mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
4f761fa253
Add prefix "erofs_" to these functions and print sb->s_id as a prefix to erofs_{err, info} so that the user knows which file system is affected. Reported-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Link: https://lore.kernel.org/r/20190904020912.63925-23-gaoxiang25@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
472 lines
12 KiB
C
472 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* 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_inode *const vi = EROFS_I(inode);
|
|
|
|
if (vi->datalayout == EROFS_INODE_FLAT_COMPRESSION_LEGACY) {
|
|
vi->z_advise = 0;
|
|
vi->z_algorithmtype[0] = 0;
|
|
vi->z_algorithmtype[1] = 0;
|
|
vi->z_logical_clusterbits = LOG_BLOCK_SIZE;
|
|
vi->z_physical_clusterbits[0] = vi->z_logical_clusterbits;
|
|
vi->z_physical_clusterbits[1] = vi->z_logical_clusterbits;
|
|
set_bit(EROFS_I_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_inode *const vi = EROFS_I(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_I_Z_INITED_BIT, &vi->flags))
|
|
return 0;
|
|
|
|
if (wait_on_bit_lock(&vi->flags, EROFS_I_BL_Z_BIT, TASK_KILLABLE))
|
|
return -ERESTARTSYS;
|
|
|
|
err = 0;
|
|
if (test_bit(EROFS_I_Z_INITED_BIT, &vi->flags))
|
|
goto out_unlock;
|
|
|
|
DBG_BUGON(vi->datalayout == 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));
|
|
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) {
|
|
erofs_err(sb, "unknown compression format %u for nid %llu, please upgrade kernel",
|
|
vi->z_algorithmtype[0], vi->nid);
|
|
err = -EOPNOTSUPP;
|
|
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) {
|
|
erofs_err(sb, "unsupported physical clusterbits %u for nid %llu, please upgrade kernel",
|
|
vi->z_physical_clusterbits[0], vi->nid);
|
|
err = -EOPNOTSUPP;
|
|
goto unmap_done;
|
|
}
|
|
|
|
vi->z_physical_clusterbits[1] = vi->z_logical_clusterbits +
|
|
((h->h_clusterbits >> 5) & 7);
|
|
set_bit(EROFS_I_Z_INITED_BIT, &vi->flags);
|
|
unmap_done:
|
|
kunmap_atomic(kaddr);
|
|
unlock_page(page);
|
|
put_page(page);
|
|
out_unlock:
|
|
clear_and_wake_up_bit(EROFS_I_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);
|
|
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_inode *const vi = EROFS_I(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 -EOPNOTSUPP;
|
|
}
|
|
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_inode *const vi = EROFS_I(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 -EOPNOTSUPP;
|
|
|
|
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_inode *const vi = EROFS_I(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 -EOPNOTSUPP;
|
|
|
|
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_I(m->inode)->datalayout;
|
|
|
|
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_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 = m->lcn;
|
|
int err;
|
|
|
|
if (lcn < lookback_distance) {
|
|
erofs_err(m->inode->i_sb,
|
|
"bogus lookback distance @ nid %llu", vi->nid);
|
|
DBG_BUGON(1);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
/* 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:
|
|
if (!m->delta[0]) {
|
|
erofs_err(m->inode->i_sb,
|
|
"invalid lookback distance 0 @ nid %llu",
|
|
vi->nid);
|
|
DBG_BUGON(1);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
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:
|
|
erofs_err(m->inode->i_sb,
|
|
"unknown type %u @ lcn %lu of nid %llu",
|
|
m->type, lcn, vi->nid);
|
|
DBG_BUGON(1);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int z_erofs_map_blocks_iter(struct inode *inode,
|
|
struct erofs_map_blocks *map,
|
|
int flags)
|
|
{
|
|
struct erofs_inode *const vi = EROFS_I(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 (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 (!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 correspoinding first chunk */
|
|
err = vle_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;
|
|
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:
|
|
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);
|
|
|
|
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;
|
|
}
|
|
|