fs/xfs/xfs_stats.c

   1 /*
   2  * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include <linux/proc_fs.h>
  20
  21 struct xstats xfsstats;
  22
  23 static int counter_val(struct xfsstats __percpu *stats, int idx)
  24 {
  25         int val = 0, cpu;
  26
  27         for_each_possible_cpu(cpu)
  28                 val += *(((__u32 *)per_cpu_ptr(stats, cpu) + idx));
  29         return val;
  30 }
  31
  32 int xfs_stats_format(struct xfsstats __percpu *stats, char *buf)
  33 {
  34         int             i, j;
  35         int             len = 0;
  36         uint64_t        xs_xstrat_bytes = 0;
  37         uint64_t        xs_write_bytes = 0;
  38         uint64_t        xs_read_bytes = 0;
  39
  40         static const struct xstats_entry {
  41                 char    *desc;
  42                 int     endpoint;
  43         } xstats[] = {
  44                 { "extent_alloc",       XFSSTAT_END_EXTENT_ALLOC        },
  45                 { "abt",                XFSSTAT_END_ALLOC_BTREE         },
  46                 { "blk_map",            XFSSTAT_END_BLOCK_MAPPING       },
  47                 { "bmbt",               XFSSTAT_END_BLOCK_MAP_BTREE     },
  48                 { "dir",                XFSSTAT_END_DIRECTORY_OPS       },
  49                 { "trans",              XFSSTAT_END_TRANSACTIONS        },
  50                 { "ig",                 XFSSTAT_END_INODE_OPS           },
  51                 { "log",                XFSSTAT_END_LOG_OPS             },
  52                 { "push_ail",           XFSSTAT_END_TAIL_PUSHING        },
  53                 { "xstrat",             XFSSTAT_END_WRITE_CONVERT       },
  54                 { "rw",                 XFSSTAT_END_READ_WRITE_OPS      },
  55                 { "attr",               XFSSTAT_END_ATTRIBUTE_OPS       },
  56                 { "icluster",           XFSSTAT_END_INODE_CLUSTER       },
  57                 { "vnodes",             XFSSTAT_END_VNODE_OPS           },
  58                 { "buf",                XFSSTAT_END_BUF                 },
  59                 { "abtb2",              XFSSTAT_END_ABTB_V2             },
  60                 { "abtc2",              XFSSTAT_END_ABTC_V2             },
  61                 { "bmbt2",              XFSSTAT_END_BMBT_V2             },
  62                 { "ibt2",               XFSSTAT_END_IBT_V2              },
  63                 { "fibt2",              XFSSTAT_END_FIBT_V2             },
  64                 { "rmapbt",             XFSSTAT_END_RMAP_V2             },
  65                 { "refcntbt",           XFSSTAT_END_REFCOUNT            },
  66                 /* we print both series of quota information together */
  67                 { "qm",                 XFSSTAT_END_QM                  },
  68         };
  69
  70         /* Loop over all stats groups */
  71
  72         for (i = j = 0; i < ARRAY_SIZE(xstats); i++) {
  73                 len += snprintf(buf + len, PATH_MAX - len, "%s",
  74                                 xstats[i].desc);
  75                 /* inner loop does each group */
  76                 for (; j < xstats[i].endpoint; j++)
  77                         len += snprintf(buf + len, PATH_MAX - len, " %u",
  78                                         counter_val(stats, j));
  79                 len += snprintf(buf + len, PATH_MAX - len, "\n");
  80         }
  81         /* extra precision counters */
  82         for_each_possible_cpu(i) {
  83                 xs_xstrat_bytes += per_cpu_ptr(stats, i)->s.xs_xstrat_bytes;
  84                 xs_write_bytes += per_cpu_ptr(stats, i)->s.xs_write_bytes;
  85                 xs_read_bytes += per_cpu_ptr(stats, i)->s.xs_read_bytes;
  86         }
  87
  88         len += snprintf(buf + len, PATH_MAX-len, "xpc %Lu %Lu %Lu\n",
  89                         xs_xstrat_bytes, xs_write_bytes, xs_read_bytes);
  90         len += snprintf(buf + len, PATH_MAX-len, "debug %u\n",
  91 #if defined(DEBUG)
  92                 1);
  93 #else
  94                 0);
  95 #endif
  96
  97         return len;
  98 }
  99
 100 void xfs_stats_clearall(struct xfsstats __percpu *stats)
 101 {
 102         int             c;
 103         uint32_t        vn_active;
 104
 105         xfs_notice(NULL, "Clearing xfsstats");
 106         for_each_possible_cpu(c) {
 107                 preempt_disable();
 108                 /* save vn_active, it's a universal truth! */
 109                 vn_active = per_cpu_ptr(stats, c)->s.vn_active;
 110                 memset(per_cpu_ptr(stats, c), 0, sizeof(*stats));
 111                 per_cpu_ptr(stats, c)->s.vn_active = vn_active;
 112                 preempt_enable();
 113         }
 114 }
 115
 116 /* legacy quota interfaces */
 117 #ifdef CONFIG_XFS_QUOTA
 118 static int xqm_proc_show(struct seq_file *m, void *v)
 119 {
 120         /* maximum; incore; ratio free to inuse; freelist */
 121         seq_printf(m, "%d\t%d\t%d\t%u\n",
 122                    0, counter_val(xfsstats.xs_stats, XFSSTAT_END_XQMSTAT),
 123                    0, counter_val(xfsstats.xs_stats, XFSSTAT_END_XQMSTAT + 1));
 124         return 0;
 125 }
 126
 127 static int xqm_proc_open(struct inode *inode, struct file *file)
 128 {
 129         return single_open(file, xqm_proc_show, NULL);
 130 }
 131
 132 static const struct file_operations xqm_proc_fops = {
 133         .open           = xqm_proc_open,
 134         .read           = seq_read,
 135         .llseek         = seq_lseek,
 136         .release        = single_release,
 137 };
 138
 139 /* legacy quota stats interface no 2 */
 140 static int xqmstat_proc_show(struct seq_file *m, void *v)
 141 {
 142         int j;
 143
 144         seq_printf(m, "qm");
 145         for (j = XFSSTAT_END_IBT_V2; j < XFSSTAT_END_XQMSTAT; j++)
 146                 seq_printf(m, " %u", counter_val(xfsstats.xs_stats, j));
 147         seq_putc(m, '\n');
 148         return 0;
 149 }
 150
 151 static int xqmstat_proc_open(struct inode *inode, struct file *file)
 152 {
 153         return single_open(file, xqmstat_proc_show, NULL);
 154 }
 155
 156 static const struct file_operations xqmstat_proc_fops = {
 157         .owner          = THIS_MODULE,
 158         .open           = xqmstat_proc_open,
 159         .read           = seq_read,
 160         .llseek         = seq_lseek,
 161         .release        = single_release,
 162 };
 163 #endif /* CONFIG_XFS_QUOTA */
 164
 165 #ifdef CONFIG_PROC_FS
 166 int
 167 xfs_init_procfs(void)
 168 {
 169         if (!proc_mkdir("fs/xfs", NULL))
 170                 return -ENOMEM;
 171
 172         if (!proc_symlink("fs/xfs/stat", NULL,
 173                           "/sys/fs/xfs/stats/stats"))
 174                 goto out;
 175
 176 #ifdef CONFIG_XFS_QUOTA
 177         if (!proc_create("fs/xfs/xqmstat", 0, NULL,
 178                          &xqmstat_proc_fops))
 179                 goto out;
 180         if (!proc_create("fs/xfs/xqm", 0, NULL,
 181                          &xqm_proc_fops))
 182                 goto out;
 183 #endif
 184         return 0;
 185
 186 out:
 187         remove_proc_subtree("fs/xfs", NULL);
 188         return -ENOMEM;
 189 }
 190
 191 void
 192 xfs_cleanup_procfs(void)
 193 {
 194         remove_proc_subtree("fs/xfs", NULL);
 195 }
 196 #endif /* CONFIG_PROC_FS */