vfs.cpp File Reference

#include "mos/assert.hpp"
#include "mos/device/timer.hpp"
#include "mos/filesystem/inode.hpp"
#include "mos/filesystem/mount.hpp"
#include "mos/filesystem/page_cache.hpp"
#include "mos/filesystem/sysfs/sysfs.hpp"
#include "mos/filesystem/sysfs/sysfs_autoinit.hpp"
#include "mos/mm/mm.hpp"
#include "mos/mm/mmstat.hpp"
#include <algorithm>
#include <dirent.h>
#include <errno.h>
#include <mos/filesystem/dentry.hpp>
#include <mos/filesystem/fs_types.h>
#include <mos/filesystem/vfs.hpp>
#include <mos/filesystem/vfs_types.hpp>
#include <mos/io/io.hpp>
#include <mos/lib/structures/list.hpp>
#include <mos/lib/structures/tree.hpp>
#include <mos/lib/sync/spinlock.hpp>
#include <mos/mos_global.h>
#include <mos/platform/platform.hpp>
#include <mos/syslog/printk.hpp>
#include <mos/tasks/process.hpp>
#include <mos/types.hpp>
#include <mos_stdlib.hpp>
#include <mos_string.hpp>

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Functions
static long	do_pagecache_flush (file_t *file, off_t pgoff, size_t npages)
static long	do_sync_inode (file_t *file)
static void	vfs_io_ops_close (io_t *io)
static void	vfs_io_ops_close_dir (io_t *io)
static size_t	vfs_io_ops_read (io_t *io, void *buf, size_t count)
static size_t	vfs_io_ops_write (io_t *io, const void *buf, size_t count)
static off_t	vfs_io_ops_seek (io_t *io, off_t offset, io_seek_whence_t whence)
static vmfault_result_t	vfs_fault_handler (vmap_t *vmap, ptr_t fault_addr, pagefault_t *info)
static bool	vfs_io_ops_mmap (io_t *io, vmap_t *vmap, off_t offset)
static bool	vfs_io_ops_munmap (io_t *io, vmap_t *vmap, bool *unmapped)
static void	vfs_io_ops_getname (const io_t *io, char *buf, size_t size)
static __used void	vfs_flusher_entry (void *arg)
static void	vfs_flusher_init (void)
	MOS_INIT (KTHREAD, vfs_flusher_init)
static void	vfs_copy_stat (file_stat_t *statbuf, inode_t *inode)
static filesystem_t *	vfs_find_filesystem (mos::string_view name)
static bool	vfs_verify_permissions (dentry_t &file_dentry, bool open, bool read, bool create, bool execute, bool write)
static PtrResult< file_t >	vfs_do_open (dentry_t *base, const char *path, open_flags flags)
PtrResult< file_t >	vfs_do_open_dentry (dentry_t *entry, bool created, bool read, bool write, bool exec, bool truncate)
	Open an directory dentry.
void	vfs_register_filesystem (filesystem_t *fs)
long	vfs_mount (const char *device, const char *path, const char *fs, const char *options)
	Mount a filesystem at a given existing path.
long	vfs_unmount (const char *path)
	Unmount a filesystem at a given path.
PtrResult< file_t >	vfs_openat (int fd, const char *path, open_flags flags)
	Open a file at a given path.
long	vfs_fstatat (fd_t fd, const char *path, file_stat_t *__restrict statbuf, fstatat_flags flags)
	Stat a file.
size_t	vfs_readlinkat (fd_t dirfd, const char *path, char *buf, size_t size)
	Read a symbolic link.
long	vfs_symlink (const char *path, const char *target)
	Create a symbolic link.
long	vfs_mkdir (const char *path)
	Create a directory.
long	vfs_rmdir (const char *path)
size_t	vfs_list_dir (io_t *io, void *user_buf, size_t user_size)
	Get the content of a directory.
long	vfs_chdirat (fd_t dirfd, const char *path)
	Change the current working directory.
ssize_t	vfs_getcwd (char *buf, size_t size)
	Get the current working directory.
long	vfs_fchmodat (fd_t fd, const char *path, int perm, int flags)
	Change the permissions of a file.
long	vfs_unlinkat (fd_t dirfd, const char *path)
	Remove the name of a file, and possibly the file itself.
long	vfs_fsync (io_t *io, bool sync_metadata, off_t start, off_t end)
	Synchronize a file with the filesystem.
static bool	vfs_sysfs_filesystems (sysfs_file_t *f)
static bool	vfs_sysfs_mountpoints (sysfs_file_t *f)
static void	vfs_sysfs_dentry_stats_stat_receiver (int depth, const dentry_t *dentry, bool mountroot, void *data)
static bool	vfs_sysfs_dentry_stats (sysfs_file_t *f)
	SYSFS_AUTOREGISTER (vfs, vfs_sysfs_items)

Variables
static list_head	vfs_fs_list
static spinlock_t	vfs_fs_list_lock
dentry_t *	root_dentry = NULL
static const io_op_t	file_io_ops
static const io_op_t	dir_io_ops
static sysfs_item_t	vfs_sysfs_items []

Function Documentation

do_pagecache_flush()

static long do_pagecache_flush ( file_t * file, off_t pgoff, size_t npages )

static

Definition at line 37 of file vfs.cpp.

Referenced by vfs_fsync(), and vfs_io_ops_close().

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do_sync_inode()

static long do_sync_inode ( file_t * file )

static

Definition at line 52 of file vfs.cpp.

Referenced by vfs_fsync(), and vfs_io_ops_close().

vfs_io_ops_close()

static void vfs_io_ops_close ( io_t * io )

static

Definition at line 62 of file vfs.cpp.

Referenced by vfs_io_ops_close_dir().

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vfs_io_ops_close_dir()

static void vfs_io_ops_close_dir ( io_t * io )

static

Definition at line 86 of file vfs.cpp.

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vfs_io_ops_read()

static size_t vfs_io_ops_read ( io_t * io, void * buf, size_t count )

static

Definition at line 106 of file vfs.cpp.

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vfs_io_ops_write()

static size_t vfs_io_ops_write ( io_t * io, const void * buf, size_t count )

static

Definition at line 124 of file vfs.cpp.

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vfs_io_ops_seek()

static off_t vfs_io_ops_seek ( io_t * io, off_t offset, io_seek_whence_t whence )

static

Definition at line 139 of file vfs.cpp.

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vfs_fault_handler()

static vmfault_result_t vfs_fault_handler ( vmap_t * vmap, ptr_t fault_addr, pagefault_t * info )

static

Definition at line 178 of file vfs.cpp.

Referenced by vfs_io_ops_mmap().

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vfs_io_ops_mmap()

static bool vfs_io_ops_mmap ( io_t * io, vmap_t * vmap, off_t offset )

static

Definition at line 228 of file vfs.cpp.

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vfs_io_ops_munmap()

static bool vfs_io_ops_munmap ( io_t * io, vmap_t * vmap, bool * unmapped )

static

Definition at line 242 of file vfs.cpp.

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vfs_io_ops_getname()

static void vfs_io_ops_getname ( const io_t * io, char * buf, size_t size )

static

Definition at line 253 of file vfs.cpp.

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vfs_flusher_entry()

static __used void vfs_flusher_entry ( void * arg )

static

Definition at line 277 of file vfs.cpp.

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vfs_flusher_init()

static void vfs_flusher_init ( void )

static

Definition at line 287 of file vfs.cpp.

Referenced by MOS_INIT().

MOS_INIT()

MOS_INIT	(	KTHREAD	,
		vfs_flusher_init	)

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vfs_copy_stat()

static void vfs_copy_stat ( file_stat_t * statbuf, inode_t * inode )

static

Definition at line 293 of file vfs.cpp.

Referenced by vfs_fstatat().

vfs_find_filesystem()

static filesystem_t * vfs_find_filesystem ( mos::string_view name )

static

Definition at line 310 of file vfs.cpp.

Referenced by vfs_mount(), and vfs_register_filesystem().

vfs_verify_permissions()

static bool vfs_verify_permissions ( dentry_t & file_dentry, bool open, bool read, bool create, bool execute, bool write )

static

Definition at line 322 of file vfs.cpp.

Referenced by vfs_do_open().

vfs_do_open()

static PtrResult< file_t > vfs_do_open ( dentry_t * base, const char * path, open_flags flags )

static

Definition at line 339 of file vfs.cpp.

Referenced by vfs_openat().

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vfs_sysfs_filesystems()

static bool vfs_sysfs_filesystems ( sysfs_file_t * f )

static

Definition at line 882 of file vfs.cpp.

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vfs_sysfs_mountpoints()

static bool vfs_sysfs_mountpoints ( sysfs_file_t * f )

static

Definition at line 892 of file vfs.cpp.

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vfs_sysfs_dentry_stats_stat_receiver()

static void vfs_sysfs_dentry_stats_stat_receiver ( int depth, const dentry_t * dentry, bool mountroot, void * data )

static

Definition at line 904 of file vfs.cpp.

Referenced by vfs_sysfs_dentry_stats().

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vfs_sysfs_dentry_stats()

static bool vfs_sysfs_dentry_stats ( sysfs_file_t * f )

static

Definition at line 916 of file vfs.cpp.

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SYSFS_AUTOREGISTER()

SYSFS_AUTOREGISTER	(	vfs	,
		vfs_sysfs_items	)

Variable Documentation

vfs_fs_list

list_head vfs_fs_list

static

Definition at line 32 of file vfs.cpp.

Referenced by vfs_find_filesystem(), vfs_register_filesystem(), and vfs_sysfs_filesystems().

vfs_fs_list_lock

spinlock_t vfs_fs_list_lock

static

Definition at line 33 of file vfs.cpp.

Referenced by vfs_find_filesystem(), and vfs_register_filesystem().

file_io_ops

const io_op_t file_io_ops

static

Initial value:

= {
    .read = vfs_io_ops_read,
    .write = vfs_io_ops_write,
    .close = vfs_io_ops_close,
    .seek = vfs_io_ops_seek,
    .mmap = vfs_io_ops_mmap,
    .munmap = vfs_io_ops_munmap,
    .get_name = vfs_io_ops_getname,
}

Definition at line 259 of file vfs.cpp.

Referenced by vfs_do_open_dentry().

dir_io_ops

const io_op_t dir_io_ops

static

Initial value:

= {
    .read = vfs_list_dir,
    .close = vfs_io_ops_close_dir,
    .get_name = vfs_io_ops_getname,
}

Definition at line 269 of file vfs.cpp.

Referenced by vfs_do_open_dentry().

vfs_sysfs_items

sysfs_item_t vfs_sysfs_items[]

static

Initial value:

= {
    SYSFS_RO_ITEM("filesystems", vfs_sysfs_filesystems),
    SYSFS_RO_ITEM("mount", vfs_sysfs_mountpoints),
    SYSFS_RO_ITEM("dentry_stats", vfs_sysfs_dentry_stats),
}

Definition at line 922 of file vfs.cpp.

Referenced by SYSFS_AUTOREGISTER().