Commit c3e9f888 authored by David Howells's avatar David Howells

afs: Implement client support for the YFSVL.GetCellName RPC op

Implement client support for the YFSVL.GetCellName RPC operation by which
YFS permits the canonical cell name to be queried from a VL server.
Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
parent 194d28cf
......@@ -10,7 +10,7 @@
#include <linux/in.h>
#define AFS_MAXCELLNAME 64 /* Maximum length of a cell name */
#define AFS_MAXCELLNAME 256 /* Maximum length of a cell name */
#define AFS_MAXVOLNAME 64 /* Maximum length of a volume name */
#define AFS_MAXNSERVERS 8 /* Maximum servers in a basic volume record */
#define AFS_NMAXNSERVERS 13 /* Maximum servers in a N/U-class volume record */
......
......@@ -22,6 +22,7 @@ enum AFSVL_Operations {
VLGETENTRYBYNAMEU = 527, /* AFS Get VLDB entry by name (UUID-variant) */
VLGETADDRSU = 533, /* AFS Get addrs for fileserver */
YVLGETENDPOINTS = 64002, /* YFS Get endpoints for file/volume server */
YVLGETCELLNAME = 64014, /* YFS Get actual cell name */
VLGETCAPABILITIES = 65537, /* AFS Get server capabilities */
};
......
......@@ -116,6 +116,7 @@ struct afs_call {
long ret0; /* Value to reply with instead of 0 */
struct afs_addr_list *ret_alist;
struct afs_vldb_entry *ret_vldb;
char *ret_str;
};
struct afs_operation *op;
unsigned int server_index;
......@@ -1373,6 +1374,7 @@ extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uu
extern struct afs_call *afs_vl_get_capabilities(struct afs_net *, struct afs_addr_cursor *,
struct key *, struct afs_vlserver *, unsigned int);
extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *);
extern char *afs_yfsvl_get_cell_name(struct afs_vl_cursor *);
/*
* vl_probe.c
......
......@@ -645,3 +645,114 @@ struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *vc,
afs_make_call(&vc->ac, call, GFP_KERNEL);
return (struct afs_addr_list *)afs_wait_for_call_to_complete(call, &vc->ac);
}
/*
* Deliver reply data to a YFSVL.GetCellName operation.
*/
static int afs_deliver_yfsvl_get_cell_name(struct afs_call *call)
{
char *cell_name;
u32 namesz, paddedsz;
int ret;
_enter("{%u,%zu/%u}",
call->unmarshall, iov_iter_count(call->iter), call->count);
switch (call->unmarshall) {
case 0:
afs_extract_to_tmp(call);
call->unmarshall++;
/* Fall through - and extract the cell name length */
case 1:
ret = afs_extract_data(call, true);
if (ret < 0)
return ret;
namesz = ntohl(call->tmp);
if (namesz > AFS_MAXCELLNAME)
return afs_protocol_error(call, afs_eproto_cellname_len);
paddedsz = (namesz + 3) & ~3;
call->count = namesz;
call->count2 = paddedsz - namesz;
cell_name = kmalloc(namesz + 1, GFP_KERNEL);
if (!cell_name)
return -ENOMEM;
cell_name[namesz] = 0;
call->ret_str = cell_name;
afs_extract_begin(call, cell_name, namesz);
call->unmarshall++;
/* Fall through - and extract cell name */
case 2:
ret = afs_extract_data(call, true);
if (ret < 0)
return ret;
afs_extract_discard(call, call->count2);
call->unmarshall++;
/* Fall through - and extract padding */
case 3:
ret = afs_extract_data(call, false);
if (ret < 0)
return ret;
call->unmarshall++;
break;
}
_leave(" = 0 [done]");
return 0;
}
static void afs_destroy_yfsvl_get_cell_name(struct afs_call *call)
{
kfree(call->ret_str);
afs_flat_call_destructor(call);
}
/*
* VL.GetCapabilities operation type
*/
static const struct afs_call_type afs_YFSVLGetCellName = {
.name = "YFSVL.GetCellName",
.op = afs_YFSVL_GetCellName,
.deliver = afs_deliver_yfsvl_get_cell_name,
.destructor = afs_destroy_yfsvl_get_cell_name,
};
/*
* Probe a volume server for the capabilities that it supports. This can
* return up to 196 words.
*
* We use this to probe for service upgrade to determine what the server at the
* other end supports.
*/
char *afs_yfsvl_get_cell_name(struct afs_vl_cursor *vc)
{
struct afs_call *call;
struct afs_net *net = vc->cell->net;
__be32 *bp;
_enter("");
call = afs_alloc_flat_call(net, &afs_YFSVLGetCellName, 1 * 4, 0);
if (!call)
return ERR_PTR(-ENOMEM);
call->key = vc->key;
call->ret_str = NULL;
call->max_lifespan = AFS_VL_MAX_LIFESPAN;
/* marshall the parameters */
bp = call->request;
*bp++ = htonl(YVLGETCELLNAME);
/* Can't take a ref on server */
trace_afs_make_vl_call(call);
afs_make_call(&vc->ac, call, GFP_KERNEL);
return (char *)afs_wait_for_call_to_complete(call, &vc->ac);
}
......@@ -111,6 +111,7 @@ enum afs_vl_operation {
afs_VL_GetEntryByNameU = 527, /* AFS Get Vol Entry By Name operation ID */
afs_VL_GetAddrsU = 533, /* AFS Get FS server addresses */
afs_YFSVL_GetEndpoints = 64002, /* YFS Get FS & Vol server addresses */
afs_YFSVL_GetCellName = 64014, /* YFS Get actual cell name */
afs_VL_GetCapabilities = 65537, /* AFS Get VL server capabilities */
};
......@@ -143,6 +144,7 @@ enum afs_eproto_cause {
afs_eproto_bad_status,
afs_eproto_cb_count,
afs_eproto_cb_fid_count,
afs_eproto_cellname_len,
afs_eproto_file_type,
afs_eproto_ibulkst_cb_count,
afs_eproto_ibulkst_count,
......@@ -316,6 +318,7 @@ enum afs_cb_break_reason {
EM(afs_VL_GetEntryByNameU, "VL.GetEntryByNameU") \
EM(afs_VL_GetAddrsU, "VL.GetAddrsU") \
EM(afs_YFSVL_GetEndpoints, "YFSVL.GetEndpoints") \
EM(afs_YFSVL_GetCellName, "YFSVL.GetCellName") \
E_(afs_VL_GetCapabilities, "VL.GetCapabilities")
#define afs_edit_dir_ops \
......@@ -345,6 +348,7 @@ enum afs_cb_break_reason {
EM(afs_eproto_bad_status, "BadStatus") \
EM(afs_eproto_cb_count, "CbCount") \
EM(afs_eproto_cb_fid_count, "CbFidCount") \
EM(afs_eproto_cellname_len, "CellNameLen") \
EM(afs_eproto_file_type, "FileTYpe") \
EM(afs_eproto_ibulkst_cb_count, "IBS.CbCount") \
EM(afs_eproto_ibulkst_count, "IBS.FidCount") \
......
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