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Diffstat (limited to 'fs/erofs/zmap.c')
-rw-r--r--fs/erofs/zmap.c92
1 files changed, 40 insertions, 52 deletions
diff --git a/fs/erofs/zmap.c b/fs/erofs/zmap.c
index e313c936351d..e980e29873a5 100644
--- a/fs/erofs/zmap.c
+++ b/fs/erofs/zmap.c
@@ -31,22 +31,20 @@ static int z_erofs_load_full_lcluster(struct z_erofs_maprecorder *m,
vi->inode_isize + vi->xattr_isize) +
lcn * sizeof(struct z_erofs_lcluster_index);
struct z_erofs_lcluster_index *di;
- unsigned int advise, type;
+ unsigned int advise;
m->kaddr = erofs_read_metabuf(&m->map->buf, inode->i_sb,
- erofs_blknr(inode->i_sb, pos), EROFS_KMAP);
+ pos, EROFS_KMAP);
if (IS_ERR(m->kaddr))
return PTR_ERR(m->kaddr);
m->nextpackoff = pos + sizeof(struct z_erofs_lcluster_index);
m->lcn = lcn;
- di = m->kaddr + erofs_blkoff(inode->i_sb, pos);
+ di = m->kaddr;
advise = le16_to_cpu(di->di_advise);
- type = (advise >> Z_EROFS_LI_LCLUSTER_TYPE_BIT) &
- ((1 << Z_EROFS_LI_LCLUSTER_TYPE_BITS) - 1);
- switch (type) {
- case Z_EROFS_LCLUSTER_TYPE_NONHEAD:
+ m->type = advise & Z_EROFS_LI_LCLUSTER_TYPE_MASK;
+ if (m->type == 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_LI_D0_CBLKCNT) {
@@ -60,24 +58,15 @@ static int z_erofs_load_full_lcluster(struct z_erofs_maprecorder *m,
m->delta[0] = 1;
}
m->delta[1] = le16_to_cpu(di->di_u.delta[1]);
- break;
- 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;
+ } else {
+ m->partialref = !!(advise & Z_EROFS_LI_PARTIAL_REF);
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:
- DBG_BUGON(1);
- return -EOPNOTSUPP;
}
- m->type = type;
return 0;
}
@@ -120,7 +109,7 @@ static int unpack_compacted_index(struct z_erofs_maprecorder *m,
{
struct erofs_inode *const vi = EROFS_I(m->inode);
const unsigned int lclusterbits = vi->z_logical_clusterbits;
- unsigned int vcnt, base, lo, lobits, encodebits, nblk, eofs;
+ unsigned int vcnt, lo, lobits, encodebits, nblk, bytes;
int i;
u8 *in, type;
bool big_pcluster;
@@ -138,11 +127,11 @@ static int unpack_compacted_index(struct z_erofs_maprecorder *m,
big_pcluster = vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_1;
lobits = max(lclusterbits, ilog2(Z_EROFS_LI_D0_CBLKCNT) + 1U);
encodebits = ((vcnt << amortizedshift) - sizeof(__le32)) * 8 / vcnt;
- eofs = erofs_blkoff(m->inode->i_sb, pos);
- base = round_down(eofs, vcnt << amortizedshift);
- in = m->kaddr + base;
+ bytes = pos & ((vcnt << amortizedshift) - 1);
- i = (eofs - base) >> amortizedshift;
+ in = m->kaddr - bytes;
+
+ i = bytes >> amortizedshift;
lo = decode_compactedbits(lobits, in, encodebits * i, &type);
m->type = type;
@@ -267,7 +256,7 @@ static int z_erofs_load_compact_lcluster(struct z_erofs_maprecorder *m,
out:
pos += lcn * (1 << amortizedshift);
m->kaddr = erofs_read_metabuf(&m->map->buf, inode->i_sb,
- erofs_blknr(inode->i_sb, pos), EROFS_KMAP);
+ pos, EROFS_KMAP);
if (IS_ERR(m->kaddr))
return PTR_ERR(m->kaddr);
return unpack_compacted_index(m, amortizedshift, pos, lookahead);
@@ -561,7 +550,8 @@ 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_algorithmformat == Z_EROFS_COMPRESSION_DEFLATE) &&
+ map->m_algorithmformat == Z_EROFS_COMPRESSION_DEFLATE ||
+ map->m_algorithmformat == Z_EROFS_COMPRESSION_ZSTD) &&
map->m_llen >= i_blocksize(inode))) {
err = z_erofs_get_extent_decompressedlen(&m);
if (!err)
@@ -580,7 +570,6 @@ static int z_erofs_fill_inode_lazy(struct inode *inode)
int err, headnr;
erofs_off_t pos;
struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
- void *kaddr;
struct z_erofs_map_header *h;
if (test_bit(EROFS_I_Z_INITED_BIT, &vi->flags)) {
@@ -600,13 +589,12 @@ 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(sb, pos), EROFS_KMAP);
- if (IS_ERR(kaddr)) {
- err = PTR_ERR(kaddr);
+ h = erofs_read_metabuf(&buf, sb, pos, EROFS_KMAP);
+ if (IS_ERR(h)) {
+ err = PTR_ERR(h);
goto out_unlock;
}
- 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.
@@ -698,32 +686,32 @@ int z_erofs_map_blocks_iter(struct inode *inode, struct erofs_map_blocks *map,
struct erofs_inode *const vi = EROFS_I(inode);
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) {
+ trace_erofs_map_blocks_enter(inode, map, flags);
+ if (map->m_la >= inode->i_size) { /* post-EOF unmapped extent */
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;
-
- if ((vi->z_advise & Z_EROFS_ADVISE_FRAGMENT_PCLUSTER) &&
- !vi->z_tailextent_headlcn) {
- map->m_la = 0;
- map->m_llen = inode->i_size;
- map->m_flags = EROFS_MAP_MAPPED | EROFS_MAP_FULL_MAPPED |
- EROFS_MAP_FRAGMENT;
- goto out;
+ } else {
+ err = z_erofs_fill_inode_lazy(inode);
+ if (!err) {
+ if ((vi->z_advise & Z_EROFS_ADVISE_FRAGMENT_PCLUSTER) &&
+ !vi->z_tailextent_headlcn) {
+ map->m_la = 0;
+ map->m_llen = inode->i_size;
+ map->m_flags = EROFS_MAP_MAPPED |
+ EROFS_MAP_FULL_MAPPED | EROFS_MAP_FRAGMENT;
+ } else {
+ err = z_erofs_do_map_blocks(inode, map, flags);
+ }
+ }
+ if (!err && (map->m_flags & EROFS_MAP_ENCODED) &&
+ unlikely(map->m_plen > Z_EROFS_PCLUSTER_MAX_SIZE ||
+ map->m_llen > Z_EROFS_PCLUSTER_MAX_DSIZE))
+ err = -EOPNOTSUPP;
+ if (err)
+ map->m_llen = 0;
}
-
- err = z_erofs_do_map_blocks(inode, map, flags);
-out:
- trace_z_erofs_map_blocks_iter_exit(inode, map, flags, err);
+ trace_erofs_map_blocks_exit(inode, map, flags, err);
return err;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-21 12:25:00 +0000