/*
|
* linux/fs/nfs/blocklayout/blocklayout.c
|
*
|
* Module for the NFSv4.1 pNFS block 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/init.h>
|
#include <linux/mount.h>
|
#include <linux/namei.h>
|
#include <linux/bio.h> /* struct bio */
|
#include <linux/prefetch.h>
|
#include <linux/pagevec.h>
|
|
#include "../pnfs.h"
|
#include "../nfs4session.h"
|
#include "../internal.h"
|
#include "blocklayout.h"
|
|
#define NFSDBG_FACILITY NFSDBG_PNFS_LD
|
|
MODULE_LICENSE("GPL");
|
MODULE_AUTHOR("Andy Adamson <andros@citi.umich.edu>");
|
MODULE_DESCRIPTION("The NFSv4.1 pNFS Block layout driver");
|
|
static bool is_hole(struct pnfs_block_extent *be)
|
{
|
switch (be->be_state) {
|
case PNFS_BLOCK_NONE_DATA:
|
return true;
|
case PNFS_BLOCK_INVALID_DATA:
|
return be->be_tag ? false : true;
|
default:
|
return false;
|
}
|
}
|
|
/* The data we are handed might be spread across several bios. We need
|
* to track when the last one is finished.
|
*/
|
struct parallel_io {
|
struct kref refcnt;
|
void (*pnfs_callback) (void *data);
|
void *data;
|
};
|
|
static inline struct parallel_io *alloc_parallel(void *data)
|
{
|
struct parallel_io *rv;
|
|
rv = kmalloc(sizeof(*rv), GFP_NOFS);
|
if (rv) {
|
rv->data = data;
|
kref_init(&rv->refcnt);
|
}
|
return rv;
|
}
|
|
static inline void get_parallel(struct parallel_io *p)
|
{
|
kref_get(&p->refcnt);
|
}
|
|
static void destroy_parallel(struct kref *kref)
|
{
|
struct parallel_io *p = container_of(kref, struct parallel_io, refcnt);
|
|
dprintk("%s enter\n", __func__);
|
p->pnfs_callback(p->data);
|
kfree(p);
|
}
|
|
static inline void put_parallel(struct parallel_io *p)
|
{
|
kref_put(&p->refcnt, destroy_parallel);
|
}
|
|
static struct bio *
|
bl_submit_bio(struct bio *bio)
|
{
|
if (bio) {
|
get_parallel(bio->bi_private);
|
dprintk("%s submitting %s bio %u@%llu\n", __func__,
|
bio_op(bio) == READ ? "read" : "write",
|
bio->bi_iter.bi_size,
|
(unsigned long long)bio->bi_iter.bi_sector);
|
submit_bio(bio);
|
}
|
return NULL;
|
}
|
|
static struct bio *
|
bl_alloc_init_bio(int npg, struct block_device *bdev, sector_t disk_sector,
|
bio_end_io_t end_io, struct parallel_io *par)
|
{
|
struct bio *bio;
|
|
npg = min(npg, BIO_MAX_PAGES);
|
bio = bio_alloc(GFP_NOIO, npg);
|
if (!bio && (current->flags & PF_MEMALLOC)) {
|
while (!bio && (npg /= 2))
|
bio = bio_alloc(GFP_NOIO, npg);
|
}
|
|
if (bio) {
|
bio->bi_iter.bi_sector = disk_sector;
|
bio_set_dev(bio, bdev);
|
bio->bi_end_io = end_io;
|
bio->bi_private = par;
|
}
|
return bio;
|
}
|
|
static bool offset_in_map(u64 offset, struct pnfs_block_dev_map *map)
|
{
|
return offset >= map->start && offset < map->start + map->len;
|
}
|
|
static struct bio *
|
do_add_page_to_bio(struct bio *bio, int npg, int rw, sector_t isect,
|
struct page *page, struct pnfs_block_dev_map *map,
|
struct pnfs_block_extent *be, bio_end_io_t end_io,
|
struct parallel_io *par, unsigned int offset, int *len)
|
{
|
struct pnfs_block_dev *dev =
|
container_of(be->be_device, struct pnfs_block_dev, node);
|
u64 disk_addr, end;
|
|
dprintk("%s: npg %d rw %d isect %llu offset %u len %d\n", __func__,
|
npg, rw, (unsigned long long)isect, offset, *len);
|
|
/* translate to device offset */
|
isect += be->be_v_offset;
|
isect -= be->be_f_offset;
|
|
/* translate to physical disk offset */
|
disk_addr = (u64)isect << SECTOR_SHIFT;
|
if (!offset_in_map(disk_addr, map)) {
|
if (!dev->map(dev, disk_addr, map) || !offset_in_map(disk_addr, map))
|
return ERR_PTR(-EIO);
|
bio = bl_submit_bio(bio);
|
}
|
disk_addr += map->disk_offset;
|
disk_addr -= map->start;
|
|
/* limit length to what the device mapping allows */
|
end = disk_addr + *len;
|
if (end >= map->start + map->len)
|
*len = map->start + map->len - disk_addr;
|
|
retry:
|
if (!bio) {
|
bio = bl_alloc_init_bio(npg, map->bdev,
|
disk_addr >> SECTOR_SHIFT, end_io, par);
|
if (!bio)
|
return ERR_PTR(-ENOMEM);
|
bio_set_op_attrs(bio, rw, 0);
|
}
|
if (bio_add_page(bio, page, *len, offset) < *len) {
|
bio = bl_submit_bio(bio);
|
goto retry;
|
}
|
return bio;
|
}
|
|
static void bl_mark_devices_unavailable(struct nfs_pgio_header *header, bool rw)
|
{
|
struct pnfs_block_layout *bl = BLK_LSEG2EXT(header->lseg);
|
size_t bytes_left = header->args.count;
|
sector_t isect, extent_length = 0;
|
struct pnfs_block_extent be;
|
|
isect = header->args.offset >> SECTOR_SHIFT;
|
bytes_left += header->args.offset - (isect << SECTOR_SHIFT);
|
|
while (bytes_left > 0) {
|
if (!ext_tree_lookup(bl, isect, &be, rw))
|
return;
|
extent_length = be.be_length - (isect - be.be_f_offset);
|
nfs4_mark_deviceid_unavailable(be.be_device);
|
isect += extent_length;
|
if (bytes_left > extent_length << SECTOR_SHIFT)
|
bytes_left -= extent_length << SECTOR_SHIFT;
|
else
|
bytes_left = 0;
|
}
|
}
|
|
static void bl_end_io_read(struct bio *bio)
|
{
|
struct parallel_io *par = bio->bi_private;
|
|
if (bio->bi_status) {
|
struct nfs_pgio_header *header = par->data;
|
|
if (!header->pnfs_error)
|
header->pnfs_error = -EIO;
|
pnfs_set_lo_fail(header->lseg);
|
bl_mark_devices_unavailable(header, false);
|
}
|
|
bio_put(bio);
|
put_parallel(par);
|
}
|
|
static void bl_read_cleanup(struct work_struct *work)
|
{
|
struct rpc_task *task;
|
struct nfs_pgio_header *hdr;
|
dprintk("%s enter\n", __func__);
|
task = container_of(work, struct rpc_task, u.tk_work);
|
hdr = container_of(task, struct nfs_pgio_header, task);
|
pnfs_ld_read_done(hdr);
|
}
|
|
static void
|
bl_end_par_io_read(void *data)
|
{
|
struct nfs_pgio_header *hdr = data;
|
|
hdr->task.tk_status = hdr->pnfs_error;
|
INIT_WORK(&hdr->task.u.tk_work, bl_read_cleanup);
|
schedule_work(&hdr->task.u.tk_work);
|
}
|
|
static enum pnfs_try_status
|
bl_read_pagelist(struct nfs_pgio_header *header)
|
{
|
struct pnfs_block_layout *bl = BLK_LSEG2EXT(header->lseg);
|
struct pnfs_block_dev_map map = { .start = NFS4_MAX_UINT64 };
|
struct bio *bio = NULL;
|
struct pnfs_block_extent be;
|
sector_t isect, extent_length = 0;
|
struct parallel_io *par;
|
loff_t f_offset = header->args.offset;
|
size_t bytes_left = header->args.count;
|
unsigned int pg_offset = header->args.pgbase, pg_len;
|
struct page **pages = header->args.pages;
|
int pg_index = header->args.pgbase >> PAGE_SHIFT;
|
const bool is_dio = (header->dreq != NULL);
|
struct blk_plug plug;
|
int i;
|
|
dprintk("%s enter nr_pages %u offset %lld count %u\n", __func__,
|
header->page_array.npages, f_offset,
|
(unsigned int)header->args.count);
|
|
par = alloc_parallel(header);
|
if (!par)
|
return PNFS_NOT_ATTEMPTED;
|
par->pnfs_callback = bl_end_par_io_read;
|
|
blk_start_plug(&plug);
|
|
isect = (sector_t) (f_offset >> SECTOR_SHIFT);
|
/* Code assumes extents are page-aligned */
|
for (i = pg_index; i < header->page_array.npages; i++) {
|
if (extent_length <= 0) {
|
/* We've used up the previous extent */
|
bio = bl_submit_bio(bio);
|
|
/* Get the next one */
|
if (!ext_tree_lookup(bl, isect, &be, false)) {
|
header->pnfs_error = -EIO;
|
goto out;
|
}
|
extent_length = be.be_length - (isect - be.be_f_offset);
|
}
|
|
if (is_dio) {
|
if (pg_offset + bytes_left > PAGE_SIZE)
|
pg_len = PAGE_SIZE - pg_offset;
|
else
|
pg_len = bytes_left;
|
} else {
|
BUG_ON(pg_offset != 0);
|
pg_len = PAGE_SIZE;
|
}
|
|
if (is_hole(&be)) {
|
bio = bl_submit_bio(bio);
|
/* Fill hole w/ zeroes w/o accessing device */
|
dprintk("%s Zeroing page for hole\n", __func__);
|
zero_user_segment(pages[i], pg_offset, pg_len);
|
|
/* invalidate map */
|
map.start = NFS4_MAX_UINT64;
|
} else {
|
bio = do_add_page_to_bio(bio,
|
header->page_array.npages - i,
|
READ,
|
isect, pages[i], &map, &be,
|
bl_end_io_read, par,
|
pg_offset, &pg_len);
|
if (IS_ERR(bio)) {
|
header->pnfs_error = PTR_ERR(bio);
|
bio = NULL;
|
goto out;
|
}
|
}
|
isect += (pg_len >> SECTOR_SHIFT);
|
extent_length -= (pg_len >> SECTOR_SHIFT);
|
f_offset += pg_len;
|
bytes_left -= pg_len;
|
pg_offset = 0;
|
}
|
if ((isect << SECTOR_SHIFT) >= header->inode->i_size) {
|
header->res.eof = 1;
|
header->res.count = header->inode->i_size - header->args.offset;
|
} else {
|
header->res.count = (isect << SECTOR_SHIFT) - header->args.offset;
|
}
|
out:
|
bl_submit_bio(bio);
|
blk_finish_plug(&plug);
|
put_parallel(par);
|
return PNFS_ATTEMPTED;
|
}
|
|
static void bl_end_io_write(struct bio *bio)
|
{
|
struct parallel_io *par = bio->bi_private;
|
struct nfs_pgio_header *header = par->data;
|
|
if (bio->bi_status) {
|
if (!header->pnfs_error)
|
header->pnfs_error = -EIO;
|
pnfs_set_lo_fail(header->lseg);
|
bl_mark_devices_unavailable(header, true);
|
}
|
bio_put(bio);
|
put_parallel(par);
|
}
|
|
/* Function scheduled for call during bl_end_par_io_write,
|
* it marks sectors as written and extends the commitlist.
|
*/
|
static void bl_write_cleanup(struct work_struct *work)
|
{
|
struct rpc_task *task = container_of(work, struct rpc_task, u.tk_work);
|
struct nfs_pgio_header *hdr =
|
container_of(task, struct nfs_pgio_header, task);
|
|
dprintk("%s enter\n", __func__);
|
|
if (likely(!hdr->pnfs_error)) {
|
struct pnfs_block_layout *bl = BLK_LSEG2EXT(hdr->lseg);
|
u64 start = hdr->args.offset & (loff_t)PAGE_MASK;
|
u64 end = (hdr->args.offset + hdr->args.count +
|
PAGE_SIZE - 1) & (loff_t)PAGE_MASK;
|
u64 lwb = hdr->args.offset + hdr->args.count;
|
|
ext_tree_mark_written(bl, start >> SECTOR_SHIFT,
|
(end - start) >> SECTOR_SHIFT, lwb);
|
}
|
|
pnfs_ld_write_done(hdr);
|
}
|
|
/* Called when last of bios associated with a bl_write_pagelist call finishes */
|
static void bl_end_par_io_write(void *data)
|
{
|
struct nfs_pgio_header *hdr = data;
|
|
hdr->task.tk_status = hdr->pnfs_error;
|
hdr->verf.committed = NFS_FILE_SYNC;
|
INIT_WORK(&hdr->task.u.tk_work, bl_write_cleanup);
|
schedule_work(&hdr->task.u.tk_work);
|
}
|
|
static enum pnfs_try_status
|
bl_write_pagelist(struct nfs_pgio_header *header, int sync)
|
{
|
struct pnfs_block_layout *bl = BLK_LSEG2EXT(header->lseg);
|
struct pnfs_block_dev_map map = { .start = NFS4_MAX_UINT64 };
|
struct bio *bio = NULL;
|
struct pnfs_block_extent be;
|
sector_t isect, extent_length = 0;
|
struct parallel_io *par = NULL;
|
loff_t offset = header->args.offset;
|
size_t count = header->args.count;
|
struct page **pages = header->args.pages;
|
int pg_index = header->args.pgbase >> PAGE_SHIFT;
|
unsigned int pg_len;
|
struct blk_plug plug;
|
int i;
|
|
dprintk("%s enter, %zu@%lld\n", __func__, count, offset);
|
|
/* At this point, header->page_aray is a (sequential) list of nfs_pages.
|
* We want to write each, and if there is an error set pnfs_error
|
* to have it redone using nfs.
|
*/
|
par = alloc_parallel(header);
|
if (!par)
|
return PNFS_NOT_ATTEMPTED;
|
par->pnfs_callback = bl_end_par_io_write;
|
|
blk_start_plug(&plug);
|
|
/* we always write out the whole page */
|
offset = offset & (loff_t)PAGE_MASK;
|
isect = offset >> SECTOR_SHIFT;
|
|
for (i = pg_index; i < header->page_array.npages; i++) {
|
if (extent_length <= 0) {
|
/* We've used up the previous extent */
|
bio = bl_submit_bio(bio);
|
/* Get the next one */
|
if (!ext_tree_lookup(bl, isect, &be, true)) {
|
header->pnfs_error = -EINVAL;
|
goto out;
|
}
|
|
extent_length = be.be_length - (isect - be.be_f_offset);
|
}
|
|
pg_len = PAGE_SIZE;
|
bio = do_add_page_to_bio(bio, header->page_array.npages - i,
|
WRITE, isect, pages[i], &map, &be,
|
bl_end_io_write, par,
|
0, &pg_len);
|
if (IS_ERR(bio)) {
|
header->pnfs_error = PTR_ERR(bio);
|
bio = NULL;
|
goto out;
|
}
|
|
offset += pg_len;
|
count -= pg_len;
|
isect += (pg_len >> SECTOR_SHIFT);
|
extent_length -= (pg_len >> SECTOR_SHIFT);
|
}
|
|
header->res.count = header->args.count;
|
out:
|
bl_submit_bio(bio);
|
blk_finish_plug(&plug);
|
put_parallel(par);
|
return PNFS_ATTEMPTED;
|
}
|
|
static void bl_free_layout_hdr(struct pnfs_layout_hdr *lo)
|
{
|
struct pnfs_block_layout *bl = BLK_LO2EXT(lo);
|
int err;
|
|
dprintk("%s enter\n", __func__);
|
|
err = ext_tree_remove(bl, true, 0, LLONG_MAX);
|
WARN_ON(err);
|
|
kfree_rcu(bl, bl_layout.plh_rcu);
|
}
|
|
static struct pnfs_layout_hdr *__bl_alloc_layout_hdr(struct inode *inode,
|
gfp_t gfp_flags, bool is_scsi_layout)
|
{
|
struct pnfs_block_layout *bl;
|
|
dprintk("%s enter\n", __func__);
|
bl = kzalloc(sizeof(*bl), gfp_flags);
|
if (!bl)
|
return NULL;
|
|
bl->bl_ext_rw = RB_ROOT;
|
bl->bl_ext_ro = RB_ROOT;
|
spin_lock_init(&bl->bl_ext_lock);
|
|
bl->bl_scsi_layout = is_scsi_layout;
|
return &bl->bl_layout;
|
}
|
|
static struct pnfs_layout_hdr *bl_alloc_layout_hdr(struct inode *inode,
|
gfp_t gfp_flags)
|
{
|
return __bl_alloc_layout_hdr(inode, gfp_flags, false);
|
}
|
|
static struct pnfs_layout_hdr *sl_alloc_layout_hdr(struct inode *inode,
|
gfp_t gfp_flags)
|
{
|
return __bl_alloc_layout_hdr(inode, gfp_flags, true);
|
}
|
|
static void bl_free_lseg(struct pnfs_layout_segment *lseg)
|
{
|
dprintk("%s enter\n", __func__);
|
kfree(lseg);
|
}
|
|
/* 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;
|
}
|
|
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;
|
}
|
|
static struct nfs4_deviceid_node *
|
bl_find_get_deviceid(struct nfs_server *server,
|
const struct nfs4_deviceid *id, const struct cred *cred,
|
gfp_t gfp_mask)
|
{
|
struct nfs4_deviceid_node *node;
|
unsigned long start, end;
|
|
retry:
|
node = nfs4_find_get_deviceid(server, id, cred, gfp_mask);
|
if (!node)
|
return ERR_PTR(-ENODEV);
|
|
if (test_bit(NFS_DEVICEID_UNAVAILABLE, &node->flags) == 0)
|
return node;
|
|
end = jiffies;
|
start = end - PNFS_DEVICE_RETRY_TIMEOUT;
|
if (!time_in_range(node->timestamp_unavailable, start, end)) {
|
nfs4_delete_deviceid(node->ld, node->nfs_client, id);
|
goto retry;
|
}
|
return ERR_PTR(-ENODEV);
|
}
|
|
static int
|
bl_alloc_extent(struct xdr_stream *xdr, struct pnfs_layout_hdr *lo,
|
struct layout_verification *lv, struct list_head *extents,
|
gfp_t gfp_mask)
|
{
|
struct pnfs_block_extent *be;
|
struct nfs4_deviceid id;
|
int error;
|
__be32 *p;
|
|
p = xdr_inline_decode(xdr, 28 + NFS4_DEVICEID4_SIZE);
|
if (!p)
|
return -EIO;
|
|
be = kzalloc(sizeof(*be), GFP_NOFS);
|
if (!be)
|
return -ENOMEM;
|
|
memcpy(&id, p, NFS4_DEVICEID4_SIZE);
|
p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
|
|
be->be_device = bl_find_get_deviceid(NFS_SERVER(lo->plh_inode), &id,
|
lo->plh_lc_cred, gfp_mask);
|
if (IS_ERR(be->be_device)) {
|
error = PTR_ERR(be->be_device);
|
goto out_free_be;
|
}
|
|
/*
|
* The next three values are read in as bytes, but stored in the
|
* extent structure in 512-byte granularity.
|
*/
|
error = -EIO;
|
if (decode_sector_number(&p, &be->be_f_offset) < 0)
|
goto out_put_deviceid;
|
if (decode_sector_number(&p, &be->be_length) < 0)
|
goto out_put_deviceid;
|
if (decode_sector_number(&p, &be->be_v_offset) < 0)
|
goto out_put_deviceid;
|
be->be_state = be32_to_cpup(p++);
|
|
error = verify_extent(be, lv);
|
if (error) {
|
dprintk("%s: extent verification failed\n", __func__);
|
goto out_put_deviceid;
|
}
|
|
list_add_tail(&be->be_list, extents);
|
return 0;
|
|
out_put_deviceid:
|
nfs4_put_deviceid_node(be->be_device);
|
out_free_be:
|
kfree(be);
|
return error;
|
}
|
|
static struct pnfs_layout_segment *
|
bl_alloc_lseg(struct pnfs_layout_hdr *lo, struct nfs4_layoutget_res *lgr,
|
gfp_t gfp_mask)
|
{
|
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,
|
};
|
struct pnfs_block_layout *bl = BLK_LO2EXT(lo);
|
struct pnfs_layout_segment *lseg;
|
struct xdr_buf buf;
|
struct xdr_stream xdr;
|
struct page *scratch;
|
int status, i;
|
uint32_t count;
|
__be32 *p;
|
LIST_HEAD(extents);
|
|
dprintk("---> %s\n", __func__);
|
|
lseg = kzalloc(sizeof(*lseg), gfp_mask);
|
if (!lseg)
|
return ERR_PTR(-ENOMEM);
|
|
status = -ENOMEM;
|
scratch = alloc_page(gfp_mask);
|
if (!scratch)
|
goto out;
|
|
xdr_init_decode_pages(&xdr, &buf,
|
lgr->layoutp->pages, lgr->layoutp->len);
|
xdr_set_scratch_buffer(&xdr, page_address(scratch), PAGE_SIZE);
|
|
status = -EIO;
|
p = xdr_inline_decode(&xdr, 4);
|
if (unlikely(!p))
|
goto out_free_scratch;
|
|
count = be32_to_cpup(p++);
|
dprintk("%s: number of extents %d\n", __func__, count);
|
|
/*
|
* 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++) {
|
status = bl_alloc_extent(&xdr, lo, &lv, &extents, gfp_mask);
|
if (status)
|
goto process_extents;
|
}
|
|
if (lgr->range.offset + lgr->range.length !=
|
lv.start << SECTOR_SHIFT) {
|
dprintk("%s Final length mismatch\n", __func__);
|
status = -EIO;
|
goto process_extents;
|
}
|
|
if (lv.start < lv.cowread) {
|
dprintk("%s Final uncovered COW extent\n", __func__);
|
status = -EIO;
|
}
|
|
process_extents:
|
while (!list_empty(&extents)) {
|
struct pnfs_block_extent *be =
|
list_first_entry(&extents, struct pnfs_block_extent,
|
be_list);
|
list_del(&be->be_list);
|
|
if (!status)
|
status = ext_tree_insert(bl, be);
|
|
if (status) {
|
nfs4_put_deviceid_node(be->be_device);
|
kfree(be);
|
}
|
}
|
|
out_free_scratch:
|
__free_page(scratch);
|
out:
|
dprintk("%s returns %d\n", __func__, status);
|
switch (status) {
|
case -ENODEV:
|
/* Our extent block devices are unavailable */
|
set_bit(NFS_LSEG_UNAVAILABLE, &lseg->pls_flags);
|
fallthrough;
|
case 0:
|
return lseg;
|
default:
|
kfree(lseg);
|
return ERR_PTR(status);
|
}
|
}
|
|
static void
|
bl_return_range(struct pnfs_layout_hdr *lo,
|
struct pnfs_layout_range *range)
|
{
|
struct pnfs_block_layout *bl = BLK_LO2EXT(lo);
|
sector_t offset = range->offset >> SECTOR_SHIFT, end;
|
|
if (range->offset % 8) {
|
dprintk("%s: offset %lld not block size aligned\n",
|
__func__, range->offset);
|
return;
|
}
|
|
if (range->length != NFS4_MAX_UINT64) {
|
if (range->length % 8) {
|
dprintk("%s: length %lld not block size aligned\n",
|
__func__, range->length);
|
return;
|
}
|
|
end = offset + (range->length >> SECTOR_SHIFT);
|
} else {
|
end = round_down(NFS4_MAX_UINT64, PAGE_SIZE);
|
}
|
|
ext_tree_remove(bl, range->iomode & IOMODE_RW, offset, end);
|
}
|
|
static int
|
bl_prepare_layoutcommit(struct nfs4_layoutcommit_args *arg)
|
{
|
return ext_tree_prepare_commit(arg);
|
}
|
|
static void
|
bl_cleanup_layoutcommit(struct nfs4_layoutcommit_data *lcdata)
|
{
|
ext_tree_mark_committed(&lcdata->args, lcdata->res.status);
|
}
|
|
static int
|
bl_set_layoutdriver(struct nfs_server *server, const struct nfs_fh *fh)
|
{
|
dprintk("%s enter\n", __func__);
|
|
if (server->pnfs_blksize == 0) {
|
dprintk("%s Server did not return blksize\n", __func__);
|
return -EINVAL;
|
}
|
if (server->pnfs_blksize > PAGE_SIZE) {
|
printk(KERN_ERR "%s: pNFS blksize %d not supported.\n",
|
__func__, server->pnfs_blksize);
|
return -EINVAL;
|
}
|
|
return 0;
|
}
|
|
static bool
|
is_aligned_req(struct nfs_pageio_descriptor *pgio,
|
struct nfs_page *req, unsigned int alignment, bool is_write)
|
{
|
/*
|
* Always accept buffered writes, higher layers take care of the
|
* right alignment.
|
*/
|
if (pgio->pg_dreq == NULL)
|
return true;
|
|
if (!IS_ALIGNED(req->wb_offset, alignment))
|
return false;
|
|
if (IS_ALIGNED(req->wb_bytes, alignment))
|
return true;
|
|
if (is_write &&
|
(req_offset(req) + req->wb_bytes == i_size_read(pgio->pg_inode))) {
|
/*
|
* If the write goes up to the inode size, just write
|
* the full page. Data past the inode size is
|
* guaranteed to be zeroed by the higher level client
|
* code, and this behaviour is mandated by RFC 5663
|
* section 2.3.2.
|
*/
|
return true;
|
}
|
|
return false;
|
}
|
|
static void
|
bl_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
|
{
|
if (!is_aligned_req(pgio, req, SECTOR_SIZE, false)) {
|
nfs_pageio_reset_read_mds(pgio);
|
return;
|
}
|
|
pnfs_generic_pg_init_read(pgio, req);
|
|
if (pgio->pg_lseg &&
|
test_bit(NFS_LSEG_UNAVAILABLE, &pgio->pg_lseg->pls_flags)) {
|
pnfs_error_mark_layout_for_return(pgio->pg_inode, pgio->pg_lseg);
|
pnfs_set_lo_fail(pgio->pg_lseg);
|
nfs_pageio_reset_read_mds(pgio);
|
}
|
}
|
|
/*
|
* Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
|
* of bytes (maximum @req->wb_bytes) that can be coalesced.
|
*/
|
static size_t
|
bl_pg_test_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
|
struct nfs_page *req)
|
{
|
if (!is_aligned_req(pgio, req, SECTOR_SIZE, false))
|
return 0;
|
return pnfs_generic_pg_test(pgio, prev, req);
|
}
|
|
/*
|
* Return the number of contiguous bytes for a given inode
|
* starting at page frame idx.
|
*/
|
static u64 pnfs_num_cont_bytes(struct inode *inode, pgoff_t idx)
|
{
|
struct address_space *mapping = inode->i_mapping;
|
pgoff_t end;
|
|
/* Optimize common case that writes from 0 to end of file */
|
end = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
|
if (end != inode->i_mapping->nrpages) {
|
rcu_read_lock();
|
end = page_cache_next_miss(mapping, idx + 1, ULONG_MAX);
|
rcu_read_unlock();
|
}
|
|
if (!end)
|
return i_size_read(inode) - (idx << PAGE_SHIFT);
|
else
|
return (end - idx) << PAGE_SHIFT;
|
}
|
|
static void
|
bl_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
|
{
|
u64 wb_size;
|
|
if (!is_aligned_req(pgio, req, PAGE_SIZE, true)) {
|
nfs_pageio_reset_write_mds(pgio);
|
return;
|
}
|
|
if (pgio->pg_dreq == NULL)
|
wb_size = pnfs_num_cont_bytes(pgio->pg_inode,
|
req->wb_index);
|
else
|
wb_size = nfs_dreq_bytes_left(pgio->pg_dreq);
|
|
pnfs_generic_pg_init_write(pgio, req, wb_size);
|
|
if (pgio->pg_lseg &&
|
test_bit(NFS_LSEG_UNAVAILABLE, &pgio->pg_lseg->pls_flags)) {
|
|
pnfs_error_mark_layout_for_return(pgio->pg_inode, pgio->pg_lseg);
|
pnfs_set_lo_fail(pgio->pg_lseg);
|
nfs_pageio_reset_write_mds(pgio);
|
}
|
}
|
|
/*
|
* Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
|
* of bytes (maximum @req->wb_bytes) that can be coalesced.
|
*/
|
static size_t
|
bl_pg_test_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
|
struct nfs_page *req)
|
{
|
if (!is_aligned_req(pgio, req, PAGE_SIZE, true))
|
return 0;
|
return pnfs_generic_pg_test(pgio, prev, req);
|
}
|
|
static const struct nfs_pageio_ops bl_pg_read_ops = {
|
.pg_init = bl_pg_init_read,
|
.pg_test = bl_pg_test_read,
|
.pg_doio = pnfs_generic_pg_readpages,
|
.pg_cleanup = pnfs_generic_pg_cleanup,
|
};
|
|
static const struct nfs_pageio_ops bl_pg_write_ops = {
|
.pg_init = bl_pg_init_write,
|
.pg_test = bl_pg_test_write,
|
.pg_doio = pnfs_generic_pg_writepages,
|
.pg_cleanup = pnfs_generic_pg_cleanup,
|
};
|
|
static struct pnfs_layoutdriver_type blocklayout_type = {
|
.id = LAYOUT_BLOCK_VOLUME,
|
.name = "LAYOUT_BLOCK_VOLUME",
|
.owner = THIS_MODULE,
|
.flags = PNFS_LAYOUTRET_ON_SETATTR |
|
PNFS_LAYOUTRET_ON_ERROR |
|
PNFS_READ_WHOLE_PAGE,
|
.read_pagelist = bl_read_pagelist,
|
.write_pagelist = bl_write_pagelist,
|
.alloc_layout_hdr = bl_alloc_layout_hdr,
|
.free_layout_hdr = bl_free_layout_hdr,
|
.alloc_lseg = bl_alloc_lseg,
|
.free_lseg = bl_free_lseg,
|
.return_range = bl_return_range,
|
.prepare_layoutcommit = bl_prepare_layoutcommit,
|
.cleanup_layoutcommit = bl_cleanup_layoutcommit,
|
.set_layoutdriver = bl_set_layoutdriver,
|
.alloc_deviceid_node = bl_alloc_deviceid_node,
|
.free_deviceid_node = bl_free_deviceid_node,
|
.pg_read_ops = &bl_pg_read_ops,
|
.pg_write_ops = &bl_pg_write_ops,
|
.sync = pnfs_generic_sync,
|
};
|
|
static struct pnfs_layoutdriver_type scsilayout_type = {
|
.id = LAYOUT_SCSI,
|
.name = "LAYOUT_SCSI",
|
.owner = THIS_MODULE,
|
.flags = PNFS_LAYOUTRET_ON_SETATTR |
|
PNFS_LAYOUTRET_ON_ERROR |
|
PNFS_READ_WHOLE_PAGE,
|
.read_pagelist = bl_read_pagelist,
|
.write_pagelist = bl_write_pagelist,
|
.alloc_layout_hdr = sl_alloc_layout_hdr,
|
.free_layout_hdr = bl_free_layout_hdr,
|
.alloc_lseg = bl_alloc_lseg,
|
.free_lseg = bl_free_lseg,
|
.return_range = bl_return_range,
|
.prepare_layoutcommit = bl_prepare_layoutcommit,
|
.cleanup_layoutcommit = bl_cleanup_layoutcommit,
|
.set_layoutdriver = bl_set_layoutdriver,
|
.alloc_deviceid_node = bl_alloc_deviceid_node,
|
.free_deviceid_node = bl_free_deviceid_node,
|
.pg_read_ops = &bl_pg_read_ops,
|
.pg_write_ops = &bl_pg_write_ops,
|
.sync = pnfs_generic_sync,
|
};
|
|
|
static int __init nfs4blocklayout_init(void)
|
{
|
int ret;
|
|
dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__);
|
|
ret = bl_init_pipefs();
|
if (ret)
|
goto out;
|
|
ret = pnfs_register_layoutdriver(&blocklayout_type);
|
if (ret)
|
goto out_cleanup_pipe;
|
|
ret = pnfs_register_layoutdriver(&scsilayout_type);
|
if (ret)
|
goto out_unregister_block;
|
return 0;
|
|
out_unregister_block:
|
pnfs_unregister_layoutdriver(&blocklayout_type);
|
out_cleanup_pipe:
|
bl_cleanup_pipefs();
|
out:
|
return ret;
|
}
|
|
static void __exit nfs4blocklayout_exit(void)
|
{
|
dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n",
|
__func__);
|
|
pnfs_unregister_layoutdriver(&scsilayout_type);
|
pnfs_unregister_layoutdriver(&blocklayout_type);
|
bl_cleanup_pipefs();
|
}
|
|
MODULE_ALIAS("nfs-layouttype4-3");
|
MODULE_ALIAS("nfs-layouttype4-5");
|
|
module_init(nfs4blocklayout_init);
|
module_exit(nfs4blocklayout_exit);
|
