xfs_sysctl.h

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/*
 * Copyright (c) 2001-2005 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
 */
#ifndef __XFS_SYSCTL_H__
#define __XFS_SYSCTL_H__

#include <linux/sysctl.h>

/*
 * Tunable xfs parameters
 */

typedef struct xfs_sysctl_val {
    int min;
    int val;
    int max;
} xfs_sysctl_val_t;

typedef struct xfs_param {
    xfs_sysctl_val_t sgid_inherit;  /* Inherit S_ISGID if process' GID is
                     * not a member of parent dir GID. */
    xfs_sysctl_val_t symlink_mode;  /* Link creat mode affected by umask */
    xfs_sysctl_val_t panic_mask;    /* bitmask to cause panic on errors. */
    xfs_sysctl_val_t error_level;   /* Degree of reporting for problems  */
    xfs_sysctl_val_t syncd_timer;   /* Interval between xfssyncd wakeups */
    xfs_sysctl_val_t stats_clear;   /* Reset all XFS statistics to zero. */
    xfs_sysctl_val_t inherit_sync;  /* Inherit the "sync" inode flag. */
    xfs_sysctl_val_t inherit_nodump;/* Inherit the "nodump" inode flag. */
    xfs_sysctl_val_t inherit_noatim;/* Inherit the "noatime" inode flag. */
    xfs_sysctl_val_t xfs_buf_timer; /* Interval between xfsbufd wakeups. */
    xfs_sysctl_val_t xfs_buf_age;   /* Metadata buffer age before flush. */
    xfs_sysctl_val_t inherit_nosym; /* Inherit the "nosymlinks" flag. */
    xfs_sysctl_val_t rotorstep; /* inode32 AG rotoring control knob */
    xfs_sysctl_val_t inherit_nodfrg;/* Inherit the "nodefrag" inode flag. */
    xfs_sysctl_val_t fstrm_timer;   /* Filestream dir-AG assoc'n timeout. */
} xfs_param_t;

/*
 * xfs_error_level:
 *
 * How much error reporting will be done when internal problems are
 * encountered.  These problems normally return an EFSCORRUPTED to their
 * caller, with no other information reported.
 *
 * 0    No error reports
 * 1    Report EFSCORRUPTED errors that will cause a filesystem shutdown
 * 5    Report all EFSCORRUPTED errors (all of the above errors, plus any
 *  additional errors that are known to not cause shutdowns)
 *
 * xfs_panic_mask bit 0x8 turns the error reports into panics
 */

enum {
    /* XFS_REFCACHE_SIZE = 1 */
    /* XFS_REFCACHE_PURGE = 2 */
    /* XFS_RESTRICT_CHOWN = 3 */
    XFS_SGID_INHERIT = 4,
    XFS_SYMLINK_MODE = 5,
    XFS_PANIC_MASK = 6,
    XFS_ERRLEVEL = 7,
    XFS_SYNCD_TIMER = 8,
    /* XFS_PROBE_DMAPI = 9 */
    /* XFS_PROBE_IOOPS = 10 */
    /* XFS_PROBE_QUOTA = 11 */
    XFS_STATS_CLEAR = 12,
    XFS_INHERIT_SYNC = 13,
    XFS_INHERIT_NODUMP = 14,
    XFS_INHERIT_NOATIME = 15,
    XFS_BUF_TIMER = 16,
    XFS_BUF_AGE = 17,
    /* XFS_IO_BYPASS = 18 */
    XFS_INHERIT_NOSYM = 19,
    XFS_ROTORSTEP = 20,
    XFS_INHERIT_NODFRG = 21,
    XFS_FILESTREAM_TIMER = 22,
};

extern xfs_param_t  xfs_params;

#ifdef CONFIG_SYSCTL
extern int xfs_sysctl_register(void);
extern void xfs_sysctl_unregister(void);
#else
# define xfs_sysctl_register()      (0)
# define xfs_sysctl_unregister()    do { } while (0)
#endif /* CONFIG_SYSCTL */

#endif /* __XFS_SYSCTL_H__ */