lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 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 | lock_buffer(bh); |
| 149 | gfs2_log_lock(sdp); |
| 150 | bd = bh->b_private; |
| 151 | if (bd) |
| 152 | gfs2_assert(sdp, bd->bd_gl == gl); |
| 153 | else { |
| 154 | gfs2_log_unlock(sdp); |
| 155 | unlock_buffer(bh); |
| 156 | gfs2_attach_bufdata(gl, bh, meta); |
| 157 | bd = bh->b_private; |
| 158 | lock_buffer(bh); |
| 159 | gfs2_log_lock(sdp); |
| 160 | } |
| 161 | lops_add(sdp, &bd->bd_le); |
| 162 | gfs2_log_unlock(sdp); |
| 163 | unlock_buffer(bh); |
| 164 | } |
| 165 | |
| 166 | void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) |
| 167 | { |
| 168 | BUG_ON(!list_empty(&bd->bd_le.le_list)); |
| 169 | BUG_ON(!list_empty(&bd->bd_ail_st_list)); |
| 170 | BUG_ON(!list_empty(&bd->bd_ail_gl_list)); |
| 171 | lops_init_le(&bd->bd_le, &gfs2_revoke_lops); |
| 172 | lops_add(sdp, &bd->bd_le); |
| 173 | } |
| 174 | |
| 175 | void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len) |
| 176 | { |
| 177 | struct gfs2_bufdata *bd, *tmp; |
| 178 | struct gfs2_trans *tr = current->journal_info; |
| 179 | unsigned int n = len; |
| 180 | |
| 181 | gfs2_log_lock(sdp); |
| 182 | list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_le.le_list) { |
| 183 | if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) { |
| 184 | list_del_init(&bd->bd_le.le_list); |
| 185 | gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke); |
| 186 | sdp->sd_log_num_revoke--; |
| 187 | kmem_cache_free(gfs2_bufdata_cachep, bd); |
| 188 | tr->tr_num_revoke_rm++; |
| 189 | if (--n == 0) |
| 190 | break; |
| 191 | } |
| 192 | } |
| 193 | gfs2_log_unlock(sdp); |
| 194 | } |
| 195 | |