forked from rrcarlosr/Jetpack
110 lines
2.9 KiB
Diff
110 lines
2.9 KiB
Diff
From ef0636bb35becb1c5c671d3077972e573916679e Mon Sep 17 00:00:00 2001
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From: Thomas Gleixner <tglx@linutronix.de>
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Date: Fri, 18 Mar 2011 10:11:25 +0100
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Subject: [PATCH 094/352] fs: jbd/jbd2: Make state lock and journal head lock
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rt safe
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bit_spin_locks break under RT.
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Based on a previous patch from Steven Rostedt <rostedt@goodmis.org>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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--
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include/linux/buffer_head.h | 8 ++++++++
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include/linux/jbd2.h | 24 ++++++++++++++++++++++++
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2 files changed, 32 insertions(+)
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---
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include/linux/buffer_head.h | 8 ++++++++
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include/linux/jbd2.h | 24 ++++++++++++++++++++++++
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2 files changed, 32 insertions(+)
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diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
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index 87c4ed3..0744157 100644
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--- a/include/linux/buffer_head.h
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+++ b/include/linux/buffer_head.h
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@@ -77,6 +77,10 @@ struct buffer_head {
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atomic_t b_count; /* users using this buffer_head */
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#ifdef CONFIG_PREEMPT_RT_BASE
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spinlock_t b_uptodate_lock;
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+#if IS_ENABLED(CONFIG_JBD2)
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+ spinlock_t b_state_lock;
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+ spinlock_t b_journal_head_lock;
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+#endif
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#endif
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};
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@@ -108,6 +112,10 @@ static inline void buffer_head_init_locks(struct buffer_head *bh)
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{
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#ifdef CONFIG_PREEMPT_RT_BASE
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spin_lock_init(&bh->b_uptodate_lock);
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+#if IS_ENABLED(CONFIG_JBD2)
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+ spin_lock_init(&bh->b_state_lock);
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+ spin_lock_init(&bh->b_journal_head_lock);
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+#endif
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#endif
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}
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diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
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index d073470..9118fda 100644
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--- a/include/linux/jbd2.h
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+++ b/include/linux/jbd2.h
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@@ -347,32 +347,56 @@ static inline struct journal_head *bh2jh(struct buffer_head *bh)
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static inline void jbd_lock_bh_state(struct buffer_head *bh)
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{
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+#ifndef CONFIG_PREEMPT_RT_BASE
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bit_spin_lock(BH_State, &bh->b_state);
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+#else
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+ spin_lock(&bh->b_state_lock);
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+#endif
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}
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static inline int jbd_trylock_bh_state(struct buffer_head *bh)
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{
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+#ifndef CONFIG_PREEMPT_RT_BASE
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return bit_spin_trylock(BH_State, &bh->b_state);
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+#else
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+ return spin_trylock(&bh->b_state_lock);
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+#endif
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}
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static inline int jbd_is_locked_bh_state(struct buffer_head *bh)
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{
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+#ifndef CONFIG_PREEMPT_RT_BASE
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return bit_spin_is_locked(BH_State, &bh->b_state);
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+#else
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+ return spin_is_locked(&bh->b_state_lock);
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+#endif
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}
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static inline void jbd_unlock_bh_state(struct buffer_head *bh)
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{
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+#ifndef CONFIG_PREEMPT_RT_BASE
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bit_spin_unlock(BH_State, &bh->b_state);
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+#else
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+ spin_unlock(&bh->b_state_lock);
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+#endif
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}
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static inline void jbd_lock_bh_journal_head(struct buffer_head *bh)
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{
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+#ifndef CONFIG_PREEMPT_RT_BASE
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bit_spin_lock(BH_JournalHead, &bh->b_state);
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+#else
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+ spin_lock(&bh->b_journal_head_lock);
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+#endif
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}
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static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh)
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{
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+#ifndef CONFIG_PREEMPT_RT_BASE
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bit_spin_unlock(BH_JournalHead, &bh->b_state);
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+#else
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+ spin_unlock(&bh->b_journal_head_lock);
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+#endif
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}
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#define J_ASSERT(assert) BUG_ON(!(assert))
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--
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2.7.4
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