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libcsupport: Add no_regular_file_mknod as a mount option to the mount table

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- Add the bool flag no_regular_file_mknod to the mount table so a file
  system can indicate creating regular files is not done by
  use the mknod handler. The file system will handle creating a
  file node in the open handler.

- Note, the mount option is an enum which means there is only one
  exclusive option supported. As a result no encapsulation is
  provided and file systems need to set no_regular_file_mknod directly.

Closes #4222
This commit is contained in:
Chris Johns
2021-02-08 13:10:37 +11:00
parent ee14fdfe19
commit 822cad8967
2 changed files with 9 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files
cpukit/include/rtems/libio.h
+1
View File
@@ -1613,6 +1613,7 @@ struct rtems_filesystem_mount_table_entry_tt {
rtems_filesystem_global_location_t *mt_fs_root;
bool mounted;
bool writeable;
bool no_regular_file_mknod;
const rtems_filesystem_limits_and_options_t *pathconf_limits_and_options;
/*
cpukit/libcsupport/src/open.c
+8 -5
View File
@@ -34,7 +34,7 @@ static void create_regular_file(
)
{
int rv = 0;
const rtems_filesystem_location_info_t *currentloc =
const rtems_filesystem_location_info_t *currentloc =
rtems_filesystem_eval_path_get_currentloc( ctx );
const char *token = rtems_filesystem_eval_path_get_token( ctx );
size_t tokenlen = rtems_filesystem_eval_path_get_tokenlen( ctx );
@@ -85,10 +85,15 @@ static int do_open(
| (make ? RTEMS_FS_MAKE : 0)
| (exclusive ? RTEMS_FS_EXCLUSIVE : 0);
rtems_filesystem_eval_path_context_t ctx;
const rtems_filesystem_location_info_t *currentloc;
bool create_reg_file;
rtems_filesystem_eval_path_start( &ctx, path, eval_flags );
if ( rtems_filesystem_eval_path_has_token( &ctx ) ) {
currentloc = rtems_filesystem_eval_path_get_currentloc( &ctx );
create_reg_file = !currentloc->mt_entry->no_regular_file_mknod;
if ( create_reg_file && rtems_filesystem_eval_path_has_token( &ctx ) ) {
create_regular_file( &ctx, mode );
}
@@ -99,11 +104,9 @@ static int do_open(
#endif
if ( write_access || open_dir ) {
const rtems_filesystem_location_info_t *currentloc =
rtems_filesystem_eval_path_get_currentloc( &ctx );
mode_t type = rtems_filesystem_location_type( currentloc );
if ( write_access && S_ISDIR( type ) ) {
if ( create_reg_file && write_access && S_ISDIR( type ) ) {
rtems_filesystem_eval_path_error( &ctx, EISDIR );
}