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fs: change d_delete semantics

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Change d_delete from a dentry deletion notification to a dentry caching
advise, more like ->drop_inode. Require it to be constant and idempotent,
and not take d_lock. This is how all existing filesystems use the callback
anyway.

This makes fine grained dentry locking of dput and dentry lru scanning
much simpler.

Signed-off-by: Nick Piggin <npiggin@kernel.dk>
This commit is contained in:
Nick Piggin
2011-01-07 17:49:23 +11:00
parent 5eef7fa905
commit fe15ce446b
22 changed files with 47 additions and 42 deletions
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fs/dcache.c
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@@ -453,8 +453,6 @@ static void prune_one_dentry(struct dentry * dentry)
if (!atomic_dec_and_lock(&dentry->d_count, &dentry->d_lock))
return;
if (dentry->d_op && dentry->d_op->d_delete)
dentry->d_op->d_delete(dentry);
dentry_lru_del(dentry);
__d_drop(dentry);
dentry = d_kill(dentry);