1 files changed, 0 insertions, 463 deletions

diff --git a/drivers/staging/erofs/zmap.c b/drivers/staging/erofs/zmap.c
deleted file mode 100644
index 9c0bd65c46bf..000000000000
--- a/drivers/staging/erofs/zmap.c
+++ /dev/null
@@ -1,463 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * linux/drivers/staging/erofs/zmap.c
- *
- * Copyright (C) 2018-2019 HUAWEI, Inc.
- *             http://www.huawei.com/
- * Created by Gao Xiang <gaoxiang25@huawei.com>
- */
-#include "internal.h"
-#include <asm/unaligned.h>
-#include <trace/events/erofs.h>
-
-int z_erofs_fill_inode(struct inode *inode)
-{
-	struct erofs_vnode *const vi = EROFS_V(inode);
-	struct super_block *const sb = inode->i_sb;
-
-	if (vi->datamode == EROFS_INODE_FLAT_COMPRESSION_LEGACY) {
-		vi->z_advise = 0;
-		vi->z_algorithmtype[0] = 0;
-		vi->z_algorithmtype[1] = 0;
-		vi->z_logical_clusterbits = EROFS_SB(sb)->clusterbits;
-		vi->z_physical_clusterbits[0] = vi->z_logical_clusterbits;
-		vi->z_physical_clusterbits[1] = vi->z_logical_clusterbits;
-		set_bit(EROFS_V_Z_INITED_BIT, &vi->flags);
-	}
-
-	inode->i_mapping->a_ops = &z_erofs_vle_normalaccess_aops;
-	return 0;
-}
-
-static int fill_inode_lazy(struct inode *inode)
-{
-	struct erofs_vnode *const vi = EROFS_V(inode);
-	struct super_block *const sb = inode->i_sb;
-	int err;
-	erofs_off_t pos;
-	struct page *page;
-	void *kaddr;
-	struct z_erofs_map_header *h;
-
-	if (test_bit(EROFS_V_Z_INITED_BIT, &vi->flags))
-		return 0;
-
-	if (wait_on_bit_lock(&vi->flags, EROFS_V_BL_Z_BIT, TASK_KILLABLE))
-		return -ERESTARTSYS;
-
-	err = 0;
-	if (test_bit(EROFS_V_Z_INITED_BIT, &vi->flags))
-		goto out_unlock;
-
-	DBG_BUGON(vi->datamode == EROFS_INODE_FLAT_COMPRESSION_LEGACY);
-
-	pos = ALIGN(iloc(EROFS_SB(sb), vi->nid) + vi->inode_isize +
-		    vi->xattr_isize, 8);
-	page = erofs_get_meta_page(sb, erofs_blknr(pos), false);
-	if (IS_ERR(page)) {
-		err = PTR_ERR(page);
-		goto out_unlock;
-	}
-
-	kaddr = kmap_atomic(page);
-
-	h = kaddr + erofs_blkoff(pos);
-	vi->z_advise = le16_to_cpu(h->h_advise);
-	vi->z_algorithmtype[0] = h->h_algorithmtype & 15;
-	vi->z_algorithmtype[1] = h->h_algorithmtype >> 4;
-
-	if (vi->z_algorithmtype[0] >= Z_EROFS_COMPRESSION_MAX) {
-		errln("unknown compression format %u for nid %llu, please upgrade kernel",
-		      vi->z_algorithmtype[0], vi->nid);
-		err = -ENOTSUPP;
-		goto unmap_done;
-	}
-
-	vi->z_logical_clusterbits = LOG_BLOCK_SIZE + (h->h_clusterbits & 7);
-	vi->z_physical_clusterbits[0] = vi->z_logical_clusterbits +
-					((h->h_clusterbits >> 3) & 3);
-
-	if (vi->z_physical_clusterbits[0] != LOG_BLOCK_SIZE) {
-		errln("unsupported physical clusterbits %u for nid %llu, please upgrade kernel",
-		      vi->z_physical_clusterbits[0], vi->nid);
-		err = -ENOTSUPP;
-		goto unmap_done;
-	}
-
-	vi->z_physical_clusterbits[1] = vi->z_logical_clusterbits +
-					((h->h_clusterbits >> 5) & 7);
-unmap_done:
-	kunmap_atomic(kaddr);
-	unlock_page(page);
-	put_page(page);
-
-	set_bit(EROFS_V_Z_INITED_BIT, &vi->flags);
-out_unlock:
-	clear_and_wake_up_bit(EROFS_V_BL_Z_BIT, &vi->flags);
-	return err;
-}
-
-struct z_erofs_maprecorder {
-	struct inode *inode;
-	struct erofs_map_blocks *map;
-	void *kaddr;
-
-	unsigned long lcn;
-	/* compression extent information gathered */
-	u8  type;
-	u16 clusterofs;
-	u16 delta[2];
-	erofs_blk_t pblk;
-};
-
-static int z_erofs_reload_indexes(struct z_erofs_maprecorder *m,
-				  erofs_blk_t eblk)
-{
-	struct super_block *const sb = m->inode->i_sb;
-	struct erofs_map_blocks *const map = m->map;
-	struct page *mpage = map->mpage;
-
-	if (mpage) {
-		if (mpage->index == eblk) {
-			if (!m->kaddr)
-				m->kaddr = kmap_atomic(mpage);
-			return 0;
-		}
-
-		if (m->kaddr) {
-			kunmap_atomic(m->kaddr);
-			m->kaddr = NULL;
-		}
-		put_page(mpage);
-	}
-
-	mpage = erofs_get_meta_page(sb, eblk, false);
-	if (IS_ERR(mpage)) {
-		map->mpage = NULL;
-		return PTR_ERR(mpage);
-	}
-	m->kaddr = kmap_atomic(mpage);
-	unlock_page(mpage);
-	map->mpage = mpage;
-	return 0;
-}
-
-static int vle_legacy_load_cluster_from_disk(struct z_erofs_maprecorder *m,
-					     unsigned long lcn)
-{
-	struct inode *const inode = m->inode;
-	struct erofs_vnode *const vi = EROFS_V(inode);
-	const erofs_off_t ibase = iloc(EROFS_I_SB(inode), vi->nid);
-	const erofs_off_t pos =
-		Z_EROFS_VLE_LEGACY_INDEX_ALIGN(ibase + vi->inode_isize +
-					       vi->xattr_isize) +
-		lcn * sizeof(struct z_erofs_vle_decompressed_index);
-	struct z_erofs_vle_decompressed_index *di;
-	unsigned int advise, type;
-	int err;
-
-	err = z_erofs_reload_indexes(m, erofs_blknr(pos));
-	if (err)
-		return err;
-
-	m->lcn = lcn;
-	di = m->kaddr + erofs_blkoff(pos);
-
-	advise = le16_to_cpu(di->di_advise);
-	type = (advise >> Z_EROFS_VLE_DI_CLUSTER_TYPE_BIT) &
-		((1 << Z_EROFS_VLE_DI_CLUSTER_TYPE_BITS) - 1);
-	switch (type) {
-	case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
-		m->clusterofs = 1 << vi->z_logical_clusterbits;
-		m->delta[0] = le16_to_cpu(di->di_u.delta[0]);
-		m->delta[1] = le16_to_cpu(di->di_u.delta[1]);
-		break;
-	case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
-	case Z_EROFS_VLE_CLUSTER_TYPE_HEAD:
-		m->clusterofs = le16_to_cpu(di->di_clusterofs);
-		m->pblk = le32_to_cpu(di->di_u.blkaddr);
-		break;
-	default:
-		DBG_BUGON(1);
-		return -EIO;
-	}
-	m->type = type;
-	return 0;
-}
-
-static unsigned int decode_compactedbits(unsigned int lobits,
-					 unsigned int lomask,
-					 u8 *in, unsigned int pos, u8 *type)
-{
-	const unsigned int v = get_unaligned_le32(in + pos / 8) >> (pos & 7);
-	const unsigned int lo = v & lomask;
-
-	*type = (v >> lobits) & 3;
-	return lo;
-}
-
-static int unpack_compacted_index(struct z_erofs_maprecorder *m,
-				  unsigned int amortizedshift,
-				  unsigned int eofs)
-{
-	struct erofs_vnode *const vi = EROFS_V(m->inode);
-	const unsigned int lclusterbits = vi->z_logical_clusterbits;
-	const unsigned int lomask = (1 << lclusterbits) - 1;
-	unsigned int vcnt, base, lo, encodebits, nblk;
-	int i;
-	u8 *in, type;
-
-	if (1 << amortizedshift == 4)
-		vcnt = 2;
-	else if (1 << amortizedshift == 2 && lclusterbits == 12)
-		vcnt = 16;
-	else
-		return -ENOTSUPP;
-
-	encodebits = ((vcnt << amortizedshift) - sizeof(__le32)) * 8 / vcnt;
-	base = round_down(eofs, vcnt << amortizedshift);
-	in = m->kaddr + base;
-
-	i = (eofs - base) >> amortizedshift;
-
-	lo = decode_compactedbits(lclusterbits, lomask,
-				  in, encodebits * i, &type);
-	m->type = type;
-	if (type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD) {
-		m->clusterofs = 1 << lclusterbits;
-		if (i + 1 != vcnt) {
-			m->delta[0] = lo;
-			return 0;
-		}
-		/*
-		 * since the last lcluster in the pack is special,
-		 * of which lo saves delta[1] rather than delta[0].
-		 * Hence, get delta[0] by the previous lcluster indirectly.
-		 */
-		lo = decode_compactedbits(lclusterbits, lomask,
-					  in, encodebits * (i - 1), &type);
-		if (type != Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD)
-			lo = 0;
-		m->delta[0] = lo + 1;
-		return 0;
-	}
-	m->clusterofs = lo;
-	m->delta[0] = 0;
-	/* figout out blkaddr (pblk) for HEAD lclusters */
-	nblk = 1;
-	while (i > 0) {
-		--i;
-		lo = decode_compactedbits(lclusterbits, lomask,
-					  in, encodebits * i, &type);
-		if (type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD)
-			i -= lo;
-
-		if (i >= 0)
-			++nblk;
-	}
-	in += (vcnt << amortizedshift) - sizeof(__le32);
-	m->pblk = le32_to_cpu(*(__le32 *)in) + nblk;
-	return 0;
-}
-
-static int compacted_load_cluster_from_disk(struct z_erofs_maprecorder *m,
-					    unsigned long lcn)
-{
-	struct inode *const inode = m->inode;
-	struct erofs_vnode *const vi = EROFS_V(inode);
-	const unsigned int lclusterbits = vi->z_logical_clusterbits;
-	const erofs_off_t ebase = ALIGN(iloc(EROFS_I_SB(inode), vi->nid) +
-					vi->inode_isize + vi->xattr_isize, 8) +
-		sizeof(struct z_erofs_map_header);
-	const unsigned int totalidx = DIV_ROUND_UP(inode->i_size, EROFS_BLKSIZ);
-	unsigned int compacted_4b_initial, compacted_2b;
-	unsigned int amortizedshift;
-	erofs_off_t pos;
-	int err;
-
-	if (lclusterbits != 12)
-		return -ENOTSUPP;
-
-	if (lcn >= totalidx)
-		return -EINVAL;
-
-	m->lcn = lcn;
-	/* used to align to 32-byte (compacted_2b) alignment */
-	compacted_4b_initial = (32 - ebase % 32) / 4;
-	if (compacted_4b_initial == 32 / 4)
-		compacted_4b_initial = 0;
-
-	if (vi->z_advise & Z_EROFS_ADVISE_COMPACTED_2B)
-		compacted_2b = rounddown(totalidx - compacted_4b_initial, 16);
-	else
-		compacted_2b = 0;
-
-	pos = ebase;
-	if (lcn < compacted_4b_initial) {
-		amortizedshift = 2;
-		goto out;
-	}
-	pos += compacted_4b_initial * 4;
-	lcn -= compacted_4b_initial;
-
-	if (lcn < compacted_2b) {
-		amortizedshift = 1;
-		goto out;
-	}
-	pos += compacted_2b * 2;
-	lcn -= compacted_2b;
-	amortizedshift = 2;
-out:
-	pos += lcn * (1 << amortizedshift);
-	err = z_erofs_reload_indexes(m, erofs_blknr(pos));
-	if (err)
-		return err;
-	return unpack_compacted_index(m, amortizedshift, erofs_blkoff(pos));
-}
-
-static int vle_load_cluster_from_disk(struct z_erofs_maprecorder *m,
-				      unsigned int lcn)
-{
-	const unsigned int datamode = EROFS_V(m->inode)->datamode;
-
-	if (datamode == EROFS_INODE_FLAT_COMPRESSION_LEGACY)
-		return vle_legacy_load_cluster_from_disk(m, lcn);
-
-	if (datamode == EROFS_INODE_FLAT_COMPRESSION)
-		return compacted_load_cluster_from_disk(m, lcn);
-
-	return -EINVAL;
-}
-
-static int vle_extent_lookback(struct z_erofs_maprecorder *m,
-			       unsigned int lookback_distance)
-{
-	struct erofs_vnode *const vi = EROFS_V(m->inode);
-	struct erofs_map_blocks *const map = m->map;
-	const unsigned int lclusterbits = vi->z_logical_clusterbits;
-	unsigned long lcn = m->lcn;
-	int err;
-
-	if (lcn < lookback_distance) {
-		DBG_BUGON(1);
-		return -EIO;
-	}
-
-	/* load extent head logical cluster if needed */
-	lcn -= lookback_distance;
-	err = vle_load_cluster_from_disk(m, lcn);
-	if (err)
-		return err;
-
-	switch (m->type) {
-	case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
-		return vle_extent_lookback(m, m->delta[0]);
-	case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
-		map->m_flags &= ~EROFS_MAP_ZIPPED;
-		/* fallthrough */
-	case Z_EROFS_VLE_CLUSTER_TYPE_HEAD:
-		map->m_la = (lcn << lclusterbits) | m->clusterofs;
-		break;
-	default:
-		errln("unknown type %u at lcn %lu of nid %llu",
-		      m->type, lcn, vi->nid);
-		DBG_BUGON(1);
-		return -EIO;
-	}
-	return 0;
-}
-
-int z_erofs_map_blocks_iter(struct inode *inode,
-			    struct erofs_map_blocks *map,
-			    int flags)
-{
-	struct erofs_vnode *const vi = EROFS_V(inode);
-	struct z_erofs_maprecorder m = {
-		.inode = inode,
-		.map = map,
-	};
-	int err = 0;
-	unsigned int lclusterbits, endoff;
-	unsigned long long ofs, end;
-
-	trace_z_erofs_map_blocks_iter_enter(inode, map, flags);
-
-	/* when trying to read beyond EOF, leave it unmapped */
-	if (unlikely(map->m_la >= inode->i_size)) {
-		map->m_llen = map->m_la + 1 - inode->i_size;
-		map->m_la = inode->i_size;
-		map->m_flags = 0;
-		goto out;
-	}
-
-	err = fill_inode_lazy(inode);
-	if (err)
-		goto out;
-
-	lclusterbits = vi->z_logical_clusterbits;
-	ofs = map->m_la;
-	m.lcn = ofs >> lclusterbits;
-	endoff = ofs & ((1 << lclusterbits) - 1);
-
-	err = vle_load_cluster_from_disk(&m, m.lcn);
-	if (err)
-		goto unmap_out;
-
-	map->m_flags = EROFS_MAP_ZIPPED;	/* by default, compressed */
-	end = (m.lcn + 1ULL) << lclusterbits;
-
-	switch (m.type) {
-	case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
-		if (endoff >= m.clusterofs)
-			map->m_flags &= ~EROFS_MAP_ZIPPED;
-		/* fallthrough */
-	case Z_EROFS_VLE_CLUSTER_TYPE_HEAD:
-		if (endoff >= m.clusterofs) {
-			map->m_la = (m.lcn << lclusterbits) | m.clusterofs;
-			break;
-		}
-		/* m.lcn should be >= 1 if endoff < m.clusterofs */
-		if (unlikely(!m.lcn)) {
-			errln("invalid logical cluster 0 at nid %llu",
-			      vi->nid);
-			err = -EIO;
-			goto unmap_out;
-		}
-		end = (m.lcn << lclusterbits) | m.clusterofs;
-		map->m_flags |= EROFS_MAP_FULL_MAPPED;
-		m.delta[0] = 1;
-		/* fallthrough */
-	case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
-		/* get the correspoinding first chunk */
-		err = vle_extent_lookback(&m, m.delta[0]);
-		if (unlikely(err))
-			goto unmap_out;
-		break;
-	default:
-		errln("unknown type %u at offset %llu of nid %llu",
-		      m.type, ofs, vi->nid);
-		err = -EIO;
-		goto unmap_out;
-	}
-
-	map->m_llen = end - map->m_la;
-	map->m_plen = 1 << lclusterbits;
-	map->m_pa = blknr_to_addr(m.pblk);
-	map->m_flags |= EROFS_MAP_MAPPED;
-
-unmap_out:
-	if (m.kaddr)
-		kunmap_atomic(m.kaddr);
-
-out:
-	debugln("%s, m_la %llu m_pa %llu m_llen %llu m_plen %llu m_flags 0%o",
-		__func__, map->m_la, map->m_pa,
-		map->m_llen, map->m_plen, map->m_flags);
-
-	trace_z_erofs_map_blocks_iter_exit(inode, map, flags, err);
-
-	/* aggressively BUG_ON iff CONFIG_EROFS_FS_DEBUG is on */
-	DBG_BUGON(err < 0 && err != -ENOMEM);
-	return err;
-}
-