svn commit: r187468 - head/sys/ufs/ffs
rdivacky at FreeBSD.org
Tue Jan 20 03:53:05 PST 2009
On Tue, Jan 20, 2009 at 11:30:22AM +0000, Konstantin Belousov wrote:
> Author: kib
> Date: Tue Jan 20 11:30:22 2009
> New Revision: 187468
> URL: http://svn.freebsd.org/changeset/base/187468
> When extending inode size, we call vnode_pager_setsize(), to have a
> address space where to put vnode pages, and then call UFS_BALLOC(),
> to actually allocate new block and map it. When UFS_BALLOC() returns
> error, sometimes we forget to revert the vm object size increase,
> allowing for the pages that are not backed by the logical disk blocks.
> Revert vnode_pager_setsize() back when UFS_BALLOC() failed, for
> ffs_truncate() and ffs_write().
can you describe in what scenario this can trigger? can it be that
many smallish (a few tens of kB?) of mmaped files being read/write
may cause this?
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