1 /* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2005 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 v.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 <asm/semaphore.h> 16 17 #include "gfs2.h" 18 #include "glock.h" 19 #include "log.h" 20 #include "lops.h" 21 #include "meta_io.h" 22 #include "trans.h" 23 24 int gfs2_trans_begin_i(struct gfs2_sbd *sdp, unsigned int blocks, 25 unsigned int revokes, char *file, unsigned int line) 26 { 27 struct gfs2_trans *tr; 28 int error; 29 30 if (gfs2_assert_warn(sdp, !get_transaction) || 31 gfs2_assert_warn(sdp, blocks || revokes)) { 32 fs_warn(sdp, "(%s, %u)\n", file, line); 33 return -EINVAL; 34 } 35 36 tr = kzalloc(sizeof(struct gfs2_trans), GFP_KERNEL); 37 if (!tr) 38 return -ENOMEM; 39 40 tr->tr_file = file; 41 tr->tr_line = line; 42 tr->tr_blocks = blocks; 43 tr->tr_revokes = revokes; 44 tr->tr_reserved = 1; 45 if (blocks) 46 tr->tr_reserved += 1 + blocks; 47 if (revokes) 48 tr->tr_reserved += gfs2_struct2blk(sdp, revokes, 49 sizeof(uint64_t)); 50 INIT_LIST_HEAD(&tr->tr_list_buf); 51 52 error = -ENOMEM; 53 tr->tr_t_gh = gfs2_holder_get(sdp->sd_trans_gl, LM_ST_SHARED, 54 GL_NEVER_RECURSE, GFP_KERNEL); 55 if (!tr->tr_t_gh) 56 goto fail; 57 58 error = gfs2_glock_nq(tr->tr_t_gh); 59 if (error) 60 goto fail_holder_put; 61 62 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { 63 tr->tr_t_gh->gh_flags |= GL_NOCACHE; 64 error = -EROFS; 65 goto fail_gunlock; 66 } 67 68 error = gfs2_log_reserve(sdp, tr->tr_reserved); 69 if (error) 70 goto fail_gunlock; 71 72 set_transaction(tr); 73 74 return 0; 75 76 fail_gunlock: 77 gfs2_glock_dq(tr->tr_t_gh); 78 79 fail_holder_put: 80 gfs2_holder_put(tr->tr_t_gh); 81 82 fail: 83 kfree(tr); 84 85 return error; 86 } 87 88 void gfs2_trans_end(struct gfs2_sbd *sdp) 89 { 90 struct gfs2_trans *tr; 91 struct gfs2_holder *t_gh; 92 93 tr = get_transaction; 94 set_transaction(NULL); 95 96 if (gfs2_assert_warn(sdp, tr)) 97 return; 98 99 t_gh = tr->tr_t_gh; 100 tr->tr_t_gh = NULL; 101 102 if (!tr->tr_touched) { 103 gfs2_log_release(sdp, tr->tr_reserved); 104 kfree(tr); 105 106 gfs2_glock_dq(t_gh); 107 gfs2_holder_put(t_gh); 108 109 return; 110 } 111 112 if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks)) 113 fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u " 114 "tr_file = %s, tr_line = %u\n", 115 tr->tr_num_buf, tr->tr_blocks, 116 tr->tr_file, tr->tr_line); 117 if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes)) 118 fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u " 119 "tr_file = %s, tr_line = %u\n", 120 tr->tr_num_revoke, tr->tr_revokes, 121 tr->tr_file, tr->tr_line); 122 123 gfs2_log_commit(sdp, tr); 124 125 gfs2_glock_dq(t_gh); 126 gfs2_holder_put(t_gh); 127 128 if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS) 129 gfs2_log_flush(sdp); 130 } 131 132 void gfs2_trans_add_gl(struct gfs2_glock *gl) 133 { 134 lops_add(gl->gl_sbd, &gl->gl_le); 135 } 136 137 /** 138 * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction 139 * @gl: the glock the buffer belongs to 140 * @bh: The buffer to add 141 * @meta: True in the case of adding metadata 142 * 143 */ 144 145 void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta) 146 { 147 struct gfs2_sbd *sdp = gl->gl_sbd; 148 struct gfs2_bufdata *bd; 149 150 bd = get_v2bd(bh); 151 if (bd) 152 gfs2_assert(sdp, bd->bd_gl == gl); 153 else { 154 gfs2_attach_bufdata(gl, bh, meta); 155 bd = get_v2bd(bh); 156 } 157 lops_add(sdp, &bd->bd_le); 158 } 159 160 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, uint64_t blkno) 161 { 162 struct gfs2_revoke *rv = kmalloc(sizeof(struct gfs2_revoke), 163 GFP_NOFS | __GFP_NOFAIL); 164 lops_init_le(&rv->rv_le, &gfs2_revoke_lops); 165 rv->rv_blkno = blkno; 166 lops_add(sdp, &rv->rv_le); 167 } 168 169 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, uint64_t blkno) 170 { 171 struct gfs2_revoke *rv; 172 int found = 0; 173 174 gfs2_log_lock(sdp); 175 176 list_for_each_entry(rv, &sdp->sd_log_le_revoke, rv_le.le_list) { 177 if (rv->rv_blkno == blkno) { 178 list_del(&rv->rv_le.le_list); 179 gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke); 180 sdp->sd_log_num_revoke--; 181 found = 1; 182 break; 183 } 184 } 185 186 gfs2_log_unlock(sdp); 187 188 if (found) { 189 kfree(rv); 190 get_transaction->tr_num_revoke_rm++; 191 } 192 } 193 194 void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd) 195 { 196 lops_add(rgd->rd_sbd, &rgd->rd_le); 197 } 198 199