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 tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS); 37 if (!tr) 38 return -ENOMEM; 39 40 tr->tr_ip = (unsigned long)__builtin_return_address(0); 41 tr->tr_blocks = blocks; 42 tr->tr_revokes = revokes; 43 tr->tr_reserved = 1; 44 if (blocks) 45 tr->tr_reserved += 6 + blocks; 46 if (revokes) 47 tr->tr_reserved += gfs2_struct2blk(sdp, revokes, 48 sizeof(u64)); 49 INIT_LIST_HEAD(&tr->tr_list_buf); 50 51 gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh); 52 53 error = gfs2_glock_nq(&tr->tr_t_gh); 54 if (error) 55 goto fail_holder_uninit; 56 57 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { 58 tr->tr_t_gh.gh_flags |= GL_NOCACHE; 59 error = -EROFS; 60 goto fail_gunlock; 61 } 62 63 error = gfs2_log_reserve(sdp, tr->tr_reserved); 64 if (error) 65 goto fail_gunlock; 66 67 current->journal_info = tr; 68 69 return 0; 70 71 fail_gunlock: 72 gfs2_glock_dq(&tr->tr_t_gh); 73 74 fail_holder_uninit: 75 gfs2_holder_uninit(&tr->tr_t_gh); 76 kfree(tr); 77 78 return error; 79 } 80 81 void gfs2_trans_end(struct gfs2_sbd *sdp) 82 { 83 struct gfs2_trans *tr = current->journal_info; 84 85 BUG_ON(!tr); 86 current->journal_info = NULL; 87 88 if (!tr->tr_touched) { 89 gfs2_log_release(sdp, tr->tr_reserved); 90 if (tr->tr_t_gh.gh_gl) { 91 gfs2_glock_dq(&tr->tr_t_gh); 92 gfs2_holder_uninit(&tr->tr_t_gh); 93 kfree(tr); 94 } 95 return; 96 } 97 98 if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks)) { 99 fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u ", 100 tr->tr_num_buf, tr->tr_blocks); 101 print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip); 102 } 103 if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes)) { 104 fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u ", 105 tr->tr_num_revoke, tr->tr_revokes); 106 print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip); 107 } 108 109 gfs2_log_commit(sdp, tr); 110 if (tr->tr_t_gh.gh_gl) { 111 gfs2_glock_dq(&tr->tr_t_gh); 112 gfs2_holder_uninit(&tr->tr_t_gh); 113 kfree(tr); 114 } 115 116 if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS) 117 gfs2_log_flush(sdp, NULL); 118 } 119 120 /** 121 * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction 122 * @gl: the glock the buffer belongs to 123 * @bh: The buffer to add 124 * @meta: True in the case of adding metadata 125 * 126 */ 127 128 void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta) 129 { 130 struct gfs2_sbd *sdp = gl->gl_sbd; 131 struct gfs2_bufdata *bd; 132 133 bd = bh->b_private; 134 if (bd) 135 gfs2_assert(sdp, bd->bd_gl == gl); 136 else { 137 gfs2_attach_bufdata(gl, bh, meta); 138 bd = bh->b_private; 139 } 140 lops_add(sdp, &bd->bd_le); 141 } 142 143 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) 144 { 145 BUG_ON(!list_empty(&bd->bd_le.le_list)); 146 BUG_ON(!list_empty(&bd->bd_ail_st_list)); 147 BUG_ON(!list_empty(&bd->bd_ail_gl_list)); 148 lops_init_le(&bd->bd_le, &gfs2_revoke_lops); 149 lops_add(sdp, &bd->bd_le); 150 } 151 152 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len) 153 { 154 struct gfs2_bufdata *bd, *tmp; 155 struct gfs2_trans *tr = current->journal_info; 156 unsigned int n = len; 157 158 gfs2_log_lock(sdp); 159 list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_le.le_list) { 160 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) { 161 list_del_init(&bd->bd_le.le_list); 162 gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke); 163 sdp->sd_log_num_revoke--; 164 kmem_cache_free(gfs2_bufdata_cachep, bd); 165 tr->tr_num_revoke_rm++; 166 if (--n == 0) 167 break; 168 } 169 } 170 gfs2_log_unlock(sdp); 171 } 172 173 void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd) 174 { 175 lops_add(rgd->rd_sbd, &rgd->rd_le); 176 } 177 178