~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/fs/ubifs/ioctl.c

Version: ~ [ linux-5.14-rc1 ] ~ [ linux-5.13.1 ] ~ [ linux-5.12.16 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.49 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.131 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.197 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.239 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.275 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.275 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 converts 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 converts UBIFS inode flags (@UBIFS_COMPR_FL, etc) to ioctl
 82  * flags (@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 = 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(c, "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_inode(file);
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(file);
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(file);
182                 return err;
183         }
184         case FS_IOC_SET_ENCRYPTION_POLICY: {
185 #ifdef CONFIG_UBIFS_FS_ENCRYPTION
186                 struct ubifs_info *c = inode->i_sb->s_fs_info;
187 
188                 err = ubifs_enable_encryption(c);
189                 if (err)
190                         return err;
191 
192                 return fscrypt_ioctl_set_policy(file, (const void __user *)arg);
193 #else
194                 return -EOPNOTSUPP;
195 #endif
196         }
197         case FS_IOC_GET_ENCRYPTION_POLICY: {
198 #ifdef CONFIG_UBIFS_FS_ENCRYPTION
199                 return fscrypt_ioctl_get_policy(file, (void __user *)arg);
200 #else
201                 return -EOPNOTSUPP;
202 #endif
203         }
204 
205         default:
206                 return -ENOTTY;
207         }
208 }
209 
210 #ifdef CONFIG_COMPAT
211 long ubifs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
212 {
213         switch (cmd) {
214         case FS_IOC32_GETFLAGS:
215                 cmd = FS_IOC_GETFLAGS;
216                 break;
217         case FS_IOC32_SETFLAGS:
218                 cmd = FS_IOC_SETFLAGS;
219                 break;
220         case FS_IOC_SET_ENCRYPTION_POLICY:
221         case FS_IOC_GET_ENCRYPTION_POLICY:
222                 break;
223         default:
224                 return -ENOIOCTLCMD;
225         }
226         return ubifs_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
227 }
228 #endif
229 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp