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Yehuda Sadeh
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Sage Weil
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Dec 1, 2010
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--- | ||
refs/heads/master: 8520eeaa1235ee78d32558b6a57e02b236c9e588 | ||
refs/heads/master: dfc5606dc51381186de765243bab340c8e021868 |
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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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Clock framework on SuperH architecture | ||
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The framework on SH extends existing API by the function clk_set_rate_ex, | ||
which prototype is as follows: | ||
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clk_set_rate_ex (struct clk *clk, unsigned long rate, int algo_id) | ||
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The algo_id parameter is used to specify algorithm used to recalculate clocks, | ||
adjanced to clock, specified as first argument. It is assumed that algo_id==0 | ||
means no changes to adjanced clock | ||
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Internally, the clk_set_rate_ex forwards request to clk->ops->set_rate method, | ||
if it is present in ops structure. The method should set the clock rate and adjust | ||
all needed clocks according to the passed algo_id. | ||
Exact values for algo_id are machine-dependent. For the sh7722, the following | ||
values are defined: | ||
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NO_CHANGE = 0, | ||
IUS_N1_N1, /* I:U = N:1, U:Sh = N:1 */ | ||
IUS_322, /* I:U:Sh = 3:2:2 */ | ||
IUS_522, /* I:U:Sh = 5:2:2 */ | ||
IUS_N11, /* I:U:Sh = N:1:1 */ | ||
SB_N1, /* Sh:B = N:1 */ | ||
SB3_N1, /* Sh:B3 = N:1 */ | ||
SB3_32, /* Sh:B3 = 3:2 */ | ||
SB3_43, /* Sh:B3 = 4:3 */ | ||
SB3_54, /* Sh:B3 = 5:4 */ | ||
BP_N1, /* B:P = N:1 */ | ||
IP_N1 /* I:P = N:1 */ | ||
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Each of these constants means relation between clocks that can be set via the FRQCR | ||
register |
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