f2fs: Update to proper 3.4 support
http://git.kernel.org/cgit/linux/kernel/git/jaegeuk/f2fs.git/log/?h=linux-3.4
Change-Id: Ica17871e847d4807c7ef24ea77dd4bff5451f5c7
Conflicts:
fs/f2fs/f2fs.h
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 3110c29..3461bc1 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -13,6 +13,7 @@
#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/prefetch.h>
+#include <linux/kthread.h>
#include <linux/vmalloc.h>
#include <linux/swap.h>
@@ -195,6 +196,132 @@
f2fs_sync_fs(sbi->sb, true);
}
+struct __submit_bio_ret {
+ struct completion event;
+ int error;
+};
+
+static void __submit_bio_wait_endio(struct bio *bio, int error)
+{
+ struct __submit_bio_ret *ret = bio->bi_private;
+
+ ret->error = error;
+ complete(&ret->event);
+}
+
+static int __submit_bio_wait(int rw, struct bio *bio)
+{
+ struct __submit_bio_ret ret;
+
+ rw |= REQ_SYNC;
+ init_completion(&ret.event);
+ bio->bi_private = &ret;
+ bio->bi_end_io = __submit_bio_wait_endio;
+ submit_bio(rw, bio);
+ wait_for_completion(&ret.event);
+
+ return ret.error;
+}
+
+static int issue_flush_thread(void *data)
+{
+ struct f2fs_sb_info *sbi = data;
+ struct flush_cmd_control *fcc = SM_I(sbi)->cmd_control_info;
+ wait_queue_head_t *q = &fcc->flush_wait_queue;
+repeat:
+ if (kthread_should_stop())
+ return 0;
+
+ spin_lock(&fcc->issue_lock);
+ if (fcc->issue_list) {
+ fcc->dispatch_list = fcc->issue_list;
+ fcc->issue_list = fcc->issue_tail = NULL;
+ }
+ spin_unlock(&fcc->issue_lock);
+
+ if (fcc->dispatch_list) {
+ struct bio *bio = bio_alloc(GFP_NOIO, 0);
+ struct flush_cmd *cmd, *next;
+ int ret;
+
+ bio->bi_bdev = sbi->sb->s_bdev;
+ ret = __submit_bio_wait(WRITE_FLUSH, bio);
+
+ for (cmd = fcc->dispatch_list; cmd; cmd = next) {
+ cmd->ret = ret;
+ next = cmd->next;
+ complete(&cmd->wait);
+ }
+ bio_put(bio);
+ fcc->dispatch_list = NULL;
+ }
+
+ wait_event_interruptible(*q,
+ kthread_should_stop() || fcc->issue_list);
+ goto repeat;
+}
+
+int f2fs_issue_flush(struct f2fs_sb_info *sbi)
+{
+ struct flush_cmd_control *fcc = SM_I(sbi)->cmd_control_info;
+ struct flush_cmd cmd;
+
+ if (!test_opt(sbi, FLUSH_MERGE))
+ return blkdev_issue_flush(sbi->sb->s_bdev, GFP_KERNEL, NULL);
+
+ init_completion(&cmd.wait);
+ cmd.next = NULL;
+
+ spin_lock(&fcc->issue_lock);
+ if (fcc->issue_list)
+ fcc->issue_tail->next = &cmd;
+ else
+ fcc->issue_list = &cmd;
+ fcc->issue_tail = &cmd;
+ spin_unlock(&fcc->issue_lock);
+
+ if (!fcc->dispatch_list)
+ wake_up(&fcc->flush_wait_queue);
+
+ wait_for_completion(&cmd.wait);
+
+ return cmd.ret;
+}
+
+int create_flush_cmd_control(struct f2fs_sb_info *sbi)
+{
+ dev_t dev = sbi->sb->s_bdev->bd_dev;
+ struct flush_cmd_control *fcc;
+ int err = 0;
+
+ fcc = kzalloc(sizeof(struct flush_cmd_control), GFP_KERNEL);
+ if (!fcc)
+ return -ENOMEM;
+ spin_lock_init(&fcc->issue_lock);
+ init_waitqueue_head(&fcc->flush_wait_queue);
+ SM_I(sbi)->cmd_control_info = fcc;
+ fcc->f2fs_issue_flush = kthread_run(issue_flush_thread, sbi,
+ "f2fs_flush-%u:%u", MAJOR(dev), MINOR(dev));
+ if (IS_ERR(fcc->f2fs_issue_flush)) {
+ err = PTR_ERR(fcc->f2fs_issue_flush);
+ kfree(fcc);
+ SM_I(sbi)->cmd_control_info = NULL;
+ return err;
+ }
+
+ return err;
+}
+
+void destroy_flush_cmd_control(struct f2fs_sb_info *sbi)
+{
+ struct flush_cmd_control *fcc = SM_I(sbi)->cmd_control_info;
+
+ if (fcc && fcc->f2fs_issue_flush)
+ kthread_stop(fcc->f2fs_issue_flush);
+ kfree(fcc);
+ SM_I(sbi)->cmd_control_info = NULL;
+}
+
static void __locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno,
enum dirty_type dirty_type)
{
@@ -1057,12 +1184,37 @@
mutex_unlock(&curseg->curseg_mutex);
}
+static inline bool is_merged_page(struct f2fs_sb_info *sbi,
+ struct page *page, enum page_type type)
+{
+ enum page_type btype = PAGE_TYPE_OF_BIO(type);
+ struct f2fs_bio_info *io = &sbi->write_io[btype];
+ struct bio_vec *bvec;
+ int i;
+
+ down_read(&io->io_rwsem);
+ if (!io->bio)
+ goto out;
+
+ __bio_for_each_segment(bvec, io->bio, i, 0) {
+ if (page == bvec->bv_page) {
+ up_read(&io->io_rwsem);
+ return true;
+ }
+ }
+
+out:
+ up_read(&io->io_rwsem);
+ return false;
+}
+
void f2fs_wait_on_page_writeback(struct page *page,
enum page_type type)
{
struct f2fs_sb_info *sbi = F2FS_SB(page->mapping->host->i_sb);
if (PageWriteback(page)) {
- f2fs_submit_merged_bio(sbi, type, WRITE);
+ if (is_merged_page(sbi, page, type))
+ f2fs_submit_merged_bio(sbi, type, WRITE);
wait_on_page_writeback(page);
}
}
@@ -1577,7 +1729,7 @@
struct curseg_info *array;
int i;
- array = kzalloc(sizeof(*array) * NR_CURSEG_TYPE, GFP_KERNEL);
+ array = kcalloc(NR_CURSEG_TYPE, sizeof(*array), GFP_KERNEL);
if (!array)
return -ENOMEM;
@@ -1776,6 +1928,12 @@
sm_info->nr_discards = 0;
sm_info->max_discards = 0;
+ if (test_opt(sbi, FLUSH_MERGE) && !f2fs_readonly(sbi->sb)) {
+ err = create_flush_cmd_control(sbi);
+ if (err)
+ return err;
+ }
+
err = build_sit_info(sbi);
if (err)
return err;
@@ -1882,8 +2040,10 @@
void destroy_segment_manager(struct f2fs_sb_info *sbi)
{
struct f2fs_sm_info *sm_info = SM_I(sbi);
+
if (!sm_info)
return;
+ destroy_flush_cmd_control(sbi);
destroy_dirty_segmap(sbi);
destroy_curseg(sbi);
destroy_free_segmap(sbi);