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extmod/vfs: Expose mp_vfs_mount_t type. 

It should only be used for low-level things and with caution, for example
putting mounted VFS data in ROM or the static data section.
This commit is contained in:
Damien George 2017-01-27 22:40:15 +11:00
parent f488fa29e4
commit 3f6b4e08e3
3 changed files with 31 additions and 31 deletions
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51
extmod/vfs.c
View File

@ -36,21 +36,14 @@
#if MICROPY_VFS
// ROOT is 0 so that the default current directory is the root directory
#define VFS_NONE ((vfs_mount_t*)1)
#define VFS_ROOT ((vfs_mount_t*)0)
typedef struct _vfs_mount_t {
const char *str; // mount point with leading /
size_t len;
mp_obj_t obj;
struct _vfs_mount_t *next;
} vfs_mount_t;
#define VFS_NONE ((mp_vfs_mount_t*)1)
#define VFS_ROOT ((mp_vfs_mount_t*)0)
// path is the path to lookup and *path_out holds the path within the VFS
// object (starts with / if an absolute path).
// Returns VFS_ROOT for root dir (and then path_out is undefined) and VFS_NONE
// for path not found.
STATIC vfs_mount_t *lookup_path_raw(const char *path, const char **path_out) {
STATIC mp_vfs_mount_t *lookup_path_raw(const char *path, const char **path_out) {
if (path[0] == '/' && path[1] == 0) {
return VFS_ROOT;
} else if (MP_STATE_VM(vfs_cur) == VFS_ROOT) {
@ -64,7 +57,7 @@ STATIC vfs_mount_t *lookup_path_raw(const char *path, const char **path_out) {
return MP_STATE_VM(vfs_cur);
}
for (vfs_mount_t *vfs = MP_STATE_VM(vfs_mount_table); vfs != NULL; vfs = vfs->next) {
for (mp_vfs_mount_t *vfs = MP_STATE_VM(vfs_mount_table); vfs != NULL; vfs = vfs->next) {
if (strncmp(path, vfs->str, vfs->len) == 0) {
if (path[vfs->len] == '/') {
*path_out = path + vfs->len;
@ -81,10 +74,10 @@ STATIC vfs_mount_t *lookup_path_raw(const char *path, const char **path_out) {
}
// Version of lookup_path_raw that takes and returns uPy string objects.
STATIC vfs_mount_t *lookup_path(mp_obj_t path_in, mp_obj_t *path_out) {
STATIC mp_vfs_mount_t *lookup_path(mp_obj_t path_in, mp_obj_t *path_out) {
const char *path = mp_obj_str_get_str(path_in);
const char *p_out;
vfs_mount_t *vfs = lookup_path_raw(path, &p_out);
mp_vfs_mount_t *vfs = lookup_path_raw(path, &p_out);
if (vfs != VFS_NONE && vfs != VFS_ROOT) {
*path_out = mp_obj_new_str_of_type(mp_obj_get_type(path_in),
(const byte*)p_out, strlen(p_out));
@ -92,7 +85,7 @@ STATIC vfs_mount_t *lookup_path(mp_obj_t path_in, mp_obj_t *path_out) {
return vfs;
}
STATIC mp_obj_t mp_vfs_proxy_call(vfs_mount_t *vfs, qstr meth_name, size_t n_args, const mp_obj_t *args) {
STATIC mp_obj_t mp_vfs_proxy_call(mp_vfs_mount_t *vfs, qstr meth_name, size_t n_args, const mp_obj_t *args) {
if (vfs == VFS_NONE) {
// mount point not found
mp_raise_OSError(MP_ENODEV);
@ -111,7 +104,7 @@ STATIC mp_obj_t mp_vfs_proxy_call(vfs_mount_t *vfs, qstr meth_name, size_t n_arg
mp_import_stat_t mp_vfs_import_stat(const char *path) {
const char *path_out;
vfs_mount_t *vfs = lookup_path_raw(path, &path_out);
mp_vfs_mount_t *vfs = lookup_path_raw(path, &path_out);
if (vfs == VFS_NONE || vfs == VFS_ROOT) {
return MP_IMPORT_STAT_NO_EXIST;
}
@ -141,7 +134,7 @@ mp_obj_t mp_vfs_mount(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args
const char *mnt_str = mp_obj_str_get_data(pos_args[1], &mnt_len);
// create new object
vfs_mount_t *vfs = m_new_obj(vfs_mount_t);
mp_vfs_mount_t *vfs = m_new_obj(mp_vfs_mount_t);
vfs->str = mnt_str;
vfs->len = mnt_len;
vfs->obj = pos_args[0];
@ -157,7 +150,7 @@ mp_obj_t mp_vfs_mount(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args
}
// insert the vfs into the mount table
vfs_mount_t **vfsp = &MP_STATE_VM(vfs_mount_table);
mp_vfs_mount_t **vfsp = &MP_STATE_VM(vfs_mount_table);
while (*vfsp != NULL) {
vfsp = &(*vfsp)->next;
}
@ -169,13 +162,13 @@ MP_DEFINE_CONST_FUN_OBJ_KW(mp_vfs_mount_obj, 2, mp_vfs_mount);
mp_obj_t mp_vfs_umount(mp_obj_t mnt_in) {
// remove vfs from the mount table
vfs_mount_t *vfs = NULL;
mp_vfs_mount_t *vfs = NULL;
mp_uint_t mnt_len;
const char *mnt_str = NULL;
if (MP_OBJ_IS_STR(mnt_in)) {
mnt_str = mp_obj_str_get_data(mnt_in, &mnt_len);
}
for (vfs_mount_t **vfsp = &MP_STATE_VM(vfs_mount_table); *vfsp != NULL; vfsp = &(*vfsp)->next) {
for (mp_vfs_mount_t **vfsp = &MP_STATE_VM(vfs_mount_table); *vfsp != NULL; vfsp = &(*vfsp)->next) {
if ((mnt_str != NULL && !memcmp(mnt_str, (*vfsp)->str, mnt_len + 1)) || (*vfsp)->obj == mnt_in) {
vfs = *vfsp;
*vfsp = (*vfsp)->next;
@ -210,14 +203,14 @@ mp_obj_t mp_vfs_open(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args)
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
vfs_mount_t *vfs = lookup_path((mp_obj_t)args[ARG_file].u_rom_obj, &args[ARG_file].u_obj);
mp_vfs_mount_t *vfs = lookup_path((mp_obj_t)args[ARG_file].u_rom_obj, &args[ARG_file].u_obj);
return mp_vfs_proxy_call(vfs, MP_QSTR_open, 2, (mp_obj_t*)&args);
}
MP_DEFINE_CONST_FUN_OBJ_KW(mp_vfs_open_obj, 0, mp_vfs_open);
mp_obj_t mp_vfs_chdir(mp_obj_t path_in) {
mp_obj_t path_out;
vfs_mount_t *vfs = lookup_path(path_in, &path_out);
mp_vfs_mount_t *vfs = lookup_path(path_in, &path_out);
if (vfs != VFS_ROOT) {
mp_vfs_proxy_call(vfs, MP_QSTR_chdir, 1, &path_out);
}
@ -251,7 +244,7 @@ mp_obj_t mp_vfs_listdir(size_t n_args, const mp_obj_t *args) {
}
mp_obj_t path_out;
vfs_mount_t *vfs = lookup_path(path_in, &path_out);
mp_vfs_mount_t *vfs = lookup_path(path_in, &path_out);
if (vfs == VFS_ROOT) {
// list the root directory
@ -269,22 +262,22 @@ MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_vfs_listdir_obj, 0, 1, mp_vfs_listdir);
mp_obj_t mp_vfs_mkdir(mp_obj_t path_in) {
mp_obj_t path_out;
vfs_mount_t *vfs = lookup_path(path_in, &path_out);
mp_vfs_mount_t *vfs = lookup_path(path_in, &path_out);
return mp_vfs_proxy_call(vfs, MP_QSTR_mkdir, 1, &path_out);
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_vfs_mkdir_obj, mp_vfs_mkdir);
mp_obj_t mp_vfs_remove(mp_obj_t path_in) {
mp_obj_t path_out;
vfs_mount_t *vfs = lookup_path(path_in, &path_out);
mp_vfs_mount_t *vfs = lookup_path(path_in, &path_out);
return mp_vfs_proxy_call(vfs, MP_QSTR_remove, 1, &path_out);
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_vfs_remove_obj, mp_vfs_remove);
mp_obj_t mp_vfs_rename(mp_obj_t old_path_in, mp_obj_t new_path_in) {
mp_obj_t args[2];
vfs_mount_t *old_vfs = lookup_path(old_path_in, &args[0]);
vfs_mount_t *new_vfs = lookup_path(new_path_in, &args[1]);
mp_vfs_mount_t *old_vfs = lookup_path(old_path_in, &args[0]);
mp_vfs_mount_t *new_vfs = lookup_path(new_path_in, &args[1]);
if (old_vfs != new_vfs) {
// can't rename across filesystems
mp_raise_OSError(MP_EPERM);
@ -295,21 +288,21 @@ MP_DEFINE_CONST_FUN_OBJ_2(mp_vfs_rename_obj, mp_vfs_rename);
mp_obj_t mp_vfs_rmdir(mp_obj_t path_in) {
mp_obj_t path_out;
vfs_mount_t *vfs = lookup_path(path_in, &path_out);
mp_vfs_mount_t *vfs = lookup_path(path_in, &path_out);
return mp_vfs_proxy_call(vfs, MP_QSTR_rmdir, 1, &path_out);
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_vfs_rmdir_obj, mp_vfs_rmdir);
mp_obj_t mp_vfs_stat(mp_obj_t path_in) {
mp_obj_t path_out;
vfs_mount_t *vfs = lookup_path(path_in, &path_out);
mp_vfs_mount_t *vfs = lookup_path(path_in, &path_out);
return mp_vfs_proxy_call(vfs, MP_QSTR_stat, 1, &path_out);
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_vfs_stat_obj, mp_vfs_stat);
mp_obj_t mp_vfs_statvfs(mp_obj_t path_in) {
mp_obj_t path_out;
vfs_mount_t *vfs = lookup_path(path_in, &path_out);
mp_vfs_mount_t *vfs = lookup_path(path_in, &path_out);
return mp_vfs_proxy_call(vfs, MP_QSTR_statvfs, 1, &path_out);
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_vfs_statvfs_obj, mp_vfs_statvfs);

7
extmod/vfs.h
View File

@ -30,6 +30,13 @@
#include "py/lexer.h"
#include "py/obj.h"
typedef struct _mp_vfs_mount_t {
const char *str; // mount point with leading /
size_t len;
mp_obj_t obj;
struct _mp_vfs_mount_t *next;
} mp_vfs_mount_t;
mp_import_stat_t mp_vfs_import_stat(const char *path);
mp_obj_t mp_vfs_mount(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args);
mp_obj_t mp_vfs_umount(mp_obj_t mnt_in);

4
py/mpstate.h
View File

@ -166,8 +166,8 @@ typedef struct _mp_state_vm_t {
#endif
#if MICROPY_VFS
struct _vfs_mount_t *vfs_cur;
struct _vfs_mount_t *vfs_mount_table;
struct _mp_vfs_mount_t *vfs_cur;
struct _mp_vfs_mount_t *vfs_mount_table;
#endif
//