linux-ext4 - [RFC][PATCH 0/6] delayed allocation ENOSPC handling

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Message-Id: <1212363317.4368.63.camel@localhost.localdomain>
Date:	Sun, 01 Jun 2008 16:35:17 -0700
From:	Mingming Cao <cmm@...ibm.com>
To:	linux-ext4@...r.kernel.org
Subject: [RFC][PATCH 0/6] delayed allocation ENOSPC handling

The following series patches does block reservation for delayed
allocation, to avoid ENOSPC later at page flush time.

Blocks(data and metadata) are reserved at da_write_begin()
time, the freeblocks counter is updated by then, and the number of
reserved blocks is store in per inode counter.

At the writepage time, the unused reserved meta blocks are returned
back. At unlink/truncate time, reserved blocks are properly released.

Signed-off-by: Mingming cao <cmm@...ibm.com>

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