blob: b27bce74a795ff6627ac941f75f60da2bad6f305 [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License v.2.
8 */
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>
David Teiglandb3b94fa2006-01-16 16:50:04 +000016#include <asm/semaphore.h>
17
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{
37 struct gfs2_inum this, parent;
38
David Teiglandb3b94fa2006-01-16 16:50:04 +000039 if (fh_type != fh_len)
40 return NULL;
41
42 memset(&parent, 0, sizeof(struct gfs2_inum));
43
44 switch (fh_type) {
45 case 8:
46 parent.no_formal_ino = ((uint64_t)be32_to_cpu(fh[4])) << 32;
47 parent.no_formal_ino |= be32_to_cpu(fh[5]);
48 parent.no_addr = ((uint64_t)be32_to_cpu(fh[6])) << 32;
49 parent.no_addr |= be32_to_cpu(fh[7]);
50 case 4:
51 this.no_formal_ino = ((uint64_t)be32_to_cpu(fh[0])) << 32;
52 this.no_formal_ino |= be32_to_cpu(fh[1]);
53 this.no_addr = ((uint64_t)be32_to_cpu(fh[2])) << 32;
54 this.no_addr |= be32_to_cpu(fh[3]);
55 break;
56 default:
57 return NULL;
58 }
59
60 return gfs2_export_ops.find_exported_dentry(sb, &this, &parent,
61 acceptable, context);
62}
63
64static int gfs2_encode_fh(struct dentry *dentry, __u32 *fh, int *len,
65 int connectable)
66{
67 struct inode *inode = dentry->d_inode;
Steven Whitehousec9fd4302006-03-01 15:31:02 -050068 struct super_block *sb = inode->i_sb;
Steven Whitehouse5c676f62006-02-27 17:23:27 -050069 struct gfs2_inode *ip = inode->u.generic_ip;
David Teiglandb3b94fa2006-01-16 16:50:04 +000070
David Teiglandb3b94fa2006-01-16 16:50:04 +000071 if (*len < 4 || (connectable && *len < 8))
72 return 255;
73
74 fh[0] = ip->i_num.no_formal_ino >> 32;
75 fh[0] = cpu_to_be32(fh[0]);
76 fh[1] = ip->i_num.no_formal_ino & 0xFFFFFFFF;
77 fh[1] = cpu_to_be32(fh[1]);
78 fh[2] = ip->i_num.no_addr >> 32;
79 fh[2] = cpu_to_be32(fh[2]);
80 fh[3] = ip->i_num.no_addr & 0xFFFFFFFF;
81 fh[3] = cpu_to_be32(fh[3]);
82 *len = 4;
83
Steven Whitehousec9fd4302006-03-01 15:31:02 -050084 if (!connectable || inode == sb->s_root->d_inode)
David Teiglandb3b94fa2006-01-16 16:50:04 +000085 return *len;
86
87 spin_lock(&dentry->d_lock);
88 inode = dentry->d_parent->d_inode;
Steven Whitehouse5c676f62006-02-27 17:23:27 -050089 ip = inode->u.generic_ip;
David Teiglandb3b94fa2006-01-16 16:50:04 +000090 gfs2_inode_hold(ip);
91 spin_unlock(&dentry->d_lock);
92
93 fh[4] = ip->i_num.no_formal_ino >> 32;
94 fh[4] = cpu_to_be32(fh[4]);
95 fh[5] = ip->i_num.no_formal_ino & 0xFFFFFFFF;
96 fh[5] = cpu_to_be32(fh[5]);
97 fh[6] = ip->i_num.no_addr >> 32;
98 fh[6] = cpu_to_be32(fh[6]);
99 fh[7] = ip->i_num.no_addr & 0xFFFFFFFF;
100 fh[7] = cpu_to_be32(fh[7]);
101 *len = 8;
102
103 gfs2_inode_put(ip);
104
105 return *len;
106}
107
108struct get_name_filldir {
109 struct gfs2_inum inum;
110 char *name;
111};
112
113static int get_name_filldir(void *opaque, const char *name, unsigned int length,
114 uint64_t offset, struct gfs2_inum *inum,
115 unsigned int type)
116{
117 struct get_name_filldir *gnfd = (struct get_name_filldir *)opaque;
118
119 if (!gfs2_inum_equal(inum, &gnfd->inum))
120 return 0;
121
122 memcpy(gnfd->name, name, length);
123 gnfd->name[length] = 0;
124
125 return 1;
126}
127
128static int gfs2_get_name(struct dentry *parent, char *name,
129 struct dentry *child)
130{
131 struct inode *dir = parent->d_inode;
132 struct inode *inode = child->d_inode;
133 struct gfs2_inode *dip, *ip;
134 struct get_name_filldir gnfd;
135 struct gfs2_holder gh;
136 uint64_t offset = 0;
137 int error;
138
139 if (!dir)
140 return -EINVAL;
141
David Teiglandb3b94fa2006-01-16 16:50:04 +0000142 if (!S_ISDIR(dir->i_mode) || !inode)
143 return -EINVAL;
144
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500145 dip = dir->u.generic_ip;
146 ip = inode->u.generic_ip;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000147
148 *name = 0;
149 gnfd.inum = ip->i_num;
150 gnfd.name = name;
151
152 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh);
153 if (error)
154 return error;
155
156 error = gfs2_dir_read(dip, &offset, &gnfd, get_name_filldir);
157
158 gfs2_glock_dq_uninit(&gh);
159
160 if (!error && !*name)
161 error = -ENOENT;
162
163 return error;
164}
165
166static struct dentry *gfs2_get_parent(struct dentry *child)
167{
David Teiglandb3b94fa2006-01-16 16:50:04 +0000168 struct qstr dotdot = { .name = "..", .len = 2 };
David Teiglandb3b94fa2006-01-16 16:50:04 +0000169 struct inode *inode;
170 struct dentry *dentry;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000171
Steven Whitehousec7526662006-03-20 12:30:04 -0500172 dotdot.hash = gfs2_disk_hash(dotdot.name, dotdot.len);
173
174 inode = gfs2_lookupi(child->d_inode, &dotdot, 1, NULL);
175
176 if (!inode)
177 return ERR_PTR(-ENOENT);
178 if (IS_ERR(inode))
179 return ERR_PTR(PTR_ERR(inode));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000180
David Teiglandb3b94fa2006-01-16 16:50:04 +0000181 dentry = d_alloc_anon(inode);
182 if (!dentry) {
183 iput(inode);
184 return ERR_PTR(-ENOMEM);
185 }
186
187 return dentry;
188}
189
190static struct dentry *gfs2_get_dentry(struct super_block *sb, void *inum_p)
191{
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500192 struct gfs2_sbd *sdp = sb->s_fs_info;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000193 struct gfs2_inum *inum = (struct gfs2_inum *)inum_p;
194 struct gfs2_holder i_gh, ri_gh, rgd_gh;
195 struct gfs2_rgrpd *rgd;
196 struct gfs2_inode *ip;
197 struct inode *inode;
198 struct dentry *dentry;
199 int error;
200
David Teiglandb3b94fa2006-01-16 16:50:04 +0000201 /* System files? */
202
203 inode = gfs2_iget(sb, inum);
204 if (inode) {
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500205 ip = inode->u.generic_ip;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000206 if (ip->i_num.no_formal_ino != inum->no_formal_ino) {
207 iput(inode);
208 return ERR_PTR(-ESTALE);
209 }
210 goto out_inode;
211 }
212
213 error = gfs2_glock_nq_num(sdp,
214 inum->no_addr, &gfs2_inode_glops,
215 LM_ST_SHARED, LM_FLAG_ANY | GL_LOCAL_EXCL,
216 &i_gh);
217 if (error)
218 return ERR_PTR(error);
219
220 error = gfs2_inode_get(i_gh.gh_gl, inum, NO_CREATE, &ip);
221 if (error)
222 goto fail;
223 if (ip)
224 goto out_ip;
225
226 error = gfs2_rindex_hold(sdp, &ri_gh);
227 if (error)
228 goto fail;
229
230 error = -EINVAL;
231 rgd = gfs2_blk2rgrpd(sdp, inum->no_addr);
232 if (!rgd)
233 goto fail_rindex;
234
235 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_SHARED, 0, &rgd_gh);
236 if (error)
237 goto fail_rindex;
238
239 error = -ESTALE;
240 if (gfs2_get_block_type(rgd, inum->no_addr) != GFS2_BLKST_DINODE)
241 goto fail_rgd;
242
243 gfs2_glock_dq_uninit(&rgd_gh);
244 gfs2_glock_dq_uninit(&ri_gh);
245
246 error = gfs2_inode_get(i_gh.gh_gl, inum, CREATE, &ip);
247 if (error)
248 goto fail;
249
250 error = gfs2_inode_refresh(ip);
251 if (error) {
252 gfs2_inode_put(ip);
253 goto fail;
254 }
255
David Teiglandb3b94fa2006-01-16 16:50:04 +0000256 out_ip:
257 error = -EIO;
258 if (ip->i_di.di_flags & GFS2_DIF_SYSTEM) {
259 gfs2_inode_put(ip);
260 goto fail;
261 }
262
263 gfs2_glock_dq_uninit(&i_gh);
264
265 inode = gfs2_ip2v(ip);
266 gfs2_inode_put(ip);
267
268 if (!inode)
269 return ERR_PTR(-ENOMEM);
270
271 out_inode:
272 dentry = d_alloc_anon(inode);
273 if (!dentry) {
274 iput(inode);
275 return ERR_PTR(-ENOMEM);
276 }
277
278 return dentry;
279
280 fail_rgd:
281 gfs2_glock_dq_uninit(&rgd_gh);
282
283 fail_rindex:
284 gfs2_glock_dq_uninit(&ri_gh);
285
286 fail:
287 gfs2_glock_dq_uninit(&i_gh);
288 return ERR_PTR(error);
289}
290
291struct export_operations gfs2_export_ops = {
292 .decode_fh = gfs2_decode_fh,
293 .encode_fh = gfs2_encode_fh,
294 .get_name = gfs2_get_name,
295 .get_parent = gfs2_get_parent,
296 .get_dentry = gfs2_get_dentry,
297};
298