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 v2 02/14] namei: clean up do_rmdir retry logic
Date: Thu, 15 Jul 2021 17:45:24 +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-=wh=cpt_tQCirzFZRPawRpbuFTZ2MxNpXiyUF+eBXF=+sw@mail.gmail.com/
Signed-off-by: Dmitry Kadashev <[email protected]>
---
fs/namei.c | 44 +++++++++++++++++++++++++-------------------
1 file changed, 25 insertions(+), 19 deletions(-)
diff --git a/fs/namei.c b/fs/namei.c
index 99d5c3a4c12e..fbae4e9fcf53 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3947,7 +3947,7 @@ int vfs_rmdir(struct user_namespace *mnt_userns, struct inode *dir,
}
EXPORT_SYMBOL(vfs_rmdir);
-int do_rmdir(int dfd, struct filename *name)
+static int try_rmdir(int dfd, struct filename *name, unsigned int lookup_flags)
{
struct user_namespace *mnt_userns;
int error;
@@ -3955,54 +3955,60 @@ int do_rmdir(int dfd, struct filename *name)
struct path path;
struct qstr last;
int type;
- unsigned int lookup_flags = 0;
-retry:
+
error = __filename_parentat(dfd, name, lookup_flags, &path, &last, &type);
if (error)
- goto exit1;
+ return error;
switch (type) {
case LAST_DOTDOT:
error = -ENOTEMPTY;
- goto exit2;
+ goto exit1;
case LAST_DOT:
error = -EINVAL;
- goto exit2;
+ goto exit1;
case LAST_ROOT:
error = -EBUSY;
- goto exit2;
+ goto exit1;
}
error = mnt_want_write(path.mnt);
if (error)
- goto exit2;
+ goto exit1;
inode_lock_nested(path.dentry->d_inode, I_MUTEX_PARENT);
dentry = __lookup_hash(&last, path.dentry, lookup_flags);
error = PTR_ERR(dentry);
if (IS_ERR(dentry))
- goto exit3;
+ goto exit2;
if (!dentry->d_inode) {
error = -ENOENT;
- goto exit4;
+ goto exit3;
}
error = security_path_rmdir(&path, dentry);
if (error)
- goto exit4;
+ goto exit3;
mnt_userns = mnt_user_ns(path.mnt);
error = vfs_rmdir(mnt_userns, path.dentry->d_inode, dentry);
-exit4:
- dput(dentry);
exit3:
+ dput(dentry);
+exit2:
inode_unlock(path.dentry->d_inode);
mnt_drop_write(path.mnt);
-exit2:
- path_put(&path);
exit1:
- if (unlikely(retry_estale(error, lookup_flags))) {
- lookup_flags |= LOOKUP_REVAL;
- goto retry;
- }
+ path_put(&path);
+
+ return error;
+}
+
+int do_rmdir(int dfd, struct filename *name)
+{
+ int error;
+
+ error = try_rmdir(dfd, name, 0);
+ if (unlikely(retry_estale(error, 0)))
+ error = try_rmdir(dfd, name, LOOKUP_REVAL);
+
putname(name);
return error;
}
--
2.30.2
next prev parent reply other threads:[~2021-07-15 10:45 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-15 10:45 [PATCH v2 00/14] namei: clean up retry logic in various do_* functions Dmitry Kadashev
2021-07-15 10:45 ` [PATCH v2 01/14] namei: prepare do_rmdir for refactoring Dmitry Kadashev
2021-07-15 10:45 ` Dmitry Kadashev [this message]
2021-07-15 10:45 ` [PATCH v2 03/14] namei: prepare do_unlinkat " Dmitry Kadashev
2021-07-15 10:45 ` [PATCH v2 04/14] namei: clean up do_unlinkat retry logic Dmitry Kadashev
2021-07-15 10:45 ` [PATCH v2 05/14] namei: prepare do_mkdirat for refactoring Dmitry Kadashev
2021-07-15 10:45 ` [PATCH v2 06/14] namei: clean up do_mkdirat retry logic Dmitry Kadashev
2021-07-15 10:45 ` [PATCH v2 07/14] namei: prepare do_mknodat for refactoring Dmitry Kadashev
2021-07-15 10:45 ` [PATCH v2 08/14] namei: clean up do_mknodat retry logic Dmitry Kadashev
2021-07-15 10:45 ` [PATCH v2 09/14] namei: prepare do_symlinkat for refactoring Dmitry Kadashev
2021-07-15 10:45 ` [PATCH v2 10/14] namei: clean up do_symlinkat retry logic Dmitry Kadashev
2021-07-15 10:45 ` [PATCH v2 11/14] namei: prepare do_linkat for refactoring Dmitry Kadashev
2021-07-15 10:45 ` [PATCH v2 12/14] namei: clean up do_linkat retry logic Dmitry Kadashev
2021-07-15 10:45 ` [PATCH v2 13/14] namei: prepare do_renameat2 for refactoring Dmitry Kadashev
2021-07-15 10:45 ` [PATCH v2 14/14] namei: clean up do_renameat2 retry logic Dmitry Kadashev
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