[PATCH v2 06/14] namei: clean up do_mkdirat retry logic
From: Dmitry Kadashev <hidden>
Date: 2021-07-15 10:45:59
Also in:
linux-fsdevel
Subsystem:
filesystems (vfs and infrastructure), the rest · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds
No functional changes, just move the main logic to a helper function to make the whole thing easier to follow. Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christian Brauner <redacted> Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/io-uring/CAHk-=wijsw1QSsQHFu_6dEoZEr_zvT7++WJWohcuEkLqqXBGrQ@mail.gmail.com/ (local) Signed-off-by: Dmitry Kadashev <redacted> --- 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