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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> |
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" | |
b2760583 | 24 | #include "super.h" |
b3b94faa | 25 | #include "rgrp.h" |
c752666c | 26 | #include "util.h" |
b3b94faa | 27 | |
bb8d8a6f | 28 | #define GFS2_SMALL_FH_SIZE 4 |
35dcc52e | 29 | #define GFS2_LARGE_FH_SIZE 8 |
3ebf4490 | 30 | #define GFS2_OLD_FH_SIZE 10 |
bb8d8a6f | 31 | |
b44b84d7 | 32 | static int gfs2_encode_fh(struct dentry *dentry, __u32 *p, int *len, |
b3b94faa DT |
33 | int connectable) |
34 | { | |
b44b84d7 | 35 | __be32 *fh = (__force __be32 *)p; |
b3b94faa | 36 | struct inode *inode = dentry->d_inode; |
c9fd4307 | 37 | struct super_block *sb = inode->i_sb; |
feaa7bba | 38 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa | 39 | |
5acd3967 SW |
40 | if (*len < GFS2_SMALL_FH_SIZE || |
41 | (connectable && *len < GFS2_LARGE_FH_SIZE)) | |
b3b94faa DT |
42 | return 255; |
43 | ||
dbb7cae2 SW |
44 | fh[0] = cpu_to_be32(ip->i_no_formal_ino >> 32); |
45 | fh[1] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF); | |
46 | fh[2] = cpu_to_be32(ip->i_no_addr >> 32); | |
47 | fh[3] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF); | |
5acd3967 | 48 | *len = GFS2_SMALL_FH_SIZE; |
b3b94faa | 49 | |
c9fd4307 | 50 | if (!connectable || inode == sb->s_root->d_inode) |
b3b94faa DT |
51 | return *len; |
52 | ||
53 | spin_lock(&dentry->d_lock); | |
54 | inode = dentry->d_parent->d_inode; | |
feaa7bba SW |
55 | ip = GFS2_I(inode); |
56 | igrab(inode); | |
b3b94faa DT |
57 | spin_unlock(&dentry->d_lock); |
58 | ||
dbb7cae2 SW |
59 | fh[4] = cpu_to_be32(ip->i_no_formal_ino >> 32); |
60 | fh[5] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF); | |
61 | fh[6] = cpu_to_be32(ip->i_no_addr >> 32); | |
62 | fh[7] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF); | |
5acd3967 | 63 | *len = GFS2_LARGE_FH_SIZE; |
b3b94faa | 64 | |
feaa7bba | 65 | iput(inode); |
b3b94faa DT |
66 | |
67 | return *len; | |
68 | } | |
69 | ||
70 | struct get_name_filldir { | |
629a21e7 | 71 | struct gfs2_inum_host inum; |
b3b94faa DT |
72 | char *name; |
73 | }; | |
74 | ||
3699e3a4 SW |
75 | static int get_name_filldir(void *opaque, const char *name, int length, |
76 | loff_t offset, u64 inum, unsigned int type) | |
b3b94faa | 77 | { |
3699e3a4 | 78 | struct get_name_filldir *gnfd = opaque; |
b3b94faa | 79 | |
3699e3a4 | 80 | if (inum != gnfd->inum.no_addr) |
b3b94faa DT |
81 | return 0; |
82 | ||
83 | memcpy(gnfd->name, name, length); | |
84 | gnfd->name[length] = 0; | |
85 | ||
86 | return 1; | |
87 | } | |
88 | ||
89 | static int gfs2_get_name(struct dentry *parent, char *name, | |
90 | struct dentry *child) | |
91 | { | |
92 | struct inode *dir = parent->d_inode; | |
93 | struct inode *inode = child->d_inode; | |
94 | struct gfs2_inode *dip, *ip; | |
95 | struct get_name_filldir gnfd; | |
96 | struct gfs2_holder gh; | |
cd915493 | 97 | u64 offset = 0; |
b3b94faa DT |
98 | int error; |
99 | ||
100 | if (!dir) | |
101 | return -EINVAL; | |
102 | ||
b3b94faa DT |
103 | if (!S_ISDIR(dir->i_mode) || !inode) |
104 | return -EINVAL; | |
105 | ||
feaa7bba SW |
106 | dip = GFS2_I(dir); |
107 | ip = GFS2_I(inode); | |
b3b94faa DT |
108 | |
109 | *name = 0; | |
dbb7cae2 SW |
110 | gnfd.inum.no_addr = ip->i_no_addr; |
111 | gnfd.inum.no_formal_ino = ip->i_no_formal_ino; | |
b3b94faa DT |
112 | gnfd.name = name; |
113 | ||
114 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh); | |
115 | if (error) | |
116 | return error; | |
117 | ||
71b86f56 | 118 | error = gfs2_dir_read(dir, &offset, &gnfd, get_name_filldir); |
b3b94faa DT |
119 | |
120 | gfs2_glock_dq_uninit(&gh); | |
121 | ||
122 | if (!error && !*name) | |
123 | error = -ENOENT; | |
124 | ||
125 | return error; | |
126 | } | |
127 | ||
128 | static struct dentry *gfs2_get_parent(struct dentry *child) | |
129 | { | |
71b86f56 | 130 | struct qstr dotdot; |
b3b94faa | 131 | struct dentry *dentry; |
b3b94faa | 132 | |
7b625361 | 133 | /* |
44003728 CH |
134 | * XXX(hch): it would be a good idea to keep this around as a |
135 | * static variable. | |
7b625361 | 136 | */ |
44003728 | 137 | gfs2_str2qstr(&dotdot, ".."); |
b3b94faa | 138 | |
44003728 CH |
139 | dentry = d_obtain_alias(gfs2_lookupi(child->d_inode, &dotdot, 1)); |
140 | if (!IS_ERR(dentry)) | |
141 | dentry->d_op = &gfs2_dops; | |
b3b94faa DT |
142 | return dentry; |
143 | } | |
144 | ||
34c0d154 | 145 | static struct dentry *gfs2_get_dentry(struct super_block *sb, |
acf7e244 | 146 | struct gfs2_inum_host *inum) |
b3b94faa | 147 | { |
5c676f6d | 148 | struct gfs2_sbd *sdp = sb->s_fs_info; |
acf7e244 | 149 | struct gfs2_holder i_gh; |
b3b94faa DT |
150 | struct inode *inode; |
151 | struct dentry *dentry; | |
152 | int error; | |
153 | ||
dbb7cae2 | 154 | inode = gfs2_ilookup(sb, inum->no_addr); |
b3b94faa | 155 | if (inode) { |
dbb7cae2 | 156 | if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) { |
b3b94faa DT |
157 | iput(inode); |
158 | return ERR_PTR(-ESTALE); | |
159 | } | |
160 | goto out_inode; | |
161 | } | |
162 | ||
feaa7bba | 163 | error = gfs2_glock_nq_num(sdp, inum->no_addr, &gfs2_inode_glops, |
1c0f4872 | 164 | LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
b3b94faa DT |
165 | if (error) |
166 | return ERR_PTR(error); | |
167 | ||
acf7e244 | 168 | error = gfs2_check_blk_type(sdp, inum->no_addr, GFS2_BLKST_DINODE); |
b3b94faa DT |
169 | if (error) |
170 | goto fail; | |
171 | ||
1a0eae88 | 172 | inode = gfs2_inode_lookup(sb, DT_UNKNOWN, inum->no_addr, 0); |
feaa7bba SW |
173 | if (IS_ERR(inode)) { |
174 | error = PTR_ERR(inode); | |
b3b94faa | 175 | goto fail; |
feaa7bba | 176 | } |
b3b94faa | 177 | |
feaa7bba | 178 | error = gfs2_inode_refresh(GFS2_I(inode)); |
b3b94faa | 179 | if (error) { |
feaa7bba | 180 | iput(inode); |
b3b94faa DT |
181 | goto fail; |
182 | } | |
35dcc52e WC |
183 | |
184 | /* Pick up the works we bypass in gfs2_inode_lookup */ | |
185 | if (inode->i_state & I_NEW) | |
186 | gfs2_set_iop(inode); | |
187 | ||
dbb7cae2 SW |
188 | if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) { |
189 | iput(inode); | |
190 | goto fail; | |
191 | } | |
b3b94faa | 192 | |
b3b94faa | 193 | error = -EIO; |
383f01fb | 194 | if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) { |
feaa7bba | 195 | iput(inode); |
b3b94faa DT |
196 | goto fail; |
197 | } | |
198 | ||
199 | gfs2_glock_dq_uninit(&i_gh); | |
200 | ||
feaa7bba | 201 | out_inode: |
44003728 CH |
202 | dentry = d_obtain_alias(inode); |
203 | if (!IS_ERR(dentry)) | |
204 | dentry->d_op = &gfs2_dops; | |
b3b94faa | 205 | return dentry; |
feaa7bba | 206 | fail: |
b3b94faa DT |
207 | gfs2_glock_dq_uninit(&i_gh); |
208 | return ERR_PTR(error); | |
209 | } | |
210 | ||
34c0d154 CH |
211 | static struct dentry *gfs2_fh_to_dentry(struct super_block *sb, struct fid *fid, |
212 | int fh_len, int fh_type) | |
213 | { | |
214 | struct gfs2_inum_host this; | |
215 | __be32 *fh = (__force __be32 *)fid->raw; | |
216 | ||
217 | switch (fh_type) { | |
218 | case GFS2_SMALL_FH_SIZE: | |
219 | case GFS2_LARGE_FH_SIZE: | |
220 | case GFS2_OLD_FH_SIZE: | |
221 | this.no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32; | |
222 | this.no_formal_ino |= be32_to_cpu(fh[1]); | |
223 | this.no_addr = ((u64)be32_to_cpu(fh[2])) << 32; | |
224 | this.no_addr |= be32_to_cpu(fh[3]); | |
225 | return gfs2_get_dentry(sb, &this); | |
226 | default: | |
227 | return NULL; | |
228 | } | |
229 | } | |
230 | ||
231 | static struct dentry *gfs2_fh_to_parent(struct super_block *sb, struct fid *fid, | |
232 | int fh_len, int fh_type) | |
233 | { | |
234 | struct gfs2_inum_host parent; | |
235 | __be32 *fh = (__force __be32 *)fid->raw; | |
236 | ||
237 | switch (fh_type) { | |
238 | case GFS2_LARGE_FH_SIZE: | |
239 | case GFS2_OLD_FH_SIZE: | |
240 | parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32; | |
241 | parent.no_formal_ino |= be32_to_cpu(fh[5]); | |
242 | parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32; | |
243 | parent.no_addr |= be32_to_cpu(fh[7]); | |
244 | return gfs2_get_dentry(sb, &parent); | |
245 | default: | |
246 | return NULL; | |
247 | } | |
248 | } | |
249 | ||
39655164 | 250 | const struct export_operations gfs2_export_ops = { |
b3b94faa | 251 | .encode_fh = gfs2_encode_fh, |
34c0d154 CH |
252 | .fh_to_dentry = gfs2_fh_to_dentry, |
253 | .fh_to_parent = gfs2_fh_to_parent, | |
b3b94faa DT |
254 | .get_name = gfs2_get_name, |
255 | .get_parent = gfs2_get_parent, | |
b3b94faa DT |
256 | }; |
257 |