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
  11 #define MLOG_MASK_PREFIX ML_INODE
  12 #include <cluster/masklog.h>
  13
  14 #include "ocfs2.h"
  15 #include "alloc.h"
  16 #include "dlmglue.h"
  17 #include "inode.h"
  18 #include "journal.h"
  19
  20 #include "ocfs2_fs.h"
  21 #include "ioctl.h"
  22
  23 #include <linux/ext2_fs.h>
  24
  25 static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
  26 {
  27         int status;
  28
  29         status = ocfs2_meta_lock(inode, NULL, NULL, 0);
  30         if (status < 0) {
  31                 mlog_errno(status);
  32                 return status;
  33         }
  34         *flags = OCFS2_I(inode)->ip_attr;
  35         ocfs2_meta_unlock(inode, 0);
  36
  37         mlog_exit(status);
  38         return status;
  39 }
  40
  41 static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
  42                                 unsigned mask)
  43 {
  44         struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
  45         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
  46         struct ocfs2_journal_handle *handle = NULL;
  47         struct buffer_head *bh = NULL;
  48         unsigned oldflags;
  49         int status;
  50
  51         mutex_lock(&inode->i_mutex);
  52
  53         status = ocfs2_meta_lock(inode, NULL, &bh, 1);
  54         if (status < 0) {
  55                 mlog_errno(status);
  56                 goto bail;
  57         }
  58
  59         status = -EROFS;
  60         if (IS_RDONLY(inode))
  61                 goto bail_unlock;
  62
  63         status = -EACCES;
  64         if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
  65                 goto bail_unlock;
  66
  67         if (!S_ISDIR(inode->i_mode))
  68                 flags &= ~OCFS2_DIRSYNC_FL;
  69
  70         handle = ocfs2_start_trans(osb, NULL, 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(handle);
 100 bail_unlock:
 101         ocfs2_meta_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 int ocfs2_ioctl(struct inode * inode, struct file * filp,
 113         unsigned int cmd, unsigned long arg)
 114 {
 115         unsigned int flags;
 116         int status;
 117
 118         switch (cmd) {
 119         case OCFS2_IOC_GETFLAGS:
 120                 status = ocfs2_get_inode_attr(inode, &flags);
 121                 if (status < 0)
 122                         return status;
 123
 124                 flags &= OCFS2_FL_VISIBLE;
 125                 return put_user(flags, (int __user *) arg);
 126         case OCFS2_IOC_SETFLAGS:
 127                 if (get_user(flags, (int __user *) arg))
 128                         return -EFAULT;
 129
 130                 return ocfs2_set_inode_attr(inode, flags,
 131                         OCFS2_FL_MODIFIABLE);
 132         default:
 133                 return -ENOTTY;
 134         }
 135 }
 136