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1e51764a AB |
1 | /* |
2 | * This file is part of UBIFS. | |
3 | * | |
4 | * Copyright (C) 2006-2008 Nokia Corporation. | |
5 | * Copyright (C) 2006, 2007 University of Szeged, Hungary | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License version 2 as published by | |
9 | * the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | * more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along with | |
17 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
18 | * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | * | |
20 | * Authors: Zoltan Sogor | |
21 | * Artem Bityutskiy (Битюцкий Артём) | |
22 | * Adrian Hunter | |
23 | */ | |
24 | ||
25 | /* This file implements EXT2-compatible extended attribute ioctl() calls */ | |
26 | ||
27 | #include <linux/compat.h> | |
28 | #include <linux/smp_lock.h> | |
29 | #include <linux/mount.h> | |
30 | #include "ubifs.h" | |
31 | ||
32 | /** | |
33 | * ubifs_set_inode_flags - set VFS inode flags. | |
34 | * @inode: VFS inode to set flags for | |
35 | * | |
36 | * This function propagates flags from UBIFS inode object to VFS inode object. | |
37 | */ | |
38 | void ubifs_set_inode_flags(struct inode *inode) | |
39 | { | |
40 | unsigned int flags = ubifs_inode(inode)->flags; | |
41 | ||
42 | inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_DIRSYNC); | |
43 | if (flags & UBIFS_SYNC_FL) | |
44 | inode->i_flags |= S_SYNC; | |
45 | if (flags & UBIFS_APPEND_FL) | |
46 | inode->i_flags |= S_APPEND; | |
47 | if (flags & UBIFS_IMMUTABLE_FL) | |
48 | inode->i_flags |= S_IMMUTABLE; | |
49 | if (flags & UBIFS_DIRSYNC_FL) | |
50 | inode->i_flags |= S_DIRSYNC; | |
51 | } | |
52 | ||
53 | /* | |
54 | * ioctl2ubifs - convert ioctl inode flags to UBIFS inode flags. | |
55 | * @ioctl_flags: flags to convert | |
56 | * | |
57 | * This function convert ioctl flags (@FS_COMPR_FL, etc) to UBIFS inode flags | |
58 | * (@UBIFS_COMPR_FL, etc). | |
59 | */ | |
60 | static int ioctl2ubifs(int ioctl_flags) | |
61 | { | |
62 | int ubifs_flags = 0; | |
63 | ||
64 | if (ioctl_flags & FS_COMPR_FL) | |
65 | ubifs_flags |= UBIFS_COMPR_FL; | |
66 | if (ioctl_flags & FS_SYNC_FL) | |
67 | ubifs_flags |= UBIFS_SYNC_FL; | |
68 | if (ioctl_flags & FS_APPEND_FL) | |
69 | ubifs_flags |= UBIFS_APPEND_FL; | |
70 | if (ioctl_flags & FS_IMMUTABLE_FL) | |
71 | ubifs_flags |= UBIFS_IMMUTABLE_FL; | |
72 | if (ioctl_flags & FS_DIRSYNC_FL) | |
73 | ubifs_flags |= UBIFS_DIRSYNC_FL; | |
74 | ||
75 | return ubifs_flags; | |
76 | } | |
77 | ||
78 | /* | |
79 | * ubifs2ioctl - convert UBIFS inode flags to ioctl inode flags. | |
80 | * @ubifs_flags: flags to convert | |
81 | * | |
82 | * This function convert UBIFS (@UBIFS_COMPR_FL, etc) to ioctl flags | |
83 | * (@FS_COMPR_FL, etc). | |
84 | */ | |
85 | static int ubifs2ioctl(int ubifs_flags) | |
86 | { | |
87 | int ioctl_flags = 0; | |
88 | ||
89 | if (ubifs_flags & UBIFS_COMPR_FL) | |
90 | ioctl_flags |= FS_COMPR_FL; | |
91 | if (ubifs_flags & UBIFS_SYNC_FL) | |
92 | ioctl_flags |= FS_SYNC_FL; | |
93 | if (ubifs_flags & UBIFS_APPEND_FL) | |
94 | ioctl_flags |= FS_APPEND_FL; | |
95 | if (ubifs_flags & UBIFS_IMMUTABLE_FL) | |
96 | ioctl_flags |= FS_IMMUTABLE_FL; | |
97 | if (ubifs_flags & UBIFS_DIRSYNC_FL) | |
98 | ioctl_flags |= FS_DIRSYNC_FL; | |
99 | ||
100 | return ioctl_flags; | |
101 | } | |
102 | ||
103 | static int setflags(struct inode *inode, int flags) | |
104 | { | |
105 | int oldflags, err, release; | |
106 | struct ubifs_inode *ui = ubifs_inode(inode); | |
107 | struct ubifs_info *c = inode->i_sb->s_fs_info; | |
108 | struct ubifs_budget_req req = { .dirtied_ino = 1, | |
109 | .dirtied_ino_d = ui->data_len }; | |
110 | ||
111 | err = ubifs_budget_space(c, &req); | |
112 | if (err) | |
113 | return err; | |
114 | ||
115 | /* | |
116 | * The IMMUTABLE and APPEND_ONLY flags can only be changed by | |
117 | * the relevant capability. | |
118 | */ | |
119 | mutex_lock(&ui->ui_mutex); | |
120 | oldflags = ubifs2ioctl(ui->flags); | |
121 | if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { | |
122 | if (!capable(CAP_LINUX_IMMUTABLE)) { | |
123 | err = -EPERM; | |
124 | goto out_unlock; | |
125 | } | |
126 | } | |
127 | ||
128 | ui->flags = ioctl2ubifs(flags); | |
129 | ubifs_set_inode_flags(inode); | |
130 | inode->i_ctime = ubifs_current_time(inode); | |
131 | release = ui->dirty; | |
132 | mark_inode_dirty_sync(inode); | |
133 | mutex_unlock(&ui->ui_mutex); | |
134 | ||
135 | if (release) | |
136 | ubifs_release_budget(c, &req); | |
137 | if (IS_SYNC(inode)) | |
138 | err = write_inode_now(inode, 1); | |
139 | return err; | |
140 | ||
141 | out_unlock: | |
142 | ubifs_err("can't modify inode %lu attributes", inode->i_ino); | |
143 | mutex_unlock(&ui->ui_mutex); | |
144 | ubifs_release_budget(c, &req); | |
145 | return err; | |
146 | } | |
147 | ||
148 | long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
149 | { | |
150 | int flags, err; | |
151 | struct inode *inode = file->f_path.dentry->d_inode; | |
152 | ||
153 | switch (cmd) { | |
154 | case FS_IOC_GETFLAGS: | |
155 | flags = ubifs2ioctl(ubifs_inode(inode)->flags); | |
156 | ||
a9f2fc0e | 157 | dbg_gen("get flags: %#x, i_flags %#x", flags, inode->i_flags); |
1e51764a AB |
158 | return put_user(flags, (int __user *) arg); |
159 | ||
160 | case FS_IOC_SETFLAGS: { | |
161 | if (IS_RDONLY(inode)) | |
162 | return -EROFS; | |
163 | ||
164 | if (!is_owner_or_cap(inode)) | |
165 | return -EACCES; | |
166 | ||
167 | if (get_user(flags, (int __user *) arg)) | |
168 | return -EFAULT; | |
169 | ||
170 | if (!S_ISDIR(inode->i_mode)) | |
171 | flags &= ~FS_DIRSYNC_FL; | |
172 | ||
173 | /* | |
174 | * Make sure the file-system is read-write and make sure it | |
175 | * will not become read-only while we are changing the flags. | |
176 | */ | |
177 | err = mnt_want_write(file->f_path.mnt); | |
178 | if (err) | |
179 | return err; | |
a9f2fc0e | 180 | dbg_gen("set flags: %#x, i_flags %#x", flags, inode->i_flags); |
1e51764a AB |
181 | err = setflags(inode, flags); |
182 | mnt_drop_write(file->f_path.mnt); | |
183 | return err; | |
184 | } | |
185 | ||
186 | default: | |
187 | return -ENOTTY; | |
188 | } | |
189 | } | |
190 | ||
191 | #ifdef CONFIG_COMPAT | |
192 | long ubifs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
193 | { | |
194 | switch (cmd) { | |
195 | case FS_IOC32_GETFLAGS: | |
196 | cmd = FS_IOC_GETFLAGS; | |
197 | break; | |
198 | case FS_IOC32_SETFLAGS: | |
199 | cmd = FS_IOC_SETFLAGS; | |
200 | break; | |
201 | default: | |
202 | return -ENOIOCTLCMD; | |
203 | } | |
204 | return ubifs_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
205 | } | |
206 | #endif |