1 /* 2 * linux/fs/jfs/ioctl.c 3 * 4 * Copyright (C) 2006 Herbert Poetzl 5 * adapted from Remy Card's ext2/ioctl.c 6 */ 7 8 #include <linux/fs.h> 9 #include <linux/ctype.h> 10 #include <linux/capability.h> 11 #include <linux/mount.h> 12 #include <linux/time.h> 13 #include <linux/sched.h> 14 #include <linux/blkdev.h> 15 #include <asm/current.h> 16 #include <asm/uaccess.h> 17 18 #include "jfs_filsys.h" 19 #include "jfs_debug.h" 20 #include "jfs_incore.h" 21 #include "jfs_dinode.h" 22 #include "jfs_inode.h" 23 #include "jfs_dmap.h" 24 #include "jfs_discard.h" 25 26 static struct { 27 long jfs_flag; 28 long ext2_flag; 29 } jfs_map[] = { 30 {JFS_NOATIME_FL, FS_NOATIME_FL}, 31 {JFS_DIRSYNC_FL, FS_DIRSYNC_FL}, 32 {JFS_SYNC_FL, FS_SYNC_FL}, 33 {JFS_SECRM_FL, FS_SECRM_FL}, 34 {JFS_UNRM_FL, FS_UNRM_FL}, 35 {JFS_APPEND_FL, FS_APPEND_FL}, 36 {JFS_IMMUTABLE_FL, FS_IMMUTABLE_FL}, 37 {0, 0}, 38 }; 39 40 static long jfs_map_ext2(unsigned long flags, int from) 41 { 42 int index=0; 43 long mapped=0; 44 45 while (jfs_map[index].jfs_flag) { 46 if (from) { 47 if (jfs_map[index].ext2_flag & flags) 48 mapped |= jfs_map[index].jfs_flag; 49 } else { 50 if (jfs_map[index].jfs_flag & flags) 51 mapped |= jfs_map[index].ext2_flag; 52 } 53 index++; 54 } 55 return mapped; 56 } 57 58 59 long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 60 { 61 struct inode *inode = file_inode(filp); 62 struct jfs_inode_info *jfs_inode = JFS_IP(inode); 63 unsigned int flags; 64 65 switch (cmd) { 66 case JFS_IOC_GETFLAGS: 67 jfs_get_inode_flags(jfs_inode); 68 flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE; 69 flags = jfs_map_ext2(flags, 0); 70 return put_user(flags, (int __user *) arg); 71 case JFS_IOC_SETFLAGS: { 72 unsigned int oldflags; 73 int err; 74 75 err = mnt_want_write_file(filp); 76 if (err) 77 return err; 78 79 if (!inode_owner_or_capable(inode)) { 80 err = -EACCES; 81 goto setflags_out; 82 } 83 if (get_user(flags, (int __user *) arg)) { 84 err = -EFAULT; 85 goto setflags_out; 86 } 87 88 flags = jfs_map_ext2(flags, 1); 89 if (!S_ISDIR(inode->i_mode)) 90 flags &= ~JFS_DIRSYNC_FL; 91 92 /* Is it quota file? Do not allow user to mess with it */ 93 if (IS_NOQUOTA(inode)) { 94 err = -EPERM; 95 goto setflags_out; 96 } 97 98 /* Lock against other parallel changes of flags */ 99 mutex_lock(&inode->i_mutex); 100 101 jfs_get_inode_flags(jfs_inode); 102 oldflags = jfs_inode->mode2; 103 104 /* 105 * The IMMUTABLE and APPEND_ONLY flags can only be changed by 106 * the relevant capability. 107 */ 108 if ((oldflags & JFS_IMMUTABLE_FL) || 109 ((flags ^ oldflags) & 110 (JFS_APPEND_FL | JFS_IMMUTABLE_FL))) { 111 if (!capable(CAP_LINUX_IMMUTABLE)) { 112 mutex_unlock(&inode->i_mutex); 113 err = -EPERM; 114 goto setflags_out; 115 } 116 } 117 118 flags = flags & JFS_FL_USER_MODIFIABLE; 119 flags |= oldflags & ~JFS_FL_USER_MODIFIABLE; 120 jfs_inode->mode2 = flags; 121 122 jfs_set_inode_flags(inode); 123 mutex_unlock(&inode->i_mutex); 124 inode->i_ctime = CURRENT_TIME_SEC; 125 mark_inode_dirty(inode); 126 setflags_out: 127 mnt_drop_write_file(filp); 128 return err; 129 } 130 131 case FITRIM: 132 { 133 struct super_block *sb = inode->i_sb; 134 struct request_queue *q = bdev_get_queue(sb->s_bdev); 135 struct fstrim_range range; 136 s64 ret = 0; 137 138 if (!capable(CAP_SYS_ADMIN)) 139 return -EPERM; 140 141 if (!blk_queue_discard(q)) { 142 jfs_warn("FITRIM not supported on device"); 143 return -EOPNOTSUPP; 144 } 145 146 if (copy_from_user(&range, (struct fstrim_range __user *)arg, 147 sizeof(range))) 148 return -EFAULT; 149 150 range.minlen = max_t(unsigned int, range.minlen, 151 q->limits.discard_granularity); 152 153 ret = jfs_ioc_trim(inode, &range); 154 if (ret < 0) 155 return ret; 156 157 if (copy_to_user((struct fstrim_range __user *)arg, &range, 158 sizeof(range))) 159 return -EFAULT; 160 161 return 0; 162 } 163 164 default: 165 return -ENOTTY; 166 } 167 } 168 169 #ifdef CONFIG_COMPAT 170 long jfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 171 { 172 /* While these ioctl numbers defined with 'long' and have different 173 * numbers than the 64bit ABI, 174 * the actual implementation only deals with ints and is compatible. 175 */ 176 switch (cmd) { 177 case JFS_IOC_GETFLAGS32: 178 cmd = JFS_IOC_GETFLAGS; 179 break; 180 case JFS_IOC_SETFLAGS32: 181 cmd = JFS_IOC_SETFLAGS; 182 break; 183 } 184 return jfs_ioctl(filp, cmd, arg); 185 } 186 #endif 187