1 files changed, 19 insertions, 21 deletions

diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c
index 2dfd47714ae5..156bf6091a96 100644
--- a/fs/nilfs2/mdt.c
+++ b/fs/nilfs2/mdt.c
@@ -103,15 +103,12 @@ static int nilfs_mdt_create_block(struct inode *inode, unsigned long block,
                 goto failed_unlock;
 
         err = -EEXIST;
-        if (buffer_uptodate(bh) || buffer_mapped(bh))
+        if (buffer_uptodate(bh))
                 goto failed_bh;
-#if 0
-        /* The uptodate flag is not protected by the page lock, but
-           the mapped flag is.  Thus, we don't have to wait the buffer. */
+
         wait_on_buffer(bh);
         if (buffer_uptodate(bh))
                 goto failed_bh;
-#endif
 
         bh->b_bdev = nilfs->ns_bdev;
         err = nilfs_mdt_insert_new_block(inode, block, bh, init_block);
@@ -139,7 +136,7 @@ nilfs_mdt_submit_block(struct inode *inode, unsigned long blkoff,
                        int mode, struct buffer_head **out_bh)
 {
         struct buffer_head *bh;
-        unsigned long blknum = 0;
+        __u64 blknum = 0;
         int ret = -ENOMEM;
 
         bh = nilfs_grab_buffer(inode, inode->i_mapping, blkoff, 0);
@@ -162,17 +159,15 @@ nilfs_mdt_submit_block(struct inode *inode, unsigned long blkoff,
                 unlock_buffer(bh);
                 goto out;
         }
-        if (!buffer_mapped(bh)) { /* unused buffer */
-                ret = nilfs_bmap_lookup(NILFS_I(inode)->i_bmap, blkoff,
-                                        &blknum);
-                if (unlikely(ret)) {
-                        unlock_buffer(bh);
-                        goto failed_bh;
-                }
-                bh->b_bdev = NILFS_MDT(inode)->mi_nilfs->ns_bdev;
-                bh->b_blocknr = blknum;
-                set_buffer_mapped(bh);
+
+        ret = nilfs_bmap_lookup(NILFS_I(inode)->i_bmap, blkoff, &blknum);
+        if (unlikely(ret)) {
+                unlock_buffer(bh);
+                goto failed_bh;
         }
+        bh->b_bdev = NILFS_MDT(inode)->mi_nilfs->ns_bdev;
+        bh->b_blocknr = (sector_t)blknum;
+        set_buffer_mapped(bh);
 
         bh->b_end_io = end_buffer_read_sync;
         get_bh(bh);
@@ -402,6 +397,7 @@ nilfs_mdt_write_page(struct page *page, struct writeback_control *wbc)
         struct inode *inode = container_of(page->mapping,
                                            struct inode, i_data);
         struct super_block *sb = inode->i_sb;
+        struct the_nilfs *nilfs = NILFS_MDT(inode)->mi_nilfs;
         struct nilfs_sb_info *writer = NULL;
         int err = 0;
 
@@ -411,9 +407,10 @@ nilfs_mdt_write_page(struct page *page, struct writeback_control *wbc)
         if (page->mapping->assoc_mapping)
                 return 0; /* Do not request flush for shadow page cache */
         if (!sb) {
-                writer = nilfs_get_writer(NILFS_MDT(inode)->mi_nilfs);
+                down_read(&nilfs->ns_writer_sem);
+                writer = nilfs->ns_writer;
                 if (!writer) {
-                        nilfs_put_writer(NILFS_MDT(inode)->mi_nilfs);
+                        up_read(&nilfs->ns_writer_sem);
                         return -EROFS;
                 }
                 sb = writer->s_super;
@@ -425,7 +422,7 @@ nilfs_mdt_write_page(struct page *page, struct writeback_control *wbc)
                 nilfs_flush_segment(sb, inode->i_ino);
 
         if (writer)
-                nilfs_put_writer(NILFS_MDT(inode)->mi_nilfs);
+                up_read(&nilfs->ns_writer_sem);
         return err;
 }
 
@@ -516,9 +513,10 @@ nilfs_mdt_new_common(struct the_nilfs *nilfs, struct super_block *sb,
 }
 
 struct inode *nilfs_mdt_new(struct the_nilfs *nilfs, struct super_block *sb,
-                            ino_t ino, gfp_t gfp_mask)
+                            ino_t ino)
 {
-        struct inode *inode = nilfs_mdt_new_common(nilfs, sb, ino, gfp_mask);
+        struct inode *inode = nilfs_mdt_new_common(nilfs, sb, ino,
+                                                   NILFS_MDT_GFP);
 
         if (!inode)
                 return NULL;