zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/fs/nfs/blocklayout/blocklayoutdev.c b/ap/os/linux/linux-3.4.x/fs/nfs/blocklayout/blocklayoutdev.c
new file mode 100644
index 0000000..a5c88a5
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/nfs/blocklayout/blocklayoutdev.c
@@ -0,0 +1,399 @@
+/*
+ * 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;
+}
+
+/* Open a block_device by device number. */
+struct block_device *nfs4_blkdev_get(dev_t dev)
+{
+ struct block_device *bd;
+
+ dprintk("%s enter\n", __func__);
+ bd = blkdev_get_by_dev(dev, FMODE_READ, NULL);
+ if (IS_ERR(bd))
+ goto fail;
+ return bd;
+fail:
+ dprintk("%s failed to open device : %ld\n",
+ __func__, PTR_ERR(bd));
+ return NULL;
+}
+
+/*
+ * Release the block device
+ */
+int nfs4_blkdev_put(struct block_device *bdev)
+{
+ dprintk("%s for device %d:%d\n", __func__, MAJOR(bdev->bd_dev),
+ MINOR(bdev->bd_dev));
+ return 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->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 = nfs4_blkdev_get(MKDEV(reply->major, reply->minor));
+ if (IS_ERR(bd)) {
+ rc = PTR_ERR(bd);
+ dprintk("%s failed to open device : %d\n", __func__, rc);
+ rv = ERR_PTR(rc);
+ 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;
+}