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authorTrond Myklebust <Trond.Myklebust@netapp.com>2008-10-14 19:16:07 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2008-10-14 19:23:17 -0400
commit4704f0e274829e3af00737d2d9adace2d71a9605 (patch)
tree048404f927dc210f1d7c695cb39e28e4e7d49030 /include
parent921615f111108258820226a3258a047d9bf1d96a (diff)
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NFS: Fix the resolution problem with nfs_inode_attrs_need_update()
It appears that 'jiffies' timestamps do not have high enough resolution for nfs_inode_attrs_need_update(). One problem is that a GETATTR can be launched within < 1 jiffy of the last operation that updated the attribute. Another problem is that RPC calls can take < 1 jiffy to execute. We can fix this by switching the variables to use a simple global counter that gets incremented every time we start another GETATTR call. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/nfs_fs.h10
-rw-r--r--include/linux/nfs_xdr.h1
2 files changed, 4 insertions, 7 deletions
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index ca563ee13e3..ac8d0233b05 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -137,7 +137,7 @@ struct nfs_inode {
unsigned long attrtimeo_timestamp;
__u64 change_attr; /* v4 only */
- unsigned long last_updated;
+ unsigned long attr_gencount;
/* "Generation counter" for the attribute cache. This is
* bumped whenever we update the metadata on the
* server.
@@ -344,15 +344,11 @@ extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ct
extern void put_nfs_open_context(struct nfs_open_context *ctx);
extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode);
extern u64 nfs_compat_user_ino64(u64 fileid);
+extern void nfs_fattr_init(struct nfs_fattr *fattr);
/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
extern __be32 root_nfs_parse_addr(char *name); /*__init*/
-
-static inline void nfs_fattr_init(struct nfs_fattr *fattr)
-{
- fattr->valid = 0;
- fattr->time_start = jiffies;
-}
+extern unsigned long nfs_inc_attr_generation_counter(void);
/*
* linux/fs/nfs/file.c
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 6ee6ae3f095..c1c31acb8a2 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -56,6 +56,7 @@ struct nfs_fattr {
__u64 change_attr; /* NFSv4 change attribute */
__u64 pre_change_attr;/* pre-op NFSv4 change attribute */
unsigned long time_start;
+ unsigned long gencount;
};
#define NFS_ATTR_WCC 0x0001 /* pre-op WCC data */