[PATCH openEuler-1.0-LTS 0/2] quota: Fix rcu annotations of inode dquot pointers
Jan Kara (1): quota: Fix rcu annotations of inode dquot pointers Jiang Biao (1): fs/quota: erase unused but set variable warning fs/quota/dquot.c | 71 +++++++++++++++++++++++++++++------------------- 1 file changed, 43 insertions(+), 28 deletions(-) -- 2.31.1
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From: Jiang Biao <benbjiang@tencent.com> stable inclusion from stable-v4.19.311 commit 1974c13019b97140149690cd622a9c6732c32124 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IA8B9H CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ Upstream commit 78bc3334a69ff289dbc973a9db7c52a2d7757e5b ] Local variable *reserved* of remove_dquot_ref() is only used if define CONFIG_QUOTA_DEBUG, but not ebraced in CONFIG_QUOTA_DEBUG macro, which leads to unused-but-set-variable warning when compiling. This patch ebrace it into CONFIG_QUOTA_DEBUG macro like what is done in add_dquot_ref(). Signed-off-by: Jiang Biao <benbjiang@tencent.com> Signed-off-by: Jan Kara <jack@suse.cz> Stable-dep-of: 179b8c97ebf6 ("quota: Fix rcu annotations of inode dquot pointers") Signed-off-by: Sasha Levin <sashal@kernel.org> Conflicts: fs/quota/dquot.c [Because commit 7bce48f0fec6 ("quota: simplify drop_dquot_ref()") was merged before this commit.] Signed-off-by: Baokun Li <libaokun1@huawei.com> --- fs/quota/dquot.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c index 2318e9aec408..645f49a484b3 100644 --- a/fs/quota/dquot.c +++ b/fs/quota/dquot.c @@ -1079,7 +1079,9 @@ static int add_dquot_ref(struct super_block *sb, int type) static void remove_dquot_ref(struct super_block *sb, int type) { struct inode *inode; +#ifdef CONFIG_QUOTA_DEBUG int reserved = 0; +#endif spin_lock(&sb->s_inode_list_lock); list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { @@ -1094,9 +1096,10 @@ static void remove_dquot_ref(struct super_block *sb, int type) struct dquot **dquots = i_dquot(inode); struct dquot *dquot = dquots[type]; +#ifdef CONFIG_QUOTA_DEBUG if (unlikely(inode_get_rsv_space(inode) > 0)) reserved = 1; - +#endif dquots[type] = NULL; if (dquot) dqput(dquot); -- 2.31.1
From: Jan Kara <jack@suse.cz> stable inclusion from stable-v4.19.311 commit 06172dff9a47e76dfce9b60d44ef21131b417803 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IA8B9H CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ Upstream commit 179b8c97ebf63429589f5afeba59a181fe70603e ] Dquot pointers in i_dquot array in the inode are protected by dquot_srcu. Annotate the array pointers with __rcu, perform the locked dereferences with srcu_dereference_check() instead of plain reads, and set the array elements with rcu_assign_pointer(). Fixes: b9ba6f94b238 ("quota: remove dqptr_sem") Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202402061900.rTuYDlo6-lkp@intel.com/ Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Baokun Li <libaokun1@huawei.com> --- fs/quota/dquot.c | 66 ++++++++++++++++++++++++++++-------------------- 1 file changed, 39 insertions(+), 27 deletions(-) diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c index 645f49a484b3..89ca36a37376 100644 --- a/fs/quota/dquot.c +++ b/fs/quota/dquot.c @@ -399,7 +399,7 @@ int dquot_mark_dquot_dirty(struct dquot *dquot) EXPORT_SYMBOL(dquot_mark_dquot_dirty); /* Dirtify all the dquots - this can block when journalling */ -static inline int mark_all_dquot_dirty(struct dquot * const *dquots) +static inline int mark_all_dquot_dirty(struct dquot __rcu * const *dquots) { int ret, err, cnt; struct dquot *dquot; @@ -996,14 +996,15 @@ struct dquot *dqget(struct super_block *sb, struct kqid qid) } EXPORT_SYMBOL(dqget); -static inline struct dquot **i_dquot(struct inode *inode) +static inline struct dquot __rcu **i_dquot(struct inode *inode) { - return inode->i_sb->s_op->get_dquots(inode); + /* Force __rcu for now until filesystems are fixed */ + return (struct dquot __rcu **)inode->i_sb->s_op->get_dquots(inode); } static int dqinit_needed(struct inode *inode, int type) { - struct dquot * const *dquots; + struct dquot __rcu * const *dquots; int cnt; if (IS_NOQUOTA(inode)) @@ -1093,14 +1094,16 @@ static void remove_dquot_ref(struct super_block *sb, int type) */ spin_lock(&dq_data_lock); if (!IS_NOQUOTA(inode)) { - struct dquot **dquots = i_dquot(inode); - struct dquot *dquot = dquots[type]; + struct dquot __rcu **dquots = i_dquot(inode); + struct dquot *dquot = srcu_dereference_check( + dquots[type], &dquot_srcu, + lockdep_is_held(&dq_data_lock)); #ifdef CONFIG_QUOTA_DEBUG if (unlikely(inode_get_rsv_space(inode) > 0)) reserved = 1; #endif - dquots[type] = NULL; + rcu_assign_pointer(dquots[type], NULL); if (dquot) dqput(dquot); } @@ -1453,7 +1456,8 @@ static int inode_quota_active(const struct inode *inode) static int __dquot_initialize(struct inode *inode, int type) { int cnt, init_needed = 0; - struct dquot **dquots, *got[MAXQUOTAS] = {}; + struct dquot __rcu **dquots; + struct dquot *got[MAXQUOTAS] = {}; struct super_block *sb = inode->i_sb; qsize_t rsv; int ret = 0; @@ -1528,7 +1532,7 @@ static int __dquot_initialize(struct inode *inode, int type) if (!got[cnt]) continue; if (!dquots[cnt]) { - dquots[cnt] = got[cnt]; + rcu_assign_pointer(dquots[cnt], got[cnt]); got[cnt] = NULL; /* * Make quota reservation system happy if someone @@ -1536,12 +1540,16 @@ static int __dquot_initialize(struct inode *inode, int type) */ rsv = inode_get_rsv_space(inode); if (unlikely(rsv)) { + struct dquot *dquot = srcu_dereference_check( + dquots[cnt], &dquot_srcu, + lockdep_is_held(&dq_data_lock)); + spin_lock(&inode->i_lock); /* Get reservation again under proper lock */ rsv = __inode_get_rsv_space(inode); - spin_lock(&dquots[cnt]->dq_dqb_lock); - dquots[cnt]->dq_dqb.dqb_rsvspace += rsv; - spin_unlock(&dquots[cnt]->dq_dqb_lock); + spin_lock(&dquot->dq_dqb_lock); + dquot->dq_dqb.dqb_rsvspace += rsv; + spin_unlock(&dquot->dq_dqb_lock); spin_unlock(&inode->i_lock); } } @@ -1563,7 +1571,7 @@ EXPORT_SYMBOL(dquot_initialize); bool dquot_initialize_needed(struct inode *inode) { - struct dquot **dquots; + struct dquot __rcu **dquots; int i; if (!inode_quota_active(inode)) @@ -1588,13 +1596,14 @@ EXPORT_SYMBOL(dquot_initialize_needed); static void __dquot_drop(struct inode *inode) { int cnt; - struct dquot **dquots = i_dquot(inode); + struct dquot __rcu **dquots = i_dquot(inode); struct dquot *put[MAXQUOTAS]; spin_lock(&dq_data_lock); for (cnt = 0; cnt < MAXQUOTAS; cnt++) { - put[cnt] = dquots[cnt]; - dquots[cnt] = NULL; + put[cnt] = srcu_dereference_check(dquots[cnt], &dquot_srcu, + lockdep_is_held(&dq_data_lock)); + rcu_assign_pointer(dquots[cnt], NULL); } spin_unlock(&dq_data_lock); dqput_all(put); @@ -1602,7 +1611,7 @@ static void __dquot_drop(struct inode *inode) void dquot_drop(struct inode *inode) { - struct dquot * const *dquots; + struct dquot __rcu * const *dquots; int cnt; if (IS_NOQUOTA(inode)) @@ -1675,7 +1684,7 @@ int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags) int cnt, ret = 0, index; struct dquot_warn warn[MAXQUOTAS]; int reserve = flags & DQUOT_SPACE_RESERVE; - struct dquot **dquots; + struct dquot __rcu **dquots; struct dquot *dquot; if (!inode_quota_active(inode)) { @@ -1745,7 +1754,7 @@ int dquot_alloc_inode(struct inode *inode) { int cnt, ret = 0, index; struct dquot_warn warn[MAXQUOTAS]; - struct dquot * const *dquots; + struct dquot __rcu * const *dquots; struct dquot *dquot; if (!inode_quota_active(inode)) @@ -1790,7 +1799,7 @@ EXPORT_SYMBOL(dquot_alloc_inode); */ int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) { - struct dquot **dquots; + struct dquot __rcu **dquots; struct dquot *dquot; int cnt, index; @@ -1832,7 +1841,7 @@ EXPORT_SYMBOL(dquot_claim_space_nodirty); */ void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number) { - struct dquot **dquots; + struct dquot __rcu **dquots; struct dquot *dquot; int cnt, index; @@ -1876,7 +1885,7 @@ void __dquot_free_space(struct inode *inode, qsize_t number, int flags) { unsigned int cnt; struct dquot_warn warn[MAXQUOTAS]; - struct dquot **dquots; + struct dquot __rcu **dquots; struct dquot *dquot; int reserve = flags & DQUOT_SPACE_RESERVE, index; @@ -1933,7 +1942,7 @@ void dquot_free_inode(struct inode *inode) { unsigned int cnt; struct dquot_warn warn[MAXQUOTAS]; - struct dquot * const *dquots; + struct dquot __rcu * const *dquots; struct dquot *dquot; int index; @@ -1980,6 +1989,7 @@ int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) qsize_t cur_space; qsize_t rsv_space = 0; qsize_t inode_usage = 1; + struct dquot __rcu **dquots; struct dquot *transfer_from[MAXQUOTAS] = {}; int cnt, index, ret = 0; char is_valid[MAXQUOTAS] = {}; @@ -2012,6 +2022,7 @@ int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) } cur_space = __inode_get_bytes(inode); rsv_space = __inode_get_rsv_space(inode); + dquots = i_dquot(inode); /* * Build the transfer_from list, check limits, and update usage in * the target structures. @@ -2026,7 +2037,8 @@ int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) if (!sb_has_quota_active(inode->i_sb, cnt)) continue; is_valid[cnt] = 1; - transfer_from[cnt] = i_dquot(inode)[cnt]; + transfer_from[cnt] = srcu_dereference_check(dquots[cnt], + &dquot_srcu, lockdep_is_held(&dq_data_lock)); ret = dquot_add_inodes(transfer_to[cnt], inode_usage, &warn_to[cnt]); if (ret) @@ -2065,7 +2077,7 @@ int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) rsv_space); spin_unlock(&transfer_from[cnt]->dq_dqb_lock); } - i_dquot(inode)[cnt] = transfer_to[cnt]; + rcu_assign_pointer(dquots[cnt], transfer_to[cnt]); } spin_unlock(&inode->i_lock); spin_unlock(&dq_data_lock); @@ -2076,8 +2088,8 @@ int __dquot_transfer(struct inode *inode, struct dquot **transfer_to) * mark_all_dquot_dirty(). */ index = srcu_read_lock(&dquot_srcu); - mark_all_dquot_dirty(transfer_from); - mark_all_dquot_dirty(transfer_to); + mark_all_dquot_dirty((struct dquot __rcu **)transfer_from); + mark_all_dquot_dirty((struct dquot __rcu **)transfer_to); srcu_read_unlock(&dquot_srcu, index); flush_warnings(warn_to); -- 2.31.1
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