fs: create __sb_write_started() helper
Similar to sb_write_started() for use by other sb freeze levels. Unlike the boolean sb_write_started(), this helper returns a tristate to distiguish the cases of lockdep disabled or unknown lock state. This is needed for fanotify "pre content" events. Signed-off-by: Amir Goldstein <amir73il@gmail.com> Link: https://lore.kernel.org/r/20231122122715.2561213-15-amir73il@gmail.com Reviewed-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Christian Brauner <brauner@kernel.org>
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@ -1645,9 +1645,23 @@ static inline bool __sb_start_write_trylock(struct super_block *sb, int level)
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#define __sb_writers_release(sb, lev) \
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percpu_rwsem_release(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_)
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/**
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* __sb_write_started - check if sb freeze level is held
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* @sb: the super we write to
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* @level: the freeze level
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*
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* > 0 sb freeze level is held
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* 0 sb freeze level is not held
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* < 0 !CONFIG_LOCKDEP/LOCK_STATE_UNKNOWN
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*/
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static inline int __sb_write_started(const struct super_block *sb, int level)
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{
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return lockdep_is_held_type(sb->s_writers.rw_sem + level - 1, 1);
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}
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static inline bool sb_write_started(const struct super_block *sb)
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{
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return lockdep_is_held_type(sb->s_writers.rw_sem + SB_FREEZE_WRITE - 1, 1);
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return __sb_write_started(sb, SB_FREEZE_WRITE);
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}
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/**
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