static int
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 inode *inode;
+ struct super_block *sb;
+ struct the_nilfs *nilfs;
struct nilfs_sb_info *writer = NULL;
int err = 0;
redirty_page_for_writepage(wbc, page);
unlock_page(page);
+ inode = page->mapping->host;
+ if (!inode)
+ return 0;
+
+ sb = inode->i_sb;
+ nilfs = NILFS_MDT(inode)->mi_nilfs;
+
if (page->mapping->assoc_mapping)
return 0; /* Do not request flush for shadow page cache */
if (!sb) {
static const struct inode_operations def_mdt_iops;
static const struct file_operations def_mdt_fops;
+
+int nilfs_mdt_init(struct inode *inode, struct the_nilfs *nilfs,
+ gfp_t gfp_mask, size_t objsz)
+{
+ struct nilfs_mdt_info *mi;
+
+ mi = kzalloc(max(sizeof(*mi), objsz), GFP_NOFS);
+ if (!mi)
+ return -ENOMEM;
+
+ mi->mi_nilfs = nilfs;
+ init_rwsem(&mi->mi_sem);
+ inode->i_private = mi;
+
+ inode->i_mode = S_IFREG;
+ mapping_set_gfp_mask(inode->i_mapping, gfp_mask);
+ inode->i_mapping->backing_dev_info = nilfs->ns_bdi;
+
+ return 0;
+}
+
/*
* NILFS2 uses pseudo inodes for meta data files such as DAT, cpfile, sufile,
* ifile, or gcinodes. This allows the B-tree code and segment constructor
* @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, size_t objsz)
+ ino_t ino)
{
struct inode *inode = nilfs_alloc_inode_common(nilfs);
return NULL;
else {
struct address_space * const mapping = &inode->i_data;
- struct nilfs_mdt_info *mi;
-
- mi = kzalloc(max(sizeof(*mi), objsz), GFP_NOFS);
- if (!mi) {
- nilfs_destroy_inode(inode);
- return NULL;
- }
- mi->mi_nilfs = nilfs;
- init_rwsem(&mi->mi_sem);
inode->i_sb = sb; /* sb may be NULL for some meta data files */
inode->i_blkbits = nilfs->ns_blocksize_bits;
atomic_set(&inode->i_count, 1);
inode->i_nlink = 1;
inode->i_ino = ino;
- inode->i_mode = S_IFREG;
- inode->i_private = mi;
#ifdef INIT_UNUSED_INODE_FIELDS
atomic_set(&inode->i_writecount, 0);
mapping->host = NULL; /* instead of inode */
mapping->flags = 0;
- mapping_set_gfp_mask(mapping, gfp_mask);
mapping->assoc_mapping = NULL;
- mapping->backing_dev_info = nilfs->ns_bdi;
inode->i_mapping = mapping;
}
{
struct inode *inode;
- inode = nilfs_mdt_new_common(nilfs, sb, ino, NILFS_MDT_GFP, objsz);
+ inode = nilfs_mdt_new_common(nilfs, sb, ino);
if (!inode)
return NULL;
+ if (nilfs_mdt_init(inode, nilfs, NILFS_MDT_GFP, objsz) < 0) {
+ nilfs_destroy_inode(inode);
+ return NULL;
+ }
inode->i_op = &def_mdt_iops;
inode->i_fop = &def_mdt_fops;
inode->i_mapping->a_ops = &def_mdt_aops;
&NILFS_I(orig)->i_btnode_cache;
}
+static const struct address_space_operations shadow_map_aops = {
+ .sync_page = block_sync_page,
+};
+
+/**
+ * nilfs_mdt_setup_shadow_map - setup shadow map and bind it to metadata file
+ * @inode: inode of the metadata file
+ * @shadow: shadow mapping
+ */
+int nilfs_mdt_setup_shadow_map(struct inode *inode,
+ struct nilfs_shadow_map *shadow)
+{
+ struct nilfs_mdt_info *mi = NILFS_MDT(inode);
+ struct backing_dev_info *bdi = NILFS_I_NILFS(inode)->ns_bdi;
+
+ INIT_LIST_HEAD(&shadow->frozen_buffers);
+ nilfs_mapping_init_once(&shadow->frozen_data);
+ nilfs_mapping_init(&shadow->frozen_data, bdi, &shadow_map_aops);
+ nilfs_mapping_init_once(&shadow->frozen_btnodes);
+ nilfs_mapping_init(&shadow->frozen_btnodes, bdi, &shadow_map_aops);
+ mi->mi_shadow = shadow;
+ return 0;
+}
+
+/**
+ * nilfs_mdt_save_to_shadow_map - copy bmap and dirty pages to shadow map
+ * @inode: inode of the metadata file
+ */
+int nilfs_mdt_save_to_shadow_map(struct inode *inode)
+{
+ struct nilfs_mdt_info *mi = NILFS_MDT(inode);
+ struct nilfs_inode_info *ii = NILFS_I(inode);
+ struct nilfs_shadow_map *shadow = mi->mi_shadow;
+ int ret;
+
+ ret = nilfs_copy_dirty_pages(&shadow->frozen_data, inode->i_mapping);
+ if (ret)
+ goto out;
+
+ ret = nilfs_copy_dirty_pages(&shadow->frozen_btnodes,
+ &ii->i_btnode_cache);
+ if (ret)
+ goto out;
+
+ nilfs_bmap_save(ii->i_bmap, &shadow->bmap_store);
+ out:
+ return ret;
+}
+
+/**
+ * nilfs_mdt_restore_from_shadow_map - restore dirty pages and bmap state
+ * @inode: inode of the metadata file
+ */
+void nilfs_mdt_restore_from_shadow_map(struct inode *inode)
+{
+ struct nilfs_mdt_info *mi = NILFS_MDT(inode);
+ struct nilfs_inode_info *ii = NILFS_I(inode);
+ struct nilfs_shadow_map *shadow = mi->mi_shadow;
+
+ down_write(&mi->mi_sem);
+
+ if (mi->mi_palloc_cache)
+ nilfs_palloc_clear_cache(inode);
+
+ nilfs_clear_dirty_pages(inode->i_mapping);
+ nilfs_copy_back_pages(inode->i_mapping, &shadow->frozen_data);
+
+ nilfs_clear_dirty_pages(&ii->i_btnode_cache);
+ nilfs_copy_back_pages(&ii->i_btnode_cache, &shadow->frozen_btnodes);
+
+ nilfs_bmap_restore(ii->i_bmap, &shadow->bmap_store);
+
+ up_write(&mi->mi_sem);
+}
+
+/**
+ * nilfs_mdt_clear_shadow_map - truncate pages in shadow map caches
+ * @inode: inode of the metadata file
+ */
+void nilfs_mdt_clear_shadow_map(struct inode *inode)
+{
+ struct nilfs_mdt_info *mi = NILFS_MDT(inode);
+ struct nilfs_shadow_map *shadow = mi->mi_shadow;
+
+ down_write(&mi->mi_sem);
+ truncate_inode_pages(&shadow->frozen_data, 0);
+ truncate_inode_pages(&shadow->frozen_btnodes, 0);
+ up_write(&mi->mi_sem);
+}
+
static void nilfs_mdt_clear(struct inode *inode)
{
struct nilfs_inode_info *ii = NILFS_I(inode);
nilfs_palloc_destroy_cache(inode);
nilfs_mdt_clear(inode);
- kfree(mdi->mi_bgl); /* kfree(NULL) is safe */
- kfree(mdi);
nilfs_destroy_inode(inode);
}
projects / deliverable / linux.git / blobdiff