/* * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. * * This copyrighted material is made available to anyone wishing to use, * modify, copy, or redistribute it subject to the terms and conditions * of the GNU General Public License version 2. */ #include <linux/sched.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/completion.h> #include <linux/buffer_head.h> #include <linux/gfs2_ondisk.h> #include <linux/kallsyms.h> #include <linux/lm_interface.h> #include "gfs2.h" #include "incore.h" #include "glock.h" #include "log.h" #include "lops.h" #include "meta_io.h" #include "trans.h" #include "util.h" int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks, unsigned int revokes) { struct gfs2_trans *tr; int error; BUG_ON(current->journal_info); BUG_ON(blocks == 0 && revokes == 0); tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS); if (!tr) return -ENOMEM; tr->tr_ip = (unsigned long)__builtin_return_address(0); tr->tr_blocks = blocks; tr->tr_revokes = revokes; tr->tr_reserved = 1; if (blocks) tr->tr_reserved += 6 + blocks; if (revokes) tr->tr_reserved += gfs2_struct2blk(sdp, revokes, sizeof(u64)); INIT_LIST_HEAD(&tr->tr_list_buf); gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh); error = gfs2_glock_nq(&tr->tr_t_gh); if (error) goto fail_holder_uninit; if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { tr->tr_t_gh.gh_flags |= GL_NOCACHE; error = -EROFS; goto fail_gunlock; } error = gfs2_log_reserve(sdp, tr->tr_reserved); if (error) goto fail_gunlock; current->journal_info = tr; return 0; fail_gunlock: gfs2_glock_dq(&tr->tr_t_gh); fail_holder_uninit: gfs2_holder_uninit(&tr->tr_t_gh); kfree(tr); return error; } void gfs2_trans_end(struct gfs2_sbd *sdp) { struct gfs2_trans *tr = current->journal_info; BUG_ON(!tr); current->journal_info = NULL; if (!tr->tr_touched) { gfs2_log_release(sdp, tr->tr_reserved); gfs2_glock_dq(&tr->tr_t_gh); gfs2_holder_uninit(&tr->tr_t_gh); kfree(tr); return; } if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks)) { fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u ", tr->tr_num_buf, tr->tr_blocks); print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip); } if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes)) { fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u ", tr->tr_num_revoke, tr->tr_revokes); print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip); } gfs2_log_commit(sdp, tr); gfs2_glock_dq(&tr->tr_t_gh); gfs2_holder_uninit(&tr->tr_t_gh); kfree(tr); if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS) gfs2_log_flush(sdp, NULL); } /** * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction * @gl: the glock the buffer belongs to * @bh: The buffer to add * @meta: True in the case of adding metadata * */ void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta) { struct gfs2_sbd *sdp = gl->gl_sbd; struct gfs2_bufdata *bd; bd = bh->b_private; if (bd) gfs2_assert(sdp, bd->bd_gl == gl); else { gfs2_attach_bufdata(gl, bh, meta); bd = bh->b_private; } lops_add(sdp, &bd->bd_le); } void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) { BUG_ON(!list_empty(&bd->bd_le.le_list)); BUG_ON(!list_empty(&bd->bd_ail_st_list)); BUG_ON(!list_empty(&bd->bd_ail_gl_list)); lops_init_le(&bd->bd_le, &gfs2_revoke_lops); lops_add(sdp, &bd->bd_le); } void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len) { struct gfs2_bufdata *bd, *tmp; struct gfs2_trans *tr = current->journal_info; unsigned int n = len; gfs2_log_lock(sdp); list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_le.le_list) { if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) { list_del_init(&bd->bd_le.le_list); gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke); sdp->sd_log_num_revoke--; kmem_cache_free(gfs2_bufdata_cachep, bd); tr->tr_num_revoke_rm++; if (--n == 0) break; } } gfs2_log_unlock(sdp); } void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd) { lops_add(rgd->rd_sbd, &rgd->rd_le); }