summaryrefslogtreecommitdiff
path: root/fs/erofs
diff options
context:
space:
mode:
authorJeffle Xu <jefflexu@linux.alibaba.com>2022-04-25 15:21:41 +0300
committerGao Xiang <hsiangkao@linux.alibaba.com>2022-05-17 19:11:20 +0300
commitbd735bdaa62fb64980c07f5443f24aefd0081569 (patch)
tree21fa2cd160f38e7cefcaaf16bf5ed5ff0ddab1db /fs/erofs
parent1442b02b66ad2c568f9d5178b7c3c1287b37e438 (diff)
downloadlinux-bd735bdaa62fb64980c07f5443f24aefd0081569.tar.xz
erofs: implement fscache-based data read for inline layout
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>
Diffstat (limited to 'fs/erofs')
-rw-r--r--fs/erofs/fscache.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
index b3af72af7c88..5b779812a5ee 100644
--- a/fs/erofs/fscache.c
+++ b/fs/erofs/fscache.c
@@ -83,6 +83,33 @@ out:
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,