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erofs: clean up collection handling routines 

- change return value to int since collection is
   already returned within the collector.
 - better function naming.

Link: https://lore.kernel.org/r/20191008125616.183715-1-gaoxiang25@huawei.com
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
This commit is contained in:
Gao Xiang 2019-10-08 20:56:12 +08:00
parent 4f5cafb5cb
commit 9e579fc123
1 changed files with 25 additions and 22 deletions
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47
fs/erofs/zdata.c
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@ -337,9 +337,9 @@ try_to_claim_pcluster(struct z_erofs_pcluster *pcl,
return COLLECT_PRIMARY; /* :( better luck next time */
}
static struct z_erofs_collection *cllookup(struct z_erofs_collector *clt,
struct inode *inode,
struct erofs_map_blocks *map)
static int z_erofs_lookup_collection(struct z_erofs_collector *clt,
struct inode *inode,
struct erofs_map_blocks *map)
{
struct erofs_workgroup *grp;
struct z_erofs_pcluster *pcl;
@ -349,20 +349,20 @@ static struct z_erofs_collection *cllookup(struct z_erofs_collector *clt,
grp = erofs_find_workgroup(inode->i_sb, map->m_pa >> PAGE_SHIFT, &tag);
if (!grp)
return NULL;
return -ENOENT;
pcl = container_of(grp, struct z_erofs_pcluster, obj);
if (clt->owned_head == &pcl->next || pcl == clt->tailpcl) {
DBG_BUGON(1);
erofs_workgroup_put(grp);
return ERR_PTR(-EFSCORRUPTED);
return -EFSCORRUPTED;
}
cl = z_erofs_primarycollection(pcl);
if (cl->pageofs != (map->m_la & ~PAGE_MASK)) {
DBG_BUGON(1);
erofs_workgroup_put(grp);
return ERR_PTR(-EFSCORRUPTED);
return -EFSCORRUPTED;
}
length = READ_ONCE(pcl->length);
@ -370,7 +370,7 @@ static struct z_erofs_collection *cllookup(struct z_erofs_collector *clt,
if ((map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT) > length) {
DBG_BUGON(1);
erofs_workgroup_put(grp);
return ERR_PTR(-EFSCORRUPTED);
return -EFSCORRUPTED;
}
} else {
unsigned int llen = map->m_llen << Z_EROFS_PCLUSTER_LENGTH_BIT;
@ -394,12 +394,12 @@ static struct z_erofs_collection *cllookup(struct z_erofs_collector *clt,
clt->tailpcl = NULL;
clt->pcl = pcl;
clt->cl = cl;
return cl;
return 0;
}
static struct z_erofs_collection *clregister(struct z_erofs_collector *clt,
struct inode *inode,
struct erofs_map_blocks *map)
static int z_erofs_register_collection(struct z_erofs_collector *clt,
struct inode *inode,
struct erofs_map_blocks *map)
{
struct z_erofs_pcluster *pcl;
struct z_erofs_collection *cl;
@ -408,7 +408,7 @@ static struct z_erofs_collection *clregister(struct z_erofs_collector *clt,
/* no available workgroup, let's allocate one */
pcl = kmem_cache_alloc(pcluster_cachep, GFP_NOFS);
if (!pcl)
return ERR_PTR(-ENOMEM);
return -ENOMEM;
z_erofs_pcluster_init_always(pcl);
pcl->obj.index = map->m_pa >> PAGE_SHIFT;
@ -442,7 +442,7 @@ static struct z_erofs_collection *clregister(struct z_erofs_collector *clt,
if (err) {
mutex_unlock(&cl->lock);
kmem_cache_free(pcluster_cachep, pcl);
return ERR_PTR(-EAGAIN);
return -EAGAIN;
}
/* used to check tail merging loop due to corrupted images */
if (clt->owned_head == Z_EROFS_PCLUSTER_TAIL)
@ -450,14 +450,14 @@ static struct z_erofs_collection *clregister(struct z_erofs_collector *clt,
clt->owned_head = &pcl->next;
clt->pcl = pcl;
clt->cl = cl;
return cl;
return 0;
}
static int z_erofs_collector_begin(struct z_erofs_collector *clt,
struct inode *inode,
struct erofs_map_blocks *map)
{
struct z_erofs_collection *cl;
int ret;
DBG_BUGON(clt->cl);
@ -471,19 +471,22 @@ static int z_erofs_collector_begin(struct z_erofs_collector *clt,
}
repeat:
cl = cllookup(clt, inode, map);
if (!cl) {
cl = clregister(clt, inode, map);
ret = z_erofs_lookup_collection(clt, inode, map);
if (ret == -ENOENT) {
ret = z_erofs_register_collection(clt, inode, map);
if (cl == ERR_PTR(-EAGAIN))
/* someone registered at the same time, give another try */
if (ret == -EAGAIN) {
cond_resched();
goto repeat;
}
}
if (IS_ERR(cl))
return PTR_ERR(cl);
if (ret)
return ret;
z_erofs_pagevec_ctor_init(&clt->vector, Z_EROFS_NR_INLINE_PAGEVECS,
cl->pagevec, cl->vcnt);
clt->cl->pagevec, clt->cl->vcnt);
clt->compressedpages = clt->pcl->compressed_pages;
if (clt->mode <= COLLECT_PRIMARY) /* cannot do in-place I/O */