/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright (c) 2011 Gunnar Beutner * Copyright (c) 2012 Cyril Plisko. All rights reserved. */ #include <sys/zfs_vnops.h> #include <sys/zfs_znode.h> #include <sys/zfs_ctldir.h> #include <sys/zpl.h> static int #ifdef HAVE_ENCODE_FH_WITH_INODE zpl_encode_fh(struct inode *ip, __u32 *fh, int *max_len, struct inode *parent) { #else zpl_encode_fh(struct dentry *dentry, __u32 *fh, int *max_len, int connectable) { /* CSTYLED */ struct inode *ip = dentry->d_inode; #endif /* HAVE_ENCODE_FH_WITH_INODE */ fstrans_cookie_t cookie; fid_t *fid = (fid_t *)fh; int len_bytes, rc; len_bytes = *max_len * sizeof (__u32); if (len_bytes < offsetof(fid_t, fid_data)) return (255); fid->fid_len = len_bytes - offsetof(fid_t, fid_data); cookie = spl_fstrans_mark(); if (zfsctl_is_node(ip)) rc = zfsctl_fid(ip, fid); else rc = zfs_fid(ip, fid); spl_fstrans_unmark(cookie); len_bytes = offsetof(fid_t, fid_data) + fid->fid_len; *max_len = roundup(len_bytes, sizeof (__u32)) / sizeof (__u32); return (rc == 0 ? FILEID_INO32_GEN : 255); } static struct dentry * zpl_dentry_obtain_alias(struct inode *ip) { struct dentry *result; #ifdef HAVE_D_OBTAIN_ALIAS result = d_obtain_alias(ip); #else result = d_alloc_anon(ip); if (result == NULL) { iput(ip); result = ERR_PTR(-ENOMEM); } #endif /* HAVE_D_OBTAIN_ALIAS */ return (result); } static struct dentry * zpl_fh_to_dentry(struct super_block *sb, struct fid *fh, int fh_len, int fh_type) { fid_t *fid = (fid_t *)fh; fstrans_cookie_t cookie; struct inode *ip; int len_bytes, rc; len_bytes = fh_len * sizeof (__u32); if (fh_type != FILEID_INO32_GEN || len_bytes < offsetof(fid_t, fid_data) || len_bytes < offsetof(fid_t, fid_data) + fid->fid_len) return (ERR_PTR(-EINVAL)); cookie = spl_fstrans_mark(); rc = zfs_vget(sb, &ip, fid); spl_fstrans_unmark(cookie); if (rc) { /* * If we see ENOENT it might mean that an NFSv4 * client * is using a cached inode value in a file handle and * that the sought after file has had its inode changed * by a third party. So change the error to ESTALE * which will trigger a full lookup by the client and * will find the new filename/inode pair if it still * exists. */ if (rc == ENOENT) rc = ESTALE; return (ERR_PTR(-rc)); } ASSERT((ip != NULL) && !IS_ERR(ip)); return (zpl_dentry_obtain_alias(ip)); } static struct dentry * zpl_get_parent(struct dentry *child) { cred_t *cr = CRED(); fstrans_cookie_t cookie; struct inode *ip; int error; crhold(cr); cookie = spl_fstrans_mark(); error = -zfs_lookup(child->d_inode, "..", &ip, 0, cr, NULL, NULL); spl_fstrans_unmark(cookie); crfree(cr); ASSERT3S(error, <=, 0); if (error) return (ERR_PTR(error)); return (zpl_dentry_obtain_alias(ip)); } #ifdef HAVE_COMMIT_METADATA static int zpl_commit_metadata(struct inode *inode) { cred_t *cr = CRED(); fstrans_cookie_t cookie; int error; if (zfsctl_is_node(inode)) return (0); crhold(cr); cookie = spl_fstrans_mark(); error = -zfs_fsync(inode, 0, cr); spl_fstrans_unmark(cookie); crfree(cr); ASSERT3S(error, <=, 0); return (error); } #endif /* HAVE_COMMIT_METADATA */ const struct export_operations zpl_export_operations = { .encode_fh = zpl_encode_fh, .fh_to_dentry = zpl_fh_to_dentry, .get_parent = zpl_get_parent, #ifdef HAVE_COMMIT_METADATA .commit_metadata = zpl_commit_metadata, #endif /* HAVE_COMMIT_METADATA */ };