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Commit 3da40c7b authored by Josef Bacik's avatar Josef Bacik Committed by Theodore Ts'o
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ext4: only call ext4_truncate when size <= isize 



At LSF we decided that if we truncate up from isize we shouldn't trim
fallocated blocks that were fallocated with KEEP_SIZE and are past the
new i_size.  This patch fixes ext4 to do this.

[ Completely reworked patch so that i_disksize would actually get set
  when truncating up.  Also reworked the code for handling truncate so
  that it's easier to handle. -- tytso ]

Signed-off-by: default avatarJosef Bacik <jbacik@fb.com>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
Reviewed-by: default avatarLukas Czerner <lczerner@redhat.com>
parent 04e22412

fs/ext4/inode.c

+18 −20
Original line number Diff line number Diff line
@@ -4681,8 +4681,10 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr) 
		ext4_journal_stop(handle);

	}



	if (attr->ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {

	if (attr->ia_valid & ATTR_SIZE) {

		handle_t *handle;

		loff_t oldsize = inode->i_size;

		int shrink = (attr->ia_size <= inode->i_size);



		if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {

			struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
@@ -4690,24 +4692,26 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr) 
			if (attr->ia_size > sbi->s_bitmap_maxbytes)

				return -EFBIG;

		}

		if (!S_ISREG(inode->i_mode))

			return -EINVAL;



		if (IS_I_VERSION(inode) && attr->ia_size != inode->i_size)

			inode_inc_iversion(inode);



		if (S_ISREG(inode->i_mode) &&

		if (ext4_should_order_data(inode) &&

		    (attr->ia_size < inode->i_size)) {

			if (ext4_should_order_data(inode)) {

			error = ext4_begin_ordered_truncate(inode,

							    attr->ia_size);

			if (error)

				goto err_out;

		}

		if (attr->ia_size != inode->i_size) {

			handle = ext4_journal_start(inode, EXT4_HT_INODE, 3);

			if (IS_ERR(handle)) {

				error = PTR_ERR(handle);

				goto err_out;

			}

			if (ext4_handle_valid(handle)) {

			if (ext4_handle_valid(handle) && shrink) {

				error = ext4_orphan_add(handle, inode);

				orphan = 1;

			}
@@ -4726,15 +4730,13 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr) 
			up_write(&EXT4_I(inode)->i_data_sem);

			ext4_journal_stop(handle);

			if (error) {

				if (orphan)

					ext4_orphan_del(NULL, inode);

				goto err_out;

			}

		} else {

			loff_t oldsize = inode->i_size;



			i_size_write(inode, attr->ia_size);

			pagecache_isize_extended(inode, oldsize, inode->i_size);

		}

		if (!shrink)

			pagecache_isize_extended(inode, oldsize, inode->i_size);



		/*

		 * Blocks are going to be removed from the inode. Wait
@@ -4754,13 +4756,9 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr) 
		 * in data=journal mode to make pages freeable.

		 */

		truncate_pagecache(inode, inode->i_size);

	}

	/*

	 * We want to call ext4_truncate() even if attr->ia_size ==

	 * inode->i_size for cases like truncation of fallocated space

	 */

	if (attr->ia_valid & ATTR_SIZE)

		if (shrink)

			ext4_truncate(inode);

	}



	if (!rc) {

		setattr_copy(inode, attr);