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 "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 = (unsigned long)__builtin_return_address(0); 45 tr->tr_blocks = blocks; 46 tr->tr_revokes = revokes; 47 tr->tr_reserved = 1; 48 if (blocks) 49 tr->tr_reserved += 6 + blocks; 50 if (revokes) 51 tr->tr_reserved += gfs2_struct2blk(sdp, revokes, 52 sizeof(u64)); 53 gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh); 54 55 error = gfs2_glock_nq(&tr->tr_t_gh); 56 if (error) 57 goto fail_holder_uninit; 58 59 error = gfs2_log_reserve(sdp, tr->tr_reserved); 60 if (error) 61 goto fail_gunlock; 62 63 current->journal_info = tr; 64 65 return 0; 66 67 fail_gunlock: 68 gfs2_glock_dq(&tr->tr_t_gh); 69 70 fail_holder_uninit: 71 gfs2_holder_uninit(&tr->tr_t_gh); 72 kfree(tr); 73 74 return error; 75 } 76 77 /** 78 * gfs2_log_release - Release a given number of log blocks 79 * @sdp: The GFS2 superblock 80 * @blks: The number of blocks 81 * 82 */ 83 84 static void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks) 85 { 86 87 atomic_add(blks, &sdp->sd_log_blks_free); 88 trace_gfs2_log_blocks(sdp, blks); 89 gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <= 90 sdp->sd_jdesc->jd_blocks); 91 up_read(&sdp->sd_log_flush_lock); 92 } 93 94 static void gfs2_print_trans(const struct gfs2_trans *tr) 95 { 96 print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip); 97 printk(KERN_WARNING "GFS2: blocks=%u revokes=%u reserved=%u touched=%d\n", 98 tr->tr_blocks, tr->tr_revokes, tr->tr_reserved, tr->tr_touched); 99 printk(KERN_WARNING "GFS2: Buf %u/%u Databuf %u/%u Revoke %u/%u\n", 100 tr->tr_num_buf_new, tr->tr_num_buf_rm, 101 tr->tr_num_databuf_new, tr->tr_num_databuf_rm, 102 tr->tr_num_revoke, tr->tr_num_revoke_rm); 103 } 104 105 void gfs2_trans_end(struct gfs2_sbd *sdp) 106 { 107 struct gfs2_trans *tr = current->journal_info; 108 s64 nbuf; 109 BUG_ON(!tr); 110 current->journal_info = NULL; 111 112 if (!tr->tr_touched) { 113 gfs2_log_release(sdp, tr->tr_reserved); 114 if (tr->tr_t_gh.gh_gl) { 115 gfs2_glock_dq(&tr->tr_t_gh); 116 gfs2_holder_uninit(&tr->tr_t_gh); 117 kfree(tr); 118 } 119 return; 120 } 121 122 nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new; 123 nbuf -= tr->tr_num_buf_rm; 124 nbuf -= tr->tr_num_databuf_rm; 125 126 if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) && 127 (tr->tr_num_revoke <= tr->tr_revokes))) 128 gfs2_print_trans(tr); 129 130 gfs2_log_commit(sdp, tr); 131 if (tr->tr_t_gh.gh_gl) { 132 gfs2_glock_dq(&tr->tr_t_gh); 133 gfs2_holder_uninit(&tr->tr_t_gh); 134 kfree(tr); 135 } 136 137 if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS) 138 gfs2_log_flush(sdp, NULL); 139 } 140 141 /** 142 * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction 143 * @gl: the glock the buffer belongs to 144 * @bh: The buffer to add 145 * @meta: True in the case of adding metadata 146 * 147 */ 148 149 void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta) 150 { 151 struct gfs2_sbd *sdp = gl->gl_sbd; 152 struct gfs2_bufdata *bd; 153 154 bd = bh->b_private; 155 if (bd) 156 gfs2_assert(sdp, bd->bd_gl == gl); 157 else { 158 gfs2_attach_bufdata(gl, bh, meta); 159 bd = bh->b_private; 160 } 161 lops_add(sdp, bd); 162 } 163 164 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) 165 { 166 BUG_ON(!list_empty(&bd->bd_list)); 167 BUG_ON(!list_empty(&bd->bd_ail_st_list)); 168 BUG_ON(!list_empty(&bd->bd_ail_gl_list)); 169 lops_init_le(bd, &gfs2_revoke_lops); 170 lops_add(sdp, bd); 171 } 172 173 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len) 174 { 175 struct gfs2_bufdata *bd, *tmp; 176 struct gfs2_trans *tr = current->journal_info; 177 unsigned int n = len; 178 179 gfs2_log_lock(sdp); 180 list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_list) { 181 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) { 182 list_del_init(&bd->bd_list); 183 gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke); 184 sdp->sd_log_num_revoke--; 185 kmem_cache_free(gfs2_bufdata_cachep, bd); 186 tr->tr_num_revoke_rm++; 187 if (--n == 0) 188 break; 189 } 190 } 191 gfs2_log_unlock(sdp); 192 } 193 194