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authorGao Xiang <gaoxiang25@huawei.com>2019-09-04 05:08:57 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-09-05 21:10:07 +0300
commitea559e7b8451a35b6d36813dde52b415c72ceb03 (patch)
treead199253ccdc51a0535036a796b27899b96b206a /fs/erofs
parenta5876e24f13f13483fbd602b972d35801fb80b74 (diff)
downloadlinux-ea559e7b8451a35b6d36813dde52b415c72ceb03.tar.xz
erofs: update erofs_fs.h comments
As Christoph said [1] [2], update it now. [1] https://lore.kernel.org/r/20190902124521.GA22153@infradead.org/ [2] https://lore.kernel.org/r/20190902120548.GB15931@infradead.org/ Reported-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Link: https://lore.kernel.org/r/20190904020912.63925-11-gaoxiang25@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/erofs')
-rw-r--r--fs/erofs/erofs_fs.h9
1 files changed, 5 insertions, 4 deletions
diff --git a/fs/erofs/erofs_fs.h b/fs/erofs/erofs_fs.h
index 18689e916e94..b1ee5654750d 100644
--- a/fs/erofs/erofs_fs.h
+++ b/fs/erofs/erofs_fs.h
@@ -1,5 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0-only OR Apache-2.0 */
/*
+ * EROFS (Enhanced ROM File System) on-disk format definition
+ *
* Copyright (C) 2017-2018 HUAWEI, Inc.
* http://www.huawei.com/
* Created by Gao Xiang <gaoxiang25@huawei.com>
@@ -7,7 +9,6 @@
#ifndef __EROFS_FS_H
#define __EROFS_FS_H
-/* Enhanced(Extended) ROM File System */
#define EROFS_SUPER_OFFSET 1024
/*
@@ -41,7 +42,7 @@ struct erofs_super_block {
};
/*
- * erofs inode datalayout:
+ * erofs inode datalayout (i_format in on-disk inode):
* 0 - inode plain without inline data A:
* inode, [xattrs], ... | ... | no-holed data
* 1 - inode VLE compression B (legacy):
@@ -187,7 +188,7 @@ static inline unsigned int erofs_xattr_entry_size(struct erofs_xattr_entry *e)
e->e_name_len + le16_to_cpu(e->e_value_size));
}
-/* available compression algorithm types */
+/* available compression algorithm types (for h_algorithmtype) */
enum {
Z_EROFS_COMPRESSION_LZ4 = 0,
Z_EROFS_COMPRESSION_MAX
@@ -222,7 +223,7 @@ struct z_erofs_map_header {
#define Z_EROFS_VLE_LEGACY_HEADER_PADDING 8
/*
- * Z_EROFS Variable-sized Logical Extent cluster type:
+ * Fixed-sized output compression ondisk Logical Extent cluster type:
* 0 - literal (uncompressed) cluster
* 1 - compressed cluster (for the head logical cluster)
* 2 - compressed cluster (for the other logical clusters)