| /* |
| * 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 <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 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; |
| void (*pnfs_callback) (void *data, int num_se); |
| void *data; |
| int bse_count; |
| }; |
| |
| 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); |
| rv->bse_count = 0; |
| } |
| 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, p->bse_count); |
| 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; |
| |
| 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_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 *do_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, |
| unsigned int offset, int len) |
| { |
| isect = isect + (offset >> SECTOR_SHIFT); |
| dprintk("%s: npg %d rw %d isect %llu offset %u len %d\n", __func__, |
| npg, rw, (unsigned long long)isect, offset, len); |
| 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, len, offset) < len) { |
| bio = bl_submit_bio(rw, bio); |
| goto retry; |
| } |
| 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) |
| { |
| return do_add_page_to_bio(bio, npg, rw, isect, page, be, |
| end_io, par, 0, PAGE_CACHE_SIZE); |
| } |
| |
| /* 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; |
| |
| 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) { |
| struct nfs_read_data *rdata = par->data; |
| struct nfs_pgio_header *header = rdata->header; |
| |
| if (!header->pnfs_error) |
| header->pnfs_error = -EIO; |
| pnfs_set_lo_fail(header->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, int unused) |
| { |
| struct nfs_read_data *rdata = data; |
| |
| rdata->task.tk_status = rdata->header->pnfs_error; |
| INIT_WORK(&rdata->task.u.tk_work, bl_read_cleanup); |
| schedule_work(&rdata->task.u.tk_work); |
| } |
| |
| static enum pnfs_try_status |
| bl_read_pagelist(struct nfs_read_data *rdata) |
| { |
| struct nfs_pgio_header *header = rdata->header; |
| 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 bytes_left = rdata->args.count; |
| unsigned int pg_offset, pg_len; |
| struct page **pages = rdata->args.pages; |
| int pg_index = rdata->args.pgbase >> PAGE_CACHE_SHIFT; |
| const bool is_dio = (header->dreq != NULL); |
| |
| dprintk("%s enter nr_pages %u offset %lld count %u\n", __func__, |
| rdata->pages.npages, f_offset, (unsigned int)rdata->args.count); |
| |
| par = alloc_parallel(rdata); |
| if (!par) |
| goto use_mds; |
| 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->pages.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(header->lseg), |
| isect, &cow_read); |
| if (!be) { |
| header->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); |
| } |
| } |
| |
| if (is_dio) { |
| pg_offset = f_offset & ~PAGE_CACHE_MASK; |
| if (pg_offset + bytes_left > PAGE_CACHE_SIZE) |
| pg_len = PAGE_CACHE_SIZE - pg_offset; |
| else |
| pg_len = bytes_left; |
| |
| f_offset += pg_len; |
| bytes_left -= pg_len; |
| isect += (pg_offset >> SECTOR_SHIFT); |
| } else { |
| pg_offset = 0; |
| pg_len = PAGE_CACHE_SIZE; |
| } |
| |
| 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], pg_offset, pg_len); |
| print_page(pages[i]); |
| SetPageUptodate(pages[i]); |
| } else { |
| struct pnfs_block_extent *be_read; |
| |
| be_read = (hole && cow_read) ? cow_read : be; |
| bio = do_add_page_to_bio(bio, rdata->pages.npages - i, |
| READ, |
| isect, pages[i], be_read, |
| 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 -= PAGE_CACHE_SECTORS; |
| } |
| if ((isect << SECTOR_SHIFT) >= header->inode->i_size) { |
| rdata->res.eof = 1; |
| rdata->res.count = header->inode->i_size - rdata->args.offset; |
| } else { |
| rdata->res.count = (isect << SECTOR_SHIFT) - rdata->args.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; |
| struct pnfs_block_short_extent *se; |
| |
| 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) { |
| se = bl_pop_one_short_extent(be->be_inval); |
| BUG_ON(!se); |
| bl_mark_for_commit(be, isect, len, se); |
| } |
| 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; |
| |
| 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 (unlikely(!uptodate)) { |
| struct nfs_write_data *data = par->data; |
| struct nfs_pgio_header *header = data->header; |
| |
| if (!header->pnfs_error) |
| header->pnfs_error = -EIO; |
| pnfs_set_lo_fail(header->lseg); |
| } |
| bio_put(bio); |
| put_parallel(par); |
| } |
| |
| 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 *data = par->data; |
| struct nfs_pgio_header *header = data->header; |
| |
| if (!uptodate) { |
| if (!header->pnfs_error) |
| header->pnfs_error = -EIO; |
| pnfs_set_lo_fail(header->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 (likely(!wdata->header->pnfs_error)) { |
| /* Marks for LAYOUTCOMMIT */ |
| mark_extents_written(BLK_LSEG2EXT(wdata->header->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, int num_se) |
| { |
| struct nfs_write_data *wdata = data; |
| |
| if (unlikely(wdata->header->pnfs_error)) { |
| bl_free_short_extents(&BLK_LSEG2EXT(wdata->header->lseg)->bl_inval, |
| num_se); |
| } |
| |
| wdata->task.tk_status = wdata->header->pnfs_error; |
| 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; |
| } |
| |
| static void |
| bl_read_single_end_io(struct bio *bio, int error) |
| { |
| struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
| struct page *page = bvec->bv_page; |
| |
| /* Only one page in bvec */ |
| unlock_page(page); |
| } |
| |
| static int |
| bl_do_readpage_sync(struct page *page, struct pnfs_block_extent *be, |
| unsigned int offset, unsigned int len) |
| { |
| struct bio *bio; |
| struct page *shadow_page; |
| sector_t isect; |
| char *kaddr, *kshadow_addr; |
| int ret = 0; |
| |
| dprintk("%s: offset %u len %u\n", __func__, offset, len); |
| |
| shadow_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); |
| if (shadow_page == NULL) |
| return -ENOMEM; |
| |
| bio = bio_alloc(GFP_NOIO, 1); |
| if (bio == NULL) |
| return -ENOMEM; |
| |
| isect = (page->index << PAGE_CACHE_SECTOR_SHIFT) + |
| (offset / SECTOR_SIZE); |
| |
| bio->bi_sector = isect - be->be_f_offset + be->be_v_offset; |
| bio->bi_bdev = be->be_mdev; |
| bio->bi_end_io = bl_read_single_end_io; |
| |
| lock_page(shadow_page); |
| if (bio_add_page(bio, shadow_page, |
| SECTOR_SIZE, round_down(offset, SECTOR_SIZE)) == 0) { |
| unlock_page(shadow_page); |
| bio_put(bio); |
| return -EIO; |
| } |
| |
| submit_bio(READ, bio); |
| wait_on_page_locked(shadow_page); |
| if (unlikely(!test_bit(BIO_UPTODATE, &bio->bi_flags))) { |
| ret = -EIO; |
| } else { |
| kaddr = kmap_atomic(page); |
| kshadow_addr = kmap_atomic(shadow_page); |
| memcpy(kaddr + offset, kshadow_addr + offset, len); |
| kunmap_atomic(kshadow_addr); |
| kunmap_atomic(kaddr); |
| } |
| __free_page(shadow_page); |
| bio_put(bio); |
| |
| return ret; |
| } |
| |
| static int |
| bl_read_partial_page_sync(struct page *page, struct pnfs_block_extent *be, |
| unsigned int dirty_offset, unsigned int dirty_len, |
| bool full_page) |
| { |
| int ret = 0; |
| unsigned int start, end; |
| |
| if (full_page) { |
| start = 0; |
| end = PAGE_CACHE_SIZE; |
| } else { |
| start = round_down(dirty_offset, SECTOR_SIZE); |
| end = round_up(dirty_offset + dirty_len, SECTOR_SIZE); |
| } |
| |
| dprintk("%s: offset %u len %d\n", __func__, dirty_offset, dirty_len); |
| if (!be) { |
| zero_user_segments(page, start, dirty_offset, |
| dirty_offset + dirty_len, end); |
| if (start == 0 && end == PAGE_CACHE_SIZE && |
| trylock_page(page)) { |
| SetPageUptodate(page); |
| unlock_page(page); |
| } |
| return ret; |
| } |
| |
| if (start != dirty_offset) |
| ret = bl_do_readpage_sync(page, be, start, dirty_offset - start); |
| |
| if (!ret && (dirty_offset + dirty_len < end)) |
| ret = bl_do_readpage_sync(page, be, dirty_offset + dirty_len, |
| end - dirty_offset - dirty_len); |
| |
| return ret; |
| } |
| |
| /* 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: |
| 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; |
| } |
| |
| /* Find or create a zeroing page marked being writeback. |
| * Return ERR_PTR on error, NULL to indicate skip this page and page itself |
| * to indicate write out. |
| */ |
| static struct page * |
| bl_find_get_zeroing_page(struct inode *inode, pgoff_t index, |
| struct pnfs_block_extent *cow_read) |
| { |
| struct page *page; |
| int locked = 0; |
| page = find_get_page(inode->i_mapping, index); |
| if (page) |
| goto check_page; |
| |
| page = find_or_create_page(inode->i_mapping, index, GFP_NOFS); |
| if (unlikely(!page)) { |
| dprintk("%s oom\n", __func__); |
| return ERR_PTR(-ENOMEM); |
| } |
| locked = 1; |
| |
| check_page: |
| /* PageDirty: Other will write this out |
| * PageWriteback: Other is writing this out |
| * PageUptodate: It was read before |
| */ |
| if (PageDirty(page) || PageWriteback(page)) { |
| print_page(page); |
| if (locked) |
| unlock_page(page); |
| page_cache_release(page); |
| return NULL; |
| } |
| |
| if (!locked) { |
| lock_page(page); |
| locked = 1; |
| goto check_page; |
| } |
| if (!PageUptodate(page)) { |
| /* New page, readin or zero it */ |
| init_page_for_write(page, cow_read); |
| } |
| set_page_writeback(page); |
| unlock_page(page); |
| |
| return page; |
| } |
| |
| static enum pnfs_try_status |
| bl_write_pagelist(struct nfs_write_data *wdata, int sync) |
| { |
| struct nfs_pgio_header *header = wdata->header; |
| 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 = NULL; |
| loff_t offset = wdata->args.offset; |
| size_t count = wdata->args.count; |
| unsigned int pg_offset, pg_len, saved_len; |
| struct page **pages = wdata->args.pages; |
| struct page *page; |
| pgoff_t index; |
| u64 temp; |
| int npg_per_block = |
| NFS_SERVER(header->inode)->pnfs_blksize >> PAGE_CACHE_SHIFT; |
| |
| dprintk("%s enter, %Zu@%lld\n", __func__, count, offset); |
| |
| if (header->dreq != NULL && |
| (!IS_ALIGNED(offset, NFS_SERVER(header->inode)->pnfs_blksize) || |
| !IS_ALIGNED(count, NFS_SERVER(header->inode)->pnfs_blksize))) { |
| dprintk("pnfsblock nonblock aligned DIO writes. Resend MDS\n"); |
| goto out_mds; |
| } |
| /* 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) |
| goto out_mds; |
| 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(header->lseg), isect, &cow_read); |
| if (!be || !is_writable(be, isect)) { |
| dprintk("%s no matching extents!\n", __func__); |
| goto out_mds; |
| } |
| |
| /* First page inside INVALID extent */ |
| if (be->be_state == PNFS_BLOCK_INVALID_DATA) { |
| if (likely(!bl_push_one_short_extent(be->be_inval))) |
| par->bse_count++; |
| else |
| goto out_mds; |
| 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 = bl_find_get_zeroing_page(header->inode, index, |
| cow_read); |
| if (unlikely(IS_ERR(page))) { |
| header->pnfs_error = PTR_ERR(page); |
| goto out; |
| } else if (page == NULL) |
| goto next_page; |
| |
| ret = bl_mark_sectors_init(be->be_inval, isect, |
| PAGE_CACHE_SECTORS); |
| if (unlikely(ret)) { |
| dprintk("%s bl_mark_sectors_init fail %d\n", |
| __func__, ret); |
| end_page_writeback(page); |
| page_cache_release(page); |
| header->pnfs_error = ret; |
| goto out; |
| } |
| if (likely(!bl_push_one_short_extent(be->be_inval))) |
| par->bse_count++; |
| else { |
| end_page_writeback(page); |
| page_cache_release(page); |
| header->pnfs_error = -ENOMEM; |
| goto out; |
| } |
| /* FIXME: This should be done in bi_end_io */ |
| mark_extents_written(BLK_LSEG2EXT(header->lseg), |
| page->index << PAGE_CACHE_SHIFT, |
| PAGE_CACHE_SIZE); |
| |
| bio = bl_add_page_to_bio(bio, npg_zero, WRITE, |
| isect, page, be, |
| bl_end_io_write_zero, par); |
| if (IS_ERR(bio)) { |
| header->pnfs_error = PTR_ERR(bio); |
| bio = NULL; |
| goto out; |
| } |
| 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->pages.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(WRITE, bio); |
| /* Get the next one */ |
| be = bl_find_get_extent(BLK_LSEG2EXT(header->lseg), |
| isect, &cow_read); |
| if (!be || !is_writable(be, isect)) { |
| header->pnfs_error = -EINVAL; |
| goto out; |
| } |
| if (be->be_state == PNFS_BLOCK_INVALID_DATA) { |
| if (likely(!bl_push_one_short_extent( |
| be->be_inval))) |
| par->bse_count++; |
| else { |
| header->pnfs_error = -ENOMEM; |
| goto out; |
| } |
| } |
| extent_length = be->be_length - |
| (isect - be->be_f_offset); |
| } |
| |
| dprintk("%s offset %lld count %Zu\n", __func__, offset, count); |
| pg_offset = offset & ~PAGE_CACHE_MASK; |
| if (pg_offset + count > PAGE_CACHE_SIZE) |
| pg_len = PAGE_CACHE_SIZE - pg_offset; |
| else |
| pg_len = count; |
| |
| saved_len = pg_len; |
| if (be->be_state == PNFS_BLOCK_INVALID_DATA && |
| !bl_is_sector_init(be->be_inval, isect)) { |
| ret = bl_read_partial_page_sync(pages[i], cow_read, |
| pg_offset, pg_len, true); |
| if (ret) { |
| dprintk("%s bl_read_partial_page_sync fail %d\n", |
| __func__, ret); |
| header->pnfs_error = ret; |
| goto out; |
| } |
| |
| ret = bl_mark_sectors_init(be->be_inval, isect, |
| PAGE_CACHE_SECTORS); |
| if (unlikely(ret)) { |
| dprintk("%s bl_mark_sectors_init fail %d\n", |
| __func__, ret); |
| header->pnfs_error = ret; |
| goto out; |
| } |
| |
| /* Expand to full page write */ |
| pg_offset = 0; |
| pg_len = PAGE_CACHE_SIZE; |
| } else if ((pg_offset & (SECTOR_SIZE - 1)) || |
| (pg_len & (SECTOR_SIZE - 1))){ |
| /* ahh, nasty case. We have to do sync full sector |
| * read-modify-write cycles. |
| */ |
| unsigned int saved_offset = pg_offset; |
| ret = bl_read_partial_page_sync(pages[i], be, pg_offset, |
| pg_len, false); |
| pg_offset = round_down(pg_offset, SECTOR_SIZE); |
| pg_len = round_up(saved_offset + pg_len, SECTOR_SIZE) |
| - pg_offset; |
| } |
| |
| |
| bio = do_add_page_to_bio(bio, wdata->pages.npages - i, WRITE, |
| isect, pages[i], be, |
| bl_end_io_write, par, |
| pg_offset, pg_len); |
| if (IS_ERR(bio)) { |
| header->pnfs_error = PTR_ERR(bio); |
| bio = NULL; |
| goto out; |
| } |
| offset += saved_len; |
| count -= saved_len; |
| 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 = wdata->args.count; |
| out: |
| bl_put_extent(be); |
| bl_put_extent(cow_read); |
| bl_submit_bio(WRITE, bio); |
| put_parallel(par); |
| return PNFS_ATTEMPTED; |
| out_mds: |
| bl_put_extent(be); |
| bl_put_extent(cow_read); |
| kfree(par); |
| return PNFS_NOT_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; |
| struct pnfs_block_short_extent *se, *stemp; |
| |
| list_for_each_entry_safe(pos, temp, &marks->im_tree.mtt_stub, it_link) { |
| list_del(&pos->it_link); |
| kfree(pos); |
| } |
| |
| list_for_each_entry_safe(se, stemp, &marks->im_extents, bse_node) { |
| list_del(&se->bse_node); |
| kfree(se); |
| } |
| 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, *tmp; |
| |
| /* No need to take bm_lock as we are last user freeing bm_devlist */ |
| list_for_each_entry_safe(dev, tmp, &mid->bm_devlist, bm_node) { |
| list_del(&dev->bm_node); |
| bl_free_block_dev(dev); |
| } |
| kfree(mid); |
| } |
| } |
| |
| /* This is mostly copied from the filelayout_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 = nfs_page_array_len(0, max_resp_sz); |
| 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 bool |
| is_aligned_req(struct nfs_page *req, unsigned int alignment) |
| { |
| return IS_ALIGNED(req->wb_offset, alignment) && |
| IS_ALIGNED(req->wb_bytes, alignment); |
| } |
| |
| static void |
| bl_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) |
| { |
| if (pgio->pg_dreq != NULL && |
| !is_aligned_req(req, SECTOR_SIZE)) |
| nfs_pageio_reset_read_mds(pgio); |
| else |
| pnfs_generic_pg_init_read(pgio, req); |
| } |
| |
| static bool |
| bl_pg_test_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, |
| struct nfs_page *req) |
| { |
| if (pgio->pg_dreq != NULL && |
| !is_aligned_req(req, SECTOR_SIZE)) |
| return false; |
| |
| 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_CACHE_SIZE); |
| if (end != NFS_I(inode)->npages) { |
| rcu_read_lock(); |
| end = radix_tree_next_hole(&mapping->page_tree, idx + 1, ULONG_MAX); |
| rcu_read_unlock(); |
| } |
| |
| if (!end) |
| return i_size_read(inode) - (idx << PAGE_CACHE_SHIFT); |
| else |
| return (end - idx) << PAGE_CACHE_SHIFT; |
| } |
| |
| static void |
| bl_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) |
| { |
| if (pgio->pg_dreq != NULL && |
| !is_aligned_req(req, PAGE_CACHE_SIZE)) { |
| nfs_pageio_reset_write_mds(pgio); |
| } else { |
| u64 wb_size; |
| 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); |
| } |
| } |
| |
| static bool |
| bl_pg_test_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, |
| struct nfs_page *req) |
| { |
| if (pgio->pg_dreq != NULL && |
| !is_aligned_req(req, PAGE_CACHE_SIZE)) |
| return false; |
| |
| 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, |
| }; |
| |
| 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, |
| }; |
| |
| 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 struct dentry *nfs4blocklayout_register_sb(struct super_block *sb, |
| struct rpc_pipe *pipe) |
| { |
| struct dentry *dir, *dentry; |
| |
| dir = rpc_d_lookup_sb(sb, NFS_PIPE_DIRNAME); |
| if (dir == NULL) |
| return ERR_PTR(-ENOENT); |
| dentry = rpc_mkpipe_dentry(dir, "blocklayout", NULL, pipe); |
| dput(dir); |
| return dentry; |
| } |
| |
| static void nfs4blocklayout_unregister_sb(struct super_block *sb, |
| struct rpc_pipe *pipe) |
| { |
| if (pipe->dentry) |
| rpc_unlink(pipe->dentry); |
| } |
| |
| static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, |
| void *ptr) |
| { |
| struct super_block *sb = ptr; |
| struct net *net = sb->s_fs_info; |
| struct nfs_net *nn = net_generic(net, nfs_net_id); |
| struct dentry *dentry; |
| int ret = 0; |
| |
| if (!try_module_get(THIS_MODULE)) |
| return 0; |
| |
| if (nn->bl_device_pipe == NULL) { |
| module_put(THIS_MODULE); |
| return 0; |
| } |
| |
| switch (event) { |
| case RPC_PIPEFS_MOUNT: |
| dentry = nfs4blocklayout_register_sb(sb, nn->bl_device_pipe); |
| if (IS_ERR(dentry)) { |
| ret = PTR_ERR(dentry); |
| break; |
| } |
| nn->bl_device_pipe->dentry = dentry; |
| break; |
| case RPC_PIPEFS_UMOUNT: |
| if (nn->bl_device_pipe->dentry) |
| nfs4blocklayout_unregister_sb(sb, nn->bl_device_pipe); |
| break; |
| default: |
| ret = -ENOTSUPP; |
| break; |
| } |
| module_put(THIS_MODULE); |
| return ret; |
| } |
| |
| static struct notifier_block nfs4blocklayout_block = { |
| .notifier_call = rpc_pipefs_event, |
| }; |
| |
| static struct dentry *nfs4blocklayout_register_net(struct net *net, |
| struct rpc_pipe *pipe) |
| { |
| struct super_block *pipefs_sb; |
| struct dentry *dentry; |
| |
| pipefs_sb = rpc_get_sb_net(net); |
| if (!pipefs_sb) |
| return NULL; |
| dentry = nfs4blocklayout_register_sb(pipefs_sb, pipe); |
| rpc_put_sb_net(net); |
| return dentry; |
| } |
| |
| static void nfs4blocklayout_unregister_net(struct net *net, |
| struct rpc_pipe *pipe) |
| { |
| struct super_block *pipefs_sb; |
| |
| pipefs_sb = rpc_get_sb_net(net); |
| if (pipefs_sb) { |
| nfs4blocklayout_unregister_sb(pipefs_sb, pipe); |
| rpc_put_sb_net(net); |
| } |
| } |
| |
| static int nfs4blocklayout_net_init(struct net *net) |
| { |
| struct nfs_net *nn = net_generic(net, nfs_net_id); |
| struct dentry *dentry; |
| |
| init_waitqueue_head(&nn->bl_wq); |
| nn->bl_device_pipe = rpc_mkpipe_data(&bl_upcall_ops, 0); |
| if (IS_ERR(nn->bl_device_pipe)) |
| return PTR_ERR(nn->bl_device_pipe); |
| dentry = nfs4blocklayout_register_net(net, nn->bl_device_pipe); |
| if (IS_ERR(dentry)) { |
| rpc_destroy_pipe_data(nn->bl_device_pipe); |
| return PTR_ERR(dentry); |
| } |
| nn->bl_device_pipe->dentry = dentry; |
| return 0; |
| } |
| |
| static void nfs4blocklayout_net_exit(struct net *net) |
| { |
| struct nfs_net *nn = net_generic(net, nfs_net_id); |
| |
| nfs4blocklayout_unregister_net(net, nn->bl_device_pipe); |
| rpc_destroy_pipe_data(nn->bl_device_pipe); |
| nn->bl_device_pipe = NULL; |
| } |
| |
| static struct pernet_operations nfs4blocklayout_net_ops = { |
| .init = nfs4blocklayout_net_init, |
| .exit = nfs4blocklayout_net_exit, |
| }; |
| |
| static int __init nfs4blocklayout_init(void) |
| { |
| int ret; |
| |
| dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__); |
| |
| ret = pnfs_register_layoutdriver(&blocklayout_type); |
| if (ret) |
| goto out; |
| |
| ret = rpc_pipefs_notifier_register(&nfs4blocklayout_block); |
| if (ret) |
| goto out_remove; |
| ret = register_pernet_subsys(&nfs4blocklayout_net_ops); |
| if (ret) |
| goto out_notifier; |
| out: |
| return ret; |
| |
| out_notifier: |
| rpc_pipefs_notifier_unregister(&nfs4blocklayout_block); |
| out_remove: |
| pnfs_unregister_layoutdriver(&blocklayout_type); |
| return ret; |
| } |
| |
| static void __exit nfs4blocklayout_exit(void) |
| { |
| dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n", |
| __func__); |
| |
| rpc_pipefs_notifier_unregister(&nfs4blocklayout_block); |
| unregister_pernet_subsys(&nfs4blocklayout_net_ops); |
| pnfs_unregister_layoutdriver(&blocklayout_type); |
| } |
| |
| MODULE_ALIAS("nfs-layouttype4-3"); |
| |
| module_init(nfs4blocklayout_init); |
| module_exit(nfs4blocklayout_exit); |