LU-56 libcfs: implementation of cpu partition

[fs/lustre-release.git] / libcfs / libcfs / linux / linux-proc.c

diff --git a/libcfs/libcfs/linux/linux-proc.c b/libcfs/libcfs/linux/linux-proc.c
index c6c81e4..e82b675 100644 (file)
--- a/libcfs/libcfs/linux/linux-proc.c
+++ b/libcfs/libcfs/linux/linux-proc.c
@@ -97,6 +97,7 @@ enum {
         PSDEV_CONSOLE_BACKOFF,    /* delay increase factor */
         PSDEV_DEBUG_PATH,         /* crashdump log location */
         PSDEV_DEBUG_DUMP_PATH,    /* crashdump tracelog location */
+       PSDEV_CPT_TABLE,          /* information about cpu partitions */
         PSDEV_LNET_UPCALL,        /* User mode upcall script  */
         PSDEV_LNET_MEMUSED,       /* bytes currently PORTAL_ALLOCated */
         PSDEV_LNET_CATASTROPHE,   /* if we have LBUGged or panic'd */
@@ -121,6 +122,7 @@ enum {
 #define PSDEV_CONSOLE_BACKOFF           CTL_UNNUMBERED
 #define PSDEV_DEBUG_PATH                CTL_UNNUMBERED
 #define PSDEV_DEBUG_DUMP_PATH           CTL_UNNUMBERED
+#define PSDEV_CPT_TABLE                        CTL_UNNUMBERED
 #define PSDEV_LNET_UPCALL               CTL_UNNUMBERED
 #define PSDEV_LNET_MEMUSED              CTL_UNNUMBERED
 #define PSDEV_LNET_CATASTROPHE          CTL_UNNUMBERED
@@ -356,6 +358,48 @@ int LL_PROC_PROTO(proc_fail_loc)
         return rc;
 }
 
+static int __proc_cpt_table(void *data, int write,
+                           loff_t pos, void *buffer, int nob)
+{
+       char *buf = NULL;
+       int   len = 4096;
+       int   rc  = 0;
+
+       if (write)
+               return -EPERM;
+
+       LASSERT(cfs_cpt_table != NULL);
+
+       while (1) {
+               LIBCFS_ALLOC(buf, len);
+               if (buf == NULL)
+                       return -ENOMEM;
+
+               rc = cfs_cpt_table_print(cfs_cpt_table, buf, len);
+               if (rc >= 0)
+                       break;
+
+               LIBCFS_FREE(buf, len);
+               if (rc == -EFBIG) {
+                       len <<= 1;
+                       continue;
+               }
+               goto out;
+       }
+
+       if (pos >= rc) {
+               rc = 0;
+               goto out;
+       }
+
+       rc = cfs_trace_copyout_string(buffer, nob, buf + pos, NULL);
+ out:
+       if (buf != NULL)
+               LIBCFS_FREE(buf, len);
+       return rc;
+}
+DECLARE_PROC_HANDLER(proc_cpt_table)
+
 static cfs_sysctl_table_t lnet_table[] = {
         /*
          * NB No .strategy entries have been provided since sysctl(8) prefers
@@ -424,6 +468,14 @@ static cfs_sysctl_table_t lnet_table[] = {
                 .proc_handler = &proc_dostring,
         },
 
+       {
+               .ctl_name = PSDEV_CPT_TABLE,
+               .procname = "cpu_partition_table",
+               .maxlen   = 128,
+               .mode     = 0444,
+               .proc_handler = &proc_cpt_table,
+       },
+
         {
                 INIT_CTL_NAME(PSDEV_LNET_UPCALL)
                 .procname = "upcall",