xfs: use common code for quota statistics

Switch the quota code over to use the generic XFS statistics infrastructure.
While the legacy /proc/fs/xfs/xqm and /proc/fs/xfs/xqmstats interfaces are
preserved for now the statistics that still have a meaning with the current
code are now also available from /proc/fs/xfs/stats.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

1 files changed, 87 insertions, 12 deletions

diff --git a/fs/xfs/xfs_stats.c b/fs/xfs/xfs_stats.c
index 76fdc5861932..ce372b7d5644 100644
--- a/fs/xfs/xfs_stats.c
+++ b/fs/xfs/xfs_stats.c
@@ -20,9 +20,18 @@
 
 DEFINE_PER_CPU(struct xfsstats, xfsstats);
 
+static int counter_val(int idx)
+{
+        int val = 0, cpu;
+
+        for_each_possible_cpu(cpu)
+                val += *(((__u32 *)&per_cpu(xfsstats, cpu) + idx));
+        return val;
+}
+
 static int xfs_stat_proc_show(struct seq_file *m, void *v)
 {
-        int             c, i, j, val;
+        int             i, j;
         __uint64_t      xs_xstrat_bytes = 0;
         __uint64_t      xs_write_bytes = 0;
         __uint64_t      xs_read_bytes = 0;
@@ -50,20 +59,16 @@ static int xfs_stat_proc_show(struct seq_file *m, void *v)
                 { "abtc2",              XFSSTAT_END_ABTC_V2             },
                 { "bmbt2",              XFSSTAT_END_BMBT_V2             },
                 { "ibt2",               XFSSTAT_END_IBT_V2              },
+                /* we print both series of quota information together */
+                { "qm",                 XFSSTAT_END_QM                  },
         };
 
         /* Loop over all stats groups */
-        for (i=j = 0; i < ARRAY_SIZE(xstats); i++) {
+        for (i = j = 0; i < ARRAY_SIZE(xstats); i++) {
                 seq_printf(m, "%s", xstats[i].desc);
                 /* inner loop does each group */
-                while (j < xstats[i].endpoint) {
-                        val = 0;
-                        /* sum over all cpus */
-                        for_each_possible_cpu(c)
-                                val += *(((__u32*)&per_cpu(xfsstats, c) + j));
-                        seq_printf(m, " %u", val);
-                        j++;
-                }
+                for (; j < xstats[i].endpoint; j++)
+                        seq_printf(m, " %u", counter_val(j));
                 seq_putc(m, '\n');
         }
         /* extra precision counters */
@@ -97,6 +102,58 @@ static const struct file_operations xfs_stat_proc_fops = {
         .release        = single_release,
 };
 
+/* legacy quota interfaces */
+#ifdef CONFIG_XFS_QUOTA
+static int xqm_proc_show(struct seq_file *m, void *v)
+{
+        /* maximum; incore; ratio free to inuse; freelist */
+        seq_printf(m, "%d\t%d\t%d\t%u\n",
+                        0,
+                        counter_val(XFSSTAT_END_XQMSTAT),
+                        0,
+                        counter_val(XFSSTAT_END_XQMSTAT + 1));
+        return 0;
+}
+
+static int xqm_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, xqm_proc_show, NULL);
+}
+
+static const struct file_operations xqm_proc_fops = {
+        .owner          = THIS_MODULE,
+        .open           = xqm_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+/* legacy quota stats interface no 2 */
+static int xqmstat_proc_show(struct seq_file *m, void *v)
+{
+        int j;
+
+        seq_printf(m, "qm");
+        for (j = XFSSTAT_END_IBT_V2; j < XFSSTAT_END_XQMSTAT; j++)
+                seq_printf(m, " %u", counter_val(j));
+        seq_putc(m, '\n');
+        return 0;
+}
+
+static int xqmstat_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, xqmstat_proc_show, NULL);
+}
+
+static const struct file_operations xqmstat_proc_fops = {
+        .owner          = THIS_MODULE,
+        .open           = xqmstat_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+#endif /* CONFIG_XFS_QUOTA */
+
 int
 xfs_init_procfs(void)
 {
@@ -105,10 +162,24 @@ xfs_init_procfs(void)
 
         if (!proc_create("fs/xfs/stat", 0, NULL,
                          &xfs_stat_proc_fops))
-                goto out_remove_entry;
+                goto out_remove_xfs_dir;
+#ifdef CONFIG_XFS_QUOTA
+        if (!proc_create("fs/xfs/xqmstat", 0, NULL,
+                         &xqmstat_proc_fops))
+                goto out_remove_stat_file;
+        if (!proc_create("fs/xfs/xqm", 0, NULL,
+                         &xqm_proc_fops))
+                goto out_remove_xqmstat_file;
+#endif
         return 0;
 
- out_remove_entry:
+#ifdef CONFIG_XFS_QUOTA
+ out_remove_xqmstat_file:
+        remove_proc_entry("fs/xfs/xqmstat", NULL);
+ out_remove_stat_file:
+        remove_proc_entry("fs/xfs/stat", NULL);
+#endif
+ out_remove_xfs_dir:
         remove_proc_entry("fs/xfs", NULL);
  out:
         return -ENOMEM;
@@ -117,6 +188,10 @@ xfs_init_procfs(void)
 void
 xfs_cleanup_procfs(void)
 {
+#ifdef CONFIG_XFS_QUOTA
+        remove_proc_entry("fs/xfs/xqm", NULL);
+        remove_proc_entry("fs/xfs/xqmstat", NULL);
+#endif
         remove_proc_entry("fs/xfs/stat", NULL);
         remove_proc_entry("fs/xfs", NULL);
 }