commit 001b8ccd0650727e54ec16ef72bf1b8eeab7168e upstream.

In compact 4B, two adjacent lclusters are packed together as a unit to form on-disk indexes for effective random access, as below:

(amortized = 4, vcnt = 2) _____________________________________________ |___@_____ encoded bits __________|_ blkaddr _| 0 . amortized * vcnt = 8 . . . . amortized * vcnt - 4 = 4 . . .____________________________. |_type (2 bits)_|_clusterofs_|

Therefore, encoded bits for each pack are 32 bits (4 bytes). IOWs, since each lcluster can get 16 bits for its type and clusterofs, the maximum supported lclustersize for compact 4B format is 16k (14 bits).

Fix this to enable compact 4B format for 16k lclusters (blocks), which is tested on an arm64 server with 16k page size.

Fixes: 152a333a5895 ("staging: erofs: add compacted compression indexes support") Link: https://lore.kernel.org/r/20230601112341.56960-1-hsiangkao@linux.alibaba.com Signed-off-by: Gao Xiang hsiangkao@linux.alibaba.com --- resolve a trivial conflict.

fs/erofs/zmap.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/fs/erofs/zmap.c b/fs/erofs/zmap.c index f18194fd8d77..a5537a9f8f36 100644 --- a/fs/erofs/zmap.c +++ b/fs/erofs/zmap.c @@ -215,7 +215,7 @@ static int unpack_compacted_index(struct z_erofs_maprecorder *m, int i; u8 *in, type;

- if (1 << amortizedshift == 4) + if (1 << amortizedshift == 4 && lclusterbits <= 14) vcnt = 2; else if (1 << amortizedshift == 2 && lclusterbits == 12) vcnt = 16; @@ -273,7 +273,6 @@ static int compacted_load_cluster_from_disk(struct z_erofs_maprecorder *m, { 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); @@ -283,9 +282,6 @@ static int compacted_load_cluster_from_disk(struct z_erofs_maprecorder *m, erofs_off_t pos; int err;

- if (lclusterbits != 12) - return -EOPNOTSUPP; - if (lcn >= totalidx) return -EINVAL;