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Diffstat (limited to 'fs/nfs/blocklayout/blocklayoutdev.c')
-rw-r--r--fs/nfs/blocklayout/blocklayoutdev.c384
1 files changed, 0 insertions, 384 deletions
diff --git a/fs/nfs/blocklayout/blocklayoutdev.c b/fs/nfs/blocklayout/blocklayoutdev.c
deleted file mode 100644
index 04303b5c9361..000000000000
--- a/fs/nfs/blocklayout/blocklayoutdev.c
+++ /dev/null
@@ -1,384 +0,0 @@
-/*
- * linux/fs/nfs/blocklayout/blocklayoutdev.c
- *
- * Device operations for the pnfs nfs4 file layout driver.
- *
- * Copyright (c) 2006 The Regents of the University of Michigan.
- * All rights reserved.
- *
- * Andy Adamson <andros@citi.umich.edu>
- * Fred Isaman <iisaman@umich.edu>
- *
- * permission is granted to use, copy, create derivative works and
- * redistribute this software and such derivative works for any purpose,
- * so long as the name of the university of michigan is not used in
- * any advertising or publicity pertaining to the use or distribution
- * of this software without specific, written prior authorization. if
- * the above copyright notice or any other identification of the
- * university of michigan is included in any copy of any portion of
- * this software, then the disclaimer below must also be included.
- *
- * this software is provided as is, without representation from the
- * university of michigan as to its fitness for any purpose, and without
- * warranty by the university of michigan of any kind, either express
- * or implied, including without limitation the implied warranties of
- * merchantability and fitness for a particular purpose. the regents
- * of the university of michigan shall not be liable for any damages,
- * including special, indirect, incidental, or consequential damages,
- * with respect to any claim arising out or in connection with the use
- * of the software, even if it has been or is hereafter advised of the
- * possibility of such damages.
- */
-#include <linux/module.h>
-#include <linux/buffer_head.h> /* __bread */
-
-#include <linux/genhd.h>
-#include <linux/blkdev.h>
-#include <linux/hash.h>
-
-#include "blocklayout.h"
-
-#define NFSDBG_FACILITY NFSDBG_PNFS_LD
-
-static int decode_sector_number(__be32 **rp, sector_t *sp)
-{
- uint64_t s;
-
- *rp = xdr_decode_hyper(*rp, &s);
- if (s & 0x1ff) {
- printk(KERN_WARNING "NFS: %s: sector not aligned\n", __func__);
- return -1;
- }
- *sp = s >> SECTOR_SHIFT;
- return 0;
-}
-
-/*
- * Release the block device
- */
-void nfs4_blkdev_put(struct block_device *bdev)
-{
- dprintk("%s for device %d:%d\n", __func__, MAJOR(bdev->bd_dev),
- MINOR(bdev->bd_dev));
- blkdev_put(bdev, FMODE_READ);
-}
-
-ssize_t bl_pipe_downcall(struct file *filp, const char __user *src,
- size_t mlen)
-{
- struct nfs_net *nn = net_generic(filp->f_dentry->d_sb->s_fs_info,
- nfs_net_id);
-
- if (mlen != sizeof (struct bl_dev_msg))
- return -EINVAL;
-
- if (copy_from_user(&nn->bl_mount_reply, src, mlen) != 0)
- return -EFAULT;
-
- wake_up(&nn->bl_wq);
-
- return mlen;
-}
-
-void bl_pipe_destroy_msg(struct rpc_pipe_msg *msg)
-{
- struct bl_pipe_msg *bl_pipe_msg = container_of(msg, struct bl_pipe_msg, msg);
-
- if (msg->errno >= 0)
- return;
- wake_up(bl_pipe_msg->bl_wq);
-}
-
-/*
- * Decodes pnfs_block_deviceaddr4 which is XDR encoded in dev->dev_addr_buf.
- */
-struct pnfs_block_dev *
-nfs4_blk_decode_device(struct nfs_server *server,
- struct pnfs_device *dev)
-{
- struct pnfs_block_dev *rv;
- struct block_device *bd = NULL;
- struct bl_pipe_msg bl_pipe_msg;
- struct rpc_pipe_msg *msg = &bl_pipe_msg.msg;
- struct bl_msg_hdr bl_msg = {
- .type = BL_DEVICE_MOUNT,
- .totallen = dev->mincount,
- };
- uint8_t *dataptr;
- DECLARE_WAITQUEUE(wq, current);
- int offset, len, i, rc;
- struct net *net = server->nfs_client->cl_net;
- struct nfs_net *nn = net_generic(net, nfs_net_id);
- struct bl_dev_msg *reply = &nn->bl_mount_reply;
-
- dprintk("%s CREATING PIPEFS MESSAGE\n", __func__);
- dprintk("%s: deviceid: %s, mincount: %d\n", __func__, dev->dev_id.data,
- dev->mincount);
-
- bl_pipe_msg.bl_wq = &nn->bl_wq;
- memset(msg, 0, sizeof(*msg));
- msg->data = kzalloc(sizeof(bl_msg) + dev->mincount, GFP_NOFS);
- if (!msg->data) {
- rv = ERR_PTR(-ENOMEM);
- goto out;
- }
-
- memcpy(msg->data, &bl_msg, sizeof(bl_msg));
- dataptr = (uint8_t *) msg->data;
- 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__);
- add_wait_queue(&nn->bl_wq, &wq);
- rc = rpc_queue_upcall(nn->bl_device_pipe, msg);
- if (rc < 0) {
- remove_wait_queue(&nn->bl_wq, &wq);
- rv = ERR_PTR(rc);
- goto out;
- }
-
- set_current_state(TASK_UNINTERRUPTIBLE);
- schedule();
- __set_current_state(TASK_RUNNING);
- remove_wait_queue(&nn->bl_wq, &wq);
-
- if (reply->status != BL_DEVICE_REQUEST_PROC) {
- dprintk("%s failed to open device: %d\n",
- __func__, reply->status);
- rv = ERR_PTR(-EINVAL);
- goto out;
- }
-
- bd = blkdev_get_by_dev(MKDEV(reply->major, reply->minor),
- FMODE_READ, NULL);
- if (IS_ERR(bd)) {
- dprintk("%s failed to open device : %ld\n", __func__,
- PTR_ERR(bd));
- rv = ERR_CAST(bd);
- goto out;
- }
-
- rv = kzalloc(sizeof(*rv), GFP_NOFS);
- if (!rv) {
- rv = ERR_PTR(-ENOMEM);
- goto out;
- }
-
- rv->bm_mdev = bd;
- memcpy(&rv->bm_mdevid, &dev->dev_id, sizeof(struct nfs4_deviceid));
- rv->net = net;
- dprintk("%s Created device %s with bd_block_size %u\n",
- __func__,
- bd->bd_disk->disk_name,
- bd->bd_block_size);
-
-out:
- kfree(msg->data);
- return rv;
-}
-
-/* Map deviceid returned by the server to constructed block_device */
-static struct block_device *translate_devid(struct pnfs_layout_hdr *lo,
- struct nfs4_deviceid *id)
-{
- struct block_device *rv = NULL;
- struct block_mount_id *mid;
- struct pnfs_block_dev *dev;
-
- dprintk("%s enter, lo=%p, id=%p\n", __func__, lo, id);
- mid = BLK_ID(lo);
- spin_lock(&mid->bm_lock);
- list_for_each_entry(dev, &mid->bm_devlist, bm_node) {
- if (memcmp(id->data, dev->bm_mdevid.data,
- NFS4_DEVICEID4_SIZE) == 0) {
- rv = dev->bm_mdev;
- goto out;
- }
- }
- out:
- spin_unlock(&mid->bm_lock);
- dprintk("%s returning %p\n", __func__, rv);
- return rv;
-}
-
-/* Tracks info needed to ensure extents in layout obey constraints of spec */
-struct layout_verification {
- u32 mode; /* R or RW */
- u64 start; /* Expected start of next non-COW extent */
- u64 inval; /* Start of INVAL coverage */
- u64 cowread; /* End of COW read coverage */
-};
-
-/* Verify the extent meets the layout requirements of the pnfs-block draft,
- * section 2.3.1.
- */
-static int verify_extent(struct pnfs_block_extent *be,
- struct layout_verification *lv)
-{
- if (lv->mode == IOMODE_READ) {
- if (be->be_state == PNFS_BLOCK_READWRITE_DATA ||
- be->be_state == PNFS_BLOCK_INVALID_DATA)
- return -EIO;
- if (be->be_f_offset != lv->start)
- return -EIO;
- lv->start += be->be_length;
- return 0;
- }
- /* lv->mode == IOMODE_RW */
- if (be->be_state == PNFS_BLOCK_READWRITE_DATA) {
- if (be->be_f_offset != lv->start)
- return -EIO;
- if (lv->cowread > lv->start)
- return -EIO;
- lv->start += be->be_length;
- lv->inval = lv->start;
- return 0;
- } else if (be->be_state == PNFS_BLOCK_INVALID_DATA) {
- if (be->be_f_offset != lv->start)
- return -EIO;
- lv->start += be->be_length;
- return 0;
- } else if (be->be_state == PNFS_BLOCK_READ_DATA) {
- if (be->be_f_offset > lv->start)
- return -EIO;
- if (be->be_f_offset < lv->inval)
- return -EIO;
- if (be->be_f_offset < lv->cowread)
- return -EIO;
- /* It looks like you might want to min this with lv->start,
- * but you really don't.
- */
- lv->inval = lv->inval + be->be_length;
- lv->cowread = be->be_f_offset + be->be_length;
- return 0;
- } else
- return -EIO;
-}
-
-/* XDR decode pnfs_block_layout4 structure */
-int
-nfs4_blk_process_layoutget(struct pnfs_layout_hdr *lo,
- struct nfs4_layoutget_res *lgr, gfp_t gfp_flags)
-{
- struct pnfs_block_layout *bl = BLK_LO2EXT(lo);
- int i, status = -EIO;
- uint32_t count;
- struct pnfs_block_extent *be = NULL, *save;
- struct xdr_stream stream;
- struct xdr_buf buf;
- struct page *scratch;
- __be32 *p;
- struct layout_verification lv = {
- .mode = lgr->range.iomode,
- .start = lgr->range.offset >> SECTOR_SHIFT,
- .inval = lgr->range.offset >> SECTOR_SHIFT,
- .cowread = lgr->range.offset >> SECTOR_SHIFT,
- };
- LIST_HEAD(extents);
-
- dprintk("---> %s\n", __func__);
-
- scratch = alloc_page(gfp_flags);
- if (!scratch)
- return -ENOMEM;
-
- xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len);
- xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
-
- p = xdr_inline_decode(&stream, 4);
- if (unlikely(!p))
- goto out_err;
-
- count = be32_to_cpup(p++);
-
- dprintk("%s enter, number of extents %i\n", __func__, count);
- p = xdr_inline_decode(&stream, (28 + NFS4_DEVICEID4_SIZE) * count);
- if (unlikely(!p))
- goto out_err;
-
- /* Decode individual extents, putting them in temporary
- * staging area until whole layout is decoded to make error
- * recovery easier.
- */
- for (i = 0; i < count; i++) {
- be = bl_alloc_extent();
- if (!be) {
- status = -ENOMEM;
- goto out_err;
- }
- memcpy(&be->be_devid, p, NFS4_DEVICEID4_SIZE);
- p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
- be->be_mdev = translate_devid(lo, &be->be_devid);
- if (!be->be_mdev)
- goto out_err;
-
- /* The next three values are read in as bytes,
- * but stored as 512-byte sector lengths
- */
- if (decode_sector_number(&p, &be->be_f_offset) < 0)
- goto out_err;
- if (decode_sector_number(&p, &be->be_length) < 0)
- goto out_err;
- if (decode_sector_number(&p, &be->be_v_offset) < 0)
- goto out_err;
- be->be_state = be32_to_cpup(p++);
- if (be->be_state == PNFS_BLOCK_INVALID_DATA)
- be->be_inval = &bl->bl_inval;
- if (verify_extent(be, &lv)) {
- dprintk("%s verify failed\n", __func__);
- goto out_err;
- }
- list_add_tail(&be->be_node, &extents);
- }
- if (lgr->range.offset + lgr->range.length !=
- lv.start << SECTOR_SHIFT) {
- dprintk("%s Final length mismatch\n", __func__);
- be = NULL;
- goto out_err;
- }
- if (lv.start < lv.cowread) {
- dprintk("%s Final uncovered COW extent\n", __func__);
- be = NULL;
- goto out_err;
- }
- /* Extents decoded properly, now try to merge them in to
- * existing layout extents.
- */
- spin_lock(&bl->bl_ext_lock);
- list_for_each_entry_safe(be, save, &extents, be_node) {
- list_del(&be->be_node);
- status = bl_add_merge_extent(bl, be);
- if (status) {
- spin_unlock(&bl->bl_ext_lock);
- /* This is a fairly catastrophic error, as the
- * entire layout extent lists are now corrupted.
- * We should have some way to distinguish this.
- */
- be = NULL;
- goto out_err;
- }
- }
- spin_unlock(&bl->bl_ext_lock);
- status = 0;
- out:
- __free_page(scratch);
- dprintk("%s returns %i\n", __func__, status);
- return status;
-
- out_err:
- bl_put_extent(be);
- while (!list_empty(&extents)) {
- be = list_first_entry(&extents, struct pnfs_block_extent,
- be_node);
- list_del(&be->be_node);
- bl_put_extent(be);
- }
- goto out;
-}
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