Hi there,
when hostfs is used as the UML's root filesystem its file descriptors
aren't closed when the kernel is rebooted. Subsequently, after a couple
of reboots the guest will reach the maximum number of allowed file
descriptors (usually 1024) and fail to open any more files.
I tried to fix the problem myself, see patch. It works for me, but I'm
not sure if it's the correct solution.
Cheers,
Ingo
Index: hostfs_kern.c
===================================================================
--- hostfs_kern.c (revision 8135)
+++ hostfs_kern.c (working copy)
@@ -16,6 +16,7 @@
#include <linux/list.h>
#include <linux/statfs.h>
#include <linux/kdev_t.h>
+#include <linux/mount.h>
#include <asm/uaccess.h>
#include "hostfs.h"
#include "kern_util.h"
@@ -1037,3 +1038,17 @@
module_init(init_hostfs)
module_exit(exit_hostfs)
MODULE_LICENSE("GPL");
+
+static void hostfs_exitcall(void)
+{
+ struct super_block *root_sb = current->fs->rootmnt->mnt_sb;
+ if (root_sb->s_type == &hostfs_type) {
+ struct inode *inode;
+ list_for_each_entry(inode, &root_sb->s_inodes, i_sb_list) {
+ if(HOSTFS_I(inode)->fd != -1) {
+ close_file(&HOSTFS_I(inode)->fd);
+ }
+ }
+ }
+}
+__uml_exitcall(hostfs_exitcall);
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