1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright (c) 2011 Gunnar Beutner 23 * Copyright (c) 2012 Cyril Plisko. All rights reserved. 24 */ 25 26 27 #include <sys/zfs_znode.h> 28 #include <sys/zfs_vnops.h> 29 #include <sys/zfs_ctldir.h> 30 #include <sys/zpl.h> 31 32 33 static int 34 #ifdef HAVE_ENCODE_FH_WITH_INODE 35 zpl_encode_fh(struct inode *ip, __u32 *fh, int *max_len, struct inode *parent) 36 { 37 #else 38 zpl_encode_fh(struct dentry *dentry, __u32 *fh, int *max_len, int connectable) 39 { 40 /* CSTYLED */ 41 struct inode *ip = dentry->d_inode; 42 #endif /* HAVE_ENCODE_FH_WITH_INODE */ 43 fstrans_cookie_t cookie; 44 ushort_t empty_fid = 0; 45 fid_t *fid; 46 int len_bytes, rc; 47 48 len_bytes = *max_len * sizeof (__u32); 49 50 if (len_bytes < offsetof(fid_t, fid_data)) { 51 fid = (fid_t *)&empty_fid; 52 } else { 53 fid = (fid_t *)fh; 54 fid->fid_len = len_bytes - offsetof(fid_t, fid_data); 55 } 56 57 cookie = spl_fstrans_mark(); 58 59 if (zfsctl_is_node(ip)) 60 rc = zfsctl_fid(ip, fid); 61 else 62 rc = zfs_fid(ip, fid); 63 64 spl_fstrans_unmark(cookie); 65 len_bytes = offsetof(fid_t, fid_data) + fid->fid_len; 66 *max_len = roundup(len_bytes, sizeof (__u32)) / sizeof (__u32); 67 68 return (rc == 0 ? FILEID_INO32_GEN : 255); 69 } 70 71 static struct dentry * 72 zpl_fh_to_dentry(struct super_block *sb, struct fid *fh, 73 int fh_len, int fh_type) 74 { 75 fid_t *fid = (fid_t *)fh; 76 fstrans_cookie_t cookie; 77 struct inode *ip; 78 int len_bytes, rc; 79 80 len_bytes = fh_len * sizeof (__u32); 81 82 if (fh_type != FILEID_INO32_GEN || 83 len_bytes < offsetof(fid_t, fid_data) || 84 len_bytes < offsetof(fid_t, fid_data) + fid->fid_len) 85 return (ERR_PTR(-EINVAL)); 86 87 cookie = spl_fstrans_mark(); 88 rc = zfs_vget(sb, &ip, fid); 89 spl_fstrans_unmark(cookie); 90 91 if (rc) { 92 /* 93 * If we see ENOENT it might mean that an NFSv4 * client 94 * is using a cached inode value in a file handle and 95 * that the sought after file has had its inode changed 96 * by a third party. So change the error to ESTALE 97 * which will trigger a full lookup by the client and 98 * will find the new filename/inode pair if it still 99 * exists. 100 */ 101 if (rc == ENOENT) 102 rc = ESTALE; 103 104 return (ERR_PTR(-rc)); 105 } 106 107 ASSERT((ip != NULL) && !IS_ERR(ip)); 108 109 return (d_obtain_alias(ip)); 110 } 111 112 static struct dentry * 113 zpl_get_parent(struct dentry *child) 114 { 115 cred_t *cr = CRED(); 116 fstrans_cookie_t cookie; 117 znode_t *zp; 118 int error; 119 120 crhold(cr); 121 cookie = spl_fstrans_mark(); 122 error = -zfs_lookup(ITOZ(child->d_inode), "..", &zp, 0, cr, NULL, NULL); 123 spl_fstrans_unmark(cookie); 124 crfree(cr); 125 ASSERT3S(error, <=, 0); 126 127 if (error) 128 return (ERR_PTR(error)); 129 130 return (d_obtain_alias(ZTOI(zp))); 131 } 132 133 static int 134 zpl_commit_metadata(struct inode *inode) 135 { 136 cred_t *cr = CRED(); 137 fstrans_cookie_t cookie; 138 int error; 139 140 if (zfsctl_is_node(inode)) 141 return (0); 142 143 crhold(cr); 144 cookie = spl_fstrans_mark(); 145 error = -zfs_fsync(ITOZ(inode), 0, cr); 146 spl_fstrans_unmark(cookie); 147 crfree(cr); 148 ASSERT3S(error, <=, 0); 149 150 return (error); 151 } 152 153 const struct export_operations zpl_export_operations = { 154 .encode_fh = zpl_encode_fh, 155 .fh_to_dentry = zpl_fh_to_dentry, 156 .get_parent = zpl_get_parent, 157 .commit_metadata = zpl_commit_metadata, 158 }; 159