Commit 6c49ff6f authored by Jan Kara's avatar Jan Kara Committed by Luis Henriques

ext4: fix mmap data corruption when blocksize < pagesize

commit d6320cbf upstream.

Use truncate_isize_extended() when hole is being created in a file so that
->page_mkwrite() will get called for the partial tail page if it is
mmaped (see the first patch in the series for details).
Signed-off-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent c0552c08
...@@ -4654,8 +4654,12 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr) ...@@ -4654,8 +4654,12 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
ext4_orphan_del(NULL, inode); ext4_orphan_del(NULL, inode);
goto err_out; goto err_out;
} }
} else } else {
loff_t oldsize = inode->i_size;
i_size_write(inode, attr->ia_size); i_size_write(inode, attr->ia_size);
pagecache_isize_extended(inode, oldsize, inode->i_size);
}
/* /*
* Blocks are going to be removed from the inode. Wait * Blocks are going to be removed from the inode. Wait
......
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