patch-2.4.15 linux/fs/ext3/ioctl.c

• Lines: 171
• Date: Fri Nov 9 14:25:04 2001
• Orig file: v2.4.14/linux/fs/ext3/ioctl.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.14/linux/fs/ext3/ioctl.c linux/fs/ext3/ioctl.c
@@ -0,0 +1,170 @@
+/*
+ * linux/fs/ext3/ioctl.c
+ *
+ * Copyright (C) 1993, 1994, 1995
+ * Remy Card (card@masi.ibp.fr)
+ * Laboratoire MASI - Institut Blaise Pascal
+ * Universite Pierre et Marie Curie (Paris VI)
+ */
+
+#include <linux/fs.h>
+#include <linux/jbd.h>
+#include <linux/ext3_fs.h>
+#include <linux/ext3_jbd.h>
+#include <linux/sched.h>
+#include <asm/uaccess.h>
+
+
+int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
+		unsigned long arg)
+{
+	unsigned int flags;
+
+	ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg);
+
+	switch (cmd) {
+	case EXT3_IOC_GETFLAGS:
+		flags = inode->u.ext3_i.i_flags & EXT3_FL_USER_VISIBLE;
+		return put_user(flags, (int *) arg);
+	case EXT3_IOC_SETFLAGS: {
+		handle_t *handle = NULL;
+		int err;
+		struct ext3_iloc iloc;
+		unsigned int oldflags;
+		unsigned int jflag;
+
+		if (IS_RDONLY(inode))
+			return -EROFS;
+
+		if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
+			return -EPERM;
+
+		if (get_user(flags, (int *) arg))
+			return -EFAULT;
+
+		oldflags = inode->u.ext3_i.i_flags;
+
+		/* The JOURNAL_DATA flag is modifiable only by root */
+		jflag = flags & EXT3_JOURNAL_DATA_FL;
+
+		/*
+		 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
+		 * the relevant capability.
+		 *
+		 * This test looks nicer. Thanks to Pauline Middelink
+		 */
+		if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) {
+			if (!capable(CAP_LINUX_IMMUTABLE))
+				return -EPERM;
+		}
+		
+		/*
+		 * The JOURNAL_DATA flag can only be changed by
+		 * the relevant capability.
+		 */
+		if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
+			if (!capable(CAP_SYS_RESOURCE))
+				return -EPERM;
+		}
+
+
+		handle = ext3_journal_start(inode, 1);
+		if (IS_ERR(handle))
+			return PTR_ERR(handle);
+		if (IS_SYNC(inode))
+			handle->h_sync = 1;
+		err = ext3_reserve_inode_write(handle, inode, &iloc);
+		if (err)
+			goto flags_err;
+		
+		flags = flags & EXT3_FL_USER_MODIFIABLE;
+		flags |= oldflags & ~EXT3_FL_USER_MODIFIABLE;
+		inode->u.ext3_i.i_flags = flags;
+
+		if (flags & EXT3_SYNC_FL)
+			inode->i_flags |= S_SYNC;
+		else
+			inode->i_flags &= ~S_SYNC;
+		if (flags & EXT3_APPEND_FL)
+			inode->i_flags |= S_APPEND;
+		else
+			inode->i_flags &= ~S_APPEND;
+		if (flags & EXT3_IMMUTABLE_FL)
+			inode->i_flags |= S_IMMUTABLE;
+		else
+			inode->i_flags &= ~S_IMMUTABLE;
+		if (flags & EXT3_NOATIME_FL)
+			inode->i_flags |= S_NOATIME;
+		else
+			inode->i_flags &= ~S_NOATIME;
+		inode->i_ctime = CURRENT_TIME;
+
+		err = ext3_mark_iloc_dirty(handle, inode, &iloc);
+flags_err:
+		ext3_journal_stop(handle, inode);
+		if (err)
+			return err;
+		
+		if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
+			err = ext3_change_inode_journal_flag(inode, jflag);
+		return err;
+	}
+	case EXT3_IOC_GETVERSION:
+	case EXT3_IOC_GETVERSION_OLD:
+		return put_user(inode->i_generation, (int *) arg);
+	case EXT3_IOC_SETVERSION:
+	case EXT3_IOC_SETVERSION_OLD: {
+		handle_t *handle;
+		struct ext3_iloc iloc;
+		__u32 generation;
+		int err;
+
+		if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
+			return -EPERM;
+		if (IS_RDONLY(inode))
+			return -EROFS;
+		if (get_user(generation, (int *) arg))
+			return -EFAULT;
+
+		handle = ext3_journal_start(inode, 1);
+		if (IS_ERR(handle))
+			return PTR_ERR(handle);
+		err = ext3_reserve_inode_write(handle, inode, &iloc);
+		if (err)
+			return err;
+
+		inode->i_ctime = CURRENT_TIME;
+		inode->i_generation = generation;
+
+		err = ext3_mark_iloc_dirty(handle, inode, &iloc);
+		ext3_journal_stop(handle, inode);
+		return err;
+	}
+#ifdef CONFIG_JBD_DEBUG
+	case EXT3_IOC_WAIT_FOR_READONLY:
+		/*
+		 * This is racy - by the time we're woken up and running,
+		 * the superblock could be released.  And the module could
+		 * have been unloaded.  So sue me.
+		 *
+		 * Returns 1 if it slept, else zero.
+		 */
+		{
+			struct super_block *sb = inode->i_sb;
+			DECLARE_WAITQUEUE(wait, current);
+			int ret = 0;
+
+			set_current_state(TASK_INTERRUPTIBLE);
+			add_wait_queue(&sb->u.ext3_sb.ro_wait_queue, &wait);
+			if (timer_pending(&sb->u.ext3_sb.turn_ro_timer)) {
+				schedule();
+				ret = 1;
+			}
+			remove_wait_queue(&sb->u.ext3_sb.ro_wait_queue, &wait);
+			return ret;
+		}
+#endif
+	default:
+		return -ENOTTY;
+	}
+}