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1029 lines
26 KiB
1029 lines
26 KiB
/* |
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* linux/fs/nfs/blocklayout/blocklayout.c |
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* |
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* Module for the NFSv4.1 pNFS block layout driver. |
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* |
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* Copyright (c) 2006 The Regents of the University of Michigan. |
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* All rights reserved. |
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* |
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* Andy Adamson <[email protected]> |
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* Fred Isaman <[email protected]> |
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* |
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* permission is granted to use, copy, create derivative works and |
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* redistribute this software and such derivative works for any purpose, |
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* so long as the name of the university of michigan is not used in |
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* any advertising or publicity pertaining to the use or distribution |
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* of this software without specific, written prior authorization. if |
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* the above copyright notice or any other identification of the |
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* university of michigan is included in any copy of any portion of |
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* this software, then the disclaimer below must also be included. |
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* |
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* this software is provided as is, without representation from the |
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* university of michigan as to its fitness for any purpose, and without |
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* warranty by the university of michigan of any kind, either express |
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* or implied, including without limitation the implied warranties of |
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* merchantability and fitness for a particular purpose. the regents |
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* of the university of michigan shall not be liable for any damages, |
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* including special, indirect, incidental, or consequential damages, |
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* with respect to any claim arising out or in connection with the use |
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* of the software, even if it has been or is hereafter advised of the |
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* possibility of such damages. |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/mount.h> |
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#include <linux/namei.h> |
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#include <linux/bio.h> /* struct bio */ |
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#include <linux/prefetch.h> |
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#include <linux/pagevec.h> |
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|
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#include "../pnfs.h" |
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#include "../nfs4session.h" |
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#include "../internal.h" |
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#include "blocklayout.h" |
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|
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#define NFSDBG_FACILITY NFSDBG_PNFS_LD |
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|
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Andy Adamson <[email protected]>"); |
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MODULE_DESCRIPTION("The NFSv4.1 pNFS Block layout driver"); |
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|
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static bool is_hole(struct pnfs_block_extent *be) |
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{ |
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switch (be->be_state) { |
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case PNFS_BLOCK_NONE_DATA: |
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return true; |
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case PNFS_BLOCK_INVALID_DATA: |
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return be->be_tag ? false : true; |
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default: |
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return false; |
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} |
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} |
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|
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/* The data we are handed might be spread across several bios. We need |
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* to track when the last one is finished. |
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*/ |
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struct parallel_io { |
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struct kref refcnt; |
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void (*pnfs_callback) (void *data); |
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void *data; |
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}; |
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|
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static inline struct parallel_io *alloc_parallel(void *data) |
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{ |
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struct parallel_io *rv; |
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|
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rv = kmalloc(sizeof(*rv), GFP_NOFS); |
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if (rv) { |
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rv->data = data; |
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kref_init(&rv->refcnt); |
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} |
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return rv; |
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} |
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|
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static inline void get_parallel(struct parallel_io *p) |
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{ |
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kref_get(&p->refcnt); |
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} |
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|
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static void destroy_parallel(struct kref *kref) |
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{ |
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struct parallel_io *p = container_of(kref, struct parallel_io, refcnt); |
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|
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dprintk("%s enter\n", __func__); |
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p->pnfs_callback(p->data); |
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kfree(p); |
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} |
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|
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static inline void put_parallel(struct parallel_io *p) |
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{ |
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kref_put(&p->refcnt, destroy_parallel); |
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} |
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|
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static struct bio * |
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bl_submit_bio(struct bio *bio) |
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{ |
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if (bio) { |
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get_parallel(bio->bi_private); |
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dprintk("%s submitting %s bio %u@%llu\n", __func__, |
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bio_op(bio) == READ ? "read" : "write", |
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bio->bi_iter.bi_size, |
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(unsigned long long)bio->bi_iter.bi_sector); |
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submit_bio(bio); |
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} |
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return NULL; |
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} |
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|
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static bool offset_in_map(u64 offset, struct pnfs_block_dev_map *map) |
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{ |
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return offset >= map->start && offset < map->start + map->len; |
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} |
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|
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static struct bio * |
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do_add_page_to_bio(struct bio *bio, int npg, enum req_op op, sector_t isect, |
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struct page *page, struct pnfs_block_dev_map *map, |
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struct pnfs_block_extent *be, bio_end_io_t end_io, |
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struct parallel_io *par, unsigned int offset, int *len) |
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{ |
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struct pnfs_block_dev *dev = |
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container_of(be->be_device, struct pnfs_block_dev, node); |
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u64 disk_addr, end; |
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|
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dprintk("%s: npg %d rw %d isect %llu offset %u len %d\n", __func__, |
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npg, (__force u32)op, (unsigned long long)isect, offset, *len); |
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|
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/* translate to device offset */ |
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isect += be->be_v_offset; |
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isect -= be->be_f_offset; |
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|
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/* translate to physical disk offset */ |
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disk_addr = (u64)isect << SECTOR_SHIFT; |
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if (!offset_in_map(disk_addr, map)) { |
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if (!dev->map(dev, disk_addr, map) || !offset_in_map(disk_addr, map)) |
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return ERR_PTR(-EIO); |
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bio = bl_submit_bio(bio); |
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} |
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disk_addr += map->disk_offset; |
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disk_addr -= map->start; |
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|
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/* limit length to what the device mapping allows */ |
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end = disk_addr + *len; |
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if (end >= map->start + map->len) |
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*len = map->start + map->len - disk_addr; |
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|
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retry: |
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if (!bio) { |
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bio = bio_alloc(map->bdev, bio_max_segs(npg), op, GFP_NOIO); |
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bio->bi_iter.bi_sector = disk_addr >> SECTOR_SHIFT; |
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bio->bi_end_io = end_io; |
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bio->bi_private = par; |
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} |
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if (bio_add_page(bio, page, *len, offset) < *len) { |
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bio = bl_submit_bio(bio); |
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goto retry; |
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} |
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return bio; |
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} |
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|
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static void bl_mark_devices_unavailable(struct nfs_pgio_header *header, bool rw) |
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{ |
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struct pnfs_block_layout *bl = BLK_LSEG2EXT(header->lseg); |
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size_t bytes_left = header->args.count; |
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sector_t isect, extent_length = 0; |
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struct pnfs_block_extent be; |
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|
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isect = header->args.offset >> SECTOR_SHIFT; |
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bytes_left += header->args.offset - (isect << SECTOR_SHIFT); |
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|
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while (bytes_left > 0) { |
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if (!ext_tree_lookup(bl, isect, &be, rw)) |
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return; |
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extent_length = be.be_length - (isect - be.be_f_offset); |
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nfs4_mark_deviceid_unavailable(be.be_device); |
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isect += extent_length; |
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if (bytes_left > extent_length << SECTOR_SHIFT) |
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bytes_left -= extent_length << SECTOR_SHIFT; |
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else |
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bytes_left = 0; |
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} |
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} |
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|
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static void bl_end_io_read(struct bio *bio) |
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{ |
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struct parallel_io *par = bio->bi_private; |
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|
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if (bio->bi_status) { |
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struct nfs_pgio_header *header = par->data; |
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|
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if (!header->pnfs_error) |
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header->pnfs_error = -EIO; |
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pnfs_set_lo_fail(header->lseg); |
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bl_mark_devices_unavailable(header, false); |
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} |
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|
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bio_put(bio); |
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put_parallel(par); |
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} |
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|
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static void bl_read_cleanup(struct work_struct *work) |
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{ |
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struct rpc_task *task; |
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struct nfs_pgio_header *hdr; |
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dprintk("%s enter\n", __func__); |
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task = container_of(work, struct rpc_task, u.tk_work); |
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hdr = container_of(task, struct nfs_pgio_header, task); |
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pnfs_ld_read_done(hdr); |
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} |
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|
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static void |
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bl_end_par_io_read(void *data) |
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{ |
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struct nfs_pgio_header *hdr = data; |
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|
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hdr->task.tk_status = hdr->pnfs_error; |
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INIT_WORK(&hdr->task.u.tk_work, bl_read_cleanup); |
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schedule_work(&hdr->task.u.tk_work); |
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} |
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|
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static enum pnfs_try_status |
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bl_read_pagelist(struct nfs_pgio_header *header) |
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{ |
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struct pnfs_block_layout *bl = BLK_LSEG2EXT(header->lseg); |
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struct pnfs_block_dev_map map = { .start = NFS4_MAX_UINT64 }; |
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struct bio *bio = NULL; |
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struct pnfs_block_extent be; |
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sector_t isect, extent_length = 0; |
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struct parallel_io *par; |
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loff_t f_offset = header->args.offset; |
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size_t bytes_left = header->args.count; |
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unsigned int pg_offset = header->args.pgbase, pg_len; |
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struct page **pages = header->args.pages; |
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int pg_index = header->args.pgbase >> PAGE_SHIFT; |
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const bool is_dio = (header->dreq != NULL); |
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struct blk_plug plug; |
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int i; |
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|
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dprintk("%s enter nr_pages %u offset %lld count %u\n", __func__, |
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header->page_array.npages, f_offset, |
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(unsigned int)header->args.count); |
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|
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par = alloc_parallel(header); |
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if (!par) |
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return PNFS_NOT_ATTEMPTED; |
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par->pnfs_callback = bl_end_par_io_read; |
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|
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blk_start_plug(&plug); |
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|
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isect = (sector_t) (f_offset >> SECTOR_SHIFT); |
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/* Code assumes extents are page-aligned */ |
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for (i = pg_index; i < header->page_array.npages; i++) { |
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if (extent_length <= 0) { |
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/* We've used up the previous extent */ |
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bio = bl_submit_bio(bio); |
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|
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/* Get the next one */ |
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if (!ext_tree_lookup(bl, isect, &be, false)) { |
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header->pnfs_error = -EIO; |
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goto out; |
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} |
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extent_length = be.be_length - (isect - be.be_f_offset); |
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} |
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|
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if (is_dio) { |
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if (pg_offset + bytes_left > PAGE_SIZE) |
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pg_len = PAGE_SIZE - pg_offset; |
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else |
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pg_len = bytes_left; |
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} else { |
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BUG_ON(pg_offset != 0); |
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pg_len = PAGE_SIZE; |
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} |
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|
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if (is_hole(&be)) { |
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bio = bl_submit_bio(bio); |
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/* Fill hole w/ zeroes w/o accessing device */ |
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dprintk("%s Zeroing page for hole\n", __func__); |
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zero_user_segment(pages[i], pg_offset, pg_len); |
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|
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/* invalidate map */ |
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map.start = NFS4_MAX_UINT64; |
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} else { |
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bio = do_add_page_to_bio(bio, |
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header->page_array.npages - i, |
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REQ_OP_READ, |
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isect, pages[i], &map, &be, |
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bl_end_io_read, par, |
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pg_offset, &pg_len); |
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if (IS_ERR(bio)) { |
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header->pnfs_error = PTR_ERR(bio); |
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bio = NULL; |
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goto out; |
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} |
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} |
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isect += (pg_len >> SECTOR_SHIFT); |
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extent_length -= (pg_len >> SECTOR_SHIFT); |
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f_offset += pg_len; |
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bytes_left -= pg_len; |
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pg_offset = 0; |
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} |
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if ((isect << SECTOR_SHIFT) >= header->inode->i_size) { |
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header->res.eof = 1; |
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header->res.count = header->inode->i_size - header->args.offset; |
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} else { |
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header->res.count = (isect << SECTOR_SHIFT) - header->args.offset; |
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} |
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out: |
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bl_submit_bio(bio); |
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blk_finish_plug(&plug); |
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put_parallel(par); |
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return PNFS_ATTEMPTED; |
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} |
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|
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static void bl_end_io_write(struct bio *bio) |
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{ |
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struct parallel_io *par = bio->bi_private; |
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struct nfs_pgio_header *header = par->data; |
|
|
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if (bio->bi_status) { |
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if (!header->pnfs_error) |
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header->pnfs_error = -EIO; |
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pnfs_set_lo_fail(header->lseg); |
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bl_mark_devices_unavailable(header, true); |
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} |
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bio_put(bio); |
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put_parallel(par); |
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} |
|
|
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/* Function scheduled for call during bl_end_par_io_write, |
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* it marks sectors as written and extends the commitlist. |
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*/ |
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static void bl_write_cleanup(struct work_struct *work) |
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{ |
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struct rpc_task *task = container_of(work, struct rpc_task, u.tk_work); |
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struct nfs_pgio_header *hdr = |
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container_of(task, struct nfs_pgio_header, task); |
|
|
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dprintk("%s enter\n", __func__); |
|
|
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if (likely(!hdr->pnfs_error)) { |
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struct pnfs_block_layout *bl = BLK_LSEG2EXT(hdr->lseg); |
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u64 start = hdr->args.offset & (loff_t)PAGE_MASK; |
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u64 end = (hdr->args.offset + hdr->args.count + |
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PAGE_SIZE - 1) & (loff_t)PAGE_MASK; |
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u64 lwb = hdr->args.offset + hdr->args.count; |
|
|
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ext_tree_mark_written(bl, start >> SECTOR_SHIFT, |
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(end - start) >> SECTOR_SHIFT, lwb); |
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} |
|
|
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pnfs_ld_write_done(hdr); |
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} |
|
|
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/* Called when last of bios associated with a bl_write_pagelist call finishes */ |
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static void bl_end_par_io_write(void *data) |
|
{ |
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struct nfs_pgio_header *hdr = data; |
|
|
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hdr->task.tk_status = hdr->pnfs_error; |
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hdr->verf.committed = NFS_FILE_SYNC; |
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INIT_WORK(&hdr->task.u.tk_work, bl_write_cleanup); |
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schedule_work(&hdr->task.u.tk_work); |
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} |
|
|
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static enum pnfs_try_status |
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bl_write_pagelist(struct nfs_pgio_header *header, int sync) |
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{ |
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struct pnfs_block_layout *bl = BLK_LSEG2EXT(header->lseg); |
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struct pnfs_block_dev_map map = { .start = NFS4_MAX_UINT64 }; |
|
struct bio *bio = NULL; |
|
struct pnfs_block_extent be; |
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sector_t isect, extent_length = 0; |
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struct parallel_io *par = NULL; |
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loff_t offset = header->args.offset; |
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size_t count = header->args.count; |
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struct page **pages = header->args.pages; |
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int pg_index = header->args.pgbase >> PAGE_SHIFT; |
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unsigned int pg_len; |
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struct blk_plug plug; |
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int i; |
|
|
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dprintk("%s enter, %zu@%lld\n", __func__, count, offset); |
|
|
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/* At this point, header->page_aray is a (sequential) list of nfs_pages. |
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* We want to write each, and if there is an error set pnfs_error |
|
* to have it redone using nfs. |
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*/ |
|
par = alloc_parallel(header); |
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if (!par) |
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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++) { |
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if (extent_length <= 0) { |
|
/* We've used up the previous extent */ |
|
bio = bl_submit_bio(bio); |
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/* 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, |
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REQ_OP_WRITE, isect, pages[i], &map, |
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&be, bl_end_io_write, par, 0, &pg_len); |
|
if (IS_ERR(bio)) { |
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header->pnfs_error = PTR_ERR(bio); |
|
bio = NULL; |
|
goto out; |
|
} |
|
|
|
offset += pg_len; |
|
count -= pg_len; |
|
isect += (pg_len >> SECTOR_SHIFT); |
|
extent_length -= (pg_len >> SECTOR_SHIFT); |
|
} |
|
|
|
header->res.count = header->args.count; |
|
out: |
|
bl_submit_bio(bio); |
|
blk_finish_plug(&plug); |
|
put_parallel(par); |
|
return PNFS_ATTEMPTED; |
|
} |
|
|
|
static void bl_free_layout_hdr(struct pnfs_layout_hdr *lo) |
|
{ |
|
struct pnfs_block_layout *bl = BLK_LO2EXT(lo); |
|
int err; |
|
|
|
dprintk("%s enter\n", __func__); |
|
|
|
err = ext_tree_remove(bl, true, 0, LLONG_MAX); |
|
WARN_ON(err); |
|
|
|
kfree_rcu(bl, bl_layout.plh_rcu); |
|
} |
|
|
|
static struct pnfs_layout_hdr *__bl_alloc_layout_hdr(struct inode *inode, |
|
gfp_t gfp_flags, bool is_scsi_layout) |
|
{ |
|
struct pnfs_block_layout *bl; |
|
|
|
dprintk("%s enter\n", __func__); |
|
bl = kzalloc(sizeof(*bl), gfp_flags); |
|
if (!bl) |
|
return NULL; |
|
|
|
bl->bl_ext_rw = RB_ROOT; |
|
bl->bl_ext_ro = RB_ROOT; |
|
spin_lock_init(&bl->bl_ext_lock); |
|
|
|
bl->bl_scsi_layout = is_scsi_layout; |
|
return &bl->bl_layout; |
|
} |
|
|
|
static struct pnfs_layout_hdr *bl_alloc_layout_hdr(struct inode *inode, |
|
gfp_t gfp_flags) |
|
{ |
|
return __bl_alloc_layout_hdr(inode, gfp_flags, false); |
|
} |
|
|
|
static struct pnfs_layout_hdr *sl_alloc_layout_hdr(struct inode *inode, |
|
gfp_t gfp_flags) |
|
{ |
|
return __bl_alloc_layout_hdr(inode, gfp_flags, true); |
|
} |
|
|
|
static void bl_free_lseg(struct pnfs_layout_segment *lseg) |
|
{ |
|
dprintk("%s enter\n", __func__); |
|
kfree(lseg); |
|
} |
|
|
|
/* Tracks info needed to ensure extents in layout obey constraints of spec */ |
|
struct layout_verification { |
|
u32 mode; /* R or RW */ |
|
u64 start; /* Expected start of next non-COW extent */ |
|
u64 inval; /* Start of INVAL coverage */ |
|
u64 cowread; /* End of COW read coverage */ |
|
}; |
|
|
|
/* Verify the extent meets the layout requirements of the pnfs-block draft, |
|
* section 2.3.1. |
|
*/ |
|
static int verify_extent(struct pnfs_block_extent *be, |
|
struct layout_verification *lv) |
|
{ |
|
if (lv->mode == IOMODE_READ) { |
|
if (be->be_state == PNFS_BLOCK_READWRITE_DATA || |
|
be->be_state == PNFS_BLOCK_INVALID_DATA) |
|
return -EIO; |
|
if (be->be_f_offset != lv->start) |
|
return -EIO; |
|
lv->start += be->be_length; |
|
return 0; |
|
} |
|
/* lv->mode == IOMODE_RW */ |
|
if (be->be_state == PNFS_BLOCK_READWRITE_DATA) { |
|
if (be->be_f_offset != lv->start) |
|
return -EIO; |
|
if (lv->cowread > lv->start) |
|
return -EIO; |
|
lv->start += be->be_length; |
|
lv->inval = lv->start; |
|
return 0; |
|
} else if (be->be_state == PNFS_BLOCK_INVALID_DATA) { |
|
if (be->be_f_offset != lv->start) |
|
return -EIO; |
|
lv->start += be->be_length; |
|
return 0; |
|
} else if (be->be_state == PNFS_BLOCK_READ_DATA) { |
|
if (be->be_f_offset > lv->start) |
|
return -EIO; |
|
if (be->be_f_offset < lv->inval) |
|
return -EIO; |
|
if (be->be_f_offset < lv->cowread) |
|
return -EIO; |
|
/* It looks like you might want to min this with lv->start, |
|
* but you really don't. |
|
*/ |
|
lv->inval = lv->inval + be->be_length; |
|
lv->cowread = be->be_f_offset + be->be_length; |
|
return 0; |
|
} else |
|
return -EIO; |
|
} |
|
|
|
static int decode_sector_number(__be32 **rp, sector_t *sp) |
|
{ |
|
uint64_t s; |
|
|
|
*rp = xdr_decode_hyper(*rp, &s); |
|
if (s & 0x1ff) { |
|
printk(KERN_WARNING "NFS: %s: sector not aligned\n", __func__); |
|
return -1; |
|
} |
|
*sp = s >> SECTOR_SHIFT; |
|
return 0; |
|
} |
|
|
|
static struct nfs4_deviceid_node * |
|
bl_find_get_deviceid(struct nfs_server *server, |
|
const struct nfs4_deviceid *id, const struct cred *cred, |
|
gfp_t gfp_mask) |
|
{ |
|
struct nfs4_deviceid_node *node; |
|
unsigned long start, end; |
|
|
|
retry: |
|
node = nfs4_find_get_deviceid(server, id, cred, gfp_mask); |
|
if (!node) |
|
return ERR_PTR(-ENODEV); |
|
|
|
if (test_bit(NFS_DEVICEID_UNAVAILABLE, &node->flags) == 0) |
|
return node; |
|
|
|
end = jiffies; |
|
start = end - PNFS_DEVICE_RETRY_TIMEOUT; |
|
if (!time_in_range(node->timestamp_unavailable, start, end)) { |
|
nfs4_delete_deviceid(node->ld, node->nfs_client, id); |
|
goto retry; |
|
} |
|
return ERR_PTR(-ENODEV); |
|
} |
|
|
|
static int |
|
bl_alloc_extent(struct xdr_stream *xdr, struct pnfs_layout_hdr *lo, |
|
struct layout_verification *lv, struct list_head *extents, |
|
gfp_t gfp_mask) |
|
{ |
|
struct pnfs_block_extent *be; |
|
struct nfs4_deviceid id; |
|
int error; |
|
__be32 *p; |
|
|
|
p = xdr_inline_decode(xdr, 28 + NFS4_DEVICEID4_SIZE); |
|
if (!p) |
|
return -EIO; |
|
|
|
be = kzalloc(sizeof(*be), GFP_NOFS); |
|
if (!be) |
|
return -ENOMEM; |
|
|
|
memcpy(&id, p, NFS4_DEVICEID4_SIZE); |
|
p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); |
|
|
|
be->be_device = bl_find_get_deviceid(NFS_SERVER(lo->plh_inode), &id, |
|
lo->plh_lc_cred, gfp_mask); |
|
if (IS_ERR(be->be_device)) { |
|
error = PTR_ERR(be->be_device); |
|
goto out_free_be; |
|
} |
|
|
|
/* |
|
* The next three values are read in as bytes, but stored in the |
|
* extent structure in 512-byte granularity. |
|
*/ |
|
error = -EIO; |
|
if (decode_sector_number(&p, &be->be_f_offset) < 0) |
|
goto out_put_deviceid; |
|
if (decode_sector_number(&p, &be->be_length) < 0) |
|
goto out_put_deviceid; |
|
if (decode_sector_number(&p, &be->be_v_offset) < 0) |
|
goto out_put_deviceid; |
|
be->be_state = be32_to_cpup(p++); |
|
|
|
error = verify_extent(be, lv); |
|
if (error) { |
|
dprintk("%s: extent verification failed\n", __func__); |
|
goto out_put_deviceid; |
|
} |
|
|
|
list_add_tail(&be->be_list, extents); |
|
return 0; |
|
|
|
out_put_deviceid: |
|
nfs4_put_deviceid_node(be->be_device); |
|
out_free_be: |
|
kfree(be); |
|
return error; |
|
} |
|
|
|
static struct pnfs_layout_segment * |
|
bl_alloc_lseg(struct pnfs_layout_hdr *lo, struct nfs4_layoutget_res *lgr, |
|
gfp_t gfp_mask) |
|
{ |
|
struct layout_verification lv = { |
|
.mode = lgr->range.iomode, |
|
.start = lgr->range.offset >> SECTOR_SHIFT, |
|
.inval = lgr->range.offset >> SECTOR_SHIFT, |
|
.cowread = lgr->range.offset >> SECTOR_SHIFT, |
|
}; |
|
struct pnfs_block_layout *bl = BLK_LO2EXT(lo); |
|
struct pnfs_layout_segment *lseg; |
|
struct xdr_buf buf; |
|
struct xdr_stream xdr; |
|
struct page *scratch; |
|
int status, i; |
|
uint32_t count; |
|
__be32 *p; |
|
LIST_HEAD(extents); |
|
|
|
dprintk("---> %s\n", __func__); |
|
|
|
lseg = kzalloc(sizeof(*lseg), gfp_mask); |
|
if (!lseg) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
status = -ENOMEM; |
|
scratch = alloc_page(gfp_mask); |
|
if (!scratch) |
|
goto out; |
|
|
|
xdr_init_decode_pages(&xdr, &buf, |
|
lgr->layoutp->pages, lgr->layoutp->len); |
|
xdr_set_scratch_page(&xdr, scratch); |
|
|
|
status = -EIO; |
|
p = xdr_inline_decode(&xdr, 4); |
|
if (unlikely(!p)) |
|
goto out_free_scratch; |
|
|
|
count = be32_to_cpup(p++); |
|
dprintk("%s: number of extents %d\n", __func__, count); |
|
|
|
/* |
|
* Decode individual extents, putting them in temporary staging area |
|
* until whole layout is decoded to make error recovery easier. |
|
*/ |
|
for (i = 0; i < count; i++) { |
|
status = bl_alloc_extent(&xdr, lo, &lv, &extents, gfp_mask); |
|
if (status) |
|
goto process_extents; |
|
} |
|
|
|
if (lgr->range.offset + lgr->range.length != |
|
lv.start << SECTOR_SHIFT) { |
|
dprintk("%s Final length mismatch\n", __func__); |
|
status = -EIO; |
|
goto process_extents; |
|
} |
|
|
|
if (lv.start < lv.cowread) { |
|
dprintk("%s Final uncovered COW extent\n", __func__); |
|
status = -EIO; |
|
} |
|
|
|
process_extents: |
|
while (!list_empty(&extents)) { |
|
struct pnfs_block_extent *be = |
|
list_first_entry(&extents, struct pnfs_block_extent, |
|
be_list); |
|
list_del(&be->be_list); |
|
|
|
if (!status) |
|
status = ext_tree_insert(bl, be); |
|
|
|
if (status) { |
|
nfs4_put_deviceid_node(be->be_device); |
|
kfree(be); |
|
} |
|
} |
|
|
|
out_free_scratch: |
|
__free_page(scratch); |
|
out: |
|
dprintk("%s returns %d\n", __func__, status); |
|
switch (status) { |
|
case -ENODEV: |
|
/* Our extent block devices are unavailable */ |
|
set_bit(NFS_LSEG_UNAVAILABLE, &lseg->pls_flags); |
|
fallthrough; |
|
case 0: |
|
return lseg; |
|
default: |
|
kfree(lseg); |
|
return ERR_PTR(status); |
|
} |
|
} |
|
|
|
static void |
|
bl_return_range(struct pnfs_layout_hdr *lo, |
|
struct pnfs_layout_range *range) |
|
{ |
|
struct pnfs_block_layout *bl = BLK_LO2EXT(lo); |
|
sector_t offset = range->offset >> SECTOR_SHIFT, end; |
|
|
|
if (range->offset % 8) { |
|
dprintk("%s: offset %lld not block size aligned\n", |
|
__func__, range->offset); |
|
return; |
|
} |
|
|
|
if (range->length != NFS4_MAX_UINT64) { |
|
if (range->length % 8) { |
|
dprintk("%s: length %lld not block size aligned\n", |
|
__func__, range->length); |
|
return; |
|
} |
|
|
|
end = offset + (range->length >> SECTOR_SHIFT); |
|
} else { |
|
end = round_down(NFS4_MAX_UINT64, PAGE_SIZE); |
|
} |
|
|
|
ext_tree_remove(bl, range->iomode & IOMODE_RW, offset, end); |
|
} |
|
|
|
static int |
|
bl_prepare_layoutcommit(struct nfs4_layoutcommit_args *arg) |
|
{ |
|
return ext_tree_prepare_commit(arg); |
|
} |
|
|
|
static void |
|
bl_cleanup_layoutcommit(struct nfs4_layoutcommit_data *lcdata) |
|
{ |
|
ext_tree_mark_committed(&lcdata->args, lcdata->res.status); |
|
} |
|
|
|
static int |
|
bl_set_layoutdriver(struct nfs_server *server, const struct nfs_fh *fh) |
|
{ |
|
dprintk("%s enter\n", __func__); |
|
|
|
if (server->pnfs_blksize == 0) { |
|
dprintk("%s Server did not return blksize\n", __func__); |
|
return -EINVAL; |
|
} |
|
if (server->pnfs_blksize > PAGE_SIZE) { |
|
printk(KERN_ERR "%s: pNFS blksize %d not supported.\n", |
|
__func__, server->pnfs_blksize); |
|
return -EINVAL; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static bool |
|
is_aligned_req(struct nfs_pageio_descriptor *pgio, |
|
struct nfs_page *req, unsigned int alignment, bool is_write) |
|
{ |
|
/* |
|
* Always accept buffered writes, higher layers take care of the |
|
* right alignment. |
|
*/ |
|
if (pgio->pg_dreq == NULL) |
|
return true; |
|
|
|
if (!IS_ALIGNED(req->wb_offset, alignment)) |
|
return false; |
|
|
|
if (IS_ALIGNED(req->wb_bytes, alignment)) |
|
return true; |
|
|
|
if (is_write && |
|
(req_offset(req) + req->wb_bytes == i_size_read(pgio->pg_inode))) { |
|
/* |
|
* If the write goes up to the inode size, just write |
|
* the full page. Data past the inode size is |
|
* guaranteed to be zeroed by the higher level client |
|
* code, and this behaviour is mandated by RFC 5663 |
|
* section 2.3.2. |
|
*/ |
|
return true; |
|
} |
|
|
|
return false; |
|
} |
|
|
|
static void |
|
bl_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) |
|
{ |
|
if (!is_aligned_req(pgio, req, SECTOR_SIZE, false)) { |
|
nfs_pageio_reset_read_mds(pgio); |
|
return; |
|
} |
|
|
|
pnfs_generic_pg_init_read(pgio, req); |
|
|
|
if (pgio->pg_lseg && |
|
test_bit(NFS_LSEG_UNAVAILABLE, &pgio->pg_lseg->pls_flags)) { |
|
pnfs_error_mark_layout_for_return(pgio->pg_inode, pgio->pg_lseg); |
|
pnfs_set_lo_fail(pgio->pg_lseg); |
|
nfs_pageio_reset_read_mds(pgio); |
|
} |
|
} |
|
|
|
/* |
|
* Return 0 if @req cannot be coalesced into @pgio, otherwise return the number |
|
* of bytes (maximum @req->wb_bytes) that can be coalesced. |
|
*/ |
|
static size_t |
|
bl_pg_test_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, |
|
struct nfs_page *req) |
|
{ |
|
if (!is_aligned_req(pgio, req, SECTOR_SIZE, false)) |
|
return 0; |
|
return pnfs_generic_pg_test(pgio, prev, req); |
|
} |
|
|
|
/* |
|
* Return the number of contiguous bytes for a given inode |
|
* starting at page frame idx. |
|
*/ |
|
static u64 pnfs_num_cont_bytes(struct inode *inode, pgoff_t idx) |
|
{ |
|
struct address_space *mapping = inode->i_mapping; |
|
pgoff_t end; |
|
|
|
/* Optimize common case that writes from 0 to end of file */ |
|
end = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE); |
|
if (end != inode->i_mapping->nrpages) { |
|
rcu_read_lock(); |
|
end = page_cache_next_miss(mapping, idx + 1, ULONG_MAX); |
|
rcu_read_unlock(); |
|
} |
|
|
|
if (!end) |
|
return i_size_read(inode) - (idx << PAGE_SHIFT); |
|
else |
|
return (end - idx) << PAGE_SHIFT; |
|
} |
|
|
|
static void |
|
bl_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) |
|
{ |
|
u64 wb_size; |
|
|
|
if (!is_aligned_req(pgio, req, PAGE_SIZE, true)) { |
|
nfs_pageio_reset_write_mds(pgio); |
|
return; |
|
} |
|
|
|
if (pgio->pg_dreq == NULL) |
|
wb_size = pnfs_num_cont_bytes(pgio->pg_inode, |
|
req->wb_index); |
|
else |
|
wb_size = nfs_dreq_bytes_left(pgio->pg_dreq); |
|
|
|
pnfs_generic_pg_init_write(pgio, req, wb_size); |
|
|
|
if (pgio->pg_lseg && |
|
test_bit(NFS_LSEG_UNAVAILABLE, &pgio->pg_lseg->pls_flags)) { |
|
|
|
pnfs_error_mark_layout_for_return(pgio->pg_inode, pgio->pg_lseg); |
|
pnfs_set_lo_fail(pgio->pg_lseg); |
|
nfs_pageio_reset_write_mds(pgio); |
|
} |
|
} |
|
|
|
/* |
|
* Return 0 if @req cannot be coalesced into @pgio, otherwise return the number |
|
* of bytes (maximum @req->wb_bytes) that can be coalesced. |
|
*/ |
|
static size_t |
|
bl_pg_test_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, |
|
struct nfs_page *req) |
|
{ |
|
if (!is_aligned_req(pgio, req, PAGE_SIZE, true)) |
|
return 0; |
|
return pnfs_generic_pg_test(pgio, prev, req); |
|
} |
|
|
|
static const struct nfs_pageio_ops bl_pg_read_ops = { |
|
.pg_init = bl_pg_init_read, |
|
.pg_test = bl_pg_test_read, |
|
.pg_doio = pnfs_generic_pg_readpages, |
|
.pg_cleanup = pnfs_generic_pg_cleanup, |
|
}; |
|
|
|
static const struct nfs_pageio_ops bl_pg_write_ops = { |
|
.pg_init = bl_pg_init_write, |
|
.pg_test = bl_pg_test_write, |
|
.pg_doio = pnfs_generic_pg_writepages, |
|
.pg_cleanup = pnfs_generic_pg_cleanup, |
|
}; |
|
|
|
static struct pnfs_layoutdriver_type blocklayout_type = { |
|
.id = LAYOUT_BLOCK_VOLUME, |
|
.name = "LAYOUT_BLOCK_VOLUME", |
|
.owner = THIS_MODULE, |
|
.flags = PNFS_LAYOUTRET_ON_SETATTR | |
|
PNFS_LAYOUTRET_ON_ERROR | |
|
PNFS_READ_WHOLE_PAGE, |
|
.read_pagelist = bl_read_pagelist, |
|
.write_pagelist = bl_write_pagelist, |
|
.alloc_layout_hdr = bl_alloc_layout_hdr, |
|
.free_layout_hdr = bl_free_layout_hdr, |
|
.alloc_lseg = bl_alloc_lseg, |
|
.free_lseg = bl_free_lseg, |
|
.return_range = bl_return_range, |
|
.prepare_layoutcommit = bl_prepare_layoutcommit, |
|
.cleanup_layoutcommit = bl_cleanup_layoutcommit, |
|
.set_layoutdriver = bl_set_layoutdriver, |
|
.alloc_deviceid_node = bl_alloc_deviceid_node, |
|
.free_deviceid_node = bl_free_deviceid_node, |
|
.pg_read_ops = &bl_pg_read_ops, |
|
.pg_write_ops = &bl_pg_write_ops, |
|
.sync = pnfs_generic_sync, |
|
}; |
|
|
|
static struct pnfs_layoutdriver_type scsilayout_type = { |
|
.id = LAYOUT_SCSI, |
|
.name = "LAYOUT_SCSI", |
|
.owner = THIS_MODULE, |
|
.flags = PNFS_LAYOUTRET_ON_SETATTR | |
|
PNFS_LAYOUTRET_ON_ERROR | |
|
PNFS_READ_WHOLE_PAGE, |
|
.read_pagelist = bl_read_pagelist, |
|
.write_pagelist = bl_write_pagelist, |
|
.alloc_layout_hdr = sl_alloc_layout_hdr, |
|
.free_layout_hdr = bl_free_layout_hdr, |
|
.alloc_lseg = bl_alloc_lseg, |
|
.free_lseg = bl_free_lseg, |
|
.return_range = bl_return_range, |
|
.prepare_layoutcommit = bl_prepare_layoutcommit, |
|
.cleanup_layoutcommit = bl_cleanup_layoutcommit, |
|
.set_layoutdriver = bl_set_layoutdriver, |
|
.alloc_deviceid_node = bl_alloc_deviceid_node, |
|
.free_deviceid_node = bl_free_deviceid_node, |
|
.pg_read_ops = &bl_pg_read_ops, |
|
.pg_write_ops = &bl_pg_write_ops, |
|
.sync = pnfs_generic_sync, |
|
}; |
|
|
|
|
|
static int __init nfs4blocklayout_init(void) |
|
{ |
|
int ret; |
|
|
|
dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__); |
|
|
|
ret = bl_init_pipefs(); |
|
if (ret) |
|
goto out; |
|
|
|
ret = pnfs_register_layoutdriver(&blocklayout_type); |
|
if (ret) |
|
goto out_cleanup_pipe; |
|
|
|
ret = pnfs_register_layoutdriver(&scsilayout_type); |
|
if (ret) |
|
goto out_unregister_block; |
|
return 0; |
|
|
|
out_unregister_block: |
|
pnfs_unregister_layoutdriver(&blocklayout_type); |
|
out_cleanup_pipe: |
|
bl_cleanup_pipefs(); |
|
out: |
|
return ret; |
|
} |
|
|
|
static void __exit nfs4blocklayout_exit(void) |
|
{ |
|
dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n", |
|
__func__); |
|
|
|
pnfs_unregister_layoutdriver(&scsilayout_type); |
|
pnfs_unregister_layoutdriver(&blocklayout_type); |
|
bl_cleanup_pipefs(); |
|
} |
|
|
|
MODULE_ALIAS("nfs-layouttype4-3"); |
|
MODULE_ALIAS("nfs-layouttype4-5"); |
|
|
|
module_init(nfs4blocklayout_init); |
|
module_exit(nfs4blocklayout_exit);
|
|
|