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erofs: clean up zmap.c 

Several trivial cleanups which aren't quite necessary to split:

 - Rename lcluster load functions as well as justify full indexes
   since they are typically used for global deduplication for
   compressed data;

 - Avoid unnecessary lines, comments for simplicity.

No logic changes.

Reviewed-by: Guo Xuenan <guoxuenan@huaweicloud.com>
Reviewed-by: Yue Hu <huyue2@coolpad.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230615064421.103178-1-hsiangkao@linux.alibaba.com
This commit is contained in:
Gao Xiang 2023-06-15 14:44:21 +08:00
parent 1990595547
commit 8241fdd3cd
1 changed files with 29 additions and 40 deletions
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69
fs/erofs/zmap.c
View File

@ -22,8 +22,8 @@ struct z_erofs_maprecorder {
bool partialref;
};
static int legacy_load_cluster_from_disk(struct z_erofs_maprecorder *m,
unsigned long lcn)
static int z_erofs_load_full_lcluster(struct z_erofs_maprecorder *m,
unsigned long lcn)
{
struct inode *const inode = m->inode;
struct erofs_inode *const vi = EROFS_I(inode);
@ -226,8 +226,8 @@ static int unpack_compacted_index(struct z_erofs_maprecorder *m,
return 0;
}
static int compacted_load_cluster_from_disk(struct z_erofs_maprecorder *m,
unsigned long lcn, bool lookahead)
static int z_erofs_load_compact_lcluster(struct z_erofs_maprecorder *m,
unsigned long lcn, bool lookahead)
{
struct inode *const inode = m->inode;
struct erofs_inode *const vi = EROFS_I(inode);
@ -277,23 +277,23 @@ static int compacted_load_cluster_from_disk(struct z_erofs_maprecorder *m,
return unpack_compacted_index(m, amortizedshift, pos, lookahead);
}
static int z_erofs_load_cluster_from_disk(struct z_erofs_maprecorder *m,
unsigned int lcn, bool lookahead)
static int z_erofs_load_lcluster_from_disk(struct z_erofs_maprecorder *m,
unsigned int lcn, bool lookahead)
{
const unsigned int datamode = EROFS_I(m->inode)->datalayout;
if (datamode == EROFS_INODE_COMPRESSED_FULL)
return legacy_load_cluster_from_disk(m, lcn);
if (datamode == EROFS_INODE_COMPRESSED_COMPACT)
return compacted_load_cluster_from_disk(m, lcn, lookahead);
return -EINVAL;
switch (EROFS_I(m->inode)->datalayout) {
case EROFS_INODE_COMPRESSED_FULL:
return z_erofs_load_full_lcluster(m, lcn);
case EROFS_INODE_COMPRESSED_COMPACT:
return z_erofs_load_compact_lcluster(m, lcn, lookahead);
default:
return -EINVAL;
}
}
static int z_erofs_extent_lookback(struct z_erofs_maprecorder *m,
unsigned int lookback_distance)
{
struct super_block *sb = m->inode->i_sb;
struct erofs_inode *const vi = EROFS_I(m->inode);
const unsigned int lclusterbits = vi->z_logical_clusterbits;
@ -301,21 +301,15 @@ static int z_erofs_extent_lookback(struct z_erofs_maprecorder *m,
unsigned long lcn = m->lcn - lookback_distance;
int err;
/* load extent head logical cluster if needed */
err = z_erofs_load_cluster_from_disk(m, lcn, false);
err = z_erofs_load_lcluster_from_disk(m, lcn, false);
if (err)
return err;
switch (m->type) {
case Z_EROFS_LCLUSTER_TYPE_NONHEAD:
if (!m->delta[0]) {
erofs_err(m->inode->i_sb,
"invalid lookback distance 0 @ nid %llu",
vi->nid);
DBG_BUGON(1);
return -EFSCORRUPTED;
}
lookback_distance = m->delta[0];
if (!lookback_distance)
goto err_bogus;
continue;
case Z_EROFS_LCLUSTER_TYPE_PLAIN:
case Z_EROFS_LCLUSTER_TYPE_HEAD1:
@ -324,16 +318,15 @@ static int z_erofs_extent_lookback(struct z_erofs_maprecorder *m,
m->map->m_la = (lcn << lclusterbits) | m->clusterofs;
return 0;
default:
erofs_err(m->inode->i_sb,
"unknown type %u @ lcn %lu of nid %llu",
erofs_err(sb, "unknown type %u @ lcn %lu of nid %llu",
m->type, lcn, vi->nid);
DBG_BUGON(1);
return -EOPNOTSUPP;
}
}
erofs_err(m->inode->i_sb, "bogus lookback distance @ nid %llu",
vi->nid);
err_bogus:
erofs_err(sb, "bogus lookback distance %u @ lcn %lu of nid %llu",
lookback_distance, m->lcn, vi->nid);
DBG_BUGON(1);
return -EFSCORRUPTED;
}
@ -365,7 +358,7 @@ static int z_erofs_get_extent_compressedlen(struct z_erofs_maprecorder *m,
if (m->compressedblks)
goto out;
err = z_erofs_load_cluster_from_disk(m, lcn, false);
err = z_erofs_load_lcluster_from_disk(m, lcn, false);
if (err)
return err;
@ -397,9 +390,8 @@ static int z_erofs_get_extent_compressedlen(struct z_erofs_maprecorder *m,
break;
fallthrough;
default:
erofs_err(m->inode->i_sb,
"cannot found CBLKCNT @ lcn %lu of nid %llu",
lcn, vi->nid);
erofs_err(sb, "cannot found CBLKCNT @ lcn %lu of nid %llu", lcn,
vi->nid);
DBG_BUGON(1);
return -EFSCORRUPTED;
}
@ -407,9 +399,7 @@ static int z_erofs_get_extent_compressedlen(struct z_erofs_maprecorder *m,
map->m_plen = erofs_pos(sb, m->compressedblks);
return 0;
err_bonus_cblkcnt:
erofs_err(m->inode->i_sb,
"bogus CBLKCNT @ lcn %lu of nid %llu",
lcn, vi->nid);
erofs_err(sb, "bogus CBLKCNT @ lcn %lu of nid %llu", lcn, vi->nid);
DBG_BUGON(1);
return -EFSCORRUPTED;
}
@ -430,7 +420,7 @@ static int z_erofs_get_extent_decompressedlen(struct z_erofs_maprecorder *m)
return 0;
}
err = z_erofs_load_cluster_from_disk(m, lcn, true);
err = z_erofs_load_lcluster_from_disk(m, lcn, true);
if (err)
return err;
@ -477,7 +467,7 @@ static int z_erofs_do_map_blocks(struct inode *inode,
initial_lcn = ofs >> lclusterbits;
endoff = ofs & ((1 << lclusterbits) - 1);
err = z_erofs_load_cluster_from_disk(&m, initial_lcn, false);
err = z_erofs_load_lcluster_from_disk(&m, initial_lcn, false);
if (err)
goto unmap_out;
@ -535,8 +525,7 @@ static int z_erofs_do_map_blocks(struct inode *inode,
if (flags & EROFS_GET_BLOCKS_FINDTAIL) {
vi->z_tailextent_headlcn = m.lcn;
/* for non-compact indexes, fragmentoff is 64 bits */
if (fragment &&
vi->datalayout == EROFS_INODE_COMPRESSED_FULL)
if (fragment && vi->datalayout == EROFS_INODE_COMPRESSED_FULL)
vi->z_fragmentoff |= (u64)m.pblk << 32;
}
if (ztailpacking && m.lcn == vi->z_tailextent_headlcn) {