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Commit bab08ab9 authored by Theodore Ts'o's avatar Theodore Ts'o
Browse files

ext4: enforce bigalloc restrictions (e.g., no online resizing, etc.) 



At least initially if the bigalloc feature is enabled, we will not
support non-extent mapped inodes, online resizing, online defrag, or
the FITRIM ioctl.  This simplifies the initial implementation.

Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent 281b5995

fs/ext4/indirect.c

+7 −0
Original line number Diff line number Diff line
@@ -699,6 +699,13 @@ int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 
	/*

	 * Okay, we need to do block allocation.

	*/

	if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,

				       EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {

		EXT4_ERROR_INODE(inode, "Can't allocate blocks for "

				 "non-extent mapped inodes with bigalloc");

		return -ENOSPC;

	}



	goal = ext4_find_goal(inode, map->m_lblk, partial);



	/* the number of blocks need to allocate for [d,t]indirect blocks */

fs/ext4/inode.c

+5 −0
Original line number Diff line number Diff line
@@ -3358,6 +3358,11 @@ int ext4_punch_hole(struct file *file, loff_t offset, loff_t length) 
		return -ENOTSUPP;

	}



	if (EXT4_SB(inode->i_sb)->s_cluster_ratio > 1) {

		/* TODO: Add support for bigalloc file systems */

		return -ENOTSUPP;

	}



	return ext4_ext_punch_hole(file, offset, length);

}

fs/ext4/ioctl.c

+29 −4
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ 
long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)

{

	struct inode *inode = filp->f_dentry->d_inode;

	struct super_block *sb = inode->i_sb;

	struct ext4_inode_info *ei = EXT4_I(inode);

	unsigned int flags;
@@ -183,7 +184,6 @@ setversion_out: 
		 * Returns 1 if it slept, else zero.

		 */

		{

			struct super_block *sb = inode->i_sb;

			DECLARE_WAITQUEUE(wait, current);

			int ret = 0;
@@ -199,7 +199,6 @@ setversion_out: 
#endif

	case EXT4_IOC_GROUP_EXTEND: {

		ext4_fsblk_t n_blocks_count;

		struct super_block *sb = inode->i_sb;

		int err, err2=0;



		err = ext4_resize_begin(sb);
@@ -209,6 +208,13 @@ setversion_out: 
		if (get_user(n_blocks_count, (__u32 __user *)arg))

			return -EFAULT;



		if (EXT4_HAS_RO_COMPAT_FEATURE(sb,

			       EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {

			ext4_msg(sb, KERN_ERR,

				 "Online resizing not supported with bigalloc");

			return -EOPNOTSUPP;

		}



		err = mnt_want_write(filp->f_path.mnt);

		if (err)

			return err;
@@ -250,6 +256,13 @@ setversion_out: 
			goto mext_out;

		}



		if (EXT4_HAS_RO_COMPAT_FEATURE(sb,

			       EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {

			ext4_msg(sb, KERN_ERR,

				 "Online defrag not supported with bigalloc");

			return -EOPNOTSUPP;

		}



		err = mnt_want_write(filp->f_path.mnt);

		if (err)

			goto mext_out;
@@ -270,7 +283,6 @@ mext_out: 


	case EXT4_IOC_GROUP_ADD: {

		struct ext4_new_group_data input;

		struct super_block *sb = inode->i_sb;

		int err, err2=0;



		err = ext4_resize_begin(sb);
@@ -281,6 +293,13 @@ mext_out: 
				sizeof(input)))

			return -EFAULT;



		if (EXT4_HAS_RO_COMPAT_FEATURE(sb,

			       EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {

			ext4_msg(sb, KERN_ERR,

				 "Online resizing not supported with bigalloc");

			return -EOPNOTSUPP;

		}



		err = mnt_want_write(filp->f_path.mnt);

		if (err)

			return err;
@@ -337,7 +356,6 @@ mext_out: 


	case FITRIM:

	{

		struct super_block *sb = inode->i_sb;

		struct request_queue *q = bdev_get_queue(sb->s_bdev);

		struct fstrim_range range;

		int ret = 0;
@@ -348,6 +366,13 @@ mext_out: 
		if (!blk_queue_discard(q))

			return -EOPNOTSUPP;



		if (EXT4_HAS_RO_COMPAT_FEATURE(sb,

			       EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {

			ext4_msg(sb, KERN_ERR,

				 "FITRIM not supported with bigalloc");

			return -EOPNOTSUPP;

		}



		if (copy_from_user(&range, (struct fstrim_range *)arg,

		    sizeof(range)))

			return -EFAULT;

fs/ext4/super.c

+7 −0
Original line number Diff line number Diff line
@@ -2701,6 +2701,13 @@ static int ext4_feature_set_ok(struct super_block *sb, int readonly) 
			return 0;

		}

	}

	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&

	    !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {

		ext4_msg(sb, KERN_ERR,

			 "Can't support bigalloc feature without "

			 "extents feature\n");

		return 0;

	}

	return 1;

}