kernel/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                 /* we print both series of quota information together */
  65                 { "qm",                 XFSSTAT_END_QM                  },
  66         };
  67
  68         /* Loop over all stats groups */
  69
  70         for (i = j = 0; i < ARRAY_SIZE(xstats); i++) {
  71                 len += snprintf(buf + len, PATH_MAX - len, "%s",
  72                                 xstats[i].desc);
  73                 /* inner loop does each group */
  74                 for (; j < xstats[i].endpoint; j++)
  75                         len += snprintf(buf + len, PATH_MAX - len, " %u",
  76                                         counter_val(stats, j));
  77                 len += snprintf(buf + len, PATH_MAX - len, "\n");
  78         }
  79         /* extra precision counters */
  80         for_each_possible_cpu(i) {
  81                 xs_xstrat_bytes += per_cpu_ptr(stats, i)->xs_xstrat_bytes;
  82                 xs_write_bytes += per_cpu_ptr(stats, i)->xs_write_bytes;
  83                 xs_read_bytes += per_cpu_ptr(stats, i)->xs_read_bytes;
  84         }
  85
  86         len += snprintf(buf + len, PATH_MAX-len, "xpc %Lu %Lu %Lu\n",
  87                         xs_xstrat_bytes, xs_write_bytes, xs_read_bytes);
  88         len += snprintf(buf + len, PATH_MAX-len, "debug %u\n",
  89 #if defined(DEBUG)
  90                 1);
  91 #else
  92                 0);
  93 #endif
  94
  95         return len;
  96 }
  97
  98 void xfs_stats_clearall(struct xfsstats __percpu *stats)
  99 {
 100         int             c;
 101         __uint32_t      vn_active;
 102
 103         xfs_notice(NULL, "Clearing xfsstats");
 104         for_each_possible_cpu(c) {
 105                 preempt_disable();
 106                 /* save vn_active, it's a universal truth! */
 107                 vn_active = per_cpu_ptr(stats, c)->vn_active;
 108                 memset(per_cpu_ptr(stats, c), 0, sizeof(*stats));
 109                 per_cpu_ptr(stats, c)->vn_active = vn_active;
 110                 preempt_enable();
 111         }
 112 }
 113
 114 /* legacy quota interfaces */
 115 #ifdef CONFIG_XFS_QUOTA
 116 static int xqm_proc_show(struct seq_file *m, void *v)
 117 {
 118         /* maximum; incore; ratio free to inuse; freelist */
 119         seq_printf(m, "%d\t%d\t%d\t%u\n",
 120                    0, counter_val(xfsstats.xs_stats, XFSSTAT_END_XQMSTAT),
 121                    0, counter_val(xfsstats.xs_stats, XFSSTAT_END_XQMSTAT + 1));
 122         return 0;
 123 }
 124
 125 static int xqm_proc_open(struct inode *inode, struct file *file)
 126 {
 127         return single_open(file, xqm_proc_show, NULL);
 128 }
 129
 130 static const struct file_operations xqm_proc_fops = {
 131         .owner          = THIS_MODULE,
 132         .open           = xqm_proc_open,
 133         .read           = seq_read,
 134         .llseek         = seq_lseek,
 135         .release        = single_release,
 136 };
 137
 138 /* legacy quota stats interface no 2 */
 139 static int xqmstat_proc_show(struct seq_file *m, void *v)
 140 {
 141         int j;
 142
 143         seq_printf(m, "qm");
 144         for (j = XFSSTAT_END_IBT_V2; j < XFSSTAT_END_XQMSTAT; j++)
 145                 seq_printf(m, " %u", counter_val(xfsstats.xs_stats, j));
 146         seq_putc(m, '\n');
 147         return 0;
 148 }
 149
 150 static int xqmstat_proc_open(struct inode *inode, struct file *file)
 151 {
 152         return single_open(file, xqmstat_proc_show, NULL);
 153 }
 154
 155 static const struct file_operations xqmstat_proc_fops = {
 156         .owner          = THIS_MODULE,
 157         .open           = xqmstat_proc_open,
 158         .read           = seq_read,
 159         .llseek         = seq_lseek,
 160         .release        = single_release,
 161 };
 162 #endif /* CONFIG_XFS_QUOTA */
 163
 164 #ifdef CONFIG_PROC_FS
 165 int
 166 xfs_init_procfs(void)
 167 {
 168         if (!proc_mkdir("fs/xfs", NULL))
 169                 return -ENOMEM;
 170
 171         if (!proc_symlink("fs/xfs/stat", NULL,
 172                           "/sys/fs/xfs/stats/stats"))
 173                 goto out;
 174
 175 #ifdef CONFIG_XFS_QUOTA
 176         if (!proc_create("fs/xfs/xqmstat", 0, NULL,
 177                          &xqmstat_proc_fops))
 178                 goto out;
 179         if (!proc_create("fs/xfs/xqm", 0, NULL,
 180                          &xqm_proc_fops))
 181                 goto out;
 182 #endif
 183         return 0;
 184
 185 out:
 186         remove_proc_subtree("fs/xfs", NULL);
 187         return -ENOMEM;
 188 }
 189
 190 void
 191 xfs_cleanup_procfs(void)
 192 {
 193         remove_proc_subtree("fs/xfs", NULL);
 194 }
 195 #endif /* CONFIG_PROC_FS */