fs/orangefs/pvfs2-utils.c

/*
 * (C) 2001 Clemson University and The University of Chicago
 *
 * See COPYING in top-level directory.
 */
#include "protocol.h"
#include "pvfs2-kernel.h"
#include "pvfs2-dev-proto.h"
#include "pvfs2-bufmap.h"

__s32 fsid_of_op(struct pvfs2_kernel_op_s *op)
{
	__s32 fsid = PVFS_FS_ID_NULL;

	if (op) {
		switch (op->upcall.type) {
		case PVFS2_VFS_OP_FILE_IO:
			fsid = op->upcall.req.io.refn.fs_id;
			break;
		case PVFS2_VFS_OP_LOOKUP:
			fsid = op->upcall.req.lookup.parent_refn.fs_id;
			break;
		case PVFS2_VFS_OP_CREATE:
			fsid = op->upcall.req.create.parent_refn.fs_id;
			break;
		case PVFS2_VFS_OP_GETATTR:
			fsid = op->upcall.req.getattr.refn.fs_id;
			break;
		case PVFS2_VFS_OP_REMOVE:
			fsid = op->upcall.req.remove.parent_refn.fs_id;
			break;
		case PVFS2_VFS_OP_MKDIR:
			fsid = op->upcall.req.mkdir.parent_refn.fs_id;
			break;
		case PVFS2_VFS_OP_READDIR:
			fsid = op->upcall.req.readdir.refn.fs_id;
			break;
		case PVFS2_VFS_OP_SETATTR:
			fsid = op->upcall.req.setattr.refn.fs_id;
			break;
		case PVFS2_VFS_OP_SYMLINK:
			fsid = op->upcall.req.sym.parent_refn.fs_id;
			break;
		case PVFS2_VFS_OP_RENAME:
			fsid = op->upcall.req.rename.old_parent_refn.fs_id;
			break;
		case PVFS2_VFS_OP_STATFS:
			fsid = op->upcall.req.statfs.fs_id;
			break;
		case PVFS2_VFS_OP_TRUNCATE:
			fsid = op->upcall.req.truncate.refn.fs_id;
			break;
		case PVFS2_VFS_OP_MMAP_RA_FLUSH:
			fsid = op->upcall.req.ra_cache_flush.refn.fs_id;
			break;
		case PVFS2_VFS_OP_FS_UMOUNT:
			fsid = op->upcall.req.fs_umount.fs_id;
			break;
		case PVFS2_VFS_OP_GETXATTR:
			fsid = op->upcall.req.getxattr.refn.fs_id;
			break;
		case PVFS2_VFS_OP_SETXATTR:
			fsid = op->upcall.req.setxattr.refn.fs_id;
			break;
		case PVFS2_VFS_OP_LISTXATTR:
			fsid = op->upcall.req.listxattr.refn.fs_id;
			break;
		case PVFS2_VFS_OP_REMOVEXATTR:
			fsid = op->upcall.req.removexattr.refn.fs_id;
			break;
		case PVFS2_VFS_OP_FSYNC:
			fsid = op->upcall.req.fsync.refn.fs_id;
			break;
		default:
			break;
		}
	}
	return fsid;
}

static void pvfs2_set_inode_flags(struct inode *inode,
				  struct PVFS_sys_attr_s *attrs)
{
	if (attrs->flags & PVFS_IMMUTABLE_FL)
		inode->i_flags |= S_IMMUTABLE;
	else
		inode->i_flags &= ~S_IMMUTABLE;

	if (attrs->flags & PVFS_APPEND_FL)
		inode->i_flags |= S_APPEND;
	else
		inode->i_flags &= ~S_APPEND;

	if (attrs->flags & PVFS_NOATIME_FL)
		inode->i_flags |= S_NOATIME;
	else
		inode->i_flags &= ~S_NOATIME;

}

/* NOTE: symname is ignored unless the inode is a sym link */
static int copy_attributes_to_inode(struct inode *inode,
				    struct PVFS_sys_attr_s *attrs,
				    char *symname)
{
	int ret = -1;
	int perm_mode = 0;
	struct pvfs2_inode_s *pvfs2_inode = PVFS2_I(inode);
	loff_t inode_size = 0;
	loff_t rounded_up_size = 0;


	/*
	   arbitrarily set the inode block size; FIXME: we need to
	   resolve the difference between the reported inode blocksize
	   and the PAGE_CACHE_SIZE, since our block count will always
	   be wrong.

	   For now, we're setting the block count to be the proper
	   number assuming the block size is 512 bytes, and the size is
	   rounded up to the nearest 4K.  This is apparently required
	   to get proper size reports from the 'du' shell utility.

	   changing the inode->i_blkbits to something other than
	   PAGE_CACHE_SHIFT breaks mmap/execution as we depend on that.
	 */
	gossip_debug(GOSSIP_UTILS_DEBUG,
		     "attrs->mask = %x (objtype = %s)\n",
		     attrs->mask,
		     attrs->objtype == PVFS_TYPE_METAFILE ? "file" :
		     attrs->objtype == PVFS_TYPE_DIRECTORY ? "directory" :
		     attrs->objtype == PVFS_TYPE_SYMLINK ? "symlink" :
			"invalid/unknown");

	switch (attrs->objtype) {
	case PVFS_TYPE_METAFILE:
		pvfs2_set_inode_flags(inode, attrs);
		if (attrs->mask & PVFS_ATTR_SYS_SIZE) {
			inode_size = (loff_t) attrs->size;
			rounded_up_size =
			    (inode_size + (4096 - (inode_size % 4096)));

			pvfs2_lock_inode(inode);
			inode->i_bytes = inode_size;
			inode->i_blocks =
			    (unsigned long)(rounded_up_size / 512);
			pvfs2_unlock_inode(inode);

			/*
			 * NOTE: make sure all the places we're called
			 * from have the inode->i_sem lock. We're fine
			 * in 99% of the cases since we're mostly
			 * called from a lookup.
			 */
			inode->i_size = inode_size;
		}
		break;
	case PVFS_TYPE_SYMLINK:
		if (symname != NULL) {
			inode->i_size = (loff_t) strlen(symname);
			break;
		}
		/*FALLTHRU*/
	default:
		inode->i_size = PAGE_CACHE_SIZE;

		pvfs2_lock_inode(inode);
		inode_set_bytes(inode, inode->i_size);
		pvfs2_unlock_inode(inode);
		break;
	}

	inode->i_uid = make_kuid(&init_user_ns, attrs->owner);
	inode->i_gid = make_kgid(&init_user_ns, attrs->group);
	inode->i_atime.tv_sec = (time_t) attrs->atime;
	inode->i_mtime.tv_sec = (time_t) attrs->mtime;
	inode->i_ctime.tv_sec = (time_t) attrs->ctime;
	inode->i_atime.tv_nsec = 0;
	inode->i_mtime.tv_nsec = 0;
	inode->i_ctime.tv_nsec = 0;

	if (attrs->perms & PVFS_O_EXECUTE)
		perm_mode |= S_IXOTH;
	if (attrs->perms & PVFS_O_WRITE)
		perm_mode |= S_IWOTH;
	if (attrs->perms & PVFS_O_READ)
		perm_mode |= S_IROTH;

	if (attrs->perms & PVFS_G_EXECUTE)
		perm_mode |= S_IXGRP;
	if (attrs->perms & PVFS_G_WRITE)
		perm_mode |= S_IWGRP;
	if (attrs->perms & PVFS_G_READ)
		perm_mode |= S_IRGRP;

	if (attrs->perms & PVFS_U_EXECUTE)
		perm_mode |= S_IXUSR;
	if (attrs->perms & PVFS_U_WRITE)
		perm_mode |= S_IWUSR;
	if (attrs->perms & PVFS_U_READ)
		perm_mode |= S_IRUSR;

	if (attrs->perms & PVFS_G_SGID)
		perm_mode |= S_ISGID;
	if (attrs->perms & PVFS_U_SUID)
		perm_mode |= S_ISUID;

	inode->i_mode = perm_mode;

	if (is_root_handle(inode)) {
		/* special case: mark the root inode as sticky */
		inode->i_mode |= S_ISVTX;
		gossip_debug(GOSSIP_UTILS_DEBUG,
			     "Marking inode %pU as sticky\n",
			     get_khandle_from_ino(inode));
	}

	switch (attrs->objtype) {
	case PVFS_TYPE_METAFILE:
		inode->i_mode |= S_IFREG;
		ret = 0;
		break;
	case PVFS_TYPE_DIRECTORY:
		inode->i_mode |= S_IFDIR;
		/* NOTE: we have no good way to keep nlink consistent
		 * for directories across clients; keep constant at 1.
		 * Why 1?  If we go with 2, then find(1) gets confused
		 * and won't work properly withouth the -noleaf option
		 */
		set_nlink(inode, 1);
		ret = 0;
		break;
	case PVFS_TYPE_SYMLINK:
		inode->i_mode |= S_IFLNK;

		/* copy link target to inode private data */
		if (pvfs2_inode && symname) {
			strncpy(pvfs2_inode->link_target,
				symname,
				PVFS_NAME_MAX);
			gossip_debug(GOSSIP_UTILS_DEBUG,
				     "Copied attr link target %s\n",
				     pvfs2_inode->link_target);
		}
		gossip_debug(GOSSIP_UTILS_DEBUG,
			     "symlink mode %o\n",
			     inode->i_mode);
		ret = 0;
		break;
	default:
		gossip_err("pvfs2: copy_attributes_to_inode: got invalid attribute type %x\n",
			attrs->objtype);
	}

	gossip_debug(GOSSIP_UTILS_DEBUG,
		     "pvfs2: copy_attributes_to_inode: setting i_mode to %o, i_size to %lu\n",
		     inode->i_mode,
		     (unsigned long)i_size_read(inode));

	return ret;
}

/*
 * 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 PVFS_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(current_user_ns(), iattr->ia_uid);
		attrs->mask |= PVFS_ATTR_SYS_UID;
		gossip_debug(GOSSIP_UTILS_DEBUG, "(UID) %d\n", attrs->owner);
	}
	if (iattr->ia_valid & ATTR_GID) {
		attrs->group = from_kgid(current_user_ns(), iattr->ia_gid);
		attrs->mask |= PVFS_ATTR_SYS_GID;
		gossip_debug(GOSSIP_UTILS_DEBUG, "(GID) %d\n", attrs->group);
	}

	if (iattr->ia_valid & ATTR_ATIME) {
		attrs->mask |= PVFS_ATTR_SYS_ATIME;
		if (iattr->ia_valid & ATTR_ATIME_SET) {
			attrs->atime =
			    pvfs2_convert_time_field((void *)&iattr->ia_atime);
			attrs->mask |= PVFS_ATTR_SYS_ATIME_SET;
		}
	}
	if (iattr->ia_valid & ATTR_MTIME) {
		attrs->mask |= PVFS_ATTR_SYS_MTIME;
		if (iattr->ia_valid & ATTR_MTIME_SET) {
			attrs->mtime =
			    pvfs2_convert_time_field((void *)&iattr->ia_mtime);
			attrs->mask |= PVFS_ATTR_SYS_MTIME_SET;
		}
	}
	if (iattr->ia_valid & ATTR_CTIME)
		attrs->mask |= PVFS_ATTR_SYS_CTIME;

	/*
	 * PVFS2 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 = PVFS_util_translate_mode(tmp_mode);
		attrs->mask |= PVFS_ATTR_SYS_PERM;
	}

	return 0;
}

/*
 * issues a pvfs2 getattr request and fills in the appropriate inode
 * attributes if successful.  returns 0 on success; -errno otherwise
 */
int pvfs2_inode_getattr(struct inode *inode, __u32 getattr_mask)
{
	struct pvfs2_inode_s *pvfs2_inode = PVFS2_I(inode);
	struct pvfs2_kernel_op_s *new_op;
	int ret = -EINVAL;

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

	new_op = op_alloc(PVFS2_VFS_OP_GETATTR);
	if (!new_op)
		return -ENOMEM;
	new_op->upcall.req.getattr.refn = pvfs2_inode->refn;
	new_op->upcall.req.getattr.mask = getattr_mask;

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

	if (copy_attributes_to_inode(inode,
			&new_op->downcall.resp.getattr.attributes,
			new_op->downcall.resp.getattr.link_target)) {
		gossip_err("%s: failed to copy attributes\n", __func__);
		ret = -ENOENT;
		goto out;
	}

	/*
	 * Store blksize in pvfs2 specific part of inode structure; we are
	 * only going to use this to report to stat to make sure it doesn't
	 * perturb any inode related code paths.
	 */
	if (new_op->downcall.resp.getattr.attributes.objtype ==
			PVFS_TYPE_METAFILE) {
		pvfs2_inode->blksize =
			new_op->downcall.resp.getattr.attributes.blksize;
	} else {
		/* mimic behavior of generic_fillattr() for other types. */
		pvfs2_inode->blksize = (1 << inode->i_blkbits);

	}

out:
	gossip_debug(GOSSIP_UTILS_DEBUG,
		     "Getattr on handle %pU, "
		     "fsid %d\n  (inode ct = %d) returned %d\n",
		     &pvfs2_inode->refn.khandle,
		     pvfs2_inode->refn.fs_id,
		     (int)atomic_read(&inode->i_count),
		     ret);

	op_release(new_op);
	return ret;
}

/*
 * issues a pvfs2 setattr request to make sure the new attribute values
 * take effect if successful.  returns 0 on success; -errno otherwise
 */
int pvfs2_inode_setattr(struct inode *inode, struct iattr *iattr)
{
	struct pvfs2_inode_s *pvfs2_inode = PVFS2_I(inode);
	struct pvfs2_kernel_op_s *new_op;
	int ret;

	new_op = op_alloc(PVFS2_VFS_OP_SETATTR);
	if (!new_op)
		return -ENOMEM;

	new_op->upcall.req.setattr.refn = pvfs2_inode->refn;
	ret = copy_attributes_from_inode(inode,
		       &new_op->upcall.req.setattr.attributes,
		       iattr);
	if (ret < 0) {
		op_release(new_op);
		return ret;
	}

	ret = service_operation(new_op, __func__,
				get_interruptible_flag(inode));

	gossip_debug(GOSSIP_UTILS_DEBUG,
		     "pvfs2_inode_setattr: returning %d\n",
		     ret);

	/* when request is serviced properly, free req op struct */
	op_release(new_op);

	/*
	 * successful setattr should clear the atime, mtime and
	 * ctime flags.
	 */
	if (ret == 0) {
		ClearAtimeFlag(pvfs2_inode);
		ClearMtimeFlag(pvfs2_inode);
		ClearCtimeFlag(pvfs2_inode);
		ClearModeFlag(pvfs2_inode);
	}

	return ret;
}

int pvfs2_flush_inode(struct inode *inode)
{
	/*
	 * If it is a dirty inode, this function gets called.
	 * Gather all the information that needs to be setattr'ed
	 * Right now, this will only be used for mode, atime, mtime
	 * and/or ctime.
	 */
	struct iattr wbattr;
	int ret;
	int mtime_flag;
	int ctime_flag;
	int atime_flag;
	int mode_flag;
	struct pvfs2_inode_s *pvfs2_inode = PVFS2_I(inode);

	memset(&wbattr, 0, sizeof(wbattr));

	/*
	 * check inode flags up front, and clear them if they are set.  This
	 * will prevent multiple processes from all trying to flush the same
	 * inode if they call close() simultaneously
	 */
	mtime_flag = MtimeFlag(pvfs2_inode);
	ClearMtimeFlag(pvfs2_inode);
	ctime_flag = CtimeFlag(pvfs2_inode);
	ClearCtimeFlag(pvfs2_inode);
	atime_flag = AtimeFlag(pvfs2_inode);
	ClearAtimeFlag(pvfs2_inode);
	mode_flag = ModeFlag(pvfs2_inode);
	ClearModeFlag(pvfs2_inode);

	/*  -- Lazy atime,mtime and ctime update --
	 * Note: all times are dictated by server in the new scheme
	 * and not by the clients
	 *
	 * Also mode updates are being handled now..
	 */

	if (mtime_flag)
		wbattr.ia_valid |= ATTR_MTIME;
	if (ctime_flag)
		wbattr.ia_valid |= ATTR_CTIME;
	if (atime_flag)
		wbattr.ia_valid |= ATTR_ATIME;

	if (mode_flag) {
		wbattr.ia_mode = inode->i_mode;
		wbattr.ia_valid |= ATTR_MODE;
	}

	gossip_debug(GOSSIP_UTILS_DEBUG,
		     "*********** pvfs2_flush_inode: %pU "
		     "(ia_valid %d)\n",
		     get_khandle_from_ino(inode),
		     wbattr.ia_valid);
	if (wbattr.ia_valid == 0) {
		gossip_debug(GOSSIP_UTILS_DEBUG,
			     "pvfs2_flush_inode skipping setattr()\n");
		return 0;
	}

	gossip_debug(GOSSIP_UTILS_DEBUG,
		     "pvfs2_flush_inode (%pU) writing mode %o\n",
		     get_khandle_from_ino(inode),
		     inode->i_mode);

	ret = pvfs2_inode_setattr(inode, &wbattr);

	return ret;
}

int pvfs2_unmount_sb(struct super_block *sb)
{
	int ret = -EINVAL;
	struct pvfs2_kernel_op_s *new_op = NULL;

	gossip_debug(GOSSIP_UTILS_DEBUG,
		     "pvfs2_unmount_sb called on sb %p\n",
		     sb);

	new_op = op_alloc(PVFS2_VFS_OP_FS_UMOUNT);
	if (!new_op)
		return -ENOMEM;
	new_op->upcall.req.fs_umount.id = PVFS2_SB(sb)->id;
	new_op->upcall.req.fs_umount.fs_id = PVFS2_SB(sb)->fs_id;
	strncpy(new_op->upcall.req.fs_umount.pvfs2_config_server,
		PVFS2_SB(sb)->devname,
		PVFS_MAX_SERVER_ADDR_LEN);

	gossip_debug(GOSSIP_UTILS_DEBUG,
		     "Attempting PVFS2 Unmount via host %s\n",
		     new_op->upcall.req.fs_umount.pvfs2_config_server);

	ret = service_operation(new_op, "pvfs2_fs_umount", 0);

	gossip_debug(GOSSIP_UTILS_DEBUG,
		     "pvfs2_unmount: got return value of %d\n", ret);
	if (ret)
		sb = ERR_PTR(ret);
	else
		PVFS2_SB(sb)->mount_pending = 1;

	op_release(new_op);
	return ret;
}

/*
 * NOTE: on successful cancellation, be sure to return -EINTR, as
 * that's the return value the caller expects
 */
int pvfs2_cancel_op_in_progress(__u64 tag)
{
	int ret = -EINVAL;
	struct pvfs2_kernel_op_s *new_op = NULL;

	gossip_debug(GOSSIP_UTILS_DEBUG,
		     "pvfs2_cancel_op_in_progress called on tag %llu\n",
		     llu(tag));

	new_op = op_alloc(PVFS2_VFS_OP_CANCEL);
	if (!new_op)
		return -ENOMEM;
	new_op->upcall.req.cancel.op_tag = tag;

	gossip_debug(GOSSIP_UTILS_DEBUG,
		     "Attempting PVFS2 operation cancellation of tag %llu\n",
		     llu(new_op->upcall.req.cancel.op_tag));

	ret = service_operation(new_op, "pvfs2_cancel", PVFS2_OP_CANCELLATION);

	gossip_debug(GOSSIP_UTILS_DEBUG,
		     "pvfs2_cancel_op_in_progress: got return value of %d\n",
		     ret);

	op_release(new_op);
	return ret;
}

void pvfs2_op_initialize(struct pvfs2_kernel_op_s *op)
{
	if (op) {
		spin_lock(&op->lock);
		op->io_completed = 0;

		op->upcall.type = PVFS2_VFS_OP_INVALID;
		op->downcall.type = PVFS2_VFS_OP_INVALID;
		op->downcall.status = -1;

		op->op_state = OP_VFS_STATE_UNKNOWN;
		op->tag = 0;
		spin_unlock(&op->lock);
	}
}

void pvfs2_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);
	}
}

/* Block all blockable signals... */
void block_signals(sigset_t *orig_sigset)
{
	sigset_t mask;

	/*
	 * Initialize all entries in the signal set to the
	 * inverse of the given mask.
	 */
	siginitsetinv(&mask, sigmask(SIGKILL));

	/* Block 'em Danno... */
	sigprocmask(SIG_BLOCK, &mask, orig_sigset);
}

/* set the signal mask to the given template... */
void set_signals(sigset_t *sigset)
{
	sigprocmask(SIG_SETMASK, sigset, NULL);
}

__u64 pvfs2_convert_time_field(void *time_ptr)
{
	__u64 pvfs2_time;
	struct timespec *tspec = (struct timespec *)time_ptr;

	pvfs2_time = (__u64) ((time_t) tspec->tv_sec);
	return pvfs2_time;
}

/* The following is a very dirty hack that is now a permanent part of the
 * PVFS2 protocol. See protocol.h for more error definitions. */

/* The order matches include/pvfs2-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 pvfs2_normalize_to_errno(__s32 error_code)
{
	/* 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("pvfs2: error status receieved.\n");
		gossip_err("pvfs2: assuming error code is inverted.\n");
		error_code = -error_code;
	}

	/* XXX: This is very bad since error codes from PVFS2 may not be
	 * suitable for return into userspace. */

	/* Convert PVFS2 error values into errno values suitable for return
	 * from the kernel. */
	if ((-error_code) & PVFS_NON_ERRNO_ERROR_BIT) {
		if (((-error_code) &
		    (PVFS_ERROR_NUMBER_BITS|PVFS_NON_ERRNO_ERROR_BIT|
		    PVFS_ERROR_BIT)) == PVFS_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("pvfs2: warning: got error code without "
			    "errno equivalent: %d.\n", error_code);
			error_code = -EINVAL;
		}

	/* Convert PVFS2 encoded errno values into regular errno values. */
	} else if ((-error_code) & PVFS_ERROR_BIT) {
		__u32 i;
		i = (-error_code) & ~(PVFS_ERROR_BIT|PVFS_ERROR_CLASS_BITS);
		if (i < sizeof PINT_errno_mapping/sizeof *PINT_errno_mapping)
			error_code = -PINT_errno_mapping[i];
		else
			error_code = -EINVAL;

	/* Only PVFS2 protocol error codes should ever come here. Otherwise
	 * there is a bug somewhere. */
	} else {
		gossip_err("pvfs2: pvfs2_normalize_to_errno: got error code"
		    "which is not from PVFS2.\n");
	}
	return error_code;
}

#define NUM_MODES 11
__s32 PVFS_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 pvfs2_modes[NUM_MODES] = {
		PVFS_O_EXECUTE, PVFS_O_WRITE, PVFS_O_READ,
		PVFS_G_EXECUTE, PVFS_G_WRITE, PVFS_G_READ,
		PVFS_U_EXECUTE, PVFS_U_WRITE, PVFS_U_READ,
		PVFS_G_SGID, PVFS_U_SUID
	};

	for (i = 0; i < NUM_MODES; i++)
		if (mode & modes[i])
			ret |= pvfs2_modes[i];

	return ret;
}
#undef NUM_MODES

/*
 * After obtaining a string representation of the client's debug
 * keywords and their associated masks, this function is called to build an
 * array of these values.
 */
int orangefs_prepare_cdm_array(char *debug_array_string)
{
	int i;
	int rc = -EINVAL;
	char *cds_head = NULL;
	char *cds_delimiter = NULL;
	int keyword_len = 0;

	gossip_debug(GOSSIP_UTILS_DEBUG, "%s: start\n", __func__);

	/*
	 * figure out how many elements the cdm_array needs.
	 */
	for (i = 0; i < strlen(debug_array_string); i++)
		if (debug_array_string[i] == '\n')
			cdm_element_count++;

	if (!cdm_element_count) {
		pr_info("No elements in client debug array string!\n");
		goto out;
	}

	cdm_array =
		kzalloc(cdm_element_count * sizeof(struct client_debug_mask),
			GFP_KERNEL);
	if (!cdm_array) {
		pr_info("malloc failed for cdm_array!\n");
		rc = -ENOMEM;
		goto out;
	}

	cds_head = debug_array_string;

	for (i = 0; i < cdm_element_count; i++) {
		cds_delimiter = strchr(cds_head, '\n');
		*cds_delimiter = '\0';

		keyword_len = strcspn(cds_head, " ");

		cdm_array[i].keyword = kzalloc(keyword_len + 1, GFP_KERNEL);
		if (!cdm_array[i].keyword) {
			rc = -ENOMEM;
			goto out;
		}

		sscanf(cds_head,
		       "%s %llx %llx",
		       cdm_array[i].keyword,
		       (unsigned long long *)&(cdm_array[i].mask1),
		       (unsigned long long *)&(cdm_array[i].mask2));

		if (!strcmp(cdm_array[i].keyword, PVFS2_VERBOSE))
			client_verbose_index = i;

		if (!strcmp(cdm_array[i].keyword, PVFS2_ALL))
			client_all_index = i;

		cds_head = cds_delimiter + 1;
	}

	rc = cdm_element_count;

	gossip_debug(GOSSIP_UTILS_DEBUG, "%s: rc:%d:\n", __func__, rc);

out:

	return rc;

}

/*
 * /sys/kernel/debug/orangefs/debug-help can be catted to
 * see all the available kernel and client debug keywords.
 *
 * When the kernel boots, we have no idea what keywords the
 * client supports, nor their associated masks.
 *
 * We pass through this function once at boot and stamp a
 * boilerplate "we don't know" message for the client in the
 * debug-help file. We pass through here again when the client
 * starts and then we can fill out the debug-help file fully.
 *
 * The client might be restarted any number of times between
 * reboots, we only build the debug-help file the first time.
 */
int orangefs_prepare_debugfs_help_string(int at_boot)
{
	int rc = -EINVAL;
	int i;
	int byte_count = 0;
	char *client_title = "Client Debug Keywords:\n";
	char *kernel_title = "Kernel Debug Keywords:\n";

	gossip_debug(GOSSIP_UTILS_DEBUG, "%s: start\n", __func__);

	if (at_boot) {
		byte_count += strlen(HELP_STRING_UNINITIALIZED);
		client_title = HELP_STRING_UNINITIALIZED;
	} else {
		/*
		 * fill the client keyword/mask array and remember
		 * how many elements there were.
		 */
		cdm_element_count =
			orangefs_prepare_cdm_array(client_debug_array_string);
		if (cdm_element_count <= 0)
			goto out;

		/* Count the bytes destined for debug_help_string. */
		byte_count += strlen(client_title);

		for (i = 0; i < cdm_element_count; i++) {
			byte_count += strlen(cdm_array[i].keyword + 2);
			if (byte_count >= DEBUG_HELP_STRING_SIZE) {
				pr_info("%s: overflow 1!\n", __func__);
				goto out;
			}
		}

		gossip_debug(GOSSIP_UTILS_DEBUG,
			     "%s: cdm_element_count:%d:\n",
			     __func__,
			     cdm_element_count);
	}

	byte_count += strlen(kernel_title);
	for (i = 0; i < num_kmod_keyword_mask_map; i++) {
		byte_count +=
			strlen(s_kmod_keyword_mask_map[i].keyword + 2);
		if (byte_count >= DEBUG_HELP_STRING_SIZE) {
			pr_info("%s: overflow 2!\n", __func__);
			goto out;
		}
	}

	/* build debug_help_string. */
	debug_help_string = kzalloc(DEBUG_HELP_STRING_SIZE, GFP_KERNEL);
	if (!debug_help_string) {
		rc = -ENOMEM;
		goto out;
	}

	strcat(debug_help_string, client_title);

	if (!at_boot) {
		for (i = 0; i < cdm_element_count; i++) {
			strcat(debug_help_string, "\t");
			strcat(debug_help_string, cdm_array[i].keyword);
			strcat(debug_help_string, "\n");
		}
	}

	strcat(debug_help_string, "\n");
	strcat(debug_help_string, kernel_title);

	for (i = 0; i < num_kmod_keyword_mask_map; i++) {
		strcat(debug_help_string, "\t");
		strcat(debug_help_string, s_kmod_keyword_mask_map[i].keyword);
		strcat(debug_help_string, "\n");
	}

	rc = 0;

out:

	return rc;

}

/*
 * kernel = type 0
 * client = type 1
 */
void debug_mask_to_string(void *mask, int type)
{
	int i;
	int len = 0;
	char *debug_string;
	int element_count = 0;

	gossip_debug(GOSSIP_UTILS_DEBUG, "%s: start\n", __func__);

	if (type) {
		debug_string = client_debug_string;
		element_count = cdm_element_count;
	} else {
		debug_string = kernel_debug_string;
		element_count = num_kmod_keyword_mask_map;
	}

	memset(debug_string, 0, PVFS2_MAX_DEBUG_STRING_LEN);

	/*
	 * Some keywords, like "all" or "verbose", are amalgams of
	 * numerous other keywords. Make a special check for those
	 * before grinding through the whole mask only to find out
	 * later...
	 */
	if (check_amalgam_keyword(mask, type))
		goto out;

	/* Build the debug string. */
	for (i = 0; i < element_count; i++)
		if (type)
			do_c_string(mask, i);
		else
			do_k_string(mask, i);

	len = strlen(debug_string);

	if ((len) && (type))
		client_debug_string[len - 1] = '\0';
	else if (len)
		kernel_debug_string[len - 1] = '\0';
	else if (type)
		strcpy(client_debug_string, "none");
	else
		strcpy(kernel_debug_string, "none");

out:
gossip_debug(GOSSIP_UTILS_DEBUG, "%s: string:%s:\n", __func__, debug_string);

	return;

}

void do_k_string(void *k_mask, int index)
{
	__u64 *mask = (__u64 *) k_mask;

	if (keyword_is_amalgam((char *) s_kmod_keyword_mask_map[index].keyword))
			goto out;

	if (*mask & s_kmod_keyword_mask_map[index].mask_val) {
		if ((strlen(kernel_debug_string) +
		     strlen(s_kmod_keyword_mask_map[index].keyword))
			< PVFS2_MAX_DEBUG_STRING_LEN - 1) {
				strcat(kernel_debug_string,
				       s_kmod_keyword_mask_map[index].keyword);
				strcat(kernel_debug_string, ",");
			} else {
				gossip_err("%s: overflow!\n", __func__);
				strcpy(kernel_debug_string, PVFS2_ALL);
				goto out;
			}
	}

out:

	return;
}

void do_c_string(void *c_mask, int index)
{
	struct client_debug_mask *mask = (struct client_debug_mask *) c_mask;

	if (keyword_is_amalgam(cdm_array[index].keyword))
		goto out;

	if ((mask->mask1 & cdm_array[index].mask1) ||
	    (mask->mask2 & cdm_array[index].mask2)) {
		if ((strlen(client_debug_string) +
		     strlen(cdm_array[index].keyword) + 1)
			< PVFS2_MAX_DEBUG_STRING_LEN - 2) {
				strcat(client_debug_string,
				       cdm_array[index].keyword);
				strcat(client_debug_string, ",");
			} else {
				gossip_err("%s: overflow!\n", __func__);
				strcpy(client_debug_string, PVFS2_ALL);
				goto out;
			}
	}
out:
	return;
}

int keyword_is_amalgam(char *keyword)
{
	int rc = 0;

	if ((!strcmp(keyword, PVFS2_ALL)) || (!strcmp(keyword, PVFS2_VERBOSE)))
		rc = 1;

	return rc;
}

/*
 * kernel = type 0
 * client = type 1
 *
 * return 1 if we found an amalgam.
 */
int check_amalgam_keyword(void *mask, int type)
{
	__u64 *k_mask;
	struct client_debug_mask *c_mask;
	int k_all_index = num_kmod_keyword_mask_map - 1;
	int rc = 0;

	if (type) {
		c_mask = (struct client_debug_mask *) mask;

		if ((c_mask->mask1 == cdm_array[client_all_index].mask1) &&
		    (c_mask->mask2 == cdm_array[client_all_index].mask2)) {
			strcpy(client_debug_string, PVFS2_ALL);
			rc = 1;
			goto out;
		}

		if ((c_mask->mask1 == cdm_array[client_verbose_index].mask1) &&
		    (c_mask->mask2 == cdm_array[client_verbose_index].mask2)) {
			strcpy(client_debug_string, PVFS2_VERBOSE);
			rc = 1;
			goto out;
		}

	} else {
		k_mask = (__u64 *) mask;

		if (*k_mask >= s_kmod_keyword_mask_map[k_all_index].mask_val) {
			strcpy(kernel_debug_string, PVFS2_ALL);
			rc = 1;
			goto out;
		}
	}

out:

	return rc;
}

/*
 * kernel = type 0
 * client = type 1
 */
void debug_string_to_mask(char *debug_string, void *mask, int type)
{
	char *unchecked_keyword;
	int i;
	char *strsep_fodder = kstrdup(debug_string, GFP_KERNEL);
	char *original_pointer;
	int element_count = 0;
	struct client_debug_mask *c_mask;
	__u64 *k_mask;

	gossip_debug(GOSSIP_UTILS_DEBUG, "%s: start\n", __func__);

	if (type) {
		c_mask = (struct client_debug_mask *)mask;
		element_count = cdm_element_count;
	} else {
		k_mask = (__u64 *)mask;
		*k_mask = 0;
		element_count = num_kmod_keyword_mask_map;
	}

	original_pointer = strsep_fodder;
	while ((unchecked_keyword = strsep(&strsep_fodder, ",")))
		if (strlen(unchecked_keyword)) {
			for (i = 0; i < element_count; i++)
				if (type)
					do_c_mask(i,
						  unchecked_keyword,
						  &c_mask);
				else
					do_k_mask(i,
						  unchecked_keyword,
						  &k_mask);
		}

	kfree(original_pointer);
}

void do_c_mask(int i,
	       char *unchecked_keyword,
	       struct client_debug_mask **sane_mask)
{

	if (!strcmp(cdm_array[i].keyword, unchecked_keyword)) {
		(**sane_mask).mask1 = (**sane_mask).mask1 | cdm_array[i].mask1;
		(**sane_mask).mask2 = (**sane_mask).mask2 | cdm_array[i].mask2;
	}
}

void do_k_mask(int i, char *unchecked_keyword, __u64 **sane_mask)
{

	if (!strcmp(s_kmod_keyword_mask_map[i].keyword, unchecked_keyword))
		**sane_mask = (**sane_mask) |
				s_kmod_keyword_mask_map[i].mask_val;
}