Date: Sun, 21 Jun 1998 14:06:04 -0700 (PDT) From: Bruce Evans <bde@FreeBSD.ORG> To: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG, cvs-sys@FreeBSD.ORG Subject: cvs commit: src/sys/gnu/ext2fs ext2_linux_ialloc.c Message-ID: <199806212106.OAA26914@freefall.freebsd.org>
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bde 1998/06/21 14:06:04 PDT
Modified files:
sys/gnu/ext2fs ext2_linux_ialloc.c
Log:
Fixed (?) races in mark_buffer_dirty(). We abuse the buffer cache
by hacking on locked buffers without getblk()ing them, and we didn't
even use splbio() to prevent biodone() changing the buffer underneath
use when a write completes. I think there was no problem in practice
on i386's because the operations on b_flags and numdirtybufs happen to
be atomic. We still depend on biodone()'s operations on b_flags not
interfering with ours. I think there is only interference for B_ERROR,
and this is harmless because errors for async writes are ignored anyway.
Don't use mark_buffer_dirty() except for superblock-related metadata.
It was used in just one case where ordinary BSD buffering is more
natural.
Revision Changes Path
1.10 +6 -3 src/sys/gnu/ext2fs/ext2_linux_ialloc.c
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