[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/dir.c b/ap/os/linux/linux-3.4.x/fs/cifs/dir.c
new file mode 100644
index 0000000..ec4e9a2
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/cifs/dir.c
@@ -0,0 +1,758 @@
+/*
+ * 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"
+
+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));
+}
+
+/* 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) {
+ cERROR(1, "corrupt dentry");
+ 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);
+ cFYI(0, "name: %s", full_path + namelen);
+ }
+ spin_unlock(&temp->d_lock);
+ temp = temp->d_parent;
+ if (temp == NULL) {
+ cERROR(1, "corrupt dentry");
+ rcu_read_unlock();
+ kfree(full_path);
+ return NULL;
+ }
+ }
+ rcu_read_unlock();
+ if (namelen != dfsplen || read_seqretry(&rename_lock, seq)) {
+ cFYI(1, "did not end path lookup where expected. namelen=%d "
+ "dfsplen=%d", 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;
+}
+
+/* Inode operations in similar order to how they appear in Linux file fs.h */
+
+int
+cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
+ struct nameidata *nd)
+{
+ int rc = -ENOENT;
+ int xid;
+ int create_options = CREATE_NOT_DIR;
+ __u32 oplock = 0;
+ int oflags;
+ /*
+ * 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.
+ */
+ int desiredAccess = GENERIC_READ | GENERIC_WRITE;
+ __u16 fileHandle;
+ struct cifs_sb_info *cifs_sb;
+ struct tcon_link *tlink;
+ struct cifs_tcon *tcon;
+ char *full_path = NULL;
+ FILE_ALL_INFO *buf = NULL;
+ struct inode *newinode = NULL;
+ int disposition = FILE_OVERWRITE_IF;
+
+ xid = GetXid();
+
+ cifs_sb = CIFS_SB(inode->i_sb);
+ tlink = cifs_sb_tlink(cifs_sb);
+ if (IS_ERR(tlink)) {
+ FreeXid(xid);
+ return PTR_ERR(tlink);
+ }
+ tcon = tlink_tcon(tlink);
+
+ if (tcon->ses->server->oplocks)
+ oplock = REQ_OPLOCK;
+
+ if (nd)
+ oflags = nd->intent.open.file->f_flags;
+ else
+ oflags = O_RDONLY | O_CREAT;
+
+ full_path = build_path_from_dentry(direntry);
+ if (full_path == NULL) {
+ rc = -ENOMEM;
+ goto cifs_create_out;
+ }
+
+ if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) &&
+ (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, &fileHandle, xid);
+ /* EIO could indicate that (posix open) operation is not
+ supported, despite what server claimed in capability
+ negotiation. EREMOTE indicates DFS junction, which is not
+ handled in posix open */
+
+ if (rc == 0) {
+ if (newinode == NULL) /* query inode info */
+ goto cifs_create_get_file_info;
+ else /* success, no need to query */
+ goto cifs_create_set_dentry;
+ } else if ((rc != -EIO) && (rc != -EREMOTE) &&
+ (rc != -EOPNOTSUPP) && (rc != -EINVAL))
+ goto cifs_create_out;
+ /* else 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) */
+ }
+
+ if (nd) {
+ /* if the file is going to stay open, then we
+ need to set the desired access properly */
+ desiredAccess = 0;
+ if (OPEN_FMODE(oflags) & FMODE_READ)
+ desiredAccess |= GENERIC_READ; /* is this too little? */
+ if (OPEN_FMODE(oflags) & FMODE_WRITE)
+ desiredAccess |= GENERIC_WRITE;
+
+ 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
+ cFYI(1, "Create flag not set in create function");
+ }
+
+ /* BB add processing to set equivalent of mode - e.g. via CreateX with
+ ACLs */
+
+ buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
+ if (buf == NULL) {
+ rc = -ENOMEM;
+ goto cifs_create_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;
+
+ if (tcon->ses->capabilities & CAP_NT_SMBS)
+ rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
+ desiredAccess, create_options,
+ &fileHandle, &oplock, buf, cifs_sb->local_nls,
+ cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
+ else
+ rc = -EIO; /* no NT SMB support fall into legacy open below */
+
+ if (rc == -EIO) {
+ /* old server, retry the open legacy style */
+ rc = SMBLegacyOpen(xid, tcon, full_path, disposition,
+ desiredAccess, create_options,
+ &fileHandle, &oplock, buf, cifs_sb->local_nls,
+ cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
+ }
+ if (rc) {
+ cFYI(1, "cifs_create returned 0x%x", rc);
+ goto cifs_create_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 = (__u64) current_fsuid();
+ if (inode->i_mode & S_ISGID)
+ args.gid = (__u64) inode->i_gid;
+ else
+ args.gid = (__u64) current_fsgid();
+ } else {
+ args.uid = NO_CHANGE_64;
+ args.gid = NO_CHANGE_64;
+ }
+ CIFSSMBUnixSetFileInfo(xid, tcon, &args, fileHandle,
+ 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, &fileHandle);
+ if (newinode) {
+ 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)
+ d_instantiate(direntry, newinode);
+ else
+ cFYI(1, "Create worked, get_inode_info failed rc = %d", rc);
+
+ if (newinode && nd) {
+ struct cifsFileInfo *pfile_info;
+ struct file *filp;
+
+ filp = lookup_instantiate_filp(nd, direntry, generic_file_open);
+ if (IS_ERR(filp)) {
+ rc = PTR_ERR(filp);
+ CIFSSMBClose(xid, tcon, fileHandle);
+ goto cifs_create_out;
+ }
+
+ pfile_info = cifs_new_fileinfo(fileHandle, filp, tlink, oplock);
+ if (pfile_info == NULL) {
+ fput(filp);
+ CIFSSMBClose(xid, tcon, fileHandle);
+ rc = -ENOMEM;
+ }
+ } else {
+ CIFSSMBClose(xid, tcon, fileHandle);
+ }
+
+cifs_create_out:
+ kfree(buf);
+ kfree(full_path);
+ cifs_put_tlink(tlink);
+ FreeXid(xid);
+ return rc;
+}
+
+int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
+ dev_t device_number)
+{
+ int rc = -EPERM;
+ int xid;
+ int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
+ struct cifs_sb_info *cifs_sb;
+ struct tcon_link *tlink;
+ struct cifs_tcon *pTcon;
+ struct cifs_io_parms io_parms;
+ char *full_path = NULL;
+ struct inode *newinode = NULL;
+ int oplock = 0;
+ u16 fileHandle;
+ FILE_ALL_INFO *buf = NULL;
+ unsigned int bytes_written;
+ struct win_dev *pdev;
+
+ 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);
+
+ pTcon = tlink_tcon(tlink);
+
+ xid = GetXid();
+
+ full_path = build_path_from_dentry(direntry);
+ if (full_path == NULL) {
+ rc = -ENOMEM;
+ goto mknod_out;
+ }
+
+ if (pTcon->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 = (__u64) current_fsuid();
+ args.gid = (__u64) current_fsgid();
+ } else {
+ args.uid = NO_CHANGE_64;
+ args.gid = NO_CHANGE_64;
+ }
+ rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
+ cifs_sb->local_nls,
+ cifs_sb->mnt_cifs_flags &
+ CIFS_MOUNT_MAP_SPECIAL_CHR);
+ 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;
+
+
+ cFYI(1, "sfu compat create special file");
+
+ buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
+ if (buf == NULL) {
+ kfree(full_path);
+ rc = -ENOMEM;
+ FreeXid(xid);
+ return rc;
+ }
+
+ if (backup_cred(cifs_sb))
+ create_options |= CREATE_OPEN_BACKUP_INTENT;
+
+ rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_CREATE,
+ GENERIC_WRITE, create_options,
+ &fileHandle, &oplock, buf, cifs_sb->local_nls,
+ cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
+ 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.netfid = fileHandle;
+ io_parms.pid = current->tgid;
+ io_parms.tcon = pTcon;
+ io_parms.offset = 0;
+ io_parms.length = 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 = CIFSSMBWrite(xid, &io_parms,
+ &bytes_written, (char *)pdev,
+ NULL, 0);
+ } 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 = CIFSSMBWrite(xid, &io_parms,
+ &bytes_written, (char *)pdev,
+ NULL, 0);
+ } /* else if (S_ISFIFO) */
+ CIFSSMBClose(xid, pTcon, fileHandle);
+ d_drop(direntry);
+
+ /* FIXME: add code here to set EAs */
+
+mknod_out:
+ kfree(full_path);
+ kfree(buf);
+ FreeXid(xid);
+ cifs_put_tlink(tlink);
+ return rc;
+}
+
+struct dentry *
+cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
+ struct nameidata *nd)
+{
+ int xid;
+ int rc = 0; /* to get around spurious gcc warning, set to zero here */
+ __u32 oplock;
+ __u16 fileHandle = 0;
+ bool posix_open = false;
+ struct cifs_sb_info *cifs_sb;
+ struct tcon_link *tlink;
+ struct cifs_tcon *pTcon;
+ struct cifsFileInfo *cfile;
+ struct inode *newInode = NULL;
+ char *full_path = NULL;
+ struct file *filp;
+
+ xid = GetXid();
+
+ cFYI(1, "parent inode = 0x%p name is: %s and dentry = 0x%p",
+ parent_dir_inode, direntry->d_name.name, direntry);
+
+ /* check whether path exists */
+
+ cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
+ tlink = cifs_sb_tlink(cifs_sb);
+ if (IS_ERR(tlink)) {
+ FreeXid(xid);
+ return (struct dentry *)tlink;
+ }
+ pTcon = tlink_tcon(tlink);
+
+ oplock = pTcon->ses->server->oplocks ? REQ_OPLOCK : 0;
+
+ /*
+ * Don't allow the separator character in a path component.
+ * The VFS will not allow "/", but "\" is allowed by posix.
+ */
+ if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
+ int i;
+ for (i = 0; i < direntry->d_name.len; i++)
+ if (direntry->d_name.name[i] == '\\') {
+ cFYI(1, "Invalid file name");
+ rc = -EINVAL;
+ goto lookup_out;
+ }
+ }
+
+ /*
+ * O_EXCL: optimize away the lookup, but don't hash the dentry. Let
+ * the VFS handle the create.
+ */
+ if (nd && (nd->flags & LOOKUP_EXCL)) {
+ d_instantiate(direntry, NULL);
+ rc = 0;
+ 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 (direntry->d_inode != NULL) {
+ cFYI(1, "non-NULL inode in lookup");
+ } else {
+ cFYI(1, "NULL inode in lookup");
+ }
+ cFYI(1, "Full path: %s inode = 0x%p", full_path, direntry->d_inode);
+
+ /* 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 here (lookup) 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 (pTcon->unix_ext) {
+ if (nd && !(nd->flags & LOOKUP_DIRECTORY) &&
+ (nd->flags & LOOKUP_OPEN) && !pTcon->broken_posix_open &&
+ (nd->intent.open.file->f_flags & O_CREAT)) {
+ rc = cifs_posix_open(full_path, &newInode,
+ parent_dir_inode->i_sb,
+ nd->intent.open.create_mode,
+ nd->intent.open.file->f_flags, &oplock,
+ &fileHandle, xid);
+ /*
+ * The check below works around a bug in POSIX
+ * open in samba versions 3.3.1 and earlier where
+ * open could incorrectly fail with invalid parameter.
+ * If either that or op not supported returned, follow
+ * the normal lookup.
+ */
+ switch (rc) {
+ case 0:
+ /*
+ * 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.
+ */
+ if (newInode && !S_ISREG(newInode->i_mode)) {
+ CIFSSMBClose(xid, pTcon, fileHandle);
+ break;
+ }
+ case -ENOENT:
+ posix_open = true;
+ case -EOPNOTSUPP:
+ break;
+ default:
+ pTcon->broken_posix_open = true;
+ }
+ }
+ if (!posix_open)
+ 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);
+ if (posix_open) {
+ filp = lookup_instantiate_filp(nd, direntry,
+ generic_file_open);
+ if (IS_ERR(filp)) {
+ rc = PTR_ERR(filp);
+ CIFSSMBClose(xid, pTcon, fileHandle);
+ goto lookup_out;
+ }
+
+ cfile = cifs_new_fileinfo(fileHandle, filp, tlink,
+ oplock);
+ if (cfile == NULL) {
+ fput(filp);
+ CIFSSMBClose(xid, pTcon, fileHandle);
+ rc = -ENOMEM;
+ goto lookup_out;
+ }
+ }
+ /* 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) {
+ cERROR(1, "Unexpected lookup error %d", rc);
+ /* We special case check for Access Denied - since that
+ is a common return code */
+ }
+
+lookup_out:
+ kfree(full_path);
+ cifs_put_tlink(tlink);
+ FreeXid(xid);
+ return ERR_PTR(rc);
+}
+
+static int
+cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
+{
+ if (nd && (nd->flags & LOOKUP_RCU))
+ return -ECHILD;
+
+ if (direntry->d_inode) {
+ 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(direntry->d_inode) &&
+ !(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 (!nd)
+ 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 (nd->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;
+
+ cFYI(1, "In cifs d_delete, name = %s", direntry->d_name.name);
+
+ 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, const struct inode *inode,
+ struct qstr *q)
+{
+ struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
+ unsigned long hash;
+ int i;
+
+ hash = init_name_hash();
+ for (i = 0; i < q->len; i++)
+ hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
+ hash);
+ q->hash = end_name_hash(hash);
+
+ return 0;
+}
+
+static int cifs_ci_compare(const struct dentry *parent,
+ const struct inode *pinode,
+ const struct dentry *dentry, const struct inode *inode,
+ unsigned int len, const char *str, const struct qstr *name)
+{
+ struct nls_table *codepage = CIFS_SB(pinode->i_sb)->local_nls;
+
+ if ((name->len == len) &&
+ (nls_strnicmp(codepage, name->name, str, len) == 0))
+ return 0;
+ return 1;
+}
+
+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,
+};