blob: c94cbc8b6ef60a8b77e0dd7696daa0313c1d631c [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
10#include <linux/sched.h>
11#include <linux/slab.h>
12#include <linux/spinlock.h>
13#include <linux/completion.h>
14#include <linux/buffer_head.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>
David Teiglandb3b94fa2006-01-16 16:50:04 +000017
18#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050019#include "lm_interface.h"
20#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"
25#include "ops_export.h"
26#include "rgrp.h"
Steven Whitehousec7526662006-03-20 12:30:04 -050027#include "util.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000028
29static struct dentry *gfs2_decode_fh(struct super_block *sb,
30 __u32 *fh,
31 int fh_len,
32 int fh_type,
33 int (*acceptable)(void *context,
34 struct dentry *dentry),
35 void *context)
36{
Wendy Cheng2eb168c2006-07-11 13:28:53 -040037 struct gfs2_fh_obj fh_obj;
38 struct gfs2_inum *this, parent;
David Teiglandb3b94fa2006-01-16 16:50:04 +000039
David Teiglandb3b94fa2006-01-16 16:50:04 +000040 if (fh_type != fh_len)
41 return NULL;
42
Wendy Cheng2eb168c2006-07-11 13:28:53 -040043 this = &fh_obj.this;
44 fh_obj.imode = DT_UNKNOWN;
David Teiglandb3b94fa2006-01-16 16:50:04 +000045 memset(&parent, 0, sizeof(struct gfs2_inum));
46
47 switch (fh_type) {
Wendy Cheng2eb168c2006-07-11 13:28:53 -040048 case 10:
David Teiglandb3b94fa2006-01-16 16:50:04 +000049 parent.no_formal_ino = ((uint64_t)be32_to_cpu(fh[4])) << 32;
50 parent.no_formal_ino |= be32_to_cpu(fh[5]);
51 parent.no_addr = ((uint64_t)be32_to_cpu(fh[6])) << 32;
52 parent.no_addr |= be32_to_cpu(fh[7]);
Wendy Cheng2eb168c2006-07-11 13:28:53 -040053 fh_obj.imode = be32_to_cpu(fh[8]);
David Teiglandb3b94fa2006-01-16 16:50:04 +000054 case 4:
Wendy Cheng2eb168c2006-07-11 13:28:53 -040055 this->no_formal_ino = ((uint64_t)be32_to_cpu(fh[0])) << 32;
56 this->no_formal_ino |= be32_to_cpu(fh[1]);
57 this->no_addr = ((uint64_t)be32_to_cpu(fh[2])) << 32;
58 this->no_addr |= be32_to_cpu(fh[3]);
David Teiglandb3b94fa2006-01-16 16:50:04 +000059 break;
60 default:
61 return NULL;
62 }
63
Wendy Cheng2eb168c2006-07-11 13:28:53 -040064 return gfs2_export_ops.find_exported_dentry(sb, &fh_obj, &parent,
David Teiglandb3b94fa2006-01-16 16:50:04 +000065 acceptable, context);
66}
67
68static int gfs2_encode_fh(struct dentry *dentry, __u32 *fh, int *len,
69 int connectable)
70{
71 struct inode *inode = dentry->d_inode;
Steven Whitehousec9fd4302006-03-01 15:31:02 -050072 struct super_block *sb = inode->i_sb;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040073 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +000074
Wendy Cheng2eb168c2006-07-11 13:28:53 -040075 if (*len < 4 || (connectable && *len < 10))
David Teiglandb3b94fa2006-01-16 16:50:04 +000076 return 255;
77
78 fh[0] = ip->i_num.no_formal_ino >> 32;
79 fh[0] = cpu_to_be32(fh[0]);
80 fh[1] = ip->i_num.no_formal_ino & 0xFFFFFFFF;
81 fh[1] = cpu_to_be32(fh[1]);
82 fh[2] = ip->i_num.no_addr >> 32;
83 fh[2] = cpu_to_be32(fh[2]);
84 fh[3] = ip->i_num.no_addr & 0xFFFFFFFF;
85 fh[3] = cpu_to_be32(fh[3]);
86 *len = 4;
87
Steven Whitehousec9fd4302006-03-01 15:31:02 -050088 if (!connectable || inode == sb->s_root->d_inode)
David Teiglandb3b94fa2006-01-16 16:50:04 +000089 return *len;
90
91 spin_lock(&dentry->d_lock);
92 inode = dentry->d_parent->d_inode;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040093 ip = GFS2_I(inode);
94 igrab(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +000095 spin_unlock(&dentry->d_lock);
96
97 fh[4] = ip->i_num.no_formal_ino >> 32;
98 fh[4] = cpu_to_be32(fh[4]);
99 fh[5] = ip->i_num.no_formal_ino & 0xFFFFFFFF;
100 fh[5] = cpu_to_be32(fh[5]);
101 fh[6] = ip->i_num.no_addr >> 32;
102 fh[6] = cpu_to_be32(fh[6]);
103 fh[7] = ip->i_num.no_addr & 0xFFFFFFFF;
104 fh[7] = cpu_to_be32(fh[7]);
Wendy Cheng2eb168c2006-07-11 13:28:53 -0400105
106 fh[8] = cpu_to_be32(inode->i_mode);
107 fh[9] = 0; /* pad to double word */
108 *len = 10;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000109
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400110 iput(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000111
112 return *len;
113}
114
115struct get_name_filldir {
116 struct gfs2_inum inum;
117 char *name;
118};
119
120static int get_name_filldir(void *opaque, const char *name, unsigned int length,
121 uint64_t offset, struct gfs2_inum *inum,
122 unsigned int type)
123{
124 struct get_name_filldir *gnfd = (struct get_name_filldir *)opaque;
125
126 if (!gfs2_inum_equal(inum, &gnfd->inum))
127 return 0;
128
129 memcpy(gnfd->name, name, length);
130 gnfd->name[length] = 0;
131
132 return 1;
133}
134
135static int gfs2_get_name(struct dentry *parent, char *name,
136 struct dentry *child)
137{
138 struct inode *dir = parent->d_inode;
139 struct inode *inode = child->d_inode;
140 struct gfs2_inode *dip, *ip;
141 struct get_name_filldir gnfd;
142 struct gfs2_holder gh;
143 uint64_t offset = 0;
144 int error;
145
146 if (!dir)
147 return -EINVAL;
148
David Teiglandb3b94fa2006-01-16 16:50:04 +0000149 if (!S_ISDIR(dir->i_mode) || !inode)
150 return -EINVAL;
151
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400152 dip = GFS2_I(dir);
153 ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000154
155 *name = 0;
156 gnfd.inum = ip->i_num;
157 gnfd.name = name;
158
159 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh);
160 if (error)
161 return error;
162
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500163 error = gfs2_dir_read(dir, &offset, &gnfd, get_name_filldir);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000164
165 gfs2_glock_dq_uninit(&gh);
166
167 if (!error && !*name)
168 error = -ENOENT;
169
170 return error;
171}
172
173static struct dentry *gfs2_get_parent(struct dentry *child)
174{
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500175 struct qstr dotdot;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000176 struct inode *inode;
177 struct dentry *dentry;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000178
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500179 gfs2_str2qstr(&dotdot, "..");
Steven Whitehousec7526662006-03-20 12:30:04 -0500180 inode = gfs2_lookupi(child->d_inode, &dotdot, 1, NULL);
181
182 if (!inode)
183 return ERR_PTR(-ENOENT);
184 if (IS_ERR(inode))
185 return ERR_PTR(PTR_ERR(inode));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000186
David Teiglandb3b94fa2006-01-16 16:50:04 +0000187 dentry = d_alloc_anon(inode);
188 if (!dentry) {
189 iput(inode);
190 return ERR_PTR(-ENOMEM);
191 }
192
193 return dentry;
194}
195
Wendy Cheng2eb168c2006-07-11 13:28:53 -0400196static struct dentry *gfs2_get_dentry(struct super_block *sb, void *inum_obj)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000197{
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500198 struct gfs2_sbd *sdp = sb->s_fs_info;
Wendy Cheng2eb168c2006-07-11 13:28:53 -0400199 struct gfs2_fh_obj *fh_obj = (struct gfs2_fh_obj *)inum_obj;
200 struct gfs2_inum *inum = &fh_obj->this;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000201 struct gfs2_holder i_gh, ri_gh, rgd_gh;
202 struct gfs2_rgrpd *rgd;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000203 struct inode *inode;
204 struct dentry *dentry;
205 int error;
206
David Teiglandb3b94fa2006-01-16 16:50:04 +0000207 /* System files? */
208
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400209 inode = gfs2_ilookup(sb, inum);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000210 if (inode) {
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400211 if (GFS2_I(inode)->i_num.no_formal_ino != inum->no_formal_ino) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000212 iput(inode);
213 return ERR_PTR(-ESTALE);
214 }
215 goto out_inode;
216 }
217
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400218 error = gfs2_glock_nq_num(sdp, inum->no_addr, &gfs2_inode_glops,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000219 LM_ST_SHARED, LM_FLAG_ANY | GL_LOCAL_EXCL,
220 &i_gh);
221 if (error)
222 return ERR_PTR(error);
223
David Teiglandb3b94fa2006-01-16 16:50:04 +0000224 error = gfs2_rindex_hold(sdp, &ri_gh);
225 if (error)
226 goto fail;
227
228 error = -EINVAL;
229 rgd = gfs2_blk2rgrpd(sdp, inum->no_addr);
230 if (!rgd)
231 goto fail_rindex;
232
233 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_SHARED, 0, &rgd_gh);
234 if (error)
235 goto fail_rindex;
236
237 error = -ESTALE;
238 if (gfs2_get_block_type(rgd, inum->no_addr) != GFS2_BLKST_DINODE)
239 goto fail_rgd;
240
241 gfs2_glock_dq_uninit(&rgd_gh);
242 gfs2_glock_dq_uninit(&ri_gh);
243
Wendy Cheng2eb168c2006-07-11 13:28:53 -0400244 inode = gfs2_inode_lookup(sb, inum, fh_obj->imode);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400245 if (!inode)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000246 goto fail;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400247 if (IS_ERR(inode)) {
248 error = PTR_ERR(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000249 goto fail;
250 }
251
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400252 error = gfs2_inode_refresh(GFS2_I(inode));
253 if (error) {
254 iput(inode);
255 goto fail;
256 }
257
David Teiglandb3b94fa2006-01-16 16:50:04 +0000258 error = -EIO;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400259 if (GFS2_I(inode)->i_di.di_flags & GFS2_DIF_SYSTEM) {
260 iput(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000261 goto fail;
262 }
263
264 gfs2_glock_dq_uninit(&i_gh);
265
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400266out_inode:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000267 dentry = d_alloc_anon(inode);
268 if (!dentry) {
269 iput(inode);
270 return ERR_PTR(-ENOMEM);
271 }
272
273 return dentry;
274
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400275fail_rgd:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000276 gfs2_glock_dq_uninit(&rgd_gh);
277
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400278fail_rindex:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000279 gfs2_glock_dq_uninit(&ri_gh);
280
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400281fail:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000282 gfs2_glock_dq_uninit(&i_gh);
283 return ERR_PTR(error);
284}
285
286struct export_operations gfs2_export_ops = {
287 .decode_fh = gfs2_decode_fh,
288 .encode_fh = gfs2_encode_fh,
289 .get_name = gfs2_get_name,
290 .get_parent = gfs2_get_parent,
291 .get_dentry = gfs2_get_dentry,
292};
293