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authorGao Xiang <hsiangkao@redhat.com>2021-04-07 12:39:18 +0800
committerGao Xiang <hsiangkao@redhat.com>2021-04-07 12:41:22 +0800
commit54e0b6c873dcbd02b9b479c893f6fba8fcbc6a9c (patch)
treecc32143a352c780dc58f6f9da9b8ff2ca1135cf6 /fs/erofs
parentfe6adcce7e297fcb49f40c62df42334690c3f848 (diff)
downloadlinux-54e0b6c873dcbd02b9b479c893f6fba8fcbc6a9c.tar.bz2
erofs: reserve physical_clusterbits[]
Formal big pcluster design is actually more powerful / flexable than the previous thought whose pclustersize was fixed as power-of-2 blocks, which was obviously inefficient and space-wasting. Instead, pclustersize can now be set independently for each pcluster, so various pcluster sizes can also be used together in one file if mkfs wants (for example, according to data type and/or compression ratio). Let's get rid of previous physical_clusterbits[] setting (also notice that corresponding on-disk fields are still 0 for now). Therefore, head1/2 can be used for at most 2 different algorithms in one file and again pclustersize is now independent of these. Link: https://lore.kernel.org/r/20210407043927.10623-2-xiang@kernel.org Acked-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
Diffstat (limited to 'fs/erofs')
-rw-r--r--fs/erofs/erofs_fs.h4
-rw-r--r--fs/erofs/internal.h1
-rw-r--r--fs/erofs/zdata.c3
-rw-r--r--fs/erofs/zmap.c15
4 files changed, 2 insertions, 21 deletions
diff --git a/fs/erofs/erofs_fs.h b/fs/erofs/erofs_fs.h
index 17bc0b5f117d..626b7d3e9ab7 100644
--- a/fs/erofs/erofs_fs.h
+++ b/fs/erofs/erofs_fs.h
@@ -233,9 +233,7 @@ struct z_erofs_map_header {
__u8 h_algorithmtype;
/*
* bit 0-2 : logical cluster bits - 12, e.g. 0 for 4096;
- * bit 3-4 : (physical - logical) cluster bits of head 1:
- * For example, if logical clustersize = 4096, 1 for 8192.
- * bit 5-7 : (physical - logical) cluster bits of head 2.
+ * bit 3-7 : reserved.
*/
__u8 h_clusterbits;
};
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index 60063bbbb91a..05b02f99324c 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -266,7 +266,6 @@ struct erofs_inode {
unsigned short z_advise;
unsigned char z_algorithmtype[2];
unsigned char z_logical_clusterbits;
- unsigned char z_physical_clusterbits[2];
};
#endif /* CONFIG_EROFS_FS_ZIP */
};
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index 4226f4115981..e3f0100d82d1 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -430,8 +430,7 @@ static int z_erofs_register_collection(struct z_erofs_collector *clt,
else
pcl->algorithmformat = Z_EROFS_COMPRESSION_SHIFTED;
- pcl->clusterbits = EROFS_I(inode)->z_physical_clusterbits[0];
- pcl->clusterbits -= PAGE_SHIFT;
+ pcl->clusterbits = 0;
/* new pclusters should be claimed as type 1, primary and followed */
pcl->next = clt->owned_head;
diff --git a/fs/erofs/zmap.c b/fs/erofs/zmap.c
index b384f546d368..7fd6bd843471 100644
--- a/fs/erofs/zmap.c
+++ b/fs/erofs/zmap.c
@@ -17,11 +17,8 @@ int z_erofs_fill_inode(struct inode *inode)
vi->z_algorithmtype[0] = 0;
vi->z_algorithmtype[1] = 0;
vi->z_logical_clusterbits = LOG_BLOCK_SIZE;
- vi->z_physical_clusterbits[0] = vi->z_logical_clusterbits;
- vi->z_physical_clusterbits[1] = vi->z_logical_clusterbits;
set_bit(EROFS_I_Z_INITED_BIT, &vi->flags);
}
-
inode->i_mapping->a_ops = &z_erofs_aops;
return 0;
}
@@ -77,18 +74,6 @@ static int z_erofs_fill_inode_lazy(struct inode *inode)
}
vi->z_logical_clusterbits = LOG_BLOCK_SIZE + (h->h_clusterbits & 7);
- vi->z_physical_clusterbits[0] = vi->z_logical_clusterbits +
- ((h->h_clusterbits >> 3) & 3);
-
- if (vi->z_physical_clusterbits[0] != LOG_BLOCK_SIZE) {
- erofs_err(sb, "unsupported physical clusterbits %u for nid %llu, please upgrade kernel",
- vi->z_physical_clusterbits[0], vi->nid);
- err = -EOPNOTSUPP;
- goto unmap_done;
- }
-
- vi->z_physical_clusterbits[1] = vi->z_logical_clusterbits +
- ((h->h_clusterbits >> 5) & 7);
/* paired with smp_mb() at the beginning of the function */
smp_mb();
set_bit(EROFS_I_Z_INITED_BIT, &vi->flags);