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_ail1_list); 71 INIT_LIST_HEAD(&tr->tr_ail2_list); 72 73 sb_start_intwrite(sdp->sd_vfs); 74 75 error = gfs2_log_reserve(sdp, tr->tr_reserved); 76 if (error) 77 goto fail; 78 79 current->journal_info = tr; 80 81 return 0; 82 83 fail: 84 sb_end_intwrite(sdp->sd_vfs); 85 kmem_cache_free(gfs2_trans_cachep, tr); 86 87 return error; 88 } 89 90 void gfs2_trans_end(struct gfs2_sbd *sdp) 91 { 92 struct gfs2_trans *tr = current->journal_info; 93 s64 nbuf; 94 int alloced = test_bit(TR_ALLOCED, &tr->tr_flags); 95 96 current->journal_info = NULL; 97 98 if (!test_bit(TR_TOUCHED, &tr->tr_flags)) { 99 gfs2_log_release(sdp, tr->tr_reserved); 100 if (alloced) { 101 gfs2_trans_free(sdp, tr); 102 sb_end_intwrite(sdp->sd_vfs); 103 } 104 return; 105 } 106 107 nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new; 108 nbuf -= tr->tr_num_buf_rm; 109 nbuf -= tr->tr_num_databuf_rm; 110 111 if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) && 112 (tr->tr_num_revoke <= tr->tr_revokes))) 113 gfs2_print_trans(sdp, tr); 114 115 gfs2_log_commit(sdp, tr); 116 if (alloced && !test_bit(TR_ATTACHED, &tr->tr_flags)) 117 gfs2_trans_free(sdp, tr); 118 up_read(&sdp->sd_log_flush_lock); 119 120 if (sdp->sd_vfs->s_flags & SB_SYNCHRONOUS) 121 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL | 122 GFS2_LFC_TRANS_END); 123 if (alloced) 124 sb_end_intwrite(sdp->sd_vfs); 125 } 126 127 static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl, 128 struct buffer_head *bh) 129 { 130 struct gfs2_bufdata *bd; 131 132 bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL); 133 bd->bd_bh = bh; 134 bd->bd_gl = gl; 135 INIT_LIST_HEAD(&bd->bd_list); 136 bh->b_private = bd; 137 return bd; 138 } 139 140 /** 141 * gfs2_trans_add_data - Add a databuf to the transaction. 142 * @gl: The inode glock associated with the buffer 143 * @bh: The buffer to add 144 * 145 * This is used in journaled data mode. 146 * We need to journal the data block in the same way as metadata in 147 * the functions above. The difference is that here we have a tag 148 * which is two __be64's being the block number (as per meta data) 149 * and a flag which says whether the data block needs escaping or 150 * not. This means we need a new log entry for each 251 or so data 151 * blocks, which isn't an enormous overhead but twice as much as 152 * for normal metadata blocks. 153 */ 154 void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh) 155 { 156 struct gfs2_trans *tr = current->journal_info; 157 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; 158 struct gfs2_bufdata *bd; 159 160 lock_buffer(bh); 161 if (buffer_pinned(bh)) { 162 set_bit(TR_TOUCHED, &tr->tr_flags); 163 goto out; 164 } 165 gfs2_log_lock(sdp); 166 bd = bh->b_private; 167 if (bd == NULL) { 168 gfs2_log_unlock(sdp); 169 unlock_buffer(bh); 170 if (bh->b_private == NULL) 171 bd = gfs2_alloc_bufdata(gl, bh); 172 else 173 bd = bh->b_private; 174 lock_buffer(bh); 175 gfs2_log_lock(sdp); 176 } 177 gfs2_assert(sdp, bd->bd_gl == gl); 178 set_bit(TR_TOUCHED, &tr->tr_flags); 179 if (list_empty(&bd->bd_list)) { 180 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); 181 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags); 182 gfs2_pin(sdp, bd->bd_bh); 183 tr->tr_num_databuf_new++; 184 list_add_tail(&bd->bd_list, &tr->tr_databuf); 185 } 186 gfs2_log_unlock(sdp); 187 out: 188 unlock_buffer(bh); 189 } 190 191 void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh) 192 { 193 194 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; 195 struct gfs2_bufdata *bd; 196 struct gfs2_meta_header *mh; 197 struct gfs2_trans *tr = current->journal_info; 198 enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state); 199 200 lock_buffer(bh); 201 if (buffer_pinned(bh)) { 202 set_bit(TR_TOUCHED, &tr->tr_flags); 203 goto out; 204 } 205 gfs2_log_lock(sdp); 206 bd = bh->b_private; 207 if (bd == NULL) { 208 gfs2_log_unlock(sdp); 209 unlock_buffer(bh); 210 lock_page(bh->b_page); 211 if (bh->b_private == NULL) 212 bd = gfs2_alloc_bufdata(gl, bh); 213 else 214 bd = bh->b_private; 215 unlock_page(bh->b_page); 216 lock_buffer(bh); 217 gfs2_log_lock(sdp); 218 } 219 gfs2_assert(sdp, bd->bd_gl == gl); 220 set_bit(TR_TOUCHED, &tr->tr_flags); 221 if (!list_empty(&bd->bd_list)) 222 goto out_unlock; 223 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); 224 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags); 225 mh = (struct gfs2_meta_header *)bd->bd_bh->b_data; 226 if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) { 227 fs_err(sdp, "Attempting to add uninitialised block to " 228 "journal (inplace block=%lld)\n", 229 (unsigned long long)bd->bd_bh->b_blocknr); 230 BUG(); 231 } 232 if (unlikely(state == SFS_FROZEN)) { 233 fs_info(sdp, "GFS2:adding buf while frozen\n"); 234 gfs2_assert_withdraw(sdp, 0); 235 } 236 if (unlikely(gfs2_withdrawn(sdp))) { 237 fs_info(sdp, "GFS2:adding buf while withdrawn! 0x%llx\n", 238 (unsigned long long)bd->bd_bh->b_blocknr); 239 } 240 gfs2_pin(sdp, bd->bd_bh); 241 mh->__pad0 = cpu_to_be64(0); 242 mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid); 243 list_add(&bd->bd_list, &tr->tr_buf); 244 tr->tr_num_buf_new++; 245 out_unlock: 246 gfs2_log_unlock(sdp); 247 out: 248 unlock_buffer(bh); 249 } 250 251 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) 252 { 253 struct gfs2_trans *tr = current->journal_info; 254 255 BUG_ON(!list_empty(&bd->bd_list)); 256 gfs2_add_revoke(sdp, bd); 257 set_bit(TR_TOUCHED, &tr->tr_flags); 258 tr->tr_num_revoke++; 259 } 260 261 void gfs2_trans_remove_revoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len) 262 { 263 struct gfs2_bufdata *bd, *tmp; 264 struct gfs2_trans *tr = current->journal_info; 265 unsigned int n = len; 266 267 gfs2_log_lock(sdp); 268 list_for_each_entry_safe(bd, tmp, &sdp->sd_log_revokes, bd_list) { 269 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) { 270 list_del_init(&bd->bd_list); 271 gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke); 272 sdp->sd_log_num_revoke--; 273 if (bd->bd_gl) 274 gfs2_glock_remove_revoke(bd->bd_gl); 275 kmem_cache_free(gfs2_bufdata_cachep, bd); 276 tr->tr_num_revoke_rm++; 277 if (--n == 0) 278 break; 279 } 280 } 281 gfs2_log_unlock(sdp); 282 } 283 284 void gfs2_trans_free(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 285 { 286 if (tr == NULL) 287 return; 288 289 gfs2_assert_warn(sdp, list_empty(&tr->tr_ail1_list)); 290 gfs2_assert_warn(sdp, list_empty(&tr->tr_ail2_list)); 291 gfs2_assert_warn(sdp, list_empty(&tr->tr_databuf)); 292 gfs2_assert_warn(sdp, list_empty(&tr->tr_buf)); 293 kmem_cache_free(gfs2_trans_cachep, tr); 294 } 295