--- /dev/null
+/*
+ * 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/crc32.h>
+#include <linux/lm_interface.h>
+#include <linux/delay.h>
+
+#include "gfs2.h"
+#include "incore.h"
+#include "bmap.h"
+#include "glock.h"
+#include "log.h"
+#include "lops.h"
+#include "meta_io.h"
+#include "util.h"
+#include "dir.h"
+
+#define PULL 1
+
+/**
+ * gfs2_struct2blk - compute stuff
+ * @sdp: the filesystem
+ * @nstruct: the number of structures
+ * @ssize: the size of the structures
+ *
+ * Compute the number of log descriptor blocks needed to hold a certain number
+ * of structures of a certain size.
+ *
+ * Returns: the number of blocks needed (minimum is always 1)
+ */
+
+unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct,
+ unsigned int ssize)
+{
+ unsigned int blks;
+ unsigned int first, second;
+
+ blks = 1;
+ first = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / ssize;
+
+ if (nstruct > first) {
+ second = (sdp->sd_sb.sb_bsize -
+ sizeof(struct gfs2_meta_header)) / ssize;
+ blks += DIV_ROUND_UP(nstruct - first, second);
+ }
+
+ return blks;
+}
+
+/**
+ * gfs2_ail1_start_one - Start I/O on a part of the AIL
+ * @sdp: the filesystem
+ * @tr: the part of the AIL
+ *
+ */
+
+static void gfs2_ail1_start_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
+{
+ struct gfs2_bufdata *bd, *s;
+ struct buffer_head *bh;
+ int retry;
+
+ BUG_ON(!spin_is_locked(&sdp->sd_log_lock));
+
+ do {
+ retry = 0;
+
+ list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list,
+ bd_ail_st_list) {
+ bh = bd->bd_bh;
+
+ gfs2_assert(sdp, bd->bd_ail == ai);
+
+ if (!buffer_busy(bh)) {
+ if (!buffer_uptodate(bh)) {
+ gfs2_log_unlock(sdp);
+ gfs2_io_error_bh(sdp, bh);
+ gfs2_log_lock(sdp);
+ }
+ list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list);
+ continue;
+ }
+
+ if (!buffer_dirty(bh))
+ continue;
+
+ list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list);
+
+ gfs2_log_unlock(sdp);
+ wait_on_buffer(bh);
+ ll_rw_block(WRITE, 1, &bh);
+ gfs2_log_lock(sdp);
+
+ retry = 1;
+ break;
+ }
+ } while (retry);
+}
+
+/**
+ * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced
+ * @sdp: the filesystem
+ * @ai: the AIL entry
+ *
+ */
+
+static int gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai, int flags)
+{
+ struct gfs2_bufdata *bd, *s;
+ struct buffer_head *bh;
+
+ list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list,
+ bd_ail_st_list) {
+ bh = bd->bd_bh;
+
+ gfs2_assert(sdp, bd->bd_ail == ai);
+
+ if (buffer_busy(bh)) {
+ if (flags & DIO_ALL)
+ continue;
+ else
+ break;
+ }
+
+ if (!buffer_uptodate(bh))
+ gfs2_io_error_bh(sdp, bh);
+
+ list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list);
+ }
+
+ return list_empty(&ai->ai_ail1_list);
+}
+
+static void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags)
+{
+ struct list_head *head = &sdp->sd_ail1_list;
+ u64 sync_gen;
+ struct list_head *first;
+ struct gfs2_ail *first_ai, *ai, *tmp;
+ int done = 0;
+
+ gfs2_log_lock(sdp);
+ if (list_empty(head)) {
+ gfs2_log_unlock(sdp);
+ return;
+ }
+ sync_gen = sdp->sd_ail_sync_gen++;
+
+ first = head->prev;
+ first_ai = list_entry(first, struct gfs2_ail, ai_list);
+ first_ai->ai_sync_gen = sync_gen;
+ gfs2_ail1_start_one(sdp, first_ai); /* This may drop log lock */
+
+ if (flags & DIO_ALL)
+ first = NULL;
+
+ while(!done) {
+ if (first && (head->prev != first ||
+ gfs2_ail1_empty_one(sdp, first_ai, 0)))
+ break;
+
+ done = 1;
+ list_for_each_entry_safe_reverse(ai, tmp, head, ai_list) {
+ if (ai->ai_sync_gen >= sync_gen)
+ continue;
+ ai->ai_sync_gen = sync_gen;
+ gfs2_ail1_start_one(sdp, ai); /* This may drop log lock */
+ done = 0;
+ break;
+ }
+ }
+
+ gfs2_log_unlock(sdp);
+}
+
+int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags)
+{
+ struct gfs2_ail *ai, *s;
+ int ret;
+
+ gfs2_log_lock(sdp);
+
+ list_for_each_entry_safe_reverse(ai, s, &sdp->sd_ail1_list, ai_list) {
+ if (gfs2_ail1_empty_one(sdp, ai, flags))
+ list_move(&ai->ai_list, &sdp->sd_ail2_list);
+ else if (!(flags & DIO_ALL))
+ break;
+ }
+
+ ret = list_empty(&sdp->sd_ail1_list);
+
+ gfs2_log_unlock(sdp);
+
+ return ret;
+}
+
+
+/**
+ * gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced
+ * @sdp: the filesystem
+ * @ai: the AIL entry
+ *
+ */
+
+static void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
+{
+ struct list_head *head = &ai->ai_ail2_list;
+ struct gfs2_bufdata *bd;
+
+ while (!list_empty(head)) {
+ bd = list_entry(head->prev, struct gfs2_bufdata,
+ bd_ail_st_list);
+ gfs2_assert(sdp, bd->bd_ail == ai);
+ bd->bd_ail = NULL;
+ list_del(&bd->bd_ail_st_list);
+ list_del(&bd->bd_ail_gl_list);
+ atomic_dec(&bd->bd_gl->gl_ail_count);
+ brelse(bd->bd_bh);
+ }
+}
+
+static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail)
+{
+ struct gfs2_ail *ai, *safe;
+ unsigned int old_tail = sdp->sd_log_tail;
+ int wrap = (new_tail < old_tail);
+ int a, b, rm;
+
+ gfs2_log_lock(sdp);
+
+ list_for_each_entry_safe(ai, safe, &sdp->sd_ail2_list, ai_list) {
+ a = (old_tail <= ai->ai_first);
+ b = (ai->ai_first < new_tail);
+ rm = (wrap) ? (a || b) : (a && b);
+ if (!rm)
+ continue;
+
+ gfs2_ail2_empty_one(sdp, ai);
+ list_del(&ai->ai_list);
+ gfs2_assert_warn(sdp, list_empty(&ai->ai_ail1_list));
+ gfs2_assert_warn(sdp, list_empty(&ai->ai_ail2_list));
+ kfree(ai);
+ }
+
+ gfs2_log_unlock(sdp);
+}
+
+/**
+ * gfs2_log_reserve - Make a log reservation
+ * @sdp: The GFS2 superblock
+ * @blks: The number of blocks to reserve
+ *
+ * Note that we never give out the last 6 blocks of the journal. Thats
+ * due to the fact that there is are a small number of header blocks
+ * associated with each log flush. The exact number can't be known until
+ * flush time, so we ensure that we have just enough free blocks at all
+ * times to avoid running out during a log flush.
+ *
+ * Returns: errno
+ */
+
+int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks)
+{
+ unsigned int try = 0;
+
+ if (gfs2_assert_warn(sdp, blks) ||
+ gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks))
+ return -EINVAL;
+
+ mutex_lock(&sdp->sd_log_reserve_mutex);
+ gfs2_log_lock(sdp);
+ while(sdp->sd_log_blks_free <= (blks + 6)) {
+ gfs2_log_unlock(sdp);
+ gfs2_ail1_empty(sdp, 0);
+ gfs2_log_flush(sdp, NULL);
+
+ if (try++)
+ gfs2_ail1_start(sdp, 0);
+ gfs2_log_lock(sdp);
+ }
+ sdp->sd_log_blks_free -= blks;
+ gfs2_log_unlock(sdp);
+ mutex_unlock(&sdp->sd_log_reserve_mutex);
+
+ down_read(&sdp->sd_log_flush_lock);
+
+ return 0;
+}
+
+/**
+ * gfs2_log_release - Release a given number of log blocks
+ * @sdp: The GFS2 superblock
+ * @blks: The number of blocks
+ *
+ */
+
+void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks)
+{
+
+ gfs2_log_lock(sdp);
+ sdp->sd_log_blks_free += blks;
+ gfs2_assert_withdraw(sdp,
+ sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks);
+ gfs2_log_unlock(sdp);
+ up_read(&sdp->sd_log_flush_lock);
+}
+
+static u64 log_bmap(struct gfs2_sbd *sdp, unsigned int lbn)
+{
+ struct inode *inode = sdp->sd_jdesc->jd_inode;
+ int error;
+ struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
+
+ bh_map.b_size = 1 << inode->i_blkbits;
+ error = gfs2_block_map(inode, lbn, 0, &bh_map);
+ if (error || !bh_map.b_blocknr)
+ printk(KERN_INFO "error=%d, dbn=%llu lbn=%u", error,
+ (unsigned long long)bh_map.b_blocknr, lbn);
+ gfs2_assert_withdraw(sdp, !error && bh_map.b_blocknr);
+
+ return bh_map.b_blocknr;
+}
+
+/**
+ * log_distance - Compute distance between two journal blocks
+ * @sdp: The GFS2 superblock
+ * @newer: The most recent journal block of the pair
+ * @older: The older journal block of the pair
+ *
+ * Compute the distance (in the journal direction) between two
+ * blocks in the journal
+ *
+ * Returns: the distance in blocks
+ */
+
+static inline unsigned int log_distance(struct gfs2_sbd *sdp, unsigned int newer,
+ unsigned int older)
+{
+ int dist;
+
+ dist = newer - older;
+ if (dist < 0)
+ dist += sdp->sd_jdesc->jd_blocks;
+
+ return dist;
+}
+
+static unsigned int current_tail(struct gfs2_sbd *sdp)
+{
+ struct gfs2_ail *ai;
+ unsigned int tail;
+
+ gfs2_log_lock(sdp);
+
+ if (list_empty(&sdp->sd_ail1_list)) {
+ tail = sdp->sd_log_head;
+ } else {
+ ai = list_entry(sdp->sd_ail1_list.prev, struct gfs2_ail, ai_list);
+ tail = ai->ai_first;
+ }
+
+ gfs2_log_unlock(sdp);
+
+ return tail;
+}
+
+static inline void log_incr_head(struct gfs2_sbd *sdp)
+{
+ if (sdp->sd_log_flush_head == sdp->sd_log_tail)
+ gfs2_assert_withdraw(sdp, sdp->sd_log_flush_head == sdp->sd_log_head);
+
+ if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) {
+ sdp->sd_log_flush_head = 0;
+ sdp->sd_log_flush_wrapped = 1;
+ }
+}
+
+/**
+ * gfs2_log_get_buf - Get and initialize a buffer to use for log control data
+ * @sdp: The GFS2 superblock
+ *
+ * Returns: the buffer_head
+ */
+
+struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp)
+{
+ u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
+ struct gfs2_log_buf *lb;
+ struct buffer_head *bh;
+
+ lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL);
+ list_add(&lb->lb_list, &sdp->sd_log_flush_list);
+
+ bh = lb->lb_bh = sb_getblk(sdp->sd_vfs, blkno);
+ lock_buffer(bh);
+ memset(bh->b_data, 0, bh->b_size);
+ set_buffer_uptodate(bh);
+ clear_buffer_dirty(bh);
+ unlock_buffer(bh);
+
+ log_incr_head(sdp);
+
+ return bh;
+}
+
+/**
+ * gfs2_log_fake_buf - Build a fake buffer head to write metadata buffer to log
+ * @sdp: the filesystem
+ * @data: the data the buffer_head should point to
+ *
+ * Returns: the log buffer descriptor
+ */
+
+struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp,
+ struct buffer_head *real)
+{
+ u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
+ struct gfs2_log_buf *lb;
+ struct buffer_head *bh;
+
+ lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL);
+ list_add(&lb->lb_list, &sdp->sd_log_flush_list);
+ lb->lb_real = real;
+
+ bh = lb->lb_bh = alloc_buffer_head(GFP_NOFS | __GFP_NOFAIL);
+ atomic_set(&bh->b_count, 1);
+ bh->b_state = (1 << BH_Mapped) | (1 << BH_Uptodate);
+ set_bh_page(bh, real->b_page, bh_offset(real));
+ bh->b_blocknr = blkno;
+ bh->b_size = sdp->sd_sb.sb_bsize;
+ bh->b_bdev = sdp->sd_vfs->s_bdev;
+
+ log_incr_head(sdp);
+
+ return bh;
+}
+
+static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail, int pull)
+{
+ unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail);
+
+ ail2_empty(sdp, new_tail);
+
+ gfs2_log_lock(sdp);
+ sdp->sd_log_blks_free += dist - (pull ? 1 : 0);
+ gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks);
+ gfs2_log_unlock(sdp);
+
+ sdp->sd_log_tail = new_tail;
+}
+
+/**
+ * log_write_header - Get and initialize a journal header buffer
+ * @sdp: The GFS2 superblock
+ *
+ * Returns: the initialized log buffer descriptor
+ */
+
+static void log_write_header(struct gfs2_sbd *sdp, u32 flags, int pull)
+{
+ u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
+ struct buffer_head *bh;
+ struct gfs2_log_header *lh;
+ unsigned int tail;
+ u32 hash;
+
+ bh = sb_getblk(sdp->sd_vfs, blkno);
+ lock_buffer(bh);
+ memset(bh->b_data, 0, bh->b_size);
+ set_buffer_uptodate(bh);
+ clear_buffer_dirty(bh);
+ unlock_buffer(bh);
+
+ gfs2_ail1_empty(sdp, 0);
+ tail = current_tail(sdp);
+
+ lh = (struct gfs2_log_header *)bh->b_data;
+ memset(lh, 0, sizeof(struct gfs2_log_header));
+ lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
+ lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH);
+ lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH);
+ lh->lh_sequence = cpu_to_be64(sdp->sd_log_sequence++);
+ lh->lh_flags = cpu_to_be32(flags);
+ lh->lh_tail = cpu_to_be32(tail);
+ lh->lh_blkno = cpu_to_be32(sdp->sd_log_flush_head);
+ hash = gfs2_disk_hash(bh->b_data, sizeof(struct gfs2_log_header));
+ lh->lh_hash = cpu_to_be32(hash);
+
+ set_buffer_dirty(bh);
+ if (sync_dirty_buffer(bh))
+ gfs2_io_error_bh(sdp, bh);
+ brelse(bh);
+
+ if (sdp->sd_log_tail != tail)
+ log_pull_tail(sdp, tail, pull);
+ else
+ gfs2_assert_withdraw(sdp, !pull);
+
+ sdp->sd_log_idle = (tail == sdp->sd_log_flush_head);
+ log_incr_head(sdp);
+}
+
+static void log_flush_commit(struct gfs2_sbd *sdp)
+{
+ struct list_head *head = &sdp->sd_log_flush_list;
+ struct gfs2_log_buf *lb;
+ struct buffer_head *bh;
+
+ while (!list_empty(head)) {
+ lb = list_entry(head->next, struct gfs2_log_buf, lb_list);
+ list_del(&lb->lb_list);
+ bh = lb->lb_bh;
+
+ wait_on_buffer(bh);
+ if (!buffer_uptodate(bh))
+ gfs2_io_error_bh(sdp, bh);
+ if (lb->lb_real) {
+ while (atomic_read(&bh->b_count) != 1) /* Grrrr... */
+ schedule();
+ free_buffer_head(bh);
+ } else
+ brelse(bh);
+ kfree(lb);
+ }
+
+ log_write_header(sdp, 0, 0);
+}
+
+/**
+ * gfs2_log_flush - flush incore transaction(s)
+ * @sdp: the filesystem
+ * @gl: The glock structure to flush. If NULL, flush the whole incore log
+ *
+ */
+
+void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl)
+{
+ struct gfs2_ail *ai;
+
+ down_write(&sdp->sd_log_flush_lock);
+
+ if (gl) {
+ gfs2_log_lock(sdp);
+ if (list_empty(&gl->gl_le.le_list)) {
+ gfs2_log_unlock(sdp);
+ up_write(&sdp->sd_log_flush_lock);
+ return;
+ }
+ gfs2_log_unlock(sdp);
+ }
+
+ ai = kzalloc(sizeof(struct gfs2_ail), GFP_NOFS | __GFP_NOFAIL);
+ INIT_LIST_HEAD(&ai->ai_ail1_list);
+ INIT_LIST_HEAD(&ai->ai_ail2_list);
+
+ gfs2_assert_withdraw(sdp, sdp->sd_log_num_buf == sdp->sd_log_commited_buf);
+ gfs2_assert_withdraw(sdp,
+ sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke);
+
+ sdp->sd_log_flush_head = sdp->sd_log_head;
+ sdp->sd_log_flush_wrapped = 0;
+ ai->ai_first = sdp->sd_log_flush_head;
+
+ lops_before_commit(sdp);
+ if (!list_empty(&sdp->sd_log_flush_list))
+ log_flush_commit(sdp);
+ else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle)
+ log_write_header(sdp, 0, PULL);
+ lops_after_commit(sdp, ai);
+
+ gfs2_log_lock(sdp);
+ sdp->sd_log_head = sdp->sd_log_flush_head;
+ sdp->sd_log_blks_free -= sdp->sd_log_num_hdrs;
+ sdp->sd_log_blks_reserved = 0;
+ sdp->sd_log_commited_buf = 0;
+ sdp->sd_log_num_hdrs = 0;
+ sdp->sd_log_commited_revoke = 0;
+
+ if (!list_empty(&ai->ai_ail1_list)) {
+ list_add(&ai->ai_list, &sdp->sd_ail1_list);
+ ai = NULL;
+ }
+ gfs2_log_unlock(sdp);
+
+ sdp->sd_vfs->s_dirt = 0;
+ up_write(&sdp->sd_log_flush_lock);
+
+ kfree(ai);
+}
+
+static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
+{
+ unsigned int reserved = 0;
+ unsigned int old;
+
+ gfs2_log_lock(sdp);
+
+ sdp->sd_log_commited_buf += tr->tr_num_buf_new - tr->tr_num_buf_rm;
+ gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_buf) >= 0);
+ sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm;
+ gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_revoke) >= 0);
+
+ if (sdp->sd_log_commited_buf)
+ reserved += sdp->sd_log_commited_buf;
+ if (sdp->sd_log_commited_revoke)
+ reserved += gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke,
+ sizeof(u64));
+ if (reserved)
+ reserved++;
+
+ old = sdp->sd_log_blks_free;
+ sdp->sd_log_blks_free += tr->tr_reserved -
+ (reserved - sdp->sd_log_blks_reserved);
+
+ gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free >= old);
+ gfs2_assert_withdraw(sdp,
+ sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks +
+ sdp->sd_log_num_hdrs);
+
+ sdp->sd_log_blks_reserved = reserved;
+
+ gfs2_log_unlock(sdp);
+}
+
+/**
+ * gfs2_log_commit - Commit a transaction to the log
+ * @sdp: the filesystem
+ * @tr: the transaction
+ *
+ * Returns: errno
+ */
+
+void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
+{
+ log_refund(sdp, tr);
+ lops_incore_commit(sdp, tr);
+
+ sdp->sd_vfs->s_dirt = 1;
+ up_read(&sdp->sd_log_flush_lock);
+
+ gfs2_log_lock(sdp);
+ if (sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks))
+ wake_up_process(sdp->sd_logd_process);
+ gfs2_log_unlock(sdp);
+}
+
+/**
+ * gfs2_log_shutdown - write a shutdown header into a journal
+ * @sdp: the filesystem
+ *
+ */
+
+void gfs2_log_shutdown(struct gfs2_sbd *sdp)
+{
+ down_write(&sdp->sd_log_flush_lock);
+
+ gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved);
+ gfs2_assert_withdraw(sdp, !sdp->sd_log_num_gl);
+ gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf);
+ gfs2_assert_withdraw(sdp, !sdp->sd_log_num_jdata);
+ gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
+ gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg);
+ gfs2_assert_withdraw(sdp, !sdp->sd_log_num_databuf);
+ gfs2_assert_withdraw(sdp, !sdp->sd_log_num_hdrs);
+ gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list));
+
+ sdp->sd_log_flush_head = sdp->sd_log_head;
+ sdp->sd_log_flush_wrapped = 0;
+
+ log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT, 0);
+
+ gfs2_assert_warn(sdp, sdp->sd_log_blks_free == sdp->sd_jdesc->jd_blocks);
+ gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail);
+ gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list));
+
+ sdp->sd_log_head = sdp->sd_log_flush_head;
+ sdp->sd_log_tail = sdp->sd_log_head;
+
+ up_write(&sdp->sd_log_flush_lock);
+}
+
+
+/**
+ * gfs2_meta_syncfs - sync all the buffers in a filesystem
+ * @sdp: the filesystem
+ *
+ */
+
+void gfs2_meta_syncfs(struct gfs2_sbd *sdp)
+{
+ gfs2_log_flush(sdp, NULL);
+ for (;;) {
+ gfs2_ail1_start(sdp, DIO_ALL);
+ if (gfs2_ail1_empty(sdp, DIO_ALL))
+ break;
+ msleep(10);
+ }
+}
+
git://git.onelab.eu / linux-2.6.git / blobdiff