[PATCH 05/10] f2fs: fix roll-forward missing scenarios
From: Jaegeuk Kim
Date: Sun Sep 14 2014 - 18:16:25 EST
We can summarize the roll forward recovery scenarios as follows.
[Term] F: fsync_mark, D: dentry_mark
1. inode(x) | CP | inode(x) | dnode(F)
-> Update the latest inode(x).
2. inode(x) | CP | inode(F) | dnode(F)
-> No problem.
3. inode(x) | CP | dnode(F) | inode(x)
-> Recover to the latest dnode(F), and drop the last inode(x)
4. inode(x) | CP | dnode(F) | inode(F)
-> No problem.
5. CP | inode(x) | dnode(F)
-> The inode(DF) was missing. Should drop this dnode(F).
6. CP | inode(DF) | dnode(F)
-> No problem.
7. CP | dnode(F) | inode(DF)
-> If f2fs_iget fails, then goto next to find inode(DF).
8. CP | dnode(F) | inode(x)
-> If f2fs_iget fails, then goto next to find inode(DF).
But it will fail due to no inode(DF).
So, this patch adds some missing points such as #1, #5, #7, and #8.
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
fs/f2fs/file.c | 20 ++++++++++++----
fs/f2fs/node.c | 11 ++++++++-
fs/f2fs/recovery.c | 70 +++++++++++++++++++++++++++++++++++++++++++++---------
3 files changed, 85 insertions(+), 16 deletions(-)
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index af06e22..c814cd2 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -207,15 +207,27 @@ int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
up_write(&fi->i_sem);
}
} else {
- /* if there is no written node page, write its inode page */
- while (!sync_node_pages(sbi, ino, &wbc)) {
- if (fsync_mark_done(sbi, ino))
- goto out;
+sync_nodes:
+ sync_node_pages(sbi, ino, &wbc);
+
+ /*
+ * inode(x) | CP | inode(x) | dnode(F)
+ * -> ok
+ * inode(x) | CP | dnode(F) | inode(x)
+ * -> inode(x) | CP | dnode(F) | inode(x) | inode(F)
+ * CP | inode(x) | dnode(F)
+ * -> CP | inode(x) | dnode(F) | inode(DF)
+ * CP | dnode(F) | inode(x)
+ * -> CP | dnode(F) | inode(x) | inode(DF)
+ */
+ if (!fsync_mark_done(sbi, ino)) {
mark_inode_dirty_sync(inode);
ret = f2fs_write_inode(inode, NULL);
if (ret)
goto out;
+ goto sync_nodes;
}
+
ret = wait_on_node_pages_writeback(sbi, ino);
if (ret)
goto out;
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index b32eb56..653aa71 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -248,8 +248,17 @@ retry:
/* update fsync_mark if its inode nat entry is still alive */
e = __lookup_nat_cache(nm_i, ni->ino);
- if (e)
+ if (e) {
+ /*
+ * CP | inode(x) | dnode(F)
+ * -> CP | inode(x) | dnode(F) | inode(DF)
+ */
+ if (!e->checkpointed && !e->fsync_done &&
+ ni->ino != ni->nid && fsync_done)
+ goto skip;
e->fsync_done = fsync_done;
+ }
+skip:
write_unlock(&nm_i->nat_tree_lock);
}
diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
index 6c5a74a..3736728 100644
--- a/fs/f2fs/recovery.c
+++ b/fs/f2fs/recovery.c
@@ -14,6 +14,36 @@
#include "node.h"
#include "segment.h"
+/*
+ * Roll forward recovery scenarios.
+ *
+ * [Term] F: fsync_mark, D: dentry_mark
+ *
+ * 1. inode(x) | CP | inode(x) | dnode(F)
+ * -> Update the latest inode(x).
+ *
+ * 2. inode(x) | CP | inode(F) | dnode(F)
+ * -> No problem.
+ *
+ * 3. inode(x) | CP | dnode(F) | inode(x)
+ * -> Recover to the latest dnode(F), and drop the last inode(x)
+ *
+ * 4. inode(x) | CP | dnode(F) | inode(F)
+ * -> No problem.
+ *
+ * 5. CP | inode(x) | dnode(F)
+ * -> The inode(DF) was missing. Should drop this dnode(F).
+ *
+ * 6. CP | inode(DF) | dnode(F)
+ * -> No problem.
+ *
+ * 7. CP | dnode(F) | inode(DF)
+ * -> If f2fs_iget fails, then goto next to find inode(DF).
+ *
+ * 8. CP | dnode(F) | inode(x)
+ * -> If f2fs_iget fails, then goto next to find inode(DF).
+ * But it will fail due to no inode(DF).
+ */
static struct kmem_cache *fsync_entry_slab;
bool space_for_roll_forward(struct f2fs_sb_info *sbi)
@@ -110,27 +140,32 @@ out:
return err;
}
-static int recover_inode(struct inode *inode, struct page *node_page)
+static void __recover_inode(struct inode *inode, struct page *page)
{
- struct f2fs_inode *raw_inode = F2FS_INODE(node_page);
+ struct f2fs_inode *raw = F2FS_INODE(page);
+
+ inode->i_mode = le16_to_cpu(raw->i_mode);
+ i_size_write(inode, le64_to_cpu(raw->i_size));
+ inode->i_atime.tv_sec = le64_to_cpu(raw->i_mtime);
+ inode->i_ctime.tv_sec = le64_to_cpu(raw->i_ctime);
+ inode->i_mtime.tv_sec = le64_to_cpu(raw->i_mtime);
+ inode->i_atime.tv_nsec = le32_to_cpu(raw->i_mtime_nsec);
+ inode->i_ctime.tv_nsec = le32_to_cpu(raw->i_ctime_nsec);
+ inode->i_mtime.tv_nsec = le32_to_cpu(raw->i_mtime_nsec);
+}
+static int recover_inode(struct inode *inode, struct page *node_page)
+{
if (!IS_INODE(node_page))
return 0;
- inode->i_mode = le16_to_cpu(raw_inode->i_mode);
- i_size_write(inode, le64_to_cpu(raw_inode->i_size));
- inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
- inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
- inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
- inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
- inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
- inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
+ __recover_inode(inode, node_page);
if (is_dent_dnode(node_page))
return recover_dentry(node_page, inode);
f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode: ino = %x, name = %s",
- ino_of_node(node_page), raw_inode->i_name);
+ ino_of_node(node_page), F2FS_INODE(node_page)->i_name);
return 0;
}
@@ -186,10 +221,16 @@ static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head)
break;
}
+ /*
+ * CP | dnode(F) | inode(DF)
+ * For this case, we should not give up now.
+ */
entry->inode = f2fs_iget(sbi->sb, ino_of_node(page));
if (IS_ERR(entry->inode)) {
err = PTR_ERR(entry->inode);
kmem_cache_free(fsync_entry_slab, entry);
+ if (err == -ENOENT)
+ goto next;
break;
}
list_add_tail(&entry->list, head);
@@ -416,6 +457,13 @@ static int recover_data(struct f2fs_sb_info *sbi,
entry = get_fsync_inode(head, ino_of_node(page));
if (!entry)
goto next;
+ /*
+ * inode(x) | CP | inode(x) | dnode(F)
+ * In this case, we can lose the latest inode(x).
+ * So, call __recover_inode for the inode update.
+ */
+ if (IS_INODE(page))
+ __recover_inode(entry->inode, page);
err = do_recover_data(sbi, entry->inode, page, blkaddr);
if (err)
--
1.8.5.2 (Apple Git-48)
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