mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
Pull block layer updates from Jens Axboe: "This is the first pull request for 4.14, containing most of the code changes. It's a quiet series this round, which I think we needed after the churn of the last few series. This contains: - Fix for a registration race in loop, from Anton Volkov. - Overflow complaint fix from Arnd for DAC960. - Series of drbd changes from the usual suspects. - Conversion of the stec/skd driver to blk-mq. From Bart. - A few BFQ improvements/fixes from Paolo. - CFQ improvement from Ritesh, allowing idling for group idle. - A few fixes found by Dan's smatch, courtesy of Dan. - A warning fixup for a race between changing the IO scheduler and device remova. From David Jeffery. - A few nbd fixes from Josef. - Support for cgroup info in blktrace, from Shaohua. - Also from Shaohua, new features in the null_blk driver to allow it to actually hold data, among other things. - Various corner cases and error handling fixes from Weiping Zhang. - Improvements to the IO stats tracking for blk-mq from me. Can drastically improve performance for fast devices and/or big machines. - Series from Christoph removing bi_bdev as being needed for IO submission, in preparation for nvme multipathing code. - Series from Bart, including various cleanups and fixes for switch fall through case complaints" * 'for-4.14/block' of git://git.kernel.dk/linux-block: (162 commits) kernfs: checking for IS_ERR() instead of NULL drbd: remove BIOSET_NEED_RESCUER flag from drbd_{md_,}io_bio_set drbd: Fix allyesconfig build, fix recent commit drbd: switch from kmalloc() to kmalloc_array() drbd: abort drbd_start_resync if there is no connection drbd: move global variables to drbd namespace and make some static drbd: rename "usermode_helper" to "drbd_usermode_helper" drbd: fix race between handshake and admin disconnect/down drbd: fix potential deadlock when trying to detach during handshake drbd: A single dot should be put into a sequence. drbd: fix rmmod cleanup, remove _all_ debugfs entries drbd: Use setup_timer() instead of init_timer() to simplify the code. drbd: fix potential get_ldev/put_ldev refcount imbalance during attach drbd: new disk-option disable-write-same drbd: Fix resource role for newly created resources in events2 drbd: mark symbols static where possible drbd: Send P_NEG_ACK upon write error in protocol != C drbd: add explicit plugging when submitting batches drbd: change list_for_each_safe to while(list_first_entry_or_null) drbd: introduce drbd_recv_header_maybe_unplug ...
479 lines
11 KiB
C
479 lines
11 KiB
C
/*
|
|
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
|
|
* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
|
|
*
|
|
* This copyrighted material is made available to anyone wishing to use,
|
|
* modify, copy, or redistribute it subject to the terms and conditions
|
|
* of the GNU General Public License version 2.
|
|
*/
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/writeback.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/bio.h>
|
|
#include <linux/gfs2_ondisk.h>
|
|
|
|
#include "gfs2.h"
|
|
#include "incore.h"
|
|
#include "glock.h"
|
|
#include "glops.h"
|
|
#include "inode.h"
|
|
#include "log.h"
|
|
#include "lops.h"
|
|
#include "meta_io.h"
|
|
#include "rgrp.h"
|
|
#include "trans.h"
|
|
#include "util.h"
|
|
#include "trace_gfs2.h"
|
|
|
|
static int gfs2_aspace_writepage(struct page *page, struct writeback_control *wbc)
|
|
{
|
|
struct buffer_head *bh, *head;
|
|
int nr_underway = 0;
|
|
int write_flags = REQ_META | REQ_PRIO | wbc_to_write_flags(wbc);
|
|
|
|
BUG_ON(!PageLocked(page));
|
|
BUG_ON(!page_has_buffers(page));
|
|
|
|
head = page_buffers(page);
|
|
bh = head;
|
|
|
|
do {
|
|
if (!buffer_mapped(bh))
|
|
continue;
|
|
/*
|
|
* If it's a fully non-blocking write attempt and we cannot
|
|
* lock the buffer then redirty the page. Note that this can
|
|
* potentially cause a busy-wait loop from flusher thread and kswapd
|
|
* activity, but those code paths have their own higher-level
|
|
* throttling.
|
|
*/
|
|
if (wbc->sync_mode != WB_SYNC_NONE) {
|
|
lock_buffer(bh);
|
|
} else if (!trylock_buffer(bh)) {
|
|
redirty_page_for_writepage(wbc, page);
|
|
continue;
|
|
}
|
|
if (test_clear_buffer_dirty(bh)) {
|
|
mark_buffer_async_write(bh);
|
|
} else {
|
|
unlock_buffer(bh);
|
|
}
|
|
} while ((bh = bh->b_this_page) != head);
|
|
|
|
/*
|
|
* The page and its buffers are protected by PageWriteback(), so we can
|
|
* drop the bh refcounts early.
|
|
*/
|
|
BUG_ON(PageWriteback(page));
|
|
set_page_writeback(page);
|
|
|
|
do {
|
|
struct buffer_head *next = bh->b_this_page;
|
|
if (buffer_async_write(bh)) {
|
|
submit_bh(REQ_OP_WRITE, write_flags, bh);
|
|
nr_underway++;
|
|
}
|
|
bh = next;
|
|
} while (bh != head);
|
|
unlock_page(page);
|
|
|
|
if (nr_underway == 0)
|
|
end_page_writeback(page);
|
|
|
|
return 0;
|
|
}
|
|
|
|
const struct address_space_operations gfs2_meta_aops = {
|
|
.writepage = gfs2_aspace_writepage,
|
|
.releasepage = gfs2_releasepage,
|
|
};
|
|
|
|
const struct address_space_operations gfs2_rgrp_aops = {
|
|
.writepage = gfs2_aspace_writepage,
|
|
.releasepage = gfs2_releasepage,
|
|
};
|
|
|
|
/**
|
|
* gfs2_getbuf - Get a buffer with a given address space
|
|
* @gl: the glock
|
|
* @blkno: the block number (filesystem scope)
|
|
* @create: 1 if the buffer should be created
|
|
*
|
|
* Returns: the buffer
|
|
*/
|
|
|
|
struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, int create)
|
|
{
|
|
struct address_space *mapping = gfs2_glock2aspace(gl);
|
|
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
|
|
struct page *page;
|
|
struct buffer_head *bh;
|
|
unsigned int shift;
|
|
unsigned long index;
|
|
unsigned int bufnum;
|
|
|
|
if (mapping == NULL)
|
|
mapping = &sdp->sd_aspace;
|
|
|
|
shift = PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift;
|
|
index = blkno >> shift; /* convert block to page */
|
|
bufnum = blkno - (index << shift); /* block buf index within page */
|
|
|
|
if (create) {
|
|
for (;;) {
|
|
page = grab_cache_page(mapping, index);
|
|
if (page)
|
|
break;
|
|
yield();
|
|
}
|
|
} else {
|
|
page = find_get_page_flags(mapping, index,
|
|
FGP_LOCK|FGP_ACCESSED);
|
|
if (!page)
|
|
return NULL;
|
|
}
|
|
|
|
if (!page_has_buffers(page))
|
|
create_empty_buffers(page, sdp->sd_sb.sb_bsize, 0);
|
|
|
|
/* Locate header for our buffer within our page */
|
|
for (bh = page_buffers(page); bufnum--; bh = bh->b_this_page)
|
|
/* Do nothing */;
|
|
get_bh(bh);
|
|
|
|
if (!buffer_mapped(bh))
|
|
map_bh(bh, sdp->sd_vfs, blkno);
|
|
|
|
unlock_page(page);
|
|
put_page(page);
|
|
|
|
return bh;
|
|
}
|
|
|
|
static void meta_prep_new(struct buffer_head *bh)
|
|
{
|
|
struct gfs2_meta_header *mh = (struct gfs2_meta_header *)bh->b_data;
|
|
|
|
lock_buffer(bh);
|
|
clear_buffer_dirty(bh);
|
|
set_buffer_uptodate(bh);
|
|
unlock_buffer(bh);
|
|
|
|
mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
|
|
}
|
|
|
|
/**
|
|
* gfs2_meta_new - Get a block
|
|
* @gl: The glock associated with this block
|
|
* @blkno: The block number
|
|
*
|
|
* Returns: The buffer
|
|
*/
|
|
|
|
struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno)
|
|
{
|
|
struct buffer_head *bh;
|
|
bh = gfs2_getbuf(gl, blkno, CREATE);
|
|
meta_prep_new(bh);
|
|
return bh;
|
|
}
|
|
|
|
static void gfs2_meta_read_endio(struct bio *bio)
|
|
{
|
|
struct bio_vec *bvec;
|
|
int i;
|
|
|
|
bio_for_each_segment_all(bvec, bio, i) {
|
|
struct page *page = bvec->bv_page;
|
|
struct buffer_head *bh = page_buffers(page);
|
|
unsigned int len = bvec->bv_len;
|
|
|
|
while (bh_offset(bh) < bvec->bv_offset)
|
|
bh = bh->b_this_page;
|
|
do {
|
|
struct buffer_head *next = bh->b_this_page;
|
|
len -= bh->b_size;
|
|
bh->b_end_io(bh, !bio->bi_status);
|
|
bh = next;
|
|
} while (bh && len);
|
|
}
|
|
bio_put(bio);
|
|
}
|
|
|
|
/*
|
|
* Submit several consecutive buffer head I/O requests as a single bio I/O
|
|
* request. (See submit_bh_wbc.)
|
|
*/
|
|
static void gfs2_submit_bhs(int op, int op_flags, struct buffer_head *bhs[],
|
|
int num)
|
|
{
|
|
while (num > 0) {
|
|
struct buffer_head *bh = *bhs;
|
|
struct bio *bio;
|
|
|
|
bio = bio_alloc(GFP_NOIO, num);
|
|
bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9);
|
|
bio_set_dev(bio, bh->b_bdev);
|
|
while (num > 0) {
|
|
bh = *bhs;
|
|
if (!bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh))) {
|
|
BUG_ON(bio->bi_iter.bi_size == 0);
|
|
break;
|
|
}
|
|
bhs++;
|
|
num--;
|
|
}
|
|
bio->bi_end_io = gfs2_meta_read_endio;
|
|
bio_set_op_attrs(bio, op, op_flags);
|
|
submit_bio(bio);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gfs2_meta_read - Read a block from disk
|
|
* @gl: The glock covering the block
|
|
* @blkno: The block number
|
|
* @flags: flags
|
|
* @bhp: the place where the buffer is returned (NULL on failure)
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
|
|
int rahead, struct buffer_head **bhp)
|
|
{
|
|
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
|
|
struct buffer_head *bh, *bhs[2];
|
|
int num = 0;
|
|
|
|
if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) {
|
|
*bhp = NULL;
|
|
return -EIO;
|
|
}
|
|
|
|
*bhp = bh = gfs2_getbuf(gl, blkno, CREATE);
|
|
|
|
lock_buffer(bh);
|
|
if (buffer_uptodate(bh)) {
|
|
unlock_buffer(bh);
|
|
flags &= ~DIO_WAIT;
|
|
} else {
|
|
bh->b_end_io = end_buffer_read_sync;
|
|
get_bh(bh);
|
|
bhs[num++] = bh;
|
|
}
|
|
|
|
if (rahead) {
|
|
bh = gfs2_getbuf(gl, blkno + 1, CREATE);
|
|
|
|
lock_buffer(bh);
|
|
if (buffer_uptodate(bh)) {
|
|
unlock_buffer(bh);
|
|
brelse(bh);
|
|
} else {
|
|
bh->b_end_io = end_buffer_read_sync;
|
|
bhs[num++] = bh;
|
|
}
|
|
}
|
|
|
|
gfs2_submit_bhs(REQ_OP_READ, REQ_META | REQ_PRIO, bhs, num);
|
|
if (!(flags & DIO_WAIT))
|
|
return 0;
|
|
|
|
bh = *bhp;
|
|
wait_on_buffer(bh);
|
|
if (unlikely(!buffer_uptodate(bh))) {
|
|
struct gfs2_trans *tr = current->journal_info;
|
|
if (tr && test_bit(TR_TOUCHED, &tr->tr_flags))
|
|
gfs2_io_error_bh(sdp, bh);
|
|
brelse(bh);
|
|
*bhp = NULL;
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* gfs2_meta_wait - Reread a block from disk
|
|
* @sdp: the filesystem
|
|
* @bh: The block to wait for
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh)
|
|
{
|
|
if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
|
|
return -EIO;
|
|
|
|
wait_on_buffer(bh);
|
|
|
|
if (!buffer_uptodate(bh)) {
|
|
struct gfs2_trans *tr = current->journal_info;
|
|
if (tr && test_bit(TR_TOUCHED, &tr->tr_flags))
|
|
gfs2_io_error_bh(sdp, bh);
|
|
return -EIO;
|
|
}
|
|
if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
|
|
return -EIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void gfs2_remove_from_journal(struct buffer_head *bh, int meta)
|
|
{
|
|
struct address_space *mapping = bh->b_page->mapping;
|
|
struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
|
|
struct gfs2_bufdata *bd = bh->b_private;
|
|
struct gfs2_trans *tr = current->journal_info;
|
|
int was_pinned = 0;
|
|
|
|
if (test_clear_buffer_pinned(bh)) {
|
|
trace_gfs2_pin(bd, 0);
|
|
atomic_dec(&sdp->sd_log_pinned);
|
|
list_del_init(&bd->bd_list);
|
|
if (meta == REMOVE_META)
|
|
tr->tr_num_buf_rm++;
|
|
else
|
|
tr->tr_num_databuf_rm++;
|
|
set_bit(TR_TOUCHED, &tr->tr_flags);
|
|
was_pinned = 1;
|
|
brelse(bh);
|
|
}
|
|
if (bd) {
|
|
spin_lock(&sdp->sd_ail_lock);
|
|
if (bd->bd_tr) {
|
|
gfs2_trans_add_revoke(sdp, bd);
|
|
} else if (was_pinned) {
|
|
bh->b_private = NULL;
|
|
kmem_cache_free(gfs2_bufdata_cachep, bd);
|
|
}
|
|
spin_unlock(&sdp->sd_ail_lock);
|
|
}
|
|
clear_buffer_dirty(bh);
|
|
clear_buffer_uptodate(bh);
|
|
}
|
|
|
|
/**
|
|
* gfs2_meta_wipe - make inode's buffers so they aren't dirty/pinned anymore
|
|
* @ip: the inode who owns the buffers
|
|
* @bstart: the first buffer in the run
|
|
* @blen: the number of buffers in the run
|
|
*
|
|
*/
|
|
|
|
void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen)
|
|
{
|
|
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
|
|
struct buffer_head *bh;
|
|
|
|
while (blen) {
|
|
bh = gfs2_getbuf(ip->i_gl, bstart, NO_CREATE);
|
|
if (bh) {
|
|
lock_buffer(bh);
|
|
gfs2_log_lock(sdp);
|
|
gfs2_remove_from_journal(bh, REMOVE_META);
|
|
gfs2_log_unlock(sdp);
|
|
unlock_buffer(bh);
|
|
brelse(bh);
|
|
}
|
|
|
|
bstart++;
|
|
blen--;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gfs2_meta_indirect_buffer - Get a metadata buffer
|
|
* @ip: The GFS2 inode
|
|
* @height: The level of this buf in the metadata (indir addr) tree (if any)
|
|
* @num: The block number (device relative) of the buffer
|
|
* @bhp: the buffer is returned here
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
|
|
struct buffer_head **bhp)
|
|
{
|
|
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
|
|
struct gfs2_glock *gl = ip->i_gl;
|
|
struct buffer_head *bh;
|
|
int ret = 0;
|
|
u32 mtype = height ? GFS2_METATYPE_IN : GFS2_METATYPE_DI;
|
|
int rahead = 0;
|
|
|
|
if (num == ip->i_no_addr)
|
|
rahead = ip->i_rahead;
|
|
|
|
ret = gfs2_meta_read(gl, num, DIO_WAIT, rahead, &bh);
|
|
if (ret == 0 && gfs2_metatype_check(sdp, bh, mtype)) {
|
|
brelse(bh);
|
|
ret = -EIO;
|
|
} else {
|
|
*bhp = bh;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gfs2_meta_ra - start readahead on an extent of a file
|
|
* @gl: the glock the blocks belong to
|
|
* @dblock: the starting disk block
|
|
* @extlen: the number of blocks in the extent
|
|
*
|
|
* returns: the first buffer in the extent
|
|
*/
|
|
|
|
struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen)
|
|
{
|
|
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
|
|
struct buffer_head *first_bh, *bh;
|
|
u32 max_ra = gfs2_tune_get(sdp, gt_max_readahead) >>
|
|
sdp->sd_sb.sb_bsize_shift;
|
|
|
|
BUG_ON(!extlen);
|
|
|
|
if (max_ra < 1)
|
|
max_ra = 1;
|
|
if (extlen > max_ra)
|
|
extlen = max_ra;
|
|
|
|
first_bh = gfs2_getbuf(gl, dblock, CREATE);
|
|
|
|
if (buffer_uptodate(first_bh))
|
|
goto out;
|
|
if (!buffer_locked(first_bh))
|
|
ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &first_bh);
|
|
|
|
dblock++;
|
|
extlen--;
|
|
|
|
while (extlen) {
|
|
bh = gfs2_getbuf(gl, dblock, CREATE);
|
|
|
|
if (!buffer_uptodate(bh) && !buffer_locked(bh))
|
|
ll_rw_block(REQ_OP_READ,
|
|
REQ_RAHEAD | REQ_META | REQ_PRIO,
|
|
1, &bh);
|
|
brelse(bh);
|
|
dblock++;
|
|
extlen--;
|
|
if (!buffer_locked(first_bh) && buffer_uptodate(first_bh))
|
|
goto out;
|
|
}
|
|
|
|
wait_on_buffer(first_bh);
|
|
out:
|
|
return first_bh;
|
|
}
|
|
|