, toName);
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if (rc != 0) {
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kfree(buf);
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return rc;
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}
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if (backup_cred(cifs_sb))
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create_options |= CREATE_OPEN_BACKUP_INTENT;
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rc = CIFSSMBOpen(xid, tcon, fromName, FILE_CREATE, GENERIC_WRITE,
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create_options, &netfid, &oplock, NULL,
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nls_codepage, remap);
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if (rc != 0) {
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kfree(buf);
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return rc;
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}
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io_parms.netfid = netfid;
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io_parms.pid = current->tgid;
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io_parms.tcon = tcon;
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io_parms.offset = 0;
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io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
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rc = CIFSSMBWrite(xid, &io_parms, &bytes_written, buf, NULL, 0);
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CIFSSMBClose(xid, tcon, netfid);
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kfree(buf);
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if (rc != 0)
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return rc;
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if (bytes_written != CIFS_MF_SYMLINK_FILE_SIZE)
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return -EIO;
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return 0;
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}
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static int
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CIFSQueryMFSymLink(const int xid, struct cifs_tcon *tcon,
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const unsigned char *searchName, char **symlinkinfo,
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const struct nls_table *nls_codepage, int remap)
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{
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int rc;
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int oplock = 0;
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__u16 netfid = 0;
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u8 *buf;
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char *pbuf;
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unsigned int bytes_read = 0;
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int buf_type = CIFS_NO_BUFFER;
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unsigned int link_len = 0;
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struct cifs_io_parms io_parms;
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FILE_ALL_INFO file_info;
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rc = CIFSSMBOpen(xid, tcon, searchName, FILE_OPEN, GENERIC_READ,
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CREATE_NOT_DIR, &netfid, &oplock, &file_info,
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nls_codepage, remap);
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if (rc != 0)
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return rc;
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if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
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CIFSSMBClose(xid, tcon, netfid);
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/* it's not a symlink */
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return -EINVAL;
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}
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buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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pbuf = buf;
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io_parms.netfid = netfid;
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io_parms.pid = current->tgid;
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io_parms.tcon = tcon;
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io_parms.offset = 0;
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io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
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rc = CIFSSMBRead(xid, &io_parms, &bytes_read, &pbuf, &buf_type);
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CIFSSMBClose(xid, tcon, netfid);
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if (rc != 0) {
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kfree(buf);
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return rc;
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}
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rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, symlinkinfo);
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kfree(buf);
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if (rc != 0)
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return rc;
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return 0;
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}
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bool
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CIFSCouldBeMFSymlink(const struct cifs_fattr *fattr)
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{
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if (!(fattr->cf_mode & S_IFREG))
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/* it's not a symlink */
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return false;
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if (fattr->cf_eof != CIFS_MF_SYMLINK_FILE_SIZE)
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/* it's not a symlink */
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return false;
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return true;
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}
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int
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CIFSCheckMFSymlink(struct cifs_fattr *fattr,
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const unsigned char *path,
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struct cifs_sb_info *cifs_sb, int xid)
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{
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int rc;
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int oplock = 0;
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__u16 netfid = 0;
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struct tcon_link *tlink;
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struct cifs_tcon *pTcon;
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struct cifs_io_parms io_parms;
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u8 *buf;
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char *pbuf;
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unsigned int bytes_read = 0;
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int buf_type = CIFS_NO_BUFFER;
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unsigned int link_len = 0;
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FILE_ALL_INFO file_info;
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if (!CIFSCouldBeMFSymlink(fattr))
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/* it's not a symlink */
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return 0;
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tlink = cifs_sb_tlink(cifs_sb);
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if (IS_ERR(tlink))
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return PTR_ERR(tlink);
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pTcon = tlink_tcon(tlink);
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rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
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CREATE_NOT_DIR, &netfid, &oplock, &file_info,
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cifs_sb->local_nls,
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cifs_sb->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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if (rc != 0)
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goto out;
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if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
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CIFSSMBClose(xid, pTcon, netfid);
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/* it's not a symlink */
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goto out;
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}
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buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
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if (!buf) {
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rc = -ENOMEM;
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goto out;
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}
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pbuf = buf;
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io_parms.netfid = netfid;
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io_parms.pid = current->tgid;
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io_parms.tcon = pTcon;
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io_parms.offset = 0;
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io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
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rc = CIFSSMBRead(xid, &io_parms, &bytes_read, &pbuf, &buf_type);
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CIFSSMBClose(xid, pTcon, netfid);
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if (rc != 0) {
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kfree(buf);
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goto out;
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}
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rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, NULL);
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kfree(buf);
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if (rc == -EINVAL) {
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/* it's not a symlink */
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rc = 0;
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goto out;
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}
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if (rc != 0)
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goto out;
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/* it is a symlink */
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fattr->cf_eof = link_len;
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fattr->cf_mode &= ~S_IFMT;
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fattr->cf_mode |= S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO;
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fattr->cf_dtype = DT_LNK;
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out:
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cifs_put_tlink(tlink);
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return rc;
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}
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int
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cifs_hardlink(struct dentry *old_file, struct inode *inode,
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struct dentry *direntry)
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{
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int rc = -EACCES;
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int xid;
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char *fromName = NULL;
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char *toName = NULL;
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struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
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struct tcon_link *tlink;
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struct cifs_tcon *pTcon;
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struct cifsInodeInfo *cifsInode;
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tlink = cifs_sb_tlink(cifs_sb);
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if (IS_ERR(tlink))
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return PTR_ERR(tlink);
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pTcon = tlink_tcon(tlink);
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xid = GetXid();
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fromName = build_path_from_dentry(old_file);
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toName = build_path_from_dentry(direntry);
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if ((fromName == NULL) || (toName == NULL)) {
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rc = -ENOMEM;
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goto cifs_hl_exit;
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}
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if (pTcon->unix_ext)
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rc = CIFSUnixCreateHardLink(xid, pTcon, fromName, toName,
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cifs_sb->local_nls,
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cifs_sb->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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else {
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rc = CIFSCreateHardLink(xid, pTcon, fromName, toName,
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cifs_sb->local_nls,
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cifs_sb->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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if ((rc == -EIO) || (rc == -EINVAL))
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rc = -EOPNOTSUPP;
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}
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d_drop(direntry); /* force new lookup from server of target */
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/* if source file is cached (oplocked) revalidate will not go to server
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until the file is closed or oplock broken so update nlinks locally */
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if (old_file->d_inode) {
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cifsInode = CIFS_I(old_file->d_inode);
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if (rc == 0) {
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inc_nlink(old_file->d_inode);
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/* BB should we make this contingent on superblock flag NOATIME? */
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/* old_file->d_inode->i_ctime = CURRENT_TIME;*/
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/* parent dir timestamps will update from srv
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within a second, would it really be worth it
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to set the parent dir cifs inode time to zero
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to force revalidate (faster) for it too? */
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}
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/* if not oplocked will force revalidate to get info
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on source file from srv */
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cifsInode->time = 0;
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/* Will update parent dir timestamps from srv within a second.
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Would it really be worth it to set the parent dir (cifs
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inode) time field to zero to force revalidate on parent
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directory faster ie
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CIFS_I(inode)->time = 0; */
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}
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cifs_hl_exit:
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kfree(fromName);
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kfree(toName);
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FreeXid(xid);
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cifs_put_tlink(tlink);
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return rc;
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}
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void *
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cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
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{
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struct inode *inode = direntry->d_inode;
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int rc = -ENOMEM;
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int xid;
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char *full_path = NULL;
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char *target_path = NULL;
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struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
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struct tcon_link *tlink = NULL;
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struct cifs_tcon *tcon;
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|
|
xid = GetXid();
|
|
|
|
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)
|
|
&& !(tcon->ses->capabilities & CAP_UNIX)) {
|
|
rc = -EACCES;
|
|
goto out;
|
|
}
|
|
|
|
full_path = build_path_from_dentry(direntry);
|
|
if (!full_path)
|
|
goto out;
|
|
|
|
cFYI(1, "Full path: %s inode = 0x%p", 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) && (tcon->ses->capabilities & CAP_UNIX))
|
|
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);
|
|
}
|
|
|
|
FreeXid(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;
|
|
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 = GetXid();
|
|
|
|
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;
|
|
}
|
|
|
|
cFYI(1, "Full path: %s", full_path);
|
|
cFYI(1, "symname is %s", 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) {
|
|
cFYI(1, "Create symlink ok, getinodeinfo fail rc = %d",
|
|
rc);
|
|
} else {
|
|
d_instantiate(direntry, newinode);
|
|
}
|
|
}
|
|
symlink_exit:
|
|
kfree(full_path);
|
|
cifs_put_tlink(tlink);
|
|
FreeXid(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);
|
|
}
|