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Implement a kern_pathconf() wrapper for pathconf() which can take the

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filename from either a user space or a kernel space pointer.
This commit is contained in:
jhb 2005-02-07 21:46:43 +00:00
parent 221a30b414
commit 60bd53b164
3 changed files with 28 additions and 14 deletions
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20
sys/kern/vfs_extattr.c
View File

@ -2223,22 +2223,28 @@ pathconf(td, uap)
int name;
} */ *uap;
{
int error;
struct nameidata nd;
int vfslocked;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ | MPSAFE, UIO_USERSPACE,
uap->path, td);
return (kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name));
}
int
kern_pathconf(struct thread *td, char *path, enum uio_seg pathseg, int name)
{
struct nameidata nd;
int error, vfslocked;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ | MPSAFE, pathseg, path,
td);
if ((error = namei(&nd)) != 0)
return (error);
vfslocked = NDHASGIANT(&nd);
NDFREE(&nd, NDF_ONLY_PNBUF);
/* If asynchronous I/O is available, it works for all files. */
if (uap->name == _PC_ASYNC_IO)
if (name == _PC_ASYNC_IO)
td->td_retval[0] = async_io_version;
else
error = VOP_PATHCONF(nd.ni_vp, uap->name, td->td_retval);
error = VOP_PATHCONF(nd.ni_vp, name, td->td_retval);
vput(nd.ni_vp);
VFS_UNLOCK_GIANT(vfslocked);
return (error);

20
sys/kern/vfs_syscalls.c
View File

@ -2223,22 +2223,28 @@ pathconf(td, uap)
int name;
} */ *uap;
{
int error;
struct nameidata nd;
int vfslocked;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ | MPSAFE, UIO_USERSPACE,
uap->path, td);
return (kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name));
}
int
kern_pathconf(struct thread *td, char *path, enum uio_seg pathseg, int name)
{
struct nameidata nd;
int error, vfslocked;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ | MPSAFE, pathseg, path,
td);
if ((error = namei(&nd)) != 0)
return (error);
vfslocked = NDHASGIANT(&nd);
NDFREE(&nd, NDF_ONLY_PNBUF);
/* If asynchronous I/O is available, it works for all files. */
if (uap->name == _PC_ASYNC_IO)
if (name == _PC_ASYNC_IO)
td->td_retval[0] = async_io_version;
else
error = VOP_PATHCONF(nd.ni_vp, uap->name, td->td_retval);
error = VOP_PATHCONF(nd.ni_vp, name, td->td_retval);
vput(nd.ni_vp);
VFS_UNLOCK_GIANT(vfslocked);
return (error);

2
sys/sys/syscallsubr.h
View File

@ -88,6 +88,8 @@ int kern_nanosleep(struct thread *td, struct timespec *rqt,
struct timespec *rmt);
int kern_open(struct thread *td, char *path, enum uio_seg pathseg,
int flags, int mode);
int kern_pathconf(struct thread *td, char *path, enum uio_seg pathseg,
int name);
int kern_ptrace(struct thread *td, int req, pid_t pid, void *addr,
int data);
int kern_readlink(struct thread *td, char *path, enum uio_seg pathseg,