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 INIT_LIST_HEAD(&tr->tr_list_buf); 54 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 gfs2_holder_uninit(&tr->tr_t_gh); 74 kfree(tr); 75 76 return error; 77 } 78 79 /** 80 * gfs2_log_release - Release a given number of log blocks 81 * @sdp: The GFS2 superblock 82 * @blks: The number of blocks 83 * 84 */ 85 86 static void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks) 87 { 88 89 atomic_add(blks, &sdp->sd_log_blks_free); 90 trace_gfs2_log_blocks(sdp, blks); 91 gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <= 92 sdp->sd_jdesc->jd_blocks); 93 up_read(&sdp->sd_log_flush_lock); 94 } 95 96 void gfs2_trans_end(struct gfs2_sbd *sdp) 97 { 98 struct gfs2_trans *tr = current->journal_info; 99 100 BUG_ON(!tr); 101 current->journal_info = NULL; 102 103 if (!tr->tr_touched) { 104 gfs2_log_release(sdp, tr->tr_reserved); 105 if (tr->tr_t_gh.gh_gl) { 106 gfs2_glock_dq(&tr->tr_t_gh); 107 gfs2_holder_uninit(&tr->tr_t_gh); 108 kfree(tr); 109 } 110 return; 111 } 112 113 if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks)) { 114 fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u ", 115 tr->tr_num_buf, tr->tr_blocks); 116 print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip); 117 } 118 if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes)) { 119 fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u ", 120 tr->tr_num_revoke, tr->tr_revokes); 121 print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip); 122 } 123 124 gfs2_log_commit(sdp, tr); 125 if (tr->tr_t_gh.gh_gl) { 126 gfs2_glock_dq(&tr->tr_t_gh); 127 gfs2_holder_uninit(&tr->tr_t_gh); 128 kfree(tr); 129 } 130 131 if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS) 132 gfs2_log_flush(sdp, NULL); 133 } 134 135 /** 136 * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction 137 * @gl: the glock the buffer belongs to 138 * @bh: The buffer to add 139 * @meta: True in the case of adding metadata 140 * 141 */ 142 143 void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta) 144 { 145 struct gfs2_sbd *sdp = gl->gl_sbd; 146 struct gfs2_bufdata *bd; 147 148 bd = bh->b_private; 149 if (bd) 150 gfs2_assert(sdp, bd->bd_gl == gl); 151 else { 152 gfs2_attach_bufdata(gl, bh, meta); 153 bd = bh->b_private; 154 } 155 lops_add(sdp, &bd->bd_le); 156 } 157 158 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) 159 { 160 BUG_ON(!list_empty(&bd->bd_le.le_list)); 161 BUG_ON(!list_empty(&bd->bd_ail_st_list)); 162 BUG_ON(!list_empty(&bd->bd_ail_gl_list)); 163 lops_init_le(&bd->bd_le, &gfs2_revoke_lops); 164 lops_add(sdp, &bd->bd_le); 165 } 166 167 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len) 168 { 169 struct gfs2_bufdata *bd, *tmp; 170 struct gfs2_trans *tr = current->journal_info; 171 unsigned int n = len; 172 173 gfs2_log_lock(sdp); 174 list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_le.le_list) { 175 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) { 176 list_del_init(&bd->bd_le.le_list); 177 gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke); 178 sdp->sd_log_num_revoke--; 179 kmem_cache_free(gfs2_bufdata_cachep, bd); 180 tr->tr_num_revoke_rm++; 181 if (--n == 0) 182 break; 183 } 184 } 185 gfs2_log_unlock(sdp); 186 } 187 188