Extend kobj compatibility KPI to support operating on files before and
after the root file system is mounted. This is one of the changes that will allow to put root file system on ZFS.
This commit is contained in:
parent
df3aed4f96
commit
bdebccf9b9
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=168508
@ -30,12 +30,13 @@ __FBSDID("$FreeBSD$");
|
||||
#include <sys/types.h>
|
||||
#include <sys/systm.h>
|
||||
#include <sys/kernel.h>
|
||||
#include <sys/systm.h>
|
||||
#include <sys/kthread.h>
|
||||
#include <sys/namei.h>
|
||||
#include <sys/proc.h>
|
||||
#include <sys/filedesc.h>
|
||||
#include <sys/vnode.h>
|
||||
#include <sys/fcntl.h>
|
||||
#include <sys/linker.h>
|
||||
#include <sys/kobj.h>
|
||||
|
||||
void
|
||||
@ -62,8 +63,8 @@ kobj_zalloc(size_t size, int flag)
|
||||
return (p);
|
||||
}
|
||||
|
||||
struct _buf *
|
||||
kobj_open_file(const char *file)
|
||||
static void *
|
||||
kobj_open_file_vnode(const char *file)
|
||||
{
|
||||
struct thread *td = curthread;
|
||||
struct nameidata nd;
|
||||
@ -79,16 +80,45 @@ kobj_open_file(const char *file)
|
||||
error = vn_open_cred(&nd, &flags, 0, td->td_ucred, -1);
|
||||
NDFREE(&nd, NDF_ONLY_PNBUF);
|
||||
if (error != 0)
|
||||
return ((struct _buf *)-1);
|
||||
return (NULL);
|
||||
/* We just unlock so we hold a reference. */
|
||||
VOP_UNLOCK(nd.ni_vp, 0, td);
|
||||
return ((struct _buf *)nd.ni_vp);
|
||||
return (nd.ni_vp);
|
||||
}
|
||||
|
||||
int
|
||||
kobj_get_filesize(struct _buf *file, uint64_t *size)
|
||||
static void *
|
||||
kobj_open_file_loader(const char *file)
|
||||
{
|
||||
struct vnode *vp = (struct vnode *)file;
|
||||
|
||||
return (preload_search_by_name(file));
|
||||
}
|
||||
|
||||
struct _buf *
|
||||
kobj_open_file(const char *file)
|
||||
{
|
||||
struct _buf *out;
|
||||
|
||||
out = kmem_alloc(sizeof(*out), KM_SLEEP);
|
||||
out->mounted = root_mounted();
|
||||
/*
|
||||
* If root is already mounted we read file using file system,
|
||||
* if not, we use loader.
|
||||
*/
|
||||
if (out->mounted)
|
||||
out->ptr = kobj_open_file_vnode(file);
|
||||
else
|
||||
out->ptr = kobj_open_file_loader(file);
|
||||
if (out->ptr == NULL) {
|
||||
kmem_free(out, sizeof(*out));
|
||||
return ((struct _buf *)-1);
|
||||
}
|
||||
return (out);
|
||||
}
|
||||
|
||||
static int
|
||||
kobj_get_filesize_vnode(struct _buf *file, uint64_t *size)
|
||||
{
|
||||
struct vnode *vp = file->ptr;
|
||||
struct thread *td = curthread;
|
||||
struct vattr va;
|
||||
int error;
|
||||
@ -101,10 +131,32 @@ kobj_get_filesize(struct _buf *file, uint64_t *size)
|
||||
return (error);
|
||||
}
|
||||
|
||||
int
|
||||
kobj_read_file(struct _buf *file, char *buf, unsigned size, unsigned off)
|
||||
static int
|
||||
kobj_get_filesize_loader(struct _buf *file, uint64_t *size)
|
||||
{
|
||||
struct vnode *vp = (struct vnode *)file;
|
||||
void *ptr;
|
||||
|
||||
ptr = preload_search_info(file->ptr, MODINFO_SIZE);
|
||||
if (ptr == NULL)
|
||||
return (ENOENT);
|
||||
*size = (uint64_t)*(size_t *)ptr;
|
||||
return (0);
|
||||
}
|
||||
|
||||
int
|
||||
kobj_get_filesize(struct _buf *file, uint64_t *size)
|
||||
{
|
||||
|
||||
if (file->mounted)
|
||||
return (kobj_get_filesize_vnode(file, size));
|
||||
else
|
||||
return (kobj_get_filesize_loader(file, size));
|
||||
}
|
||||
|
||||
int
|
||||
kobj_read_file_vnode(struct _buf *file, char *buf, unsigned size, unsigned off)
|
||||
{
|
||||
struct vnode *vp = file->ptr;
|
||||
struct thread *td = curthread;
|
||||
struct uio auio;
|
||||
struct iovec aiov;
|
||||
@ -130,13 +182,39 @@ kobj_read_file(struct _buf *file, char *buf, unsigned size, unsigned off)
|
||||
return (error != 0 ? -1 : size - auio.uio_resid);
|
||||
}
|
||||
|
||||
int
|
||||
kobj_read_file_loader(struct _buf *file, char *buf, unsigned size, unsigned off)
|
||||
{
|
||||
char *ptr;
|
||||
|
||||
ptr = preload_search_info(file->ptr, MODINFO_ADDR);
|
||||
if (ptr == NULL)
|
||||
return (ENOENT);
|
||||
ptr = *(void **)ptr;
|
||||
bcopy(ptr + off, buf, size);
|
||||
return (0);
|
||||
}
|
||||
|
||||
int
|
||||
kobj_read_file(struct _buf *file, char *buf, unsigned size, unsigned off)
|
||||
{
|
||||
|
||||
if (file->mounted)
|
||||
return (kobj_read_file_vnode(file, buf, size, off));
|
||||
else
|
||||
return (kobj_read_file_loader(file, buf, size, off));
|
||||
}
|
||||
|
||||
void
|
||||
kobj_close_file(struct _buf *file)
|
||||
{
|
||||
struct vnode *vp = (struct vnode *)file;
|
||||
struct thread *td = curthread;
|
||||
int flags;
|
||||
|
||||
flags = FREAD;
|
||||
vn_close(vp, flags, td->td_ucred, td);
|
||||
if (file->mounted) {
|
||||
struct vnode *vp = file->ptr;
|
||||
struct thread *td = curthread;
|
||||
int flags = FREAD;
|
||||
|
||||
vn_close(vp, flags, td->td_ucred, td);
|
||||
}
|
||||
kmem_free(file, sizeof(*file));
|
||||
}
|
||||
|
@ -31,6 +31,13 @@
|
||||
|
||||
#include <sys/types.h>
|
||||
#include <sys/kmem.h>
|
||||
#include_next <sys/kobj.h>
|
||||
#ifdef AT_UID
|
||||
#undef AT_UID
|
||||
#endif
|
||||
#ifdef AT_GID
|
||||
#undef AT_GID
|
||||
#endif
|
||||
#include <sys/vnode.h>
|
||||
|
||||
#define KM_NOWAIT 0x01
|
||||
@ -41,7 +48,8 @@ void *kobj_alloc(size_t size, int flag);
|
||||
void *kobj_zalloc(size_t size, int flag);
|
||||
|
||||
struct _buf {
|
||||
void *dummy;
|
||||
void *ptr;
|
||||
int mounted;
|
||||
};
|
||||
|
||||
struct _buf *kobj_open_file(const char *path);
|
||||
|
@ -30,12 +30,13 @@ __FBSDID("$FreeBSD$");
|
||||
#include <sys/types.h>
|
||||
#include <sys/systm.h>
|
||||
#include <sys/kernel.h>
|
||||
#include <sys/systm.h>
|
||||
#include <sys/kthread.h>
|
||||
#include <sys/namei.h>
|
||||
#include <sys/proc.h>
|
||||
#include <sys/filedesc.h>
|
||||
#include <sys/vnode.h>
|
||||
#include <sys/fcntl.h>
|
||||
#include <sys/linker.h>
|
||||
#include <sys/kobj.h>
|
||||
|
||||
void
|
||||
@ -62,8 +63,8 @@ kobj_zalloc(size_t size, int flag)
|
||||
return (p);
|
||||
}
|
||||
|
||||
struct _buf *
|
||||
kobj_open_file(const char *file)
|
||||
static void *
|
||||
kobj_open_file_vnode(const char *file)
|
||||
{
|
||||
struct thread *td = curthread;
|
||||
struct nameidata nd;
|
||||
@ -79,16 +80,45 @@ kobj_open_file(const char *file)
|
||||
error = vn_open_cred(&nd, &flags, 0, td->td_ucred, -1);
|
||||
NDFREE(&nd, NDF_ONLY_PNBUF);
|
||||
if (error != 0)
|
||||
return ((struct _buf *)-1);
|
||||
return (NULL);
|
||||
/* We just unlock so we hold a reference. */
|
||||
VOP_UNLOCK(nd.ni_vp, 0, td);
|
||||
return ((struct _buf *)nd.ni_vp);
|
||||
return (nd.ni_vp);
|
||||
}
|
||||
|
||||
int
|
||||
kobj_get_filesize(struct _buf *file, uint64_t *size)
|
||||
static void *
|
||||
kobj_open_file_loader(const char *file)
|
||||
{
|
||||
struct vnode *vp = (struct vnode *)file;
|
||||
|
||||
return (preload_search_by_name(file));
|
||||
}
|
||||
|
||||
struct _buf *
|
||||
kobj_open_file(const char *file)
|
||||
{
|
||||
struct _buf *out;
|
||||
|
||||
out = kmem_alloc(sizeof(*out), KM_SLEEP);
|
||||
out->mounted = root_mounted();
|
||||
/*
|
||||
* If root is already mounted we read file using file system,
|
||||
* if not, we use loader.
|
||||
*/
|
||||
if (out->mounted)
|
||||
out->ptr = kobj_open_file_vnode(file);
|
||||
else
|
||||
out->ptr = kobj_open_file_loader(file);
|
||||
if (out->ptr == NULL) {
|
||||
kmem_free(out, sizeof(*out));
|
||||
return ((struct _buf *)-1);
|
||||
}
|
||||
return (out);
|
||||
}
|
||||
|
||||
static int
|
||||
kobj_get_filesize_vnode(struct _buf *file, uint64_t *size)
|
||||
{
|
||||
struct vnode *vp = file->ptr;
|
||||
struct thread *td = curthread;
|
||||
struct vattr va;
|
||||
int error;
|
||||
@ -101,10 +131,32 @@ kobj_get_filesize(struct _buf *file, uint64_t *size)
|
||||
return (error);
|
||||
}
|
||||
|
||||
int
|
||||
kobj_read_file(struct _buf *file, char *buf, unsigned size, unsigned off)
|
||||
static int
|
||||
kobj_get_filesize_loader(struct _buf *file, uint64_t *size)
|
||||
{
|
||||
struct vnode *vp = (struct vnode *)file;
|
||||
void *ptr;
|
||||
|
||||
ptr = preload_search_info(file->ptr, MODINFO_SIZE);
|
||||
if (ptr == NULL)
|
||||
return (ENOENT);
|
||||
*size = (uint64_t)*(size_t *)ptr;
|
||||
return (0);
|
||||
}
|
||||
|
||||
int
|
||||
kobj_get_filesize(struct _buf *file, uint64_t *size)
|
||||
{
|
||||
|
||||
if (file->mounted)
|
||||
return (kobj_get_filesize_vnode(file, size));
|
||||
else
|
||||
return (kobj_get_filesize_loader(file, size));
|
||||
}
|
||||
|
||||
int
|
||||
kobj_read_file_vnode(struct _buf *file, char *buf, unsigned size, unsigned off)
|
||||
{
|
||||
struct vnode *vp = file->ptr;
|
||||
struct thread *td = curthread;
|
||||
struct uio auio;
|
||||
struct iovec aiov;
|
||||
@ -130,13 +182,39 @@ kobj_read_file(struct _buf *file, char *buf, unsigned size, unsigned off)
|
||||
return (error != 0 ? -1 : size - auio.uio_resid);
|
||||
}
|
||||
|
||||
int
|
||||
kobj_read_file_loader(struct _buf *file, char *buf, unsigned size, unsigned off)
|
||||
{
|
||||
char *ptr;
|
||||
|
||||
ptr = preload_search_info(file->ptr, MODINFO_ADDR);
|
||||
if (ptr == NULL)
|
||||
return (ENOENT);
|
||||
ptr = *(void **)ptr;
|
||||
bcopy(ptr + off, buf, size);
|
||||
return (0);
|
||||
}
|
||||
|
||||
int
|
||||
kobj_read_file(struct _buf *file, char *buf, unsigned size, unsigned off)
|
||||
{
|
||||
|
||||
if (file->mounted)
|
||||
return (kobj_read_file_vnode(file, buf, size, off));
|
||||
else
|
||||
return (kobj_read_file_loader(file, buf, size, off));
|
||||
}
|
||||
|
||||
void
|
||||
kobj_close_file(struct _buf *file)
|
||||
{
|
||||
struct vnode *vp = (struct vnode *)file;
|
||||
struct thread *td = curthread;
|
||||
int flags;
|
||||
|
||||
flags = FREAD;
|
||||
vn_close(vp, flags, td->td_ucred, td);
|
||||
if (file->mounted) {
|
||||
struct vnode *vp = file->ptr;
|
||||
struct thread *td = curthread;
|
||||
int flags = FREAD;
|
||||
|
||||
vn_close(vp, flags, td->td_ucred, td);
|
||||
}
|
||||
kmem_free(file, sizeof(*file));
|
||||
}
|
||||
|
@ -31,6 +31,13 @@
|
||||
|
||||
#include <sys/types.h>
|
||||
#include <sys/kmem.h>
|
||||
#include_next <sys/kobj.h>
|
||||
#ifdef AT_UID
|
||||
#undef AT_UID
|
||||
#endif
|
||||
#ifdef AT_GID
|
||||
#undef AT_GID
|
||||
#endif
|
||||
#include <sys/vnode.h>
|
||||
|
||||
#define KM_NOWAIT 0x01
|
||||
@ -41,7 +48,8 @@ void *kobj_alloc(size_t size, int flag);
|
||||
void *kobj_zalloc(size_t size, int flag);
|
||||
|
||||
struct _buf {
|
||||
void *dummy;
|
||||
void *ptr;
|
||||
int mounted;
|
||||
};
|
||||
|
||||
struct _buf *kobj_open_file(const char *path);
|
||||
|
Loading…
Reference in New Issue
Block a user