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Diffstat (limited to 'fs/gfs2/log.c')
-rw-r--r--fs/gfs2/log.c41
1 files changed, 32 insertions, 9 deletions
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 0cace3da9dbb..291415ddfe51 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -15,6 +15,7 @@
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>
#include <linux/lm_interface.h>
+#include <linux/delay.h>
#include "gfs2.h"
#include "incore.h"
@@ -142,7 +143,7 @@ static int gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai, int fl
return list_empty(&ai->ai_ail1_list);
}
-void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags)
+static void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags)
{
struct list_head *head = &sdp->sd_ail1_list;
u64 sync_gen;
@@ -261,6 +262,12 @@ static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail)
* @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
*/
@@ -274,7 +281,7 @@ int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks)
mutex_lock(&sdp->sd_log_reserve_mutex);
gfs2_log_lock(sdp);
- while(sdp->sd_log_blks_free <= blks) {
+ while(sdp->sd_log_blks_free <= (blks + 6)) {
gfs2_log_unlock(sdp);
gfs2_ail1_empty(sdp, 0);
gfs2_log_flush(sdp, NULL);
@@ -319,7 +326,8 @@ static u64 log_bmap(struct gfs2_sbd *sdp, unsigned int lbn)
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, bh_map.b_blocknr, lbn);
+ 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;
@@ -643,12 +651,9 @@ void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
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)) {
- gfs2_log_unlock(sdp);
- gfs2_log_flush(sdp, NULL);
- } else {
- gfs2_log_unlock(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);
}
/**
@@ -686,3 +691,21 @@ void gfs2_log_shutdown(struct gfs2_sbd *sdp)
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);
+ }
+}
+