--- /dev/null
+/*
+ * fs/cifs/dir.c
+ *
+ * vfs operations that deal with dentries
+ *
+ * Copyright (C) International Business Machines Corp., 2002,2009
+ * 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 <linux/mount.h>
+#include <linux/file.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"
+
+static void
+renew_parental_timestamps(struct dentry *direntry)
+{
+ /* BB check if there is a way to get the kernel to do this or if we
+ really need this */
+ do {
+ direntry->d_time = jiffies;
+ direntry = direntry->d_parent;
+ } while (!IS_ROOT(direntry));
+}
+
+char *
+cifs_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
+ struct cifs_tcon *tcon)
+{
+ int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
+ int dfsplen;
+ char *full_path = NULL;
+
+ /* if no prefix path, simply set path to the root of share to "" */
+ if (pplen == 0) {
+ full_path = kzalloc(1, GFP_KERNEL);
+ return full_path;
+ }
+
+ if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
+ dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
+ else
+ dfsplen = 0;
+
+ full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
+ if (full_path == NULL)
+ return full_path;
+
+ if (dfsplen)
+ strncpy(full_path, tcon->treeName, dfsplen);
+ full_path[dfsplen] = CIFS_DIR_SEP(cifs_sb);
+ strncpy(full_path + dfsplen + 1, vol->prepath, pplen);
+ convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
+ full_path[dfsplen + pplen] = 0; /* add trailing null */
+ return full_path;
+}
+
+/* Note: caller must free return buffer */
+char *
+build_path_from_dentry(struct dentry *direntry)
+{
+ struct dentry *temp;
+ int namelen;
+ int dfsplen;
+ char *full_path;
+ char dirsep;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
+ struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
+ unsigned seq;
+
+ dirsep = CIFS_DIR_SEP(cifs_sb);
+ if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
+ dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
+ else
+ dfsplen = 0;
+cifs_bp_rename_retry:
+ namelen = dfsplen;
+ seq = read_seqbegin(&rename_lock);
+ rcu_read_lock();
+ for (temp = direntry; !IS_ROOT(temp);) {
+ namelen += (1 + temp->d_name.len);
+ temp = temp->d_parent;
+ if (temp == NULL) {
+ cifs_dbg(VFS, "corrupt dentry\n");
+ rcu_read_unlock();
+ return NULL;
+ }
+ }
+ rcu_read_unlock();
+
+ full_path = kmalloc(namelen+1, GFP_KERNEL);
+ if (full_path == NULL)
+ return full_path;
+ full_path[namelen] = 0; /* trailing null */
+ rcu_read_lock();
+ for (temp = direntry; !IS_ROOT(temp);) {
+ spin_lock(&temp->d_lock);
+ namelen -= 1 + temp->d_name.len;
+ if (namelen < 0) {
+ spin_unlock(&temp->d_lock);
+ break;
+ } else {
+ full_path[namelen] = dirsep;
+ strncpy(full_path + namelen + 1, temp->d_name.name,
+ temp->d_name.len);
+ cifs_dbg(FYI, "name: %s\n", full_path + namelen);
+ }
+ spin_unlock(&temp->d_lock);
+ temp = temp->d_parent;
+ if (temp == NULL) {
+ cifs_dbg(VFS, "corrupt dentry\n");
+ rcu_read_unlock();
+ kfree(full_path);
+ return NULL;
+ }
+ }
+ rcu_read_unlock();
+ if (namelen != dfsplen || read_seqretry(&rename_lock, seq)) {
+ cifs_dbg(FYI, "did not end path lookup where expected. namelen=%ddfsplen=%d\n",
+ namelen, dfsplen);
+ /* presumably this is only possible if racing with a rename
+ of one of the parent directories (we can not lock the dentries
+ above us to prevent this, but retrying should be harmless) */
+ kfree(full_path);
+ goto cifs_bp_rename_retry;
+ }
+ /* DIR_SEP already set for byte 0 / vs \ but not for
+ subsequent slashes in prepath which currently must
+ be entered the right way - not sure if there is an alternative
+ since the '\' is a valid posix character so we can not switch
+ those safely to '/' if any are found in the middle of the prepath */
+ /* BB test paths to Windows with '/' in the midst of prepath */
+
+ if (dfsplen) {
+ strncpy(full_path, tcon->treeName, dfsplen);
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
+ int i;
+ for (i = 0; i < dfsplen; i++) {
+ if (full_path[i] == '\\')
+ full_path[i] = '/';
+ }
+ }
+ }
+ return full_path;
+}
+
+/*
+ * Don't allow the separator character in a path component.
+ * The VFS will not allow "/", but "\" is allowed by posix.
+ */
+static int
+check_name(struct dentry *direntry)
+{
+ struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
+ int i;
+
+ if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
+ for (i = 0; i < direntry->d_name.len; i++) {
+ if (direntry->d_name.name[i] == '\\') {
+ cifs_dbg(FYI, "Invalid file name\n");
+ return -EINVAL;
+ }
+ }
+ }
+ return 0;
+}
+
+
+/* Inode operations in similar order to how they appear in Linux file fs.h */
+
+static int
+cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
+ struct tcon_link *tlink, unsigned oflags, umode_t mode,
+ __u32 *oplock, struct cifs_fid *fid)
+{
+ int rc = -ENOENT;
+ int create_options = CREATE_NOT_DIR;
+ int desired_access;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+ struct cifs_tcon *tcon = tlink_tcon(tlink);
+ char *full_path = NULL;
+ FILE_ALL_INFO *buf = NULL;
+ struct inode *newinode = NULL;
+ int disposition;
+ struct TCP_Server_Info *server = tcon->ses->server;
+ struct cifs_open_parms oparms;
+
+ *oplock = 0;
+ if (tcon->ses->server->oplocks)
+ *oplock = REQ_OPLOCK;
+
+ full_path = build_path_from_dentry(direntry);
+ if (full_path == NULL) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
+ (CIFS_UNIX_POSIX_PATH_OPS_CAP &
+ le64_to_cpu(tcon->fsUnixInfo.Capability))) {
+ rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
+ oflags, oplock, &fid->netfid, xid);
+ switch (rc) {
+ case 0:
+ if (newinode == NULL) {
+ /* query inode info */
+ goto cifs_create_get_file_info;
+ }
+
+ if (!S_ISREG(newinode->i_mode)) {
+ /*
+ * The server may allow us to open things like
+ * FIFOs, but the client isn't set up to deal
+ * with that. If it's not a regular file, just
+ * close it and proceed as if it were a normal
+ * lookup.
+ */
+ CIFSSMBClose(xid, tcon, fid->netfid);
+ goto cifs_create_get_file_info;
+ }
+ /* success, no need to query */
+ goto cifs_create_set_dentry;
+
+ case -ENOENT:
+ goto cifs_create_get_file_info;
+
+ case -EIO:
+ case -EINVAL:
+ /*
+ * EIO could indicate that (posix open) operation is not
+ * supported, despite what server claimed in capability
+ * negotiation.
+ *
+ * POSIX open in samba versions 3.3.1 and earlier could
+ * incorrectly fail with invalid parameter.
+ */
+ tcon->broken_posix_open = true;
+ break;
+
+ case -EREMOTE:
+ case -EOPNOTSUPP:
+ /*
+ * EREMOTE indicates DFS junction, which is not handled
+ * in posix open. If either that or op not supported
+ * returned, follow the normal lookup.
+ */
+ break;
+
+ default:
+ goto out;
+ }
+ /*
+ * fallthrough to retry, using older open call, this is case
+ * where server does not support this SMB level, and falsely
+ * claims capability (also get here for DFS case which should be
+ * rare for path not covered on files)
+ */
+ }
+
+ desired_access = 0;
+ if (OPEN_FMODE(oflags) & FMODE_READ)
+ desired_access |= GENERIC_READ; /* is this too little? */
+ if (OPEN_FMODE(oflags) & FMODE_WRITE)
+ desired_access |= GENERIC_WRITE;
+
+ disposition = FILE_OVERWRITE_IF;
+ if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
+ disposition = FILE_CREATE;
+ else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
+ disposition = FILE_OVERWRITE_IF;
+ else if ((oflags & O_CREAT) == O_CREAT)
+ disposition = FILE_OPEN_IF;
+ else
+ cifs_dbg(FYI, "Create flag not set in create function\n");
+
+ /*
+ * BB add processing to set equivalent of mode - e.g. via CreateX with
+ * ACLs
+ */
+
+ if (!server->ops->open) {
+ rc = -ENOSYS;
+ goto out;
+ }
+
+ buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
+ if (buf == NULL) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ /*
+ * if we're not using unix extensions, see if we need to set
+ * ATTR_READONLY on the create call
+ */
+ if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
+ create_options |= CREATE_OPTION_READONLY;
+
+ if (backup_cred(cifs_sb))
+ create_options |= CREATE_OPEN_BACKUP_INTENT;
+
+ oparms.tcon = tcon;
+ oparms.cifs_sb = cifs_sb;
+ oparms.desired_access = desired_access;
+ oparms.create_options = create_options;
+ oparms.disposition = disposition;
+ oparms.path = full_path;
+ oparms.fid = fid;
+ oparms.reconnect = false;
+
+ rc = server->ops->open(xid, &oparms, oplock, buf);
+ if (rc) {
+ cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
+ goto out;
+ }
+
+ /*
+ * If Open reported that we actually created a file then we now have to
+ * set the mode if possible.
+ */
+ if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
+ struct cifs_unix_set_info_args args = {
+ .mode = mode,
+ .ctime = NO_CHANGE_64,
+ .atime = NO_CHANGE_64,
+ .mtime = NO_CHANGE_64,
+ .device = 0,
+ };
+
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
+ args.uid = current_fsuid();
+ if (inode->i_mode & S_ISGID)
+ args.gid = inode->i_gid;
+ else
+ args.gid = current_fsgid();
+ } else {
+ args.uid = INVALID_UID; /* no change */
+ args.gid = INVALID_GID; /* no change */
+ }
+ CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
+ current->tgid);
+ } else {
+ /*
+ * BB implement mode setting via Windows security
+ * descriptors e.g.
+ */
+ /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
+
+ /* Could set r/o dos attribute if mode & 0222 == 0 */
+ }
+
+cifs_create_get_file_info:
+ /* server might mask mode so we have to query for it */
+ if (tcon->unix_ext)
+ rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
+ xid);
+ else {
+ rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
+ xid, fid);
+ if (newinode) {
+ if (server->ops->set_lease_key)
+ server->ops->set_lease_key(newinode, fid);
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
+ newinode->i_mode = mode;
+ if ((*oplock & CIFS_CREATE_ACTION) &&
+ (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
+ newinode->i_uid = current_fsuid();
+ if (inode->i_mode & S_ISGID)
+ newinode->i_gid = inode->i_gid;
+ else
+ newinode->i_gid = current_fsgid();
+ }
+ }
+ }
+
+cifs_create_set_dentry:
+ if (rc != 0) {
+ cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
+ rc);
+ if (server->ops->close)
+ server->ops->close(xid, tcon, fid);
+ goto out;
+ }
+ d_drop(direntry);
+ d_add(direntry, newinode);
+
+out:
+ kfree(buf);
+ kfree(full_path);
+ return rc;
+}
+
+int
+cifs_atomic_open(struct inode *inode, struct dentry *direntry,
+ struct file *file, unsigned oflags, umode_t mode,
+ int *opened)
+{
+ int rc;
+ unsigned int xid;
+ struct tcon_link *tlink;
+ struct cifs_tcon *tcon;
+ struct TCP_Server_Info *server;
+ struct cifs_fid fid;
+ struct cifs_pending_open open;
+ __u32 oplock;
+ struct cifsFileInfo *file_info;
+
+ /*
+ * Posix open is only called (at lookup time) for file create now. For
+ * opens (rather than creates), because we do not know if it is a file
+ * or directory yet, and current Samba no longer allows us to do posix
+ * open on dirs, we could end up wasting an open call on what turns out
+ * to be a dir. For file opens, we wait to call posix open till
+ * cifs_open. It could be added to atomic_open in the future but the
+ * performance tradeoff of the extra network request when EISDIR or
+ * EACCES is returned would have to be weighed against the 50% reduction
+ * in network traffic in the other paths.
+ */
+ if (!(oflags & O_CREAT)) {
+ struct dentry *res;
+
+ /*
+ * Check for hashed negative dentry. We have already revalidated
+ * the dentry and it is fine. No need to perform another lookup.
+ */
+ if (!d_unhashed(direntry))
+ return -ENOENT;
+
+ res = cifs_lookup(inode, direntry, 0);
+ if (IS_ERR(res))
+ return PTR_ERR(res);
+
+ return finish_no_open(file, res);
+ }
+
+ rc = check_name(direntry);
+ if (rc)
+ return rc;
+
+ xid = get_xid();
+
+ cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
+ inode, direntry, direntry);
+
+ tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
+ if (IS_ERR(tlink)) {
+ rc = PTR_ERR(tlink);
+ goto out_free_xid;
+ }
+
+ tcon = tlink_tcon(tlink);
+ server = tcon->ses->server;
+
+ if (server->ops->new_lease_key)
+ server->ops->new_lease_key(&fid);
+
+ cifs_add_pending_open(&fid, tlink, &open);
+
+ rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
+ &oplock, &fid);
+
+ if (rc) {
+ cifs_del_pending_open(&open);
+ goto out;
+ }
+
+ if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
+ *opened |= FILE_CREATED;
+
+ rc = finish_open(file, direntry, generic_file_open, opened);
+ if (rc) {
+ if (server->ops->close)
+ server->ops->close(xid, tcon, &fid);
+ cifs_del_pending_open(&open);
+ goto out;
+ }
+
+ if (file->f_flags & O_DIRECT &&
+ CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
+ if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
+ file->f_op = &cifs_file_direct_nobrl_ops;
+ else
+ file->f_op = &cifs_file_direct_ops;
+ }
+
+ file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
+ if (file_info == NULL) {
+ if (server->ops->close)
+ server->ops->close(xid, tcon, &fid);
+ cifs_del_pending_open(&open);
+ fput(file);
+ rc = -ENOMEM;
+ }
+
+out:
+ cifs_put_tlink(tlink);
+out_free_xid:
+ free_xid(xid);
+ return rc;
+}
+
+int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
+ bool excl)
+{
+ int rc;
+ unsigned int xid = get_xid();
+ /*
+ * BB below access is probably too much for mknod to request
+ * but we have to do query and setpathinfo so requesting
+ * less could fail (unless we want to request getatr and setatr
+ * permissions (only). At least for POSIX we do not have to
+ * request so much.
+ */
+ unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
+ struct tcon_link *tlink;
+ struct cifs_tcon *tcon;
+ struct TCP_Server_Info *server;
+ struct cifs_fid fid;
+ __u32 oplock;
+
+ cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
+ inode, direntry, direntry);
+
+ tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
+ rc = PTR_ERR(tlink);
+ if (IS_ERR(tlink))
+ goto out_free_xid;
+
+ tcon = tlink_tcon(tlink);
+ server = tcon->ses->server;
+
+ if (server->ops->new_lease_key)
+ server->ops->new_lease_key(&fid);
+
+ rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
+ &oplock, &fid);
+ if (!rc && server->ops->close)
+ server->ops->close(xid, tcon, &fid);
+
+ cifs_put_tlink(tlink);
+out_free_xid:
+ free_xid(xid);
+ return rc;
+}
+
+int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
+ dev_t device_number)
+{
+ int rc = -EPERM;
+ unsigned int xid;
+ int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
+ struct cifs_sb_info *cifs_sb;
+ struct tcon_link *tlink;
+ struct cifs_tcon *tcon;
+ struct cifs_io_parms io_parms;
+ char *full_path = NULL;
+ struct inode *newinode = NULL;
+ __u32 oplock = 0;
+ struct cifs_fid fid;
+ struct cifs_open_parms oparms;
+ FILE_ALL_INFO *buf = NULL;
+ unsigned int bytes_written;
+ struct win_dev *pdev;
+ struct kvec iov[2];
+
+ if (!old_valid_dev(device_number))
+ return -EINVAL;
+
+ cifs_sb = CIFS_SB(inode->i_sb);
+ tlink = cifs_sb_tlink(cifs_sb);
+ if (IS_ERR(tlink))
+ return PTR_ERR(tlink);
+
+ tcon = tlink_tcon(tlink);
+
+ xid = get_xid();
+
+ full_path = build_path_from_dentry(direntry);
+ if (full_path == NULL) {
+ rc = -ENOMEM;
+ goto mknod_out;
+ }
+
+ if (tcon->unix_ext) {
+ struct cifs_unix_set_info_args args = {
+ .mode = mode & ~current_umask(),
+ .ctime = NO_CHANGE_64,
+ .atime = NO_CHANGE_64,
+ .mtime = NO_CHANGE_64,
+ .device = device_number,
+ };
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
+ args.uid = current_fsuid();
+ args.gid = current_fsgid();
+ } else {
+ args.uid = INVALID_UID; /* no change */
+ args.gid = INVALID_GID; /* no change */
+ }
+ rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
+ cifs_sb->local_nls,
+ cifs_remap(cifs_sb));
+ if (rc)
+ goto mknod_out;
+
+ rc = cifs_get_inode_info_unix(&newinode, full_path,
+ inode->i_sb, xid);
+
+ if (rc == 0)
+ d_instantiate(direntry, newinode);
+ goto mknod_out;
+ }
+
+ if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
+ goto mknod_out;
+
+
+ cifs_dbg(FYI, "sfu compat create special file\n");
+
+ buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
+ if (buf == NULL) {
+ kfree(full_path);
+ rc = -ENOMEM;
+ free_xid(xid);
+ return rc;
+ }
+
+ 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 = full_path;
+ oparms.fid = &fid;
+ oparms.reconnect = false;
+
+ if (tcon->ses->server->oplocks)
+ oplock = REQ_OPLOCK;
+ else
+ oplock = 0;
+ rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
+ if (rc)
+ goto mknod_out;
+
+ /*
+ * BB Do not bother to decode buf since no local inode yet to put
+ * timestamps in, but we can reuse it safely.
+ */
+
+ pdev = (struct win_dev *)buf;
+ io_parms.pid = current->tgid;
+ io_parms.tcon = tcon;
+ io_parms.offset = 0;
+ io_parms.length = sizeof(struct win_dev);
+ iov[1].iov_base = buf;
+ iov[1].iov_len = sizeof(struct win_dev);
+ if (S_ISCHR(mode)) {
+ memcpy(pdev->type, "IntxCHR", 8);
+ pdev->major = cpu_to_le64(MAJOR(device_number));
+ pdev->minor = cpu_to_le64(MINOR(device_number));
+ rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
+ &bytes_written, iov, 1);
+ } else if (S_ISBLK(mode)) {
+ memcpy(pdev->type, "IntxBLK", 8);
+ pdev->major = cpu_to_le64(MAJOR(device_number));
+ pdev->minor = cpu_to_le64(MINOR(device_number));
+ rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
+ &bytes_written, iov, 1);
+ } /* else if (S_ISFIFO) */
+ tcon->ses->server->ops->close(xid, tcon, &fid);
+ d_drop(direntry);
+
+ /* FIXME: add code here to set EAs */
+
+mknod_out:
+ kfree(full_path);
+ kfree(buf);
+ free_xid(xid);
+ cifs_put_tlink(tlink);
+ return rc;
+}
+
+struct dentry *
+cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
+ unsigned int flags)
+{
+ unsigned int xid;
+ int rc = 0; /* to get around spurious gcc warning, set to zero here */
+ struct cifs_sb_info *cifs_sb;
+ struct tcon_link *tlink;
+ struct cifs_tcon *pTcon;
+ struct inode *newInode = NULL;
+ char *full_path = NULL;
+
+ xid = get_xid();
+
+ cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
+ parent_dir_inode, direntry, direntry);
+
+ /* check whether path exists */
+
+ cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
+ tlink = cifs_sb_tlink(cifs_sb);
+ if (IS_ERR(tlink)) {
+ free_xid(xid);
+ return (struct dentry *)tlink;
+ }
+ pTcon = tlink_tcon(tlink);
+
+ rc = check_name(direntry);
+ if (rc)
+ goto lookup_out;
+
+ /* can not grab the rename sem here since it would
+ deadlock in the cases (beginning of sys_rename itself)
+ in which we already have the sb rename sem */
+ full_path = build_path_from_dentry(direntry);
+ if (full_path == NULL) {
+ rc = -ENOMEM;
+ goto lookup_out;
+ }
+
+ if (d_really_is_positive(direntry)) {
+ cifs_dbg(FYI, "non-NULL inode in lookup\n");
+ } else {
+ cifs_dbg(FYI, "NULL inode in lookup\n");
+ }
+ cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
+ full_path, d_inode(direntry));
+
+ if (pTcon->unix_ext) {
+ rc = cifs_get_inode_info_unix(&newInode, full_path,
+ parent_dir_inode->i_sb, xid);
+ } else {
+ rc = cifs_get_inode_info(&newInode, full_path, NULL,
+ parent_dir_inode->i_sb, xid, NULL);
+ }
+
+ if ((rc == 0) && (newInode != NULL)) {
+ d_add(direntry, newInode);
+ /* since paths are not looked up by component - the parent
+ directories are presumed to be good here */
+ renew_parental_timestamps(direntry);
+
+ } else if (rc == -ENOENT) {
+ rc = 0;
+ direntry->d_time = jiffies;
+ d_add(direntry, NULL);
+ /* if it was once a directory (but how can we tell?) we could do
+ shrink_dcache_parent(direntry); */
+ } else if (rc != -EACCES) {
+ cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
+ /* We special case check for Access Denied - since that
+ is a common return code */
+ }
+
+lookup_out:
+ kfree(full_path);
+ cifs_put_tlink(tlink);
+ free_xid(xid);
+ return ERR_PTR(rc);
+}
+
+static int
+cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
+{
+ if (flags & LOOKUP_RCU)
+ return -ECHILD;
+
+ if (d_really_is_positive(direntry)) {
+ if (cifs_revalidate_dentry(direntry))
+ return 0;
+ else {
+ /*
+ * If the inode wasn't known to be a dfs entry when
+ * the dentry was instantiated, such as when created
+ * via ->readdir(), it needs to be set now since the
+ * attributes will have been updated by
+ * cifs_revalidate_dentry().
+ */
+ if (IS_AUTOMOUNT(d_inode(direntry)) &&
+ !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
+ spin_lock(&direntry->d_lock);
+ direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
+ spin_unlock(&direntry->d_lock);
+ }
+
+ return 1;
+ }
+ }
+
+ /*
+ * This may be nfsd (or something), anyway, we can't see the
+ * intent of this. So, since this can be for creation, drop it.
+ */
+ if (!flags)
+ return 0;
+
+ /*
+ * Drop the negative dentry, in order to make sure to use the
+ * case sensitive name which is specified by user if this is
+ * for creation.
+ */
+ if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
+ return 0;
+
+ if (time_after(jiffies, direntry->d_time + HZ) || !lookupCacheEnabled)
+ return 0;
+
+ return 1;
+}
+
+/* static int cifs_d_delete(struct dentry *direntry)
+{
+ int rc = 0;
+
+ cifs_dbg(FYI, "In cifs d_delete, name = %pd\n", direntry);
+
+ return rc;
+} */
+
+const struct dentry_operations cifs_dentry_ops = {
+ .d_revalidate = cifs_d_revalidate,
+ .d_automount = cifs_dfs_d_automount,
+/* d_delete: cifs_d_delete, */ /* not needed except for debugging */
+};
+
+static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
+{
+ struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
+ unsigned long hash;
+ wchar_t c;
+ int i, charlen;
+
+ hash = init_name_hash();
+ for (i = 0; i < q->len; i += charlen) {
+ charlen = codepage->char2uni(&q->name[i], q->len - i, &c);
+ /* error out if we can't convert the character */
+ if (unlikely(charlen < 0))
+ return charlen;
+ hash = partial_name_hash(cifs_toupper(c), hash);
+ }
+ q->hash = end_name_hash(hash);
+
+ return 0;
+}
+
+static int cifs_ci_compare(const struct dentry *parent, const struct dentry *dentry,
+ unsigned int len, const char *str, const struct qstr *name)
+{
+ struct nls_table *codepage = CIFS_SB(parent->d_sb)->local_nls;
+ wchar_t c1, c2;
+ int i, l1, l2;
+
+ /*
+ * We make the assumption here that uppercase characters in the local
+ * codepage are always the same length as their lowercase counterparts.
+ *
+ * If that's ever not the case, then this will fail to match it.
+ */
+ if (name->len != len)
+ return 1;
+
+ for (i = 0; i < len; i += l1) {
+ /* Convert characters in both strings to UTF-16. */
+ l1 = codepage->char2uni(&str[i], len - i, &c1);
+ l2 = codepage->char2uni(&name->name[i], name->len - i, &c2);
+
+ /*
+ * If we can't convert either character, just declare it to
+ * be 1 byte long and compare the original byte.
+ */
+ if (unlikely(l1 < 0 && l2 < 0)) {
+ if (str[i] != name->name[i])
+ return 1;
+ l1 = 1;
+ continue;
+ }
+
+ /*
+ * Here, we again ass|u|me that upper/lowercase versions of
+ * a character are the same length in the local NLS.
+ */
+ if (l1 != l2)
+ return 1;
+
+ /* Now compare uppercase versions of these characters */
+ if (cifs_toupper(c1) != cifs_toupper(c2))
+ return 1;
+ }
+
+ return 0;
+}
+
+const struct dentry_operations cifs_ci_dentry_ops = {
+ .d_revalidate = cifs_d_revalidate,
+ .d_hash = cifs_ci_hash,
+ .d_compare = cifs_ci_compare,
+ .d_automount = cifs_dfs_d_automount,
+};
Code Review / kvmfornfv.git / blobdiff