Implement a .get_device_info operation from the
pnfs_export_operations.
Retrieve to system_id and osdname for the requested
devices.
TODO: Return also UNC hints for the device login
information.
Signed-off-by: Boaz Harrosh <bharrosh@xxxxxxxxxxx>
---
fs/exofs/export.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 54 insertions(+), 0 deletions(-)
diff --git a/fs/exofs/export.c b/fs/exofs/export.c
index 0a068b7..23c1666 100644
--- a/fs/exofs/export.c
+++ b/fs/exofs/export.c
@@ -185,11 +185,65 @@ static int exofs_layout_return(
return 0;
}
+int exofs_get_device_info(struct super_block *sb, struct exp_xdr_stream *xdr,
+ u32 layout_type,
+ const struct nfsd4_pnfs_deviceid *devid)
+{
+ struct exofs_sb_info *sbi = sb->s_fs_info;
+ struct pnfs_osd_deviceaddr devaddr;
+ const struct osd_dev_info *odi;
+ u64 devno = devid->devid;
+ __be32 *start;
+ int err;
+
+ memset(&devaddr, 0, sizeof(devaddr));
+
+ if (unlikely(devno >= sbi->layout.s_numdevs)) {
+ EXOFS_DBGMSG("Error: Device((%llx,%llx) does not exist\n",
+ devid->sbid, devno);
+ return -ENODEV;
+ }
+
+ odi = osduld_device_info(sbi->layout.s_ods[devno]);
+
+ devaddr.oda_systemid.len = odi->systemid_len;
+ devaddr.oda_systemid.data = (void *)odi->systemid; /* !const cast */
+
+ devaddr.oda_osdname.len = odi->osdname_len ;
+ devaddr.oda_osdname.data = (void *)odi->osdname;/* !const cast */
+
+ /* skip opaque size, will be filled-in later */
+ start = exp_xdr_reserve_qwords(xdr, 1);
+ if (!start) {
+ err = -ETOOSMALL;
+ goto err;
+ }
+
+ err = pnfs_osd_xdr_encode_deviceaddr(xdr, &devaddr);
+ if (err) {
+ err = -ETOOSMALL;
+ goto err;
+ }
+
+ exp_xdr_encode_opaque_len(start, xdr->p);
+
+ EXOFS_DBGMSG("xdr_bytes=%Zu devid=(%llx,%llx) osdname-%s\n",
+ exp_xdr_qbytes(xdr->p - start), devid->sbid, devno,
+ odi->osdname);
+ return 0;
+
+err:
+ EXOFS_DBGMSG("Error: err=%d at_byte=%zu\n",
+ err, exp_xdr_qbytes(xdr->p - start));
+ return err;
+}
+
struct pnfs_export_operations exofs_pnfs_ops = {
.layout_type = exofs_layout_type,
.layout_get = exofs_layout_get,
.layout_commit = exofs_layout_commit,
.layout_return = exofs_layout_return,
+ .get_device_info = exofs_get_device_info,
};
void exofs_init_export(struct super_block *sb)
--
1.7.3.4
--
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