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yaml --- r: 222892 b: refs/heads/master c: df9d38e h: refs/heads/master v: v3
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Linus Torvalds
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Dec 3, 2010
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--- | ||
refs/heads/master: a9fc749224bfb69686322643678f89e00303ee21 | ||
refs/heads/master: df9d38ebda762e54ed0b142c2c47b2f57a145ab2 |
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What: /sys/bus/rbd/ | ||
Date: November 2010 | ||
Contact: Yehuda Sadeh <yehuda@hq.newdream.net>, | ||
Sage Weil <sage@newdream.net> | ||
Description: | ||
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Being used for adding and removing rbd block devices. | ||
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Usage: <mon ip addr> <options> <pool name> <rbd image name> [snap name] | ||
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$ echo "192.168.0.1 name=admin rbd foo" > /sys/bus/rbd/add | ||
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The snapshot name can be "-" or omitted to map the image read/write. A <dev-id> | ||
will be assigned for any registered block device. If snapshot is used, it will | ||
be mapped read-only. | ||
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Removal of a device: | ||
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$ echo <dev-id> > /sys/bus/rbd/remove | ||
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Entries under /sys/bus/rbd/devices/<dev-id>/ | ||
-------------------------------------------- | ||
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client_id | ||
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The ceph unique client id that was assigned for this specific session. | ||
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major | ||
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The block device major number. | ||
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name | ||
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The name of the rbd image. | ||
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pool | ||
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The pool where this rbd image resides. The pool-name pair is unique | ||
per rados system. | ||
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size | ||
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The size (in bytes) of the mapped block device. | ||
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refresh | ||
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Writing to this file will reread the image header data and set | ||
all relevant datastructures accordingly. | ||
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current_snap | ||
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The current snapshot for which the device is mapped. | ||
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create_snap | ||
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Create a snapshot: | ||
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$ echo <snap-name> > /sys/bus/rbd/devices/<dev-id>/snap_create | ||
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rollback_snap | ||
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Rolls back data to the specified snapshot. This goes over the entire | ||
list of rados blocks and sends a rollback command to each. | ||
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$ echo <snap-name> > /sys/bus/rbd/devices/<dev-id>/snap_rollback | ||
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snap_* | ||
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A directory per each snapshot | ||
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Entries under /sys/bus/rbd/devices/<dev-id>/snap_<snap-name> | ||
------------------------------------------------------------- | ||
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id | ||
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The rados internal snapshot id assigned for this snapshot | ||
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size | ||
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The size of the image when this snapshot was taken. | ||
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/* Access to user system call parameters and results | ||
* | ||
* See asm-generic/syscall.h for function descriptions. | ||
* | ||
* Copyright (C) 2010 Red Hat, Inc. All Rights Reserved. | ||
* Written by David Howells (dhowells@redhat.com) | ||
* | ||
* This program is free software; you can redistribute it and/or | ||
* modify it under the terms of the GNU General Public Licence | ||
* as published by the Free Software Foundation; either version | ||
* 2 of the Licence, or (at your option) any later version. | ||
*/ | ||
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#ifndef _ASM_SYSCALL_H | ||
#define _ASM_SYSCALL_H | ||
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#include <linux/sched.h> | ||
#include <linux/err.h> | ||
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extern const unsigned long sys_call_table[]; | ||
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static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs) | ||
{ | ||
return regs->orig_d0; | ||
} | ||
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static inline void syscall_rollback(struct task_struct *task, | ||
struct pt_regs *regs) | ||
{ | ||
regs->d0 = regs->orig_d0; | ||
} | ||
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static inline long syscall_get_error(struct task_struct *task, | ||
struct pt_regs *regs) | ||
{ | ||
unsigned long error = regs->d0; | ||
return IS_ERR_VALUE(error) ? error : 0; | ||
} | ||
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static inline long syscall_get_return_value(struct task_struct *task, | ||
struct pt_regs *regs) | ||
{ | ||
return regs->d0; | ||
} | ||
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static inline void syscall_set_return_value(struct task_struct *task, | ||
struct pt_regs *regs, | ||
int error, long val) | ||
{ | ||
regs->d0 = (long) error ?: val; | ||
} | ||
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static inline void syscall_get_arguments(struct task_struct *task, | ||
struct pt_regs *regs, | ||
unsigned int i, unsigned int n, | ||
unsigned long *args) | ||
{ | ||
switch (i) { | ||
case 0: | ||
if (!n--) break; | ||
*args++ = regs->a0; | ||
case 1: | ||
if (!n--) break; | ||
*args++ = regs->d1; | ||
case 2: | ||
if (!n--) break; | ||
*args++ = regs->a3; | ||
case 3: | ||
if (!n--) break; | ||
*args++ = regs->a2; | ||
case 4: | ||
if (!n--) break; | ||
*args++ = regs->d3; | ||
case 5: | ||
if (!n--) break; | ||
*args++ = regs->d2; | ||
case 6: | ||
if (!n--) break; | ||
default: | ||
BUG(); | ||
break; | ||
} | ||
} | ||
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static inline void syscall_set_arguments(struct task_struct *task, | ||
struct pt_regs *regs, | ||
unsigned int i, unsigned int n, | ||
const unsigned long *args) | ||
{ | ||
switch (i) { | ||
case 0: | ||
if (!n--) break; | ||
regs->a0 = *args++; | ||
case 1: | ||
if (!n--) break; | ||
regs->d1 = *args++; | ||
case 2: | ||
if (!n--) break; | ||
regs->a3 = *args++; | ||
case 3: | ||
if (!n--) break; | ||
regs->a2 = *args++; | ||
case 4: | ||
if (!n--) break; | ||
regs->d3 = *args++; | ||
case 5: | ||
if (!n--) break; | ||
regs->d2 = *args++; | ||
case 6: | ||
if (!n--) break; | ||
default: | ||
BUG(); | ||
break; | ||
} | ||
} | ||
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#endif /* _ASM_SYSCALL_H */ |
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