| /* |
| * f2fs extent cache support |
| * |
| * Copyright (c) 2015 Motorola Mobility |
| * Copyright (c) 2015 Samsung Electronics |
| * Authors: Jaegeuk Kim <jaegeuk@kernel.org> |
| * Chao Yu <chao2.yu@samsung.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/fs.h> |
| #include <linux/f2fs_fs.h> |
| |
| #include "f2fs.h" |
| #include "node.h" |
| #include <trace/events/f2fs.h> |
| |
| static struct kmem_cache *extent_tree_slab; |
| static struct kmem_cache *extent_node_slab; |
| |
| static struct extent_node *__attach_extent_node(struct f2fs_sb_info *sbi, |
| struct extent_tree *et, struct extent_info *ei, |
| struct rb_node *parent, struct rb_node **p) |
| { |
| struct extent_node *en; |
| |
| en = kmem_cache_alloc(extent_node_slab, GFP_ATOMIC); |
| if (!en) |
| return NULL; |
| |
| en->ei = *ei; |
| INIT_LIST_HEAD(&en->list); |
| en->et = et; |
| |
| rb_link_node(&en->rb_node, parent, p); |
| rb_insert_color(&en->rb_node, &et->root); |
| atomic_inc(&et->node_cnt); |
| atomic_inc(&sbi->total_ext_node); |
| return en; |
| } |
| |
| static void __detach_extent_node(struct f2fs_sb_info *sbi, |
| struct extent_tree *et, struct extent_node *en) |
| { |
| rb_erase(&en->rb_node, &et->root); |
| atomic_dec(&et->node_cnt); |
| atomic_dec(&sbi->total_ext_node); |
| |
| if (et->cached_en == en) |
| et->cached_en = NULL; |
| kmem_cache_free(extent_node_slab, en); |
| } |
| |
| /* |
| * Flow to release an extent_node: |
| * 1. list_del_init |
| * 2. __detach_extent_node |
| * 3. kmem_cache_free. |
| */ |
| static void __release_extent_node(struct f2fs_sb_info *sbi, |
| struct extent_tree *et, struct extent_node *en) |
| { |
| spin_lock(&sbi->extent_lock); |
| f2fs_bug_on(sbi, list_empty(&en->list)); |
| list_del_init(&en->list); |
| spin_unlock(&sbi->extent_lock); |
| |
| __detach_extent_node(sbi, et, en); |
| } |
| |
| static struct extent_tree *__grab_extent_tree(struct inode *inode) |
| { |
| struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
| struct extent_tree *et; |
| nid_t ino = inode->i_ino; |
| |
| down_write(&sbi->extent_tree_lock); |
| et = radix_tree_lookup(&sbi->extent_tree_root, ino); |
| if (!et) { |
| et = f2fs_kmem_cache_alloc(extent_tree_slab, GFP_NOFS); |
| f2fs_radix_tree_insert(&sbi->extent_tree_root, ino, et); |
| memset(et, 0, sizeof(struct extent_tree)); |
| et->ino = ino; |
| et->root = RB_ROOT; |
| et->cached_en = NULL; |
| rwlock_init(&et->lock); |
| INIT_LIST_HEAD(&et->list); |
| atomic_set(&et->node_cnt, 0); |
| atomic_inc(&sbi->total_ext_tree); |
| } else { |
| atomic_dec(&sbi->total_zombie_tree); |
| list_del_init(&et->list); |
| } |
| up_write(&sbi->extent_tree_lock); |
| |
| /* never died until evict_inode */ |
| F2FS_I(inode)->extent_tree = et; |
| |
| return et; |
| } |
| |
| static struct extent_node *__lookup_extent_tree(struct f2fs_sb_info *sbi, |
| struct extent_tree *et, unsigned int fofs) |
| { |
| struct rb_node *node = et->root.rb_node; |
| struct extent_node *en = et->cached_en; |
| |
| if (en) { |
| struct extent_info *cei = &en->ei; |
| |
| if (cei->fofs <= fofs && cei->fofs + cei->len > fofs) { |
| stat_inc_cached_node_hit(sbi); |
| return en; |
| } |
| } |
| |
| while (node) { |
| en = rb_entry(node, struct extent_node, rb_node); |
| |
| if (fofs < en->ei.fofs) { |
| node = node->rb_left; |
| } else if (fofs >= en->ei.fofs + en->ei.len) { |
| node = node->rb_right; |
| } else { |
| stat_inc_rbtree_node_hit(sbi); |
| return en; |
| } |
| } |
| return NULL; |
| } |
| |
| static struct extent_node *__init_extent_tree(struct f2fs_sb_info *sbi, |
| struct extent_tree *et, struct extent_info *ei) |
| { |
| struct rb_node **p = &et->root.rb_node; |
| struct extent_node *en; |
| |
| en = __attach_extent_node(sbi, et, ei, NULL, p); |
| if (!en) |
| return NULL; |
| |
| et->largest = en->ei; |
| et->cached_en = en; |
| return en; |
| } |
| |
| static unsigned int __free_extent_tree(struct f2fs_sb_info *sbi, |
| struct extent_tree *et) |
| { |
| struct rb_node *node, *next; |
| struct extent_node *en; |
| unsigned int count = atomic_read(&et->node_cnt); |
| |
| node = rb_first(&et->root); |
| while (node) { |
| next = rb_next(node); |
| en = rb_entry(node, struct extent_node, rb_node); |
| __release_extent_node(sbi, et, en); |
| node = next; |
| } |
| |
| return count - atomic_read(&et->node_cnt); |
| } |
| |
| static void __drop_largest_extent(struct inode *inode, |
| pgoff_t fofs, unsigned int len) |
| { |
| struct extent_info *largest = &F2FS_I(inode)->extent_tree->largest; |
| |
| if (fofs < largest->fofs + largest->len && fofs + len > largest->fofs) |
| largest->len = 0; |
| } |
| |
| /* return true, if inode page is changed */ |
| bool f2fs_init_extent_tree(struct inode *inode, struct f2fs_extent *i_ext) |
| { |
| struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
| struct extent_tree *et; |
| struct extent_node *en; |
| struct extent_info ei; |
| |
| if (!f2fs_may_extent_tree(inode)) { |
| /* drop largest extent */ |
| if (i_ext && i_ext->len) { |
| i_ext->len = 0; |
| return true; |
| } |
| return false; |
| } |
| |
| et = __grab_extent_tree(inode); |
| |
| if (!i_ext || !i_ext->len) |
| return false; |
| |
| set_extent_info(&ei, le32_to_cpu(i_ext->fofs), |
| le32_to_cpu(i_ext->blk), le32_to_cpu(i_ext->len)); |
| |
| write_lock(&et->lock); |
| if (atomic_read(&et->node_cnt)) |
| goto out; |
| |
| en = __init_extent_tree(sbi, et, &ei); |
| if (en) { |
| spin_lock(&sbi->extent_lock); |
| list_add_tail(&en->list, &sbi->extent_list); |
| spin_unlock(&sbi->extent_lock); |
| } |
| out: |
| write_unlock(&et->lock); |
| return false; |
| } |
| |
| static bool f2fs_lookup_extent_tree(struct inode *inode, pgoff_t pgofs, |
| struct extent_info *ei) |
| { |
| struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
| struct extent_tree *et = F2FS_I(inode)->extent_tree; |
| struct extent_node *en; |
| bool ret = false; |
| |
| f2fs_bug_on(sbi, !et); |
| |
| trace_f2fs_lookup_extent_tree_start(inode, pgofs); |
| |
| read_lock(&et->lock); |
| |
| if (et->largest.fofs <= pgofs && |
| et->largest.fofs + et->largest.len > pgofs) { |
| *ei = et->largest; |
| ret = true; |
| stat_inc_largest_node_hit(sbi); |
| goto out; |
| } |
| |
| en = __lookup_extent_tree(sbi, et, pgofs); |
| if (en) { |
| *ei = en->ei; |
| spin_lock(&sbi->extent_lock); |
| if (!list_empty(&en->list)) { |
| list_move_tail(&en->list, &sbi->extent_list); |
| et->cached_en = en; |
| } |
| spin_unlock(&sbi->extent_lock); |
| ret = true; |
| } |
| out: |
| stat_inc_total_hit(sbi); |
| read_unlock(&et->lock); |
| |
| trace_f2fs_lookup_extent_tree_end(inode, pgofs, ei); |
| return ret; |
| } |
| |
| |
| /* |
| * lookup extent at @fofs, if hit, return the extent |
| * if not, return NULL and |
| * @prev_ex: extent before fofs |
| * @next_ex: extent after fofs |
| * @insert_p: insert point for new extent at fofs |
| * in order to simpfy the insertion after. |
| * tree must stay unchanged between lookup and insertion. |
| */ |
| static struct extent_node *__lookup_extent_tree_ret(struct extent_tree *et, |
| unsigned int fofs, |
| struct extent_node **prev_ex, |
| struct extent_node **next_ex, |
| struct rb_node ***insert_p, |
| struct rb_node **insert_parent) |
| { |
| struct rb_node **pnode = &et->root.rb_node; |
| struct rb_node *parent = NULL, *tmp_node; |
| struct extent_node *en = et->cached_en; |
| |
| *insert_p = NULL; |
| *insert_parent = NULL; |
| *prev_ex = NULL; |
| *next_ex = NULL; |
| |
| if (RB_EMPTY_ROOT(&et->root)) |
| return NULL; |
| |
| if (en) { |
| struct extent_info *cei = &en->ei; |
| |
| if (cei->fofs <= fofs && cei->fofs + cei->len > fofs) |
| goto lookup_neighbors; |
| } |
| |
| while (*pnode) { |
| parent = *pnode; |
| en = rb_entry(*pnode, struct extent_node, rb_node); |
| |
| if (fofs < en->ei.fofs) |
| pnode = &(*pnode)->rb_left; |
| else if (fofs >= en->ei.fofs + en->ei.len) |
| pnode = &(*pnode)->rb_right; |
| else |
| goto lookup_neighbors; |
| } |
| |
| *insert_p = pnode; |
| *insert_parent = parent; |
| |
| en = rb_entry(parent, struct extent_node, rb_node); |
| tmp_node = parent; |
| if (parent && fofs > en->ei.fofs) |
| tmp_node = rb_next(parent); |
| *next_ex = tmp_node ? |
| rb_entry(tmp_node, struct extent_node, rb_node) : NULL; |
| |
| tmp_node = parent; |
| if (parent && fofs < en->ei.fofs) |
| tmp_node = rb_prev(parent); |
| *prev_ex = tmp_node ? |
| rb_entry(tmp_node, struct extent_node, rb_node) : NULL; |
| return NULL; |
| |
| lookup_neighbors: |
| if (fofs == en->ei.fofs) { |
| /* lookup prev node for merging backward later */ |
| tmp_node = rb_prev(&en->rb_node); |
| *prev_ex = tmp_node ? |
| rb_entry(tmp_node, struct extent_node, rb_node) : NULL; |
| } |
| if (fofs == en->ei.fofs + en->ei.len - 1) { |
| /* lookup next node for merging frontward later */ |
| tmp_node = rb_next(&en->rb_node); |
| *next_ex = tmp_node ? |
| rb_entry(tmp_node, struct extent_node, rb_node) : NULL; |
| } |
| return en; |
| } |
| |
| static struct extent_node *__try_merge_extent_node(struct f2fs_sb_info *sbi, |
| struct extent_tree *et, struct extent_info *ei, |
| struct extent_node *prev_ex, |
| struct extent_node *next_ex) |
| { |
| struct extent_node *en = NULL; |
| |
| if (prev_ex && __is_back_mergeable(ei, &prev_ex->ei)) { |
| prev_ex->ei.len += ei->len; |
| ei = &prev_ex->ei; |
| en = prev_ex; |
| } |
| |
| if (next_ex && __is_front_mergeable(ei, &next_ex->ei)) { |
| if (en) |
| __release_extent_node(sbi, et, prev_ex); |
| next_ex->ei.fofs = ei->fofs; |
| next_ex->ei.blk = ei->blk; |
| next_ex->ei.len += ei->len; |
| en = next_ex; |
| } |
| |
| if (!en) |
| return NULL; |
| |
| __try_update_largest_extent(et, en); |
| |
| spin_lock(&sbi->extent_lock); |
| if (!list_empty(&en->list)) { |
| list_move_tail(&en->list, &sbi->extent_list); |
| et->cached_en = en; |
| } |
| spin_unlock(&sbi->extent_lock); |
| return en; |
| } |
| |
| static struct extent_node *__insert_extent_tree(struct f2fs_sb_info *sbi, |
| struct extent_tree *et, struct extent_info *ei, |
| struct rb_node **insert_p, |
| struct rb_node *insert_parent) |
| { |
| struct rb_node **p = &et->root.rb_node; |
| struct rb_node *parent = NULL; |
| struct extent_node *en = NULL; |
| |
| if (insert_p && insert_parent) { |
| parent = insert_parent; |
| p = insert_p; |
| goto do_insert; |
| } |
| |
| while (*p) { |
| parent = *p; |
| en = rb_entry(parent, struct extent_node, rb_node); |
| |
| if (ei->fofs < en->ei.fofs) |
| p = &(*p)->rb_left; |
| else if (ei->fofs >= en->ei.fofs + en->ei.len) |
| p = &(*p)->rb_right; |
| else |
| f2fs_bug_on(sbi, 1); |
| } |
| do_insert: |
| en = __attach_extent_node(sbi, et, ei, parent, p); |
| if (!en) |
| return NULL; |
| |
| __try_update_largest_extent(et, en); |
| |
| /* update in global extent list */ |
| spin_lock(&sbi->extent_lock); |
| list_add_tail(&en->list, &sbi->extent_list); |
| et->cached_en = en; |
| spin_unlock(&sbi->extent_lock); |
| return en; |
| } |
| |
| static unsigned int f2fs_update_extent_tree_range(struct inode *inode, |
| pgoff_t fofs, block_t blkaddr, unsigned int len) |
| { |
| struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
| struct extent_tree *et = F2FS_I(inode)->extent_tree; |
| struct extent_node *en = NULL, *en1 = NULL; |
| struct extent_node *prev_en = NULL, *next_en = NULL; |
| struct extent_info ei, dei, prev; |
| struct rb_node **insert_p = NULL, *insert_parent = NULL; |
| unsigned int end = fofs + len; |
| unsigned int pos = (unsigned int)fofs; |
| |
| if (!et) |
| return false; |
| |
| trace_f2fs_update_extent_tree_range(inode, fofs, blkaddr, len); |
| |
| write_lock(&et->lock); |
| |
| if (is_inode_flag_set(F2FS_I(inode), FI_NO_EXTENT)) { |
| write_unlock(&et->lock); |
| return false; |
| } |
| |
| prev = et->largest; |
| dei.len = 0; |
| |
| /* |
| * drop largest extent before lookup, in case it's already |
| * been shrunk from extent tree |
| */ |
| __drop_largest_extent(inode, fofs, len); |
| |
| /* 1. lookup first extent node in range [fofs, fofs + len - 1] */ |
| en = __lookup_extent_tree_ret(et, fofs, &prev_en, &next_en, |
| &insert_p, &insert_parent); |
| if (!en) |
| en = next_en; |
| |
| /* 2. invlidate all extent nodes in range [fofs, fofs + len - 1] */ |
| while (en && en->ei.fofs < end) { |
| unsigned int org_end; |
| int parts = 0; /* # of parts current extent split into */ |
| |
| next_en = en1 = NULL; |
| |
| dei = en->ei; |
| org_end = dei.fofs + dei.len; |
| f2fs_bug_on(sbi, pos >= org_end); |
| |
| if (pos > dei.fofs && pos - dei.fofs >= F2FS_MIN_EXTENT_LEN) { |
| en->ei.len = pos - en->ei.fofs; |
| prev_en = en; |
| parts = 1; |
| } |
| |
| if (end < org_end && org_end - end >= F2FS_MIN_EXTENT_LEN) { |
| if (parts) { |
| set_extent_info(&ei, end, |
| end - dei.fofs + dei.blk, |
| org_end - end); |
| en1 = __insert_extent_tree(sbi, et, &ei, |
| NULL, NULL); |
| next_en = en1; |
| } else { |
| en->ei.fofs = end; |
| en->ei.blk += end - dei.fofs; |
| en->ei.len -= end - dei.fofs; |
| next_en = en; |
| } |
| parts++; |
| } |
| |
| if (!next_en) { |
| struct rb_node *node = rb_next(&en->rb_node); |
| |
| next_en = node ? |
| rb_entry(node, struct extent_node, rb_node) |
| : NULL; |
| } |
| |
| if (parts) |
| __try_update_largest_extent(et, en); |
| else |
| __release_extent_node(sbi, et, en); |
| |
| /* |
| * if original extent is split into zero or two parts, extent |
| * tree has been altered by deletion or insertion, therefore |
| * invalidate pointers regard to tree. |
| */ |
| if (parts != 1) { |
| insert_p = NULL; |
| insert_parent = NULL; |
| } |
| en = next_en; |
| } |
| |
| /* 3. update extent in extent cache */ |
| if (blkaddr) { |
| |
| set_extent_info(&ei, fofs, blkaddr, len); |
| if (!__try_merge_extent_node(sbi, et, &ei, prev_en, next_en)) |
| __insert_extent_tree(sbi, et, &ei, |
| insert_p, insert_parent); |
| |
| /* give up extent_cache, if split and small updates happen */ |
| if (dei.len >= 1 && |
| prev.len < F2FS_MIN_EXTENT_LEN && |
| et->largest.len < F2FS_MIN_EXTENT_LEN) { |
| et->largest.len = 0; |
| set_inode_flag(F2FS_I(inode), FI_NO_EXTENT); |
| } |
| } |
| |
| if (is_inode_flag_set(F2FS_I(inode), FI_NO_EXTENT)) |
| __free_extent_tree(sbi, et); |
| |
| write_unlock(&et->lock); |
| |
| return !__is_extent_same(&prev, &et->largest); |
| } |
| |
| unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink) |
| { |
| struct extent_tree *et, *next; |
| struct extent_node *en; |
| unsigned int node_cnt = 0, tree_cnt = 0; |
| int remained; |
| |
| if (!test_opt(sbi, EXTENT_CACHE)) |
| return 0; |
| |
| if (!atomic_read(&sbi->total_zombie_tree)) |
| goto free_node; |
| |
| if (!down_write_trylock(&sbi->extent_tree_lock)) |
| goto out; |
| |
| /* 1. remove unreferenced extent tree */ |
| list_for_each_entry_safe(et, next, &sbi->zombie_list, list) { |
| if (atomic_read(&et->node_cnt)) { |
| write_lock(&et->lock); |
| node_cnt += __free_extent_tree(sbi, et); |
| write_unlock(&et->lock); |
| } |
| f2fs_bug_on(sbi, atomic_read(&et->node_cnt)); |
| list_del_init(&et->list); |
| radix_tree_delete(&sbi->extent_tree_root, et->ino); |
| kmem_cache_free(extent_tree_slab, et); |
| atomic_dec(&sbi->total_ext_tree); |
| atomic_dec(&sbi->total_zombie_tree); |
| tree_cnt++; |
| |
| if (node_cnt + tree_cnt >= nr_shrink) |
| goto unlock_out; |
| } |
| up_write(&sbi->extent_tree_lock); |
| |
| free_node: |
| /* 2. remove LRU extent entries */ |
| if (!down_write_trylock(&sbi->extent_tree_lock)) |
| goto out; |
| |
| remained = nr_shrink - (node_cnt + tree_cnt); |
| |
| spin_lock(&sbi->extent_lock); |
| for (; remained > 0; remained--) { |
| if (list_empty(&sbi->extent_list)) |
| break; |
| en = list_first_entry(&sbi->extent_list, |
| struct extent_node, list); |
| et = en->et; |
| if (!write_trylock(&et->lock)) { |
| /* refresh this extent node's position in extent list */ |
| list_move_tail(&en->list, &sbi->extent_list); |
| continue; |
| } |
| |
| list_del_init(&en->list); |
| spin_unlock(&sbi->extent_lock); |
| |
| __detach_extent_node(sbi, et, en); |
| |
| write_unlock(&et->lock); |
| node_cnt++; |
| spin_lock(&sbi->extent_lock); |
| } |
| spin_unlock(&sbi->extent_lock); |
| |
| unlock_out: |
| up_write(&sbi->extent_tree_lock); |
| out: |
| trace_f2fs_shrink_extent_tree(sbi, node_cnt, tree_cnt); |
| |
| return node_cnt + tree_cnt; |
| } |
| |
| unsigned int f2fs_destroy_extent_node(struct inode *inode) |
| { |
| struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
| struct extent_tree *et = F2FS_I(inode)->extent_tree; |
| unsigned int node_cnt = 0; |
| |
| if (!et || !atomic_read(&et->node_cnt)) |
| return 0; |
| |
| write_lock(&et->lock); |
| node_cnt = __free_extent_tree(sbi, et); |
| write_unlock(&et->lock); |
| |
| return node_cnt; |
| } |
| |
| void f2fs_destroy_extent_tree(struct inode *inode) |
| { |
| struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
| struct extent_tree *et = F2FS_I(inode)->extent_tree; |
| unsigned int node_cnt = 0; |
| |
| if (!et) |
| return; |
| |
| if (inode->i_nlink && !is_bad_inode(inode) && |
| atomic_read(&et->node_cnt)) { |
| down_write(&sbi->extent_tree_lock); |
| list_add_tail(&et->list, &sbi->zombie_list); |
| atomic_inc(&sbi->total_zombie_tree); |
| up_write(&sbi->extent_tree_lock); |
| return; |
| } |
| |
| /* free all extent info belong to this extent tree */ |
| node_cnt = f2fs_destroy_extent_node(inode); |
| |
| /* delete extent tree entry in radix tree */ |
| down_write(&sbi->extent_tree_lock); |
| f2fs_bug_on(sbi, atomic_read(&et->node_cnt)); |
| radix_tree_delete(&sbi->extent_tree_root, inode->i_ino); |
| kmem_cache_free(extent_tree_slab, et); |
| atomic_dec(&sbi->total_ext_tree); |
| up_write(&sbi->extent_tree_lock); |
| |
| F2FS_I(inode)->extent_tree = NULL; |
| |
| trace_f2fs_destroy_extent_tree(inode, node_cnt); |
| } |
| |
| bool f2fs_lookup_extent_cache(struct inode *inode, pgoff_t pgofs, |
| struct extent_info *ei) |
| { |
| if (!f2fs_may_extent_tree(inode)) |
| return false; |
| |
| return f2fs_lookup_extent_tree(inode, pgofs, ei); |
| } |
| |
| void f2fs_update_extent_cache(struct dnode_of_data *dn) |
| { |
| struct f2fs_inode_info *fi = F2FS_I(dn->inode); |
| pgoff_t fofs; |
| |
| if (!f2fs_may_extent_tree(dn->inode)) |
| return; |
| |
| f2fs_bug_on(F2FS_I_SB(dn->inode), dn->data_blkaddr == NEW_ADDR); |
| |
| |
| fofs = start_bidx_of_node(ofs_of_node(dn->node_page), fi) + |
| dn->ofs_in_node; |
| |
| if (f2fs_update_extent_tree_range(dn->inode, fofs, dn->data_blkaddr, 1)) |
| sync_inode_page(dn); |
| } |
| |
| void f2fs_update_extent_cache_range(struct dnode_of_data *dn, |
| pgoff_t fofs, block_t blkaddr, unsigned int len) |
| |
| { |
| if (!f2fs_may_extent_tree(dn->inode)) |
| return; |
| |
| if (f2fs_update_extent_tree_range(dn->inode, fofs, blkaddr, len)) |
| sync_inode_page(dn); |
| } |
| |
| void init_extent_cache_info(struct f2fs_sb_info *sbi) |
| { |
| INIT_RADIX_TREE(&sbi->extent_tree_root, GFP_NOIO); |
| init_rwsem(&sbi->extent_tree_lock); |
| INIT_LIST_HEAD(&sbi->extent_list); |
| spin_lock_init(&sbi->extent_lock); |
| atomic_set(&sbi->total_ext_tree, 0); |
| INIT_LIST_HEAD(&sbi->zombie_list); |
| atomic_set(&sbi->total_zombie_tree, 0); |
| atomic_set(&sbi->total_ext_node, 0); |
| } |
| |
| int __init create_extent_cache(void) |
| { |
| extent_tree_slab = f2fs_kmem_cache_create("f2fs_extent_tree", |
| sizeof(struct extent_tree)); |
| if (!extent_tree_slab) |
| return -ENOMEM; |
| extent_node_slab = f2fs_kmem_cache_create("f2fs_extent_node", |
| sizeof(struct extent_node)); |
| if (!extent_node_slab) { |
| kmem_cache_destroy(extent_tree_slab); |
| return -ENOMEM; |
| } |
| return 0; |
| } |
| |
| void destroy_extent_cache(void) |
| { |
| kmem_cache_destroy(extent_node_slab); |
| kmem_cache_destroy(extent_tree_slab); |
| } |