Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3099 insertions, 0 deletions

diff --git a/fs/smb/client/inode.c b/fs/smb/client/inode.c
new file mode 100644
index 000000000..5343898ba
--- /dev/null
+++ b/fs/smb/client/inode.c
@@ -0,0 +1,3099 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ *
+ *   Copyright (C) International Business Machines  Corp., 2002,2010
+ *   Author(s): Steve French (sfrench@us.ibm.com)
+ *
+ */
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/slab.h>
+#include <linux/pagemap.h>
+#include <linux/freezer.h>
+#include <linux/sched/signal.h>
+#include <linux/wait_bit.h>
+#include <linux/fiemap.h>
+#include <asm/div64.h>
+#include "cifsfs.h"
+#include "cifspdu.h"
+#include "cifsglob.h"
+#include "cifsproto.h"
+#include "smb2proto.h"
+#include "cifs_debug.h"
+#include "cifs_fs_sb.h"
+#include "cifs_unicode.h"
+#include "fscache.h"
+#include "fs_context.h"
+#include "cifs_ioctl.h"
+#include "cached_dir.h"
+
+static void cifs_set_ops(struct inode *inode)
+{
+	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+
+	switch (inode->i_mode & S_IFMT) {
+	case S_IFREG:
+		inode->i_op = &cifs_file_inode_ops;
+		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
+			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
+				inode->i_fop = &cifs_file_direct_nobrl_ops;
+			else
+				inode->i_fop = &cifs_file_direct_ops;
+		} else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
+			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
+				inode->i_fop = &cifs_file_strict_nobrl_ops;
+			else
+				inode->i_fop = &cifs_file_strict_ops;
+		} else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
+			inode->i_fop = &cifs_file_nobrl_ops;
+		else { /* not direct, send byte range locks */
+			inode->i_fop = &cifs_file_ops;
+		}
+
+		/* check if server can support readahead */
+		if (cifs_sb_master_tcon(cifs_sb)->ses->server->max_read <
+				PAGE_SIZE + MAX_CIFS_HDR_SIZE)
+			inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
+		else
+			inode->i_data.a_ops = &cifs_addr_ops;
+		break;
+	case S_IFDIR:
+#ifdef CONFIG_CIFS_DFS_UPCALL
+		if (IS_AUTOMOUNT(inode)) {
+			inode->i_op = &cifs_dfs_referral_inode_operations;
+		} else {
+#else /* NO DFS support, treat as a directory */
+		{
+#endif
+			inode->i_op = &cifs_dir_inode_ops;
+			inode->i_fop = &cifs_dir_ops;
+		}
+		break;
+	case S_IFLNK:
+		inode->i_op = &cifs_symlink_inode_ops;
+		break;
+	default:
+		init_special_inode(inode, inode->i_mode, inode->i_rdev);
+		break;
+	}
+}
+
+/* check inode attributes against fattr. If they don't match, tag the
+ * inode for cache invalidation
+ */
+static void
+cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr)
+{
+	struct cifs_fscache_inode_coherency_data cd;
+	struct cifsInodeInfo *cifs_i = CIFS_I(inode);
+
+	cifs_dbg(FYI, "%s: revalidating inode %llu\n",
+		 __func__, cifs_i->uniqueid);
+
+	if (inode->i_state & I_NEW) {
+		cifs_dbg(FYI, "%s: inode %llu is new\n",
+			 __func__, cifs_i->uniqueid);
+		return;
+	}
+
+	/* don't bother with revalidation if we have an oplock */
+	if (CIFS_CACHE_READ(cifs_i)) {
+		cifs_dbg(FYI, "%s: inode %llu is oplocked\n",
+			 __func__, cifs_i->uniqueid);
+		return;
+	}
+
+	 /* revalidate if mtime or size have changed */
+	fattr->cf_mtime = timestamp_truncate(fattr->cf_mtime, inode);
+	if (timespec64_equal(&inode->i_mtime, &fattr->cf_mtime) &&
+	    cifs_i->server_eof == fattr->cf_eof) {
+		cifs_dbg(FYI, "%s: inode %llu is unchanged\n",
+			 __func__, cifs_i->uniqueid);
+		return;
+	}
+
+	cifs_dbg(FYI, "%s: invalidating inode %llu mapping\n",
+		 __func__, cifs_i->uniqueid);
+	set_bit(CIFS_INO_INVALID_MAPPING, &cifs_i->flags);
+	/* Invalidate fscache cookie */
+	cifs_fscache_fill_coherency(&cifs_i->netfs.inode, &cd);
+	fscache_invalidate(cifs_inode_cookie(inode), &cd, i_size_read(inode), 0);
+}
+
+/*
+ * copy nlink to the inode, unless it wasn't provided.  Provide
+ * sane values if we don't have an existing one and none was provided
+ */
+static void
+cifs_nlink_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
+{
+	/*
+	 * if we're in a situation where we can't trust what we
+	 * got from the server (readdir, some non-unix cases)
+	 * fake reasonable values
+	 */
+	if (fattr->cf_flags & CIFS_FATTR_UNKNOWN_NLINK) {
+		/* only provide fake values on a new inode */
+		if (inode->i_state & I_NEW) {
+			if (fattr->cf_cifsattrs & ATTR_DIRECTORY)
+				set_nlink(inode, 2);
+			else
+				set_nlink(inode, 1);
+		}
+		return;
+	}
+
+	/* we trust the server, so update it */
+	set_nlink(inode, fattr->cf_nlink);
+}
+
+/* populate an inode with info from a cifs_fattr struct */
+int
+cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
+{
+	struct cifsInodeInfo *cifs_i = CIFS_I(inode);
+	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+
+	if (!(inode->i_state & I_NEW) &&
+	    unlikely(inode_wrong_type(inode, fattr->cf_mode))) {
+		CIFS_I(inode)->time = 0; /* force reval */
+		return -ESTALE;
+	}
+
+	cifs_revalidate_cache(inode, fattr);
+
+	spin_lock(&inode->i_lock);
+	fattr->cf_mtime = timestamp_truncate(fattr->cf_mtime, inode);
+	fattr->cf_atime = timestamp_truncate(fattr->cf_atime, inode);
+	fattr->cf_ctime = timestamp_truncate(fattr->cf_ctime, inode);
+	/* we do not want atime to be less than mtime, it broke some apps */
+	if (timespec64_compare(&fattr->cf_atime, &fattr->cf_mtime) < 0)
+		inode->i_atime = fattr->cf_mtime;
+	else
+		inode->i_atime = fattr->cf_atime;
+	inode->i_mtime = fattr->cf_mtime;
+	inode->i_ctime = fattr->cf_ctime;
+	inode->i_rdev = fattr->cf_rdev;
+	cifs_nlink_fattr_to_inode(inode, fattr);
+	inode->i_uid = fattr->cf_uid;
+	inode->i_gid = fattr->cf_gid;
+
+	/* if dynperm is set, don't clobber existing mode */
+	if (inode->i_state & I_NEW ||
+	    !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM))
+		inode->i_mode = fattr->cf_mode;
+
+	cifs_i->cifsAttrs = fattr->cf_cifsattrs;
+
+	if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
+		cifs_i->time = 0;
+	else
+		cifs_i->time = jiffies;
+
+	if (fattr->cf_flags & CIFS_FATTR_DELETE_PENDING)
+		set_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags);
+	else
+		clear_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags);
+
+	cifs_i->server_eof = fattr->cf_eof;
+	/*
+	 * Can't safely change the file size here if the client is writing to
+	 * it due to potential races.
+	 */
+	if (is_size_safe_to_change(cifs_i, fattr->cf_eof)) {
+		i_size_write(inode, fattr->cf_eof);
+
+		/*
+		 * i_blocks is not related to (i_size / i_blksize),
+		 * but instead 512 byte (2**9) size is required for
+		 * calculating num blocks.
+		 */
+		inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9;
+	}
+
+	if (S_ISLNK(fattr->cf_mode)) {
+		kfree(cifs_i->symlink_target);
+		cifs_i->symlink_target = fattr->cf_symlink_target;
+		fattr->cf_symlink_target = NULL;
+	}
+	spin_unlock(&inode->i_lock);
+
+	if (fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL)
+		inode->i_flags |= S_AUTOMOUNT;
+	if (inode->i_state & I_NEW)
+		cifs_set_ops(inode);
+	return 0;
+}
+
+void
+cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr)
+{
+	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+
+	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
+		return;
+
+	fattr->cf_uniqueid = iunique(sb, ROOT_I);
+}
+
+/* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */
+void
+cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
+			 struct cifs_sb_info *cifs_sb)
+{
+	memset(fattr, 0, sizeof(*fattr));
+	fattr->cf_uniqueid = le64_to_cpu(info->UniqueId);
+	fattr->cf_bytes = le64_to_cpu(info->NumOfBytes);
+	fattr->cf_eof = le64_to_cpu(info->EndOfFile);
+
+	fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
+	fattr->cf_mtime = cifs_NTtimeToUnix(info->LastModificationTime);
+	fattr->cf_ctime = cifs_NTtimeToUnix(info->LastStatusChange);
+	/* old POSIX extensions don't get create time */
+
+	fattr->cf_mode = le64_to_cpu(info->Permissions);
+
+	/*
+	 * Since we set the inode type below we need to mask off
+	 * to avoid strange results if bits set above.
+	 */
+	fattr->cf_mode &= ~S_IFMT;
+	switch (le32_to_cpu(info->Type)) {
+	case UNIX_FILE:
+		fattr->cf_mode |= S_IFREG;
+		fattr->cf_dtype = DT_REG;
+		break;
+	case UNIX_SYMLINK:
+		fattr->cf_mode |= S_IFLNK | cifs_sb->ctx->file_mode;
+		fattr->cf_dtype = DT_LNK;
+		break;
+	case UNIX_DIR:
+		fattr->cf_mode |= S_IFDIR;
+		fattr->cf_dtype = DT_DIR;
+		break;
+	case UNIX_CHARDEV:
+		fattr->cf_mode |= S_IFCHR;
+		fattr->cf_dtype = DT_CHR;
+		fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
+				       le64_to_cpu(info->DevMinor) & MINORMASK);
+		break;
+	case UNIX_BLOCKDEV:
+		fattr->cf_mode |= S_IFBLK;
+		fattr->cf_dtype = DT_BLK;
+		fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
+				       le64_to_cpu(info->DevMinor) & MINORMASK);
+		break;
+	case UNIX_FIFO:
+		fattr->cf_mode |= S_IFIFO;
+		fattr->cf_dtype = DT_FIFO;
+		break;
+	case UNIX_SOCKET:
+		fattr->cf_mode |= S_IFSOCK;
+		fattr->cf_dtype = DT_SOCK;
+		break;
+	default:
+		/* safest to call it a file if we do not know */
+		fattr->cf_mode |= S_IFREG;
+		fattr->cf_dtype = DT_REG;
+		cifs_dbg(FYI, "unknown type %d\n", le32_to_cpu(info->Type));
+		break;
+	}
+
+	fattr->cf_uid = cifs_sb->ctx->linux_uid;
+	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)) {
+		u64 id = le64_to_cpu(info->Uid);
+		if (id < ((uid_t)-1)) {
+			kuid_t uid = make_kuid(&init_user_ns, id);
+			if (uid_valid(uid))
+				fattr->cf_uid = uid;
+		}
+	}
+
+	fattr->cf_gid = cifs_sb->ctx->linux_gid;
+	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)) {
+		u64 id = le64_to_cpu(info->Gid);
+		if (id < ((gid_t)-1)) {
+			kgid_t gid = make_kgid(&init_user_ns, id);
+			if (gid_valid(gid))
+				fattr->cf_gid = gid;
+		}
+	}
+
+	fattr->cf_nlink = le64_to_cpu(info->Nlinks);
+}
+
+/*
+ * Fill a cifs_fattr struct with fake inode info.
+ *
+ * Needed to setup cifs_fattr data for the directory which is the
+ * junction to the new submount (ie to setup the fake directory
+ * which represents a DFS referral).
+ */
+static void
+cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
+{
+	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+
+	cifs_dbg(FYI, "creating fake fattr for DFS referral\n");
+
+	memset(fattr, 0, sizeof(*fattr));
+	fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
+	fattr->cf_uid = cifs_sb->ctx->linux_uid;
+	fattr->cf_gid = cifs_sb->ctx->linux_gid;
+	ktime_get_coarse_real_ts64(&fattr->cf_mtime);
+	fattr->cf_atime = fattr->cf_ctime = fattr->cf_mtime;
+	fattr->cf_nlink = 2;
+	fattr->cf_flags = CIFS_FATTR_DFS_REFERRAL;
+}
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+static int
+cifs_get_file_info_unix(struct file *filp)
+{
+	int rc;
+	unsigned int xid;
+	FILE_UNIX_BASIC_INFO find_data;
+	struct cifs_fattr fattr = {};
+	struct inode *inode = file_inode(filp);
+	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+	struct cifsFileInfo *cfile = filp->private_data;
+	struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
+
+	xid = get_xid();
+
+	if (cfile->symlink_target) {
+		fattr.cf_symlink_target = kstrdup(cfile->symlink_target, GFP_KERNEL);
+		if (!fattr.cf_symlink_target) {
+			rc = -ENOMEM;
+			goto cifs_gfiunix_out;
+		}
+	}
+
+	rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->fid.netfid, &find_data);
+	if (!rc) {
+		cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
+	} else if (rc == -EREMOTE) {
+		cifs_create_dfs_fattr(&fattr, inode->i_sb);
+		rc = 0;
+	} else
+		goto cifs_gfiunix_out;
+
+	rc = cifs_fattr_to_inode(inode, &fattr);
+
+cifs_gfiunix_out:
+	free_xid(xid);
+	return rc;
+}
+
+int cifs_get_inode_info_unix(struct inode **pinode,
+			     const unsigned char *full_path,
+			     struct super_block *sb, unsigned int xid)
+{
+	int rc;
+	FILE_UNIX_BASIC_INFO find_data;
+	struct cifs_fattr fattr;
+	struct cifs_tcon *tcon;
+	struct TCP_Server_Info *server;
+	struct tcon_link *tlink;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+
+	cifs_dbg(FYI, "Getting info on %s\n", full_path);
+
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	tcon = tlink_tcon(tlink);
+	server = tcon->ses->server;
+
+	/* could have done a find first instead but this returns more info */
+	rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data,
+				  cifs_sb->local_nls, cifs_remap(cifs_sb));
+	cifs_dbg(FYI, "%s: query path info: rc = %d\n", __func__, rc);
+	cifs_put_tlink(tlink);
+
+	if (!rc) {
+		cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
+	} else if (rc == -EREMOTE) {
+		cifs_create_dfs_fattr(&fattr, sb);
+		rc = 0;
+	} else {
+		return rc;
+	}
+
+	/* check for Minshall+French symlinks */
+	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
+		int tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
+					     full_path);
+		if (tmprc)
+			cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
+	}
+
+	if (S_ISLNK(fattr.cf_mode) && !fattr.cf_symlink_target) {
+		if (!server->ops->query_symlink)
+			return -EOPNOTSUPP;
+		rc = server->ops->query_symlink(xid, tcon, cifs_sb, full_path,
+						&fattr.cf_symlink_target, false);
+		if (rc) {
+			cifs_dbg(FYI, "%s: query_symlink: %d\n", __func__, rc);
+			goto cgiiu_exit;
+		}
+	}
+
+	if (*pinode == NULL) {
+		/* get new inode */
+		cifs_fill_uniqueid(sb, &fattr);
+		*pinode = cifs_iget(sb, &fattr);
+		if (!*pinode)
+			rc = -ENOMEM;
+	} else {
+		/* we already have inode, update it */
+
+		/* if uniqueid is different, return error */
+		if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM &&
+		    CIFS_I(*pinode)->uniqueid != fattr.cf_uniqueid)) {
+			CIFS_I(*pinode)->time = 0; /* force reval */
+			rc = -ESTALE;
+			goto cgiiu_exit;
+		}
+
+		/* if filetype is different, return error */
+		rc = cifs_fattr_to_inode(*pinode, &fattr);
+	}
+
+cgiiu_exit:
+	kfree(fattr.cf_symlink_target);
+	return rc;
+}
+#else
+int cifs_get_inode_info_unix(struct inode **pinode,
+			     const unsigned char *full_path,
+			     struct super_block *sb, unsigned int xid)
+{
+	return -EOPNOTSUPP;
+}
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+static int
+cifs_sfu_type(struct cifs_fattr *fattr, const char *path,
+	      struct cifs_sb_info *cifs_sb, unsigned int xid)
+{
+	int rc;
+	__u32 oplock;
+	struct tcon_link *tlink;
+	struct cifs_tcon *tcon;
+	struct cifs_fid fid;
+	struct cifs_open_parms oparms;
+	struct cifs_io_parms io_parms = {0};
+	char buf[24];
+	unsigned int bytes_read;
+	char *pbuf;
+	int buf_type = CIFS_NO_BUFFER;
+
+	pbuf = buf;
+
+	fattr->cf_mode &= ~S_IFMT;
+
+	if (fattr->cf_eof == 0) {
+		fattr->cf_mode |= S_IFIFO;
+		fattr->cf_dtype = DT_FIFO;
+		return 0;
+	} else if (fattr->cf_eof < 8) {
+		fattr->cf_mode |= S_IFREG;
+		fattr->cf_dtype = DT_REG;
+		return -EINVAL;	 /* EOPNOTSUPP? */
+	}
+
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	tcon = tlink_tcon(tlink);
+
+	oparms = (struct cifs_open_parms) {
+		.tcon = tcon,
+		.cifs_sb = cifs_sb,
+		.desired_access = GENERIC_READ,
+		.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR),
+		.disposition = FILE_OPEN,
+		.path = path,
+		.fid = &fid,
+	};
+
+	if (tcon->ses->server->oplocks)
+		oplock = REQ_OPLOCK;
+	else
+		oplock = 0;
+	rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, NULL);
+	if (rc) {
+		cifs_dbg(FYI, "check sfu type of %s, open rc = %d\n", path, rc);
+		cifs_put_tlink(tlink);
+		return rc;
+	}
+
+	/* Read header */
+	io_parms.netfid = fid.netfid;
+	io_parms.pid = current->tgid;
+	io_parms.tcon = tcon;
+	io_parms.offset = 0;
+	io_parms.length = 24;
+
+	rc = tcon->ses->server->ops->sync_read(xid, &fid, &io_parms,
+					&bytes_read, &pbuf, &buf_type);
+	if ((rc == 0) && (bytes_read >= 8)) {
+		if (memcmp("IntxBLK", pbuf, 8) == 0) {
+			cifs_dbg(FYI, "Block device\n");
+			fattr->cf_mode |= S_IFBLK;
+			fattr->cf_dtype = DT_BLK;
+			if (bytes_read == 24) {
+				/* we have enough to decode dev num */
+				__u64 mjr; /* major */
+				__u64 mnr; /* minor */
+				mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
+				mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
+				fattr->cf_rdev = MKDEV(mjr, mnr);
+			}
+		} else if (memcmp("IntxCHR", pbuf, 8) == 0) {
+			cifs_dbg(FYI, "Char device\n");
+			fattr->cf_mode |= S_IFCHR;
+			fattr->cf_dtype = DT_CHR;
+			if (bytes_read == 24) {
+				/* we have enough to decode dev num */
+				__u64 mjr; /* major */
+				__u64 mnr; /* minor */
+				mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
+				mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
+				fattr->cf_rdev = MKDEV(mjr, mnr);
+			}
+		} else if (memcmp("IntxLNK", pbuf, 7) == 0) {
+			cifs_dbg(FYI, "Symlink\n");
+			fattr->cf_mode |= S_IFLNK;
+			fattr->cf_dtype = DT_LNK;
+		} else if (memcmp("LnxFIFO", pbuf, 8) == 0) {
+			cifs_dbg(FYI, "FIFO\n");
+			fattr->cf_mode |= S_IFIFO;
+			fattr->cf_dtype = DT_FIFO;
+		} else {
+			fattr->cf_mode |= S_IFREG; /* file? */
+			fattr->cf_dtype = DT_REG;
+			rc = -EOPNOTSUPP;
+		}
+	} else {
+		fattr->cf_mode |= S_IFREG; /* then it is a file */
+		fattr->cf_dtype = DT_REG;
+		rc = -EOPNOTSUPP; /* or some unknown SFU type */
+	}
+
+	tcon->ses->server->ops->close(xid, tcon, &fid);
+	cifs_put_tlink(tlink);
+	return rc;
+}
+
+#define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID)  /* SETFILEBITS valid bits */
+
+/*
+ * Fetch mode bits as provided by SFU.
+ *
+ * FIXME: Doesn't this clobber the type bit we got from cifs_sfu_type ?
+ */
+static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
+			 struct cifs_sb_info *cifs_sb, unsigned int xid)
+{
+#ifdef CONFIG_CIFS_XATTR
+	ssize_t rc;
+	char ea_value[4];
+	__u32 mode;
+	struct tcon_link *tlink;
+	struct cifs_tcon *tcon;
+
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	tcon = tlink_tcon(tlink);
+
+	if (tcon->ses->server->ops->query_all_EAs == NULL) {
+		cifs_put_tlink(tlink);
+		return -EOPNOTSUPP;
+	}
+
+	rc = tcon->ses->server->ops->query_all_EAs(xid, tcon, path,
+			"SETFILEBITS", ea_value, 4 /* size of buf */,
+			cifs_sb);
+	cifs_put_tlink(tlink);
+	if (rc < 0)
+		return (int)rc;
+	else if (rc > 3) {
+		mode = le32_to_cpu(*((__le32 *)ea_value));
+		fattr->cf_mode &= ~SFBITS_MASK;
+		cifs_dbg(FYI, "special bits 0%o org mode 0%o\n",
+			 mode, fattr->cf_mode);
+		fattr->cf_mode = (mode & SFBITS_MASK) | fattr->cf_mode;
+		cifs_dbg(FYI, "special mode bits 0%o\n", mode);
+	}
+
+	return 0;
+#else
+	return -EOPNOTSUPP;
+#endif
+}
+
+/* Fill a cifs_fattr struct with info from POSIX info struct */
+static void smb311_posix_info_to_fattr(struct cifs_fattr *fattr, struct cifs_open_info_data *data,
+				       struct super_block *sb, bool adjust_tz, bool symlink)
+{
+	struct smb311_posix_qinfo *info = &data->posix_fi;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
+
+	memset(fattr, 0, sizeof(*fattr));
+
+	/* no fattr->flags to set */
+	fattr->cf_cifsattrs = le32_to_cpu(info->DosAttributes);
+	fattr->cf_uniqueid = le64_to_cpu(info->Inode);
+
+	if (info->LastAccessTime)
+		fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
+	else
+		ktime_get_coarse_real_ts64(&fattr->cf_atime);
+
+	fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
+	fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
+
+	if (adjust_tz) {
+		fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
+		fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
+	}
+
+	fattr->cf_eof = le64_to_cpu(info->EndOfFile);
+	fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
+	fattr->cf_createtime = le64_to_cpu(info->CreationTime);
+
+	fattr->cf_nlink = le32_to_cpu(info->HardLinks);
+	fattr->cf_mode = (umode_t) le32_to_cpu(info->Mode);
+	/* The srv fs device id is overridden on network mount so setting rdev isn't needed here */
+	/* fattr->cf_rdev = le32_to_cpu(info->DeviceId); */
+
+	if (symlink) {
+		fattr->cf_mode |= S_IFLNK;
+		fattr->cf_dtype = DT_LNK;
+		fattr->cf_symlink_target = data->symlink_target;
+		data->symlink_target = NULL;
+	} else if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
+		fattr->cf_mode |= S_IFDIR;
+		fattr->cf_dtype = DT_DIR;
+	} else { /* file */
+		fattr->cf_mode |= S_IFREG;
+		fattr->cf_dtype = DT_REG;
+	}
+	/* else if reparse point ... TODO: add support for FIFO and blk dev; special file types */
+
+	fattr->cf_uid = cifs_sb->ctx->linux_uid; /* TODO: map uid and gid from SID */
+	fattr->cf_gid = cifs_sb->ctx->linux_gid;
+
+	cifs_dbg(FYI, "POSIX query info: mode 0x%x uniqueid 0x%llx nlink %d\n",
+		fattr->cf_mode, fattr->cf_uniqueid, fattr->cf_nlink);
+}
+
+static void cifs_open_info_to_fattr(struct cifs_fattr *fattr, struct cifs_open_info_data *data,
+				    struct super_block *sb, bool adjust_tz, bool symlink,
+				    u32 reparse_tag)
+{
+	struct smb2_file_all_info *info = &data->fi;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
+
+	memset(fattr, 0, sizeof(*fattr));
+	fattr->cf_cifsattrs = le32_to_cpu(info->Attributes);
+	if (info->DeletePending)
+		fattr->cf_flags |= CIFS_FATTR_DELETE_PENDING;
+
+	if (info->LastAccessTime)
+		fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
+	else
+		ktime_get_coarse_real_ts64(&fattr->cf_atime);
+
+	fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
+	fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
+
+	if (adjust_tz) {
+		fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
+		fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
+	}
+
+	fattr->cf_eof = le64_to_cpu(info->EndOfFile);
+	fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
+	fattr->cf_createtime = le64_to_cpu(info->CreationTime);
+
+	fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
+	if (reparse_tag == IO_REPARSE_TAG_LX_SYMLINK) {
+		fattr->cf_mode |= S_IFLNK | cifs_sb->ctx->file_mode;
+		fattr->cf_dtype = DT_LNK;
+	} else if (reparse_tag == IO_REPARSE_TAG_LX_FIFO) {
+		fattr->cf_mode |= S_IFIFO | cifs_sb->ctx->file_mode;
+		fattr->cf_dtype = DT_FIFO;
+	} else if (reparse_tag == IO_REPARSE_TAG_AF_UNIX) {
+		fattr->cf_mode |= S_IFSOCK | cifs_sb->ctx->file_mode;
+		fattr->cf_dtype = DT_SOCK;
+	} else if (reparse_tag == IO_REPARSE_TAG_LX_CHR) {
+		fattr->cf_mode |= S_IFCHR | cifs_sb->ctx->file_mode;
+		fattr->cf_dtype = DT_CHR;
+	} else if (reparse_tag == IO_REPARSE_TAG_LX_BLK) {
+		fattr->cf_mode |= S_IFBLK | cifs_sb->ctx->file_mode;
+		fattr->cf_dtype = DT_BLK;
+	} else if (symlink || reparse_tag == IO_REPARSE_TAG_SYMLINK ||
+		   reparse_tag == IO_REPARSE_TAG_NFS) {
+		fattr->cf_mode = S_IFLNK;
+		fattr->cf_dtype = DT_LNK;
+	} else if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
+		fattr->cf_mode = S_IFDIR | cifs_sb->ctx->dir_mode;
+		fattr->cf_dtype = DT_DIR;
+		/*
+		 * Server can return wrong NumberOfLinks value for directories
+		 * when Unix extensions are disabled - fake it.
+		 */
+		if (!tcon->unix_ext)
+			fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
+	} else {
+		fattr->cf_mode = S_IFREG | cifs_sb->ctx->file_mode;
+		fattr->cf_dtype = DT_REG;
+
+		/* clear write bits if ATTR_READONLY is set */
+		if (fattr->cf_cifsattrs & ATTR_READONLY)
+			fattr->cf_mode &= ~(S_IWUGO);
+
+		/*
+		 * Don't accept zero nlink from non-unix servers unless
+		 * delete is pending.  Instead mark it as unknown.
+		 */
+		if ((fattr->cf_nlink < 1) && !tcon->unix_ext &&
+		    !info->DeletePending) {
+			cifs_dbg(VFS, "bogus file nlink value %u\n",
+				 fattr->cf_nlink);
+			fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
+		}
+	}
+
+	if (S_ISLNK(fattr->cf_mode)) {
+		if (likely(data->symlink_target))
+			fattr->cf_eof = strnlen(data->symlink_target, PATH_MAX);
+		fattr->cf_symlink_target = data->symlink_target;
+		data->symlink_target = NULL;
+	}
+
+	fattr->cf_uid = cifs_sb->ctx->linux_uid;
+	fattr->cf_gid = cifs_sb->ctx->linux_gid;
+}
+
+static int
+cifs_get_file_info(struct file *filp)
+{
+	int rc;
+	unsigned int xid;
+	struct cifs_open_info_data data = {};
+	struct cifs_fattr fattr;
+	struct inode *inode = file_inode(filp);
+	struct cifsFileInfo *cfile = filp->private_data;
+	struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
+	struct TCP_Server_Info *server = tcon->ses->server;
+	bool symlink = false;
+	u32 tag = 0;
+
+	if (!server->ops->query_file_info)
+		return -ENOSYS;
+
+	xid = get_xid();
+	rc = server->ops->query_file_info(xid, tcon, cfile, &data);
+	switch (rc) {
+	case 0:
+		/* TODO: add support to query reparse tag */
+		if (data.symlink_target) {
+			symlink = true;
+			tag = IO_REPARSE_TAG_SYMLINK;
+		}
+		cifs_open_info_to_fattr(&fattr, &data, inode->i_sb, false, symlink, tag);
+		break;
+	case -EREMOTE:
+		cifs_create_dfs_fattr(&fattr, inode->i_sb);
+		rc = 0;
+		break;
+	case -EOPNOTSUPP:
+	case -EINVAL:
+		/*
+		 * FIXME: legacy server -- fall back to path-based call?
+		 * for now, just skip revalidating and mark inode for
+		 * immediate reval.
+		 */
+		rc = 0;
+		CIFS_I(inode)->time = 0;
+		goto cgfi_exit;
+	default:
+		goto cgfi_exit;
+	}
+
+	/*
+	 * don't bother with SFU junk here -- just mark inode as needing
+	 * revalidation.
+	 */
+	fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
+	fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
+	/* if filetype is different, return error */
+	rc = cifs_fattr_to_inode(inode, &fattr);
+cgfi_exit:
+	cifs_free_open_info(&data);
+	free_xid(xid);
+	return rc;
+}
+
+/* Simple function to return a 64 bit hash of string.  Rarely called */
+static __u64 simple_hashstr(const char *str)
+{
+	const __u64 hash_mult =  1125899906842597ULL; /* a big enough prime */
+	__u64 hash = 0;
+
+	while (*str)
+		hash = (hash + (__u64) *str++) * hash_mult;
+
+	return hash;
+}
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+/**
+ * cifs_backup_query_path_info - SMB1 fallback code to get ino
+ *
+ * Fallback code to get file metadata when we don't have access to
+ * full_path (EACCES) and have backup creds.
+ *
+ * @xid:	transaction id used to identify original request in logs
+ * @tcon:	information about the server share we have mounted
+ * @sb:	the superblock stores info such as disk space available
+ * @full_path:	name of the file we are getting the metadata for
+ * @resp_buf:	will be set to cifs resp buf and needs to be freed with
+ * 		cifs_buf_release() when done with @data
+ * @data:	will be set to search info result buffer
+ */
+static int
+cifs_backup_query_path_info(int xid,
+			    struct cifs_tcon *tcon,
+			    struct super_block *sb,
+			    const char *full_path,
+			    void **resp_buf,
+			    FILE_ALL_INFO **data)
+{
+	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+	struct cifs_search_info info = {0};
+	u16 flags;
+	int rc;
+
+	*resp_buf = NULL;
+	info.endOfSearch = false;
+	if (tcon->unix_ext)
+		info.info_level = SMB_FIND_FILE_UNIX;
+	else if ((tcon->ses->capabilities &
+		  tcon->ses->server->vals->cap_nt_find) == 0)
+		info.info_level = SMB_FIND_FILE_INFO_STANDARD;
+	else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
+		info.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
+	else /* no srvino useful for fallback to some netapp */
+		info.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
+
+	flags = CIFS_SEARCH_CLOSE_ALWAYS |
+		CIFS_SEARCH_CLOSE_AT_END |
+		CIFS_SEARCH_BACKUP_SEARCH;
+
+	rc = CIFSFindFirst(xid, tcon, full_path,
+			   cifs_sb, NULL, flags, &info, false);
+	if (rc)
+		return rc;
+
+	*resp_buf = (void *)info.ntwrk_buf_start;
+	*data = (FILE_ALL_INFO *)info.srch_entries_start;
+	return 0;
+}
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+static void cifs_set_fattr_ino(int xid, struct cifs_tcon *tcon, struct super_block *sb,
+			       struct inode **inode, const char *full_path,
+			       struct cifs_open_info_data *data, struct cifs_fattr *fattr)
+{
+	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+	struct TCP_Server_Info *server = tcon->ses->server;
+	int rc;
+
+	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
+		if (*inode)
+			fattr->cf_uniqueid = CIFS_I(*inode)->uniqueid;
+		else
+			fattr->cf_uniqueid = iunique(sb, ROOT_I);
+		return;
+	}
+
+	/*
+	 * If we have an inode pass a NULL tcon to ensure we don't
+	 * make a round trip to the server. This only works for SMB2+.
+	 */
+	rc = server->ops->get_srv_inum(xid, *inode ? NULL : tcon, cifs_sb, full_path,
+				       &fattr->cf_uniqueid, data);
+	if (rc) {
+		/*
+		 * If that fails reuse existing ino or generate one
+		 * and disable server ones
+		 */
+		if (*inode)
+			fattr->cf_uniqueid = CIFS_I(*inode)->uniqueid;
+		else {
+			fattr->cf_uniqueid = iunique(sb, ROOT_I);
+			cifs_autodisable_serverino(cifs_sb);
+		}
+		return;
+	}
+
+	/* If no errors, check for zero root inode (invalid) */
+	if (fattr->cf_uniqueid == 0 && strlen(full_path) == 0) {
+		cifs_dbg(FYI, "Invalid (0) inodenum\n");
+		if (*inode) {
+			/* reuse */
+			fattr->cf_uniqueid = CIFS_I(*inode)->uniqueid;
+		} else {
+			/* make an ino by hashing the UNC */
+			fattr->cf_flags |= CIFS_FATTR_FAKE_ROOT_INO;
+			fattr->cf_uniqueid = simple_hashstr(tcon->tree_name);
+		}
+	}
+}
+
+static inline bool is_inode_cache_good(struct inode *ino)
+{
+	return ino && CIFS_CACHE_READ(CIFS_I(ino)) && CIFS_I(ino)->time != 0;
+}
+
+int cifs_get_inode_info(struct inode **inode, const char *full_path,
+			struct cifs_open_info_data *data, struct super_block *sb, int xid,
+			const struct cifs_fid *fid)
+{
+	struct cifs_tcon *tcon;
+	struct TCP_Server_Info *server;
+	struct tcon_link *tlink;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+	bool adjust_tz = false;
+	struct cifs_fattr fattr = {0};
+	bool is_reparse_point = false;
+	struct cifs_open_info_data tmp_data = {};
+	void *smb1_backup_rsp_buf = NULL;
+	int rc = 0;
+	int tmprc = 0;
+	__u32 reparse_tag = 0;
+
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	tcon = tlink_tcon(tlink);
+	server = tcon->ses->server;
+
+	/*
+	 * 1. Fetch file metadata if not provided (data)
+	 */
+
+	if (!data) {
+		if (is_inode_cache_good(*inode)) {
+			cifs_dbg(FYI, "No need to revalidate cached inode sizes\n");
+			goto out;
+		}
+		rc = server->ops->query_path_info(xid, tcon, cifs_sb, full_path, &tmp_data,
+						  &adjust_tz, &is_reparse_point);
+		data = &tmp_data;
+	}
+
+	/*
+	 * 2. Convert it to internal cifs metadata (fattr)
+	 */
+
+	switch (rc) {
+	case 0:
+		/*
+		 * If the file is a reparse point, it is more complicated
+		 * since we have to check if its reparse tag matches a known
+		 * special file type e.g. symlink or fifo or char etc.
+		 */
+		if (is_reparse_point && data->symlink_target) {
+			reparse_tag = IO_REPARSE_TAG_SYMLINK;
+		} else if ((le32_to_cpu(data->fi.Attributes) & ATTR_REPARSE) &&
+			   server->ops->query_reparse_tag) {
+			tmprc = server->ops->query_reparse_tag(xid, tcon, cifs_sb, full_path,
+							    &reparse_tag);
+			if (tmprc)
+				cifs_dbg(FYI, "%s: query_reparse_tag: rc = %d\n", __func__, tmprc);
+			if (server->ops->query_symlink) {
+				tmprc = server->ops->query_symlink(xid, tcon, cifs_sb, full_path,
+								   &data->symlink_target,
+								   is_reparse_point);
+				if (tmprc)
+					cifs_dbg(FYI, "%s: query_symlink: rc = %d\n", __func__,
+						 tmprc);
+			}
+		}
+		cifs_open_info_to_fattr(&fattr, data, sb, adjust_tz, is_reparse_point, reparse_tag);
+		break;
+	case -EREMOTE:
+		/* DFS link, no metadata available on this server */
+		cifs_create_dfs_fattr(&fattr, sb);
+		rc = 0;
+		break;
+	case -EACCES:
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+		/*
+		 * perm errors, try again with backup flags if possible
+		 *
+		 * For SMB2 and later the backup intent flag
+		 * is already sent if needed on open and there
+		 * is no path based FindFirst operation to use
+		 * to retry with
+		 */
+		if (backup_cred(cifs_sb) && is_smb1_server(server)) {
+			/* for easier reading */
+			FILE_ALL_INFO *fi;
+			FILE_DIRECTORY_INFO *fdi;
+			SEARCH_ID_FULL_DIR_INFO *si;
+
+			rc = cifs_backup_query_path_info(xid, tcon, sb,
+							 full_path,
+							 &smb1_backup_rsp_buf,
+							 &fi);
+			if (rc)
+				goto out;
+
+			move_cifs_info_to_smb2(&data->fi, fi);
+			fdi = (FILE_DIRECTORY_INFO *)fi;
+			si = (SEARCH_ID_FULL_DIR_INFO *)fi;
+
+			cifs_dir_info_to_fattr(&fattr, fdi, cifs_sb);
+			fattr.cf_uniqueid = le64_to_cpu(si->UniqueId);
+			/* uniqueid set, skip get inum step */
+			goto handle_mnt_opt;
+		} else {
+			/* nothing we can do, bail out */
+			goto out;
+		}
+#else
+		goto out;
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+		break;
+	default:
+		cifs_dbg(FYI, "%s: unhandled err rc %d\n", __func__, rc);
+		goto out;
+	}
+
+	/*
+	 * 3. Get or update inode number (fattr.cf_uniqueid)
+	 */
+
+	cifs_set_fattr_ino(xid, tcon, sb, inode, full_path, data, &fattr);
+
+	/*
+	 * 4. Tweak fattr based on mount options
+	 */
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+handle_mnt_opt:
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+	/* query for SFU type info if supported and needed */
+	if (fattr.cf_cifsattrs & ATTR_SYSTEM &&
+	    cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
+		tmprc = cifs_sfu_type(&fattr, full_path, cifs_sb, xid);
+		if (tmprc)
+			cifs_dbg(FYI, "cifs_sfu_type failed: %d\n", tmprc);
+	}
+
+	/* fill in 0777 bits from ACL */
+	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) {
+		rc = cifs_acl_to_fattr(cifs_sb, &fattr, *inode, true,
+				       full_path, fid);
+		if (rc == -EREMOTE)
+			rc = 0;
+		if (rc) {
+			cifs_dbg(FYI, "%s: Get mode from SID failed. rc=%d\n",
+				 __func__, rc);
+			goto out;
+		}
+	} else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
+		rc = cifs_acl_to_fattr(cifs_sb, &fattr, *inode, false,
+				       full_path, fid);
+		if (rc == -EREMOTE)
+			rc = 0;
+		if (rc) {
+			cifs_dbg(FYI, "%s: Getting ACL failed with error: %d\n",
+				 __func__, rc);
+			goto out;
+		}
+	}
+
+	/* fill in remaining high mode bits e.g. SUID, VTX */
+	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
+		cifs_sfu_mode(&fattr, full_path, cifs_sb, xid);
+
+	/* check for Minshall+French symlinks */
+	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
+		tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
+					 full_path);
+		if (tmprc)
+			cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
+	}
+
+	/*
+	 * 5. Update inode with final fattr data
+	 */
+
+	if (!*inode) {
+		*inode = cifs_iget(sb, &fattr);
+		if (!*inode)
+			rc = -ENOMEM;
+	} else {
+		/* we already have inode, update it */
+
+		/* if uniqueid is different, return error */
+		if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM &&
+		    CIFS_I(*inode)->uniqueid != fattr.cf_uniqueid)) {
+			CIFS_I(*inode)->time = 0; /* force reval */
+			rc = -ESTALE;
+			goto out;
+		}
+		/* if filetype is different, return error */
+		rc = cifs_fattr_to_inode(*inode, &fattr);
+	}
+out:
+	cifs_buf_release(smb1_backup_rsp_buf);
+	cifs_put_tlink(tlink);
+	cifs_free_open_info(&tmp_data);
+	kfree(fattr.cf_symlink_target);
+	return rc;
+}
+
+int
+smb311_posix_get_inode_info(struct inode **inode,
+		    const char *full_path,
+		    struct super_block *sb, unsigned int xid)
+{
+	struct cifs_tcon *tcon;
+	struct tcon_link *tlink;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+	bool adjust_tz = false;
+	struct cifs_fattr fattr = {0};
+	bool symlink = false;
+	struct cifs_open_info_data data = {};
+	int rc = 0;
+	int tmprc = 0;
+
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	tcon = tlink_tcon(tlink);
+
+	/*
+	 * 1. Fetch file metadata
+	 */
+
+	if (is_inode_cache_good(*inode)) {
+		cifs_dbg(FYI, "No need to revalidate cached inode sizes\n");
+		goto out;
+	}
+
+	rc = smb311_posix_query_path_info(xid, tcon, cifs_sb, full_path, &data, &adjust_tz,
+					  &symlink);
+
+	/*
+	 * 2. Convert it to internal cifs metadata (fattr)
+	 */
+
+	switch (rc) {
+	case 0:
+		smb311_posix_info_to_fattr(&fattr, &data, sb, adjust_tz, symlink);
+		break;
+	case -EREMOTE:
+		/* DFS link, no metadata available on this server */
+		cifs_create_dfs_fattr(&fattr, sb);
+		rc = 0;
+		break;
+	case -EACCES:
+		/*
+		 * For SMB2 and later the backup intent flag
+		 * is already sent if needed on open and there
+		 * is no path based FindFirst operation to use
+		 * to retry with so nothing we can do, bail out
+		 */
+		goto out;
+	default:
+		cifs_dbg(FYI, "%s: unhandled err rc %d\n", __func__, rc);
+		goto out;
+	}
+
+
+	/*
+	 * 3. Tweak fattr based on mount options
+	 */
+
+	/* check for Minshall+French symlinks */
+	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
+		tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
+					 full_path);
+		if (tmprc)
+			cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
+	}
+
+	/*
+	 * 4. Update inode with final fattr data
+	 */
+
+	if (!*inode) {
+		*inode = cifs_iget(sb, &fattr);
+		if (!*inode)
+			rc = -ENOMEM;
+	} else {
+		/* we already have inode, update it */
+
+		/* if uniqueid is different, return error */
+		if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM &&
+		    CIFS_I(*inode)->uniqueid != fattr.cf_uniqueid)) {
+			CIFS_I(*inode)->time = 0; /* force reval */
+			rc = -ESTALE;
+			goto out;
+		}
+
+		/* if filetype is different, return error */
+		rc = cifs_fattr_to_inode(*inode, &fattr);
+	}
+out:
+	cifs_put_tlink(tlink);
+	cifs_free_open_info(&data);
+	kfree(fattr.cf_symlink_target);
+	return rc;
+}
+
+
+static const struct inode_operations cifs_ipc_inode_ops = {
+	.lookup = cifs_lookup,
+};
+
+static int
+cifs_find_inode(struct inode *inode, void *opaque)
+{
+	struct cifs_fattr *fattr = opaque;
+
+	/* don't match inode with different uniqueid */
+	if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
+		return 0;
+
+	/* use createtime like an i_generation field */
+	if (CIFS_I(inode)->createtime != fattr->cf_createtime)
+		return 0;
+
+	/* don't match inode of different type */
+	if (inode_wrong_type(inode, fattr->cf_mode))
+		return 0;
+
+	/* if it's not a directory or has no dentries, then flag it */
+	if (S_ISDIR(inode->i_mode) && !hlist_empty(&inode->i_dentry))
+		fattr->cf_flags |= CIFS_FATTR_INO_COLLISION;
+
+	return 1;
+}
+
+static int
+cifs_init_inode(struct inode *inode, void *opaque)
+{
+	struct cifs_fattr *fattr = opaque;
+
+	CIFS_I(inode)->uniqueid = fattr->cf_uniqueid;
+	CIFS_I(inode)->createtime = fattr->cf_createtime;
+	return 0;
+}
+
+/*
+ * walk dentry list for an inode and report whether it has aliases that
+ * are hashed. We use this to determine if a directory inode can actually
+ * be used.
+ */
+static bool
+inode_has_hashed_dentries(struct inode *inode)
+{
+	struct dentry *dentry;
+
+	spin_lock(&inode->i_lock);
+	hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) {
+		if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
+			spin_unlock(&inode->i_lock);
+			return true;
+		}
+	}
+	spin_unlock(&inode->i_lock);
+	return false;
+}
+
+/* Given fattrs, get a corresponding inode */
+struct inode *
+cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
+{
+	unsigned long hash;
+	struct inode *inode;
+
+retry_iget5_locked:
+	cifs_dbg(FYI, "looking for uniqueid=%llu\n", fattr->cf_uniqueid);
+
+	/* hash down to 32-bits on 32-bit arch */
+	hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
+
+	inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
+	if (inode) {
+		/* was there a potentially problematic inode collision? */
+		if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) {
+			fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION;
+
+			if (inode_has_hashed_dentries(inode)) {
+				cifs_autodisable_serverino(CIFS_SB(sb));
+				iput(inode);
+				fattr->cf_uniqueid = iunique(sb, ROOT_I);
+				goto retry_iget5_locked;
+			}
+		}
+
+		/* can't fail - see cifs_find_inode() */
+		cifs_fattr_to_inode(inode, fattr);
+		if (sb->s_flags & SB_NOATIME)
+			inode->i_flags |= S_NOATIME | S_NOCMTIME;
+		if (inode->i_state & I_NEW) {
+			inode->i_ino = hash;
+			cifs_fscache_get_inode_cookie(inode);
+			unlock_new_inode(inode);
+		}
+	}
+
+	return inode;
+}
+
+/* gets root inode */
+struct inode *cifs_root_iget(struct super_block *sb)
+{
+	unsigned int xid;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+	struct inode *inode = NULL;
+	long rc;
+	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
+	char *path = NULL;
+	int len;
+
+	if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
+	    && cifs_sb->prepath) {
+		len = strlen(cifs_sb->prepath);
+		path = kzalloc(len + 2 /* leading sep + null */, GFP_KERNEL);
+		if (path == NULL)
+			return ERR_PTR(-ENOMEM);
+		path[0] = '/';
+		memcpy(path+1, cifs_sb->prepath, len);
+	} else {
+		path = kstrdup("", GFP_KERNEL);
+		if (path == NULL)
+			return ERR_PTR(-ENOMEM);
+	}
+
+	xid = get_xid();
+	if (tcon->unix_ext) {
+		rc = cifs_get_inode_info_unix(&inode, path, sb, xid);
+		/* some servers mistakenly claim POSIX support */
+		if (rc != -EOPNOTSUPP)
+			goto iget_no_retry;
+		cifs_dbg(VFS, "server does not support POSIX extensions\n");
+		tcon->unix_ext = false;
+	}
+
+	convert_delimiter(path, CIFS_DIR_SEP(cifs_sb));
+	if (tcon->posix_extensions)
+		rc = smb311_posix_get_inode_info(&inode, path, sb, xid);
+	else
+		rc = cifs_get_inode_info(&inode, path, NULL, sb, xid, NULL);
+
+iget_no_retry:
+	if (!inode) {
+		inode = ERR_PTR(rc);
+		goto out;
+	}
+
+	if (rc && tcon->pipe) {
+		cifs_dbg(FYI, "ipc connection - fake read inode\n");
+		spin_lock(&inode->i_lock);
+		inode->i_mode |= S_IFDIR;
+		set_nlink(inode, 2);
+		inode->i_op = &cifs_ipc_inode_ops;
+		inode->i_fop = &simple_dir_operations;
+		inode->i_uid = cifs_sb->ctx->linux_uid;
+		inode->i_gid = cifs_sb->ctx->linux_gid;
+		spin_unlock(&inode->i_lock);
+	} else if (rc) {
+		iget_failed(inode);
+		inode = ERR_PTR(rc);
+	}
+
+out:
+	kfree(path);
+	free_xid(xid);
+	return inode;
+}
+
+int
+cifs_set_file_info(struct inode *inode, struct iattr *attrs, unsigned int xid,
+		   const char *full_path, __u32 dosattr)
+{
+	bool set_time = false;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+	struct TCP_Server_Info *server;
+	FILE_BASIC_INFO	info_buf;
+
+	if (attrs == NULL)
+		return -EINVAL;
+
+	server = cifs_sb_master_tcon(cifs_sb)->ses->server;
+	if (!server->ops->set_file_info)
+		return -ENOSYS;
+
+	info_buf.Pad = 0;
+
+	if (attrs->ia_valid & ATTR_ATIME) {
+		set_time = true;
+		info_buf.LastAccessTime =
+			cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
+	} else
+		info_buf.LastAccessTime = 0;
+
+	if (attrs->ia_valid & ATTR_MTIME) {
+		set_time = true;
+		info_buf.LastWriteTime =
+		    cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
+	} else
+		info_buf.LastWriteTime = 0;
+
+	/*
+	 * Samba throws this field away, but windows may actually use it.
+	 * Do not set ctime unless other time stamps are changed explicitly
+	 * (i.e. by utimes()) since we would then have a mix of client and
+	 * server times.
+	 */
+	if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
+		cifs_dbg(FYI, "CIFS - CTIME changed\n");
+		info_buf.ChangeTime =
+		    cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
+	} else
+		info_buf.ChangeTime = 0;
+
+	info_buf.CreationTime = 0;	/* don't change */
+	info_buf.Attributes = cpu_to_le32(dosattr);
+
+	return server->ops->set_file_info(inode, full_path, &info_buf, xid);
+}
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+/*
+ * Open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
+ * and rename it to a random name that hopefully won't conflict with
+ * anything else.
+ */
+int
+cifs_rename_pending_delete(const char *full_path, struct dentry *dentry,
+			   const unsigned int xid)
+{
+	int oplock = 0;
+	int rc;
+	struct cifs_fid fid;
+	struct cifs_open_parms oparms;
+	struct inode *inode = d_inode(dentry);
+	struct cifsInodeInfo *cifsInode = CIFS_I(inode);
+	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+	struct tcon_link *tlink;
+	struct cifs_tcon *tcon;
+	__u32 dosattr, origattr;
+	FILE_BASIC_INFO *info_buf = NULL;
+
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	tcon = tlink_tcon(tlink);
+
+	/*
+	 * We cannot rename the file if the server doesn't support
+	 * CAP_INFOLEVEL_PASSTHRU
+	 */
+	if (!(tcon->ses->capabilities & CAP_INFOLEVEL_PASSTHRU)) {
+		rc = -EBUSY;
+		goto out;
+	}
+
+	oparms = (struct cifs_open_parms) {
+		.tcon = tcon,
+		.cifs_sb = cifs_sb,
+		.desired_access = DELETE | FILE_WRITE_ATTRIBUTES,
+		.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR),
+		.disposition = FILE_OPEN,
+		.path = full_path,
+		.fid = &fid,
+	};
+
+	rc = CIFS_open(xid, &oparms, &oplock, NULL);
+	if (rc != 0)
+		goto out;
+
+	origattr = cifsInode->cifsAttrs;
+	if (origattr == 0)
+		origattr |= ATTR_NORMAL;
+
+	dosattr = origattr & ~ATTR_READONLY;
+	if (dosattr == 0)
+		dosattr |= ATTR_NORMAL;
+	dosattr |= ATTR_HIDDEN;
+
+	/* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
+	if (dosattr != origattr) {
+		info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
+		if (info_buf == NULL) {
+			rc = -ENOMEM;
+			goto out_close;
+		}
+		info_buf->Attributes = cpu_to_le32(dosattr);
+		rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid,
+					current->tgid);
+		/* although we would like to mark the file hidden
+ 		   if that fails we will still try to rename it */
+		if (!rc)
+			cifsInode->cifsAttrs = dosattr;
+		else
+			dosattr = origattr; /* since not able to change them */
+	}
+
+	/* rename the file */
+	rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, NULL,
+				   cifs_sb->local_nls,
+				   cifs_remap(cifs_sb));
+	if (rc != 0) {
+		rc = -EBUSY;
+		goto undo_setattr;
+	}
+
+	/* try to set DELETE_ON_CLOSE */
+	if (!test_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags)) {
+		rc = CIFSSMBSetFileDisposition(xid, tcon, true, fid.netfid,
+					       current->tgid);
+		/*
+		 * some samba versions return -ENOENT when we try to set the
+		 * file disposition here. Likely a samba bug, but work around
+		 * it for now. This means that some cifsXXX files may hang
+		 * around after they shouldn't.
+		 *
+		 * BB: remove this hack after more servers have the fix
+		 */
+		if (rc == -ENOENT)
+			rc = 0;
+		else if (rc != 0) {
+			rc = -EBUSY;
+			goto undo_rename;
+		}
+		set_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags);
+	}
+
+out_close:
+	CIFSSMBClose(xid, tcon, fid.netfid);
+out:
+	kfree(info_buf);
+	cifs_put_tlink(tlink);
+	return rc;
+
+	/*
+	 * reset everything back to the original state. Don't bother
+	 * dealing with errors here since we can't do anything about
+	 * them anyway.
+	 */
+undo_rename:
+	CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, dentry->d_name.name,
+				cifs_sb->local_nls, cifs_remap(cifs_sb));
+undo_setattr:
+	if (dosattr != origattr) {
+		info_buf->Attributes = cpu_to_le32(origattr);
+		if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid,
+					current->tgid))
+			cifsInode->cifsAttrs = origattr;
+	}
+
+	goto out_close;
+}
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+/* copied from fs/nfs/dir.c with small changes */
+static void
+cifs_drop_nlink(struct inode *inode)
+{
+	spin_lock(&inode->i_lock);
+	if (inode->i_nlink > 0)
+		drop_nlink(inode);
+	spin_unlock(&inode->i_lock);
+}
+
+/*
+ * If d_inode(dentry) is null (usually meaning the cached dentry
+ * is a negative dentry) then we would attempt a standard SMB delete, but
+ * if that fails we can not attempt the fall back mechanisms on EACCES
+ * but will return the EACCES to the caller. Note that the VFS does not call
+ * unlink on negative dentries currently.
+ */
+int cifs_unlink(struct inode *dir, struct dentry *dentry)
+{
+	int rc = 0;
+	unsigned int xid;
+	const char *full_path;
+	void *page;
+	struct inode *inode = d_inode(dentry);
+	struct cifsInodeInfo *cifs_inode;
+	struct super_block *sb = dir->i_sb;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+	struct tcon_link *tlink;
+	struct cifs_tcon *tcon;
+	struct TCP_Server_Info *server;
+	struct iattr *attrs = NULL;
+	__u32 dosattr = 0, origattr = 0;
+
+	cifs_dbg(FYI, "cifs_unlink, dir=0x%p, dentry=0x%p\n", dir, dentry);
+
+	if (unlikely(cifs_forced_shutdown(cifs_sb)))
+		return -EIO;
+
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	tcon = tlink_tcon(tlink);
+	server = tcon->ses->server;
+
+	xid = get_xid();
+	page = alloc_dentry_path();
+
+	if (tcon->nodelete) {
+		rc = -EACCES;
+		goto unlink_out;
+	}
+
+	/* Unlink can be called from rename so we can not take the
+	 * sb->s_vfs_rename_mutex here */
+	full_path = build_path_from_dentry(dentry, page);
+	if (IS_ERR(full_path)) {
+		rc = PTR_ERR(full_path);
+		goto unlink_out;
+	}
+
+	cifs_close_deferred_file_under_dentry(tcon, full_path);
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+	if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
+				le64_to_cpu(tcon->fsUnixInfo.Capability))) {
+		rc = CIFSPOSIXDelFile(xid, tcon, full_path,
+			SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
+			cifs_remap(cifs_sb));
+		cifs_dbg(FYI, "posix del rc %d\n", rc);
+		if ((rc == 0) || (rc == -ENOENT))
+			goto psx_del_no_retry;
+	}
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+retry_std_delete:
+	if (!server->ops->unlink) {
+		rc = -ENOSYS;
+		goto psx_del_no_retry;
+	}
+
+	rc = server->ops->unlink(xid, tcon, full_path, cifs_sb);
+
+psx_del_no_retry:
+	if (!rc) {
+		if (inode)
+			cifs_drop_nlink(inode);
+	} else if (rc == -ENOENT) {
+		d_drop(dentry);
+	} else if (rc == -EBUSY) {
+		if (server->ops->rename_pending_delete) {
+			rc = server->ops->rename_pending_delete(full_path,
+								dentry, xid);
+			if (rc == 0)
+				cifs_drop_nlink(inode);
+		}
+	} else if ((rc == -EACCES) && (dosattr == 0) && inode) {
+		attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
+		if (attrs == NULL) {
+			rc = -ENOMEM;
+			goto out_reval;
+		}
+
+		/* try to reset dos attributes */
+		cifs_inode = CIFS_I(inode);
+		origattr = cifs_inode->cifsAttrs;
+		if (origattr == 0)
+			origattr |= ATTR_NORMAL;
+		dosattr = origattr & ~ATTR_READONLY;
+		if (dosattr == 0)
+			dosattr |= ATTR_NORMAL;
+		dosattr |= ATTR_HIDDEN;
+
+		rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
+		if (rc != 0)
+			goto out_reval;
+
+		goto retry_std_delete;
+	}
+
+	/* undo the setattr if we errored out and it's needed */
+	if (rc != 0 && dosattr != 0)
+		cifs_set_file_info(inode, attrs, xid, full_path, origattr);
+
+out_reval:
+	if (inode) {
+		cifs_inode = CIFS_I(inode);
+		cifs_inode->time = 0;	/* will force revalidate to get info
+					   when needed */
+		inode->i_ctime = current_time(inode);
+	}
+	dir->i_ctime = dir->i_mtime = current_time(dir);
+	cifs_inode = CIFS_I(dir);
+	CIFS_I(dir)->time = 0;	/* force revalidate of dir as well */
+unlink_out:
+	free_dentry_path(page);
+	kfree(attrs);
+	free_xid(xid);
+	cifs_put_tlink(tlink);
+	return rc;
+}
+
+static int
+cifs_mkdir_qinfo(struct inode *parent, struct dentry *dentry, umode_t mode,
+		 const char *full_path, struct cifs_sb_info *cifs_sb,
+		 struct cifs_tcon *tcon, const unsigned int xid)
+{
+	int rc = 0;
+	struct inode *inode = NULL;
+
+	if (tcon->posix_extensions)
+		rc = smb311_posix_get_inode_info(&inode, full_path, parent->i_sb, xid);
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+	else if (tcon->unix_ext)
+		rc = cifs_get_inode_info_unix(&inode, full_path, parent->i_sb,
+					      xid);
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+	else
+		rc = cifs_get_inode_info(&inode, full_path, NULL, parent->i_sb,
+					 xid, NULL);
+
+	if (rc)
+		return rc;
+
+	if (!S_ISDIR(inode->i_mode)) {
+		/*
+		 * mkdir succeeded, but another client has managed to remove the
+		 * sucker and replace it with non-directory.  Return success,
+		 * but don't leave the child in dcache.
+		 */
+		 iput(inode);
+		 d_drop(dentry);
+		 return 0;
+	}
+	/*
+	 * setting nlink not necessary except in cases where we failed to get it
+	 * from the server or was set bogus. Also, since this is a brand new
+	 * inode, no need to grab the i_lock before setting the i_nlink.
+	 */
+	if (inode->i_nlink < 2)
+		set_nlink(inode, 2);
+	mode &= ~current_umask();
+	/* must turn on setgid bit if parent dir has it */
+	if (parent->i_mode & S_ISGID)
+		mode |= S_ISGID;
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+	if (tcon->unix_ext) {
+		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 (parent->i_mode & S_ISGID)
+				args.gid = parent->i_gid;
+			else
+				args.gid = current_fsgid();
+		} else {
+			args.uid = INVALID_UID; /* no change */
+			args.gid = INVALID_GID; /* no change */
+		}
+		CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
+				       cifs_sb->local_nls,
+				       cifs_remap(cifs_sb));
+	} else {
+#else
+	{
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+		struct TCP_Server_Info *server = tcon->ses->server;
+		if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
+		    (mode & S_IWUGO) == 0 && server->ops->mkdir_setinfo)
+			server->ops->mkdir_setinfo(inode, full_path, cifs_sb,
+						   tcon, xid);
+		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
+			inode->i_mode = (mode | S_IFDIR);
+
+		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
+			inode->i_uid = current_fsuid();
+			if (inode->i_mode & S_ISGID)
+				inode->i_gid = parent->i_gid;
+			else
+				inode->i_gid = current_fsgid();
+		}
+	}
+	d_instantiate(dentry, inode);
+	return 0;
+}
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+static int
+cifs_posix_mkdir(struct inode *inode, struct dentry *dentry, umode_t mode,
+		 const char *full_path, struct cifs_sb_info *cifs_sb,
+		 struct cifs_tcon *tcon, const unsigned int xid)
+{
+	int rc = 0;
+	u32 oplock = 0;
+	FILE_UNIX_BASIC_INFO *info = NULL;
+	struct inode *newinode = NULL;
+	struct cifs_fattr fattr;
+
+	info = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
+	if (info == NULL) {
+		rc = -ENOMEM;
+		goto posix_mkdir_out;
+	}
+
+	mode &= ~current_umask();
+	rc = CIFSPOSIXCreate(xid, tcon, SMB_O_DIRECTORY | SMB_O_CREAT, mode,
+			     NULL /* netfid */, info, &oplock, full_path,
+			     cifs_sb->local_nls, cifs_remap(cifs_sb));
+	if (rc == -EOPNOTSUPP)
+		goto posix_mkdir_out;
+	else if (rc) {
+		cifs_dbg(FYI, "posix mkdir returned 0x%x\n", rc);
+		d_drop(dentry);
+		goto posix_mkdir_out;
+	}
+
+	if (info->Type == cpu_to_le32(-1))
+		/* no return info, go query for it */
+		goto posix_mkdir_get_info;
+	/*
+	 * BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if
+	 * need to set uid/gid.
+	 */
+
+	cifs_unix_basic_to_fattr(&fattr, info, cifs_sb);
+	cifs_fill_uniqueid(inode->i_sb, &fattr);
+	newinode = cifs_iget(inode->i_sb, &fattr);
+	if (!newinode)
+		goto posix_mkdir_get_info;
+
+	d_instantiate(dentry, newinode);
+
+#ifdef CONFIG_CIFS_DEBUG2
+	cifs_dbg(FYI, "instantiated dentry %p %pd to inode %p\n",
+		 dentry, dentry, newinode);
+
+	if (newinode->i_nlink != 2)
+		cifs_dbg(FYI, "unexpected number of links %d\n",
+			 newinode->i_nlink);
+#endif
+
+posix_mkdir_out:
+	kfree(info);
+	return rc;
+posix_mkdir_get_info:
+	rc = cifs_mkdir_qinfo(inode, dentry, mode, full_path, cifs_sb, tcon,
+			      xid);
+	goto posix_mkdir_out;
+}
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+int cifs_mkdir(struct user_namespace *mnt_userns, struct inode *inode,
+	       struct dentry *direntry, umode_t mode)
+{
+	int rc = 0;
+	unsigned int xid;
+	struct cifs_sb_info *cifs_sb;
+	struct tcon_link *tlink;
+	struct cifs_tcon *tcon;
+	struct TCP_Server_Info *server;
+	const char *full_path;
+	void *page;
+
+	cifs_dbg(FYI, "In cifs_mkdir, mode = %04ho inode = 0x%p\n",
+		 mode, inode);
+
+	cifs_sb = CIFS_SB(inode->i_sb);
+	if (unlikely(cifs_forced_shutdown(cifs_sb)))
+		return -EIO;
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	tcon = tlink_tcon(tlink);
+
+	xid = get_xid();
+
+	page = alloc_dentry_path();
+	full_path = build_path_from_dentry(direntry, page);
+	if (IS_ERR(full_path)) {
+		rc = PTR_ERR(full_path);
+		goto mkdir_out;
+	}
+
+	server = tcon->ses->server;
+
+	if ((server->ops->posix_mkdir) && (tcon->posix_extensions)) {
+		rc = server->ops->posix_mkdir(xid, inode, mode, tcon, full_path,
+					      cifs_sb);
+		d_drop(direntry); /* for time being always refresh inode info */
+		goto mkdir_out;
+	}
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+	if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
+				le64_to_cpu(tcon->fsUnixInfo.Capability))) {
+		rc = cifs_posix_mkdir(inode, direntry, mode, full_path, cifs_sb,
+				      tcon, xid);
+		if (rc != -EOPNOTSUPP)
+			goto mkdir_out;
+	}
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+	if (!server->ops->mkdir) {
+		rc = -ENOSYS;
+		goto mkdir_out;
+	}
+
+	/* BB add setting the equivalent of mode via CreateX w/ACLs */
+	rc = server->ops->mkdir(xid, inode, mode, tcon, full_path, cifs_sb);
+	if (rc) {
+		cifs_dbg(FYI, "cifs_mkdir returned 0x%x\n", rc);
+		d_drop(direntry);
+		goto mkdir_out;
+	}
+
+	/* TODO: skip this for smb2/smb3 */
+	rc = cifs_mkdir_qinfo(inode, direntry, mode, full_path, cifs_sb, tcon,
+			      xid);
+mkdir_out:
+	/*
+	 * Force revalidate to get parent dir info when needed since cached
+	 * attributes are invalid now.
+	 */
+	CIFS_I(inode)->time = 0;
+	free_dentry_path(page);
+	free_xid(xid);
+	cifs_put_tlink(tlink);
+	return rc;
+}
+
+int cifs_rmdir(struct inode *inode, struct dentry *direntry)
+{
+	int rc = 0;
+	unsigned int xid;
+	struct cifs_sb_info *cifs_sb;
+	struct tcon_link *tlink;
+	struct cifs_tcon *tcon;
+	struct TCP_Server_Info *server;
+	const char *full_path;
+	void *page = alloc_dentry_path();
+	struct cifsInodeInfo *cifsInode;
+
+	cifs_dbg(FYI, "cifs_rmdir, inode = 0x%p\n", inode);
+
+	xid = get_xid();
+
+	full_path = build_path_from_dentry(direntry, page);
+	if (IS_ERR(full_path)) {
+		rc = PTR_ERR(full_path);
+		goto rmdir_exit;
+	}
+
+	cifs_sb = CIFS_SB(inode->i_sb);
+	if (unlikely(cifs_forced_shutdown(cifs_sb))) {
+		rc = -EIO;
+		goto rmdir_exit;
+	}
+
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink)) {
+		rc = PTR_ERR(tlink);
+		goto rmdir_exit;
+	}
+	tcon = tlink_tcon(tlink);
+	server = tcon->ses->server;
+
+	if (!server->ops->rmdir) {
+		rc = -ENOSYS;
+		cifs_put_tlink(tlink);
+		goto rmdir_exit;
+	}
+
+	if (tcon->nodelete) {
+		rc = -EACCES;
+		cifs_put_tlink(tlink);
+		goto rmdir_exit;
+	}
+
+	rc = server->ops->rmdir(xid, tcon, full_path, cifs_sb);
+	cifs_put_tlink(tlink);
+
+	if (!rc) {
+		spin_lock(&d_inode(direntry)->i_lock);
+		i_size_write(d_inode(direntry), 0);
+		clear_nlink(d_inode(direntry));
+		spin_unlock(&d_inode(direntry)->i_lock);
+	}
+
+	cifsInode = CIFS_I(d_inode(direntry));
+	/* force revalidate to go get info when needed */
+	cifsInode->time = 0;
+
+	cifsInode = CIFS_I(inode);
+	/*
+	 * Force revalidate to get parent dir info when needed since cached
+	 * attributes are invalid now.
+	 */
+	cifsInode->time = 0;
+
+	d_inode(direntry)->i_ctime = inode->i_ctime = inode->i_mtime =
+		current_time(inode);
+
+rmdir_exit:
+	free_dentry_path(page);
+	free_xid(xid);
+	return rc;
+}
+
+static int
+cifs_do_rename(const unsigned int xid, struct dentry *from_dentry,
+	       const char *from_path, struct dentry *to_dentry,
+	       const char *to_path)
+{
+	struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
+	struct tcon_link *tlink;
+	struct cifs_tcon *tcon;
+	struct TCP_Server_Info *server;
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+	struct cifs_fid fid;
+	struct cifs_open_parms oparms;
+	int oplock;
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+	int rc;
+
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	tcon = tlink_tcon(tlink);
+	server = tcon->ses->server;
+
+	if (!server->ops->rename)
+		return -ENOSYS;
+
+	/* try path-based rename first */
+	rc = server->ops->rename(xid, tcon, from_path, to_path, cifs_sb);
+
+	/*
+	 * Don't bother with rename by filehandle unless file is busy and
+	 * source. Note that cross directory moves do not work with
+	 * rename by filehandle to various Windows servers.
+	 */
+	if (rc == 0 || rc != -EBUSY)
+		goto do_rename_exit;
+
+	/* Don't fall back to using SMB on SMB 2+ mount */
+	if (server->vals->protocol_id != 0)
+		goto do_rename_exit;
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+	/* open-file renames don't work across directories */
+	if (to_dentry->d_parent != from_dentry->d_parent)
+		goto do_rename_exit;
+
+	oparms = (struct cifs_open_parms) {
+		.tcon = tcon,
+		.cifs_sb = cifs_sb,
+		/* open the file to be renamed -- we need DELETE perms */
+		.desired_access = DELETE,
+		.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR),
+		.disposition = FILE_OPEN,
+		.path = from_path,
+		.fid = &fid,
+	};
+
+	rc = CIFS_open(xid, &oparms, &oplock, NULL);
+	if (rc == 0) {
+		rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid,
+				(const char *) to_dentry->d_name.name,
+				cifs_sb->local_nls, cifs_remap(cifs_sb));
+		CIFSSMBClose(xid, tcon, fid.netfid);
+	}
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+do_rename_exit:
+	if (rc == 0)
+		d_move(from_dentry, to_dentry);
+	cifs_put_tlink(tlink);
+	return rc;
+}
+
+int
+cifs_rename2(struct user_namespace *mnt_userns, struct inode *source_dir,
+	     struct dentry *source_dentry, struct inode *target_dir,
+	     struct dentry *target_dentry, unsigned int flags)
+{
+	const char *from_name, *to_name;
+	void *page1, *page2;
+	struct cifs_sb_info *cifs_sb;
+	struct tcon_link *tlink;
+	struct cifs_tcon *tcon;
+	unsigned int xid;
+	int rc, tmprc;
+	int retry_count = 0;
+	FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+	FILE_UNIX_BASIC_INFO *info_buf_target;
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+	if (flags & ~RENAME_NOREPLACE)
+		return -EINVAL;
+
+	cifs_sb = CIFS_SB(source_dir->i_sb);
+	if (unlikely(cifs_forced_shutdown(cifs_sb)))
+		return -EIO;
+
+	tlink = cifs_sb_tlink(cifs_sb);
+	if (IS_ERR(tlink))
+		return PTR_ERR(tlink);
+	tcon = tlink_tcon(tlink);
+
+	page1 = alloc_dentry_path();
+	page2 = alloc_dentry_path();
+	xid = get_xid();
+
+	from_name = build_path_from_dentry(source_dentry, page1);
+	if (IS_ERR(from_name)) {
+		rc = PTR_ERR(from_name);
+		goto cifs_rename_exit;
+	}
+
+	to_name = build_path_from_dentry(target_dentry, page2);
+	if (IS_ERR(to_name)) {
+		rc = PTR_ERR(to_name);
+		goto cifs_rename_exit;
+	}
+
+	cifs_close_deferred_file_under_dentry(tcon, from_name);
+	if (d_inode(target_dentry) != NULL)
+		cifs_close_deferred_file_under_dentry(tcon, to_name);
+
+	rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry,
+			    to_name);
+
+	if (rc == -EACCES) {
+		while (retry_count < 3) {
+			cifs_close_all_deferred_files(tcon);
+			rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry,
+					    to_name);
+			if (rc != -EACCES)
+				break;
+			retry_count++;
+		}
+	}
+
+	/*
+	 * No-replace is the natural behavior for CIFS, so skip unlink hacks.
+	 */
+	if (flags & RENAME_NOREPLACE)
+		goto cifs_rename_exit;
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+	if (rc == -EEXIST && tcon->unix_ext) {
+		/*
+		 * Are src and dst hardlinks of same inode? We can only tell
+		 * with unix extensions enabled.
+		 */
+		info_buf_source =
+			kmalloc_array(2, sizeof(FILE_UNIX_BASIC_INFO),
+					GFP_KERNEL);
+		if (info_buf_source == NULL) {
+			rc = -ENOMEM;
+			goto cifs_rename_exit;
+		}
+
+		info_buf_target = info_buf_source + 1;
+		tmprc = CIFSSMBUnixQPathInfo(xid, tcon, from_name,
+					     info_buf_source,
+					     cifs_sb->local_nls,
+					     cifs_remap(cifs_sb));
+		if (tmprc != 0)
+			goto unlink_target;
+
+		tmprc = CIFSSMBUnixQPathInfo(xid, tcon, to_name,
+					     info_buf_target,
+					     cifs_sb->local_nls,
+					     cifs_remap(cifs_sb));
+
+		if (tmprc == 0 && (info_buf_source->UniqueId ==
+				   info_buf_target->UniqueId)) {
+			/* same file, POSIX says that this is a noop */
+			rc = 0;
+			goto cifs_rename_exit;
+		}
+	}
+	/*
+	 * else ... BB we could add the same check for Windows by
+	 * checking the UniqueId via FILE_INTERNAL_INFO
+	 */
+
+unlink_target:
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+	/* Try unlinking the target dentry if it's not negative */
+	if (d_really_is_positive(target_dentry) && (rc == -EACCES || rc == -EEXIST)) {
+		if (d_is_dir(target_dentry))
+			tmprc = cifs_rmdir(target_dir, target_dentry);
+		else
+			tmprc = cifs_unlink(target_dir, target_dentry);
+		if (tmprc)
+			goto cifs_rename_exit;
+		rc = cifs_do_rename(xid, source_dentry, from_name,
+				    target_dentry, to_name);
+	}
+
+	/* force revalidate to go get info when needed */
+	CIFS_I(source_dir)->time = CIFS_I(target_dir)->time = 0;
+
+	source_dir->i_ctime = source_dir->i_mtime = target_dir->i_ctime =
+		target_dir->i_mtime = current_time(source_dir);
+
+cifs_rename_exit:
+	kfree(info_buf_source);
+	free_dentry_path(page2);
+	free_dentry_path(page1);
+	free_xid(xid);
+	cifs_put_tlink(tlink);
+	return rc;
+}
+
+static bool
+cifs_dentry_needs_reval(struct dentry *dentry)
+{
+	struct inode *inode = d_inode(dentry);
+	struct cifsInodeInfo *cifs_i = CIFS_I(inode);
+	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
+	struct cached_fid *cfid = NULL;
+
+	if (cifs_i->time == 0)
+		return true;
+
+	if (CIFS_CACHE_READ(cifs_i))
+		return false;
+
+	if (!lookupCacheEnabled)
+		return true;
+
+	if (!open_cached_dir_by_dentry(tcon, dentry->d_parent, &cfid)) {
+		spin_lock(&cfid->fid_lock);
+		if (cfid->time && cifs_i->time > cfid->time) {
+			spin_unlock(&cfid->fid_lock);
+			close_cached_dir(cfid);
+			return false;
+		}
+		spin_unlock(&cfid->fid_lock);
+		close_cached_dir(cfid);
+	}
+	/*
+	 * depending on inode type, check if attribute caching disabled for
+	 * files or directories
+	 */
+	if (S_ISDIR(inode->i_mode)) {
+		if (!cifs_sb->ctx->acdirmax)
+			return true;
+		if (!time_in_range(jiffies, cifs_i->time,
+				   cifs_i->time + cifs_sb->ctx->acdirmax))
+			return true;
+	} else { /* file */
+		if (!cifs_sb->ctx->acregmax)
+			return true;
+		if (!time_in_range(jiffies, cifs_i->time,
+				   cifs_i->time + cifs_sb->ctx->acregmax))
+			return true;
+	}
+
+	/* hardlinked files w/ noserverino get "special" treatment */
+	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
+	    S_ISREG(inode->i_mode) && inode->i_nlink != 1)
+		return true;
+
+	return false;
+}
+
+/*
+ * Zap the cache. Called when invalid_mapping flag is set.
+ */
+int
+cifs_invalidate_mapping(struct inode *inode)
+{
+	int rc = 0;
+
+	if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
+		rc = invalidate_inode_pages2(inode->i_mapping);
+		if (rc)
+			cifs_dbg(VFS, "%s: Could not invalidate inode %p\n",
+				 __func__, inode);
+	}
+
+	return rc;
+}
+
+/**
+ * cifs_wait_bit_killable - helper for functions that are sleeping on bit locks
+ *
+ * @key:	currently unused
+ * @mode:	the task state to sleep in
+ */
+static int
+cifs_wait_bit_killable(struct wait_bit_key *key, int mode)
+{
+	schedule();
+	if (signal_pending_state(mode, current))
+		return -ERESTARTSYS;
+	return 0;
+}
+
+int
+cifs_revalidate_mapping(struct inode *inode)
+{
+	int rc;
+	unsigned long *flags = &CIFS_I(inode)->flags;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+
+	/* swapfiles are not supposed to be shared */
+	if (IS_SWAPFILE(inode))
+		return 0;
+
+	rc = wait_on_bit_lock_action(flags, CIFS_INO_LOCK, cifs_wait_bit_killable,
+				     TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
+	if (rc)
+		return rc;
+
+	if (test_and_clear_bit(CIFS_INO_INVALID_MAPPING, flags)) {
+		/* for cache=singleclient, do not invalidate */
+		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
+			goto skip_invalidate;
+
+		rc = cifs_invalidate_mapping(inode);
+		if (rc)
+			set_bit(CIFS_INO_INVALID_MAPPING, flags);
+	}
+
+skip_invalidate:
+	clear_bit_unlock(CIFS_INO_LOCK, flags);
+	smp_mb__after_atomic();
+	wake_up_bit(flags, CIFS_INO_LOCK);
+
+	return rc;
+}
+
+int
+cifs_zap_mapping(struct inode *inode)
+{
+	set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(inode)->flags);
+	return cifs_revalidate_mapping(inode);
+}
+
+int cifs_revalidate_file_attr(struct file *filp)
+{
+	int rc = 0;
+	struct dentry *dentry = file_dentry(filp);
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+	struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+	if (!cifs_dentry_needs_reval(dentry))
+		return rc;
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+	if (tlink_tcon(cfile->tlink)->unix_ext)
+		rc = cifs_get_file_info_unix(filp);
+	else
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+		rc = cifs_get_file_info(filp);
+
+	return rc;
+}
+
+int cifs_revalidate_dentry_attr(struct dentry *dentry)
+{
+	unsigned int xid;
+	int rc = 0;
+	struct inode *inode = d_inode(dentry);
+	struct super_block *sb = dentry->d_sb;
+	const char *full_path;
+	void *page;
+	int count = 0;
+
+	if (inode == NULL)
+		return -ENOENT;
+
+	if (!cifs_dentry_needs_reval(dentry))
+		return rc;
+
+	xid = get_xid();
+
+	page = alloc_dentry_path();
+	full_path = build_path_from_dentry(dentry, page);
+	if (IS_ERR(full_path)) {
+		rc = PTR_ERR(full_path);
+		goto out;
+	}
+
+	cifs_dbg(FYI, "Update attributes: %s inode 0x%p count %d dentry: 0x%p d_time %ld jiffies %ld\n",
+		 full_path, inode, inode->i_count.counter,
+		 dentry, cifs_get_time(dentry), jiffies);
+
+again:
+	if (cifs_sb_master_tcon(CIFS_SB(sb))->posix_extensions)
+		rc = smb311_posix_get_inode_info(&inode, full_path, sb, xid);
+	else if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
+		rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
+	else
+		rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
+					 xid, NULL);
+	if (rc == -EAGAIN && count++ < 10)
+		goto again;
+out:
+	free_dentry_path(page);
+	free_xid(xid);
+
+	return rc;
+}
+
+int cifs_revalidate_file(struct file *filp)
+{
+	int rc;
+	struct inode *inode = file_inode(filp);
+
+	rc = cifs_revalidate_file_attr(filp);
+	if (rc)
+		return rc;
+
+	return cifs_revalidate_mapping(inode);
+}
+
+/* revalidate a dentry's inode attributes */
+int cifs_revalidate_dentry(struct dentry *dentry)
+{
+	int rc;
+	struct inode *inode = d_inode(dentry);
+
+	rc = cifs_revalidate_dentry_attr(dentry);
+	if (rc)
+		return rc;
+
+	return cifs_revalidate_mapping(inode);
+}
+
+int cifs_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		 struct kstat *stat, u32 request_mask, unsigned int flags)
+{
+	struct dentry *dentry = path->dentry;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
+	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
+	struct inode *inode = d_inode(dentry);
+	int rc;
+
+	if (unlikely(cifs_forced_shutdown(CIFS_SB(inode->i_sb))))
+		return -EIO;
+
+	/*
+	 * We need to be sure that all dirty pages are written and the server
+	 * has actual ctime, mtime and file length.
+	 */
+	if ((request_mask & (STATX_CTIME | STATX_MTIME | STATX_SIZE | STATX_BLOCKS)) &&
+	    !CIFS_CACHE_READ(CIFS_I(inode)) &&
+	    inode->i_mapping && inode->i_mapping->nrpages != 0) {
+		rc = filemap_fdatawait(inode->i_mapping);
+		if (rc) {
+			mapping_set_error(inode->i_mapping, rc);
+			return rc;
+		}
+	}
+
+	if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_FORCE_SYNC)
+		CIFS_I(inode)->time = 0; /* force revalidate */
+
+	/*
+	 * If the caller doesn't require syncing, only sync if
+	 * necessary (e.g. due to earlier truncate or setattr
+	 * invalidating the cached metadata)
+	 */
+	if (((flags & AT_STATX_SYNC_TYPE) != AT_STATX_DONT_SYNC) ||
+	    (CIFS_I(inode)->time == 0)) {
+		rc = cifs_revalidate_dentry_attr(dentry);
+		if (rc)
+			return rc;
+	}
+
+	generic_fillattr(&init_user_ns, inode, stat);
+	stat->blksize = cifs_sb->ctx->bsize;
+	stat->ino = CIFS_I(inode)->uniqueid;
+
+	/* old CIFS Unix Extensions doesn't return create time */
+	if (CIFS_I(inode)->createtime) {
+		stat->result_mask |= STATX_BTIME;
+		stat->btime =
+		      cifs_NTtimeToUnix(cpu_to_le64(CIFS_I(inode)->createtime));
+	}
+
+	stat->attributes_mask |= (STATX_ATTR_COMPRESSED | STATX_ATTR_ENCRYPTED);
+	if (CIFS_I(inode)->cifsAttrs & FILE_ATTRIBUTE_COMPRESSED)
+		stat->attributes |= STATX_ATTR_COMPRESSED;
+	if (CIFS_I(inode)->cifsAttrs & FILE_ATTRIBUTE_ENCRYPTED)
+		stat->attributes |= STATX_ATTR_ENCRYPTED;
+
+	/*
+	 * If on a multiuser mount without unix extensions or cifsacl being
+	 * enabled, and the admin hasn't overridden them, set the ownership
+	 * to the fsuid/fsgid of the current process.
+	 */
+	if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
+	    !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
+	    !tcon->unix_ext) {
+		if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
+			stat->uid = current_fsuid();
+		if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
+			stat->gid = current_fsgid();
+	}
+	return 0;
+}
+
+int cifs_fiemap(struct inode *inode, struct fiemap_extent_info *fei, u64 start,
+		u64 len)
+{
+	struct cifsInodeInfo *cifs_i = CIFS_I(inode);
+	struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_i->netfs.inode.i_sb);
+	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
+	struct TCP_Server_Info *server = tcon->ses->server;
+	struct cifsFileInfo *cfile;
+	int rc;
+
+	if (unlikely(cifs_forced_shutdown(cifs_sb)))
+		return -EIO;
+
+	/*
+	 * We need to be sure that all dirty pages are written as they
+	 * might fill holes on the server.
+	 */
+	if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
+	    inode->i_mapping->nrpages != 0) {
+		rc = filemap_fdatawait(inode->i_mapping);
+		if (rc) {
+			mapping_set_error(inode->i_mapping, rc);
+			return rc;
+		}
+	}
+
+	cfile = find_readable_file(cifs_i, false);
+	if (cfile == NULL)
+		return -EINVAL;
+
+	if (server->ops->fiemap) {
+		rc = server->ops->fiemap(tcon, cfile, fei, start, len);
+		cifsFileInfo_put(cfile);
+		return rc;
+	}
+
+	cifsFileInfo_put(cfile);
+	return -EOPNOTSUPP;
+}
+
+int cifs_truncate_page(struct address_space *mapping, loff_t from)
+{
+	pgoff_t index = from >> PAGE_SHIFT;
+	unsigned offset = from & (PAGE_SIZE - 1);
+	struct page *page;
+	int rc = 0;
+
+	page = grab_cache_page(mapping, index);
+	if (!page)
+		return -ENOMEM;
+
+	zero_user_segment(page, offset, PAGE_SIZE);
+	unlock_page(page);
+	put_page(page);
+	return rc;
+}
+
+void cifs_setsize(struct inode *inode, loff_t offset)
+{
+	struct cifsInodeInfo *cifs_i = CIFS_I(inode);
+
+	spin_lock(&inode->i_lock);
+	i_size_write(inode, offset);
+	spin_unlock(&inode->i_lock);
+
+	/* Cached inode must be refreshed on truncate */
+	cifs_i->time = 0;
+	truncate_pagecache(inode, offset);
+}
+
+static int
+cifs_set_file_size(struct inode *inode, struct iattr *attrs,
+		   unsigned int xid, const char *full_path)
+{
+	int rc;
+	struct cifsFileInfo *open_file;
+	struct cifsInodeInfo *cifsInode = CIFS_I(inode);
+	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+	struct tcon_link *tlink = NULL;
+	struct cifs_tcon *tcon = NULL;
+	struct TCP_Server_Info *server;
+
+	/*
+	 * To avoid spurious oplock breaks from server, in the case of
+	 * inodes that we already have open, avoid doing path based
+	 * setting of file size if we can do it by handle.
+	 * This keeps our caching token (oplock) and avoids timeouts
+	 * when the local oplock break takes longer to flush
+	 * writebehind data than the SMB timeout for the SetPathInfo
+	 * request would allow
+	 */
+	open_file = find_writable_file(cifsInode, FIND_WR_FSUID_ONLY);
+	if (open_file) {
+		tcon = tlink_tcon(open_file->tlink);
+		server = tcon->ses->server;
+		if (server->ops->set_file_size)
+			rc = server->ops->set_file_size(xid, tcon, open_file,
+							attrs->ia_size, false);
+		else
+			rc = -ENOSYS;
+		cifsFileInfo_put(open_file);
+		cifs_dbg(FYI, "SetFSize for attrs rc = %d\n", rc);
+	} else
+		rc = -EINVAL;
+
+	if (!rc)
+		goto set_size_out;
+
+	if (tcon == NULL) {
+		tlink = cifs_sb_tlink(cifs_sb);
+		if (IS_ERR(tlink))
+			return PTR_ERR(tlink);
+		tcon = tlink_tcon(tlink);
+		server = tcon->ses->server;
+	}
+
+	/*
+	 * Set file size by pathname rather than by handle either because no
+	 * valid, writeable file handle for it was found or because there was
+	 * an error setting it by handle.
+	 */
+	if (server->ops->set_path_size)
+		rc = server->ops->set_path_size(xid, tcon, full_path,
+						attrs->ia_size, cifs_sb, false);
+	else
+		rc = -ENOSYS;
+	cifs_dbg(FYI, "SetEOF by path (setattrs) rc = %d\n", rc);
+
+	if (tlink)
+		cifs_put_tlink(tlink);
+
+set_size_out:
+	if (rc == 0) {
+		cifsInode->server_eof = attrs->ia_size;
+		cifs_setsize(inode, attrs->ia_size);
+		/*
+		 * i_blocks is not related to (i_size / i_blksize), but instead
+		 * 512 byte (2**9) size is required for calculating num blocks.
+		 * Until we can query the server for actual allocation size,
+		 * this is best estimate we have for blocks allocated for a file
+		 * Number of blocks must be rounded up so size 1 is not 0 blocks
+		 */
+		inode->i_blocks = (512 - 1 + attrs->ia_size) >> 9;
+
+		/*
+		 * The man page of truncate says if the size changed,
+		 * then the st_ctime and st_mtime fields for the file
+		 * are updated.
+		 */
+		attrs->ia_ctime = attrs->ia_mtime = current_time(inode);
+		attrs->ia_valid |= ATTR_CTIME | ATTR_MTIME;
+
+		cifs_truncate_page(inode->i_mapping, inode->i_size);
+	}
+
+	return rc;
+}
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+static int
+cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
+{
+	int rc;
+	unsigned int xid;
+	const char *full_path;
+	void *page = alloc_dentry_path();
+	struct inode *inode = d_inode(direntry);
+	struct cifsInodeInfo *cifsInode = CIFS_I(inode);
+	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+	struct tcon_link *tlink;
+	struct cifs_tcon *pTcon;
+	struct cifs_unix_set_info_args *args = NULL;
+	struct cifsFileInfo *open_file;
+
+	cifs_dbg(FYI, "setattr_unix on file %pd attrs->ia_valid=0x%x\n",
+		 direntry, attrs->ia_valid);
+
+	xid = get_xid();
+
+	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
+		attrs->ia_valid |= ATTR_FORCE;
+
+	rc = setattr_prepare(&init_user_ns, direntry, attrs);
+	if (rc < 0)
+		goto out;
+
+	full_path = build_path_from_dentry(direntry, page);
+	if (IS_ERR(full_path)) {
+		rc = PTR_ERR(full_path);
+		goto out;
+	}
+
+	/*
+	 * Attempt to flush data before changing attributes. We need to do
+	 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
+	 * ownership or mode then we may also need to do this. Here, we take
+	 * the safe way out and just do the flush on all setattr requests. If
+	 * the flush returns error, store it to report later and continue.
+	 *
+	 * BB: This should be smarter. Why bother flushing pages that
+	 * will be truncated anyway? Also, should we error out here if
+	 * the flush returns error?
+	 */
+	rc = filemap_write_and_wait(inode->i_mapping);
+	if (is_interrupt_error(rc)) {
+		rc = -ERESTARTSYS;
+		goto out;
+	}
+
+	mapping_set_error(inode->i_mapping, rc);
+	rc = 0;
+
+	if (attrs->ia_valid & ATTR_SIZE) {
+		rc = cifs_set_file_size(inode, attrs, xid, full_path);
+		if (rc != 0)
+			goto out;
+	}
+
+	/* skip mode change if it's just for clearing setuid/setgid */
+	if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
+		attrs->ia_valid &= ~ATTR_MODE;
+
+	args = kmalloc(sizeof(*args), GFP_KERNEL);
+	if (args == NULL) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	/* set up the struct */
+	if (attrs->ia_valid & ATTR_MODE)
+		args->mode = attrs->ia_mode;
+	else
+		args->mode = NO_CHANGE_64;
+
+	if (attrs->ia_valid & ATTR_UID)
+		args->uid = attrs->ia_uid;
+	else
+		args->uid = INVALID_UID; /* no change */
+
+	if (attrs->ia_valid & ATTR_GID)
+		args->gid = attrs->ia_gid;
+	else
+		args->gid = INVALID_GID; /* no change */
+
+	if (attrs->ia_valid & ATTR_ATIME)
+		args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
+	else
+		args->atime = NO_CHANGE_64;
+
+	if (attrs->ia_valid & ATTR_MTIME)
+		args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
+	else
+		args->mtime = NO_CHANGE_64;
+
+	if (attrs->ia_valid & ATTR_CTIME)
+		args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
+	else
+		args->ctime = NO_CHANGE_64;
+
+	args->device = 0;
+	open_file = find_writable_file(cifsInode, FIND_WR_FSUID_ONLY);
+	if (open_file) {
+		u16 nfid = open_file->fid.netfid;
+		u32 npid = open_file->pid;
+		pTcon = tlink_tcon(open_file->tlink);
+		rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
+		cifsFileInfo_put(open_file);
+	} else {
+		tlink = cifs_sb_tlink(cifs_sb);
+		if (IS_ERR(tlink)) {
+			rc = PTR_ERR(tlink);
+			goto out;
+		}
+		pTcon = tlink_tcon(tlink);
+		rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
+				    cifs_sb->local_nls,
+				    cifs_remap(cifs_sb));
+		cifs_put_tlink(tlink);
+	}
+
+	if (rc)
+		goto out;
+
+	if ((attrs->ia_valid & ATTR_SIZE) &&
+	    attrs->ia_size != i_size_read(inode)) {
+		truncate_setsize(inode, attrs->ia_size);
+		fscache_resize_cookie(cifs_inode_cookie(inode), attrs->ia_size);
+	}
+
+	setattr_copy(&init_user_ns, inode, attrs);
+	mark_inode_dirty(inode);
+
+	/* force revalidate when any of these times are set since some
+	   of the fs types (eg ext3, fat) do not have fine enough
+	   time granularity to match protocol, and we do not have a
+	   a way (yet) to query the server fs's time granularity (and
+	   whether it rounds times down).
+	*/
+	if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
+		cifsInode->time = 0;
+out:
+	kfree(args);
+	free_dentry_path(page);
+	free_xid(xid);
+	return rc;
+}
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+static int
+cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
+{
+	unsigned int xid;
+	kuid_t uid = INVALID_UID;
+	kgid_t gid = INVALID_GID;
+	struct inode *inode = d_inode(direntry);
+	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+	struct cifsInodeInfo *cifsInode = CIFS_I(inode);
+	struct cifsFileInfo *wfile;
+	struct cifs_tcon *tcon;
+	const char *full_path;
+	void *page = alloc_dentry_path();
+	int rc = -EACCES;
+	__u32 dosattr = 0;
+	__u64 mode = NO_CHANGE_64;
+
+	xid = get_xid();
+
+	cifs_dbg(FYI, "setattr on file %pd attrs->ia_valid 0x%x\n",
+		 direntry, attrs->ia_valid);
+
+	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
+		attrs->ia_valid |= ATTR_FORCE;
+
+	rc = setattr_prepare(&init_user_ns, direntry, attrs);
+	if (rc < 0)
+		goto cifs_setattr_exit;
+
+	full_path = build_path_from_dentry(direntry, page);
+	if (IS_ERR(full_path)) {
+		rc = PTR_ERR(full_path);
+		goto cifs_setattr_exit;
+	}
+
+	/*
+	 * Attempt to flush data before changing attributes. We need to do
+	 * this for ATTR_SIZE and ATTR_MTIME.  If the flush of the data
+	 * returns error, store it to report later and continue.
+	 *
+	 * BB: This should be smarter. Why bother flushing pages that
+	 * will be truncated anyway? Also, should we error out here if
+	 * the flush returns error? Do we need to check for ATTR_MTIME_SET flag?
+	 */
+	if (attrs->ia_valid & (ATTR_MTIME | ATTR_SIZE | ATTR_CTIME)) {
+		rc = filemap_write_and_wait(inode->i_mapping);
+		if (is_interrupt_error(rc)) {
+			rc = -ERESTARTSYS;
+			goto cifs_setattr_exit;
+		}
+		mapping_set_error(inode->i_mapping, rc);
+	}
+
+	rc = 0;
+
+	if ((attrs->ia_valid & ATTR_MTIME) &&
+	    !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) {
+		rc = cifs_get_writable_file(cifsInode, FIND_WR_ANY, &wfile);
+		if (!rc) {
+			tcon = tlink_tcon(wfile->tlink);
+			rc = tcon->ses->server->ops->flush(xid, tcon, &wfile->fid);
+			cifsFileInfo_put(wfile);
+			if (rc)
+				goto cifs_setattr_exit;
+		} else if (rc != -EBADF)
+			goto cifs_setattr_exit;
+		else
+			rc = 0;
+	}
+
+	if (attrs->ia_valid & ATTR_SIZE) {
+		rc = cifs_set_file_size(inode, attrs, xid, full_path);
+		if (rc != 0)
+			goto cifs_setattr_exit;
+	}
+
+	if (attrs->ia_valid & ATTR_UID)
+		uid = attrs->ia_uid;
+
+	if (attrs->ia_valid & ATTR_GID)
+		gid = attrs->ia_gid;
+
+	if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) ||
+	    (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)) {
+		if (uid_valid(uid) || gid_valid(gid)) {
+			mode = NO_CHANGE_64;
+			rc = id_mode_to_cifs_acl(inode, full_path, &mode,
+							uid, gid);
+			if (rc) {
+				cifs_dbg(FYI, "%s: Setting id failed with error: %d\n",
+					 __func__, rc);
+				goto cifs_setattr_exit;
+			}
+		}
+	} else
+	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
+		attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
+
+	/* skip mode change if it's just for clearing setuid/setgid */
+	if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
+		attrs->ia_valid &= ~ATTR_MODE;
+
+	if (attrs->ia_valid & ATTR_MODE) {
+		mode = attrs->ia_mode;
+		rc = 0;
+		if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) ||
+		    (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)) {
+			rc = id_mode_to_cifs_acl(inode, full_path, &mode,
+						INVALID_UID, INVALID_GID);
+			if (rc) {
+				cifs_dbg(FYI, "%s: Setting ACL failed with error: %d\n",
+					 __func__, rc);
+				goto cifs_setattr_exit;
+			}
+
+			/*
+			 * In case of CIFS_MOUNT_CIFS_ACL, we cannot support all modes.
+			 * Pick up the actual mode bits that were set.
+			 */
+			if (mode != attrs->ia_mode)
+				attrs->ia_mode = mode;
+		} else
+		if (((mode & S_IWUGO) == 0) &&
+		    (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
+
+			dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
+
+			/* fix up mode if we're not using dynperm */
+			if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
+				attrs->ia_mode = inode->i_mode & ~S_IWUGO;
+		} else if ((mode & S_IWUGO) &&
+			   (cifsInode->cifsAttrs & ATTR_READONLY)) {
+
+			dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
+			/* Attributes of 0 are ignored */
+			if (dosattr == 0)
+				dosattr |= ATTR_NORMAL;
+
+			/* reset local inode permissions to normal */
+			if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
+				attrs->ia_mode &= ~(S_IALLUGO);
+				if (S_ISDIR(inode->i_mode))
+					attrs->ia_mode |=
+						cifs_sb->ctx->dir_mode;
+				else
+					attrs->ia_mode |=
+						cifs_sb->ctx->file_mode;
+			}
+		} else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
+			/* ignore mode change - ATTR_READONLY hasn't changed */
+			attrs->ia_valid &= ~ATTR_MODE;
+		}
+	}
+
+	if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
+	    ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
+		rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
+		/* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
+
+		/* Even if error on time set, no sense failing the call if
+		the server would set the time to a reasonable value anyway,
+		and this check ensures that we are not being called from
+		sys_utimes in which case we ought to fail the call back to
+		the user when the server rejects the call */
+		if ((rc) && (attrs->ia_valid &
+				(ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
+			rc = 0;
+	}
+
+	/* do not need local check to inode_check_ok since the server does
+	   that */
+	if (rc)
+		goto cifs_setattr_exit;
+
+	if ((attrs->ia_valid & ATTR_SIZE) &&
+	    attrs->ia_size != i_size_read(inode)) {
+		truncate_setsize(inode, attrs->ia_size);
+		fscache_resize_cookie(cifs_inode_cookie(inode), attrs->ia_size);
+	}
+
+	setattr_copy(&init_user_ns, inode, attrs);
+	mark_inode_dirty(inode);
+
+cifs_setattr_exit:
+	free_xid(xid);
+	free_dentry_path(page);
+	return rc;
+}
+
+int
+cifs_setattr(struct user_namespace *mnt_userns, struct dentry *direntry,
+	     struct iattr *attrs)
+{
+	struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
+	int rc, retries = 0;
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+	struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb);
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+	if (unlikely(cifs_forced_shutdown(cifs_sb)))
+		return -EIO;
+
+	do {
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+		if (pTcon->unix_ext)
+			rc = cifs_setattr_unix(direntry, attrs);
+		else
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+			rc = cifs_setattr_nounix(direntry, attrs);
+		retries++;
+	} while (is_retryable_error(rc) && retries < 2);
+
+	/* BB: add cifs_setattr_legacy for really old servers */
+	return rc;
+}