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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/mount.h> |
29 | #include "ubifs.h" |
30 | |
31 | /** |
32 | * ubifs_set_inode_flags - set VFS inode flags. |
33 | * @inode: VFS inode to set flags for |
34 | * |
35 | * This function propagates flags from UBIFS inode object to VFS inode object. |
36 | */ |
37 | void ubifs_set_inode_flags(struct inode *inode) |
38 | { |
39 | unsigned int flags = ubifs_inode(inode)->flags; |
40 | |
41 | inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_DIRSYNC); |
42 | if (flags & UBIFS_SYNC_FL) |
43 | inode->i_flags |= S_SYNC; |
44 | if (flags & UBIFS_APPEND_FL) |
45 | inode->i_flags |= S_APPEND; |
46 | if (flags & UBIFS_IMMUTABLE_FL) |
47 | inode->i_flags |= S_IMMUTABLE; |
48 | if (flags & UBIFS_DIRSYNC_FL) |
49 | inode->i_flags |= S_DIRSYNC; |
50 | } |
51 | |
52 | /* |
53 | * ioctl2ubifs - convert ioctl inode flags to UBIFS inode flags. |
54 | * @ioctl_flags: flags to convert |
55 | * |
56 | * This function convert ioctl flags (@FS_COMPR_FL, etc) to UBIFS inode flags |
57 | * (@UBIFS_COMPR_FL, etc). |
58 | */ |
59 | static int ioctl2ubifs(int ioctl_flags) |
60 | { |
61 | int ubifs_flags = 0; |
62 | |
63 | if (ioctl_flags & FS_COMPR_FL) |
64 | ubifs_flags |= UBIFS_COMPR_FL; |
65 | if (ioctl_flags & FS_SYNC_FL) |
66 | ubifs_flags |= UBIFS_SYNC_FL; |
67 | if (ioctl_flags & FS_APPEND_FL) |
68 | ubifs_flags |= UBIFS_APPEND_FL; |
69 | if (ioctl_flags & FS_IMMUTABLE_FL) |
70 | ubifs_flags |= UBIFS_IMMUTABLE_FL; |
71 | if (ioctl_flags & FS_DIRSYNC_FL) |
72 | ubifs_flags |= UBIFS_DIRSYNC_FL; |
73 | |
74 | return ubifs_flags; |
75 | } |
76 | |
77 | /* |
78 | * ubifs2ioctl - convert UBIFS inode flags to ioctl inode flags. |
79 | * @ubifs_flags: flags to convert |
80 | * |
81 | * This function convert UBIFS (@UBIFS_COMPR_FL, etc) to ioctl flags |
82 | * (@FS_COMPR_FL, etc). |
83 | */ |
84 | static int ubifs2ioctl(int ubifs_flags) |
85 | { |
86 | int ioctl_flags = 0; |
87 | |
88 | if (ubifs_flags & UBIFS_COMPR_FL) |
89 | ioctl_flags |= FS_COMPR_FL; |
90 | if (ubifs_flags & UBIFS_SYNC_FL) |
91 | ioctl_flags |= FS_SYNC_FL; |
92 | if (ubifs_flags & UBIFS_APPEND_FL) |
93 | ioctl_flags |= FS_APPEND_FL; |
94 | if (ubifs_flags & UBIFS_IMMUTABLE_FL) |
95 | ioctl_flags |= FS_IMMUTABLE_FL; |
96 | if (ubifs_flags & UBIFS_DIRSYNC_FL) |
97 | ioctl_flags |= FS_DIRSYNC_FL; |
98 | |
99 | return ioctl_flags; |
100 | } |
101 | |
102 | static int setflags(struct inode *inode, int flags) |
103 | { |
104 | int oldflags, err, release; |
105 | struct ubifs_inode *ui = ubifs_inode(inode); |
106 | struct ubifs_info *c = inode->i_sb->s_fs_info; |
107 | struct ubifs_budget_req req = { .dirtied_ino = 1, |
108 | .dirtied_ino_d = ui->data_len }; |
109 | |
110 | err = ubifs_budget_space(c, &req); |
111 | if (err) |
112 | return err; |
113 | |
114 | /* |
115 | * The IMMUTABLE and APPEND_ONLY flags can only be changed by |
116 | * the relevant capability. |
117 | */ |
118 | mutex_lock(&ui->ui_mutex); |
119 | oldflags = ubifs2ioctl(ui->flags); |
120 | if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { |
121 | if (!capable(CAP_LINUX_IMMUTABLE)) { |
122 | err = -EPERM; |
123 | goto out_unlock; |
124 | } |
125 | } |
126 | |
127 | ui->flags = ioctl2ubifs(flags); |
128 | ubifs_set_inode_flags(inode); |
129 | inode->i_ctime = ubifs_current_time(inode); |
130 | release = ui->dirty; |
131 | mark_inode_dirty_sync(inode); |
132 | mutex_unlock(&ui->ui_mutex); |
133 | |
134 | if (release) |
135 | ubifs_release_budget(c, &req); |
136 | if (IS_SYNC(inode)) |
137 | err = write_inode_now(inode, 1); |
138 | return err; |
139 | |
140 | out_unlock: |
141 | ubifs_err("can't modify inode %lu attributes", inode->i_ino); |
142 | mutex_unlock(&ui->ui_mutex); |
143 | ubifs_release_budget(c, &req); |
144 | return err; |
145 | } |
146 | |
147 | long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
148 | { |
149 | int flags, err; |
150 | struct inode *inode = file->f_path.dentry->d_inode; |
151 | |
152 | switch (cmd) { |
153 | case FS_IOC_GETFLAGS: |
154 | flags = ubifs2ioctl(ubifs_inode(inode)->flags); |
155 | |
156 | dbg_gen("get flags: %#x, i_flags %#x", flags, inode->i_flags); |
157 | return put_user(flags, (int __user *) arg); |
158 | |
159 | case FS_IOC_SETFLAGS: { |
160 | if (IS_RDONLY(inode)) |
161 | return -EROFS; |
162 | |
163 | if (!inode_owner_or_capable(inode)) |
164 | return -EACCES; |
165 | |
166 | if (get_user(flags, (int __user *) arg)) |
167 | return -EFAULT; |
168 | |
169 | if (!S_ISDIR(inode->i_mode)) |
170 | flags &= ~FS_DIRSYNC_FL; |
171 | |
172 | /* |
173 | * Make sure the file-system is read-write and make sure it |
174 | * will not become read-only while we are changing the flags. |
175 | */ |
176 | err = mnt_want_write(file->f_path.mnt); |
177 | if (err) |
178 | return err; |
179 | dbg_gen("set flags: %#x, i_flags %#x", flags, inode->i_flags); |
180 | err = setflags(inode, flags); |
181 | mnt_drop_write(file->f_path.mnt); |
182 | return err; |
183 | } |
184 | |
185 | default: |
186 | return -ENOTTY; |
187 | } |
188 | } |
189 | |
190 | #ifdef CONFIG_COMPAT |
191 | long ubifs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
192 | { |
193 | switch (cmd) { |
194 | case FS_IOC32_GETFLAGS: |
195 | cmd = FS_IOC_GETFLAGS; |
196 | break; |
197 | case FS_IOC32_SETFLAGS: |
198 | cmd = FS_IOC_SETFLAGS; |
199 | break; |
200 | default: |
201 | return -ENOIOCTLCMD; |
202 | } |
203 | return ubifs_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); |
204 | } |
205 | #endif |
206 |
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