linux-ext4 - ext4: delayed allocation support and mmap

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Message-ID: <CABxQaWsda6PJGLBgdMTGidV_ZcdZrdajJZXgbkRXij3U3_SZAA@mail.gmail.com>
Date:	Wed, 17 Aug 2011 14:02:09 +0300
From:	Surbhi Palande <ameyasurbhi@...il.com>
To:	linux-ext4@...r.kernel.org
Cc:	Jan Kara <jack@...e.cz>, Ted Tso <tytso@....edu>
Subject: ext4: delayed allocation support and mmap

Hi All,

Current ext4_page_mkwrite() implementation always allocates a block
through  ext4_get_block_write() or ext4_get_block().

Commit: 9ea7df534ed2a18157434a496a12cf073ca00c52 removed the calls to
write_begin() to avoid calling ext4_da_write_begin() as calling it
from here is racy.

So for now, in ext4: delayed allocation is not supported under an mmap call?

Regards,
Surbhi.
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