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> | |
a5694255 | 14 | #include <linux/exportfs.h> |
5c676f6d | 15 | #include <linux/gfs2_ondisk.h> |
71b86f56 | 16 | #include <linux/crc32.h> |
7d308590 | 17 | #include <linux/lm_interface.h> |
b3b94faa DT |
18 | |
19 | #include "gfs2.h" | |
5c676f6d | 20 | #include "incore.h" |
b3b94faa DT |
21 | #include "dir.h" |
22 | #include "glock.h" | |
23 | #include "glops.h" | |
24 | #include "inode.h" | |
b2760583 | 25 | #include "super.h" |
b3b94faa | 26 | #include "rgrp.h" |
c752666c | 27 | #include "util.h" |
b3b94faa | 28 | |
bb8d8a6f | 29 | #define GFS2_SMALL_FH_SIZE 4 |
35dcc52e | 30 | #define GFS2_LARGE_FH_SIZE 8 |
3ebf4490 | 31 | #define GFS2_OLD_FH_SIZE 10 |
bb8d8a6f | 32 | |
b44b84d7 | 33 | static int gfs2_encode_fh(struct dentry *dentry, __u32 *p, int *len, |
b3b94faa DT |
34 | int connectable) |
35 | { | |
b44b84d7 | 36 | __be32 *fh = (__force __be32 *)p; |
b3b94faa | 37 | struct inode *inode = dentry->d_inode; |
c9fd4307 | 38 | struct super_block *sb = inode->i_sb; |
feaa7bba | 39 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa | 40 | |
5acd3967 SW |
41 | if (*len < GFS2_SMALL_FH_SIZE || |
42 | (connectable && *len < GFS2_LARGE_FH_SIZE)) | |
b3b94faa DT |
43 | return 255; |
44 | ||
dbb7cae2 SW |
45 | fh[0] = cpu_to_be32(ip->i_no_formal_ino >> 32); |
46 | fh[1] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF); | |
47 | fh[2] = cpu_to_be32(ip->i_no_addr >> 32); | |
48 | fh[3] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF); | |
5acd3967 | 49 | *len = GFS2_SMALL_FH_SIZE; |
b3b94faa | 50 | |
c9fd4307 | 51 | if (!connectable || inode == sb->s_root->d_inode) |
b3b94faa DT |
52 | return *len; |
53 | ||
54 | spin_lock(&dentry->d_lock); | |
55 | inode = dentry->d_parent->d_inode; | |
feaa7bba SW |
56 | ip = GFS2_I(inode); |
57 | igrab(inode); | |
b3b94faa DT |
58 | spin_unlock(&dentry->d_lock); |
59 | ||
dbb7cae2 SW |
60 | fh[4] = cpu_to_be32(ip->i_no_formal_ino >> 32); |
61 | fh[5] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF); | |
62 | fh[6] = cpu_to_be32(ip->i_no_addr >> 32); | |
63 | fh[7] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF); | |
5acd3967 | 64 | *len = GFS2_LARGE_FH_SIZE; |
b3b94faa | 65 | |
feaa7bba | 66 | iput(inode); |
b3b94faa DT |
67 | |
68 | return *len; | |
69 | } | |
70 | ||
71 | struct get_name_filldir { | |
629a21e7 | 72 | struct gfs2_inum_host inum; |
b3b94faa DT |
73 | char *name; |
74 | }; | |
75 | ||
3699e3a4 SW |
76 | static int get_name_filldir(void *opaque, const char *name, int length, |
77 | loff_t offset, u64 inum, unsigned int type) | |
b3b94faa | 78 | { |
3699e3a4 | 79 | struct get_name_filldir *gnfd = opaque; |
b3b94faa | 80 | |
3699e3a4 | 81 | if (inum != gnfd->inum.no_addr) |
b3b94faa DT |
82 | return 0; |
83 | ||
84 | memcpy(gnfd->name, name, length); | |
85 | gnfd->name[length] = 0; | |
86 | ||
87 | return 1; | |
88 | } | |
89 | ||
90 | static int gfs2_get_name(struct dentry *parent, char *name, | |
91 | struct dentry *child) | |
92 | { | |
93 | struct inode *dir = parent->d_inode; | |
94 | struct inode *inode = child->d_inode; | |
95 | struct gfs2_inode *dip, *ip; | |
96 | struct get_name_filldir gnfd; | |
97 | struct gfs2_holder gh; | |
cd915493 | 98 | u64 offset = 0; |
b3b94faa DT |
99 | int error; |
100 | ||
101 | if (!dir) | |
102 | return -EINVAL; | |
103 | ||
b3b94faa DT |
104 | if (!S_ISDIR(dir->i_mode) || !inode) |
105 | return -EINVAL; | |
106 | ||
feaa7bba SW |
107 | dip = GFS2_I(dir); |
108 | ip = GFS2_I(inode); | |
b3b94faa DT |
109 | |
110 | *name = 0; | |
dbb7cae2 SW |
111 | gnfd.inum.no_addr = ip->i_no_addr; |
112 | gnfd.inum.no_formal_ino = ip->i_no_formal_ino; | |
b3b94faa DT |
113 | gnfd.name = name; |
114 | ||
115 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh); | |
116 | if (error) | |
117 | return error; | |
118 | ||
71b86f56 | 119 | error = gfs2_dir_read(dir, &offset, &gnfd, get_name_filldir); |
b3b94faa DT |
120 | |
121 | gfs2_glock_dq_uninit(&gh); | |
122 | ||
123 | if (!error && !*name) | |
124 | error = -ENOENT; | |
125 | ||
126 | return error; | |
127 | } | |
128 | ||
129 | static struct dentry *gfs2_get_parent(struct dentry *child) | |
130 | { | |
71b86f56 | 131 | struct qstr dotdot; |
b3b94faa | 132 | struct dentry *dentry; |
b3b94faa | 133 | |
7b625361 | 134 | /* |
44003728 CH |
135 | * XXX(hch): it would be a good idea to keep this around as a |
136 | * static variable. | |
7b625361 | 137 | */ |
44003728 | 138 | gfs2_str2qstr(&dotdot, ".."); |
b3b94faa | 139 | |
44003728 CH |
140 | dentry = d_obtain_alias(gfs2_lookupi(child->d_inode, &dotdot, 1)); |
141 | if (!IS_ERR(dentry)) | |
142 | dentry->d_op = &gfs2_dops; | |
b3b94faa DT |
143 | return dentry; |
144 | } | |
145 | ||
34c0d154 CH |
146 | static struct dentry *gfs2_get_dentry(struct super_block *sb, |
147 | struct gfs2_inum_host *inum) | |
b3b94faa | 148 | { |
5c676f6d | 149 | struct gfs2_sbd *sdp = sb->s_fs_info; |
b3b94faa DT |
150 | struct gfs2_holder i_gh, ri_gh, rgd_gh; |
151 | struct gfs2_rgrpd *rgd; | |
b3b94faa DT |
152 | struct inode *inode; |
153 | struct dentry *dentry; | |
154 | int error; | |
155 | ||
b3b94faa DT |
156 | /* System files? */ |
157 | ||
dbb7cae2 | 158 | inode = gfs2_ilookup(sb, inum->no_addr); |
b3b94faa | 159 | if (inode) { |
dbb7cae2 | 160 | if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) { |
b3b94faa DT |
161 | iput(inode); |
162 | return ERR_PTR(-ESTALE); | |
163 | } | |
164 | goto out_inode; | |
165 | } | |
166 | ||
feaa7bba | 167 | error = gfs2_glock_nq_num(sdp, inum->no_addr, &gfs2_inode_glops, |
1c0f4872 | 168 | LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
b3b94faa DT |
169 | if (error) |
170 | return ERR_PTR(error); | |
171 | ||
b3b94faa DT |
172 | error = gfs2_rindex_hold(sdp, &ri_gh); |
173 | if (error) | |
174 | goto fail; | |
175 | ||
176 | error = -EINVAL; | |
177 | rgd = gfs2_blk2rgrpd(sdp, inum->no_addr); | |
178 | if (!rgd) | |
179 | goto fail_rindex; | |
180 | ||
181 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_SHARED, 0, &rgd_gh); | |
182 | if (error) | |
183 | goto fail_rindex; | |
184 | ||
185 | error = -ESTALE; | |
186 | if (gfs2_get_block_type(rgd, inum->no_addr) != GFS2_BLKST_DINODE) | |
187 | goto fail_rgd; | |
188 | ||
189 | gfs2_glock_dq_uninit(&rgd_gh); | |
190 | gfs2_glock_dq_uninit(&ri_gh); | |
191 | ||
35dcc52e | 192 | inode = gfs2_inode_lookup(sb, DT_UNKNOWN, |
bb9bcf06 | 193 | inum->no_addr, |
7a9f53b3 | 194 | 0, 0); |
feaa7bba SW |
195 | if (IS_ERR(inode)) { |
196 | error = PTR_ERR(inode); | |
b3b94faa | 197 | goto fail; |
feaa7bba | 198 | } |
b3b94faa | 199 | |
feaa7bba | 200 | error = gfs2_inode_refresh(GFS2_I(inode)); |
b3b94faa | 201 | if (error) { |
feaa7bba | 202 | iput(inode); |
b3b94faa DT |
203 | goto fail; |
204 | } | |
35dcc52e WC |
205 | |
206 | /* Pick up the works we bypass in gfs2_inode_lookup */ | |
207 | if (inode->i_state & I_NEW) | |
208 | gfs2_set_iop(inode); | |
209 | ||
dbb7cae2 SW |
210 | if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) { |
211 | iput(inode); | |
212 | goto fail; | |
213 | } | |
b3b94faa | 214 | |
b3b94faa | 215 | error = -EIO; |
383f01fb | 216 | if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) { |
feaa7bba | 217 | iput(inode); |
b3b94faa DT |
218 | goto fail; |
219 | } | |
220 | ||
221 | gfs2_glock_dq_uninit(&i_gh); | |
222 | ||
feaa7bba | 223 | out_inode: |
44003728 CH |
224 | dentry = d_obtain_alias(inode); |
225 | if (!IS_ERR(dentry)) | |
226 | dentry->d_op = &gfs2_dops; | |
b3b94faa DT |
227 | return dentry; |
228 | ||
feaa7bba | 229 | fail_rgd: |
b3b94faa DT |
230 | gfs2_glock_dq_uninit(&rgd_gh); |
231 | ||
feaa7bba | 232 | fail_rindex: |
b3b94faa DT |
233 | gfs2_glock_dq_uninit(&ri_gh); |
234 | ||
feaa7bba | 235 | fail: |
b3b94faa DT |
236 | gfs2_glock_dq_uninit(&i_gh); |
237 | return ERR_PTR(error); | |
238 | } | |
239 | ||
34c0d154 CH |
240 | static struct dentry *gfs2_fh_to_dentry(struct super_block *sb, struct fid *fid, |
241 | int fh_len, int fh_type) | |
242 | { | |
243 | struct gfs2_inum_host this; | |
244 | __be32 *fh = (__force __be32 *)fid->raw; | |
245 | ||
246 | switch (fh_type) { | |
247 | case GFS2_SMALL_FH_SIZE: | |
248 | case GFS2_LARGE_FH_SIZE: | |
249 | case GFS2_OLD_FH_SIZE: | |
250 | this.no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32; | |
251 | this.no_formal_ino |= be32_to_cpu(fh[1]); | |
252 | this.no_addr = ((u64)be32_to_cpu(fh[2])) << 32; | |
253 | this.no_addr |= be32_to_cpu(fh[3]); | |
254 | return gfs2_get_dentry(sb, &this); | |
255 | default: | |
256 | return NULL; | |
257 | } | |
258 | } | |
259 | ||
260 | static struct dentry *gfs2_fh_to_parent(struct super_block *sb, struct fid *fid, | |
261 | int fh_len, int fh_type) | |
262 | { | |
263 | struct gfs2_inum_host parent; | |
264 | __be32 *fh = (__force __be32 *)fid->raw; | |
265 | ||
266 | switch (fh_type) { | |
267 | case GFS2_LARGE_FH_SIZE: | |
268 | case GFS2_OLD_FH_SIZE: | |
269 | parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32; | |
270 | parent.no_formal_ino |= be32_to_cpu(fh[5]); | |
271 | parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32; | |
272 | parent.no_addr |= be32_to_cpu(fh[7]); | |
273 | return gfs2_get_dentry(sb, &parent); | |
274 | default: | |
275 | return NULL; | |
276 | } | |
277 | } | |
278 | ||
39655164 | 279 | const struct export_operations gfs2_export_ops = { |
b3b94faa | 280 | .encode_fh = gfs2_encode_fh, |
34c0d154 CH |
281 | .fh_to_dentry = gfs2_fh_to_dentry, |
282 | .fh_to_parent = gfs2_fh_to_parent, | |
b3b94faa DT |
283 | .get_name = gfs2_get_name, |
284 | .get_parent = gfs2_get_parent, | |
b3b94faa DT |
285 | }; |
286 |