1ccd979bdSMark Fasheh /* -*- mode: c; c-basic-offset: 8; -*- 2ccd979bdSMark Fasheh * vim: noexpandtab sw=8 ts=8 sts=0: 3ccd979bdSMark Fasheh * 4ccd979bdSMark Fasheh * export.c 5ccd979bdSMark Fasheh * 6ccd979bdSMark Fasheh * Functions to facilitate NFS exporting 7ccd979bdSMark Fasheh * 8ccd979bdSMark Fasheh * Copyright (C) 2002, 2005 Oracle. All rights reserved. 9ccd979bdSMark Fasheh * 10ccd979bdSMark Fasheh * This program is free software; you can redistribute it and/or 11ccd979bdSMark Fasheh * modify it under the terms of the GNU General Public 12ccd979bdSMark Fasheh * License as published by the Free Software Foundation; either 13ccd979bdSMark Fasheh * version 2 of the License, or (at your option) any later version. 14ccd979bdSMark Fasheh * 15ccd979bdSMark Fasheh * This program is distributed in the hope that it will be useful, 16ccd979bdSMark Fasheh * but WITHOUT ANY WARRANTY; without even the implied warranty of 17ccd979bdSMark Fasheh * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18ccd979bdSMark Fasheh * General Public License for more details. 19ccd979bdSMark Fasheh * 20ccd979bdSMark Fasheh * You should have received a copy of the GNU General Public 21ccd979bdSMark Fasheh * License along with this program; if not, write to the 22ccd979bdSMark Fasheh * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 23ccd979bdSMark Fasheh * Boston, MA 021110-1307, USA. 24ccd979bdSMark Fasheh */ 25ccd979bdSMark Fasheh 26ccd979bdSMark Fasheh #include <linux/fs.h> 27ccd979bdSMark Fasheh #include <linux/types.h> 28ccd979bdSMark Fasheh 29ccd979bdSMark Fasheh #define MLOG_MASK_PREFIX ML_EXPORT 30ccd979bdSMark Fasheh #include <cluster/masklog.h> 31ccd979bdSMark Fasheh 32ccd979bdSMark Fasheh #include "ocfs2.h" 33ccd979bdSMark Fasheh 34ccd979bdSMark Fasheh #include "dir.h" 35ccd979bdSMark Fasheh #include "dlmglue.h" 36379dfe9dSMark Fasheh #include "dcache.h" 37ccd979bdSMark Fasheh #include "export.h" 38ccd979bdSMark Fasheh #include "inode.h" 39ccd979bdSMark Fasheh 40ccd979bdSMark Fasheh #include "buffer_head_io.h" 41ccd979bdSMark Fasheh 42ccd979bdSMark Fasheh struct ocfs2_inode_handle 43ccd979bdSMark Fasheh { 44ccd979bdSMark Fasheh u64 ih_blkno; 45ccd979bdSMark Fasheh u32 ih_generation; 46ccd979bdSMark Fasheh }; 47ccd979bdSMark Fasheh 48644f9ab3SChristoph Hellwig static struct dentry *ocfs2_get_dentry(struct super_block *sb, 49644f9ab3SChristoph Hellwig struct ocfs2_inode_handle *handle) 50ccd979bdSMark Fasheh { 51ccd979bdSMark Fasheh struct inode *inode; 52ccd979bdSMark Fasheh struct dentry *result; 53ccd979bdSMark Fasheh 54ccd979bdSMark Fasheh mlog_entry("(0x%p, 0x%p)\n", sb, handle); 55ccd979bdSMark Fasheh 56ccd979bdSMark Fasheh if (handle->ih_blkno == 0) { 57ccd979bdSMark Fasheh mlog_errno(-ESTALE); 58ccd979bdSMark Fasheh return ERR_PTR(-ESTALE); 59ccd979bdSMark Fasheh } 60ccd979bdSMark Fasheh 6124c19ef4SMark Fasheh inode = ocfs2_iget(OCFS2_SB(sb), handle->ih_blkno, 0); 62ccd979bdSMark Fasheh 636a1bd4a5SMark Fasheh if (IS_ERR(inode)) 64ccd979bdSMark Fasheh return (void *)inode; 65ccd979bdSMark Fasheh 66ccd979bdSMark Fasheh if (handle->ih_generation != inode->i_generation) { 67ccd979bdSMark Fasheh iput(inode); 68ccd979bdSMark Fasheh return ERR_PTR(-ESTALE); 69ccd979bdSMark Fasheh } 70ccd979bdSMark Fasheh 71ccd979bdSMark Fasheh result = d_alloc_anon(inode); 72ccd979bdSMark Fasheh 73ccd979bdSMark Fasheh if (!result) { 74ccd979bdSMark Fasheh iput(inode); 75ccd979bdSMark Fasheh mlog_errno(-ENOMEM); 76ccd979bdSMark Fasheh return ERR_PTR(-ENOMEM); 77ccd979bdSMark Fasheh } 78379dfe9dSMark Fasheh result->d_op = &ocfs2_dentry_ops; 79ccd979bdSMark Fasheh 80ccd979bdSMark Fasheh mlog_exit_ptr(result); 81ccd979bdSMark Fasheh return result; 82ccd979bdSMark Fasheh } 83ccd979bdSMark Fasheh 84ccd979bdSMark Fasheh static struct dentry *ocfs2_get_parent(struct dentry *child) 85ccd979bdSMark Fasheh { 86ccd979bdSMark Fasheh int status; 87ccd979bdSMark Fasheh u64 blkno; 88ccd979bdSMark Fasheh struct dentry *parent; 89ccd979bdSMark Fasheh struct inode *inode; 90ccd979bdSMark Fasheh struct inode *dir = child->d_inode; 91ccd979bdSMark Fasheh 92ccd979bdSMark Fasheh mlog_entry("(0x%p, '%.*s')\n", child, 93ccd979bdSMark Fasheh child->d_name.len, child->d_name.name); 94ccd979bdSMark Fasheh 95b0697053SMark Fasheh mlog(0, "find parent of directory %llu\n", 96b0697053SMark Fasheh (unsigned long long)OCFS2_I(dir)->ip_blkno); 97ccd979bdSMark Fasheh 984bcec184SMark Fasheh status = ocfs2_meta_lock(dir, NULL, 0); 99ccd979bdSMark Fasheh if (status < 0) { 100ccd979bdSMark Fasheh if (status != -ENOENT) 101ccd979bdSMark Fasheh mlog_errno(status); 102ccd979bdSMark Fasheh parent = ERR_PTR(status); 103ccd979bdSMark Fasheh goto bail; 104ccd979bdSMark Fasheh } 105ccd979bdSMark Fasheh 106be94d117SMark Fasheh status = ocfs2_lookup_ino_from_name(dir, "..", 2, &blkno); 107ccd979bdSMark Fasheh if (status < 0) { 108ccd979bdSMark Fasheh parent = ERR_PTR(-ENOENT); 109ccd979bdSMark Fasheh goto bail_unlock; 110ccd979bdSMark Fasheh } 111ccd979bdSMark Fasheh 11224c19ef4SMark Fasheh inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0); 113ccd979bdSMark Fasheh if (IS_ERR(inode)) { 114b0697053SMark Fasheh mlog(ML_ERROR, "Unable to create inode %llu\n", 115b0697053SMark Fasheh (unsigned long long)blkno); 116ccd979bdSMark Fasheh parent = ERR_PTR(-EACCES); 117ccd979bdSMark Fasheh goto bail_unlock; 118ccd979bdSMark Fasheh } 119ccd979bdSMark Fasheh 120ccd979bdSMark Fasheh parent = d_alloc_anon(inode); 121ccd979bdSMark Fasheh if (!parent) { 122ccd979bdSMark Fasheh iput(inode); 123ccd979bdSMark Fasheh parent = ERR_PTR(-ENOMEM); 124ccd979bdSMark Fasheh } 125ccd979bdSMark Fasheh 126379dfe9dSMark Fasheh parent->d_op = &ocfs2_dentry_ops; 127379dfe9dSMark Fasheh 128ccd979bdSMark Fasheh bail_unlock: 129ccd979bdSMark Fasheh ocfs2_meta_unlock(dir, 0); 130ccd979bdSMark Fasheh 131ccd979bdSMark Fasheh bail: 132ccd979bdSMark Fasheh mlog_exit_ptr(parent); 133ccd979bdSMark Fasheh 134ccd979bdSMark Fasheh return parent; 135ccd979bdSMark Fasheh } 136ccd979bdSMark Fasheh 1371ca1a111SMark Fasheh static int ocfs2_encode_fh(struct dentry *dentry, u32 *fh_in, int *max_len, 138ccd979bdSMark Fasheh int connectable) 139ccd979bdSMark Fasheh { 140ccd979bdSMark Fasheh struct inode *inode = dentry->d_inode; 141ccd979bdSMark Fasheh int len = *max_len; 142ccd979bdSMark Fasheh int type = 1; 143ccd979bdSMark Fasheh u64 blkno; 144ccd979bdSMark Fasheh u32 generation; 1451ca1a111SMark Fasheh __le32 *fh = (__force __le32 *) fh_in; 146ccd979bdSMark Fasheh 147ccd979bdSMark Fasheh mlog_entry("(0x%p, '%.*s', 0x%p, %d, %d)\n", dentry, 148ccd979bdSMark Fasheh dentry->d_name.len, dentry->d_name.name, 149ccd979bdSMark Fasheh fh, len, connectable); 150ccd979bdSMark Fasheh 151ccd979bdSMark Fasheh if (len < 3 || (connectable && len < 6)) { 152ccd979bdSMark Fasheh mlog(ML_ERROR, "fh buffer is too small for encoding\n"); 153ccd979bdSMark Fasheh type = 255; 154ccd979bdSMark Fasheh goto bail; 155ccd979bdSMark Fasheh } 156ccd979bdSMark Fasheh 157ccd979bdSMark Fasheh blkno = OCFS2_I(inode)->ip_blkno; 158ccd979bdSMark Fasheh generation = inode->i_generation; 159ccd979bdSMark Fasheh 160b0697053SMark Fasheh mlog(0, "Encoding fh: blkno: %llu, generation: %u\n", 161b0697053SMark Fasheh (unsigned long long)blkno, generation); 162ccd979bdSMark Fasheh 163ccd979bdSMark Fasheh len = 3; 164ccd979bdSMark Fasheh fh[0] = cpu_to_le32((u32)(blkno >> 32)); 165ccd979bdSMark Fasheh fh[1] = cpu_to_le32((u32)(blkno & 0xffffffff)); 166ccd979bdSMark Fasheh fh[2] = cpu_to_le32(generation); 167ccd979bdSMark Fasheh 168ccd979bdSMark Fasheh if (connectable && !S_ISDIR(inode->i_mode)) { 169ccd979bdSMark Fasheh struct inode *parent; 170ccd979bdSMark Fasheh 171ccd979bdSMark Fasheh spin_lock(&dentry->d_lock); 172ccd979bdSMark Fasheh 173ccd979bdSMark Fasheh parent = dentry->d_parent->d_inode; 174ccd979bdSMark Fasheh blkno = OCFS2_I(parent)->ip_blkno; 175ccd979bdSMark Fasheh generation = parent->i_generation; 176ccd979bdSMark Fasheh 177ccd979bdSMark Fasheh fh[3] = cpu_to_le32((u32)(blkno >> 32)); 178ccd979bdSMark Fasheh fh[4] = cpu_to_le32((u32)(blkno & 0xffffffff)); 179ccd979bdSMark Fasheh fh[5] = cpu_to_le32(generation); 180ccd979bdSMark Fasheh 181ccd979bdSMark Fasheh spin_unlock(&dentry->d_lock); 182ccd979bdSMark Fasheh 183ccd979bdSMark Fasheh len = 6; 184ccd979bdSMark Fasheh type = 2; 185ccd979bdSMark Fasheh 186b0697053SMark Fasheh mlog(0, "Encoding parent: blkno: %llu, generation: %u\n", 187b0697053SMark Fasheh (unsigned long long)blkno, generation); 188ccd979bdSMark Fasheh } 189ccd979bdSMark Fasheh 190ccd979bdSMark Fasheh *max_len = len; 191ccd979bdSMark Fasheh 192ccd979bdSMark Fasheh bail: 193ccd979bdSMark Fasheh mlog_exit(type); 194ccd979bdSMark Fasheh return type; 195ccd979bdSMark Fasheh } 196ccd979bdSMark Fasheh 197644f9ab3SChristoph Hellwig static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb, 198644f9ab3SChristoph Hellwig struct fid *fid, int fh_len, int fh_type) 199ccd979bdSMark Fasheh { 200644f9ab3SChristoph Hellwig struct ocfs2_inode_handle handle; 201ccd979bdSMark Fasheh 202644f9ab3SChristoph Hellwig if (fh_len < 3 || fh_type > 2) 203644f9ab3SChristoph Hellwig return NULL; 204ccd979bdSMark Fasheh 205644f9ab3SChristoph Hellwig handle.ih_blkno = (u64)le32_to_cpu(fid->raw[0]) << 32; 206644f9ab3SChristoph Hellwig handle.ih_blkno |= (u64)le32_to_cpu(fid->raw[1]); 207644f9ab3SChristoph Hellwig handle.ih_generation = le32_to_cpu(fid->raw[2]); 208644f9ab3SChristoph Hellwig return ocfs2_get_dentry(sb, &handle); 209ccd979bdSMark Fasheh } 210ccd979bdSMark Fasheh 211644f9ab3SChristoph Hellwig static struct dentry *ocfs2_fh_to_parent(struct super_block *sb, 212644f9ab3SChristoph Hellwig struct fid *fid, int fh_len, int fh_type) 213644f9ab3SChristoph Hellwig { 214644f9ab3SChristoph Hellwig struct ocfs2_inode_handle parent; 215ccd979bdSMark Fasheh 216644f9ab3SChristoph Hellwig if (fh_type != 2 || fh_len < 6) 217644f9ab3SChristoph Hellwig return NULL; 218ccd979bdSMark Fasheh 219644f9ab3SChristoph Hellwig parent.ih_blkno = (u64)le32_to_cpu(fid->raw[3]) << 32; 220644f9ab3SChristoph Hellwig parent.ih_blkno |= (u64)le32_to_cpu(fid->raw[4]); 221644f9ab3SChristoph Hellwig parent.ih_generation = le32_to_cpu(fid->raw[5]); 222644f9ab3SChristoph Hellwig return ocfs2_get_dentry(sb, &parent); 223ccd979bdSMark Fasheh } 224ccd979bdSMark Fasheh 22539655164SChristoph Hellwig const struct export_operations ocfs2_export_ops = { 226ccd979bdSMark Fasheh .encode_fh = ocfs2_encode_fh, 227644f9ab3SChristoph Hellwig .fh_to_dentry = ocfs2_fh_to_dentry, 228644f9ab3SChristoph Hellwig .fh_to_parent = ocfs2_fh_to_parent, 229ccd979bdSMark Fasheh .get_parent = ocfs2_get_parent, 230ccd979bdSMark Fasheh }; 231