| // 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" |
| |
| int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks, |
| unsigned int revokes) |
| { |
| struct gfs2_trans *tr; |
| int error; |
| |
| BUG_ON(current->journal_info); |
| BUG_ON(blocks == 0 && revokes == 0); |
| |
| if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) |
| return -EROFS; |
| |
| tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS); |
| if (!tr) |
| return -ENOMEM; |
| |
| tr->tr_ip = _RET_IP_; |
| tr->tr_blocks = blocks; |
| tr->tr_revokes = revokes; |
| tr->tr_reserved = 1; |
| set_bit(TR_ALLOCED, &tr->tr_flags); |
| if (blocks) |
| tr->tr_reserved += 6 + blocks; |
| if (revokes) |
| tr->tr_reserved += gfs2_struct2blk(sdp, revokes, |
| sizeof(u64)); |
| INIT_LIST_HEAD(&tr->tr_databuf); |
| INIT_LIST_HEAD(&tr->tr_buf); |
| |
| sb_start_intwrite(sdp->sd_vfs); |
| |
| error = gfs2_log_reserve(sdp, tr->tr_reserved); |
| if (error) |
| goto fail; |
| |
| current->journal_info = tr; |
| |
| return 0; |
| |
| fail: |
| sb_end_intwrite(sdp->sd_vfs); |
| kfree(tr); |
| |
| return error; |
| } |
| |
| 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/%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, tr->tr_num_revoke_rm); |
| } |
| |
| void gfs2_trans_end(struct gfs2_sbd *sdp) |
| { |
| struct gfs2_trans *tr = current->journal_info; |
| s64 nbuf; |
| int alloced = test_bit(TR_ALLOCED, &tr->tr_flags); |
| |
| current->journal_info = NULL; |
| |
| if (!test_bit(TR_TOUCHED, &tr->tr_flags)) { |
| gfs2_log_release(sdp, tr->tr_reserved); |
| if (alloced) { |
| kfree(tr); |
| sb_end_intwrite(sdp->sd_vfs); |
| } |
| return; |
| } |
| |
| 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) && |
| (tr->tr_num_revoke <= tr->tr_revokes))) |
| gfs2_print_trans(sdp, tr); |
| |
| gfs2_log_commit(sdp, tr); |
| if (alloced && !test_bit(TR_ATTACHED, &tr->tr_flags)) |
| kfree(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); |
| if (alloced) |
| 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); |
| 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); |
| } |
| 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; |
| struct gfs2_trans *tr = current->journal_info; |
| 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--; |
| kmem_cache_free(gfs2_bufdata_cachep, bd); |
| tr->tr_num_revoke_rm++; |
| if (--n == 0) |
| break; |
| } |
| } |
| gfs2_log_unlock(sdp); |
| } |
| |