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From: Dmitry Kadashev <[email protected]>
To: Jens Axboe <[email protected]>,
	Alexander Viro <[email protected]>,
	Christian Brauner <[email protected]>,
	Linus Torvalds <[email protected]>
Cc: [email protected], [email protected],
	Dmitry Kadashev <[email protected]>
Subject: [PATCH  06/14] namei: clean up do_mkdirat retry logic
Date: Thu, 15 Jul 2021 17:35:52 +0700	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

No functional changes, just move the main logic to a helper function to
make the whole thing easier to follow.

Cc: Linus Torvalds <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Christian Brauner <[email protected]>
Suggested-by: Linus Torvalds <[email protected]>
Link: https://lore.kernel.org/io-uring/CAHk-=wijsw1QSsQHFu_6dEoZEr_zvT7++WJWohcuEkLqqXBGrQ@mail.gmail.com/
Signed-off-by: Dmitry Kadashev <[email protected]>
---
 fs/namei.c | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 54dbd1e38298..50ab1cd00983 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3850,18 +3850,16 @@ int vfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
 }
 EXPORT_SYMBOL(vfs_mkdir);
 
-int do_mkdirat(int dfd, struct filename *name, umode_t mode)
+static int try_mkdirat(int dfd, struct filename *name, umode_t mode,
+		       unsigned int lookup_flags)
 {
 	struct dentry *dentry;
 	struct path path;
 	int error;
-	unsigned int lookup_flags = LOOKUP_DIRECTORY;
 
-retry:
 	dentry = __filename_create(dfd, name, &path, lookup_flags);
-	error = PTR_ERR(dentry);
 	if (IS_ERR(dentry))
-		goto out;
+		return PTR_ERR(dentry);
 
 	if (!IS_POSIXACL(path.dentry->d_inode))
 		mode &= ~current_umask();
@@ -3873,11 +3871,18 @@ int do_mkdirat(int dfd, struct filename *name, umode_t mode)
 				  mode);
 	}
 	done_path_create(&path, dentry);
-out:
-	if (unlikely(retry_estale(error, lookup_flags))) {
-		lookup_flags |= LOOKUP_REVAL;
-		goto retry;
-	}
+
+	return error;
+}
+
+int do_mkdirat(int dfd, struct filename *name, umode_t mode)
+{
+	int error;
+
+	error = try_mkdirat(dfd, name, mode, 0);
+	if (unlikely(retry_estale(error, 0)))
+		error = try_mkdirat(dfd, name, mode, LOOKUP_REVAL);
+
 	putname(name);
 	return error;
 }
-- 
2.30.2


  parent reply	other threads:[~2021-07-15 10:36 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-15 10:35 [PATCH 00/14] namei: clean up retry logic in various do_* functions Dmitry Kadashev
2021-07-15 10:35 ` [PATCH 01/14] namei: prepare do_rmdir for refactoring Dmitry Kadashev
2021-07-15 19:49   ` Al Viro
2021-07-20  6:52     ` Dmitry Kadashev
2021-07-15 10:35 ` [PATCH 02/14] namei: clean up do_rmdir retry logic Dmitry Kadashev
2021-07-15 20:02   ` Al Viro
2021-07-15 10:35 ` [PATCH 03/14] namei: prepare do_unlinkat for refactoring Dmitry Kadashev
2021-07-15 10:35 ` [PATCH 04/14] namei: clean up do_unlinkat retry logic Dmitry Kadashev
2021-07-15 10:35 ` [PATCH 05/14] namei: prepare do_mkdirat for refactoring Dmitry Kadashev
2021-07-15 20:17   ` Al Viro
2021-07-20  6:59     ` Dmitry Kadashev
2021-07-20 13:55       ` Al Viro
2021-07-21 10:02         ` Dmitry Kadashev
2021-07-15 10:35 ` Dmitry Kadashev [this message]
2021-07-15 10:35 ` [PATCH 07/14] namei: prepare do_mknodat " Dmitry Kadashev
2021-07-15 10:35 ` [PATCH 08/14] namei: clean up do_mknodat retry logic Dmitry Kadashev
2021-07-15 10:35 ` [PATCH 09/14] namei: prepare do_symlinkat for refactoring Dmitry Kadashev
2021-07-15 10:35 ` [PATCH 10/14] namei: clean up do_symlinkat retry logic Dmitry Kadashev
2021-07-15 10:35 ` [PATCH 11/14] namei: prepare do_linkat for refactoring Dmitry Kadashev
2021-07-15 10:35 ` [PATCH 12/14] namei: clean up do_linkat retry logic Dmitry Kadashev
2021-07-15 10:35 ` [PATCH 13/14] namei: prepare do_renameat2 for refactoring Dmitry Kadashev
2021-07-15 10:36 ` [PATCH 14/14] namei: clean up do_renameat2 retry logic Dmitry Kadashev
2021-07-15 10:39 ` [PATCH 00/14] namei: clean up retry logic in various do_* functions Dmitry Kadashev

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