diff options
| author | dg <dg@FreeBSD.org> | 1995-09-08 17:16:32 +0000 |
|---|---|---|
| committer | dg <dg@FreeBSD.org> | 1995-09-08 17:16:32 +0000 |
| commit | 719bf7a2c276d5297b59ecd2ea45c384474e633b (patch) | |
| tree | 14cacb01d41ae6afc9696140ebb3ed3f6eaca155 /sys/ufs | |
| parent | 9ca2d60714188c494dc65fe39ed38754552f366d (diff) | |
| download | FreeBSD-src-719bf7a2c276d5297b59ecd2ea45c384474e633b.zip FreeBSD-src-719bf7a2c276d5297b59ecd2ea45c384474e633b.tar.gz | |
Slight optimization for the standard case of rotdelay=0.
Diffstat (limited to 'sys/ufs')
| -rw-r--r-- | sys/ufs/ffs/ffs_alloc.c | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/sys/ufs/ffs/ffs_alloc.c b/sys/ufs/ffs/ffs_alloc.c index dc68aae..c8e4f50 100644 --- a/sys/ufs/ffs/ffs_alloc.c +++ b/sys/ufs/ffs/ffs_alloc.c @@ -31,7 +31,7 @@ * SUCH DAMAGE. * * @(#)ffs_alloc.c 8.8 (Berkeley) 2/21/94 - * $Id: ffs_alloc.c,v 1.15 1995/08/07 08:16:32 davidg Exp $ + * $Id: ffs_alloc.c,v 1.16 1995/08/25 19:40:26 bde Exp $ */ #include <sys/param.h> @@ -655,18 +655,18 @@ ffs_blkpref(ip, lbn, indx, bap) * requested rotationally delayed by fs_rotdelay milliseconds. */ nextblk = bap[indx - 1] + fs->fs_frag; - if (indx < fs->fs_maxcontig || bap[indx - fs->fs_maxcontig] + + if (fs->fs_rotdelay == 0 || indx < fs->fs_maxcontig || + bap[indx - fs->fs_maxcontig] + blkstofrags(fs, fs->fs_maxcontig) != nextblk) return (nextblk); - if (fs->fs_rotdelay != 0) - /* - * Here we convert ms of delay to frags as: - * (frags) = (ms) * (rev/sec) * (sect/rev) / - * ((sect/frag) * (ms/sec)) - * then round up to the next block. - */ - nextblk += roundup(fs->fs_rotdelay * fs->fs_rps * fs->fs_nsect / - (NSPF(fs) * 1000), fs->fs_frag); + /* + * Here we convert ms of delay to frags as: + * (frags) = (ms) * (rev/sec) * (sect/rev) / + * ((sect/frag) * (ms/sec)) + * then round up to the next block. + */ + nextblk += roundup(fs->fs_rotdelay * fs->fs_rps * fs->fs_nsect / + (NSPF(fs) * 1000), fs->fs_frag); return (nextblk); } |
