392 строки
10 KiB
C
392 строки
10 KiB
C
/*
|
|
* 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 "%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);
|
|
}
|
|
|
|
static struct bl_dev_msg bl_mount_reply;
|
|
|
|
ssize_t bl_pipe_downcall(struct file *filp, const char __user *src,
|
|
size_t mlen)
|
|
{
|
|
if (mlen != sizeof (struct bl_dev_msg))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(&bl_mount_reply, src, mlen) != 0)
|
|
return -EFAULT;
|
|
|
|
wake_up(&bl_wq);
|
|
|
|
return mlen;
|
|
}
|
|
|
|
void bl_pipe_destroy_msg(struct rpc_pipe_msg *msg)
|
|
{
|
|
if (msg->errno >= 0)
|
|
return;
|
|
wake_up(&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 rpc_pipe_msg msg;
|
|
struct bl_msg_hdr bl_msg = {
|
|
.type = BL_DEVICE_MOUNT,
|
|
.totallen = dev->mincount,
|
|
};
|
|
uint8_t *dataptr;
|
|
DECLARE_WAITQUEUE(wq, current);
|
|
struct bl_dev_msg *reply = &bl_mount_reply;
|
|
int offset, len, i, rc;
|
|
|
|
dprintk("%s CREATING PIPEFS MESSAGE\n", __func__);
|
|
dprintk("%s: deviceid: %s, mincount: %d\n", __func__, dev->dev_id.data,
|
|
dev->mincount);
|
|
|
|
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(&bl_wq, &wq);
|
|
rc = rpc_queue_upcall(bl_device_pipe->d_inode, &msg);
|
|
if (rc < 0) {
|
|
remove_wait_queue(&bl_wq, &wq);
|
|
rv = ERR_PTR(rc);
|
|
goto out;
|
|
}
|
|
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
schedule();
|
|
__set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&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));
|
|
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;
|
|
}
|