- allow mounting with "none" block device
- allow unmounting by mountpoint
- make VFS aware of file system process labels
- allow m3_ca1 to use the full available message size
- use *printf in u/mount(1), as mount(2) uses it already
- fix reference leaks for some mount error cases in VFS
- clean up kernel section of minix/com.h somewhat
- remove ALLOCMEM and VM_ALLOCMEM calls
- remove non-safecopy and minix-vmd support from Inet
- remove SYS_VIRVCOPY and SYS_PHYSVCOPY calls
- remove obsolete segment encoding in SYS_SAFECOPY*
- remove DEVCTL call, svrctl(FSDEVUNMAP), map_driverX
- remove declarations of unimplemented svrctl requests
- remove everything related to swapping to disk
- remove floppysetup.sh
- remove traces of rescue device
- update DESCRIBE.sh with new devices
- some other small changes
- Revise VFS-FS protocol and update VFS/MFS/ISOFS accordingly.
- Clean up MFS by removing old, dead code (backwards compatibility is broken by
the new VFS-FS protocol, anyway) and rewrite other parts. Also, make sure all
functions have proper banners and prototypes.
- VFS should always provide a (syntactically) valid path to the FS; no need for
the FS to do sanity checks when leaving/entering mount points.
- Fix several bugs in MFS:
- Several path lookup bugs in MFS.
- A link can be too big for the path buffer.
- A mountpoint can become inaccessible when the creation of a new inode
fails, because the inode already exists and is a mountpoint.
- Introduce support for supplemental groups.
- Add test 46 to test supplemental group functionality (and removed obsolete
suppl. tests from test 2).
- Clean up VFS (not everything is done yet).
- ISOFS now opens device read-only. This makes the -r flag in the mount command
unnecessary (but will still report to be mounted read-write).
- Introduce PipeFS. PipeFS is a new FS that handles all anonymous and
named pipes. However, named pipes still reside on the (M)FS, as they are part
of the file system on disk. To make this work VFS now has a concept of
'mapped' inodes, which causes read, write, truncate and stat requests to be
redirected to the mapped FS, and all other requests to the original FS.
- all macros in consts.h that depend on NR_TASKS replaced by a FP_BLOCKED_ON_*
- fp_suspended removed and replaced by fp_blocked_on. Testing whether a process
is supended is qeual to testing whether fp_blocked_on is FP_BLOCKED_ON_NONE or
not
- fp_task is valid only if fp_blocked_on == FP_BLOCKED_ON_OTHER
- no need of special values that do not colide with valid and special endpoints
since they are not used as endpoints anymore
- suspend only takes FP_BLOCKED_ON_* values not endpoints anymore
- suspend(task) replaced by wait_for(task) which sets fp_task so we remember who
are we waiting for and suspend sets fp_blocked_on to FP_BLOCKED_ON_OTHER to
signal that we are waiting for some other process
- some functions should take endpoint_t instead of int, fixed
POSIX compliance.
VFS changes:
* truncate() on a file system mounted read-only no longer panics MFS.
* ftruncate() and fcntl(F_FREESP) now check for write permission on
the file descriptor instead of the file, write().
* utime(), chown() and fchown() now check for file system read-only
status.
MFS changes:
* link() and rename() no longer return the internal EENTERMOUNT and
ELEAVEMOUNT errors to the application as part of a check on the
source path.
* rename() now treats EENTERMOUNT from the destination path check as
an error, preventing file system corruption from renaming a normal
directory to an existing mountpoint directory.
* mountpoints (mounted-on dirs) are hidden better during lookups:
- if a lookup starts from a mountpoint, the first component has to
be ".." (anything else being a VFS-FS protocol violation).
- in that case, the permissions of the mountpoint are not checked.
- in all other cases, visiting a mountpoint always results in
EENTERMOUNT.
* a lookup on ".." from a mount root or chroot(2) root no longer
succeeds if the caller does not have search permission on that
directory.
* POSIX: getdents() now updates directory access times.
* POSIX: readlink() now returns partial results instead of ERANGE.
Miscellaneous changes:
* semaphore file handling bug (leading to hangs) fixed in test 32.
The VFS changes should now put the burden of checking for read-only
status of file systems entirely on VFS, and limit the access
permission checks that file systems have to perform, to checking
search permission on directories during lookups. From this point on,
any deviation from that spceification should be considered a bug.
Note that for legacy reasons, the root partition is assumed to be
mounted read-write.
if the process was REVIVING. (susp_count doesn't count those
processes.) this together with dev_io SELECT suspend side effect
for asynch. character devices solves the hanging pipe bug. or
at last vastly improves it.
added sanity checks, turned off by default.
made the {NOT_,}{SUSPENDING,REVIVING} constants weirder to
help sanity checking.
now used for printing diagnostic messages through the kernel message
buffer. this lets processes print diagnostics without sending messages
to tty and log directly, simplifying the message protocol a lot and
reducing difficulties with deadlocks and other situations in which
diagnostics are blackholed (e.g. grants don't work). this makes
DIAGNOSTICS(_S), ASYN_DIAGNOSTICS and DIAG_REPL obsolete, although tty
and log still accept the codes for 'old' binaries. This also simplifies
diagnostics in several servers and drivers - only tty needs its own
kputc() now.
. simplifications in vfs, and some effort to get the vnode references
right (consistent) even during shutdown. m_mounted_on is now NULL
for root filesystems (!) (the original and new root), a less awkward
special case than 'm_mounted_on == m_root_node'. root now has exactly
one reference, to root, if no files are open, just like all other
filesystems. m_driver_e is unused.
Select now returns such a filedescriptor as ready (instead of EBADF).
Reply before dev_up in FSSIGNON to avoid the problem that a DEV_OPEN
request is received by a driver that expects a reply from the FSSIGNON.
