[PATCH hurd v1] ext2fs: raise RLIMIT_AS if running as the root fs

[dnietoc]

From: Diego Nieto Cid <dnie...@gmail.com>

Hello,

The ext2fs side of the changes seems to be as strightforward
as calling setrlimit when the bootstraap port is null, given
the following lines of diskfs_init_main:

    if (diskfs_boot_filesystem ())
      /* We are the bootstrap filesystem.  */
      *bootstrap = MACH_PORT_NULL;
    ...

I'm not sure abount the bit declaring variables inside the if
block being conforming to the standards.

Now I'll look into using the RPC in GLIBC's implementation of
setrlimit. But I still need to figure out how to install the
headers with the new RPC routines.

Regards,
Diego

-- >8 -- >8 -- >8 --

  * ext2fs/ext2fs.c(main): set current and max RLIMIT_AS to RLIM_INFINITY
    when running as the root filesystem.
---
 ext2fs/ext2fs.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/ext2fs/ext2fs.c b/ext2fs/ext2fs.c
index 3836bdf6..689e5e5b 100644
--- a/ext2fs/ext2fs.c
+++ b/ext2fs/ext2fs.c
@@ -22,6 +22,8 @@
 #include <stdio.h>
 #include <device/device.h>
 #include <fcntl.h>
+#include <sys/time.h>
+#include <sys/resource.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
@@ -230,6 +232,15 @@ main (int argc, char **argv)
   store = diskfs_init_main (&startup_argp, argc, argv,
                            &store_parsed, &bootstrap);
 
+  /* Lift default address space limits when we are the root filesystem */
+  if (bootstrap == MACH_PORT_NULL)
+    {
+      struct rlimit limits = { RLIM_INFINITY, RLIM_INFINITY };
+      int err = setrlimit (RLIMIT_AS, &limits);
+      if (err == -1)
+        perror ("error lifting address space limits");
+    }
+
   if (store->size < SBLOCK_OFFS + SBLOCK_SIZE)
     ext2_panic ("device too small for superblock (%" PRIi64 " bytes)", 
store->size);
   if (store->log2_blocks_per_page < 0)
-- 
2.47.1