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Mon, 09 Jan 2023 12:53:48 -0800 (PST) Date: Mon, 9 Jan 2023 12:52:58 -0800 In-Reply-To: <20230109205336.3665937-1-surenb@google.com> Mime-Version: 1.0 References: <20230109205336.3665937-1-surenb@google.com> X-Mailer: git-send-email 2.39.0.314.g84b9a713c41-goog Message-ID: <20230109205336.3665937-4-surenb@google.com> Subject: [PATCH 03/41] maple_tree: Fix freeing of nodes in rcu mode From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: michel@lespinasse.org, jglisse@google.com, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, mgorman@techsingularity.net, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, peterz@infradead.org, ldufour@linux.ibm.com, laurent.dufour@fr.ibm.com, paulmck@kernel.org, luto@kernel.org, songliubraving@fb.com, peterx@redhat.com, david@redhat.com, dhowells@redhat.com, hughd@google.com, bigeasy@linutronix.de, kent.overstreet@linux.dev, punit.agrawal@bytedance.com, lstoakes@gmail.com, peterjung1337@gmail.com, rientjes@google.com, axelrasmussen@google.com, joelaf@google.com, minchan@google.com, jannh@google.com, shakeelb@google.com, tatashin@google.com, edumazet@google.com, gthelen@google.com, gurua@google.com, arjunroy@google.com, soheil@google.com, hughlynch@google.com, leewalsh@google.com, posk@google.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, x86@kernel.org, linux-kernel@vger.kernel.org, kernel-team@android.com, surenb@google.com, Liam Howlett X-Rspamd-Queue-Id: 0DF63180007 X-Rspamd-Server: rspam09 X-Rspam-User: X-Stat-Signature: xfhs58qxgy5yjiphj3164pxuuyj3rnbu X-HE-Tag: 1673297628-614989 X-HE-Meta: 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 8zSc4qpz WDcI9saAu9MTvyZ6fnXbbPtiM2UnzTuGg1nS3XATVmeUv8++v8wq1jL/6Emz8ItySOS434HTDoMVW+VEpECOg3J6kIC9NbyL0MoFw+yOn0r87dC8YChP9ilzwqyb00PVHFWN88bjFHnTd1kU387H5108GfRqWenPDpL7z4rK9lGpsj8gto2SOfpPVAy6awkmbXUnEcOlBiCUmGZvXERi7HuNipwn67+OElCxvDQmxR5l0CrbJ2ABCEKOMtz1baUdgvxW9yPegsCsWhBRW7E5O4n6F1OsgimQToklnWpQBIOCxcSZQF+yUEuzjWyhET8kfE+MiTdK69obpYZ0iVzMYSFCS02bqBQ9cjxUU5vwv8sjlNAO3YoTw9A+095z04kAanuyYJ7QIUmnouq4i7vEa7k2qYgfVuhEXnwOg X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Liam Howlett The walk to destroy the nodes was not always setting the node type and would result in a destroy method potentially using the values as nodes. Avoid this by setting the correct node types. This is necessary for the RCU mode of the maple tree. Fixes: 54a611b60590 ("Maple Tree: add new data structure") Signed-off-by: Liam Howlett Signed-off-by: Suren Baghdasaryan --- lib/maple_tree.c | 73 ++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 62 insertions(+), 11 deletions(-) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index a748938ad2e9..a11eea943f8d 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -897,6 +897,44 @@ static inline void ma_set_meta(struct maple_node *mn, enum maple_type mt, meta->end = end; } +/* + * mas_clear_meta() - clear the metadata information of a node, if it exists + * @mas: The maple state + * @mn: The maple node + * @mt: The maple node type + * @offset: The offset of the highest sub-gap in this node. + * @end: The end of the data in this node. + */ +static inline void mas_clear_meta(struct ma_state *mas, struct maple_node *mn, + enum maple_type mt) +{ + struct maple_metadata *meta; + unsigned long *pivots; + void __rcu **slots; + void *next; + + switch (mt) { + case maple_range_64: + pivots = mn->mr64.pivot; + if (unlikely(pivots[MAPLE_RANGE64_SLOTS - 2])) { + slots = mn->mr64.slot; + next = mas_slot_locked(mas, slots, + MAPLE_RANGE64_SLOTS - 1); + if (unlikely((mte_to_node(next) && mte_node_type(next)))) + return; /* The last slot is a node, no metadata */ + } + fallthrough; + case maple_arange_64: + meta = ma_meta(mn, mt); + break; + default: + return; + } + + meta->gap = 0; + meta->end = 0; +} + /* * ma_meta_end() - Get the data end of a node from the metadata * @mn: The maple node @@ -5448,20 +5486,22 @@ static inline int mas_rev_alloc(struct ma_state *mas, unsigned long min, * mas_dead_leaves() - Mark all leaves of a node as dead. * @mas: The maple state * @slots: Pointer to the slot array + * @type: The maple node type * * Must hold the write lock. * * Return: The number of leaves marked as dead. */ static inline -unsigned char mas_dead_leaves(struct ma_state *mas, void __rcu **slots) +unsigned char mas_dead_leaves(struct ma_state *mas, void __rcu **slots, + enum maple_type mt) { struct maple_node *node; enum maple_type type; void *entry; int offset; - for (offset = 0; offset < mt_slot_count(mas->node); offset++) { + for (offset = 0; offset < mt_slots[mt]; offset++) { entry = mas_slot_locked(mas, slots, offset); type = mte_node_type(entry); node = mte_to_node(entry); @@ -5480,14 +5520,13 @@ unsigned char mas_dead_leaves(struct ma_state *mas, void __rcu **slots) static void __rcu **mas_dead_walk(struct ma_state *mas, unsigned char offset) { - struct maple_node *node, *next; + struct maple_node *next; void __rcu **slots = NULL; next = mas_mn(mas); do { - mas->node = ma_enode_ptr(next); - node = mas_mn(mas); - slots = ma_slots(node, node->type); + mas->node = mt_mk_node(next, next->type); + slots = ma_slots(next, next->type); next = mas_slot_locked(mas, slots, offset); offset = 0; } while (!ma_is_leaf(next->type)); @@ -5551,11 +5590,14 @@ static inline void __rcu **mas_destroy_descend(struct ma_state *mas, node = mas_mn(mas); slots = ma_slots(node, mte_node_type(mas->node)); next = mas_slot_locked(mas, slots, 0); - if ((mte_dead_node(next))) + if ((mte_dead_node(next))) { + mte_to_node(next)->type = mte_node_type(next); next = mas_slot_locked(mas, slots, 1); + } mte_set_node_dead(mas->node); node->type = mte_node_type(mas->node); + mas_clear_meta(mas, node, node->type); node->piv_parent = prev; node->parent_slot = offset; offset = 0; @@ -5575,13 +5617,18 @@ static void mt_destroy_walk(struct maple_enode *enode, unsigned char ma_flags, MA_STATE(mas, &mt, 0, 0); - if (mte_is_leaf(enode)) + mas.node = enode; + if (mte_is_leaf(enode)) { + node->type = mte_node_type(enode); goto free_leaf; + } + ma_flags &= ~MT_FLAGS_LOCK_MASK; mt_init_flags(&mt, ma_flags); mas_lock(&mas); - mas.node = start = enode; + mte_to_node(enode)->ma_flags = ma_flags; + start = enode; slots = mas_destroy_descend(&mas, start, 0); node = mas_mn(&mas); do { @@ -5589,7 +5636,8 @@ static void mt_destroy_walk(struct maple_enode *enode, unsigned char ma_flags, unsigned char offset; struct maple_enode *parent, *tmp; - node->slot_len = mas_dead_leaves(&mas, slots); + node->type = mte_node_type(mas.node); + node->slot_len = mas_dead_leaves(&mas, slots, node->type); if (free) mt_free_bulk(node->slot_len, slots); offset = node->parent_slot + 1; @@ -5613,7 +5661,8 @@ static void mt_destroy_walk(struct maple_enode *enode, unsigned char ma_flags, } while (start != mas.node); node = mas_mn(&mas); - node->slot_len = mas_dead_leaves(&mas, slots); + node->type = mte_node_type(mas.node); + node->slot_len = mas_dead_leaves(&mas, slots, node->type); if (free) mt_free_bulk(node->slot_len, slots); @@ -5623,6 +5672,8 @@ static void mt_destroy_walk(struct maple_enode *enode, unsigned char ma_flags, free_leaf: if (free) mt_free_rcu(&node->rcu); + else + mas_clear_meta(&mas, node, node->type); } /*