fs/orangefs/orangefs-utils.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * (C) 2001 Clemson University and The University of Chicago
  *
  * See COPYING in top-level directory.
  */
 #include <linux/kernel.h>
 #include "protocol.h"
 #include "orangefs-kernel.h"
 #include "orangefs-dev-proto.h"
 #include "orangefs-bufmap.h"

 __s32 fsid_of_op(struct orangefs_kernel_op_s *op)
 {
 	__s32 fsid = ORANGEFS_FS_ID_NULL;

 	if (op) {
 		switch (op->upcall.type) {
 		case ORANGEFS_VFS_OP_FILE_IO:
 			fsid = op->upcall.req.io.refn.fs_id;
 			break;
 		case ORANGEFS_VFS_OP_LOOKUP:
 			fsid = op->upcall.req.lookup.parent_refn.fs_id;
 			break;
 		case ORANGEFS_VFS_OP_CREATE:
 			fsid = op->upcall.req.create.parent_refn.fs_id;
 			break;
 		case ORANGEFS_VFS_OP_GETATTR:
 			fsid = op->upcall.req.getattr.refn.fs_id;
 			break;
 		case ORANGEFS_VFS_OP_REMOVE:
 			fsid = op->upcall.req.remove.parent_refn.fs_id;
 			break;
 		case ORANGEFS_VFS_OP_MKDIR:
 			fsid = op->upcall.req.mkdir.parent_refn.fs_id;
 			break;
 		case ORANGEFS_VFS_OP_READDIR:
 			fsid = op->upcall.req.readdir.refn.fs_id;
 			break;
 		case ORANGEFS_VFS_OP_SETATTR:
 			fsid = op->upcall.req.setattr.refn.fs_id;
 			break;
 		case ORANGEFS_VFS_OP_SYMLINK:
 			fsid = op->upcall.req.sym.parent_refn.fs_id;
 			break;
 		case ORANGEFS_VFS_OP_RENAME:
 			fsid = op->upcall.req.rename.old_parent_refn.fs_id;
 			break;
 		case ORANGEFS_VFS_OP_STATFS:
 			fsid = op->upcall.req.statfs.fs_id;
 			break;
 		case ORANGEFS_VFS_OP_TRUNCATE:
 			fsid = op->upcall.req.truncate.refn.fs_id;
 			break;
 		case ORANGEFS_VFS_OP_RA_FLUSH:
 			fsid = op->upcall.req.ra_cache_flush.refn.fs_id;
 			break;
 		case ORANGEFS_VFS_OP_FS_UMOUNT:
 			fsid = op->upcall.req.fs_umount.fs_id;
 			break;
 		case ORANGEFS_VFS_OP_GETXATTR:
 			fsid = op->upcall.req.getxattr.refn.fs_id;
 			break;
 		case ORANGEFS_VFS_OP_SETXATTR:
 			fsid = op->upcall.req.setxattr.refn.fs_id;
 			break;
 		case ORANGEFS_VFS_OP_LISTXATTR:
 			fsid = op->upcall.req.listxattr.refn.fs_id;
 			break;
 		case ORANGEFS_VFS_OP_REMOVEXATTR:
 			fsid = op->upcall.req.removexattr.refn.fs_id;
 			break;
 		case ORANGEFS_VFS_OP_FSYNC:
 			fsid = op->upcall.req.fsync.refn.fs_id;
 			break;
 		default:
 			break;
 		}
 	}
 	return fsid;
 }

 static int orangefs_inode_flags(struct ORANGEFS_sys_attr_s *attrs)
 {
 	int flags = 0;
 	if (attrs->flags & ORANGEFS_IMMUTABLE_FL)
 		flags |= S_IMMUTABLE;
 	else
 		flags &= ~S_IMMUTABLE;
 	if (attrs->flags & ORANGEFS_APPEND_FL)
 		flags |= S_APPEND;
 	else
 		flags &= ~S_APPEND;
 	if (attrs->flags & ORANGEFS_NOATIME_FL)
 		flags |= S_NOATIME;
 	else
 		flags &= ~S_NOATIME;
 	return flags;
 }

 static int orangefs_inode_perms(struct ORANGEFS_sys_attr_s *attrs)
 {
 	int perm_mode = 0;

 	if (attrs->perms & ORANGEFS_O_EXECUTE)
 		perm_mode |= S_IXOTH;
 	if (attrs->perms & ORANGEFS_O_WRITE)
 		perm_mode |= S_IWOTH;
 	if (attrs->perms & ORANGEFS_O_READ)
 		perm_mode |= S_IROTH;

 	if (attrs->perms & ORANGEFS_G_EXECUTE)
 		perm_mode |= S_IXGRP;
 	if (attrs->perms & ORANGEFS_G_WRITE)
 		perm_mode |= S_IWGRP;
 	if (attrs->perms & ORANGEFS_G_READ)
 		perm_mode |= S_IRGRP;

 	if (attrs->perms & ORANGEFS_U_EXECUTE)
 		perm_mode |= S_IXUSR;
 	if (attrs->perms & ORANGEFS_U_WRITE)
 		perm_mode |= S_IWUSR;
 	if (attrs->perms & ORANGEFS_U_READ)
 		perm_mode |= S_IRUSR;

 	if (attrs->perms & ORANGEFS_G_SGID)
 		perm_mode |= S_ISGID;
 	if (attrs->perms & ORANGEFS_U_SUID)
 		perm_mode |= S_ISUID;

 	return perm_mode;
 }

 /*
  * NOTE: in kernel land, we never use the sys_attr->link_target for
  * anything, so don't bother copying it into the sys_attr object here.
  */
 static inline int copy_attributes_from_inode(struct inode *inode,
 					     struct ORANGEFS_sys_attr_s *attrs,
 					     struct iattr *iattr)
 {
 	umode_t tmp_mode;

 	if (!iattr || !inode || !attrs) {
 		gossip_err("NULL iattr (%p), inode (%p), attrs (%p) "
 			   "in copy_attributes_from_inode!\n",
 			   iattr,
 			   inode,
 			   attrs);
 		return -EINVAL;
 	}
 	/*
 	 * We need to be careful to only copy the attributes out of the
 	 * iattr object that we know are valid.
 	 */
 	attrs->mask = 0;
 	if (iattr->ia_valid & ATTR_UID) {
 		attrs->owner = from_kuid(&init_user_ns, iattr->ia_uid);
 		attrs->mask |= ORANGEFS_ATTR_SYS_UID;
 		gossip_debug(GOSSIP_UTILS_DEBUG, "(UID) %d\n", attrs->owner);
 	}
 	if (iattr->ia_valid & ATTR_GID) {
 		attrs->group = from_kgid(&init_user_ns, iattr->ia_gid);
 		attrs->mask |= ORANGEFS_ATTR_SYS_GID;
 		gossip_debug(GOSSIP_UTILS_DEBUG, "(GID) %d\n", attrs->group);
 	}

 	if (iattr->ia_valid & ATTR_ATIME) {
 		attrs->mask |= ORANGEFS_ATTR_SYS_ATIME;
 		if (iattr->ia_valid & ATTR_ATIME_SET) {
 			attrs->atime = (time64_t)iattr->ia_atime.tv_sec;
 			attrs->mask |= ORANGEFS_ATTR_SYS_ATIME_SET;
 		}
 	}
 	if (iattr->ia_valid & ATTR_MTIME) {
 		attrs->mask |= ORANGEFS_ATTR_SYS_MTIME;
 		if (iattr->ia_valid & ATTR_MTIME_SET) {
 			attrs->mtime = (time64_t)iattr->ia_mtime.tv_sec;
 			attrs->mask |= ORANGEFS_ATTR_SYS_MTIME_SET;
 		}
 	}
 	if (iattr->ia_valid & ATTR_CTIME)
 		attrs->mask |= ORANGEFS_ATTR_SYS_CTIME;

 	/*
 	 * ORANGEFS cannot set size with a setattr operation.  Probably not likely
 	 * to be requested through the VFS, but just in case, don't worry about
 	 * ATTR_SIZE
 	 */

 	if (iattr->ia_valid & ATTR_MODE) {
 		tmp_mode = iattr->ia_mode;
 		if (tmp_mode & (S_ISVTX)) {
 			if (is_root_handle(inode)) {
 				/*
 				 * allow sticky bit to be set on root (since
 				 * it shows up that way by default anyhow),
 				 * but don't show it to the server
 				 */
 				tmp_mode -= S_ISVTX;
 			} else {
 				gossip_debug(GOSSIP_UTILS_DEBUG,
 					     "User attempted to set sticky bit on non-root directory; returning EINVAL.\n");
 				return -EINVAL;
 			}
 		}

 		if (tmp_mode & (S_ISUID)) {
 			gossip_debug(GOSSIP_UTILS_DEBUG,
 				     "Attempting to set setuid bit (not supported); returning EINVAL.\n");
 			return -EINVAL;
 		}

 		attrs->perms = ORANGEFS_util_translate_mode(tmp_mode);
 		attrs->mask |= ORANGEFS_ATTR_SYS_PERM;
 	}

 	return 0;
 }

 static int orangefs_inode_type(enum orangefs_ds_type objtype)
 {
 	if (objtype == ORANGEFS_TYPE_METAFILE)
 		return S_IFREG;
 	else if (objtype == ORANGEFS_TYPE_DIRECTORY)
 		return S_IFDIR;
 	else if (objtype == ORANGEFS_TYPE_SYMLINK)
 		return S_IFLNK;
 	else
 		return -1;
 }

 static void orangefs_make_bad_inode(struct inode *inode)
 {
 	if (is_root_handle(inode)) {
 		/*
 		 * if this occurs, the pvfs2-client-core was killed but we
 		 * can't afford to lose the inode operations and such
 		 * associated with the root handle in any case.
 		 */
 		gossip_debug(GOSSIP_UTILS_DEBUG,
 			     "*** NOT making bad root inode %pU\n",
 			     get_khandle_from_ino(inode));
 	} else {
 		gossip_debug(GOSSIP_UTILS_DEBUG,
 			     "*** making bad inode %pU\n",
 			     get_khandle_from_ino(inode));
 		make_bad_inode(inode);
 	}
 }

 static int orangefs_inode_is_stale(struct inode *inode,
     struct ORANGEFS_sys_attr_s *attrs, char *link_target)
 {
 	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 	int type = orangefs_inode_type(attrs->objtype);
 	/*
 	 * If the inode type or symlink target have changed then this
 	 * inode is stale.
 	 */
 	if (type == -1 || !(inode->i_mode & type)) {
 		orangefs_make_bad_inode(inode);
 		return 1;
 	}
 	if (type == S_IFLNK && strncmp(orangefs_inode->link_target,
 	    link_target, ORANGEFS_NAME_MAX)) {
 		orangefs_make_bad_inode(inode);
 		return 1;
 	}
 	return 0;
 }

 int orangefs_inode_getattr(struct inode *inode, int new, int bypass,
     u32 request_mask)
 {
 	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 	struct orangefs_kernel_op_s *new_op;
 	loff_t inode_size, rounded_up_size;
 	int ret, type;

 	gossip_debug(GOSSIP_UTILS_DEBUG, "%s: called on inode %pU\n", __func__,
 	    get_khandle_from_ino(inode));

 	if (!new && !bypass) {
 		/*
 		 * Must have all the attributes in the mask and be within cache
 		 * time.
 		 */
 		if ((request_mask & orangefs_inode->getattr_mask) ==
 		    request_mask &&
 		    time_before(jiffies, orangefs_inode->getattr_time))
 			return 0;
 	}

 	new_op = op_alloc(ORANGEFS_VFS_OP_GETATTR);
 	if (!new_op)
 		return -ENOMEM;
 	new_op->upcall.req.getattr.refn = orangefs_inode->refn;
 	/*
 	 * Size is the hardest attribute to get.  The incremental cost of any
 	 * other attribute is essentially zero.
 	 */
 	if (request_mask & STATX_SIZE || new)
 		new_op->upcall.req.getattr.mask = ORANGEFS_ATTR_SYS_ALL_NOHINT;
 	else
 		new_op->upcall.req.getattr.mask =
 		    ORANGEFS_ATTR_SYS_ALL_NOHINT & ~ORANGEFS_ATTR_SYS_SIZE;

 	ret = service_operation(new_op, __func__,
 	    get_interruptible_flag(inode));
 	if (ret != 0)
 		goto out;

 	if (!new) {
 		ret = orangefs_inode_is_stale(inode,
 		    &new_op->downcall.resp.getattr.attributes,
 		    new_op->downcall.resp.getattr.link_target);
 		if (ret) {
 			ret = -ESTALE;
 			goto out;
 		}
 	}

 	type = orangefs_inode_type(new_op->
 	    downcall.resp.getattr.attributes.objtype);
 	switch (type) {
 	case S_IFREG:
 		inode->i_flags = orangefs_inode_flags(&new_op->
 		    downcall.resp.getattr.attributes);
 		if (request_mask & STATX_SIZE || new) {
 			inode_size = (loff_t)new_op->
 			    downcall.resp.getattr.attributes.size;
 			rounded_up_size =
 			    (inode_size + (4096 - (inode_size % 4096)));
 			inode->i_size = inode_size;
 			orangefs_inode->blksize =
 			    new_op->downcall.resp.getattr.attributes.blksize;
 			spin_lock(&inode->i_lock);
 			inode->i_bytes = inode_size;
 			inode->i_blocks =
 			    (unsigned long)(rounded_up_size / 512);
 			spin_unlock(&inode->i_lock);
 		}
 		break;
 	case S_IFDIR:
 		if (request_mask & STATX_SIZE || new) {
 			inode->i_size = PAGE_SIZE;
 			orangefs_inode->blksize = i_blocksize(inode);
 			spin_lock(&inode->i_lock);
 			inode_set_bytes(inode, inode->i_size);
 			spin_unlock(&inode->i_lock);
 		}
 		set_nlink(inode, 1);
 		break;
 	case S_IFLNK:
 		if (new) {
 			inode->i_size = (loff_t)strlen(new_op->
 			    downcall.resp.getattr.link_target);
 			orangefs_inode->blksize = i_blocksize(inode);
 			ret = strscpy(orangefs_inode->link_target,
 			    new_op->downcall.resp.getattr.link_target,
 			    ORANGEFS_NAME_MAX);
 			if (ret == -E2BIG) {
 				ret = -EIO;
 				goto out;
 			}
 			inode->i_link = orangefs_inode->link_target;
 		}
 		break;
 	/* i.e. -1 */
 	default:
 		/* XXX: ESTALE?  This is what is done if it is not new. */
 		orangefs_make_bad_inode(inode);
 		ret = -ESTALE;
 		goto out;
 	}

 	inode->i_uid = make_kuid(&init_user_ns, new_op->
 	    downcall.resp.getattr.attributes.owner);
 	inode->i_gid = make_kgid(&init_user_ns, new_op->
 	    downcall.resp.getattr.attributes.group);
 	inode->i_atime.tv_sec = (time64_t)new_op->
 	    downcall.resp.getattr.attributes.atime;
 	inode->i_mtime.tv_sec = (time64_t)new_op->
 	    downcall.resp.getattr.attributes.mtime;
 	inode->i_ctime.tv_sec = (time64_t)new_op->
 	    downcall.resp.getattr.attributes.ctime;
 	inode->i_atime.tv_nsec = 0;
 	inode->i_mtime.tv_nsec = 0;
 	inode->i_ctime.tv_nsec = 0;

 	/* special case: mark the root inode as sticky */
 	inode->i_mode = type | (is_root_handle(inode) ? S_ISVTX : 0) |
 	    orangefs_inode_perms(&new_op->downcall.resp.getattr.attributes);

 	orangefs_inode->getattr_time = jiffies +
 	    orangefs_getattr_timeout_msecs*HZ/1000;
 	if (request_mask & STATX_SIZE || new)
 		orangefs_inode->getattr_mask = STATX_BASIC_STATS;
 	else
 		orangefs_inode->getattr_mask = STATX_BASIC_STATS & ~STATX_SIZE;
 	ret = 0;
 out:
 	op_release(new_op);
 	return ret;
 }

 int orangefs_inode_check_changed(struct inode *inode)
 {
 	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 	struct orangefs_kernel_op_s *new_op;
 	int ret;

 	gossip_debug(GOSSIP_UTILS_DEBUG, "%s: called on inode %pU\n", __func__,
 	    get_khandle_from_ino(inode));

 	new_op = op_alloc(ORANGEFS_VFS_OP_GETATTR);
 	if (!new_op)
 		return -ENOMEM;
 	new_op->upcall.req.getattr.refn = orangefs_inode->refn;
 	new_op->upcall.req.getattr.mask = ORANGEFS_ATTR_SYS_TYPE |
 	    ORANGEFS_ATTR_SYS_LNK_TARGET;

 	ret = service_operation(new_op, __func__,
 	    get_interruptible_flag(inode));
 	if (ret != 0)
 		goto out;

 	ret = orangefs_inode_is_stale(inode,
 	    &new_op->downcall.resp.getattr.attributes,
 	    new_op->downcall.resp.getattr.link_target);
 out:
 	op_release(new_op);
 	return ret;
 }

 /*
  * issues a orangefs setattr request to make sure the new attribute values
  * take effect if successful.  returns 0 on success; -errno otherwise
  */
 int orangefs_inode_setattr(struct inode *inode, struct iattr *iattr)
 {
 	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 	struct orangefs_kernel_op_s *new_op;
 	int ret;

 	new_op = op_alloc(ORANGEFS_VFS_OP_SETATTR);
 	if (!new_op)
 		return -ENOMEM;

 	new_op->upcall.req.setattr.refn = orangefs_inode->refn;
 	ret = copy_attributes_from_inode(inode,
 		       &new_op->upcall.req.setattr.attributes,
 		       iattr);
 	if (ret >= 0) {
 		ret = service_operation(new_op, __func__,
 				get_interruptible_flag(inode));

 		gossip_debug(GOSSIP_UTILS_DEBUG,
 			     "orangefs_inode_setattr: returning %d\n",
 			     ret);
 	}

 	op_release(new_op);

 	if (ret == 0)
 		orangefs_inode->getattr_time = jiffies - 1;

 	return ret;
 }

 /*
  * The following is a very dirty hack that is now a permanent part of the
  * ORANGEFS protocol. See protocol.h for more error definitions.
  */

 /* The order matches include/orangefs-types.h in the OrangeFS source. */
 static int PINT_errno_mapping[] = {
 	0, EPERM, ENOENT, EINTR, EIO, ENXIO, EBADF, EAGAIN, ENOMEM,
 	EFAULT, EBUSY, EEXIST, ENODEV, ENOTDIR, EISDIR, EINVAL, EMFILE,
 	EFBIG, ENOSPC, EROFS, EMLINK, EPIPE, EDEADLK, ENAMETOOLONG,
 	ENOLCK, ENOSYS, ENOTEMPTY, ELOOP, EWOULDBLOCK, ENOMSG, EUNATCH,
 	EBADR, EDEADLOCK, ENODATA, ETIME, ENONET, EREMOTE, ECOMM,
 	EPROTO, EBADMSG, EOVERFLOW, ERESTART, EMSGSIZE, EPROTOTYPE,
 	ENOPROTOOPT, EPROTONOSUPPORT, EOPNOTSUPP, EADDRINUSE,
 	EADDRNOTAVAIL, ENETDOWN, ENETUNREACH, ENETRESET, ENOBUFS,
 	ETIMEDOUT, ECONNREFUSED, EHOSTDOWN, EHOSTUNREACH, EALREADY,
 	EACCES, ECONNRESET, ERANGE
 };

 int orangefs_normalize_to_errno(__s32 error_code)
 {
 	__u32 i;

 	/* Success */
 	if (error_code == 0) {
 		return 0;
 	/*
 	 * This shouldn't ever happen. If it does it should be fixed on the
 	 * server.
 	 */
 	} else if (error_code > 0) {
 		gossip_err("orangefs: error status received.\n");
 		gossip_err("orangefs: assuming error code is inverted.\n");
 		error_code = -error_code;
 	}

 	/*
 	 * XXX: This is very bad since error codes from ORANGEFS may not be
 	 * suitable for return into userspace.
 	 */

 	/*
 	 * Convert ORANGEFS error values into errno values suitable for return
 	 * from the kernel.
 	 */
 	if ((-error_code) & ORANGEFS_NON_ERRNO_ERROR_BIT) {
 		if (((-error_code) &
 		    (ORANGEFS_ERROR_NUMBER_BITS|ORANGEFS_NON_ERRNO_ERROR_BIT|
 		    ORANGEFS_ERROR_BIT)) == ORANGEFS_ECANCEL) {
 			/*
 			 * cancellation error codes generally correspond to
 			 * a timeout from the client's perspective
 			 */
 			error_code = -ETIMEDOUT;
 		} else {
 			/* assume a default error code */
 			gossip_err("orangefs: warning: got error code without errno equivalent: %d.\n", error_code);
 			error_code = -EINVAL;
 		}

 	/* Convert ORANGEFS encoded errno values into regular errno values. */
 	} else if ((-error_code) & ORANGEFS_ERROR_BIT) {
 		i = (-error_code) & ~(ORANGEFS_ERROR_BIT|ORANGEFS_ERROR_CLASS_BITS);
 		if (i < ARRAY_SIZE(PINT_errno_mapping))
 			error_code = -PINT_errno_mapping[i];
 		else
 			error_code = -EINVAL;

 	/*
 	 * Only ORANGEFS protocol error codes should ever come here. Otherwise
 	 * there is a bug somewhere.
 	 */
 	} else {
 		gossip_err("orangefs: orangefs_normalize_to_errno: got error code which is not from ORANGEFS.\n");
 		error_code = -EINVAL;
 	}
 	return error_code;
 }

 #define NUM_MODES 11
 __s32 ORANGEFS_util_translate_mode(int mode)
 {
 	int ret = 0;
 	int i = 0;
 	static int modes[NUM_MODES] = {
 		S_IXOTH, S_IWOTH, S_IROTH,
 		S_IXGRP, S_IWGRP, S_IRGRP,
 		S_IXUSR, S_IWUSR, S_IRUSR,
 		S_ISGID, S_ISUID
 	};
 	static int orangefs_modes[NUM_MODES] = {
 		ORANGEFS_O_EXECUTE, ORANGEFS_O_WRITE, ORANGEFS_O_READ,
 		ORANGEFS_G_EXECUTE, ORANGEFS_G_WRITE, ORANGEFS_G_READ,
 		ORANGEFS_U_EXECUTE, ORANGEFS_U_WRITE, ORANGEFS_U_READ,
 		ORANGEFS_G_SGID, ORANGEFS_U_SUID
 	};

 	for (i = 0; i < NUM_MODES; i++)
 		if (mode & modes[i])
 			ret |= orangefs_modes[i];

 	return ret;
 }
 #undef NUM_MODES
	// SPDX-License-Identifier: GPL-2.0
	/*
	* (C) 2001 Clemson University and The University of Chicago
	*
	* See COPYING in top-level directory.
	*/
	#include <linux/kernel.h>
	#include "protocol.h"
	#include "orangefs-kernel.h"
	#include "orangefs-dev-proto.h"
	#include "orangefs-bufmap.h"

	__s32 fsid_of_op(struct orangefs_kernel_op_s *op)
	{
	__s32 fsid = ORANGEFS_FS_ID_NULL;

	if (op) {
	switch (op->upcall.type) {
	case ORANGEFS_VFS_OP_FILE_IO:
	fsid = op->upcall.req.io.refn.fs_id;
	break;
	case ORANGEFS_VFS_OP_LOOKUP:
	fsid = op->upcall.req.lookup.parent_refn.fs_id;
	break;
	case ORANGEFS_VFS_OP_CREATE:
	fsid = op->upcall.req.create.parent_refn.fs_id;
	break;
	case ORANGEFS_VFS_OP_GETATTR:
	fsid = op->upcall.req.getattr.refn.fs_id;
	break;
	case ORANGEFS_VFS_OP_REMOVE:
	fsid = op->upcall.req.remove.parent_refn.fs_id;
	break;
	case ORANGEFS_VFS_OP_MKDIR:
	fsid = op->upcall.req.mkdir.parent_refn.fs_id;
	break;
	case ORANGEFS_VFS_OP_READDIR:
	fsid = op->upcall.req.readdir.refn.fs_id;
	break;
	case ORANGEFS_VFS_OP_SETATTR:
	fsid = op->upcall.req.setattr.refn.fs_id;
	break;
	case ORANGEFS_VFS_OP_SYMLINK:
	fsid = op->upcall.req.sym.parent_refn.fs_id;
	break;
	case ORANGEFS_VFS_OP_RENAME:
	fsid = op->upcall.req.rename.old_parent_refn.fs_id;
	break;
	case ORANGEFS_VFS_OP_STATFS:
	fsid = op->upcall.req.statfs.fs_id;
	break;
	case ORANGEFS_VFS_OP_TRUNCATE:
	fsid = op->upcall.req.truncate.refn.fs_id;
	break;
	case ORANGEFS_VFS_OP_RA_FLUSH:
	fsid = op->upcall.req.ra_cache_flush.refn.fs_id;
	break;
	case ORANGEFS_VFS_OP_FS_UMOUNT:
	fsid = op->upcall.req.fs_umount.fs_id;
	break;
	case ORANGEFS_VFS_OP_GETXATTR:
	fsid = op->upcall.req.getxattr.refn.fs_id;
	break;
	case ORANGEFS_VFS_OP_SETXATTR:
	fsid = op->upcall.req.setxattr.refn.fs_id;
	break;
	case ORANGEFS_VFS_OP_LISTXATTR:
	fsid = op->upcall.req.listxattr.refn.fs_id;
	break;
	case ORANGEFS_VFS_OP_REMOVEXATTR:
	fsid = op->upcall.req.removexattr.refn.fs_id;
	break;
	case ORANGEFS_VFS_OP_FSYNC:
	fsid = op->upcall.req.fsync.refn.fs_id;
	break;
	default:
	break;
	}
	}
	return fsid;
	}

	static int orangefs_inode_flags(struct ORANGEFS_sys_attr_s *attrs)
	{
	int flags = 0;
	if (attrs->flags & ORANGEFS_IMMUTABLE_FL)
	flags \|= S_IMMUTABLE;
	else
	flags &= ~S_IMMUTABLE;
	if (attrs->flags & ORANGEFS_APPEND_FL)
	flags \|= S_APPEND;
	else
	flags &= ~S_APPEND;
	if (attrs->flags & ORANGEFS_NOATIME_FL)
	flags \|= S_NOATIME;
	else
	flags &= ~S_NOATIME;
	return flags;
	}

	static int orangefs_inode_perms(struct ORANGEFS_sys_attr_s *attrs)
	{
	int perm_mode = 0;

	if (attrs->perms & ORANGEFS_O_EXECUTE)
	perm_mode \|= S_IXOTH;
	if (attrs->perms & ORANGEFS_O_WRITE)
	perm_mode \|= S_IWOTH;
	if (attrs->perms & ORANGEFS_O_READ)
	perm_mode \|= S_IROTH;

	if (attrs->perms & ORANGEFS_G_EXECUTE)
	perm_mode \|= S_IXGRP;
	if (attrs->perms & ORANGEFS_G_WRITE)
	perm_mode \|= S_IWGRP;
	if (attrs->perms & ORANGEFS_G_READ)
	perm_mode \|= S_IRGRP;

	if (attrs->perms & ORANGEFS_U_EXECUTE)
	perm_mode \|= S_IXUSR;
	if (attrs->perms & ORANGEFS_U_WRITE)
	perm_mode \|= S_IWUSR;
	if (attrs->perms & ORANGEFS_U_READ)
	perm_mode \|= S_IRUSR;

	if (attrs->perms & ORANGEFS_G_SGID)
	perm_mode \|= S_ISGID;
	if (attrs->perms & ORANGEFS_U_SUID)
	perm_mode \|= S_ISUID;

	return perm_mode;
	}

	/*
	* NOTE: in kernel land, we never use the sys_attr->link_target for
	* anything, so don't bother copying it into the sys_attr object here.
	*/
	static inline int copy_attributes_from_inode(struct inode *inode,
	struct ORANGEFS_sys_attr_s *attrs,
	struct iattr *iattr)
	{
	umode_t tmp_mode;

	if (!iattr \|\| !inode \|\| !attrs) {
	gossip_err("NULL iattr (%p), inode (%p), attrs (%p) "
	"in copy_attributes_from_inode!\n",
	iattr,
	inode,
	attrs);
	return -EINVAL;
	}
	/*
	* We need to be careful to only copy the attributes out of the
	* iattr object that we know are valid.
	*/
	attrs->mask = 0;
	if (iattr->ia_valid & ATTR_UID) {
	attrs->owner = from_kuid(&init_user_ns, iattr->ia_uid);
	attrs->mask \|= ORANGEFS_ATTR_SYS_UID;
	gossip_debug(GOSSIP_UTILS_DEBUG, "(UID) %d\n", attrs->owner);
	}
	if (iattr->ia_valid & ATTR_GID) {
	attrs->group = from_kgid(&init_user_ns, iattr->ia_gid);
	attrs->mask \|= ORANGEFS_ATTR_SYS_GID;
	gossip_debug(GOSSIP_UTILS_DEBUG, "(GID) %d\n", attrs->group);
	}

	if (iattr->ia_valid & ATTR_ATIME) {
	attrs->mask \|= ORANGEFS_ATTR_SYS_ATIME;
	if (iattr->ia_valid & ATTR_ATIME_SET) {
	attrs->atime = (time64_t)iattr->ia_atime.tv_sec;
	attrs->mask \|= ORANGEFS_ATTR_SYS_ATIME_SET;
	}
	}
	if (iattr->ia_valid & ATTR_MTIME) {
	attrs->mask \|= ORANGEFS_ATTR_SYS_MTIME;
	if (iattr->ia_valid & ATTR_MTIME_SET) {
	attrs->mtime = (time64_t)iattr->ia_mtime.tv_sec;
	attrs->mask \|= ORANGEFS_ATTR_SYS_MTIME_SET;
	}
	}
	if (iattr->ia_valid & ATTR_CTIME)
	attrs->mask \|= ORANGEFS_ATTR_SYS_CTIME;

	/*
	* ORANGEFS cannot set size with a setattr operation. Probably not likely
	* to be requested through the VFS, but just in case, don't worry about
	* ATTR_SIZE
	*/

	if (iattr->ia_valid & ATTR_MODE) {
	tmp_mode = iattr->ia_mode;
	if (tmp_mode & (S_ISVTX)) {
	if (is_root_handle(inode)) {
	/*
	* allow sticky bit to be set on root (since
	* it shows up that way by default anyhow),
	* but don't show it to the server
	*/
	tmp_mode -= S_ISVTX;
	} else {
	gossip_debug(GOSSIP_UTILS_DEBUG,
	"User attempted to set sticky bit on non-root directory; returning EINVAL.\n");
	return -EINVAL;
	}
	}

	if (tmp_mode & (S_ISUID)) {
	gossip_debug(GOSSIP_UTILS_DEBUG,
	"Attempting to set setuid bit (not supported); returning EINVAL.\n");
	return -EINVAL;
	}

	attrs->perms = ORANGEFS_util_translate_mode(tmp_mode);
	attrs->mask \|= ORANGEFS_ATTR_SYS_PERM;
	}

	return 0;
	}

	static int orangefs_inode_type(enum orangefs_ds_type objtype)
	{
	if (objtype == ORANGEFS_TYPE_METAFILE)
	return S_IFREG;
	else if (objtype == ORANGEFS_TYPE_DIRECTORY)
	return S_IFDIR;
	else if (objtype == ORANGEFS_TYPE_SYMLINK)
	return S_IFLNK;
	else
	return -1;
	}

	static void orangefs_make_bad_inode(struct inode *inode)
	{
	if (is_root_handle(inode)) {
	/*
	* if this occurs, the pvfs2-client-core was killed but we
	* can't afford to lose the inode operations and such
	* associated with the root handle in any case.
	*/
	gossip_debug(GOSSIP_UTILS_DEBUG,
	"*** NOT making bad root inode %pU\n",
	get_khandle_from_ino(inode));
	} else {
	gossip_debug(GOSSIP_UTILS_DEBUG,
	"*** making bad inode %pU\n",
	get_khandle_from_ino(inode));
	make_bad_inode(inode);
	}
	}

	static int orangefs_inode_is_stale(struct inode *inode,
	struct ORANGEFS_sys_attr_s attrs, char link_target)
	{
	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
	int type = orangefs_inode_type(attrs->objtype);
	/*
	* If the inode type or symlink target have changed then this
	* inode is stale.
	*/
	if (type == -1 \|\| !(inode->i_mode & type)) {
	orangefs_make_bad_inode(inode);
	return 1;
	}
	if (type == S_IFLNK && strncmp(orangefs_inode->link_target,
	link_target, ORANGEFS_NAME_MAX)) {
	orangefs_make_bad_inode(inode);
	return 1;
	}
	return 0;
	}

	int orangefs_inode_getattr(struct inode *inode, int new, int bypass,
	u32 request_mask)
	{
	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
	struct orangefs_kernel_op_s *new_op;
	loff_t inode_size, rounded_up_size;
	int ret, type;

	gossip_debug(GOSSIP_UTILS_DEBUG, "%s: called on inode %pU\n", __func__,
	get_khandle_from_ino(inode));

	if (!new && !bypass) {
	/*
	* Must have all the attributes in the mask and be within cache
	* time.
	*/
	if ((request_mask & orangefs_inode->getattr_mask) ==
	request_mask &&
	time_before(jiffies, orangefs_inode->getattr_time))
	return 0;
	}

	new_op = op_alloc(ORANGEFS_VFS_OP_GETATTR);
	if (!new_op)
	return -ENOMEM;
	new_op->upcall.req.getattr.refn = orangefs_inode->refn;
	/*
	* Size is the hardest attribute to get. The incremental cost of any
	* other attribute is essentially zero.
	*/
	if (request_mask & STATX_SIZE \|\| new)
	new_op->upcall.req.getattr.mask = ORANGEFS_ATTR_SYS_ALL_NOHINT;
	else
	new_op->upcall.req.getattr.mask =
	ORANGEFS_ATTR_SYS_ALL_NOHINT & ~ORANGEFS_ATTR_SYS_SIZE;

	ret = service_operation(new_op, __func__,
	get_interruptible_flag(inode));
	if (ret != 0)
	goto out;

	if (!new) {
	ret = orangefs_inode_is_stale(inode,
	&new_op->downcall.resp.getattr.attributes,
	new_op->downcall.resp.getattr.link_target);
	if (ret) {
	ret = -ESTALE;
	goto out;
	}
	}

	type = orangefs_inode_type(new_op->
	downcall.resp.getattr.attributes.objtype);
	switch (type) {
	case S_IFREG:
	inode->i_flags = orangefs_inode_flags(&new_op->
	downcall.resp.getattr.attributes);
	if (request_mask & STATX_SIZE \|\| new) {
	inode_size = (loff_t)new_op->
	downcall.resp.getattr.attributes.size;
	rounded_up_size =
	(inode_size + (4096 - (inode_size % 4096)));
	inode->i_size = inode_size;
	orangefs_inode->blksize =
	new_op->downcall.resp.getattr.attributes.blksize;
	spin_lock(&inode->i_lock);
	inode->i_bytes = inode_size;
	inode->i_blocks =
	(unsigned long)(rounded_up_size / 512);
	spin_unlock(&inode->i_lock);
	}
	break;
	case S_IFDIR:
	if (request_mask & STATX_SIZE \|\| new) {
	inode->i_size = PAGE_SIZE;
	orangefs_inode->blksize = i_blocksize(inode);
	spin_lock(&inode->i_lock);
	inode_set_bytes(inode, inode->i_size);
	spin_unlock(&inode->i_lock);
	}
	set_nlink(inode, 1);
	break;
	case S_IFLNK:
	if (new) {
	inode->i_size = (loff_t)strlen(new_op->
	downcall.resp.getattr.link_target);
	orangefs_inode->blksize = i_blocksize(inode);
	ret = strscpy(orangefs_inode->link_target,
	new_op->downcall.resp.getattr.link_target,
	ORANGEFS_NAME_MAX);
	if (ret == -E2BIG) {
	ret = -EIO;
	goto out;
	}
	inode->i_link = orangefs_inode->link_target;
	}
	break;
	/* i.e. -1 */
	default:
	/* XXX: ESTALE? This is what is done if it is not new. */
	orangefs_make_bad_inode(inode);
	ret = -ESTALE;
	goto out;
	}

	inode->i_uid = make_kuid(&init_user_ns, new_op->
	downcall.resp.getattr.attributes.owner);
	inode->i_gid = make_kgid(&init_user_ns, new_op->
	downcall.resp.getattr.attributes.group);
	inode->i_atime.tv_sec = (time64_t)new_op->
	downcall.resp.getattr.attributes.atime;
	inode->i_mtime.tv_sec = (time64_t)new_op->
	downcall.resp.getattr.attributes.mtime;
	inode->i_ctime.tv_sec = (time64_t)new_op->
	downcall.resp.getattr.attributes.ctime;
	inode->i_atime.tv_nsec = 0;
	inode->i_mtime.tv_nsec = 0;
	inode->i_ctime.tv_nsec = 0;

	/* special case: mark the root inode as sticky */
	inode->i_mode = type \| (is_root_handle(inode) ? S_ISVTX : 0) \|
	orangefs_inode_perms(&new_op->downcall.resp.getattr.attributes);

	orangefs_inode->getattr_time = jiffies +
	orangefs_getattr_timeout_msecs*HZ/1000;
	if (request_mask & STATX_SIZE \|\| new)
	orangefs_inode->getattr_mask = STATX_BASIC_STATS;
	else
	orangefs_inode->getattr_mask = STATX_BASIC_STATS & ~STATX_SIZE;
	ret = 0;
	out:
	op_release(new_op);
	return ret;
	}

	int orangefs_inode_check_changed(struct inode *inode)
	{
	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
	struct orangefs_kernel_op_s *new_op;
	int ret;

	gossip_debug(GOSSIP_UTILS_DEBUG, "%s: called on inode %pU\n", __func__,
	get_khandle_from_ino(inode));

	new_op = op_alloc(ORANGEFS_VFS_OP_GETATTR);
	if (!new_op)
	return -ENOMEM;
	new_op->upcall.req.getattr.refn = orangefs_inode->refn;
	new_op->upcall.req.getattr.mask = ORANGEFS_ATTR_SYS_TYPE \|
	ORANGEFS_ATTR_SYS_LNK_TARGET;

	ret = service_operation(new_op, __func__,
	get_interruptible_flag(inode));
	if (ret != 0)
	goto out;

	ret = orangefs_inode_is_stale(inode,
	&new_op->downcall.resp.getattr.attributes,
	new_op->downcall.resp.getattr.link_target);
	out:
	op_release(new_op);
	return ret;
	}

	/*
	* issues a orangefs setattr request to make sure the new attribute values
	* take effect if successful. returns 0 on success; -errno otherwise
	*/
	int orangefs_inode_setattr(struct inode inode, struct iattr iattr)
	{
	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
	struct orangefs_kernel_op_s *new_op;
	int ret;

	new_op = op_alloc(ORANGEFS_VFS_OP_SETATTR);
	if (!new_op)
	return -ENOMEM;

	new_op->upcall.req.setattr.refn = orangefs_inode->refn;
	ret = copy_attributes_from_inode(inode,
	&new_op->upcall.req.setattr.attributes,
	iattr);
	if (ret >= 0) {
	ret = service_operation(new_op, __func__,
	get_interruptible_flag(inode));

	gossip_debug(GOSSIP_UTILS_DEBUG,
	"orangefs_inode_setattr: returning %d\n",
	ret);
	}

	op_release(new_op);

	if (ret == 0)
	orangefs_inode->getattr_time = jiffies - 1;

	return ret;
	}

	/*
	* The following is a very dirty hack that is now a permanent part of the
	* ORANGEFS protocol. See protocol.h for more error definitions.
	*/

	/* The order matches include/orangefs-types.h in the OrangeFS source. */
	static int PINT_errno_mapping[] = {
	0, EPERM, ENOENT, EINTR, EIO, ENXIO, EBADF, EAGAIN, ENOMEM,
	EFAULT, EBUSY, EEXIST, ENODEV, ENOTDIR, EISDIR, EINVAL, EMFILE,
	EFBIG, ENOSPC, EROFS, EMLINK, EPIPE, EDEADLK, ENAMETOOLONG,
	ENOLCK, ENOSYS, ENOTEMPTY, ELOOP, EWOULDBLOCK, ENOMSG, EUNATCH,
	EBADR, EDEADLOCK, ENODATA, ETIME, ENONET, EREMOTE, ECOMM,
	EPROTO, EBADMSG, EOVERFLOW, ERESTART, EMSGSIZE, EPROTOTYPE,
	ENOPROTOOPT, EPROTONOSUPPORT, EOPNOTSUPP, EADDRINUSE,
	EADDRNOTAVAIL, ENETDOWN, ENETUNREACH, ENETRESET, ENOBUFS,
	ETIMEDOUT, ECONNREFUSED, EHOSTDOWN, EHOSTUNREACH, EALREADY,
	EACCES, ECONNRESET, ERANGE
	};

	int orangefs_normalize_to_errno(__s32 error_code)
	{
	__u32 i;

	/* Success */
	if (error_code == 0) {
	return 0;
	/*
	* This shouldn't ever happen. If it does it should be fixed on the
	* server.
	*/
	} else if (error_code > 0) {
	gossip_err("orangefs: error status received.\n");
	gossip_err("orangefs: assuming error code is inverted.\n");
	error_code = -error_code;
	}

	/*
	* XXX: This is very bad since error codes from ORANGEFS may not be
	* suitable for return into userspace.
	*/

	/*
	* Convert ORANGEFS error values into errno values suitable for return
	* from the kernel.
	*/
	if ((-error_code) & ORANGEFS_NON_ERRNO_ERROR_BIT) {
	if (((-error_code) &
	(ORANGEFS_ERROR_NUMBER_BITS\|ORANGEFS_NON_ERRNO_ERROR_BIT\|
	ORANGEFS_ERROR_BIT)) == ORANGEFS_ECANCEL) {
	/*
	* cancellation error codes generally correspond to
	* a timeout from the client's perspective
	*/
	error_code = -ETIMEDOUT;
	} else {
	/* assume a default error code */
	gossip_err("orangefs: warning: got error code without errno equivalent: %d.\n", error_code);
	error_code = -EINVAL;
	}

	/* Convert ORANGEFS encoded errno values into regular errno values. */
	} else if ((-error_code) & ORANGEFS_ERROR_BIT) {
	i = (-error_code) & ~(ORANGEFS_ERROR_BIT\|ORANGEFS_ERROR_CLASS_BITS);
	if (i < ARRAY_SIZE(PINT_errno_mapping))
	error_code = -PINT_errno_mapping[i];
	else
	error_code = -EINVAL;

	/*
	* Only ORANGEFS protocol error codes should ever come here. Otherwise
	* there is a bug somewhere.
	*/
	} else {
	gossip_err("orangefs: orangefs_normalize_to_errno: got error code which is not from ORANGEFS.\n");
	error_code = -EINVAL;
	}
	return error_code;
	}

	#define NUM_MODES 11
	__s32 ORANGEFS_util_translate_mode(int mode)
	{
	int ret = 0;
	int i = 0;
	static int modes[NUM_MODES] = {
	S_IXOTH, S_IWOTH, S_IROTH,
	S_IXGRP, S_IWGRP, S_IRGRP,
	S_IXUSR, S_IWUSR, S_IRUSR,
	S_ISGID, S_ISUID
	};
	static int orangefs_modes[NUM_MODES] = {
	ORANGEFS_O_EXECUTE, ORANGEFS_O_WRITE, ORANGEFS_O_READ,
	ORANGEFS_G_EXECUTE, ORANGEFS_G_WRITE, ORANGEFS_G_READ,
	ORANGEFS_U_EXECUTE, ORANGEFS_U_WRITE, ORANGEFS_U_READ,
	ORANGEFS_G_SGID, ORANGEFS_U_SUID
	};

	for (i = 0; i < NUM_MODES; i++)
	if (mode & modes[i])
	ret \|= orangefs_modes[i];

	return ret;
	}
	#undef NUM_MODES