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/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