syscalls: statvfs

2026-10-27 12:48:22 +00:00 · 2026-03-20 21:28:59 -03:00
parent d0bb48c162
commit f8694029ab
6 changed files with 212 additions and 5 deletions
@@ -0,0 +1,133 @@
+#include <kernel/syscalls.h>
+#include <kernel/abi.h>
+#include <kernel/vfs.h>
+#include <arch/cpu.h>
+#include <errno.h>
+#include <kernel/file.h>
+#include <kernel/alloc.h>
+
+typedef uint64_t fsblkcnt_t;
+typedef uint64_t fsfilcnt_t;
+
+typedef struct {
+	unsigned long f_bsize;
+	unsigned long f_frsize;
+	fsblkcnt_t f_blocks;
+	fsblkcnt_t f_bfree;
+	fsblkcnt_t f_bavail;
+
+	fsfilcnt_t f_files;
+	fsfilcnt_t f_ffree;
+	fsfilcnt_t f_favail;
+
+	unsigned long f_fsid;
+	unsigned long f_flag;
+	unsigned long f_namemax;
+} statvfs_t;
+
+syscallret_t syscall_fstatvfs(context_t *ctx, int fd, statvfs_t *ustatvfs) {
+	syscallret_t ret = {
+		.ret = -1
+	};
+
+	file_t *file = fd_get(fd);
+	if (file == NULL) {
+		ret.errno = EBADF;
+		return ret;
+	}
+
+	fsattr_t buf;
+	ret.errno = VFS_STATFS(file->vnode->vfs, &buf);
+	if (ret.errno)
+		goto cleanup;
+
+	statvfs_t output = {
+		.f_bsize = buf.io_size,
+		.f_frsize = buf.block_size,
+		.f_blocks = buf.block_count,
+		.f_bfree = buf.free_blocks,
+		.f_bavail = buf.free_blocks_unprivileged,
+		.f_files = buf.inode_count,
+		.f_ffree = buf.free_inode_count,
+		.f_favail = buf.free_inode_count_unprivileged,
+		.f_fsid = buf.fsid,
+		.f_flag = buf.flags,
+		.f_namemax = buf.max_name_size
+	};
+
+	ret.errno = usercopy_touser(ustatvfs, &output, sizeof(statvfs_t));
+	ret.ret = ret.errno ? -1 : 0;
+
+	cleanup:
+	fd_release(file);
+	return ret;
+}
+
+syscallret_t syscall_fstatvfsat(context_t *ctx, int dirfd, char *upath, stat_t *ustatvfs, int flags) {
+	syscallret_t ret = {
+		.ret = -1
+	};
+
+	size_t pathlen;
+	ret.errno = usercopy_strlen(upath, &pathlen);
+	if (ret.errno)
+		return ret;
+
+	char *path = alloc(pathlen + 1);
+	if (path == NULL) {
+		ret.errno = ENOMEM;
+		return ret;
+	}
+
+	ret.errno = usercopy_fromuser(path, upath, pathlen);
+	if (ret.errno) {
+		free(path);
+		return ret;
+	}
+
+	vnode_t *dirnode = NULL;
+	file_t *file = NULL;
+	ret.errno = dirfd_enter(path, dirfd, &file, &dirnode);
+	if (ret.errno)
+		goto cleanup;
+
+	vnode_t *node = NULL;
+	ret.errno = vfs_lookup(&node, dirnode, path, NULL, flags & AT_SYMLINK_NOFOLLOW ? VFS_LOOKUP_NOLINK : 0);
+	if (ret.errno)
+		goto cleanup;
+	// locked by vfs_lookup
+	VOP_UNLOCK(node);
+
+	fsattr_t buf;
+	ret.errno = VFS_STATFS(node->vfs, &buf);
+	if (ret.errno)
+		goto cleanup;
+
+	statvfs_t output = {
+		.f_bsize = buf.io_size,
+		.f_frsize = buf.block_size,
+		.f_blocks = buf.block_count,
+		.f_bfree = buf.free_blocks,
+		.f_bavail = buf.free_blocks_unprivileged,
+		.f_files = buf.inode_count,
+		.f_ffree = buf.free_inode_count,
+		.f_favail = buf.free_inode_count_unprivileged,
+		.f_fsid = buf.fsid,
+		.f_flag = buf.flags,
+		.f_namemax = buf.max_name_size
+	};
+
+	ret.errno = usercopy_touser(ustatvfs, &output, sizeof(statvfs_t));
+	ret.ret = ret.errno ? -1 : 0;
+
+	cleanup:
+	if (node)
+		VOP_RELEASE(node);
+
+	if (dirnode)
+		dirfd_leave(dirnode, file);
+
+	free(path);
+
+	return ret;
+}