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dax: Fix deadlock in dax_lock_mapping_entry()
When dax_lock_mapping_entry() has to sleep to obtain entry lock, it will
fail to unlock mapping->i_pages spinlock and thus immediately deadlock
against itself when retrying to grab the entry lock again. Fix the
problem by unlocking mapping->i_pages before retrying.
Fixes: c2a7d2a115
("filesystem-dax: Introduce dax_lock_mapping_entry()")
Reported-by: Barret Rhoden <brho@google.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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1 changed files with 1 additions and 0 deletions
1
fs/dax.c
1
fs/dax.c
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@ -447,6 +447,7 @@ bool dax_lock_mapping_entry(struct page *page)
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xa_unlock_irq(&mapping->i_pages);
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break;
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} else if (IS_ERR(entry)) {
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xa_unlock_irq(&mapping->i_pages);
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WARN_ON_ONCE(PTR_ERR(entry) != -EAGAIN);
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continue;
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}
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