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" | |
70831465 | 25 | #include "ops_dentry.h" |
bb8d8a6f | 26 | #include "ops_fstype.h" |
b3b94faa | 27 | #include "rgrp.h" |
c752666c | 28 | #include "util.h" |
b3b94faa | 29 | |
bb8d8a6f | 30 | #define GFS2_SMALL_FH_SIZE 4 |
35dcc52e | 31 | #define GFS2_LARGE_FH_SIZE 8 |
3ebf4490 | 32 | #define GFS2_OLD_FH_SIZE 10 |
bb8d8a6f | 33 | |
b3b94faa | 34 | static struct dentry *gfs2_decode_fh(struct super_block *sb, |
b44b84d7 | 35 | __u32 *p, |
b3b94faa DT |
36 | int fh_len, |
37 | int fh_type, | |
38 | int (*acceptable)(void *context, | |
39 | struct dentry *dentry), | |
40 | void *context) | |
41 | { | |
b44b84d7 | 42 | __be32 *fh = (__force __be32 *)p; |
35dcc52e | 43 | struct gfs2_inum_host inum, parent; |
b3b94faa | 44 | |
b3b94faa DT |
45 | memset(&parent, 0, sizeof(struct gfs2_inum)); |
46 | ||
a7d2b2bd | 47 | switch (fh_len) { |
5acd3967 | 48 | case GFS2_LARGE_FH_SIZE: |
3ebf4490 | 49 | case GFS2_OLD_FH_SIZE: |
cd915493 | 50 | parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32; |
b3b94faa | 51 | parent.no_formal_ino |= be32_to_cpu(fh[5]); |
cd915493 | 52 | parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32; |
b3b94faa | 53 | parent.no_addr |= be32_to_cpu(fh[7]); |
5acd3967 | 54 | case GFS2_SMALL_FH_SIZE: |
35dcc52e WC |
55 | inum.no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32; |
56 | inum.no_formal_ino |= be32_to_cpu(fh[1]); | |
57 | inum.no_addr = ((u64)be32_to_cpu(fh[2])) << 32; | |
58 | inum.no_addr |= be32_to_cpu(fh[3]); | |
b3b94faa DT |
59 | break; |
60 | default: | |
61 | return NULL; | |
62 | } | |
63 | ||
35dcc52e | 64 | return gfs2_export_ops.find_exported_dentry(sb, &inum, &parent, |
b3b94faa DT |
65 | acceptable, context); |
66 | } | |
67 | ||
b44b84d7 | 68 | static int gfs2_encode_fh(struct dentry *dentry, __u32 *p, int *len, |
b3b94faa DT |
69 | int connectable) |
70 | { | |
b44b84d7 | 71 | __be32 *fh = (__force __be32 *)p; |
b3b94faa | 72 | struct inode *inode = dentry->d_inode; |
c9fd4307 | 73 | struct super_block *sb = inode->i_sb; |
feaa7bba | 74 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa | 75 | |
5acd3967 SW |
76 | if (*len < GFS2_SMALL_FH_SIZE || |
77 | (connectable && *len < GFS2_LARGE_FH_SIZE)) | |
b3b94faa DT |
78 | return 255; |
79 | ||
dbb7cae2 SW |
80 | fh[0] = cpu_to_be32(ip->i_no_formal_ino >> 32); |
81 | fh[1] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF); | |
82 | fh[2] = cpu_to_be32(ip->i_no_addr >> 32); | |
83 | fh[3] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF); | |
5acd3967 | 84 | *len = GFS2_SMALL_FH_SIZE; |
b3b94faa | 85 | |
c9fd4307 | 86 | if (!connectable || inode == sb->s_root->d_inode) |
b3b94faa DT |
87 | return *len; |
88 | ||
89 | spin_lock(&dentry->d_lock); | |
90 | inode = dentry->d_parent->d_inode; | |
feaa7bba SW |
91 | ip = GFS2_I(inode); |
92 | igrab(inode); | |
b3b94faa DT |
93 | spin_unlock(&dentry->d_lock); |
94 | ||
dbb7cae2 SW |
95 | fh[4] = cpu_to_be32(ip->i_no_formal_ino >> 32); |
96 | fh[5] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF); | |
97 | fh[6] = cpu_to_be32(ip->i_no_addr >> 32); | |
98 | fh[7] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF); | |
5acd3967 | 99 | *len = GFS2_LARGE_FH_SIZE; |
b3b94faa | 100 | |
feaa7bba | 101 | iput(inode); |
b3b94faa DT |
102 | |
103 | return *len; | |
104 | } | |
105 | ||
106 | struct get_name_filldir { | |
629a21e7 | 107 | struct gfs2_inum_host inum; |
b3b94faa DT |
108 | char *name; |
109 | }; | |
110 | ||
3699e3a4 SW |
111 | static int get_name_filldir(void *opaque, const char *name, int length, |
112 | loff_t offset, u64 inum, unsigned int type) | |
b3b94faa | 113 | { |
3699e3a4 | 114 | struct get_name_filldir *gnfd = opaque; |
b3b94faa | 115 | |
3699e3a4 | 116 | if (inum != gnfd->inum.no_addr) |
b3b94faa DT |
117 | return 0; |
118 | ||
119 | memcpy(gnfd->name, name, length); | |
120 | gnfd->name[length] = 0; | |
121 | ||
122 | return 1; | |
123 | } | |
124 | ||
125 | static int gfs2_get_name(struct dentry *parent, char *name, | |
126 | struct dentry *child) | |
127 | { | |
128 | struct inode *dir = parent->d_inode; | |
129 | struct inode *inode = child->d_inode; | |
130 | struct gfs2_inode *dip, *ip; | |
131 | struct get_name_filldir gnfd; | |
132 | struct gfs2_holder gh; | |
cd915493 | 133 | u64 offset = 0; |
b3b94faa DT |
134 | int error; |
135 | ||
136 | if (!dir) | |
137 | return -EINVAL; | |
138 | ||
b3b94faa DT |
139 | if (!S_ISDIR(dir->i_mode) || !inode) |
140 | return -EINVAL; | |
141 | ||
feaa7bba SW |
142 | dip = GFS2_I(dir); |
143 | ip = GFS2_I(inode); | |
b3b94faa DT |
144 | |
145 | *name = 0; | |
dbb7cae2 SW |
146 | gnfd.inum.no_addr = ip->i_no_addr; |
147 | gnfd.inum.no_formal_ino = ip->i_no_formal_ino; | |
b3b94faa DT |
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; |
35dcc52e | 195 | struct gfs2_inum_host *inum = inum_obj; |
b3b94faa DT |
196 | struct gfs2_holder i_gh, ri_gh, rgd_gh; |
197 | struct gfs2_rgrpd *rgd; | |
b3b94faa DT |
198 | struct inode *inode; |
199 | struct dentry *dentry; | |
200 | int error; | |
201 | ||
b3b94faa DT |
202 | /* System files? */ |
203 | ||
dbb7cae2 | 204 | inode = gfs2_ilookup(sb, inum->no_addr); |
b3b94faa | 205 | if (inode) { |
dbb7cae2 | 206 | if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) { |
b3b94faa DT |
207 | iput(inode); |
208 | return ERR_PTR(-ESTALE); | |
209 | } | |
210 | goto out_inode; | |
211 | } | |
212 | ||
feaa7bba | 213 | error = gfs2_glock_nq_num(sdp, inum->no_addr, &gfs2_inode_glops, |
1c0f4872 | 214 | LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
b3b94faa DT |
215 | if (error) |
216 | return ERR_PTR(error); | |
217 | ||
b3b94faa DT |
218 | error = gfs2_rindex_hold(sdp, &ri_gh); |
219 | if (error) | |
220 | goto fail; | |
221 | ||
222 | error = -EINVAL; | |
223 | rgd = gfs2_blk2rgrpd(sdp, inum->no_addr); | |
224 | if (!rgd) | |
225 | goto fail_rindex; | |
226 | ||
227 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_SHARED, 0, &rgd_gh); | |
228 | if (error) | |
229 | goto fail_rindex; | |
230 | ||
231 | error = -ESTALE; | |
232 | if (gfs2_get_block_type(rgd, inum->no_addr) != GFS2_BLKST_DINODE) | |
233 | goto fail_rgd; | |
234 | ||
235 | gfs2_glock_dq_uninit(&rgd_gh); | |
236 | gfs2_glock_dq_uninit(&ri_gh); | |
237 | ||
35dcc52e | 238 | inode = gfs2_inode_lookup(sb, DT_UNKNOWN, |
bb9bcf06 | 239 | inum->no_addr, |
7a9f53b3 | 240 | 0, 0); |
feaa7bba SW |
241 | if (!inode) |
242 | goto fail; | |
243 | if (IS_ERR(inode)) { | |
244 | error = PTR_ERR(inode); | |
b3b94faa | 245 | goto fail; |
feaa7bba | 246 | } |
b3b94faa | 247 | |
feaa7bba | 248 | error = gfs2_inode_refresh(GFS2_I(inode)); |
b3b94faa | 249 | if (error) { |
feaa7bba | 250 | iput(inode); |
b3b94faa DT |
251 | goto fail; |
252 | } | |
35dcc52e WC |
253 | |
254 | /* Pick up the works we bypass in gfs2_inode_lookup */ | |
255 | if (inode->i_state & I_NEW) | |
256 | gfs2_set_iop(inode); | |
257 | ||
dbb7cae2 SW |
258 | if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) { |
259 | iput(inode); | |
260 | goto fail; | |
261 | } | |
b3b94faa | 262 | |
b3b94faa | 263 | error = -EIO; |
feaa7bba SW |
264 | if (GFS2_I(inode)->i_di.di_flags & GFS2_DIF_SYSTEM) { |
265 | iput(inode); | |
b3b94faa DT |
266 | goto fail; |
267 | } | |
268 | ||
269 | gfs2_glock_dq_uninit(&i_gh); | |
270 | ||
feaa7bba | 271 | out_inode: |
b3b94faa DT |
272 | dentry = d_alloc_anon(inode); |
273 | if (!dentry) { | |
274 | iput(inode); | |
275 | return ERR_PTR(-ENOMEM); | |
276 | } | |
277 | ||
70831465 | 278 | dentry->d_op = &gfs2_dops; |
b3b94faa DT |
279 | return dentry; |
280 | ||
feaa7bba | 281 | fail_rgd: |
b3b94faa DT |
282 | gfs2_glock_dq_uninit(&rgd_gh); |
283 | ||
feaa7bba | 284 | fail_rindex: |
b3b94faa DT |
285 | gfs2_glock_dq_uninit(&ri_gh); |
286 | ||
feaa7bba | 287 | fail: |
b3b94faa DT |
288 | gfs2_glock_dq_uninit(&i_gh); |
289 | return ERR_PTR(error); | |
290 | } | |
291 | ||
292 | struct export_operations gfs2_export_ops = { | |
293 | .decode_fh = gfs2_decode_fh, | |
294 | .encode_fh = gfs2_encode_fh, | |
295 | .get_name = gfs2_get_name, | |
296 | .get_parent = gfs2_get_parent, | |
297 | .get_dentry = gfs2_get_dentry, | |
298 | }; | |
299 |