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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.
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* Makefile.am, preinstall.am, libcsupport/Makefile.am,
libcsupport/include/rtems/libcsupport.h,
libcsupport/include/rtems/libio.h, libcsupport/src/base_fs.c,
libcsupport/src/libio_init.c, libcsupport/src/newlibc_exit.c,
libcsupport/src/newlibc_init.c, libcsupport/src/sync.c,
libfs/Makefile.am, libfs/src/imfs/deviceio.c,
sapi/include/confdefs.h: Merge GSOC project code to add simple device
only filesystem (devfs), optionally completely drop out filesystem,
and to clean up disabling newlib reentrancy support. This dropped 17K
from the minimum.exe for sparc/sis and arm/rtl22xx_t now has a 15K
code space.
* libcsupport/src/__usrenv.c, libcsupport/src/newlibc_reent.c,
libfs/src/devfs/devclose.c, libfs/src/devfs/devfs.h,
libfs/src/devfs/devfs_eval.c, libfs/src/devfs/devfs_init.c,
libfs/src/devfs/devfs_mknod.c, libfs/src/devfs/devfs_node_type.c,
libfs/src/devfs/devfs_show.c, libfs/src/devfs/devioctl.c,
libfs/src/devfs/devopen.c, libfs/src/devfs/devread.c,
libfs/src/devfs/devstat.c, libfs/src/devfs/devwrite.c,
libfs/src/imfs/deviceerrno.c: New files.
* libcsupport/src/newlibc.c: Removed.
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