Perform a context-dependent deferred location release to avoid a
deadlock on the file system instance locks, for example during a
chdir().
Update #2936.
Add path length parameter to
rtems_filesystem_eval_path_start_with_root_and_current() so that users
may pass paths without a '\0' termination.
Update #2558.
The scope of the file system operations is the file system instance.
The scope of the file system node handlers is the file location. The
benefit of moving the operations to the mount table entry is a size
reduction of the file location (rtems_filesystem_location_info_t). The
code size is slightly increased due to additional load instructions.
Restructure rtems_filesystem_mount_table_entry_t to improve cache
efficiency.
Script does what is expected and tries to do it as
smartly as possible.
+ remove occurrences of two blank comment lines
next to each other after Id string line removed.
+ remove entire comment blocks which only exited to
contain CVS Ids
+ If the processing left a blank line at the top of
a file, it was removed.
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.
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.
* libblock/src/bdbuf.c: Update comments.
* libblock/src/bdpart.c, libblock/src/ide_part_table.c: Get the
device from the rdev field of the stat buf.
* libcsupport/include/rtems/libio.h: Add a path length to evalpath
handler. Add parent locations to rmmod and unlink handlers.
* libcsupport/include/rtems/libio_.h: Add a path length to
rtems_filesystem_evaluate_path. Add
rtems_filesystem_evaluate_relative_path, rtems_filesystem_dirname,
and rtems_filesystem_prefix_separators. Remove
rtems_filesystem_evaluate_parent.
* libcsupport/src/base_fs.c, libcsupport/src/chdir.c,
libcsupport/src/chmod.c, libcsupport/src/chown.c,
libcsupport/src/chroot.c, libcsupport/src/fchdir.c,
libcsupport/src/link.c, libcsupport/src/mount.c,
libcsupport/src/open.c, libcsupport/src/privateenv.c,
libcsupport/src/readlink.c, libcsupport/src/unmount.c,
libcsupport/src/utime.c, libcsupport/src/unmount.c,
libcsupport/src/utime.c, libfs/src/devfs/devfs.h,
libfs/src/devfs/devfs_eval.c, libfs/src/devfs/devstat.c,
libfs/src/dosfs/msdos_create.c, libfs/src/dosfs/msdos_misc.c,
libfs/src/imfs/imfs.h, libfs/src/imfs/imfs_eval.c,
libfs/src/imfs/imfs_load_tar.c, libfs/src/imfs/ioman.c,
libfs/src/pipe/pipe.c, libmisc/fsmount/fsmount.c,
libnetworking/lib/ftpfs.c: Add the length parameter to the eval
call.
* libcsupport/src/eval.c: Add rtems_filesystem_prefix_separators,
rtems_filesystem_dirname,
rtems_filesystem_evaluate_relative_path. Add the length parameter
to the eval call.
* libcsupport/src/rmdir.c: Find the parent pathloc then the node
pathloc from that node. Remove the call to find the parent given
the node pathloc.
* libcsupport/src/stat.c: Add the length parameter to the eval
call. Set the device into the rdev field.
* libcsupport/src/unlink.c: Find the parent pathloc then the node
pathloc from that node. Remove the call to find the parent given
the node pathloc.
* libfs/src/dosfs/fat.c, libfs/src/dosfs/msdos_format.c: Get the
disk device number from the stat rdev field.
* libfs/src/dosfs/msdos.h: Add the length parameter to the eval
call. Add the parent pathloc to the rmnod handler.
* libfs/src/dosfs/msdos_dir.c: Add the parent pathloc to the rmnod
handler.
* libfs/src/dosfs/msdos_eval.c: Add the length parameter to the
eval and token call.
* libfs/src/imfs/imfs_directory.c: Add the parent pathloc to the
rmnod handler.
* libfs/src/imfs/imfs_fchmod.c: Do not test the mode flags for
only the allowed flags. Add the missing flags spec'ed in the POSIX
standard.
* libfs/src/imfs/imfs_fsunmount.c, libfs/src/imfs/imfs_rmnod.c,
libfs/src/imfs/imfs_unlink.c, libfs/src/imfs/memfile.c: Add the
parent node. Currently ignored in the IMFS.
* libfs/src/imfs/imfs_stat.c: Return the device number in the rdev
field.
* libfs/src/imfs/imfs_mknod.c, libfs/src/imfs/imfs_symlink.c : Add
the length parameter to the token call.
* libfs/src/nfsclient/src/nfs.c: Add the length parameter to the
eval call and parent node to the rmnod and unlink command.
* libmisc/shell/internal.h: Remove the libc mounter decl to make
public.
* libmisc/shell/main_mount.c: Add support for hooking external
mount support for new file systems.
* libmisc/shell/shell.h: Add helper functions for the mount
command.
* include/rtems/libio_.h, libc/chroot.c, libc/privateenv.c:
Private environment and chroot() enhancements and fixes. Comments:
+ privateenv has been modified to let at chroot() to be more
POSIX like Sergei Organov recommended.
+ A task owner lets that rtems_set_private_env() will be
called twice or more times.
+ chroot() can be called without a previous
rtems_set_private_env(); (transpanrently)
+ The second call of rtems_set_private_env() makes a internal
chroot("/") into global imfs_root.
+ chroot() runs like chdir() without a previous chdir("/") with
the global root.
+ The current directory can be in a wrong place like Linux and
many other Unices.
* cpu.c, rtems/score/cpu.h: Bug report from Peter Mueller
<peter.o.mueller@gmx.de> because of not correcting for the ISR
vector table now being allocated from the workspace.
