[PATCH 2/2] ext4: Fix mmap data corruption when blocksize < pagesize
Jan Kara <[email protected]>
| Newsgroups | gmane.comp.file-systems.jfs.general,gmane.linux.file-systems,gmane.comp.file-systems.reiserfs.general,gmane.linux.cluster.redhat.cluster.devel,gmane.comp.file-systems.ext4,gmane.comp.file-systems.ocfs2.devel |
|---|---|
| Message-ID | <[email protected]> |
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: Jan Kara <[email protected]> --- 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..9e269489e094 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 oldsize = inode->i_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 -- 1.8.1.4 ------------------------------------------------------------------------------ Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk