1 /* 2 * linux/fs/ocfs2/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/mount.h> 10 #include <linux/smp_lock.h> 11 12 #define MLOG_MASK_PREFIX ML_INODE 13 #include <cluster/masklog.h> 14 15 #include "ocfs2.h" 16 #include "alloc.h" 17 #include "dlmglue.h" 18 #include "file.h" 19 #include "inode.h" 20 #include "journal.h" 21 22 #include "ocfs2_fs.h" 23 #include "ioctl.h" 24 #include "resize.h" 25 26 #include <linux/ext2_fs.h> 27 28 static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags) 29 { 30 int status; 31 32 status = ocfs2_inode_lock(inode, NULL, 0); 33 if (status < 0) { 34 mlog_errno(status); 35 return status; 36 } 37 ocfs2_get_inode_flags(OCFS2_I(inode)); 38 *flags = OCFS2_I(inode)->ip_attr; 39 ocfs2_inode_unlock(inode, 0); 40 41 mlog_exit(status); 42 return status; 43 } 44 45 static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags, 46 unsigned mask) 47 { 48 struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode); 49 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 50 handle_t *handle = NULL; 51 struct buffer_head *bh = NULL; 52 unsigned oldflags; 53 int status; 54 55 mutex_lock(&inode->i_mutex); 56 57 status = ocfs2_inode_lock(inode, &bh, 1); 58 if (status < 0) { 59 mlog_errno(status); 60 goto bail; 61 } 62 63 status = -EACCES; 64 if (!is_owner_or_cap(inode)) 65 goto bail_unlock; 66 67 if (!S_ISDIR(inode->i_mode)) 68 flags &= ~OCFS2_DIRSYNC_FL; 69 70 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); 71 if (IS_ERR(handle)) { 72 status = PTR_ERR(handle); 73 mlog_errno(status); 74 goto bail_unlock; 75 } 76 77 oldflags = ocfs2_inode->ip_attr; 78 flags = flags & mask; 79 flags |= oldflags & ~mask; 80 81 /* 82 * The IMMUTABLE and APPEND_ONLY flags can only be changed by 83 * the relevant capability. 84 */ 85 status = -EPERM; 86 if ((oldflags & OCFS2_IMMUTABLE_FL) || ((flags ^ oldflags) & 87 (OCFS2_APPEND_FL | OCFS2_IMMUTABLE_FL))) { 88 if (!capable(CAP_LINUX_IMMUTABLE)) 89 goto bail_unlock; 90 } 91 92 ocfs2_inode->ip_attr = flags; 93 ocfs2_set_inode_flags(inode); 94 95 status = ocfs2_mark_inode_dirty(handle, inode, bh); 96 if (status < 0) 97 mlog_errno(status); 98 99 ocfs2_commit_trans(osb, handle); 100 bail_unlock: 101 ocfs2_inode_unlock(inode, 1); 102 bail: 103 mutex_unlock(&inode->i_mutex); 104 105 if (bh) 106 brelse(bh); 107 108 mlog_exit(status); 109 return status; 110 } 111 112 long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 113 { 114 struct inode *inode = filp->f_path.dentry->d_inode; 115 unsigned int flags; 116 int new_clusters; 117 int status; 118 struct ocfs2_space_resv sr; 119 struct ocfs2_new_group_input input; 120 121 switch (cmd) { 122 case OCFS2_IOC_GETFLAGS: 123 status = ocfs2_get_inode_attr(inode, &flags); 124 if (status < 0) 125 return status; 126 127 flags &= OCFS2_FL_VISIBLE; 128 return put_user(flags, (int __user *) arg); 129 case OCFS2_IOC_SETFLAGS: 130 if (get_user(flags, (int __user *) arg)) 131 return -EFAULT; 132 133 status = mnt_want_write(filp->f_path.mnt); 134 if (status) 135 return status; 136 status = ocfs2_set_inode_attr(inode, flags, 137 OCFS2_FL_MODIFIABLE); 138 mnt_drop_write(filp->f_path.mnt); 139 return status; 140 case OCFS2_IOC_RESVSP: 141 case OCFS2_IOC_RESVSP64: 142 case OCFS2_IOC_UNRESVSP: 143 case OCFS2_IOC_UNRESVSP64: 144 if (copy_from_user(&sr, (int __user *) arg, sizeof(sr))) 145 return -EFAULT; 146 147 return ocfs2_change_file_space(filp, cmd, &sr); 148 case OCFS2_IOC_GROUP_EXTEND: 149 if (!capable(CAP_SYS_RESOURCE)) 150 return -EPERM; 151 152 if (get_user(new_clusters, (int __user *)arg)) 153 return -EFAULT; 154 155 return ocfs2_group_extend(inode, new_clusters); 156 case OCFS2_IOC_GROUP_ADD: 157 case OCFS2_IOC_GROUP_ADD64: 158 if (!capable(CAP_SYS_RESOURCE)) 159 return -EPERM; 160 161 if (copy_from_user(&input, (int __user *) arg, sizeof(input))) 162 return -EFAULT; 163 164 return ocfs2_group_add(inode, &input); 165 default: 166 return -ENOTTY; 167 } 168 } 169 170 #ifdef CONFIG_COMPAT 171 long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg) 172 { 173 switch (cmd) { 174 case OCFS2_IOC32_GETFLAGS: 175 cmd = OCFS2_IOC_GETFLAGS; 176 break; 177 case OCFS2_IOC32_SETFLAGS: 178 cmd = OCFS2_IOC_SETFLAGS; 179 break; 180 case OCFS2_IOC_RESVSP: 181 case OCFS2_IOC_RESVSP64: 182 case OCFS2_IOC_UNRESVSP: 183 case OCFS2_IOC_UNRESVSP64: 184 case OCFS2_IOC_GROUP_EXTEND: 185 case OCFS2_IOC_GROUP_ADD: 186 case OCFS2_IOC_GROUP_ADD64: 187 break; 188 default: 189 return -ENOIOCTLCMD; 190 } 191 192 return ocfs2_ioctl(file, cmd, arg); 193 } 194 #endif 195