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NFS: Optimise inode attribute cache updates 

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:
/*

1
fs/nfs/nfs2xdr.c
View File

@ -143,7 +143,6 @@ xdr_decode_fattr(u32 *p, struct nfs_fattr *fattr)
fattr->mode = (fattr->mode & ~S_IFMT) | S_IFIFO;
fattr->rdev = 0;
}
fattr->timestamp = jiffies;
return p;
}

1
fs/nfs/nfs3xdr.c
View File

@ -174,7 +174,6 @@ xdr_decode_fattr(u32 *p, struct nfs_fattr *fattr)
/* Update the mode bits */
fattr->valid |= (NFS_ATTR_FATTR | NFS_ATTR_FATTR_V3);
fattr->timestamp = jiffies;
return p;
}

4
fs/nfs/nfs4xdr.c
View File

@ -2799,10 +2799,8 @@ static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr, cons
goto xdr_error;
if ((status = decode_attr_time_modify(xdr, bitmap, &fattr->mtime)) != 0)
goto xdr_error;
if ((status = verify_attr_len(xdr, savep, attrlen)) == 0) {
if ((status = verify_attr_len(xdr, savep, attrlen)) == 0)
fattr->valid = NFS_ATTR_FATTR | NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4;
fattr->timestamp = jiffies;
}
xdr_error:
if (status != 0)
printk(KERN_NOTICE "%s: xdr error %d!\n", __FUNCTION__, -status);

2
include/linux/nfs_fs.h
View File

@ -141,6 +141,7 @@ struct nfs_inode {
unsigned long attrtimeo_timestamp;
__u64 change_attr; /* v4 only */
unsigned long last_updated;
/* "Generation counter" for the attribute cache. This is
* bumped whenever we update the metadata on the
* server.
@ -319,6 +320,7 @@ extern u32 root_nfs_parse_addr(char *name); /*__init*/
static inline void nfs_fattr_init(struct nfs_fattr *fattr)
{
fattr->valid = 0;
fattr->time_start = jiffies;
}
/*

2
include/linux/nfs_xdr.h
View File

@ -41,7 +41,7 @@ struct nfs_fattr {
__u32 bitmap[2]; /* NFSv4 returned attribute bitmap */
__u64 change_attr; /* NFSv4 change attribute */
__u64 pre_change_attr;/* pre-op NFSv4 change attribute */
unsigned long timestamp;
unsigned long time_start;
};
#define NFS_ATTR_WCC 0x0001 /* pre-op WCC data */