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authorTrond Myklebust <trond.myklebust@hammerspace.com>2021-03-26 11:01:19 -0400
committerTrond Myklebust <trond.myklebust@hammerspace.com>2021-04-13 10:04:05 -0400
commit6f9be83d07615e6af8838a1d489080b399f42a08 (patch)
tree9f82c25a97a52c8f1b0afb158f664acbe5610ead /fs/nfs/inode.c
parent7f08a3359a3c1e39c2a118fbbe583d8c8db14ace (diff)
NFS: Use information about the change attribute to optimise updates
If the NFSv4.2 server supports the 'change_attr_type' attribute, then allow the client to optimise its attribute cache update strategy. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'fs/nfs/inode.c')
-rw-r--r--fs/nfs/inode.c111
1 files changed, 93 insertions, 18 deletions
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index fc8e92794636..d218d164414f 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1657,25 +1657,20 @@ EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
#endif
/**
- * nfs_inode_attrs_need_update - check if the inode attributes need updating
- * @inode: pointer to inode
+ * nfs_inode_attrs_cmp_generic - compare attributes
* @fattr: attributes
+ * @inode: pointer to inode
*
* Attempt to divine whether or not an RPC call reply carrying stale
* attributes got scheduled after another call carrying updated ones.
- *
- * To do so, the function first assumes that a more recent ctime means
- * that the attributes in fattr are newer, however it also attempt to
- * catch the case where ctime either didn't change, or went backwards
- * (if someone reset the clock on the server) by looking at whether
- * or not this RPC call was started after the inode was last updated.
* Note also the check for wraparound of 'attr_gencount'
*
- * The function returns 'true' if it thinks the attributes in 'fattr' are
- * more recent than the ones cached in the inode.
- *
+ * The function returns '1' if it thinks the attributes in @fattr are
+ * more recent than the ones cached in @inode. Otherwise it returns
+ * the value '0'.
*/
-static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
+static int nfs_inode_attrs_cmp_generic(const struct nfs_fattr *fattr,
+ const struct inode *inode)
{
unsigned long attr_gencount = NFS_I(inode)->attr_gencount;
@@ -1683,15 +1678,93 @@ static int nfs_inode_attrs_need_update(const struct inode *inode, const struct n
(long)(attr_gencount - nfs_read_attr_generation_counter()) > 0;
}
-static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
+/**
+ * nfs_inode_attrs_cmp_monotonic - compare attributes
+ * @fattr: attributes
+ * @inode: pointer to inode
+ *
+ * Attempt to divine whether or not an RPC call reply carrying stale
+ * attributes got scheduled after another call carrying updated ones.
+ *
+ * We assume that the server observes monotonic semantics for
+ * the change attribute, so a larger value means that the attributes in
+ * @fattr are more recent, in which case the function returns the
+ * value '1'.
+ * A return value of '0' indicates no measurable change
+ * A return value of '-1' means that the attributes in @inode are
+ * more recent.
+ */
+static int nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr *fattr,
+ const struct inode *inode)
{
- int ret;
+ s64 diff = fattr->change_attr - inode_peek_iversion_raw(inode);
+ if (diff > 0)
+ return 1;
+ return diff == 0 ? 0 : -1;
+}
+
+/**
+ * nfs_inode_attrs_cmp_strict_monotonic - compare attributes
+ * @fattr: attributes
+ * @inode: pointer to inode
+ *
+ * Attempt to divine whether or not an RPC call reply carrying stale
+ * attributes got scheduled after another call carrying updated ones.
+ *
+ * We assume that the server observes strictly monotonic semantics for
+ * the change attribute, so a larger value means that the attributes in
+ * @fattr are more recent, in which case the function returns the
+ * value '1'.
+ * A return value of '-1' means that the attributes in @inode are
+ * more recent or unchanged.
+ */
+static int nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr *fattr,
+ const struct inode *inode)
+{
+ return nfs_inode_attrs_cmp_monotonic(fattr, inode) > 0 ? 1 : -1;
+}
+
+/**
+ * nfs_inode_attrs_cmp - compare attributes
+ * @fattr: attributes
+ * @inode: pointer to inode
+ *
+ * This function returns '1' if it thinks the attributes in @fattr are
+ * more recent than the ones cached in @inode. It returns '-1' if
+ * the attributes in @inode are more recent than the ones in @fattr,
+ * and it returns 0 if not sure.
+ */
+static int nfs_inode_attrs_cmp(const struct nfs_fattr *fattr,
+ const struct inode *inode)
+{
+ if (nfs_inode_attrs_cmp_generic(fattr, inode) > 0)
+ return 1;
+ switch (NFS_SERVER(inode)->change_attr_type) {
+ case NFS4_CHANGE_TYPE_IS_UNDEFINED:
+ break;
+ case NFS4_CHANGE_TYPE_IS_TIME_METADATA:
+ if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
+ break;
+ return nfs_inode_attrs_cmp_monotonic(fattr, inode);
+ default:
+ if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
+ break;
+ return nfs_inode_attrs_cmp_strict_monotonic(fattr, inode);
+ }
+ return 0;
+}
+
+static int nfs_refresh_inode_locked(struct inode *inode,
+ struct nfs_fattr *fattr)
+{
+ int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
+ int ret = 0;
trace_nfs_refresh_inode_enter(inode);
- if (nfs_inode_attrs_need_update(inode, fattr))
+ if (attr_cmp > 0)
ret = nfs_update_inode(inode, fattr);
- else
+ else if (attr_cmp == 0)
ret = nfs_check_inode_attributes(inode, fattr);
trace_nfs_refresh_inode_exit(inode, ret);
@@ -1776,11 +1849,13 @@ EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
*/
int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
{
+ int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
int status;
/* Don't do a WCC update if these attributes are already stale */
- if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
- !nfs_inode_attrs_need_update(inode, fattr)) {
+ if (attr_cmp < 0)
+ return 0;
+ if ((fattr->valid & NFS_ATTR_FATTR) == 0 || !attr_cmp) {
fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
| NFS_ATTR_FATTR_PRESIZE
| NFS_ATTR_FATTR_PREMTIME