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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 Virob44b84d2006-10-14 10:46:30 -040031static int gfs2_encode_fh(struct dentry *dentry, __u32 *p, int *len,
David Teiglandb3b94fa2006-01-16 16:50:04 +000032 int connectable)
33{
Al Virob44b84d2006-10-14 10:46:30 -040034 __be32 *fh = (__force __be32 *)p;
David Teiglandb3b94fa2006-01-16 16:50:04 +000035 struct inode *inode = dentry->d_inode;
Steven Whitehousec9fd4302006-03-01 15:31:02 -050036 struct super_block *sb = inode->i_sb;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040037 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +000038
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +053039 if (connectable && (*len < GFS2_LARGE_FH_SIZE)) {
40 *len = GFS2_LARGE_FH_SIZE;
David Teiglandb3b94fa2006-01-16 16:50:04 +000041 return 255;
Aneesh Kumar K.V5fe0c232011-01-29 18:43:25 +053042 } else if (*len < GFS2_SMALL_FH_SIZE) {
43 *len = GFS2_SMALL_FH_SIZE;
44 return 255;
45 }
David Teiglandb3b94fa2006-01-16 16:50:04 +000046
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010047 fh[0] = cpu_to_be32(ip->i_no_formal_ino >> 32);
48 fh[1] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
49 fh[2] = cpu_to_be32(ip->i_no_addr >> 32);
50 fh[3] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
Steven Whitehouse5acd3962006-09-04 16:16:45 -040051 *len = GFS2_SMALL_FH_SIZE;
David Teiglandb3b94fa2006-01-16 16:50:04 +000052
Steven Whitehousec9fd4302006-03-01 15:31:02 -050053 if (!connectable || inode == sb->s_root->d_inode)
David Teiglandb3b94fa2006-01-16 16:50:04 +000054 return *len;
55
56 spin_lock(&dentry->d_lock);
57 inode = dentry->d_parent->d_inode;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040058 ip = GFS2_I(inode);
59 igrab(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +000060 spin_unlock(&dentry->d_lock);
61
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010062 fh[4] = cpu_to_be32(ip->i_no_formal_ino >> 32);
63 fh[5] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
64 fh[6] = cpu_to_be32(ip->i_no_addr >> 32);
65 fh[7] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
Steven Whitehouse5acd3962006-09-04 16:16:45 -040066 *len = GFS2_LARGE_FH_SIZE;
David Teiglandb3b94fa2006-01-16 16:50:04 +000067
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040068 iput(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +000069
70 return *len;
71}
72
73struct get_name_filldir {
Al Viro629a21e2006-10-13 22:51:24 -040074 struct gfs2_inum_host inum;
David Teiglandb3b94fa2006-01-16 16:50:04 +000075 char *name;
76};
77
Steven Whitehouse3699e3a2007-01-17 15:09:20 +000078static int get_name_filldir(void *opaque, const char *name, int length,
79 loff_t offset, u64 inum, unsigned int type)
David Teiglandb3b94fa2006-01-16 16:50:04 +000080{
Steven Whitehouse3699e3a2007-01-17 15:09:20 +000081 struct get_name_filldir *gnfd = opaque;
David Teiglandb3b94fa2006-01-16 16:50:04 +000082
Steven Whitehouse3699e3a2007-01-17 15:09:20 +000083 if (inum != gnfd->inum.no_addr)
David Teiglandb3b94fa2006-01-16 16:50:04 +000084 return 0;
85
86 memcpy(gnfd->name, name, length);
87 gnfd->name[length] = 0;
88
89 return 1;
90}
91
92static int gfs2_get_name(struct dentry *parent, char *name,
93 struct dentry *child)
94{
95 struct inode *dir = parent->d_inode;
96 struct inode *inode = child->d_inode;
97 struct gfs2_inode *dip, *ip;
98 struct get_name_filldir gnfd;
99 struct gfs2_holder gh;
Steven Whitehousecd915492006-09-04 12:49:07 -0400100 u64 offset = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000101 int error;
102
103 if (!dir)
104 return -EINVAL;
105
David Teiglandb3b94fa2006-01-16 16:50:04 +0000106 if (!S_ISDIR(dir->i_mode) || !inode)
107 return -EINVAL;
108
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400109 dip = GFS2_I(dir);
110 ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000111
112 *name = 0;
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100113 gnfd.inum.no_addr = ip->i_no_addr;
114 gnfd.inum.no_formal_ino = ip->i_no_formal_ino;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000115 gnfd.name = name;
116
117 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh);
118 if (error)
119 return error;
120
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500121 error = gfs2_dir_read(dir, &offset, &gnfd, get_name_filldir);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000122
123 gfs2_glock_dq_uninit(&gh);
124
125 if (!error && !*name)
126 error = -ENOENT;
127
128 return error;
129}
130
131static struct dentry *gfs2_get_parent(struct dentry *child)
132{
Al Viro41ced6d2010-12-18 12:06:56 -0500133 return d_obtain_alias(gfs2_lookupi(child->d_inode, &gfs2_qdotdot, 1));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000134}
135
Christoph Hellwig34c0d152007-10-21 16:42:14 -0700136static struct dentry *gfs2_get_dentry(struct super_block *sb,
Steven Whitehouseacf7e242009-09-08 18:00:30 +0100137 struct gfs2_inum_host *inum)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000138{
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500139 struct gfs2_sbd *sdp = sb->s_fs_info;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000140 struct inode *inode;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000141
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100142 inode = gfs2_ilookup(sb, inum->no_addr);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000143 if (inode) {
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100144 if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000145 iput(inode);
146 return ERR_PTR(-ESTALE);
147 }
148 goto out_inode;
149 }
150
Steven Whitehouse044b9412010-11-03 20:01:07 +0000151 inode = gfs2_lookup_by_inum(sdp, inum->no_addr, &inum->no_formal_ino,
152 GFS2_BLKST_DINODE);
153 if (IS_ERR(inode))
154 return ERR_CAST(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000155
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400156out_inode:
Al Viro41ced6d2010-12-18 12:06:56 -0500157 return d_obtain_alias(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000158}
159
Christoph Hellwig34c0d152007-10-21 16:42:14 -0700160static struct dentry *gfs2_fh_to_dentry(struct super_block *sb, struct fid *fid,
161 int fh_len, int fh_type)
162{
163 struct gfs2_inum_host this;
164 __be32 *fh = (__force __be32 *)fid->raw;
165
166 switch (fh_type) {
167 case GFS2_SMALL_FH_SIZE:
168 case GFS2_LARGE_FH_SIZE:
169 case GFS2_OLD_FH_SIZE:
170 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:
189 parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32;
190 parent.no_formal_ino |= be32_to_cpu(fh[5]);
191 parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32;
192 parent.no_addr |= be32_to_cpu(fh[7]);
193 return gfs2_get_dentry(sb, &parent);
194 default:
195 return NULL;
196 }
197}
198
Christoph Hellwig39655162007-10-21 16:42:17 -0700199const struct export_operations gfs2_export_ops = {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000200 .encode_fh = gfs2_encode_fh,
Christoph Hellwig34c0d152007-10-21 16:42:14 -0700201 .fh_to_dentry = gfs2_fh_to_dentry,
202 .fh_to_parent = gfs2_fh_to_parent,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000203 .get_name = gfs2_get_name,
204 .get_parent = gfs2_get_parent,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000205};
206