[Cluster-devel] [gfs2-utils PATCH 1/7] fsck.gfs2: Don't bother to pass bl blockmap pointer
Andrew Price
anprice at redhat.com
Thu Jun 23 12:45:54 UTC 2016
On 22/06/16 20:26, Bob Peterson wrote:
> Since the blockmap pointer, bl, is a global variable of pass1, we
> don't need to pass it around needlessly. Make this more efficient.
Is it measurably more efficient? I'd rather make bl's scope narrower
instead of widening it from a maintainability standpoint, but it could
also let the optimizer make better decisions with more limited scope,
e.g. when inlining.
In general I don't think we need to optimize at this small scale at this
point, especially without profiling to make sure the trade-offs are
worthwhile.
Andy
> Signed-off-by: Bob Peterson <rpeterso at redhat.com>
> ---
> gfs2/fsck/pass1.c | 25 ++++++++++++-------------
> 1 file changed, 12 insertions(+), 13 deletions(-)
>
> diff --git a/gfs2/fsck/pass1.c b/gfs2/fsck/pass1.c
> index 6f04109..112b68e 100644
> --- a/gfs2/fsck/pass1.c
> +++ b/gfs2/fsck/pass1.c
> @@ -90,17 +90,17 @@ static int delete_block(struct gfs2_inode *ip, uint64_t block,
> struct gfs2_buffer_head **bh, const char *btype,
> void *private);
>
> -static int gfs2_blockmap_set(struct gfs2_bmap *bmap, uint64_t bblock, int mark)
> +static int gfs2_blockmap_set(uint64_t bblock, int mark)
> {
> static unsigned char *byte;
> static uint64_t b;
>
> - if (!bmap)
> + if (bl == NULL)
> return 0;
> - if (bblock > bmap->size)
> + if (bblock > bl->size)
> return -1;
>
> - byte = bmap->map + BLOCKMAP_SIZE2(bblock);
> + byte = bl->map + BLOCKMAP_SIZE2(bblock);
> b = BLOCKMAP_BYTE_OFFSET2(bblock);
> *byte &= ~(BLOCKMAP_MASK2 << b);
> *byte |= (mark & BLOCKMAP_MASK2) << b;
> @@ -120,7 +120,7 @@ static int _fsck_blockmap_set(struct gfs2_inode *ip, uint64_t bblock,
> if (error)
> return error;
>
> - return gfs2_blockmap_set(bl, bblock, mark);
> + return gfs2_blockmap_set(bblock, mark);
> }
>
> #define fsck_blockmap_set(ip, b, bt, m) \
> @@ -1336,7 +1336,7 @@ static int alloc_metalist(struct gfs2_inode *ip, uint64_t block,
> "%lld (0x%llx) is now marked as indirect.\n"),
> desc, (unsigned long long)block,
> (unsigned long long)block);
> - gfs2_blockmap_set(bl, block, ip->i_sbd->gfs1 ?
> + gfs2_blockmap_set(block, ip->i_sbd->gfs1 ?
> GFS2_BLKST_DINODE : GFS2_BLKST_USED);
> }
> return meta_is_good;
> @@ -1358,7 +1358,7 @@ static int alloc_data(struct gfs2_inode *ip, uint64_t metablock,
> "%lld (0x%llx) is now marked as data.\n"),
> desc, (unsigned long long)block,
> (unsigned long long)block);
> - gfs2_blockmap_set(bl, block, GFS2_BLKST_USED);
> + gfs2_blockmap_set(block, GFS2_BLKST_USED);
> }
> return 0;
> }
> @@ -1407,8 +1407,7 @@ static int pass1_check_metatree(struct gfs2_inode *ip,
>
> error = check_metatree(ip, pass);
> if (error)
> - gfs2_blockmap_set(bl, ip->i_di.di_num.no_addr,
> - GFS2_BLKST_FREE);
> + gfs2_blockmap_set(ip->i_di.di_num.no_addr, GFS2_BLKST_FREE);
> return error;
> }
>
> @@ -1671,7 +1670,7 @@ static int check_system_inode(struct gfs2_sbd *sdp,
> "%llu (0x%llx)\n"),
> (unsigned long long)iblock,
> (unsigned long long)iblock);
> - gfs2_blockmap_set(bl, iblock, GFS2_BLKST_FREE);
> + gfs2_blockmap_set(iblock, GFS2_BLKST_FREE);
> check_n_fix_bitmap(sdp, (*sysinode)->i_rgd, iblock, 0,
> GFS2_BLKST_FREE);
> inode_put(sysinode);
> @@ -1706,7 +1705,7 @@ static int check_system_inode(struct gfs2_sbd *sdp,
> /* Set the blockmap (but not bitmap) back to
> 'free' so that it gets checked like any
> normal dinode. */
> - gfs2_blockmap_set(bl, iblock, GFS2_BLKST_FREE);
> + gfs2_blockmap_set(iblock, GFS2_BLKST_FREE);
> log_err( _("Removed system inode \"%s\".\n"),
> filename);
> }
> @@ -2044,7 +2043,7 @@ static int pass1_process_rgrp(struct gfs2_sbd *sdp, struct rgrp_tree *rgd)
>
> n = lgfs2_bm_scan(rgd, k, ibuf, GFS2_BLKST_UNLINKED);
> for (i = 0; i < n; i++) {
> - gfs2_blockmap_set(bl, ibuf[i], GFS2_BLKST_UNLINKED);
> + gfs2_blockmap_set(ibuf[i], GFS2_BLKST_UNLINKED);
> if (fsck_abort)
> goto out;
> }
> @@ -2200,7 +2199,7 @@ int pass1(struct gfs2_sbd *sdp)
> log_debug( _("rgrp block %lld (0x%llx) "
> "is now marked as 'rgrp data'\n"),
> rgd->ri.ri_addr + i, rgd->ri.ri_addr + i);
> - if (gfs2_blockmap_set(bl, rgd->ri.ri_addr + i,
> + if (gfs2_blockmap_set(rgd->ri.ri_addr + i,
> GFS2_BLKST_USED)) {
> stack;
> gfs2_special_free(&gfs1_rindex_blks);
>
More information about the Cluster-devel
mailing list