Date: Thu, 14 Dec 2006 06:01:27 -0600 From: "Scot Hetzel" <swhetzel@gmail.com> To: emulation@freebsd.org Subject: linuxolator: proc/filesystems implementation Message-ID: <790a9fff0612140401h7bf0bdb0idb1590120ae95e3f@mail.gmail.com>
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[-- Attachment #1 --]
Linux has a file in the procfs that shows all the loaded filesystem modules.
I have implemented the function that fills this file using the linprocfs module.
What the function does is look for specific kernel modules using
module_lookupbyname to create an entry in the proc/filesystems file:
# cat /compat/linux/proc/filesystems
cd9660
nodev devfs
nodev bsdprocfs
mfs
msdosfs
nfs
nfs4
nodev procfs
nodev sysfs
ufs
# kldload smbfs
# cat /compat/linux/proc/filesystems
cd9660
nodev devfs
nodev bsdprocfs
mfs
msdosfs
nfs
nfs4
nodev procfs
smbfs
nodev sysfs
ufs
Unloading a filesystem kernel module will remove the entry from
proc/filesystems.
Scot
--
DISCLAIMER:
No electrons were mamed while sending this message. Only slightly bruised.
[-- Attachment #2 --]
Index: compat/linprocfs/linprocfs.c
===================================================================
RCS file: /home/ncvs/src/sys/compat/linprocfs/linprocfs.c,v
retrieving revision 1.101
diff -u -r1.101 linprocfs.c
--- compat/linprocfs/linprocfs.c 27 Nov 2006 21:10:55 -0000 1.101
+++ compat/linprocfs/linprocfs.c 29 Nov 2006 05:21:51 -0000
@@ -1031,6 +1031,65 @@
}
/*
+ * Filler function for proc/filesystems
+ *
+ * NOTE: The only problem is that as new filesystems are added, they
+ * will need to be added to this list alpabetically, as the
+ * list can't be updated dynamically.
+ */
+static int
+linprocfs_dofilesystems(PFS_FILL_ARGS)
+{
+
+#define FS_ADD(name, nodev, filesystem) \
+ if (module_lookupbyname(name) != NULL) \
+ sbuf_printf(sb, "%s\t%s\n", \
+ nodev ? "nodev" : "", filesystem);
+
+ MOD_SLOCK;
+ /*
+ * Print a list of the currently loaded kernel filesystem modules.
+ *
+ * FreeBSD No Linux
+ * Kernel Special Filesystem
+ * Module Device Name
+ */
+ FS_ADD("cd9660", 0, "cd9660");
+ FS_ADD("devfs", 1, "devfs");
+ FS_ADD("ext2fs", 0, "ext2fs");
+ FS_ADD("procfs", 1, "bsdprocfs"); /* renamed procfs module to bsdprocfs */
+ FS_ADD("fdescfs", 1, "fdescfs");
+ FS_ADD("g_md", 0, "mfs");
+ FS_ADD("msdosfs", 0, "msdosfs");
+
+ FS_ADD("nfs", 0, "nfs"); /* XXX: Should No Special Device be 1 for nfs* */
+ FS_ADD("nfs4", 0, "nfs4");
+
+ FS_ADD("ntfs", 0, "ntfs");
+ FS_ADD("nullfs", 1, "nullfs");
+
+ FS_ADD("nwfs", 0, "nwfs"); /* XXX: Should No Special Device be 1 for nwfs */
+
+ FS_ADD("linprocfs", 1, "procfs"); /* renamed to linux filesystem name */
+ FS_ADD("portalfs", 1, "portalfs");
+ FS_ADD("reiserfs", 0, "reiserfs");
+
+ FS_ADD("smbfs", 0, "smbfs"); /* XXX: Should No Special Device be 1 for smbfs */
+
+ FS_ADD("linsysfs", 1, "sysfs"); /* renamed to linux filesystem name */
+ FS_ADD("udf", 0, "udf");
+ FS_ADD("ufs", 0, "ufs");
+ FS_ADD("umapfs", 1, "umapfs");
+ FS_ADD("unionfs", 1, "unionfs");
+ FS_ADD("xfs", 0, "xfs");
+ FS_ADD("zfs", 0, "zfs");
+ MOD_SUNLOCK;
+#undef FS_ADD
+
+ return (0);
+}
+
+/*
* Filler function for proc/cmdline
*/
static int
@@ -1076,6 +1135,8 @@
NULL, NULL, PFS_RD);
pfs_create_file(root, "devices", &linprocfs_dodevices,
NULL, NULL, PFS_RD);
+ pfs_create_file(root, "filesystems", &linprocfs_dofilesystems,
+ NULL, NULL, PFS_RD);
pfs_create_file(root, "loadavg", &linprocfs_doloadavg,
NULL, NULL, PFS_RD);
pfs_create_file(root, "meminfo", &linprocfs_domeminfo,
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