| /* |
| * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
| * Copyright (C) 2004-2005 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 v.2. |
| */ |
| |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/completion.h> |
| #include <linux/buffer_head.h> |
| #include <asm/semaphore.h> |
| |
| #include "gfs2.h" |
| #include "glock.h" |
| #include "log.h" |
| #include "lops.h" |
| #include "meta_io.h" |
| #include "trans.h" |
| |
| int gfs2_trans_begin_i(struct gfs2_sbd *sdp, unsigned int blocks, |
| unsigned int revokes, char *file, unsigned int line) |
| { |
| struct gfs2_trans *tr; |
| int error; |
| |
| if (gfs2_assert_warn(sdp, !get_transaction) || |
| gfs2_assert_warn(sdp, blocks || revokes)) { |
| fs_warn(sdp, "(%s, %u)\n", file, line); |
| return -EINVAL; |
| } |
| |
| tr = kzalloc(sizeof(struct gfs2_trans), GFP_KERNEL); |
| if (!tr) |
| return -ENOMEM; |
| |
| tr->tr_file = file; |
| tr->tr_line = line; |
| tr->tr_blocks = blocks; |
| tr->tr_revokes = revokes; |
| tr->tr_reserved = 1; |
| if (blocks) |
| tr->tr_reserved += 1 + blocks; |
| if (revokes) |
| tr->tr_reserved += gfs2_struct2blk(sdp, revokes, |
| sizeof(uint64_t)); |
| INIT_LIST_HEAD(&tr->tr_list_buf); |
| |
| error = -ENOMEM; |
| tr->tr_t_gh = gfs2_holder_get(sdp->sd_trans_gl, LM_ST_SHARED, |
| GL_NEVER_RECURSE, GFP_KERNEL); |
| if (!tr->tr_t_gh) |
| goto fail; |
| |
| error = gfs2_glock_nq(tr->tr_t_gh); |
| if (error) |
| goto fail_holder_put; |
| |
| 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; |
| |
| set_transaction(tr); |
| |
| return 0; |
| |
| fail_gunlock: |
| gfs2_glock_dq(tr->tr_t_gh); |
| |
| fail_holder_put: |
| gfs2_holder_put(tr->tr_t_gh); |
| |
| fail: |
| kfree(tr); |
| |
| return error; |
| } |
| |
| void gfs2_trans_end(struct gfs2_sbd *sdp) |
| { |
| struct gfs2_trans *tr; |
| struct gfs2_holder *t_gh; |
| |
| tr = get_transaction; |
| set_transaction(NULL); |
| |
| if (gfs2_assert_warn(sdp, tr)) |
| return; |
| |
| t_gh = tr->tr_t_gh; |
| tr->tr_t_gh = NULL; |
| |
| if (!tr->tr_touched) { |
| gfs2_log_release(sdp, tr->tr_reserved); |
| kfree(tr); |
| |
| gfs2_glock_dq(t_gh); |
| gfs2_holder_put(t_gh); |
| |
| return; |
| } |
| |
| if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks)) |
| fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u " |
| "tr_file = %s, tr_line = %u\n", |
| tr->tr_num_buf, tr->tr_blocks, |
| tr->tr_file, tr->tr_line); |
| if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes)) |
| fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u " |
| "tr_file = %s, tr_line = %u\n", |
| tr->tr_num_revoke, tr->tr_revokes, |
| tr->tr_file, tr->tr_line); |
| |
| gfs2_log_commit(sdp, tr); |
| |
| gfs2_glock_dq(t_gh); |
| gfs2_holder_put(t_gh); |
| |
| if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS) |
| gfs2_log_flush(sdp); |
| } |
| |
| void gfs2_trans_add_gl(struct gfs2_glock *gl) |
| { |
| lops_add(gl->gl_sbd, &gl->gl_le); |
| } |
| |
| /** |
| * 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 = get_v2bd(bh); |
| if (bd) |
| gfs2_assert(sdp, bd->bd_gl == gl); |
| else { |
| gfs2_attach_bufdata(gl, bh, meta); |
| bd = get_v2bd(bh); |
| } |
| |
| lops_add(sdp, &bd->bd_le); |
| } |
| |
| void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, uint64_t blkno) |
| { |
| struct gfs2_revoke *rv = kmalloc(sizeof(struct gfs2_revoke), |
| GFP_KERNEL | __GFP_NOFAIL); |
| lops_init_le(&rv->rv_le, &gfs2_revoke_lops); |
| rv->rv_blkno = blkno; |
| lops_add(sdp, &rv->rv_le); |
| } |
| |
| void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, uint64_t blkno) |
| { |
| struct gfs2_revoke *rv; |
| int found = 0; |
| |
| gfs2_log_lock(sdp); |
| |
| list_for_each_entry(rv, &sdp->sd_log_le_revoke, rv_le.le_list) { |
| if (rv->rv_blkno == blkno) { |
| list_del(&rv->rv_le.le_list); |
| gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke); |
| sdp->sd_log_num_revoke--; |
| found = 1; |
| break; |
| } |
| } |
| |
| gfs2_log_unlock(sdp); |
| |
| if (found) { |
| kfree(rv); |
| get_transaction->tr_num_revoke_rm++; |
| } |
| } |
| |
| void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd) |
| { |
| lops_add(rgd->rd_sbd, &rgd->rd_le); |
| } |
| |
| void gfs2_trans_add_databuf(struct gfs2_sbd *sdp, struct buffer_head *bh) |
| { |
| struct gfs2_bufdata *bd; |
| |
| bd = get_v2bd(bh); |
| if (!bd) { |
| bd = kmalloc(sizeof(struct gfs2_bufdata), |
| GFP_NOFS | __GFP_NOFAIL); |
| lops_init_le(&bd->bd_le, &gfs2_databuf_lops); |
| get_bh(bh); |
| bd->bd_bh = bh; |
| set_v2bd(bh, bd); |
| lops_add(sdp, &bd->bd_le); |
| } |
| } |
| |