Commit | Line | Data |
---|---|---|
b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3a8a9a10 | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
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> | |
5c676f6d | 15 | #include <linux/gfs2_ondisk.h> |
71b86f56 | 16 | #include <linux/crc32.h> |
b3b94faa DT |
17 | |
18 | #include "gfs2.h" | |
5c676f6d SW |
19 | #include "lm_interface.h" |
20 | #include "incore.h" | |
b3b94faa DT |
21 | #include "dir.h" |
22 | #include "glock.h" | |
23 | #include "glops.h" | |
24 | #include "inode.h" | |
25 | #include "ops_export.h" | |
26 | #include "rgrp.h" | |
c752666c | 27 | #include "util.h" |
b3b94faa DT |
28 | |
29 | static 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 | ||
b3b94faa DT |
39 | 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 | ||
64 | static int gfs2_encode_fh(struct dentry *dentry, __u32 *fh, int *len, | |
65 | int connectable) | |
66 | { | |
67 | struct inode *inode = dentry->d_inode; | |
c9fd4307 | 68 | struct super_block *sb = inode->i_sb; |
feaa7bba | 69 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa | 70 | |
b3b94faa DT |
71 | 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 | ||
c9fd4307 | 84 | if (!connectable || inode == sb->s_root->d_inode) |
b3b94faa DT |
85 | return *len; |
86 | ||
87 | spin_lock(&dentry->d_lock); | |
88 | inode = dentry->d_parent->d_inode; | |
feaa7bba SW |
89 | ip = GFS2_I(inode); |
90 | igrab(inode); | |
b3b94faa DT |
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 | ||
feaa7bba | 103 | iput(inode); |
b3b94faa DT |
104 | |
105 | return *len; | |
106 | } | |
107 | ||
108 | struct get_name_filldir { | |
109 | struct gfs2_inum inum; | |
110 | char *name; | |
111 | }; | |
112 | ||
113 | static 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 | ||
128 | static 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 | ||
b3b94faa DT |
142 | if (!S_ISDIR(dir->i_mode) || !inode) |
143 | return -EINVAL; | |
144 | ||
feaa7bba SW |
145 | dip = GFS2_I(dir); |
146 | ip = GFS2_I(inode); | |
b3b94faa DT |
147 | |
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 | ||
71b86f56 | 156 | error = gfs2_dir_read(dir, &offset, &gnfd, get_name_filldir); |
b3b94faa DT |
157 | |
158 | gfs2_glock_dq_uninit(&gh); | |
159 | ||
160 | if (!error && !*name) | |
161 | error = -ENOENT; | |
162 | ||
163 | return error; | |
164 | } | |
165 | ||
166 | static struct dentry *gfs2_get_parent(struct dentry *child) | |
167 | { | |
71b86f56 | 168 | struct qstr dotdot; |
b3b94faa DT |
169 | struct inode *inode; |
170 | struct dentry *dentry; | |
b3b94faa | 171 | |
71b86f56 | 172 | gfs2_str2qstr(&dotdot, ".."); |
c752666c SW |
173 | inode = gfs2_lookupi(child->d_inode, &dotdot, 1, NULL); |
174 | ||
175 | if (!inode) | |
176 | return ERR_PTR(-ENOENT); | |
177 | if (IS_ERR(inode)) | |
178 | return ERR_PTR(PTR_ERR(inode)); | |
b3b94faa | 179 | |
b3b94faa DT |
180 | dentry = d_alloc_anon(inode); |
181 | if (!dentry) { | |
182 | iput(inode); | |
183 | return ERR_PTR(-ENOMEM); | |
184 | } | |
185 | ||
186 | return dentry; | |
187 | } | |
188 | ||
189 | static struct dentry *gfs2_get_dentry(struct super_block *sb, void *inum_p) | |
190 | { | |
5c676f6d | 191 | struct gfs2_sbd *sdp = sb->s_fs_info; |
feaa7bba | 192 | struct gfs2_inum *inum = inum_p; |
b3b94faa DT |
193 | struct gfs2_holder i_gh, ri_gh, rgd_gh; |
194 | struct gfs2_rgrpd *rgd; | |
b3b94faa DT |
195 | struct inode *inode; |
196 | struct dentry *dentry; | |
197 | int error; | |
198 | ||
b3b94faa DT |
199 | /* System files? */ |
200 | ||
feaa7bba | 201 | inode = gfs2_ilookup(sb, inum); |
b3b94faa | 202 | if (inode) { |
feaa7bba | 203 | if (GFS2_I(inode)->i_num.no_formal_ino != inum->no_formal_ino) { |
b3b94faa DT |
204 | iput(inode); |
205 | return ERR_PTR(-ESTALE); | |
206 | } | |
207 | goto out_inode; | |
208 | } | |
209 | ||
feaa7bba | 210 | error = gfs2_glock_nq_num(sdp, inum->no_addr, &gfs2_inode_glops, |
b3b94faa DT |
211 | LM_ST_SHARED, LM_FLAG_ANY | GL_LOCAL_EXCL, |
212 | &i_gh); | |
213 | if (error) | |
214 | return ERR_PTR(error); | |
215 | ||
b3b94faa DT |
216 | error = gfs2_rindex_hold(sdp, &ri_gh); |
217 | if (error) | |
218 | goto fail; | |
219 | ||
220 | error = -EINVAL; | |
221 | rgd = gfs2_blk2rgrpd(sdp, inum->no_addr); | |
222 | if (!rgd) | |
223 | goto fail_rindex; | |
224 | ||
225 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_SHARED, 0, &rgd_gh); | |
226 | if (error) | |
227 | goto fail_rindex; | |
228 | ||
229 | error = -ESTALE; | |
230 | if (gfs2_get_block_type(rgd, inum->no_addr) != GFS2_BLKST_DINODE) | |
231 | goto fail_rgd; | |
232 | ||
233 | gfs2_glock_dq_uninit(&rgd_gh); | |
234 | gfs2_glock_dq_uninit(&ri_gh); | |
235 | ||
feaa7bba SW |
236 | inode = gfs2_inode_lookup(sb, inum, DT_UNKNOWN); |
237 | if (!inode) | |
238 | goto fail; | |
239 | if (IS_ERR(inode)) { | |
240 | error = PTR_ERR(inode); | |
b3b94faa | 241 | goto fail; |
feaa7bba | 242 | } |
b3b94faa | 243 | |
feaa7bba | 244 | error = gfs2_inode_refresh(GFS2_I(inode)); |
b3b94faa | 245 | if (error) { |
feaa7bba | 246 | iput(inode); |
b3b94faa DT |
247 | goto fail; |
248 | } | |
249 | ||
b3b94faa | 250 | error = -EIO; |
feaa7bba SW |
251 | if (GFS2_I(inode)->i_di.di_flags & GFS2_DIF_SYSTEM) { |
252 | iput(inode); | |
b3b94faa DT |
253 | goto fail; |
254 | } | |
255 | ||
256 | gfs2_glock_dq_uninit(&i_gh); | |
257 | ||
feaa7bba | 258 | out_inode: |
b3b94faa DT |
259 | dentry = d_alloc_anon(inode); |
260 | if (!dentry) { | |
261 | iput(inode); | |
262 | return ERR_PTR(-ENOMEM); | |
263 | } | |
264 | ||
265 | return dentry; | |
266 | ||
feaa7bba | 267 | fail_rgd: |
b3b94faa DT |
268 | gfs2_glock_dq_uninit(&rgd_gh); |
269 | ||
feaa7bba | 270 | fail_rindex: |
b3b94faa DT |
271 | gfs2_glock_dq_uninit(&ri_gh); |
272 | ||
feaa7bba | 273 | fail: |
b3b94faa DT |
274 | gfs2_glock_dq_uninit(&i_gh); |
275 | return ERR_PTR(error); | |
276 | } | |
277 | ||
278 | struct export_operations gfs2_export_ops = { | |
279 | .decode_fh = gfs2_decode_fh, | |
280 | .encode_fh = gfs2_encode_fh, | |
281 | .get_name = gfs2_get_name, | |
282 | .get_parent = gfs2_get_parent, | |
283 | .get_dentry = gfs2_get_dentry, | |
284 | }; | |
285 |