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 04/14] namei: clean up do_unlinkat retry logic
Date: Thu, 15 Jul 2021 17:35:50 +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 | 42 ++++++++++++++++++++++++------------------
1 file changed, 24 insertions(+), 18 deletions(-)
diff --git a/fs/namei.c b/fs/namei.c
index 6253486718d5..703cce40d597 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -4091,7 +4091,9 @@ EXPORT_SYMBOL(vfs_unlink);
* writeout happening, and we don't want to prevent access to the directory
* while waiting on the I/O.
*/
-int do_unlinkat(int dfd, struct filename *name)
+
+static int try_unlinkat(int dfd, struct filename *name,
+ unsigned int lookup_flags)
{
int error;
struct dentry *dentry;
@@ -4100,19 +4102,18 @@ int do_unlinkat(int dfd, struct filename *name)
int type;
struct inode *inode = NULL;
struct inode *delegated_inode = NULL;
- unsigned int lookup_flags = 0;
-retry:
+
error = __filename_parentat(dfd, name, lookup_flags, &path, &last, &type);
if (error)
- goto exit1;
+ return error;
error = -EISDIR;
if (type != LAST_NORM)
- goto exit2;
+ goto exit1;
error = mnt_want_write(path.mnt);
if (error)
- goto exit2;
+ goto exit1;
retry_deleg:
inode_lock_nested(path.dentry->d_inode, I_MUTEX_PARENT);
dentry = __lookup_hash(&last, path.dentry, lookup_flags);
@@ -4129,11 +4130,11 @@ int do_unlinkat(int dfd, struct filename *name)
ihold(inode);
error = security_path_unlink(&path, dentry);
if (error)
- goto exit3;
+ goto exit2;
mnt_userns = mnt_user_ns(path.mnt);
error = vfs_unlink(mnt_userns, path.dentry->d_inode, dentry,
&delegated_inode);
-exit3:
+exit2:
dput(dentry);
}
inode_unlock(path.dentry->d_inode);
@@ -4146,17 +4147,9 @@ int do_unlinkat(int dfd, struct filename *name)
goto retry_deleg;
}
mnt_drop_write(path.mnt);
-exit2:
- path_put(&path);
exit1:
- if (unlikely(retry_estale(error, lookup_flags))) {
- lookup_flags |= LOOKUP_REVAL;
- inode = NULL;
- goto retry;
- }
- putname(name);
+ path_put(&path);
return error;
-
slashes:
if (d_is_negative(dentry))
error = -ENOENT;
@@ -4164,7 +4157,20 @@ int do_unlinkat(int dfd, struct filename *name)
error = -EISDIR;
else
error = -ENOTDIR;
- goto exit3;
+ goto exit2;
+}
+
+int do_unlinkat(int dfd, struct filename *name)
+{
+ int error;
+
+ error = try_unlinkat(dfd, name, 0);
+ if (unlikely(retry_estale(error, 0)))
+ error = try_unlinkat(dfd, name, LOOKUP_REVAL);
+
+ putname(name);
+ return error;
+
}
SYSCALL_DEFINE3(unlinkat, int, dfd, const char __user *, pathname, int, flag)
--
2.30.2
next prev 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 ` Dmitry Kadashev [this message]
2021-07-15 10:35 ` [PATCH 05/14] namei: prepare do_mkdirat " 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 ` [PATCH 06/14] namei: clean up do_mkdirat retry logic Dmitry Kadashev
2021-07-15 10:35 ` [PATCH 07/14] namei: prepare do_mknodat for refactoring 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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