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 27 int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks, 28 unsigned int revokes) 29 { 30 struct gfs2_trans *tr; 31 int error; 32 33 BUG_ON(current->journal_info); 34 BUG_ON(blocks == 0 && revokes == 0); 35 36 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) 37 return -EROFS; 38 39 tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS); 40 if (!tr) 41 return -ENOMEM; 42 43 tr->tr_ip = (unsigned long)__builtin_return_address(0); 44 tr->tr_blocks = blocks; 45 tr->tr_revokes = revokes; 46 tr->tr_reserved = 1; 47 if (blocks) 48 tr->tr_reserved += 6 + blocks; 49 if (revokes) 50 tr->tr_reserved += gfs2_struct2blk(sdp, revokes, 51 sizeof(u64)); 52 INIT_LIST_HEAD(&tr->tr_list_buf); 53 54 gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh); 55 56 error = gfs2_glock_nq(&tr->tr_t_gh); 57 if (error) 58 goto fail_holder_uninit; 59 60 error = gfs2_log_reserve(sdp, tr->tr_reserved); 61 if (error) 62 goto fail_gunlock; 63 64 current->journal_info = tr; 65 66 return 0; 67 68 fail_gunlock: 69 gfs2_glock_dq(&tr->tr_t_gh); 70 71 fail_holder_uninit: 72 gfs2_holder_uninit(&tr->tr_t_gh); 73 kfree(tr); 74 75 return error; 76 } 77 78 void gfs2_trans_end(struct gfs2_sbd *sdp) 79 { 80 struct gfs2_trans *tr = current->journal_info; 81 82 BUG_ON(!tr); 83 current->journal_info = NULL; 84 85 if (!tr->tr_touched) { 86 gfs2_log_release(sdp, tr->tr_reserved); 87 if (tr->tr_t_gh.gh_gl) { 88 gfs2_glock_dq(&tr->tr_t_gh); 89 gfs2_holder_uninit(&tr->tr_t_gh); 90 kfree(tr); 91 } 92 return; 93 } 94 95 if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks)) { 96 fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u ", 97 tr->tr_num_buf, tr->tr_blocks); 98 print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip); 99 } 100 if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes)) { 101 fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u ", 102 tr->tr_num_revoke, tr->tr_revokes); 103 print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip); 104 } 105 106 gfs2_log_commit(sdp, tr); 107 if (tr->tr_t_gh.gh_gl) { 108 gfs2_glock_dq(&tr->tr_t_gh); 109 gfs2_holder_uninit(&tr->tr_t_gh); 110 kfree(tr); 111 } 112 113 if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS) 114 gfs2_log_flush(sdp, NULL); 115 } 116 117 /** 118 * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction 119 * @gl: the glock the buffer belongs to 120 * @bh: The buffer to add 121 * @meta: True in the case of adding metadata 122 * 123 */ 124 125 void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta) 126 { 127 struct gfs2_sbd *sdp = gl->gl_sbd; 128 struct gfs2_bufdata *bd; 129 130 bd = bh->b_private; 131 if (bd) 132 gfs2_assert(sdp, bd->bd_gl == gl); 133 else { 134 gfs2_attach_bufdata(gl, bh, meta); 135 bd = bh->b_private; 136 } 137 lops_add(sdp, &bd->bd_le); 138 } 139 140 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) 141 { 142 BUG_ON(!list_empty(&bd->bd_le.le_list)); 143 BUG_ON(!list_empty(&bd->bd_ail_st_list)); 144 BUG_ON(!list_empty(&bd->bd_ail_gl_list)); 145 lops_init_le(&bd->bd_le, &gfs2_revoke_lops); 146 lops_add(sdp, &bd->bd_le); 147 } 148 149 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len) 150 { 151 struct gfs2_bufdata *bd, *tmp; 152 struct gfs2_trans *tr = current->journal_info; 153 unsigned int n = len; 154 155 gfs2_log_lock(sdp); 156 list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_le.le_list) { 157 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) { 158 list_del_init(&bd->bd_le.le_list); 159 gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke); 160 sdp->sd_log_num_revoke--; 161 kmem_cache_free(gfs2_bufdata_cachep, bd); 162 tr->tr_num_revoke_rm++; 163 if (--n == 0) 164 break; 165 } 166 } 167 gfs2_log_unlock(sdp); 168 } 169 170 void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd) 171 { 172 lops_add(rgd->rd_sbd, &rgd->rd_le); 173 } 174 175