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 print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip); 100 printk(KERN_WARNING "GFS2: blocks=%u revokes=%u reserved=%u touched=%d\n", 101 tr->tr_blocks, tr->tr_revokes, tr->tr_reserved, tr->tr_touched); 102 printk(KERN_WARNING "GFS2: Buf %u/%u Databuf %u/%u Revoke %u/%u\n", 103 tr->tr_num_buf_new, tr->tr_num_buf_rm, 104 tr->tr_num_databuf_new, tr->tr_num_databuf_rm, 105 tr->tr_num_revoke, tr->tr_num_revoke_rm); 106 } 107 108 void gfs2_trans_end(struct gfs2_sbd *sdp) 109 { 110 struct gfs2_trans *tr = current->journal_info; 111 s64 nbuf; 112 BUG_ON(!tr); 113 current->journal_info = NULL; 114 115 if (!tr->tr_touched) { 116 gfs2_log_release(sdp, tr->tr_reserved); 117 if (tr->tr_t_gh.gh_gl) { 118 gfs2_glock_dq(&tr->tr_t_gh); 119 gfs2_holder_uninit(&tr->tr_t_gh); 120 kfree(tr); 121 } 122 sb_end_intwrite(sdp->sd_vfs); 123 return; 124 } 125 126 nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new; 127 nbuf -= tr->tr_num_buf_rm; 128 nbuf -= tr->tr_num_databuf_rm; 129 130 if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) && 131 (tr->tr_num_revoke <= tr->tr_revokes))) 132 gfs2_print_trans(tr); 133 134 gfs2_log_commit(sdp, tr); 135 if (tr->tr_t_gh.gh_gl) { 136 gfs2_glock_dq(&tr->tr_t_gh); 137 gfs2_holder_uninit(&tr->tr_t_gh); 138 kfree(tr); 139 } 140 141 if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS) 142 gfs2_log_flush(sdp, NULL); 143 sb_end_intwrite(sdp->sd_vfs); 144 } 145 146 static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl, 147 struct buffer_head *bh, 148 const struct gfs2_log_operations *lops) 149 { 150 struct gfs2_bufdata *bd; 151 152 bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL); 153 bd->bd_bh = bh; 154 bd->bd_gl = gl; 155 bd->bd_ops = lops; 156 INIT_LIST_HEAD(&bd->bd_list); 157 bh->b_private = bd; 158 return bd; 159 } 160 161 /** 162 * gfs2_trans_add_data - Add a databuf to the transaction. 163 * @gl: The inode glock associated with the buffer 164 * @bh: The buffer to add 165 * 166 * This is used in two distinct cases: 167 * i) In ordered write mode 168 * We put the data buffer on a list so that we can ensure that its 169 * synced to disk at the right time 170 * ii) In journaled data mode 171 * We need to journal the data block in the same way as metadata in 172 * the functions above. The difference is that here we have a tag 173 * which is two __be64's being the block number (as per meta data) 174 * and a flag which says whether the data block needs escaping or 175 * not. This means we need a new log entry for each 251 or so data 176 * blocks, which isn't an enormous overhead but twice as much as 177 * for normal metadata blocks. 178 */ 179 void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh) 180 { 181 struct gfs2_trans *tr = current->journal_info; 182 struct gfs2_sbd *sdp = gl->gl_sbd; 183 struct address_space *mapping = bh->b_page->mapping; 184 struct gfs2_inode *ip = GFS2_I(mapping->host); 185 struct gfs2_bufdata *bd; 186 187 if (!gfs2_is_jdata(ip)) { 188 gfs2_ordered_add_inode(ip); 189 return; 190 } 191 192 lock_buffer(bh); 193 gfs2_log_lock(sdp); 194 bd = bh->b_private; 195 if (bd == NULL) { 196 gfs2_log_unlock(sdp); 197 unlock_buffer(bh); 198 if (bh->b_private == NULL) 199 bd = gfs2_alloc_bufdata(gl, bh, &gfs2_databuf_lops); 200 lock_buffer(bh); 201 gfs2_log_lock(sdp); 202 } 203 gfs2_assert(sdp, bd->bd_gl == gl); 204 tr->tr_touched = 1; 205 if (list_empty(&bd->bd_list)) { 206 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); 207 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags); 208 gfs2_pin(sdp, bd->bd_bh); 209 tr->tr_num_databuf_new++; 210 sdp->sd_log_num_databuf++; 211 list_add_tail(&bd->bd_list, &sdp->sd_log_le_databuf); 212 } 213 gfs2_log_unlock(sdp); 214 unlock_buffer(bh); 215 } 216 217 static void meta_lo_add(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) 218 { 219 struct gfs2_meta_header *mh; 220 struct gfs2_trans *tr; 221 222 tr = current->journal_info; 223 tr->tr_touched = 1; 224 if (!list_empty(&bd->bd_list)) 225 return; 226 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); 227 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags); 228 mh = (struct gfs2_meta_header *)bd->bd_bh->b_data; 229 if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) { 230 printk(KERN_ERR 231 "Attempting to add uninitialised block to journal (inplace block=%lld)\n", 232 (unsigned long long)bd->bd_bh->b_blocknr); 233 BUG(); 234 } 235 gfs2_pin(sdp, bd->bd_bh); 236 mh->__pad0 = cpu_to_be64(0); 237 mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid); 238 sdp->sd_log_num_buf++; 239 list_add(&bd->bd_list, &sdp->sd_log_le_buf); 240 tr->tr_num_buf_new++; 241 } 242 243 void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh) 244 { 245 246 struct gfs2_sbd *sdp = gl->gl_sbd; 247 struct gfs2_bufdata *bd; 248 249 lock_buffer(bh); 250 gfs2_log_lock(sdp); 251 bd = bh->b_private; 252 if (bd == NULL) { 253 gfs2_log_unlock(sdp); 254 unlock_buffer(bh); 255 lock_page(bh->b_page); 256 if (bh->b_private == NULL) 257 bd = gfs2_alloc_bufdata(gl, bh, &gfs2_buf_lops); 258 unlock_page(bh->b_page); 259 lock_buffer(bh); 260 gfs2_log_lock(sdp); 261 } 262 gfs2_assert(sdp, bd->bd_gl == gl); 263 meta_lo_add(sdp, bd); 264 gfs2_log_unlock(sdp); 265 unlock_buffer(bh); 266 } 267 268 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) 269 { 270 struct gfs2_glock *gl = bd->bd_gl; 271 struct gfs2_trans *tr = current->journal_info; 272 273 BUG_ON(!list_empty(&bd->bd_list)); 274 BUG_ON(!list_empty(&bd->bd_ail_st_list)); 275 BUG_ON(!list_empty(&bd->bd_ail_gl_list)); 276 bd->bd_ops = &gfs2_revoke_lops; 277 tr->tr_touched = 1; 278 tr->tr_num_revoke++; 279 sdp->sd_log_num_revoke++; 280 atomic_inc(&gl->gl_revokes); 281 set_bit(GLF_LFLUSH, &gl->gl_flags); 282 list_add(&bd->bd_list, &sdp->sd_log_le_revoke); 283 } 284 285 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len) 286 { 287 struct gfs2_bufdata *bd, *tmp; 288 struct gfs2_trans *tr = current->journal_info; 289 unsigned int n = len; 290 291 gfs2_log_lock(sdp); 292 list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_list) { 293 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) { 294 list_del_init(&bd->bd_list); 295 gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke); 296 sdp->sd_log_num_revoke--; 297 kmem_cache_free(gfs2_bufdata_cachep, bd); 298 tr->tr_num_revoke_rm++; 299 if (--n == 0) 300 break; 301 } 302 } 303 gfs2_log_unlock(sdp); 304 } 305 306