I'm running an INN usenet news server that uses raw partitions for
storage. I.e. it opens /dev/sda7 etc. and mmap()s [which finally
works in 2.4, hurray]
Even though the server is keeping those devices open, when a utility
program (sm) opens that file/device and closes() it the close() causes
a fsync() on the device, something that is not wanted.
I applied the following patch which fixes it for me, it prevents
the sync-after-close if it was close() calling blkdev_put()
and we're not the last one to call blkdev_put().
That means fsync() will still be done on unmounts or when the
last user of the device closes it, but not otherwise.
Is this correct or am I overlooking something?
--- linux-2.4.15-pre8/fs/block_dev.c.orig Thu Oct 25 22:58:35 2001
+++ linux-2.4.15-pre8/fs/block_dev.c Wed Nov 21 13:32:16 2001
@@ -603,7 +603,7 @@
down(&bdev->bd_sem);
lock_kernel();
- if (kind == BDEV_FILE)
+ if (kind == BDEV_FILE && bdev->bd_openers == 1)
__block_fsync(bd_inode);
else if (kind == BDEV_FS)
fsync_no_super(rdev);
Mike.
-- "Only two things are infinite, the universe and human stupidity, and I'm not sure about the former" -- Albert Einstein. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Fri Nov 23 2001 - 21:00:30 EST