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Preparation for a "chroot"-like feature. 

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@15224 27425a3e-05d8-49a3-a47f-9c15f0e5edd8
This commit is contained in:
Giovanni Di Sirio 2021-12-09 13:40:01 +00:00
parent 613dec7ec7
commit cf97561662
1 changed files with 55 additions and 14 deletions
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69
os/vfs/drivers/overlay/drvoverlay.c
View File

@ -117,6 +117,17 @@ static msg_t match_driver(vfs_overlay_driver_c *odp,
return err;
}
/* TODO */
static msg_t build_path(vfs_overlay_driver_c *drvp,
const char *path,
char *buf) {
(void) drvp;
strcpy(buf, path);
return VFS_RET_SUCCESS;
}
static msg_t drv_open_dir(void *instance,
const char *path,
vfs_directory_node_c **vdnpp) {
@ -125,9 +136,11 @@ static msg_t drv_open_dir(void *instance,
msg_t err;
do {
/* Expecting an absolute path.*/
err = vfs_parse_match_separator(&scanpath);
VFS_BREAK_ON_ERROR(err);
/* If it is the root.*/
if (*scanpath == '\0') {
/* Creating a root directory node.*/
@ -152,7 +165,7 @@ static msg_t drv_open_dir(void *instance,
return VFS_RET_SUCCESS;
}
}
else {
else { /* Not the root.*/
vfs_driver_c *dp;
/* Searching for a match among registered overlays.*/
@ -164,12 +177,26 @@ static msg_t drv_open_dir(void *instance,
vdnpp);
}
else {
/* No matching overlay, the whole path is passed to the overlaid
driver, if defined, else returning the previous error.*/
/* Is there an overlaid driver? if so we need to pass request
processing there.*/
if (drvp->overlaid_drv != NULL) {
err = drvp->overlaid_drv->vmt->open_dir((void *)drvp->overlaid_drv,
path,
vdnpp);
char *buf;
/* Taking a path buffer from the pool.*/
buf = vfs_buffer_take();
/* Building the final path for the overlaid driver.*/
err = build_path(drvp, path, buf);
/* Passing the combined path to the overlaid driver.*/
if (err == VFS_RET_SUCCESS) {
err = drvp->overlaid_drv->vmt->open_dir((void *)drvp->overlaid_drv,
buf,
vdnpp);
}
/* Buffer returned.*/
vfs_buffer_release(buf);
}
}
}
@ -188,13 +215,14 @@ static msg_t drv_open_file(void *instance,
msg_t err;
do {
/* Expecting an absolute path.*/
err = vfs_parse_match_separator(&scanpath);
VFS_BREAK_ON_ERROR(err);
if (*scanpath == '\0') {
(void)instance;
/* Always not found, there are no files in the root.*/
/* Always not found, root is not a file.*/
err = VFS_RET_ENOENT;
}
else {
@ -207,16 +235,29 @@ static msg_t drv_open_file(void *instance,
err = dp->vmt->open_file((void *)dp, scanpath, oflag, vfnpp);
}
else {
/* No matching overlay, the whole path is passed to the overlaid
driver, if defined, else returning the previous error.*/
/* Is there an overlaid driver? if so we need to pass request
processing there.*/
if (drvp->overlaid_drv != NULL) {
err = drvp->overlaid_drv->vmt->open_file((void *)drvp->overlaid_drv,
path,
oflag,
vfnpp);
char *buf;
/* Taking a path buffer from the pool.*/
buf = vfs_buffer_take();
/* Building the final path for the overlaid driver.*/
err = build_path(drvp, path, buf);
/* Passing the combined path to the overlaid driver.*/
if (err == VFS_RET_SUCCESS) {
err = drvp->overlaid_drv->vmt->open_file((void *)drvp->overlaid_drv,
path,
oflag,
vfnpp);
}
/* Buffer returned.*/
vfs_buffer_release(buf);
}
}
}
}
while (false);