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 } 136 137