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83104d449e
Trim CoW reservations made on behalf of a cowextsz hint if they get too old or we run low on quota, so long as we don't have dirty data awaiting writeback or directio operations in progress. Garbage collection of the cowextsize extents are kept separate from prealloc extent reaping because setting the CoW prealloc lifetime to a (much) higher value than the regular prealloc extent lifetime has been useful for combatting CoW fragmentation on VM hosts where the VMs experience bursty write behaviors and we can keep the utilization ratios low enough that we don't start to run out of space. IOWs, it benefits us to keep the CoW fork reservations around for as long as we can unless we run out of blocks or hit inode reclaim. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
110 lines
3.6 KiB
C
110 lines
3.6 KiB
C
/*
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* Copyright (c) 2001-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_SYSCTL_H__
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#define __XFS_SYSCTL_H__
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#include <linux/sysctl.h>
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/*
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* Tunable xfs parameters
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*/
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typedef struct xfs_sysctl_val {
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int min;
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int val;
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int max;
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} xfs_sysctl_val_t;
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typedef struct xfs_param {
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xfs_sysctl_val_t sgid_inherit; /* Inherit S_ISGID if process' GID is
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* not a member of parent dir GID. */
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xfs_sysctl_val_t symlink_mode; /* Link creat mode affected by umask */
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xfs_sysctl_val_t panic_mask; /* bitmask to cause panic on errors. */
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xfs_sysctl_val_t error_level; /* Degree of reporting for problems */
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xfs_sysctl_val_t syncd_timer; /* Interval between xfssyncd wakeups */
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xfs_sysctl_val_t stats_clear; /* Reset all XFS statistics to zero. */
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xfs_sysctl_val_t inherit_sync; /* Inherit the "sync" inode flag. */
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xfs_sysctl_val_t inherit_nodump;/* Inherit the "nodump" inode flag. */
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xfs_sysctl_val_t inherit_noatim;/* Inherit the "noatime" inode flag. */
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xfs_sysctl_val_t xfs_buf_timer; /* Interval between xfsbufd wakeups. */
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xfs_sysctl_val_t xfs_buf_age; /* Metadata buffer age before flush. */
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xfs_sysctl_val_t inherit_nosym; /* Inherit the "nosymlinks" flag. */
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xfs_sysctl_val_t rotorstep; /* inode32 AG rotoring control knob */
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xfs_sysctl_val_t inherit_nodfrg;/* Inherit the "nodefrag" inode flag. */
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xfs_sysctl_val_t fstrm_timer; /* Filestream dir-AG assoc'n timeout. */
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xfs_sysctl_val_t eofb_timer; /* Interval between eofb scan wakeups */
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xfs_sysctl_val_t cowb_timer; /* Interval between cowb scan wakeups */
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} xfs_param_t;
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/*
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* xfs_error_level:
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*
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* How much error reporting will be done when internal problems are
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* encountered. These problems normally return an EFSCORRUPTED to their
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* caller, with no other information reported.
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*
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* 0 No error reports
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* 1 Report EFSCORRUPTED errors that will cause a filesystem shutdown
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* 5 Report all EFSCORRUPTED errors (all of the above errors, plus any
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* additional errors that are known to not cause shutdowns)
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*
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* xfs_panic_mask bit 0x8 turns the error reports into panics
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*/
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enum {
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/* XFS_REFCACHE_SIZE = 1 */
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/* XFS_REFCACHE_PURGE = 2 */
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/* XFS_RESTRICT_CHOWN = 3 */
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XFS_SGID_INHERIT = 4,
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XFS_SYMLINK_MODE = 5,
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XFS_PANIC_MASK = 6,
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XFS_ERRLEVEL = 7,
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XFS_SYNCD_TIMER = 8,
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/* XFS_PROBE_DMAPI = 9 */
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/* XFS_PROBE_IOOPS = 10 */
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/* XFS_PROBE_QUOTA = 11 */
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XFS_STATS_CLEAR = 12,
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XFS_INHERIT_SYNC = 13,
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XFS_INHERIT_NODUMP = 14,
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XFS_INHERIT_NOATIME = 15,
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XFS_BUF_TIMER = 16,
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XFS_BUF_AGE = 17,
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/* XFS_IO_BYPASS = 18 */
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XFS_INHERIT_NOSYM = 19,
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XFS_ROTORSTEP = 20,
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XFS_INHERIT_NODFRG = 21,
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XFS_FILESTREAM_TIMER = 22,
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};
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extern xfs_param_t xfs_params;
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struct xfs_globals {
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int log_recovery_delay; /* log recovery delay (secs) */
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};
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extern struct xfs_globals xfs_globals;
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#ifdef CONFIG_SYSCTL
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extern int xfs_sysctl_register(void);
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extern void xfs_sysctl_unregister(void);
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#else
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# define xfs_sysctl_register() (0)
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# define xfs_sysctl_unregister() do { } while (0)
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#endif /* CONFIG_SYSCTL */
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#endif /* __XFS_SYSCTL_H__ */
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