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gfs2: Turn gfs2_rbm_incr into gfs2_rbm_add

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Change gfs2_rbm_incr to advance an rbm by a given number of blocks.  Use that
in gfs2_reservation_check_and_update to save a gfs2_rbm_to_block ->
gfs2_rbm_from_block round trip.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This commit is contained in:
Andreas Gruenbacher 2020-10-08 00:48:22 +02:00
parent 19c329f680
commit 0eacdd16ad
1 changed files with 33 additions and 22 deletions
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55
fs/gfs2/rgrp.c
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@ -277,29 +277,38 @@ static int gfs2_rbm_from_block(struct gfs2_rbm *rbm, u64 block)
}
/**
* gfs2_rbm_incr - increment an rbm structure
* gfs2_rbm_add - add a number of blocks to an rbm
* @rbm: The rbm with rgd already set correctly
* @blocks: The number of blocks to add to rpm
*
* This function takes an existing rbm structure and increments it to the next
* viable block offset.
*
* Returns: If incrementing the offset would cause the rbm to go past the
* end of the rgrp, true is returned, otherwise false.
* This function takes an existing rbm structure and adds a number of blocks to
* it.
*
* Returns: True if the new rbm would point past the end of the rgrp.
*/
static bool gfs2_rbm_incr(struct gfs2_rbm *rbm)
static bool gfs2_rbm_add(struct gfs2_rbm *rbm, u32 blocks)
{
if (rbm->offset + 1 < rbm_bi(rbm)->bi_blocks) { /* in the same bitmap */
rbm->offset++;
struct gfs2_rgrpd *rgd = rbm->rgd;
struct gfs2_bitmap *bi = rgd->rd_bits + rbm->bii;
if (rbm->offset + blocks < bi->bi_blocks) {
rbm->offset += blocks;
return false;
}
if (rbm->bii == rbm->rgd->rd_length - 1) /* at the last bitmap */
return true;
blocks -= bi->bi_blocks - rbm->offset;
rbm->offset = 0;
rbm->bii++;
return false;
for(;;) {
bi++;
if (bi == rgd->rd_bits + rgd->rd_length)
return true;
if (blocks < bi->bi_blocks) {
rbm->offset = blocks;
rbm->bii = bi - rgd->rd_bits;
return false;
}
blocks -= bi->bi_blocks;
}
}
/**
@ -323,7 +332,7 @@ static bool gfs2_unaligned_extlen(struct gfs2_rbm *rbm, u32 n_unaligned, u32 *le
(*len)--;
if (*len == 0)
return true;
if (gfs2_rbm_incr(rbm))
if (gfs2_rbm_add(rbm, 1))
return true;
}
@ -1639,7 +1648,6 @@ static int gfs2_reservation_check_and_update(struct gfs2_rbm *rbm,
u64 block = gfs2_rbm_to_block(rbm);
u32 extlen = 1;
u64 nblock;
int ret;
/*
* If we have a minimum extent length, then skip over any extent
@ -1664,12 +1672,15 @@ static int gfs2_reservation_check_and_update(struct gfs2_rbm *rbm,
maxext->len = extlen;
maxext->rbm = *rbm;
}
fail:
nblock = block + extlen;
} else {
u64 len = nblock - block;
if (len >= (u64)1 << 32)
return -E2BIG;
extlen = len;
}
ret = gfs2_rbm_from_block(rbm, nblock);
if (ret < 0)
return ret;
fail:
if (gfs2_rbm_add(rbm, extlen))
return -E2BIG;
return 1;
}
@ -2205,7 +2216,7 @@ static void rgblk_free(struct gfs2_sbd *sdp, struct gfs2_rgrpd *rgd,
bi_prev = bi;
}
gfs2_setbit(&rbm, false, new_state);
gfs2_rbm_incr(&rbm);
gfs2_rbm_add(&rbm, 1);
}
}