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authorTrond Myklebust <trond.myklebust@primarydata.com>2015-09-05 19:06:57 -0400
committerTrond Myklebust <trond.myklebust@primarydata.com>2015-09-07 12:36:13 -0400
commit7d160a6c462c2c690e074c173b43aad7204049ad (patch)
tree6967b9cffa27592690259622031e87e27919d61b
parent4eae50143bcbfda819c650b7ed6739f3b6338ffc (diff)
downloadlinux-linaro-stable-7d160a6c462c2c690e074c173b43aad7204049ad.tar.gz
NFSv4: Express delegation limit in units of pages
Since we're tracking modifications to the page cache on a per-page basis, it makes sense to express the limit to how much we may cache in units of pages. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
-rw-r--r--fs/nfs/delegation.c4
-rw-r--r--fs/nfs/delegation.h2
-rw-r--r--fs/nfs/nfs4xdr.c16
-rw-r--r--include/linux/nfs_xdr.h2
4 files changed, 14 insertions, 10 deletions
diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index 029d688a969f..cd503cc2251c 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -175,7 +175,7 @@ void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred,
if (delegation->inode != NULL) {
nfs4_stateid_copy(&delegation->stateid, &res->delegation);
delegation->type = res->delegation_type;
- delegation->maxsize = res->maxsize;
+ delegation->pagemod_limit = res->pagemod_limit;
oldcred = delegation->cred;
delegation->cred = get_rpccred(cred);
clear_bit(NFS_DELEGATION_NEED_RECLAIM,
@@ -337,7 +337,7 @@ int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct
return -ENOMEM;
nfs4_stateid_copy(&delegation->stateid, &res->delegation);
delegation->type = res->delegation_type;
- delegation->maxsize = res->maxsize;
+ delegation->pagemod_limit = res->pagemod_limit;
delegation->change_attr = inode->i_version;
delegation->cred = get_rpccred(cred);
delegation->inode = inode;
diff --git a/fs/nfs/delegation.h b/fs/nfs/delegation.h
index e3c20a3ccc93..554178a17376 100644
--- a/fs/nfs/delegation.h
+++ b/fs/nfs/delegation.h
@@ -18,7 +18,7 @@ struct nfs_delegation {
struct inode *inode;
nfs4_stateid stateid;
fmode_t type;
- loff_t maxsize;
+ unsigned long pagemod_limit;
__u64 change_attr;
unsigned long flags;
spinlock_t lock;
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index ff4784c54e04..788adf3897c7 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -4932,24 +4932,28 @@ static int decode_lookup(struct xdr_stream *xdr)
}
/* This is too sick! */
-static int decode_space_limit(struct xdr_stream *xdr, u64 *maxsize)
+static int decode_space_limit(struct xdr_stream *xdr,
+ unsigned long *pagemod_limit)
{
__be32 *p;
uint32_t limit_type, nblocks, blocksize;
+ u64 maxsize = 0;
p = xdr_inline_decode(xdr, 12);
if (unlikely(!p))
goto out_overflow;
limit_type = be32_to_cpup(p++);
switch (limit_type) {
- case 1:
- xdr_decode_hyper(p, maxsize);
+ case NFS4_LIMIT_SIZE:
+ xdr_decode_hyper(p, &maxsize);
break;
- case 2:
+ case NFS4_LIMIT_BLOCKS:
nblocks = be32_to_cpup(p++);
blocksize = be32_to_cpup(p);
- *maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
+ maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
}
+ maxsize >>= PAGE_CACHE_SHIFT;
+ *pagemod_limit = min_t(u64, maxsize, ULONG_MAX);
return 0;
out_overflow:
print_overflow_msg(__func__, xdr);
@@ -4977,7 +4981,7 @@ static int decode_rw_delegation(struct xdr_stream *xdr,
break;
case NFS4_OPEN_DELEGATE_WRITE:
res->delegation_type = FMODE_WRITE|FMODE_READ;
- if (decode_space_limit(xdr, &res->maxsize) < 0)
+ if (decode_space_limit(xdr, &res->pagemod_limit) < 0)
return -EIO;
}
return decode_ace(xdr, NULL, res->server->nfs_client);
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index b4392d86d157..52faf7e96c65 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -406,8 +406,8 @@ struct nfs_openres {
const struct nfs_server *server;
fmode_t delegation_type;
nfs4_stateid delegation;
+ unsigned long pagemod_limit;
__u32 do_recall;
- __u64 maxsize;
__u32 attrset[NFS4_BITMAP_SIZE];
struct nfs4_string *owner;
struct nfs4_string *group_owner;