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ocfs2: Return allocated metadata blknos on the ocfs2_suballoc_result.

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Rather than calculating the resulting block number, return it on the
ocfs2_suballoc_result structure.  This way we can calculate block
numbers for discontiguous block groups.

Cluster groups keep doing it the old way.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
This commit is contained in:
Joel Becker 2010-03-26 10:08:59 +08:00 committed by Tao Ma
parent 1ed9b777f7
commit ba2066351b
1 changed files with 24 additions and 19 deletions
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43
fs/ocfs2/suballoc.c
View file

@ -55,6 +55,7 @@
struct ocfs2_suballoc_result {
u64 sr_bg_blkno; /* The bg we allocated from */
u64 sr_blkno; /* The first allocated block */
unsigned int sr_bit_offset; /* The bit in the bg */
unsigned int sr_bits; /* How many bits we claimed */
};
@ -1579,9 +1580,9 @@ out:
return ret;
}
static int ocfs2_bg_discontig_trim_by_rec(struct ocfs2_suballoc_result *res,
struct ocfs2_extent_rec *rec,
struct ocfs2_chain_list *cl)
static int ocfs2_bg_discontig_fix_by_rec(struct ocfs2_suballoc_result *res,
struct ocfs2_extent_rec *rec,
struct ocfs2_chain_list *cl)
{
unsigned int bpc = le16_to_cpu(cl->cl_bpc);
unsigned int bitoff = le32_to_cpu(rec->e_cpos) * bpc;
@ -1591,32 +1592,35 @@ static int ocfs2_bg_discontig_trim_by_rec(struct ocfs2_suballoc_result *res,
return 0;
if (res->sr_bit_offset >= (bitoff + bitcount))
return 0;
res->sr_blkno = le64_to_cpu(rec->e_blkno) +
(res->sr_bit_offset - bitoff);
if ((res->sr_bit_offset + res->sr_bits) > (bitoff + bitcount))
res->sr_bits = (bitoff + bitcount) - res->sr_bit_offset;
return 1;
}
static void ocfs2_bg_discontig_trim_result(struct ocfs2_alloc_context *ac,
struct ocfs2_group_desc *bg,
struct ocfs2_suballoc_result *res)
static void ocfs2_bg_discontig_fix_result(struct ocfs2_alloc_context *ac,
struct ocfs2_group_desc *bg,
struct ocfs2_suballoc_result *res)
{
int i;
struct ocfs2_extent_rec *rec;
struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
struct ocfs2_chain_list *cl = &di->id2.i_chain;
if (!ocfs2_supports_discontig_bh(OCFS2_SB(ac->ac_inode->i_sb)))
if (ocfs2_is_cluster_bitmap(ac->ac_inode)) {
res->sr_blkno = 0;
return;
}
if (ocfs2_is_cluster_bitmap(ac->ac_inode))
return;
if (!bg->bg_list.l_next_free_rec)
res->sr_blkno = res->sr_bg_blkno + res->sr_bit_offset;
if (!ocfs2_supports_discontig_bh(OCFS2_SB(ac->ac_inode->i_sb)) ||
!bg->bg_list.l_next_free_rec)
return;
for (i = 0; i < le16_to_cpu(bg->bg_list.l_next_free_rec); i++) {
rec = &bg->bg_list.l_recs[i];
if (ocfs2_bg_discontig_trim_by_rec(res, rec, cl))
if (ocfs2_bg_discontig_fix_by_rec(res, rec, cl))
break;
}
}
@ -1651,7 +1655,7 @@ static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac,
}
if (!ret)
ocfs2_bg_discontig_trim_result(ac, gd, res);
ocfs2_bg_discontig_fix_result(ac, gd, res);
ret = ocfs2_alloc_dinode_update_counts(alloc_inode, handle, ac->ac_bh,
res->sr_bits,
@ -1743,7 +1747,7 @@ static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
BUG_ON(res->sr_bits == 0);
if (!status)
ocfs2_bg_discontig_trim_result(ac, bg, res);
ocfs2_bg_discontig_fix_result(ac, bg, res);
/*
@ -1927,7 +1931,7 @@ int ocfs2_claim_metadata(handle_t *handle,
u64 *blkno_start)
{
int status;
struct ocfs2_suballoc_result res;
struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
BUG_ON(!ac);
BUG_ON(ac->ac_bits_wanted < (ac->ac_bits_given + bits_wanted));
@ -1945,7 +1949,7 @@ int ocfs2_claim_metadata(handle_t *handle,
atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs);
*suballoc_bit_start = res.sr_bit_offset;
*blkno_start = res.sr_bg_blkno + (u64)(res.sr_bit_offset);
*blkno_start = res.sr_blkno;
ac->ac_bits_given += res.sr_bits;
*num_bits = res.sr_bits;
status = 0;
@ -1993,7 +1997,7 @@ int ocfs2_claim_new_inode(handle_t *handle,
u64 *fe_blkno)
{
int status;
struct ocfs2_suballoc_result res;
struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
mlog_entry_void();
@ -2018,7 +2022,7 @@ int ocfs2_claim_new_inode(handle_t *handle,
BUG_ON(res.sr_bits != 1);
*suballoc_bit = res.sr_bit_offset;
*fe_blkno = res.sr_bg_blkno + (u64)(res.sr_bit_offset);
*fe_blkno = res.sr_blkno;
ac->ac_bits_given++;
ocfs2_save_inode_ac_group(dir, ac);
status = 0;
@ -2097,7 +2101,7 @@ int __ocfs2_claim_clusters(handle_t *handle,
{
int status;
unsigned int bits_wanted = max_clusters;
struct ocfs2_suballoc_result res;
struct ocfs2_suballoc_result res = { .sr_blkno = 0, };
struct ocfs2_super *osb = OCFS2_SB(ac->ac_inode->i_sb);
mlog_entry_void();
@ -2138,6 +2142,7 @@ int __ocfs2_claim_clusters(handle_t *handle,
min_clusters,
&res);
if (!status) {
BUG_ON(res.sr_blkno); /* cluster alloc can't set */
*cluster_start =
ocfs2_desc_bitmap_to_cluster_off(ac->ac_inode,
res.sr_bg_blkno,