blob: c291005ec59223e143ca38199861a94a450cd2f0 [file] [log] [blame]
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/slab.h>
11#include <linux/spinlock.h>
12#include <linux/completion.h>
13#include <linux/buffer_head.h>
Christoph Hellwiga5694252007-07-17 04:04:28 -070014#include <linux/exportfs.h>
Steven Whitehouse5c676f62006-02-27 17:23:27 -050015#include <linux/gfs2_ondisk.h>
Steven Whitehouse71b86f52006-03-28 14:14:04 -050016#include <linux/crc32.h>
Fabio Massimo Di Nitto7d308592006-09-19 07:56:29 +020017#include <linux/lm_interface.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000018
19#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050020#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000021#include "dir.h"
22#include "glock.h"
23#include "glops.h"
24#include "inode.h"
Robert Peterson70831462007-01-11 13:25:00 -060025#include "ops_dentry.h"
Steven Whitehousebb8d8a62007-06-01 14:11:58 +010026#include "ops_fstype.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000027#include "rgrp.h"
Steven Whitehousec7526662006-03-20 12:30:04 -050028#include "util.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000029
Steven Whitehousebb8d8a62007-06-01 14:11:58 +010030#define GFS2_SMALL_FH_SIZE 4
Wendy Cheng35dcc522007-06-27 17:07:53 -040031#define GFS2_LARGE_FH_SIZE 8
Steven Whitehouse3ebf4492007-07-10 12:28:27 +010032#define GFS2_OLD_FH_SIZE 10
Steven Whitehousebb8d8a62007-06-01 14:11:58 +010033
Al Virob44b84d2006-10-14 10:46:30 -040034static int gfs2_encode_fh(struct dentry *dentry, __u32 *p, int *len,
David Teiglandb3b94fa2006-01-16 16:50:04 +000035 int connectable)
36{
Al Virob44b84d2006-10-14 10:46:30 -040037 __be32 *fh = (__force __be32 *)p;
David Teiglandb3b94fa2006-01-16 16:50:04 +000038 struct inode *inode = dentry->d_inode;
Steven Whitehousec9fd4302006-03-01 15:31:02 -050039 struct super_block *sb = inode->i_sb;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040040 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +000041
Steven Whitehouse5acd3962006-09-04 16:16:45 -040042 if (*len < GFS2_SMALL_FH_SIZE ||
43 (connectable && *len < GFS2_LARGE_FH_SIZE))
David Teiglandb3b94fa2006-01-16 16:50:04 +000044 return 255;
45
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
Steven Whitehousec9fd4302006-03-01 15:31:02 -050052 if (!connectable || inode == sb->s_root->d_inode)
David Teiglandb3b94fa2006-01-16 16:50:04 +000053 return *len;
54
55 spin_lock(&dentry->d_lock);
56 inode = dentry->d_parent->d_inode;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040057 ip = GFS2_I(inode);
58 igrab(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +000059 spin_unlock(&dentry->d_lock);
60
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010061 fh[4] = cpu_to_be32(ip->i_no_formal_ino >> 32);
62 fh[5] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
63 fh[6] = cpu_to_be32(ip->i_no_addr >> 32);
64 fh[7] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
Steven Whitehouse5acd3962006-09-04 16:16:45 -040065 *len = GFS2_LARGE_FH_SIZE;
David Teiglandb3b94fa2006-01-16 16:50:04 +000066
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040067 iput(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +000068
69 return *len;
70}
71
72struct get_name_filldir {
Al Viro629a21e2006-10-13 22:51:24 -040073 struct gfs2_inum_host inum;
David Teiglandb3b94fa2006-01-16 16:50:04 +000074 char *name;
75};
76
Steven Whitehouse3699e3a2007-01-17 15:09:20 +000077static int get_name_filldir(void *opaque, const char *name, int length,
78 loff_t offset, u64 inum, unsigned int type)
David Teiglandb3b94fa2006-01-16 16:50:04 +000079{
Steven Whitehouse3699e3a2007-01-17 15:09:20 +000080 struct get_name_filldir *gnfd = opaque;
David Teiglandb3b94fa2006-01-16 16:50:04 +000081
Steven Whitehouse3699e3a2007-01-17 15:09:20 +000082 if (inum != gnfd->inum.no_addr)
David Teiglandb3b94fa2006-01-16 16:50:04 +000083 return 0;
84
85 memcpy(gnfd->name, name, length);
86 gnfd->name[length] = 0;
87
88 return 1;
89}
90
91static int gfs2_get_name(struct dentry *parent, char *name,
92 struct dentry *child)
93{
94 struct inode *dir = parent->d_inode;
95 struct inode *inode = child->d_inode;
96 struct gfs2_inode *dip, *ip;
97 struct get_name_filldir gnfd;
98 struct gfs2_holder gh;
Steven Whitehousecd915492006-09-04 12:49:07 -040099 u64 offset = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000100 int error;
101
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 gnfd.name = name;
115
116 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh);
117 if (error)
118 return error;
119
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500120 error = gfs2_dir_read(dir, &offset, &gnfd, get_name_filldir);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000121
122 gfs2_glock_dq_uninit(&gh);
123
124 if (!error && !*name)
125 error = -ENOENT;
126
127 return error;
128}
129
130static struct dentry *gfs2_get_parent(struct dentry *child)
131{
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500132 struct qstr dotdot;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000133 struct inode *inode;
134 struct dentry *dentry;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000135
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500136 gfs2_str2qstr(&dotdot, "..");
Steven Whitehousec7526662006-03-20 12:30:04 -0500137 inode = gfs2_lookupi(child->d_inode, &dotdot, 1, NULL);
138
139 if (!inode)
140 return ERR_PTR(-ENOENT);
Steven Whitehouse7b625362006-09-05 15:56:17 -0400141 /*
142 * In case of an error, @inode carries the error value, and we
143 * have to return that as a(n invalid) pointer to dentry.
144 */
Steven Whitehousec7526662006-03-20 12:30:04 -0500145 if (IS_ERR(inode))
146 return ERR_PTR(PTR_ERR(inode));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000147
David Teiglandb3b94fa2006-01-16 16:50:04 +0000148 dentry = d_alloc_anon(inode);
149 if (!dentry) {
150 iput(inode);
151 return ERR_PTR(-ENOMEM);
152 }
153
Robert Peterson70831462007-01-11 13:25:00 -0600154 dentry->d_op = &gfs2_dops;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000155 return dentry;
156}
157
Christoph Hellwig34c0d152007-10-21 16:42:14 -0700158static struct dentry *gfs2_get_dentry(struct super_block *sb,
159 struct gfs2_inum_host *inum)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000160{
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500161 struct gfs2_sbd *sdp = sb->s_fs_info;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000162 struct gfs2_holder i_gh, ri_gh, rgd_gh;
163 struct gfs2_rgrpd *rgd;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000164 struct inode *inode;
165 struct dentry *dentry;
166 int error;
167
David Teiglandb3b94fa2006-01-16 16:50:04 +0000168 /* System files? */
169
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100170 inode = gfs2_ilookup(sb, inum->no_addr);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000171 if (inode) {
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100172 if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000173 iput(inode);
174 return ERR_PTR(-ESTALE);
175 }
176 goto out_inode;
177 }
178
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400179 error = gfs2_glock_nq_num(sdp, inum->no_addr, &gfs2_inode_glops,
Steven Whitehouse1c0f4872007-01-22 12:10:39 -0500180 LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000181 if (error)
182 return ERR_PTR(error);
183
David Teiglandb3b94fa2006-01-16 16:50:04 +0000184 error = gfs2_rindex_hold(sdp, &ri_gh);
185 if (error)
186 goto fail;
187
188 error = -EINVAL;
189 rgd = gfs2_blk2rgrpd(sdp, inum->no_addr);
190 if (!rgd)
191 goto fail_rindex;
192
193 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_SHARED, 0, &rgd_gh);
194 if (error)
195 goto fail_rindex;
196
197 error = -ESTALE;
198 if (gfs2_get_block_type(rgd, inum->no_addr) != GFS2_BLKST_DINODE)
199 goto fail_rgd;
200
201 gfs2_glock_dq_uninit(&rgd_gh);
202 gfs2_glock_dq_uninit(&ri_gh);
203
Wendy Cheng35dcc522007-06-27 17:07:53 -0400204 inode = gfs2_inode_lookup(sb, DT_UNKNOWN,
Wendy Chengbb9bcf02007-06-27 17:07:08 -0400205 inum->no_addr,
Benjamin Marzinski7a9f53b2007-09-18 13:33:18 -0500206 0, 0);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400207 if (!inode)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000208 goto fail;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400209 if (IS_ERR(inode)) {
210 error = PTR_ERR(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000211 goto fail;
212 }
213
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400214 error = gfs2_inode_refresh(GFS2_I(inode));
215 if (error) {
216 iput(inode);
217 goto fail;
218 }
Wendy Cheng35dcc522007-06-27 17:07:53 -0400219
220 /* Pick up the works we bypass in gfs2_inode_lookup */
221 if (inode->i_state & I_NEW)
222 gfs2_set_iop(inode);
223
Steven Whitehousedbb7cae2007-05-15 15:37:50 +0100224 if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) {
225 iput(inode);
226 goto fail;
227 }
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400228
David Teiglandb3b94fa2006-01-16 16:50:04 +0000229 error = -EIO;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400230 if (GFS2_I(inode)->i_di.di_flags & GFS2_DIF_SYSTEM) {
231 iput(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000232 goto fail;
233 }
234
235 gfs2_glock_dq_uninit(&i_gh);
236
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400237out_inode:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000238 dentry = d_alloc_anon(inode);
239 if (!dentry) {
240 iput(inode);
241 return ERR_PTR(-ENOMEM);
242 }
243
Robert Peterson70831462007-01-11 13:25:00 -0600244 dentry->d_op = &gfs2_dops;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000245 return dentry;
246
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400247fail_rgd:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000248 gfs2_glock_dq_uninit(&rgd_gh);
249
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400250fail_rindex:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000251 gfs2_glock_dq_uninit(&ri_gh);
252
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400253fail:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000254 gfs2_glock_dq_uninit(&i_gh);
255 return ERR_PTR(error);
256}
257
Christoph Hellwig34c0d152007-10-21 16:42:14 -0700258static struct dentry *gfs2_fh_to_dentry(struct super_block *sb, struct fid *fid,
259 int fh_len, int fh_type)
260{
261 struct gfs2_inum_host this;
262 __be32 *fh = (__force __be32 *)fid->raw;
263
264 switch (fh_type) {
265 case GFS2_SMALL_FH_SIZE:
266 case GFS2_LARGE_FH_SIZE:
267 case GFS2_OLD_FH_SIZE:
268 this.no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32;
269 this.no_formal_ino |= be32_to_cpu(fh[1]);
270 this.no_addr = ((u64)be32_to_cpu(fh[2])) << 32;
271 this.no_addr |= be32_to_cpu(fh[3]);
272 return gfs2_get_dentry(sb, &this);
273 default:
274 return NULL;
275 }
276}
277
278static struct dentry *gfs2_fh_to_parent(struct super_block *sb, struct fid *fid,
279 int fh_len, int fh_type)
280{
281 struct gfs2_inum_host parent;
282 __be32 *fh = (__force __be32 *)fid->raw;
283
284 switch (fh_type) {
285 case GFS2_LARGE_FH_SIZE:
286 case GFS2_OLD_FH_SIZE:
287 parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32;
288 parent.no_formal_ino |= be32_to_cpu(fh[5]);
289 parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32;
290 parent.no_addr |= be32_to_cpu(fh[7]);
291 return gfs2_get_dentry(sb, &parent);
292 default:
293 return NULL;
294 }
295}
296
David Teiglandb3b94fa2006-01-16 16:50:04 +0000297struct export_operations gfs2_export_ops = {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000298 .encode_fh = gfs2_encode_fh,
Christoph Hellwig34c0d152007-10-21 16:42:14 -0700299 .fh_to_dentry = gfs2_fh_to_dentry,
300 .fh_to_parent = gfs2_fh_to_parent,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000301 .get_name = gfs2_get_name,
302 .get_parent = gfs2_get_parent,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000303};
304