Filesystem: Reference counting for locations

 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.

1 files changed, 46 insertions, 79 deletions

diff --git a/cpukit/libfs/src/dosfs/msdos.h b/cpukit/libfs/src/dosfs/msdos.h
index 5e24d6ad1d..9bdfd881ec 100644
--- a/cpukit/libfs/src/dosfs/msdos.h
+++ b/cpukit/libfs/src/dosfs/msdos.h
@@ -168,7 +168,6 @@ typedef rtems_filesystem_node_types_t msdos_node_type_t;
 /*
  *  Macros for names parsing and formatting
  */
-#define msdos_is_separator(_ch)          rtems_filesystem_is_separator(_ch)
 
 #define MSDOS_SHORT_BASE_LEN             8  /* 8 characters */
 #define MSDOS_SHORT_EXT_LEN              3  /* 3 characters */
@@ -224,44 +223,40 @@ typedef enum msdos_token_types_e
 #define MSDOS_DPS512_NUM    16
 
 /* Prototypes */
-int msdos_shut_down(rtems_filesystem_mount_table_entry_t *temp_mt_entry);
+void msdos_shut_down(rtems_filesystem_mount_table_entry_t *temp_mt_entry);
 
-int msdos_eval_path(
-  const char                       *pathname,    /* IN */
-  size_t                            pathnamelen, /* IN */
-  int                               flags,       /* IN */
-  rtems_filesystem_location_info_t *pathloc      /* IN/OUT */
-);
-
-int msdos_eval4make(
-  const char                       *path,     /* IN */
-  rtems_filesystem_location_info_t *pathloc,  /* IN/OUT */
-  const char                       **name     /* OUT    */
-);
+void msdos_eval_path(rtems_filesystem_eval_path_context_t *ctx);
 
-int msdos_unlink(rtems_filesystem_location_info_t *pathloc /* IN */);
+void msdos_free_node_info(const rtems_filesystem_location_info_t *pathloc);
 
-int msdos_free_node_info(rtems_filesystem_location_info_t *pathloc /* IN */);
-
-rtems_filesystem_node_types_t msdos_node_type(rtems_filesystem_location_info_t    *pathloc);
+rtems_filesystem_node_types_t msdos_node_type(
+  const rtems_filesystem_location_info_t *loc
+);
 
 int msdos_mknod(
-  const char                       *path,   /* IN */
-  mode_t                            mode,   /* IN */
-  dev_t                             dev,    /* IN */
-  rtems_filesystem_location_info_t *pathloc /* IN/OUT */
+  const rtems_filesystem_location_info_t *loc,
+  const char *name,
+  size_t namelen,
+  mode_t mode,
+  dev_t dev
 );
 
-int msdos_utime(
-  rtems_filesystem_location_info_t *pathloc, /* IN */
-  time_t                            actime,  /* IN */
-  time_t                            modtime  /* IN */
+int msdos_rmnod(
+  const rtems_filesystem_location_info_t *parentloc,
+  const rtems_filesystem_location_info_t *loc
 );
 
-int msdos_rename(rtems_filesystem_location_info_t  *old_parent_loc,
-                 rtems_filesystem_location_info_t  *old_loc,
-                 rtems_filesystem_location_info_t  *new_parent_loc,
-                 const char                        *new_name);
+int msdos_rename(
+  const rtems_filesystem_location_info_t *old_parent_loc,
+  const rtems_filesystem_location_info_t *old_loc,
+  const rtems_filesystem_location_info_t *new_parent_loc,
+  const char *new_name,
+  size_t new_namelen
+);
+
+void msdos_lock(rtems_filesystem_mount_table_entry_t *mt_entry);
+
+void msdos_unlock(rtems_filesystem_mount_table_entry_t *mt_entry);
 
 int msdos_initialize_support(
   rtems_filesystem_mount_table_entry_t    *temp_mt_entry,
@@ -273,8 +268,8 @@ int msdos_initialize_support(
 int msdos_file_open(
   rtems_libio_t *iop,             /* IN  */
   const char    *pathname,        /* IN  */
-  uint32_t       flag,            /* IN  */
-  uint32_t       mode             /* IN  */
+  int            oflag,           /* IN  */
+  mode_t         mode             /* IN  */
 );
 
 int msdos_file_close(rtems_libio_t *iop /* IN  */);
@@ -298,8 +293,8 @@ off_t msdos_file_lseek(
 );
 
 int msdos_file_stat(
-  rtems_filesystem_location_info_t *loc, /* IN  */
-  struct stat                      *buf  /* OUT */
+  const rtems_filesystem_location_info_t *loc,
+  struct stat *buf
 );
 
 int
@@ -312,26 +307,11 @@ int msdos_file_sync(rtems_libio_t *iop);
 
 int msdos_file_datasync(rtems_libio_t *iop);
 
-int msdos_file_ioctl(
-  rtems_libio_t *iop,             /* IN  */
-  uint32_t       command,         /* IN  */
-  void          *buffer           /* IN  */
-);
-
-int
-msdos_dir_chmod(
-  rtems_filesystem_location_info_t *pathloc, /* IN */
-  mode_t                            mode     /* IN */
-);
-
-int msdos_file_rmnod(rtems_filesystem_location_info_t *parent_pathloc, /* IN */
-                     rtems_filesystem_location_info_t *pathloc /* IN */);
-
 int msdos_dir_open(
   rtems_libio_t *iop,             /* IN  */
   const char    *pathname,        /* IN  */
-  uint32_t       flag,            /* IN  */
-  uint32_t       mode             /* IN  */
+  int            oflag,           /* IN  */
+  mode_t         mode             /* IN  */
 );
 
 int msdos_dir_close(rtems_libio_t *iop /* IN  */);
@@ -348,34 +328,21 @@ off_t msdos_dir_lseek(
   int                   whence            /* IN  */
 );
 
-int
-msdos_file_chmod(
-  rtems_filesystem_location_info_t *pathloc, /* IN */
-  mode_t                            mode     /* IN */
-);
-
-int msdos_dir_rmnod(rtems_filesystem_location_info_t *parent_pathloc, /* IN */
-                    rtems_filesystem_location_info_t *pathloc /* IN */);
-
 int msdos_dir_sync(rtems_libio_t *iop);
 
 int msdos_dir_stat(
-  rtems_filesystem_location_info_t *loc,         /* IN  */
-  struct stat                      *buf          /* OUT */
+  const rtems_filesystem_location_info_t *loc,
+  struct stat *buf
 );
 
-int msdos_creat_node(rtems_filesystem_location_info_t  *parent_loc,
-                     msdos_node_type_t                  type,
-                     const char                        *name,
-                     int                                name_len,
-                     mode_t                             mode,
-                     const fat_file_fd_t               *link_fd);
+int msdos_creat_node(const rtems_filesystem_location_info_t *parent_loc,
+                     msdos_node_type_t                       type,
+                     const char                             *name,
+                     int                                     name_len,
+                     mode_t                                  mode,
+                     const fat_file_fd_t                    *link_fd);
 
 /* Misc prototypes */
-msdos_token_types_t msdos_get_token(const char  *path,
-                                    int          pathlen,
-                                    const char **token,
-                                    int         *token_len);
 
 int msdos_find_name(
   rtems_filesystem_location_info_t *parent_loc,
@@ -384,13 +351,13 @@ int msdos_find_name(
 );
 
 int msdos_get_name_node(
-  rtems_filesystem_location_info_t *parent_loc,
-  bool                              create_node,
-  const char                       *name,
-  int                               name_len,
-  msdos_name_type_t                 name_type,
-  fat_dir_pos_t                    *dir_pos,
-  char                             *name_dir_entry
+  const rtems_filesystem_location_info_t *parent_loc,
+  bool                                    create_node,
+  const char                             *name,
+  int                                     name_len,
+  msdos_name_type_t                       name_type,
+  fat_dir_pos_t                          *dir_pos,
+  char                                   *name_dir_entry
 );
 
 int msdos_dir_info_remove(rtems_filesystem_location_info_t *pathloc);