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ocfs2: Some tiny bug fixes for discontiguous block allocation.

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The fixes include:
1. some endian problems.
2. we should use bit/bpc in ocfs2_block_group_grow_discontig to
   allocate clusters.
3. set num_clusters properly in __ocfs2_claim_clusters.
4. change name from ocfs2_supports_discontig_bh to
   ocfs2_supports_discontig_bg.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
This commit is contained in:
Tao Ma 2010-04-22 14:09:15 +08:00
parent 95ec0adf0b
commit 4711954eaa
2 changed files with 25 additions and 15 deletions
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2
fs/ocfs2/ocfs2.h
View File

@ -491,7 +491,7 @@ static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb)
return 0;
}
static inline int ocfs2_supports_discontig_bh(struct ocfs2_super *osb)
static inline int ocfs2_supports_discontig_bg(struct ocfs2_super *osb)
{
if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG)
return 1;

38
fs/ocfs2/suballoc.c
View File

@ -341,15 +341,17 @@ static void ocfs2_bg_discontig_add_extent(struct ocfs2_super *osb,
struct ocfs2_extent_list *el = &bg->bg_list;
struct ocfs2_extent_rec *rec;
BUG_ON(!ocfs2_supports_discontig_bh(osb));
BUG_ON(!ocfs2_supports_discontig_bg(osb));
if (!el->l_next_free_rec)
el->l_count = cpu_to_le16(ocfs2_extent_recs_per_gd(osb->sb));
rec = &el->l_recs[le16_to_cpu(el->l_next_free_rec)];
rec->e_blkno = p_blkno;
rec->e_blkno = cpu_to_le64(p_blkno);
rec->e_cpos = cpu_to_le32(le16_to_cpu(bg->bg_bits) /
le16_to_cpu(cl->cl_bpc));
rec->e_leaf_clusters = cpu_to_le32(clusters);
le16_add_cpu(&bg->bg_bits, clusters * le16_to_cpu(cl->cl_bpc));
le16_add_cpu(&bg->bg_free_bits_count,
clusters * le16_to_cpu(cl->cl_bpc));
le16_add_cpu(&el->l_next_free_rec, 1);
}
@ -397,7 +399,7 @@ static int ocfs2_block_group_fill(handle_t *handle,
if (group_clusters == le16_to_cpu(cl->cl_cpg))
bg->bg_bits = cpu_to_le16(ocfs2_bits_per_group(cl));
else
ocfs2_bg_discontig_add_extent(osb, bg, cl, bg->bg_blkno,
ocfs2_bg_discontig_add_extent(osb, bg, cl, group_blkno,
group_clusters);
/* set the 1st bit in the bitmap to account for the descriptor block */
@ -506,8 +508,8 @@ static int ocfs2_block_group_grow_discontig(handle_t *handle,
struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
struct ocfs2_group_desc *bg =
(struct ocfs2_group_desc *)bg_bh->b_data;
unsigned int needed =
ocfs2_bits_per_group(cl) - le16_to_cpu(bg->bg_bits);
unsigned int needed = le16_to_cpu(cl->cl_cpg) -
le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
u32 p_cpos, clusters;
u64 p_blkno;
struct ocfs2_extent_list *el = &bg->bg_list;
@ -538,10 +540,17 @@ static int ocfs2_block_group_grow_discontig(handle_t *handle,
clusters);
min_bits = clusters;
needed = ocfs2_bits_per_group(cl) - le16_to_cpu(bg->bg_bits);
needed = le16_to_cpu(cl->cl_cpg) -
le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc);
}
if (needed > 0) {
/*
* We have used up all the extent rec but can't fill up
* the cpg. So bail out.
*/
status = -ENOSPC;
goto bail;
}
ocfs2_journal_dirty(handle, bg_bh);
@ -594,7 +603,7 @@ ocfs2_block_group_alloc_discontig(handle_t *handle,
unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
if (!ocfs2_supports_discontig_bh(osb)) {
if (!ocfs2_supports_discontig_bg(osb)) {
status = -ENOSPC;
goto bail;
}
@ -670,7 +679,7 @@ static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
struct ocfs2_chain_list *cl;
struct ocfs2_alloc_context *ac = NULL;
handle_t *handle = NULL;
u64 bg_blkno;
u16 alloc_rec;
struct buffer_head *bg_bh = NULL;
struct ocfs2_group_desc *bg;
@ -726,11 +735,12 @@ static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
goto bail;
}
le32_add_cpu(&cl->cl_recs[bg->bg_chain].c_free,
alloc_rec = le16_to_cpu(bg->bg_chain);
le32_add_cpu(&cl->cl_recs[alloc_rec].c_free,
le16_to_cpu(bg->bg_free_bits_count));
le32_add_cpu(&cl->cl_recs[bg->bg_chain].c_total,
le32_add_cpu(&cl->cl_recs[alloc_rec].c_total,
le16_to_cpu(bg->bg_bits));
cl->cl_recs[bg->bg_chain].c_blkno = cpu_to_le64(bg_blkno);
cl->cl_recs[alloc_rec].c_blkno = cpu_to_le64(bg->bg_blkno);
if (le16_to_cpu(cl->cl_next_free_rec) < le16_to_cpu(cl->cl_count))
le16_add_cpu(&cl->cl_next_free_rec, 1);
@ -1622,7 +1632,7 @@ static void ocfs2_bg_discontig_fix_result(struct ocfs2_alloc_context *ac,
res->sr_blkno = res->sr_bg_blkno + res->sr_bit_offset;
res->sr_bg_blkno = 0; /* Clear it for contig block groups */
if (!ocfs2_supports_discontig_bh(OCFS2_SB(ac->ac_inode->i_sb)) ||
if (!ocfs2_supports_discontig_bg(OCFS2_SB(ac->ac_inode->i_sb)) ||
!bg->bg_list.l_next_free_rec)
return;
@ -2162,6 +2172,7 @@ int __ocfs2_claim_clusters(handle_t *handle,
res.sr_bg_blkno,
res.sr_bit_offset);
atomic_inc(&osb->alloc_stats.bitmap_data);
*num_clusters = res.sr_bits;
}
}
if (status < 0) {
@ -2170,8 +2181,7 @@ int __ocfs2_claim_clusters(handle_t *handle,
goto bail;
}
ac->ac_bits_given += res.sr_bits;
*num_clusters = res.sr_bits;
ac->ac_bits_given += *num_clusters;
bail:
mlog_exit(status);