Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1 | /* -*- mode: c; c-basic-offset: 8; -*- |
| 2 | * vim: noexpandtab sw=8 ts=8 sts=0: |
| 3 | * |
| 4 | * export.c |
| 5 | * |
| 6 | * Functions to facilitate NFS exporting |
| 7 | * |
| 8 | * Copyright (C) 2002, 2005 Oracle. All rights reserved. |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public |
| 12 | * License as published by the Free Software Foundation; either |
| 13 | * version 2 of the License, or (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 18 | * General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public |
| 21 | * License along with this program; if not, write to the |
| 22 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 23 | * Boston, MA 021110-1307, USA. |
| 24 | */ |
| 25 | |
| 26 | #include <linux/fs.h> |
| 27 | #include <linux/types.h> |
| 28 | |
| 29 | #define MLOG_MASK_PREFIX ML_EXPORT |
| 30 | #include <cluster/masklog.h> |
| 31 | |
| 32 | #include "ocfs2.h" |
| 33 | |
| 34 | #include "dir.h" |
| 35 | #include "dlmglue.h" |
Mark Fasheh | 379dfe9 | 2006-09-08 14:21:03 -0700 | [diff] [blame] | 36 | #include "dcache.h" |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 37 | #include "export.h" |
| 38 | #include "inode.h" |
| 39 | |
| 40 | #include "buffer_head_io.h" |
| 41 | |
| 42 | struct ocfs2_inode_handle |
| 43 | { |
| 44 | u64 ih_blkno; |
| 45 | u32 ih_generation; |
| 46 | }; |
| 47 | |
Christoph Hellwig | 644f9ab | 2007-10-21 16:42:15 -0700 | [diff] [blame] | 48 | static struct dentry *ocfs2_get_dentry(struct super_block *sb, |
| 49 | struct ocfs2_inode_handle *handle) |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 50 | { |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 51 | struct inode *inode; |
| 52 | struct dentry *result; |
| 53 | |
| 54 | mlog_entry("(0x%p, 0x%p)\n", sb, handle); |
| 55 | |
| 56 | if (handle->ih_blkno == 0) { |
| 57 | mlog_errno(-ESTALE); |
| 58 | return ERR_PTR(-ESTALE); |
| 59 | } |
| 60 | |
Mark Fasheh | 24c19ef | 2006-09-22 17:28:19 -0700 | [diff] [blame] | 61 | inode = ocfs2_iget(OCFS2_SB(sb), handle->ih_blkno, 0); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 62 | |
Mark Fasheh | 6a1bd4a | 2007-01-03 17:06:59 -0800 | [diff] [blame] | 63 | if (IS_ERR(inode)) |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 64 | return (void *)inode; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 65 | |
| 66 | if (handle->ih_generation != inode->i_generation) { |
| 67 | iput(inode); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 68 | return ERR_PTR(-ESTALE); |
| 69 | } |
| 70 | |
| 71 | result = d_alloc_anon(inode); |
| 72 | |
| 73 | if (!result) { |
| 74 | iput(inode); |
| 75 | mlog_errno(-ENOMEM); |
| 76 | return ERR_PTR(-ENOMEM); |
| 77 | } |
Mark Fasheh | 379dfe9 | 2006-09-08 14:21:03 -0700 | [diff] [blame] | 78 | result->d_op = &ocfs2_dentry_ops; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 79 | |
| 80 | mlog_exit_ptr(result); |
| 81 | return result; |
| 82 | } |
| 83 | |
| 84 | static struct dentry *ocfs2_get_parent(struct dentry *child) |
| 85 | { |
| 86 | int status; |
| 87 | u64 blkno; |
| 88 | struct dentry *parent; |
| 89 | struct inode *inode; |
| 90 | struct inode *dir = child->d_inode; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 91 | |
| 92 | mlog_entry("(0x%p, '%.*s')\n", child, |
| 93 | child->d_name.len, child->d_name.name); |
| 94 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 95 | mlog(0, "find parent of directory %llu\n", |
| 96 | (unsigned long long)OCFS2_I(dir)->ip_blkno); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 97 | |
Mark Fasheh | 4bcec18 | 2006-10-09 16:02:40 -0700 | [diff] [blame] | 98 | status = ocfs2_meta_lock(dir, NULL, 0); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 99 | if (status < 0) { |
| 100 | if (status != -ENOENT) |
| 101 | mlog_errno(status); |
| 102 | parent = ERR_PTR(status); |
| 103 | goto bail; |
| 104 | } |
| 105 | |
Mark Fasheh | be94d11 | 2007-09-11 15:22:06 -0700 | [diff] [blame] | 106 | status = ocfs2_lookup_ino_from_name(dir, "..", 2, &blkno); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 107 | if (status < 0) { |
| 108 | parent = ERR_PTR(-ENOENT); |
| 109 | goto bail_unlock; |
| 110 | } |
| 111 | |
Mark Fasheh | 24c19ef | 2006-09-22 17:28:19 -0700 | [diff] [blame] | 112 | inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 113 | if (IS_ERR(inode)) { |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 114 | mlog(ML_ERROR, "Unable to create inode %llu\n", |
| 115 | (unsigned long long)blkno); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 116 | parent = ERR_PTR(-EACCES); |
| 117 | goto bail_unlock; |
| 118 | } |
| 119 | |
| 120 | parent = d_alloc_anon(inode); |
| 121 | if (!parent) { |
| 122 | iput(inode); |
| 123 | parent = ERR_PTR(-ENOMEM); |
| 124 | } |
| 125 | |
Mark Fasheh | 379dfe9 | 2006-09-08 14:21:03 -0700 | [diff] [blame] | 126 | parent->d_op = &ocfs2_dentry_ops; |
| 127 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 128 | bail_unlock: |
| 129 | ocfs2_meta_unlock(dir, 0); |
| 130 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 131 | bail: |
| 132 | mlog_exit_ptr(parent); |
| 133 | |
| 134 | return parent; |
| 135 | } |
| 136 | |
Mark Fasheh | 1ca1a11 | 2007-04-27 16:01:25 -0700 | [diff] [blame] | 137 | static int ocfs2_encode_fh(struct dentry *dentry, u32 *fh_in, int *max_len, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 138 | int connectable) |
| 139 | { |
| 140 | struct inode *inode = dentry->d_inode; |
| 141 | int len = *max_len; |
| 142 | int type = 1; |
| 143 | u64 blkno; |
| 144 | u32 generation; |
Mark Fasheh | 1ca1a11 | 2007-04-27 16:01:25 -0700 | [diff] [blame] | 145 | __le32 *fh = (__force __le32 *) fh_in; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 146 | |
| 147 | mlog_entry("(0x%p, '%.*s', 0x%p, %d, %d)\n", dentry, |
| 148 | dentry->d_name.len, dentry->d_name.name, |
| 149 | fh, len, connectable); |
| 150 | |
| 151 | if (len < 3 || (connectable && len < 6)) { |
| 152 | mlog(ML_ERROR, "fh buffer is too small for encoding\n"); |
| 153 | type = 255; |
| 154 | goto bail; |
| 155 | } |
| 156 | |
| 157 | blkno = OCFS2_I(inode)->ip_blkno; |
| 158 | generation = inode->i_generation; |
| 159 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 160 | mlog(0, "Encoding fh: blkno: %llu, generation: %u\n", |
| 161 | (unsigned long long)blkno, generation); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 162 | |
| 163 | len = 3; |
| 164 | fh[0] = cpu_to_le32((u32)(blkno >> 32)); |
| 165 | fh[1] = cpu_to_le32((u32)(blkno & 0xffffffff)); |
| 166 | fh[2] = cpu_to_le32(generation); |
| 167 | |
| 168 | if (connectable && !S_ISDIR(inode->i_mode)) { |
| 169 | struct inode *parent; |
| 170 | |
| 171 | spin_lock(&dentry->d_lock); |
| 172 | |
| 173 | parent = dentry->d_parent->d_inode; |
| 174 | blkno = OCFS2_I(parent)->ip_blkno; |
| 175 | generation = parent->i_generation; |
| 176 | |
| 177 | fh[3] = cpu_to_le32((u32)(blkno >> 32)); |
| 178 | fh[4] = cpu_to_le32((u32)(blkno & 0xffffffff)); |
| 179 | fh[5] = cpu_to_le32(generation); |
| 180 | |
| 181 | spin_unlock(&dentry->d_lock); |
| 182 | |
| 183 | len = 6; |
| 184 | type = 2; |
| 185 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 186 | mlog(0, "Encoding parent: blkno: %llu, generation: %u\n", |
| 187 | (unsigned long long)blkno, generation); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 188 | } |
| 189 | |
| 190 | *max_len = len; |
| 191 | |
| 192 | bail: |
| 193 | mlog_exit(type); |
| 194 | return type; |
| 195 | } |
| 196 | |
Christoph Hellwig | 644f9ab | 2007-10-21 16:42:15 -0700 | [diff] [blame] | 197 | static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb, |
| 198 | struct fid *fid, int fh_len, int fh_type) |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 199 | { |
Christoph Hellwig | 644f9ab | 2007-10-21 16:42:15 -0700 | [diff] [blame] | 200 | struct ocfs2_inode_handle handle; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 201 | |
Christoph Hellwig | 644f9ab | 2007-10-21 16:42:15 -0700 | [diff] [blame] | 202 | if (fh_len < 3 || fh_type > 2) |
| 203 | return NULL; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 204 | |
Christoph Hellwig | 644f9ab | 2007-10-21 16:42:15 -0700 | [diff] [blame] | 205 | handle.ih_blkno = (u64)le32_to_cpu(fid->raw[0]) << 32; |
| 206 | handle.ih_blkno |= (u64)le32_to_cpu(fid->raw[1]); |
| 207 | handle.ih_generation = le32_to_cpu(fid->raw[2]); |
| 208 | return ocfs2_get_dentry(sb, &handle); |
| 209 | } |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 210 | |
Christoph Hellwig | 644f9ab | 2007-10-21 16:42:15 -0700 | [diff] [blame] | 211 | static struct dentry *ocfs2_fh_to_parent(struct super_block *sb, |
| 212 | struct fid *fid, int fh_len, int fh_type) |
| 213 | { |
| 214 | struct ocfs2_inode_handle parent; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 215 | |
Christoph Hellwig | 644f9ab | 2007-10-21 16:42:15 -0700 | [diff] [blame] | 216 | if (fh_type != 2 || fh_len < 6) |
| 217 | return NULL; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 218 | |
Christoph Hellwig | 644f9ab | 2007-10-21 16:42:15 -0700 | [diff] [blame] | 219 | parent.ih_blkno = (u64)le32_to_cpu(fid->raw[3]) << 32; |
| 220 | parent.ih_blkno |= (u64)le32_to_cpu(fid->raw[4]); |
| 221 | parent.ih_generation = le32_to_cpu(fid->raw[5]); |
| 222 | return ocfs2_get_dentry(sb, &parent); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 223 | } |
| 224 | |
Christoph Hellwig | 3965516 | 2007-10-21 16:42:17 -0700 | [diff] [blame] | 225 | const struct export_operations ocfs2_export_ops = { |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 226 | .encode_fh = ocfs2_encode_fh, |
Christoph Hellwig | 644f9ab | 2007-10-21 16:42:15 -0700 | [diff] [blame] | 227 | .fh_to_dentry = ocfs2_fh_to_dentry, |
| 228 | .fh_to_parent = ocfs2_fh_to_parent, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 229 | .get_parent = ocfs2_get_parent, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 230 | }; |