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ocfs2: Pass suballocation results back via a structure.

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We're going to be adding more info to a suballocator allocation.  Rather
than growing every function in the chain, let's pass a result structure
around.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Tao Ma <tao.ma@oracle.com>
This commit is contained in:
Joel Becker 2010-04-13 14:30:19 +08:00 committed by Tao Ma
parent 798db35f46
commit 7d1fe093bf
2 changed files with 72 additions and 98 deletions
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165
fs/ocfs2/suballoc.c
View File

@ -53,6 +53,12 @@
#define OCFS2_MAX_TO_STEAL 1024
struct ocfs2_suballoc_result {
u64 sr_bg_blkno; /* The bg we allocated from */
unsigned int sr_bit_offset; /* The bit in the bg */
unsigned int sr_bits; /* How many bits we claimed */
};
static inline void ocfs2_debug_bg(struct ocfs2_group_desc *bg);
static inline void ocfs2_debug_suballoc_inode(struct ocfs2_dinode *fe);
static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl);
@ -74,20 +80,18 @@ static int ocfs2_cluster_group_search(struct inode *inode,
struct buffer_head *group_bh,
u32 bits_wanted, u32 min_bits,
u64 max_block,
u16 *bit_off, u16 *bits_found);
struct ocfs2_suballoc_result *res);
static int ocfs2_block_group_search(struct inode *inode,
struct buffer_head *group_bh,
u32 bits_wanted, u32 min_bits,
u64 max_block,
u16 *bit_off, u16 *bits_found);
struct ocfs2_suballoc_result *res);
static int ocfs2_claim_suballoc_bits(struct ocfs2_super *osb,
struct ocfs2_alloc_context *ac,
handle_t *handle,
u32 bits_wanted,
u32 min_bits,
u16 *bit_off,
unsigned int *num_bits,
u64 *bg_blkno);
struct ocfs2_suballoc_result *res);
static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh,
int nr);
static inline int ocfs2_block_group_set_bits(handle_t *handle,
@ -1248,8 +1252,7 @@ static int ocfs2_block_group_find_clear_bits(struct ocfs2_super *osb,
struct buffer_head *bg_bh,
unsigned int bits_wanted,
unsigned int total_bits,
u16 *bit_off,
u16 *bits_found)
struct ocfs2_suballoc_result *res)
{
void *bitmap;
u16 best_offset, best_size;
@ -1293,14 +1296,9 @@ static int ocfs2_block_group_find_clear_bits(struct ocfs2_super *osb,
}
}
/* XXX: I think the first clause is equivalent to the second
* - jlbec */
if (found == bits_wanted) {
*bit_off = start - found;
*bits_found = found;
} else if (best_size) {
*bit_off = best_offset;
*bits_found = best_size;
if (best_size) {
res->sr_bit_offset = best_offset;
res->sr_bits = best_size;
} else {
status = -ENOSPC;
/* No error log here -- see the comment above
@ -1456,14 +1454,13 @@ static int ocfs2_cluster_group_search(struct inode *inode,
struct buffer_head *group_bh,
u32 bits_wanted, u32 min_bits,
u64 max_block,
u16 *bit_off, u16 *bits_found)
struct ocfs2_suballoc_result *res)
{
int search = -ENOSPC;
int ret;
u64 blkoff;
struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *) group_bh->b_data;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
u16 tmp_off, tmp_found;
unsigned int max_bits, gd_cluster_off;
BUG_ON(!ocfs2_is_cluster_bitmap(inode));
@ -1490,15 +1487,15 @@ static int ocfs2_cluster_group_search(struct inode *inode,
ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
group_bh, bits_wanted,
max_bits,
&tmp_off, &tmp_found);
max_bits, res);
if (ret)
return ret;
if (max_block) {
blkoff = ocfs2_clusters_to_blocks(inode->i_sb,
gd_cluster_off +
tmp_off + tmp_found);
res->sr_bit_offset +
res->sr_bits);
mlog(0, "Checking %llu against %llu\n",
(unsigned long long)blkoff,
(unsigned long long)max_block);
@ -1510,16 +1507,14 @@ static int ocfs2_cluster_group_search(struct inode *inode,
* return success, but we still want to return
* -ENOSPC unless it found the minimum number
* of bits. */
if (min_bits <= tmp_found) {
*bit_off = tmp_off;
*bits_found = tmp_found;
if (min_bits <= res->sr_bits)
search = 0; /* success */
} else if (tmp_found) {
else if (res->sr_bits) {
/*
* Don't show bits which we'll be returning
* for allocation to the local alloc bitmap.
*/
ocfs2_local_alloc_seen_free_bits(osb, tmp_found);
ocfs2_local_alloc_seen_free_bits(osb, res->sr_bits);
}
}
@ -1530,7 +1525,7 @@ static int ocfs2_block_group_search(struct inode *inode,
struct buffer_head *group_bh,
u32 bits_wanted, u32 min_bits,
u64 max_block,
u16 *bit_off, u16 *bits_found)
struct ocfs2_suballoc_result *res)
{
int ret = -ENOSPC;
u64 blkoff;
@ -1543,10 +1538,10 @@ static int ocfs2_block_group_search(struct inode *inode,
ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
group_bh, bits_wanted,
le16_to_cpu(bg->bg_bits),
bit_off, bits_found);
res);
if (!ret && max_block) {
blkoff = le64_to_cpu(bg->bg_blkno) + *bit_off +
*bits_found;
blkoff = le64_to_cpu(bg->bg_blkno) +
res->sr_bit_offset + res->sr_bits;
mlog(0, "Checking %llu against %llu\n",
(unsigned long long)blkoff,
(unsigned long long)max_block);
@ -1589,20 +1584,17 @@ static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac,
handle_t *handle,
u32 bits_wanted,
u32 min_bits,
u16 *bit_off,
unsigned int *num_bits,
u64 gd_blkno,
struct ocfs2_suballoc_result *res,
u16 *bits_left)
{
int ret;
u16 found;
struct buffer_head *group_bh = NULL;
struct ocfs2_group_desc *gd;
struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
struct inode *alloc_inode = ac->ac_inode;
ret = ocfs2_read_group_descriptor(alloc_inode, di, gd_blkno,
&group_bh);
ret = ocfs2_read_group_descriptor(alloc_inode, di,
res->sr_bg_blkno, &group_bh);
if (ret < 0) {
mlog_errno(ret);
return ret;
@ -1610,17 +1602,15 @@ static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac,
gd = (struct ocfs2_group_desc *) group_bh->b_data;
ret = ac->ac_group_search(alloc_inode, group_bh, bits_wanted, min_bits,
ac->ac_max_block, bit_off, &found);
ac->ac_max_block, res);
if (ret < 0) {
if (ret != -ENOSPC)
mlog_errno(ret);
goto out;
}
*num_bits = found;
ret = ocfs2_alloc_dinode_update_counts(alloc_inode, handle, ac->ac_bh,
*num_bits,
res->sr_bits,
le16_to_cpu(gd->bg_chain));
if (ret < 0) {
mlog_errno(ret);
@ -1628,7 +1618,7 @@ static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac,
}
ret = ocfs2_block_group_set_bits(handle, alloc_inode, gd, group_bh,
*bit_off, *num_bits);
res->sr_bit_offset, res->sr_bits);
if (ret < 0)
mlog_errno(ret);
@ -1644,13 +1634,11 @@ static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
handle_t *handle,
u32 bits_wanted,
u32 min_bits,
u16 *bit_off,
unsigned int *num_bits,
u64 *bg_blkno,
struct ocfs2_suballoc_result *res,
u16 *bits_left)
{
int status;
u16 chain, tmp_bits;
u16 chain;
u32 tmp_used;
u64 next_group;
struct inode *alloc_inode = ac->ac_inode;
@ -1679,8 +1667,8 @@ static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
* the 1st group with any empty bits. */
while ((status = ac->ac_group_search(alloc_inode, group_bh,
bits_wanted, min_bits,
ac->ac_max_block, bit_off,
&tmp_bits)) == -ENOSPC) {
ac->ac_max_block,
res)) == -ENOSPC) {
if (!bg->bg_next_group)
break;
@ -1705,11 +1693,11 @@ static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
}
mlog(0, "alloc succeeds: we give %u bits from block group %llu\n",
tmp_bits, (unsigned long long)le64_to_cpu(bg->bg_blkno));
res->sr_bits, (unsigned long long)le64_to_cpu(bg->bg_blkno));
*num_bits = tmp_bits;
res->sr_bg_blkno = le64_to_cpu(bg->bg_blkno);
BUG_ON(*num_bits == 0);
BUG_ON(res->sr_bits == 0);
/*
* Keep track of previous block descriptor read. When
@ -1726,7 +1714,7 @@ static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
*/
if (ac->ac_allow_chain_relink &&
(prev_group_bh) &&
(ocfs2_block_group_reasonably_empty(bg, *num_bits))) {
(ocfs2_block_group_reasonably_empty(bg, res->sr_bits))) {
status = ocfs2_relink_block_group(handle, alloc_inode,
ac->ac_bh, group_bh,
prev_group_bh, chain);
@ -1748,25 +1736,24 @@ static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
}
tmp_used = le32_to_cpu(fe->id1.bitmap1.i_used);
fe->id1.bitmap1.i_used = cpu_to_le32(*num_bits + tmp_used);
le32_add_cpu(&cl->cl_recs[chain].c_free, -(*num_bits));
fe->id1.bitmap1.i_used = cpu_to_le32(res->sr_bits + tmp_used);
le32_add_cpu(&cl->cl_recs[chain].c_free, -res->sr_bits);
ocfs2_journal_dirty(handle, ac->ac_bh);
status = ocfs2_block_group_set_bits(handle,
alloc_inode,
bg,
group_bh,
*bit_off,
*num_bits);
res->sr_bit_offset,
res->sr_bits);
if (status < 0) {
mlog_errno(status);
goto bail;
}
mlog(0, "Allocated %u bits from suballocator %llu\n", *num_bits,
mlog(0, "Allocated %u bits from suballocator %llu\n", res->sr_bits,
(unsigned long long)le64_to_cpu(fe->i_blkno));
*bg_blkno = le64_to_cpu(bg->bg_blkno);
*bits_left = le16_to_cpu(bg->bg_free_bits_count);
bail:
brelse(group_bh);
@ -1782,14 +1769,11 @@ static int ocfs2_claim_suballoc_bits(struct ocfs2_super *osb,
handle_t *handle,
u32 bits_wanted,
u32 min_bits,
u16 *bit_off,
unsigned int *num_bits,
u64 *bg_blkno)
struct ocfs2_suballoc_result *res)
{
int status;
u16 victim, i;
u16 bits_left = 0;
u64 hint_blkno = ac->ac_last_group;
struct ocfs2_chain_list *cl;
struct ocfs2_dinode *fe;
@ -1816,22 +1800,16 @@ static int ocfs2_claim_suballoc_bits(struct ocfs2_super *osb,
goto bail;
}
if (hint_blkno) {
res->sr_bg_blkno = ac->ac_last_group;
if (res->sr_bg_blkno) {
/* Attempt to short-circuit the usual search mechanism
* by jumping straight to the most recently used
* allocation group. This helps us mantain some
* contiguousness across allocations. */
status = ocfs2_search_one_group(ac, handle, bits_wanted,
min_bits, bit_off, num_bits,
hint_blkno, &bits_left);
if (!status) {
/* Be careful to update *bg_blkno here as the
* caller is expecting it to be filled in, and
* ocfs2_search_one_group() won't do that for
* us. */
*bg_blkno = hint_blkno;
min_bits, res, &bits_left);
if (!status)
goto set_hint;
}
if (status < 0 && status != -ENOSPC) {
mlog_errno(status);
goto bail;
@ -1844,8 +1822,8 @@ static int ocfs2_claim_suballoc_bits(struct ocfs2_super *osb,
ac->ac_chain = victim;
ac->ac_allow_chain_relink = 1;
status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits, bit_off,
num_bits, bg_blkno, &bits_left);
status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
res, &bits_left);
if (!status)
goto set_hint;
if (status < 0 && status != -ENOSPC) {
@ -1869,8 +1847,7 @@ static int ocfs2_claim_suballoc_bits(struct ocfs2_super *osb,
ac->ac_chain = i;
status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
bit_off, num_bits, bg_blkno,
&bits_left);
res, &bits_left);
if (!status)
break;
if (status < 0 && status != -ENOSPC) {
@ -1887,7 +1864,7 @@ set_hint:
if (bits_left < min_bits)
ac->ac_last_group = 0;
else
ac->ac_last_group = *bg_blkno;
ac->ac_last_group = res->sr_bg_blkno;
}
bail:
@ -1904,7 +1881,7 @@ int ocfs2_claim_metadata(struct ocfs2_super *osb,
u64 *blkno_start)
{
int status;
u64 bg_blkno;
struct ocfs2_suballoc_result res;
BUG_ON(!ac);
BUG_ON(ac->ac_bits_wanted < (ac->ac_bits_given + bits_wanted));
@ -1915,17 +1892,17 @@ int ocfs2_claim_metadata(struct ocfs2_super *osb,
handle,
bits_wanted,
1,
suballoc_bit_start,
num_bits,
&bg_blkno);
&res);
if (status < 0) {
mlog_errno(status);
goto bail;
}
atomic_inc(&osb->alloc_stats.bg_allocs);
*blkno_start = bg_blkno + (u64) *suballoc_bit_start;
ac->ac_bits_given += (*num_bits);
*suballoc_bit_start = res.sr_bit_offset;
*blkno_start = res.sr_bg_blkno + (u64)(res.sr_bit_offset);
ac->ac_bits_given += res.sr_bits;
*num_bits = res.sr_bits;
status = 0;
bail:
mlog_exit(status);
@ -1972,8 +1949,7 @@ int ocfs2_claim_new_inode(struct ocfs2_super *osb,
u64 *fe_blkno)
{
int status;
unsigned int num_bits;
u64 bg_blkno;
struct ocfs2_suballoc_result res;
mlog_entry_void();
@ -1989,18 +1965,17 @@ int ocfs2_claim_new_inode(struct ocfs2_super *osb,
handle,
1,
1,
suballoc_bit,
&num_bits,
&bg_blkno);
&res);
if (status < 0) {
mlog_errno(status);
goto bail;
}
atomic_inc(&osb->alloc_stats.bg_allocs);
BUG_ON(num_bits != 1);
BUG_ON(res.sr_bits != 1);
*fe_blkno = bg_blkno + (u64) (*suballoc_bit);
*suballoc_bit = res.sr_bit_offset;
*fe_blkno = res.sr_bg_blkno + (u64)(res.sr_bit_offset);
ac->ac_bits_given++;
ocfs2_save_inode_ac_group(dir, ac);
status = 0;
@ -2080,8 +2055,7 @@ int __ocfs2_claim_clusters(struct ocfs2_super *osb,
{
int status;
unsigned int bits_wanted = max_clusters;
u64 bg_blkno = 0;
u16 bg_bit_off;
struct ocfs2_suballoc_result res;
mlog_entry_void();
@ -2120,14 +2094,12 @@ int __ocfs2_claim_clusters(struct ocfs2_super *osb,
handle,
bits_wanted,
min_clusters,
&bg_bit_off,
num_clusters,
&bg_blkno);
&res);
if (!status) {
*cluster_start =
ocfs2_desc_bitmap_to_cluster_off(ac->ac_inode,
bg_blkno,
bg_bit_off);
res.sr_bg_blkno,
res.sr_bit_offset);
atomic_inc(&osb->alloc_stats.bitmap_data);
}
}
@ -2137,7 +2109,8 @@ int __ocfs2_claim_clusters(struct ocfs2_super *osb,
goto bail;
}
ac->ac_bits_given += *num_clusters;
ac->ac_bits_given += res.sr_bits;
*num_clusters = res.sr_bits;
bail:
mlog_exit(status);

5
fs/ocfs2/suballoc.h
View File

@ -26,13 +26,14 @@
#ifndef _CHAINALLOC_H_
#define _CHAINALLOC_H_
struct ocfs2_suballoc_result;
typedef int (group_search_t)(struct inode *,
struct buffer_head *,
u32, /* bits_wanted */
u32, /* min_bits */
u64, /* max_block */
u16 *, /* *bit_off */
u16 *); /* *bits_found */
struct ocfs2_suballoc_result *);
/* found bits */
struct ocfs2_alloc_context {
struct inode *ac_inode; /* which bitmap are we allocating from? */