1 /* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 4 * 5 * This copyrighted material is made available to anyone wishing to use, 6 * modify, copy, or redistribute it subject to the terms and conditions 7 * of the GNU General Public License version 2. 8 */ 9 10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 11 12 #include <linux/sched.h> 13 #include <linux/slab.h> 14 #include <linux/spinlock.h> 15 #include <linux/completion.h> 16 #include <linux/buffer_head.h> 17 #include <linux/kallsyms.h> 18 #include <linux/gfs2_ondisk.h> 19 20 #include "gfs2.h" 21 #include "incore.h" 22 #include "glock.h" 23 #include "inode.h" 24 #include "log.h" 25 #include "lops.h" 26 #include "meta_io.h" 27 #include "trans.h" 28 #include "util.h" 29 #include "trace_gfs2.h" 30 31 int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks, 32 unsigned int revokes) 33 { 34 struct gfs2_trans *tr; 35 int error; 36 37 BUG_ON(current->journal_info); 38 BUG_ON(blocks == 0 && revokes == 0); 39 40 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) 41 return -EROFS; 42 43 tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS); 44 if (!tr) 45 return -ENOMEM; 46 47 tr->tr_ip = _RET_IP_; 48 tr->tr_blocks = blocks; 49 tr->tr_revokes = revokes; 50 tr->tr_reserved = 1; 51 set_bit(TR_ALLOCED, &tr->tr_flags); 52 if (blocks) 53 tr->tr_reserved += 6 + blocks; 54 if (revokes) 55 tr->tr_reserved += gfs2_struct2blk(sdp, revokes, 56 sizeof(u64)); 57 INIT_LIST_HEAD(&tr->tr_databuf); 58 INIT_LIST_HEAD(&tr->tr_buf); 59 60 sb_start_intwrite(sdp->sd_vfs); 61 62 error = gfs2_log_reserve(sdp, tr->tr_reserved); 63 if (error) 64 goto fail; 65 66 current->journal_info = tr; 67 68 return 0; 69 70 fail: 71 sb_end_intwrite(sdp->sd_vfs); 72 kfree(tr); 73 74 return error; 75 } 76 77 static void gfs2_print_trans(const struct gfs2_trans *tr) 78 { 79 pr_warn("Transaction created at: %pSR\n", (void *)tr->tr_ip); 80 pr_warn("blocks=%u revokes=%u reserved=%u touched=%u\n", 81 tr->tr_blocks, tr->tr_revokes, tr->tr_reserved, 82 test_bit(TR_TOUCHED, &tr->tr_flags)); 83 pr_warn("Buf %u/%u Databuf %u/%u Revoke %u/%u\n", 84 tr->tr_num_buf_new, tr->tr_num_buf_rm, 85 tr->tr_num_databuf_new, tr->tr_num_databuf_rm, 86 tr->tr_num_revoke, tr->tr_num_revoke_rm); 87 } 88 89 void gfs2_trans_end(struct gfs2_sbd *sdp) 90 { 91 struct gfs2_trans *tr = current->journal_info; 92 s64 nbuf; 93 int alloced = test_bit(TR_ALLOCED, &tr->tr_flags); 94 95 current->journal_info = NULL; 96 97 if (!test_bit(TR_TOUCHED, &tr->tr_flags)) { 98 gfs2_log_release(sdp, tr->tr_reserved); 99 if (alloced) { 100 kfree(tr); 101 sb_end_intwrite(sdp->sd_vfs); 102 } 103 return; 104 } 105 106 nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new; 107 nbuf -= tr->tr_num_buf_rm; 108 nbuf -= tr->tr_num_databuf_rm; 109 110 if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) && 111 (tr->tr_num_revoke <= tr->tr_revokes))) 112 gfs2_print_trans(tr); 113 114 gfs2_log_commit(sdp, tr); 115 if (alloced && !test_bit(TR_ATTACHED, &tr->tr_flags)) 116 kfree(tr); 117 up_read(&sdp->sd_log_flush_lock); 118 119 if (sdp->sd_vfs->s_flags & SB_SYNCHRONOUS) 120 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL | 121 GFS2_LFC_TRANS_END); 122 if (alloced) 123 sb_end_intwrite(sdp->sd_vfs); 124 } 125 126 static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl, 127 struct buffer_head *bh, 128 const struct gfs2_log_operations *lops) 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 bd->bd_ops = lops; 136 INIT_LIST_HEAD(&bd->bd_list); 137 bh->b_private = bd; 138 return bd; 139 } 140 141 /** 142 * gfs2_trans_add_data - Add a databuf to the transaction. 143 * @gl: The inode glock associated with the buffer 144 * @bh: The buffer to add 145 * 146 * This is used in journaled data mode. 147 * We need to journal the data block in the same way as metadata in 148 * the functions above. The difference is that here we have a tag 149 * which is two __be64's being the block number (as per meta data) 150 * and a flag which says whether the data block needs escaping or 151 * not. This means we need a new log entry for each 251 or so data 152 * blocks, which isn't an enormous overhead but twice as much as 153 * for normal metadata blocks. 154 */ 155 void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh) 156 { 157 struct gfs2_trans *tr = current->journal_info; 158 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; 159 struct gfs2_bufdata *bd; 160 161 lock_buffer(bh); 162 if (buffer_pinned(bh)) { 163 set_bit(TR_TOUCHED, &tr->tr_flags); 164 goto out; 165 } 166 gfs2_log_lock(sdp); 167 bd = bh->b_private; 168 if (bd == NULL) { 169 gfs2_log_unlock(sdp); 170 unlock_buffer(bh); 171 if (bh->b_private == NULL) 172 bd = gfs2_alloc_bufdata(gl, bh, &gfs2_databuf_lops); 173 else 174 bd = bh->b_private; 175 lock_buffer(bh); 176 gfs2_log_lock(sdp); 177 } 178 gfs2_assert(sdp, bd->bd_gl == gl); 179 set_bit(TR_TOUCHED, &tr->tr_flags); 180 if (list_empty(&bd->bd_list)) { 181 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); 182 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags); 183 gfs2_pin(sdp, bd->bd_bh); 184 tr->tr_num_databuf_new++; 185 list_add_tail(&bd->bd_list, &tr->tr_databuf); 186 } 187 gfs2_log_unlock(sdp); 188 out: 189 unlock_buffer(bh); 190 } 191 192 void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh) 193 { 194 195 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; 196 struct gfs2_bufdata *bd; 197 struct gfs2_meta_header *mh; 198 struct gfs2_trans *tr = current->journal_info; 199 enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state); 200 201 lock_buffer(bh); 202 if (buffer_pinned(bh)) { 203 set_bit(TR_TOUCHED, &tr->tr_flags); 204 goto out; 205 } 206 gfs2_log_lock(sdp); 207 bd = bh->b_private; 208 if (bd == NULL) { 209 gfs2_log_unlock(sdp); 210 unlock_buffer(bh); 211 lock_page(bh->b_page); 212 if (bh->b_private == NULL) 213 bd = gfs2_alloc_bufdata(gl, bh, &gfs2_buf_lops); 214 else 215 bd = bh->b_private; 216 unlock_page(bh->b_page); 217 lock_buffer(bh); 218 gfs2_log_lock(sdp); 219 } 220 gfs2_assert(sdp, bd->bd_gl == gl); 221 set_bit(TR_TOUCHED, &tr->tr_flags); 222 if (!list_empty(&bd->bd_list)) 223 goto out_unlock; 224 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); 225 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags); 226 mh = (struct gfs2_meta_header *)bd->bd_bh->b_data; 227 if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) { 228 pr_err("Attempting to add uninitialised block to journal (inplace block=%lld)\n", 229 (unsigned long long)bd->bd_bh->b_blocknr); 230 BUG(); 231 } 232 if (unlikely(state == SFS_FROZEN)) { 233 printk(KERN_INFO "GFS2:adding buf while frozen\n"); 234 gfs2_assert_withdraw(sdp, 0); 235 } 236 gfs2_pin(sdp, bd->bd_bh); 237 mh->__pad0 = cpu_to_be64(0); 238 mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid); 239 list_add(&bd->bd_list, &tr->tr_buf); 240 tr->tr_num_buf_new++; 241 out_unlock: 242 gfs2_log_unlock(sdp); 243 out: 244 unlock_buffer(bh); 245 } 246 247 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) 248 { 249 struct gfs2_trans *tr = current->journal_info; 250 251 BUG_ON(!list_empty(&bd->bd_list)); 252 gfs2_add_revoke(sdp, bd); 253 set_bit(TR_TOUCHED, &tr->tr_flags); 254 tr->tr_num_revoke++; 255 } 256 257 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len) 258 { 259 struct gfs2_bufdata *bd, *tmp; 260 struct gfs2_trans *tr = current->journal_info; 261 unsigned int n = len; 262 263 gfs2_log_lock(sdp); 264 list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_list) { 265 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) { 266 list_del_init(&bd->bd_list); 267 gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke); 268 sdp->sd_log_num_revoke--; 269 kmem_cache_free(gfs2_bufdata_cachep, bd); 270 tr->tr_num_revoke_rm++; 271 if (--n == 0) 272 break; 273 } 274 } 275 gfs2_log_unlock(sdp); 276 } 277 278