6.12-stable review patch. If anyone has any objections, please let me know.
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From: Hongzhen Luo hongzhen@linux.alibaba.com
[ Upstream commit 3b7781aeaefb627d4e07c1af9be923f9e8047d8b ]
There's no need to enumerate each type. No logic changes.
Signed-off-by: Hongzhen Luo hongzhen@linux.alibaba.com Reviewed-by: Gao Xiang hsiangkao@linux.alibaba.com Reviewed-by: Chao Yu chao@kernel.org Link: https://lore.kernel.org/r/20250210032923.3382136-1-hongzhen@linux.alibaba.co... Signed-off-by: Gao Xiang hsiangkao@linux.alibaba.com Stable-dep-of: b44686c8391b ("erofs: fix large fragment handling") Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/erofs/zmap.c | 63 +++++++++++++++++++++----------------------------------- 1 file changed, 24 insertions(+), 39 deletions(-)
--- a/fs/erofs/zmap.c +++ b/fs/erofs/zmap.c @@ -265,26 +265,22 @@ static int z_erofs_extent_lookback(struc if (err) return err;
- switch (m->type) { - case Z_EROFS_LCLUSTER_TYPE_NONHEAD: + if (m->type >= Z_EROFS_LCLUSTER_TYPE_MAX) { + erofs_err(sb, "unknown type %u @ lcn %lu of nid %llu", + m->type, lcn, vi->nid); + DBG_BUGON(1); + return -EOPNOTSUPP; + } else if (m->type == Z_EROFS_LCLUSTER_TYPE_NONHEAD) { lookback_distance = m->delta[0]; if (!lookback_distance) - goto err_bogus; + break; continue; - case Z_EROFS_LCLUSTER_TYPE_PLAIN: - case Z_EROFS_LCLUSTER_TYPE_HEAD1: - case Z_EROFS_LCLUSTER_TYPE_HEAD2: + } else { m->headtype = m->type; m->map->m_la = (lcn << lclusterbits) | m->clusterofs; return 0; - default: - erofs_err(sb, "unknown type %u @ lcn %lu of nid %llu", - m->type, lcn, vi->nid); - DBG_BUGON(1); - return -EOPNOTSUPP; } } -err_bogus: erofs_err(sb, "bogus lookback distance %u @ lcn %lu of nid %llu", lookback_distance, m->lcn, vi->nid); DBG_BUGON(1); @@ -329,35 +325,28 @@ static int z_erofs_get_extent_compressed DBG_BUGON(lcn == initial_lcn && m->type == Z_EROFS_LCLUSTER_TYPE_NONHEAD);
- switch (m->type) { - case Z_EROFS_LCLUSTER_TYPE_PLAIN: - case Z_EROFS_LCLUSTER_TYPE_HEAD1: - case Z_EROFS_LCLUSTER_TYPE_HEAD2: + if (m->type == Z_EROFS_LCLUSTER_TYPE_NONHEAD) { + if (m->delta[0] != 1) { + erofs_err(sb, "bogus CBLKCNT @ lcn %lu of nid %llu", lcn, vi->nid); + DBG_BUGON(1); + return -EFSCORRUPTED; + } + if (m->compressedblks) + goto out; + } else if (m->type < Z_EROFS_LCLUSTER_TYPE_MAX) { /* * if the 1st NONHEAD lcluster is actually PLAIN or HEAD type * rather than CBLKCNT, it's a 1 block-sized pcluster. */ m->compressedblks = 1; - break; - case Z_EROFS_LCLUSTER_TYPE_NONHEAD: - if (m->delta[0] != 1) - goto err_bonus_cblkcnt; - if (m->compressedblks) - break; - fallthrough; - default: - erofs_err(sb, "cannot found CBLKCNT @ lcn %lu of nid %llu", lcn, - vi->nid); - DBG_BUGON(1); - return -EFSCORRUPTED; + goto out; } + erofs_err(sb, "cannot found CBLKCNT @ lcn %lu of nid %llu", lcn, vi->nid); + DBG_BUGON(1); + return -EFSCORRUPTED; out: m->map->m_plen = erofs_pos(sb, m->compressedblks); return 0; -err_bonus_cblkcnt: - erofs_err(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) @@ -386,9 +375,7 @@ static int z_erofs_get_extent_decompress m->delta[1] = 1; DBG_BUGON(1); } - } else if (m->type == Z_EROFS_LCLUSTER_TYPE_PLAIN || - m->type == Z_EROFS_LCLUSTER_TYPE_HEAD1 || - m->type == Z_EROFS_LCLUSTER_TYPE_HEAD2) { + } else if (m->type < Z_EROFS_LCLUSTER_TYPE_MAX) { if (lcn != headlcn) break; /* ends at the next HEAD lcluster */ m->delta[1] = 1; @@ -452,8 +439,7 @@ static int z_erofs_do_map_blocks(struct } /* m.lcn should be >= 1 if endoff < m.clusterofs */ if (!m.lcn) { - erofs_err(inode->i_sb, - "invalid logical cluster 0 at nid %llu", + erofs_err(inode->i_sb, "invalid logical cluster 0 at nid %llu", vi->nid); err = -EFSCORRUPTED; goto unmap_out; @@ -469,8 +455,7 @@ static int z_erofs_do_map_blocks(struct goto unmap_out; break; default: - erofs_err(inode->i_sb, - "unknown type %u @ offset %llu of nid %llu", + erofs_err(inode->i_sb, "unknown type %u @ offset %llu of nid %llu", m.type, ofs, vi->nid); err = -EOPNOTSUPP; goto unmap_out;