Read the max read/write sizes supported when connecting to NFS

and store in the nfs context.
Privide accessor functions to read the max sizes.

diff --git a/include/libnfs.h b/include/libnfs.h
index 2debb8b7660e9a6130e1b50bd920c47a9081e478..8defc101acf3a7f6a676e2508cfac27cdcc3aa09 100644 (file)
--- a/include/libnfs.h
+++ b/include/libnfs.h
@@ -67,6 +67,16 @@ void nfs_destroy_context(struct nfs_context *nfs);
 
 struct nfsfh;
 
+/*
+ * Get the maximum supported READ3 size by the server
+ */
+size_t nfs_get_readmax(struct nfs_context *nfs);
+
+/*
+ * Get the maximum supported WRITE3 size by the server
+ */
+size_t nfs_get_writemax(struct nfs_context *nfs);
+
 
 /*
  * MOUNT THE EXPORT

diff --git a/lib/libnfs.c b/lib/libnfs.c
index f4e8b0136c5b53b171cb4807153f00c19d3e3736..06eea35a343c9a3d63a0bfe72f02b3761bd85131 100644 (file)
--- a/lib/libnfs.c
+++ b/lib/libnfs.c
@@ -63,6 +63,8 @@ struct nfs_context {
        char *server;
        char *export;
        struct nfs_fh3 rootfh;
+       size_t readmax;
+       size_t writemax;
 };
 
 struct nfs_cb_data;
@@ -178,7 +180,7 @@ void free_nfs_cb_data(struct nfs_cb_data *data)
 
 
 
-static void nfs_mount_9_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_mount_10_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
 {
        struct nfs_cb_data *data = private_data;
        struct nfs_context *nfs = data->nfs;
@@ -198,10 +200,11 @@ static void nfs_mount_9_cb(struct rpc_context *rpc _U_, int status, void *comman
        free_nfs_cb_data(data);
 }
 
-static void nfs_mount_8_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
+static void nfs_mount_9_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
        struct nfs_cb_data *data = private_data;
        struct nfs_context *nfs = data->nfs;
+       FSINFO3res *res = command_data;
 
        if (status == RPC_STATUS_ERROR) {
                data->cb(-EFAULT, nfs, command_data, data->private_data);
@@ -214,14 +217,40 @@ static void nfs_mount_8_cb(struct rpc_context *rpc, int status, void *command_da
                return;
        }
 
+       nfs->readmax = res->FSINFO3res_u.resok.rtmax;
+       nfs->writemax = res->FSINFO3res_u.resok.wtmax;
 
-       if (rpc_nfs_getattr_async(rpc, nfs_mount_9_cb, &nfs->rootfh, data) != 0) {
+       if (rpc_nfs_getattr_async(rpc, nfs_mount_10_cb, &nfs->rootfh, data) != 0) {
                data->cb(-ENOMEM, nfs, command_data, data->private_data);
                free_nfs_cb_data(data);
                return;
        }
 }
 
+static void nfs_mount_8_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
+{
+       struct nfs_cb_data *data = private_data;
+       struct nfs_context *nfs = data->nfs;
+
+       if (status == RPC_STATUS_ERROR) {
+               data->cb(-EFAULT, nfs, command_data, data->private_data);
+               free_nfs_cb_data(data);
+               return;
+       }
+       if (status == RPC_STATUS_CANCEL) {
+               data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
+               free_nfs_cb_data(data);
+               return;
+       }
+
+       if (rpc_nfs_fsinfo_async(rpc, nfs_mount_9_cb, &nfs->rootfh, data) != 0) {
+               data->cb(-ENOMEM, nfs, command_data, data->private_data);
+               free_nfs_cb_data(data);
+               return;
+       }
+}
+
+
 static void nfs_mount_7_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
        struct nfs_cb_data *data = private_data;
@@ -2703,3 +2732,20 @@ off_t nfs_get_current_offset(struct nfsfh *nfsfh)
        return nfsfh->offset;
 }
 
+
+
+/*
+ * Get the maximum supported READ3 size by the server
+ */
+size_t nfs_get_readmax(struct nfs_context *nfs)
+{
+       return nfs->readmax;
+}
+
+/*
+ * Get the maximum supported WRITE3 size by the server
+ */
+size_t nfs_get_writemax(struct nfs_context *nfs)
+{
+       return nfs->writemax;
+}