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mirror of https://git.FreeBSD.org/src.git synced 2024-12-20 11:11:24 +00:00

Add a few convenient functions in the mount_arg() family and collect the

entire family at the end of the source file.
This commit is contained in:
Poul-Henning Kamp 2004-12-06 13:01:41 +00:00
parent 5cb0b08e40
commit 49bfeeb848
Notes: svn2git 2020-12-20 02:59:44 +00:00
svn path=/head/; revision=138448
2 changed files with 211 additions and 72 deletions

View File

@ -377,76 +377,6 @@ nmount(td, uap)
return (error); return (error);
} }
struct mntarg {
struct iovec *v;
int len;
};
struct mntarg *
mount_arg(struct mntarg *ma, const char *name, const void *val, int len)
{
if (ma == NULL)
ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
M_MOUNT, M_WAITOK);
ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
ma->v[ma->len].iov_len = strlen(name) + 1;
ma->len++;
ma->v[ma->len].iov_base = (void *)(uintptr_t)val;
if (len < 0)
ma->v[ma->len].iov_len = strlen(val) + 1;
else
ma->v[ma->len].iov_len = len;
ma->len++;
return (ma);
}
int
kernel_mount(struct mntarg *ma, int flags)
{
struct uio auio;
int error;
KASSERT(ma != NULL, ("kernel_mount NULL ma"));
KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v"));
KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len));
auio.uio_iov = ma->v;
auio.uio_iovcnt = ma->len;
auio.uio_segflg = UIO_SYSSPACE;
error = vfs_donmount(curthread, flags, &auio);
free(ma->v, M_MOUNT);
free(ma, M_MOUNT);
return (error);
}
int
kernel_vmount(int flags, ...)
{
struct mntarg *ma = NULL;
va_list ap;
const char *cp;
const void *vp;
int error;
va_start(ap, flags);
for (;;) {
cp = va_arg(ap, const char *);
if (cp == NULL)
break;
vp = va_arg(ap, const void *);
ma = mount_arg(ma, cp, vp, -1);
}
va_end(ap);
error = kernel_mount(ma, flags);
return (error);
}
/* /*
* Allocate and initialize the mount point struct. * Allocate and initialize the mount point struct.
*/ */
@ -1543,3 +1473,207 @@ __vfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
memcpy(sbp, &mp->mnt_stat, sizeof sbp); memcpy(sbp, &mp->mnt_stat, sizeof sbp);
return (error); return (error);
} }
/*
* ---------------------------------------------------------------------
* This is the api for building mount args and mounting filesystems from
* inside the kernel.
*
* The API works by accumulation of individual args. First error is
* latched.
*
* XXX: should be documented in new manpage kernel_mount(9)
*/
/* A memory allocation which must be freed when we are done */
struct mntaarg {
SLIST_ENTRY(mntaarg) next;
};
/* The header for the mount arguments */
struct mntarg {
struct iovec *v;
int len;
int error;
SLIST_HEAD(, mntaarg) list;
};
/*
* Add a boolean argument.
*
* flag is the boolean value.
* name must start with "no".
*/
struct mntarg *
mount_argb(struct mntarg *ma, int flag, const char *name)
{
KASSERT(name[0] == 'n' && name[1] == 'o',
("mount_argb(...,%s): name must start with 'no'", name));
return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0));
}
/*
* Add an argument printf style
*/
struct mntarg *
mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...)
{
va_list ap;
struct mntaarg *maa;
struct sbuf *sb;
int len;
if (ma == NULL) {
ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
SLIST_INIT(&ma->list);
}
if (ma->error)
return (ma);
ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
M_MOUNT, M_WAITOK);
ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
ma->v[ma->len].iov_len = strlen(name) + 1;
ma->len++;
sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
va_start(ap, fmt);
sbuf_vprintf(sb, fmt, ap);
va_end(ap);
sbuf_finish(sb);
len = sbuf_len(sb) + 1;
maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
SLIST_INSERT_HEAD(&ma->list, maa, next);
bcopy(sbuf_data(sb), maa + 1, len);
sbuf_delete(sb);
ma->v[ma->len].iov_base = maa + 1;
ma->v[ma->len].iov_len = len;
ma->len++;
return (ma);
}
/*
* Add an argument which is a userland string.
*/
struct mntarg *
mount_argsu(struct mntarg *ma, const char *name, const void *val, int len)
{
struct mntaarg *maa;
char *tbuf;
if (val == NULL)
return (ma);
if (ma == NULL) {
ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
SLIST_INIT(&ma->list);
}
if (ma->error)
return (ma);
maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
SLIST_INSERT_HEAD(&ma->list, maa, next);
tbuf = (void *)(maa + 1);
ma->error = copyinstr(val, tbuf, len, NULL);
return (mount_arg(ma, name, tbuf, -1));
}
/*
* Plain argument.
*
* If length is -1, use printf.
*/
struct mntarg *
mount_arg(struct mntarg *ma, const char *name, const void *val, int len)
{
if (ma == NULL) {
ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
SLIST_INIT(&ma->list);
}
if (ma->error)
return (ma);
ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
M_MOUNT, M_WAITOK);
ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
ma->v[ma->len].iov_len = strlen(name) + 1;
ma->len++;
ma->v[ma->len].iov_base = (void *)(uintptr_t)val;
if (len < 0)
ma->v[ma->len].iov_len = strlen(val) + 1;
else
ma->v[ma->len].iov_len = len;
ma->len++;
return (ma);
}
/*
* Free a mntarg structure
*/
void
free_mntarg(struct mntarg *ma)
{
struct mntaarg *maa;
while (!SLIST_EMPTY(&ma->list)) {
maa = SLIST_FIRST(&ma->list);
SLIST_REMOVE_HEAD(&ma->list, next);
free(maa, M_MOUNT);
}
free(ma->v, M_MOUNT);
free(ma, M_MOUNT);
}
/*
* Mount a filesystem
*/
int
kernel_mount(struct mntarg *ma, int flags)
{
struct uio auio;
int error;
KASSERT(ma != NULL, ("kernel_mount NULL ma"));
KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v"));
KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len));
auio.uio_iov = ma->v;
auio.uio_iovcnt = ma->len;
auio.uio_segflg = UIO_SYSSPACE;
error = ma->error;
if (!error)
error = vfs_donmount(curthread, flags, &auio);
free_mntarg(ma);
return (error);
}
/*
* A printflike function to mount a filesystem.
*/
int
kernel_vmount(int flags, ...)
{
struct mntarg *ma = NULL;
va_list ap;
const char *cp;
const void *vp;
int error;
va_start(ap, flags);
for (;;) {
cp = va_arg(ap, const char *);
if (cp == NULL)
break;
vp = va_arg(ap, const void *);
ma = mount_arg(ma, cp, vp, -1);
}
va_end(ap);
error = kernel_mount(ma, flags);
return (error);
}

View File

@ -459,6 +459,7 @@ extern struct vfsconfhead vfsconf;
struct mount_args; struct mount_args;
struct nameidata; struct nameidata;
struct sysctl_req; struct sysctl_req;
struct mntarg;
typedef int vfs_cmount_t(char *path, void *data, int flags, struct thread *td); typedef int vfs_cmount_t(char *path, void *data, int flags, struct thread *td);
typedef int vfs_omount_t(struct mount *mp, char *path, caddr_t data, typedef int vfs_omount_t(struct mount *mp, char *path, caddr_t data,
@ -559,10 +560,14 @@ extern char *mountrootfsname;
* exported vnode operations * exported vnode operations
*/ */
int dounmount(struct mount *, int, struct thread *); int dounmount(struct mount *, int, struct thread *);
struct mntarg;
struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len); void free_mntarg(struct mntarg *ma);
struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name);
int kernel_mount(struct mntarg *ma, int flags); int kernel_mount(struct mntarg *ma, int flags);
int kernel_vmount(int flags, ...); int kernel_vmount(int flags, ...);
struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len);
struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...);
struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len);
struct vfsconf *vfs_byname(const char *); struct vfsconf *vfs_byname(const char *);
struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *); struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *);
void vfs_event_signal(fsid_t *, u_int32_t, intptr_t); void vfs_event_signal(fsid_t *, u_int32_t, intptr_t);