--- /dev/null
+/*
+ * This file is part of UBIFS.
+ *
+ * Copyright (C) 2006-2008 Nokia Corporation.
+ * Copyright (C) 2006, 2007 University of Szeged, Hungary
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Authors: Zoltan Sogor
+ * Artem Bityutskiy (Битюцкий Артём)
+ * Adrian Hunter
+ */
+
+/* This file implements EXT2-compatible extended attribute ioctl() calls */
+
+#include <linux/compat.h>
+#include <linux/mount.h>
+#include "ubifs.h"
+
+/**
+ * ubifs_set_inode_flags - set VFS inode flags.
+ * @inode: VFS inode to set flags for
+ *
+ * This function propagates flags from UBIFS inode object to VFS inode object.
+ */
+void ubifs_set_inode_flags(struct inode *inode)
+{
+ unsigned int flags = ubifs_inode(inode)->flags;
+
+ inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_DIRSYNC);
+ if (flags & UBIFS_SYNC_FL)
+ inode->i_flags |= S_SYNC;
+ if (flags & UBIFS_APPEND_FL)
+ inode->i_flags |= S_APPEND;
+ if (flags & UBIFS_IMMUTABLE_FL)
+ inode->i_flags |= S_IMMUTABLE;
+ if (flags & UBIFS_DIRSYNC_FL)
+ inode->i_flags |= S_DIRSYNC;
+}
+
+/*
+ * ioctl2ubifs - convert ioctl inode flags to UBIFS inode flags.
+ * @ioctl_flags: flags to convert
+ *
+ * This function convert ioctl flags (@FS_COMPR_FL, etc) to UBIFS inode flags
+ * (@UBIFS_COMPR_FL, etc).
+ */
+static int ioctl2ubifs(int ioctl_flags)
+{
+ int ubifs_flags = 0;
+
+ if (ioctl_flags & FS_COMPR_FL)
+ ubifs_flags |= UBIFS_COMPR_FL;
+ if (ioctl_flags & FS_SYNC_FL)
+ ubifs_flags |= UBIFS_SYNC_FL;
+ if (ioctl_flags & FS_APPEND_FL)
+ ubifs_flags |= UBIFS_APPEND_FL;
+ if (ioctl_flags & FS_IMMUTABLE_FL)
+ ubifs_flags |= UBIFS_IMMUTABLE_FL;
+ if (ioctl_flags & FS_DIRSYNC_FL)
+ ubifs_flags |= UBIFS_DIRSYNC_FL;
+
+ return ubifs_flags;
+}
+
+/*
+ * ubifs2ioctl - convert UBIFS inode flags to ioctl inode flags.
+ * @ubifs_flags: flags to convert
+ *
+ * This function convert UBIFS (@UBIFS_COMPR_FL, etc) to ioctl flags
+ * (@FS_COMPR_FL, etc).
+ */
+static int ubifs2ioctl(int ubifs_flags)
+{
+ int ioctl_flags = 0;
+
+ if (ubifs_flags & UBIFS_COMPR_FL)
+ ioctl_flags |= FS_COMPR_FL;
+ if (ubifs_flags & UBIFS_SYNC_FL)
+ ioctl_flags |= FS_SYNC_FL;
+ if (ubifs_flags & UBIFS_APPEND_FL)
+ ioctl_flags |= FS_APPEND_FL;
+ if (ubifs_flags & UBIFS_IMMUTABLE_FL)
+ ioctl_flags |= FS_IMMUTABLE_FL;
+ if (ubifs_flags & UBIFS_DIRSYNC_FL)
+ ioctl_flags |= FS_DIRSYNC_FL;
+
+ return ioctl_flags;
+}
+
+static int setflags(struct inode *inode, int flags)
+{
+ int oldflags, err, release;
+ struct ubifs_inode *ui = ubifs_inode(inode);
+ struct ubifs_info *c = inode->i_sb->s_fs_info;
+ struct ubifs_budget_req req = { .dirtied_ino = 1,
+ .dirtied_ino_d = ui->data_len };
+
+ err = ubifs_budget_space(c, &req);
+ if (err)
+ return err;
+
+ /*
+ * The IMMUTABLE and APPEND_ONLY flags can only be changed by
+ * the relevant capability.
+ */
+ mutex_lock(&ui->ui_mutex);
+ oldflags = ubifs2ioctl(ui->flags);
+ if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
+ if (!capable(CAP_LINUX_IMMUTABLE)) {
+ err = -EPERM;
+ goto out_unlock;
+ }
+ }
+
+ ui->flags = ioctl2ubifs(flags);
+ ubifs_set_inode_flags(inode);
+ inode->i_ctime = ubifs_current_time(inode);
+ release = ui->dirty;
+ mark_inode_dirty_sync(inode);
+ mutex_unlock(&ui->ui_mutex);
+
+ if (release)
+ ubifs_release_budget(c, &req);
+ if (IS_SYNC(inode))
+ err = write_inode_now(inode, 1);
+ return err;
+
+out_unlock:
+ ubifs_err(c, "can't modify inode %lu attributes", inode->i_ino);
+ mutex_unlock(&ui->ui_mutex);
+ ubifs_release_budget(c, &req);
+ return err;
+}
+
+long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ int flags, err;
+ struct inode *inode = file_inode(file);
+
+ switch (cmd) {
+ case FS_IOC_GETFLAGS:
+ flags = ubifs2ioctl(ubifs_inode(inode)->flags);
+
+ dbg_gen("get flags: %#x, i_flags %#x", flags, inode->i_flags);
+ return put_user(flags, (int __user *) arg);
+
+ case FS_IOC_SETFLAGS: {
+ if (IS_RDONLY(inode))
+ return -EROFS;
+
+ if (!inode_owner_or_capable(inode))
+ return -EACCES;
+
+ if (get_user(flags, (int __user *) arg))
+ return -EFAULT;
+
+ if (!S_ISDIR(inode->i_mode))
+ flags &= ~FS_DIRSYNC_FL;
+
+ /*
+ * Make sure the file-system is read-write and make sure it
+ * will not become read-only while we are changing the flags.
+ */
+ err = mnt_want_write_file(file);
+ if (err)
+ return err;
+ dbg_gen("set flags: %#x, i_flags %#x", flags, inode->i_flags);
+ err = setflags(inode, flags);
+ mnt_drop_write_file(file);
+ return err;
+ }
+
+ default:
+ return -ENOTTY;
+ }
+}
+
+#ifdef CONFIG_COMPAT
+long ubifs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ switch (cmd) {
+ case FS_IOC32_GETFLAGS:
+ cmd = FS_IOC_GETFLAGS;
+ break;
+ case FS_IOC32_SETFLAGS:
+ cmd = FS_IOC_SETFLAGS;
+ break;
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return ubifs_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
Code Review / kvmfornfv.git / blobdiff