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c088e31d SF |
1 | /* |
2 | * Copyright (C) 2005-2017 Junjiro R. Okajima | |
3 | * | |
4 | * This program, aufs is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
18 | /* | |
19 | * ioctl | |
20 | * plink-management and readdir in userspace. | |
21 | * assist the pathconf(3) wrapper library. | |
22 | * move-down | |
23 | * File-based Hierarchical Storage Management. | |
24 | */ | |
25 | ||
26 | #include <linux/compat.h> | |
27 | #include <linux/file.h> | |
28 | #include "aufs.h" | |
29 | ||
30 | static int au_wbr_fd(struct path *path, struct aufs_wbr_fd __user *arg) | |
31 | { | |
32 | int err, fd; | |
33 | aufs_bindex_t wbi, bindex, bbot; | |
34 | struct file *h_file; | |
35 | struct super_block *sb; | |
36 | struct dentry *root; | |
37 | struct au_branch *br; | |
38 | struct aufs_wbr_fd wbrfd = { | |
39 | .oflags = au_dir_roflags, | |
40 | .brid = -1 | |
41 | }; | |
42 | const int valid = O_RDONLY | O_NONBLOCK | O_LARGEFILE | O_DIRECTORY | |
43 | | O_NOATIME | O_CLOEXEC; | |
44 | ||
45 | AuDebugOn(wbrfd.oflags & ~valid); | |
46 | ||
47 | if (arg) { | |
48 | err = copy_from_user(&wbrfd, arg, sizeof(wbrfd)); | |
49 | if (unlikely(err)) { | |
50 | err = -EFAULT; | |
51 | goto out; | |
52 | } | |
53 | ||
54 | err = -EINVAL; | |
55 | AuDbg("wbrfd{0%o, %d}\n", wbrfd.oflags, wbrfd.brid); | |
56 | wbrfd.oflags |= au_dir_roflags; | |
57 | AuDbg("0%o\n", wbrfd.oflags); | |
58 | if (unlikely(wbrfd.oflags & ~valid)) | |
59 | goto out; | |
60 | } | |
61 | ||
62 | fd = get_unused_fd_flags(0); | |
63 | err = fd; | |
64 | if (unlikely(fd < 0)) | |
65 | goto out; | |
66 | ||
67 | h_file = ERR_PTR(-EINVAL); | |
68 | wbi = 0; | |
69 | br = NULL; | |
70 | sb = path->dentry->d_sb; | |
71 | root = sb->s_root; | |
72 | aufs_read_lock(root, AuLock_IR); | |
73 | bbot = au_sbbot(sb); | |
74 | if (wbrfd.brid >= 0) { | |
75 | wbi = au_br_index(sb, wbrfd.brid); | |
76 | if (unlikely(wbi < 0 || wbi > bbot)) | |
77 | goto out_unlock; | |
78 | } | |
79 | ||
80 | h_file = ERR_PTR(-ENOENT); | |
81 | br = au_sbr(sb, wbi); | |
82 | if (!au_br_writable(br->br_perm)) { | |
83 | if (arg) | |
84 | goto out_unlock; | |
85 | ||
86 | bindex = wbi + 1; | |
87 | wbi = -1; | |
88 | for (; bindex <= bbot; bindex++) { | |
89 | br = au_sbr(sb, bindex); | |
90 | if (au_br_writable(br->br_perm)) { | |
91 | wbi = bindex; | |
92 | br = au_sbr(sb, wbi); | |
93 | break; | |
94 | } | |
95 | } | |
96 | } | |
97 | AuDbg("wbi %d\n", wbi); | |
98 | if (wbi >= 0) | |
99 | h_file = au_h_open(root, wbi, wbrfd.oflags, NULL, | |
100 | /*force_wr*/0); | |
101 | ||
102 | out_unlock: | |
103 | aufs_read_unlock(root, AuLock_IR); | |
104 | err = PTR_ERR(h_file); | |
105 | if (IS_ERR(h_file)) | |
106 | goto out_fd; | |
107 | ||
108 | au_br_put(br); /* cf. au_h_open() */ | |
109 | fd_install(fd, h_file); | |
110 | err = fd; | |
111 | goto out; /* success */ | |
112 | ||
113 | out_fd: | |
114 | put_unused_fd(fd); | |
115 | out: | |
116 | AuTraceErr(err); | |
117 | return err; | |
118 | } | |
119 | ||
120 | /* ---------------------------------------------------------------------- */ | |
121 | ||
122 | long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg) | |
123 | { | |
124 | long err; | |
125 | struct dentry *dentry; | |
126 | ||
127 | switch (cmd) { | |
128 | case AUFS_CTL_RDU: | |
129 | case AUFS_CTL_RDU_INO: | |
130 | err = au_rdu_ioctl(file, cmd, arg); | |
131 | break; | |
132 | ||
133 | case AUFS_CTL_WBR_FD: | |
134 | err = au_wbr_fd(&file->f_path, (void __user *)arg); | |
135 | break; | |
136 | ||
137 | case AUFS_CTL_IBUSY: | |
138 | err = au_ibusy_ioctl(file, arg); | |
139 | break; | |
140 | ||
141 | case AUFS_CTL_BRINFO: | |
142 | err = au_brinfo_ioctl(file, arg); | |
143 | break; | |
144 | ||
145 | case AUFS_CTL_FHSM_FD: | |
146 | dentry = file->f_path.dentry; | |
147 | if (IS_ROOT(dentry)) | |
148 | err = au_fhsm_fd(dentry->d_sb, arg); | |
149 | else | |
150 | err = -ENOTTY; | |
151 | break; | |
152 | ||
153 | default: | |
154 | /* do not call the lower */ | |
155 | AuDbg("0x%x\n", cmd); | |
156 | err = -ENOTTY; | |
157 | } | |
158 | ||
159 | AuTraceErr(err); | |
160 | return err; | |
161 | } | |
162 | ||
163 | long aufs_ioctl_nondir(struct file *file, unsigned int cmd, unsigned long arg) | |
164 | { | |
165 | long err; | |
166 | ||
167 | switch (cmd) { | |
168 | case AUFS_CTL_MVDOWN: | |
169 | err = au_mvdown(file->f_path.dentry, (void __user *)arg); | |
170 | break; | |
171 | ||
172 | case AUFS_CTL_WBR_FD: | |
173 | err = au_wbr_fd(&file->f_path, (void __user *)arg); | |
174 | break; | |
175 | ||
176 | default: | |
177 | /* do not call the lower */ | |
178 | AuDbg("0x%x\n", cmd); | |
179 | err = -ENOTTY; | |
180 | } | |
181 | ||
182 | AuTraceErr(err); | |
183 | return err; | |
184 | } | |
185 | ||
186 | #ifdef CONFIG_COMPAT | |
187 | long aufs_compat_ioctl_dir(struct file *file, unsigned int cmd, | |
188 | unsigned long arg) | |
189 | { | |
190 | long err; | |
191 | ||
192 | switch (cmd) { | |
193 | case AUFS_CTL_RDU: | |
194 | case AUFS_CTL_RDU_INO: | |
195 | err = au_rdu_compat_ioctl(file, cmd, arg); | |
196 | break; | |
197 | ||
198 | case AUFS_CTL_IBUSY: | |
199 | err = au_ibusy_compat_ioctl(file, arg); | |
200 | break; | |
201 | ||
202 | case AUFS_CTL_BRINFO: | |
203 | err = au_brinfo_compat_ioctl(file, arg); | |
204 | break; | |
205 | ||
206 | default: | |
207 | err = aufs_ioctl_dir(file, cmd, arg); | |
208 | } | |
209 | ||
210 | AuTraceErr(err); | |
211 | return err; | |
212 | } | |
213 | ||
214 | long aufs_compat_ioctl_nondir(struct file *file, unsigned int cmd, | |
215 | unsigned long arg) | |
216 | { | |
217 | return aufs_ioctl_nondir(file, cmd, (unsigned long)compat_ptr(arg)); | |
218 | } | |
219 | #endif |