| 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * linux/fs/jfs/ioctl.c |
| 4 | * |
| 5 | * Copyright (C) 2006 Herbert Poetzl |
| 6 | * adapted from Remy Card's ext2/ioctl.c |
| 7 | */ |
| 8 | |
| 9 | #include <linux/fs.h> |
| 10 | #include <linux/ctype.h> |
| 11 | #include <linux/capability.h> |
| 12 | #include <linux/mount.h> |
| 13 | #include <linux/time.h> |
| 14 | #include <linux/sched.h> |
| 15 | #include <linux/blkdev.h> |
| 16 | #include <asm/current.h> |
| 17 | #include <linux/uaccess.h> |
| 18 | |
| 19 | #include "jfs_filsys.h" |
| 20 | #include "jfs_debug.h" |
| 21 | #include "jfs_incore.h" |
| 22 | #include "jfs_dinode.h" |
| 23 | #include "jfs_inode.h" |
| 24 | #include "jfs_dmap.h" |
| 25 | #include "jfs_discard.h" |
| 26 | |
| 27 | static struct { |
| 28 | long jfs_flag; |
| 29 | long ext2_flag; |
| 30 | } jfs_map[] = { |
| 31 | {JFS_NOATIME_FL, FS_NOATIME_FL}, |
| 32 | {JFS_DIRSYNC_FL, FS_DIRSYNC_FL}, |
| 33 | {JFS_SYNC_FL, FS_SYNC_FL}, |
| 34 | {JFS_SECRM_FL, FS_SECRM_FL}, |
| 35 | {JFS_UNRM_FL, FS_UNRM_FL}, |
| 36 | {JFS_APPEND_FL, FS_APPEND_FL}, |
| 37 | {JFS_IMMUTABLE_FL, FS_IMMUTABLE_FL}, |
| 38 | {0, 0}, |
| 39 | }; |
| 40 | |
| 41 | static long jfs_map_ext2(unsigned long flags, int from) |
| 42 | { |
| 43 | int index=0; |
| 44 | long mapped=0; |
| 45 | |
| 46 | while (jfs_map[index].jfs_flag) { |
| 47 | if (from) { |
| 48 | if (jfs_map[index].ext2_flag & flags) |
| 49 | mapped |= jfs_map[index].jfs_flag; |
| 50 | } else { |
| 51 | if (jfs_map[index].jfs_flag & flags) |
| 52 | mapped |= jfs_map[index].ext2_flag; |
| 53 | } |
| 54 | index++; |
| 55 | } |
| 56 | return mapped; |
| 57 | } |
| 58 | |
| 59 | |
| 60 | long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
| 61 | { |
| 62 | struct inode *inode = file_inode(filp); |
| 63 | struct jfs_inode_info *jfs_inode = JFS_IP(inode); |
| 64 | unsigned int flags; |
| 65 | |
| 66 | switch (cmd) { |
| 67 | case JFS_IOC_GETFLAGS: |
| 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 | inode_lock(inode); |
| 100 | |
| 101 | oldflags = jfs_inode->mode2; |
| 102 | |
| 103 | /* |
| 104 | * The IMMUTABLE and APPEND_ONLY flags can only be changed by |
| 105 | * the relevant capability. |
| 106 | */ |
| 107 | if ((oldflags & JFS_IMMUTABLE_FL) || |
| 108 | ((flags ^ oldflags) & |
| 109 | (JFS_APPEND_FL | JFS_IMMUTABLE_FL))) { |
| 110 | if (!capable(CAP_LINUX_IMMUTABLE)) { |
| 111 | inode_unlock(inode); |
| 112 | err = -EPERM; |
| 113 | goto setflags_out; |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | flags = flags & JFS_FL_USER_MODIFIABLE; |
| 118 | flags |= oldflags & ~JFS_FL_USER_MODIFIABLE; |
| 119 | jfs_inode->mode2 = flags; |
| 120 | |
| 121 | jfs_set_inode_flags(inode); |
| 122 | inode_unlock(inode); |
| 123 | inode->i_ctime = current_time(inode); |
| 124 | mark_inode_dirty(inode); |
| 125 | setflags_out: |
| 126 | mnt_drop_write_file(filp); |
| 127 | return err; |
| 128 | } |
| 129 | |
| 130 | case FITRIM: |
| 131 | { |
| 132 | struct super_block *sb = inode->i_sb; |
| 133 | struct request_queue *q = bdev_get_queue(sb->s_bdev); |
| 134 | struct fstrim_range range; |
| 135 | s64 ret = 0; |
| 136 | |
| 137 | if (!capable(CAP_SYS_ADMIN)) |
| 138 | return -EPERM; |
| 139 | |
| 140 | if (!blk_queue_discard(q)) { |
| 141 | jfs_warn("FITRIM not supported on device"); |
| 142 | return -EOPNOTSUPP; |
| 143 | } |
| 144 | |
| 145 | if (copy_from_user(&range, (struct fstrim_range __user *)arg, |
| 146 | sizeof(range))) |
| 147 | return -EFAULT; |
| 148 | |
| 149 | range.minlen = max_t(unsigned int, range.minlen, |
| 150 | q->limits.discard_granularity); |
| 151 | |
| 152 | ret = jfs_ioc_trim(inode, &range); |
| 153 | if (ret < 0) |
| 154 | return ret; |
| 155 | |
| 156 | if (copy_to_user((struct fstrim_range __user *)arg, &range, |
| 157 | sizeof(range))) |
| 158 | return -EFAULT; |
| 159 | |
| 160 | return 0; |
| 161 | } |
| 162 | |
| 163 | default: |
| 164 | return -ENOTTY; |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | #ifdef CONFIG_COMPAT |
| 169 | long jfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
| 170 | { |
| 171 | /* While these ioctl numbers defined with 'long' and have different |
| 172 | * numbers than the 64bit ABI, |
| 173 | * the actual implementation only deals with ints and is compatible. |
| 174 | */ |
| 175 | switch (cmd) { |
| 176 | case JFS_IOC_GETFLAGS32: |
| 177 | cmd = JFS_IOC_GETFLAGS; |
| 178 | break; |
| 179 | case JFS_IOC_SETFLAGS32: |
| 180 | cmd = JFS_IOC_SETFLAGS; |
| 181 | break; |
| 182 | } |
| 183 | return jfs_ioctl(filp, cmd, arg); |
| 184 | } |
| 185 | #endif |