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SubjectRe: [f2fs-dev] [PATCH 2/2] f2fs: fix wrong AUTO_RECOVER condition
On Fri, Nov 25, 2016 at 11:40:58PM +0800, Chao Yu wrote:
> Hi Jaegeuk,
>
> isize AUTO_RECOVER still be corrupted..., try below case:
>
> 1. xfs_io -f /mnt/f2fs/file -c "pwrite 0 4096" -c "fsync"
> 2. xfs_io -f /mnt/f2fs/file -c "falloc -k 4096 4096" -c "fsync"
> 3. md5sum /mnt/f2fs/file;
> 4. godown /mnt/f2fs/
> 5. umount /mnt/f2fs/
> 6. mount -t f2fs /dev/sdx /mnt/f2fs
> 7. md5sum /mnt/f2fs/file
>
> It's hard to deside to recover isize or not when current recovered block is
> fallocated, as we can allocate block inside or outside of isize.
>
> Any thoughts?

Could you take a look at this patch?

From a370aa1e8926958e143757465083923fff92bb79 Mon Sep 17 00:00:00 2001
From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Mon, 28 Nov 2016 15:33:38 -0800
Subject: [PATCH] f2fs: do not activate auto_recovery for fallocated i_size

If a file needs to keep its i_size by fallocate, we need to turn off auto
recovery during roll-forward recovery.

This will resolve the below scenario.

1. xfs_io -f /mnt/f2fs/file -c "pwrite 0 4096" -c "fsync"
2. xfs_io -f /mnt/f2fs/file -c "falloc -k 4096 4096" -c "fsync"
3. md5sum /mnt/f2fs/file;
4. godown /mnt/f2fs/
5. umount /mnt/f2fs/
6. mount -t f2fs /dev/sdx /mnt/f2fs
7. md5sum /mnt/f2fs/file

Reported-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
fs/f2fs/f2fs.h | 38 +++++++++++++++++++++-----------------
fs/f2fs/file.c | 2 ++
fs/f2fs/recovery.c | 11 ++++++++---
3 files changed, 31 insertions(+), 20 deletions(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 593cd6d..8a65949 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -401,6 +401,7 @@ struct f2fs_map_blocks {
#define FADVISE_LOST_PINO_BIT 0x02
#define FADVISE_ENCRYPT_BIT 0x04
#define FADVISE_ENC_NAME_BIT 0x08
+#define FADVISE_KEEP_SIZE_BIT 0x10

#define file_is_cold(inode) is_file(inode, FADVISE_COLD_BIT)
#define file_wrong_pino(inode) is_file(inode, FADVISE_LOST_PINO_BIT)
@@ -413,6 +414,8 @@ struct f2fs_map_blocks {
#define file_clear_encrypt(inode) clear_file(inode, FADVISE_ENCRYPT_BIT)
#define file_enc_name(inode) is_file(inode, FADVISE_ENC_NAME_BIT)
#define file_set_enc_name(inode) set_file(inode, FADVISE_ENC_NAME_BIT)
+#define file_keep_isize(inode) is_file(inode, FADVISE_KEEP_SIZE_BIT)
+#define file_set_keep_isize(inode) set_file(inode, FADVISE_KEEP_SIZE_BIT)

#define DEF_DIR_LEVEL 0

@@ -1716,23 +1719,6 @@ static inline void f2fs_i_size_write(struct inode *inode, loff_t i_size)
set_inode_flag(inode, FI_AUTO_RECOVER);
}

-static inline bool f2fs_skip_inode_update(struct inode *inode, int dsync)
-{
- if (dsync) {
- struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
- bool ret;
-
- spin_lock(&sbi->inode_lock[DIRTY_META]);
- ret = list_empty(&F2FS_I(inode)->gdirty_list);
- spin_unlock(&sbi->inode_lock[DIRTY_META]);
- return ret;
- }
- if (!is_inode_flag_set(inode, FI_AUTO_RECOVER) ||
- i_size_read(inode) & PAGE_MASK)
- return false;
- return F2FS_I(inode)->last_disk_size == i_size_read(inode);
-}
-
static inline void f2fs_i_depth_write(struct inode *inode, unsigned int depth)
{
F2FS_I(inode)->i_current_depth = depth;
@@ -1885,6 +1871,24 @@ static inline void clear_file(struct inode *inode, int type)
f2fs_mark_inode_dirty_sync(inode, true);
}

+static inline bool f2fs_skip_inode_update(struct inode *inode, int dsync)
+{
+ if (dsync) {
+ struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+ bool ret;
+
+ spin_lock(&sbi->inode_lock[DIRTY_META]);
+ ret = list_empty(&F2FS_I(inode)->gdirty_list);
+ spin_unlock(&sbi->inode_lock[DIRTY_META]);
+ return ret;
+ }
+ if (!is_inode_flag_set(inode, FI_AUTO_RECOVER) ||
+ file_keep_isize(inode) ||
+ i_size_read(inode) & PAGE_MASK)
+ return false;
+ return F2FS_I(inode)->last_disk_size == i_size_read(inode);
+}
+
static inline int f2fs_readonly(struct super_block *sb)
{
return sb->s_flags & MS_RDONLY;
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index b43d164..22a3f76 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1399,6 +1399,8 @@ static long f2fs_fallocate(struct file *file, int mode,
if (!ret) {
inode->i_mtime = inode->i_ctime = current_time(inode);
f2fs_mark_inode_dirty_sync(inode, false);
+ if (mode & FALLOC_FL_KEEP_SIZE)
+ file_set_keep_isize(inode);
f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
}

diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
index 687c176..981a958 100644
--- a/fs/f2fs/recovery.c
+++ b/fs/f2fs/recovery.c
@@ -187,6 +187,8 @@ static void recover_inode(struct inode *inode, struct page *page)
inode->i_ctime.tv_nsec = le32_to_cpu(raw->i_ctime_nsec);
inode->i_mtime.tv_nsec = le32_to_cpu(raw->i_mtime_nsec);

+ F2FS_I(inode)->i_advise = raw->i_advise;
+
if (file_enc_name(inode))
name = "<encrypted>";
else
@@ -425,7 +427,8 @@ static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
continue;
}

- if (i_size_read(inode) <= (start << PAGE_SHIFT))
+ if (!file_keep_isize(inode) &&
+ (i_size_read(inode) <= (start << PAGE_SHIFT)))
f2fs_i_size_write(inode, (start + 1) << PAGE_SHIFT);

/*
@@ -478,8 +481,10 @@ static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
f2fs_put_dnode(&dn);
out:
f2fs_msg(sbi->sb, KERN_NOTICE,
- "recover_data: ino = %lx, recovered = %d blocks, err = %d",
- inode->i_ino, recovered, err);
+ "recover_data: ino = %lx (i_size: %s) recovered = %d, err = %d",
+ inode->i_ino,
+ file_keep_isize(inode) ? "keep" : "recover",
+ recovered, err);
return err;
}

--
2.8.3
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