linux-kernel - Re: [PATCH v1 1/1] ubifs: only check replay with inode type to judge if inode linked

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Message-ID: <1617765808.4370.1.camel@mhfsdcap03>
Date:   Wed, 7 Apr 2021 11:23:28 +0800
From:   Guochun Mao <guochun.mao@...iatek.com>
To:     Richard Weinberger <richard@....at>
CC:     Matthias Brugger <matthias.bgg@...il.com>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <srv_heupstream@...iatek.com>
Subject: Re: [PATCH v1 1/1] ubifs: only check replay with inode type to
 judge if inode linked

Hi Richard,

Gentle ping.


On Tue, 2021-03-16 at 16:52 +0800, guochun.mao@...iatek.com wrote:
> From: Guochun Mao <guochun.mao@...iatek.com>
> 
> Conside the following case, it just write a big file into flash,
> when complete writing, delete the file, and then power off promptly.
> Next time power on, we'll get a replay list like:
> ...
> LEB 1105:211344 len 4144 deletion 0 sqnum 428783 key type 1 inode 80
> LEB 15:233544 len 160 deletion 1 sqnum 428785 key type 0 inode 80
> LEB 1105:215488 len 4144 deletion 0 sqnum 428787 key type 1 inode 80
> ...
> In the replay list, data nodes' deletion are 0, and the inode node's
> deletion is 1. In current logic, the file's dentry will be removed,
> but inode and the flash space it occupied will be reserved.
> User will see that much free space been disappeared.
> 
> We only need to check the deletion value of the following inode type
> node of the replay entry.
> 
> Signed-off-by: Guochun Mao <guochun.mao@...iatek.com>
> ---
>  fs/ubifs/replay.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/ubifs/replay.c b/fs/ubifs/replay.c
> index 0f8a6a16421b..1929ec63a0cb 100644
> --- a/fs/ubifs/replay.c
> +++ b/fs/ubifs/replay.c
> @@ -223,7 +223,8 @@ static bool inode_still_linked(struct ubifs_info *c, struct replay_entry *rino)
>  	 */
>  	list_for_each_entry_reverse(r, &c->replay_list, list) {
>  		ubifs_assert(c, r->sqnum >= rino->sqnum);
> -		if (key_inum(c, &r->key) == key_inum(c, &rino->key))
> +		if (key_inum(c, &r->key) == key_inum(c, &rino->key) &&
> +		    key_type(c, &r->key) == UBIFS_INO_KEY)
>  			return r->deletion == 0;
>  
>  	}