1b3b94faaSDavid Teigland /* 2b3b94faaSDavid Teigland * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 33a8a9a10SSteven Whitehouse * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 4b3b94faaSDavid Teigland * 5b3b94faaSDavid Teigland * This copyrighted material is made available to anyone wishing to use, 6b3b94faaSDavid Teigland * modify, copy, or redistribute it subject to the terms and conditions 7e9fc2aa0SSteven Whitehouse * of the GNU General Public License version 2. 8b3b94faaSDavid Teigland */ 9b3b94faaSDavid Teigland 10b3b94faaSDavid Teigland #include <linux/sched.h> 11b3b94faaSDavid Teigland #include <linux/slab.h> 12b3b94faaSDavid Teigland #include <linux/spinlock.h> 13b3b94faaSDavid Teigland #include <linux/completion.h> 14b3b94faaSDavid Teigland #include <linux/buffer_head.h> 15d0dc80dbSSteven Whitehouse #include <linux/kallsyms.h> 16f057f6cdSSteven Whitehouse #include <linux/gfs2_ondisk.h> 17b3b94faaSDavid Teigland 18b3b94faaSDavid Teigland #include "gfs2.h" 195c676f6dSSteven Whitehouse #include "incore.h" 20b3b94faaSDavid Teigland #include "glock.h" 21b3b94faaSDavid Teigland #include "log.h" 22b3b94faaSDavid Teigland #include "lops.h" 23b3b94faaSDavid Teigland #include "meta_io.h" 24b3b94faaSDavid Teigland #include "trans.h" 255c676f6dSSteven Whitehouse #include "util.h" 265e687eacSBenjamin Marzinski #include "trace_gfs2.h" 27b3b94faaSDavid Teigland 28d0dc80dbSSteven Whitehouse int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks, 29d0dc80dbSSteven Whitehouse unsigned int revokes) 30b3b94faaSDavid Teigland { 31b3b94faaSDavid Teigland struct gfs2_trans *tr; 32b3b94faaSDavid Teigland int error; 33b3b94faaSDavid Teigland 34d0dc80dbSSteven Whitehouse BUG_ON(current->journal_info); 35d0dc80dbSSteven Whitehouse BUG_ON(blocks == 0 && revokes == 0); 36b3b94faaSDavid Teigland 37a1c0643fSSteven Whitehouse if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) 38a1c0643fSSteven Whitehouse return -EROFS; 39a1c0643fSSteven Whitehouse 40f55ab26aSSteven Whitehouse tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS); 41b3b94faaSDavid Teigland if (!tr) 42b3b94faaSDavid Teigland return -ENOMEM; 43b3b94faaSDavid Teigland 44d0dc80dbSSteven Whitehouse tr->tr_ip = (unsigned long)__builtin_return_address(0); 45b3b94faaSDavid Teigland tr->tr_blocks = blocks; 46b3b94faaSDavid Teigland tr->tr_revokes = revokes; 47b3b94faaSDavid Teigland tr->tr_reserved = 1; 48b3b94faaSDavid Teigland if (blocks) 49f4154ea0SSteven Whitehouse tr->tr_reserved += 6 + blocks; 50b3b94faaSDavid Teigland if (revokes) 51b3b94faaSDavid Teigland tr->tr_reserved += gfs2_struct2blk(sdp, revokes, 52cd915493SSteven Whitehouse sizeof(u64)); 5339263d5eSJan Kara sb_start_intwrite(sdp->sd_vfs); 54579b78a4SSteven Whitehouse gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh); 55b3b94faaSDavid Teigland 56e317ffcbSSteven Whitehouse error = gfs2_glock_nq(&tr->tr_t_gh); 57b3b94faaSDavid Teigland if (error) 58e317ffcbSSteven Whitehouse goto fail_holder_uninit; 59b3b94faaSDavid Teigland 60b3b94faaSDavid Teigland error = gfs2_log_reserve(sdp, tr->tr_reserved); 61b3b94faaSDavid Teigland if (error) 62b3b94faaSDavid Teigland goto fail_gunlock; 63b3b94faaSDavid Teigland 645c676f6dSSteven Whitehouse current->journal_info = tr; 65b3b94faaSDavid Teigland 66b3b94faaSDavid Teigland return 0; 67b3b94faaSDavid Teigland 68b3b94faaSDavid Teigland fail_gunlock: 69e317ffcbSSteven Whitehouse gfs2_glock_dq(&tr->tr_t_gh); 70b3b94faaSDavid Teigland 71e317ffcbSSteven Whitehouse fail_holder_uninit: 7239263d5eSJan Kara sb_end_intwrite(sdp->sd_vfs); 73e317ffcbSSteven Whitehouse gfs2_holder_uninit(&tr->tr_t_gh); 74b3b94faaSDavid Teigland kfree(tr); 75b3b94faaSDavid Teigland 76b3b94faaSDavid Teigland return error; 77b3b94faaSDavid Teigland } 78b3b94faaSDavid Teigland 795e687eacSBenjamin Marzinski /** 805e687eacSBenjamin Marzinski * gfs2_log_release - Release a given number of log blocks 815e687eacSBenjamin Marzinski * @sdp: The GFS2 superblock 825e687eacSBenjamin Marzinski * @blks: The number of blocks 835e687eacSBenjamin Marzinski * 845e687eacSBenjamin Marzinski */ 855e687eacSBenjamin Marzinski 865e687eacSBenjamin Marzinski static void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks) 875e687eacSBenjamin Marzinski { 885e687eacSBenjamin Marzinski 895e687eacSBenjamin Marzinski atomic_add(blks, &sdp->sd_log_blks_free); 905e687eacSBenjamin Marzinski trace_gfs2_log_blocks(sdp, blks); 915e687eacSBenjamin Marzinski gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <= 925e687eacSBenjamin Marzinski sdp->sd_jdesc->jd_blocks); 935e687eacSBenjamin Marzinski up_read(&sdp->sd_log_flush_lock); 945e687eacSBenjamin Marzinski } 955e687eacSBenjamin Marzinski 96c50b91c4SSteven Whitehouse static void gfs2_print_trans(const struct gfs2_trans *tr) 97c50b91c4SSteven Whitehouse { 98c50b91c4SSteven Whitehouse print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip); 99c50b91c4SSteven Whitehouse printk(KERN_WARNING "GFS2: blocks=%u revokes=%u reserved=%u touched=%d\n", 100c50b91c4SSteven Whitehouse tr->tr_blocks, tr->tr_revokes, tr->tr_reserved, tr->tr_touched); 101c50b91c4SSteven Whitehouse printk(KERN_WARNING "GFS2: Buf %u/%u Databuf %u/%u Revoke %u/%u\n", 102c50b91c4SSteven Whitehouse tr->tr_num_buf_new, tr->tr_num_buf_rm, 103c50b91c4SSteven Whitehouse tr->tr_num_databuf_new, tr->tr_num_databuf_rm, 104c50b91c4SSteven Whitehouse tr->tr_num_revoke, tr->tr_num_revoke_rm); 105c50b91c4SSteven Whitehouse } 106c50b91c4SSteven Whitehouse 107b3b94faaSDavid Teigland void gfs2_trans_end(struct gfs2_sbd *sdp) 108b3b94faaSDavid Teigland { 109f4154ea0SSteven Whitehouse struct gfs2_trans *tr = current->journal_info; 110c50b91c4SSteven Whitehouse s64 nbuf; 111f4154ea0SSteven Whitehouse BUG_ON(!tr); 1125c676f6dSSteven Whitehouse current->journal_info = NULL; 113b3b94faaSDavid Teigland 114b3b94faaSDavid Teigland if (!tr->tr_touched) { 115b3b94faaSDavid Teigland gfs2_log_release(sdp, tr->tr_reserved); 116d8348de0SSteven Whitehouse if (tr->tr_t_gh.gh_gl) { 117b4dc7291SSteven Whitehouse gfs2_glock_dq(&tr->tr_t_gh); 118b4dc7291SSteven Whitehouse gfs2_holder_uninit(&tr->tr_t_gh); 119e317ffcbSSteven Whitehouse kfree(tr); 120d8348de0SSteven Whitehouse } 12139263d5eSJan Kara sb_end_intwrite(sdp->sd_vfs); 122b3b94faaSDavid Teigland return; 123b3b94faaSDavid Teigland } 124b3b94faaSDavid Teigland 125c50b91c4SSteven Whitehouse nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new; 126c50b91c4SSteven Whitehouse nbuf -= tr->tr_num_buf_rm; 127c50b91c4SSteven Whitehouse nbuf -= tr->tr_num_databuf_rm; 128c50b91c4SSteven Whitehouse 129c50b91c4SSteven Whitehouse if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) && 130c50b91c4SSteven Whitehouse (tr->tr_num_revoke <= tr->tr_revokes))) 131c50b91c4SSteven Whitehouse gfs2_print_trans(tr); 132b3b94faaSDavid Teigland 133b3b94faaSDavid Teigland gfs2_log_commit(sdp, tr); 134d8348de0SSteven Whitehouse if (tr->tr_t_gh.gh_gl) { 135b4dc7291SSteven Whitehouse gfs2_glock_dq(&tr->tr_t_gh); 136b4dc7291SSteven Whitehouse gfs2_holder_uninit(&tr->tr_t_gh); 137b4dc7291SSteven Whitehouse kfree(tr); 138d8348de0SSteven Whitehouse } 139b3b94faaSDavid Teigland 140b3b94faaSDavid Teigland if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS) 141b09e593dSSteven Whitehouse gfs2_log_flush(sdp, NULL); 14239263d5eSJan Kara sb_end_intwrite(sdp->sd_vfs); 143b3b94faaSDavid Teigland } 144b3b94faaSDavid Teigland 145b3b94faaSDavid Teigland /** 146b3b94faaSDavid Teigland * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction 147b3b94faaSDavid Teigland * @gl: the glock the buffer belongs to 148b3b94faaSDavid Teigland * @bh: The buffer to add 149d4e9c4c3SSteven Whitehouse * @meta: True in the case of adding metadata 150b3b94faaSDavid Teigland * 151b3b94faaSDavid Teigland */ 152b3b94faaSDavid Teigland 153*350a9b0aSSteven Whitehouse static void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta) 154b3b94faaSDavid Teigland { 155b3b94faaSDavid Teigland struct gfs2_sbd *sdp = gl->gl_sbd; 156b3b94faaSDavid Teigland struct gfs2_bufdata *bd; 157b3b94faaSDavid Teigland 15896e5d1d3SBenjamin Marzinski lock_buffer(bh); 15996e5d1d3SBenjamin Marzinski gfs2_log_lock(sdp); 1605c676f6dSSteven Whitehouse bd = bh->b_private; 161b3b94faaSDavid Teigland if (bd) 162b3b94faaSDavid Teigland gfs2_assert(sdp, bd->bd_gl == gl); 163b3b94faaSDavid Teigland else { 16496e5d1d3SBenjamin Marzinski gfs2_log_unlock(sdp); 16596e5d1d3SBenjamin Marzinski unlock_buffer(bh); 166586dfdaaSSteven Whitehouse gfs2_attach_bufdata(gl, bh, meta); 1675c676f6dSSteven Whitehouse bd = bh->b_private; 16896e5d1d3SBenjamin Marzinski lock_buffer(bh); 16996e5d1d3SBenjamin Marzinski gfs2_log_lock(sdp); 170b3b94faaSDavid Teigland } 171c0752aa7SBob Peterson lops_add(sdp, bd); 17296e5d1d3SBenjamin Marzinski gfs2_log_unlock(sdp); 17396e5d1d3SBenjamin Marzinski unlock_buffer(bh); 174b3b94faaSDavid Teigland } 175b3b94faaSDavid Teigland 176*350a9b0aSSteven Whitehouse void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh) 177*350a9b0aSSteven Whitehouse { 178*350a9b0aSSteven Whitehouse return gfs2_trans_add_bh(gl, bh, 0); 179*350a9b0aSSteven Whitehouse } 180*350a9b0aSSteven Whitehouse 181*350a9b0aSSteven Whitehouse void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh) 182*350a9b0aSSteven Whitehouse { 183*350a9b0aSSteven Whitehouse return gfs2_trans_add_bh(gl, bh, 1); 184*350a9b0aSSteven Whitehouse } 185*350a9b0aSSteven Whitehouse 1861ad38c43SSteven Whitehouse void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) 187b3b94faaSDavid Teigland { 18875f2b879SSteven Whitehouse struct gfs2_glock *gl = bd->bd_gl; 18975f2b879SSteven Whitehouse struct gfs2_trans *tr = current->journal_info; 19075f2b879SSteven Whitehouse 191c0752aa7SBob Peterson BUG_ON(!list_empty(&bd->bd_list)); 1921ad38c43SSteven Whitehouse BUG_ON(!list_empty(&bd->bd_ail_st_list)); 1931ad38c43SSteven Whitehouse BUG_ON(!list_empty(&bd->bd_ail_gl_list)); 194c0752aa7SBob Peterson lops_init_le(bd, &gfs2_revoke_lops); 19575f2b879SSteven Whitehouse tr->tr_touched = 1; 19675f2b879SSteven Whitehouse tr->tr_num_revoke++; 19775f2b879SSteven Whitehouse sdp->sd_log_num_revoke++; 19875f2b879SSteven Whitehouse atomic_inc(&gl->gl_revokes); 19975f2b879SSteven Whitehouse set_bit(GLF_LFLUSH, &gl->gl_flags); 20075f2b879SSteven Whitehouse list_add(&bd->bd_list, &sdp->sd_log_le_revoke); 201b3b94faaSDavid Teigland } 202b3b94faaSDavid Teigland 2035731be53SSteven Whitehouse void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len) 204b3b94faaSDavid Teigland { 2055731be53SSteven Whitehouse struct gfs2_bufdata *bd, *tmp; 2065731be53SSteven Whitehouse struct gfs2_trans *tr = current->journal_info; 2075731be53SSteven Whitehouse unsigned int n = len; 208b3b94faaSDavid Teigland 209b3b94faaSDavid Teigland gfs2_log_lock(sdp); 210c0752aa7SBob Peterson list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_list) { 2115731be53SSteven Whitehouse if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) { 212c0752aa7SBob Peterson list_del_init(&bd->bd_list); 213b3b94faaSDavid Teigland gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke); 214b3b94faaSDavid Teigland sdp->sd_log_num_revoke--; 2155731be53SSteven Whitehouse kmem_cache_free(gfs2_bufdata_cachep, bd); 2165731be53SSteven Whitehouse tr->tr_num_revoke_rm++; 2175731be53SSteven Whitehouse if (--n == 0) 218b3b94faaSDavid Teigland break; 219b3b94faaSDavid Teigland } 220b3b94faaSDavid Teigland } 221b3b94faaSDavid Teigland gfs2_log_unlock(sdp); 222b3b94faaSDavid Teigland } 223b3b94faaSDavid Teigland 224