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Implement VFS syscalls
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This commit is contained in:
Kamil Kowalczyk
2026-02-15 21:34:07 +01:00
parent 0f5bd48328
commit 7726fd2f00
19 changed files with 307 additions and 31 deletions
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78
kernel/fs/vfs.c
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@@ -7,6 +7,7 @@
#include <libk/string.h>
#include <m/status.h>
#include <mm/liballoc.h>
#include <proc/procgroup.h>
#include <sync/spin_lock.h>
#include <sys/debug.h>
@@ -75,7 +76,9 @@ struct vfs_mountpoint* vfs_create_mountpoint (const char* key, int fs_type) {
return mountpoint;
}
int vfs_describe (const char* mountpoint, const char* path, struct fs_desc_buffer* desc) {
int vfs_open (struct procgroup* procgroup, const char* mountpoint, const char* path) {
(void)path;
struct vfs_mountpoint* vmp = vfs_find_mountpoint (mountpoint);
if (vmp == NULL)
@@ -83,6 +86,51 @@ int vfs_describe (const char* mountpoint, const char* path, struct fs_desc_buffe
spin_lock (&vmp->lock);
vmp->ownerpg = procgroup;
vmp->locked = true;
spin_unlock (&vmp->lock);
return ST_OK;
}
int vfs_close (struct procgroup* procgroup, const char* mountpoint, const char* path) {
(void)path;
struct vfs_mountpoint* vmp = vfs_find_mountpoint (mountpoint);
if (vmp == NULL)
return -ST_NOT_FOUND;
spin_lock (&vmp->lock);
if (procgroup != NULL && vmp->ownerpg != procgroup) {
spin_unlock (&vmp->lock);
return -ST_PERMISSION_ERROR;
}
vmp->locked = false;
vmp->ownerpg = NULL;
spin_unlock (&vmp->lock);
return ST_OK;
}
int vfs_describe (struct procgroup* procgroup, const char* mountpoint, const char* path,
struct fs_desc_buffer* desc) {
struct vfs_mountpoint* vmp = vfs_find_mountpoint (mountpoint);
if (vmp == NULL)
return -ST_NOT_FOUND;
spin_lock (&vmp->lock);
if ((procgroup != NULL && vmp->ownerpg != procgroup) && vmp->locked) {
spin_unlock (&vmp->lock);
return -ST_PERMISSION_ERROR;
}
int ret = vmp->driver_ops.describe (vmp, path, desc);
spin_unlock (&vmp->lock);
@@ -90,7 +138,8 @@ int vfs_describe (const char* mountpoint, const char* path, struct fs_desc_buffe
return ret;
}
int vfs_read (const char* mountpoint, const char* path, uint8_t* buffer, size_t off, size_t size) {
int vfs_read (struct procgroup* procgroup, const char* mountpoint, const char* path,
uint8_t* buffer, size_t off, size_t size) {
struct vfs_mountpoint* vmp = vfs_find_mountpoint (mountpoint);
if (vmp == NULL)
@@ -98,6 +147,11 @@ int vfs_read (const char* mountpoint, const char* path, uint8_t* buffer, size_t
spin_lock (&vmp->lock);
if ((procgroup != NULL && vmp->ownerpg != procgroup) && vmp->locked) {
spin_unlock (&vmp->lock);
return -ST_PERMISSION_ERROR;
}
int ret = vmp->driver_ops.read (vmp, path, buffer, off, size);
spin_unlock (&vmp->lock);
@@ -105,6 +159,26 @@ int vfs_read (const char* mountpoint, const char* path, uint8_t* buffer, size_t
return ret;
}
void vfs_procgroup_cleanup (struct procgroup* procgroup) {
spin_lock (&mount_table.lock);
for (size_t i = 0; i < lengthof (mount_table.mountpoint_buckets); i++) {
struct hash_node_link* link = mount_table.mountpoint_buckets[i];
struct vfs_mountpoint* vmp = hash_entry (link, struct vfs_mountpoint, mount_table_link);
spin_lock (&vmp->lock);
if (vmp->ownerpg == procgroup) {
vmp->locked = false;
vmp->ownerpg = NULL;
}
spin_unlock (&vmp->lock);
}
spin_unlock (&mount_table.lock);
}
void vfs_init (void) {
memset (&mount_table, 0, sizeof (mount_table));