nilfs2: add size option of private object to metadata file allocator
This adds an optional "object size" argument to nilfs_mdt_new_common()
function; the argument specifies the size of private object attached
to a newly allocated metadata file inode.
This will afford space to keep local variables for meta data files.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c
index f632611..62074e8 100644
--- a/fs/nilfs2/mdt.c
+++ b/fs/nilfs2/mdt.c
@@ -445,9 +445,17 @@
* longer than those of the super block structs; they may continue for
* several consecutive mounts/umounts. This would need discussions.
*/
+/**
+ * nilfs_mdt_new_common - allocate a pseudo inode for metadata file
+ * @nilfs: nilfs object
+ * @sb: super block instance the metadata file belongs to
+ * @ino: inode number
+ * @gfp_mask: gfp mask for data pages
+ * @objsz: size of the private object attached to inode->i_private
+ */
struct inode *
nilfs_mdt_new_common(struct the_nilfs *nilfs, struct super_block *sb,
- ino_t ino, gfp_t gfp_mask)
+ ino_t ino, gfp_t gfp_mask, size_t objsz)
{
struct inode *inode = nilfs_alloc_inode_common(nilfs);
@@ -455,8 +463,9 @@
return NULL;
else {
struct address_space * const mapping = &inode->i_data;
- struct nilfs_mdt_info *mi = kzalloc(sizeof(*mi), GFP_NOFS);
+ struct nilfs_mdt_info *mi;
+ mi = kzalloc(max(sizeof(*mi), objsz), GFP_NOFS);
if (!mi) {
nilfs_destroy_inode(inode);
return NULL;
@@ -513,11 +522,11 @@
}
struct inode *nilfs_mdt_new(struct the_nilfs *nilfs, struct super_block *sb,
- ino_t ino)
+ ino_t ino, size_t objsz)
{
- struct inode *inode = nilfs_mdt_new_common(nilfs, sb, ino,
- NILFS_MDT_GFP);
+ struct inode *inode;
+ inode = nilfs_mdt_new_common(nilfs, sb, ino, NILFS_MDT_GFP, objsz);
if (!inode)
return NULL;