Commit 441ac5cb authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: fix roll-forward missing scenarios

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: default avatarHuang Ying <ying.huang@intel.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 88bd02c9
......@@ -14,6 +14,37 @@
#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 +141,32 @@ static int recover_dentry(struct page *ipage, struct inode *inode)
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;
}
......@@ -180,10 +216,16 @@ 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);
......@@ -417,6 +459,13 @@ 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) {
......
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