From: Li Chen Date: Wed, 13 May 2026 08:58:17 +0000 (+0800) Subject: ext4: fix fast commit wait/wake bit mapping on 64-bit X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8b3bc93fee6771775243665a0cf31857d6659775;p=thirdparty%2Flinux.git ext4: fix fast commit wait/wake bit mapping on 64-bit On 64-bit, ext4 dynamic inode states live in the upper half of i_flags, and ext4_test_inode_state() applies the corresponding +32 offset. The fast-commit wait and wake paths open-coded the wait key with the raw EXT4_STATE_* value. Add small helpers for the state wait word and bit, and use them for the FC_COMMITTING and FC_FLUSHING_DATA waits so the wait key follows the same mapping as the state helpers. Fixes: 857d32f26181 ("ext4: rework fast commit commit path") Reported-by: Sashiko AI review Signed-off-by: Li Chen Reviewed-by: Baokun Li Reviewed-by: Zhang Yi Reviewed-by: Jan Kara Link: https://patch.msgid.link/20260513085818.552432-1-me@linux.beauty Signed-off-by: Theodore Ts'o --- diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 94283a991e5c4..6569d1d575a01 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -2000,6 +2000,8 @@ EXT4_INODE_BIT_FNS(flag, flags, 0) static inline int ext4_test_inode_state(struct inode *inode, int bit); static inline void ext4_set_inode_state(struct inode *inode, int bit); static inline void ext4_clear_inode_state(struct inode *inode, int bit); +static inline unsigned long *ext4_inode_state_wait_word(struct inode *inode); +static inline int ext4_inode_state_wait_bit(int bit); #if (BITS_PER_LONG < 64) EXT4_INODE_BIT_FNS(state, state_flags, 0) @@ -2015,6 +2017,24 @@ static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) /* We depend on the fact that callers will set i_flags */ } #endif + +static inline unsigned long *ext4_inode_state_wait_word(struct inode *inode) +{ +#if (BITS_PER_LONG < 64) + return &EXT4_I(inode)->i_state_flags; +#else + return &EXT4_I(inode)->i_flags; +#endif +} + +static inline int ext4_inode_state_wait_bit(int bit) +{ +#if (BITS_PER_LONG < 64) + return bit; +#else + return bit + 32; +#endif +} #else /* Assume that user mode programs are passing in an ext4fs superblock, not * a kernel struct super_block. This will allow us to call the feature-test diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c index b3c22636251dd..1775bce9649a9 100644 --- a/fs/ext4/fast_commit.c +++ b/fs/ext4/fast_commit.c @@ -239,6 +239,8 @@ void ext4_fc_del(struct inode *inode) struct ext4_inode_info *ei = EXT4_I(inode); struct ext4_fc_dentry_update *fc_dentry; wait_queue_head_t *wq; + unsigned long *wait_word = ext4_inode_state_wait_word(inode); + int wait_bit = ext4_inode_state_wait_bit(EXT4_STATE_FC_FLUSHING_DATA); int alloc_ctx; if (ext4_fc_disabled(inode->i_sb)) @@ -268,17 +270,9 @@ void ext4_fc_del(struct inode *inode) WARN_ON(ext4_test_inode_state(inode, EXT4_STATE_FC_COMMITTING) && !ext4_test_mount_flag(inode->i_sb, EXT4_MF_FC_INELIGIBLE)); while (ext4_test_inode_state(inode, EXT4_STATE_FC_FLUSHING_DATA)) { -#if (BITS_PER_LONG < 64) - DEFINE_WAIT_BIT(wait, &ei->i_state_flags, - EXT4_STATE_FC_FLUSHING_DATA); - wq = bit_waitqueue(&ei->i_state_flags, - EXT4_STATE_FC_FLUSHING_DATA); -#else - DEFINE_WAIT_BIT(wait, &ei->i_flags, - EXT4_STATE_FC_FLUSHING_DATA); - wq = bit_waitqueue(&ei->i_flags, - EXT4_STATE_FC_FLUSHING_DATA); -#endif + DEFINE_WAIT_BIT(wait, wait_word, wait_bit); + + wq = bit_waitqueue(wait_word, wait_bit); prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE); if (ext4_test_inode_state(inode, EXT4_STATE_FC_FLUSHING_DATA)) { ext4_fc_unlock(inode->i_sb, alloc_ctx); @@ -542,6 +536,8 @@ void ext4_fc_track_inode(handle_t *handle, struct inode *inode) { struct ext4_inode_info *ei = EXT4_I(inode); wait_queue_head_t *wq; + unsigned long *wait_word = ext4_inode_state_wait_word(inode); + int wait_bit = ext4_inode_state_wait_bit(EXT4_STATE_FC_COMMITTING); int ret; if (S_ISDIR(inode->i_mode)) @@ -564,17 +560,9 @@ void ext4_fc_track_inode(handle_t *handle, struct inode *inode) lockdep_assert_not_held(&ei->i_data_sem); while (ext4_test_inode_state(inode, EXT4_STATE_FC_COMMITTING)) { -#if (BITS_PER_LONG < 64) - DEFINE_WAIT_BIT(wait, &ei->i_state_flags, - EXT4_STATE_FC_COMMITTING); - wq = bit_waitqueue(&ei->i_state_flags, - EXT4_STATE_FC_COMMITTING); -#else - DEFINE_WAIT_BIT(wait, &ei->i_flags, - EXT4_STATE_FC_COMMITTING); - wq = bit_waitqueue(&ei->i_flags, - EXT4_STATE_FC_COMMITTING); -#endif + DEFINE_WAIT_BIT(wait, wait_word, wait_bit); + + wq = bit_waitqueue(wait_word, wait_bit); prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE); if (ext4_test_inode_state(inode, EXT4_STATE_FC_COMMITTING)) schedule(); @@ -1034,6 +1022,8 @@ static int ext4_fc_perform_commit(journal_t *journal) int ret = 0; u32 crc = 0; int alloc_ctx; + int flushing_wait_bit = + ext4_inode_state_wait_bit(EXT4_STATE_FC_FLUSHING_DATA); /* * Step 1: Mark all inodes on s_fc_q[MAIN] with @@ -1059,11 +1049,8 @@ static int ext4_fc_perform_commit(journal_t *journal) list_for_each_entry(iter, &sbi->s_fc_q[FC_Q_MAIN], i_fc_list) { ext4_clear_inode_state(&iter->vfs_inode, EXT4_STATE_FC_FLUSHING_DATA); -#if (BITS_PER_LONG < 64) - wake_up_bit(&iter->i_state_flags, EXT4_STATE_FC_FLUSHING_DATA); -#else - wake_up_bit(&iter->i_flags, EXT4_STATE_FC_FLUSHING_DATA); -#endif + wake_up_bit(ext4_inode_state_wait_word(&iter->vfs_inode), + flushing_wait_bit); } /* @@ -1279,6 +1266,8 @@ static void ext4_fc_cleanup(journal_t *journal, int full, tid_t tid) struct ext4_inode_info *ei; struct ext4_fc_dentry_update *fc_dentry; int alloc_ctx; + int committing_wait_bit = + ext4_inode_state_wait_bit(EXT4_STATE_FC_COMMITTING); if (full && sbi->s_fc_bh) sbi->s_fc_bh = NULL; @@ -1315,11 +1304,8 @@ static void ext4_fc_cleanup(journal_t *journal, int full, tid_t tid) * barrier in prepare_to_wait() in ext4_fc_track_inode(). */ smp_mb(); -#if (BITS_PER_LONG < 64) - wake_up_bit(&ei->i_state_flags, EXT4_STATE_FC_COMMITTING); -#else - wake_up_bit(&ei->i_flags, EXT4_STATE_FC_COMMITTING); -#endif + wake_up_bit(ext4_inode_state_wait_word(&ei->vfs_inode), + committing_wait_bit); } while (!list_empty(&sbi->s_fc_dentry_q[FC_Q_MAIN])) {