1 files changed, 69 insertions, 56 deletions

diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 4317f72568e6..e78b68a81aec 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -13,11 +13,7 @@
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
- *
- * Written by Ryusuke Konishi <ryusuke@osrg.net>
+ * Written by Ryusuke Konishi.
  *
  */
 
@@ -49,18 +45,26 @@
  */
 #define SC_N_INODEVEC	16   /* Size of locally allocated inode vector */
 
-#define SC_MAX_SEGDELTA 64   /* Upper limit of the number of segments
-				appended in collection retry loop */
+#define SC_MAX_SEGDELTA 64   /*
+			      * Upper limit of the number of segments
+			      * appended in collection retry loop
+			      */
 
 /* Construction mode */
 enum {
 	SC_LSEG_SR = 1,	/* Make a logical segment having a super root */
-	SC_LSEG_DSYNC,	/* Flush data blocks of a given file and make
-			   a logical segment without a super root */
-	SC_FLUSH_FILE,	/* Flush data files, leads to segment writes without
-			   creating a checkpoint */
-	SC_FLUSH_DAT,	/* Flush DAT file. This also creates segments without
-			   a checkpoint */
+	SC_LSEG_DSYNC,	/*
+			 * Flush data blocks of a given file and make
+			 * a logical segment without a super root.
+			 */
+	SC_FLUSH_FILE,	/*
+			 * Flush data files, leads to segment writes without
+			 * creating a checkpoint.
+			 */
+	SC_FLUSH_DAT,	/*
+			 * Flush DAT file.  This also creates segments
+			 * without a checkpoint.
+			 */
 };
 
 /* Stage numbers of dirty block collection */
@@ -154,17 +158,15 @@ static int nilfs_prepare_segment_lock(struct nilfs_transaction_info *ti)
 	if (cur_ti) {
 		if (cur_ti->ti_magic == NILFS_TI_MAGIC)
 			return ++cur_ti->ti_count;
-		else {
-			/*
-			 * If journal_info field is occupied by other FS,
-			 * it is saved and will be restored on
-			 * nilfs_transaction_commit().
-			 */
-			printk(KERN_WARNING
-			       "NILFS warning: journal info from a different "
-			       "FS\n");
-			save = current->journal_info;
-		}
+
+		/*
+		 * If journal_info field is occupied by other FS,
+		 * it is saved and will be restored on
+		 * nilfs_transaction_commit().
+		 */
+		printk(KERN_WARNING
+		       "NILFS warning: journal info from a different FS\n");
+		save = current->journal_info;
 	}
 	if (!ti) {
 		ti = kmem_cache_alloc(nilfs_transaction_cachep, GFP_NOFS);
@@ -397,10 +399,10 @@ static void nilfs_transaction_unlock(struct super_block *sb)
 
 static void *nilfs_segctor_map_segsum_entry(struct nilfs_sc_info *sci,
 					    struct nilfs_segsum_pointer *ssp,
-					    unsigned bytes)
+					    unsigned int bytes)
 {
 	struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
-	unsigned blocksize = sci->sc_super->s_blocksize;
+	unsigned int blocksize = sci->sc_super->s_blocksize;
 	void *p;
 
 	if (unlikely(ssp->offset + bytes > blocksize)) {
@@ -422,8 +424,8 @@ static int nilfs_segctor_reset_segment_buffer(struct nilfs_sc_info *sci)
 {
 	struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
 	struct buffer_head *sumbh;
-	unsigned sumbytes;
-	unsigned flags = 0;
+	unsigned int sumbytes;
+	unsigned int flags = 0;
 	int err;
 
 	if (nilfs_doing_gc())
@@ -444,8 +446,10 @@ static int nilfs_segctor_feed_segment(struct nilfs_sc_info *sci)
 {
 	sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks;
 	if (NILFS_SEGBUF_IS_LAST(sci->sc_curseg, &sci->sc_segbufs))
-		return -E2BIG; /* The current segment is filled up
-				  (internal code) */
+		return -E2BIG; /*
+				* The current segment is filled up
+				* (internal code)
+				*/
 	sci->sc_curseg = NILFS_NEXT_SEGBUF(sci->sc_curseg);
 	return nilfs_segctor_reset_segment_buffer(sci);
 }
@@ -472,9 +476,9 @@ static int nilfs_segctor_add_super_root(struct nilfs_sc_info *sci)
  */
 static int nilfs_segctor_segsum_block_required(
 	struct nilfs_sc_info *sci, const struct nilfs_segsum_pointer *ssp,
-	unsigned binfo_size)
+	unsigned int binfo_size)
 {
-	unsigned blocksize = sci->sc_super->s_blocksize;
+	unsigned int blocksize = sci->sc_super->s_blocksize;
 	/* Size of finfo and binfo is enough small against blocksize */
 
 	return ssp->offset + binfo_size +
@@ -533,7 +537,7 @@ static void nilfs_segctor_end_finfo(struct nilfs_sc_info *sci,
 static int nilfs_segctor_add_file_block(struct nilfs_sc_info *sci,
 					struct buffer_head *bh,
 					struct inode *inode,
-					unsigned binfo_size)
+					unsigned int binfo_size)
 {
 	struct nilfs_segment_buffer *segbuf;
 	int required, err = 0;
@@ -617,7 +621,7 @@ static void nilfs_write_file_node_binfo(struct nilfs_sc_info *sci,
 	*vblocknr = binfo->bi_v.bi_vblocknr;
 }
 
-static struct nilfs_sc_operations nilfs_sc_file_ops = {
+static const struct nilfs_sc_operations nilfs_sc_file_ops = {
 	.collect_data = nilfs_collect_file_data,
 	.collect_node = nilfs_collect_file_node,
 	.collect_bmap = nilfs_collect_file_bmap,
@@ -666,7 +670,7 @@ static void nilfs_write_dat_node_binfo(struct nilfs_sc_info *sci,
 	*binfo_dat = binfo->bi_dat;
 }
 
-static struct nilfs_sc_operations nilfs_sc_dat_ops = {
+static const struct nilfs_sc_operations nilfs_sc_dat_ops = {
 	.collect_data = nilfs_collect_dat_data,
 	.collect_node = nilfs_collect_file_node,
 	.collect_bmap = nilfs_collect_dat_bmap,
@@ -674,7 +678,7 @@ static struct nilfs_sc_operations nilfs_sc_dat_ops = {
 	.write_node_binfo = nilfs_write_dat_node_binfo,
 };
 
-static struct nilfs_sc_operations nilfs_sc_dsync_ops = {
+static const struct nilfs_sc_operations nilfs_sc_dsync_ops = {
 	.collect_data = nilfs_collect_file_data,
 	.collect_node = NULL,
 	.collect_bmap = NULL,
@@ -777,7 +781,7 @@ static void nilfs_dispose_list(struct the_nilfs *nilfs,
 {
 	struct nilfs_inode_info *ii, *n;
 	struct nilfs_inode_info *ivec[SC_N_INODEVEC], **pii;
-	unsigned nv = 0;
+	unsigned int nv = 0;
 
 	while (!list_empty(head)) {
 		spin_lock(&nilfs->ns_inode_lock);
@@ -875,9 +879,11 @@ static int nilfs_segctor_create_checkpoint(struct nilfs_sc_info *sci)
 	err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 1,
 					  &raw_cp, &bh_cp);
 	if (likely(!err)) {
-		/* The following code is duplicated with cpfile.  But, it is
-		   needed to collect the checkpoint even if it was not newly
-		   created */
+		/*
+		 * The following code is duplicated with cpfile.  But, it is
+		 * needed to collect the checkpoint even if it was not newly
+		 * created.
+		 */
 		mark_buffer_dirty(bh_cp);
 		nilfs_mdt_mark_dirty(nilfs->ns_cpfile);
 		nilfs_cpfile_put_checkpoint(
@@ -958,7 +964,7 @@ static void nilfs_segctor_fill_in_super_root(struct nilfs_sc_info *sci,
 {
 	struct buffer_head *bh_sr;
 	struct nilfs_super_root *raw_sr;
-	unsigned isz, srsz;
+	unsigned int isz, srsz;
 
 	bh_sr = NILFS_LAST_SEGBUF(&sci->sc_segbufs)->sb_super_root;
 	raw_sr = (struct nilfs_super_root *)bh_sr->b_data;
@@ -1043,7 +1049,7 @@ static size_t nilfs_segctor_buffer_rest(struct nilfs_sc_info *sci)
 
 static int nilfs_segctor_scan_file(struct nilfs_sc_info *sci,
 				   struct inode *inode,
-				   struct nilfs_sc_operations *sc_ops)
+				   const struct nilfs_sc_operations *sc_ops)
 {
 	LIST_HEAD(data_buffers);
 	LIST_HEAD(node_buffers);
@@ -1406,8 +1412,10 @@ static void nilfs_free_incomplete_logs(struct list_head *logs,
 	if (atomic_read(&segbuf->sb_err)) {
 		/* Case 1: The first segment failed */
 		if (segbuf->sb_pseg_start != segbuf->sb_fseg_start)
-			/* Case 1a:  Partial segment appended into an existing
-			   segment */
+			/*
+			 * Case 1a:  Partial segment appended into an existing
+			 * segment
+			 */
 			nilfs_terminate_segment(nilfs, segbuf->sb_fseg_start,
 						segbuf->sb_fseg_end);
 		else /* Case 1b:  New full segment */
@@ -1550,7 +1558,7 @@ nilfs_segctor_update_payload_blocknr(struct nilfs_sc_info *sci,
 	sector_t blocknr;
 	unsigned long nfinfo = segbuf->sb_sum.nfinfo;
 	unsigned long nblocks = 0, ndatablk = 0;
-	struct nilfs_sc_operations *sc_op = NULL;
+	const struct nilfs_sc_operations *sc_op = NULL;
 	struct nilfs_segsum_pointer ssp;
 	struct nilfs_finfo *finfo = NULL;
 	union nilfs_binfo binfo;
@@ -1631,8 +1639,10 @@ static int nilfs_segctor_assign(struct nilfs_sc_info *sci, int mode)
 static void nilfs_begin_page_io(struct page *page)
 {
 	if (!page || PageWriteback(page))
-		/* For split b-tree node pages, this function may be called
-		   twice.  We ignore the 2nd or later calls by this check. */
+		/*
+		 * For split b-tree node pages, this function may be called
+		 * twice.  We ignore the 2nd or later calls by this check.
+		 */
 		return;
 
 	lock_page(page);
@@ -1942,7 +1952,7 @@ static int nilfs_segctor_collect_dirty_files(struct nilfs_sc_info *sci,
 				ifile, ii->vfs_inode.i_ino, &ibh);
 			if (unlikely(err)) {
 				nilfs_warning(sci->sc_super, __func__,
-					      "failed to get inode block.\n");
+					      "failed to get inode block.");
 				return err;
 			}
 			mark_buffer_dirty(ibh);
@@ -2395,6 +2405,7 @@ static int nilfs_segctor_construct(struct nilfs_sc_info *sci, int mode)
 static void nilfs_construction_timeout(unsigned long data)
 {
 	struct task_struct *p = (struct task_struct *)data;
+
 	wake_up_process(p);
 }
 
@@ -2555,10 +2566,10 @@ static int nilfs_segctor_thread(void *arg)
 
 		if (timeout || sci->sc_seq_request != sci->sc_seq_done)
 			mode = SC_LSEG_SR;
-		else if (!sci->sc_flush_request)
-			break;
-		else
+		else if (sci->sc_flush_request)
 			mode = nilfs_segctor_flush_mode(sci);
+		else
+			break;
 
 		spin_unlock(&sci->sc_state_lock);
 		nilfs_segctor_thread_construct(sci, mode);
@@ -2684,8 +2695,10 @@ static void nilfs_segctor_write_out(struct nilfs_sc_info *sci)
 {
 	int ret, retrycount = NILFS_SC_CLEANUP_RETRY;
 
-	/* The segctord thread was stopped and its timer was removed.
-	   But some tasks remain. */
+	/*
+	 * The segctord thread was stopped and its timer was removed.
+	 * But some tasks remain.
+	 */
 	do {
 		struct nilfs_transaction_info ti;
 
@@ -2727,13 +2740,13 @@ static void nilfs_segctor_destroy(struct nilfs_sc_info *sci)
 
 	if (!list_empty(&sci->sc_dirty_files)) {
 		nilfs_warning(sci->sc_super, __func__,
-			      "dirty file(s) after the final construction\n");
+			      "dirty file(s) after the final construction");
 		nilfs_dispose_list(nilfs, &sci->sc_dirty_files, 1);
 	}
 
 	if (!list_empty(&sci->sc_iput_queue)) {
 		nilfs_warning(sci->sc_super, __func__,
-			      "iput queue is not empty\n");
+			      "iput queue is not empty");
 		nilfs_dispose_list(nilfs, &sci->sc_iput_queue, 1);
 	}
 
@@ -2810,7 +2823,7 @@ void nilfs_detach_log_writer(struct super_block *sb)
 	if (!list_empty(&nilfs->ns_dirty_files)) {
 		list_splice_init(&nilfs->ns_dirty_files, &garbage_list);
 		nilfs_warning(sb, __func__,
-			      "Hit dirty file after stopped log writer\n");
+			      "Hit dirty file after stopped log writer");
 	}
 	spin_unlock(&nilfs->ns_inode_lock);
 	up_write(&nilfs->ns_segctor_sem);