LU-10681: Disable tiny writes for append

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

diff --git a/lustre/llite/lproc_llite.c b/lustre/llite/lproc_llite.c
index d3bb8a0..c84394b 100644 (file)
--- a/lustre/llite/lproc_llite.c
+++ b/lustre/llite/lproc_llite.c
@@ -876,6 +876,39 @@ static int ll_sbi_flags_seq_show(struct seq_file *m, void *v)
 }
 LPROC_SEQ_FOPS_RO(ll_sbi_flags);
 
+static int ll_tiny_write_seq_show(struct seq_file *m, void *v)
+{
+       struct super_block *sb = m->private;
+       struct ll_sb_info *sbi = ll_s2sbi(sb);
+
+       seq_printf(m, "%u\n", !!(sbi->ll_flags & LL_SBI_TINY_WRITE));
+       return 0;
+}
+
+static ssize_t ll_tiny_write_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);
+       bool val;
+       int rc;
+
+       rc = kstrtobool_from_user(buffer, count, &val);
+       if (rc)
+               return rc;
+
+       spin_lock(&sbi->ll_lock);
+       if (val)
+               sbi->ll_flags |= LL_SBI_TINY_WRITE;
+       else
+               sbi->ll_flags &= ~LL_SBI_TINY_WRITE;
+       spin_unlock(&sbi->ll_lock);
+
+       return count;
+}
+LPROC_SEQ_FOPS(ll_tiny_write);
+
 static int ll_fast_read_seq_show(struct seq_file *m, void *v)
 {
        struct super_block *sb = m->private;
@@ -1126,6 +1159,8 @@ struct lprocfs_vars lprocfs_llite_obd_vars[] = {
          .fops =       &ll_fast_read_fops,                     },
        { .name =       "pio",
          .fops =       &ll_pio_fops,                           },
+       { .name =       "tiny_write",
+         .fops =       &ll_tiny_write_fops,                    },
        { NULL }
 };