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[PATCH v3 3/7] xfs: cap prealloc size to free space before shift

To: xfs@xxxxxxxxxxx
Subject: [PATCH v3 3/7] xfs: cap prealloc size to free space before shift
From: Brian Foster <bfoster@xxxxxxxxxx>
Date: Tue, 19 Feb 2013 11:37:27 -0500
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <1361291851-24714-1-git-send-email-bfoster@xxxxxxxxxx>
References: <1361291851-24714-1-git-send-email-bfoster@xxxxxxxxxx>
With the addition of quota preallocation throttling, we want to
support a general algorithm that considers the maximum allowable
prealloc size and recommended shift modifier from various sources
(i.e., global fs state and all applicable quotas for an inode).

Update the current global free space throttle algorithm to cap the
preallocation size to the free space available in the filesystem.

Signed-off-by: Brian Foster <bfoster@xxxxxxxxxx>
---
 fs/xfs/xfs_iomap.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index daa08f6..3b41c18 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -412,6 +412,9 @@ xfs_iomap_prealloc_size(
                if (freesp < mp->m_low_space[XFS_LOWSP_1_PCNT])
                        shift++;
        }
+       if (alloc_blocks > freesp)
+               alloc_blocks = freesp;
+
        if (shift)
                alloc_blocks >>= shift;
        /*
-- 
1.7.7.6

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