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| author | Jan Kara <jack@suse.cz> | 2014-10-01 21:49:46 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-14 08:59:58 -0800 |
| commit | 78cee20d970646bda1071ae43de5db29267d8e45 (patch) | |
| tree | 83f36f124209eedcb260ee589a096ebdeb458c9b /fs | |
| parent | 95fda6045c22eb6c682b89a15b37d2f2e789caee (diff) | |
| download | lwn-78cee20d970646bda1071ae43de5db29267d8e45.tar.gz lwn-78cee20d970646bda1071ae43de5db29267d8e45.zip | |
ext4: fix mmap data corruption when blocksize < pagesize
commit d6320cbfc92910a3e5f10c42d98c231c98db4f60 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: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ext4/inode.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index b56062dc8b62..6b6e8c5a319d 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4645,8 +4645,12 @@ 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 |