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 fid_t *fid = (fid_t *)fh; 45 int len_bytes, rc; 46 47 len_bytes = *max_len * sizeof (__u32); 48 49 if (len_bytes < offsetof(fid_t, fid_data)) 50 return (255); 51 52 fid->fid_len = len_bytes - offsetof(fid_t, fid_data); 53 cookie = spl_fstrans_mark(); 54 55 if (zfsctl_is_node(ip)) 56 rc = zfsctl_fid(ip, fid); 57 else 58 rc = zfs_fid(ip, fid); 59 60 spl_fstrans_unmark(cookie); 61 len_bytes = offsetof(fid_t, fid_data) + fid->fid_len; 62 *max_len = roundup(len_bytes, sizeof (__u32)) / sizeof (__u32); 63 64 return (rc == 0 ? FILEID_INO32_GEN : 255); 65 } 66 67 static struct dentry * 68 zpl_fh_to_dentry(struct super_block *sb, struct fid *fh, 69 int fh_len, int fh_type) 70 { 71 fid_t *fid = (fid_t *)fh; 72 fstrans_cookie_t cookie; 73 struct inode *ip; 74 int len_bytes, rc; 75 76 len_bytes = fh_len * sizeof (__u32); 77 78 if (fh_type != FILEID_INO32_GEN || 79 len_bytes < offsetof(fid_t, fid_data) || 80 len_bytes < offsetof(fid_t, fid_data) + fid->fid_len) 81 return (ERR_PTR(-EINVAL)); 82 83 cookie = spl_fstrans_mark(); 84 rc = zfs_vget(sb, &ip, fid); 85 spl_fstrans_unmark(cookie); 86 87 if (rc) { 88 /* 89 * If we see ENOENT it might mean that an NFSv4 * client 90 * is using a cached inode value in a file handle and 91 * that the sought after file has had its inode changed 92 * by a third party. So change the error to ESTALE 93 * which will trigger a full lookup by the client and 94 * will find the new filename/inode pair if it still 95 * exists. 96 */ 97 if (rc == ENOENT) 98 rc = ESTALE; 99 100 return (ERR_PTR(-rc)); 101 } 102 103 ASSERT((ip != NULL) && !IS_ERR(ip)); 104 105 return (d_obtain_alias(ip)); 106 } 107 108 static struct dentry * 109 zpl_get_parent(struct dentry *child) 110 { 111 cred_t *cr = CRED(); 112 fstrans_cookie_t cookie; 113 znode_t *zp; 114 int error; 115 116 crhold(cr); 117 cookie = spl_fstrans_mark(); 118 error = -zfs_lookup(ITOZ(child->d_inode), "..", &zp, 0, cr, NULL, NULL); 119 spl_fstrans_unmark(cookie); 120 crfree(cr); 121 ASSERT3S(error, <=, 0); 122 123 if (error) 124 return (ERR_PTR(error)); 125 126 return (d_obtain_alias(ZTOI(zp))); 127 } 128 129 static int 130 zpl_commit_metadata(struct inode *inode) 131 { 132 cred_t *cr = CRED(); 133 fstrans_cookie_t cookie; 134 int error; 135 136 if (zfsctl_is_node(inode)) 137 return (0); 138 139 crhold(cr); 140 cookie = spl_fstrans_mark(); 141 error = -zfs_fsync(ITOZ(inode), 0, cr); 142 spl_fstrans_unmark(cookie); 143 crfree(cr); 144 ASSERT3S(error, <=, 0); 145 146 return (error); 147 } 148 149 const struct export_operations zpl_export_operations = { 150 .encode_fh = zpl_encode_fh, 151 .fh_to_dentry = zpl_fh_to_dentry, 152 .get_parent = zpl_get_parent, 153 .commit_metadata = zpl_commit_metadata, 154 }; 155