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-rw-r--r--fs/gfs2/trans.c331
1 files changed, 331 insertions, 0 deletions
diff --git a/fs/gfs2/trans.c b/fs/gfs2/trans.c
new file mode 100644
index 000000000..63fec11ef
--- /dev/null
+++ b/fs/gfs2/trans.c
@@ -0,0 +1,331 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+ * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <linux/kallsyms.h>
+#include <linux/gfs2_ondisk.h>
+
+#include "gfs2.h"
+#include "incore.h"
+#include "glock.h"
+#include "inode.h"
+#include "log.h"
+#include "lops.h"
+#include "meta_io.h"
+#include "trans.h"
+#include "util.h"
+#include "trace_gfs2.h"
+
+static void gfs2_print_trans(struct gfs2_sbd *sdp, const struct gfs2_trans *tr)
+{
+ fs_warn(sdp, "Transaction created at: %pSR\n", (void *)tr->tr_ip);
+ fs_warn(sdp, "blocks=%u revokes=%u reserved=%u touched=%u\n",
+ tr->tr_blocks, tr->tr_revokes, tr->tr_reserved,
+ test_bit(TR_TOUCHED, &tr->tr_flags));
+ fs_warn(sdp, "Buf %u/%u Databuf %u/%u Revoke %u\n",
+ tr->tr_num_buf_new, tr->tr_num_buf_rm,
+ tr->tr_num_databuf_new, tr->tr_num_databuf_rm,
+ tr->tr_num_revoke);
+}
+
+int __gfs2_trans_begin(struct gfs2_trans *tr, struct gfs2_sbd *sdp,
+ unsigned int blocks, unsigned int revokes,
+ unsigned long ip)
+{
+ unsigned int extra_revokes;
+
+ if (current->journal_info) {
+ gfs2_print_trans(sdp, current->journal_info);
+ BUG();
+ }
+ BUG_ON(blocks == 0 && revokes == 0);
+
+ if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
+ return -EROFS;
+
+ tr->tr_ip = ip;
+ tr->tr_blocks = blocks;
+ tr->tr_revokes = revokes;
+ tr->tr_reserved = GFS2_LOG_FLUSH_MIN_BLOCKS;
+ if (blocks) {
+ /*
+ * The reserved blocks are either used for data or metadata.
+ * We can have mixed data and metadata, each with its own log
+ * descriptor block; see calc_reserved().
+ */
+ tr->tr_reserved += blocks + 1 + DIV_ROUND_UP(blocks - 1, databuf_limit(sdp));
+ }
+ INIT_LIST_HEAD(&tr->tr_databuf);
+ INIT_LIST_HEAD(&tr->tr_buf);
+ INIT_LIST_HEAD(&tr->tr_list);
+ INIT_LIST_HEAD(&tr->tr_ail1_list);
+ INIT_LIST_HEAD(&tr->tr_ail2_list);
+
+ if (gfs2_assert_warn(sdp, tr->tr_reserved <= sdp->sd_jdesc->jd_blocks))
+ return -EINVAL;
+
+ sb_start_intwrite(sdp->sd_vfs);
+
+ /*
+ * Try the reservations under sd_log_flush_lock to prevent log flushes
+ * from creating inconsistencies between the number of allocated and
+ * reserved revokes. If that fails, do a full-block allocation outside
+ * of the lock to avoid stalling log flushes. Then, allot the
+ * appropriate number of blocks to revokes, use as many revokes locally
+ * as needed, and "release" the surplus into the revokes pool.
+ */
+
+ down_read(&sdp->sd_log_flush_lock);
+ if (gfs2_log_try_reserve(sdp, tr, &extra_revokes))
+ goto reserved;
+ up_read(&sdp->sd_log_flush_lock);
+ gfs2_log_reserve(sdp, tr, &extra_revokes);
+ down_read(&sdp->sd_log_flush_lock);
+
+reserved:
+ gfs2_log_release_revokes(sdp, extra_revokes);
+ if (unlikely(!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))) {
+ gfs2_log_release_revokes(sdp, tr->tr_revokes);
+ up_read(&sdp->sd_log_flush_lock);
+ gfs2_log_release(sdp, tr->tr_reserved);
+ sb_end_intwrite(sdp->sd_vfs);
+ return -EROFS;
+ }
+
+ current->journal_info = tr;
+
+ return 0;
+}
+
+int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
+ unsigned int revokes)
+{
+ struct gfs2_trans *tr;
+ int error;
+
+ tr = kmem_cache_zalloc(gfs2_trans_cachep, GFP_NOFS);
+ if (!tr)
+ return -ENOMEM;
+ error = __gfs2_trans_begin(tr, sdp, blocks, revokes, _RET_IP_);
+ if (error)
+ kmem_cache_free(gfs2_trans_cachep, tr);
+ return error;
+}
+
+void gfs2_trans_end(struct gfs2_sbd *sdp)
+{
+ struct gfs2_trans *tr = current->journal_info;
+ s64 nbuf;
+
+ current->journal_info = NULL;
+
+ if (!test_bit(TR_TOUCHED, &tr->tr_flags)) {
+ gfs2_log_release_revokes(sdp, tr->tr_revokes);
+ up_read(&sdp->sd_log_flush_lock);
+ gfs2_log_release(sdp, tr->tr_reserved);
+ if (!test_bit(TR_ONSTACK, &tr->tr_flags))
+ gfs2_trans_free(sdp, tr);
+ sb_end_intwrite(sdp->sd_vfs);
+ return;
+ }
+
+ gfs2_log_release_revokes(sdp, tr->tr_revokes - tr->tr_num_revoke);
+
+ nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new;
+ nbuf -= tr->tr_num_buf_rm;
+ nbuf -= tr->tr_num_databuf_rm;
+
+ if (gfs2_assert_withdraw(sdp, nbuf <= tr->tr_blocks) ||
+ gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes))
+ gfs2_print_trans(sdp, tr);
+
+ gfs2_log_commit(sdp, tr);
+ if (!test_bit(TR_ONSTACK, &tr->tr_flags) &&
+ !test_bit(TR_ATTACHED, &tr->tr_flags))
+ gfs2_trans_free(sdp, tr);
+ up_read(&sdp->sd_log_flush_lock);
+
+ if (sdp->sd_vfs->s_flags & SB_SYNCHRONOUS)
+ gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
+ GFS2_LFC_TRANS_END);
+ sb_end_intwrite(sdp->sd_vfs);
+}
+
+static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl,
+ struct buffer_head *bh)
+{
+ struct gfs2_bufdata *bd;
+
+ bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL);
+ bd->bd_bh = bh;
+ bd->bd_gl = gl;
+ INIT_LIST_HEAD(&bd->bd_list);
+ INIT_LIST_HEAD(&bd->bd_ail_st_list);
+ INIT_LIST_HEAD(&bd->bd_ail_gl_list);
+ bh->b_private = bd;
+ return bd;
+}
+
+/**
+ * gfs2_trans_add_data - Add a databuf to the transaction.
+ * @gl: The inode glock associated with the buffer
+ * @bh: The buffer to add
+ *
+ * This is used 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.
+ */
+void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh)
+{
+ struct gfs2_trans *tr = current->journal_info;
+ struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
+ struct gfs2_bufdata *bd;
+
+ lock_buffer(bh);
+ if (buffer_pinned(bh)) {
+ set_bit(TR_TOUCHED, &tr->tr_flags);
+ goto out;
+ }
+ gfs2_log_lock(sdp);
+ bd = bh->b_private;
+ if (bd == NULL) {
+ gfs2_log_unlock(sdp);
+ unlock_buffer(bh);
+ if (bh->b_private == NULL)
+ bd = gfs2_alloc_bufdata(gl, bh);
+ else
+ bd = bh->b_private;
+ lock_buffer(bh);
+ gfs2_log_lock(sdp);
+ }
+ gfs2_assert(sdp, bd->bd_gl == gl);
+ set_bit(TR_TOUCHED, &tr->tr_flags);
+ if (list_empty(&bd->bd_list)) {
+ set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
+ set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
+ gfs2_pin(sdp, bd->bd_bh);
+ tr->tr_num_databuf_new++;
+ list_add_tail(&bd->bd_list, &tr->tr_databuf);
+ }
+ gfs2_log_unlock(sdp);
+out:
+ unlock_buffer(bh);
+}
+
+void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
+{
+
+ struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
+ struct gfs2_bufdata *bd;
+ struct gfs2_meta_header *mh;
+ struct gfs2_trans *tr = current->journal_info;
+ enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
+
+ lock_buffer(bh);
+ if (buffer_pinned(bh)) {
+ set_bit(TR_TOUCHED, &tr->tr_flags);
+ goto out;
+ }
+ gfs2_log_lock(sdp);
+ bd = bh->b_private;
+ if (bd == NULL) {
+ gfs2_log_unlock(sdp);
+ unlock_buffer(bh);
+ lock_page(bh->b_page);
+ if (bh->b_private == NULL)
+ bd = gfs2_alloc_bufdata(gl, bh);
+ else
+ bd = bh->b_private;
+ unlock_page(bh->b_page);
+ lock_buffer(bh);
+ gfs2_log_lock(sdp);
+ }
+ gfs2_assert(sdp, bd->bd_gl == gl);
+ set_bit(TR_TOUCHED, &tr->tr_flags);
+ if (!list_empty(&bd->bd_list))
+ goto out_unlock;
+ set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
+ set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
+ mh = (struct gfs2_meta_header *)bd->bd_bh->b_data;
+ if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) {
+ fs_err(sdp, "Attempting to add uninitialised block to "
+ "journal (inplace block=%lld)\n",
+ (unsigned long long)bd->bd_bh->b_blocknr);
+ BUG();
+ }
+ if (unlikely(state == SFS_FROZEN)) {
+ fs_info(sdp, "GFS2:adding buf while frozen\n");
+ gfs2_assert_withdraw(sdp, 0);
+ }
+ if (unlikely(gfs2_withdrawn(sdp))) {
+ fs_info(sdp, "GFS2:adding buf while withdrawn! 0x%llx\n",
+ (unsigned long long)bd->bd_bh->b_blocknr);
+ }
+ gfs2_pin(sdp, bd->bd_bh);
+ mh->__pad0 = cpu_to_be64(0);
+ mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
+ list_add(&bd->bd_list, &tr->tr_buf);
+ tr->tr_num_buf_new++;
+out_unlock:
+ gfs2_log_unlock(sdp);
+out:
+ unlock_buffer(bh);
+}
+
+void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
+{
+ struct gfs2_trans *tr = current->journal_info;
+
+ BUG_ON(!list_empty(&bd->bd_list));
+ gfs2_add_revoke(sdp, bd);
+ set_bit(TR_TOUCHED, &tr->tr_flags);
+ tr->tr_num_revoke++;
+}
+
+void gfs2_trans_remove_revoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
+{
+ struct gfs2_bufdata *bd, *tmp;
+ unsigned int n = len;
+
+ gfs2_log_lock(sdp);
+ list_for_each_entry_safe(bd, tmp, &sdp->sd_log_revokes, bd_list) {
+ if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
+ list_del_init(&bd->bd_list);
+ gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
+ sdp->sd_log_num_revoke--;
+ if (bd->bd_gl)
+ gfs2_glock_remove_revoke(bd->bd_gl);
+ kmem_cache_free(gfs2_bufdata_cachep, bd);
+ gfs2_log_release_revokes(sdp, 1);
+ if (--n == 0)
+ break;
+ }
+ }
+ gfs2_log_unlock(sdp);
+}
+
+void gfs2_trans_free(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
+{
+ if (tr == NULL)
+ return;
+
+ gfs2_assert_warn(sdp, list_empty(&tr->tr_ail1_list));
+ gfs2_assert_warn(sdp, list_empty(&tr->tr_ail2_list));
+ gfs2_assert_warn(sdp, list_empty(&tr->tr_databuf));
+ gfs2_assert_warn(sdp, list_empty(&tr->tr_buf));
+ kmem_cache_free(gfs2_trans_cachep, tr);
+}