microsoft
/
WSL2-Linux-Kernel
зеркало из https://github.com/microsoft/WSL2-Linux-Kernel.git
1
0
Форкнуть 0
Код Задачи Пакеты Проекты Релизы Вики Активность
WSL2-Linux-Kernel/fs/gfs2/lops.c

935 строки
23 KiB
C
Исходник Ответственный История

/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2006 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/mempool.h>
#include <linux/gfs2_ondisk.h>
#include <linux/bio.h>
#include <linux/fs.h>
#include "gfs2.h"
#include "incore.h"
#include "inode.h"
#include "glock.h"
#include "log.h"
#include "lops.h"
#include "meta_io.h"
#include "recovery.h"
#include "rgrp.h"
#include "trans.h"
#include "util.h"
#include "trace_gfs2.h"
/**
* gfs2_pin - Pin a buffer in memory
* @sdp: The superblock
* @bh: The buffer to be pinned
*
* The log lock must be held when calling this function
*/
static void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh)
{
struct gfs2_bufdata *bd;
BUG_ON(!current->journal_info);
clear_buffer_dirty(bh);
if (test_set_buffer_pinned(bh))
gfs2_assert_withdraw(sdp, 0);
if (!buffer_uptodate(bh))
gfs2_io_error_bh(sdp, bh);
bd = bh->b_private;
/* If this buffer is in the AIL and it has already been written
* to in-place disk block, remove it from the AIL.
*/
spin_lock(&sdp->sd_ail_lock);
if (bd->bd_ail)
list_move(&bd->bd_ail_st_list, &bd->bd_ail->ai_ail2_list);
spin_unlock(&sdp->sd_ail_lock);
get_bh(bh);
atomic_inc(&sdp->sd_log_pinned);
trace_gfs2_pin(bd, 1);
}
static bool buffer_is_rgrp(const struct gfs2_bufdata *bd)
{
return bd->bd_gl->gl_name.ln_type == LM_TYPE_RGRP;
}
static void maybe_release_space(struct gfs2_bufdata *bd)
{
struct gfs2_glock *gl = bd->bd_gl;
struct gfs2_sbd *sdp = gl->gl_sbd;
struct gfs2_rgrpd *rgd = gl->gl_object;
unsigned int index = bd->bd_bh->b_blocknr - gl->gl_name.ln_number;
struct gfs2_bitmap *bi = rgd->rd_bits + index;
if (bi->bi_clone == 0)
return;
if (sdp->sd_args.ar_discard)
gfs2_rgrp_send_discards(sdp, rgd->rd_data0, bd->bd_bh, bi, 1, NULL);
memcpy(bi->bi_clone + bi->bi_offset,
bd->bd_bh->b_data + bi->bi_offset, bi->bi_len);
clear_bit(GBF_FULL, &bi->bi_flags);
rgd->rd_free_clone = rgd->rd_free;
}
/**
* gfs2_unpin - Unpin a buffer
* @sdp: the filesystem the buffer belongs to
* @bh: The buffer to unpin
* @ai:
* @flags: The inode dirty flags
*
*/
static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
struct gfs2_ail *ai)
{
struct gfs2_bufdata *bd = bh->b_private;
BUG_ON(!buffer_uptodate(bh));
BUG_ON(!buffer_pinned(bh));
lock_buffer(bh);
mark_buffer_dirty(bh);
clear_buffer_pinned(bh);
if (buffer_is_rgrp(bd))
maybe_release_space(bd);
spin_lock(&sdp->sd_ail_lock);
if (bd->bd_ail) {
list_del(&bd->bd_ail_st_list);
brelse(bh);
} else {
struct gfs2_glock *gl = bd->bd_gl;
list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list);
atomic_inc(&gl->gl_ail_count);
}
bd->bd_ail = ai;
list_add(&bd->bd_ail_st_list, &ai->ai_ail1_list);
spin_unlock(&sdp->sd_ail_lock);
clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
trace_gfs2_pin(bd, 0);
unlock_buffer(bh);
atomic_dec(&sdp->sd_log_pinned);
}
static void gfs2_log_incr_head(struct gfs2_sbd *sdp)
{
BUG_ON((sdp->sd_log_flush_head == sdp->sd_log_tail) &&
(sdp->sd_log_flush_head != sdp->sd_log_head));
if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) {
sdp->sd_log_flush_head = 0;
sdp->sd_log_flush_wrapped = 1;
}
}
static u64 gfs2_log_bmap(struct gfs2_sbd *sdp)
{
unsigned int lbn = sdp->sd_log_flush_head;
struct gfs2_journal_extent *je;
u64 block;
list_for_each_entry(je, &sdp->sd_jdesc->extent_list, extent_list) {
if (lbn >= je->lblock && lbn < je->lblock + je->blocks) {
block = je->dblock + lbn - je->lblock;
gfs2_log_incr_head(sdp);
return block;
}
}
return -1;
}
/**
* gfs2_end_log_write_bh - end log write of pagecache data with buffers
* @sdp: The superblock
* @bvec: The bio_vec
* @error: The i/o status
*
* This finds the relavent buffers and unlocks then and sets the
* error flag according to the status of the i/o request. This is
* used when the log is writing data which has an in-place version
* that is pinned in the pagecache.
*/
static void gfs2_end_log_write_bh(struct gfs2_sbd *sdp, struct bio_vec *bvec,
int error)
{
struct buffer_head *bh, *next;
struct page *page = bvec->bv_page;
unsigned size;
bh = page_buffers(page);
size = bvec->bv_len;
while (bh_offset(bh) < bvec->bv_offset)
bh = bh->b_this_page;
do {
if (error)
set_buffer_write_io_error(bh);
unlock_buffer(bh);
next = bh->b_this_page;
size -= bh->b_size;
brelse(bh);
bh = next;
} while(bh && size);
}
/**
* gfs2_end_log_write - end of i/o to the log
* @bio: The bio
* @error: Status of i/o request
*
* Each bio_vec contains either data from the pagecache or data
* relating to the log itself. Here we iterate over the bio_vec
* array, processing both kinds of data.
*
*/
static void gfs2_end_log_write(struct bio *bio, int error)
{
struct gfs2_sbd *sdp = bio->bi_private;
struct bio_vec *bvec;
struct page *page;
int i;
if (error) {
sdp->sd_log_error = error;
fs_err(sdp, "Error %d writing to log\n", error);
}
bio_for_each_segment(bvec, bio, i) {
page = bvec->bv_page;
if (page_has_buffers(page))
gfs2_end_log_write_bh(sdp, bvec, error);
else
mempool_free(page, gfs2_page_pool);
}
bio_put(bio);
if (atomic_dec_and_test(&sdp->sd_log_in_flight))
wake_up(&sdp->sd_log_flush_wait);
}
/**
* gfs2_log_flush_bio - Submit any pending log bio
* @sdp: The superblock
* @rw: The rw flags
*
* Submit any pending part-built or full bio to the block device. If
* there is no pending bio, then this is a no-op.
*/
void gfs2_log_flush_bio(struct gfs2_sbd *sdp, int rw)
{
if (sdp->sd_log_bio) {
atomic_inc(&sdp->sd_log_in_flight);
submit_bio(rw, sdp->sd_log_bio);
sdp->sd_log_bio = NULL;
}
}
/**
* gfs2_log_alloc_bio - Allocate a new bio for log writing
* @sdp: The superblock
* @blkno: The next device block number we want to write to
*
* This should never be called when there is a cached bio in the
* super block. When it returns, there will be a cached bio in the
* super block which will have as many bio_vecs as the device is
* happy to handle.
*
* Returns: Newly allocated bio
*/
static struct bio *gfs2_log_alloc_bio(struct gfs2_sbd *sdp, u64 blkno)
{
struct super_block *sb = sdp->sd_vfs;
unsigned nrvecs = bio_get_nr_vecs(sb->s_bdev);
struct bio *bio;
BUG_ON(sdp->sd_log_bio);
while (1) {
bio = bio_alloc(GFP_NOIO, nrvecs);
if (likely(bio))
break;
nrvecs = max(nrvecs/2, 1U);
}
bio->bi_sector = blkno * (sb->s_blocksize >> 9);
bio->bi_bdev = sb->s_bdev;
bio->bi_end_io = gfs2_end_log_write;
bio->bi_private = sdp;
sdp->sd_log_bio = bio;
return bio;
}
/**
* gfs2_log_get_bio - Get cached log bio, or allocate a new one
* @sdp: The superblock
* @blkno: The device block number we want to write to
*
* If there is a cached bio, then if the next block number is sequential
* with the previous one, return it, otherwise flush the bio to the
* device. If there is not a cached bio, or we just flushed it, then
* allocate a new one.
*
* Returns: The bio to use for log writes
*/
static struct bio *gfs2_log_get_bio(struct gfs2_sbd *sdp, u64 blkno)
{
struct bio *bio = sdp->sd_log_bio;
u64 nblk;
if (bio) {
nblk = bio->bi_sector + bio_sectors(bio);
nblk >>= sdp->sd_fsb2bb_shift;
if (blkno == nblk)
return bio;
gfs2_log_flush_bio(sdp, WRITE);
}
return gfs2_log_alloc_bio(sdp, blkno);
}
/**
* gfs2_log_write - write to log
* @sdp: the filesystem
* @page: the page to write
* @size: the size of the data to write
* @offset: the offset within the page
*
* Try and add the page segment to the current bio. If that fails,
* submit the current bio to the device and create a new one, and
* then add the page segment to that.
*/
static void gfs2_log_write(struct gfs2_sbd *sdp, struct page *page,
unsigned size, unsigned offset)
{
u64 blkno = gfs2_log_bmap(sdp);
struct bio *bio;
int ret;
bio = gfs2_log_get_bio(sdp, blkno);
ret = bio_add_page(bio, page, size, offset);
if (ret == 0) {
gfs2_log_flush_bio(sdp, WRITE);
bio = gfs2_log_alloc_bio(sdp, blkno);
ret = bio_add_page(bio, page, size, offset);
WARN_ON(ret == 0);
}
}
/**
* gfs2_log_write_bh - write a buffer's content to the log
* @sdp: The super block
* @bh: The buffer pointing to the in-place location
*
* This writes the content of the buffer to the next available location
* in the log. The buffer will be unlocked once the i/o to the log has
* completed.
*/
static void gfs2_log_write_bh(struct gfs2_sbd *sdp, struct buffer_head *bh)
{
gfs2_log_write(sdp, bh->b_page, bh->b_size, bh_offset(bh));
}
/**
* gfs2_log_write_page - write one block stored in a page, into the log
* @sdp: The superblock
* @page: The struct page
*
* This writes the first block-sized part of the page into the log. Note
* that the page must have been allocated from the gfs2_page_pool mempool
* and that after this has been called, ownership has been transferred and
* the page may be freed at any time.
*/
void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page)
{
struct super_block *sb = sdp->sd_vfs;
gfs2_log_write(sdp, page, sb->s_blocksize, 0);
}
static struct page *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type,
u32 ld_length, u32 ld_data1)
{
struct page *page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
struct gfs2_log_descriptor *ld = page_address(page);
clear_page(ld);
ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
ld->ld_type = cpu_to_be32(ld_type);
ld->ld_length = cpu_to_be32(ld_length);
ld->ld_data1 = cpu_to_be32(ld_data1);
ld->ld_data2 = 0;
return page;
}
static void buf_lo_add(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
{
struct gfs2_meta_header *mh;
struct gfs2_trans *tr;
lock_buffer(bd->bd_bh);
gfs2_log_lock(sdp);
tr = current->journal_info;
tr->tr_touched = 1;
if (!list_empty(&bd->bd_list))
goto out;
set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
gfs2_meta_check(sdp, bd->bd_bh);
gfs2_pin(sdp, bd->bd_bh);
mh = (struct gfs2_meta_header *)bd->bd_bh->b_data;
mh->__pad0 = cpu_to_be64(0);
mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
sdp->sd_log_num_buf++;
list_add(&bd->bd_list, &sdp->sd_log_le_buf);
tr->tr_num_buf_new++;
out:
gfs2_log_unlock(sdp);
unlock_buffer(bd->bd_bh);
}
static void gfs2_check_magic(struct buffer_head *bh)
{
void *kaddr;
__be32 *ptr;
clear_buffer_escaped(bh);
kaddr = kmap_atomic(bh->b_page);
ptr = kaddr + bh_offset(bh);
if (*ptr == cpu_to_be32(GFS2_MAGIC))
set_buffer_escaped(bh);
kunmap_atomic(kaddr);
}
static void gfs2_before_commit(struct gfs2_sbd *sdp, unsigned int limit,
unsigned int total, struct list_head *blist,
bool is_databuf)
{
struct gfs2_log_descriptor *ld;
struct gfs2_bufdata *bd1 = NULL, *bd2;
struct page *page;
unsigned int num;
unsigned n;
__be64 *ptr;
gfs2_log_lock(sdp);
bd1 = bd2 = list_prepare_entry(bd1, blist, bd_list);
while(total) {
num = total;
if (total > limit)
num = limit;
gfs2_log_unlock(sdp);
page = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_METADATA, num + 1, num);
ld = page_address(page);
gfs2_log_lock(sdp);
ptr = (__be64 *)(ld + 1);
n = 0;
list_for_each_entry_continue(bd1, blist, bd_list) {
*ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
if (is_databuf) {
gfs2_check_magic(bd1->bd_bh);
*ptr++ = cpu_to_be64(buffer_escaped(bd1->bd_bh) ? 1 : 0);
}
if (++n >= num)
break;
}
gfs2_log_unlock(sdp);
gfs2_log_write_page(sdp, page);
gfs2_log_lock(sdp);
n = 0;
list_for_each_entry_continue(bd2, blist, bd_list) {
get_bh(bd2->bd_bh);
gfs2_log_unlock(sdp);
lock_buffer(bd2->bd_bh);
if (buffer_escaped(bd2->bd_bh)) {
void *kaddr;
page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
ptr = page_address(page);
kaddr = kmap_atomic(bd2->bd_bh->b_page);
memcpy(ptr, kaddr + bh_offset(bd2->bd_bh),
bd2->bd_bh->b_size);
kunmap_atomic(kaddr);
*(__be32 *)ptr = 0;
clear_buffer_escaped(bd2->bd_bh);
unlock_buffer(bd2->bd_bh);
brelse(bd2->bd_bh);
gfs2_log_write_page(sdp, page);
} else {
gfs2_log_write_bh(sdp, bd2->bd_bh);
}
gfs2_log_lock(sdp);
if (++n >= num)
break;
}
BUG_ON(total < num);
total -= num;
}
gfs2_log_unlock(sdp);
}
static void buf_lo_before_commit(struct gfs2_sbd *sdp)
{
unsigned int limit = buf_limit(sdp); /* 503 for 4k blocks */
gfs2_before_commit(sdp, limit, sdp->sd_log_num_buf,
&sdp->sd_log_le_buf, 0);
}
static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
{
struct list_head *head = &sdp->sd_log_le_buf;
struct gfs2_bufdata *bd;
while (!list_empty(head)) {
bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
list_del_init(&bd->bd_list);
sdp->sd_log_num_buf--;
gfs2_unpin(sdp, bd->bd_bh, ai);
}
gfs2_assert_warn(sdp, !sdp->sd_log_num_buf);
}
static void buf_lo_before_scan(struct gfs2_jdesc *jd,
struct gfs2_log_header_host *head, int pass)
{
struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
if (pass != 0)
return;
sdp->sd_found_blocks = 0;
sdp->sd_replayed_blocks = 0;
}
static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
struct gfs2_log_descriptor *ld, __be64 *ptr,
int pass)
{
struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
struct gfs2_glock *gl = ip->i_gl;
unsigned int blks = be32_to_cpu(ld->ld_data1);
struct buffer_head *bh_log, *bh_ip;
u64 blkno;
int error = 0;
if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA)
return 0;
gfs2_replay_incr_blk(sdp, &start);
for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
blkno = be64_to_cpu(*ptr++);
sdp->sd_found_blocks++;
if (gfs2_revoke_check(sdp, blkno, start))
continue;
error = gfs2_replay_read_block(jd, start, &bh_log);
if (error)
return error;
bh_ip = gfs2_meta_new(gl, blkno);
memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
if (gfs2_meta_check(sdp, bh_ip))
error = -EIO;
else
mark_buffer_dirty(bh_ip);
brelse(bh_log);
brelse(bh_ip);
if (error)
break;
sdp->sd_replayed_blocks++;
}
return error;
}
static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
{
struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
if (error) {
gfs2_meta_sync(ip->i_gl);
return;
}
if (pass != 1)
return;
gfs2_meta_sync(ip->i_gl);
fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n",
jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
}
static void revoke_lo_add(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
{
struct gfs2_glock *gl = bd->bd_gl;
struct gfs2_trans *tr;
tr = current->journal_info;
tr->tr_touched = 1;
tr->tr_num_revoke++;
sdp->sd_log_num_revoke++;
atomic_inc(&gl->gl_revokes);
set_bit(GLF_LFLUSH, &gl->gl_flags);
list_add(&bd->bd_list, &sdp->sd_log_le_revoke);
}
static void revoke_lo_before_commit(struct gfs2_sbd *sdp)
{
struct gfs2_log_descriptor *ld;
struct gfs2_meta_header *mh;
unsigned int offset;
struct list_head *head = &sdp->sd_log_le_revoke;
struct gfs2_bufdata *bd;
struct page *page;
unsigned int length;
if (!sdp->sd_log_num_revoke)
return;
length = gfs2_struct2blk(sdp, sdp->sd_log_num_revoke, sizeof(u64));
page = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_REVOKE, length, sdp->sd_log_num_revoke);
ld = page_address(page);
offset = sizeof(struct gfs2_log_descriptor);
list_for_each_entry(bd, head, bd_list) {
sdp->sd_log_num_revoke--;
if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
gfs2_log_write_page(sdp, page);
page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
mh = page_address(page);
clear_page(mh);
mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB);
mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB);
offset = sizeof(struct gfs2_meta_header);
}
*(__be64 *)(page_address(page) + offset) = cpu_to_be64(bd->bd_blkno);
offset += sizeof(u64);
}
gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
gfs2_log_write_page(sdp, page);
}
static void revoke_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
{
struct list_head *head = &sdp->sd_log_le_revoke;
struct gfs2_bufdata *bd;
struct gfs2_glock *gl;
while (!list_empty(head)) {
bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
list_del_init(&bd->bd_list);
gl = bd->bd_gl;
atomic_dec(&gl->gl_revokes);
clear_bit(GLF_LFLUSH, &gl->gl_flags);
kmem_cache_free(gfs2_bufdata_cachep, bd);
}
}
static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
struct gfs2_log_header_host *head, int pass)
{
struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
if (pass != 0)
return;
sdp->sd_found_revokes = 0;
sdp->sd_replay_tail = head->lh_tail;
}
static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
struct gfs2_log_descriptor *ld, __be64 *ptr,
int pass)
{
struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
unsigned int blks = be32_to_cpu(ld->ld_length);
unsigned int revokes = be32_to_cpu(ld->ld_data1);
struct buffer_head *bh;
unsigned int offset;
u64 blkno;
int first = 1;
int error;
if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE)
return 0;
offset = sizeof(struct gfs2_log_descriptor);
for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
error = gfs2_replay_read_block(jd, start, &bh);
if (error)
return error;
if (!first)
gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB);
while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) {
blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset));
error = gfs2_revoke_add(sdp, blkno, start);
if (error < 0) {
brelse(bh);
return error;
}
else if (error)
sdp->sd_found_revokes++;
if (!--revokes)
break;
offset += sizeof(u64);
}
brelse(bh);
offset = sizeof(struct gfs2_meta_header);
first = 0;
}
return 0;
}
static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
{
struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
if (error) {
gfs2_revoke_clean(sdp);
return;
}
if (pass != 1)
return;
fs_info(sdp, "jid=%u: Found %u revoke tags\n",
jd->jd_jid, sdp->sd_found_revokes);
gfs2_revoke_clean(sdp);
}
/**
* databuf_lo_add - Add a databuf to the transaction.
*
* This is used in two distinct cases:
* i) In ordered write mode
* We put the data buffer on a list so that we can ensure that its
* synced to disk at the right time
* ii) In journaled data mode
* We need to journal the data block in the same way as metadata in
* the functions above. The difference is that here we have a tag
* which is two __be64's being the block number (as per meta data)
* and a flag which says whether the data block needs escaping or
* not. This means we need a new log entry for each 251 or so data
* blocks, which isn't an enormous overhead but twice as much as
* for normal metadata blocks.
*/
static void databuf_lo_add(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
{
struct gfs2_trans *tr = current->journal_info;
struct address_space *mapping = bd->bd_bh->b_page->mapping;
struct gfs2_inode *ip = GFS2_I(mapping->host);
lock_buffer(bd->bd_bh);
gfs2_log_lock(sdp);
if (tr)
tr->tr_touched = 1;
if (!list_empty(&bd->bd_list))
goto out;
set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
if (gfs2_is_jdata(ip)) {
gfs2_pin(sdp, bd->bd_bh);
tr->tr_num_databuf_new++;
sdp->sd_log_num_databuf++;
list_add_tail(&bd->bd_list, &sdp->sd_log_le_databuf);
} else {
list_add_tail(&bd->bd_list, &sdp->sd_log_le_ordered);
}
out:
gfs2_log_unlock(sdp);
unlock_buffer(bd->bd_bh);
}
/**
* databuf_lo_before_commit - Scan the data buffers, writing as we go
*
*/
static void databuf_lo_before_commit(struct gfs2_sbd *sdp)
{
unsigned int limit = buf_limit(sdp) / 2;
gfs2_before_commit(sdp, limit, sdp->sd_log_num_databuf,
&sdp->sd_log_le_databuf, 1);
}
static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
struct gfs2_log_descriptor *ld,
__be64 *ptr, int pass)
{
struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
struct gfs2_glock *gl = ip->i_gl;
unsigned int blks = be32_to_cpu(ld->ld_data1);
struct buffer_head *bh_log, *bh_ip;
u64 blkno;
u64 esc;
int error = 0;
if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA)
return 0;
gfs2_replay_incr_blk(sdp, &start);
for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
blkno = be64_to_cpu(*ptr++);
esc = be64_to_cpu(*ptr++);
sdp->sd_found_blocks++;
if (gfs2_revoke_check(sdp, blkno, start))
continue;
error = gfs2_replay_read_block(jd, start, &bh_log);
if (error)
return error;
bh_ip = gfs2_meta_new(gl, blkno);
memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
/* Unescape */
if (esc) {
__be32 *eptr = (__be32 *)bh_ip->b_data;
*eptr = cpu_to_be32(GFS2_MAGIC);
}
mark_buffer_dirty(bh_ip);
brelse(bh_log);
brelse(bh_ip);
sdp->sd_replayed_blocks++;
}
return error;
}
/* FIXME: sort out accounting for log blocks etc. */
static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
{
struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
if (error) {
gfs2_meta_sync(ip->i_gl);
return;
}
if (pass != 1)
return;
/* data sync? */
gfs2_meta_sync(ip->i_gl);
fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n",
jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
}
static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
{
struct list_head *head = &sdp->sd_log_le_databuf;
struct gfs2_bufdata *bd;
while (!list_empty(head)) {
bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
list_del_init(&bd->bd_list);
sdp->sd_log_num_databuf--;
gfs2_unpin(sdp, bd->bd_bh, ai);
}
gfs2_assert_warn(sdp, !sdp->sd_log_num_databuf);
}
const struct gfs2_log_operations gfs2_buf_lops = {
.lo_add = buf_lo_add,
.lo_before_commit = buf_lo_before_commit,
.lo_after_commit = buf_lo_after_commit,
.lo_before_scan = buf_lo_before_scan,
.lo_scan_elements = buf_lo_scan_elements,
.lo_after_scan = buf_lo_after_scan,
.lo_name = "buf",
};
const struct gfs2_log_operations gfs2_revoke_lops = {
.lo_add = revoke_lo_add,
.lo_before_commit = revoke_lo_before_commit,
.lo_after_commit = revoke_lo_after_commit,
.lo_before_scan = revoke_lo_before_scan,
.lo_scan_elements = revoke_lo_scan_elements,
.lo_after_scan = revoke_lo_after_scan,
.lo_name = "revoke",
};
const struct gfs2_log_operations gfs2_rg_lops = {
.lo_name = "rg",
};
const struct gfs2_log_operations gfs2_databuf_lops = {
.lo_add = databuf_lo_add,
.lo_before_commit = databuf_lo_before_commit,
.lo_after_commit = databuf_lo_after_commit,
.lo_scan_elements = databuf_lo_scan_elements,
.lo_after_scan = databuf_lo_after_scan,
.lo_name = "databuf",
};
const struct gfs2_log_operations *gfs2_log_ops[] = {
&gfs2_databuf_lops,
&gfs2_buf_lops,
&gfs2_rg_lops,
&gfs2_revoke_lops,
NULL,
};
Ссылка в новой задаче Показать git blame Копировать постоянную ссылку