erofs: introduce physical cluster slab pools

[linux-2.6-microblaze.git] / fs / erofs / erofs_fs.h

diff --git a/fs/erofs/erofs_fs.h b/fs/erofs/erofs_fs.h
index 17bc0b5..7677767 100644 (file)
--- a/fs/erofs/erofs_fs.h
+++ b/fs/erofs/erofs_fs.h
@@ -201,6 +201,9 @@ static inline unsigned int erofs_xattr_entry_size(struct erofs_xattr_entry *e)
                                 e->e_name_len + le16_to_cpu(e->e_value_size));
 }
 
+/* maximum supported size of a physical compression cluster */
+#define Z_EROFS_PCLUSTER_MAX_SIZE      (1024 * 1024)
+
 /* available compression algorithm types (for h_algorithmtype) */
 enum {
        Z_EROFS_COMPRESSION_LZ4 = 0,
@@ -233,9 +236,7 @@ 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;
 };