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void nfs_bl_cache_invalidate(nfs_cache *nh)
{
unsigned long flags;
save_flags(flags);
cli();
if(nh->inuse)
nh->dead=1;
else
{
kfree_s(nh->data);
nh->data=NULL;
nh->free=1;
}
}
void nfs_bl_cache_revalidate(nfs_cache *nh, struct fattr fa)
{
nh->fattr=fattr;
nh->time=jiffies;
}
/*
* Find a block in the cache. We know the cache is block sized in block
* aligned space.
*/
nfs_cache *nfs_cache_find(struct inode *inode, off_t pos)
{
nfs_cache *nh=&nfs_cache_slot[0];
nfs_cache *ffree=NULL;
struct nfs_fattr fattr;
int ct=0;
while(ct<NH_CACHE_SIZE)
{
if(nh->inode_num==inode->i_no && !nh->dead&&!nh->free&&nh->file_pos==pos)
{
if(abs(jiffies-nh->time)<EXPIRE_CACHE)
return nh;
/*
* Revalidate
*/
if(nfs_proc_getattr(NFS_SERVER(inode), NFS_FH(inode), &fattr))
{
nfs_bl_cache_invalidate(nh);
continue; /* get attr failed */
}
if(nh->fattr.modified!=fattr.modified)
{
nfs_bl_cache_invalidate(nh);
continue; /* cache is out of date */
}
nfs_refresh_inode(inode, fattr);
nh->fattr=fattr;
nfs_bl_cache_revalidate(nh);
return nh;
}
if(nh->free)
ffree=nh;
}
return ffree;
}
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