[PATCH 2/2] ext4: Fix mmap data corruption when blocksize < pagesize
From: Jan Kara <jack@suse.cz>
Date: 2014-09-23 15:03:23
Also in:
linux-fsdevel, linux-mm
Subsystem:
ext4 file system, filesystems (vfs and infrastructure), the rest · Maintainers:
"Theodore Ts'o", Alexander Viro, Christian Brauner, Linus Torvalds
Use block_create_hole() 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: Jan Kara <jack@suse.cz> --- fs/ext4/inode.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 3aa26e9117c4..fdcb007c2c9e 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c@@ -4536,8 +4536,12 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr) ext4_orphan_del(NULL, inode); goto err_out; } - } else + } else { + loff_t old_size = inode->i_size; + i_size_write(inode, attr->ia_size); + block_create_hole(inode, old_size, inode->i_size); + } /* * Blocks are going to be removed from the inode. Wait
--
1.8.1.4
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>