xfs: ensure f_ffree returned by statfs() is non-negative

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Because of delayed updates to sb_icount field in the super block, it
is possible to allocate over maxicount number of inodes.  This
causes the arithmetic to calculate a negative number of free inodes
in user commands like df or stat -f.

Since maxicount is a somewhat arbitrary number, a slight over
allocation is not critical but user commands should be displayed as
0 or greater and never go negative.  To do this the value in the
stats buffer f_ffree is capped to never go negative.

[ Modified to use max_t as per Christoph's comment. ]

Signed-off-by: Stu Brodsky <sbrodsky@sgi.com>
Signed-off-by: Dave Chinner <dchinner@redhat.com>

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Stuart Brodsky 2010-08-24 11:46:05 +10:00 • committed by Dave Chinner

parent efceab1d56

commit 2fe33661fc

1 changed files with 6 additions and 1 deletions

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fs/xfs/linux-2.6/xfs_super.c

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