Filesystems and Virtual File System. More...

Modules
	Ctl
	Helpers to implement ctl (control) file operations.

	Dentry
	Directory entry.

	File
	Underlying type of a file descriptor.

	Inode
	Index node.

	Keys
	Keys for sharing file descriptors between processes.

	Mount
	Mount point.

	Namespaces
	Per-process Namespaces.

	Path
	Unique location in the filesystem.

	RAMFS
	RAM filesystem.

	Superblock
	Mountable filesystem.

	SysFS
	Filesystem for exposing kernel resources.

	VFS Context
	Virtual File System context.

Data Structures
struct	filesystem_t
	Filesystem structure, represents a filesystem type, e.g. fat32, ramfs, sysfs, etc. More...

struct	vfs_list_t
	Helper structure for lists with a lock. More...

struct	vfs_map_t
	Helper structure for maps with a lock. More...

Macros
#define	VFS_ROOT_ENTRY_NAME "__root__"
	The name of the root entry.

#define	VFS_DEVICE_NAME_NONE "__no_device__"
	The name used to indicate no device.

#define	BUFFER_READ(buffer, count, offset, src, size)
	Helper macros for implementing file operations dealing with simple buffers.

Functions
void	vfs_init (void)
	Initializes the VFS.

uint64_t	vfs_get_new_id (void)
	Generates a new unique ID.

uint64_t	vfs_register_fs (filesystem_t *fs)
	Registers a filesystem.

uint64_t	vfs_unregister_fs (filesystem_t *fs)
	Unregisters a filesystem.

filesystem_t *	vfs_get_fs (const char *name)
	Gets a filesystem by name.

inode_t *	vfs_get_inode (superblock_t *superblock, inode_number_t number)
	Get an inode for the given superblock and inode number.

dentry_t *	vfs_get_dentry (const dentry_t parent, const char name)
	Get a dentry for the given name. Will NOT traverse mountpoints.

dentry_t *	vfs_get_or_lookup_dentry (const path_t parent, const char name)
	Get or lookup a dentry for the given name. Will NOT traverse mountpoints.

uint64_t	vfs_add_inode (inode_t *inode)
	Add a inode to the inode cache.

uint64_t	vfs_add_dentry (dentry_t *dentry)
	Add a dentry to the dentry cache.

void	vfs_remove_superblock (superblock_t *superblock)
	Remove a superblock from the superblock list.

void	vfs_remove_inode (inode_t *inode)
	Remove an inode from the inode cache.

void	vfs_remove_dentry (dentry_t *dentry)
	Remove a dentry from the dentry cache.

uint64_t	vfs_walk (path_t outPath, const pathname_t pathname, walk_flags_t flags, process_t *process)
	Walk a pathname to a path, starting from the current process's working directory.

uint64_t	vfs_walk_parent (path_t outPath, const pathname_t pathname, char outLastName, walk_flags_t flags, process_t process)
	Walk a pathname to its parent path, starting from the current process's working directory.

uint64_t	vfs_walk_parent_and_child (path_t outParent, path_t outChild, const pathname_t pathname, walk_flags_t flags, process_t process)
	Walk a pathname to path and its parent path, starting from the current process's working directory.

bool	vfs_is_name_valid (const char *name)
	Check if a name is valid.

file_t *	vfs_open (const pathname_t pathname, process_t process)
	Open a file.

uint64_t	vfs_open2 (const pathname_t pathname, file_t files[2], process_t *process)
	Open one file, returning two file handles.

uint64_t	vfs_read (file_t file, void buffer, uint64_t count)
	Read from a file.

uint64_t	vfs_write (file_t file, const void buffer, uint64_t count)
	Write to a file.

uint64_t	vfs_seek (file_t *file, int64_t offset, seek_origin_t origin)
	Seek in a file.

uint64_t	vfs_ioctl (file_t file, uint64_t request, void argp, uint64_t size)
	Perform an ioctl operation on a file.

void *	vfs_mmap (file_t file, void address, uint64_t length, pml_flags_t flags)
	Memory map a file.

uint64_t	vfs_poll (poll_file_t *files, uint64_t amount, clock_t timeout)
	Poll multiple files.

uint64_t	vfs_getdents (file_t file, dirent_t buffer, uint64_t count)
	Get directory entries from a directory file.

uint64_t	vfs_stat (const pathname_t pathname, stat_t buffer, process_t *process)
	Get file information.

uint64_t	vfs_link (const pathname_t oldPathname, const pathname_t newPathname, process_t *process)
	Make the same file appear twice in the filesystem.

uint64_t	vfs_remove (const pathname_t pathname, process_t process)
	Remove a file or directory.

Detailed Description

Filesystems and Virtual File System.

Virtual File System.

TODO: Implement improved caching, LRU.

Macro Definition Documentation

◆ BUFFER_READ

#define BUFFER_READ	(	buffer,
		count,
		offset,
		src,
		size
	)

Value:

    ({ \
        uint64_t readCount = (*(offset) <= (size)) ? MIN((count), (size) - *(offset)) : 0; \
        memcpy((buffer), (src) + *(offset), readCount); \
        *(offset) += readCount; \
        readCount; \
    })

Helper macros for implementing file operations dealing with simple buffers.

Parameters

buffer	The destination buffer.
count	The number of bytes to read/write.
offset	A pointer to the current offset, will be updated.
src	The source buffer.
size	The size of the source buffer.

Returns: The number of bytes read/written.

Definition at line 372 of file vfs.h.

◆ VFS_DEVICE_NAME_NONE

#define VFS_DEVICE_NAME_NONE "__no_device__"

The name used to indicate no device.

Definition at line 39 of file vfs.h.

◆ VFS_ROOT_ENTRY_NAME

#define VFS_ROOT_ENTRY_NAME "__root__"

The name of the root entry.

Definition at line 34 of file vfs.h.

Function Documentation

◆ vfs_add_dentry()

uint64_t vfs_add_dentry ( dentry_t * dentry )

Add a dentry to the dentry cache.

Should not be used manually, instead use dentry_make_positive().

Parameters

dentry The dentry to add.

Returns: On success, 0. On failure, ERR and errno is set.

Definition at line 288 of file vfs.c.

References dentry_cache_key(), ERR, dentry_t::id, vfs_map_t::lock, vfs_map_t::map, map_insert(), dentry_t::mapEntry, dentry_t::name, dentry_t::parent, and RWLOCK_WRITE_SCOPE.

Referenced by dentry_new().

◆ vfs_add_inode()

uint64_t vfs_add_inode ( inode_t * inode )

Add a inode to the inode cache.

Should not be used manually, as it will be called in inode_new().

Parameters

inode The inode to add.

Returns: On success, 0. On failure, ERR and errno is set.

Definition at line 275 of file vfs.c.

References ERR, superblock_t::id, vfs_map_t::lock, vfs_map_t::map, map_insert(), inode_t::mapEntry, inode_t::number, RWLOCK_WRITE_SCOPE, and inode_t::superblock.

Referenced by inode_new().

◆ vfs_get_dentry()

dentry_t * vfs_get_dentry	(	const dentry_t *	parent,
		const char *	name
	)

Get a dentry for the given name. Will NOT traverse mountpoints.

Note that there is a period of time where a dentrys reference count has dropped to zero but its free function has not had the time to remove it from the cache yet. In this case, this function will return NULL and set errno to ESTALE.

Parameters

parent	The parent path.
name	The name of the dentry.

Returns: On success, the dentry, might be negative. On failure, returns NULL and errno is set.

Definition at line 215 of file vfs.c.

References dentry_cache_key(), EINVAL, errno, dentry_t::id, NULL, and vfs_get_dentry_internal().

◆ vfs_get_fs()

filesystem_t * vfs_get_fs ( const char * name )

Gets a filesystem by name.

Parameters

name	The name of the filesystem.

Returns: On success, the filesystem. On failure, returns NULL, does not set errno.

Definition at line 152 of file vfs.c.

References vfs_list_t::list, LIST_FOR_EACH, vfs_list_t::lock, filesystem_t::name, NULL, RWLOCK_READ_SCOPE, and strcmp().

Referenced by namespace_mount().

◆ vfs_get_inode()

inode_t * vfs_get_inode	(	superblock_t *	superblock,
		inode_number_t	number
	)

Get an inode for the given superblock and inode number.

Note that there is a period of time where a inodes reference count has dropped to zero but its free function has not had the time to remove it from the cache yet. In this case, this function will return NULL and set errno to ESTALE.

Parameters

superblock	The superblock.
number	The inode number.

Returns: On success, the inode. On failure, returns NULL and errno is set.

Definition at line 168 of file vfs.c.

References atomic_load, CONTAINER_OF_SAFE, ref_t::count, ENOENT, errno, ESTALE, superblock_t::id, vfs_map_t::lock, vfs_map_t::map, map_get(), NULL, inode_t::ref, REF, and RWLOCK_READ_SCOPE.

◆ vfs_get_new_id()

uint64_t vfs_get_new_id ( void )

Generates a new unique ID.

Returns: A new unique ID.

Definition at line 97 of file vfs.c.

References atomic_fetch_add.

Referenced by dentry_new(), mount_new(), and superblock_new().

◆ vfs_get_or_lookup_dentry()

dentry_t * vfs_get_or_lookup_dentry	(	const path_t *	parent,
		const char *	name
	)

Get or lookup a dentry for the given name. Will NOT traverse mountpoints.

Parameters

parent	The parent path.
name	The name of the dentry.

Returns: On success, the dentry, might be negative. On failure, returns NULL and errno is set.

Definition at line 227 of file vfs.c.

References assert, path_t::dentry, dentry_cache_key(), dentry_new(), DEREF_DEFER, EEXIST, EINVAL, ENOENT, ERR, errno, dentry_t::id, dentry_t::inode, inode_ops_t::lookup, path_t::mount, inode_t::mutex, MUTEX_SCOPE, NULL, inode_t::ops, REF, RFLAGS_INTERRUPT_ENABLE, rflags_read(), dentry_t::superblock, vfs_get_dentry_internal(), and vfs_remove_dentry().

Referenced by path_walk_single_step(), and sysfs_mount_new().

◆ vfs_getdents()

uint64_t vfs_getdents	(	file_t *	file,
		dirent_t *	buffer,
		uint64_t	count
	)

Get directory entries from a directory file.

Parameters

file	The directory file to read from.
buffer	The buffer to read into.
count	The number of bytes to read.

Returns: On success, the number of bytes read. On failure, ERR and errno is set.

Definition at line 1166 of file vfs.c.

References assert, buffer, count, EINVAL, ENOSYS, ENOTDIR, ERR, errno, file, dentry_ops_t::getdents, dentry_t::inode, INODE_DIR, inode_notify_access(), NULL, dentry_t::ops, dentry_t::parent, RFLAGS_INTERRUPT_ENABLE, rflags_read(), and inode_t::type.

Referenced by SYSCALL_DEFINE().

◆ vfs_init()

void vfs_init ( void )

Initializes the VFS.

Definition at line 83 of file vfs.c.

References key_init(), LOG_INFO, path_flags_init(), vfs_list_init(), and vfs_map_init().

Referenced by init_finalize().

◆ vfs_ioctl()

uint64_t vfs_ioctl	(	file_t *	file,
		uint64_t	request,
		void *	argp,
		uint64_t	size
	)

Perform an ioctl operation on a file.

Parameters

file	The file to perform the ioctl on.
request	The ioctl request.
argp	The argument pointer.
size	The size of the argument.

Returns: On success, the result of the ioctl. On failure, ERR and errno is set.

Definition at line 839 of file vfs.c.

References assert, EINVAL, EISDIR, ENOTTY, ERR, errno, file, dentry_t::inode, INODE_DIR, inode_notify_access(), NULL, dentry_t::ops, RFLAGS_INTERRUPT_ENABLE, rflags_read(), and inode_t::type.

Referenced by SYSCALL_DEFINE().

◆ vfs_is_name_valid()

bool vfs_is_name_valid ( const char * name )

Check if a name is valid.

A valid name is not "." or "..", only contains chars considered valid by PATH_VALID_CHAR, and is not longer than MAX_NAME - 1.

Parameters

name	The name to check.

Returns: true if the name is valid, false otherwise.

Definition at line 401 of file vfs.c.

References MAX_NAME, PATH_VALID_CHAR, and strcmp().

Referenced by path_walk_single_step().

◆ vfs_link()

uint64_t vfs_link	(	const pathname_t *	oldPathname,
		const pathname_t *	newPathname,
		process_t *	process
	)

Make the same file appear twice in the filesystem.

Parameters

oldPathname	The existing file.
newPathname	The new link to create, must not exist and be in the same filesystem as the oldPathname.
process	The process performing the linking.

Returns: On success, 0. On failure, ERR and errno is set.

Definition at line 1281 of file vfs.c.

References assert, atomic_load, path_t::dentry, DENTRY_NEGATIVE, EBADFLAG, EEXIST, EINVAL, ENOSYS, ERR, errno, EXDEV, pathname_t::flags, superblock_t::id, dentry_t::inode, inode_notify_change(), inode_notify_modify(), inode_ops_t::link, inode_t::mutex, mutex_acquire(), mutex_release(), NULL, inode_t::ops, PATH_DEFER, PATH_EMPTY, PATH_NONE, PATHNAME_IS_VALID, RFLAGS_INTERRUPT_ENABLE, rflags_read(), dentry_t::superblock, vfs_walk_parent_and_child(), WALK_NEGATIVE_IS_OK, and WALK_NONE.

Referenced by SYSCALL_DEFINE().

◆ vfs_mmap()

void * vfs_mmap	(	file_t *	file,
		void *	address,
		uint64_t	length,
		pml_flags_t	flags
	)

Memory map a file.

Parameters

file	The file to memory map.
address	The address to map to, or `NULL` to let the kernel choose.
length	The length to map.
flags	The page table flags for the mapping.

Returns: On success, the mapped address. On failure, returns NULL and errno is set.

Definition at line 889 of file vfs.c.

References address, assert, EISDIR, errno, file, dentry_t::inode, INODE_DIR, inode_notify_access(), NULL, dentry_t::ops, RFLAGS_INTERRUPT_ENABLE, rflags_read(), and inode_t::type.

Referenced by SYSCALL_DEFINE().

◆ vfs_open()

file_t * vfs_open	(	const pathname_t *	pathname,
		process_t *	process
	)

Open a file.

Parameters

pathname	The pathname of the file to open.
process	The process opening the file.

Returns: On success, the opened file. On failure, returns NULL and errno is set.

Definition at line 531 of file vfs.c.

References assert, path_t::dentry, DEREF_DEFER, EINVAL, ERR, errno, file, file_new(), pathname_t::flags, dentry_t::inode, INODE_FILE, inode_notify_access(), inode_truncate(), NULL, dentry_t::ops, PATH_DEFER, PATH_EMPTY, PATH_TRUNCATE, PATHNAME_IS_VALID, REF, RFLAGS_INTERRUPT_ENABLE, rflags_read(), inode_t::type, and vfs_open_lookup().

Referenced by init_process_spawn(), loader_load_program(), and SYSCALL_DEFINE().

◆ vfs_open2()

uint64_t vfs_open2	(	const pathname_t *	pathname,
		file_t *	files[2],
		process_t *	process
	)

Open one file, returning two file handles.

Used to for example implement pipes.

Parameters

pathname	The pathname of the file to open.
files	The output array of two file pointers.
process	The process opening the file.

Returns: On success, 0. On failure, ERR and errno is set.

Definition at line 593 of file vfs.c.

References assert, path_t::dentry, DEREF_DEFER, EINVAL, ENOSYS, ERR, errno, file_new(), files, pathname_t::flags, dentry_t::inode, INODE_FILE, inode_notify_access(), inode_truncate(), NULL, ops, PATH_DEFER, PATH_EMPTY, PATH_TRUNCATE, PATHNAME_IS_VALID, REF, RFLAGS_INTERRUPT_ENABLE, rflags_read(), inode_t::type, and vfs_open_lookup().

Referenced by SYSCALL_DEFINE().

◆ vfs_poll()

uint64_t vfs_poll	(	poll_file_t *	files,
		uint64_t	amount,
		clock_t	timeout
	)

Poll multiple files.

Parameters

files	The array of files to poll.
amount	The number of files in the array.
timeout	The timeout in clock ticks, or `CLOCKS_NEVER` to wait indefinitely.

Returns: On success, the number of files that are ready. On failure, ERR and errno is set.

Definition at line 1021 of file vfs.c.

References CLOCKS_NEVER, CONFIG_MAX_FD, EINVAL, EISDIR, ENOSYS, ERR, errno, ETIMEDOUT, file, files, dentry_t::inode, INODE_DIR, NULL, dentry_t::ops, vfs_poll_ctx_t::queueAmount, vfs_poll_ctx_t::queues, timer_uptime(), inode_t::type, uptime(), vfs_poll_ctx_check_events(), vfs_poll_ctx_init(), wait_block_cancel(), wait_block_commit(), and wait_block_setup().

Referenced by SYSCALL_DEFINE().

◆ vfs_read()

uint64_t vfs_read	(	file_t *	file,
		void *	buffer,
		uint64_t	count
	)

Read from a file.

Follows POSIX semantics.

Parameters

file	The file to read from.
buffer	The buffer to read into.
count	The number of bytes to read.

Returns: On success, the number of bytes read. On failure, ERR and errno is set.

Definition at line 694 of file vfs.c.

References assert, buffer, count, EINVAL, EISDIR, ENOSYS, ERR, errno, file, dentry_t::inode, INODE_DIR, inode_notify_access(), NULL, dentry_t::ops, RFLAGS_INTERRUPT_ENABLE, rflags_read(), and inode_t::type.

Referenced by loader_load_program(), and SYSCALL_DEFINE().

◆ vfs_register_fs()

uint64_t vfs_register_fs ( filesystem_t * fs )

Registers a filesystem.

Parameters

fs	The filesystem to register.

Returns: On success, 0. On failure, ERR and errno is set.

Definition at line 102 of file vfs.c.

References EEXIST, EINVAL, filesystem_t::entry, ERR, errno, vfs_list_t::list, list_entry_init(), LIST_FOR_EACH, list_push(), vfs_list_t::lock, MAX_NAME, filesystem_t::name, NULL, RWLOCK_WRITE_SCOPE, strcmp(), and strnlen_s().

Referenced by ramfs_init(), and sysfs_init().

◆ vfs_remove()

uint64_t vfs_remove	(	const pathname_t *	pathname,
		process_t *	process
	)

Remove a file or directory.

Parameters

pathname	The pathname of the file or directory to remove.
process	The process performing the removal.

Returns: On success, 0. On failure, ERR and errno is set.

Definition at line 1377 of file vfs.c.

References assert, path_t::dentry, EINVAL, EISDIR, ENOTDIR, EPERM, ERR, errno, pathname_t::flags, dentry_t::inode, INODE_DIR, INODE_FILE, inode_notify_change(), inode_t::mutex, mutex_acquire(), mutex_release(), NULL, inode_t::ops, PATH_DEFER, PATH_DIRECTORY, PATH_EMPTY, PATHNAME_IS_VALID, inode_ops_t::remove, RFLAGS_INTERRUPT_ENABLE, rflags_read(), inode_t::type, vfs_remove_dentry(), vfs_walk_parent_and_child(), and WALK_NONE.

Referenced by SYSCALL_DEFINE().

◆ vfs_remove_dentry()

void vfs_remove_dentry ( dentry_t * dentry )

Remove a dentry from the dentry cache.

Parameters

dentry The dentry to remove.

Definition at line 324 of file vfs.c.

References dentry_cache_key(), dentry_t::id, vfs_map_t::lock, vfs_map_t::map, map_remove(), dentry_t::name, NULL, dentry_t::parent, and RWLOCK_WRITE_SCOPE.

Referenced by dentry_free(), vfs_get_or_lookup_dentry(), and vfs_remove().

◆ vfs_remove_inode()

void vfs_remove_inode ( inode_t * inode )

Remove an inode from the inode cache.

Parameters

inode The inode to remove.

Definition at line 312 of file vfs.c.

References superblock_t::id, vfs_map_t::lock, vfs_map_t::map, map_remove(), NULL, inode_t::number, RWLOCK_WRITE_SCOPE, and inode_t::superblock.

Referenced by inode_free().

◆ vfs_remove_superblock()

void vfs_remove_superblock ( superblock_t * superblock )

Remove a superblock from the superblock list.

Parameters

superblock The superblock to remove.

Definition at line 301 of file vfs.c.

References superblock_t::entry, vfs_list_t::list, list_remove(), vfs_list_t::lock, NULL, and RWLOCK_WRITE_SCOPE.

Referenced by superblock_free().

◆ vfs_seek()

uint64_t vfs_seek	(	file_t *	file,
		int64_t	offset,
		seek_origin_t	origin
	)

Seek in a file.

Follows POSIX semantics.

Parameters

file	The file to seek in.
offset	The offset to seek to.
origin	The origin to seek from.

Returns: On success, the new file position. On failure, ERR and errno is set.

Definition at line 807 of file vfs.c.

References assert, EINVAL, ERR, errno, ESPIPE, file, NULL, dentry_t::ops, RFLAGS_INTERRUPT_ENABLE, and rflags_read().

Referenced by loader_load_program(), and SYSCALL_DEFINE().

◆ vfs_stat()

uint64_t vfs_stat	(	const pathname_t *	pathname,
		stat_t *	buffer,
		process_t *	process
	)

Get file information.

Parameters

pathname	The pathname of the file to get information about.
buffer	The buffer to store the file information in.
process	The process performing the stat.

Returns: On success, 0. On failure, ERR and errno is set.

Definition at line 1222 of file vfs.c.

References inode_t::accessTime, inode_t::blocks, buffer, inode_t::changeTime, inode_t::createTime, path_t::dentry, EBADFLAG, EINVAL, ERR, errno, pathname_t::flags, dentry_t::inode, inode_t::linkCount, MAX_NAME, memset(), inode_t::modifyTime, inode_t::mutex, MUTEX_SCOPE, dentry_t::name, NULL, inode_t::number, PATH_DEFER, PATH_EMPTY, PATH_NONE, PATHNAME_IS_VALID, inode_t::size, strncpy(), inode_t::type, vfs_walk(), and WALK_NONE.

Referenced by loader_spawn(), and SYSCALL_DEFINE().

◆ vfs_unregister_fs()

uint64_t vfs_unregister_fs ( filesystem_t * fs )

Unregisters a filesystem.

Parameters

fs	The filesystem to unregister.

Returns: On success, 0. On failure, ERR and errno is set.

Definition at line 127 of file vfs.c.

References EBUSY, EINVAL, filesystem_t::entry, ERR, errno, superblock_t::fs, vfs_list_t::list, LIST_FOR_EACH, list_remove(), vfs_list_t::lock, filesystem_t::name, NULL, RWLOCK_READ_SCOPE, RWLOCK_WRITE_SCOPE, and strcmp().

◆ vfs_walk()

uint64_t vfs_walk	(	path_t *	outPath,
		const pathname_t *	pathname,
		walk_flags_t	flags,
		process_t *	process
	)

Walk a pathname to a path, starting from the current process's working directory.

Parameters

outPath	The output path.
pathname	The pathname to walk.
flags	Flags for the path walk.
process	The process whose namespace and working directory to use.

Returns: On success, 0. On failure, ERR and errno is set.

Definition at line 341 of file vfs.c.

References EINVAL, ERR, errno, NULL, PATH_DEFER, PATH_EMPTY, path_walk(), PATHNAME_IS_VALID, vfs_ctx_get_cwd(), and process_t::vfsCtx.

Referenced by SYSCALL_DEFINE(), SYSCALL_DEFINE(), SYSCALL_DEFINE(), vfs_open_lookup(), and vfs_stat().

◆ vfs_walk_parent()

uint64_t vfs_walk_parent	(	path_t *	outPath,
		const pathname_t *	pathname,
		char *	outLastName,
		walk_flags_t	flags,
		process_t *	process
	)

Walk a pathname to its parent path, starting from the current process's working directory.

Parameters

outPath	The output parent path.
pathname	The pathname to walk.
outLastName	The output last component name.
flags	Flags for the path walk.
process	The process whose namespace and working directory to use.

Returns: On success, 0. On failure, ERR and errno is set.

Definition at line 359 of file vfs.c.

References EINVAL, ERR, errno, NULL, PATH_DEFER, PATH_EMPTY, path_walk_parent(), PATHNAME_IS_VALID, vfs_ctx_get_cwd(), and process_t::vfsCtx.

Referenced by vfs_walk_parent_and_child().

◆ vfs_walk_parent_and_child()

uint64_t vfs_walk_parent_and_child	(	path_t *	outParent,
		path_t *	outChild,
		const pathname_t *	pathname,
		walk_flags_t	flags,
		process_t *	process
	)

Walk a pathname to path and its parent path, starting from the current process's working directory.

Parameters

outParent	The output parent path.
outChild	The output path.
pathname	The pathname to walk.
flags	Flags for the path walk.
process	The process whose namespace and working directory to use.

Returns: On success, 0. On failure, ERR and errno is set.

Definition at line 378 of file vfs.c.

References ERR, MAX_NAME, path_copy(), PATH_DEFER, PATH_EMPTY, path_walk_single_step(), vfs_walk_parent(), and WALK_NONE.

Referenced by vfs_create(), vfs_link(), and vfs_remove().

◆ vfs_write()

uint64_t vfs_write	(	file_t *	file,
		const void *	buffer,
		uint64_t	count
	)

Write to a file.

Follows POSIX semantics.

Parameters

file	The file to write to.
buffer	The buffer to write from.
count	The number of bytes to write.

Returns: On success, the number of bytes written. On failure, ERR and errno is set.

Definition at line 748 of file vfs.c.

References assert, buffer, count, EINVAL, EISDIR, ENOSYS, ERR, errno, file, dentry_t::inode, INODE_DIR, inode_notify_modify(), NULL, dentry_t::ops, PATH_APPEND, RFLAGS_INTERRUPT_ENABLE, rflags_read(), SEEK_END, and inode_t::type.

Referenced by SYSCALL_DEFINE().

Modules

Data Structures

Macros

Functions

Detailed Description

Macro Definition Documentation

◆ BUFFER_READ

◆ VFS_DEVICE_NAME_NONE

◆ VFS_ROOT_ENTRY_NAME

Function Documentation

◆ vfs_add_dentry()

◆ vfs_add_inode()

◆ vfs_get_dentry()

◆ vfs_get_fs()

◆ vfs_get_inode()

◆ vfs_get_new_id()

◆ vfs_get_or_lookup_dentry()

◆ vfs_getdents()

◆ vfs_init()

◆ vfs_ioctl()

◆ vfs_is_name_valid()

◆ vfs_link()

◆ vfs_mmap()

◆ vfs_open()

◆ vfs_open2()

◆ vfs_poll()

◆ vfs_read()

◆ vfs_register_fs()

◆ vfs_remove()

◆ vfs_remove_dentry()

◆ vfs_remove_inode()

◆ vfs_remove_superblock()

◆ vfs_seek()

◆ vfs_stat()

◆ vfs_unregister_fs()

◆ vfs_walk()

◆ vfs_walk_parent()

◆ vfs_walk_parent_and_child()

◆ vfs_write()