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 bh->b_private = bd; 173 return bd; 174 } 175 176 /** 177 * gfs2_trans_add_data - Add a databuf to the transaction. 178 * @gl: The inode glock associated with the buffer 179 * @bh: The buffer to add 180 * 181 * This is used in journaled data mode. 182 * We need to journal the data block in the same way as metadata in 183 * the functions above. The difference is that here we have a tag 184 * which is two __be64's being the block number (as per meta data) 185 * and a flag which says whether the data block needs escaping or 186 * not. This means we need a new log entry for each 251 or so data 187 * blocks, which isn't an enormous overhead but twice as much as 188 * for normal metadata blocks. 189 */ 190 void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh) 191 { 192 struct gfs2_trans *tr = current->journal_info; 193 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; 194 struct gfs2_bufdata *bd; 195 196 lock_buffer(bh); 197 if (buffer_pinned(bh)) { 198 set_bit(TR_TOUCHED, &tr->tr_flags); 199 goto out; 200 } 201 gfs2_log_lock(sdp); 202 bd = bh->b_private; 203 if (bd == NULL) { 204 gfs2_log_unlock(sdp); 205 unlock_buffer(bh); 206 if (bh->b_private == NULL) 207 bd = gfs2_alloc_bufdata(gl, bh); 208 else 209 bd = bh->b_private; 210 lock_buffer(bh); 211 gfs2_log_lock(sdp); 212 } 213 gfs2_assert(sdp, bd->bd_gl == gl); 214 set_bit(TR_TOUCHED, &tr->tr_flags); 215 if (list_empty(&bd->bd_list)) { 216 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); 217 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags); 218 gfs2_pin(sdp, bd->bd_bh); 219 tr->tr_num_databuf_new++; 220 list_add_tail(&bd->bd_list, &tr->tr_databuf); 221 } 222 gfs2_log_unlock(sdp); 223 out: 224 unlock_buffer(bh); 225 } 226 227 void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh) 228 { 229 230 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; 231 struct gfs2_bufdata *bd; 232 struct gfs2_meta_header *mh; 233 struct gfs2_trans *tr = current->journal_info; 234 enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state); 235 236 lock_buffer(bh); 237 if (buffer_pinned(bh)) { 238 set_bit(TR_TOUCHED, &tr->tr_flags); 239 goto out; 240 } 241 gfs2_log_lock(sdp); 242 bd = bh->b_private; 243 if (bd == NULL) { 244 gfs2_log_unlock(sdp); 245 unlock_buffer(bh); 246 lock_page(bh->b_page); 247 if (bh->b_private == NULL) 248 bd = gfs2_alloc_bufdata(gl, bh); 249 else 250 bd = bh->b_private; 251 unlock_page(bh->b_page); 252 lock_buffer(bh); 253 gfs2_log_lock(sdp); 254 } 255 gfs2_assert(sdp, bd->bd_gl == gl); 256 set_bit(TR_TOUCHED, &tr->tr_flags); 257 if (!list_empty(&bd->bd_list)) 258 goto out_unlock; 259 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); 260 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags); 261 mh = (struct gfs2_meta_header *)bd->bd_bh->b_data; 262 if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) { 263 fs_err(sdp, "Attempting to add uninitialised block to " 264 "journal (inplace block=%lld)\n", 265 (unsigned long long)bd->bd_bh->b_blocknr); 266 BUG(); 267 } 268 if (unlikely(state == SFS_FROZEN)) { 269 fs_info(sdp, "GFS2:adding buf while frozen\n"); 270 gfs2_assert_withdraw(sdp, 0); 271 } 272 if (unlikely(gfs2_withdrawn(sdp))) { 273 fs_info(sdp, "GFS2:adding buf while withdrawn! 0x%llx\n", 274 (unsigned long long)bd->bd_bh->b_blocknr); 275 } 276 gfs2_pin(sdp, bd->bd_bh); 277 mh->__pad0 = cpu_to_be64(0); 278 mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid); 279 list_add(&bd->bd_list, &tr->tr_buf); 280 tr->tr_num_buf_new++; 281 out_unlock: 282 gfs2_log_unlock(sdp); 283 out: 284 unlock_buffer(bh); 285 } 286 287 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) 288 { 289 struct gfs2_trans *tr = current->journal_info; 290 291 BUG_ON(!list_empty(&bd->bd_list)); 292 gfs2_add_revoke(sdp, bd); 293 set_bit(TR_TOUCHED, &tr->tr_flags); 294 tr->tr_num_revoke++; 295 } 296 297 void gfs2_trans_remove_revoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len) 298 { 299 struct gfs2_bufdata *bd, *tmp; 300 unsigned int n = len; 301 302 gfs2_log_lock(sdp); 303 list_for_each_entry_safe(bd, tmp, &sdp->sd_log_revokes, bd_list) { 304 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) { 305 list_del_init(&bd->bd_list); 306 gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke); 307 sdp->sd_log_num_revoke--; 308 if (bd->bd_gl) 309 gfs2_glock_remove_revoke(bd->bd_gl); 310 kmem_cache_free(gfs2_bufdata_cachep, bd); 311 gfs2_log_release_revokes(sdp, 1); 312 if (--n == 0) 313 break; 314 } 315 } 316 gfs2_log_unlock(sdp); 317 } 318 319 void gfs2_trans_free(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 320 { 321 if (tr == NULL) 322 return; 323 324 gfs2_assert_warn(sdp, list_empty(&tr->tr_ail1_list)); 325 gfs2_assert_warn(sdp, list_empty(&tr->tr_ail2_list)); 326 gfs2_assert_warn(sdp, list_empty(&tr->tr_databuf)); 327 gfs2_assert_warn(sdp, list_empty(&tr->tr_buf)); 328 kmem_cache_free(gfs2_trans_cachep, tr); 329 } 330