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