LU-10092 llite: Add persistent cache on client

[fs/lustre-release.git] / lustre / llite / lproc_llite.c

diff --git a/lustre/llite/lproc_llite.c b/lustre/llite/lproc_llite.c
index 5030e0f..ed66cd8 100644 (file)
--- a/lustre/llite/lproc_llite.c
+++ b/lustre/llite/lproc_llite.c
@@ -1311,6 +1311,43 @@ static ssize_t ll_nosquash_nids_seq_write(struct file *file,
 
 LDEBUGFS_SEQ_FOPS(ll_nosquash_nids);
 
+static int ll_pcc_seq_show(struct seq_file *m, void *v)
+{
+       struct super_block *sb = m->private;
+       struct ll_sb_info *sbi = ll_s2sbi(sb);
+
+       return pcc_super_dump(&sbi->ll_pcc_super, m);
+}
+
+static ssize_t ll_pcc_seq_write(struct file *file, const char __user *buffer,
+                               size_t count, loff_t *off)
+{
+       struct seq_file *m = file->private_data;
+       struct super_block *sb = m->private;
+       struct ll_sb_info *sbi = ll_s2sbi(sb);
+       int rc;
+       char *kernbuf;
+
+       if (count >= LPROCFS_WR_PCC_MAX_CMD)
+               return -EINVAL;
+
+       if (!(exp_connect_flags2(sbi->ll_md_exp) & OBD_CONNECT2_PCC))
+               return -EOPNOTSUPP;
+
+       OBD_ALLOC(kernbuf, count + 1);
+       if (kernbuf == NULL)
+               return -ENOMEM;
+
+       if (copy_from_user(kernbuf, buffer, count))
+               GOTO(out_free_kernbuff, rc = -EFAULT);
+
+       rc = pcc_cmd_handle(kernbuf, count, &sbi->ll_pcc_super);
+out_free_kernbuff:
+       OBD_FREE(kernbuf, count + 1);
+       return rc ? rc : count;
+}
+LPROC_SEQ_FOPS(ll_pcc);
+
 struct lprocfs_vars lprocfs_llite_obd_vars[] = {
        { .name =       "site",
          .fops =       &ll_site_stats_fops                     },
@@ -1332,6 +1369,8 @@ struct lprocfs_vars lprocfs_llite_obd_vars[] = {
          .fops =       &ll_root_squash_fops                    },
        { .name =       "nosquash_nids",
          .fops =       &ll_nosquash_nids_fops                  },
+       { .name =       "pcc",
+         .fops =       &ll_pcc_fops,                           },
        { NULL }
 };