From: Christoph Hellwig <hch@lst.de>
To: Al Viro <viro@zeniv.linux.org.uk>,
Linus Torvalds <torvalds@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org
Subject: [PATCH 05/24] fs: move the putname from filename_lookup to the callers
Date: Mon, 20 Jul 2020 17:58:43 +0200 [thread overview]
Message-ID: <20200720155902.181712-6-hch@lst.de> (raw)
In-Reply-To: <20200720155902.181712-1-hch@lst.de>
This allows reusing the struct filename for retries, and will also allow
pushing the getname up the stack for a few places to allower for better
handling of kernel space filenames.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/fs_parser.c | 1 +
fs/namei.c | 28 ++++++++++++++++++++--------
2 files changed, 21 insertions(+), 8 deletions(-)
diff --git a/fs/fs_parser.c b/fs/fs_parser.c
index ab53e42a874aaa..58d5e53d74eeb7 100644
--- a/fs/fs_parser.c
+++ b/fs/fs_parser.c
@@ -171,6 +171,7 @@ int fs_lookup_param(struct fs_context *fc,
errorf(fc, "%s: Lookup failure for '%s'", param->key, f->name);
goto out;
}
+ putname(f);
if (want_bdev &&
!S_ISBLK(d_backing_inode(_path->dentry)->i_mode)) {
diff --git a/fs/namei.c b/fs/namei.c
index 6ebe400c9736d2..6daffd59e97270 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2372,8 +2372,9 @@ int filename_lookup(int dfd, struct filename *name, unsigned flags,
if (likely(!retval))
audit_inode(name, path->dentry,
flags & LOOKUP_MOUNTPOINT ? AUDIT_INODE_NOEVAL : 0);
+ else
+ putname(name);
restore_nameidata();
- putname(name);
return retval;
}
@@ -2450,8 +2451,12 @@ struct dentry *kern_path_locked(const char *name, struct path *path)
int kern_path(const char *name, unsigned int flags, struct path *path)
{
- return filename_lookup(AT_FDCWD, getname_kernel(name),
- flags, path, NULL);
+ struct filename *f = getname_kernel(name);
+ int ret = filename_lookup(AT_FDCWD, f, flags, path, NULL);
+
+ if (!ret)
+ putname(f);
+ return ret;
}
EXPORT_SYMBOL(kern_path);
@@ -2468,9 +2473,12 @@ int vfs_path_lookup(struct dentry *dentry, struct vfsmount *mnt,
struct path *path)
{
struct path root = {.mnt = mnt, .dentry = dentry};
- /* the first argument of filename_lookup() is ignored with root */
- return filename_lookup(AT_FDCWD, getname_kernel(name),
- flags , path, &root);
+ struct filename *f = getname_kernel(name);
+ int ret = filename_lookup(AT_FDCWD, f, flags, path, &root);
+
+ if (!ret)
+ putname(f);
+ return ret;
}
EXPORT_SYMBOL(vfs_path_lookup);
@@ -2643,8 +2651,12 @@ int path_pts(struct path *path)
int user_path_at_empty(int dfd, const char __user *name, unsigned flags,
struct path *path, int *empty)
{
- return filename_lookup(dfd, getname_flags(name, flags, empty),
- flags, path, NULL);
+ struct filename *f = getname_flags(name, flags, empty);
+ int ret = filename_lookup(dfd, f, flags, path, NULL);
+
+ if (!ret)
+ putname(f);
+ return ret;
}
EXPORT_SYMBOL(user_path_at_empty);
--
2.27.0
next prev parent reply other threads:[~2020-07-20 15:59 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-20 15:58 add file system helpers that take kernel pointers for the init code Christoph Hellwig
2020-07-20 15:58 ` [PATCH 01/24] init: initialize ramdisk_execute_command at compile time Christoph Hellwig
2020-07-20 15:58 ` [PATCH 02/24] fs: add a do_kern_mount helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 03/24] fs: add a kern_umount helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 04/24] fs: move the putname from filename_create to the callers Christoph Hellwig
2020-07-20 18:05 ` Linus Torvalds
2020-07-20 15:58 ` Christoph Hellwig [this message]
2020-07-20 18:11 ` [PATCH 05/24] fs: move the putname from filename_lookup " Al Viro
2020-07-20 15:58 ` [PATCH 06/24] fs: add a kern_chdir helper Christoph Hellwig
2020-07-20 18:17 ` Al Viro
2020-07-20 15:58 ` [PATCH 07/24] fs: add a kern_chroot helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 08/24] fs: add a kern_access helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 09/24] fs: add a kern_chown helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 10/24] fs: move the uid16 (f)chown syscalls to fs/open.c Christoph Hellwig
2020-07-20 15:58 ` [PATCH 11/24] fs: add a kern_chmod helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 12/24] fs: add a kern_utimes helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 13/24] fs: add a kern_mkdir helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 14/24] fs: add a kern_mknod helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 15/24] fs: add a kern_link helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 16/24] fs: add a kern_symlink helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 17/24] fs: add a kern_unlink helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 18/24] fs: add a kern_rmdir helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 19/24] fs: remove vfs_statx_fd Christoph Hellwig
2020-07-20 15:58 ` [PATCH 20/24] fs: implement vfs_stat and vfs_lstat in terms of vfs_fstatat Christoph Hellwig
2020-07-20 15:58 ` [PATCH 21/24] fs: move vfs_fstatat out of line Christoph Hellwig
2020-07-20 15:59 ` [PATCH 22/24] fs: remove vfs_stat_set_lookup_flags Christoph Hellwig
2020-07-20 15:59 ` [PATCH 23/24] fs: remove KSTAT_QUERY_FLAGS Christoph Hellwig
2020-07-20 15:59 ` [PATCH 24/24] fs: add a kern_stat helper Christoph Hellwig
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