diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/nfs/blocklayout/blocklayout.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/nfs/blocklayout/blocklayout.c | 1185 |
1 files changed, 0 insertions, 1185 deletions
diff --git a/ANDROID_3.4.5/fs/nfs/blocklayout/blocklayout.c b/ANDROID_3.4.5/fs/nfs/blocklayout/blocklayout.c deleted file mode 100644 index 7f6a23f0..00000000 --- a/ANDROID_3.4.5/fs/nfs/blocklayout/blocklayout.c +++ /dev/null @@ -1,1185 +0,0 @@ -/* - * 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 "../pnfs.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 *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, int unused) -{ - struct nfs_read_data *rdata = data; - - rdata->task.tk_status = rdata->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) -{ - 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; - struct page **pages = rdata->args.pages; - int pg_index = rdata->args.pgbase >> PAGE_CACHE_SHIFT; - - dprintk("%s enter nr_pages %u offset %lld count %u\n", __func__, - rdata->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->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; - 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; - 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 (unlikely(!uptodate)) { - if (!wdata->pnfs_error) - wdata->pnfs_error = -EIO; - pnfs_set_lo_fail(wdata->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 *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 (likely(!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, int num_se) -{ - struct nfs_write_data *wdata = data; - - if (unlikely(wdata->pnfs_error)) { - bl_free_short_extents(&BLK_LSEG2EXT(wdata->lseg)->bl_inval, - num_se); - } - - wdata->task.tk_status = wdata->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; -} - -/* 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; -} - -/* 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) -{ - 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) - 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(wdata->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(wdata->inode, index, - cow_read); - if (unlikely(IS_ERR(page))) { - wdata->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); - wdata->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); - wdata->pnfs_error = -ENOMEM; - 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); - - 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; - } -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; - } - if (be->be_state == PNFS_BLOCK_INVALID_DATA) { - if (likely(!bl_push_one_short_extent( - be->be_inval))) - par->bse_count++; - else { - wdata->pnfs_error = -ENOMEM; - 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); - 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; -out_mds: - bl_put_extent(be); - 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'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 = 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 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 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); |