Generic nodes are an alternative to standard drivers in RTEMS. The
handlers of a generic node are called with less overhead compared to the
standard driver operations. The usage of file system node handlers
enable more features like support for fsync() and fdatasync(). The
generic nodes use the reference counting of the IMFS. This provides
automatic node destruction when the last reference vanishes.
Extend type IMFS_types_union by new type IMFS_generic_t.
Extend enum IMFS_jnode_types_t by IMFS_GENERIC.
Add functions
o IMFS_make_generic_node(),
o IMFS_is_imfs_instance(),
o IMFS_generic_get_context_by_node(),
o IMFS_generic_get_context_by_location(), and
o IMFS_generic_get_context_by_iop().
New test fstests/fsimfsgeneric01.
Add and use structure IMFS_node_control with support functions. This
helps to make high level functions independent of the node type and
reduces the number of branches in the code.
o Removed RTEMS_LIBIO_PERMS_SEARCH.
o Renamed RTEMS_LIBIO_PERMS_READ in RTEMS_FS_PERMS_READ.
o Renamed RTEMS_LIBIO_PERMS_WRITE in RTEMS_FS_PERMS_WRITE.
o Renamed RTEMS_LIBIO_PERMS_EXEC in RTEMS_FS_PERMS_EXEC.
o Renamed RTEMS_LIBIO_FOLLOW_HARD_LINK in RTEMS_FS_FOLLOW_HARD_LINK.
o Renamed RTEMS_LIBIO_FOLLOW_SYM_LINK in RTEMS_FS_FOLLOW_SYM_LINK.
o Renamed RTEMS_LIBIO_MAKE in RTEMS_FS_MAKE.
o Renamed RTEMS_LIBIO_EXCLUSIVE in RTEMS_FS_EXCLUSIVE.
o Renamed RTEMS_LIBIO_ACCEPT_RESIDUAL_DELIMITERS in
RTEMS_FS_ACCEPT_RESIDUAL_DELIMITERS.
o Renamed RTEMS_LIBIO_REJECT_TERMINAL_DOT in
RTEMS_FS_REJECT_TERMINAL_DOT.
New defaults rtems_filesystem_default_fsync_or_fdatasync() and
rtems_filesystem_default_fsync_or_fdatasync_success() for fsync_h and
fdatasync_h. The rtems_filesystem_default_fsync_or_fdatasync() sets now
errno to EINVAL according to POSIX.
Move the RTEMS_FILESYSTEM_INVALID_NODE_TYPE to the end. This makes it
possible to use this enum easily as an array index. Most comparisons
are made against RTEMS_FILESYSTEM_DIRECTORY. A value of zero allows on
some architectures simpler branch operations.
o Make sure EROFS is indicated for write operations on a read-only file
system.
o Add error indication for read-only file systems in fchmod() and
fchown() according to POSIX.
o A new data structure rtems_filesystem_global_location_t was
introduced to be used for
o the mount point location in the mount table entry,
o the file system root location in the mount table entry,
o the root directory location in the user environment, and
o the current directory location in the user environment.
During the path evaluation global start locations are obtained to
ensure that the current file system instance will be not unmounted in
the meantime.
o The user environment uses now reference counting and is protected
from concurrent access.
o The path evaluation process was completely rewritten and simplified.
The IMFS, RFS, NFS, and DOSFS use now a generic path evaluation
method. Recursive calls in the path evaluation have been replaced
with iteration to avoid stack overflows. Only the evaluation of
symbolic links is recursive. No dynamic memory allocations and
intermediate buffers are used in the high level path evaluation. No
global locks are held during the file system instance specific path
evaluation process.
o Recursive symbolic link evaluation is now limited by
RTEMS_FILESYSTEM_SYMLOOP_MAX. Applications can retrieve this value
via sysconf().
o The device file system (devFS) uses now no global variables and
allocation from the workspace. Node names are allocated from the
heap.
o The upper layer lseek() performs now some parameter checks.
o The upper layer ftruncate() performs now some parameter checks.
o unmask() is now restricted to the RWX flags and protected from
concurrent access.
o The fchmod_h and rmnod_h file system node handlers are now a file
system operation.
o The unlink_h operation has been removed. All nodes are now destroyed
with the rmnod_h operation.
o New lock_h, unlock_h, clonenod_h, and are_nodes_equal_h file system
operations.
o The path evaluation and file system operations are now protected by
per file system instance lock and unlock operations.
o Fix and test file descriptor duplicate in fcntl().
o New test fstests/fsnofs01.
We increased PMEM to 8 kB but never updated SOFTUSB_PMEM_SIZE.
This didn't have much of an effect because all we used it for was
to zero unused program memory - which we should never touch
anyway.
But now that "usb load" in FN uses SOFTUSB_PMEM_SIZE, this caused
it to silently truncate the firmware, producing rather puzzling
effects.
Signed-off-by: Joel Sherrill <joel.sherrill@oarcorp.com>
Add a red-black tree helper method to ease obtaining the direction opposite
to the current direction. Useful for manipulating and traversing an rbtree.
The tests for the rtems_rbtree_predecessor/successor check for a
range of values for the target id of the predecessor/successor
when we know the exact expected value. This commit makes the
test more precise.
Leave the task of providing a suitable firmware for the Milkymist softusb
core to the application instead of having an inflexible array in the driver.
Signed-off-by: Gedare Bloom <gedare@rtems.org>
Slightly adjust video timing registers since we had problems with a few screens and the previous values.
Signed-off-by: Gedare Bloom <gedare@rtems.org>
* configure.ac: Check for rcmd in unistd.h.
* libnetworking/libc/rcmd.c: Build iff rcmd is declared in unistd.h.
Change rcmd's decl to match with Linux/FreeBSD's decl.
With the addition of dynamically registered libchip serial devices,
there is the need to be able to use printk() before the console driver
has initialized the indirect pointer table. This lets printk() support
routines call pass a control structure directly without a lookup through
the uninitialized indirect one.
* nsecs/system.h: New (Split out from nsecs/init.c).
* nsecs/init.c: Reflect nsecs/system.h having been split out.
* nsecs/empty.c: Include "system.h".
PR 2015/bsps
Since the configuration struct is always present one can let
DATA initialize it to reduce footprint, at the same time it
is made weak to let the user able to configure the SHM driver
without editing the driver code.
Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
