1 files changed, 70 insertions, 28 deletions

diff --git a/fs/nilfs2/ifile.c b/fs/nilfs2/ifile.c
index 922d9dd42c8..6548c7851b4 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;
@@ -80,7 +84,7 @@ int nilfs_ifile_create_inode(struct inode *ifile, ino_t *out_ino,
 		return ret;
 	}
 	nilfs_palloc_commit_alloc_entry(ifile, &req);
-	nilfs_mdt_mark_buffer_dirty(req.pr_entry_bh);
+	mark_buffer_dirty(req.pr_entry_bh);
 	nilfs_mdt_mark_dirty(ifile);
 	*out_ino = (ino_t)req.pr_entry_nr;
 	*out_bh = req.pr_entry_bh;
@@ -122,13 +126,13 @@ int nilfs_ifile_delete_inode(struct inode *ifile, ino_t ino)
 		return ret;
 	}
 
-	kaddr = kmap_atomic(req.pr_entry_bh->b_page, KM_USER0);
+	kaddr = kmap_atomic(req.pr_entry_bh->b_page);
 	raw_inode = nilfs_palloc_block_get_entry(ifile, req.pr_entry_nr,
 						 req.pr_entry_bh, kaddr);
 	raw_inode->i_flags = 0;
-	kunmap_atomic(kaddr, KM_USER0);
+	kunmap_atomic(kaddr);
 
-	nilfs_mdt_mark_buffer_dirty(req.pr_entry_bh);
+	mark_buffer_dirty(req.pr_entry_bh);
 	brelse(req.pr_entry_bh);
 
 	nilfs_palloc_commit_free_entry(ifile, &req);
@@ -149,37 +153,75 @@ int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino,
 	}
 
 	err = nilfs_palloc_get_entry_block(ifile, ino, 0, out_bh);
-	if (unlikely(err)) {
-		if (err == -EINVAL)
-			nilfs_error(sb, __func__, "ifile is broken");
-		else
-			nilfs_warning(sb, __func__,
-				      "unable to read inode: %lu",
-				      (unsigned long) ino);
-	}
+	if (unlikely(err))
+		nilfs_warning(sb, __func__, "unable to read inode: %lu",
+			      (unsigned long) ino);
+	return err;
+}
+
+/**
+ * nilfs_ifile_count_free_inodes - calculate free inodes count
+ * @ifile: ifile inode
+ * @nmaxinodes: current maximum of available inodes count [out]
+ * @nfreeinodes: free inodes count [out]
+ */
+int nilfs_ifile_count_free_inodes(struct inode *ifile,
+				    u64 *nmaxinodes, u64 *nfreeinodes)
+{
+	u64 nused;
+	int err;
+
+	*nmaxinodes = 0;
+	*nfreeinodes = 0;
+
+	nused = atomic64_read(&NILFS_I(ifile)->i_root->inodes_count);
+	err = nilfs_palloc_count_max_entries(ifile, nused, nmaxinodes);
+	if (likely(!err))
+		*nfreeinodes = *nmaxinodes - nused;
 	return err;
 }
 
 /**
- * nilfs_ifile_new - create inode file
- * @sbi: nilfs_sb_info struct
+ * nilfs_ifile_read - read or get ifile inode
+ * @sb: super block instance
+ * @root: root object
  * @inode_size: size of an inode
+ * @raw_inode: on-disk ifile inode
+ * @inodep: buffer to store the inode
  */
-struct inode *nilfs_ifile_new(struct nilfs_sb_info *sbi, size_t inode_size)
+int nilfs_ifile_read(struct super_block *sb, struct nilfs_root *root,
+		     size_t inode_size, struct nilfs_inode *raw_inode,
+		     struct inode **inodep)
 {
 	struct inode *ifile;
 	int err;
 
-	ifile = nilfs_mdt_new(sbi->s_nilfs, sbi->s_super, NILFS_IFILE_INO,
-			      sizeof(struct nilfs_ifile_info));
-	if (ifile) {
-		err = nilfs_palloc_init_blockgroup(ifile, inode_size);
-		if (unlikely(err)) {
-			nilfs_mdt_destroy(ifile);
-			return NULL;
-		}
-		nilfs_palloc_setup_cache(ifile,
-					 &NILFS_IFILE_I(ifile)->palloc_cache);
-	}
-	return ifile;
+	ifile = nilfs_iget_locked(sb, root, NILFS_IFILE_INO);
+	if (unlikely(!ifile))
+		return -ENOMEM;
+	if (!(ifile->i_state & I_NEW))
+		goto out;
+
+	err = nilfs_mdt_init(ifile, NILFS_MDT_GFP,
+			     sizeof(struct nilfs_ifile_info));
+	if (err)
+		goto failed;
+
+	err = nilfs_palloc_init_blockgroup(ifile, inode_size);
+	if (err)
+		goto failed;
+
+	nilfs_palloc_setup_cache(ifile, &NILFS_IFILE_I(ifile)->palloc_cache);
+
+	err = nilfs_read_inode_common(ifile, raw_inode);
+	if (err)
+		goto failed;
+
+	unlock_new_inode(ifile);
+ out:
+	*inodep = ifile;
+	return 0;
+ failed:
+	iget_failed(ifile);
+	return err;
 }