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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 | // SPDX-License-Identifier: GPL-2.0 /* * linux/fs/ext2/ioctl.c * * Copyright (C) 1993, 1994, 1995 * Remy Card (card@masi.ibp.fr) * Laboratoire MASI - Institut Blaise Pascal * Universite Pierre et Marie Curie (Paris VI) */ #include "ext2.h" #include <linux/capability.h> #include <linux/time.h> #include <linux/sched.h> #include <linux/compat.h> #include <linux/mount.h> #include <asm/current.h> #include <linux/uaccess.h> long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { struct inode *inode = file_inode(filp); struct ext2_inode_info *ei = EXT2_I(inode); unsigned int flags; unsigned short rsv_window_size; int ret; ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg); switch (cmd) { case EXT2_IOC_GETFLAGS: flags = ei->i_flags & EXT2_FL_USER_VISIBLE; return put_user(flags, (int __user *) arg); case EXT2_IOC_SETFLAGS: { unsigned int oldflags; ret = mnt_want_write_file(filp); if (ret) return ret; if (!inode_owner_or_capable(inode)) { ret = -EACCES; goto setflags_out; } if (get_user(flags, (int __user *) arg)) { ret = -EFAULT; goto setflags_out; } flags = ext2_mask_flags(inode->i_mode, flags); inode_lock(inode); /* Is it quota file? Do not allow user to mess with it */ if (IS_NOQUOTA(inode)) { inode_unlock(inode); ret = -EPERM; goto setflags_out; } oldflags = ei->i_flags; ret = vfs_ioc_setflags_prepare(inode, oldflags, flags); if (ret) { inode_unlock(inode); goto setflags_out; } flags = flags & EXT2_FL_USER_MODIFIABLE; flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE; ei->i_flags = flags; ext2_set_inode_flags(inode); inode->i_ctime = current_time(inode); inode_unlock(inode); mark_inode_dirty(inode); setflags_out: mnt_drop_write_file(filp); return ret; } case EXT2_IOC_GETVERSION: return put_user(inode->i_generation, (int __user *) arg); case EXT2_IOC_SETVERSION: { __u32 generation; if (!inode_owner_or_capable(inode)) return -EPERM; ret = mnt_want_write_file(filp); if (ret) return ret; if (get_user(generation, (int __user *) arg)) { ret = -EFAULT; goto setversion_out; } inode_lock(inode); inode->i_ctime = current_time(inode); inode->i_generation = generation; inode_unlock(inode); mark_inode_dirty(inode); setversion_out: mnt_drop_write_file(filp); return ret; } case EXT2_IOC_GETRSVSZ: if (test_opt(inode->i_sb, RESERVATION) && S_ISREG(inode->i_mode) && ei->i_block_alloc_info) { rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size; return put_user(rsv_window_size, (int __user *)arg); } return -ENOTTY; case EXT2_IOC_SETRSVSZ: { if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode)) return -ENOTTY; if (!inode_owner_or_capable(inode)) return -EACCES; if (get_user(rsv_window_size, (int __user *)arg)) return -EFAULT; ret = mnt_want_write_file(filp); if (ret) return ret; if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS) rsv_window_size = EXT2_MAX_RESERVE_BLOCKS; /* * need to allocate reservation structure for this inode * before set the window size */ /* * XXX What lock should protect the rsv_goal_size? * Accessed in ext2_get_block only. ext3 uses i_truncate. */ mutex_lock(&ei->truncate_mutex); if (!ei->i_block_alloc_info) ext2_init_block_alloc_info(inode); if (ei->i_block_alloc_info){ struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node; rsv->rsv_goal_size = rsv_window_size; } else { ret = -ENOMEM; } mutex_unlock(&ei->truncate_mutex); mnt_drop_write_file(filp); return ret; } default: return -ENOTTY; } } #ifdef CONFIG_COMPAT long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { /* These are just misnamed, they actually get/put from/to user an int */ switch (cmd) { case EXT2_IOC32_GETFLAGS: cmd = EXT2_IOC_GETFLAGS; break; case EXT2_IOC32_SETFLAGS: cmd = EXT2_IOC_SETFLAGS; break; case EXT2_IOC32_GETVERSION: cmd = EXT2_IOC_GETVERSION; break; case EXT2_IOC32_SETVERSION: cmd = EXT2_IOC_SETVERSION; break; default: return -ENOIOCTLCMD; } return ext2_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); } #endif |