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David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Steven Whitehouse3a8a9a12006-05-18 15:09:15 -04003 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +00004 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
Steven Whitehousee9fc2aa2006-09-01 11:05:15 -04007 * of the GNU General Public License version 2.
David Teiglandb3b94fa2006-01-16 16:50:04 +00008 */
9
David Teiglandb3b94fa2006-01-16 16:50:04 +000010#include <linux/spinlock.h>
11#include <linux/completion.h>
12#include <linux/buffer_head.h>
Christoph Hellwiga5694252007-07-17 04:04:28 -070013#include <linux/exportfs.h>
Steven Whitehouse5c676f62006-02-27 17:23:27 -050014#include <linux/gfs2_ondisk.h>
Steven Whitehouse71b86f52006-03-28 14:14:04 -050015#include <linux/crc32.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000016
17#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050018#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000019#include "dir.h"
20#include "glock.h"
21#include "glops.h"
22#include "inode.h"
Steven Whitehouseb2760582008-10-14 16:05:55 +010023#include "super.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000024#include "rgrp.h"
Steven Whitehousec7526662006-03-20 12:30:04 -050025#include "util.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000026
Steven Whitehousebb8d8a62007-06-01 14:11:58 +010027#define GFS2_SMALL_FH_SIZE 4
Wendy Cheng35dcc522007-06-27 17:07:53 -040028#define GFS2_LARGE_FH_SIZE 8
Steven Whitehouse3ebf4492007-07-10 12:28:27 +010029#define GFS2_OLD_FH_SIZE 10
Steven Whitehousebb8d8a62007-06-01 14:11:58 +010030
Al Virob0b03822012-04-02 14:34:06 -040031static int gfs2_encode_fh(struct inode *inode, __u32 *p, int *len,
32 struct inode *parent)
David Teiglandb3b94fa2006-01-16 16:50:04 +000033{
Al Virob44b84d2006-10-14 10:46:30 -040034 __be32 *fh = (__force __be32 *)p;
Steven Whitehousec9fd4302006-03-01 15:31:02 -050035 struct super_block *sb = inode->i_sb;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040036 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +000037
Al Virob0b03822012-04-02 14:34:06 -040038 if (parent && (*len < GFS2_LARGE_FH_SIZE)) {
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +053039 *len = GFS2_LARGE_FH_SIZE;
Namjae Jeon94e07a752013-02-17 15:48:11 +090040 return FILEID_INVALID;
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +053041 } else if (*len < GFS2_SMALL_FH_SIZE) {
42 *len = GFS2_SMALL_FH_SIZE;
Namjae Jeon94e07a752013-02-17 15:48:11 +090043 return FILEID_INVALID;
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +053044 }
David Teiglandb3b94fa2006-01-16 16:50:04 +000045
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010046 fh[0] = cpu_to_be32(ip->i_no_formal_ino >> 32);
47 fh[1] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
48 fh[2] = cpu_to_be32(ip->i_no_addr >> 32);
49 fh[3] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
Steven Whitehouse5acd3962006-09-04 16:16:45 -040050 *len = GFS2_SMALL_FH_SIZE;
David Teiglandb3b94fa2006-01-16 16:50:04 +000051
Al Virob0b03822012-04-02 14:34:06 -040052 if (!parent || inode == sb->s_root->d_inode)
David Teiglandb3b94fa2006-01-16 16:50:04 +000053 return *len;
54
Al Virob0b03822012-04-02 14:34:06 -040055 ip = GFS2_I(parent);
David Teiglandb3b94fa2006-01-16 16:50:04 +000056
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010057 fh[4] = cpu_to_be32(ip->i_no_formal_ino >> 32);
58 fh[5] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
59 fh[6] = cpu_to_be32(ip->i_no_addr >> 32);
60 fh[7] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
Steven Whitehouse5acd3962006-09-04 16:16:45 -040061 *len = GFS2_LARGE_FH_SIZE;
David Teiglandb3b94fa2006-01-16 16:50:04 +000062
David Teiglandb3b94fa2006-01-16 16:50:04 +000063 return *len;
64}
65
66struct get_name_filldir {
Al Viro629a21e2006-10-13 22:51:24 -040067 struct gfs2_inum_host inum;
David Teiglandb3b94fa2006-01-16 16:50:04 +000068 char *name;
69};
70
Steven Whitehouse3699e3a2007-01-17 15:09:20 +000071static int get_name_filldir(void *opaque, const char *name, int length,
72 loff_t offset, u64 inum, unsigned int type)
David Teiglandb3b94fa2006-01-16 16:50:04 +000073{
Steven Whitehouse3699e3a2007-01-17 15:09:20 +000074 struct get_name_filldir *gnfd = opaque;
David Teiglandb3b94fa2006-01-16 16:50:04 +000075
Steven Whitehouse3699e3a2007-01-17 15:09:20 +000076 if (inum != gnfd->inum.no_addr)
David Teiglandb3b94fa2006-01-16 16:50:04 +000077 return 0;
78
79 memcpy(gnfd->name, name, length);
80 gnfd->name[length] = 0;
81
82 return 1;
83}
84
85static int gfs2_get_name(struct dentry *parent, char *name,
86 struct dentry *child)
87{
88 struct inode *dir = parent->d_inode;
89 struct inode *inode = child->d_inode;
90 struct gfs2_inode *dip, *ip;
91 struct get_name_filldir gnfd;
92 struct gfs2_holder gh;
Steven Whitehousecd915492006-09-04 12:49:07 -040093 u64 offset = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +000094 int error;
Bob Petersondfe4d342011-10-27 12:16:06 -040095 struct file_ra_state f_ra = { .start = 0 };
David Teiglandb3b94fa2006-01-16 16:50:04 +000096
97 if (!dir)
98 return -EINVAL;
99
David Teiglandb3b94fa2006-01-16 16:50:04 +0000100 if (!S_ISDIR(dir->i_mode) || !inode)
101 return -EINVAL;
102
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400103 dip = GFS2_I(dir);
104 ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000105
106 *name = 0;
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100107 gnfd.inum.no_addr = ip->i_no_addr;
108 gnfd.inum.no_formal_ino = ip->i_no_formal_ino;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000109 gnfd.name = name;
110
111 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh);
112 if (error)
113 return error;
114
Bob Petersondfe4d342011-10-27 12:16:06 -0400115 error = gfs2_dir_read(dir, &offset, &gnfd, get_name_filldir, &f_ra);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000116
117 gfs2_glock_dq_uninit(&gh);
118
119 if (!error && !*name)
120 error = -ENOENT;
121
122 return error;
123}
124
125static struct dentry *gfs2_get_parent(struct dentry *child)
126{
Al Viro41ced6d2010-12-18 12:06:56 -0500127 return d_obtain_alias(gfs2_lookupi(child->d_inode, &gfs2_qdotdot, 1));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000128}
129
Christoph Hellwig34c0d152007-10-21 16:42:14 -0700130static struct dentry *gfs2_get_dentry(struct super_block *sb,
Steven Whitehouseacf7e242009-09-08 18:00:30 +0100131 struct gfs2_inum_host *inum)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000132{
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500133 struct gfs2_sbd *sdp = sb->s_fs_info;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000134 struct inode *inode;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000135
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100136 inode = gfs2_ilookup(sb, inum->no_addr, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000137 if (inode) {
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100138 if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000139 iput(inode);
140 return ERR_PTR(-ESTALE);
141 }
142 goto out_inode;
143 }
144
Steven Whitehouse044b9412010-11-03 20:01:07 +0000145 inode = gfs2_lookup_by_inum(sdp, inum->no_addr, &inum->no_formal_ino,
146 GFS2_BLKST_DINODE);
147 if (IS_ERR(inode))
148 return ERR_CAST(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000149
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400150out_inode:
Al Viro41ced6d2010-12-18 12:06:56 -0500151 return d_obtain_alias(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000152}
153
Christoph Hellwig34c0d152007-10-21 16:42:14 -0700154static struct dentry *gfs2_fh_to_dentry(struct super_block *sb, struct fid *fid,
155 int fh_len, int fh_type)
156{
157 struct gfs2_inum_host this;
158 __be32 *fh = (__force __be32 *)fid->raw;
159
160 switch (fh_type) {
161 case GFS2_SMALL_FH_SIZE:
162 case GFS2_LARGE_FH_SIZE:
163 case GFS2_OLD_FH_SIZE:
Hugh Dickins35c2a7f2012-10-07 20:32:51 -0700164 if (fh_len < GFS2_SMALL_FH_SIZE)
165 return NULL;
Christoph Hellwig34c0d152007-10-21 16:42:14 -0700166 this.no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32;
167 this.no_formal_ino |= be32_to_cpu(fh[1]);
168 this.no_addr = ((u64)be32_to_cpu(fh[2])) << 32;
169 this.no_addr |= be32_to_cpu(fh[3]);
170 return gfs2_get_dentry(sb, &this);
171 default:
172 return NULL;
173 }
174}
175
176static struct dentry *gfs2_fh_to_parent(struct super_block *sb, struct fid *fid,
177 int fh_len, int fh_type)
178{
179 struct gfs2_inum_host parent;
180 __be32 *fh = (__force __be32 *)fid->raw;
181
182 switch (fh_type) {
183 case GFS2_LARGE_FH_SIZE:
184 case GFS2_OLD_FH_SIZE:
Hugh Dickins35c2a7f2012-10-07 20:32:51 -0700185 if (fh_len < GFS2_LARGE_FH_SIZE)
186 return NULL;
Christoph Hellwig34c0d152007-10-21 16:42:14 -0700187 parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32;
188 parent.no_formal_ino |= be32_to_cpu(fh[5]);
189 parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32;
190 parent.no_addr |= be32_to_cpu(fh[7]);
191 return gfs2_get_dentry(sb, &parent);
192 default:
193 return NULL;
194 }
195}
196
Christoph Hellwig39655162007-10-21 16:42:17 -0700197const struct export_operations gfs2_export_ops = {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000198 .encode_fh = gfs2_encode_fh,
Christoph Hellwig34c0d152007-10-21 16:42:14 -0700199 .fh_to_dentry = gfs2_fh_to_dentry,
200 .fh_to_parent = gfs2_fh_to_parent,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000201 .get_name = gfs2_get_name,
202 .get_parent = gfs2_get_parent,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000203};
204