POSIX: introduce ppoll

will appear in the next version: https://www.opengroup.org/austin/docs/austin_1110.pdf

Change-Id: I38014ad910881df260f0ec762831491e143328c4
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4099
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

POSIX: add posix_fallocate and a preallocate syscall

the preallocate syscall will call the preallocate filesystem hook, if available.

fix #6285

Change-Id: Ifff4595548610c8e009d4e5ffb64c37e0884e62d
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3382
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>

kernel/fs: Add support for setting custom VMCaches in vnodes.

This adds one (private) VFS function, and checks in all usages of
the vnode->cache as a VMVnodeCache that it really is one. (Generic
usages, for the moment just the ReleaseRef() calls in vnode
destruction, are intentionally not touched.)

This will be used by ramfs to set the cache from its own,
so that map_file() calls on a ramfs can work.

vfs: Bind flock locks to file descriptors

* File locks created by flock should only apply for the file descriptor
that was used to lock the file. Another fd on the same file should then
be denied access (calling flock should fail).
* fcntl based locks, however, are in a separate namespace and are global
to a team.
* This issue was found when running webkitpy test suite, and should close
ticket #13795.
* Don't use session or team as comparison in release_advisory_lock(), as
that information might not be available anymore (e.g. when called from
Team::~Team()). This fixes #14121.

Change-Id: I9efb96cfcefe7e72b0060220c635a665e7e643cc
Co-authored-by: Axel Dörfler <axeld@pinc-software.de>

NodeMonitor: Resolve mount points for B_WATCH_CHILDREN.

* When a watched directory contains a mount point, we need to resolve
the actual parent directory of the mount point in the file system to
serve the monitor.

VFS: prevent FD inheritance for the kernel completely.

* Each io_context now has a "inherit_fds" member that decides whether
or not this context allows to inherit FDs to its children.
* This replaces the former O_CLOEXEC mechanism.

Make vfs_resize_fd_table() accessible in the kernel

Also update some types from int to uint32.

Fix _user_entry_ref_to_path() in chroot

* Add "bool kernel" parameter to vfs_entry_ref_to_path(), so it can be
specified for which I/O context the entry ref shall be translated.
* _user_entry_ref_to_path(): Use the calling team's I/O context instead
of the kernel's. Fixes the bug that in a chroot the syscall would
return a path for outside the chroot.

Changed argument type of fcntl syscall from uint32 to size_t.

Since this argument may be used to pass pointers, uint32 is not
correct for 64-bit. Effectively no change on 32-bit targets, both
size_t and uint32 are unsigned long there.

Add support for bind-mounting directories

* Add support function vfs_get_mount_point(), so a file system can get
its own mount point (i.e. the node it covers). Re-added
fs_mount::covers_vnode for that purpose -- the root node isn't know to
the VFS before the mount() hook returns.
* Add function vfs_bind_mount_directory() which bind-mounts a directory
to another. The Vnode::covers/covered_by mechanism is used, so this
isn't true bind-mounting, but sufficient for what we need ATM and
cheaper as well. The vnodes connected thus aren't tracked yet, which
is needed for undoing the connection when unmounting.
* get_vnode_name(): Don't use dir_read() to read the directory. Since we
have already resolved vnode to the covered vnode, we don't want the
dirents to be "fixed" to refer to the covering nodes. Such a vnode
simply wouldn't be found.

Add vfs_ prefix to resolve_vnode_to_covering_vnode()

Generalize use of Vnode::covered_by/covers

* Introduce Vnode flags for covered and covering. Can be used as a quick
check when one doesn't already hold sVnodeLock.
* Rename resolve_mount_point_to_volume_root() to
resolve_vnode_to_covering_vnode().
* Adjust all code that deals with transitions between mount points and
volume root vnodes to generally support covered/covering vnodes.

* Introduced new fs_lopen_attr_dir() function that opens the attribute
directory of a file without traversing leaf links (just like lstat()).
* Minor cleanup.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@42620 a95241bf-73f2-0310-859d-f6bbb57e9c96

Add support for bind-mounting directories

* Add support function vfs_get_mount_point(), so a file system can get
its own mount point (i.e. the node it covers). Re-added
fs_mount::covers_vnode for that purpose -- the root node isn't know to
the VFS before the mount() hook returns.
* Add function vfs_bind_mount_directory() which bind-mounts a directory
to another. The Vnode::covers/covered_by mechanism is used, so this
isn't true bind-mounting, but sufficient for what we need ATM and
cheaper as well. The vnodes connected thus aren't tracked yet, which
is needed for undoing the connection when unmounting.
* get_vnode_name(): Don't use dir_read() to read the directory. Since we
have already resolved vnode to the covered vnode, we don't want the
dirents to be "fixed" to refer to the covering nodes. Such a vnode
simply wouldn't be found.

Add vfs_ prefix to resolve_vnode_to_covering_vnode()

Generalize use of Vnode::covered_by/covers

* Introduce Vnode flags for covered and covering. Can be used as a quick
check when one doesn't already hold sVnodeLock.
* Rename resolve_mount_point_to_volume_root() to
resolve_vnode_to_covering_vnode().
* Adjust all code that deals with transitions between mount points and
volume root vnodes to generally support covered/covering vnodes.

* add implementation of bindfs, which can be used to bind-mount
a folder to some other place in the filesystem hierarchy
* add helper function to VFS that encapsulates the "conversion" of a
vnode-pointer to a fs_vnode-pointer (used by bindfs)

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40238 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Introduced type generic_io_vec, which is similar to iovec, but uses types
that are wide enough for both virtual and physical addresses.
* DMABuffer, IORequest, IOScheduler,... and code using them: Use
generic_io_vec and generic_{addr,size}_t where necessary.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@36997 a95241bf-73f2-0310-859d-f6bbb57e9c96

Changed the type of the "op" parameter of the fs_vnode_ops::ioctl() hook and
the _kern_ioctl() syscall from ulong to uint32.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@36927 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Introduced {malloc,memalign,free}_etc() which take an additional "flags"
argument. They replace the previous special-purpose allocation functions
(malloc_nogrow(), vip_io_request_malloc()).
* Moved the I/O VIP heap to heap.cpp accordingly.
* Added quite a bit of passing around of allocation flags in the VM,
particularly in the VM*AddressSpace classes.
* Fixed IOBuffer::GetNextVirtualVec(): It was ignoring the VIP flag and always
allocated on the normal heap.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35316 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Forgot to add linkat(), this really closes #4928 now.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34289 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Added missing AT_EACCESS.
* Implemented renameat(), faccessat(), fchownat(), fchmodat(), and mkfifoat().
* Added stub for mknodat().
* The kernel backend for faccessat() does not yet differentiate between
effective and real user/group IDs, though.
* Removed B_ENABLE_INCOMPLETE_POSIX_AT_SUPPORT, as we now support everything
(more or less). This also closes ticket #4928.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34288 a95241bf-73f2-0310-859d-f6bbb57e9c96

* load_image() now has exec() semantics wrt file descriptors; before each team
would always inherit them all, causing quite a number of open files.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34247 a95241bf-73f2-0310-859d-f6bbb57e9c96

* VFS:
- Fixed vfs_get_vnode_from_fd() return type.
- Added vfs_open_vnode().
- Added a "bool traverseLeafLink" parameter to vfs_get_fs_node_from_path().
It was always resolving symlinks.
* device manager/devfs:
- devfs: get_node_for_path() no longer resolves leaf symlinks. That still
doesn't help with file disk devices, as creating partition wouldn't work
anyway.
- Pulled the module-related implementation part of BaseDevice into new class
AbstractModuleDevice and made all methods of BaseDevice virtual. Small
adjustments to devfs to be happy with the new BaseDevice interface.
- Added BaseDevice subclass FileDevice, which maps the interface to a file's
file descriptor. Still got a few TODOs, but should basically work.
- Use FileDevice for publishing file disk devices in devfs. Now those do
actually work, though there's some BFS trouble with one of the images I
tested.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33385 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Introduced dedicated syscalls for the deprecated BeOS fs_attr API. Before,
each attribute access needed 3 syscalls, now only one as it should.
* Renamed the new Haiku call fs_open_attr() to fs_fopen_attr(), and added a new
function fs_open_attr() that takes a path (same semantics as the
fs_[f]open_attr_dir() functions already present in BeOS).
* Merged former _kern_open_attr(), and _kern_create_attr() into one syscall.
* Cleaned up vfs.h.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@31881 a95241bf-73f2-0310-859d-f6bbb57e9c96

axeld:
* Implemented a way to do asynchronous pre-fetching when mapping files.
* There are slight code duplications in some places that could benefit
from cleaning up, but nothing too bad.
* Implementing smarter ways to trigger prefetching and more analysis of
the situations in the kernel would be nice. Currently up to 10 MB
of every mapped file are pre-fetched without further analysis.
* The speed improvement is nice for certain operations. On our test
system (real hardware), Firefox took 9 seconds from being launched
to display a window. Now it takes 5 seconds. Both measurements
right after booting. The same system took 35 seconds from launching
Haiku in the GRUB menu to displaying the Tracker desktop background
image. Now it takes 27 seconds.
* We didn't have the chance to check out the effects of this on the
CD boot, but potentially, they could speed it up a lot.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@30465 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Introduced ref-counting for the I/O contexts.
* The I/O context related vfs_*() functions have io_context* instead of void*
parameters/return values, now.
* vfs_new_io_context(): Lock the parent I/O context before getting its table
size. Otherwise the table size could change until we do.
* vfs_resize_fd_table(): Fixed use of MutexLocker. We created only a temporary
object, not one with function scope.
* Renamed load_image_etc() to load_image_internal() and added a parameter for
specifying the parent team of the one to create.
* Introduced a kernel private load_image_etc() with a few more arguments than
load_image().


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29375 a95241bf-73f2-0310-859d-f6bbb57e9c96

* vfs_normalize_path() and _user_normalize_path() use a common helper
function (normalize_path()), now. There was some code duplication
before.
* Added "bool traverseLink" parameter to vfs_normalize_path(). When
true and the leaf component is a symlink, it will be resolved.
* KPath:
- Added similar leaf link traversal parameter to SetTo() and
SetPath().
- Added Normalize().
- Added DetachBuffer(), which returns the object's current buffer and
unsets itself.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27751 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added method vfs_asynchronous_write_pages(), which, unsurprisingly,
writes the given page iovecs asynchronously. The new class
AsyncIOCallback is used to inform the caller when the request has been
finished.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27055 a95241bf-73f2-0310-859d-f6bbb57e9c96

* It is now supported that I/O operations and requests are only handled
partially (e.g. due to hitting the end of file). The respective
classes have grown new methods and attributes to deal with that. The
"finished" callbacks have got additional parameters to indicate
whether the transfer was only partial and how much has been
transferred. Other callbacks and functions have a size_t* in/out
parameter instead of a simple size_t, now.
* vfs_{read,write}_pages() do now use the I/O request framework instead
of the underlying FS's {read,write}_pages() hooks (those should be
unused now). Furthermore they've got an additional "flags" parameter,
which is passed to IORequest::Init(), i.e. it allows to specify that
the given vecs refer to physical addresses.
* The file cache's read_into_cache() reads directly into physical
pages, now.
* Fixed bug in DoIO::IO(): The offset was not adjusted, so that all
pages were incorrectly transferred from/to the same location.
* Fixed broken subrequest scheduling loop head in
do_iterative_fd_io_iterate().
* Adjusted the test driver and implemented its io() hook. Using this
driver I/O requests are passed all the way from the VFS/VM to the
driver and through the I/O scheduler. It even seems to work. :-)
* Added missing const to the iovec* parameter of the IORequest::Init()
methods.
* Disabled some debug output by default. Added new optional debug
output.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26692 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added kernel private vfs_vnode_io() which performs an io_request on a
vnode (falling back to synchronous I/O if the io() is not supported).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26672 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Added FS interface hooks io() and cancel_io(). The former is supposed
to provide asynchrounous (or only synchronous, if asynchronous is not
supported) I/O request support. It will eventually replace
{read,write}_pages(). None of the FS implementations implement them
yet.
* Implemented some support functions for request-based I/O. File system
implementations can use do_fd_io() which passes an I/O request to the
layer responsible for a given FD, and do_iterative_fd_io(), which
translates a request for a file to subrequests for the underlying
device and passes them on. Both fall back to synchrounous processing
when the io() hook is not supported.
Furthermore added vfs_synchronous_io() which should be handy for the
devfs to perform io_requests synchronously for devices that don't
support the io() hook.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26655 a95241bf-73f2-0310-859d-f6bbb57e9c96

* bfs_fsync() was the only place which could cause the
fs_vnode_ops::write_pages() to be called with fsReenter = true. Since
this is no longer the case, the argument has become superfluous. For
read_pages() it always was. Removed the argument from the functions
and all functions that propagated it.
* Some whitespace at the end of lines was removed.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26579 a95241bf-73f2-0310-859d-f6bbb57e9c96

Merged branch haiku/branches/developer/bonefish/vm into trunk. This
introduces the following relevant changes:
* VMCache:
- Renamed vm_cache to VMCache, merged it with vm_store and made it a
C++ class with virtual methods (replacing the store operations).
Turned the different store implementations into subclasses.
- Introduced MergeStore() callback, changed semantics of Commit().
- Changed locking and referencing semantics. A reference can only be
acquired/released with the cache locked. An unreferenced cache is
deleted and a mergeable cache merged when it is unlocked. This
removes the "busy" state of a cache and simplifies the page fault
code.
* Added VMAnonymousCache, which will implement swap support (work by
Zhao Shuai). It is not integrated and used yet, though.
* Enabled the mutex/recursive lock holder asserts.
* Fixed DoublyLinkedList::Swap().
* Generalized the low memory handler to a low resource handler. And made
semaphores and reserved memory handled resources. Made
vm_try_resource_memory() optionally wait (with timeout), and used that
feature to reserve memory for areas.
...


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26572 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Introduced new header directory headers/private/system which is supposed
to contain headers shared by kernel and userland (mainly libroot).
* Moved quite a few private kernel headers to the new location. Split
several kernel headers into a shared part and one that is still kernel
private. Adjusted all affected Jamfiles and source in the standard x86
build accordingly. The build for other architectures and for test code
may be broken.
* Quite a bit of userland code still includes private kernel headers.
Mostly those are <util/*> headers. The ones that aren't strictly
kernel-only should be moved to some other place (maybe
headers/private/shared/util).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25486 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Changed the way the socket functions work:
- The net_stack driver is no longer used. Instead we have a kernel
module which is directly used by syscall implementations in the
kernel. I.e. we no longer tunnel those functions through ioctls, but
have normal syscalls.
- Removed the superfluous net starter module.
- Implemented the FDTYPE_SOCKET type file_descriptors, that is sockets
are no longer vnode based.
- Adjusted libnetwork (the socket function implementations)
accordingly.
- Adjusted netstat accordingly.
* Socket module:
- Implemented socketpair().
- Added "kernel" parameter to the control hook. Quite a few more hooks
would actually need the parameter, but I didn't change those yet,
since that would probably also require changes to the protocol
module interface.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24908 a95241bf-73f2-0310-859d-f6bbb57e9c96

New service function vfs_create_special_node() to create special nodes.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24883 a95241bf-73f2-0310-859d-f6bbb57e9c96

Rename vfs_stat_entry_ref() to vfs_stat_node_ref() as that's what a dev_t and
ino_t combination really is.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24825 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Added _kern_create_pipe() syscall, creating a pipe as an entryless
FIFO. Reimplemented pipe() to use it.
* pipefs is no longer mounted. Will remove the superfluous code soon.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24823 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Reorganized the FS interface a little:
- Moved most file_system_module_info hooks into separate structures.
Those that operate on mounted volumes to fs_volume_ops, those
operating on a vnode to fs_vnode_ops.
- Got rid of the fs_volume, fs_cookie, fs_vnode typedefs. We use void*
again.
- Instead of a void* volume and node cookie hooks are passed a
fs_volume and fs_vnode structure pointer, which contain the cookie
and an ops pointer (fs_volume a few more things).
- The VFS {new,publish,get,...}_vnode() functions take a fs_volume*
instead of the volume ID. So does vfs_get_fs_node_from_path().
- Added type and flags arguments to publish_vnode() and the
get_vnode() hook and removed the type argument from lookup() hook.
Added vnode::type using formerly unused bits to store the node type.
Simplified a few things in the VFS due to the now always available
node type.
- Added fs_volume_ops::{create,delete}_sub_vnode() and
fs_vnode_ops::get_super_vnode() hooks. They are used to support file
system layers, e.g. allowing to extend an FS not supporting BeOS
attribute with attribute support. Needs some more work in the VFS.
- Added fs_vnode_ops::create_special_node() hook for creating special
nodes (e.g. FIFOs).
* Adjusted the built-in file systems and BFS according to the interface
changes. Removed all other FSs from the image for the time being.
We'll see whether further API changes are necessary before porting
them.
* Adjusted the bfs_shell accordingly.
* Implemented create_special_node() in rootfs to support special nodes.
* Added support for FIFOs:
- Added syscall _kern_create_fifo() (used by mkfifo()), which creates
a special node (type S_IFIFO) in the respective file system.
- When a special node is published the VFS creates a respective sub
node. Currently only FIFOs are supported.
- Added a little support for FIFO subnodes by using functionality from
the pipefs.
- Added mkfifo to the image. It can create FIFOs in the rootfs, but
the FIFOs aren't really usable ATM, since they still work like
pipes, i.e. readers and writers need to have them open at the same
time.
* Some smaller changes in the VFS:
- Made the *_CALL macros nicer to use (vargs).
- Refactored FS entry lookup into new function lookup_dir_entry().
- create_vnode() no longer just calls the FS create() hook. First it
looks up the entry and uses open_vnode(), if it already exists. This
is necessary for two reasons: 1) The FS might not support create()
while still allowing to open() entries. 2) When the FS has other
layers on to of it (or the respective node) it might not be
responsible for opening the node.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24816 a95241bf-73f2-0310-859d-f6bbb57e9c96

Introduce vfs_stat_entry_ref() that allows to stat a vnode based on a dev_t
and ino_t instead of a path. Supposed to work with node monitoring messages.
Took the name from vfs_entry_ref_to_path() that takes the same arguments, but
suggestions for a better name are welcome.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24813 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Implemented support for chroot:
- Added a "root" vnode to the io_context. It is used for resolving
paths and converting nodes to paths instead of sRoot. Some more
passing around of io_context structures was necessary.
- Introduced a new lock sIOContextRootLock to protect
io_context::root. The current uses of io_context::io_mutex
(put_vnode(), remove_vnode() while holding it) looked too suspicious
to use that mutex in vnode_path_to_vnode().
- Added _kern_change_root() syscall and chroot() libroot function.
- Added chroot coreutils program to the image. Funnily it seems to be
much easier to set up a little jail than under Linux (just copy
bash and libroot.so into respective subdirs; mount another pipefs
if you want pipe support).
With Haiku allowing direct access to directories via inode IDs
jailing is obviously not very secure at the moment.
- Added /var/empty to the image. It will be the chroot target for ssh.
* Changed vfs.cpp:get_cwd() so that the io_context::io_mutex is no
longer held when calling dir_vnode_to_path().


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24673 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added function vfs_read_stat() that also allows for stat()ing files in
the user IO context from within the kernel.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24667 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Factored a vfs_entry_ref_to_path() out of _user_entry_ref_to_path()
and made it public (within the kernel).
* _user_entry_ref_to_path() is now using that function.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24151 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added new syscall _kern_normalize_path() to normalize a path.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23929 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Implemented flock() semantics to the advisory locking backend. Not tested
(must also compare to BSD; I've looked at their sources, but I might have
missed something).
* Added sys/file.h and the flock() system call.
* common_fcntl() could forget to put back the file descriptor on some error
conditions (I guess we should introduce and use a DescriptorGetter class).
* Cleaned up fcntl.h, moved the BSD extensions S_IREAD and S_IWRITE to
sys/stat.h where they belong, and added the missing S_IEXEC to them.
* Added some more comments.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23836 a95241bf-73f2-0310-859d-f6bbb57e9c96

axeld + bonefish: Missed those changes in the previous commit:
* Added vfs_unmount(), which allows unmounting by dev_t (used by the DDM).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22910 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Extracted file_map API out of the file cache - it's now an optional service
that can be used by file systems.
* Changed the way the file cache works: instead of reading/writing to the
underlying device directly, it can now be used for any data source, ie.
also network file systems.
* As a result, the former pages_io() moved to the VFS layer, and can now be
called by a file system via {read|write}_file_io_vec_pages() (naming
suggestions are always welcomed :-)). It now gets an FD, and uses that to
communicate with the device (via its fs_{read|write}_pages() hooks).
* The file_cache_{read|write}() functions must now be called without holding
an I/O relevant file system lock. That allows the file cache to prepare the
pages without colliding with the page writer, IOW the "mayBlock" flag can
go into the attic again (yay!).
* This also results in a much better performance when the system does I/O and
is low on memory, as the page writer can now finally write back some pages,
and that even without maxing out the CPU :)
* The API changes put slightly more burden on the fs_{read|write}_pages()
hooks, but in combination with the file_map it's still pretty straight
forward. It just will have to dispatch the call to the underlying device
directly, usually it will just call its fs_{read|write}_pages() hooks
via the above mentioned calls.
* Ported BFS and FAT to the new API, the latter has not been tested, though.
* Also ported the API changes to the fs_shell. I also completely removed its
file cache level page handling - the downside is that device access is no
longer cached (ie. depends on the host OS now), the upside is that the code
is greatly simplified.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22886 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Added a "canWait" argument to vfs_get_vnode() - you can use this to ignore
busy vnodes.
* dir_create_entry_ref() used get_vnode() incorrectly (and could therefore
potentially prevent a file system from doing proper locking when called
from the kernel).
* The vnode_store now uses this for its acquire_unreferenced_ref()
implementation (and therefore for the page writer).
* read_into_cache() and write_to_cache() were still marked inline.
* The system will now wait 10 secs for a busy vnode before returning an error.
* It will also no longer panic in that case.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22485 a95241bf-73f2-0310-859d-f6bbb57e9c96

* struct vnode is an opaque type now, removed void* where it was used incorrectly.
* Minor cleanup.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22461 a95241bf-73f2-0310-859d-f6bbb57e9c96

* fs_{write|read}_pages() now has an additional argument "mayBlock".
* the page writer don't allow to block, while all other writers do. This fixes
bug #1509. The reason the page writer needs this is because it marks several
pages from different caches as busy.
* Fixed a warning about ASSERT being defined already in BFS, since
util/DoublyLinkedList.h now includes debug.h.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22434 a95241bf-73f2-0310-859d-f6bbb57e9c96

* fd.c -> fd.cpp
* Reworked the select support:
- The io_context additionally stores a table of lists of select_infos,
which enables it to deselect events of a pending select() when
closing a FD. This prevents a race condition potentially causing a
write to stale memory.
- The opaque selectsync* passed to FSs is now actually a select_info*.
This was necessary, since the FDs deselect() hook (unlike the
select() hook) doesn't take a "ref" argument and deselecting a
single info (e.g. caused by a premature close()) was not possible.
The select() hook's "ref" argument has become superfluous.
- It should now be relatively easy to implement a poll_on_steroids()
that can also wait for objects other than FDs (e.g. semaphores,
ports, threads etc.).
* Set/reset the signal mask in common_select(). This makes pselect()
work as required.
* Reorganized vfs_resize_fd_table().



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22391 a95241bf-73f2-0310-859d-f6bbb57e9c96

bonefish+axeld:
* Removed the vm_cache/vm_store ref_count duality that besides being a bit ugly
also created the page dameon cache retrieval problem: now, only areas (and
cache consumers) retrieve a reference to the store (and therefore, the vnode).
The page daemon doesn't need to care about this at all anymore, and the pseudo
references of the vm_cache could be removed again.
* Rearranged deletion of vnodes such that its ID can be reused directly after
fs_remove_vnode() has been called.
* vm_page_allocate_page() no longer panics when it runs out of pages, but just
waits for new pages to become available using the new sFreeCondition condition
variable - to make sure this happens in an acceptable time frame, it'll
trigger a run of the low memory handlers.
* Implemented a page_thief() that steals inactive pages from caches and puts
them into the free queue. It runs as a low memory handler.
* The file cache now sets the usage count on the pages it inserts into the
cache (needs some rework though, cache_io() doesn't do it yet).
* Instead of panicking, the kernel will currently dead lock in low memory
situations, since BFS does a bit too much in bfs_release_vnode().
* Some minor cleanup.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22315 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Merged vm_cache_ref and vm_cache to a single structure (Axel & Ingo).
* Renamed vm_cache.c to vm_cache.cpp


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@21642 a95241bf-73f2-0310-859d-f6bbb57e9c96

Got rid of vnode_id and mount_id, replaced with ino_t and dev_t.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@21485 a95241bf-73f2-0310-859d-f6bbb57e9c96

Use same figures as BeOS for soft and ahrd maximums on fd and mon tables (even though we don't use a table for mons).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20164 a95241bf-73f2-0310-859d-f6bbb57e9c96

Improved error reporting when a failure to find/mount the root device occurs.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@19774 a95241bf-73f2-0310-859d-f6bbb57e9c96

Implemented mandatory file locking, BeOS style. BNode::Lock() and BNode::Unlock()
are now working as expected.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@17697 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added a "reenter" parameter to the {read|write}_pages() functions to give file
systems a chance to know if they have locked already.
This fixes a locking problem in BFS where one thread tried to acquire two read
locks (where someone else trying to acquire a write lock would have caused a
dead lock).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@17108 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Factored out the vnode disconnection code from fs_unmount() to a separate
function, and added a vfs_disconnect_vnode() for other kernel components.
* devfs_unpublish_device() can now optionally make use of this call.
* Fixed the type check of devfs' unpublish_node().


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16907 a95241bf-73f2-0310-859d-f6bbb57e9c96

* get_vnode() did not decrease the sUnusedVnodes counter when taking one node
of that list.
* Added a vfs_free_unused_vnodes() function that calls the low memory handler
directly.
* create_sem_etc() now calls the above function in case there are no semaphores
available anymore; this usually frees up to 2 semaphores per node (one from
the cache if there is a file cache attached, and eventually one from the
file system).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16610 a95241bf-73f2-0310-859d-f6bbb57e9c96

fix a TODO in _user_mount : added an argsLength parameter


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16480 a95241bf-73f2-0310-859d-f6bbb57e9c96

Fixed bug #97:
* BEntry::Remove() now uses _kern_remove_dir() for directories.
* Added fd parameter to _kern_remove_dir().
* Fixed LibBeAdapter's _kern_unlink() to only work on files, and
added _kern_remove_dir() for directories.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16078 a95241bf-73f2-0310-859d-f6bbb57e9c96

Implemented a syscall to get information about the open file descriptors of all teams.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15991 a95241bf-73f2-0310-859d-f6bbb57e9c96

Moved vfs_bootstrap_file_systems() and vfs_mount_boot_file_system() out of vfs.cpp
and into its own file vfs_boot.cpp.

Added basic support for booting from CD - it doesn't give CDs a higher priority,
so you could end up booting from HD when you didn't explicetly select "CD-ROM"
in the boot loader. Eventually, it should only boot from HD in this case, if
booting from CD failed (because of a missing boot partition or whatever).

fs_mount(), _kern_mount(), and _user_mount() will now return the dev_t of the
mounted device, and not just B_OK. Maybe we should have fs_unmount() work on
a dev_t instead of a path as well...


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14403 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added kernel private VFS functions vfs_entry_ref_to_vnode() and vfs_vnode_to_node_ref().
Minor cleanup of vfs.h.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14314 a95241bf-73f2-0310-859d-f6bbb57e9c96

Our close-on-exec flag handling was broken: it's supposed to be specified per slot, not
per file descriptor (a descriptor can be shared among several slots). There is now a
second table in the io_context structure that contains that information in a bitmap.
There are now two new (private) functions to control the close-on-exec flag, fd_close_on_exec(),
and fd_set_close_on_exec().
F_DUPFD, dup(), and dup2() are supposed to clear the close-on-exec flag on the duplicated
slot - this fixes bug #57 (no output after a redirect of a shell builtin).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14313 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added vfs_get_cwd() call to get the mount_id and vnode_id of the current
working directory (instead of the full path).
Cleanup of some remaining "int" status variables (where it should have
been a "status_t").


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@13924 a95241bf-73f2-0310-859d-f6bbb57e9c96

vfs_get_vnode_cache() now only allocates a new cache if requested: this
prevents the system to allocate caches for files that don't use or have
a file cache (ie. only those can be mmap()ed!).
Therefore, cache_prefetch() no longer crashes when trying to prefetch
files without a file cache.
read_into_cache() no longer does anything if the requested size is 0.
Fixed a bug in cache_prefetch_vnode(): if the cache couldn't be retrieved,
it put the vnode, but didn't own it (the caller does).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@13904 a95241bf-73f2-0310-859d-f6bbb57e9c96

Renamed vfs_vnode_acquire_ref() to vnode_acquire_vnode().
Removed vfs_vnode_release_ref(), as vfs_put_vnode() already does the same thing.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@13867 a95241bf-73f2-0310-859d-f6bbb57e9c96

The term vnode_ptr is not used anywhere else; renamed vfs_put_vnode_ptr() to vfs_put_vnode().


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@13865 a95241bf-73f2-0310-859d-f6bbb57e9c96

Changed our read link syscall and FS interface call to make it easily possible to be POSIX compliant.
Also changed readlink() to be POSIX compliant with those changes.
"ls -l" does now resolve links properly again (the new coreutils version outlined the problems).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@12263 a95241bf-73f2-0310-859d-f6bbb57e9c96

Removed execute property that was set accidently (since CVS days).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@11896 a95241bf-73f2-0310-859d-f6bbb57e9c96

Fixed broken handling of the new file_descriptor::open_count across
team boundaries; if you didn't actually call close() from within the
application, the close-hook of the file system was never called.
Also, you could close files of other teams (ie. invoke close on a
shared file descriptor).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@11892 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added some more convenience VFS calls (vfs_stat_vnode(), and vfs_get_vnode_name()).
Removed *_create() and *_create_entry_ref() syscalls - they are now handled by
*_open() and *_open_entry_ref() calls which get another parameter for the permissions.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@11204 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Moved the autolocking code for recursive lockers to <util/AutoLock.h>.
* Added resolve_mount_point_to_volume_root() version for external use
(by the node monitor).


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@11159 a95241bf-73f2-0310-859d-f6bbb57e9c96

Renamed vfs_get_vnode() to vfs_lookup_vnode() as it doesn't grab a ref to the node.
Added new vfs_get_vnode() that actually grabs such a ref.
vfs_get_vnode_cache() now fills a vm_cache_ref instead of a void pointer.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10430 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added a query length parameter to _kern_open_query() - it's much easier to
do these things in userland.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10397 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added "flags" parameter to unmount.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10288 a95241bf-73f2-0310-859d-f6bbb57e9c96

vfs_mount_boot_file_system() now also gets the kernel_args.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9964 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added prototypes for readv/writev() syscalls.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9766 a95241bf-73f2-0310-859d-f6bbb57e9c96

Changed the last argument of _kern_mount() to be a string rather than a void pointer.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9691 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Added vfs_normalize_path() service call.
* Added resolve_mount_point_to_volume_root() which does what
resolve_volume_root_to_mount_point() did. IOW the latter one didn't
do what it advertised.
* Fixed dir_vnode_to_path(). Basically broken due to the broken
resolve_volume_root_to_mount_point(), but also compared potentially
unrelated vnode IDs (belonging to different volumes).
* Fixed get_dir_path_and_leaf(). It didn't deal correctly with paths
ending in '/' (including the root dir).
* fs_mount() does now accept a NULL fsName, getting the FS name from
the DDM in this case.
* fs_mount() now also supports mounting file images; it lets the DDM
create a file device for them.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9629 a95241bf-73f2-0310-859d-f6bbb57e9c96

_user_mount() now has a flags parameter, too.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9544 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added prototype for the new vfs_get_fs_node_from_path() function. It's
currently only used in devfs for the publication of partitions.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9533 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added exec() support function vfs_exec_io_context().


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9241 a95241bf-73f2-0310-859d-f6bbb57e9c96

New syscall for fcntl().


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9200 a95241bf-73f2-0310-859d-f6bbb57e9c96

Removed vfs_types.h - it's no longer needed.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9143 a95241bf-73f2-0310-859d-f6bbb57e9c96

notify_select_event moved to headers/os/drivers/Drivers.h where it belong


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9138 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added a "cookie" parameter to the vfs_read|write|has_page[s]().
Also added a prototype for the fs_get_file_map() fs call.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8867 a95241bf-73f2-0310-859d-f6bbb57e9c96

Changed the VM store and VFS functions a bit to better match the corresponding driver hooks.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8844 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added vfs_get_vnode() prototype.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8826 a95241bf-73f2-0310-859d-f6bbb57e9c96

Changed the way the vnode cache is set - it's now cleaner and can no longer
allocate a cache twice.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8815 a95241bf-73f2-0310-859d-f6bbb57e9c96

Several VFS related syscalls have been changed, added or removed.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8701 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added all syscalls needed for the next_dev() call.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8346 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added a syscall to get a path for a directory node_ref.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8278 a95241bf-73f2-0310-859d-f6bbb57e9c96

Moved vfs/fd _kern_*() calls to syscalls.h.
Removed some includes from syscalls.h where possible, minor style changes.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8256 a95241bf-73f2-0310-859d-f6bbb57e9c96

Renamed all VFS syscalls to the new style.
Improved returned types.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@7963 a95241bf-73f2-0310-859d-f6bbb57e9c96

Removed no longer used system call.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@7814 a95241bf-73f2-0310-859d-f6bbb57e9c96

Moved the public fs functions to fs_interface.h.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@7800 a95241bf-73f2-0310-859d-f6bbb57e9c96

Changed the "stat" related syscalls to have an additional parameter that specified
the size of the stat structure to allow extensions of that structure.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@7493 a95241bf-73f2-0310-859d-f6bbb57e9c96

Changed some return codes to status_t where appropriate.
Renamed vfs_bootstrap_all_filesystems() to vfs_bootstrap_file_systems().
Renamed vfs_register_filesystem() to vfs_register_file_system().
Added new call vfs_mount_boot_file_system().


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@7421 a95241bf-73f2-0310-859d-f6bbb57e9c96

We have status_t.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@6692 a95241bf-73f2-0310-859d-f6bbb57e9c96

list.h is now in util/.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@4594 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added the new vfs_get_module_path() call.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@4558 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added internal syscalls (_user/_kern) for fs_read_info() and fs_write_info().
Not yet accessible from the outside.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@4493 a95241bf-73f2-0310-859d-f6bbb57e9c96

Some header work: removed unnecessary dependencies to stage2.h, fixed
some broken C++ export definitions, added missing licenses etc.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@3152 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added a new call vfs_new_vnode(), replaced "int" return type to status_t
for the VFS vnode functions.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2785 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added kernel private node_monitor.h header.
Moved definition of "struct io_context" from fd.h to vfs.h.
Introduced new fs/ directory; some cleanups to come.
Added node monitor syscalls.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2479 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added a missing const to the (sys|user)_select() call.
Broke binary compatibility for the notify_select_event(), since it obviously
hasn't been used on R5 at all.
The new API/implementation is much nicer to use.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1830 a95241bf-73f2-0310-859d-f6bbb57e9c96

Adds support for select(), and poll() in the kernel - both are realized
using the current BeOS device API.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1745 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added syscalls for the index functions.
Corrected the prototype for fs_rewind_index_dir() (don't copy and paste...)
Also checked in the syscall definitions for the signal stuff to save Angelo
some work.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1562 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added a new write_stat() call to the file descriptor operations.
Renamed sys_read_stat() to sys_read_path_stat() - sys_read_stat() is now
the fd operation.
Removed the sys_write_attr_stat() call because it is no longer needed.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1554 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added prototypes for the sys_/user_ attribute calls.
Changed the file_descriptor structure (more status_t, name removed).
Changed "extern inline" to "static inline" in thread.h/arch_thread.h as those
also work with -O0 -g.
Added prototypes for [arch_cpu_]user_strlcpy().


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1454 a95241bf-73f2-0310-859d-f6bbb57e9c96

Renamed "calls" to "ops".
Removed unused prototype.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1179 a95241bf-73f2-0310-859d-f6bbb57e9c96

Renamed fs_id to mount_id.
Moved typedefs for mount_id and vnode_id to fs_interface.h.
Removed some unused stuff in ktypes.h.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1173 a95241bf-73f2-0310-859d-f6bbb57e9c96

The fs interface functions should now return a "status_t" rather than an "int".
Added syscalls for, and implemented sys_create_link(), sys_remove_dir().
Implemented link(), unlink(), rmdir().
Fixed the inconsistent path buffer handling in the user|sys vfs functions; the
path buffer is now exactly SYS_MAX_PATH_LEN from userland (incl. terminating
null byte).


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@748 a95241bf-73f2-0310-859d-f6bbb57e9c96

Implemented some more calls in unistd.h.
Replaced the unused syscall for getdtablesize() with one for access().
Implemented sys_access() and added it to the file system interface.
Removed the fs function interface from vfs.h.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@738 a95241bf-73f2-0310-859d-f6bbb57e9c96

Replaced opendir.c with directory.c, implemented chdir(), fchdir(), and
getcwd().
Introduced new xyz(int fd, char *path, ...) style of functions for
sys_setcwd(), and sys_write_stat().
Added missing sys_fstat(). Removed duplicated prototypes in syscalls.h
Fixed some minor bugs.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@669 a95241bf-73f2-0310-859d-f6bbb57e9c96

Changed argument order for sys_read/write() to be more intuitive.
Removed unistd.h (new BeOS-like unistd.h will be in posix/ shortly)


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@664 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added a comment in memheap.h
Added sys|user_write_link() to vfs.h


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@595 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added a sys_write_link() function.
Added a "mode" parameter to the sys_create_symlink() function.
Added an open_mode to the file_descriptor struct.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@591 a95241bf-73f2-0310-859d-f6bbb57e9c96

Big commit: Added symlink support to the kernel.
- added needed syscalls to access symlink support from userland
- implemented lstat(), symlink(), and readlink()
- added dev_t to ktypes.h (for now - should be in a public header anyway)
- added symlink support to the "ls" command (now calls lstat() and shows the
link target with the -l option)
- changed the sys_read_stat() call to support symlinks, and updated files
using that function (it gets an extra argument: bool traverseLink)


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@560 a95241bf-73f2-0310-859d-f6bbb57e9c96

Beginnings of the symbolic link support, though it's not yet working.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@507 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added the syscalls for sys_open_entry_ref(), sys_create_entry_ref(),
sys_open_dir_entry_ref(), sys_open_dir_node_ref(), sys_create_dir_entry_ref().


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@394 a95241bf-73f2-0310-859d-f6bbb57e9c96

Major code cleanup and reorganisation.
Fixed many bugs.
Now, the vfs_ prefix is for functions that are called by other parts of the
kernel. file_ is for file related stuff, dir_ for directory related, and
common_ for both, fs_ for general file system stuff.
Put all prefixed functions together in the source.
Implemented (currently without a user/sys call) opening/creating of entry_refs,
and node_refs (the latter for opening directories only).
Moved vfs_dup(), and vfs_dup2() to fd.c, fd_dup(), and fd_dup2().


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@351 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added a fs_get_vnode_name() call for the file systems.
Fixed a header dependency in sem.h.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@314 a95241bf-73f2-0310-859d-f6bbb57e9c96

user|sys_seek() now returns an off_t.
Changed the fd_close() call.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@267 a95241bf-73f2-0310-859d-f6bbb57e9c96

Next update of the VFS: more posix like open/create; divided create in
sys_create(), and sys_create_dir(), open in sys_open(), and sys_open_dir().
Small cleanups.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@207 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added the syscalls for sys_read_dir(), and sys_rewind_dir().
sys_read_dir() now has a parameter for the maximum number of dirents that
are handled by the upper layer - which is currently 1.
Added a comment in fd.h to ease the location of the sys|user prototypes
of the corresponding functions in fd.c.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@58 a95241bf-73f2-0310-859d-f6bbb57e9c96

It is accomplished ...


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10 a95241bf-73f2-0310-859d-f6bbb57e9c96

VFS: prevent FD inheritance for the kernel completely.

* Each io_context now has a "inherit_fds" member that decides whether
or not this context allows to inherit FDs to its children.
* This replaces the former O_CLOEXEC mechanism.

Make vfs_resize_fd_table() accessible in the kernel

Also update some types from int to uint32.

Fix _user_entry_ref_to_path() in chroot

* Add "bool kernel" parameter to vfs_entry_ref_to_path(), so it can be
specified for which I/O context the entry ref shall be translated.
* _user_entry_ref_to_path(): Use the calling team's I/O context instead
of the kernel's. Fixes the bug that in a chroot the syscall would
return a path for outside the chroot.

Changed argument type of fcntl syscall from uint32 to size_t.

Since this argument may be used to pass pointers, uint32 is not
correct for 64-bit. Effectively no change on 32-bit targets, both
size_t and uint32 are unsigned long there.

Add support for bind-mounting directories

* Add support function vfs_get_mount_point(), so a file system can get
its own mount point (i.e. the node it covers). Re-added
fs_mount::covers_vnode for that purpose -- the root node isn't know to
the VFS before the mount() hook returns.
* Add function vfs_bind_mount_directory() which bind-mounts a directory
to another. The Vnode::covers/covered_by mechanism is used, so this
isn't true bind-mounting, but sufficient for what we need ATM and
cheaper as well. The vnodes connected thus aren't tracked yet, which
is needed for undoing the connection when unmounting.
* get_vnode_name(): Don't use dir_read() to read the directory. Since we
have already resolved vnode to the covered vnode, we don't want the
dirents to be "fixed" to refer to the covering nodes. Such a vnode
simply wouldn't be found.

Add vfs_ prefix to resolve_vnode_to_covering_vnode()

Generalize use of Vnode::covered_by/covers

* Introduce Vnode flags for covered and covering. Can be used as a quick
check when one doesn't already hold sVnodeLock.
* Rename resolve_mount_point_to_volume_root() to
resolve_vnode_to_covering_vnode().
* Adjust all code that deals with transitions between mount points and
volume root vnodes to generally support covered/covering vnodes.

* Introduced new fs_lopen_attr_dir() function that opens the attribute
directory of a file without traversing leaf links (just like lstat()).
* Minor cleanup.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@42620 a95241bf-73f2-0310-859d-f6bbb57e9c96

Add support for bind-mounting directories

* Add support function vfs_get_mount_point(), so a file system can get
its own mount point (i.e. the node it covers). Re-added
fs_mount::covers_vnode for that purpose -- the root node isn't know to
the VFS before the mount() hook returns.
* Add function vfs_bind_mount_directory() which bind-mounts a directory
to another. The Vnode::covers/covered_by mechanism is used, so this
isn't true bind-mounting, but sufficient for what we need ATM and
cheaper as well. The vnodes connected thus aren't tracked yet, which
is needed for undoing the connection when unmounting.
* get_vnode_name(): Don't use dir_read() to read the directory. Since we
have already resolved vnode to the covered vnode, we don't want the
dirents to be "fixed" to refer to the covering nodes. Such a vnode
simply wouldn't be found.

Add vfs_ prefix to resolve_vnode_to_covering_vnode()

Generalize use of Vnode::covered_by/covers

* Introduce Vnode flags for covered and covering. Can be used as a quick
check when one doesn't already hold sVnodeLock.
* Rename resolve_mount_point_to_volume_root() to
resolve_vnode_to_covering_vnode().
* Adjust all code that deals with transitions between mount points and
volume root vnodes to generally support covered/covering vnodes.

* add implementation of bindfs, which can be used to bind-mount
a folder to some other place in the filesystem hierarchy
* add helper function to VFS that encapsulates the "conversion" of a
vnode-pointer to a fs_vnode-pointer (used by bindfs)

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40238 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Introduced type generic_io_vec, which is similar to iovec, but uses types
that are wide enough for both virtual and physical addresses.
* DMABuffer, IORequest, IOScheduler,... and code using them: Use
generic_io_vec and generic_{addr,size}_t where necessary.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@36997 a95241bf-73f2-0310-859d-f6bbb57e9c96

Changed the type of the "op" parameter of the fs_vnode_ops::ioctl() hook and
the _kern_ioctl() syscall from ulong to uint32.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@36927 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Introduced {malloc,memalign,free}_etc() which take an additional "flags"
argument. They replace the previous special-purpose allocation functions
(malloc_nogrow(), vip_io_request_malloc()).
* Moved the I/O VIP heap to heap.cpp accordingly.
* Added quite a bit of passing around of allocation flags in the VM,
particularly in the VM*AddressSpace classes.
* Fixed IOBuffer::GetNextVirtualVec(): It was ignoring the VIP flag and always
allocated on the normal heap.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35316 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Forgot to add linkat(), this really closes #4928 now.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34289 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Added missing AT_EACCESS.
* Implemented renameat(), faccessat(), fchownat(), fchmodat(), and mkfifoat().
* Added stub for mknodat().
* The kernel backend for faccessat() does not yet differentiate between
effective and real user/group IDs, though.
* Removed B_ENABLE_INCOMPLETE_POSIX_AT_SUPPORT, as we now support everything
(more or less). This also closes ticket #4928.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34288 a95241bf-73f2-0310-859d-f6bbb57e9c96

* load_image() now has exec() semantics wrt file descriptors; before each team
would always inherit them all, causing quite a number of open files.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34247 a95241bf-73f2-0310-859d-f6bbb57e9c96

* VFS:
- Fixed vfs_get_vnode_from_fd() return type.
- Added vfs_open_vnode().
- Added a "bool traverseLeafLink" parameter to vfs_get_fs_node_from_path().
It was always resolving symlinks.
* device manager/devfs:
- devfs: get_node_for_path() no longer resolves leaf symlinks. That still
doesn't help with file disk devices, as creating partition wouldn't work
anyway.
- Pulled the module-related implementation part of BaseDevice into new class
AbstractModuleDevice and made all methods of BaseDevice virtual. Small
adjustments to devfs to be happy with the new BaseDevice interface.
- Added BaseDevice subclass FileDevice, which maps the interface to a file's
file descriptor. Still got a few TODOs, but should basically work.
- Use FileDevice for publishing file disk devices in devfs. Now those do
actually work, though there's some BFS trouble with one of the images I
tested.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33385 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Introduced dedicated syscalls for the deprecated BeOS fs_attr API. Before,
each attribute access needed 3 syscalls, now only one as it should.
* Renamed the new Haiku call fs_open_attr() to fs_fopen_attr(), and added a new
function fs_open_attr() that takes a path (same semantics as the
fs_[f]open_attr_dir() functions already present in BeOS).
* Merged former _kern_open_attr(), and _kern_create_attr() into one syscall.
* Cleaned up vfs.h.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@31881 a95241bf-73f2-0310-859d-f6bbb57e9c96

axeld:
* Implemented a way to do asynchronous pre-fetching when mapping files.
* There are slight code duplications in some places that could benefit
from cleaning up, but nothing too bad.
* Implementing smarter ways to trigger prefetching and more analysis of
the situations in the kernel would be nice. Currently up to 10 MB
of every mapped file are pre-fetched without further analysis.
* The speed improvement is nice for certain operations. On our test
system (real hardware), Firefox took 9 seconds from being launched
to display a window. Now it takes 5 seconds. Both measurements
right after booting. The same system took 35 seconds from launching
Haiku in the GRUB menu to displaying the Tracker desktop background
image. Now it takes 27 seconds.
* We didn't have the chance to check out the effects of this on the
CD boot, but potentially, they could speed it up a lot.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@30465 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Introduced ref-counting for the I/O contexts.
* The I/O context related vfs_*() functions have io_context* instead of void*
parameters/return values, now.
* vfs_new_io_context(): Lock the parent I/O context before getting its table
size. Otherwise the table size could change until we do.
* vfs_resize_fd_table(): Fixed use of MutexLocker. We created only a temporary
object, not one with function scope.
* Renamed load_image_etc() to load_image_internal() and added a parameter for
specifying the parent team of the one to create.
* Introduced a kernel private load_image_etc() with a few more arguments than
load_image().


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29375 a95241bf-73f2-0310-859d-f6bbb57e9c96

* vfs_normalize_path() and _user_normalize_path() use a common helper
function (normalize_path()), now. There was some code duplication
before.
* Added "bool traverseLink" parameter to vfs_normalize_path(). When
true and the leaf component is a symlink, it will be resolved.
* KPath:
- Added similar leaf link traversal parameter to SetTo() and
SetPath().
- Added Normalize().
- Added DetachBuffer(), which returns the object's current buffer and
unsets itself.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27751 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added method vfs_asynchronous_write_pages(), which, unsurprisingly,
writes the given page iovecs asynchronously. The new class
AsyncIOCallback is used to inform the caller when the request has been
finished.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27055 a95241bf-73f2-0310-859d-f6bbb57e9c96

* It is now supported that I/O operations and requests are only handled
partially (e.g. due to hitting the end of file). The respective
classes have grown new methods and attributes to deal with that. The
"finished" callbacks have got additional parameters to indicate
whether the transfer was only partial and how much has been
transferred. Other callbacks and functions have a size_t* in/out
parameter instead of a simple size_t, now.
* vfs_{read,write}_pages() do now use the I/O request framework instead
of the underlying FS's {read,write}_pages() hooks (those should be
unused now). Furthermore they've got an additional "flags" parameter,
which is passed to IORequest::Init(), i.e. it allows to specify that
the given vecs refer to physical addresses.
* The file cache's read_into_cache() reads directly into physical
pages, now.
* Fixed bug in DoIO::IO(): The offset was not adjusted, so that all
pages were incorrectly transferred from/to the same location.
* Fixed broken subrequest scheduling loop head in
do_iterative_fd_io_iterate().
* Adjusted the test driver and implemented its io() hook. Using this
driver I/O requests are passed all the way from the VFS/VM to the
driver and through the I/O scheduler. It even seems to work. :-)
* Added missing const to the iovec* parameter of the IORequest::Init()
methods.
* Disabled some debug output by default. Added new optional debug
output.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26692 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added kernel private vfs_vnode_io() which performs an io_request on a
vnode (falling back to synchronous I/O if the io() is not supported).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26672 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Added FS interface hooks io() and cancel_io(). The former is supposed
to provide asynchrounous (or only synchronous, if asynchronous is not
supported) I/O request support. It will eventually replace
{read,write}_pages(). None of the FS implementations implement them
yet.
* Implemented some support functions for request-based I/O. File system
implementations can use do_fd_io() which passes an I/O request to the
layer responsible for a given FD, and do_iterative_fd_io(), which
translates a request for a file to subrequests for the underlying
device and passes them on. Both fall back to synchrounous processing
when the io() hook is not supported.
Furthermore added vfs_synchronous_io() which should be handy for the
devfs to perform io_requests synchronously for devices that don't
support the io() hook.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26655 a95241bf-73f2-0310-859d-f6bbb57e9c96

* bfs_fsync() was the only place which could cause the
fs_vnode_ops::write_pages() to be called with fsReenter = true. Since
this is no longer the case, the argument has become superfluous. For
read_pages() it always was. Removed the argument from the functions
and all functions that propagated it.
* Some whitespace at the end of lines was removed.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26579 a95241bf-73f2-0310-859d-f6bbb57e9c96

Merged branch haiku/branches/developer/bonefish/vm into trunk. This
introduces the following relevant changes:
* VMCache:
- Renamed vm_cache to VMCache, merged it with vm_store and made it a
C++ class with virtual methods (replacing the store operations).
Turned the different store implementations into subclasses.
- Introduced MergeStore() callback, changed semantics of Commit().
- Changed locking and referencing semantics. A reference can only be
acquired/released with the cache locked. An unreferenced cache is
deleted and a mergeable cache merged when it is unlocked. This
removes the "busy" state of a cache and simplifies the page fault
code.
* Added VMAnonymousCache, which will implement swap support (work by
Zhao Shuai). It is not integrated and used yet, though.
* Enabled the mutex/recursive lock holder asserts.
* Fixed DoublyLinkedList::Swap().
* Generalized the low memory handler to a low resource handler. And made
semaphores and reserved memory handled resources. Made
vm_try_resource_memory() optionally wait (with timeout), and used that
feature to reserve memory for areas.
...


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26572 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Introduced new header directory headers/private/system which is supposed
to contain headers shared by kernel and userland (mainly libroot).
* Moved quite a few private kernel headers to the new location. Split
several kernel headers into a shared part and one that is still kernel
private. Adjusted all affected Jamfiles and source in the standard x86
build accordingly. The build for other architectures and for test code
may be broken.
* Quite a bit of userland code still includes private kernel headers.
Mostly those are <util/*> headers. The ones that aren't strictly
kernel-only should be moved to some other place (maybe
headers/private/shared/util).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25486 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Changed the way the socket functions work:
- The net_stack driver is no longer used. Instead we have a kernel
module which is directly used by syscall implementations in the
kernel. I.e. we no longer tunnel those functions through ioctls, but
have normal syscalls.
- Removed the superfluous net starter module.
- Implemented the FDTYPE_SOCKET type file_descriptors, that is sockets
are no longer vnode based.
- Adjusted libnetwork (the socket function implementations)
accordingly.
- Adjusted netstat accordingly.
* Socket module:
- Implemented socketpair().
- Added "kernel" parameter to the control hook. Quite a few more hooks
would actually need the parameter, but I didn't change those yet,
since that would probably also require changes to the protocol
module interface.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24908 a95241bf-73f2-0310-859d-f6bbb57e9c96

New service function vfs_create_special_node() to create special nodes.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24883 a95241bf-73f2-0310-859d-f6bbb57e9c96

Rename vfs_stat_entry_ref() to vfs_stat_node_ref() as that's what a dev_t and
ino_t combination really is.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24825 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Added _kern_create_pipe() syscall, creating a pipe as an entryless
FIFO. Reimplemented pipe() to use it.
* pipefs is no longer mounted. Will remove the superfluous code soon.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24823 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Reorganized the FS interface a little:
- Moved most file_system_module_info hooks into separate structures.
Those that operate on mounted volumes to fs_volume_ops, those
operating on a vnode to fs_vnode_ops.
- Got rid of the fs_volume, fs_cookie, fs_vnode typedefs. We use void*
again.
- Instead of a void* volume and node cookie hooks are passed a
fs_volume and fs_vnode structure pointer, which contain the cookie
and an ops pointer (fs_volume a few more things).
- The VFS {new,publish,get,...}_vnode() functions take a fs_volume*
instead of the volume ID. So does vfs_get_fs_node_from_path().
- Added type and flags arguments to publish_vnode() and the
get_vnode() hook and removed the type argument from lookup() hook.
Added vnode::type using formerly unused bits to store the node type.
Simplified a few things in the VFS due to the now always available
node type.
- Added fs_volume_ops::{create,delete}_sub_vnode() and
fs_vnode_ops::get_super_vnode() hooks. They are used to support file
system layers, e.g. allowing to extend an FS not supporting BeOS
attribute with attribute support. Needs some more work in the VFS.
- Added fs_vnode_ops::create_special_node() hook for creating special
nodes (e.g. FIFOs).
* Adjusted the built-in file systems and BFS according to the interface
changes. Removed all other FSs from the image for the time being.
We'll see whether further API changes are necessary before porting
them.
* Adjusted the bfs_shell accordingly.
* Implemented create_special_node() in rootfs to support special nodes.
* Added support for FIFOs:
- Added syscall _kern_create_fifo() (used by mkfifo()), which creates
a special node (type S_IFIFO) in the respective file system.
- When a special node is published the VFS creates a respective sub
node. Currently only FIFOs are supported.
- Added a little support for FIFO subnodes by using functionality from
the pipefs.
- Added mkfifo to the image. It can create FIFOs in the rootfs, but
the FIFOs aren't really usable ATM, since they still work like
pipes, i.e. readers and writers need to have them open at the same
time.
* Some smaller changes in the VFS:
- Made the *_CALL macros nicer to use (vargs).
- Refactored FS entry lookup into new function lookup_dir_entry().
- create_vnode() no longer just calls the FS create() hook. First it
looks up the entry and uses open_vnode(), if it already exists. This
is necessary for two reasons: 1) The FS might not support create()
while still allowing to open() entries. 2) When the FS has other
layers on to of it (or the respective node) it might not be
responsible for opening the node.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24816 a95241bf-73f2-0310-859d-f6bbb57e9c96

Introduce vfs_stat_entry_ref() that allows to stat a vnode based on a dev_t
and ino_t instead of a path. Supposed to work with node monitoring messages.
Took the name from vfs_entry_ref_to_path() that takes the same arguments, but
suggestions for a better name are welcome.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24813 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Implemented support for chroot:
- Added a "root" vnode to the io_context. It is used for resolving
paths and converting nodes to paths instead of sRoot. Some more
passing around of io_context structures was necessary.
- Introduced a new lock sIOContextRootLock to protect
io_context::root. The current uses of io_context::io_mutex
(put_vnode(), remove_vnode() while holding it) looked too suspicious
to use that mutex in vnode_path_to_vnode().
- Added _kern_change_root() syscall and chroot() libroot function.
- Added chroot coreutils program to the image. Funnily it seems to be
much easier to set up a little jail than under Linux (just copy
bash and libroot.so into respective subdirs; mount another pipefs
if you want pipe support).
With Haiku allowing direct access to directories via inode IDs
jailing is obviously not very secure at the moment.
- Added /var/empty to the image. It will be the chroot target for ssh.
* Changed vfs.cpp:get_cwd() so that the io_context::io_mutex is no
longer held when calling dir_vnode_to_path().


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24673 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added function vfs_read_stat() that also allows for stat()ing files in
the user IO context from within the kernel.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24667 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Factored a vfs_entry_ref_to_path() out of _user_entry_ref_to_path()
and made it public (within the kernel).
* _user_entry_ref_to_path() is now using that function.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24151 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added new syscall _kern_normalize_path() to normalize a path.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23929 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Implemented flock() semantics to the advisory locking backend. Not tested
(must also compare to BSD; I've looked at their sources, but I might have
missed something).
* Added sys/file.h and the flock() system call.
* common_fcntl() could forget to put back the file descriptor on some error
conditions (I guess we should introduce and use a DescriptorGetter class).
* Cleaned up fcntl.h, moved the BSD extensions S_IREAD and S_IWRITE to
sys/stat.h where they belong, and added the missing S_IEXEC to them.
* Added some more comments.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23836 a95241bf-73f2-0310-859d-f6bbb57e9c96

axeld + bonefish: Missed those changes in the previous commit:
* Added vfs_unmount(), which allows unmounting by dev_t (used by the DDM).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22910 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Extracted file_map API out of the file cache - it's now an optional service
that can be used by file systems.
* Changed the way the file cache works: instead of reading/writing to the
underlying device directly, it can now be used for any data source, ie.
also network file systems.
* As a result, the former pages_io() moved to the VFS layer, and can now be
called by a file system via {read|write}_file_io_vec_pages() (naming
suggestions are always welcomed :-)). It now gets an FD, and uses that to
communicate with the device (via its fs_{read|write}_pages() hooks).
* The file_cache_{read|write}() functions must now be called without holding
an I/O relevant file system lock. That allows the file cache to prepare the
pages without colliding with the page writer, IOW the "mayBlock" flag can
go into the attic again (yay!).
* This also results in a much better performance when the system does I/O and
is low on memory, as the page writer can now finally write back some pages,
and that even without maxing out the CPU :)
* The API changes put slightly more burden on the fs_{read|write}_pages()
hooks, but in combination with the file_map it's still pretty straight
forward. It just will have to dispatch the call to the underlying device
directly, usually it will just call its fs_{read|write}_pages() hooks
via the above mentioned calls.
* Ported BFS and FAT to the new API, the latter has not been tested, though.
* Also ported the API changes to the fs_shell. I also completely removed its
file cache level page handling - the downside is that device access is no
longer cached (ie. depends on the host OS now), the upside is that the code
is greatly simplified.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22886 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Added a "canWait" argument to vfs_get_vnode() - you can use this to ignore
busy vnodes.
* dir_create_entry_ref() used get_vnode() incorrectly (and could therefore
potentially prevent a file system from doing proper locking when called
from the kernel).
* The vnode_store now uses this for its acquire_unreferenced_ref()
implementation (and therefore for the page writer).
* read_into_cache() and write_to_cache() were still marked inline.
* The system will now wait 10 secs for a busy vnode before returning an error.
* It will also no longer panic in that case.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22485 a95241bf-73f2-0310-859d-f6bbb57e9c96

* struct vnode is an opaque type now, removed void* where it was used incorrectly.
* Minor cleanup.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22461 a95241bf-73f2-0310-859d-f6bbb57e9c96

* fs_{write|read}_pages() now has an additional argument "mayBlock".
* the page writer don't allow to block, while all other writers do. This fixes
bug #1509. The reason the page writer needs this is because it marks several
pages from different caches as busy.
* Fixed a warning about ASSERT being defined already in BFS, since
util/DoublyLinkedList.h now includes debug.h.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22434 a95241bf-73f2-0310-859d-f6bbb57e9c96

* fd.c -> fd.cpp
* Reworked the select support:
- The io_context additionally stores a table of lists of select_infos,
which enables it to deselect events of a pending select() when
closing a FD. This prevents a race condition potentially causing a
write to stale memory.
- The opaque selectsync* passed to FSs is now actually a select_info*.
This was necessary, since the FDs deselect() hook (unlike the
select() hook) doesn't take a "ref" argument and deselecting a
single info (e.g. caused by a premature close()) was not possible.
The select() hook's "ref" argument has become superfluous.
- It should now be relatively easy to implement a poll_on_steroids()
that can also wait for objects other than FDs (e.g. semaphores,
ports, threads etc.).
* Set/reset the signal mask in common_select(). This makes pselect()
work as required.
* Reorganized vfs_resize_fd_table().



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22391 a95241bf-73f2-0310-859d-f6bbb57e9c96

bonefish+axeld:
* Removed the vm_cache/vm_store ref_count duality that besides being a bit ugly
also created the page dameon cache retrieval problem: now, only areas (and
cache consumers) retrieve a reference to the store (and therefore, the vnode).
The page daemon doesn't need to care about this at all anymore, and the pseudo
references of the vm_cache could be removed again.
* Rearranged deletion of vnodes such that its ID can be reused directly after
fs_remove_vnode() has been called.
* vm_page_allocate_page() no longer panics when it runs out of pages, but just
waits for new pages to become available using the new sFreeCondition condition
variable - to make sure this happens in an acceptable time frame, it'll
trigger a run of the low memory handlers.
* Implemented a page_thief() that steals inactive pages from caches and puts
them into the free queue. It runs as a low memory handler.
* The file cache now sets the usage count on the pages it inserts into the
cache (needs some rework though, cache_io() doesn't do it yet).
* Instead of panicking, the kernel will currently dead lock in low memory
situations, since BFS does a bit too much in bfs_release_vnode().
* Some minor cleanup.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22315 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Merged vm_cache_ref and vm_cache to a single structure (Axel & Ingo).
* Renamed vm_cache.c to vm_cache.cpp


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@21642 a95241bf-73f2-0310-859d-f6bbb57e9c96

Got rid of vnode_id and mount_id, replaced with ino_t and dev_t.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@21485 a95241bf-73f2-0310-859d-f6bbb57e9c96

Use same figures as BeOS for soft and ahrd maximums on fd and mon tables (even though we don't use a table for mons).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20164 a95241bf-73f2-0310-859d-f6bbb57e9c96

Improved error reporting when a failure to find/mount the root device occurs.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@19774 a95241bf-73f2-0310-859d-f6bbb57e9c96

Implemented mandatory file locking, BeOS style. BNode::Lock() and BNode::Unlock()
are now working as expected.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@17697 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added a "reenter" parameter to the {read|write}_pages() functions to give file
systems a chance to know if they have locked already.
This fixes a locking problem in BFS where one thread tried to acquire two read
locks (where someone else trying to acquire a write lock would have caused a
dead lock).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@17108 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Factored out the vnode disconnection code from fs_unmount() to a separate
function, and added a vfs_disconnect_vnode() for other kernel components.
* devfs_unpublish_device() can now optionally make use of this call.
* Fixed the type check of devfs' unpublish_node().


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16907 a95241bf-73f2-0310-859d-f6bbb57e9c96

* get_vnode() did not decrease the sUnusedVnodes counter when taking one node
of that list.
* Added a vfs_free_unused_vnodes() function that calls the low memory handler
directly.
* create_sem_etc() now calls the above function in case there are no semaphores
available anymore; this usually frees up to 2 semaphores per node (one from
the cache if there is a file cache attached, and eventually one from the
file system).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16610 a95241bf-73f2-0310-859d-f6bbb57e9c96

fix a TODO in _user_mount : added an argsLength parameter


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16480 a95241bf-73f2-0310-859d-f6bbb57e9c96

Fixed bug #97:
* BEntry::Remove() now uses _kern_remove_dir() for directories.
* Added fd parameter to _kern_remove_dir().
* Fixed LibBeAdapter's _kern_unlink() to only work on files, and
added _kern_remove_dir() for directories.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16078 a95241bf-73f2-0310-859d-f6bbb57e9c96

Implemented a syscall to get information about the open file descriptors of all teams.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15991 a95241bf-73f2-0310-859d-f6bbb57e9c96

Moved vfs_bootstrap_file_systems() and vfs_mount_boot_file_system() out of vfs.cpp
and into its own file vfs_boot.cpp.

Added basic support for booting from CD - it doesn't give CDs a higher priority,
so you could end up booting from HD when you didn't explicetly select "CD-ROM"
in the boot loader. Eventually, it should only boot from HD in this case, if
booting from CD failed (because of a missing boot partition or whatever).

fs_mount(), _kern_mount(), and _user_mount() will now return the dev_t of the
mounted device, and not just B_OK. Maybe we should have fs_unmount() work on
a dev_t instead of a path as well...


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14403 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added kernel private VFS functions vfs_entry_ref_to_vnode() and vfs_vnode_to_node_ref().
Minor cleanup of vfs.h.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14314 a95241bf-73f2-0310-859d-f6bbb57e9c96

Our close-on-exec flag handling was broken: it's supposed to be specified per slot, not
per file descriptor (a descriptor can be shared among several slots). There is now a
second table in the io_context structure that contains that information in a bitmap.
There are now two new (private) functions to control the close-on-exec flag, fd_close_on_exec(),
and fd_set_close_on_exec().
F_DUPFD, dup(), and dup2() are supposed to clear the close-on-exec flag on the duplicated
slot - this fixes bug #57 (no output after a redirect of a shell builtin).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14313 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added vfs_get_cwd() call to get the mount_id and vnode_id of the current
working directory (instead of the full path).
Cleanup of some remaining "int" status variables (where it should have
been a "status_t").


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@13924 a95241bf-73f2-0310-859d-f6bbb57e9c96

vfs_get_vnode_cache() now only allocates a new cache if requested: this
prevents the system to allocate caches for files that don't use or have
a file cache (ie. only those can be mmap()ed!).
Therefore, cache_prefetch() no longer crashes when trying to prefetch
files without a file cache.
read_into_cache() no longer does anything if the requested size is 0.
Fixed a bug in cache_prefetch_vnode(): if the cache couldn't be retrieved,
it put the vnode, but didn't own it (the caller does).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@13904 a95241bf-73f2-0310-859d-f6bbb57e9c96

Renamed vfs_vnode_acquire_ref() to vnode_acquire_vnode().
Removed vfs_vnode_release_ref(), as vfs_put_vnode() already does the same thing.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@13867 a95241bf-73f2-0310-859d-f6bbb57e9c96

The term vnode_ptr is not used anywhere else; renamed vfs_put_vnode_ptr() to vfs_put_vnode().


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@13865 a95241bf-73f2-0310-859d-f6bbb57e9c96

Changed our read link syscall and FS interface call to make it easily possible to be POSIX compliant.
Also changed readlink() to be POSIX compliant with those changes.
"ls -l" does now resolve links properly again (the new coreutils version outlined the problems).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@12263 a95241bf-73f2-0310-859d-f6bbb57e9c96

Removed execute property that was set accidently (since CVS days).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@11896 a95241bf-73f2-0310-859d-f6bbb57e9c96

Fixed broken handling of the new file_descriptor::open_count across
team boundaries; if you didn't actually call close() from within the
application, the close-hook of the file system was never called.
Also, you could close files of other teams (ie. invoke close on a
shared file descriptor).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@11892 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added some more convenience VFS calls (vfs_stat_vnode(), and vfs_get_vnode_name()).
Removed *_create() and *_create_entry_ref() syscalls - they are now handled by
*_open() and *_open_entry_ref() calls which get another parameter for the permissions.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@11204 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Moved the autolocking code for recursive lockers to <util/AutoLock.h>.
* Added resolve_mount_point_to_volume_root() version for external use
(by the node monitor).


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@11159 a95241bf-73f2-0310-859d-f6bbb57e9c96

Renamed vfs_get_vnode() to vfs_lookup_vnode() as it doesn't grab a ref to the node.
Added new vfs_get_vnode() that actually grabs such a ref.
vfs_get_vnode_cache() now fills a vm_cache_ref instead of a void pointer.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10430 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added a query length parameter to _kern_open_query() - it's much easier to
do these things in userland.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10397 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added "flags" parameter to unmount.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10288 a95241bf-73f2-0310-859d-f6bbb57e9c96

vfs_mount_boot_file_system() now also gets the kernel_args.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9964 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added prototypes for readv/writev() syscalls.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9766 a95241bf-73f2-0310-859d-f6bbb57e9c96

Changed the last argument of _kern_mount() to be a string rather than a void pointer.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9691 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Added vfs_normalize_path() service call.
* Added resolve_mount_point_to_volume_root() which does what
resolve_volume_root_to_mount_point() did. IOW the latter one didn't
do what it advertised.
* Fixed dir_vnode_to_path(). Basically broken due to the broken
resolve_volume_root_to_mount_point(), but also compared potentially
unrelated vnode IDs (belonging to different volumes).
* Fixed get_dir_path_and_leaf(). It didn't deal correctly with paths
ending in '/' (including the root dir).
* fs_mount() does now accept a NULL fsName, getting the FS name from
the DDM in this case.
* fs_mount() now also supports mounting file images; it lets the DDM
create a file device for them.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9629 a95241bf-73f2-0310-859d-f6bbb57e9c96

_user_mount() now has a flags parameter, too.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9544 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added prototype for the new vfs_get_fs_node_from_path() function. It's
currently only used in devfs for the publication of partitions.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9533 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added exec() support function vfs_exec_io_context().


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9241 a95241bf-73f2-0310-859d-f6bbb57e9c96

New syscall for fcntl().


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9200 a95241bf-73f2-0310-859d-f6bbb57e9c96

Removed vfs_types.h - it's no longer needed.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9143 a95241bf-73f2-0310-859d-f6bbb57e9c96

notify_select_event moved to headers/os/drivers/Drivers.h where it belong


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9138 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added a "cookie" parameter to the vfs_read|write|has_page[s]().
Also added a prototype for the fs_get_file_map() fs call.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8867 a95241bf-73f2-0310-859d-f6bbb57e9c96

Changed the VM store and VFS functions a bit to better match the corresponding driver hooks.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8844 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added vfs_get_vnode() prototype.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8826 a95241bf-73f2-0310-859d-f6bbb57e9c96

Changed the way the vnode cache is set - it's now cleaner and can no longer
allocate a cache twice.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8815 a95241bf-73f2-0310-859d-f6bbb57e9c96

Several VFS related syscalls have been changed, added or removed.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8701 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added all syscalls needed for the next_dev() call.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8346 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added a syscall to get a path for a directory node_ref.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8278 a95241bf-73f2-0310-859d-f6bbb57e9c96

Moved vfs/fd _kern_*() calls to syscalls.h.
Removed some includes from syscalls.h where possible, minor style changes.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8256 a95241bf-73f2-0310-859d-f6bbb57e9c96

Renamed all VFS syscalls to the new style.
Improved returned types.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@7963 a95241bf-73f2-0310-859d-f6bbb57e9c96

Removed no longer used system call.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@7814 a95241bf-73f2-0310-859d-f6bbb57e9c96

Moved the public fs functions to fs_interface.h.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@7800 a95241bf-73f2-0310-859d-f6bbb57e9c96

Changed the "stat" related syscalls to have an additional parameter that specified
the size of the stat structure to allow extensions of that structure.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@7493 a95241bf-73f2-0310-859d-f6bbb57e9c96

Changed some return codes to status_t where appropriate.
Renamed vfs_bootstrap_all_filesystems() to vfs_bootstrap_file_systems().
Renamed vfs_register_filesystem() to vfs_register_file_system().
Added new call vfs_mount_boot_file_system().


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@7421 a95241bf-73f2-0310-859d-f6bbb57e9c96

We have status_t.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@6692 a95241bf-73f2-0310-859d-f6bbb57e9c96

list.h is now in util/.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@4594 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added the new vfs_get_module_path() call.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@4558 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added internal syscalls (_user/_kern) for fs_read_info() and fs_write_info().
Not yet accessible from the outside.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@4493 a95241bf-73f2-0310-859d-f6bbb57e9c96

Some header work: removed unnecessary dependencies to stage2.h, fixed
some broken C++ export definitions, added missing licenses etc.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@3152 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added a new call vfs_new_vnode(), replaced "int" return type to status_t
for the VFS vnode functions.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2785 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added kernel private node_monitor.h header.
Moved definition of "struct io_context" from fd.h to vfs.h.
Introduced new fs/ directory; some cleanups to come.
Added node monitor syscalls.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2479 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added a missing const to the (sys|user)_select() call.
Broke binary compatibility for the notify_select_event(), since it obviously
hasn't been used on R5 at all.
The new API/implementation is much nicer to use.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1830 a95241bf-73f2-0310-859d-f6bbb57e9c96

Adds support for select(), and poll() in the kernel - both are realized
using the current BeOS device API.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1745 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added syscalls for the index functions.
Corrected the prototype for fs_rewind_index_dir() (don't copy and paste...)
Also checked in the syscall definitions for the signal stuff to save Angelo
some work.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1562 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added a new write_stat() call to the file descriptor operations.
Renamed sys_read_stat() to sys_read_path_stat() - sys_read_stat() is now
the fd operation.
Removed the sys_write_attr_stat() call because it is no longer needed.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1554 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added prototypes for the sys_/user_ attribute calls.
Changed the file_descriptor structure (more status_t, name removed).
Changed "extern inline" to "static inline" in thread.h/arch_thread.h as those
also work with -O0 -g.
Added prototypes for [arch_cpu_]user_strlcpy().


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1454 a95241bf-73f2-0310-859d-f6bbb57e9c96

Renamed "calls" to "ops".
Removed unused prototype.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1179 a95241bf-73f2-0310-859d-f6bbb57e9c96

Renamed fs_id to mount_id.
Moved typedefs for mount_id and vnode_id to fs_interface.h.
Removed some unused stuff in ktypes.h.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1173 a95241bf-73f2-0310-859d-f6bbb57e9c96

The fs interface functions should now return a "status_t" rather than an "int".
Added syscalls for, and implemented sys_create_link(), sys_remove_dir().
Implemented link(), unlink(), rmdir().
Fixed the inconsistent path buffer handling in the user|sys vfs functions; the
path buffer is now exactly SYS_MAX_PATH_LEN from userland (incl. terminating
null byte).


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@748 a95241bf-73f2-0310-859d-f6bbb57e9c96

Implemented some more calls in unistd.h.
Replaced the unused syscall for getdtablesize() with one for access().
Implemented sys_access() and added it to the file system interface.
Removed the fs function interface from vfs.h.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@738 a95241bf-73f2-0310-859d-f6bbb57e9c96

Replaced opendir.c with directory.c, implemented chdir(), fchdir(), and
getcwd().
Introduced new xyz(int fd, char *path, ...) style of functions for
sys_setcwd(), and sys_write_stat().
Added missing sys_fstat(). Removed duplicated prototypes in syscalls.h
Fixed some minor bugs.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@669 a95241bf-73f2-0310-859d-f6bbb57e9c96

Changed argument order for sys_read/write() to be more intuitive.
Removed unistd.h (new BeOS-like unistd.h will be in posix/ shortly)


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@664 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added a comment in memheap.h
Added sys|user_write_link() to vfs.h


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@595 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added a sys_write_link() function.
Added a "mode" parameter to the sys_create_symlink() function.
Added an open_mode to the file_descriptor struct.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@591 a95241bf-73f2-0310-859d-f6bbb57e9c96

Big commit: Added symlink support to the kernel.
- added needed syscalls to access symlink support from userland
- implemented lstat(), symlink(), and readlink()
- added dev_t to ktypes.h (for now - should be in a public header anyway)
- added symlink support to the "ls" command (now calls lstat() and shows the
link target with the -l option)
- changed the sys_read_stat() call to support symlinks, and updated files
using that function (it gets an extra argument: bool traverseLink)


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@560 a95241bf-73f2-0310-859d-f6bbb57e9c96

Beginnings of the symbolic link support, though it's not yet working.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@507 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added the syscalls for sys_open_entry_ref(), sys_create_entry_ref(),
sys_open_dir_entry_ref(), sys_open_dir_node_ref(), sys_create_dir_entry_ref().


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@394 a95241bf-73f2-0310-859d-f6bbb57e9c96

Major code cleanup and reorganisation.
Fixed many bugs.
Now, the vfs_ prefix is for functions that are called by other parts of the
kernel. file_ is for file related stuff, dir_ for directory related, and
common_ for both, fs_ for general file system stuff.
Put all prefixed functions together in the source.
Implemented (currently without a user/sys call) opening/creating of entry_refs,
and node_refs (the latter for opening directories only).
Moved vfs_dup(), and vfs_dup2() to fd.c, fd_dup(), and fd_dup2().


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@351 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added a fs_get_vnode_name() call for the file systems.
Fixed a header dependency in sem.h.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@314 a95241bf-73f2-0310-859d-f6bbb57e9c96

user|sys_seek() now returns an off_t.
Changed the fd_close() call.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@267 a95241bf-73f2-0310-859d-f6bbb57e9c96

Next update of the VFS: more posix like open/create; divided create in
sys_create(), and sys_create_dir(), open in sys_open(), and sys_open_dir().
Small cleanups.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@207 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added the syscalls for sys_read_dir(), and sys_rewind_dir().
sys_read_dir() now has a parameter for the maximum number of dirents that
are handled by the upper layer - which is currently 1.
Added a comment in fd.h to ease the location of the sys|user prototypes
of the corresponding functions in fd.c.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@58 a95241bf-73f2-0310-859d-f6bbb57e9c96

It is accomplished ...


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10 a95241bf-73f2-0310-859d-f6bbb57e9c96