Date: Wed, 12 Dec 2001 21:07:49 -0800 (PST) From: Kirk McKusick <mckusick@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/ufs/ffs ffs_inode.c Message-ID: <200112130507.fBD57n063530@freefall.freebsd.org>
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mckusick 2001/12/12 21:07:49 PST
Modified files:
sys/ufs/ffs ffs_inode.c
Log:
When a file is partially truncated, we first check to see if the
new file end will land in the middle of a file hole. Since the last
block of a file must always be allocated, the hole is filled by
allocating a block at that location. If the hole being filled is
a direct block, then the truncation may eventually reduce the
full sized block down to a fragment. When running with soft
updates, it is necessary to FSYNC the file after allocating the
block and before creating the fragment to avoid triggering a
soft updates inconsistency when the block unexpectedly shrinks.
Found by: Matthew Dillon <dillon@apollo.backplane.com>
MFC after: 1 week
Revision Changes Path
1.73 +13 -1 src/sys/ufs/ffs/ffs_inode.c
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