1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 5 */ 6 7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 8 9 #include <linux/sched.h> 10 #include <linux/slab.h> 11 #include <linux/spinlock.h> 12 #include <linux/completion.h> 13 #include <linux/buffer_head.h> 14 #include <linux/kallsyms.h> 15 #include <linux/gfs2_ondisk.h> 16 17 #include "gfs2.h" 18 #include "incore.h" 19 #include "glock.h" 20 #include "inode.h" 21 #include "log.h" 22 #include "lops.h" 23 #include "meta_io.h" 24 #include "trans.h" 25 #include "util.h" 26 #include "trace_gfs2.h" 27 28 int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks, 29 unsigned int revokes) 30 { 31 struct gfs2_trans *tr; 32 int error; 33 34 BUG_ON(current->journal_info); 35 BUG_ON(blocks == 0 && revokes == 0); 36 37 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) 38 return -EROFS; 39 40 tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS); 41 if (!tr) 42 return -ENOMEM; 43 44 tr->tr_ip = _RET_IP_; 45 tr->tr_blocks = blocks; 46 tr->tr_revokes = revokes; 47 tr->tr_reserved = 1; 48 set_bit(TR_ALLOCED, &tr->tr_flags); 49 if (blocks) 50 tr->tr_reserved += 6 + blocks; 51 if (revokes) 52 tr->tr_reserved += gfs2_struct2blk(sdp, revokes); 53 INIT_LIST_HEAD(&tr->tr_databuf); 54 INIT_LIST_HEAD(&tr->tr_buf); 55 56 sb_start_intwrite(sdp->sd_vfs); 57 58 error = gfs2_log_reserve(sdp, tr->tr_reserved); 59 if (error) 60 goto fail; 61 62 current->journal_info = tr; 63 64 return 0; 65 66 fail: 67 sb_end_intwrite(sdp->sd_vfs); 68 kfree(tr); 69 70 return error; 71 } 72 73 static void gfs2_print_trans(struct gfs2_sbd *sdp, const struct gfs2_trans *tr) 74 { 75 fs_warn(sdp, "Transaction created at: %pSR\n", (void *)tr->tr_ip); 76 fs_warn(sdp, "blocks=%u revokes=%u reserved=%u touched=%u\n", 77 tr->tr_blocks, tr->tr_revokes, tr->tr_reserved, 78 test_bit(TR_TOUCHED, &tr->tr_flags)); 79 fs_warn(sdp, "Buf %u/%u Databuf %u/%u Revoke %u/%u\n", 80 tr->tr_num_buf_new, tr->tr_num_buf_rm, 81 tr->tr_num_databuf_new, tr->tr_num_databuf_rm, 82 tr->tr_num_revoke, tr->tr_num_revoke_rm); 83 } 84 85 void gfs2_trans_end(struct gfs2_sbd *sdp) 86 { 87 struct gfs2_trans *tr = current->journal_info; 88 s64 nbuf; 89 int alloced = test_bit(TR_ALLOCED, &tr->tr_flags); 90 91 current->journal_info = NULL; 92 93 if (!test_bit(TR_TOUCHED, &tr->tr_flags)) { 94 gfs2_log_release(sdp, tr->tr_reserved); 95 if (alloced) { 96 kfree(tr); 97 sb_end_intwrite(sdp->sd_vfs); 98 } 99 return; 100 } 101 102 nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new; 103 nbuf -= tr->tr_num_buf_rm; 104 nbuf -= tr->tr_num_databuf_rm; 105 106 if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) && 107 (tr->tr_num_revoke <= tr->tr_revokes))) 108 gfs2_print_trans(sdp, tr); 109 110 gfs2_log_commit(sdp, tr); 111 if (alloced && !test_bit(TR_ATTACHED, &tr->tr_flags)) 112 kfree(tr); 113 up_read(&sdp->sd_log_flush_lock); 114 115 if (sdp->sd_vfs->s_flags & SB_SYNCHRONOUS) 116 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL | 117 GFS2_LFC_TRANS_END); 118 if (alloced) 119 sb_end_intwrite(sdp->sd_vfs); 120 } 121 122 static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl, 123 struct buffer_head *bh) 124 { 125 struct gfs2_bufdata *bd; 126 127 bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL); 128 bd->bd_bh = bh; 129 bd->bd_gl = gl; 130 INIT_LIST_HEAD(&bd->bd_list); 131 bh->b_private = bd; 132 return bd; 133 } 134 135 /** 136 * gfs2_trans_add_data - Add a databuf to the transaction. 137 * @gl: The inode glock associated with the buffer 138 * @bh: The buffer to add 139 * 140 * This is used in journaled data mode. 141 * We need to journal the data block in the same way as metadata in 142 * the functions above. The difference is that here we have a tag 143 * which is two __be64's being the block number (as per meta data) 144 * and a flag which says whether the data block needs escaping or 145 * not. This means we need a new log entry for each 251 or so data 146 * blocks, which isn't an enormous overhead but twice as much as 147 * for normal metadata blocks. 148 */ 149 void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh) 150 { 151 struct gfs2_trans *tr = current->journal_info; 152 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; 153 struct gfs2_bufdata *bd; 154 155 lock_buffer(bh); 156 if (buffer_pinned(bh)) { 157 set_bit(TR_TOUCHED, &tr->tr_flags); 158 goto out; 159 } 160 gfs2_log_lock(sdp); 161 bd = bh->b_private; 162 if (bd == NULL) { 163 gfs2_log_unlock(sdp); 164 unlock_buffer(bh); 165 if (bh->b_private == NULL) 166 bd = gfs2_alloc_bufdata(gl, bh); 167 else 168 bd = bh->b_private; 169 lock_buffer(bh); 170 gfs2_log_lock(sdp); 171 } 172 gfs2_assert(sdp, bd->bd_gl == gl); 173 set_bit(TR_TOUCHED, &tr->tr_flags); 174 if (list_empty(&bd->bd_list)) { 175 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); 176 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags); 177 gfs2_pin(sdp, bd->bd_bh); 178 tr->tr_num_databuf_new++; 179 list_add_tail(&bd->bd_list, &tr->tr_databuf); 180 } 181 gfs2_log_unlock(sdp); 182 out: 183 unlock_buffer(bh); 184 } 185 186 void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh) 187 { 188 189 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; 190 struct gfs2_bufdata *bd; 191 struct gfs2_meta_header *mh; 192 struct gfs2_trans *tr = current->journal_info; 193 enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state); 194 195 lock_buffer(bh); 196 if (buffer_pinned(bh)) { 197 set_bit(TR_TOUCHED, &tr->tr_flags); 198 goto out; 199 } 200 gfs2_log_lock(sdp); 201 bd = bh->b_private; 202 if (bd == NULL) { 203 gfs2_log_unlock(sdp); 204 unlock_buffer(bh); 205 lock_page(bh->b_page); 206 if (bh->b_private == NULL) 207 bd = gfs2_alloc_bufdata(gl, bh); 208 else 209 bd = bh->b_private; 210 unlock_page(bh->b_page); 211 lock_buffer(bh); 212 gfs2_log_lock(sdp); 213 } 214 gfs2_assert(sdp, bd->bd_gl == gl); 215 set_bit(TR_TOUCHED, &tr->tr_flags); 216 if (!list_empty(&bd->bd_list)) 217 goto out_unlock; 218 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); 219 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags); 220 mh = (struct gfs2_meta_header *)bd->bd_bh->b_data; 221 if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) { 222 fs_err(sdp, "Attempting to add uninitialised block to " 223 "journal (inplace block=%lld)\n", 224 (unsigned long long)bd->bd_bh->b_blocknr); 225 BUG(); 226 } 227 if (unlikely(state == SFS_FROZEN)) { 228 fs_info(sdp, "GFS2:adding buf while frozen\n"); 229 gfs2_assert_withdraw(sdp, 0); 230 } 231 gfs2_pin(sdp, bd->bd_bh); 232 mh->__pad0 = cpu_to_be64(0); 233 mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid); 234 list_add(&bd->bd_list, &tr->tr_buf); 235 tr->tr_num_buf_new++; 236 out_unlock: 237 gfs2_log_unlock(sdp); 238 out: 239 unlock_buffer(bh); 240 } 241 242 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) 243 { 244 struct gfs2_trans *tr = current->journal_info; 245 246 BUG_ON(!list_empty(&bd->bd_list)); 247 gfs2_add_revoke(sdp, bd); 248 set_bit(TR_TOUCHED, &tr->tr_flags); 249 tr->tr_num_revoke++; 250 } 251 252 void gfs2_trans_remove_revoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len) 253 { 254 struct gfs2_bufdata *bd, *tmp; 255 struct gfs2_trans *tr = current->journal_info; 256 unsigned int n = len; 257 258 gfs2_log_lock(sdp); 259 list_for_each_entry_safe(bd, tmp, &sdp->sd_log_revokes, bd_list) { 260 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) { 261 list_del_init(&bd->bd_list); 262 gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke); 263 sdp->sd_log_num_revoke--; 264 if (bd->bd_gl) 265 gfs2_glock_remove_revoke(bd->bd_gl); 266 kmem_cache_free(gfs2_bufdata_cachep, bd); 267 tr->tr_num_revoke_rm++; 268 if (--n == 0) 269 break; 270 } 271 } 272 gfs2_log_unlock(sdp); 273 } 274 275