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OpenCloudOS-Kernel/fs/gfs2/lops.c

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/*
* 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/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);
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 inline struct gfs2_log_descriptor *bh_log_desc(struct buffer_head *bh)
{
return (struct gfs2_log_descriptor *)bh->b_data;
}
static inline __be64 *bh_log_ptr(struct buffer_head *bh)
{
struct gfs2_log_descriptor *ld = bh_log_desc(bh);
return (__force __be64 *)(ld + 1);
}
static inline __be64 *bh_ptr_end(struct buffer_head *bh)
{
return (__force __be64 *)(bh->b_data + bh->b_size);
}
static struct buffer_head *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type)
{
struct buffer_head *bh = gfs2_log_get_buf(sdp);
struct gfs2_log_descriptor *ld = bh_log_desc(bh);
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 = 0;
ld->ld_data1 = 0;
ld->ld_data2 = 0;
memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
return bh;
}
static void buf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
{
struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
struct gfs2_meta_header *mh;
struct gfs2_trans *tr;
lock_buffer(bd->bd_bh);
gfs2_log_lock(sdp);
if (!list_empty(&bd->bd_list_tr))
goto out;
tr = current->journal_info;
tr->tr_touched = 1;
tr->tr_num_buf++;
list_add(&bd->bd_list_tr, &tr->tr_list_buf);
if (!list_empty(&le->le_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(&le->le_list, &sdp->sd_log_le_buf);
tr->tr_num_buf_new++;
out:
gfs2_log_unlock(sdp);
unlock_buffer(bd->bd_bh);
}
static void buf_lo_before_commit(struct gfs2_sbd *sdp)
{
struct buffer_head *bh;
struct gfs2_log_descriptor *ld;
struct gfs2_bufdata *bd1 = NULL, *bd2;
unsigned int total;
unsigned int limit;
unsigned int num;
unsigned n;
__be64 *ptr;
limit = buf_limit(sdp);
/* for 4k blocks, limit = 503 */
gfs2_log_lock(sdp);
total = sdp->sd_log_num_buf;
bd1 = bd2 = list_prepare_entry(bd1, &sdp->sd_log_le_buf, bd_le.le_list);
while(total) {
num = total;
if (total > limit)
num = limit;
gfs2_log_unlock(sdp);
bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_METADATA);
gfs2_log_lock(sdp);
ld = bh_log_desc(bh);
ptr = bh_log_ptr(bh);
ld->ld_length = cpu_to_be32(num + 1);
ld->ld_data1 = cpu_to_be32(num);
n = 0;
list_for_each_entry_continue(bd1, &sdp->sd_log_le_buf,
bd_le.le_list) {
*ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
if (++n >= num)
break;
}
gfs2_log_unlock(sdp);
submit_bh(WRITE_SYNC, bh);
gfs2_log_lock(sdp);
n = 0;
list_for_each_entry_continue(bd2, &sdp->sd_log_le_buf,
bd_le.le_list) {
get_bh(bd2->bd_bh);
gfs2_log_unlock(sdp);
lock_buffer(bd2->bd_bh);
bh = gfs2_log_fake_buf(sdp, bd2->bd_bh);
submit_bh(WRITE_SYNC, bh);
gfs2_log_lock(sdp);
if (++n >= num)
break;
}
BUG_ON(total < num);
total -= num;
}
gfs2_log_unlock(sdp);
}
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_le.le_list);
list_del_init(&bd->bd_le.le_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_log_element *le)
{
struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
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(&le->le_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;
struct buffer_head *bh;
unsigned int offset;
struct list_head *head = &sdp->sd_log_le_revoke;
struct gfs2_bufdata *bd;
if (!sdp->sd_log_num_revoke)
return;
bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_REVOKE);
ld = bh_log_desc(bh);
ld->ld_length = cpu_to_be32(gfs2_struct2blk(sdp, sdp->sd_log_num_revoke,
sizeof(u64)));
ld->ld_data1 = cpu_to_be32(sdp->sd_log_num_revoke);
offset = sizeof(struct gfs2_log_descriptor);
list_for_each_entry(bd, head, bd_le.le_list) {
sdp->sd_log_num_revoke--;
if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
submit_bh(WRITE_SYNC, bh);
bh = gfs2_log_get_buf(sdp);
mh = (struct gfs2_meta_header *)bh->b_data;
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 *)(bh->b_data + offset) = cpu_to_be64(bd->bd_blkno);
offset += sizeof(u64);
}
gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
submit_bh(WRITE_SYNC, bh);
}
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_le.le_list);
list_del_init(&bd->bd_le.le_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_log_element *le)
{
struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
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) {
if (!list_empty(&bd->bd_list_tr))
goto out;
tr->tr_touched = 1;
if (gfs2_is_jdata(ip)) {
tr->tr_num_buf++;
list_add(&bd->bd_list_tr, &tr->tr_list_buf);
}
}
if (!list_empty(&le->le_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(&le->le_list, &sdp->sd_log_le_databuf);
} else {
list_add_tail(&le->le_list, &sdp->sd_log_le_ordered);
}
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, KM_USER0);
ptr = kaddr + bh_offset(bh);
if (*ptr == cpu_to_be32(GFS2_MAGIC))
set_buffer_escaped(bh);
kunmap_atomic(kaddr, KM_USER0);
}
static void gfs2_write_blocks(struct gfs2_sbd *sdp, struct buffer_head *bh,
struct list_head *list, struct list_head *done,
unsigned int n)
{
struct buffer_head *bh1;
struct gfs2_log_descriptor *ld;
struct gfs2_bufdata *bd;
__be64 *ptr;
if (!bh)
return;
ld = bh_log_desc(bh);
ld->ld_length = cpu_to_be32(n + 1);
ld->ld_data1 = cpu_to_be32(n);
ptr = bh_log_ptr(bh);
get_bh(bh);
submit_bh(WRITE_SYNC, bh);
gfs2_log_lock(sdp);
while(!list_empty(list)) {
bd = list_entry(list->next, struct gfs2_bufdata, bd_le.le_list);
list_move_tail(&bd->bd_le.le_list, done);
get_bh(bd->bd_bh);
while (be64_to_cpu(*ptr) != bd->bd_bh->b_blocknr) {
gfs2_log_incr_head(sdp);
ptr += 2;
}
gfs2_log_unlock(sdp);
lock_buffer(bd->bd_bh);
if (buffer_escaped(bd->bd_bh)) {
void *kaddr;
bh1 = gfs2_log_get_buf(sdp);
kaddr = kmap_atomic(bd->bd_bh->b_page, KM_USER0);
memcpy(bh1->b_data, kaddr + bh_offset(bd->bd_bh),
bh1->b_size);
kunmap_atomic(kaddr, KM_USER0);
*(__be32 *)bh1->b_data = 0;
clear_buffer_escaped(bd->bd_bh);
unlock_buffer(bd->bd_bh);
brelse(bd->bd_bh);
} else {
bh1 = gfs2_log_fake_buf(sdp, bd->bd_bh);
}
submit_bh(WRITE_SYNC, bh1);
gfs2_log_lock(sdp);
ptr += 2;
}
gfs2_log_unlock(sdp);
brelse(bh);
}
/**
* databuf_lo_before_commit - Scan the data buffers, writing as we go
*
*/
static void databuf_lo_before_commit(struct gfs2_sbd *sdp)
{
struct gfs2_bufdata *bd = NULL;
struct buffer_head *bh = NULL;
unsigned int n = 0;
__be64 *ptr = NULL, *end = NULL;
LIST_HEAD(processed);
LIST_HEAD(in_progress);
gfs2_log_lock(sdp);
while (!list_empty(&sdp->sd_log_le_databuf)) {
if (ptr == end) {
gfs2_log_unlock(sdp);
gfs2_write_blocks(sdp, bh, &in_progress, &processed, n);
n = 0;
bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_JDATA);
ptr = bh_log_ptr(bh);
end = bh_ptr_end(bh) - 1;
gfs2_log_lock(sdp);
continue;
}
bd = list_entry(sdp->sd_log_le_databuf.next, struct gfs2_bufdata, bd_le.le_list);
list_move_tail(&bd->bd_le.le_list, &in_progress);
gfs2_check_magic(bd->bd_bh);
*ptr++ = cpu_to_be64(bd->bd_bh->b_blocknr);
*ptr++ = cpu_to_be64(buffer_escaped(bh) ? 1 : 0);
n++;
}
gfs2_log_unlock(sdp);
gfs2_write_blocks(sdp, bh, &in_progress, &processed, n);
gfs2_log_lock(sdp);
list_splice(&processed, &sdp->sd_log_le_databuf);
gfs2_log_unlock(sdp);
}
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_le.le_list);
list_del_init(&bd->bd_le.le_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,
};
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