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 #include <linux/sched.h> 11 #include <linux/slab.h> 12 #include <linux/spinlock.h> 13 #include <linux/completion.h> 14 #include <linux/buffer_head.h> 15 #include <linux/kallsyms.h> 16 #include <linux/gfs2_ondisk.h> 17 18 #include "gfs2.h" 19 #include "incore.h" 20 #include "glock.h" 21 #include "inode.h" 22 #include "log.h" 23 #include "lops.h" 24 #include "meta_io.h" 25 #include "trans.h" 26 #include "util.h" 27 #include "trace_gfs2.h" 28 29 int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks, 30 unsigned int revokes) 31 { 32 struct gfs2_trans *tr; 33 int error; 34 35 BUG_ON(current->journal_info); 36 BUG_ON(blocks == 0 && revokes == 0); 37 38 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) 39 return -EROFS; 40 41 tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS); 42 if (!tr) 43 return -ENOMEM; 44 45 tr->tr_ip = (unsigned long)__builtin_return_address(0); 46 tr->tr_blocks = blocks; 47 tr->tr_revokes = revokes; 48 tr->tr_reserved = 1; 49 if (blocks) 50 tr->tr_reserved += 6 + blocks; 51 if (revokes) 52 tr->tr_reserved += gfs2_struct2blk(sdp, revokes, 53 sizeof(u64)); 54 sb_start_intwrite(sdp->sd_vfs); 55 gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh); 56 57 error = gfs2_glock_nq(&tr->tr_t_gh); 58 if (error) 59 goto fail_holder_uninit; 60 61 error = gfs2_log_reserve(sdp, tr->tr_reserved); 62 if (error) 63 goto fail_gunlock; 64 65 current->journal_info = tr; 66 67 return 0; 68 69 fail_gunlock: 70 gfs2_glock_dq(&tr->tr_t_gh); 71 72 fail_holder_uninit: 73 sb_end_intwrite(sdp->sd_vfs); 74 gfs2_holder_uninit(&tr->tr_t_gh); 75 kfree(tr); 76 77 return error; 78 } 79 80 /** 81 * gfs2_log_release - Release a given number of log blocks 82 * @sdp: The GFS2 superblock 83 * @blks: The number of blocks 84 * 85 */ 86 87 static void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks) 88 { 89 90 atomic_add(blks, &sdp->sd_log_blks_free); 91 trace_gfs2_log_blocks(sdp, blks); 92 gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <= 93 sdp->sd_jdesc->jd_blocks); 94 up_read(&sdp->sd_log_flush_lock); 95 } 96 97 static void gfs2_print_trans(const struct gfs2_trans *tr) 98 { 99 printk(KERN_WARNING "GFS2: Transaction created at: %pSR\n", 100 (void *)tr->tr_ip); 101 printk(KERN_WARNING "GFS2: blocks=%u revokes=%u reserved=%u touched=%d\n", 102 tr->tr_blocks, tr->tr_revokes, tr->tr_reserved, tr->tr_touched); 103 printk(KERN_WARNING "GFS2: Buf %u/%u Databuf %u/%u Revoke %u/%u\n", 104 tr->tr_num_buf_new, tr->tr_num_buf_rm, 105 tr->tr_num_databuf_new, tr->tr_num_databuf_rm, 106 tr->tr_num_revoke, tr->tr_num_revoke_rm); 107 } 108 109 void gfs2_trans_end(struct gfs2_sbd *sdp) 110 { 111 struct gfs2_trans *tr = current->journal_info; 112 s64 nbuf; 113 BUG_ON(!tr); 114 current->journal_info = NULL; 115 116 if (!tr->tr_touched) { 117 gfs2_log_release(sdp, tr->tr_reserved); 118 if (tr->tr_t_gh.gh_gl) { 119 gfs2_glock_dq(&tr->tr_t_gh); 120 gfs2_holder_uninit(&tr->tr_t_gh); 121 kfree(tr); 122 } 123 sb_end_intwrite(sdp->sd_vfs); 124 return; 125 } 126 127 nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new; 128 nbuf -= tr->tr_num_buf_rm; 129 nbuf -= tr->tr_num_databuf_rm; 130 131 if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) && 132 (tr->tr_num_revoke <= tr->tr_revokes))) 133 gfs2_print_trans(tr); 134 135 gfs2_log_commit(sdp, tr); 136 if (tr->tr_t_gh.gh_gl) { 137 gfs2_glock_dq(&tr->tr_t_gh); 138 gfs2_holder_uninit(&tr->tr_t_gh); 139 if (!tr->tr_attached) 140 kfree(tr); 141 } 142 up_read(&sdp->sd_log_flush_lock); 143 144 if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS) 145 gfs2_log_flush(sdp, NULL); 146 sb_end_intwrite(sdp->sd_vfs); 147 } 148 149 static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl, 150 struct buffer_head *bh, 151 const struct gfs2_log_operations *lops) 152 { 153 struct gfs2_bufdata *bd; 154 155 bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL); 156 bd->bd_bh = bh; 157 bd->bd_gl = gl; 158 bd->bd_ops = lops; 159 INIT_LIST_HEAD(&bd->bd_list); 160 bh->b_private = bd; 161 return bd; 162 } 163 164 /** 165 * gfs2_trans_add_data - Add a databuf to the transaction. 166 * @gl: The inode glock associated with the buffer 167 * @bh: The buffer to add 168 * 169 * This is used in two distinct cases: 170 * i) In ordered write mode 171 * We put the data buffer on a list so that we can ensure that its 172 * synced to disk at the right time 173 * ii) In journaled data mode 174 * We need to journal the data block in the same way as metadata in 175 * the functions above. The difference is that here we have a tag 176 * which is two __be64's being the block number (as per meta data) 177 * and a flag which says whether the data block needs escaping or 178 * not. This means we need a new log entry for each 251 or so data 179 * blocks, which isn't an enormous overhead but twice as much as 180 * for normal metadata blocks. 181 */ 182 void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh) 183 { 184 struct gfs2_trans *tr = current->journal_info; 185 struct gfs2_sbd *sdp = gl->gl_sbd; 186 struct address_space *mapping = bh->b_page->mapping; 187 struct gfs2_inode *ip = GFS2_I(mapping->host); 188 struct gfs2_bufdata *bd; 189 190 if (!gfs2_is_jdata(ip)) { 191 gfs2_ordered_add_inode(ip); 192 return; 193 } 194 195 lock_buffer(bh); 196 gfs2_log_lock(sdp); 197 bd = bh->b_private; 198 if (bd == NULL) { 199 gfs2_log_unlock(sdp); 200 unlock_buffer(bh); 201 if (bh->b_private == NULL) 202 bd = gfs2_alloc_bufdata(gl, bh, &gfs2_databuf_lops); 203 lock_buffer(bh); 204 gfs2_log_lock(sdp); 205 } 206 gfs2_assert(sdp, bd->bd_gl == gl); 207 tr->tr_touched = 1; 208 if (list_empty(&bd->bd_list)) { 209 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); 210 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags); 211 gfs2_pin(sdp, bd->bd_bh); 212 tr->tr_num_databuf_new++; 213 sdp->sd_log_num_databuf++; 214 list_add_tail(&bd->bd_list, &sdp->sd_log_le_databuf); 215 } 216 gfs2_log_unlock(sdp); 217 unlock_buffer(bh); 218 } 219 220 static void meta_lo_add(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) 221 { 222 struct gfs2_meta_header *mh; 223 struct gfs2_trans *tr; 224 225 tr = current->journal_info; 226 tr->tr_touched = 1; 227 if (!list_empty(&bd->bd_list)) 228 return; 229 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); 230 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags); 231 mh = (struct gfs2_meta_header *)bd->bd_bh->b_data; 232 if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) { 233 printk(KERN_ERR 234 "Attempting to add uninitialised block to journal (inplace block=%lld)\n", 235 (unsigned long long)bd->bd_bh->b_blocknr); 236 BUG(); 237 } 238 gfs2_pin(sdp, bd->bd_bh); 239 mh->__pad0 = cpu_to_be64(0); 240 mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid); 241 sdp->sd_log_num_buf++; 242 list_add(&bd->bd_list, &sdp->sd_log_le_buf); 243 tr->tr_num_buf_new++; 244 } 245 246 void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh) 247 { 248 249 struct gfs2_sbd *sdp = gl->gl_sbd; 250 struct gfs2_bufdata *bd; 251 252 lock_buffer(bh); 253 gfs2_log_lock(sdp); 254 bd = bh->b_private; 255 if (bd == NULL) { 256 gfs2_log_unlock(sdp); 257 unlock_buffer(bh); 258 lock_page(bh->b_page); 259 if (bh->b_private == NULL) 260 bd = gfs2_alloc_bufdata(gl, bh, &gfs2_buf_lops); 261 unlock_page(bh->b_page); 262 lock_buffer(bh); 263 gfs2_log_lock(sdp); 264 } 265 gfs2_assert(sdp, bd->bd_gl == gl); 266 meta_lo_add(sdp, bd); 267 gfs2_log_unlock(sdp); 268 unlock_buffer(bh); 269 } 270 271 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) 272 { 273 struct gfs2_trans *tr = current->journal_info; 274 275 BUG_ON(!list_empty(&bd->bd_list)); 276 gfs2_add_revoke(sdp, bd); 277 tr->tr_touched = 1; 278 tr->tr_num_revoke++; 279 } 280 281 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len) 282 { 283 struct gfs2_bufdata *bd, *tmp; 284 struct gfs2_trans *tr = current->journal_info; 285 unsigned int n = len; 286 287 gfs2_log_lock(sdp); 288 list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_list) { 289 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) { 290 list_del_init(&bd->bd_list); 291 gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke); 292 sdp->sd_log_num_revoke--; 293 kmem_cache_free(gfs2_bufdata_cachep, bd); 294 tr->tr_num_revoke_rm++; 295 if (--n == 0) 296 break; 297 } 298 } 299 gfs2_log_unlock(sdp); 300 } 301 302