diff options
Diffstat (limited to 'fs/f2fs/extent_cache.c')
| -rw-r--r-- | fs/f2fs/extent_cache.c | 1061 |
1 files changed, 1061 insertions, 0 deletions
diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c new file mode 100644 index 000000000..16692c96e --- /dev/null +++ b/fs/f2fs/extent_cache.c @@ -0,0 +1,1061 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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> + */ + +#include <linux/fs.h> +#include <linux/f2fs_fs.h> + +#include "f2fs.h" +#include "node.h" +#include <trace/events/f2fs.h> + +bool sanity_check_extent_cache(struct inode *inode) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); + struct f2fs_inode_info *fi = F2FS_I(inode); + struct extent_info *ei; + + if (!fi->extent_tree[EX_READ]) + return true; + + ei = &fi->extent_tree[EX_READ]->largest; + + if (ei->len && + (!f2fs_is_valid_blkaddr(sbi, ei->blk, + DATA_GENERIC_ENHANCE) || + !f2fs_is_valid_blkaddr(sbi, ei->blk + ei->len - 1, + DATA_GENERIC_ENHANCE))) { + set_sbi_flag(sbi, SBI_NEED_FSCK); + f2fs_warn(sbi, "%s: inode (ino=%lx) extent info [%u, %u, %u] is incorrect, run fsck to fix", + __func__, inode->i_ino, + ei->blk, ei->fofs, ei->len); + return false; + } + return true; +} + +static void __set_extent_info(struct extent_info *ei, + unsigned int fofs, unsigned int len, + block_t blk, bool keep_clen, + enum extent_type type) +{ + ei->fofs = fofs; + ei->len = len; + + if (type == EX_READ) { + ei->blk = blk; + if (keep_clen) + return; +#ifdef CONFIG_F2FS_FS_COMPRESSION + ei->c_len = 0; +#endif + } +} + +static bool __may_read_extent_tree(struct inode *inode) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); + + if (!test_opt(sbi, READ_EXTENT_CACHE)) + return false; + if (is_inode_flag_set(inode, FI_NO_EXTENT)) + return false; + if (is_inode_flag_set(inode, FI_COMPRESSED_FILE) && + !f2fs_sb_has_readonly(sbi)) + return false; + return S_ISREG(inode->i_mode); +} + +static bool __init_may_extent_tree(struct inode *inode, enum extent_type type) +{ + if (type == EX_READ) + return __may_read_extent_tree(inode); + return false; +} + +static bool __may_extent_tree(struct inode *inode, enum extent_type type) +{ + /* + * for recovered files during mount do not create extents + * if shrinker is not registered. + */ + if (list_empty(&F2FS_I_SB(inode)->s_list)) + return false; + + return __init_may_extent_tree(inode, type); +} + +static void __try_update_largest_extent(struct extent_tree *et, + struct extent_node *en) +{ + if (et->type != EX_READ) + return; + if (en->ei.len <= et->largest.len) + return; + + et->largest = en->ei; + et->largest_updated = true; +} + +static bool __is_extent_mergeable(struct extent_info *back, + struct extent_info *front, enum extent_type type) +{ + if (type == EX_READ) { +#ifdef CONFIG_F2FS_FS_COMPRESSION + if (back->c_len && back->len != back->c_len) + return false; + if (front->c_len && front->len != front->c_len) + return false; +#endif + return (back->fofs + back->len == front->fofs && + back->blk + back->len == front->blk); + } + return false; +} + +static bool __is_back_mergeable(struct extent_info *cur, + struct extent_info *back, enum extent_type type) +{ + return __is_extent_mergeable(back, cur, type); +} + +static bool __is_front_mergeable(struct extent_info *cur, + struct extent_info *front, enum extent_type type) +{ + return __is_extent_mergeable(cur, front, type); +} + +static struct rb_entry *__lookup_rb_tree_fast(struct rb_entry *cached_re, + unsigned int ofs) +{ + if (cached_re) { + if (cached_re->ofs <= ofs && + cached_re->ofs + cached_re->len > ofs) { + return cached_re; + } + } + return NULL; +} + +static struct rb_entry *__lookup_rb_tree_slow(struct rb_root_cached *root, + unsigned int ofs) +{ + struct rb_node *node = root->rb_root.rb_node; + struct rb_entry *re; + + while (node) { + re = rb_entry(node, struct rb_entry, rb_node); + + if (ofs < re->ofs) + node = node->rb_left; + else if (ofs >= re->ofs + re->len) + node = node->rb_right; + else + return re; + } + return NULL; +} + +struct rb_entry *f2fs_lookup_rb_tree(struct rb_root_cached *root, + struct rb_entry *cached_re, unsigned int ofs) +{ + struct rb_entry *re; + + re = __lookup_rb_tree_fast(cached_re, ofs); + if (!re) + return __lookup_rb_tree_slow(root, ofs); + + return re; +} + +struct rb_node **f2fs_lookup_rb_tree_for_insert(struct f2fs_sb_info *sbi, + struct rb_root_cached *root, + struct rb_node **parent, + unsigned int ofs, bool *leftmost) +{ + struct rb_node **p = &root->rb_root.rb_node; + struct rb_entry *re; + + while (*p) { + *parent = *p; + re = rb_entry(*parent, struct rb_entry, rb_node); + + if (ofs < re->ofs) { + p = &(*p)->rb_left; + } else if (ofs >= re->ofs + re->len) { + p = &(*p)->rb_right; + *leftmost = false; + } else { + f2fs_bug_on(sbi, 1); + } + } + + return p; +} + +/* + * lookup rb entry in position of @ofs in rb-tree, + * if hit, return the entry, otherwise, return NULL + * @prev_ex: extent before ofs + * @next_ex: extent after ofs + * @insert_p: insert point for new extent at ofs + * in order to simpfy the insertion after. + * tree must stay unchanged between lookup and insertion. + */ +struct rb_entry *f2fs_lookup_rb_tree_ret(struct rb_root_cached *root, + struct rb_entry *cached_re, + unsigned int ofs, + struct rb_entry **prev_entry, + struct rb_entry **next_entry, + struct rb_node ***insert_p, + struct rb_node **insert_parent, + bool force, bool *leftmost) +{ + struct rb_node **pnode = &root->rb_root.rb_node; + struct rb_node *parent = NULL, *tmp_node; + struct rb_entry *re = cached_re; + + *insert_p = NULL; + *insert_parent = NULL; + *prev_entry = NULL; + *next_entry = NULL; + + if (RB_EMPTY_ROOT(&root->rb_root)) + return NULL; + + if (re) { + if (re->ofs <= ofs && re->ofs + re->len > ofs) + goto lookup_neighbors; + } + + if (leftmost) + *leftmost = true; + + while (*pnode) { + parent = *pnode; + re = rb_entry(*pnode, struct rb_entry, rb_node); + + if (ofs < re->ofs) { + pnode = &(*pnode)->rb_left; + } else if (ofs >= re->ofs + re->len) { + pnode = &(*pnode)->rb_right; + if (leftmost) + *leftmost = false; + } else { + goto lookup_neighbors; + } + } + + *insert_p = pnode; + *insert_parent = parent; + + re = rb_entry(parent, struct rb_entry, rb_node); + tmp_node = parent; + if (parent && ofs > re->ofs) + tmp_node = rb_next(parent); + *next_entry = rb_entry_safe(tmp_node, struct rb_entry, rb_node); + + tmp_node = parent; + if (parent && ofs < re->ofs) + tmp_node = rb_prev(parent); + *prev_entry = rb_entry_safe(tmp_node, struct rb_entry, rb_node); + return NULL; + +lookup_neighbors: + if (ofs == re->ofs || force) { + /* lookup prev node for merging backward later */ + tmp_node = rb_prev(&re->rb_node); + *prev_entry = rb_entry_safe(tmp_node, struct rb_entry, rb_node); + } + if (ofs == re->ofs + re->len - 1 || force) { + /* lookup next node for merging frontward later */ + tmp_node = rb_next(&re->rb_node); + *next_entry = rb_entry_safe(tmp_node, struct rb_entry, rb_node); + } + return re; +} + +bool f2fs_check_rb_tree_consistence(struct f2fs_sb_info *sbi, + struct rb_root_cached *root) +{ +#ifdef CONFIG_F2FS_CHECK_FS + struct rb_node *cur = rb_first_cached(root), *next; + struct rb_entry *cur_re, *next_re; + + if (!cur) + return true; + + while (cur) { + next = rb_next(cur); + if (!next) + return true; + + cur_re = rb_entry(cur, struct rb_entry, rb_node); + next_re = rb_entry(next, struct rb_entry, rb_node); + + if (cur_re->ofs + cur_re->len > next_re->ofs) { + f2fs_info(sbi, "inconsistent rbtree, cur(%u, %u) next(%u, %u)", + cur_re->ofs, cur_re->len, + next_re->ofs, next_re->len); + return false; + } + cur = next; + } +#endif + return true; +} + +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, + bool leftmost) +{ + struct extent_tree_info *eti = &sbi->extent_tree[et->type]; + struct extent_node *en; + + en = f2fs_kmem_cache_alloc(extent_node_slab, GFP_ATOMIC, false, sbi); + 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_cached(&en->rb_node, &et->root, leftmost); + atomic_inc(&et->node_cnt); + atomic_inc(&eti->total_ext_node); + return en; +} + +static void __detach_extent_node(struct f2fs_sb_info *sbi, + struct extent_tree *et, struct extent_node *en) +{ + struct extent_tree_info *eti = &sbi->extent_tree[et->type]; + + rb_erase_cached(&en->rb_node, &et->root); + atomic_dec(&et->node_cnt); + atomic_dec(&eti->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) +{ + struct extent_tree_info *eti = &sbi->extent_tree[et->type]; + + spin_lock(&eti->extent_lock); + f2fs_bug_on(sbi, list_empty(&en->list)); + list_del_init(&en->list); + spin_unlock(&eti->extent_lock); + + __detach_extent_node(sbi, et, en); +} + +static struct extent_tree *__grab_extent_tree(struct inode *inode, + enum extent_type type) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); + struct extent_tree_info *eti = &sbi->extent_tree[type]; + struct extent_tree *et; + nid_t ino = inode->i_ino; + + mutex_lock(&eti->extent_tree_lock); + et = radix_tree_lookup(&eti->extent_tree_root, ino); + if (!et) { + et = f2fs_kmem_cache_alloc(extent_tree_slab, + GFP_NOFS, true, NULL); + f2fs_radix_tree_insert(&eti->extent_tree_root, ino, et); + memset(et, 0, sizeof(struct extent_tree)); + et->ino = ino; + et->type = type; + et->root = RB_ROOT_CACHED; + et->cached_en = NULL; + rwlock_init(&et->lock); + INIT_LIST_HEAD(&et->list); + atomic_set(&et->node_cnt, 0); + atomic_inc(&eti->total_ext_tree); + } else { + atomic_dec(&eti->total_zombie_tree); + list_del_init(&et->list); + } + mutex_unlock(&eti->extent_tree_lock); + + /* never died until evict_inode */ + F2FS_I(inode)->extent_tree[type] = et; + + return et; +} + +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_cached(&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 extent_tree *et, + pgoff_t fofs, unsigned int len) +{ + if (fofs < et->largest.fofs + et->largest.len && + fofs + len > et->largest.fofs) { + et->largest.len = 0; + et->largest_updated = true; + } +} + +void f2fs_init_read_extent_tree(struct inode *inode, struct page *ipage) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); + struct extent_tree_info *eti = &sbi->extent_tree[EX_READ]; + struct f2fs_extent *i_ext = &F2FS_INODE(ipage)->i_ext; + struct extent_tree *et; + struct extent_node *en; + struct extent_info ei; + + if (!__may_extent_tree(inode, EX_READ)) { + /* drop largest read extent */ + if (i_ext && i_ext->len) { + f2fs_wait_on_page_writeback(ipage, NODE, true, true); + i_ext->len = 0; + set_page_dirty(ipage); + } + goto out; + } + + et = __grab_extent_tree(inode, EX_READ); + + if (!i_ext || !i_ext->len) + goto out; + + get_read_extent_info(&ei, i_ext); + + write_lock(&et->lock); + if (atomic_read(&et->node_cnt)) + goto unlock_out; + + en = __attach_extent_node(sbi, et, &ei, NULL, + &et->root.rb_root.rb_node, true); + if (en) { + et->largest = en->ei; + et->cached_en = en; + + spin_lock(&eti->extent_lock); + list_add_tail(&en->list, &eti->extent_list); + spin_unlock(&eti->extent_lock); + } +unlock_out: + write_unlock(&et->lock); +out: + if (!F2FS_I(inode)->extent_tree[EX_READ]) + set_inode_flag(inode, FI_NO_EXTENT); +} + +void f2fs_init_extent_tree(struct inode *inode) +{ + /* initialize read cache */ + if (__init_may_extent_tree(inode, EX_READ)) + __grab_extent_tree(inode, EX_READ); +} + +static bool __lookup_extent_tree(struct inode *inode, pgoff_t pgofs, + struct extent_info *ei, enum extent_type type) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); + struct extent_tree_info *eti = &sbi->extent_tree[type]; + struct extent_tree *et = F2FS_I(inode)->extent_tree[type]; + struct extent_node *en; + bool ret = false; + + if (!et) + return false; + + trace_f2fs_lookup_extent_tree_start(inode, pgofs, type); + + read_lock(&et->lock); + + if (type == EX_READ && + 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 = (struct extent_node *)f2fs_lookup_rb_tree(&et->root, + (struct rb_entry *)et->cached_en, pgofs); + if (!en) + goto out; + + if (en == et->cached_en) + stat_inc_cached_node_hit(sbi, type); + else + stat_inc_rbtree_node_hit(sbi, type); + + *ei = en->ei; + spin_lock(&eti->extent_lock); + if (!list_empty(&en->list)) { + list_move_tail(&en->list, &eti->extent_list); + et->cached_en = en; + } + spin_unlock(&eti->extent_lock); + ret = true; +out: + stat_inc_total_hit(sbi, type); + read_unlock(&et->lock); + + if (type == EX_READ) + trace_f2fs_lookup_read_extent_tree_end(inode, pgofs, ei); + return ret; +} + +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_tree_info *eti = &sbi->extent_tree[et->type]; + struct extent_node *en = NULL; + + if (prev_ex && __is_back_mergeable(ei, &prev_ex->ei, et->type)) { + prev_ex->ei.len += ei->len; + ei = &prev_ex->ei; + en = prev_ex; + } + + if (next_ex && __is_front_mergeable(ei, &next_ex->ei, et->type)) { + next_ex->ei.fofs = ei->fofs; + next_ex->ei.len += ei->len; + if (et->type == EX_READ) + next_ex->ei.blk = ei->blk; + if (en) + __release_extent_node(sbi, et, prev_ex); + + en = next_ex; + } + + if (!en) + return NULL; + + __try_update_largest_extent(et, en); + + spin_lock(&eti->extent_lock); + if (!list_empty(&en->list)) { + list_move_tail(&en->list, &eti->extent_list); + et->cached_en = en; + } + spin_unlock(&eti->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, + bool leftmost) +{ + struct extent_tree_info *eti = &sbi->extent_tree[et->type]; + struct rb_node **p; + struct rb_node *parent = NULL; + struct extent_node *en = NULL; + + if (insert_p && insert_parent) { + parent = insert_parent; + p = insert_p; + goto do_insert; + } + + leftmost = true; + + p = f2fs_lookup_rb_tree_for_insert(sbi, &et->root, &parent, + ei->fofs, &leftmost); +do_insert: + en = __attach_extent_node(sbi, et, ei, parent, p, leftmost); + if (!en) + return NULL; + + __try_update_largest_extent(et, en); + + /* update in global extent list */ + spin_lock(&eti->extent_lock); + list_add_tail(&en->list, &eti->extent_list); + et->cached_en = en; + spin_unlock(&eti->extent_lock); + return en; +} + +static void __update_extent_tree_range(struct inode *inode, + struct extent_info *tei, enum extent_type type) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); + struct extent_tree *et = F2FS_I(inode)->extent_tree[type]; + 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 fofs = tei->fofs, len = tei->len; + unsigned int end = fofs + len; + bool updated = false; + bool leftmost = false; + + if (!et) + return; + + if (type == EX_READ) + trace_f2fs_update_read_extent_tree_range(inode, fofs, len, + tei->blk, 0); + write_lock(&et->lock); + + if (type == EX_READ) { + if (is_inode_flag_set(inode, FI_NO_EXTENT)) { + write_unlock(&et->lock); + return; + } + + prev = et->largest; + dei.len = 0; + + /* + * drop largest extent before lookup, in case it's already + * been shrunk from extent tree + */ + __drop_largest_extent(et, fofs, len); + } + + /* 1. lookup first extent node in range [fofs, fofs + len - 1] */ + en = (struct extent_node *)f2fs_lookup_rb_tree_ret(&et->root, + (struct rb_entry *)et->cached_en, fofs, + (struct rb_entry **)&prev_en, + (struct rb_entry **)&next_en, + &insert_p, &insert_parent, false, + &leftmost); + 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, fofs >= org_end); + + if (fofs > dei.fofs && (type != EX_READ || + fofs - dei.fofs >= F2FS_MIN_EXTENT_LEN)) { + en->ei.len = fofs - en->ei.fofs; + prev_en = en; + parts = 1; + } + + if (end < org_end && (type != EX_READ || + org_end - end >= F2FS_MIN_EXTENT_LEN)) { + if (parts) { + __set_extent_info(&ei, + end, org_end - end, + end - dei.fofs + dei.blk, false, + type); + en1 = __insert_extent_tree(sbi, et, &ei, + NULL, NULL, true); + next_en = en1; + } else { + __set_extent_info(&en->ei, + end, en->ei.len - (end - dei.fofs), + en->ei.blk + (end - dei.fofs), true, + type); + next_en = en; + } + parts++; + } + + if (!next_en) { + struct rb_node *node = rb_next(&en->rb_node); + + next_en = rb_entry_safe(node, struct extent_node, + rb_node); + } + + 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 read extent cache */ + BUG_ON(type != EX_READ); + + if (tei->blk) { + __set_extent_info(&ei, fofs, len, tei->blk, false, EX_READ); + if (!__try_merge_extent_node(sbi, et, &ei, prev_en, next_en)) + __insert_extent_tree(sbi, et, &ei, + insert_p, insert_parent, leftmost); + + /* 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; + et->largest_updated = true; + set_inode_flag(inode, FI_NO_EXTENT); + } + } + + if (is_inode_flag_set(inode, FI_NO_EXTENT)) + __free_extent_tree(sbi, et); + + if (et->largest_updated) { + et->largest_updated = false; + updated = true; + } + + write_unlock(&et->lock); + + if (updated) + f2fs_mark_inode_dirty_sync(inode, true); +} + +#ifdef CONFIG_F2FS_FS_COMPRESSION +void f2fs_update_read_extent_tree_range_compressed(struct inode *inode, + pgoff_t fofs, block_t blkaddr, unsigned int llen, + unsigned int c_len) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); + struct extent_tree *et = F2FS_I(inode)->extent_tree[EX_READ]; + struct extent_node *en = NULL; + struct extent_node *prev_en = NULL, *next_en = NULL; + struct extent_info ei; + struct rb_node **insert_p = NULL, *insert_parent = NULL; + bool leftmost = false; + + trace_f2fs_update_read_extent_tree_range(inode, fofs, llen, + blkaddr, c_len); + + /* it is safe here to check FI_NO_EXTENT w/o et->lock in ro image */ + if (is_inode_flag_set(inode, FI_NO_EXTENT)) + return; + + write_lock(&et->lock); + + en = (struct extent_node *)f2fs_lookup_rb_tree_ret(&et->root, + (struct rb_entry *)et->cached_en, fofs, + (struct rb_entry **)&prev_en, + (struct rb_entry **)&next_en, + &insert_p, &insert_parent, false, + &leftmost); + if (en) + goto unlock_out; + + __set_extent_info(&ei, fofs, llen, blkaddr, true, EX_READ); + ei.c_len = c_len; + + if (!__try_merge_extent_node(sbi, et, &ei, prev_en, next_en)) + __insert_extent_tree(sbi, et, &ei, + insert_p, insert_parent, leftmost); +unlock_out: + write_unlock(&et->lock); +} +#endif + +static void __update_extent_cache(struct dnode_of_data *dn, enum extent_type type) +{ + struct extent_info ei; + + if (!__may_extent_tree(dn->inode, type)) + return; + + ei.fofs = f2fs_start_bidx_of_node(ofs_of_node(dn->node_page), dn->inode) + + dn->ofs_in_node; + ei.len = 1; + + if (type == EX_READ) { + if (dn->data_blkaddr == NEW_ADDR) + ei.blk = NULL_ADDR; + else + ei.blk = dn->data_blkaddr; + } + __update_extent_tree_range(dn->inode, &ei, type); +} + +static unsigned int __shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink, + enum extent_type type) +{ + struct extent_tree_info *eti = &sbi->extent_tree[type]; + struct extent_tree *et, *next; + struct extent_node *en; + unsigned int node_cnt = 0, tree_cnt = 0; + int remained; + + if (!atomic_read(&eti->total_zombie_tree)) + goto free_node; + + if (!mutex_trylock(&eti->extent_tree_lock)) + goto out; + + /* 1. remove unreferenced extent tree */ + list_for_each_entry_safe(et, next, &eti->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(&eti->extent_tree_root, et->ino); + kmem_cache_free(extent_tree_slab, et); + atomic_dec(&eti->total_ext_tree); + atomic_dec(&eti->total_zombie_tree); + tree_cnt++; + + if (node_cnt + tree_cnt >= nr_shrink) + goto unlock_out; + cond_resched(); + } + mutex_unlock(&eti->extent_tree_lock); + +free_node: + /* 2. remove LRU extent entries */ + if (!mutex_trylock(&eti->extent_tree_lock)) + goto out; + + remained = nr_shrink - (node_cnt + tree_cnt); + + spin_lock(&eti->extent_lock); + for (; remained > 0; remained--) { + if (list_empty(&eti->extent_list)) + break; + en = list_first_entry(&eti->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, &eti->extent_list); + continue; + } + + list_del_init(&en->list); + spin_unlock(&eti->extent_lock); + + __detach_extent_node(sbi, et, en); + + write_unlock(&et->lock); + node_cnt++; + spin_lock(&eti->extent_lock); + } + spin_unlock(&eti->extent_lock); + +unlock_out: + mutex_unlock(&eti->extent_tree_lock); +out: + trace_f2fs_shrink_extent_tree(sbi, node_cnt, tree_cnt, type); + + return node_cnt + tree_cnt; +} + +/* read extent cache operations */ +bool f2fs_lookup_read_extent_cache(struct inode *inode, pgoff_t pgofs, + struct extent_info *ei) +{ + if (!__may_extent_tree(inode, EX_READ)) + return false; + + return __lookup_extent_tree(inode, pgofs, ei, EX_READ); +} + +void f2fs_update_read_extent_cache(struct dnode_of_data *dn) +{ + return __update_extent_cache(dn, EX_READ); +} + +void f2fs_update_read_extent_cache_range(struct dnode_of_data *dn, + pgoff_t fofs, block_t blkaddr, unsigned int len) +{ + struct extent_info ei = { + .fofs = fofs, + .len = len, + .blk = blkaddr, + }; + + if (!__may_extent_tree(dn->inode, EX_READ)) + return; + + __update_extent_tree_range(dn->inode, &ei, EX_READ); +} + +unsigned int f2fs_shrink_read_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink) +{ + if (!test_opt(sbi, READ_EXTENT_CACHE)) + return 0; + + return __shrink_extent_tree(sbi, nr_shrink, EX_READ); +} + +static unsigned int __destroy_extent_node(struct inode *inode, + enum extent_type type) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); + struct extent_tree *et = F2FS_I(inode)->extent_tree[type]; + 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_node(struct inode *inode) +{ + __destroy_extent_node(inode, EX_READ); +} + +static void __drop_extent_tree(struct inode *inode, enum extent_type type) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); + struct extent_tree *et = F2FS_I(inode)->extent_tree[type]; + bool updated = false; + + if (!__may_extent_tree(inode, type)) + return; + + write_lock(&et->lock); + __free_extent_tree(sbi, et); + if (type == EX_READ) { + set_inode_flag(inode, FI_NO_EXTENT); + if (et->largest.len) { + et->largest.len = 0; + updated = true; + } + } + write_unlock(&et->lock); + if (updated) + f2fs_mark_inode_dirty_sync(inode, true); +} + +void f2fs_drop_extent_tree(struct inode *inode) +{ + __drop_extent_tree(inode, EX_READ); +} + +static void __destroy_extent_tree(struct inode *inode, enum extent_type type) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); + struct extent_tree_info *eti = &sbi->extent_tree[type]; + struct extent_tree *et = F2FS_I(inode)->extent_tree[type]; + unsigned int node_cnt = 0; + + if (!et) + return; + + if (inode->i_nlink && !is_bad_inode(inode) && + atomic_read(&et->node_cnt)) { + mutex_lock(&eti->extent_tree_lock); + list_add_tail(&et->list, &eti->zombie_list); + atomic_inc(&eti->total_zombie_tree); + mutex_unlock(&eti->extent_tree_lock); + return; + } + + /* free all extent info belong to this extent tree */ + node_cnt = __destroy_extent_node(inode, type); + + /* delete extent tree entry in radix tree */ + mutex_lock(&eti->extent_tree_lock); + f2fs_bug_on(sbi, atomic_read(&et->node_cnt)); + radix_tree_delete(&eti->extent_tree_root, inode->i_ino); + kmem_cache_free(extent_tree_slab, et); + atomic_dec(&eti->total_ext_tree); + mutex_unlock(&eti->extent_tree_lock); + + F2FS_I(inode)->extent_tree[type] = NULL; + + trace_f2fs_destroy_extent_tree(inode, node_cnt, type); +} + +void f2fs_destroy_extent_tree(struct inode *inode) +{ + __destroy_extent_tree(inode, EX_READ); +} + +static void __init_extent_tree_info(struct extent_tree_info *eti) +{ + INIT_RADIX_TREE(&eti->extent_tree_root, GFP_NOIO); + mutex_init(&eti->extent_tree_lock); + INIT_LIST_HEAD(&eti->extent_list); + spin_lock_init(&eti->extent_lock); + atomic_set(&eti->total_ext_tree, 0); + INIT_LIST_HEAD(&eti->zombie_list); + atomic_set(&eti->total_zombie_tree, 0); + atomic_set(&eti->total_ext_node, 0); +} + +void f2fs_init_extent_cache_info(struct f2fs_sb_info *sbi) +{ + __init_extent_tree_info(&sbi->extent_tree[EX_READ]); +} + +int __init f2fs_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 f2fs_destroy_extent_cache(void) +{ + kmem_cache_destroy(extent_node_slab); + kmem_cache_destroy(extent_tree_slab); +} |