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NFS: Clean up nfs_refresh_inode() and nfs_post_op_update_inode() 

Try to avoid taking and dropping the inode->i_lock more than once. Do so by
moving the code in nfs_refresh_inode() that needs to be done under the
spinlock into a function nfs_refresh_inode_locked(), and then having both
nfs_refresh_inode() and nfs_post_op_update_inode() call it directly.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2008-10-05 12:07:23 -04:00
parent 7973c1f15a
commit 870a5be8b9
1 changed files with 14 additions and 7 deletions
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21
fs/nfs/inode.c
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@ -948,6 +948,15 @@ static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fat
return 0;
}
static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
{
struct nfs_inode *nfsi = NFS_I(inode);
if (time_after(fattr->time_start, nfsi->last_updated))
return nfs_update_inode(inode, fattr);
return nfs_check_inode_attributes(inode, fattr);
}
/**
* nfs_refresh_inode - try to update the inode attribute cache
* @inode - pointer to inode
@ -960,17 +969,12 @@ static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fat
*/
int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
{
struct nfs_inode *nfsi = NFS_I(inode);
int status;
if ((fattr->valid & NFS_ATTR_FATTR) == 0)
return 0;
spin_lock(&inode->i_lock);
if (time_after(fattr->time_start, nfsi->last_updated))
status = nfs_update_inode(inode, fattr);
else
status = nfs_check_inode_attributes(inode, fattr);
status = nfs_refresh_inode_locked(inode, fattr);
spin_unlock(&inode->i_lock);
return status;
}
@ -992,13 +996,16 @@ int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
{
struct nfs_inode *nfsi = NFS_I(inode);
int status = 0;
spin_lock(&inode->i_lock);
nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
if (S_ISDIR(inode->i_mode))
nfsi->cache_validity |= NFS_INO_INVALID_DATA;
if ((fattr->valid & NFS_ATTR_FATTR) != 0)
status = nfs_refresh_inode_locked(inode, fattr);
spin_unlock(&inode->i_lock);
return nfs_refresh_inode(inode, fattr);
return status;
}
/**