Commit | Line | Data |
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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 | |
e9fc2aa0 | 7 | * of the GNU General Public License version 2. |
b3b94faa DT |
8 | */ |
9 | ||
b3b94faa DT |
10 | #include <linux/slab.h> |
11 | #include <linux/spinlock.h> | |
12 | #include <linux/completion.h> | |
13 | #include <linux/buffer_head.h> | |
5c676f6d | 14 | #include <linux/gfs2_ondisk.h> |
71b86f56 | 15 | #include <linux/crc32.h> |
7d308590 | 16 | #include <linux/lm_interface.h> |
b3b94faa DT |
17 | |
18 | #include "gfs2.h" | |
5c676f6d | 19 | #include "incore.h" |
b3b94faa DT |
20 | #include "dir.h" |
21 | #include "glock.h" | |
22 | #include "glops.h" | |
23 | #include "inode.h" | |
70831465 | 24 | #include "ops_dentry.h" |
b3b94faa DT |
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, | |
b44b84d7 | 30 | __u32 *p, |
b3b94faa DT |
31 | int fh_len, |
32 | int fh_type, | |
33 | int (*acceptable)(void *context, | |
34 | struct dentry *dentry), | |
35 | void *context) | |
36 | { | |
b44b84d7 | 37 | __be32 *fh = (__force __be32 *)p; |
2eb168ca | 38 | struct gfs2_fh_obj fh_obj; |
629a21e7 | 39 | struct gfs2_inum_host *this, parent; |
b3b94faa | 40 | |
2eb168ca WC |
41 | this = &fh_obj.this; |
42 | fh_obj.imode = DT_UNKNOWN; | |
b3b94faa DT |
43 | memset(&parent, 0, sizeof(struct gfs2_inum)); |
44 | ||
a7d2b2bd | 45 | switch (fh_len) { |
5acd3967 | 46 | case GFS2_LARGE_FH_SIZE: |
cd915493 | 47 | parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32; |
b3b94faa | 48 | parent.no_formal_ino |= be32_to_cpu(fh[5]); |
cd915493 | 49 | parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32; |
b3b94faa | 50 | parent.no_addr |= be32_to_cpu(fh[7]); |
2eb168ca | 51 | fh_obj.imode = be32_to_cpu(fh[8]); |
5acd3967 | 52 | case GFS2_SMALL_FH_SIZE: |
cd915493 | 53 | this->no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32; |
2eb168ca | 54 | this->no_formal_ino |= be32_to_cpu(fh[1]); |
cd915493 | 55 | this->no_addr = ((u64)be32_to_cpu(fh[2])) << 32; |
2eb168ca | 56 | this->no_addr |= be32_to_cpu(fh[3]); |
b3b94faa DT |
57 | break; |
58 | default: | |
59 | return NULL; | |
60 | } | |
61 | ||
2eb168ca | 62 | return gfs2_export_ops.find_exported_dentry(sb, &fh_obj, &parent, |
b3b94faa DT |
63 | acceptable, context); |
64 | } | |
65 | ||
b44b84d7 | 66 | static int gfs2_encode_fh(struct dentry *dentry, __u32 *p, int *len, |
b3b94faa DT |
67 | int connectable) |
68 | { | |
b44b84d7 | 69 | __be32 *fh = (__force __be32 *)p; |
b3b94faa | 70 | struct inode *inode = dentry->d_inode; |
c9fd4307 | 71 | struct super_block *sb = inode->i_sb; |
feaa7bba | 72 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa | 73 | |
5acd3967 SW |
74 | if (*len < GFS2_SMALL_FH_SIZE || |
75 | (connectable && *len < GFS2_LARGE_FH_SIZE)) | |
b3b94faa DT |
76 | return 255; |
77 | ||
b44b84d7 AV |
78 | fh[0] = cpu_to_be32(ip->i_num.no_formal_ino >> 32); |
79 | fh[1] = cpu_to_be32(ip->i_num.no_formal_ino & 0xFFFFFFFF); | |
80 | fh[2] = cpu_to_be32(ip->i_num.no_addr >> 32); | |
81 | fh[3] = cpu_to_be32(ip->i_num.no_addr & 0xFFFFFFFF); | |
5acd3967 | 82 | *len = GFS2_SMALL_FH_SIZE; |
b3b94faa | 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 | ||
b44b84d7 AV |
93 | fh[4] = cpu_to_be32(ip->i_num.no_formal_ino >> 32); |
94 | fh[5] = cpu_to_be32(ip->i_num.no_formal_ino & 0xFFFFFFFF); | |
95 | fh[6] = cpu_to_be32(ip->i_num.no_addr >> 32); | |
96 | fh[7] = cpu_to_be32(ip->i_num.no_addr & 0xFFFFFFFF); | |
2eb168ca WC |
97 | |
98 | fh[8] = cpu_to_be32(inode->i_mode); | |
99 | fh[9] = 0; /* pad to double word */ | |
5acd3967 | 100 | *len = GFS2_LARGE_FH_SIZE; |
b3b94faa | 101 | |
feaa7bba | 102 | iput(inode); |
b3b94faa DT |
103 | |
104 | return *len; | |
105 | } | |
106 | ||
107 | struct get_name_filldir { | |
629a21e7 | 108 | struct gfs2_inum_host inum; |
b3b94faa DT |
109 | char *name; |
110 | }; | |
111 | ||
3699e3a4 SW |
112 | static int get_name_filldir(void *opaque, const char *name, int length, |
113 | loff_t offset, u64 inum, unsigned int type) | |
b3b94faa | 114 | { |
3699e3a4 | 115 | struct get_name_filldir *gnfd = opaque; |
b3b94faa | 116 | |
3699e3a4 | 117 | if (inum != gnfd->inum.no_addr) |
b3b94faa DT |
118 | return 0; |
119 | ||
120 | memcpy(gnfd->name, name, length); | |
121 | gnfd->name[length] = 0; | |
122 | ||
123 | return 1; | |
124 | } | |
125 | ||
126 | static int gfs2_get_name(struct dentry *parent, char *name, | |
127 | struct dentry *child) | |
128 | { | |
129 | struct inode *dir = parent->d_inode; | |
130 | struct inode *inode = child->d_inode; | |
131 | struct gfs2_inode *dip, *ip; | |
132 | struct get_name_filldir gnfd; | |
133 | struct gfs2_holder gh; | |
cd915493 | 134 | u64 offset = 0; |
b3b94faa DT |
135 | int error; |
136 | ||
137 | if (!dir) | |
138 | return -EINVAL; | |
139 | ||
b3b94faa DT |
140 | if (!S_ISDIR(dir->i_mode) || !inode) |
141 | return -EINVAL; | |
142 | ||
feaa7bba SW |
143 | dip = GFS2_I(dir); |
144 | ip = GFS2_I(inode); | |
b3b94faa DT |
145 | |
146 | *name = 0; | |
147 | gnfd.inum = ip->i_num; | |
148 | gnfd.name = name; | |
149 | ||
150 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh); | |
151 | if (error) | |
152 | return error; | |
153 | ||
71b86f56 | 154 | error = gfs2_dir_read(dir, &offset, &gnfd, get_name_filldir); |
b3b94faa DT |
155 | |
156 | gfs2_glock_dq_uninit(&gh); | |
157 | ||
158 | if (!error && !*name) | |
159 | error = -ENOENT; | |
160 | ||
161 | return error; | |
162 | } | |
163 | ||
164 | static struct dentry *gfs2_get_parent(struct dentry *child) | |
165 | { | |
71b86f56 | 166 | struct qstr dotdot; |
b3b94faa DT |
167 | struct inode *inode; |
168 | struct dentry *dentry; | |
b3b94faa | 169 | |
71b86f56 | 170 | gfs2_str2qstr(&dotdot, ".."); |
c752666c SW |
171 | inode = gfs2_lookupi(child->d_inode, &dotdot, 1, NULL); |
172 | ||
173 | if (!inode) | |
174 | return ERR_PTR(-ENOENT); | |
7b625361 SW |
175 | /* |
176 | * In case of an error, @inode carries the error value, and we | |
177 | * have to return that as a(n invalid) pointer to dentry. | |
178 | */ | |
c752666c SW |
179 | if (IS_ERR(inode)) |
180 | return ERR_PTR(PTR_ERR(inode)); | |
b3b94faa | 181 | |
b3b94faa DT |
182 | dentry = d_alloc_anon(inode); |
183 | if (!dentry) { | |
184 | iput(inode); | |
185 | return ERR_PTR(-ENOMEM); | |
186 | } | |
187 | ||
70831465 | 188 | dentry->d_op = &gfs2_dops; |
b3b94faa DT |
189 | return dentry; |
190 | } | |
191 | ||
2eb168ca | 192 | static struct dentry *gfs2_get_dentry(struct super_block *sb, void *inum_obj) |
b3b94faa | 193 | { |
5c676f6d | 194 | struct gfs2_sbd *sdp = sb->s_fs_info; |
2eb168ca | 195 | struct gfs2_fh_obj *fh_obj = (struct gfs2_fh_obj *)inum_obj; |
629a21e7 | 196 | struct gfs2_inum_host *inum = &fh_obj->this; |
b3b94faa DT |
197 | struct gfs2_holder i_gh, ri_gh, rgd_gh; |
198 | struct gfs2_rgrpd *rgd; | |
b3b94faa DT |
199 | struct inode *inode; |
200 | struct dentry *dentry; | |
201 | int error; | |
202 | ||
b3b94faa DT |
203 | /* System files? */ |
204 | ||
feaa7bba | 205 | inode = gfs2_ilookup(sb, inum); |
b3b94faa | 206 | if (inode) { |
feaa7bba | 207 | if (GFS2_I(inode)->i_num.no_formal_ino != inum->no_formal_ino) { |
b3b94faa DT |
208 | iput(inode); |
209 | return ERR_PTR(-ESTALE); | |
210 | } | |
211 | goto out_inode; | |
212 | } | |
213 | ||
feaa7bba | 214 | error = gfs2_glock_nq_num(sdp, inum->no_addr, &gfs2_inode_glops, |
1c0f4872 | 215 | LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
b3b94faa DT |
216 | if (error) |
217 | return ERR_PTR(error); | |
218 | ||
b3b94faa DT |
219 | error = gfs2_rindex_hold(sdp, &ri_gh); |
220 | if (error) | |
221 | goto fail; | |
222 | ||
223 | error = -EINVAL; | |
224 | rgd = gfs2_blk2rgrpd(sdp, inum->no_addr); | |
225 | if (!rgd) | |
226 | goto fail_rindex; | |
227 | ||
228 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_SHARED, 0, &rgd_gh); | |
229 | if (error) | |
230 | goto fail_rindex; | |
231 | ||
232 | error = -ESTALE; | |
233 | if (gfs2_get_block_type(rgd, inum->no_addr) != GFS2_BLKST_DINODE) | |
234 | goto fail_rgd; | |
235 | ||
236 | gfs2_glock_dq_uninit(&rgd_gh); | |
237 | gfs2_glock_dq_uninit(&ri_gh); | |
238 | ||
2eb168ca | 239 | inode = gfs2_inode_lookup(sb, inum, fh_obj->imode); |
feaa7bba SW |
240 | if (!inode) |
241 | goto fail; | |
242 | if (IS_ERR(inode)) { | |
243 | error = PTR_ERR(inode); | |
b3b94faa | 244 | goto fail; |
feaa7bba | 245 | } |
b3b94faa | 246 | |
feaa7bba | 247 | error = gfs2_inode_refresh(GFS2_I(inode)); |
b3b94faa | 248 | if (error) { |
feaa7bba | 249 | iput(inode); |
b3b94faa DT |
250 | goto fail; |
251 | } | |
252 | ||
b3b94faa | 253 | error = -EIO; |
feaa7bba SW |
254 | if (GFS2_I(inode)->i_di.di_flags & GFS2_DIF_SYSTEM) { |
255 | iput(inode); | |
b3b94faa DT |
256 | goto fail; |
257 | } | |
258 | ||
259 | gfs2_glock_dq_uninit(&i_gh); | |
260 | ||
feaa7bba | 261 | out_inode: |
b3b94faa DT |
262 | dentry = d_alloc_anon(inode); |
263 | if (!dentry) { | |
264 | iput(inode); | |
265 | return ERR_PTR(-ENOMEM); | |
266 | } | |
267 | ||
70831465 | 268 | dentry->d_op = &gfs2_dops; |
b3b94faa DT |
269 | return dentry; |
270 | ||
feaa7bba | 271 | fail_rgd: |
b3b94faa DT |
272 | gfs2_glock_dq_uninit(&rgd_gh); |
273 | ||
feaa7bba | 274 | fail_rindex: |
b3b94faa DT |
275 | gfs2_glock_dq_uninit(&ri_gh); |
276 | ||
feaa7bba | 277 | fail: |
b3b94faa DT |
278 | gfs2_glock_dq_uninit(&i_gh); |
279 | return ERR_PTR(error); | |
280 | } | |
281 | ||
282 | struct export_operations gfs2_export_ops = { | |
283 | .decode_fh = gfs2_decode_fh, | |
284 | .encode_fh = gfs2_encode_fh, | |
285 | .get_name = gfs2_get_name, | |
286 | .get_parent = gfs2_get_parent, | |
287 | .get_dentry = gfs2_get_dentry, | |
288 | }; | |
289 |