efb170c228
Add a new field to fs_pin - kill(pin). That's what umount and r/o remount will be calling for all pins attached to vfsmount and superblock resp. Called after bumping the refcount, so it won't go away under us. Dropping the refcount is responsibility of the instance. All generic stuff moved to fs/fs_pin.c; the next step will rip all the knowledge of kernel/acct.c from fs/super.c and fs/namespace.c. After that - death to mnt_pin(); it was intended to be usable as generic mechanism for code that wants to attach objects to vfsmount, so that they would not make the sucker busy and would get killed on umount. Never got it right; it remained acct.c-specific all along. Now it's very close to being killable. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
/*
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* BSD Process Accounting for Linux - Definitions
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*
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* Author: Marco van Wieringen (mvw@planets.elm.net)
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*
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* This header file contains the definitions needed to implement
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* BSD-style process accounting. The kernel accounting code and all
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* user-level programs that try to do something useful with the
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* process accounting log must include this file.
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*
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* Copyright (C) 1995 - 1997 Marco van Wieringen - ELM Consultancy B.V.
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*
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*/
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#ifndef _LINUX_ACCT_H
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#define _LINUX_ACCT_H
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#include <uapi/linux/acct.h>
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#ifdef CONFIG_BSD_PROCESS_ACCT
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struct vfsmount;
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struct super_block;
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struct pacct_struct;
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struct pid_namespace;
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extern int acct_parm[]; /* for sysctl */
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extern void acct_collect(long exitcode, int group_dead);
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extern void acct_process(void);
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extern void acct_exit_ns(struct pid_namespace *);
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#else
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#define acct_collect(x,y) do { } while (0)
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#define acct_process() do { } while (0)
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#define acct_exit_ns(ns) do { } while (0)
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#endif
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extern void acct_auto_close(struct hlist_head *);
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extern void acct_auto_close_mnt(struct hlist_head *);
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/*
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* ACCT_VERSION numbers as yet defined:
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* 0: old format (until 2.6.7) with 16 bit uid/gid
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* 1: extended variant (binary compatible on M68K)
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* 2: extended variant (binary compatible on everything except M68K)
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* 3: new binary incompatible format (64 bytes)
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* 4: new binary incompatible format (128 bytes)
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* 5: new binary incompatible format (128 bytes, second half)
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*
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*/
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#undef ACCT_VERSION
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#undef AHZ
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#ifdef CONFIG_BSD_PROCESS_ACCT_V3
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#define ACCT_VERSION 3
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#define AHZ 100
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typedef struct acct_v3 acct_t;
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#else
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#ifdef CONFIG_M68K
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#define ACCT_VERSION 1
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#else
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#define ACCT_VERSION 2
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#endif
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#define AHZ (USER_HZ)
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typedef struct acct acct_t;
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#endif
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#include <linux/jiffies.h>
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/*
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* Yet another set of HZ to *HZ helper functions.
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* See <linux/jiffies.h> for the original.
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*/
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static inline u32 jiffies_to_AHZ(unsigned long x)
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{
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#if (TICK_NSEC % (NSEC_PER_SEC / AHZ)) == 0
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# if HZ < AHZ
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return x * (AHZ / HZ);
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# else
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return x / (HZ / AHZ);
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# endif
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#else
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u64 tmp = (u64)x * TICK_NSEC;
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do_div(tmp, (NSEC_PER_SEC / AHZ));
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return (long)tmp;
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#endif
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}
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static inline u64 nsec_to_AHZ(u64 x)
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{
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#if (NSEC_PER_SEC % AHZ) == 0
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do_div(x, (NSEC_PER_SEC / AHZ));
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#elif (AHZ % 512) == 0
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x *= AHZ/512;
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do_div(x, (NSEC_PER_SEC / 512));
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#else
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/*
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* max relative error 5.7e-8 (1.8s per year) for AHZ <= 1024,
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* overflow after 64.99 years.
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* exact for AHZ=60, 72, 90, 120, 144, 180, 300, 600, 900, ...
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*/
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x *= 9;
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do_div(x, (unsigned long)((9ull * NSEC_PER_SEC + (AHZ/2))
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/ AHZ));
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#endif
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return x;
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}
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#endif /* _LINUX_ACCT_H */
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