| /* |
| * linux/fs/nfs/blocklayout/blocklayout.c |
| * |
| * Module for the NFSv4.1 pNFS block layout driver. |
| * |
| * Copyright (c) 2006 The Regents of the University of Michigan. |
| * All rights reserved. |
| * |
| * Andy Adamson <andros@citi.umich.edu> |
| * Fred Isaman <iisaman@umich.edu> |
| * |
| * permission is granted to use, copy, create derivative works and |
| * redistribute this software and such derivative works for any purpose, |
| * so long as the name of the university of michigan is not used in |
| * any advertising or publicity pertaining to the use or distribution |
| * of this software without specific, written prior authorization. if |
| * the above copyright notice or any other identification of the |
| * university of michigan is included in any copy of any portion of |
| * this software, then the disclaimer below must also be included. |
| * |
| * this software is provided as is, without representation from the |
| * university of michigan as to its fitness for any purpose, and without |
| * warranty by the university of michigan of any kind, either express |
| * or implied, including without limitation the implied warranties of |
| * merchantability and fitness for a particular purpose. the regents |
| * of the university of michigan shall not be liable for any damages, |
| * including special, indirect, incidental, or consequential damages, |
| * with respect to any claim arising out or in connection with the use |
| * of the software, even if it has been or is hereafter advised of the |
| * possibility of such damages. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/mount.h> |
| #include <linux/namei.h> |
| #include <linux/bio.h> /* struct bio */ |
| #include <linux/prefetch.h> |
| #include <linux/pagevec.h> |
| |
| #include "../pnfs.h" |
| #include "../nfs4session.h" |
| #include "../internal.h" |
| #include "blocklayout.h" |
| |
| #define NFSDBG_FACILITY NFSDBG_PNFS_LD |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Andy Adamson <andros@citi.umich.edu>"); |
| MODULE_DESCRIPTION("The NFSv4.1 pNFS Block layout driver"); |
| |
| static bool is_hole(struct pnfs_block_extent *be) |
| { |
| switch (be->be_state) { |
| case PNFS_BLOCK_NONE_DATA: |
| return true; |
| case PNFS_BLOCK_INVALID_DATA: |
| return be->be_tag ? false : true; |
| default: |
| return false; |
| } |
| } |
| |
| /* The data we are handed might be spread across several bios. We need |
| * to track when the last one is finished. |
| */ |
| struct parallel_io { |
| struct kref refcnt; |
| void (*pnfs_callback) (void *data); |
| void *data; |
| }; |
| |
| static inline struct parallel_io *alloc_parallel(void *data) |
| { |
| struct parallel_io *rv; |
| |
| rv = kmalloc(sizeof(*rv), GFP_NOFS); |
| if (rv) { |
| rv->data = data; |
| kref_init(&rv->refcnt); |
| } |
| return rv; |
| } |
| |
| static inline void get_parallel(struct parallel_io *p) |
| { |
| kref_get(&p->refcnt); |
| } |
| |
| static void destroy_parallel(struct kref *kref) |
| { |
| struct parallel_io *p = container_of(kref, struct parallel_io, refcnt); |
| |
| dprintk("%s enter\n", __func__); |
| p->pnfs_callback(p->data); |
| kfree(p); |
| } |
| |
| static inline void put_parallel(struct parallel_io *p) |
| { |
| kref_put(&p->refcnt, destroy_parallel); |
| } |
| |
| static struct bio * |
| bl_submit_bio(struct bio *bio) |
| { |
| if (bio) { |
| get_parallel(bio->bi_private); |
| dprintk("%s submitting %s bio %u@%llu\n", __func__, |
| bio->bi_rw == READ ? "read" : "write", |
| bio->bi_iter.bi_size, |
| (unsigned long long)bio->bi_iter.bi_sector); |
| submit_bio(bio); |
| } |
| return NULL; |
| } |
| |
| static struct bio * |
| bl_alloc_init_bio(int npg, struct block_device *bdev, sector_t disk_sector, |
| bio_end_io_t end_io, struct parallel_io *par) |
| { |
| struct bio *bio; |
| |
| npg = min(npg, BIO_MAX_PAGES); |
| bio = bio_alloc(GFP_NOIO, npg); |
| if (!bio && (current->flags & PF_MEMALLOC)) { |
| while (!bio && (npg /= 2)) |
| bio = bio_alloc(GFP_NOIO, npg); |
| } |
| |
| if (bio) { |
| bio->bi_iter.bi_sector = disk_sector; |
| bio->bi_bdev = bdev; |
| 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_dev_map *map, |
| struct pnfs_block_extent *be, bio_end_io_t end_io, |
| struct parallel_io *par, unsigned int offset, int *len) |
| { |
| struct pnfs_block_dev *dev = |
| container_of(be->be_device, struct pnfs_block_dev, node); |
| u64 disk_addr, end; |
| |
| dprintk("%s: npg %d rw %d isect %llu offset %u len %d\n", __func__, |
| npg, rw, (unsigned long long)isect, offset, *len); |
| |
| /* translate to device offset */ |
| isect += be->be_v_offset; |
| isect -= be->be_f_offset; |
| |
| /* translate to physical disk offset */ |
| disk_addr = (u64)isect << SECTOR_SHIFT; |
| if (disk_addr < map->start || disk_addr >= map->start + map->len) { |
| if (!dev->map(dev, disk_addr, map)) |
| return ERR_PTR(-EIO); |
| bio = bl_submit_bio(bio); |
| } |
| disk_addr += map->disk_offset; |
| disk_addr -= map->start; |
| |
| /* limit length to what the device mapping allows */ |
| end = disk_addr + *len; |
| if (end >= map->start + map->len) |
| *len = map->start + map->len - disk_addr; |
| |
| retry: |
| if (!bio) { |
| bio = bl_alloc_init_bio(npg, map->bdev, |
| disk_addr >> SECTOR_SHIFT, end_io, par); |
| if (!bio) |
| return ERR_PTR(-ENOMEM); |
| bio->bi_rw = rw; |
| } |
| if (bio_add_page(bio, page, *len, offset) < *len) { |
| bio = bl_submit_bio(bio); |
| goto retry; |
| } |
| return bio; |
| } |
| |
| static void bl_end_io_read(struct bio *bio) |
| { |
| struct parallel_io *par = bio->bi_private; |
| |
| if (bio->bi_error) { |
| struct nfs_pgio_header *header = par->data; |
| |
| 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_pgio_header *hdr; |
| dprintk("%s enter\n", __func__); |
| task = container_of(work, struct rpc_task, u.tk_work); |
| hdr = container_of(task, struct nfs_pgio_header, task); |
| pnfs_ld_read_done(hdr); |
| } |
| |
| static void |
| bl_end_par_io_read(void *data) |
| { |
| struct nfs_pgio_header *hdr = data; |
| |
| hdr->task.tk_status = hdr->pnfs_error; |
| INIT_WORK(&hdr->task.u.tk_work, bl_read_cleanup); |
| schedule_work(&hdr->task.u.tk_work); |
| } |
| |
| static enum pnfs_try_status |
| bl_read_pagelist(struct nfs_pgio_header *header) |
| { |
| struct pnfs_block_layout *bl = BLK_LSEG2EXT(header->lseg); |
| struct pnfs_block_dev_map map = { .start = NFS4_MAX_UINT64 }; |
| struct bio *bio = NULL; |
| struct pnfs_block_extent be; |
| sector_t isect, extent_length = 0; |
| struct parallel_io *par; |
| loff_t f_offset = header->args.offset; |
| size_t bytes_left = header->args.count; |
| unsigned int pg_offset = header->args.pgbase, pg_len; |
| struct page **pages = header->args.pages; |
| int pg_index = header->args.pgbase >> PAGE_SHIFT; |
| const bool is_dio = (header->dreq != NULL); |
| struct blk_plug plug; |
| int i; |
| |
| dprintk("%s enter nr_pages %u offset %lld count %u\n", __func__, |
| header->page_array.npages, f_offset, |
| (unsigned int)header->args.count); |
| |
| par = alloc_parallel(header); |
| if (!par) |
| return PNFS_NOT_ATTEMPTED; |
| par->pnfs_callback = bl_end_par_io_read; |
| |
| blk_start_plug(&plug); |
| |
| isect = (sector_t) (f_offset >> SECTOR_SHIFT); |
| /* Code assumes extents are page-aligned */ |
| for (i = pg_index; i < header->page_array.npages; i++) { |
| if (extent_length <= 0) { |
| /* We've used up the previous extent */ |
| bio = bl_submit_bio(bio); |
| |
| /* Get the next one */ |
| if (!ext_tree_lookup(bl, isect, &be, false)) { |
| header->pnfs_error = -EIO; |
| goto out; |
| } |
| extent_length = be.be_length - (isect - be.be_f_offset); |
| } |
| |
| if (is_dio) { |
| if (pg_offset + bytes_left > PAGE_SIZE) |
| pg_len = PAGE_SIZE - pg_offset; |
| else |
| pg_len = bytes_left; |
| } else { |
| BUG_ON(pg_offset != 0); |
| pg_len = PAGE_SIZE; |
| } |
| |
| if (is_hole(&be)) { |
| bio = bl_submit_bio(bio); |
| /* Fill hole w/ zeroes w/o accessing device */ |
| dprintk("%s Zeroing page for hole\n", __func__); |
| zero_user_segment(pages[i], pg_offset, pg_len); |
| |
| /* invalidate map */ |
| map.start = NFS4_MAX_UINT64; |
| } else { |
| bio = do_add_page_to_bio(bio, |
| header->page_array.npages - i, |
| READ, |
| isect, pages[i], &map, &be, |
| bl_end_io_read, par, |
| pg_offset, &pg_len); |
| if (IS_ERR(bio)) { |
| header->pnfs_error = PTR_ERR(bio); |
| bio = NULL; |
| goto out; |
| } |
| } |
| isect += (pg_len >> SECTOR_SHIFT); |
| extent_length -= (pg_len >> SECTOR_SHIFT); |
| f_offset += pg_len; |
| bytes_left -= pg_len; |
| pg_offset = 0; |
| } |
| if ((isect << SECTOR_SHIFT) >= header->inode->i_size) { |
| header->res.eof = 1; |
| header->res.count = header->inode->i_size - header->args.offset; |
| } else { |
| header->res.count = (isect << SECTOR_SHIFT) - header->args.offset; |
| } |
| out: |
| bl_submit_bio(bio); |
| blk_finish_plug(&plug); |
| put_parallel(par); |
| return PNFS_ATTEMPTED; |
| } |
| |
| static void bl_end_io_write(struct bio *bio) |
| { |
| struct parallel_io *par = bio->bi_private; |
| struct nfs_pgio_header *header = par->data; |
| |
| if (bio->bi_error) { |
| 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 = container_of(work, struct rpc_task, u.tk_work); |
| struct nfs_pgio_header *hdr = |
| container_of(task, struct nfs_pgio_header, task); |
| |
| dprintk("%s enter\n", __func__); |
| |
| if (likely(!hdr->pnfs_error)) { |
| struct pnfs_block_layout *bl = BLK_LSEG2EXT(hdr->lseg); |
| u64 start = hdr->args.offset & (loff_t)PAGE_MASK; |
| u64 end = (hdr->args.offset + hdr->args.count + |
| PAGE_SIZE - 1) & (loff_t)PAGE_MASK; |
| |
| ext_tree_mark_written(bl, start >> SECTOR_SHIFT, |
| (end - start) >> SECTOR_SHIFT); |
| } |
| |
| pnfs_ld_write_done(hdr); |
| } |
| |
| /* Called when last of bios associated with a bl_write_pagelist call finishes */ |
| static void bl_end_par_io_write(void *data) |
| { |
| struct nfs_pgio_header *hdr = data; |
| |
| hdr->task.tk_status = hdr->pnfs_error; |
| hdr->verf.committed = NFS_FILE_SYNC; |
| INIT_WORK(&hdr->task.u.tk_work, bl_write_cleanup); |
| schedule_work(&hdr->task.u.tk_work); |
| } |
| |
| static enum pnfs_try_status |
| bl_write_pagelist(struct nfs_pgio_header *header, int sync) |
| { |
| struct pnfs_block_layout *bl = BLK_LSEG2EXT(header->lseg); |
| struct pnfs_block_dev_map map = { .start = NFS4_MAX_UINT64 }; |
| struct bio *bio = NULL; |
| struct pnfs_block_extent be; |
| sector_t isect, extent_length = 0; |
| struct parallel_io *par = NULL; |
| loff_t offset = header->args.offset; |
| size_t count = header->args.count; |
| struct page **pages = header->args.pages; |
| int pg_index = header->args.pgbase >> PAGE_SHIFT; |
| unsigned int pg_len; |
| struct blk_plug plug; |
| int i; |
| |
| dprintk("%s enter, %Zu@%lld\n", __func__, count, offset); |
| |
| /* At this point, header->page_aray is a (sequential) list of nfs_pages. |
| * We want to write each, and if there is an error set pnfs_error |
| * to have it redone using nfs. |
| */ |
| par = alloc_parallel(header); |
| if (!par) |
| return PNFS_NOT_ATTEMPTED; |
| par->pnfs_callback = bl_end_par_io_write; |
| |
| blk_start_plug(&plug); |
| |
| /* we always write out the whole page */ |
| offset = offset & (loff_t)PAGE_MASK; |
| isect = offset >> SECTOR_SHIFT; |
| |
| for (i = pg_index; i < header->page_array.npages; i++) { |
| if (extent_length <= 0) { |
| /* We've used up the previous extent */ |
| bio = bl_submit_bio(bio); |
| /* Get the next one */ |
| if (!ext_tree_lookup(bl, isect, &be, true)) { |
| header->pnfs_error = -EINVAL; |
| goto out; |
| } |
| |
| extent_length = be.be_length - (isect - be.be_f_offset); |
| } |
| |
| pg_len = PAGE_SIZE; |
| bio = do_add_page_to_bio(bio, header->page_array.npages - i, |
| WRITE, isect, pages[i], &map, &be, |
| bl_end_io_write, par, |
| 0, &pg_len); |
| if (IS_ERR(bio)) { |
| header->pnfs_error = PTR_ERR(bio); |
| bio = NULL; |
| goto out; |
| } |
| |
| offset += pg_len; |
| count -= pg_len; |
| isect += (pg_len >> SECTOR_SHIFT); |
| extent_length -= (pg_len >> SECTOR_SHIFT); |
| } |
| |
| header->res.count = header->args.count; |
| out: |
| bl_submit_bio(bio); |
| blk_finish_plug(&plug); |
| put_parallel(par); |
| return PNFS_ATTEMPTED; |
| } |
| |
| static void bl_free_layout_hdr(struct pnfs_layout_hdr *lo) |
| { |
| struct pnfs_block_layout *bl = BLK_LO2EXT(lo); |
| int err; |
| |
| dprintk("%s enter\n", __func__); |
| |
| err = ext_tree_remove(bl, true, 0, LLONG_MAX); |
| WARN_ON(err); |
| |
| kfree(bl); |
| } |
| |
| static struct pnfs_layout_hdr *__bl_alloc_layout_hdr(struct inode *inode, |
| gfp_t gfp_flags, bool is_scsi_layout) |
| { |
| struct pnfs_block_layout *bl; |
| |
| dprintk("%s enter\n", __func__); |
| bl = kzalloc(sizeof(*bl), gfp_flags); |
| if (!bl) |
| return NULL; |
| |
| bl->bl_ext_rw = RB_ROOT; |
| bl->bl_ext_ro = RB_ROOT; |
| spin_lock_init(&bl->bl_ext_lock); |
| |
| bl->bl_scsi_layout = is_scsi_layout; |
| return &bl->bl_layout; |
| } |
| |
| static struct pnfs_layout_hdr *bl_alloc_layout_hdr(struct inode *inode, |
| gfp_t gfp_flags) |
| { |
| return __bl_alloc_layout_hdr(inode, gfp_flags, false); |
| } |
| |
| static struct pnfs_layout_hdr *sl_alloc_layout_hdr(struct inode *inode, |
| gfp_t gfp_flags) |
| { |
| return __bl_alloc_layout_hdr(inode, gfp_flags, true); |
| } |
| |
| static void bl_free_lseg(struct pnfs_layout_segment *lseg) |
| { |
| dprintk("%s enter\n", __func__); |
| kfree(lseg); |
| } |
| |
| /* Tracks info needed to ensure extents in layout obey constraints of spec */ |
| struct layout_verification { |
| u32 mode; /* R or RW */ |
| u64 start; /* Expected start of next non-COW extent */ |
| u64 inval; /* Start of INVAL coverage */ |
| u64 cowread; /* End of COW read coverage */ |
| }; |
| |
| /* Verify the extent meets the layout requirements of the pnfs-block draft, |
| * section 2.3.1. |
| */ |
| static int verify_extent(struct pnfs_block_extent *be, |
| struct layout_verification *lv) |
| { |
| if (lv->mode == IOMODE_READ) { |
| if (be->be_state == PNFS_BLOCK_READWRITE_DATA || |
| be->be_state == PNFS_BLOCK_INVALID_DATA) |
| return -EIO; |
| if (be->be_f_offset != lv->start) |
| return -EIO; |
| lv->start += be->be_length; |
| return 0; |
| } |
| /* lv->mode == IOMODE_RW */ |
| if (be->be_state == PNFS_BLOCK_READWRITE_DATA) { |
| if (be->be_f_offset != lv->start) |
| return -EIO; |
| if (lv->cowread > lv->start) |
| return -EIO; |
| lv->start += be->be_length; |
| lv->inval = lv->start; |
| return 0; |
| } else if (be->be_state == PNFS_BLOCK_INVALID_DATA) { |
| if (be->be_f_offset != lv->start) |
| return -EIO; |
| lv->start += be->be_length; |
| return 0; |
| } else if (be->be_state == PNFS_BLOCK_READ_DATA) { |
| if (be->be_f_offset > lv->start) |
| return -EIO; |
| if (be->be_f_offset < lv->inval) |
| return -EIO; |
| if (be->be_f_offset < lv->cowread) |
| return -EIO; |
| /* It looks like you might want to min this with lv->start, |
| * but you really don't. |
| */ |
| lv->inval = lv->inval + be->be_length; |
| lv->cowread = be->be_f_offset + be->be_length; |
| return 0; |
| } else |
| return -EIO; |
| } |
| |
| static int decode_sector_number(__be32 **rp, sector_t *sp) |
| { |
| uint64_t s; |
| |
| *rp = xdr_decode_hyper(*rp, &s); |
| if (s & 0x1ff) { |
| printk(KERN_WARNING "NFS: %s: sector not aligned\n", __func__); |
| return -1; |
| } |
| *sp = s >> SECTOR_SHIFT; |
| return 0; |
| } |
| |
| static int |
| bl_alloc_extent(struct xdr_stream *xdr, struct pnfs_layout_hdr *lo, |
| struct layout_verification *lv, struct list_head *extents, |
| gfp_t gfp_mask) |
| { |
| struct pnfs_block_extent *be; |
| struct nfs4_deviceid id; |
| int error; |
| __be32 *p; |
| |
| p = xdr_inline_decode(xdr, 28 + NFS4_DEVICEID4_SIZE); |
| if (!p) |
| return -EIO; |
| |
| be = kzalloc(sizeof(*be), GFP_NOFS); |
| if (!be) |
| return -ENOMEM; |
| |
| memcpy(&id, p, NFS4_DEVICEID4_SIZE); |
| p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); |
| |
| error = -EIO; |
| be->be_device = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode), &id, |
| lo->plh_lc_cred, gfp_mask); |
| if (!be->be_device) |
| goto out_free_be; |
| |
| /* |
| * The next three values are read in as bytes, but stored in the |
| * extent structure in 512-byte granularity. |
| */ |
| if (decode_sector_number(&p, &be->be_f_offset) < 0) |
| goto out_put_deviceid; |
| if (decode_sector_number(&p, &be->be_length) < 0) |
| goto out_put_deviceid; |
| if (decode_sector_number(&p, &be->be_v_offset) < 0) |
| goto out_put_deviceid; |
| be->be_state = be32_to_cpup(p++); |
| |
| error = verify_extent(be, lv); |
| if (error) { |
| dprintk("%s: extent verification failed\n", __func__); |
| goto out_put_deviceid; |
| } |
| |
| list_add_tail(&be->be_list, extents); |
| return 0; |
| |
| out_put_deviceid: |
| nfs4_put_deviceid_node(be->be_device); |
| out_free_be: |
| kfree(be); |
| return error; |
| } |
| |
| static struct pnfs_layout_segment * |
| bl_alloc_lseg(struct pnfs_layout_hdr *lo, struct nfs4_layoutget_res *lgr, |
| gfp_t gfp_mask) |
| { |
| struct layout_verification lv = { |
| .mode = lgr->range.iomode, |
| .start = lgr->range.offset >> SECTOR_SHIFT, |
| .inval = lgr->range.offset >> SECTOR_SHIFT, |
| .cowread = lgr->range.offset >> SECTOR_SHIFT, |
| }; |
| struct pnfs_block_layout *bl = BLK_LO2EXT(lo); |
| struct pnfs_layout_segment *lseg; |
| struct xdr_buf buf; |
| struct xdr_stream xdr; |
| struct page *scratch; |
| int status, i; |
| uint32_t count; |
| __be32 *p; |
| LIST_HEAD(extents); |
| |
| dprintk("---> %s\n", __func__); |
| |
| lseg = kzalloc(sizeof(*lseg), gfp_mask); |
| if (!lseg) |
| return ERR_PTR(-ENOMEM); |
| |
| status = -ENOMEM; |
| scratch = alloc_page(gfp_mask); |
| if (!scratch) |
| goto out; |
| |
| xdr_init_decode_pages(&xdr, &buf, |
| lgr->layoutp->pages, lgr->layoutp->len); |
| xdr_set_scratch_buffer(&xdr, page_address(scratch), PAGE_SIZE); |
| |
| status = -EIO; |
| p = xdr_inline_decode(&xdr, 4); |
| if (unlikely(!p)) |
| goto out_free_scratch; |
| |
| count = be32_to_cpup(p++); |
| dprintk("%s: number of extents %d\n", __func__, count); |
| |
| /* |
| * Decode individual extents, putting them in temporary staging area |
| * until whole layout is decoded to make error recovery easier. |
| */ |
| for (i = 0; i < count; i++) { |
| status = bl_alloc_extent(&xdr, lo, &lv, &extents, gfp_mask); |
| if (status) |
| goto process_extents; |
| } |
| |
| if (lgr->range.offset + lgr->range.length != |
| lv.start << SECTOR_SHIFT) { |
| dprintk("%s Final length mismatch\n", __func__); |
| status = -EIO; |
| goto process_extents; |
| } |
| |
| if (lv.start < lv.cowread) { |
| dprintk("%s Final uncovered COW extent\n", __func__); |
| status = -EIO; |
| } |
| |
| process_extents: |
| while (!list_empty(&extents)) { |
| struct pnfs_block_extent *be = |
| list_first_entry(&extents, struct pnfs_block_extent, |
| be_list); |
| list_del(&be->be_list); |
| |
| if (!status) |
| status = ext_tree_insert(bl, be); |
| |
| if (status) { |
| nfs4_put_deviceid_node(be->be_device); |
| kfree(be); |
| } |
| } |
| |
| out_free_scratch: |
| __free_page(scratch); |
| out: |
| dprintk("%s returns %d\n", __func__, status); |
| if (status) { |
| kfree(lseg); |
| return ERR_PTR(status); |
| } |
| return lseg; |
| } |
| |
| static void |
| bl_return_range(struct pnfs_layout_hdr *lo, |
| struct pnfs_layout_range *range) |
| { |
| struct pnfs_block_layout *bl = BLK_LO2EXT(lo); |
| sector_t offset = range->offset >> SECTOR_SHIFT, end; |
| |
| if (range->offset % 8) { |
| dprintk("%s: offset %lld not block size aligned\n", |
| __func__, range->offset); |
| return; |
| } |
| |
| if (range->length != NFS4_MAX_UINT64) { |
| if (range->length % 8) { |
| dprintk("%s: length %lld not block size aligned\n", |
| __func__, range->length); |
| return; |
| } |
| |
| end = offset + (range->length >> SECTOR_SHIFT); |
| } else { |
| end = round_down(NFS4_MAX_UINT64, PAGE_SIZE); |
| } |
| |
| ext_tree_remove(bl, range->iomode & IOMODE_RW, offset, end); |
| } |
| |
| static int |
| bl_prepare_layoutcommit(struct nfs4_layoutcommit_args *arg) |
| { |
| return ext_tree_prepare_commit(arg); |
| } |
| |
| static void |
| bl_cleanup_layoutcommit(struct nfs4_layoutcommit_data *lcdata) |
| { |
| ext_tree_mark_committed(&lcdata->args, lcdata->res.status); |
| } |
| |
| static int |
| bl_set_layoutdriver(struct nfs_server *server, const struct nfs_fh *fh) |
| { |
| dprintk("%s enter\n", __func__); |
| |
| if (server->pnfs_blksize == 0) { |
| dprintk("%s Server did not return blksize\n", __func__); |
| return -EINVAL; |
| } |
| if (server->pnfs_blksize > PAGE_SIZE) { |
| printk(KERN_ERR "%s: pNFS blksize %d not supported.\n", |
| __func__, server->pnfs_blksize); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static bool |
| is_aligned_req(struct nfs_pageio_descriptor *pgio, |
| struct nfs_page *req, unsigned int alignment, bool is_write) |
| { |
| /* |
| * Always accept buffered writes, higher layers take care of the |
| * right alignment. |
| */ |
| if (pgio->pg_dreq == NULL) |
| return true; |
| |
| if (!IS_ALIGNED(req->wb_offset, alignment)) |
| return false; |
| |
| if (IS_ALIGNED(req->wb_bytes, alignment)) |
| return true; |
| |
| if (is_write && |
| (req_offset(req) + req->wb_bytes == i_size_read(pgio->pg_inode))) { |
| /* |
| * If the write goes up to the inode size, just write |
| * the full page. Data past the inode size is |
| * guaranteed to be zeroed by the higher level client |
| * code, and this behaviour is mandated by RFC 5663 |
| * section 2.3.2. |
| */ |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static void |
| bl_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) |
| { |
| if (!is_aligned_req(pgio, req, SECTOR_SIZE, false)) { |
| nfs_pageio_reset_read_mds(pgio); |
| return; |
| } |
| |
| pnfs_generic_pg_init_read(pgio, req); |
| } |
| |
| /* |
| * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number |
| * of bytes (maximum @req->wb_bytes) that can be coalesced. |
| */ |
| static size_t |
| bl_pg_test_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, |
| struct nfs_page *req) |
| { |
| if (!is_aligned_req(pgio, req, SECTOR_SIZE, false)) |
| return 0; |
| return pnfs_generic_pg_test(pgio, prev, req); |
| } |
| |
| /* |
| * Return the number of contiguous bytes for a given inode |
| * starting at page frame idx. |
| */ |
| static u64 pnfs_num_cont_bytes(struct inode *inode, pgoff_t idx) |
| { |
| struct address_space *mapping = inode->i_mapping; |
| pgoff_t end; |
| |
| /* Optimize common case that writes from 0 to end of file */ |
| end = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE); |
| if (end != inode->i_mapping->nrpages) { |
| rcu_read_lock(); |
| end = page_cache_next_hole(mapping, idx + 1, ULONG_MAX); |
| rcu_read_unlock(); |
| } |
| |
| if (!end) |
| return i_size_read(inode) - (idx << PAGE_SHIFT); |
| else |
| return (end - idx) << PAGE_SHIFT; |
| } |
| |
| static void |
| bl_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) |
| { |
| u64 wb_size; |
| |
| if (!is_aligned_req(pgio, req, PAGE_SIZE, true)) { |
| nfs_pageio_reset_write_mds(pgio); |
| return; |
| } |
| |
| if (pgio->pg_dreq == NULL) |
| wb_size = pnfs_num_cont_bytes(pgio->pg_inode, |
| req->wb_index); |
| else |
| wb_size = nfs_dreq_bytes_left(pgio->pg_dreq); |
| |
| pnfs_generic_pg_init_write(pgio, req, wb_size); |
| } |
| |
| /* |
| * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number |
| * of bytes (maximum @req->wb_bytes) that can be coalesced. |
| */ |
| static size_t |
| bl_pg_test_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, |
| struct nfs_page *req) |
| { |
| if (!is_aligned_req(pgio, req, PAGE_SIZE, true)) |
| return 0; |
| return pnfs_generic_pg_test(pgio, prev, req); |
| } |
| |
| static const struct nfs_pageio_ops bl_pg_read_ops = { |
| .pg_init = bl_pg_init_read, |
| .pg_test = bl_pg_test_read, |
| .pg_doio = pnfs_generic_pg_readpages, |
| .pg_cleanup = pnfs_generic_pg_cleanup, |
| }; |
| |
| static const struct nfs_pageio_ops bl_pg_write_ops = { |
| .pg_init = bl_pg_init_write, |
| .pg_test = bl_pg_test_write, |
| .pg_doio = pnfs_generic_pg_writepages, |
| .pg_cleanup = pnfs_generic_pg_cleanup, |
| }; |
| |
| static struct pnfs_layoutdriver_type blocklayout_type = { |
| .id = LAYOUT_BLOCK_VOLUME, |
| .name = "LAYOUT_BLOCK_VOLUME", |
| .owner = THIS_MODULE, |
| .flags = PNFS_LAYOUTRET_ON_SETATTR | |
| PNFS_READ_WHOLE_PAGE, |
| .read_pagelist = bl_read_pagelist, |
| .write_pagelist = bl_write_pagelist, |
| .alloc_layout_hdr = bl_alloc_layout_hdr, |
| .free_layout_hdr = bl_free_layout_hdr, |
| .alloc_lseg = bl_alloc_lseg, |
| .free_lseg = bl_free_lseg, |
| .return_range = bl_return_range, |
| .prepare_layoutcommit = bl_prepare_layoutcommit, |
| .cleanup_layoutcommit = bl_cleanup_layoutcommit, |
| .set_layoutdriver = bl_set_layoutdriver, |
| .alloc_deviceid_node = bl_alloc_deviceid_node, |
| .free_deviceid_node = bl_free_deviceid_node, |
| .pg_read_ops = &bl_pg_read_ops, |
| .pg_write_ops = &bl_pg_write_ops, |
| .sync = pnfs_generic_sync, |
| }; |
| |
| static struct pnfs_layoutdriver_type scsilayout_type = { |
| .id = LAYOUT_SCSI, |
| .name = "LAYOUT_SCSI", |
| .owner = THIS_MODULE, |
| .flags = PNFS_LAYOUTRET_ON_SETATTR | |
| PNFS_READ_WHOLE_PAGE, |
| .read_pagelist = bl_read_pagelist, |
| .write_pagelist = bl_write_pagelist, |
| .alloc_layout_hdr = sl_alloc_layout_hdr, |
| .free_layout_hdr = bl_free_layout_hdr, |
| .alloc_lseg = bl_alloc_lseg, |
| .free_lseg = bl_free_lseg, |
| .return_range = bl_return_range, |
| .prepare_layoutcommit = bl_prepare_layoutcommit, |
| .cleanup_layoutcommit = bl_cleanup_layoutcommit, |
| .set_layoutdriver = bl_set_layoutdriver, |
| .alloc_deviceid_node = bl_alloc_deviceid_node, |
| .free_deviceid_node = bl_free_deviceid_node, |
| .pg_read_ops = &bl_pg_read_ops, |
| .pg_write_ops = &bl_pg_write_ops, |
| .sync = pnfs_generic_sync, |
| }; |
| |
| |
| static int __init nfs4blocklayout_init(void) |
| { |
| int ret; |
| |
| dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__); |
| |
| ret = bl_init_pipefs(); |
| if (ret) |
| goto out; |
| |
| ret = pnfs_register_layoutdriver(&blocklayout_type); |
| if (ret) |
| goto out_cleanup_pipe; |
| |
| ret = pnfs_register_layoutdriver(&scsilayout_type); |
| if (ret) |
| goto out_unregister_block; |
| return 0; |
| |
| out_unregister_block: |
| pnfs_unregister_layoutdriver(&blocklayout_type); |
| out_cleanup_pipe: |
| bl_cleanup_pipefs(); |
| out: |
| return ret; |
| } |
| |
| static void __exit nfs4blocklayout_exit(void) |
| { |
| dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n", |
| __func__); |
| |
| pnfs_unregister_layoutdriver(&scsilayout_type); |
| pnfs_unregister_layoutdriver(&blocklayout_type); |
| bl_cleanup_pipefs(); |
| } |
| |
| MODULE_ALIAS("nfs-layouttype4-3"); |
| |
| module_init(nfs4blocklayout_init); |
| module_exit(nfs4blocklayout_exit); |