From: "J. Bruce Fields" <bfields-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
To: Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org,
linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
michael.brantley-Iq/kdjr4a97QT0dZR+AlfA@public.gmane.org,
hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org,
miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org,
pstaubach-83r9SdEf25FBDgjK7y7TUQ@public.gmane.org
Subject: Re: [PATCH v8 11/32] vfs: make do_unlinkat retry on ESTALE errors
Date: Tue, 30 Oct 2012 12:14:29 -0400 [thread overview]
Message-ID: <20121030161429.GD24618@fieldses.org> (raw)
In-Reply-To: <1351341219-17837-12-git-send-email-jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
On Sat, Oct 27, 2012 at 08:33:18AM -0400, Jeff Layton wrote:
> Signed-off-by: Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
> fs/namei.c | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/fs/namei.c b/fs/namei.c
> index 7c9bb50..467b9f1 100644
> --- a/fs/namei.c
> +++ b/fs/namei.c
> @@ -3446,9 +3446,13 @@ static long do_unlinkat(int dfd, const char __user *pathname)
> struct filename *name;
> struct dentry *dentry;
> struct nameidata nd;
> - struct inode *inode = NULL;
> + struct inode *inode;
> + unsigned int try = 0;
> + unsigned int lookup_flags = LOOKUP_PARENT;
>
> - name = user_path_parent(dfd, pathname, &nd, 0);
> +retry:
> + inode = NULL;
So, you fail after "inode" was set (say vfs_unlink returned an error)
the first time, then before "inode" was set (lookup_hash returns an
error), and you end up incorrectly doing another iput() the second time
through if you don't reset inode here?
(I think I made the same mistake in another patch, actually....)
--b.
> + name = user_path_parent(dfd, pathname, &nd, try);
> if (IS_ERR(name))
> return PTR_ERR(name);
>
> @@ -3486,6 +3490,10 @@ exit2:
> exit1:
> path_put(&nd.path);
> putname(name);
> + if (retry_estale(error, try++)) {
> + lookup_flags |= LOOKUP_REVAL;
> + goto retry;
> + }
> return error;
>
> slashes:
> --
> 1.7.11.7
>
> --
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next prev parent reply other threads:[~2012-10-30 16:14 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-27 12:33 [PATCH v8 00/32] vfs: add the ability to retry lookup and operation to most path-based syscalls Jeff Layton
2012-10-27 12:33 ` [PATCH v8 01/32] vfs: add a retry_estale helper function to handle retries on ESTALE Jeff Layton
2012-10-27 12:33 ` [PATCH v8 02/32] vfs: make fstatat retry on ESTALE errors from getattr call Jeff Layton
2012-10-27 12:33 ` [PATCH v8 03/32] vfs: fix readlinkat to retry on ESTALE Jeff Layton
2012-10-27 12:33 ` [PATCH v8 04/32] vfs: add new "reval" argument to kern_path_create and user_path_create Jeff Layton
2012-10-27 12:33 ` [PATCH v8 05/32] vfs: fix mknodat to retry on ESTALE errors Jeff Layton
[not found] ` <1351341219-17837-1-git-send-email-jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-10-27 12:33 ` [PATCH v8 06/32] vfs: fix mkdir " Jeff Layton
2012-10-27 12:33 ` [PATCH v8 10/32] vfs: make rmdir " Jeff Layton
2012-10-27 12:33 ` [PATCH v8 16/32] vfs: make chroot retry once on ESTALE error Jeff Layton
2012-10-27 12:33 ` [PATCH v8 21/32] vfs: allow setxattr to retry once on ESTALE errors Jeff Layton
2012-10-27 12:33 ` [PATCH v8 22/32] vfs: allow lsetxattr() " Jeff Layton
2012-10-27 12:33 ` [PATCH v8 32/32] vfs: make number of ESTALE retries tunable Jeff Layton
2012-10-27 12:33 ` [PATCH v8 07/32] vfs: fix symlinkat to retry on ESTALE errors Jeff Layton
2012-10-27 12:33 ` [PATCH v8 08/32] vfs: fix linkat " Jeff Layton
2012-10-27 12:33 ` [PATCH v8 09/32] vfs: add a reval argument to user_path_parent Jeff Layton
2012-10-27 12:33 ` [PATCH v8 11/32] vfs: make do_unlinkat retry on ESTALE errors Jeff Layton
[not found] ` <1351341219-17837-12-git-send-email-jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-10-30 16:14 ` J. Bruce Fields [this message]
[not found] ` <20121030161429.GD24618-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2012-10-30 16:33 ` Jeff Layton
[not found] ` <20121030123355.5c404373-9yPaYZwiELC+kQycOl6kW4xkIHaj4LzF@public.gmane.org>
2012-10-30 19:28 ` J. Bruce Fields
[not found] ` <20121030192809.GE24618-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2012-10-30 19:45 ` Jeff Layton
2012-10-27 12:33 ` [PATCH v8 12/32] vfs: fix renameat to " Jeff Layton
2012-10-27 12:33 ` [PATCH v8 13/32] vfs: have do_sys_truncate retry once on an ESTALE error Jeff Layton
2012-10-27 12:33 ` [PATCH v8 14/32] vfs: have faccessat " Jeff Layton
2012-10-27 12:33 ` [PATCH v8 15/32] vfs: have chdir retry lookup and call once on " Jeff Layton
2012-10-27 12:33 ` [PATCH v8 17/32] vfs: make fchmodat retry once on ESTALE errors Jeff Layton
2012-10-27 12:33 ` [PATCH v8 18/32] vfs: make fchownat " Jeff Layton
2012-10-27 12:33 ` [PATCH v8 19/32] vfs: fix user_statfs to " Jeff Layton
2012-10-27 12:33 ` [PATCH v8 20/32] vfs: allow utimensat() calls to retry once on an ESTALE error Jeff Layton
2012-10-27 12:33 ` [PATCH v8 23/32] vfs: make getxattr " Jeff Layton
2012-10-27 12:33 ` [PATCH v8 24/32] vfs: make lgetxattr retry once on ESTALE Jeff Layton
2012-10-27 12:33 ` [PATCH v8 25/32] vfs: make listxattr retry once on ESTALE error Jeff Layton
2012-10-27 12:33 ` [PATCH v8 26/32] vfs: make llistxattr " Jeff Layton
2012-10-27 12:33 ` [PATCH v8 27/32] vfs: make removexattr retry once on ESTALE Jeff Layton
2012-10-27 12:33 ` [PATCH v8 28/32] vfs: make lremovexattr retry once on ESTALE error Jeff Layton
2012-10-27 12:33 ` [PATCH v8 29/32] vfs: convert do_filp_open to use retry_estale helper Jeff Layton
2012-10-27 12:33 ` [PATCH v8 30/32] vfs: convert do_file_open_root " Jeff Layton
2012-10-27 12:33 ` [PATCH v8 31/32] vfs: convert filename_lookup " Jeff Layton
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