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ab474fccd0
Avoid the unnecessary tail recursion since it can be converted into a loop directly in order to prevent potential stack overflow. It's a pretty straightforward conversion. Link: https://lore.kernel.org/r/20220310182743.102365-1-hsiangkao@linux.alibaba.com Reviewed-by: Yue Hu <huyue2@coolpad.com> Reviewed-by: Chao Yu <chao@kernel.org> Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
773 lines
21 KiB
C
773 lines
21 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2018-2019 HUAWEI, Inc.
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* https://www.huawei.com/
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*/
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#include "internal.h"
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#include <asm/unaligned.h>
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#include <trace/events/erofs.h>
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static int z_erofs_do_map_blocks(struct inode *inode,
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struct erofs_map_blocks *map,
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int flags);
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int z_erofs_fill_inode(struct inode *inode)
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{
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struct erofs_inode *const vi = EROFS_I(inode);
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struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
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if (!erofs_sb_has_big_pcluster(sbi) &&
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!erofs_sb_has_ztailpacking(sbi) &&
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vi->datalayout == EROFS_INODE_FLAT_COMPRESSION_LEGACY) {
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vi->z_advise = 0;
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vi->z_algorithmtype[0] = 0;
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vi->z_algorithmtype[1] = 0;
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vi->z_logical_clusterbits = LOG_BLOCK_SIZE;
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set_bit(EROFS_I_Z_INITED_BIT, &vi->flags);
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}
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inode->i_mapping->a_ops = &z_erofs_aops;
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return 0;
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}
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static int z_erofs_fill_inode_lazy(struct inode *inode)
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{
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struct erofs_inode *const vi = EROFS_I(inode);
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struct super_block *const sb = inode->i_sb;
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int err, headnr;
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erofs_off_t pos;
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struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
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void *kaddr;
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struct z_erofs_map_header *h;
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if (test_bit(EROFS_I_Z_INITED_BIT, &vi->flags)) {
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/*
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* paired with smp_mb() at the end of the function to ensure
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* fields will only be observed after the bit is set.
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*/
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smp_mb();
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return 0;
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}
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if (wait_on_bit_lock(&vi->flags, EROFS_I_BL_Z_BIT, TASK_KILLABLE))
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return -ERESTARTSYS;
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err = 0;
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if (test_bit(EROFS_I_Z_INITED_BIT, &vi->flags))
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goto out_unlock;
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DBG_BUGON(!erofs_sb_has_big_pcluster(EROFS_SB(sb)) &&
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!erofs_sb_has_ztailpacking(EROFS_SB(sb)) &&
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vi->datalayout == EROFS_INODE_FLAT_COMPRESSION_LEGACY);
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pos = ALIGN(iloc(EROFS_SB(sb), vi->nid) + vi->inode_isize +
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vi->xattr_isize, 8);
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kaddr = erofs_read_metabuf(&buf, sb, erofs_blknr(pos),
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EROFS_KMAP_ATOMIC);
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if (IS_ERR(kaddr)) {
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err = PTR_ERR(kaddr);
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goto out_unlock;
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}
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h = kaddr + erofs_blkoff(pos);
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vi->z_advise = le16_to_cpu(h->h_advise);
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vi->z_algorithmtype[0] = h->h_algorithmtype & 15;
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vi->z_algorithmtype[1] = h->h_algorithmtype >> 4;
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headnr = 0;
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if (vi->z_algorithmtype[0] >= Z_EROFS_COMPRESSION_MAX ||
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vi->z_algorithmtype[++headnr] >= Z_EROFS_COMPRESSION_MAX) {
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erofs_err(sb, "unknown HEAD%u format %u for nid %llu, please upgrade kernel",
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headnr + 1, vi->z_algorithmtype[headnr], vi->nid);
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err = -EOPNOTSUPP;
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goto unmap_done;
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}
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vi->z_logical_clusterbits = LOG_BLOCK_SIZE + (h->h_clusterbits & 7);
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if (!erofs_sb_has_big_pcluster(EROFS_SB(sb)) &&
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vi->z_advise & (Z_EROFS_ADVISE_BIG_PCLUSTER_1 |
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Z_EROFS_ADVISE_BIG_PCLUSTER_2)) {
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erofs_err(sb, "per-inode big pcluster without sb feature for nid %llu",
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vi->nid);
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err = -EFSCORRUPTED;
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goto unmap_done;
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}
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if (vi->datalayout == EROFS_INODE_FLAT_COMPRESSION &&
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!(vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_1) ^
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!(vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_2)) {
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erofs_err(sb, "big pcluster head1/2 of compact indexes should be consistent for nid %llu",
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vi->nid);
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err = -EFSCORRUPTED;
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goto unmap_done;
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}
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unmap_done:
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erofs_put_metabuf(&buf);
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if (err)
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goto out_unlock;
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if (vi->z_advise & Z_EROFS_ADVISE_INLINE_PCLUSTER) {
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struct erofs_map_blocks map = {
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.buf = __EROFS_BUF_INITIALIZER
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};
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vi->z_idata_size = le16_to_cpu(h->h_idata_size);
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err = z_erofs_do_map_blocks(inode, &map,
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EROFS_GET_BLOCKS_FINDTAIL);
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erofs_put_metabuf(&map.buf);
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if (!map.m_plen ||
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erofs_blkoff(map.m_pa) + map.m_plen > EROFS_BLKSIZ) {
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erofs_err(sb, "invalid tail-packing pclustersize %llu",
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map.m_plen);
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err = -EFSCORRUPTED;
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}
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if (err < 0)
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goto out_unlock;
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}
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/* paired with smp_mb() at the beginning of the function */
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smp_mb();
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set_bit(EROFS_I_Z_INITED_BIT, &vi->flags);
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out_unlock:
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clear_and_wake_up_bit(EROFS_I_BL_Z_BIT, &vi->flags);
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return err;
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}
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struct z_erofs_maprecorder {
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struct inode *inode;
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struct erofs_map_blocks *map;
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void *kaddr;
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unsigned long lcn;
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/* compression extent information gathered */
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u8 type, headtype;
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u16 clusterofs;
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u16 delta[2];
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erofs_blk_t pblk, compressedlcs;
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erofs_off_t nextpackoff;
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};
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static int z_erofs_reload_indexes(struct z_erofs_maprecorder *m,
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erofs_blk_t eblk)
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{
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struct super_block *const sb = m->inode->i_sb;
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m->kaddr = erofs_read_metabuf(&m->map->buf, sb, eblk,
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EROFS_KMAP_ATOMIC);
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if (IS_ERR(m->kaddr))
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return PTR_ERR(m->kaddr);
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return 0;
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}
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static int legacy_load_cluster_from_disk(struct z_erofs_maprecorder *m,
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unsigned long lcn)
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{
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struct inode *const inode = m->inode;
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struct erofs_inode *const vi = EROFS_I(inode);
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const erofs_off_t ibase = iloc(EROFS_I_SB(inode), vi->nid);
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const erofs_off_t pos =
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Z_EROFS_VLE_LEGACY_INDEX_ALIGN(ibase + vi->inode_isize +
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vi->xattr_isize) +
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lcn * sizeof(struct z_erofs_vle_decompressed_index);
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struct z_erofs_vle_decompressed_index *di;
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unsigned int advise, type;
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int err;
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err = z_erofs_reload_indexes(m, erofs_blknr(pos));
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if (err)
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return err;
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m->nextpackoff = pos + sizeof(struct z_erofs_vle_decompressed_index);
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m->lcn = lcn;
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di = m->kaddr + erofs_blkoff(pos);
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advise = le16_to_cpu(di->di_advise);
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type = (advise >> Z_EROFS_VLE_DI_CLUSTER_TYPE_BIT) &
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((1 << Z_EROFS_VLE_DI_CLUSTER_TYPE_BITS) - 1);
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switch (type) {
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case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
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m->clusterofs = 1 << vi->z_logical_clusterbits;
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m->delta[0] = le16_to_cpu(di->di_u.delta[0]);
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if (m->delta[0] & Z_EROFS_VLE_DI_D0_CBLKCNT) {
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if (!(vi->z_advise & (Z_EROFS_ADVISE_BIG_PCLUSTER_1 |
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Z_EROFS_ADVISE_BIG_PCLUSTER_2))) {
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DBG_BUGON(1);
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return -EFSCORRUPTED;
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}
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m->compressedlcs = m->delta[0] &
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~Z_EROFS_VLE_DI_D0_CBLKCNT;
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m->delta[0] = 1;
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}
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m->delta[1] = le16_to_cpu(di->di_u.delta[1]);
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break;
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case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
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case Z_EROFS_VLE_CLUSTER_TYPE_HEAD1:
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case Z_EROFS_VLE_CLUSTER_TYPE_HEAD2:
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m->clusterofs = le16_to_cpu(di->di_clusterofs);
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m->pblk = le32_to_cpu(di->di_u.blkaddr);
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break;
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default:
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DBG_BUGON(1);
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return -EOPNOTSUPP;
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}
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m->type = type;
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return 0;
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}
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static unsigned int decode_compactedbits(unsigned int lobits,
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unsigned int lomask,
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u8 *in, unsigned int pos, u8 *type)
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{
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const unsigned int v = get_unaligned_le32(in + pos / 8) >> (pos & 7);
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const unsigned int lo = v & lomask;
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*type = (v >> lobits) & 3;
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return lo;
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}
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static int get_compacted_la_distance(unsigned int lclusterbits,
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unsigned int encodebits,
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unsigned int vcnt, u8 *in, int i)
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{
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const unsigned int lomask = (1 << lclusterbits) - 1;
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unsigned int lo, d1 = 0;
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u8 type;
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DBG_BUGON(i >= vcnt);
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do {
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lo = decode_compactedbits(lclusterbits, lomask,
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in, encodebits * i, &type);
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if (type != Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD)
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return d1;
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++d1;
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} while (++i < vcnt);
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/* vcnt - 1 (Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD) item */
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if (!(lo & Z_EROFS_VLE_DI_D0_CBLKCNT))
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d1 += lo - 1;
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return d1;
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}
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static int unpack_compacted_index(struct z_erofs_maprecorder *m,
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unsigned int amortizedshift,
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erofs_off_t pos, bool lookahead)
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{
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struct erofs_inode *const vi = EROFS_I(m->inode);
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const unsigned int lclusterbits = vi->z_logical_clusterbits;
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const unsigned int lomask = (1 << lclusterbits) - 1;
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unsigned int vcnt, base, lo, encodebits, nblk, eofs;
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int i;
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u8 *in, type;
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bool big_pcluster;
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if (1 << amortizedshift == 4)
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vcnt = 2;
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else if (1 << amortizedshift == 2 && lclusterbits == 12)
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vcnt = 16;
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else
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return -EOPNOTSUPP;
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/* it doesn't equal to round_up(..) */
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m->nextpackoff = round_down(pos, vcnt << amortizedshift) +
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(vcnt << amortizedshift);
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big_pcluster = vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_1;
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encodebits = ((vcnt << amortizedshift) - sizeof(__le32)) * 8 / vcnt;
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eofs = erofs_blkoff(pos);
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base = round_down(eofs, vcnt << amortizedshift);
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in = m->kaddr + base;
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i = (eofs - base) >> amortizedshift;
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lo = decode_compactedbits(lclusterbits, lomask,
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in, encodebits * i, &type);
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m->type = type;
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if (type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD) {
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m->clusterofs = 1 << lclusterbits;
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/* figure out lookahead_distance: delta[1] if needed */
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if (lookahead)
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m->delta[1] = get_compacted_la_distance(lclusterbits,
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encodebits, vcnt, in, i);
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if (lo & Z_EROFS_VLE_DI_D0_CBLKCNT) {
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if (!big_pcluster) {
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DBG_BUGON(1);
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return -EFSCORRUPTED;
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}
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m->compressedlcs = lo & ~Z_EROFS_VLE_DI_D0_CBLKCNT;
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m->delta[0] = 1;
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return 0;
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} else if (i + 1 != (int)vcnt) {
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m->delta[0] = lo;
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return 0;
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}
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/*
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* since the last lcluster in the pack is special,
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* of which lo saves delta[1] rather than delta[0].
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* Hence, get delta[0] by the previous lcluster indirectly.
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*/
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lo = decode_compactedbits(lclusterbits, lomask,
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in, encodebits * (i - 1), &type);
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if (type != Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD)
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lo = 0;
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else if (lo & Z_EROFS_VLE_DI_D0_CBLKCNT)
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lo = 1;
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m->delta[0] = lo + 1;
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return 0;
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}
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m->clusterofs = lo;
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m->delta[0] = 0;
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/* figout out blkaddr (pblk) for HEAD lclusters */
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if (!big_pcluster) {
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nblk = 1;
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while (i > 0) {
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--i;
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lo = decode_compactedbits(lclusterbits, lomask,
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in, encodebits * i, &type);
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if (type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD)
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i -= lo;
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if (i >= 0)
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++nblk;
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}
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} else {
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nblk = 0;
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while (i > 0) {
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--i;
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lo = decode_compactedbits(lclusterbits, lomask,
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in, encodebits * i, &type);
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if (type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD) {
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if (lo & Z_EROFS_VLE_DI_D0_CBLKCNT) {
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--i;
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nblk += lo & ~Z_EROFS_VLE_DI_D0_CBLKCNT;
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continue;
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}
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/* bigpcluster shouldn't have plain d0 == 1 */
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if (lo <= 1) {
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DBG_BUGON(1);
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return -EFSCORRUPTED;
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}
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i -= lo - 2;
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continue;
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}
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++nblk;
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}
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}
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in += (vcnt << amortizedshift) - sizeof(__le32);
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m->pblk = le32_to_cpu(*(__le32 *)in) + nblk;
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return 0;
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}
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static int compacted_load_cluster_from_disk(struct z_erofs_maprecorder *m,
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unsigned long lcn, bool lookahead)
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{
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struct inode *const inode = m->inode;
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struct erofs_inode *const vi = EROFS_I(inode);
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const unsigned int lclusterbits = vi->z_logical_clusterbits;
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const erofs_off_t ebase = ALIGN(iloc(EROFS_I_SB(inode), vi->nid) +
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vi->inode_isize + vi->xattr_isize, 8) +
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sizeof(struct z_erofs_map_header);
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const unsigned int totalidx = DIV_ROUND_UP(inode->i_size, EROFS_BLKSIZ);
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unsigned int compacted_4b_initial, compacted_2b;
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unsigned int amortizedshift;
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erofs_off_t pos;
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int err;
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if (lclusterbits != 12)
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return -EOPNOTSUPP;
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if (lcn >= totalidx)
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return -EINVAL;
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m->lcn = lcn;
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/* used to align to 32-byte (compacted_2b) alignment */
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compacted_4b_initial = (32 - ebase % 32) / 4;
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if (compacted_4b_initial == 32 / 4)
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compacted_4b_initial = 0;
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if ((vi->z_advise & Z_EROFS_ADVISE_COMPACTED_2B) &&
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compacted_4b_initial < totalidx)
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compacted_2b = rounddown(totalidx - compacted_4b_initial, 16);
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else
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compacted_2b = 0;
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pos = ebase;
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if (lcn < compacted_4b_initial) {
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amortizedshift = 2;
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goto out;
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}
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pos += compacted_4b_initial * 4;
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lcn -= compacted_4b_initial;
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if (lcn < compacted_2b) {
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amortizedshift = 1;
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goto out;
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}
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pos += compacted_2b * 2;
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lcn -= compacted_2b;
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amortizedshift = 2;
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out:
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pos += lcn * (1 << amortizedshift);
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err = z_erofs_reload_indexes(m, erofs_blknr(pos));
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if (err)
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return err;
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return unpack_compacted_index(m, amortizedshift, pos, lookahead);
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}
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static int z_erofs_load_cluster_from_disk(struct z_erofs_maprecorder *m,
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unsigned int lcn, bool lookahead)
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{
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const unsigned int datamode = EROFS_I(m->inode)->datalayout;
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if (datamode == EROFS_INODE_FLAT_COMPRESSION_LEGACY)
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return legacy_load_cluster_from_disk(m, lcn);
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if (datamode == EROFS_INODE_FLAT_COMPRESSION)
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return compacted_load_cluster_from_disk(m, lcn, lookahead);
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return -EINVAL;
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}
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static int z_erofs_extent_lookback(struct z_erofs_maprecorder *m,
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unsigned int lookback_distance)
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{
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struct erofs_inode *const vi = EROFS_I(m->inode);
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const unsigned int lclusterbits = vi->z_logical_clusterbits;
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while (m->lcn >= lookback_distance) {
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unsigned long lcn = m->lcn - lookback_distance;
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int err;
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/* load extent head logical cluster if needed */
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err = z_erofs_load_cluster_from_disk(m, lcn, false);
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if (err)
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return err;
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switch (m->type) {
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case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
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if (!m->delta[0]) {
|
|
erofs_err(m->inode->i_sb,
|
|
"invalid lookback distance 0 @ nid %llu",
|
|
vi->nid);
|
|
DBG_BUGON(1);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
lookback_distance = m->delta[0];
|
|
continue;
|
|
case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
|
|
case Z_EROFS_VLE_CLUSTER_TYPE_HEAD1:
|
|
case Z_EROFS_VLE_CLUSTER_TYPE_HEAD2:
|
|
m->headtype = m->type;
|
|
m->map->m_la = (lcn << lclusterbits) | m->clusterofs;
|
|
return 0;
|
|
default:
|
|
erofs_err(m->inode->i_sb,
|
|
"unknown type %u @ lcn %lu of nid %llu",
|
|
m->type, lcn, vi->nid);
|
|
DBG_BUGON(1);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
}
|
|
|
|
erofs_err(m->inode->i_sb, "bogus lookback distance @ nid %llu",
|
|
vi->nid);
|
|
DBG_BUGON(1);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
static int z_erofs_get_extent_compressedlen(struct z_erofs_maprecorder *m,
|
|
unsigned int initial_lcn)
|
|
{
|
|
struct erofs_inode *const vi = EROFS_I(m->inode);
|
|
struct erofs_map_blocks *const map = m->map;
|
|
const unsigned int lclusterbits = vi->z_logical_clusterbits;
|
|
unsigned long lcn;
|
|
int err;
|
|
|
|
DBG_BUGON(m->type != Z_EROFS_VLE_CLUSTER_TYPE_PLAIN &&
|
|
m->type != Z_EROFS_VLE_CLUSTER_TYPE_HEAD1 &&
|
|
m->type != Z_EROFS_VLE_CLUSTER_TYPE_HEAD2);
|
|
DBG_BUGON(m->type != m->headtype);
|
|
|
|
if (m->headtype == Z_EROFS_VLE_CLUSTER_TYPE_PLAIN ||
|
|
((m->headtype == Z_EROFS_VLE_CLUSTER_TYPE_HEAD1) &&
|
|
!(vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_1)) ||
|
|
((m->headtype == Z_EROFS_VLE_CLUSTER_TYPE_HEAD2) &&
|
|
!(vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_2))) {
|
|
map->m_plen = 1ULL << lclusterbits;
|
|
return 0;
|
|
}
|
|
lcn = m->lcn + 1;
|
|
if (m->compressedlcs)
|
|
goto out;
|
|
|
|
err = z_erofs_load_cluster_from_disk(m, lcn, false);
|
|
if (err)
|
|
return err;
|
|
|
|
/*
|
|
* If the 1st NONHEAD lcluster has already been handled initially w/o
|
|
* valid compressedlcs, which means at least it mustn't be CBLKCNT, or
|
|
* an internal implemenatation error is detected.
|
|
*
|
|
* The following code can also handle it properly anyway, but let's
|
|
* BUG_ON in the debugging mode only for developers to notice that.
|
|
*/
|
|
DBG_BUGON(lcn == initial_lcn &&
|
|
m->type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD);
|
|
|
|
switch (m->type) {
|
|
case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
|
|
case Z_EROFS_VLE_CLUSTER_TYPE_HEAD1:
|
|
case Z_EROFS_VLE_CLUSTER_TYPE_HEAD2:
|
|
/*
|
|
* if the 1st NONHEAD lcluster is actually PLAIN or HEAD type
|
|
* rather than CBLKCNT, it's a 1 lcluster-sized pcluster.
|
|
*/
|
|
m->compressedlcs = 1;
|
|
break;
|
|
case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
|
|
if (m->delta[0] != 1)
|
|
goto err_bonus_cblkcnt;
|
|
if (m->compressedlcs)
|
|
break;
|
|
fallthrough;
|
|
default:
|
|
erofs_err(m->inode->i_sb,
|
|
"cannot found CBLKCNT @ lcn %lu of nid %llu",
|
|
lcn, vi->nid);
|
|
DBG_BUGON(1);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
out:
|
|
map->m_plen = (u64)m->compressedlcs << lclusterbits;
|
|
return 0;
|
|
err_bonus_cblkcnt:
|
|
erofs_err(m->inode->i_sb,
|
|
"bogus CBLKCNT @ lcn %lu of nid %llu",
|
|
lcn, vi->nid);
|
|
DBG_BUGON(1);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
static int z_erofs_get_extent_decompressedlen(struct z_erofs_maprecorder *m)
|
|
{
|
|
struct inode *inode = m->inode;
|
|
struct erofs_inode *vi = EROFS_I(inode);
|
|
struct erofs_map_blocks *map = m->map;
|
|
unsigned int lclusterbits = vi->z_logical_clusterbits;
|
|
u64 lcn = m->lcn, headlcn = map->m_la >> lclusterbits;
|
|
int err;
|
|
|
|
do {
|
|
/* handle the last EOF pcluster (no next HEAD lcluster) */
|
|
if ((lcn << lclusterbits) >= inode->i_size) {
|
|
map->m_llen = inode->i_size - map->m_la;
|
|
return 0;
|
|
}
|
|
|
|
err = z_erofs_load_cluster_from_disk(m, lcn, true);
|
|
if (err)
|
|
return err;
|
|
|
|
if (m->type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD) {
|
|
DBG_BUGON(!m->delta[1] &&
|
|
m->clusterofs != 1 << lclusterbits);
|
|
} else if (m->type == Z_EROFS_VLE_CLUSTER_TYPE_PLAIN ||
|
|
m->type == Z_EROFS_VLE_CLUSTER_TYPE_HEAD1 ||
|
|
m->type == Z_EROFS_VLE_CLUSTER_TYPE_HEAD2) {
|
|
/* go on until the next HEAD lcluster */
|
|
if (lcn != headlcn)
|
|
break;
|
|
m->delta[1] = 1;
|
|
} else {
|
|
erofs_err(inode->i_sb, "unknown type %u @ lcn %llu of nid %llu",
|
|
m->type, lcn, vi->nid);
|
|
DBG_BUGON(1);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
lcn += m->delta[1];
|
|
} while (m->delta[1]);
|
|
|
|
map->m_llen = (lcn << lclusterbits) + m->clusterofs - map->m_la;
|
|
return 0;
|
|
}
|
|
|
|
static int z_erofs_do_map_blocks(struct inode *inode,
|
|
struct erofs_map_blocks *map,
|
|
int flags)
|
|
{
|
|
struct erofs_inode *const vi = EROFS_I(inode);
|
|
bool ztailpacking = vi->z_advise & Z_EROFS_ADVISE_INLINE_PCLUSTER;
|
|
struct z_erofs_maprecorder m = {
|
|
.inode = inode,
|
|
.map = map,
|
|
};
|
|
int err = 0;
|
|
unsigned int lclusterbits, endoff;
|
|
unsigned long initial_lcn;
|
|
unsigned long long ofs, end;
|
|
|
|
lclusterbits = vi->z_logical_clusterbits;
|
|
ofs = flags & EROFS_GET_BLOCKS_FINDTAIL ? inode->i_size - 1 : map->m_la;
|
|
initial_lcn = ofs >> lclusterbits;
|
|
endoff = ofs & ((1 << lclusterbits) - 1);
|
|
|
|
err = z_erofs_load_cluster_from_disk(&m, initial_lcn, false);
|
|
if (err)
|
|
goto unmap_out;
|
|
|
|
if (ztailpacking && (flags & EROFS_GET_BLOCKS_FINDTAIL))
|
|
vi->z_idataoff = m.nextpackoff;
|
|
|
|
map->m_flags = EROFS_MAP_MAPPED | EROFS_MAP_ENCODED;
|
|
end = (m.lcn + 1ULL) << lclusterbits;
|
|
|
|
switch (m.type) {
|
|
case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
|
|
case Z_EROFS_VLE_CLUSTER_TYPE_HEAD1:
|
|
case Z_EROFS_VLE_CLUSTER_TYPE_HEAD2:
|
|
if (endoff >= m.clusterofs) {
|
|
m.headtype = m.type;
|
|
map->m_la = (m.lcn << lclusterbits) | m.clusterofs;
|
|
/*
|
|
* For ztailpacking files, in order to inline data more
|
|
* effectively, special EOF lclusters are now supported
|
|
* which can have three parts at most.
|
|
*/
|
|
if (ztailpacking && end > inode->i_size)
|
|
end = inode->i_size;
|
|
break;
|
|
}
|
|
/* m.lcn should be >= 1 if endoff < m.clusterofs */
|
|
if (!m.lcn) {
|
|
erofs_err(inode->i_sb,
|
|
"invalid logical cluster 0 at nid %llu",
|
|
vi->nid);
|
|
err = -EFSCORRUPTED;
|
|
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 corresponding first chunk */
|
|
err = z_erofs_extent_lookback(&m, m.delta[0]);
|
|
if (err)
|
|
goto unmap_out;
|
|
break;
|
|
default:
|
|
erofs_err(inode->i_sb,
|
|
"unknown type %u @ offset %llu of nid %llu",
|
|
m.type, ofs, vi->nid);
|
|
err = -EOPNOTSUPP;
|
|
goto unmap_out;
|
|
}
|
|
|
|
map->m_llen = end - map->m_la;
|
|
|
|
if (flags & EROFS_GET_BLOCKS_FINDTAIL)
|
|
vi->z_tailextent_headlcn = m.lcn;
|
|
if (ztailpacking && m.lcn == vi->z_tailextent_headlcn) {
|
|
map->m_flags |= EROFS_MAP_META;
|
|
map->m_pa = vi->z_idataoff;
|
|
map->m_plen = vi->z_idata_size;
|
|
} else {
|
|
map->m_pa = blknr_to_addr(m.pblk);
|
|
err = z_erofs_get_extent_compressedlen(&m, initial_lcn);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
|
|
if (m.headtype == Z_EROFS_VLE_CLUSTER_TYPE_PLAIN)
|
|
map->m_algorithmformat = Z_EROFS_COMPRESSION_SHIFTED;
|
|
else if (m.headtype == Z_EROFS_VLE_CLUSTER_TYPE_HEAD2)
|
|
map->m_algorithmformat = vi->z_algorithmtype[1];
|
|
else
|
|
map->m_algorithmformat = vi->z_algorithmtype[0];
|
|
|
|
if ((flags & EROFS_GET_BLOCKS_FIEMAP) ||
|
|
((flags & EROFS_GET_BLOCKS_READMORE) &&
|
|
map->m_algorithmformat == Z_EROFS_COMPRESSION_LZMA &&
|
|
map->m_llen >= EROFS_BLKSIZ)) {
|
|
err = z_erofs_get_extent_decompressedlen(&m);
|
|
if (!err)
|
|
map->m_flags |= EROFS_MAP_FULL_MAPPED;
|
|
}
|
|
unmap_out:
|
|
erofs_unmap_metabuf(&m.map->buf);
|
|
|
|
out:
|
|
erofs_dbg("%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);
|
|
|
|
return err;
|
|
}
|
|
|
|
int z_erofs_map_blocks_iter(struct inode *inode,
|
|
struct erofs_map_blocks *map,
|
|
int flags)
|
|
{
|
|
int err = 0;
|
|
|
|
trace_z_erofs_map_blocks_iter_enter(inode, map, flags);
|
|
|
|
/* when trying to read beyond EOF, leave it unmapped */
|
|
if (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 = z_erofs_fill_inode_lazy(inode);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = z_erofs_do_map_blocks(inode, map, flags);
|
|
out:
|
|
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;
|
|
}
|
|
|
|
static int z_erofs_iomap_begin_report(struct inode *inode, loff_t offset,
|
|
loff_t length, unsigned int flags,
|
|
struct iomap *iomap, struct iomap *srcmap)
|
|
{
|
|
int ret;
|
|
struct erofs_map_blocks map = { .m_la = offset };
|
|
|
|
ret = z_erofs_map_blocks_iter(inode, &map, EROFS_GET_BLOCKS_FIEMAP);
|
|
erofs_put_metabuf(&map.buf);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
iomap->bdev = inode->i_sb->s_bdev;
|
|
iomap->offset = map.m_la;
|
|
iomap->length = map.m_llen;
|
|
if (map.m_flags & EROFS_MAP_MAPPED) {
|
|
iomap->type = IOMAP_MAPPED;
|
|
iomap->addr = map.m_pa;
|
|
} else {
|
|
iomap->type = IOMAP_HOLE;
|
|
iomap->addr = IOMAP_NULL_ADDR;
|
|
/*
|
|
* No strict rule how to describe extents for post EOF, yet
|
|
* we need do like below. Otherwise, iomap itself will get
|
|
* into an endless loop on post EOF.
|
|
*/
|
|
if (iomap->offset >= inode->i_size)
|
|
iomap->length = length + map.m_la - offset;
|
|
}
|
|
iomap->flags = 0;
|
|
return 0;
|
|
}
|
|
|
|
const struct iomap_ops z_erofs_iomap_report_ops = {
|
|
.iomap_begin = z_erofs_iomap_begin_report,
|
|
};
|