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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
David Howells2b0143b2015-03-17 22:25:59 +000052 if (!parent || inode == d_inode(sb->s_root))
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 Virod81a8ef2013-05-16 14:14:48 -040067 struct dir_context ctx;
Al Viro629a21e2006-10-13 22:51:24 -040068 struct gfs2_inum_host inum;
David Teiglandb3b94fa2006-01-16 16:50:04 +000069 char *name;
70};
71
Miklos Szerediac7576f2014-10-30 17:37:34 +010072static int get_name_filldir(struct dir_context *ctx, const char *name,
73 int length, loff_t offset, u64 inum,
74 unsigned int type)
David Teiglandb3b94fa2006-01-16 16:50:04 +000075{
Miklos Szerediac7576f2014-10-30 17:37:34 +010076 struct get_name_filldir *gnfd =
77 container_of(ctx, struct get_name_filldir, ctx);
David Teiglandb3b94fa2006-01-16 16:50:04 +000078
Steven Whitehouse3699e3a2007-01-17 15:09:20 +000079 if (inum != gnfd->inum.no_addr)
David Teiglandb3b94fa2006-01-16 16:50:04 +000080 return 0;
81
82 memcpy(gnfd->name, name, length);
83 gnfd->name[length] = 0;
84
85 return 1;
86}
87
88static int gfs2_get_name(struct dentry *parent, char *name,
89 struct dentry *child)
90{
David Howells2b0143b2015-03-17 22:25:59 +000091 struct inode *dir = d_inode(parent);
92 struct inode *inode = d_inode(child);
David Teiglandb3b94fa2006-01-16 16:50:04 +000093 struct gfs2_inode *dip, *ip;
Al Viroac6614b2013-05-22 22:22:04 -040094 struct get_name_filldir gnfd = {
95 .ctx.actor = get_name_filldir,
96 .name = name
97 };
David Teiglandb3b94fa2006-01-16 16:50:04 +000098 struct gfs2_holder gh;
David Teiglandb3b94fa2006-01-16 16:50:04 +000099 int error;
Bob Petersondfe4d342011-10-27 12:16:06 -0400100 struct file_ra_state f_ra = { .start = 0 };
David Teiglandb3b94fa2006-01-16 16:50:04 +0000101
102 if (!dir)
103 return -EINVAL;
104
David Teiglandb3b94fa2006-01-16 16:50:04 +0000105 if (!S_ISDIR(dir->i_mode) || !inode)
106 return -EINVAL;
107
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400108 dip = GFS2_I(dir);
109 ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000110
111 *name = 0;
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100112 gnfd.inum.no_addr = ip->i_no_addr;
113 gnfd.inum.no_formal_ino = ip->i_no_formal_ino;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000114
115 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh);
116 if (error)
117 return error;
118
Al Virod81a8ef2013-05-16 14:14:48 -0400119 error = gfs2_dir_read(dir, &gnfd.ctx, &f_ra);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000120
121 gfs2_glock_dq_uninit(&gh);
122
123 if (!error && !*name)
124 error = -ENOENT;
125
126 return error;
127}
128
129static struct dentry *gfs2_get_parent(struct dentry *child)
130{
David Howells2b0143b2015-03-17 22:25:59 +0000131 return d_obtain_alias(gfs2_lookupi(d_inode(child), &gfs2_qdotdot, 1));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000132}
133
Christoph Hellwig34c0d152007-10-21 16:42:14 -0700134static struct dentry *gfs2_get_dentry(struct super_block *sb,
Steven Whitehouseacf7e242009-09-08 18:00:30 +0100135 struct gfs2_inum_host *inum)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000136{
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500137 struct gfs2_sbd *sdp = sb->s_fs_info;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000138 struct inode *inode;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000139
Steven Whitehouse4667a0e2011-04-18 14:18:09 +0100140 inode = gfs2_ilookup(sb, inum->no_addr, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000141 if (inode) {
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100142 if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000143 iput(inode);
144 return ERR_PTR(-ESTALE);
145 }
146 goto out_inode;
147 }
148
Steven Whitehouse044b9412010-11-03 20:01:07 +0000149 inode = gfs2_lookup_by_inum(sdp, inum->no_addr, &inum->no_formal_ino,
150 GFS2_BLKST_DINODE);
151 if (IS_ERR(inode))
152 return ERR_CAST(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000153
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400154out_inode:
Al Viro41ced6d2010-12-18 12:06:56 -0500155 return d_obtain_alias(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000156}
157
Christoph Hellwig34c0d152007-10-21 16:42:14 -0700158static struct dentry *gfs2_fh_to_dentry(struct super_block *sb, struct fid *fid,
159 int fh_len, int fh_type)
160{
161 struct gfs2_inum_host this;
162 __be32 *fh = (__force __be32 *)fid->raw;
163
164 switch (fh_type) {
165 case GFS2_SMALL_FH_SIZE:
166 case GFS2_LARGE_FH_SIZE:
167 case GFS2_OLD_FH_SIZE:
Hugh Dickins35c2a7f2012-10-07 20:32:51 -0700168 if (fh_len < GFS2_SMALL_FH_SIZE)
169 return NULL;
Christoph Hellwig34c0d152007-10-21 16:42:14 -0700170 this.no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32;
171 this.no_formal_ino |= be32_to_cpu(fh[1]);
172 this.no_addr = ((u64)be32_to_cpu(fh[2])) << 32;
173 this.no_addr |= be32_to_cpu(fh[3]);
174 return gfs2_get_dentry(sb, &this);
175 default:
176 return NULL;
177 }
178}
179
180static struct dentry *gfs2_fh_to_parent(struct super_block *sb, struct fid *fid,
181 int fh_len, int fh_type)
182{
183 struct gfs2_inum_host parent;
184 __be32 *fh = (__force __be32 *)fid->raw;
185
186 switch (fh_type) {
187 case GFS2_LARGE_FH_SIZE:
188 case GFS2_OLD_FH_SIZE:
Hugh Dickins35c2a7f2012-10-07 20:32:51 -0700189 if (fh_len < GFS2_LARGE_FH_SIZE)
190 return NULL;
Christoph Hellwig34c0d152007-10-21 16:42:14 -0700191 parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32;
192 parent.no_formal_ino |= be32_to_cpu(fh[5]);
193 parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32;
194 parent.no_addr |= be32_to_cpu(fh[7]);
195 return gfs2_get_dentry(sb, &parent);
196 default:
197 return NULL;
198 }
199}
200
Christoph Hellwig39655162007-10-21 16:42:17 -0700201const struct export_operations gfs2_export_ops = {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000202 .encode_fh = gfs2_encode_fh,
Christoph Hellwig34c0d152007-10-21 16:42:14 -0700203 .fh_to_dentry = gfs2_fh_to_dentry,
204 .fh_to_parent = gfs2_fh_to_parent,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000205 .get_name = gfs2_get_name,
206 .get_parent = gfs2_get_parent,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000207};
208