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erofs: clean up header parsing for ztailpacking and fragments

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Simplify the logic in z_erofs_fill_inode_lazy() by combining the
handling of ztailpacking and fragments, as they are mutually exclusive.

Note that `h->h_clusterbits >> Z_EROFS_FRAGMENT_INODE_BIT` is handled
above, so no need to duplicate the check.

Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20250224123747.1387122-2-hsiangkao@linux.alibaba.com
This commit is contained in:
Gao Xiang
2025-02-24 20:37:47 +08:00
parent b7710262d7
commit 540787d38b
1 changed files with 14 additions and 25 deletions
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39
fs/erofs/zmap.c
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@@ -394,7 +394,8 @@ 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_inode *const vi = EROFS_I(inode);
struct erofs_inode *vi = EROFS_I(inode);
struct super_block *sb = inode->i_sb;
bool fragment = vi->z_advise & Z_EROFS_ADVISE_FRAGMENT_PCLUSTER;
bool ztailpacking = vi->z_idata_size;
struct z_erofs_maprecorder m = {
@@ -438,7 +439,7 @@ static int z_erofs_do_map_blocks(struct inode *inode,
}
/* 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(sb, "invalid logical cluster 0 at nid %llu",
vi->nid);
err = -EFSCORRUPTED;
goto unmap_out;
@@ -454,7 +455,7 @@ static int z_erofs_do_map_blocks(struct inode *inode,
goto unmap_out;
break;
default:
erofs_err(inode->i_sb, "unknown type %u @ offset %llu of nid %llu",
erofs_err(sb, "unknown type %u @ offset %llu of nid %llu",
m.type, ofs, vi->nid);
err = -EOPNOTSUPP;
goto unmap_out;
@@ -473,10 +474,16 @@ static int z_erofs_do_map_blocks(struct inode *inode,
map->m_flags |= EROFS_MAP_META;
map->m_pa = vi->z_fragmentoff;
map->m_plen = vi->z_idata_size;
if (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;
goto unmap_out;
}
} else if (fragment && m.lcn == vi->z_tailextent_headlcn) {
map->m_flags |= EROFS_MAP_FRAGMENT;
} else {
map->m_pa = erofs_pos(inode->i_sb, m.pblk);
map->m_pa = erofs_pos(sb, m.pblk);
err = z_erofs_get_extent_compressedlen(&m, initial_lcn);
if (err)
goto unmap_out;
@@ -495,7 +502,7 @@ static int z_erofs_do_map_blocks(struct inode *inode,
afmt = m.headtype == Z_EROFS_LCLUSTER_TYPE_HEAD2 ?
vi->z_algorithmtype[1] : vi->z_algorithmtype[0];
if (!(EROFS_I_SB(inode)->available_compr_algs & (1 << afmt))) {
erofs_err(inode->i_sb, "inconsistent algorithmtype %u for nid %llu",
erofs_err(sb, "inconsistent algorithmtype %u for nid %llu",
afmt, vi->nid);
err = -EFSCORRUPTED;
goto unmap_out;
@@ -596,26 +603,8 @@ static int z_erofs_fill_inode_lazy(struct inode *inode)
goto out_put_metabuf;
}
if (vi->z_idata_size) {
struct erofs_map_blocks map = {
.buf = __EROFS_BUF_INITIALIZER
};
err = z_erofs_do_map_blocks(inode, &map,
EROFS_GET_BLOCKS_FINDTAIL);
erofs_put_metabuf(&map.buf);
if (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;
}
if (err < 0)
goto out_put_metabuf;
}
if (vi->z_advise & Z_EROFS_ADVISE_FRAGMENT_PCLUSTER &&
!(h->h_clusterbits >> Z_EROFS_FRAGMENT_INODE_BIT)) {
if (vi->z_idata_size ||
(vi->z_advise & Z_EROFS_ADVISE_FRAGMENT_PCLUSTER)) {
struct erofs_map_blocks map = {
.buf = __EROFS_BUF_INITIALIZER
};