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erofs: implement fscache-based data read for non-inline layout

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

Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220425122143.56815-19-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 20:21:40 +08:00 committed by Gao Xiang
parent 5375e7c8b0
commit 1442b02b66
3 changed files with 57 additions and 0 deletions
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51
fs/erofs/fscache.c
View file

@ -83,10 +83,61 @@ static int erofs_fscache_meta_readpage(struct file *data, struct page *page)
return ret;
}
static int erofs_fscache_readpage(struct file *file, struct page *page)
{
struct folio *folio = page_folio(page);
struct inode *inode = folio_mapping(folio)->host;
struct super_block *sb = inode->i_sb;
struct erofs_map_blocks map;
struct erofs_map_dev mdev;
erofs_off_t pos;
loff_t pstart;
int ret;
DBG_BUGON(folio_size(folio) != EROFS_BLKSIZ);
pos = folio_pos(folio);
map.m_la = pos;
ret = erofs_map_blocks(inode, &map, EROFS_GET_BLOCKS_RAW);
if (ret)
goto out_unlock;
if (!(map.m_flags & EROFS_MAP_MAPPED)) {
folio_zero_range(folio, 0, folio_size(folio));
goto out_uptodate;
}
mdev = (struct erofs_map_dev) {
.m_deviceid = map.m_deviceid,
.m_pa = map.m_pa,
};
ret = erofs_map_dev(sb, &mdev);
if (ret)
goto out_unlock;
pstart = mdev.m_pa + (pos - map.m_la);
ret = erofs_fscache_read_folios(mdev.m_fscache->cookie,
folio_mapping(folio), folio_pos(folio),
folio_size(folio), pstart);
out_uptodate:
if (!ret)
folio_mark_uptodate(folio);
out_unlock:
folio_unlock(folio);
return ret;
}
static const struct address_space_operations erofs_fscache_meta_aops = {
.readpage = erofs_fscache_meta_readpage,
};
const struct address_space_operations erofs_fscache_access_aops = {
.readpage = erofs_fscache_readpage,
};
int erofs_fscache_register_cookie(struct super_block *sb,
struct erofs_fscache **fscache,
char *name, bool need_inode)

4
fs/erofs/inode.c
View file

@ -292,6 +292,10 @@ static int erofs_fill_inode(struct inode *inode, int isdir)
goto out_unlock;
}
inode->i_mapping->a_ops = &erofs_raw_access_aops;
#ifdef CONFIG_EROFS_FS_ONDEMAND
if (erofs_is_fscache_mode(inode->i_sb))
inode->i_mapping->a_ops = &erofs_fscache_access_aops;
#endif
out_unlock:
erofs_put_metabuf(&buf);

2
fs/erofs/internal.h
View file

@ -614,6 +614,8 @@ int erofs_fscache_register_cookie(struct super_block *sb,
struct erofs_fscache **fscache,
char *name, bool need_inode);
void erofs_fscache_unregister_cookie(struct erofs_fscache **fscache);
extern const struct address_space_operations erofs_fscache_access_aops;
#else
static inline int erofs_fscache_register_fs(struct super_block *sb)
{