From: Eric Biggers <ebiggers@kernel.org>
To: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: kernel-team@android.com, linux-kernel@vger.kernel.org,
linux-f2fs-devel@lists.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH] f2fs: get parent inode when recovering pino
Date: Tue, 5 May 2020 09:58:47 -0700 [thread overview]
Message-ID: <20200505165847.GA98848@gmail.com> (raw)
In-Reply-To: <20200505153139.201697-1-jaegeuk@kernel.org>
On Tue, May 05, 2020 at 08:31:39AM -0700, Jaegeuk Kim wrote:
> We had to grab the inode before retrieving i_ino.
>
> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
> ---
> fs/f2fs/file.c | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index a0a4413d6083b..9d4c3e3503567 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -168,6 +168,7 @@ static const struct vm_operations_struct f2fs_file_vm_ops = {
> static int get_parent_ino(struct inode *inode, nid_t *pino)
> {
> struct dentry *dentry;
> + struct inode *parent;
>
> inode = igrab(inode);
> dentry = d_find_any_alias(inode);
> @@ -175,8 +176,13 @@ static int get_parent_ino(struct inode *inode, nid_t *pino)
> if (!dentry)
> return 0;
>
> - *pino = parent_ino(dentry);
> + parent = igrab(d_inode(dentry->d_parent));
> dput(dentry);
> + if (!parent)
> + return 0;
> +
> + *pino = parent->i_ino;
> + iput(parent);
> return 1;
This doesn't appear to be necessary. parent_ino() is:
spin_lock(&dentry->d_lock);
res = dentry->d_parent->d_inode->i_ino;
spin_unlock(&dentry->d_lock);
Since dentry is locked and referenced, ->d_parent is stable and positive.
In the encrypt+casefold patch I was reviewing, it's indeed necessary, but only
because there was a check of inode->i_flags added outside the locked region.
The following would be simpler:
spin_lock(&dentry->d_lock);
dir = dentry->d_parent->d_inode;
*pino = dir->i_ino;
needs_recovery = IS_ENCRYPTED(dir) && IS_CASEFOLDED(dir);
spin_unlock(&dentry->d_lock);
BTW, d_find_any_alias() is unnecessary too. This code should just be using
file_dentry(file) from f2fs_do_sync_file().
- Eric
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next prev parent reply other threads:[~2020-05-05 16:59 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-05 15:31 [f2fs-dev] [PATCH] f2fs: get parent inode when recovering pino Jaegeuk Kim
2020-05-05 16:58 ` Eric Biggers [this message]
2020-05-05 17:59 ` Eric Biggers
2020-05-05 18:20 ` Jaegeuk Kim
2020-05-05 18:13 ` Jaegeuk Kim
2020-05-05 18:19 ` Eric Biggers
2020-05-05 18:49 ` Jaegeuk Kim
2020-05-05 19:01 ` Eric Biggers
2020-05-05 19:08 ` Jaegeuk Kim
2020-05-06 0:14 ` Gao Xiang
2020-05-06 1:24 ` Eric Biggers
2020-05-06 1:58 ` Gao Xiang via Linux-f2fs-devel
2020-05-06 6:47 ` Gao Xiang
2020-05-06 19:16 ` Eric Biggers
2020-05-06 22:36 ` Gao Xiang
2020-05-07 6:38 ` Chao Yu
2020-05-07 7:23 ` Gao Xiang
2020-05-06 6:55 ` Chao Yu
2020-05-07 6:30 ` Chao Yu
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