[GFS2] The core of GFS2

This patch contains all the core files for GFS2.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 534 insertions, 0 deletions

diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
new file mode 100644
index 000000000000..d501e8224ed0
--- /dev/null
+++ b/fs/gfs2/lops.c
@@ -0,0 +1,534 @@
+/*
+ * 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 "recovery.h"
+#include "rgrp.h"
+#include "trans.h"
+
+static void glock_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
+{
+        struct gfs2_glock *gl;
+
+        get_transaction->tr_touched = 1;
+
+        if (!list_empty(&le->le_list))
+                return;
+
+        gl = container_of(le, struct gfs2_glock, gl_le);
+        if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(gl)))
+                return;
+        gfs2_glock_hold(gl);
+        set_bit(GLF_DIRTY, &gl->gl_flags);
+
+        gfs2_log_lock(sdp);
+        sdp->sd_log_num_gl++;
+        list_add(&le->le_list, &sdp->sd_log_le_gl);
+        gfs2_log_unlock(sdp);
+}
+
+static void glock_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
+{
+        struct list_head *head = &sdp->sd_log_le_gl;
+        struct gfs2_glock *gl;
+
+        while (!list_empty(head)) {
+                gl = list_entry(head->next, struct gfs2_glock, gl_le.le_list);
+                list_del_init(&gl->gl_le.le_list);
+                sdp->sd_log_num_gl--;
+
+                gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(gl));
+                gfs2_glock_put(gl);
+        }
+        gfs2_assert_warn(sdp, !sdp->sd_log_num_gl);
+}
+
+static void buf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
+{
+        struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
+        struct gfs2_trans *tr;
+
+        if (!list_empty(&bd->bd_list_tr))
+                return;
+
+        tr = get_transaction;
+        tr->tr_touched = 1;
+        tr->tr_num_buf++;
+        list_add(&bd->bd_list_tr, &tr->tr_list_buf);
+
+        if (!list_empty(&le->le_list))
+                return;
+
+        gfs2_trans_add_gl(bd->bd_gl);
+
+        gfs2_meta_check(sdp, bd->bd_bh);
+        gfs2_meta_pin(sdp, bd->bd_bh);
+
+        gfs2_log_lock(sdp);
+        sdp->sd_log_num_buf++;
+        list_add(&le->le_list, &sdp->sd_log_le_buf);
+        gfs2_log_unlock(sdp);
+
+        tr->tr_num_buf_new++;
+}
+
+static void buf_lo_incore_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
+{
+        struct list_head *head = &tr->tr_list_buf;
+        struct gfs2_bufdata *bd;
+
+        while (!list_empty(head)) {
+                bd = list_entry(head->next, struct gfs2_bufdata, bd_list_tr);
+                list_del_init(&bd->bd_list_tr);
+                tr->tr_num_buf--;
+        }
+        gfs2_assert_warn(sdp, !tr->tr_num_buf);
+}
+
+static void buf_lo_before_commit(struct gfs2_sbd *sdp)
+{
+        struct buffer_head *bh;
+        struct gfs2_log_descriptor *ld;
+        struct gfs2_bufdata *bd1 = NULL, *bd2;
+        unsigned int total = sdp->sd_log_num_buf;
+        unsigned int offset = sizeof(struct gfs2_log_descriptor);
+        unsigned int limit;
+        unsigned int num;
+        unsigned n;
+        __be64 *ptr;
+
+        offset += (sizeof(__be64) - 1);
+        offset &= ~(sizeof(__be64) - 1);
+        limit = (sdp->sd_sb.sb_bsize - offset)/sizeof(__be64);
+        /* for 4k blocks, limit = 503 */
+
+        bd1 = bd2 = list_prepare_entry(bd1, &sdp->sd_log_le_buf, bd_le.le_list);
+        while(total) {
+                num = total;
+                if (total > limit)
+                        num = limit;
+                bh = gfs2_log_get_buf(sdp);
+                ld = (struct gfs2_log_descriptor *)bh->b_data;
+                ptr = (__be64 *)(bh->b_data + offset);
+                ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
+                ld->ld_header.mh_type = cpu_to_be16(GFS2_METATYPE_LD);
+                ld->ld_header.mh_format = cpu_to_be16(GFS2_FORMAT_LD);
+                ld->ld_type = cpu_to_be32(GFS2_LOG_DESC_METADATA);
+                ld->ld_length = cpu_to_be32(num + 1);
+                ld->ld_data1 = cpu_to_be32(num);
+                ld->ld_data2 = cpu_to_be32(0);
+                memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
+
+                n = 0;
+                list_for_each_entry_continue(bd1, &sdp->sd_log_le_buf, bd_le.le_list) {
+                        *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
+                        if (++n >= num)
+                                break;
+                }
+
+                set_buffer_dirty(bh);
+                ll_rw_block(WRITE, 1, &bh);
+
+                n = 0;
+                list_for_each_entry_continue(bd2, &sdp->sd_log_le_buf, bd_le.le_list) {
+                        bh = gfs2_log_fake_buf(sdp, bd2->bd_bh);
+                        set_buffer_dirty(bh);
+                        ll_rw_block(WRITE, 1, &bh);
+                        if (++n >= num)
+                                break;
+                }
+
+                total -= num;
+        }
+}
+
+static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
+{
+        struct list_head *head = &sdp->sd_log_le_buf;
+        struct gfs2_bufdata *bd;
+
+        while (!list_empty(head)) {
+                bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
+                list_del_init(&bd->bd_le.le_list);
+                sdp->sd_log_num_buf--;
+
+                gfs2_meta_unpin(sdp, bd->bd_bh, ai);
+        }
+        gfs2_assert_warn(sdp, !sdp->sd_log_num_buf);
+}
+
+static void buf_lo_before_scan(struct gfs2_jdesc *jd,
+                               struct gfs2_log_header *head, int pass)
+{
+        struct gfs2_sbd *sdp = jd->jd_inode->i_sbd;
+
+        if (pass != 0)
+                return;
+
+        sdp->sd_found_blocks = 0;
+        sdp->sd_replayed_blocks = 0;
+}
+
+static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
+                                struct gfs2_log_descriptor *ld, __be64 *ptr,
+                                int pass)
+{
+        struct gfs2_sbd *sdp = jd->jd_inode->i_sbd;
+        struct gfs2_glock *gl = jd->jd_inode->i_gl;
+        unsigned int blks = be32_to_cpu(ld->ld_data1);
+        struct buffer_head *bh_log, *bh_ip;
+        uint64_t blkno;
+        int error = 0;
+
+        if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA)
+                return 0;
+
+        gfs2_replay_incr_blk(sdp, &start);
+
+        for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
+                blkno = be64_to_cpu(*ptr++);
+
+                sdp->sd_found_blocks++;
+
+                if (gfs2_revoke_check(sdp, blkno, start))
+                        continue;
+
+                error = gfs2_replay_read_block(jd, start, &bh_log);
+                if (error)
+                        return error;
+
+                bh_ip = gfs2_meta_new(gl, blkno);
+                memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
+
+                if (gfs2_meta_check(sdp, bh_ip))
+                        error = -EIO;
+                else
+                        mark_buffer_dirty(bh_ip);
+
+                brelse(bh_log);
+                brelse(bh_ip);
+
+                if (error)
+                        break;
+
+                sdp->sd_replayed_blocks++;
+        }
+
+        return error;
+}
+
+static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
+{
+        struct gfs2_sbd *sdp = jd->jd_inode->i_sbd;
+
+        if (error) {
+                gfs2_meta_sync(jd->jd_inode->i_gl, DIO_START | DIO_WAIT);
+                return;
+        }
+        if (pass != 1)
+                return;
+
+        gfs2_meta_sync(jd->jd_inode->i_gl, DIO_START | DIO_WAIT);
+
+        fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n",
+                jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
+}
+
+static void revoke_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
+{
+        struct gfs2_trans *tr;
+
+        tr = get_transaction;
+        tr->tr_touched = 1;
+        tr->tr_num_revoke++;
+
+        gfs2_log_lock(sdp);
+        sdp->sd_log_num_revoke++;
+        list_add(&le->le_list, &sdp->sd_log_le_revoke);
+        gfs2_log_unlock(sdp);
+}
+
+static void revoke_lo_before_commit(struct gfs2_sbd *sdp)
+{
+        struct gfs2_log_descriptor *ld;
+        struct gfs2_meta_header *mh;
+        struct buffer_head *bh;
+        unsigned int offset;
+        struct list_head *head = &sdp->sd_log_le_revoke;
+        struct gfs2_revoke *rv;
+
+        if (!sdp->sd_log_num_revoke)
+                return;
+
+        bh = gfs2_log_get_buf(sdp);
+        ld = (struct gfs2_log_descriptor *)bh->b_data;
+        ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
+        ld->ld_header.mh_type = cpu_to_be16(GFS2_METATYPE_LD);
+        ld->ld_header.mh_format = cpu_to_be16(GFS2_FORMAT_LD);
+        ld->ld_type = cpu_to_be32(GFS2_LOG_DESC_REVOKE);
+        ld->ld_length = cpu_to_be32(gfs2_struct2blk(sdp, sdp->sd_log_num_revoke, sizeof(uint64_t)));
+        ld->ld_data1 = cpu_to_be32(sdp->sd_log_num_revoke);
+        ld->ld_data2 = cpu_to_be32(0);
+        memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
+        offset = sizeof(struct gfs2_log_descriptor);
+
+        while (!list_empty(head)) {
+                rv = list_entry(head->next, struct gfs2_revoke, rv_le.le_list);
+                list_del(&rv->rv_le.le_list);
+                sdp->sd_log_num_revoke--;
+
+                if (offset + sizeof(uint64_t) > sdp->sd_sb.sb_bsize) {
+                        set_buffer_dirty(bh);
+                        ll_rw_block(WRITE, 1, &bh);
+
+                        bh = gfs2_log_get_buf(sdp);
+                        mh = (struct gfs2_meta_header *)bh->b_data;
+                        mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
+                        mh->mh_type = cpu_to_be16(GFS2_METATYPE_LB);
+                        mh->mh_format = cpu_to_be16(GFS2_FORMAT_LB);
+                        offset = sizeof(struct gfs2_meta_header);
+                }
+
+                *(__be64 *)(bh->b_data + offset) = cpu_to_be64(rv->rv_blkno);
+                kfree(rv);
+
+                offset += sizeof(uint64_t);
+        }
+        gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
+
+        set_buffer_dirty(bh);
+        ll_rw_block(WRITE, 1, &bh);
+}
+
+static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
+                                  struct gfs2_log_header *head, int pass)
+{
+        struct gfs2_sbd *sdp = jd->jd_inode->i_sbd;
+
+        if (pass != 0)
+                return;
+
+        sdp->sd_found_revokes = 0;
+        sdp->sd_replay_tail = head->lh_tail;
+}
+
+static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
+                                   struct gfs2_log_descriptor *ld, __be64 *ptr,
+                                   int pass)
+{
+        struct gfs2_sbd *sdp = jd->jd_inode->i_sbd;
+        unsigned int blks = be32_to_cpu(ld->ld_length);
+        unsigned int revokes = be32_to_cpu(ld->ld_data1);
+        struct buffer_head *bh;
+        unsigned int offset;
+        uint64_t blkno;
+        int first = 1;
+        int error;
+
+        if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE)
+                return 0;
+
+        offset = sizeof(struct gfs2_log_descriptor);
+
+        for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
+                error = gfs2_replay_read_block(jd, start, &bh);
+                if (error)
+                        return error;
+
+                if (!first)
+                        gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB);
+
+                while (offset + sizeof(uint64_t) <= sdp->sd_sb.sb_bsize) {
+                        blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset));
+
+                        error = gfs2_revoke_add(sdp, blkno, start);
+                        if (error < 0)
+                                return error;
+                        else if (error)
+                                sdp->sd_found_revokes++;
+
+                        if (!--revokes)
+                                break;
+                        offset += sizeof(uint64_t);
+                }
+
+                brelse(bh);
+                offset = sizeof(struct gfs2_meta_header);
+                first = 0;
+        }
+
+        return 0;
+}
+
+static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
+{
+        struct gfs2_sbd *sdp = jd->jd_inode->i_sbd;
+
+        if (error) {
+                gfs2_revoke_clean(sdp);
+                return;
+        }
+        if (pass != 1)
+                return;
+
+        fs_info(sdp, "jid=%u: Found %u revoke tags\n",
+                jd->jd_jid, sdp->sd_found_revokes);
+
+        gfs2_revoke_clean(sdp);
+}
+
+static void rg_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
+{
+        struct gfs2_rgrpd *rgd;
+
+        get_transaction->tr_touched = 1;
+
+        if (!list_empty(&le->le_list))
+                return;
+
+        rgd = container_of(le, struct gfs2_rgrpd, rd_le);
+        gfs2_rgrp_bh_hold(rgd);
+
+        gfs2_log_lock(sdp);
+        sdp->sd_log_num_rg++;
+        list_add(&le->le_list, &sdp->sd_log_le_rg);
+        gfs2_log_unlock(sdp);   
+}
+
+static void rg_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
+{
+        struct list_head *head = &sdp->sd_log_le_rg;
+        struct gfs2_rgrpd *rgd;
+
+        while (!list_empty(head)) {
+                rgd = list_entry(head->next, struct gfs2_rgrpd, rd_le.le_list);
+                list_del_init(&rgd->rd_le.le_list);
+                sdp->sd_log_num_rg--;
+
+                gfs2_rgrp_repolish_clones(rgd);
+                gfs2_rgrp_bh_put(rgd);
+        }
+        gfs2_assert_warn(sdp, !sdp->sd_log_num_rg);
+}
+
+static void databuf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
+{
+        get_transaction->tr_touched = 1;
+
+        gfs2_log_lock(sdp);
+        sdp->sd_log_num_databuf++;
+        list_add(&le->le_list, &sdp->sd_log_le_databuf);
+        gfs2_log_unlock(sdp);
+}
+
+static void databuf_lo_before_commit(struct gfs2_sbd *sdp)
+{
+        struct list_head *head = &sdp->sd_log_le_databuf;
+        LIST_HEAD(started);
+        struct gfs2_databuf *db;
+        struct buffer_head *bh;
+
+        while (!list_empty(head)) {
+                db = list_entry(head->prev, struct gfs2_databuf, db_le.le_list);
+                list_move(&db->db_le.le_list, &started);
+
+                gfs2_log_lock(sdp);
+                bh = db->db_bh;
+                if (bh) {
+                        get_bh(bh);
+                        gfs2_log_unlock(sdp);
+                        if (buffer_dirty(bh)) {
+                                wait_on_buffer(bh);
+                                ll_rw_block(WRITE, 1, &bh);
+                        }
+                        brelse(bh);
+                } else
+                        gfs2_log_unlock(sdp);
+        }
+
+        while (!list_empty(&started)) {
+                db = list_entry(started.next, struct gfs2_databuf,
+                                db_le.le_list);
+                list_del(&db->db_le.le_list);
+                sdp->sd_log_num_databuf--;
+
+                gfs2_log_lock(sdp);
+                bh = db->db_bh;
+                if (bh) {
+                        set_v2db(bh, NULL);
+                        gfs2_log_unlock(sdp);
+                        wait_on_buffer(bh);
+                        brelse(bh);
+                } else
+                        gfs2_log_unlock(sdp);
+
+                kfree(db);
+        }
+
+        gfs2_assert_warn(sdp, !sdp->sd_log_num_databuf);
+}
+
+struct gfs2_log_operations gfs2_glock_lops = {
+        .lo_add = glock_lo_add,
+        .lo_after_commit = glock_lo_after_commit,
+        .lo_name = "glock"
+};
+
+struct gfs2_log_operations gfs2_buf_lops = {
+        .lo_add = buf_lo_add,
+        .lo_incore_commit = buf_lo_incore_commit,
+        .lo_before_commit = buf_lo_before_commit,
+        .lo_after_commit = buf_lo_after_commit,
+        .lo_before_scan = buf_lo_before_scan,
+        .lo_scan_elements = buf_lo_scan_elements,
+        .lo_after_scan = buf_lo_after_scan,
+        .lo_name = "buf"
+};
+
+struct gfs2_log_operations gfs2_revoke_lops = {
+        .lo_add = revoke_lo_add,
+        .lo_before_commit = revoke_lo_before_commit,
+        .lo_before_scan = revoke_lo_before_scan,
+        .lo_scan_elements = revoke_lo_scan_elements,
+        .lo_after_scan = revoke_lo_after_scan,
+        .lo_name = "revoke"
+};
+
+struct gfs2_log_operations gfs2_rg_lops = {
+        .lo_add = rg_lo_add,
+        .lo_after_commit = rg_lo_after_commit,
+        .lo_name = "rg"
+};
+
+struct gfs2_log_operations gfs2_databuf_lops = {
+        .lo_add = databuf_lo_add,
+        .lo_before_commit = databuf_lo_before_commit,
+        .lo_name = "databuf"
+};
+
+struct gfs2_log_operations *gfs2_log_ops[] = {
+        &gfs2_glock_lops,
+        &gfs2_buf_lops,
+        &gfs2_revoke_lops,
+        &gfs2_rg_lops,
+        &gfs2_databuf_lops,
+        NULL
+};
+