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NFS: Optimise inode attribute cache updates

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Allow nfs_refresh_inode() also to update attributes on the inode if the
 RPC call was sent after the last call to nfs_update_inode().

 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2005-10-27 22:12:39 -04:00
parent 913a70fc17
commit 33801147a8
6 changed files with 44 additions and 20 deletions
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54
fs/nfs/inode.c
View file

@ -785,7 +785,8 @@ nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
else
init_special_inode(inode, inode->i_mode, fattr->rdev);
nfsi->read_cache_jiffies = fattr->timestamp;
nfsi->read_cache_jiffies = fattr->time_start;
nfsi->last_updated = jiffies;
inode->i_atime = fattr->atime;
inode->i_mtime = fattr->mtime;
inode->i_ctime = fattr->ctime;
@ -1120,14 +1121,15 @@ __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
goto out;
}
spin_lock(&inode->i_lock);
status = nfs_update_inode(inode, &fattr, verifier);
if (status) {
spin_unlock(&inode->i_lock);
dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
inode->i_sb->s_id,
(long long)NFS_FILEID(inode), status);
goto out;
}
spin_lock(&inode->i_lock);
cache_validity = nfsi->cache_validity;
nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
@ -1247,7 +1249,7 @@ void nfs_end_data_update(struct inode *inode)
}
/**
* nfs_refresh_inode - verify consistency of the inode attribute cache
* nfs_check_inode_attributes - verify consistency of the inode attribute cache
* @inode - pointer to inode
* @fattr - updated attributes
*
@ -1255,13 +1257,12 @@ void nfs_end_data_update(struct inode *inode)
* so that fattr carries weak cache consistency data, then it may
* also update the ctime/mtime/change_attribute.
*/
int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
{
struct nfs_inode *nfsi = NFS_I(inode);
loff_t cur_size, new_isize;
int data_unstable;
spin_lock(&inode->i_lock);
/* Are we in the process of updating data on the server? */
data_unstable = nfs_caches_unstable(inode);
@ -1325,11 +1326,40 @@ int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
if (!timespec_equal(&inode->i_atime, &fattr->atime))
nfsi->cache_validity |= NFS_INO_INVALID_ATIME;
nfsi->read_cache_jiffies = fattr->timestamp;
spin_unlock(&inode->i_lock);
nfsi->read_cache_jiffies = fattr->time_start;
return 0;
}
/**
* nfs_refresh_inode - try to update the inode attribute cache
* @inode - pointer to inode
* @fattr - updated attributes
*
* Check that an RPC call that returned attributes has not overlapped with
* other recent updates of the inode metadata, then decide whether it is
* safe to do a full update of the inode attributes, or whether just to
* call nfs_check_inode_attributes.
*/
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);
nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
if (nfs_verify_change_attribute(inode, fattr->time_start))
nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);
if (time_after(fattr->time_start, nfsi->last_updated))
status = nfs_update_inode(inode, fattr, fattr->time_start);
else
status = nfs_check_inode_attributes(inode, fattr);
spin_unlock(&inode->i_lock);
return status;
}
/*
* Many nfs protocol calls return the new file attributes after
* an operation. Here we update the inode to reflect the state
@ -1365,20 +1395,17 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr, unsign
goto out_err;
}
spin_lock(&inode->i_lock);
/*
* Make sure the inode's type hasn't changed.
*/
if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
spin_unlock(&inode->i_lock);
if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
goto out_changed;
}
/*
* Update the read time so we don't revalidate too often.
*/
nfsi->read_cache_jiffies = fattr->timestamp;
nfsi->read_cache_jiffies = fattr->time_start;
nfsi->last_updated = jiffies;
/* Are we racing with known updates of the metadata on the server? */
data_unstable = ! (nfs_verify_change_attribute(inode, verifier) ||
@ -1467,7 +1494,6 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr, unsign
if (!nfs_have_delegation(inode, FMODE_READ))
nfsi->cache_validity |= invalid;
spin_unlock(&inode->i_lock);
return 0;
out_changed:
/*