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Wed, 1 Sep 2021 17:51:50 +0000 From: Stephen Brennan To: Alexander Viro Cc: Stephen Brennan , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/3] namei: Standardize callers of filename_lookup() Date: Wed, 1 Sep 2021 10:51:42 -0700 Message-Id: <20210901175144.121048-3-stephen.s.brennan@oracle.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210901175144.121048-1-stephen.s.brennan@oracle.com> References: <20210901175144.121048-1-stephen.s.brennan@oracle.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SJ0PR05CA0131.namprd05.prod.outlook.com (2603:10b6:a03:33d::16) To CH2PR10MB4166.namprd10.prod.outlook.com (2603:10b6:610:78::20) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost (148.87.23.10) by SJ0PR05CA0131.namprd05.prod.outlook.com (2603:10b6:a03:33d::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4478.11 via Frontend Transport; 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This can be confusing as it's unusual to drop a caller's reference. Remove filename_lookup, rename __filename_lookup to filename_lookup, and convert all callers. The cost is a few slightly longer functions, but the clarity is greater. Link: https://lore.kernel.org/linux-fsdevel/YS+dstZ3xfcLxhoB@zeniv-ca.linux.org.uk/ Cc: Christoph Hellwig Cc: Al Viro Signed-off-by: Stephen Brennan --- fs/fs_parser.c | 1 - fs/namei.c | 41 ++++++++++++++++++++++++----------------- 2 files changed, 24 insertions(+), 18 deletions(-) diff --git a/fs/fs_parser.c b/fs/fs_parser.c index 980d44fd3a36..3df07c0e32b3 100644 --- a/fs/fs_parser.c +++ b/fs/fs_parser.c @@ -165,7 +165,6 @@ int fs_lookup_param(struct fs_context *fc, return invalf(fc, "%s: not usable as path", param->key); } - f->refcnt++; /* filename_lookup() drops our ref. */ ret = filename_lookup(param->dirfd, f, flags, _path, NULL); if (ret < 0) { errorf(fc, "%s: Lookup failure for '%s'", param->key, f->name); diff --git a/fs/namei.c b/fs/namei.c index f2af301cc79f..76871b7f127a 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -2467,7 +2467,7 @@ static int path_lookupat(struct nameidata *nd, unsigned flags, struct path *path return err; } -static int __filename_lookup(int dfd, struct filename *name, unsigned flags, +int filename_lookup(int dfd, struct filename *name, unsigned flags, struct path *path, struct path *root) { int retval; @@ -2488,15 +2488,6 @@ static int __filename_lookup(int dfd, struct filename *name, unsigned flags, return retval; } -int filename_lookup(int dfd, struct filename *name, unsigned flags, - struct path *path, struct path *root) -{ - int retval = __filename_lookup(dfd, name, flags, path, root); - - putname(name); - return retval; -} - /* Returns 0 and nd will be valid on success; Retuns error, otherwise. */ static int path_parentat(struct nameidata *nd, unsigned flags, struct path *parent) @@ -2571,8 +2562,14 @@ 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 *filename; + int ret; + + filename = getname_kernel(name); + ret = filename_lookup(AT_FDCWD, filename, flags, path, NULL); + putname(filename); + return ret; + } EXPORT_SYMBOL(kern_path); @@ -2588,10 +2585,15 @@ int vfs_path_lookup(struct dentry *dentry, struct vfsmount *mnt, const char *name, unsigned int flags, struct path *path) { + struct filename *filename; struct path root = {.mnt = mnt, .dentry = dentry}; + int ret; + + filename = getname_kernel(name); /* the first argument of filename_lookup() is ignored with root */ - return filename_lookup(AT_FDCWD, getname_kernel(name), - flags , path, &root); + ret = filename_lookup(AT_FDCWD, filename, flags, path, &root); + putname(filename); + return ret; } EXPORT_SYMBOL(vfs_path_lookup); @@ -2795,8 +2797,13 @@ 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 *filename; + int ret; + + filename = getname_flags(name, flags, empty); + ret = filename_lookup(dfd, filename, flags, path, NULL); + putname(filename); + return ret; } EXPORT_SYMBOL(user_path_at_empty); @@ -4421,7 +4428,7 @@ int do_linkat(int olddfd, struct filename *old, int newdfd, if (flags & AT_SYMLINK_FOLLOW) how |= LOOKUP_FOLLOW; retry: - error = __filename_lookup(olddfd, old, how, &old_path, NULL); + error = filename_lookup(olddfd, old, how, &old_path, NULL); if (error) goto out_putnames; -- 2.30.2