From: Jaegeuk Kim jaegeuk@kernel.org
commit bf21acf9959a48d90dd32869a0649525eb21be56 upstream.
This is a last part to remove the memory sharing for rb_tree in extent_cache.
This should also fix arm32 memory alignment issue.
[struct extent_node] [struct rb_entry] [0] struct rb_node rb_node; [0] struct rb_node rb_node; union { union { struct { struct { [16] unsigned int fofs; [12] unsigned int ofs; unsigned int len; unsigned int len; }; unsigned long long key; } __packed;
Cc: stable@vger.kernel.org Fixes: 13054c548a1c ("f2fs: introduce infra macro and data structure of rb-tree extent cache") Reviewed-by: Chao Yu chao@kernel.org Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/f2fs/extent_cache.c | 177 +++++++++++++++++++------------------------------ fs/f2fs/f2fs.h | 6 - 2 files changed, 71 insertions(+), 112 deletions(-)
--- a/fs/f2fs/extent_cache.c +++ b/fs/f2fs/extent_cache.c @@ -161,95 +161,52 @@ static bool __is_front_mergeable(struct 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) +static struct extent_node *__lookup_extent_node(struct rb_root_cached *root, + struct extent_node *cached_en, unsigned int fofs) { struct rb_node *node = root->rb_root.rb_node; - struct rb_entry *re; + struct extent_node *en; + + /* check a cached entry */ + if (cached_en && cached_en->ei.fofs <= fofs && + cached_en->ei.fofs + cached_en->ei.len > fofs) + return cached_en;
+ /* check rb_tree */ while (node) { - re = rb_entry(node, struct rb_entry, rb_node); + en = rb_entry(node, struct extent_node, rb_node);
- if (ofs < re->ofs) + if (fofs < en->ei.fofs) node = node->rb_left; - else if (ofs >= re->ofs + re->len) + else if (fofs >= en->ei.fofs + en->ei.len) node = node->rb_right; else - return re; + return en; } return NULL; }
-static 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; -} - -static 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, + * lookup rb entry in position of @fofs 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 + * @prev_ex: extent before fofs + * @next_ex: extent after fofs + * @insert_p: insert point for new extent at fofs * in order to simplify the insertion after. * tree must stay unchanged between lookup and insertion. */ -static 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, +static struct extent_node *__lookup_extent_node_ret(struct rb_root_cached *root, + struct extent_node *cached_en, + unsigned int fofs, + struct extent_node **prev_entry, + struct extent_node **next_entry, struct rb_node ***insert_p, struct rb_node **insert_parent, - bool force, bool *leftmost) + bool *leftmost) { struct rb_node **pnode = &root->rb_root.rb_node; struct rb_node *parent = NULL, *tmp_node; - struct rb_entry *re = cached_re; + struct extent_node *en = cached_en;
*insert_p = NULL; *insert_parent = NULL; @@ -259,24 +216,20 @@ static struct rb_entry *f2fs_lookup_rb_t if (RB_EMPTY_ROOT(&root->rb_root)) return NULL;
- if (re) { - if (re->ofs <= ofs && re->ofs + re->len > ofs) - goto lookup_neighbors; - } + if (en && en->ei.fofs <= fofs && en->ei.fofs + en->ei.len > fofs) + goto lookup_neighbors;
- if (leftmost) - *leftmost = true; + *leftmost = true;
while (*pnode) { parent = *pnode; - re = rb_entry(*pnode, struct rb_entry, rb_node); + en = rb_entry(*pnode, struct extent_node, rb_node);
- if (ofs < re->ofs) { + if (fofs < en->ei.fofs) { pnode = &(*pnode)->rb_left; - } else if (ofs >= re->ofs + re->len) { + } else if (fofs >= en->ei.fofs + en->ei.len) { pnode = &(*pnode)->rb_right; - if (leftmost) - *leftmost = false; + *leftmost = false; } else { goto lookup_neighbors; } @@ -285,30 +238,32 @@ static struct rb_entry *f2fs_lookup_rb_t *insert_p = pnode; *insert_parent = parent;
- re = rb_entry(parent, struct rb_entry, rb_node); + en = rb_entry(parent, struct extent_node, rb_node); tmp_node = parent; - if (parent && ofs > re->ofs) + if (parent && fofs > en->ei.fofs) tmp_node = rb_next(parent); - *next_entry = rb_entry_safe(tmp_node, struct rb_entry, rb_node); + *next_entry = rb_entry_safe(tmp_node, struct extent_node, rb_node);
tmp_node = parent; - if (parent && ofs < re->ofs) + if (parent && fofs < en->ei.fofs) tmp_node = rb_prev(parent); - *prev_entry = rb_entry_safe(tmp_node, struct rb_entry, rb_node); + *prev_entry = rb_entry_safe(tmp_node, struct extent_node, rb_node); return NULL;
lookup_neighbors: - if (ofs == re->ofs || force) { + if (fofs == en->ei.fofs) { /* 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); + tmp_node = rb_prev(&en->rb_node); + *prev_entry = rb_entry_safe(tmp_node, + struct extent_node, rb_node); } - if (ofs == re->ofs + re->len - 1 || force) { + if (fofs == en->ei.fofs + en->ei.len - 1) { /* 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); + tmp_node = rb_next(&en->rb_node); + *next_entry = rb_entry_safe(tmp_node, + struct extent_node, rb_node); } - return re; + return en; }
static struct kmem_cache *extent_tree_slab; @@ -523,8 +478,7 @@ static bool __lookup_extent_tree(struct goto out; }
- en = (struct extent_node *)f2fs_lookup_rb_tree(&et->root, - (struct rb_entry *)et->cached_en, pgofs); + en = __lookup_extent_node(&et->root, et->cached_en, pgofs); if (!en) goto out;
@@ -598,7 +552,7 @@ static struct extent_node *__insert_exte bool leftmost) { struct extent_tree_info *eti = &sbi->extent_tree[et->type]; - struct rb_node **p; + struct rb_node **p = &et->root.rb_root.rb_node; struct rb_node *parent = NULL; struct extent_node *en = NULL;
@@ -610,8 +564,21 @@ static struct extent_node *__insert_exte
leftmost = true;
- p = f2fs_lookup_rb_tree_for_insert(sbi, &et->root, &parent, - ei->fofs, &leftmost); + /* look up extent_node in the rb tree */ + 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; + leftmost = false; + } else { + f2fs_bug_on(sbi, 1); + } + } + do_insert: en = __attach_extent_node(sbi, et, ei, parent, p, leftmost); if (!en) @@ -670,11 +637,10 @@ static void __update_extent_tree_range(s }
/* 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, + en = __lookup_extent_node_ret(&et->root, + et->cached_en, fofs, + &prev_en, &next_en, + &insert_p, &insert_parent, &leftmost); if (!en) en = next_en; @@ -812,12 +778,11 @@ void f2fs_update_read_extent_tree_range_
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); + en = __lookup_extent_node_ret(&et->root, + et->cached_en, fofs, + &prev_en, &next_en, + &insert_p, &insert_parent, + &leftmost); if (en) goto unlock_out;
--- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -620,12 +620,6 @@ enum extent_type { NR_EXTENT_CACHES, };
-struct rb_entry { - struct rb_node rb_node; /* rb node located in rb-tree */ - unsigned int ofs; /* start offset of the entry */ - unsigned int len; /* length of the entry */ -}; - struct extent_info { unsigned int fofs; /* start offset in a file */ unsigned int len; /* length of the extent */