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Diffstat (limited to 'fs/erofs/zmap.c')
-rw-r--r--fs/erofs/zmap.c166
1 files changed, 74 insertions, 92 deletions
diff --git a/fs/erofs/zmap.c b/fs/erofs/zmap.c
index 655da4d739cb..d37c5c89c728 100644
--- a/fs/erofs/zmap.c
+++ b/fs/erofs/zmap.c
@@ -7,24 +7,6 @@
#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);
- struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
-
- if (!erofs_sb_has_big_pcluster(sbi) &&
- !erofs_sb_has_ztailpacking(sbi) && !erofs_sb_has_fragments(sbi) &&
- 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;
- set_bit(EROFS_I_Z_INITED_BIT, &vi->flags);
- }
- inode->i_mapping->a_ops = &z_erofs_aops;
- return 0;
-}
-
struct z_erofs_maprecorder {
struct inode *inode;
struct erofs_map_blocks *map;
@@ -45,47 +27,50 @@ static int legacy_load_cluster_from_disk(struct z_erofs_maprecorder *m,
{
struct inode *const inode = m->inode;
struct erofs_inode *const vi = EROFS_I(inode);
- const erofs_off_t pos =
- Z_EROFS_VLE_LEGACY_INDEX_ALIGN(erofs_iloc(inode) +
- vi->inode_isize + vi->xattr_isize) +
- lcn * sizeof(struct z_erofs_vle_decompressed_index);
- struct z_erofs_vle_decompressed_index *di;
+ const erofs_off_t pos = Z_EROFS_FULL_INDEX_ALIGN(erofs_iloc(inode) +
+ vi->inode_isize + vi->xattr_isize) +
+ lcn * sizeof(struct z_erofs_lcluster_index);
+ struct z_erofs_lcluster_index *di;
unsigned int advise, type;
m->kaddr = erofs_read_metabuf(&m->map->buf, inode->i_sb,
- erofs_blknr(pos), EROFS_KMAP);
+ erofs_blknr(inode->i_sb, pos), EROFS_KMAP);
if (IS_ERR(m->kaddr))
return PTR_ERR(m->kaddr);
- m->nextpackoff = pos + sizeof(struct z_erofs_vle_decompressed_index);
+ m->nextpackoff = pos + sizeof(struct z_erofs_lcluster_index);
m->lcn = lcn;
- di = m->kaddr + erofs_blkoff(pos);
+ di = m->kaddr + erofs_blkoff(inode->i_sb, 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);
+ type = (advise >> Z_EROFS_LI_LCLUSTER_TYPE_BIT) &
+ ((1 << Z_EROFS_LI_LCLUSTER_TYPE_BITS) - 1);
switch (type) {
- case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
+ case Z_EROFS_LCLUSTER_TYPE_NONHEAD:
m->clusterofs = 1 << vi->z_logical_clusterbits;
m->delta[0] = le16_to_cpu(di->di_u.delta[0]);
- if (m->delta[0] & Z_EROFS_VLE_DI_D0_CBLKCNT) {
+ if (m->delta[0] & Z_EROFS_LI_D0_CBLKCNT) {
if (!(vi->z_advise & (Z_EROFS_ADVISE_BIG_PCLUSTER_1 |
Z_EROFS_ADVISE_BIG_PCLUSTER_2))) {
DBG_BUGON(1);
return -EFSCORRUPTED;
}
m->compressedblks = m->delta[0] &
- ~Z_EROFS_VLE_DI_D0_CBLKCNT;
+ ~Z_EROFS_LI_D0_CBLKCNT;
m->delta[0] = 1;
}
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_HEAD1:
- case Z_EROFS_VLE_CLUSTER_TYPE_HEAD2:
- if (advise & Z_EROFS_VLE_DI_PARTIAL_REF)
+ case Z_EROFS_LCLUSTER_TYPE_PLAIN:
+ case Z_EROFS_LCLUSTER_TYPE_HEAD1:
+ case Z_EROFS_LCLUSTER_TYPE_HEAD2:
+ if (advise & Z_EROFS_LI_PARTIAL_REF)
m->partialref = true;
m->clusterofs = le16_to_cpu(di->di_clusterofs);
+ if (m->clusterofs >= 1 << vi->z_logical_clusterbits) {
+ DBG_BUGON(1);
+ return -EFSCORRUPTED;
+ }
m->pblk = le32_to_cpu(di->di_u.blkaddr);
break;
default:
@@ -121,13 +106,13 @@ static int get_compacted_la_distance(unsigned int lclusterbits,
lo = decode_compactedbits(lclusterbits, lomask,
in, encodebits * i, &type);
- if (type != Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD)
+ if (type != Z_EROFS_LCLUSTER_TYPE_NONHEAD)
return d1;
++d1;
} while (++i < vcnt);
- /* vcnt - 1 (Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD) item */
- if (!(lo & Z_EROFS_VLE_DI_D0_CBLKCNT))
+ /* vcnt - 1 (Z_EROFS_LCLUSTER_TYPE_NONHEAD) item */
+ if (!(lo & Z_EROFS_LI_D0_CBLKCNT))
d1 += lo - 1;
return d1;
}
@@ -156,7 +141,7 @@ static int unpack_compacted_index(struct z_erofs_maprecorder *m,
(vcnt << amortizedshift);
big_pcluster = vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_1;
encodebits = ((vcnt << amortizedshift) - sizeof(__le32)) * 8 / vcnt;
- eofs = erofs_blkoff(pos);
+ eofs = erofs_blkoff(m->inode->i_sb, pos);
base = round_down(eofs, vcnt << amortizedshift);
in = m->kaddr + base;
@@ -165,19 +150,19 @@ static int unpack_compacted_index(struct z_erofs_maprecorder *m,
lo = decode_compactedbits(lclusterbits, lomask,
in, encodebits * i, &type);
m->type = type;
- if (type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD) {
+ if (type == Z_EROFS_LCLUSTER_TYPE_NONHEAD) {
m->clusterofs = 1 << lclusterbits;
/* figure out lookahead_distance: delta[1] if needed */
if (lookahead)
m->delta[1] = get_compacted_la_distance(lclusterbits,
encodebits, vcnt, in, i);
- if (lo & Z_EROFS_VLE_DI_D0_CBLKCNT) {
+ if (lo & Z_EROFS_LI_D0_CBLKCNT) {
if (!big_pcluster) {
DBG_BUGON(1);
return -EFSCORRUPTED;
}
- m->compressedblks = lo & ~Z_EROFS_VLE_DI_D0_CBLKCNT;
+ m->compressedblks = lo & ~Z_EROFS_LI_D0_CBLKCNT;
m->delta[0] = 1;
return 0;
} else if (i + 1 != (int)vcnt) {
@@ -191,9 +176,9 @@ static int unpack_compacted_index(struct z_erofs_maprecorder *m,
*/
lo = decode_compactedbits(lclusterbits, lomask,
in, encodebits * (i - 1), &type);
- if (type != Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD)
+ if (type != Z_EROFS_LCLUSTER_TYPE_NONHEAD)
lo = 0;
- else if (lo & Z_EROFS_VLE_DI_D0_CBLKCNT)
+ else if (lo & Z_EROFS_LI_D0_CBLKCNT)
lo = 1;
m->delta[0] = lo + 1;
return 0;
@@ -207,7 +192,7 @@ static int unpack_compacted_index(struct z_erofs_maprecorder *m,
--i;
lo = decode_compactedbits(lclusterbits, lomask,
in, encodebits * i, &type);
- if (type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD)
+ if (type == Z_EROFS_LCLUSTER_TYPE_NONHEAD)
i -= lo;
if (i >= 0)
@@ -219,10 +204,10 @@ static int unpack_compacted_index(struct z_erofs_maprecorder *m,
--i;
lo = decode_compactedbits(lclusterbits, lomask,
in, encodebits * i, &type);
- if (type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD) {
- if (lo & Z_EROFS_VLE_DI_D0_CBLKCNT) {
+ if (type == Z_EROFS_LCLUSTER_TYPE_NONHEAD) {
+ if (lo & Z_EROFS_LI_D0_CBLKCNT) {
--i;
- nblk += lo & ~Z_EROFS_VLE_DI_D0_CBLKCNT;
+ nblk += lo & ~Z_EROFS_LI_D0_CBLKCNT;
continue;
}
/* bigpcluster shouldn't have plain d0 == 1 */
@@ -249,7 +234,7 @@ static int compacted_load_cluster_from_disk(struct z_erofs_maprecorder *m,
const unsigned int lclusterbits = vi->z_logical_clusterbits;
const erofs_off_t ebase = sizeof(struct z_erofs_map_header) +
ALIGN(erofs_iloc(inode) + vi->inode_isize + vi->xattr_isize, 8);
- const unsigned int totalidx = DIV_ROUND_UP(inode->i_size, EROFS_BLKSIZ);
+ unsigned int totalidx = erofs_iblks(inode);
unsigned int compacted_4b_initial, compacted_2b;
unsigned int amortizedshift;
erofs_off_t pos;
@@ -290,7 +275,7 @@ static int compacted_load_cluster_from_disk(struct z_erofs_maprecorder *m,
out:
pos += lcn * (1 << amortizedshift);
m->kaddr = erofs_read_metabuf(&m->map->buf, inode->i_sb,
- erofs_blknr(pos), EROFS_KMAP);
+ erofs_blknr(inode->i_sb, pos), EROFS_KMAP);
if (IS_ERR(m->kaddr))
return PTR_ERR(m->kaddr);
return unpack_compacted_index(m, amortizedshift, pos, lookahead);
@@ -301,10 +286,10 @@ static int z_erofs_load_cluster_from_disk(struct z_erofs_maprecorder *m,
{
const unsigned int datamode = EROFS_I(m->inode)->datalayout;
- if (datamode == EROFS_INODE_FLAT_COMPRESSION_LEGACY)
+ if (datamode == EROFS_INODE_COMPRESSED_FULL)
return legacy_load_cluster_from_disk(m, lcn);
- if (datamode == EROFS_INODE_FLAT_COMPRESSION)
+ if (datamode == EROFS_INODE_COMPRESSED_COMPACT)
return compacted_load_cluster_from_disk(m, lcn, lookahead);
return -EINVAL;
@@ -326,7 +311,7 @@ static int z_erofs_extent_lookback(struct z_erofs_maprecorder *m,
return err;
switch (m->type) {
- case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
+ case Z_EROFS_LCLUSTER_TYPE_NONHEAD:
if (!m->delta[0]) {
erofs_err(m->inode->i_sb,
"invalid lookback distance 0 @ nid %llu",
@@ -336,9 +321,9 @@ static int z_erofs_extent_lookback(struct z_erofs_maprecorder *m,
}
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:
+ case Z_EROFS_LCLUSTER_TYPE_PLAIN:
+ case Z_EROFS_LCLUSTER_TYPE_HEAD1:
+ case Z_EROFS_LCLUSTER_TYPE_HEAD2:
m->headtype = m->type;
m->map->m_la = (lcn << lclusterbits) | m->clusterofs;
return 0;
@@ -360,21 +345,22 @@ static int z_erofs_extent_lookback(struct z_erofs_maprecorder *m,
static int z_erofs_get_extent_compressedlen(struct z_erofs_maprecorder *m,
unsigned int initial_lcn)
{
+ struct super_block *sb = m->inode->i_sb;
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 != Z_EROFS_LCLUSTER_TYPE_PLAIN &&
+ m->type != Z_EROFS_LCLUSTER_TYPE_HEAD1 &&
+ m->type != Z_EROFS_LCLUSTER_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) &&
+ if (m->headtype == Z_EROFS_LCLUSTER_TYPE_PLAIN ||
+ ((m->headtype == Z_EROFS_LCLUSTER_TYPE_HEAD1) &&
!(vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_1)) ||
- ((m->headtype == Z_EROFS_VLE_CLUSTER_TYPE_HEAD2) &&
+ ((m->headtype == Z_EROFS_LCLUSTER_TYPE_HEAD2) &&
!(vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_2))) {
map->m_plen = 1ULL << lclusterbits;
return 0;
@@ -396,19 +382,19 @@ static int z_erofs_get_extent_compressedlen(struct z_erofs_maprecorder *m,
* 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);
+ m->type == Z_EROFS_LCLUSTER_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:
+ case Z_EROFS_LCLUSTER_TYPE_PLAIN:
+ case Z_EROFS_LCLUSTER_TYPE_HEAD1:
+ case Z_EROFS_LCLUSTER_TYPE_HEAD2:
/*
* if the 1st NONHEAD lcluster is actually PLAIN or HEAD type
* rather than CBLKCNT, it's a 1 lcluster-sized pcluster.
*/
- m->compressedblks = 1 << (lclusterbits - LOG_BLOCK_SIZE);
+ m->compressedblks = 1 << (lclusterbits - sb->s_blocksize_bits);
break;
- case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
+ case Z_EROFS_LCLUSTER_TYPE_NONHEAD:
if (m->delta[0] != 1)
goto err_bonus_cblkcnt;
if (m->compressedblks)
@@ -422,7 +408,7 @@ static int z_erofs_get_extent_compressedlen(struct z_erofs_maprecorder *m,
return -EFSCORRUPTED;
}
out:
- map->m_plen = (u64)m->compressedblks << LOG_BLOCK_SIZE;
+ map->m_plen = erofs_pos(sb, m->compressedblks);
return 0;
err_bonus_cblkcnt:
erofs_err(m->inode->i_sb,
@@ -452,12 +438,12 @@ static int z_erofs_get_extent_decompressedlen(struct z_erofs_maprecorder *m)
if (err)
return err;
- if (m->type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD) {
+ if (m->type == Z_EROFS_LCLUSTER_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) {
+ } else if (m->type == Z_EROFS_LCLUSTER_TYPE_PLAIN ||
+ m->type == Z_EROFS_LCLUSTER_TYPE_HEAD1 ||
+ m->type == Z_EROFS_LCLUSTER_TYPE_HEAD2) {
/* go on until the next HEAD lcluster */
if (lcn != headlcn)
break;
@@ -476,8 +462,7 @@ static int z_erofs_get_extent_decompressedlen(struct z_erofs_maprecorder *m)
}
static int z_erofs_do_map_blocks(struct inode *inode,
- struct erofs_map_blocks *map,
- int flags)
+ 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;
@@ -507,9 +492,9 @@ static int z_erofs_do_map_blocks(struct inode *inode,
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:
+ case Z_EROFS_LCLUSTER_TYPE_PLAIN:
+ case Z_EROFS_LCLUSTER_TYPE_HEAD1:
+ case Z_EROFS_LCLUSTER_TYPE_HEAD2:
if (endoff >= m.clusterofs) {
m.headtype = m.type;
map->m_la = (m.lcn << lclusterbits) | m.clusterofs;
@@ -534,7 +519,7 @@ static int z_erofs_do_map_blocks(struct inode *inode,
map->m_flags |= EROFS_MAP_FULL_MAPPED;
m.delta[0] = 1;
fallthrough;
- case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
+ case Z_EROFS_LCLUSTER_TYPE_NONHEAD:
/* get the corresponding first chunk */
err = z_erofs_extent_lookback(&m, m.delta[0]);
if (err)
@@ -555,7 +540,7 @@ static int z_erofs_do_map_blocks(struct inode *inode,
vi->z_tailextent_headlcn = m.lcn;
/* for non-compact indexes, fragmentoff is 64 bits */
if (fragment &&
- vi->datalayout == EROFS_INODE_FLAT_COMPRESSION_LEGACY)
+ vi->datalayout == EROFS_INODE_COMPRESSED_FULL)
vi->z_fragmentoff |= (u64)m.pblk << 32;
}
if (ztailpacking && m.lcn == vi->z_tailextent_headlcn) {
@@ -565,13 +550,13 @@ static int z_erofs_do_map_blocks(struct inode *inode,
} else if (fragment && m.lcn == vi->z_tailextent_headlcn) {
map->m_flags |= EROFS_MAP_FRAGMENT;
} else {
- map->m_pa = blknr_to_addr(m.pblk);
+ map->m_pa = erofs_pos(inode->i_sb, m.pblk);
err = z_erofs_get_extent_compressedlen(&m, initial_lcn);
if (err)
goto unmap_out;
}
- if (m.headtype == Z_EROFS_VLE_CLUSTER_TYPE_PLAIN) {
+ if (m.headtype == Z_EROFS_LCLUSTER_TYPE_PLAIN) {
if (map->m_llen > map->m_plen) {
DBG_BUGON(1);
err = -EFSCORRUPTED;
@@ -583,7 +568,7 @@ static int z_erofs_do_map_blocks(struct inode *inode,
else
map->m_algorithmformat =
Z_EROFS_COMPRESSION_SHIFTED;
- } else if (m.headtype == Z_EROFS_VLE_CLUSTER_TYPE_HEAD2) {
+ } else if (m.headtype == Z_EROFS_LCLUSTER_TYPE_HEAD2) {
map->m_algorithmformat = vi->z_algorithmtype[1];
} else {
map->m_algorithmformat = vi->z_algorithmtype[0];
@@ -592,7 +577,7 @@ static int z_erofs_do_map_blocks(struct inode *inode,
if ((flags & EROFS_GET_BLOCKS_FIEMAP) ||
((flags & EROFS_GET_BLOCKS_READMORE) &&
map->m_algorithmformat == Z_EROFS_COMPRESSION_LZMA &&
- map->m_llen >= EROFS_BLKSIZ)) {
+ map->m_llen >= i_blocksize(inode))) {
err = z_erofs_get_extent_decompressedlen(&m);
if (!err)
map->m_flags |= EROFS_MAP_FULL_MAPPED;
@@ -600,9 +585,6 @@ static int z_erofs_do_map_blocks(struct inode *inode,
unmap_out:
erofs_unmap_metabuf(&m.map->buf);
- 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;
}
@@ -633,13 +615,13 @@ static int z_erofs_fill_inode_lazy(struct inode *inode)
goto out_unlock;
pos = ALIGN(erofs_iloc(inode) + vi->inode_isize + vi->xattr_isize, 8);
- kaddr = erofs_read_metabuf(&buf, sb, erofs_blknr(pos), EROFS_KMAP);
+ kaddr = erofs_read_metabuf(&buf, sb, erofs_blknr(sb, pos), EROFS_KMAP);
if (IS_ERR(kaddr)) {
err = PTR_ERR(kaddr);
goto out_unlock;
}
- h = kaddr + erofs_blkoff(pos);
+ h = kaddr + erofs_blkoff(sb, pos);
/*
* if the highest bit of the 8-byte map header is set, the whole file
* is stored in the packed inode. The rest bits keeps z_fragmentoff.
@@ -663,7 +645,7 @@ static int z_erofs_fill_inode_lazy(struct inode *inode)
goto out_put_metabuf;
}
- vi->z_logical_clusterbits = LOG_BLOCK_SIZE + (h->h_clusterbits & 7);
+ vi->z_logical_clusterbits = sb->s_blocksize_bits + (h->h_clusterbits & 7);
if (!erofs_sb_has_big_pcluster(EROFS_SB(sb)) &&
vi->z_advise & (Z_EROFS_ADVISE_BIG_PCLUSTER_1 |
Z_EROFS_ADVISE_BIG_PCLUSTER_2)) {
@@ -672,7 +654,7 @@ static int z_erofs_fill_inode_lazy(struct inode *inode)
err = -EFSCORRUPTED;
goto out_put_metabuf;
}
- if (vi->datalayout == EROFS_INODE_FLAT_COMPRESSION &&
+ if (vi->datalayout == EROFS_INODE_COMPRESSED_COMPACT &&
!(vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_1) ^
!(vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_2)) {
erofs_err(sb, "big pcluster head1/2 of compact indexes should be consistent for nid %llu",
@@ -692,7 +674,7 @@ static int z_erofs_fill_inode_lazy(struct inode *inode)
erofs_put_metabuf(&map.buf);
if (!map.m_plen ||
- erofs_blkoff(map.m_pa) + map.m_plen > EROFS_BLKSIZ) {
+ erofs_blkoff(sb, map.m_pa) + map.m_plen > sb->s_blocksize) {
erofs_err(sb, "invalid tail-packing pclustersize %llu",
map.m_plen);
err = -EFSCORRUPTED;