* Re: [f2fs-dev] [PATCH] f2fs:Fix concurrent access issues in the function recover_dentry
[not found] <1439003569-17358-1-git-send-email-xerofoify@gmail.com>
2015-08-08 8:26 ` [f2fs-dev] [PATCH] f2fs:Fix concurrent access issues in the function recover_dentry Chao Yu
@ 2015-08-08 8:30 ` Chao Yu
1 sibling, 0 replies; 2+ messages in thread
From: Chao Yu @ 2015-08-08 8:30 UTC (permalink / raw)
To: Nicholas Krause; +Cc: jaegeuk, linux-kernel, linux-f2fs-devel
> On Aug 8, 2015, at 11:12 AM, Nicholas Krause <xerofoify@gmail.com> wrote:
>
> This fixes concurrent access issues in the function recover_dentry
> by locking and locking another the block labeled retry with the
> functions f2fs_lock_op/f2fs_unlock_op on a pointer of the
> superblock used by the passed inode structure pointer by this
Recovery and checkpoint will block each other with cp_mutex firstly,
so f2fs_lock_all in its only caller checkpoint have no chance to race
with any f2fs_lock_op in recovery procedure.
It’s not needed to call f2fs_lock_op here.
Thanks,
>
> Signed-off-by: Nicholas Krause <xerofoify@gmail.com>
> ---
> fs/f2fs/recovery.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
> index 24a8c1d..b86ea29 100644
> --- a/fs/f2fs/recovery.c
> +++ b/fs/f2fs/recovery.c
> @@ -70,6 +70,7 @@ static struct fsync_inode_entry *get_fsync_inode(struct list_head *head,
> static int recover_dentry(struct inode *inode, struct page *ipage)
> {
> struct f2fs_inode *raw_inode = F2FS_INODE(ipage);
> + struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> nid_t pino = le32_to_cpu(raw_inode->i_pino);
> struct f2fs_dir_entry *de;
> struct qstr name;
> @@ -97,6 +98,7 @@ static int recover_dentry(struct inode *inode, struct page *ipage)
> goto out_err;
> }
> retry:
> + f2fs_lock_op(sbi);
> de = f2fs_find_entry(dir, &name, &page);
> if (de && inode->i_ino == le32_to_cpu(de->ino))
> goto out_unmap_put;
> @@ -117,6 +119,7 @@ retry:
> }
> f2fs_delete_entry(de, page, dir, einode);
> iput(einode);
> + f2fs_unlock_op(sbi);
> goto retry;
> }
> err = __f2fs_add_link(dir, &name, inode, inode->i_ino, inode->i_mode);
> @@ -129,7 +132,8 @@ retry:
> add_dirty_dir_inode(dir);
> set_inode_flag(F2FS_I(dir), FI_DELAY_IPUT);
> }
> -
> +
> + f2fs_unlock_op(sbi);
> goto out;
>
> out_unmap_put:
> --
> 2.1.4
>
>
> ------------------------------------------------------------------------------
> _______________________________________________
> Linux-f2fs-devel mailing list
> Linux-f2fs-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
^ permalink raw reply [flat|nested] 2+ messages in thread