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parallel lookups: actual switch to rwsem

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ta-da!

The main issue is the lack of down_write_killable(), so the places
like readdir.c switched to plain inode_lock(); once killable
variants of rwsem primitives appear, that'll be dealt with.

lockdep side also might need more work

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2016-04-15 15:08:36 -04:00
parent d9171b9345
commit 9902af79c0
11 changed files with 73 additions and 32 deletions
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27
include/linux/fs.h
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@@ -647,7 +647,7 @@ struct inode {
/* Misc */
unsigned long i_state;
struct mutex i_mutex;
struct rw_semaphore i_rwsem;
unsigned long dirtied_when; /* jiffies of first dirtying */
unsigned long dirtied_time_when;
@@ -734,27 +734,42 @@ enum inode_i_mutex_lock_class
static inline void inode_lock(struct inode *inode)
{
mutex_lock(&inode->i_mutex);
down_write(&inode->i_rwsem);
}
static inline void inode_unlock(struct inode *inode)
{
mutex_unlock(&inode->i_mutex);
up_write(&inode->i_rwsem);
}
static inline void inode_lock_shared(struct inode *inode)
{
down_read(&inode->i_rwsem);
}
static inline void inode_unlock_shared(struct inode *inode)
{
up_read(&inode->i_rwsem);
}
static inline int inode_trylock(struct inode *inode)
{
return mutex_trylock(&inode->i_mutex);
return down_write_trylock(&inode->i_rwsem);
}
static inline int inode_trylock_shared(struct inode *inode)
{
return down_read_trylock(&inode->i_rwsem);
}
static inline int inode_is_locked(struct inode *inode)
{
return mutex_is_locked(&inode->i_mutex);
return rwsem_is_locked(&inode->i_rwsem);
}
static inline void inode_lock_nested(struct inode *inode, unsigned subclass)
{
mutex_lock_nested(&inode->i_mutex, subclass);
down_write_nested(&inode->i_rwsem, subclass);
}
void lock_two_nondirectories(struct inode *, struct inode*);