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SubjectRe: [f2fs-dev] [PATCH 11/11] f2fs: retry to truncate blocks in -ENOMEM case
On 2016/5/4 2:21, Jaegeuk Kim wrote:
> This patch modifies to retry truncating node blocks in -ENOMEM case.
>
Hi, Kim. in this patch, I think there is NO chance to retry for -ENOMEM.

This is because if exist_written_data returns false, we can confirm that
this inode has been released from orphan radix-tree:
f2fs_evict_inode
---> remove_inode_page
---> truncate_node
---> remove_orphan_inode
On this condition, err is 0, So it won't enter:
if (err && err != -ENOENT)
{
...
}
sequentially, there is no chance to truncate node blocks again.
I miss something else?

How about this patch?

--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -345,6 +345,7 @@ void f2fs_evict_inode(struct inode *inode)
set_inode_flag(fi, FI_NO_ALLOC);
i_size_write(inode, 0);

+retry:
if (F2FS_HAS_BLOCKS(inode))
err = f2fs_truncate(inode, true);

@@ -354,6 +355,11 @@ void f2fs_evict_inode(struct inode *inode)
f2fs_unlock_op(sbi);
}

+ if (err == -ENOMEM) {
+ err = 0;
+ goto retry;
+ }
+
sb_end_intwrite(inode->i_sb);
no_delete:
stat_dec_inline_xattr(inode);
> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
> ---
> fs/f2fs/inode.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
> diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
> index f4ac851..5cccd7a 100644
> --- a/fs/f2fs/inode.c
> +++ b/fs/f2fs/inode.c
> @@ -344,7 +344,7 @@ void f2fs_evict_inode(struct inode *inode)
> sb_start_intwrite(inode->i_sb);
> set_inode_flag(fi, FI_NO_ALLOC);
> i_size_write(inode, 0);
> -
> +retry:
> if (F2FS_HAS_BLOCKS(inode))
> err = f2fs_truncate(inode, true);
>
> @@ -374,6 +374,11 @@ no_delete:
>
> if (err && err != -ENOENT) {
> if (!exist_written_data(sbi, inode->i_ino, ORPHAN_INO)) {
> + /* give more chances, if ENOMEM case */
> + if (err == -ENOMEM) {
> + err = 0;
> + goto retry;
> + }
> /*
> * get here because we failed to release resource
> * of inode previously, reminder our user to run fsck
>


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