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non-consuming variant of do_mknodat()

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similar to previous commit; replacement is filename_mknodat()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2026-01-06 23:30:02 -05:00
parent dc912db15a
commit 88fdc27617
4 changed files with 12 additions and 12 deletions
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2
Documentation/filesystems/porting.rst
View file

@ -1343,4 +1343,4 @@ fs/namei.c primitives that consume filesystem references (do_renameat2(),
do_linkat(), do_symlinkat(), do_mkdirat(), do_mknodat(), do_unlinkat()
and do_rmdir()) are getting replaced with non-consuming analogues
(filename_renameat2(), etc.) Replaced so far: do_renameat2(), do_linkat(),
do_symlinkat(), do_mkdirat().
do_symlinkat(), do_mkdirat(), do_mknodat().

3
fs/init.c
View file

@ -140,7 +140,8 @@ int __init init_stat(const char *filename, struct kstat *stat, int flags)
int __init init_mknod(const char *filename, umode_t mode, unsigned int dev)
{
return do_mknodat(AT_FDCWD, getname_kernel(filename), mode, dev);
CLASS(filename_kernel, name)(filename);
return filename_mknodat(AT_FDCWD, name, mode, dev);
}
int __init init_link(const char *oldname, const char *newname)

2
fs/internal.h
View file

@ -60,7 +60,7 @@ int may_linkat(struct mnt_idmap *idmap, const struct path *link);
int filename_renameat2(int olddfd, struct filename *oldname, int newdfd,
struct filename *newname, unsigned int flags);
int filename_mkdirat(int dfd, struct filename *name, umode_t mode);
int do_mknodat(int dfd, struct filename *name, umode_t mode, unsigned int dev);
int filename_mknodat(int dfd, struct filename *name, umode_t mode, unsigned int dev);
int filename_symlinkat(struct filename *from, int newdfd, struct filename *to);
int filename_linkat(int olddfd, struct filename *old, int newdfd,
struct filename *new, int flags);

17
fs/namei.c
View file

@ -5072,8 +5072,8 @@ static int may_mknod(umode_t mode)
}
}
int do_mknodat(int dfd, struct filename *name, umode_t mode,
unsigned int dev)
int filename_mknodat(int dfd, struct filename *name, umode_t mode,
unsigned int dev)
{
struct delegated_inode di = { };
struct mnt_idmap *idmap;
@ -5084,12 +5084,11 @@ int do_mknodat(int dfd, struct filename *name, umode_t mode,
error = may_mknod(mode);
if (error)
goto out1;
return error;
retry:
dentry = filename_create(dfd, name, &path, lookup_flags);
error = PTR_ERR(dentry);
if (IS_ERR(dentry))
goto out1;
return PTR_ERR(dentry);
error = security_path_mknod(&path, dentry,
mode_strip_umask(path.dentry->d_inode, mode), dev);
@ -5123,20 +5122,20 @@ out2:
lookup_flags |= LOOKUP_REVAL;
goto retry;
}
out1:
putname(name);
return error;
}
SYSCALL_DEFINE4(mknodat, int, dfd, const char __user *, filename, umode_t, mode,
unsigned int, dev)
{
return do_mknodat(dfd, getname(filename), mode, dev);
CLASS(filename, name)(filename);
return filename_mknodat(dfd, name, mode, dev);
}
SYSCALL_DEFINE3(mknod, const char __user *, filename, umode_t, mode, unsigned, dev)
{
return do_mknodat(AT_FDCWD, getname(filename), mode, dev);
CLASS(filename, name)(filename);
return filename_mknodat(AT_FDCWD, name, mode, dev);
}
/**