161 lines
3.1 KiB
C
161 lines
3.1 KiB
C
/*
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* linux/fs/ocfs2/ioctl.c
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*
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* Copyright (C) 2006 Herbert Poetzl
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* adapted from Remy Card's ext2/ioctl.c
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*/
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#include <linux/fs.h>
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#include <linux/mount.h>
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#define MLOG_MASK_PREFIX ML_INODE
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "alloc.h"
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#include "dlmglue.h"
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#include "inode.h"
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#include "journal.h"
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#include "ocfs2_fs.h"
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#include "ioctl.h"
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#include <linux/ext2_fs.h>
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static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
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{
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int status;
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status = ocfs2_meta_lock(inode, NULL, 0);
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if (status < 0) {
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mlog_errno(status);
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return status;
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}
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ocfs2_get_inode_flags(OCFS2_I(inode));
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*flags = OCFS2_I(inode)->ip_attr;
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ocfs2_meta_unlock(inode, 0);
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mlog_exit(status);
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return status;
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}
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static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
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unsigned mask)
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{
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struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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handle_t *handle = NULL;
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struct buffer_head *bh = NULL;
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unsigned oldflags;
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int status;
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mutex_lock(&inode->i_mutex);
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status = ocfs2_meta_lock(inode, &bh, 1);
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if (status < 0) {
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mlog_errno(status);
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goto bail;
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}
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status = -EROFS;
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if (IS_RDONLY(inode))
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goto bail_unlock;
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status = -EACCES;
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if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
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goto bail_unlock;
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if (!S_ISDIR(inode->i_mode))
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flags &= ~OCFS2_DIRSYNC_FL;
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handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
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if (IS_ERR(handle)) {
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status = PTR_ERR(handle);
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mlog_errno(status);
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goto bail_unlock;
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}
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oldflags = ocfs2_inode->ip_attr;
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flags = flags & mask;
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flags |= oldflags & ~mask;
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/*
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* The IMMUTABLE and APPEND_ONLY flags can only be changed by
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* the relevant capability.
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*/
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status = -EPERM;
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if ((oldflags & OCFS2_IMMUTABLE_FL) || ((flags ^ oldflags) &
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(OCFS2_APPEND_FL | OCFS2_IMMUTABLE_FL))) {
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if (!capable(CAP_LINUX_IMMUTABLE))
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goto bail_unlock;
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}
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ocfs2_inode->ip_attr = flags;
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ocfs2_set_inode_flags(inode);
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status = ocfs2_mark_inode_dirty(handle, inode, bh);
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if (status < 0)
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mlog_errno(status);
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ocfs2_commit_trans(osb, handle);
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bail_unlock:
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ocfs2_meta_unlock(inode, 1);
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bail:
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mutex_unlock(&inode->i_mutex);
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if (bh)
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brelse(bh);
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mlog_exit(status);
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return status;
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}
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int ocfs2_ioctl(struct inode * inode, struct file * filp,
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unsigned int cmd, unsigned long arg)
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{
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unsigned int flags;
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int status;
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switch (cmd) {
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case OCFS2_IOC_GETFLAGS:
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status = ocfs2_get_inode_attr(inode, &flags);
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if (status < 0)
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return status;
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flags &= OCFS2_FL_VISIBLE;
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return put_user(flags, (int __user *) arg);
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case OCFS2_IOC_SETFLAGS:
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if (get_user(flags, (int __user *) arg))
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return -EFAULT;
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return ocfs2_set_inode_attr(inode, flags,
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OCFS2_FL_MODIFIABLE);
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default:
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return -ENOTTY;
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}
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}
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#ifdef CONFIG_COMPAT
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long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
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{
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struct inode *inode = file->f_path.dentry->d_inode;
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int ret;
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switch (cmd) {
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case OCFS2_IOC32_GETFLAGS:
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cmd = OCFS2_IOC_GETFLAGS;
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break;
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case OCFS2_IOC32_SETFLAGS:
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cmd = OCFS2_IOC_SETFLAGS;
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break;
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default:
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return -ENOIOCTLCMD;
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}
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lock_kernel();
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ret = ocfs2_ioctl(inode, file, cmd, arg);
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unlock_kernel();
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return ret;
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}
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#endif
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