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root/fs/xfs/linux-2.6/xfs_stats.c

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DEFINITIONS

This source file includes following definitions.
  1. xfs_read_xfsstats
  2. xfs_init_procfs
  3. xfs_cleanup_procfs

/*
 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include "xfs.h"
#include <linux/proc_fs.h>

DEFINE_PER_CPU(struct xfsstats, xfsstats);

STATIC int
xfs_read_xfsstats(
        char            *buffer,
        char            **start,
        off_t           offset,
        int             count,
        int             *eof,
        void            *data)
{
        int             c, i, j, len, val;
        __uint64_t      xs_xstrat_bytes = 0;
        __uint64_t      xs_write_bytes = 0;
        __uint64_t      xs_read_bytes = 0;

        static const struct xstats_entry {
                char    *desc;
                int     endpoint;
        } xstats[] = {
                { "extent_alloc",       XFSSTAT_END_EXTENT_ALLOC        },
                { "abt",                XFSSTAT_END_ALLOC_BTREE         },
                { "blk_map",            XFSSTAT_END_BLOCK_MAPPING       },
                { "bmbt",               XFSSTAT_END_BLOCK_MAP_BTREE     },
                { "dir",                XFSSTAT_END_DIRECTORY_OPS       },
                { "trans",              XFSSTAT_END_TRANSACTIONS        },
                { "ig",                 XFSSTAT_END_INODE_OPS           },
                { "log",                XFSSTAT_END_LOG_OPS             },
                { "push_ail",           XFSSTAT_END_TAIL_PUSHING        },
                { "xstrat",             XFSSTAT_END_WRITE_CONVERT       },
                { "rw",                 XFSSTAT_END_READ_WRITE_OPS      },
                { "attr",               XFSSTAT_END_ATTRIBUTE_OPS       },
                { "icluster",           XFSSTAT_END_INODE_CLUSTER       },
                { "vnodes",             XFSSTAT_END_VNODE_OPS           },
                { "buf",                XFSSTAT_END_BUF                 },
        };

        /* Loop over all stats groups */
        for (i=j=len = 0; i < ARRAY_SIZE(xstats); i++) {
                len += sprintf(buffer + len, 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));
                        len += sprintf(buffer + len, " %u", val);
                        j++;
                }
                buffer[len++] = '\n';
        }
        /* extra precision counters */
        for_each_possible_cpu(i) {
                xs_xstrat_bytes += per_cpu(xfsstats, i).xs_xstrat_bytes;
                xs_write_bytes += per_cpu(xfsstats, i).xs_write_bytes;
                xs_read_bytes += per_cpu(xfsstats, i).xs_read_bytes;
        }

        len += sprintf(buffer + len, "xpc %Lu %Lu %Lu\n",
                        xs_xstrat_bytes, xs_write_bytes, xs_read_bytes);
        len += sprintf(buffer + len, "debug %u\n",
#if defined(DEBUG)
                1);
#else
                0);
#endif

        if (offset >= len) {
                *start = buffer;
                *eof = 1;
                return 0;
        }
        *start = buffer + offset;
        if ((len -= offset) > count)
                return count;
        *eof = 1;

        return len;
}

int
xfs_init_procfs(void)
{
        if (!proc_mkdir("fs/xfs", NULL))
                goto out;

        if (!create_proc_read_entry("fs/xfs/stat", 0, NULL,
                        xfs_read_xfsstats, NULL))
                goto out_remove_entry;
        return 0;

 out_remove_entry:
        remove_proc_entry("fs/xfs", NULL);
 out:
        return -ENOMEM;
}

void
xfs_cleanup_procfs(void)
{
        remove_proc_entry("fs/xfs/stat", NULL);
        remove_proc_entry("fs/xfs", NULL);
}

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