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authorVyacheslav Dubeyko <slava@dubeyko.com>2012-07-30 14:42:10 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-30 17:25:19 -0700
commitf5974c8f8cf431baf44e7127b669e3b1960f184f (patch)
tree93df5ca85bdb49be8dd6d2ce46e10fb1d6cc9411 /fs/nilfs2
parent8c74ac0557b4cabc9017c2740c5f62b330192416 (diff)
downloadlinux-f5974c8f8cf431baf44e7127b669e3b1960f184f.tar.gz
nilfs2: add omitted comments for different structures in driver implementation
Add omitted comments for different structures in driver implementation. Signed-off-by: Vyacheslav Dubeyko <slava@dubeyko.com> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/nilfs2')
-rw-r--r--fs/nilfs2/alloc.h14
-rw-r--r--fs/nilfs2/bmap.h7
-rw-r--r--fs/nilfs2/btnode.h8
-rw-r--r--fs/nilfs2/dat.c6
-rw-r--r--fs/nilfs2/export.h8
-rw-r--r--fs/nilfs2/ifile.c6
-rw-r--r--fs/nilfs2/inode.c7
-rw-r--r--fs/nilfs2/mdt.h7
-rw-r--r--fs/nilfs2/nilfs.h17
-rw-r--r--fs/nilfs2/sufile.c8
-rw-r--r--fs/nilfs2/the_nilfs.h3
11 files changed, 81 insertions, 10 deletions
diff --git a/fs/nilfs2/alloc.h b/fs/nilfs2/alloc.h
index f5fde36b9e2..fb723810054 100644
--- a/fs/nilfs2/alloc.h
+++ b/fs/nilfs2/alloc.h
@@ -76,15 +76,23 @@ int nilfs_palloc_freev(struct inode *, __u64 *, size_t);
#define nilfs_clear_bit_atomic ext2_clear_bit_atomic
#define nilfs_find_next_zero_bit find_next_zero_bit_le
-/*
- * persistent object allocator cache
+/**
+ * struct nilfs_bh_assoc - block offset and buffer head association
+ * @blkoff: block offset
+ * @bh: buffer head
*/
-
struct nilfs_bh_assoc {
unsigned long blkoff;
struct buffer_head *bh;
};
+/**
+ * struct nilfs_palloc_cache - persistent object allocator cache
+ * @lock: cache protecting lock
+ * @prev_desc: blockgroup descriptors cache
+ * @prev_bitmap: blockgroup bitmap cache
+ * @prev_entry: translation entries cache
+ */
struct nilfs_palloc_cache {
spinlock_t lock;
struct nilfs_bh_assoc prev_desc;
diff --git a/fs/nilfs2/bmap.h b/fs/nilfs2/bmap.h
index 40d9f453d31..b89e68076ad 100644
--- a/fs/nilfs2/bmap.h
+++ b/fs/nilfs2/bmap.h
@@ -135,6 +135,13 @@ struct nilfs_bmap {
/* state */
#define NILFS_BMAP_DIRTY 0x00000001
+/**
+ * struct nilfs_bmap_store - shadow copy of bmap state
+ * @data: cached raw block mapping of on-disk inode
+ * @last_allocated_key: cached value of last allocated key for data block
+ * @last_allocated_ptr: cached value of last allocated ptr for data block
+ * @state: cached value of state field of bmap structure
+ */
struct nilfs_bmap_store {
__le64 data[NILFS_BMAP_SIZE / sizeof(__le64)];
__u64 last_allocated_key;
diff --git a/fs/nilfs2/btnode.h b/fs/nilfs2/btnode.h
index 3a4dd2d8d3f..d876b565ce6 100644
--- a/fs/nilfs2/btnode.h
+++ b/fs/nilfs2/btnode.h
@@ -29,7 +29,13 @@
#include <linux/fs.h>
#include <linux/backing-dev.h>
-
+/**
+ * struct nilfs_btnode_chkey_ctxt - change key context
+ * @oldkey: old key of block's moving content
+ * @newkey: new key for block's content
+ * @bh: buffer head of old buffer
+ * @newbh: buffer head of new buffer
+ */
struct nilfs_btnode_chkey_ctxt {
__u64 oldkey;
__u64 newkey;
diff --git a/fs/nilfs2/dat.c b/fs/nilfs2/dat.c
index b5c13f3576b..fa0f80308c2 100644
--- a/fs/nilfs2/dat.c
+++ b/fs/nilfs2/dat.c
@@ -33,6 +33,12 @@
#define NILFS_CNO_MIN ((__u64)1)
#define NILFS_CNO_MAX (~(__u64)0)
+/**
+ * struct nilfs_dat_info - on-memory private data of DAT file
+ * @mi: on-memory private data of metadata file
+ * @palloc_cache: persistent object allocator cache of DAT file
+ * @shadow: shadow map of DAT file
+ */
struct nilfs_dat_info {
struct nilfs_mdt_info mi;
struct nilfs_palloc_cache palloc_cache;
diff --git a/fs/nilfs2/export.h b/fs/nilfs2/export.h
index a71cc412b65..19ccbf9522a 100644
--- a/fs/nilfs2/export.h
+++ b/fs/nilfs2/export.h
@@ -5,6 +5,14 @@
extern const struct export_operations nilfs_export_ops;
+/**
+ * struct nilfs_fid - NILFS file id type
+ * @cno: checkpoint number
+ * @ino: inode number
+ * @gen: file generation (version) for NFS
+ * @parent_gen: parent generation (version) for NFS
+ * @parent_ino: parent inode number
+ */
struct nilfs_fid {
u64 cno;
u64 ino;
diff --git a/fs/nilfs2/ifile.c b/fs/nilfs2/ifile.c
index 5a48df79d67..d8e65bde083 100644
--- a/fs/nilfs2/ifile.c
+++ b/fs/nilfs2/ifile.c
@@ -29,7 +29,11 @@
#include "alloc.h"
#include "ifile.h"
-
+/**
+ * struct nilfs_ifile_info - on-memory private data of ifile
+ * @mi: on-memory private data of metadata file
+ * @palloc_cache: persistent object allocator cache of ifile
+ */
struct nilfs_ifile_info {
struct nilfs_mdt_info mi;
struct nilfs_palloc_cache palloc_cache;
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index 7cc64465ec2..6e2c3db976b 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -34,6 +34,13 @@
#include "cpfile.h"
#include "ifile.h"
+/**
+ * struct nilfs_iget_args - arguments used during comparison between inodes
+ * @ino: inode number
+ * @cno: checkpoint number
+ * @root: pointer on NILFS root object (mounted checkpoint)
+ * @for_gc: inode for GC flag
+ */
struct nilfs_iget_args {
u64 ino;
__u64 cno;
diff --git a/fs/nilfs2/mdt.h b/fs/nilfs2/mdt.h
index ab20a4baa50..ab172e8549c 100644
--- a/fs/nilfs2/mdt.h
+++ b/fs/nilfs2/mdt.h
@@ -28,6 +28,13 @@
#include "nilfs.h"
#include "page.h"
+/**
+ * struct nilfs_shadow_map - shadow mapping of meta data file
+ * @bmap_store: shadow copy of bmap state
+ * @frozen_data: shadowed dirty data pages
+ * @frozen_btnodes: shadowed dirty b-tree nodes' pages
+ * @frozen_buffers: list of frozen buffers
+ */
struct nilfs_shadow_map {
struct nilfs_bmap_store bmap_store;
struct address_space frozen_data;
diff --git a/fs/nilfs2/nilfs.h b/fs/nilfs2/nilfs.h
index 250add84da7..74cece80e9a 100644
--- a/fs/nilfs2/nilfs.h
+++ b/fs/nilfs2/nilfs.h
@@ -32,8 +32,21 @@
#include "the_nilfs.h"
#include "bmap.h"
-/*
- * nilfs inode data in memory
+/**
+ * struct nilfs_inode_info - nilfs inode data in memory
+ * @i_flags: inode flags
+ * @i_state: dynamic state flags
+ * @i_bmap: pointer on i_bmap_data
+ * @i_bmap_data: raw block mapping
+ * @i_xattr: <TODO>
+ * @i_dir_start_lookup: page index of last successful search
+ * @i_cno: checkpoint number for GC inode
+ * @i_btnode_cache: cached pages of b-tree nodes
+ * @i_dirty: list for connecting dirty files
+ * @xattr_sem: semaphore for extended attributes processing
+ * @i_bh: buffer contains disk inode
+ * @i_root: root object of the current filesystem tree
+ * @vfs_inode: VFS inode object
*/
struct nilfs_inode_info {
__u32 i_flags;
diff --git a/fs/nilfs2/sufile.c b/fs/nilfs2/sufile.c
index c5b7653a439..3127e9f438a 100644
--- a/fs/nilfs2/sufile.c
+++ b/fs/nilfs2/sufile.c
@@ -30,7 +30,13 @@
#include "mdt.h"
#include "sufile.h"
-
+/**
+ * struct nilfs_sufile_info - on-memory private data of sufile
+ * @mi: on-memory private data of metadata file
+ * @ncleansegs: number of clean segments
+ * @allocmin: lower limit of allocatable segment range
+ * @allocmax: upper limit of allocatable segment range
+ */
struct nilfs_sufile_info {
struct nilfs_mdt_info mi;
unsigned long ncleansegs;/* number of clean segments */
diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h
index 2558f320b82..6eee4177807 100644
--- a/fs/nilfs2/the_nilfs.h
+++ b/fs/nilfs2/the_nilfs.h
@@ -232,9 +232,8 @@ THE_NILFS_FNS(SB_DIRTY, sb_dirty)
* @count: refcount of this structure
* @nilfs: nilfs object
* @ifile: inode file
- * @root: root inode
* @inodes_count: number of inodes
- * @blocks_count: number of blocks (Reserved)
+ * @blocks_count: number of blocks
*/
struct nilfs_root {
__u64 cno;