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fs: dcache scale dentry refcount

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Make d_count non-atomic and protect it with d_lock. This allows us to ensure a
0 refcount dentry remains 0 without dcache_lock. It is also fairly natural when
we start protecting many other dentry members with d_lock.

Signed-off-by: Nick Piggin <[email protected]>
This commit is contained in:
Nick Piggin 2011-01-07 17:49:32 +11:00
commit b7ab39f631
21 changed files with 126 additions and 69 deletions
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2
fs/locks.c
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@ -1389,7 +1389,7 @@ int generic_setlease(struct file *filp, long arg, struct file_lock **flp)
if ((arg == F_RDLCK) && (atomic_read(&inode->i_writecount) > 0))
goto out;
if ((arg == F_WRLCK)
&& ((atomic_read(&dentry->d_count) > 1)
&& ((dentry->d_count > 1)
|| (atomic_read(&inode->i_count) > 1)))
goto out;
}