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authorSteven Whitehouse <swhiteho@redhat.com>2013-01-28 13:30:07 +0400
committerSteven Whitehouse <swhiteho@redhat.com>2013-01-29 14:29:17 +0400
commit4513899092b3254b3539f92a65d2839afa1d50f6 (patch)
tree1080b7adfac648dacd2d4aa70643a6a456284492 /fs/gfs2/log.c
parentd564053f074634e7a966359dc97d26900fa5f52d (diff)
downloadlinux-4513899092b3254b3539f92a65d2839afa1d50f6.tar.xz
GFS2: Use ->writepages for ordered writes
Instead of using a list of buffers to write ahead of the journal flush, this now uses a list of inodes and calls ->writepages via filemap_fdatawrite() in order to achieve the same thing. For most use cases this results in a shorter ordered write list, as well as much larger i/os being issued. The ordered write list is sorted by inode number before writing in order to retain the disk block ordering between inodes as per the previous code. The previous ordered write code used to conflict in its assumptions about how to write out the disk blocks with mpage_writepages() so that with this updated version we can also use mpage_writepages() for GFS2's ordered write, writepages implementation. So we will also send larger i/os from writeback too. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/log.c')
-rw-r--r--fs/gfs2/log.c76
1 files changed, 36 insertions, 40 deletions
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index f4beeb9c81c1..9a2ca8be7647 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -482,70 +482,66 @@ static void log_flush_wait(struct gfs2_sbd *sdp)
}
}
-static int bd_cmp(void *priv, struct list_head *a, struct list_head *b)
+static int ip_cmp(void *priv, struct list_head *a, struct list_head *b)
{
- struct gfs2_bufdata *bda, *bdb;
+ struct gfs2_inode *ipa, *ipb;
- bda = list_entry(a, struct gfs2_bufdata, bd_list);
- bdb = list_entry(b, struct gfs2_bufdata, bd_list);
+ ipa = list_entry(a, struct gfs2_inode, i_ordered);
+ ipb = list_entry(b, struct gfs2_inode, i_ordered);
- if (bda->bd_bh->b_blocknr < bdb->bd_bh->b_blocknr)
+ if (ipa->i_no_addr < ipb->i_no_addr)
return -1;
- if (bda->bd_bh->b_blocknr > bdb->bd_bh->b_blocknr)
+ if (ipa->i_no_addr > ipb->i_no_addr)
return 1;
return 0;
}
static void gfs2_ordered_write(struct gfs2_sbd *sdp)
{
- struct gfs2_bufdata *bd;
- struct buffer_head *bh;
+ struct gfs2_inode *ip;
LIST_HEAD(written);
- gfs2_log_lock(sdp);
- list_sort(NULL, &sdp->sd_log_le_ordered, &bd_cmp);
+ spin_lock(&sdp->sd_ordered_lock);
+ list_sort(NULL, &sdp->sd_log_le_ordered, &ip_cmp);
while (!list_empty(&sdp->sd_log_le_ordered)) {
- bd = list_entry(sdp->sd_log_le_ordered.next, struct gfs2_bufdata, bd_list);
- list_move(&bd->bd_list, &written);
- bh = bd->bd_bh;
- if (!buffer_dirty(bh))
+ ip = list_entry(sdp->sd_log_le_ordered.next, struct gfs2_inode, i_ordered);
+ list_move(&ip->i_ordered, &written);
+ if (ip->i_inode.i_mapping->nrpages == 0)
continue;
- get_bh(bh);
- gfs2_log_unlock(sdp);
- lock_buffer(bh);
- if (buffer_mapped(bh) && test_clear_buffer_dirty(bh)) {
- bh->b_end_io = end_buffer_write_sync;
- submit_bh(WRITE_SYNC, bh);
- } else {
- unlock_buffer(bh);
- brelse(bh);
- }
- gfs2_log_lock(sdp);
+ spin_unlock(&sdp->sd_ordered_lock);
+ filemap_fdatawrite(ip->i_inode.i_mapping);
+ spin_lock(&sdp->sd_ordered_lock);
}
list_splice(&written, &sdp->sd_log_le_ordered);
- gfs2_log_unlock(sdp);
+ spin_unlock(&sdp->sd_ordered_lock);
}
static void gfs2_ordered_wait(struct gfs2_sbd *sdp)
{
- struct gfs2_bufdata *bd;
- struct buffer_head *bh;
+ struct gfs2_inode *ip;
- gfs2_log_lock(sdp);
+ spin_lock(&sdp->sd_ordered_lock);
while (!list_empty(&sdp->sd_log_le_ordered)) {
- bd = list_entry(sdp->sd_log_le_ordered.prev, struct gfs2_bufdata, bd_list);
- bh = bd->bd_bh;
- if (buffer_locked(bh)) {
- get_bh(bh);
- gfs2_log_unlock(sdp);
- wait_on_buffer(bh);
- brelse(bh);
- gfs2_log_lock(sdp);
+ ip = list_entry(sdp->sd_log_le_ordered.next, struct gfs2_inode, i_ordered);
+ list_del(&ip->i_ordered);
+ WARN_ON(!test_and_clear_bit(GIF_ORDERED, &ip->i_flags));
+ if (ip->i_inode.i_mapping->nrpages == 0)
continue;
- }
- list_del_init(&bd->bd_list);
+ spin_unlock(&sdp->sd_ordered_lock);
+ filemap_fdatawait(ip->i_inode.i_mapping);
+ spin_lock(&sdp->sd_ordered_lock);
}
- gfs2_log_unlock(sdp);
+ spin_unlock(&sdp->sd_ordered_lock);
+}
+
+void gfs2_ordered_del_inode(struct gfs2_inode *ip)
+{
+ struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+
+ spin_lock(&sdp->sd_ordered_lock);
+ if (test_and_clear_bit(GIF_ORDERED, &ip->i_flags))
+ list_del(&ip->i_ordered);
+ spin_unlock(&sdp->sd_ordered_lock);
}
/**