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\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); 38 } 39 40 int __gfs2_trans_begin(struct gfs2_trans *tr, struct gfs2_sbd *sdp, 41 unsigned int blocks, unsigned int revokes, 42 unsigned long ip) 43 { 44 unsigned int extra_revokes; 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->tr_ip = ip; 56 tr->tr_blocks = blocks; 57 tr->tr_revokes = revokes; 58 tr->tr_reserved = GFS2_LOG_FLUSH_MIN_BLOCKS; 59 if (blocks) { 60 /* 61 * The reserved blocks are either used for data or metadata. 62 * We can have mixed data and metadata, each with its own log 63 * descriptor block; see calc_reserved(). 64 */ 65 tr->tr_reserved += blocks + 1 + DIV_ROUND_UP(blocks - 1, databuf_limit(sdp)); 66 } 67 INIT_LIST_HEAD(&tr->tr_databuf); 68 INIT_LIST_HEAD(&tr->tr_buf); 69 INIT_LIST_HEAD(&tr->tr_list); 70 INIT_LIST_HEAD(&tr->tr_ail1_list); 71 INIT_LIST_HEAD(&tr->tr_ail2_list); 72 73 if (gfs2_assert_warn(sdp, tr->tr_reserved <= sdp->sd_jdesc->jd_blocks)) 74 return -EINVAL; 75 76 sb_start_intwrite(sdp->sd_vfs); 77 78 /* 79 * Try the reservations under sd_log_flush_lock to prevent log flushes 80 * from creating inconsistencies between the number of allocated and 81 * reserved revokes. If that fails, do a full-block allocation outside 82 * of the lock to avoid stalling log flushes. Then, allot the 83 * appropriate number of blocks to revokes, use as many revokes locally 84 * as needed, and "release" the surplus into the revokes pool. 85 */ 86 87 down_read(&sdp->sd_log_flush_lock); 88 if (gfs2_log_try_reserve(sdp, tr, &extra_revokes)) 89 goto reserved; 90 up_read(&sdp->sd_log_flush_lock); 91 gfs2_log_reserve(sdp, tr, &extra_revokes); 92 down_read(&sdp->sd_log_flush_lock); 93 94 reserved: 95 gfs2_log_release_revokes(sdp, extra_revokes); 96 if (unlikely(!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))) { 97 gfs2_log_release_revokes(sdp, tr->tr_revokes); 98 up_read(&sdp->sd_log_flush_lock); 99 gfs2_log_release(sdp, tr->tr_reserved); 100 sb_end_intwrite(sdp->sd_vfs); 101 return -EROFS; 102 } 103 104 current->journal_info = tr; 105 106 return 0; 107 } 108 109 int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks, 110 unsigned int revokes) 111 { 112 struct gfs2_trans *tr; 113 int error; 114 115 tr = kmem_cache_zalloc(gfs2_trans_cachep, GFP_NOFS); 116 if (!tr) 117 return -ENOMEM; 118 error = __gfs2_trans_begin(tr, sdp, blocks, revokes, _RET_IP_); 119 if (error) 120 kmem_cache_free(gfs2_trans_cachep, tr); 121 return error; 122 } 123 124 void gfs2_trans_end(struct gfs2_sbd *sdp) 125 { 126 struct gfs2_trans *tr = current->journal_info; 127 s64 nbuf; 128 129 current->journal_info = NULL; 130 131 if (!test_bit(TR_TOUCHED, &tr->tr_flags)) { 132 gfs2_log_release_revokes(sdp, tr->tr_revokes); 133 up_read(&sdp->sd_log_flush_lock); 134 gfs2_log_release(sdp, tr->tr_reserved); 135 if (!test_bit(TR_ONSTACK, &tr->tr_flags)) 136 gfs2_trans_free(sdp, tr); 137 sb_end_intwrite(sdp->sd_vfs); 138 return; 139 } 140 141 gfs2_log_release_revokes(sdp, tr->tr_revokes - tr->tr_num_revoke); 142 143 nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new; 144 nbuf -= tr->tr_num_buf_rm; 145 nbuf -= tr->tr_num_databuf_rm; 146 147 if (gfs2_assert_withdraw(sdp, nbuf <= tr->tr_blocks) || 148 gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes)) 149 gfs2_print_trans(sdp, tr); 150 151 gfs2_log_commit(sdp, tr); 152 if (!test_bit(TR_ONSTACK, &tr->tr_flags) && 153 !test_bit(TR_ATTACHED, &tr->tr_flags)) 154 gfs2_trans_free(sdp, tr); 155 up_read(&sdp->sd_log_flush_lock); 156 157 if (sdp->sd_vfs->s_flags & SB_SYNCHRONOUS) 158 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL | 159 GFS2_LFC_TRANS_END); 160 sb_end_intwrite(sdp->sd_vfs); 161 } 162 163 static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl, 164 struct buffer_head *bh) 165 { 166 struct gfs2_bufdata *bd; 167 168 bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL); 169 bd->bd_bh = bh; 170 bd->bd_gl = gl; 171 INIT_LIST_HEAD(&bd->bd_list); 172 INIT_LIST_HEAD(&bd->bd_ail_st_list); 173 INIT_LIST_HEAD(&bd->bd_ail_gl_list); 174 bh->b_private = bd; 175 return bd; 176 } 177 178 /** 179 * gfs2_trans_add_data - Add a databuf to the transaction. 180 * @gl: The inode glock associated with the buffer 181 * @bh: The buffer to add 182 * 183 * This is used in journaled data mode. 184 * We need to journal the data block in the same way as metadata in 185 * the functions above. The difference is that here we have a tag 186 * which is two __be64's being the block number (as per meta data) 187 * and a flag which says whether the data block needs escaping or 188 * not. This means we need a new log entry for each 251 or so data 189 * blocks, which isn't an enormous overhead but twice as much as 190 * for normal metadata blocks. 191 */ 192 void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh) 193 { 194 struct gfs2_trans *tr = current->journal_info; 195 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; 196 struct gfs2_bufdata *bd; 197 198 lock_buffer(bh); 199 if (buffer_pinned(bh)) { 200 set_bit(TR_TOUCHED, &tr->tr_flags); 201 goto out; 202 } 203 gfs2_log_lock(sdp); 204 bd = bh->b_private; 205 if (bd == NULL) { 206 gfs2_log_unlock(sdp); 207 unlock_buffer(bh); 208 if (bh->b_private == NULL) 209 bd = gfs2_alloc_bufdata(gl, bh); 210 else 211 bd = bh->b_private; 212 lock_buffer(bh); 213 gfs2_log_lock(sdp); 214 } 215 gfs2_assert(sdp, bd->bd_gl == gl); 216 set_bit(TR_TOUCHED, &tr->tr_flags); 217 if (list_empty(&bd->bd_list)) { 218 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); 219 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags); 220 gfs2_pin(sdp, bd->bd_bh); 221 tr->tr_num_databuf_new++; 222 list_add_tail(&bd->bd_list, &tr->tr_databuf); 223 } 224 gfs2_log_unlock(sdp); 225 out: 226 unlock_buffer(bh); 227 } 228 229 void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh) 230 { 231 232 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; 233 struct gfs2_bufdata *bd; 234 struct gfs2_meta_header *mh; 235 struct gfs2_trans *tr = current->journal_info; 236 enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state); 237 238 lock_buffer(bh); 239 if (buffer_pinned(bh)) { 240 set_bit(TR_TOUCHED, &tr->tr_flags); 241 goto out; 242 } 243 gfs2_log_lock(sdp); 244 bd = bh->b_private; 245 if (bd == NULL) { 246 gfs2_log_unlock(sdp); 247 unlock_buffer(bh); 248 lock_page(bh->b_page); 249 if (bh->b_private == NULL) 250 bd = gfs2_alloc_bufdata(gl, bh); 251 else 252 bd = bh->b_private; 253 unlock_page(bh->b_page); 254 lock_buffer(bh); 255 gfs2_log_lock(sdp); 256 } 257 gfs2_assert(sdp, bd->bd_gl == gl); 258 set_bit(TR_TOUCHED, &tr->tr_flags); 259 if (!list_empty(&bd->bd_list)) 260 goto out_unlock; 261 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); 262 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags); 263 mh = (struct gfs2_meta_header *)bd->bd_bh->b_data; 264 if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) { 265 fs_err(sdp, "Attempting to add uninitialised block to " 266 "journal (inplace block=%lld)\n", 267 (unsigned long long)bd->bd_bh->b_blocknr); 268 BUG(); 269 } 270 if (unlikely(state == SFS_FROZEN)) { 271 fs_info(sdp, "GFS2:adding buf while frozen\n"); 272 gfs2_assert_withdraw(sdp, 0); 273 } 274 if (unlikely(gfs2_withdrawn(sdp))) { 275 fs_info(sdp, "GFS2:adding buf while withdrawn! 0x%llx\n", 276 (unsigned long long)bd->bd_bh->b_blocknr); 277 } 278 gfs2_pin(sdp, bd->bd_bh); 279 mh->__pad0 = cpu_to_be64(0); 280 mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid); 281 list_add(&bd->bd_list, &tr->tr_buf); 282 tr->tr_num_buf_new++; 283 out_unlock: 284 gfs2_log_unlock(sdp); 285 out: 286 unlock_buffer(bh); 287 } 288 289 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) 290 { 291 struct gfs2_trans *tr = current->journal_info; 292 293 BUG_ON(!list_empty(&bd->bd_list)); 294 gfs2_add_revoke(sdp, bd); 295 set_bit(TR_TOUCHED, &tr->tr_flags); 296 tr->tr_num_revoke++; 297 } 298 299 void gfs2_trans_remove_revoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len) 300 { 301 struct gfs2_bufdata *bd, *tmp; 302 unsigned int n = len; 303 304 gfs2_log_lock(sdp); 305 list_for_each_entry_safe(bd, tmp, &sdp->sd_log_revokes, bd_list) { 306 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) { 307 list_del_init(&bd->bd_list); 308 gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke); 309 sdp->sd_log_num_revoke--; 310 if (bd->bd_gl) 311 gfs2_glock_remove_revoke(bd->bd_gl); 312 kmem_cache_free(gfs2_bufdata_cachep, bd); 313 gfs2_log_release_revokes(sdp, 1); 314 if (--n == 0) 315 break; 316 } 317 } 318 gfs2_log_unlock(sdp); 319 } 320 321 void gfs2_trans_free(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 322 { 323 if (tr == NULL) 324 return; 325 326 gfs2_assert_warn(sdp, list_empty(&tr->tr_ail1_list)); 327 gfs2_assert_warn(sdp, list_empty(&tr->tr_ail2_list)); 328 gfs2_assert_warn(sdp, list_empty(&tr->tr_databuf)); 329 gfs2_assert_warn(sdp, list_empty(&tr->tr_buf)); 330 kmem_cache_free(gfs2_trans_cachep, tr); 331 } 332