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 static void gfs2_print_trans(struct gfs2_sbd *sdp, const struct gfs2_trans *tr) 29 { 30 fs_warn(sdp, "Transaction created at: %pSR\n", (void *)tr->tr_ip); 31 fs_warn(sdp, "blocks=%u revokes=%u reserved=%u touched=%u\n", 32 tr->tr_blocks, tr->tr_revokes, tr->tr_reserved, 33 test_bit(TR_TOUCHED, &tr->tr_flags)); 34 fs_warn(sdp, "Buf %u/%u Databuf %u/%u Revoke %u/%u\n", 35 tr->tr_num_buf_new, tr->tr_num_buf_rm, 36 tr->tr_num_databuf_new, tr->tr_num_databuf_rm, 37 tr->tr_num_revoke, tr->tr_num_revoke_rm); 38 } 39 40 int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks, 41 unsigned int revokes) 42 { 43 struct gfs2_trans *tr; 44 int error; 45 46 if (current->journal_info) { 47 gfs2_print_trans(sdp, current->journal_info); 48 BUG(); 49 } 50 BUG_ON(blocks == 0 && revokes == 0); 51 52 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) 53 return -EROFS; 54 55 tr = kmem_cache_zalloc(gfs2_trans_cachep, GFP_NOFS); 56 if (!tr) 57 return -ENOMEM; 58 59 tr->tr_ip = _RET_IP_; 60 tr->tr_blocks = blocks; 61 tr->tr_revokes = revokes; 62 tr->tr_reserved = 1; 63 set_bit(TR_ALLOCED, &tr->tr_flags); 64 if (blocks) 65 tr->tr_reserved += 6 + blocks; 66 if (revokes) 67 tr->tr_reserved += gfs2_struct2blk(sdp, revokes); 68 INIT_LIST_HEAD(&tr->tr_databuf); 69 INIT_LIST_HEAD(&tr->tr_buf); 70 INIT_LIST_HEAD(&tr->tr_list); 71 INIT_LIST_HEAD(&tr->tr_ail1_list); 72 INIT_LIST_HEAD(&tr->tr_ail2_list); 73 74 sb_start_intwrite(sdp->sd_vfs); 75 76 error = gfs2_log_reserve(sdp, tr->tr_reserved); 77 if (error) 78 goto fail; 79 80 current->journal_info = tr; 81 82 return 0; 83 84 fail: 85 sb_end_intwrite(sdp->sd_vfs); 86 kmem_cache_free(gfs2_trans_cachep, tr); 87 88 return error; 89 } 90 91 void gfs2_trans_end(struct gfs2_sbd *sdp) 92 { 93 struct gfs2_trans *tr = current->journal_info; 94 s64 nbuf; 95 int alloced = test_bit(TR_ALLOCED, &tr->tr_flags); 96 97 current->journal_info = NULL; 98 99 if (!test_bit(TR_TOUCHED, &tr->tr_flags)) { 100 gfs2_log_release(sdp, tr->tr_reserved); 101 if (alloced) { 102 gfs2_trans_free(sdp, tr); 103 sb_end_intwrite(sdp->sd_vfs); 104 } 105 return; 106 } 107 108 nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new; 109 nbuf -= tr->tr_num_buf_rm; 110 nbuf -= tr->tr_num_databuf_rm; 111 112 if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) && 113 (tr->tr_num_revoke <= tr->tr_revokes))) 114 gfs2_print_trans(sdp, tr); 115 116 gfs2_log_commit(sdp, tr); 117 if (alloced && !test_bit(TR_ATTACHED, &tr->tr_flags)) 118 gfs2_trans_free(sdp, tr); 119 up_read(&sdp->sd_log_flush_lock); 120 121 if (sdp->sd_vfs->s_flags & SB_SYNCHRONOUS) 122 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL | 123 GFS2_LFC_TRANS_END); 124 if (alloced) 125 sb_end_intwrite(sdp->sd_vfs); 126 } 127 128 static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl, 129 struct buffer_head *bh) 130 { 131 struct gfs2_bufdata *bd; 132 133 bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL); 134 bd->bd_bh = bh; 135 bd->bd_gl = gl; 136 INIT_LIST_HEAD(&bd->bd_list); 137 bh->b_private = bd; 138 return bd; 139 } 140 141 /** 142 * gfs2_trans_add_data - Add a databuf to the transaction. 143 * @gl: The inode glock associated with the buffer 144 * @bh: The buffer to add 145 * 146 * This is used in journaled data mode. 147 * We need to journal the data block in the same way as metadata in 148 * the functions above. The difference is that here we have a tag 149 * which is two __be64's being the block number (as per meta data) 150 * and a flag which says whether the data block needs escaping or 151 * not. This means we need a new log entry for each 251 or so data 152 * blocks, which isn't an enormous overhead but twice as much as 153 * for normal metadata blocks. 154 */ 155 void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh) 156 { 157 struct gfs2_trans *tr = current->journal_info; 158 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; 159 struct gfs2_bufdata *bd; 160 161 lock_buffer(bh); 162 if (buffer_pinned(bh)) { 163 set_bit(TR_TOUCHED, &tr->tr_flags); 164 goto out; 165 } 166 gfs2_log_lock(sdp); 167 bd = bh->b_private; 168 if (bd == NULL) { 169 gfs2_log_unlock(sdp); 170 unlock_buffer(bh); 171 if (bh->b_private == NULL) 172 bd = gfs2_alloc_bufdata(gl, bh); 173 else 174 bd = bh->b_private; 175 lock_buffer(bh); 176 gfs2_log_lock(sdp); 177 } 178 gfs2_assert(sdp, bd->bd_gl == gl); 179 set_bit(TR_TOUCHED, &tr->tr_flags); 180 if (list_empty(&bd->bd_list)) { 181 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); 182 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags); 183 gfs2_pin(sdp, bd->bd_bh); 184 tr->tr_num_databuf_new++; 185 list_add_tail(&bd->bd_list, &tr->tr_databuf); 186 } 187 gfs2_log_unlock(sdp); 188 out: 189 unlock_buffer(bh); 190 } 191 192 void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh) 193 { 194 195 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; 196 struct gfs2_bufdata *bd; 197 struct gfs2_meta_header *mh; 198 struct gfs2_trans *tr = current->journal_info; 199 enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state); 200 201 lock_buffer(bh); 202 if (buffer_pinned(bh)) { 203 set_bit(TR_TOUCHED, &tr->tr_flags); 204 goto out; 205 } 206 gfs2_log_lock(sdp); 207 bd = bh->b_private; 208 if (bd == NULL) { 209 gfs2_log_unlock(sdp); 210 unlock_buffer(bh); 211 lock_page(bh->b_page); 212 if (bh->b_private == NULL) 213 bd = gfs2_alloc_bufdata(gl, bh); 214 else 215 bd = bh->b_private; 216 unlock_page(bh->b_page); 217 lock_buffer(bh); 218 gfs2_log_lock(sdp); 219 } 220 gfs2_assert(sdp, bd->bd_gl == gl); 221 set_bit(TR_TOUCHED, &tr->tr_flags); 222 if (!list_empty(&bd->bd_list)) 223 goto out_unlock; 224 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); 225 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags); 226 mh = (struct gfs2_meta_header *)bd->bd_bh->b_data; 227 if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) { 228 fs_err(sdp, "Attempting to add uninitialised block to " 229 "journal (inplace block=%lld)\n", 230 (unsigned long long)bd->bd_bh->b_blocknr); 231 BUG(); 232 } 233 if (unlikely(state == SFS_FROZEN)) { 234 fs_info(sdp, "GFS2:adding buf while frozen\n"); 235 gfs2_assert_withdraw(sdp, 0); 236 } 237 if (unlikely(gfs2_withdrawn(sdp))) { 238 fs_info(sdp, "GFS2:adding buf while withdrawn! 0x%llx\n", 239 (unsigned long long)bd->bd_bh->b_blocknr); 240 } 241 gfs2_pin(sdp, bd->bd_bh); 242 mh->__pad0 = cpu_to_be64(0); 243 mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid); 244 list_add(&bd->bd_list, &tr->tr_buf); 245 tr->tr_num_buf_new++; 246 out_unlock: 247 gfs2_log_unlock(sdp); 248 out: 249 unlock_buffer(bh); 250 } 251 252 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) 253 { 254 struct gfs2_trans *tr = current->journal_info; 255 256 BUG_ON(!list_empty(&bd->bd_list)); 257 gfs2_add_revoke(sdp, bd); 258 set_bit(TR_TOUCHED, &tr->tr_flags); 259 tr->tr_num_revoke++; 260 } 261 262 void gfs2_trans_remove_revoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len) 263 { 264 struct gfs2_bufdata *bd, *tmp; 265 struct gfs2_trans *tr = current->journal_info; 266 unsigned int n = len; 267 268 gfs2_log_lock(sdp); 269 list_for_each_entry_safe(bd, tmp, &sdp->sd_log_revokes, bd_list) { 270 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) { 271 list_del_init(&bd->bd_list); 272 gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke); 273 sdp->sd_log_num_revoke--; 274 if (bd->bd_gl) 275 gfs2_glock_remove_revoke(bd->bd_gl); 276 kmem_cache_free(gfs2_bufdata_cachep, bd); 277 tr->tr_num_revoke_rm++; 278 if (--n == 0) 279 break; 280 } 281 } 282 gfs2_log_unlock(sdp); 283 } 284 285 void gfs2_trans_free(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 286 { 287 if (tr == NULL) 288 return; 289 290 gfs2_assert_warn(sdp, list_empty(&tr->tr_ail1_list)); 291 gfs2_assert_warn(sdp, list_empty(&tr->tr_ail2_list)); 292 gfs2_assert_warn(sdp, list_empty(&tr->tr_databuf)); 293 gfs2_assert_warn(sdp, list_empty(&tr->tr_buf)); 294 kmem_cache_free(gfs2_trans_cachep, tr); 295 } 296