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erofs: implement fscache-based data read for inline layout

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Implement the data plane of reading data from data blobs over fscache
for inline layout.

For the heading non-inline part, the data plane for non-inline layout is
reused, while only the tail packing part needs special handling.

Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220425122143.56815-20-jefflexu@linux.alibaba.com
Acked-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Jeffle Xu 2022-04-25 20:21:41 +08:00 committed by Gao Xiang
parent 1442b02b66
commit bd735bdaa6
1 changed files with 32 additions and 0 deletions
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32
fs/erofs/fscache.c
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@ -83,6 +83,33 @@ static int erofs_fscache_meta_readpage(struct file *data, struct page *page)
return ret;
}
static int erofs_fscache_readpage_inline(struct folio *folio,
struct erofs_map_blocks *map)
{
struct super_block *sb = folio_mapping(folio)->host->i_sb;
struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
erofs_blk_t blknr;
size_t offset, len;
void *src, *dst;
/* For tail packing layout, the offset may be non-zero. */
offset = erofs_blkoff(map->m_pa);
blknr = erofs_blknr(map->m_pa);
len = map->m_llen;
src = erofs_read_metabuf(&buf, sb, blknr, EROFS_KMAP);
if (IS_ERR(src))
return PTR_ERR(src);
dst = kmap_local_folio(folio, 0);
memcpy(dst, src + offset, len);
memset(dst + len, 0, PAGE_SIZE - len);
kunmap_local(dst);
erofs_put_metabuf(&buf);
return 0;
}
static int erofs_fscache_readpage(struct file *file, struct page *page)
{
struct folio *folio = page_folio(page);
@ -108,6 +135,11 @@ static int erofs_fscache_readpage(struct file *file, struct page *page)
goto out_uptodate;
}
if (map.m_flags & EROFS_MAP_META) {
ret = erofs_fscache_readpage_inline(folio, &map);
goto out_uptodate;
}
mdev = (struct erofs_map_dev) {
.m_deviceid = map.m_deviceid,
.m_pa = map.m_pa,