mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 14:06:40 +07:00
7b6d91daee
Remove the current bio flags and reuse the request flags for the bio, too. This allows to more easily trace the type of I/O from the filesystem down to the block driver. There were two flags in the bio that were missing in the requests: BIO_RW_UNPLUG and BIO_RW_AHEAD. Also I've renamed two request flags that had a superflous RW in them. Note that the flags are in bio.h despite having the REQ_ name - as blkdev.h includes bio.h that is the only way to go for now. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
545 lines
14 KiB
C
545 lines
14 KiB
C
/*
|
|
* segbuf.c - NILFS segment buffer
|
|
*
|
|
* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
* Written by Ryusuke Konishi <ryusuke@osrg.net>
|
|
*
|
|
*/
|
|
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/writeback.h>
|
|
#include <linux/crc32.h>
|
|
#include <linux/backing-dev.h>
|
|
#include <linux/slab.h>
|
|
#include "page.h"
|
|
#include "segbuf.h"
|
|
|
|
|
|
struct nilfs_write_info {
|
|
struct the_nilfs *nilfs;
|
|
struct bio *bio;
|
|
int start, end; /* The region to be submitted */
|
|
int rest_blocks;
|
|
int max_pages;
|
|
int nr_vecs;
|
|
sector_t blocknr;
|
|
};
|
|
|
|
static int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf,
|
|
struct the_nilfs *nilfs);
|
|
static int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf);
|
|
|
|
struct nilfs_segment_buffer *nilfs_segbuf_new(struct super_block *sb)
|
|
{
|
|
struct nilfs_segment_buffer *segbuf;
|
|
|
|
segbuf = kmem_cache_alloc(nilfs_segbuf_cachep, GFP_NOFS);
|
|
if (unlikely(!segbuf))
|
|
return NULL;
|
|
|
|
segbuf->sb_super = sb;
|
|
INIT_LIST_HEAD(&segbuf->sb_list);
|
|
INIT_LIST_HEAD(&segbuf->sb_segsum_buffers);
|
|
INIT_LIST_HEAD(&segbuf->sb_payload_buffers);
|
|
segbuf->sb_super_root = NULL;
|
|
|
|
init_completion(&segbuf->sb_bio_event);
|
|
atomic_set(&segbuf->sb_err, 0);
|
|
segbuf->sb_nbio = 0;
|
|
|
|
return segbuf;
|
|
}
|
|
|
|
void nilfs_segbuf_free(struct nilfs_segment_buffer *segbuf)
|
|
{
|
|
kmem_cache_free(nilfs_segbuf_cachep, segbuf);
|
|
}
|
|
|
|
void nilfs_segbuf_map(struct nilfs_segment_buffer *segbuf, __u64 segnum,
|
|
unsigned long offset, struct the_nilfs *nilfs)
|
|
{
|
|
segbuf->sb_segnum = segnum;
|
|
nilfs_get_segment_range(nilfs, segnum, &segbuf->sb_fseg_start,
|
|
&segbuf->sb_fseg_end);
|
|
|
|
segbuf->sb_pseg_start = segbuf->sb_fseg_start + offset;
|
|
segbuf->sb_rest_blocks =
|
|
segbuf->sb_fseg_end - segbuf->sb_pseg_start + 1;
|
|
}
|
|
|
|
/**
|
|
* nilfs_segbuf_map_cont - map a new log behind a given log
|
|
* @segbuf: new segment buffer
|
|
* @prev: segment buffer containing a log to be continued
|
|
*/
|
|
void nilfs_segbuf_map_cont(struct nilfs_segment_buffer *segbuf,
|
|
struct nilfs_segment_buffer *prev)
|
|
{
|
|
segbuf->sb_segnum = prev->sb_segnum;
|
|
segbuf->sb_fseg_start = prev->sb_fseg_start;
|
|
segbuf->sb_fseg_end = prev->sb_fseg_end;
|
|
segbuf->sb_pseg_start = prev->sb_pseg_start + prev->sb_sum.nblocks;
|
|
segbuf->sb_rest_blocks =
|
|
segbuf->sb_fseg_end - segbuf->sb_pseg_start + 1;
|
|
}
|
|
|
|
void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *segbuf,
|
|
__u64 nextnum, struct the_nilfs *nilfs)
|
|
{
|
|
segbuf->sb_nextnum = nextnum;
|
|
segbuf->sb_sum.next = nilfs_get_segment_start_blocknr(nilfs, nextnum);
|
|
}
|
|
|
|
int nilfs_segbuf_extend_segsum(struct nilfs_segment_buffer *segbuf)
|
|
{
|
|
struct buffer_head *bh;
|
|
|
|
bh = sb_getblk(segbuf->sb_super,
|
|
segbuf->sb_pseg_start + segbuf->sb_sum.nsumblk);
|
|
if (unlikely(!bh))
|
|
return -ENOMEM;
|
|
|
|
nilfs_segbuf_add_segsum_buffer(segbuf, bh);
|
|
return 0;
|
|
}
|
|
|
|
int nilfs_segbuf_extend_payload(struct nilfs_segment_buffer *segbuf,
|
|
struct buffer_head **bhp)
|
|
{
|
|
struct buffer_head *bh;
|
|
|
|
bh = sb_getblk(segbuf->sb_super,
|
|
segbuf->sb_pseg_start + segbuf->sb_sum.nblocks);
|
|
if (unlikely(!bh))
|
|
return -ENOMEM;
|
|
|
|
nilfs_segbuf_add_payload_buffer(segbuf, bh);
|
|
*bhp = bh;
|
|
return 0;
|
|
}
|
|
|
|
int nilfs_segbuf_reset(struct nilfs_segment_buffer *segbuf, unsigned flags,
|
|
time_t ctime, __u64 cno)
|
|
{
|
|
int err;
|
|
|
|
segbuf->sb_sum.nblocks = segbuf->sb_sum.nsumblk = 0;
|
|
err = nilfs_segbuf_extend_segsum(segbuf);
|
|
if (unlikely(err))
|
|
return err;
|
|
|
|
segbuf->sb_sum.flags = flags;
|
|
segbuf->sb_sum.sumbytes = sizeof(struct nilfs_segment_summary);
|
|
segbuf->sb_sum.nfinfo = segbuf->sb_sum.nfileblk = 0;
|
|
segbuf->sb_sum.ctime = ctime;
|
|
segbuf->sb_sum.cno = cno;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Setup segment summary
|
|
*/
|
|
void nilfs_segbuf_fill_in_segsum(struct nilfs_segment_buffer *segbuf)
|
|
{
|
|
struct nilfs_segment_summary *raw_sum;
|
|
struct buffer_head *bh_sum;
|
|
|
|
bh_sum = list_entry(segbuf->sb_segsum_buffers.next,
|
|
struct buffer_head, b_assoc_buffers);
|
|
raw_sum = (struct nilfs_segment_summary *)bh_sum->b_data;
|
|
|
|
raw_sum->ss_magic = cpu_to_le32(NILFS_SEGSUM_MAGIC);
|
|
raw_sum->ss_bytes = cpu_to_le16(sizeof(*raw_sum));
|
|
raw_sum->ss_flags = cpu_to_le16(segbuf->sb_sum.flags);
|
|
raw_sum->ss_seq = cpu_to_le64(segbuf->sb_sum.seg_seq);
|
|
raw_sum->ss_create = cpu_to_le64(segbuf->sb_sum.ctime);
|
|
raw_sum->ss_next = cpu_to_le64(segbuf->sb_sum.next);
|
|
raw_sum->ss_nblocks = cpu_to_le32(segbuf->sb_sum.nblocks);
|
|
raw_sum->ss_nfinfo = cpu_to_le32(segbuf->sb_sum.nfinfo);
|
|
raw_sum->ss_sumbytes = cpu_to_le32(segbuf->sb_sum.sumbytes);
|
|
raw_sum->ss_pad = 0;
|
|
raw_sum->ss_cno = cpu_to_le64(segbuf->sb_sum.cno);
|
|
}
|
|
|
|
/*
|
|
* CRC calculation routines
|
|
*/
|
|
static void
|
|
nilfs_segbuf_fill_in_segsum_crc(struct nilfs_segment_buffer *segbuf, u32 seed)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct nilfs_segment_summary *raw_sum;
|
|
unsigned long size, bytes = segbuf->sb_sum.sumbytes;
|
|
u32 crc;
|
|
|
|
bh = list_entry(segbuf->sb_segsum_buffers.next, struct buffer_head,
|
|
b_assoc_buffers);
|
|
|
|
raw_sum = (struct nilfs_segment_summary *)bh->b_data;
|
|
size = min_t(unsigned long, bytes, bh->b_size);
|
|
crc = crc32_le(seed,
|
|
(unsigned char *)raw_sum +
|
|
sizeof(raw_sum->ss_datasum) + sizeof(raw_sum->ss_sumsum),
|
|
size - (sizeof(raw_sum->ss_datasum) +
|
|
sizeof(raw_sum->ss_sumsum)));
|
|
|
|
list_for_each_entry_continue(bh, &segbuf->sb_segsum_buffers,
|
|
b_assoc_buffers) {
|
|
bytes -= size;
|
|
size = min_t(unsigned long, bytes, bh->b_size);
|
|
crc = crc32_le(crc, bh->b_data, size);
|
|
}
|
|
raw_sum->ss_sumsum = cpu_to_le32(crc);
|
|
}
|
|
|
|
static void nilfs_segbuf_fill_in_data_crc(struct nilfs_segment_buffer *segbuf,
|
|
u32 seed)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct nilfs_segment_summary *raw_sum;
|
|
void *kaddr;
|
|
u32 crc;
|
|
|
|
bh = list_entry(segbuf->sb_segsum_buffers.next, struct buffer_head,
|
|
b_assoc_buffers);
|
|
raw_sum = (struct nilfs_segment_summary *)bh->b_data;
|
|
crc = crc32_le(seed,
|
|
(unsigned char *)raw_sum + sizeof(raw_sum->ss_datasum),
|
|
bh->b_size - sizeof(raw_sum->ss_datasum));
|
|
|
|
list_for_each_entry_continue(bh, &segbuf->sb_segsum_buffers,
|
|
b_assoc_buffers) {
|
|
crc = crc32_le(crc, bh->b_data, bh->b_size);
|
|
}
|
|
list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) {
|
|
kaddr = kmap_atomic(bh->b_page, KM_USER0);
|
|
crc = crc32_le(crc, kaddr + bh_offset(bh), bh->b_size);
|
|
kunmap_atomic(kaddr, KM_USER0);
|
|
}
|
|
raw_sum->ss_datasum = cpu_to_le32(crc);
|
|
}
|
|
|
|
static void
|
|
nilfs_segbuf_fill_in_super_root_crc(struct nilfs_segment_buffer *segbuf,
|
|
u32 seed)
|
|
{
|
|
struct nilfs_super_root *raw_sr;
|
|
u32 crc;
|
|
|
|
raw_sr = (struct nilfs_super_root *)segbuf->sb_super_root->b_data;
|
|
crc = crc32_le(seed,
|
|
(unsigned char *)raw_sr + sizeof(raw_sr->sr_sum),
|
|
NILFS_SR_BYTES - sizeof(raw_sr->sr_sum));
|
|
raw_sr->sr_sum = cpu_to_le32(crc);
|
|
}
|
|
|
|
static void nilfs_release_buffers(struct list_head *list)
|
|
{
|
|
struct buffer_head *bh, *n;
|
|
|
|
list_for_each_entry_safe(bh, n, list, b_assoc_buffers) {
|
|
list_del_init(&bh->b_assoc_buffers);
|
|
if (buffer_nilfs_allocated(bh)) {
|
|
struct page *clone_page = bh->b_page;
|
|
|
|
/* remove clone page */
|
|
brelse(bh);
|
|
page_cache_release(clone_page); /* for each bh */
|
|
if (page_count(clone_page) <= 2) {
|
|
lock_page(clone_page);
|
|
nilfs_free_private_page(clone_page);
|
|
}
|
|
continue;
|
|
}
|
|
brelse(bh);
|
|
}
|
|
}
|
|
|
|
static void nilfs_segbuf_clear(struct nilfs_segment_buffer *segbuf)
|
|
{
|
|
nilfs_release_buffers(&segbuf->sb_segsum_buffers);
|
|
nilfs_release_buffers(&segbuf->sb_payload_buffers);
|
|
segbuf->sb_super_root = NULL;
|
|
}
|
|
|
|
/*
|
|
* Iterators for segment buffers
|
|
*/
|
|
void nilfs_clear_logs(struct list_head *logs)
|
|
{
|
|
struct nilfs_segment_buffer *segbuf;
|
|
|
|
list_for_each_entry(segbuf, logs, sb_list)
|
|
nilfs_segbuf_clear(segbuf);
|
|
}
|
|
|
|
void nilfs_truncate_logs(struct list_head *logs,
|
|
struct nilfs_segment_buffer *last)
|
|
{
|
|
struct nilfs_segment_buffer *n, *segbuf;
|
|
|
|
segbuf = list_prepare_entry(last, logs, sb_list);
|
|
list_for_each_entry_safe_continue(segbuf, n, logs, sb_list) {
|
|
list_del_init(&segbuf->sb_list);
|
|
nilfs_segbuf_clear(segbuf);
|
|
nilfs_segbuf_free(segbuf);
|
|
}
|
|
}
|
|
|
|
int nilfs_write_logs(struct list_head *logs, struct the_nilfs *nilfs)
|
|
{
|
|
struct nilfs_segment_buffer *segbuf;
|
|
int ret = 0;
|
|
|
|
list_for_each_entry(segbuf, logs, sb_list) {
|
|
ret = nilfs_segbuf_write(segbuf, nilfs);
|
|
if (ret)
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int nilfs_wait_on_logs(struct list_head *logs)
|
|
{
|
|
struct nilfs_segment_buffer *segbuf;
|
|
int err, ret = 0;
|
|
|
|
list_for_each_entry(segbuf, logs, sb_list) {
|
|
err = nilfs_segbuf_wait(segbuf);
|
|
if (err && !ret)
|
|
ret = err;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* nilfs_add_checksums_on_logs - add checksums on the logs
|
|
* @logs: list of segment buffers storing target logs
|
|
* @seed: checksum seed value
|
|
*/
|
|
void nilfs_add_checksums_on_logs(struct list_head *logs, u32 seed)
|
|
{
|
|
struct nilfs_segment_buffer *segbuf;
|
|
|
|
list_for_each_entry(segbuf, logs, sb_list) {
|
|
if (segbuf->sb_super_root)
|
|
nilfs_segbuf_fill_in_super_root_crc(segbuf, seed);
|
|
nilfs_segbuf_fill_in_segsum_crc(segbuf, seed);
|
|
nilfs_segbuf_fill_in_data_crc(segbuf, seed);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* BIO operations
|
|
*/
|
|
static void nilfs_end_bio_write(struct bio *bio, int err)
|
|
{
|
|
const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
|
|
struct nilfs_segment_buffer *segbuf = bio->bi_private;
|
|
|
|
if (err == -EOPNOTSUPP) {
|
|
set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
|
|
bio_put(bio);
|
|
/* to be detected by submit_seg_bio() */
|
|
}
|
|
|
|
if (!uptodate)
|
|
atomic_inc(&segbuf->sb_err);
|
|
|
|
bio_put(bio);
|
|
complete(&segbuf->sb_bio_event);
|
|
}
|
|
|
|
static int nilfs_segbuf_submit_bio(struct nilfs_segment_buffer *segbuf,
|
|
struct nilfs_write_info *wi, int mode)
|
|
{
|
|
struct bio *bio = wi->bio;
|
|
int err;
|
|
|
|
if (segbuf->sb_nbio > 0 && bdi_write_congested(wi->nilfs->ns_bdi)) {
|
|
wait_for_completion(&segbuf->sb_bio_event);
|
|
segbuf->sb_nbio--;
|
|
if (unlikely(atomic_read(&segbuf->sb_err))) {
|
|
bio_put(bio);
|
|
err = -EIO;
|
|
goto failed;
|
|
}
|
|
}
|
|
|
|
bio->bi_end_io = nilfs_end_bio_write;
|
|
bio->bi_private = segbuf;
|
|
bio_get(bio);
|
|
submit_bio(mode, bio);
|
|
if (bio_flagged(bio, BIO_EOPNOTSUPP)) {
|
|
bio_put(bio);
|
|
err = -EOPNOTSUPP;
|
|
goto failed;
|
|
}
|
|
segbuf->sb_nbio++;
|
|
bio_put(bio);
|
|
|
|
wi->bio = NULL;
|
|
wi->rest_blocks -= wi->end - wi->start;
|
|
wi->nr_vecs = min(wi->max_pages, wi->rest_blocks);
|
|
wi->start = wi->end;
|
|
return 0;
|
|
|
|
failed:
|
|
wi->bio = NULL;
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* nilfs_alloc_seg_bio - allocate a new bio for writing log
|
|
* @nilfs: nilfs object
|
|
* @start: start block number of the bio
|
|
* @nr_vecs: request size of page vector.
|
|
*
|
|
* Return Value: On success, pointer to the struct bio is returned.
|
|
* On error, NULL is returned.
|
|
*/
|
|
static struct bio *nilfs_alloc_seg_bio(struct the_nilfs *nilfs, sector_t start,
|
|
int nr_vecs)
|
|
{
|
|
struct bio *bio;
|
|
|
|
bio = bio_alloc(GFP_NOIO, nr_vecs);
|
|
if (bio == NULL) {
|
|
while (!bio && (nr_vecs >>= 1))
|
|
bio = bio_alloc(GFP_NOIO, nr_vecs);
|
|
}
|
|
if (likely(bio)) {
|
|
bio->bi_bdev = nilfs->ns_bdev;
|
|
bio->bi_sector = start << (nilfs->ns_blocksize_bits - 9);
|
|
}
|
|
return bio;
|
|
}
|
|
|
|
static void nilfs_segbuf_prepare_write(struct nilfs_segment_buffer *segbuf,
|
|
struct nilfs_write_info *wi)
|
|
{
|
|
wi->bio = NULL;
|
|
wi->rest_blocks = segbuf->sb_sum.nblocks;
|
|
wi->max_pages = bio_get_nr_vecs(wi->nilfs->ns_bdev);
|
|
wi->nr_vecs = min(wi->max_pages, wi->rest_blocks);
|
|
wi->start = wi->end = 0;
|
|
wi->blocknr = segbuf->sb_pseg_start;
|
|
}
|
|
|
|
static int nilfs_segbuf_submit_bh(struct nilfs_segment_buffer *segbuf,
|
|
struct nilfs_write_info *wi,
|
|
struct buffer_head *bh, int mode)
|
|
{
|
|
int len, err;
|
|
|
|
BUG_ON(wi->nr_vecs <= 0);
|
|
repeat:
|
|
if (!wi->bio) {
|
|
wi->bio = nilfs_alloc_seg_bio(wi->nilfs, wi->blocknr + wi->end,
|
|
wi->nr_vecs);
|
|
if (unlikely(!wi->bio))
|
|
return -ENOMEM;
|
|
}
|
|
|
|
len = bio_add_page(wi->bio, bh->b_page, bh->b_size, bh_offset(bh));
|
|
if (len == bh->b_size) {
|
|
wi->end++;
|
|
return 0;
|
|
}
|
|
/* bio is FULL */
|
|
err = nilfs_segbuf_submit_bio(segbuf, wi, mode);
|
|
/* never submit current bh */
|
|
if (likely(!err))
|
|
goto repeat;
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* nilfs_segbuf_write - submit write requests of a log
|
|
* @segbuf: buffer storing a log to be written
|
|
* @nilfs: nilfs object
|
|
*
|
|
* Return Value: On Success, 0 is returned. On Error, one of the following
|
|
* negative error code is returned.
|
|
*
|
|
* %-EIO - I/O error
|
|
*
|
|
* %-ENOMEM - Insufficient memory available.
|
|
*/
|
|
static int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf,
|
|
struct the_nilfs *nilfs)
|
|
{
|
|
struct nilfs_write_info wi;
|
|
struct buffer_head *bh;
|
|
int res = 0, rw = WRITE;
|
|
|
|
wi.nilfs = nilfs;
|
|
nilfs_segbuf_prepare_write(segbuf, &wi);
|
|
|
|
list_for_each_entry(bh, &segbuf->sb_segsum_buffers, b_assoc_buffers) {
|
|
res = nilfs_segbuf_submit_bh(segbuf, &wi, bh, rw);
|
|
if (unlikely(res))
|
|
goto failed_bio;
|
|
}
|
|
|
|
list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) {
|
|
res = nilfs_segbuf_submit_bh(segbuf, &wi, bh, rw);
|
|
if (unlikely(res))
|
|
goto failed_bio;
|
|
}
|
|
|
|
if (wi.bio) {
|
|
/*
|
|
* Last BIO is always sent through the following
|
|
* submission.
|
|
*/
|
|
rw |= REQ_SYNC | REQ_UNPLUG;
|
|
res = nilfs_segbuf_submit_bio(segbuf, &wi, rw);
|
|
}
|
|
|
|
failed_bio:
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* nilfs_segbuf_wait - wait for completion of requested BIOs
|
|
* @segbuf: segment buffer
|
|
*
|
|
* Return Value: On Success, 0 is returned. On Error, one of the following
|
|
* negative error code is returned.
|
|
*
|
|
* %-EIO - I/O error
|
|
*/
|
|
static int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf)
|
|
{
|
|
int err = 0;
|
|
|
|
if (!segbuf->sb_nbio)
|
|
return 0;
|
|
|
|
do {
|
|
wait_for_completion(&segbuf->sb_bio_event);
|
|
} while (--segbuf->sb_nbio > 0);
|
|
|
|
if (unlikely(atomic_read(&segbuf->sb_err) > 0)) {
|
|
printk(KERN_ERR "NILFS: IO error writing segment\n");
|
|
err = -EIO;
|
|
}
|
|
return err;
|
|
}
|