[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/fs/gfs2/lops.c b/ap/os/linux/linux-3.4.x/fs/gfs2/lops.c
new file mode 100644
index 0000000..a392e32
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/gfs2/lops.c
@@ -0,0 +1,864 @@
+/*
+ * 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 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);
+}
+
+/**
+ * gfs2_log_write_endio - End of I/O for a log buffer
+ * @bh: The buffer head
+ * @uptodate: I/O Status
+ *
+ */
+
+static void gfs2_log_write_endio(struct buffer_head *bh, int uptodate)
+{
+ struct gfs2_sbd *sdp = bh->b_private;
+ bh->b_private = NULL;
+
+ end_buffer_write_sync(bh, uptodate);
+ if (atomic_dec_and_test(&sdp->sd_log_in_flight))
+ wake_up(&sdp->sd_log_flush_wait);
+}
+
+/**
+ * gfs2_log_get_buf - Get and initialize a buffer to use for log control data
+ * @sdp: The GFS2 superblock
+ *
+ * tReturns: the buffer_head
+ */
+
+static struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp)
+{
+ u64 blkno = gfs2_log_bmap(sdp, sdp->sd_log_flush_head);
+ struct buffer_head *bh;
+
+ bh = sb_getblk(sdp->sd_vfs, blkno);
+ lock_buffer(bh);
+ memset(bh->b_data, 0, bh->b_size);
+ set_buffer_uptodate(bh);
+ clear_buffer_dirty(bh);
+ gfs2_log_incr_head(sdp);
+ atomic_inc(&sdp->sd_log_in_flight);
+ bh->b_private = sdp;
+ bh->b_end_io = gfs2_log_write_endio;
+
+ return bh;
+}
+
+/**
+ * gfs2_fake_write_endio -
+ * @bh: The buffer head
+ * @uptodate: The I/O Status
+ *
+ */
+
+static void gfs2_fake_write_endio(struct buffer_head *bh, int uptodate)
+{
+ struct buffer_head *real_bh = bh->b_private;
+ struct gfs2_bufdata *bd = real_bh->b_private;
+ struct gfs2_sbd *sdp = bd->bd_gl->gl_sbd;
+
+ end_buffer_write_sync(bh, uptodate);
+ mempool_free(bh, gfs2_bh_pool);
+ unlock_buffer(real_bh);
+ brelse(real_bh);
+ if (atomic_dec_and_test(&sdp->sd_log_in_flight))
+ wake_up(&sdp->sd_log_flush_wait);
+}
+
+/**
+ * gfs2_log_fake_buf - Build a fake buffer head to write metadata buffer to log
+ * @sdp: the filesystem
+ * @data: the data the buffer_head should point to
+ *
+ * Returns: the log buffer descriptor
+ */
+
+static struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp,
+ struct buffer_head *real)
+{
+ u64 blkno = gfs2_log_bmap(sdp, sdp->sd_log_flush_head);
+ struct buffer_head *bh;
+
+ bh = mempool_alloc(gfs2_bh_pool, GFP_NOFS);
+ atomic_set(&bh->b_count, 1);
+ bh->b_state = (1 << BH_Mapped) | (1 << BH_Uptodate) | (1 << BH_Lock);
+ set_bh_page(bh, real->b_page, bh_offset(real));
+ bh->b_blocknr = blkno;
+ bh->b_size = sdp->sd_sb.sb_bsize;
+ bh->b_bdev = sdp->sd_vfs->s_bdev;
+ bh->b_private = real;
+ bh->b_end_io = gfs2_fake_write_endio;
+
+ gfs2_log_incr_head(sdp);
+ atomic_inc(&sdp->sd_log_in_flight);
+
+ return bh;
+}
+
+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;
+
+ if (!list_empty(&bd->bd_list_tr))
+ return;
+ 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))
+ return;
+ 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++;
+}
+
+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);
+
+ if (tr) {
+ if (!list_empty(&bd->bd_list_tr))
+ return;
+ 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))
+ return;
+
+ 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);
+ }
+}
+
+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_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);
+ memcpy(bh1->b_data, kaddr + bh_offset(bd->bd_bh),
+ bh1->b_size);
+ kunmap_atomic(kaddr);
+ *(__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,
+};
+