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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> | |
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" |
bb8d8a6f | 25 | #include "ops_fstype.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 |
bb8d8a6f | 31 | |
b3b94faa | 32 | static struct dentry *gfs2_decode_fh(struct super_block *sb, |
b44b84d7 | 33 | __u32 *p, |
b3b94faa DT |
34 | int fh_len, |
35 | int fh_type, | |
36 | int (*acceptable)(void *context, | |
37 | struct dentry *dentry), | |
38 | void *context) | |
39 | { | |
b44b84d7 | 40 | __be32 *fh = (__force __be32 *)p; |
35dcc52e | 41 | struct gfs2_inum_host inum, parent; |
b3b94faa | 42 | |
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]); |
5acd3967 | 51 | case GFS2_SMALL_FH_SIZE: |
35dcc52e WC |
52 | inum.no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32; |
53 | inum.no_formal_ino |= be32_to_cpu(fh[1]); | |
54 | inum.no_addr = ((u64)be32_to_cpu(fh[2])) << 32; | |
55 | inum.no_addr |= be32_to_cpu(fh[3]); | |
b3b94faa DT |
56 | break; |
57 | default: | |
58 | return NULL; | |
59 | } | |
60 | ||
35dcc52e | 61 | return gfs2_export_ops.find_exported_dentry(sb, &inum, &parent, |
b3b94faa DT |
62 | acceptable, context); |
63 | } | |
64 | ||
b44b84d7 | 65 | static int gfs2_encode_fh(struct dentry *dentry, __u32 *p, int *len, |
b3b94faa DT |
66 | int connectable) |
67 | { | |
b44b84d7 | 68 | __be32 *fh = (__force __be32 *)p; |
b3b94faa | 69 | struct inode *inode = dentry->d_inode; |
c9fd4307 | 70 | struct super_block *sb = inode->i_sb; |
feaa7bba | 71 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa | 72 | |
5acd3967 SW |
73 | if (*len < GFS2_SMALL_FH_SIZE || |
74 | (connectable && *len < GFS2_LARGE_FH_SIZE)) | |
b3b94faa DT |
75 | return 255; |
76 | ||
dbb7cae2 SW |
77 | fh[0] = cpu_to_be32(ip->i_no_formal_ino >> 32); |
78 | fh[1] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF); | |
79 | fh[2] = cpu_to_be32(ip->i_no_addr >> 32); | |
80 | fh[3] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF); | |
5acd3967 | 81 | *len = GFS2_SMALL_FH_SIZE; |
b3b94faa | 82 | |
c9fd4307 | 83 | if (!connectable || inode == sb->s_root->d_inode) |
b3b94faa DT |
84 | return *len; |
85 | ||
86 | spin_lock(&dentry->d_lock); | |
87 | inode = dentry->d_parent->d_inode; | |
feaa7bba SW |
88 | ip = GFS2_I(inode); |
89 | igrab(inode); | |
b3b94faa DT |
90 | spin_unlock(&dentry->d_lock); |
91 | ||
dbb7cae2 SW |
92 | fh[4] = cpu_to_be32(ip->i_no_formal_ino >> 32); |
93 | fh[5] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF); | |
94 | fh[6] = cpu_to_be32(ip->i_no_addr >> 32); | |
95 | fh[7] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF); | |
5acd3967 | 96 | *len = GFS2_LARGE_FH_SIZE; |
b3b94faa | 97 | |
feaa7bba | 98 | iput(inode); |
b3b94faa DT |
99 | |
100 | return *len; | |
101 | } | |
102 | ||
103 | struct get_name_filldir { | |
629a21e7 | 104 | struct gfs2_inum_host inum; |
b3b94faa DT |
105 | char *name; |
106 | }; | |
107 | ||
3699e3a4 SW |
108 | static int get_name_filldir(void *opaque, const char *name, int length, |
109 | loff_t offset, u64 inum, unsigned int type) | |
b3b94faa | 110 | { |
3699e3a4 | 111 | struct get_name_filldir *gnfd = opaque; |
b3b94faa | 112 | |
3699e3a4 | 113 | if (inum != gnfd->inum.no_addr) |
b3b94faa DT |
114 | return 0; |
115 | ||
116 | memcpy(gnfd->name, name, length); | |
117 | gnfd->name[length] = 0; | |
118 | ||
119 | return 1; | |
120 | } | |
121 | ||
122 | static int gfs2_get_name(struct dentry *parent, char *name, | |
123 | struct dentry *child) | |
124 | { | |
125 | struct inode *dir = parent->d_inode; | |
126 | struct inode *inode = child->d_inode; | |
127 | struct gfs2_inode *dip, *ip; | |
128 | struct get_name_filldir gnfd; | |
129 | struct gfs2_holder gh; | |
cd915493 | 130 | u64 offset = 0; |
b3b94faa DT |
131 | int error; |
132 | ||
133 | if (!dir) | |
134 | return -EINVAL; | |
135 | ||
b3b94faa DT |
136 | if (!S_ISDIR(dir->i_mode) || !inode) |
137 | return -EINVAL; | |
138 | ||
feaa7bba SW |
139 | dip = GFS2_I(dir); |
140 | ip = GFS2_I(inode); | |
b3b94faa DT |
141 | |
142 | *name = 0; | |
dbb7cae2 SW |
143 | gnfd.inum.no_addr = ip->i_no_addr; |
144 | gnfd.inum.no_formal_ino = ip->i_no_formal_ino; | |
b3b94faa DT |
145 | gnfd.name = name; |
146 | ||
147 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh); | |
148 | if (error) | |
149 | return error; | |
150 | ||
71b86f56 | 151 | error = gfs2_dir_read(dir, &offset, &gnfd, get_name_filldir); |
b3b94faa DT |
152 | |
153 | gfs2_glock_dq_uninit(&gh); | |
154 | ||
155 | if (!error && !*name) | |
156 | error = -ENOENT; | |
157 | ||
158 | return error; | |
159 | } | |
160 | ||
161 | static struct dentry *gfs2_get_parent(struct dentry *child) | |
162 | { | |
71b86f56 | 163 | struct qstr dotdot; |
b3b94faa DT |
164 | struct inode *inode; |
165 | struct dentry *dentry; | |
b3b94faa | 166 | |
71b86f56 | 167 | gfs2_str2qstr(&dotdot, ".."); |
c752666c SW |
168 | inode = gfs2_lookupi(child->d_inode, &dotdot, 1, NULL); |
169 | ||
170 | if (!inode) | |
171 | return ERR_PTR(-ENOENT); | |
7b625361 SW |
172 | /* |
173 | * In case of an error, @inode carries the error value, and we | |
174 | * have to return that as a(n invalid) pointer to dentry. | |
175 | */ | |
c752666c SW |
176 | if (IS_ERR(inode)) |
177 | return ERR_PTR(PTR_ERR(inode)); | |
b3b94faa | 178 | |
b3b94faa DT |
179 | dentry = d_alloc_anon(inode); |
180 | if (!dentry) { | |
181 | iput(inode); | |
182 | return ERR_PTR(-ENOMEM); | |
183 | } | |
184 | ||
70831465 | 185 | dentry->d_op = &gfs2_dops; |
b3b94faa DT |
186 | return dentry; |
187 | } | |
188 | ||
2eb168ca | 189 | static struct dentry *gfs2_get_dentry(struct super_block *sb, void *inum_obj) |
b3b94faa | 190 | { |
5c676f6d | 191 | struct gfs2_sbd *sdp = sb->s_fs_info; |
35dcc52e | 192 | struct gfs2_inum_host *inum = inum_obj; |
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 | ||
dbb7cae2 | 201 | inode = gfs2_ilookup(sb, inum->no_addr); |
b3b94faa | 202 | if (inode) { |
dbb7cae2 | 203 | if (GFS2_I(inode)->i_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, |
1c0f4872 | 211 | LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
b3b94faa DT |
212 | if (error) |
213 | return ERR_PTR(error); | |
214 | ||
b3b94faa DT |
215 | error = gfs2_rindex_hold(sdp, &ri_gh); |
216 | if (error) | |
217 | goto fail; | |
218 | ||
219 | error = -EINVAL; | |
220 | rgd = gfs2_blk2rgrpd(sdp, inum->no_addr); | |
221 | if (!rgd) | |
222 | goto fail_rindex; | |
223 | ||
224 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_SHARED, 0, &rgd_gh); | |
225 | if (error) | |
226 | goto fail_rindex; | |
227 | ||
228 | error = -ESTALE; | |
229 | if (gfs2_get_block_type(rgd, inum->no_addr) != GFS2_BLKST_DINODE) | |
230 | goto fail_rgd; | |
231 | ||
232 | gfs2_glock_dq_uninit(&rgd_gh); | |
233 | gfs2_glock_dq_uninit(&ri_gh); | |
234 | ||
35dcc52e | 235 | inode = gfs2_inode_lookup(sb, DT_UNKNOWN, |
bb9bcf06 | 236 | inum->no_addr, |
35dcc52e | 237 | 0); |
feaa7bba SW |
238 | if (!inode) |
239 | goto fail; | |
240 | if (IS_ERR(inode)) { | |
241 | error = PTR_ERR(inode); | |
b3b94faa | 242 | goto fail; |
feaa7bba | 243 | } |
b3b94faa | 244 | |
feaa7bba | 245 | error = gfs2_inode_refresh(GFS2_I(inode)); |
b3b94faa | 246 | if (error) { |
feaa7bba | 247 | iput(inode); |
b3b94faa DT |
248 | goto fail; |
249 | } | |
35dcc52e WC |
250 | |
251 | /* Pick up the works we bypass in gfs2_inode_lookup */ | |
252 | if (inode->i_state & I_NEW) | |
253 | gfs2_set_iop(inode); | |
254 | ||
dbb7cae2 SW |
255 | if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) { |
256 | iput(inode); | |
257 | goto fail; | |
258 | } | |
b3b94faa | 259 | |
b3b94faa | 260 | error = -EIO; |
feaa7bba SW |
261 | if (GFS2_I(inode)->i_di.di_flags & GFS2_DIF_SYSTEM) { |
262 | iput(inode); | |
b3b94faa DT |
263 | goto fail; |
264 | } | |
265 | ||
266 | gfs2_glock_dq_uninit(&i_gh); | |
267 | ||
feaa7bba | 268 | out_inode: |
b3b94faa DT |
269 | dentry = d_alloc_anon(inode); |
270 | if (!dentry) { | |
271 | iput(inode); | |
272 | return ERR_PTR(-ENOMEM); | |
273 | } | |
274 | ||
70831465 | 275 | dentry->d_op = &gfs2_dops; |
b3b94faa DT |
276 | return dentry; |
277 | ||
feaa7bba | 278 | fail_rgd: |
b3b94faa DT |
279 | gfs2_glock_dq_uninit(&rgd_gh); |
280 | ||
feaa7bba | 281 | fail_rindex: |
b3b94faa DT |
282 | gfs2_glock_dq_uninit(&ri_gh); |
283 | ||
feaa7bba | 284 | fail: |
b3b94faa DT |
285 | gfs2_glock_dq_uninit(&i_gh); |
286 | return ERR_PTR(error); | |
287 | } | |
288 | ||
289 | struct export_operations gfs2_export_ops = { | |
290 | .decode_fh = gfs2_decode_fh, | |
291 | .encode_fh = gfs2_encode_fh, | |
292 | .get_name = gfs2_get_name, | |
293 | .get_parent = gfs2_get_parent, | |
294 | .get_dentry = gfs2_get_dentry, | |
295 | }; | |
296 |