diff options
Diffstat (limited to 'fs/gfs2/trans.c')
| -rw-r--r-- | fs/gfs2/trans.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/fs/gfs2/trans.c b/fs/gfs2/trans.c new file mode 100644 index 00000000000..0a0ea70eac4 --- /dev/null +++ b/fs/gfs2/trans.c @@ -0,0 +1,198 @@ +/* + * 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_NOFS); + 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_NOFS); + 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_NOFS | __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); +} + |