Date: Tue, 08 Sep 1998 00:28:19 -0700 From: Mike Smith <mike@smith.net.au> To: zhihuizhang <bf20761@binghamton.edu> Cc: hackers <freebsd-hackers@FreeBSD.ORG> Subject: Re: Simple questions on ffs_blkpref() and cluster_save Message-ID: <199809080728.AAA15515@word.smith.net.au> In-Reply-To: Your message of "Mon, 07 Sep 1998 14:19:25 EDT." <Pine.SOL.L3.93.980907141223.20839A-100000@bingsun2>
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> > Can anyone tell me the meaning of the two parameters indx and bap of the > routine ffs_blkpref() in ffs_alloc.c? > > Trying to figure out the two parameters myself, I look for call instances > of ffs_blkpref(). It is called by ffs_reallocblks(). However, I can not > find where the structure cluster_save is defined. > > My intention is to figure out the meaning of indx/bap by looking at how > ffs_reallocblks() set these two parameters. But I am stuck by the > cluster_save. indx refers to the offset of the allocation within the file section. bap[] is the table of block addresses within the section. It's used to locate the previous block in the file in order to make a contiguous allocation. The comment at the top of ffs_blkpref() is a little opaque, but does seem to clarify this. -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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