WSL2-Linux-Kernel/fs/nfs/blocklayout/blocklayout.c

1025 строки
27 KiB
C

/*
* 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/buffer_head.h> /* various write calls */
#include <linux/prefetch.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");
struct dentry *bl_device_pipe;
wait_queue_head_t bl_wq;
static void print_page(struct page *page)
{
dprintk("PRINTPAGE page %p\n", page);
dprintk(" PagePrivate %d\n", PagePrivate(page));
dprintk(" PageUptodate %d\n", PageUptodate(page));
dprintk(" PageError %d\n", PageError(page));
dprintk(" PageDirty %d\n", PageDirty(page));
dprintk(" PageReferenced %d\n", PageReferenced(page));
dprintk(" PageLocked %d\n", PageLocked(page));
dprintk(" PageWriteback %d\n", PageWriteback(page));
dprintk(" PageMappedToDisk %d\n", PageMappedToDisk(page));
dprintk("\n");
}
/* Given the be associated with isect, determine if page data needs to be
* initialized.
*/
static int is_hole(struct pnfs_block_extent *be, sector_t isect)
{
if (be->be_state == PNFS_BLOCK_NONE_DATA)
return 1;
else if (be->be_state != PNFS_BLOCK_INVALID_DATA)
return 0;
else
return !bl_is_sector_init(be->be_inval, isect);
}
/* Given the be associated with isect, determine if page data can be
* written to disk.
*/
static int is_writable(struct pnfs_block_extent *be, sector_t isect)
{
return (be->be_state == PNFS_BLOCK_READWRITE_DATA ||
be->be_state == PNFS_BLOCK_INVALID_DATA);
}
/* 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;
struct rpc_call_ops call_ops;
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(int rw, struct bio *bio)
{
if (bio) {
get_parallel(bio->bi_private);
dprintk("%s submitting %s bio %u@%llu\n", __func__,
rw == READ ? "read" : "write",
bio->bi_size, (unsigned long long)bio->bi_sector);
submit_bio(rw, bio);
}
return NULL;
}
static struct bio *bl_alloc_init_bio(int npg, sector_t isect,
struct pnfs_block_extent *be,
void (*end_io)(struct bio *, int err),
struct parallel_io *par)
{
struct bio *bio;
bio = bio_alloc(GFP_NOIO, npg);
if (!bio)
return NULL;
bio->bi_sector = isect - be->be_f_offset + be->be_v_offset;
bio->bi_bdev = be->be_mdev;
bio->bi_end_io = end_io;
bio->bi_private = par;
return bio;
}
static struct bio *bl_add_page_to_bio(struct bio *bio, int npg, int rw,
sector_t isect, struct page *page,
struct pnfs_block_extent *be,
void (*end_io)(struct bio *, int err),
struct parallel_io *par)
{
retry:
if (!bio) {
bio = bl_alloc_init_bio(npg, isect, be, end_io, par);
if (!bio)
return ERR_PTR(-ENOMEM);
}
if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) {
bio = bl_submit_bio(rw, bio);
goto retry;
}
return bio;
}
/* This is basically copied from mpage_end_io_read */
static void bl_end_io_read(struct bio *bio, int err)
{
struct parallel_io *par = bio->bi_private;
const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
struct nfs_read_data *rdata = (struct nfs_read_data *)par->data;
do {
struct page *page = bvec->bv_page;
if (--bvec >= bio->bi_io_vec)
prefetchw(&bvec->bv_page->flags);
if (uptodate)
SetPageUptodate(page);
} while (bvec >= bio->bi_io_vec);
if (!uptodate) {
if (!rdata->pnfs_error)
rdata->pnfs_error = -EIO;
pnfs_set_lo_fail(rdata->lseg);
}
bio_put(bio);
put_parallel(par);
}
static void bl_read_cleanup(struct work_struct *work)
{
struct rpc_task *task;
struct nfs_read_data *rdata;
dprintk("%s enter\n", __func__);
task = container_of(work, struct rpc_task, u.tk_work);
rdata = container_of(task, struct nfs_read_data, task);
pnfs_ld_read_done(rdata);
}
static void
bl_end_par_io_read(void *data)
{
struct nfs_read_data *rdata = data;
INIT_WORK(&rdata->task.u.tk_work, bl_read_cleanup);
schedule_work(&rdata->task.u.tk_work);
}
/* We don't want normal .rpc_call_done callback used, so we replace it
* with this stub.
*/
static void bl_rpc_do_nothing(struct rpc_task *task, void *calldata)
{
return;
}
static enum pnfs_try_status
bl_read_pagelist(struct nfs_read_data *rdata)
{
int i, hole;
struct bio *bio = NULL;
struct pnfs_block_extent *be = NULL, *cow_read = NULL;
sector_t isect, extent_length = 0;
struct parallel_io *par;
loff_t f_offset = rdata->args.offset;
size_t count = rdata->args.count;
struct page **pages = rdata->args.pages;
int pg_index = rdata->args.pgbase >> PAGE_CACHE_SHIFT;
dprintk("%s enter nr_pages %u offset %lld count %Zd\n", __func__,
rdata->npages, f_offset, count);
par = alloc_parallel(rdata);
if (!par)
goto use_mds;
par->call_ops = *rdata->mds_ops;
par->call_ops.rpc_call_done = bl_rpc_do_nothing;
par->pnfs_callback = bl_end_par_io_read;
/* At this point, we can no longer jump to use_mds */
isect = (sector_t) (f_offset >> SECTOR_SHIFT);
/* Code assumes extents are page-aligned */
for (i = pg_index; i < rdata->npages; i++) {
if (!extent_length) {
/* We've used up the previous extent */
bl_put_extent(be);
bl_put_extent(cow_read);
bio = bl_submit_bio(READ, bio);
/* Get the next one */
be = bl_find_get_extent(BLK_LSEG2EXT(rdata->lseg),
isect, &cow_read);
if (!be) {
rdata->pnfs_error = -EIO;
goto out;
}
extent_length = be->be_length -
(isect - be->be_f_offset);
if (cow_read) {
sector_t cow_length = cow_read->be_length -
(isect - cow_read->be_f_offset);
extent_length = min(extent_length, cow_length);
}
}
hole = is_hole(be, isect);
if (hole && !cow_read) {
bio = bl_submit_bio(READ, bio);
/* Fill hole w/ zeroes w/o accessing device */
dprintk("%s Zeroing page for hole\n", __func__);
zero_user_segment(pages[i], 0, PAGE_CACHE_SIZE);
print_page(pages[i]);
SetPageUptodate(pages[i]);
} else {
struct pnfs_block_extent *be_read;
be_read = (hole && cow_read) ? cow_read : be;
bio = bl_add_page_to_bio(bio, rdata->npages - i, READ,
isect, pages[i], be_read,
bl_end_io_read, par);
if (IS_ERR(bio)) {
rdata->pnfs_error = PTR_ERR(bio);
bio = NULL;
goto out;
}
}
isect += PAGE_CACHE_SECTORS;
extent_length -= PAGE_CACHE_SECTORS;
}
if ((isect << SECTOR_SHIFT) >= rdata->inode->i_size) {
rdata->res.eof = 1;
rdata->res.count = rdata->inode->i_size - f_offset;
} else {
rdata->res.count = (isect << SECTOR_SHIFT) - f_offset;
}
out:
bl_put_extent(be);
bl_put_extent(cow_read);
bl_submit_bio(READ, bio);
put_parallel(par);
return PNFS_ATTEMPTED;
use_mds:
dprintk("Giving up and using normal NFS\n");
return PNFS_NOT_ATTEMPTED;
}
static void mark_extents_written(struct pnfs_block_layout *bl,
__u64 offset, __u32 count)
{
sector_t isect, end;
struct pnfs_block_extent *be;
dprintk("%s(%llu, %u)\n", __func__, offset, count);
if (count == 0)
return;
isect = (offset & (long)(PAGE_CACHE_MASK)) >> SECTOR_SHIFT;
end = (offset + count + PAGE_CACHE_SIZE - 1) & (long)(PAGE_CACHE_MASK);
end >>= SECTOR_SHIFT;
while (isect < end) {
sector_t len;
be = bl_find_get_extent(bl, isect, NULL);
BUG_ON(!be); /* FIXME */
len = min(end, be->be_f_offset + be->be_length) - isect;
if (be->be_state == PNFS_BLOCK_INVALID_DATA)
bl_mark_for_commit(be, isect, len); /* What if fails? */
isect += len;
bl_put_extent(be);
}
}
static void bl_end_io_write_zero(struct bio *bio, int err)
{
struct parallel_io *par = bio->bi_private;
const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
struct nfs_write_data *wdata = (struct nfs_write_data *)par->data;
do {
struct page *page = bvec->bv_page;
if (--bvec >= bio->bi_io_vec)
prefetchw(&bvec->bv_page->flags);
/* This is the zeroing page we added */
end_page_writeback(page);
page_cache_release(page);
} while (bvec >= bio->bi_io_vec);
if (!uptodate) {
if (!wdata->pnfs_error)
wdata->pnfs_error = -EIO;
pnfs_set_lo_fail(wdata->lseg);
}
bio_put(bio);
put_parallel(par);
}
/* This is basically copied from mpage_end_io_read */
static void bl_end_io_write(struct bio *bio, int err)
{
struct parallel_io *par = bio->bi_private;
const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
struct nfs_write_data *wdata = (struct nfs_write_data *)par->data;
if (!uptodate) {
if (!wdata->pnfs_error)
wdata->pnfs_error = -EIO;
pnfs_set_lo_fail(wdata->lseg);
}
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;
struct nfs_write_data *wdata;
dprintk("%s enter\n", __func__);
task = container_of(work, struct rpc_task, u.tk_work);
wdata = container_of(task, struct nfs_write_data, task);
if (!wdata->pnfs_error) {
/* Marks for LAYOUTCOMMIT */
mark_extents_written(BLK_LSEG2EXT(wdata->lseg),
wdata->args.offset, wdata->args.count);
}
pnfs_ld_write_done(wdata);
}
/* Called when last of bios associated with a bl_write_pagelist call finishes */
static void bl_end_par_io_write(void *data)
{
struct nfs_write_data *wdata = data;
wdata->task.tk_status = 0;
wdata->verf.committed = NFS_FILE_SYNC;
INIT_WORK(&wdata->task.u.tk_work, bl_write_cleanup);
schedule_work(&wdata->task.u.tk_work);
}
/* FIXME STUB - mark intersection of layout and page as bad, so is not
* used again.
*/
static void mark_bad_read(void)
{
return;
}
/*
* map_block: map a requested I/0 block (isect) into an offset in the LVM
* block_device
*/
static void
map_block(struct buffer_head *bh, sector_t isect, struct pnfs_block_extent *be)
{
dprintk("%s enter be=%p\n", __func__, be);
set_buffer_mapped(bh);
bh->b_bdev = be->be_mdev;
bh->b_blocknr = (isect - be->be_f_offset + be->be_v_offset) >>
(be->be_mdev->bd_inode->i_blkbits - SECTOR_SHIFT);
dprintk("%s isect %llu, bh->b_blocknr %ld, using bsize %Zd\n",
__func__, (unsigned long long)isect, (long)bh->b_blocknr,
bh->b_size);
return;
}
/* Given an unmapped page, zero it or read in page for COW, page is locked
* by caller.
*/
static int
init_page_for_write(struct page *page, struct pnfs_block_extent *cow_read)
{
struct buffer_head *bh = NULL;
int ret = 0;
sector_t isect;
dprintk("%s enter, %p\n", __func__, page);
BUG_ON(PageUptodate(page));
if (!cow_read) {
zero_user_segment(page, 0, PAGE_SIZE);
SetPageUptodate(page);
goto cleanup;
}
bh = alloc_page_buffers(page, PAGE_CACHE_SIZE, 0);
if (!bh) {
ret = -ENOMEM;
goto cleanup;
}
isect = (sector_t) page->index << PAGE_CACHE_SECTOR_SHIFT;
map_block(bh, isect, cow_read);
if (!bh_uptodate_or_lock(bh))
ret = bh_submit_read(bh);
if (ret)
goto cleanup;
SetPageUptodate(page);
cleanup:
bl_put_extent(cow_read);
if (bh)
free_buffer_head(bh);
if (ret) {
/* Need to mark layout with bad read...should now
* just use nfs4 for reads and writes.
*/
mark_bad_read();
}
return ret;
}
static enum pnfs_try_status
bl_write_pagelist(struct nfs_write_data *wdata, int sync)
{
int i, ret, npg_zero, pg_index, last = 0;
struct bio *bio = NULL;
struct pnfs_block_extent *be = NULL, *cow_read = NULL;
sector_t isect, last_isect = 0, extent_length = 0;
struct parallel_io *par;
loff_t offset = wdata->args.offset;
size_t count = wdata->args.count;
struct page **pages = wdata->args.pages;
struct page *page;
pgoff_t index;
u64 temp;
int npg_per_block =
NFS_SERVER(wdata->inode)->pnfs_blksize >> PAGE_CACHE_SHIFT;
dprintk("%s enter, %Zu@%lld\n", __func__, count, offset);
/* At this point, wdata->pages 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(wdata);
if (!par)
return PNFS_NOT_ATTEMPTED;
par->call_ops = *wdata->mds_ops;
par->call_ops.rpc_call_done = bl_rpc_do_nothing;
par->pnfs_callback = bl_end_par_io_write;
/* At this point, have to be more careful with error handling */
isect = (sector_t) ((offset & (long)PAGE_CACHE_MASK) >> SECTOR_SHIFT);
be = bl_find_get_extent(BLK_LSEG2EXT(wdata->lseg), isect, &cow_read);
if (!be || !is_writable(be, isect)) {
dprintk("%s no matching extents!\n", __func__);
wdata->pnfs_error = -EINVAL;
goto out;
}
/* First page inside INVALID extent */
if (be->be_state == PNFS_BLOCK_INVALID_DATA) {
temp = offset >> PAGE_CACHE_SHIFT;
npg_zero = do_div(temp, npg_per_block);
isect = (sector_t) (((offset - npg_zero * PAGE_CACHE_SIZE) &
(long)PAGE_CACHE_MASK) >> SECTOR_SHIFT);
extent_length = be->be_length - (isect - be->be_f_offset);
fill_invalid_ext:
dprintk("%s need to zero %d pages\n", __func__, npg_zero);
for (;npg_zero > 0; npg_zero--) {
if (bl_is_sector_init(be->be_inval, isect)) {
dprintk("isect %llu already init\n",
(unsigned long long)isect);
goto next_page;
}
/* page ref released in bl_end_io_write_zero */
index = isect >> PAGE_CACHE_SECTOR_SHIFT;
dprintk("%s zero %dth page: index %lu isect %llu\n",
__func__, npg_zero, index,
(unsigned long long)isect);
page =
find_or_create_page(wdata->inode->i_mapping, index,
GFP_NOFS);
if (!page) {
dprintk("%s oom\n", __func__);
wdata->pnfs_error = -ENOMEM;
goto out;
}
/* PageDirty: Other will write this out
* PageWriteback: Other is writing this out
* PageUptodate: It was read before
* sector_initialized: already written out
*/
if (PageDirty(page) || PageWriteback(page)) {
print_page(page);
unlock_page(page);
page_cache_release(page);
goto next_page;
}
if (!PageUptodate(page)) {
/* New page, readin or zero it */
init_page_for_write(page, cow_read);
}
set_page_writeback(page);
unlock_page(page);
ret = bl_mark_sectors_init(be->be_inval, isect,
PAGE_CACHE_SECTORS,
NULL);
if (unlikely(ret)) {
dprintk("%s bl_mark_sectors_init fail %d\n",
__func__, ret);
end_page_writeback(page);
page_cache_release(page);
wdata->pnfs_error = ret;
goto out;
}
bio = bl_add_page_to_bio(bio, npg_zero, WRITE,
isect, page, be,
bl_end_io_write_zero, par);
if (IS_ERR(bio)) {
wdata->pnfs_error = PTR_ERR(bio);
bio = NULL;
goto out;
}
/* FIXME: This should be done in bi_end_io */
mark_extents_written(BLK_LSEG2EXT(wdata->lseg),
page->index << PAGE_CACHE_SHIFT,
PAGE_CACHE_SIZE);
next_page:
isect += PAGE_CACHE_SECTORS;
extent_length -= PAGE_CACHE_SECTORS;
}
if (last)
goto write_done;
}
bio = bl_submit_bio(WRITE, bio);
/* Middle pages */
pg_index = wdata->args.pgbase >> PAGE_CACHE_SHIFT;
for (i = pg_index; i < wdata->npages; i++) {
if (!extent_length) {
/* We've used up the previous extent */
bl_put_extent(be);
bio = bl_submit_bio(WRITE, bio);
/* Get the next one */
be = bl_find_get_extent(BLK_LSEG2EXT(wdata->lseg),
isect, NULL);
if (!be || !is_writable(be, isect)) {
wdata->pnfs_error = -EINVAL;
goto out;
}
extent_length = be->be_length -
(isect - be->be_f_offset);
}
if (be->be_state == PNFS_BLOCK_INVALID_DATA) {
ret = bl_mark_sectors_init(be->be_inval, isect,
PAGE_CACHE_SECTORS,
NULL);
if (unlikely(ret)) {
dprintk("%s bl_mark_sectors_init fail %d\n",
__func__, ret);
wdata->pnfs_error = ret;
goto out;
}
}
bio = bl_add_page_to_bio(bio, wdata->npages - i, WRITE,
isect, pages[i], be,
bl_end_io_write, par);
if (IS_ERR(bio)) {
wdata->pnfs_error = PTR_ERR(bio);
bio = NULL;
goto out;
}
isect += PAGE_CACHE_SECTORS;
last_isect = isect;
extent_length -= PAGE_CACHE_SECTORS;
}
/* Last page inside INVALID extent */
if (be->be_state == PNFS_BLOCK_INVALID_DATA) {
bio = bl_submit_bio(WRITE, bio);
temp = last_isect >> PAGE_CACHE_SECTOR_SHIFT;
npg_zero = npg_per_block - do_div(temp, npg_per_block);
if (npg_zero < npg_per_block) {
last = 1;
goto fill_invalid_ext;
}
}
write_done:
wdata->res.count = (last_isect << SECTOR_SHIFT) - (offset);
if (count < wdata->res.count) {
wdata->res.count = count;
}
out:
bl_put_extent(be);
bl_submit_bio(WRITE, bio);
put_parallel(par);
return PNFS_ATTEMPTED;
}
/* FIXME - range ignored */
static void
release_extents(struct pnfs_block_layout *bl, struct pnfs_layout_range *range)
{
int i;
struct pnfs_block_extent *be;
spin_lock(&bl->bl_ext_lock);
for (i = 0; i < EXTENT_LISTS; i++) {
while (!list_empty(&bl->bl_extents[i])) {
be = list_first_entry(&bl->bl_extents[i],
struct pnfs_block_extent,
be_node);
list_del(&be->be_node);
bl_put_extent(be);
}
}
spin_unlock(&bl->bl_ext_lock);
}
static void
release_inval_marks(struct pnfs_inval_markings *marks)
{
struct pnfs_inval_tracking *pos, *temp;
list_for_each_entry_safe(pos, temp, &marks->im_tree.mtt_stub, it_link) {
list_del(&pos->it_link);
kfree(pos);
}
return;
}
static void bl_free_layout_hdr(struct pnfs_layout_hdr *lo)
{
struct pnfs_block_layout *bl = BLK_LO2EXT(lo);
dprintk("%s enter\n", __func__);
release_extents(bl, NULL);
release_inval_marks(&bl->bl_inval);
kfree(bl);
}
static struct pnfs_layout_hdr *bl_alloc_layout_hdr(struct inode *inode,
gfp_t gfp_flags)
{
struct pnfs_block_layout *bl;
dprintk("%s enter\n", __func__);
bl = kzalloc(sizeof(*bl), gfp_flags);
if (!bl)
return NULL;
spin_lock_init(&bl->bl_ext_lock);
INIT_LIST_HEAD(&bl->bl_extents[0]);
INIT_LIST_HEAD(&bl->bl_extents[1]);
INIT_LIST_HEAD(&bl->bl_commit);
INIT_LIST_HEAD(&bl->bl_committing);
bl->bl_count = 0;
bl->bl_blocksize = NFS_SERVER(inode)->pnfs_blksize >> SECTOR_SHIFT;
BL_INIT_INVAL_MARKS(&bl->bl_inval, bl->bl_blocksize);
return &bl->bl_layout;
}
static void bl_free_lseg(struct pnfs_layout_segment *lseg)
{
dprintk("%s enter\n", __func__);
kfree(lseg);
}
/* We pretty much ignore lseg, and store all data layout wide, so we
* can correctly merge.
*/
static struct pnfs_layout_segment *bl_alloc_lseg(struct pnfs_layout_hdr *lo,
struct nfs4_layoutget_res *lgr,
gfp_t gfp_flags)
{
struct pnfs_layout_segment *lseg;
int status;
dprintk("%s enter\n", __func__);
lseg = kzalloc(sizeof(*lseg), gfp_flags);
if (!lseg)
return ERR_PTR(-ENOMEM);
status = nfs4_blk_process_layoutget(lo, lgr, gfp_flags);
if (status) {
/* We don't want to call the full-blown bl_free_lseg,
* since on error extents were not touched.
*/
kfree(lseg);
return ERR_PTR(status);
}
return lseg;
}
static void
bl_encode_layoutcommit(struct pnfs_layout_hdr *lo, struct xdr_stream *xdr,
const struct nfs4_layoutcommit_args *arg)
{
dprintk("%s enter\n", __func__);
encode_pnfs_block_layoutupdate(BLK_LO2EXT(lo), xdr, arg);
}
static void
bl_cleanup_layoutcommit(struct nfs4_layoutcommit_data *lcdata)
{
struct pnfs_layout_hdr *lo = NFS_I(lcdata->args.inode)->layout;
dprintk("%s enter\n", __func__);
clean_pnfs_block_layoutupdate(BLK_LO2EXT(lo), &lcdata->args, lcdata->res.status);
}
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;
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 ERR_PTR(-ENOMEM);
}
pages = kzalloc(max_pages * sizeof(struct page *), GFP_NOFS);
if (pages == NULL) {
kfree(dev);
return ERR_PTR(-ENOMEM);
}
for (i = 0; i < max_pages; i++) {
pages[i] = alloc_page(GFP_NOFS);
if (!pages[i]) {
rv = ERR_PTR(-ENOMEM);
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) {
rv = ERR_PTR(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, i;
dprintk("%s enter\n", __func__);
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 (IS_ERR(bdev)) {
status = PTR_ERR(bdev);
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;
}
static const struct nfs_pageio_ops bl_pg_read_ops = {
.pg_init = pnfs_generic_pg_init_read,
.pg_test = pnfs_generic_pg_test,
.pg_doio = pnfs_generic_pg_readpages,
};
static const struct nfs_pageio_ops bl_pg_write_ops = {
.pg_init = pnfs_generic_pg_init_write,
.pg_test = pnfs_generic_pg_test,
.pg_doio = pnfs_generic_pg_writepages,
};
static struct pnfs_layoutdriver_type blocklayout_type = {
.id = LAYOUT_BLOCK_VOLUME,
.name = "LAYOUT_BLOCK_VOLUME",
.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,
.encode_layoutcommit = bl_encode_layoutcommit,
.cleanup_layoutcommit = bl_cleanup_layoutcommit,
.set_layoutdriver = bl_set_layoutdriver,
.clear_layoutdriver = bl_clear_layoutdriver,
.pg_read_ops = &bl_pg_read_ops,
.pg_write_ops = &bl_pg_write_ops,
};
static const struct rpc_pipe_ops bl_upcall_ops = {
.upcall = rpc_pipe_generic_upcall,
.downcall = bl_pipe_downcall,
.destroy_msg = bl_pipe_destroy_msg,
};
static int __init nfs4blocklayout_init(void)
{
struct vfsmount *mnt;
struct path path;
int ret;
dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__);
ret = pnfs_register_layoutdriver(&blocklayout_type);
if (ret)
goto out;
init_waitqueue_head(&bl_wq);
mnt = rpc_get_mount();
if (IS_ERR(mnt)) {
ret = PTR_ERR(mnt);
goto out_remove;
}
ret = vfs_path_lookup(mnt->mnt_root,
mnt,
NFS_PIPE_DIRNAME, 0, &path);
if (ret)
goto out_putrpc;
bl_device_pipe = rpc_mkpipe(path.dentry, "blocklayout", NULL,
&bl_upcall_ops, 0);
path_put(&path);
if (IS_ERR(bl_device_pipe)) {
ret = PTR_ERR(bl_device_pipe);
goto out_putrpc;
}
out:
return ret;
out_putrpc:
rpc_put_mount();
out_remove:
pnfs_unregister_layoutdriver(&blocklayout_type);
return ret;
}
static void __exit nfs4blocklayout_exit(void)
{
dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n",
__func__);
pnfs_unregister_layoutdriver(&blocklayout_type);
rpc_unlink(bl_device_pipe);
rpc_put_mount();
}
MODULE_ALIAS("nfs-layouttype4-3");
module_init(nfs4blocklayout_init);
module_exit(nfs4blocklayout_exit);