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GFS2: new function gfs2_rbm_incr 

Since the previous patch eliminated bi in favor of bii, this follow-on
patch needed to be adjusted accordingly. Here is the revised version.

This patch adds a new function, gfs2_rbm_incr, which increments
an rbm structure. This is more efficient than calling gfs2_rbm_to_block,
incrementing, then calling gfs2_rbm_from_block.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Bob Peterson 2013-09-17 13:14:35 -04:00 committed by Steven Whitehouse
parent e579ed4f44
commit 149ed7f51e
1 changed files with 27 additions and 3 deletions
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30
fs/gfs2/rgrp.c
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@ -273,6 +273,32 @@ static int gfs2_rbm_from_block(struct gfs2_rbm *rbm, u64 block)
return 0;
}
/**
* gfs2_rbm_incr - increment an rbm structure
* @rbm: The rbm with rgd already set correctly
*
* 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.
*
*/
static bool gfs2_rbm_incr(struct gfs2_rbm *rbm)
{
if (rbm->offset + 1 < rbm_bi(rbm)->bi_blocks) { /* in the same bitmap */
rbm->offset++;
return false;
}
if (rbm->bii == rbm->rgd->rd_length - 1) /* at the last bitmap */
return true;
rbm->offset = 0;
rbm->bii++;
return false;
}
/**
* gfs2_unaligned_extlen - Look for free blocks which are not byte aligned
* @rbm: Position to search (value/result)
@ -284,7 +310,6 @@ static int gfs2_rbm_from_block(struct gfs2_rbm *rbm, u64 block)
static bool gfs2_unaligned_extlen(struct gfs2_rbm *rbm, u32 n_unaligned, u32 *len)
{
u64 block;
u32 n;
u8 res;
@ -295,8 +320,7 @@ static bool gfs2_unaligned_extlen(struct gfs2_rbm *rbm, u32 n_unaligned, u32 *le
(*len)--;
if (*len == 0)
return true;
block = gfs2_rbm_to_block(rbm);
if (gfs2_rbm_from_block(rbm, block + 1))
if (gfs2_rbm_incr(rbm))
return true;
}