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Subject[RFC 4/5] nfs, support pathconf(3) with _PC_LINK_MAX
Date
Return the value via struct statfs.f_spare[0], based upon PATHCONF
procedure. As namemax, it is set to a new member in struct nfs_server,
named linkmax.
Since NFSv2 (v4 too?) doesn't have PATHCONF procedure, it will be set to
LINK_MAX_DEFAULT which is a default value of GLibc implementation.

Signed-off-by: J. R. Okajima <hooanon05@yahoo.co.jp>
---
fs/nfs/client.c | 10 +++++++---
fs/nfs/super.c | 1 +
include/linux/nfs_fs_sb.h | 1 +
3 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 99ea196..ed3fddd 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -851,6 +851,7 @@ static int nfs_init_server(struct nfs_server *server,
server->mountd_protocol = data->mount_server.protocol;

server->namelen = data->namlen;
+ server->linkmax = LINK_MAX_DEFAULT;
/* Create a client RPC handle for the NFSv3 ACL management interface */
nfs_init_server_aclclient(server);
dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
@@ -941,14 +942,17 @@ static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, str
nfs_server_set_fsinfo(server, &fsinfo);

/* Get some general file system info */
- if (server->namelen == 0) {
+ {
struct nfs_pathconf pathinfo;

pathinfo.fattr = fattr;
nfs_fattr_init(fattr);

- if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
- server->namelen = pathinfo.max_namelen;
+ if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) {
+ if (server->namelen == 0)
+ server->namelen = pathinfo.max_namelen;
+ server->linkmax = pathinfo.max_link;
+ }
}

dprintk("<-- nfs_probe_fsinfo() = 0\n");
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 90be551..ae0599c 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -453,6 +453,7 @@ static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
buf->f_ffree = res.afiles;

buf->f_namelen = server->namelen;
+ buf->f_linkmax = server->linkmax;

return 0;

diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 320569e..d66ab43 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -123,6 +123,7 @@ struct nfs_server {
unsigned int acdirmin;
unsigned int acdirmax;
unsigned int namelen;
+ unsigned int linkmax;
unsigned int options; /* extra options enabled by mount */
#define NFS_OPTION_FSCACHE 0x00000001 /* - local caching enabled */

--
1.6.1.284.g5dc13


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