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NFS: Improve handling of directory verifiers

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If the server insists on using the readdir verifiers in order to allow
cookies to expire, then we should ensure that we cache the verifier
with the cookie, so that we can return an error if the application
tries to use the expired cookie.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Tested-by: Benjamin Coddington <bcodding@redhat.com>
Tested-by: Dave Wysochanski <dwysocha@redhat.com>
This commit is contained in:
Trond Myklebust 2020-11-02 20:06:12 -05:00
parent 9fff59ed4c
commit b593c09f83
3 changed files with 30 additions and 20 deletions
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8
include/linux/nfs_fs.h
View file

@ -45,6 +45,11 @@
*/
#define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
/*
* Size of the NFS directory verifier
*/
#define NFS_DIR_VERIFIER_SIZE 2
/*
* NFSv3/v4 Access mode cache entry
*/
@ -89,6 +94,7 @@ struct nfs_open_context {
struct nfs_open_dir_context {
struct list_head list;
unsigned long attr_gencount;
__be32 verf[NFS_DIR_VERIFIER_SIZE];
__u64 dir_cookie;
__u64 dup_cookie;
signed char duped;
@ -156,7 +162,7 @@ struct nfs_inode {
* This is the cookie verifier used for NFSv3 readdir
* operations
*/
__be32 cookieverf[2];
__be32 cookieverf[NFS_DIR_VERIFIER_SIZE];
atomic_long_t nrequests;
struct nfs_mds_commit_info commit_info;