release/src-rt-6.x.4708/linux/linux-2.6.36/fs/ocfs2/ioctl.c

   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/compat.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 #include "refcounttree.h"
  26
  27 #include <linux/ext2_fs.h>
  28
  29 static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
  30 {
  31         int status;
  32
  33         status = ocfs2_inode_lock(inode, NULL, 0);
  34         if (status < 0) {
  35                 mlog_errno(status);
  36                 return status;
  37         }
  38         ocfs2_get_inode_flags(OCFS2_I(inode));
  39         *flags = OCFS2_I(inode)->ip_attr;
  40         ocfs2_inode_unlock(inode, 0);
  41
  42         mlog_exit(status);
  43         return status;
  44 }
  45
  46 static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
  47                                 unsigned mask)
  48 {
  49         struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
  50         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
  51         handle_t *handle = NULL;
  52         struct buffer_head *bh = NULL;
  53         unsigned oldflags;
  54         int status;
  55
  56         mutex_lock(&inode->i_mutex);
  57
  58         status = ocfs2_inode_lock(inode, &bh, 1);
  59         if (status < 0) {
  60                 mlog_errno(status);
  61                 goto bail;
  62         }
  63
  64         status = -EACCES;
  65         if (!is_owner_or_cap(inode))
  66                 goto bail_unlock;
  67
  68         if (!S_ISDIR(inode->i_mode))
  69                 flags &= ~OCFS2_DIRSYNC_FL;
  70
  71         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
  72         if (IS_ERR(handle)) {
  73                 status = PTR_ERR(handle);
  74                 mlog_errno(status);
  75                 goto bail_unlock;
  76         }
  77
  78         oldflags = ocfs2_inode->ip_attr;
  79         flags = flags & mask;
  80         flags |= oldflags & ~mask;
  81
  82         /*
  83          * The IMMUTABLE and APPEND_ONLY flags can only be changed by
  84          * the relevant capability.
  85          */
  86         status = -EPERM;
  87         if ((oldflags & OCFS2_IMMUTABLE_FL) || ((flags ^ oldflags) &
  88                 (OCFS2_APPEND_FL | OCFS2_IMMUTABLE_FL))) {
  89                 if (!capable(CAP_LINUX_IMMUTABLE))
  90                         goto bail_unlock;
  91         }
  92
  93         ocfs2_inode->ip_attr = flags;
  94         ocfs2_set_inode_flags(inode);
  95
  96         status = ocfs2_mark_inode_dirty(handle, inode, bh);
  97         if (status < 0)
  98                 mlog_errno(status);
  99
 100         ocfs2_commit_trans(osb, handle);
 101 bail_unlock:
 102         ocfs2_inode_unlock(inode, 1);
 103 bail:
 104         mutex_unlock(&inode->i_mutex);
 105
 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         struct reflink_arguments args;
 121         const char *old_path, *new_path;
 122         bool preserve;
 123
 124         switch (cmd) {
 125         case OCFS2_IOC_GETFLAGS:
 126                 status = ocfs2_get_inode_attr(inode, &flags);
 127                 if (status < 0)
 128                         return status;
 129
 130                 flags &= OCFS2_FL_VISIBLE;
 131                 return put_user(flags, (int __user *) arg);
 132         case OCFS2_IOC_SETFLAGS:
 133                 if (get_user(flags, (int __user *) arg))
 134                         return -EFAULT;
 135
 136                 status = mnt_want_write(filp->f_path.mnt);
 137                 if (status)
 138                         return status;
 139                 status = ocfs2_set_inode_attr(inode, flags,
 140                         OCFS2_FL_MODIFIABLE);
 141                 mnt_drop_write(filp->f_path.mnt);
 142                 return status;
 143         case OCFS2_IOC_RESVSP:
 144         case OCFS2_IOC_RESVSP64:
 145         case OCFS2_IOC_UNRESVSP:
 146         case OCFS2_IOC_UNRESVSP64:
 147                 if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
 148                         return -EFAULT;
 149
 150                 return ocfs2_change_file_space(filp, cmd, &sr);
 151         case OCFS2_IOC_GROUP_EXTEND:
 152                 if (!capable(CAP_SYS_RESOURCE))
 153                         return -EPERM;
 154
 155                 if (get_user(new_clusters, (int __user *)arg))
 156                         return -EFAULT;
 157
 158                 return ocfs2_group_extend(inode, new_clusters);
 159         case OCFS2_IOC_GROUP_ADD:
 160         case OCFS2_IOC_GROUP_ADD64:
 161                 if (!capable(CAP_SYS_RESOURCE))
 162                         return -EPERM;
 163
 164                 if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
 165                         return -EFAULT;
 166
 167                 return ocfs2_group_add(inode, &input);
 168         case OCFS2_IOC_REFLINK:
 169                 if (copy_from_user(&args, (struct reflink_arguments *)arg,
 170                                    sizeof(args)))
 171                         return -EFAULT;
 172                 old_path = (const char *)(unsigned long)args.old_path;
 173                 new_path = (const char *)(unsigned long)args.new_path;
 174                 preserve = (args.preserve != 0);
 175
 176                 return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve);
 177         default:
 178                 return -ENOTTY;
 179         }
 180 }
 181
 182 #ifdef CONFIG_COMPAT
 183 long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 184 {
 185         bool preserve;
 186         struct reflink_arguments args;
 187         struct inode *inode = file->f_path.dentry->d_inode;
 188
 189         switch (cmd) {
 190         case OCFS2_IOC32_GETFLAGS:
 191                 cmd = OCFS2_IOC_GETFLAGS;
 192                 break;
 193         case OCFS2_IOC32_SETFLAGS:
 194                 cmd = OCFS2_IOC_SETFLAGS;
 195                 break;
 196         case OCFS2_IOC_RESVSP:
 197         case OCFS2_IOC_RESVSP64:
 198         case OCFS2_IOC_UNRESVSP:
 199         case OCFS2_IOC_UNRESVSP64:
 200         case OCFS2_IOC_GROUP_EXTEND:
 201         case OCFS2_IOC_GROUP_ADD:
 202         case OCFS2_IOC_GROUP_ADD64:
 203                 break;
 204         case OCFS2_IOC_REFLINK:
 205                 if (copy_from_user(&args, (struct reflink_arguments *)arg,
 206                                    sizeof(args)))
 207                         return -EFAULT;
 208                 preserve = (args.preserve != 0);
 209
 210                 return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path),
 211                                            compat_ptr(args.new_path), preserve);
 212         default:
 213                 return -ENOIOCTLCMD;
 214         }
 215
 216         return ocfs2_ioctl(file, cmd, arg);
 217 }
 218 #endif