X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=fs%2Fext2%2Fioctl.c;h=de876fa793e1d140386f8bd9693785943f706c09;hb=1d678f365dae28420fa7329a2a35390b3582678d;hp=320b2cb3d4d22eddf610d7a27d043eeef0437d5e;hpb=4fd3670eb1d3c33e8952cf1e79edbb2d517dcfb5;p=linux-2.6-omap-h63xx.git

diff --git a/fs/ext2/ioctl.c b/fs/ext2/ioctl.c
index 320b2cb3d4d..de876fa793e 100644
--- a/fs/ext2/ioctl.c
+++ b/fs/ext2/ioctl.c
@@ -12,17 +12,19 @@
 #include <linux/time.h>
 #include <linux/sched.h>
 #include <linux/compat.h>
+#include <linux/mount.h>
 #include <linux/smp_lock.h>
 #include <asm/current.h>
 #include <asm/uaccess.h>
 
 
-int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
-		unsigned long arg)
+long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
+	struct inode *inode = filp->f_dentry->d_inode;
 	struct ext2_inode_info *ei = EXT2_I(inode);
 	unsigned int flags;
 	unsigned short rsv_window_size;
+	int ret;
 
 	ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
 
@@ -34,14 +36,19 @@ int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
 	case EXT2_IOC_SETFLAGS: {
 		unsigned int oldflags;
 
-		if (IS_RDONLY(inode))
-			return -EROFS;
+		ret = mnt_want_write(filp->f_path.mnt);
+		if (ret)
+			return ret;
 
-		if (!is_owner_or_cap(inode))
-			return -EACCES;
+		if (!is_owner_or_cap(inode)) {
+			ret = -EACCES;
+			goto setflags_out;
+		}
 
-		if (get_user(flags, (int __user *) arg))
-			return -EFAULT;
+		if (get_user(flags, (int __user *) arg)) {
+			ret = -EFAULT;
+			goto setflags_out;
+		}
 
 		if (!S_ISDIR(inode->i_mode))
 			flags &= ~EXT2_DIRSYNC_FL;
@@ -50,7 +57,8 @@ int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
 		/* Is it quota file? Do not allow user to mess with it */
 		if (IS_NOQUOTA(inode)) {
 			mutex_unlock(&inode->i_mutex);
-			return -EPERM;
+			ret = -EPERM;
+			goto setflags_out;
 		}
 		oldflags = ei->i_flags;
 
@@ -63,7 +71,8 @@ int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
 		if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) {
 			if (!capable(CAP_LINUX_IMMUTABLE)) {
 				mutex_unlock(&inode->i_mutex);
-				return -EPERM;
+				ret = -EPERM;
+				goto setflags_out;
 			}
 		}
 
@@ -75,20 +84,26 @@ int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
 		ext2_set_inode_flags(inode);
 		inode->i_ctime = CURRENT_TIME_SEC;
 		mark_inode_dirty(inode);
-		return 0;
+setflags_out:
+		mnt_drop_write(filp->f_path.mnt);
+		return ret;
 	}
 	case EXT2_IOC_GETVERSION:
 		return put_user(inode->i_generation, (int __user *) arg);
 	case EXT2_IOC_SETVERSION:
 		if (!is_owner_or_cap(inode))
 			return -EPERM;
-		if (IS_RDONLY(inode))
-			return -EROFS;
-		if (get_user(inode->i_generation, (int __user *) arg))
-			return -EFAULT;	
-		inode->i_ctime = CURRENT_TIME_SEC;
-		mark_inode_dirty(inode);
-		return 0;
+		ret = mnt_want_write(filp->f_path.mnt);
+		if (ret)
+			return ret;
+		if (get_user(inode->i_generation, (int __user *) arg)) {
+			ret = -EFAULT;
+		} else {
+			inode->i_ctime = CURRENT_TIME_SEC;
+			mark_inode_dirty(inode);
+		}
+		mnt_drop_write(filp->f_path.mnt);
+		return ret;
 	case EXT2_IOC_GETRSVSZ:
 		if (test_opt(inode->i_sb, RESERVATION)
 			&& S_ISREG(inode->i_mode)
@@ -102,15 +117,16 @@ int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
 		if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
 			return -ENOTTY;
 
-		if (IS_RDONLY(inode))
-			return -EROFS;
-
-		if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
+		if (!is_owner_or_cap(inode))
 			return -EACCES;
 
 		if (get_user(rsv_window_size, (int __user *)arg))
 			return -EFAULT;
 
+		ret = mnt_want_write(filp->f_path.mnt);
+		if (ret)
+			return ret;
+
 		if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS)
 			rsv_window_size = EXT2_MAX_RESERVE_BLOCKS;
 
@@ -131,6 +147,7 @@ int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
 			rsv->rsv_goal_size = rsv_window_size;
 		}
 		mutex_unlock(&ei->truncate_mutex);
+		mnt_drop_write(filp->f_path.mnt);
 		return 0;
 	}
 	default:
@@ -141,9 +158,6 @@ int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
 #ifdef CONFIG_COMPAT
 long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
-	struct inode *inode = file->f_path.dentry->d_inode;
-	int ret;
-
 	/* These are just misnamed, they actually get/put from/to user an int */
 	switch (cmd) {
 	case EXT2_IOC32_GETFLAGS:
@@ -161,9 +175,6 @@ long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	default:
 		return -ENOIOCTLCMD;
 	}
-	lock_kernel();
-	ret = ext2_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
-	unlock_kernel();
-	return ret;
+	return ext2_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
 }
 #endif