pnfsblock: call and parse getdevicelist

Call GETDEVICELIST during mount, then call and parse GETDEVICEINFO
for each device returned.

[pnfsblock: get rid of deprecated xdr macros]
Signed-off-by: Jim Rees <rees@umich.edu>
[pnfsblock: fix pnfs_deviceid references]
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
[pnfsblock: fix print format warnings for sector_t and size_t]
[pnfs-block: #include <linux/vmalloc.h>]
[pnfsblock: no PNFS_NFS_SERVER]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[pnfsblock: fix bug determining size of striped volume]
[pnfsblock: fix oops when using multiple devices]
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Benny Halevy <bhalevy@tonian.com>
[pnfsblock: get rid of vmap and deviceid->area structure]
Signed-off-by: Peng Tao <peng_tao@emc.com>
Signed-off-by: Jim Rees <rees@umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

4 files changed, 157 insertions, 8 deletions

diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index e7bc7a57b3bb..6cd7f4f3acdb 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -157,17 +157,153 @@ bl_cleanup_layoutcommit(struct nfs4_layoutcommit_data *lcdata)
 {
 }
 
+static void free_blk_mountid(struct block_mount_id *mid)
+{
+        if (mid) {
+                struct pnfs_block_dev *dev;
+                spin_lock(&mid->bm_lock);
+                while (!list_empty(&mid->bm_devlist)) {
+                        dev = list_first_entry(&mid->bm_devlist,
+                                               struct pnfs_block_dev,
+                                               bm_node);
+                        list_del(&dev->bm_node);
+                        bl_free_block_dev(dev);
+                }
+                spin_unlock(&mid->bm_lock);
+                kfree(mid);
+        }
+}
+
+/* This is mostly copied from the filelayout's get_device_info function.
+ * It seems much of this should be at the generic pnfs level.
+ */
+static struct pnfs_block_dev *
+nfs4_blk_get_deviceinfo(struct nfs_server *server, const struct nfs_fh *fh,
+                        struct nfs4_deviceid *d_id)
+{
+        struct pnfs_device *dev;
+        struct pnfs_block_dev *rv = NULL;
+        u32 max_resp_sz;
+        int max_pages;
+        struct page **pages = NULL;
+        int i, rc;
+
+        /*
+         * Use the session max response size as the basis for setting
+         * GETDEVICEINFO's maxcount
+         */
+        max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
+        max_pages = max_resp_sz >> PAGE_SHIFT;
+        dprintk("%s max_resp_sz %u max_pages %d\n",
+                __func__, max_resp_sz, max_pages);
+
+        dev = kmalloc(sizeof(*dev), GFP_NOFS);
+        if (!dev) {
+                dprintk("%s kmalloc failed\n", __func__);
+                return NULL;
+        }
+
+        pages = kzalloc(max_pages * sizeof(struct page *), GFP_NOFS);
+        if (pages == NULL) {
+                kfree(dev);
+                return NULL;
+        }
+        for (i = 0; i < max_pages; i++) {
+                pages[i] = alloc_page(GFP_NOFS);
+                if (!pages[i])
+                        goto out_free;
+        }
+
+        memcpy(&dev->dev_id, d_id, sizeof(*d_id));
+        dev->layout_type = LAYOUT_BLOCK_VOLUME;
+        dev->pages = pages;
+        dev->pgbase = 0;
+        dev->pglen = PAGE_SIZE * max_pages;
+        dev->mincount = 0;
+
+        dprintk("%s: dev_id: %s\n", __func__, dev->dev_id.data);
+        rc = nfs4_proc_getdeviceinfo(server, dev);
+        dprintk("%s getdevice info returns %d\n", __func__, rc);
+        if (rc)
+                goto out_free;
+
+        rv = nfs4_blk_decode_device(server, dev);
+ out_free:
+        for (i = 0; i < max_pages; i++)
+                __free_page(pages[i]);
+        kfree(pages);
+        kfree(dev);
+        return rv;
+}
+
 static int
 bl_set_layoutdriver(struct nfs_server *server, const struct nfs_fh *fh)
 {
+        struct block_mount_id *b_mt_id = NULL;
+        struct pnfs_devicelist *dlist = NULL;
+        struct pnfs_block_dev *bdev;
+        LIST_HEAD(block_disklist);
+        int status = 0, i;
+
         dprintk("%s enter\n", __func__);
-        return 0;
+
+        if (server->pnfs_blksize == 0) {
+                dprintk("%s Server did not return blksize\n", __func__);
+                return -EINVAL;
+        }
+        b_mt_id = kzalloc(sizeof(struct block_mount_id), GFP_NOFS);
+        if (!b_mt_id) {
+                status = -ENOMEM;
+                goto out_error;
+        }
+        /* Initialize nfs4 block layout mount id */
+        spin_lock_init(&b_mt_id->bm_lock);
+        INIT_LIST_HEAD(&b_mt_id->bm_devlist);
+
+        dlist = kmalloc(sizeof(struct pnfs_devicelist), GFP_NOFS);
+        if (!dlist) {
+                status = -ENOMEM;
+                goto out_error;
+        }
+        dlist->eof = 0;
+        while (!dlist->eof) {
+                status = nfs4_proc_getdevicelist(server, fh, dlist);
+                if (status)
+                        goto out_error;
+                dprintk("%s GETDEVICELIST numdevs=%i, eof=%i\n",
+                        __func__, dlist->num_devs, dlist->eof);
+                for (i = 0; i < dlist->num_devs; i++) {
+                        bdev = nfs4_blk_get_deviceinfo(server, fh,
+                                                       &dlist->dev_id[i]);
+                        if (!bdev) {
+                                status = -ENODEV;
+                                goto out_error;
+                        }
+                        spin_lock(&b_mt_id->bm_lock);
+                        list_add(&bdev->bm_node, &b_mt_id->bm_devlist);
+                        spin_unlock(&b_mt_id->bm_lock);
+                }
+        }
+        dprintk("%s SUCCESS\n", __func__);
+        server->pnfs_ld_data = b_mt_id;
+
+ out_return:
+        kfree(dlist);
+        return status;
+
+ out_error:
+        free_blk_mountid(b_mt_id);
+        goto out_return;
 }
 
 static int
 bl_clear_layoutdriver(struct nfs_server *server)
 {
+        struct block_mount_id *b_mt_id = server->pnfs_ld_data;
+
         dprintk("%s enter\n", __func__);
+        free_blk_mountid(b_mt_id);
+        dprintk("%s RETURNS\n", __func__);
         return 0;
 }
 
diff --git a/fs/nfs/blocklayout/blocklayout.h b/fs/nfs/blocklayout/blocklayout.h
index 581d8f47a723..d645880f61a0 100644
--- a/fs/nfs/blocklayout/blocklayout.h
+++ b/fs/nfs/blocklayout/blocklayout.h
@@ -38,6 +38,11 @@
 
 #include "../pnfs.h"
 
+struct block_mount_id {
+        spinlock_t                      bm_lock;    /* protects list */
+        struct list_head                bm_devlist; /* holds pnfs_block_dev */
+};
+
 struct pnfs_block_dev {
         struct list_head                bm_node;
         struct nfs4_deviceid            bm_mdevid;    /* associated devid */
@@ -99,7 +104,10 @@ struct pnfs_block_layout {
         sector_t                bl_blocksize;  /* Server blocksize in sectors */
 };
 
-static inline struct pnfs_block_layout *BLK_LO2EXT(struct pnfs_layout_hdr *lo)
+#define BLK_ID(lo) ((struct block_mount_id *)(NFS_SERVER(lo->plh_inode)->pnfs_ld_data))
+
+static inline struct pnfs_block_layout *
+BLK_LO2EXT(struct pnfs_layout_hdr *lo)
 {
         return container_of(lo, struct pnfs_block_layout, bl_layout);
 }
@@ -137,8 +145,7 @@ void bl_pipe_destroy_msg(struct rpc_pipe_msg *);
 struct block_device *nfs4_blkdev_get(dev_t dev);
 int nfs4_blkdev_put(struct block_device *bdev);
 struct pnfs_block_dev *nfs4_blk_decode_device(struct nfs_server *server,
-                                                struct pnfs_device *dev,
-                                                struct list_head *sdlist);
+                                                struct pnfs_device *dev);
 int nfs4_blk_process_layoutget(struct pnfs_layout_hdr *lo,
                                 struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
 
diff --git a/fs/nfs/blocklayout/blocklayoutdev.c b/fs/nfs/blocklayout/blocklayoutdev.c
index 64da33a40eaf..b23fe601d1c9 100644
--- a/fs/nfs/blocklayout/blocklayoutdev.c
+++ b/fs/nfs/blocklayout/blocklayoutdev.c
@@ -116,8 +116,7 @@ void bl_pipe_destroy_msg(struct rpc_pipe_msg *msg)
  */
 struct pnfs_block_dev *
 nfs4_blk_decode_device(struct nfs_server *server,
-                       struct pnfs_device *dev,
-                       struct list_head *sdlist)
+                       struct pnfs_device *dev)
 {
         struct pnfs_block_dev *rv = NULL;
         struct block_device *bd = NULL;
@@ -129,6 +128,7 @@ nfs4_blk_decode_device(struct nfs_server *server,
         uint8_t *dataptr;
         DECLARE_WAITQUEUE(wq, current);
         struct bl_dev_msg *reply = &bl_mount_reply;
+        int offset, len, i;
 
         dprintk("%s CREATING PIPEFS MESSAGE\n", __func__);
         dprintk("%s: deviceid: %s, mincount: %d\n", __func__, dev->dev_id.data,
@@ -143,7 +143,14 @@ nfs4_blk_decode_device(struct nfs_server *server,
 
         memcpy(msg.data, &bl_msg, sizeof(bl_msg));
         dataptr = (uint8_t *) msg.data;
-        memcpy(&dataptr[sizeof(bl_msg)], dev->area, dev->mincount);
+        len = dev->mincount;
+        offset = sizeof(bl_msg);
+        for (i = 0; len > 0; i++) {
+                memcpy(&dataptr[offset], page_address(dev->pages[i]),
+                                len < PAGE_CACHE_SIZE ? len : PAGE_CACHE_SIZE);
+                len -= PAGE_CACHE_SIZE;
+                offset += PAGE_CACHE_SIZE;
+        }
         msg.len = sizeof(bl_msg) + dev->mincount;
 
         dprintk("%s CALLING USERSPACE DAEMON\n", __func__);
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 606fbde2e757..e0b5d80a43f6 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -140,7 +140,6 @@ struct pnfs_device {
         unsigned int  layout_type;
         unsigned int  mincount;
         struct page **pages;
-        void          *area;
         unsigned int  pgbase;
         unsigned int  pglen;
 };