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Date: Thu, 19 Jul 2012 21:34:18 +0900
From: Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
linux-nilfs <linux-nilfs@...r.kernel.org>,
Vyacheslav Dubeyko <slava@...eyko.com>,
Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>
Subject: [PATCH 1/2] NILFS2: add omitted comments for structures in nilfs2_fs.h
From: Vyacheslav Dubeyko <slava@...eyko.com>
This patch adds omitted comments for structures in nilfs2_fs.h.
Signed-off-by: Vyacheslav Dubeyko <slava@...eyko.com>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>
---
include/linux/nilfs2_fs.h | 63 ++++++++++++++++++++++++++++-----------------
1 file changed, 39 insertions(+), 24 deletions(-)
diff --git a/include/linux/nilfs2_fs.h b/include/linux/nilfs2_fs.h
index 89bd4a4..9875576 100644
--- a/include/linux/nilfs2_fs.h
+++ b/include/linux/nilfs2_fs.h
@@ -293,7 +293,7 @@ struct nilfs_dir_entry {
__le64 inode; /* Inode number */
__le16 rec_len; /* Directory entry length */
__u8 name_len; /* Name length */
- __u8 file_type;
+ __u8 file_type; /* Dir entry type (file, dir, etc) */
char name[NILFS_NAME_LEN]; /* File name */
char pad;
};
@@ -395,7 +395,7 @@ union nilfs_binfo {
};
/**
- * struct nilfs_segment_summary - segment summary
+ * struct nilfs_segment_summary - segment summary header
* @ss_datasum: checksum of data
* @ss_sumsum: checksum of segment summary
* @ss_magic: magic number
@@ -683,9 +683,9 @@ struct nilfs_sufile_header {
/**
* nilfs_suinfo - segment usage information
- * @sui_lastmod:
- * @sui_nblocks:
- * @sui_flags:
+ * @sui_lastmod: timestamp of last modification
+ * @sui_nblocks: number of written blocks in segment
+ * @sui_flags: segment usage flags
*/
struct nilfs_suinfo {
__u64 sui_lastmod;
@@ -716,9 +716,10 @@ enum {
};
/**
- * struct nilfs_cpmode -
- * @cc_cno:
- * @cc_mode:
+ * struct nilfs_cpmode - change checkpoint mode structure
+ * @cm_cno: checkpoint number
+ * @cm_mode: mode of checkpoint
+ * @cm_pad: padding
*/
struct nilfs_cpmode {
__u64 cm_cno;
@@ -728,11 +729,11 @@ struct nilfs_cpmode {
/**
* struct nilfs_argv - argument vector
- * @v_base:
- * @v_nmembs:
- * @v_size:
- * @v_flags:
- * @v_index:
+ * @v_base: pointer on data array from userspace
+ * @v_nmembs: number of members in data array
+ * @v_size: size of data array in bytes
+ * @v_flags: flags
+ * @v_index: start number of target data items
*/
struct nilfs_argv {
__u64 v_base;
@@ -743,9 +744,9 @@ struct nilfs_argv {
};
/**
- * struct nilfs_period -
- * @p_start:
- * @p_end:
+ * struct nilfs_period - period of checkpoint numbers
+ * @p_start: start checkpoint number (inclusive)
+ * @p_end: end checkpoint number (exclusive)
*/
struct nilfs_period {
__u64 p_start;
@@ -753,7 +754,7 @@ struct nilfs_period {
};
/**
- * struct nilfs_cpstat -
+ * struct nilfs_cpstat - checkpoint statistics
* @cs_cno: checkpoint number
* @cs_ncps: number of checkpoints
* @cs_nsss: number of snapshots
@@ -765,7 +766,7 @@ struct nilfs_cpstat {
};
/**
- * struct nilfs_sustat -
+ * struct nilfs_sustat - segment usage statistics
* @ss_nsegs: number of segments
* @ss_ncleansegs: number of clean segments
* @ss_ndirtysegs: number of dirty segments
@@ -784,10 +785,10 @@ struct nilfs_sustat {
/**
* struct nilfs_vinfo - virtual block number information
- * @vi_vblocknr:
- * @vi_start:
- * @vi_end:
- * @vi_blocknr:
+ * @vi_vblocknr: virtual block number
+ * @vi_start: start checkpoint number (inclusive)
+ * @vi_end: end checkpoint number (exclusive)
+ * @vi_blocknr: disk block number
*/
struct nilfs_vinfo {
__u64 vi_vblocknr;
@@ -797,7 +798,15 @@ struct nilfs_vinfo {
};
/**
- * struct nilfs_vdesc -
+ * struct nilfs_vdesc - descriptor of virtual block number
+ * @vd_ino: inode number
+ * @vd_cno: checkpoint number
+ * @vd_vblocknr: virtual block number
+ * @vd_period: period of checkpoint numbers
+ * @vd_blocknr: disk block number
+ * @vd_offset: logical block offset inside a file
+ * @vd_flags: flags (data or node block)
+ * @vd_pad: padding
*/
struct nilfs_vdesc {
__u64 vd_ino;
@@ -811,7 +820,13 @@ struct nilfs_vdesc {
};
/**
- * struct nilfs_bdesc -
+ * struct nilfs_bdesc - descriptor of disk block number
+ * @bd_ino: inode number
+ * @bd_oblocknr: disk block address (for skipping dead blocks)
+ * @bd_blocknr: disk block address
+ * @bd_offset: logical block offset inside a file
+ * @bd_level: level in the b-tree organization
+ * @bd_pad: padding
*/
struct nilfs_bdesc {
__u64 bd_ino;
--
1.7.9.3
--
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