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fs: dcache per-inode inode alias locking

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dcache_inode_lock can be replaced with per-inode locking. Use existing
inode->i_lock for this. This is slightly non-trivial because we sometimes
need to find the inode from the dentry, which requires d_inode to be
stabilised (either with refcount or d_lock).

Signed-off-by: Nick Piggin <npiggin@kernel.dk>
This commit is contained in:
Nick Piggin
2011-01-07 17:50:06 +11:00
parent ceb5bdc2d2
commit 873feea09e
9 changed files with 67 additions and 60 deletions
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12
fs/exportfs/expfs.c
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@ -43,24 +43,26 @@ find_acceptable_alias(struct dentry *result,
void *context)
{
struct dentry *dentry, *toput = NULL;
struct inode *inode;
if (acceptable(context, result))
return result;
spin_lock(&dcache_inode_lock);
list_for_each_entry(dentry, &result->d_inode->i_dentry, d_alias) {
inode = result->d_inode;
spin_lock(&inode->i_lock);
list_for_each_entry(dentry, &inode->i_dentry, d_alias) {
dget(dentry);
spin_unlock(&dcache_inode_lock);
spin_unlock(&inode->i_lock);
if (toput)
dput(toput);
if (dentry != result && acceptable(context, dentry)) {
dput(result);
return dentry;
}
spin_lock(&dcache_inode_lock);
spin_lock(&inode->i_lock);
toput = dentry;
}
spin_unlock(&dcache_inode_lock);
spin_unlock(&inode->i_lock);
if (toput)
dput(toput);