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