[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/fs/cifs/link.c b/ap/os/linux/linux-3.4.x/fs/cifs/link.c
new file mode 100644
index 0000000..6b0e064
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/cifs/link.c
@@ -0,0 +1,606 @@
+/*
+ * 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);
+ cERROR(1, "%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;
+ cERROR(1, "%s: Memory allocation failure\n", __func__);
+ goto symlink_hash_err;
+ }
+ sdescmd5->shash.tfm = md5;
+ sdescmd5->shash.flags = 0x0;
+
+ rc = crypto_shash_init(&sdescmd5->shash);
+ if (rc) {
+ cERROR(1, "%s: Could not init md5 shash\n", __func__);
+ goto symlink_hash_err;
+ }
+ rc = crypto_shash_update(&sdescmd5->shash, link_str, link_len);
+ if (rc) {
+ cERROR(1, "%s: Could not update iwth link_str\n", __func__);
+ goto symlink_hash_err;
+ }
+ rc = crypto_shash_final(&sdescmd5->shash, md5_hash);
+ if (rc)
+ cERROR(1, "%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) {
+ cFYI(1, "%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) {
+ cFYI(1, "%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 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 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, 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;
+ int xid;
+ char *fromName = NULL;
+ char *toName = NULL;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+ struct tcon_link *tlink;
+ struct cifs_tcon *pTcon;
+ struct cifsInodeInfo *cifsInode;
+
+ tlink = cifs_sb_tlink(cifs_sb);
+ if (IS_ERR(tlink))
+ return PTR_ERR(tlink);
+ pTcon = tlink_tcon(tlink);
+
+ xid = GetXid();
+
+ fromName = build_path_from_dentry(old_file);
+ toName = build_path_from_dentry(direntry);
+ if ((fromName == NULL) || (toName == NULL)) {
+ rc = -ENOMEM;
+ goto cifs_hl_exit;
+ }
+
+ if (pTcon->unix_ext)
+ rc = CIFSUnixCreateHardLink(xid, pTcon, fromName, toName,
+ cifs_sb->local_nls,
+ cifs_sb->mnt_cifs_flags &
+ CIFS_MOUNT_MAP_SPECIAL_CHR);
+ else {
+ rc = CIFSCreateHardLink(xid, pTcon, fromName, toName,
+ cifs_sb->local_nls,
+ cifs_sb->mnt_cifs_flags &
+ CIFS_MOUNT_MAP_SPECIAL_CHR);
+ 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) {
+ inc_nlink(old_file->d_inode);
+/* 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(fromName);
+ kfree(toName);
+ FreeXid(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;
+ 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 = 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);
+}